CN114524482B - Integrated device and method for removing oil and solids from process water of ethylene-propylene dehydrogenation device - Google Patents
Integrated device and method for removing oil and solids from process water of ethylene-propylene dehydrogenation device Download PDFInfo
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- CN114524482B CN114524482B CN202210084174.5A CN202210084174A CN114524482B CN 114524482 B CN114524482 B CN 114524482B CN 202210084174 A CN202210084174 A CN 202210084174A CN 114524482 B CN114524482 B CN 114524482B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention provides an oil removal and solidification integrated device and method for process water of an ethylene-propylene dehydrogenation device, comprising the following steps: the device comprises one or more serial opposite medium filtering modules, a water distribution plate, a boiling stopping baffle, an opposite medium filtering layer and a water filtering cap assembly, wherein the water distribution plate, the boiling stopping baffle, the opposite medium filtering layer and the water filtering cap assembly are sequentially arranged in the vertical tank from top to bottom, the water distribution plate is externally connected with a process water feeding port, and the particle size and the density of a filtering material of the opposite medium filtering layer are sequentially increased from top to bottom; the compact type combined integrated equipment comprises a self-adaptive rotational flow module, a woven fiber module and a gravity settlement strengthening module, wherein a sewage outlet of the foreign medium filtering module is connected to the compact type combined integrated equipment; and the dissolved air backwashing system is used for backwashing and regenerating the heterogeneous medium filtering module. The integrated device has excellent effect on coalescence and removal of solid-phase suspended solid particles, floating oil, dispersed and emulsified oil phases in incoming sewage, and has strong material fluctuation resistance.
Description
Technical Field
The invention belongs to the field of chemical environmental protection, and particularly relates to an oil removal and solid removal integrated device and method for process water of an ethylene-propylene dehydrogenation device, which realize efficient advanced treatment of oily sewage.
Background
The ethylene-propane dehydrogenation device comprises units of raw material pretreatment, cracking, separation and the like, and products such as ethylene, propylene, carbon tetraolefin, carbon pentaolefin, cracking aromatic hydrocarbon, ethylene tar, hydrogen and the like are obtained by decomposing the raw material through steam cracking, quenching, compression separation and the like. The quenching system is an important component of the ethylene unit, and directly connects two units of cracking and compression, and the operation quality of the quenching system has important influence on the performance of the ethylene unit, and is the key point of reconstruction and expansion of the ethylene unit. The production process of the quenching water system can produce quenching water and process water, generally adopts an ethylene device of a cracking furnace steam cracking process, diluted steam in cracking gas is condensed into water in a quenching water tower, because the preface flow of the quenching water tower is a gasoline fractionating tower, steam condensate water and heavy gasoline are cooled down by the quenching water tower through washing, partial materials on the tower bottom liquid are sent to an oil-water separation settling tank to be separated and removed to obtain process water after passing through a baffle, and the process water belongs to typical w/o emulsion, and has a relatively stable system and can not be separated by a simple mechanical means because the particle size is smaller (0.1 mu m-10 mu m).
In order to realize demulsification and separation of emulsified oily sewage, chemical agents are mainly added to demulsify and then external energy fields (such as electricity, heat, magnetic fields, electric fields and the like) are applied to accelerate the destabilization demulsification degree of the oily sewage, so that coalescence, growth and completion of separation of oil phases are promoted. The method has the problems of large dosage consumption, poor oil phase recoverability, secondary pollution and the like, and the application range of the medicament is smaller because the medicament is selected according to the water quality change; the device for applying the external energy field is complex, low in efficiency, high in energy consumption, high in daily maintenance cost and difficult to popularize. By utilizing the wettability of the coalescing medium to the oil phase, a liquid film between the oil phase and the water phase can be broken, demulsification is accelerated, and the coalescence growth of the oil phase is promoted to complete separation. Such techniques suffer from insufficient separation depth due to the limitations of viscous bypass of the aqueous fluid.
Patent CN202022444045.1 discloses a high-efficient integrated oily sewage treatment system, which can realize the treatment of oily sewage through the components of a cyclone oil remover, a plasma sewage purifier, a metal film purifier and the like. When passing through the plasma sewage purifier, the organic molecules are pyrolyzed at high temperature or subjected to advanced oxidation under the action of free radicals to realize oil removal by chemical degradation, and the process has high energy consumption and high treatment cost, and does not meet the requirement of economy.
Patent CN202010447513.2 discloses a coalescing oil remover for treating oilfield sewage, which increases the cross-sectional area of water flow channels between adjacent corrugated plates by thinning the thickness of corrugated plates in the prior art, thereby greatly improving the sewage treatment capacity; and under the premise that the sewage treatment efficiency is not reduced, namely under the condition that the cross section of the water flow channel is kept unchanged, the arrangement quantity of the corrugated plates is greatly increased, so that the contact area of the corrugated plates and sewage is increased, and the oil gathering efficiency and effect are improved. The device has the advantages that the pressure drop is easy to rise due to the fact that the device is too many and single coalescing media, the treatment efficiency is low, and the requirement of efficient production is not met.
Therefore, the development of a method and a device capable of realizing deep demulsification and oil-water efficient separation on emulsified oily sewage and simultaneously guaranteeing low operation pressure drop and maintenance cost is urgently needed in the field.
Disclosure of Invention
Aiming at the problems of poor demulsification effect, low treatment efficiency and short operation period of a single physical method, the invention provides a method and a device for integrating oil removal and fixation of process water of an ethylene-propylene dehydrogenation device.
The technical scheme of the invention is as follows: an oil removal and solidification integrated device for process water of an ethylene-propylene dehydrogenation device, comprising: the system comprises one or more serial opposite medium filtering modules, a water distribution plate, a boiling stopping baffle, an opposite medium filtering layer and a water filtering cap assembly, wherein the opposite medium filtering modules comprise a vertical tank body, a first oil drain port and a first sewage drain port which are respectively arranged at the top and the bottom of the vertical tank body, and a water distribution plate, a boiling stopping baffle, an opposite medium filtering layer and a water filtering cap assembly which are sequentially arranged in the vertical tank body from top to bottom, the water distribution plate is externally connected with a process water feeding port, and the particle size and the density of a filtering material of the opposite medium filtering layer are sequentially increased from top to bottom;
the compact combined integrated device comprises a self-adaptive rotational flow module, a woven fiber module and a gravity settlement strengthening module, wherein a first sewage outlet of the anisotropic medium filtering module is connected to the compact combined integrated device;
the dissolved air water backwashing system is used for backwashing and regenerating the heterogeneous medium filtering module and comprises a dissolved air pump, a dissolved air water buffer tank, a circulating pump and a parting bubble generator, wherein the circulating pump is arranged between the dissolved air water buffer tank and the parting bubble generator.
Further, the heterogeneous medium filter material layer comprises three layers of filter materials, wherein the upper layer of filter material is made of polymer particle materials or soft filling materials with lighter materialsThe material has the filter material particle size of 0.3-1.5 mm and the density of 1.2-2.0 g/cm 2 The bed thickness is 0.2-0.3 m; the middle layer filter material is made of inorganic particle material, the particle size of the filter material is 1.5-2.4 mm, and the medium density is 1.8-3.1 g/cm 2 The bed thickness is 0.2-0.3 m; the material of the lower filter material is heavy large-size particles, the particle size of the filter material is 3-5 mm, and the density of the medium is 2.6-5.2 g/cm 2 The bed thickness is 0.2-0.3 m.
Further, the diameter size of the water diversion disc is 0.5-0.75 times of the diameter of the vertical tank body, and the distance between the water diversion disc and the tangent line at the upper part of the vertical tank body is 0.1-0.2 m; the distance between the boiling stop baffle and the opposite medium filter material layer is 0.2-0.25 times of the height of the opposite medium filter material layer.
The boiling stopping baffle plate can be a sieve mesh disc plate, a grating plate and the like, the sieve mesh disc plate can be composed of a pair of sieve mesh semicircular plates, the outer side end of each sieve mesh semicircular plate is respectively and rotatably connected to the side wall of the vertical tank body, and a horizontal baffle piece is horizontally arranged on the inner side wall of the vertical tank body so as to limit the rotation angle of the sieve mesh semicircular plate to be less than or equal to 90 degrees.
Further, the compact module combination integrated equipment comprises a horizontal tank body, a water inlet and an oil discharging bag are arranged at two ends of the top of the horizontal tank body, a liquid level meter is arranged on the side edge of the oil discharging bag, a second oil discharging port is arranged at the top of the oil discharging bag, the oil discharging bag is arranged at the second sewage outlet at the bottom of the horizontal tank body, the self-adaptive rotational flow module, the woven fiber module and the gravity strengthening sedimentation module are sequentially arranged in the horizontal tank body along the liquid flowing direction, the water inlet of the horizontal tank body is connected with the first sewage outlet, and process sewage treated by the compact module combination integrated equipment is discharged through the second sewage outlet.
Further, the self-adaptive rotational flow module comprises 2-3 self-adaptive rotational flow multiphase separation devices which are connected in parallel, the gravity-enhanced sedimentation module comprises at least two corrugated plates, and the corrugated plates are tightly attached to the outer side ends of the woven fiber modules; the water inlet of the self-adaptive rotational flow multiphase separation equipment is connected with the water inlet of the horizontal tank body, the water phase separated by the self-adaptive rotational flow multiphase separation equipment enters the woven fiber module, and the oil phase enters the oil drainage bag.
The self-adaptive rotational flow multiphase separation equipment comprises a main separation pipe, an auxiliary separation pipe and a main and auxiliary pipeline communicating pipe which is communicated with the main separation pipe and the auxiliary separation pipe, wherein 2-4 auxiliary centrifugal pipes are uniformly distributed around 1 main centrifugal pipe; the bottom of the main centrifugal tube is provided with a swirl vane, the top of the main centrifugal tube is provided with a light phase diversion cone and a scour prevention cap, the side wall of the main centrifugal tube is provided with at least two tangential liquid outlets, and the swirl vane can change the flowing state of liquid flowing through the swirl vane from axial movement to rotary movement; the bottom of the auxiliary separating pipe is provided with a heavy phase separating cone, the top of the auxiliary separating pipe is provided with a light phase separating cone and an anti-collision cap, and the light phase guiding cones of the main separating pipe and the auxiliary separating pipe are communicated with the oil pocket.
Further, the self-adaptive rotational flow module is arranged in such a way that the ratio of the inner diameter of the auxiliary separation cavity to the inner diameter of the main separation cavity is 0.3-0.8, the ratio of the height of the auxiliary separation cavity to the inner diameter of the main separation cavity is 0.1-0.4, the length of the main and auxiliary pipeline communicating pipe is 0.3-0.6 times of the inner diameter of the inner cavity of the main separation pipe, and the inclined included angle of the light phase diversion cone is 15-60 degrees; the ratio of the centrifugal acceleration of the liquid in the auxiliary centrifugal tube to the centrifugal acceleration of the liquid in the main centrifugal tube is (6-80): 1.
further, the woven fiber module comprises at least two fiber coalescing beds, each fiber coalescing bed comprises a cylinder seat and mixed woven fibers coated on the cylinder seat, the outer diameter of the cylinder seat is 0.85-0.95 times of the inner diameter of the horizontal tank body, and the length of the cylinder seat is 0.2-0.25 times of the length of the horizontal tank body;
the mixed braiding fiber is formed by mixed braiding of hydrophilic oleophobic fiber and hydrophilic hydrophobic stainless steel wires, wherein the diameter of the hydrophilic oleophobic fiber is 10-25 mu m, the diameter of the hydrophilic hydrophobic stainless steel wires is 220-250 mu m, and the volume of the stainless steel wires in the whole bed layer is 8-10%.
Further, the top of the dissolved air buffer tank is provided with a back washing gas-liquid inlet, and the side wall is provided with a gas inlet, a back washing water inlet and a dissolved air water outlet; the air dissolving pump is communicated with the backwash water inlet and the air inlet, the parting bubble generator is arranged below the water filtering cap assembly in the vertical tank body, the bottom and the top of the vertical tank body are respectively provided with an air dissolving water inlet, the air dissolving water outlet is communicated with the air dissolving water inlet through the circulating pump, and air dissolving water enters the vertical tank body and then forms uniform bubbles through the parting bubble generator; the top of the vertical tank body is provided with a backwash gas-liquid outlet communicated with the backwash gas-liquid inlet, and the top of the vertical tank body below the backwash gas-liquid outlet is provided with a material leakage preventing module.
The invention also provides a method for integrating degreasing, removing and solidifying of the process water of the ethylene-propylene dehydrogenation device, which adopts the degreasing, removing and solidifying integrated device and comprises the following steps:
(1) The incoming sewage enters the opposite medium filtering module through a process water feed inlet, enters the opposite medium filtering layer after being rectified by the water diversion disk, and is captured and coalesced by oil drops of the opposite medium filtering layer, and after the suspended matters are intercepted and separated, the preliminary treatment of the oil drops and the suspended matters is realized;
(2) The sewage subjected to preliminary oil removal and solid removal treatment by the foreign medium filtering module enters the compact module combination integrated equipment through the first sewage outlet, and the deep removal of oil drops is realized under the actions of the self-adaptive rotational flow module, the woven fiber module and the gravity-enhanced sedimentation module in sequence.
Further, after the oil removal and solid removal process is carried out on the incoming sewage, the air-dissolved water backwashing system is used for backwashing and regenerating the heterogeneous medium filter material layer, and the method comprises the following steps:
(1) And nitrogen is injected into the anisotropic medium filtering module, and after the nitrogen is uniformly distributed in the water filtering cap assembly, the anisotropic medium filtering layer is puffed.
(2) Opening a backwash water inlet, sucking backwash clear water and nitrogen into a dissolved air water buffer tank under the negative pressure action of a dissolved air pump, and removing bubbles which are difficult to dissolve in water under the sedimentation action of the dissolved air water buffer tank;
(3) Injecting the dissolved air water in the step (2) into the bottom of the vertical tank body, wherein the dissolved air water generates fractal bubbles with different sizes and uniform forms through the parting bubble generator, and the fractal bubbles are distributed through the water filtering cap assembly and then perform preliminary backwashing on the heterogeneous medium filtering material layer;
(4) And stopping injecting nitrogen, only injecting backwash clear water, stabilizing the bed of the anisotropic medium filter material layer, and recovering the normal working state of the equipment.
Further, Q is normal operation flow, the backflushing air quantity of the expanded bed layer in the step (1) of the backflushing process is 1Q-6Q, and the air inlet expansion time is 20-30 min; the flow of the backwashing clear water in the step (2) is 1Q-5Q, the flow of the backwashing nitrogen is 1Q-6Q, and the time of the combined backwashing of air and water is 20-60 min; the water inflow of the stable bed is 0.5-2Q, and the time for stabilizing the bed is 15-25 min.
The invention has the following beneficial results:
(1) The equipment provided by the invention is a large-size channel, has no flowing dead zone, prevents accumulation of suspended matters of incoming materials, can flexibly adjust operation parameters according to actual conditions of the incoming materials, is optimized, has excellent effects on coalescence and removal of solid-phase suspended matters particles, floating oil, dispersed oil phase and emulsified oil phase in incoming material sewage by matching with the use of a heterogeneous medium filtering module and compact combined integrated equipment, has strong material fluctuation resistance, large operation elasticity and long continuous operation period, and overcomes the defects of an industrial device on oil removal and solid removal integrated treatment technology.
(2) Compared with the traditional equipment which relies on single physical methods such as chemical agent emulsion breaking, air floatation, rotational flow and the like in the prior art, the invention has the advantages of compact structure, small occupied area, no use of chemical agent, small environmental pollution, integrated recovery of dirty oil resources and great significance in improving the carbon neutralization level in the oil refining and chemical industry.
Drawings
FIG. 1 is a flow chart of an integrated device and method for removing oil and solids from process water of an ethylene-propylene dehydrogenation device.
Fig. 2 is a schematic diagram of a heterogeneous media filtration module.
Fig. 3 is a schematic view of a compact modular integrated device.
Fig. 4 is a schematic structural diagram of an adaptive cyclone multiphase separation device.
FIG. 5 is a schematic diagram of a combined process flow in an embodiment in which the anisotropic media filter module primarily shows the media filter layer.
Wherein: 1. 1-1 parts of opposite medium filtering modules, 1-2 parts of vertical tank bodies, 1-3 parts of first oil drain ports, 1-4 parts of first sewage drain ports, 1-5 parts of water distributing discs, 1-6 parts of opposite medium filtering layers, 1-7 parts of water filtering cap assemblies, 1-8 parts of boiling stopping baffles, 1-9 parts of dissolved air water inlets, 1-9 parts of backwashing air-liquid outlets, 1-10 parts of anti-material-leakage modules, 1-11 parts of viewing mirrors, 1-12 parts of material inlets and outlets;
2. 2-1 parts of compact combined integrated equipment, 2-2 parts of horizontal tank bodies, 2-2 parts of water inlets, 2-3 parts of oil discharge bags, 2-4 parts of second oil discharge ports, 2-5 parts of second sewage outlets, 2-6 parts of self-adaptive cyclone modules, 2-6-1 parts of main separation pipes, 2-6-2 parts of auxiliary separation pipes, 2-6-3 parts of main and auxiliary pipeline communicating pipes, 2-7 parts of woven fiber modules, 2-8 parts of reinforced gravity sedimentation modules;
3. 3-1 parts of dissolved air backwashing system, 3-2 parts of dissolved air pump, 3-3 parts of dissolved air buffer tank, 3-3 parts of circulating pump, 3-4 parts of parting bubble generator, 3-5 parts of backwashing gas-liquid inlet, 3-6 parts of air inlet, 3-7 parts of backwash water inlet, 3-8 parts of dissolved air water outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, this embodiment provides an integral device for removing oil and solids from process water of an ethylene-propylene dehydrogenation device, which includes:
the device comprises one or more opposite medium filtering modules 1, a vertical tank body 1-1, a first oil drain port 1-2 and a first sewage drain port 1-3 which are respectively arranged at the top and the bottom of the vertical tank body 1-1, and a water distributing disc 1-4, a boiling stopping baffle 1-7, an opposite medium filtering material layer 1-5 and a water filtering cap component 1-6 which are sequentially arranged in the vertical tank body 1-1 from top to bottom, wherein the opposite medium filtering modules 1 are used for removing oil drops with the particle size of more than 10 mu m and suspended matters to realize pretreatment of incoming materials of process water; the water distribution disc 1-4 is externally connected with a process water feed inlet, the anisotropic medium filter material layers 1-5 are single-layer or multi-layer filter materials made of different materials, and the particle size and the density of the filter materials are sequentially increased from top to bottom;
the compact combined integrated equipment 2 is used for further treating sewage treated by the heterogeneous medium filtering module 1 to remove oil drops with the particle size of 3-10 mu m, and comprises a horizontal tank body 2-1, a water inlet 2-2 and an oil discharging bag 2-3, wherein the water inlet 2-2 and the oil discharging bag 2-3 are arranged at two ends of the top of the horizontal tank body 2-1, a liquid level meter (not shown in the figure) is arranged on the side edge of the oil discharging bag 2-3 and used for detecting an oil-water boundary, a second oil outlet 2-4 is arranged at the top of the oil discharging bag 2-3, a second drain outlet 2-5 is arranged at the bottom of the horizontal tank body 2-1 relative to the oil discharging bag 2-3, and an adaptive cyclone module 2-6, a woven fiber module 2-7 and a reinforced gravity sedimentation module 2-8 are sequentially arranged in the horizontal tank body 2-1 along the liquid flow direction, and the water inlet 2-2 of the horizontal tank body 2-1 is connected with the first drain outlet 1-3 of the vertical tank body 1-1, and the process water treated by the compact combined integrated equipment 2-is discharged from the second drain outlet 2-5 of the horizontal tank body 2-1.
And the dissolved air backwashing system 3 is used for backwashing and regenerating the opposite medium filter material layers 1-5 of the opposite medium filter module 1.
According to the invention, the dissolved air backwashing system 3 comprises a dissolved air pump 3-1, a dissolved air buffer tank 3-2, a circulating pump 3-3 and a parting bubble generator 3-4, wherein a backwashing air liquid inlet 3-5 is formed in the top of the dissolved air buffer tank 3-2, and an air inlet 3-6, a backwashing water inlet 3-7 and a dissolved air water outlet 3-8 are formed in the side wall of the dissolved air buffer tank, wherein:
the dissolved air pump 3-1 is communicated with the backwash water inlet 3-7 and the air inlet 3-6 of the dissolved air water buffer tank 3-2, the parting bubble generator 3-4 is arranged below the water filtering cap assembly 1-6 in the vertical tank body 1-1, the dissolved air water inlet 1-8 is arranged at the bottom of the vertical tank body 1-1, the dissolved air water outlet 3-8 is communicated with the dissolved air water inlet 1-8 through the circulating pump 3-3, and the dissolved air water enters the vertical tank body 1-1 and then generates bubbles with uniform forms through the parting bubble generator 3-4;
the top of the vertical tank body 1-1 is provided with a backwash gas-liquid outlet 1-9 communicated with a backwash gas-liquid inlet 3-5, and the top of the vertical tank body 1-1 below the backwash gas-liquid outlet 1-9 is also provided with an anti-running module 1-10 so as to prevent small particle media from flowing out of the vertical tank body 1-1 along with backwash liquid. The backwashing gas-liquid outlet 1-9 is communicated with the backwashing gas-liquid inlet 3-5 so as to realize cyclic backwashing; the dissolved air water buffer tank 3-2 ensures that the flow of backwash water entering the opposite medium filter module 1 is stable, and the air content is uniform, so that a better backwash effect is obtained.
Further, the heterogeneous medium filter material layers 1-5 comprise three layers of filter materials, wherein the materials of the upper layer of filter materials comprise polymer particle materials such as polytetrafluoroethylene and the like or soft fillers with lighter materials such as anthracite and the like, the particle size of the filter materials is 0.3-1.5 mm, and the medium density is 1.2-2.0 g/cm 2 The bed thickness is 0.2-0.3 m, and the function of coalescence and separation of oil drops and filtration of suspended matters is mainly used; the middle layer filter material comprises inorganic particle materials such as walnut shell, quartz sand, coal activated carbon and the like, the particle size of the filter material is 1.5-2.4 mm, and the medium density is 1.8-3.1 g/cm 2 The thickness of the bed layer is 0.2-0.3 m, and the layer mainly takes the depth adsorption interception of suspended particles as the main part; the material of the lower filter material comprises heavy large-size particles such as serpentine, cobblestone and the like, the particle size of the filter material is 3-5 mm, and the medium density is 2.6-5.2 g/cm 2 The thickness of the bed layer is 0.2-0.3 m, and the layer mainly plays a role of supporting the upper filter material layer.
Further, the diameter size of the water distribution disc 1-4 is 1/2-3/4 d, wherein d is the diameter of the vertical tank body 1-1, and the section flow rate of the filled heterogeneous medium corresponding to d is 0.001-0.02 m/s; the distance between the water distribution plate 1-4 and the tangent line at the upper part of the vertical tank body 1-1 is 0.1-0.2 m. In this embodiment, the water distribution tray 1-4 is made of polyvinyl chloride, and may be in a shape of a mesh tray, and the water distribution tray 1-4 makes the incoming sewage uniformly distributed at the radial position in the vertical tank 1-1.
Further, the distance between the boiling stop baffle plate 1-7 and the opposite medium filter material layer 1-5 is 0.2-0.25 times of the height of the opposite medium filter material layer 1-5, and the boiling stop baffle plate 1-7 is used for limiting the movement position of the filter material when the backwashing program is carried out.
Further, the boiling stop baffle plates 1-7 may be mesh circular plates or mesh circular plates composed of a pair of mesh semicircular plates. When the boiling stopping baffle is a sieve pore disc, two ends of the sieve pore disc are fixed on the side wall of the vertical tank body 1-1 through fixing pieces; when the boiling stopping baffle is a sieve pore circular plate formed by a pair of sieve pore semicircular plates, the outer side end of each sieve pore semicircular plate is respectively and rotatably connected to the side wall of the vertical tank body, and the inner side wall of the vertical tank body is horizontally provided with a horizontal baffle piece so as to limit the rotation angle of the sieve pore semicircular plate to be less than or equal to 90 degrees. Under normal state, the sieve mesh semicircle board is naturally sagged vertically to be located in the vertical jar body, when the opposite medium filter material layer is expanded, under the pressure of opposite medium filter material layer, the inboard end level of sieve mesh semicircle board is the horizontality upwards upset to the motion position of restriction filter material.
Further, the water filtering cap assembly 1-6 comprises 5-8 water filtering caps which are uniformly distributed below the heterogeneous medium filtering material layer 1-5 and are used for filtering impurities in sewage and preventing heterogeneous medium in the tank from escaping. The water filtering cap is made of 304 stainless steel, and the shape of the water filtering cap comprises a tower tip shape, a cylindrical lamination shape and a plum blossom shape.
3-5 sight glass 1-11 are arranged on the outer side wall of the vertical tank body 1-1 from top to bottom and are used for observing the oil-water boundary position above so as to drain oil timely; the middle part of the vertical tank body 1-1 is provided with a material inlet and outlet 1-12 for replacing the filler in the tank after the long-time operation treatment capacity is reduced.
As shown in fig. 3 and 4, in this embodiment, the adaptive cyclone module 2-6 includes 2 parallel adaptive cyclone multiphase separation devices, which rapidly degas and remove oil from dispersed oil drops by using centrifugal force. The self-adaptive rotational flow multiphase separation equipment can adopt related structural design in a self-adaptive multiphase integrated separation device and method of China patent CN112387013A, and comprises a main separation pipe 2-6-1, an auxiliary separation pipe 2-6-2 and a main and auxiliary pipeline communicating pipe 2-6-3 which are communicated with the main separation pipe 2-6-1, 2-4 auxiliary separation pipes 2-6-2 are uniformly distributed around the main separation pipe 2-6-1, a heavy phase separation cone is arranged at the bottom of the auxiliary separation pipe 2-6-2, and a light phase separation cone and a shock-proof cap are arranged at the top of the auxiliary separation pipe. The water inlet of the self-adaptive rotational flow multiphase separation equipment is connected with the water inlet 2-2 of the horizontal tank body 2-1, the light phase diversion cones of the main separation pipe 2-6-2 are communicated with the oil discharge bag 2-3, the water phase separated by the self-adaptive rotational flow multiphase separation equipment enters the woven fiber module 2-7, and the oil phase is discharged through the oil discharge bag 2-3.
Further, the woven fiber module 2-7 comprises at least two fiber coalescing beds, each fiber coalescing bed comprises a cylindrical seat and mixed woven fibers coated on the cylindrical seat, the outer diameter of the cylindrical seat is 0.85-0.95 times of the inner diameter of the horizontal tank 2-1, and the length of the cylindrical seat is 0.2-0.25 times of the length of the horizontal tank 2-1; the mixed braiding fiber is formed by mixed braiding of hydrophilic oleophobic fiber and hydrophilic hydrophobic stainless steel wires, wherein the diameter of the hydrophilic oleophobic fiber is 10-25 mu m, the diameter of the hydrophilic hydrophobic stainless steel wires is 220-250 mu m, and the volume of the stainless steel wires in the integral fiber coalescing bed layer is 8-10%.
Further, the gravity-reinforced sedimentation module 2-8 comprises 2 or more corrugated plates, and is tightly attached to the outer side end of the woven fiber module 2-7. In the embodiment, the corrugated plate is composed of 60% of polytetrafluoroethylene and 40% of Monel alloy, and small holes with the radius of 4mm are uniformly distributed on the surface of the corrugated plate; the gravity-enhanced sedimentation module 2-8 is used for accelerating sedimentation separation of larger oil drops released by the woven fiber module 2-7 so as to reduce the sedimentation space of the equipment.
It should be noted that, the oil discharging mode of the oil discharging ports of the devices in the invention can be intermittent discharging mode or continuous discharging mode, and when the oil discharging mode is continuous discharging mode, the oil phase flow of the oil discharging ports is 0.3% -0.5% of the tank body treatment capacity.
The invention also provides a method for carrying out oil removal and solid removal integration on the process water of the ethylene-propylene dehydrogenation device by using the device, which comprises the following steps:
(1) The incoming sewage enters the opposite medium filtering module 1 through a process water feed inlet, is rectified by the water distributing disc 1-4, enters the opposite medium filtering material layer 1-5, is captured and coalesced by oil drops of the opposite medium filtering material layer 1-5, and realizes preliminary treatment of the oil drops and suspended matters after the suspended matters intercept and separate actions;
(2) The sewage subjected to preliminary oil removal and solid removal treatment by the foreign medium filtering module 1 enters the compact module combination integrated equipment 2 through the first sewage outlet 1-3, and the deep removal of oil drops is realized under the actions of the self-adaptive rotational flow module 2-6, the woven fiber module 2-7 and the reinforced gravity sedimentation module 2-8 in sequence.
After the oil removal and solid removal integrated device is used for treatment, the oil content in the water discharged from the second sewage outlet 2-5 is not higher than 30ppm, and the suspended matter content is not higher than 10ppm.
In order to realize the repeated use of the heterogeneous medium filter material layers 1-5, after the oil and solid removal process of the incoming sewage is finished, the heterogeneous medium filter material layers 1-5 are backwashed and regenerated by using the dissolved air and water backwashing system 3, and the method comprises the following steps:
(1) A nitrogen inlet is opened, nitrogen is injected into the anisotropic medium filter module 1 through the dissolved air water inlet 1-8, and after the nitrogen is uniformly distributed through the water filtering cap assembly 1-6, the anisotropic medium filter material layer 1-5 is puffed;
(2) Opening a backwash water inlet 3-7, sucking backwash clear water and nitrogen into a buffer tank under the negative pressure action of a dissolved air pump 3-1, and removing bubbles which are difficult to dissolve in water under the natural sedimentation action of the buffer tank;
(3) Injecting dissolved air water for removing large bubbles into the bottom of the vertical tank body 1-1 through an dissolved air water inlet 1-8, enabling the dissolved air water to generate fractal bubbles with different sizes and uniform shapes through a parting bubble generator 3-4, and performing preliminary backwashing on the opposite medium filter material layer 1-5 after the dissolved air water is distributed through the filter caps;
(4) And stopping backwashing nitrogen, only injecting backwashing clear water, stabilizing the beds of the anisotropic medium filter material layers 1-5, and recovering the normal working state of the equipment.
Further, Q is normal operation flow, the backflushing air quantity of the expanded bed layer in the step 1 of the backflushing regeneration flow is 1Q-6Q, and the air inlet expansion time is 20-30 min; the flow of the backwashing clear water in the step 2 is 1Q-5Q, the flow of the backwashing nitrogen is 1Q-6Q, and the time of the combined backwashing of air and water is 20-60 min; the water inflow of the stable bed is 0.5Q-2Q, and the time for stabilizing the bed is 15-25 min.
The oil removal and solid removal integrated device is adopted by a certain Ningbo company to treat sewage, and the specific conditions are as follows: quench water and process water can be generated in the production process of a quench water system in an ethylene production device of the company, the process water is emulsified to cause difficult oil-water separation, and even the device is stopped when serious. The oil content in the process water is high and the fluctuation is large, and is often up to more than 1500 mg/L; the appearance is in a milky and turbid state, and the turbidity is out of range. According to detection, the oil in the process water is mainly petroleum, alkane, naphthene and aromatic hydrocarbon account for 95% of the total amount, and in order to reduce adverse effects caused by sewage, the oil content of the discharged sewage is generally required to be less than 100mg/L.
The device adopted in the process water treatment is shown in fig. 5, three-stage treatment is adopted, the first stage and the second stage are different-medium filtering modules 1, and the structural parameters are as follows: the height of the vertical tank body 1-1 is 2.4m, the diameter is 0.8m, the thickness of the opposite medium filter layer 1-5 is 0.75m, polytetrafluoroethylene granular materials, quartz sand granular materials and goose warm stone granules are sequentially selected from top to bottom, and the thickness of each medium layer is set to be 0.25m. The three stages adopt compact type combined integrated equipment 2, and the structural parameters are as follows: the inner diameter of the horizontal tank body 2-1 is 0.6m, the length is 2m, the self-adaptive rotational flow module 2-6 adopts two parallel self-adaptive rotational flow multiphase separation devices, the gravity-enhanced sedimentation module 2-8 is tightly attached to the rear of the woven fiber module 2-7 and comprises 4 layers of corrugated plates, the corrugated plates are composed of 60% of polytetrafluoroethylene and 40% of Monel alloy, small holes with the radius of 4mm are uniformly distributed on the surfaces of the corrugated plates, and oil drops conveniently float upwards to pass through after coalescence.
The dilution steam in the ethylene production device of the company is condensed into water from the cooling effect of the upper-level quenching water tower, the heavy gasoline is removed by an oil-water separation tank to generate process water, the process water is sent to the device, and the incoming material flow is regulated to be 1.2m through an inlet valve and a water outlet valve 3 And/h, processing the process water sequentially through two opposite medium filtering modules 1 and a compact module combination integrated device 2 which are connected in series, and recording the oil content of the water sample at the primary outlet, the secondary outlet and the tertiary outlet. The oil content of the primary outlet sample is 324.26mg/L, the oil content of the inlet sample is 698.75mg/L as a reference, and the separation efficiency is 53.59%; the oil content of the secondary outlet is 195.34mg/L, and the separation efficiency is 39.75% by taking the oil content of the primary outlet as a reference; the inlet oil content is taken as a reference, and the separation efficiency is 72.04%; the oil content of the third-stage outlet is 77.68mg/L, and the separation efficiency is 76.04% by taking the oil content of the first-stage outlet as a reference; the separation efficiency was 88.89% with reference to the inlet oil content. Meanwhile, the change of the turbidity of the outlet water sample of each stage of equipment is recorded, the inlet water sample is highly emulsified, the turbidity exceeds the measuring range, the turbidity of the first-stage outlet sample is 35NTU, the turbidity of the second-stage outlet sample is 25NTU, the reduction rate is 28.57 percent by taking the turbidity of the first-stage outlet as a reference, the oil content of the third-stage outlet is 8.63NTU, the turbidity of the first-stage outlet as a reference, the separation efficiency is 75.34 percent by taking the turbidity of the second-stage outlet as a reference, and the separation efficiency is 65.48 percent.
The device can remove floating oil, emulsified oil and scum in the imported process water, the oil content of the treated sewage can be as low as 77.68mg/L, the turbidity is reduced to 8.63NTU, and the treated water sample shows a transparent state and is clearly compared with the water sample of the feed inlet of the process water, so that the expected target is achieved.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The utility model provides an deoiling of ethylene propane dehydrogenation unit process water takes off solid integrated device which characterized in that includes:
the system comprises one or more serial opposite medium filtering modules, a water distribution plate, a boiling stopping baffle, an opposite medium filtering layer and a water filtering cap assembly, wherein the opposite medium filtering modules comprise a vertical tank body, a first oil drain port and a first sewage drain port which are respectively arranged at the top and the bottom of the vertical tank body, and a water distribution plate, the boiling stopping baffle, the opposite medium filtering layer and the water filtering cap assembly which are sequentially arranged in the vertical tank body from top to bottom, the water distribution plate is externally connected with a process water feed port, and the particle size and the density of a filtering material of the opposite medium filtering layer are sequentially increased from top to bottom;
the compact combined integrated device comprises a self-adaptive rotational flow module, a woven fiber module and a gravity settlement strengthening module, wherein a first sewage outlet of the anisotropic medium filtering module is connected to the compact combined integrated device;
the dissolved air water backwashing system is used for backwashing and regenerating the heterogeneous medium filtering module and comprises a dissolved air pump, a dissolved air water buffer tank, a circulating pump and a parting bubble generator, wherein the circulating pump is arranged between the dissolved air water buffer tank and the parting bubble generator;
the compact module combination integrated equipment comprises a horizontal tank body, a water inlet and an oil discharge bag, wherein the water inlet and the oil discharge bag are arranged at two ends of the top of the horizontal tank body, the self-adaptive rotational flow module, the woven fiber module and the gravity-reinforced sedimentation module are sequentially arranged in the horizontal tank body along the liquid flowing direction, the water phase separated by the self-adaptive rotational flow multiphase separation equipment enters the woven fiber module, and the oil phase enters the oil discharge bag; the woven fiber module comprises at least two fiber coalescing beds, each fiber coalescing bed comprises a cylindrical seat and mixed woven fibers coated on the cylindrical seat, the outer diameter of the cylindrical seat is 0.85-0.95 times of the inner diameter of the horizontal tank body, and the length of the cylindrical seat is 0.2-0.25 times of the length of the horizontal tank body; the mixed braiding fiber is formed by mixed braiding of hydrophilic oleophobic fiber and hydrophilic hydrophobic stainless steel wires, wherein the diameter of the hydrophilic oleophobic fiber is 10-25 mu m, the diameter of the hydrophilic hydrophobic stainless steel wires is 220-250 mu m, and the volume of the stainless steel wires in the integral bed layer is 8-10%;
the top of the dissolved air water buffer tank is provided with a back washing gas-liquid inlet, and the side wall of the dissolved air water buffer tank is provided with a gas inlet, a back washing water inlet and a dissolved air water outlet; the top of the vertical tank body is provided with a backwash gas-liquid outlet communicated with the backwash gas-liquid inlet, the bottom of the vertical tank body is provided with a dissolved gas-water inlet communicated with the dissolved gas-water outlet, and dissolved gas water enters the vertical tank body and passes through the parting bubble generator to generate fractal bubbles with different sizes and uniform forms.
2. The integrated device for removing oil and solids from process water of an ethylene-propylene dehydrogenation device according to claim 1, wherein the heterogeneous medium filter material layer comprises three layers of filter materials, wherein the upper layer of filter materials are polymer particle materials or soft fillers with lighter materials, the particle size of the filter materials is 0.3-1.5 mm, and the density is 1.2-2.0 g/cm 2 The bed thickness is 0.2-0.3 m; the middle layer filter material is made of inorganic particle material, the particle size of the filter material is 1.5-2.4 mm, and the medium density is 1.8-3.1 g/cm 2 The bed thickness is 0.2-0.3 m; the material of the lower filter material is heavy large-size particles, the particle size of the filter material is 3-5 mm, and the density of the medium is 2.6-5.2 g/cm 2 The bed thickness is 0.2-0.3 m.
3. The oil removal and solid removal integrated device for process water of an ethylene-propylene dehydrogenation device according to claim 1, and is characterized in that the diameter size of the water distribution disc is 0.5-0.75 times of the diameter of the vertical tank body, and the distance between the water distribution disc and the tangent line at the upper part of the vertical tank body is 0.1-0.2 m; the distance between the boiling stop baffle and the opposite medium filter material layer is 0.2-0.25 times of the height of the opposite medium filter material layer.
4. The oil removal and solidification integrated device for process water of an ethylene-propylene dehydrogenation device according to claim 1, wherein the compact module combination integrated device comprises a horizontal tank body, a water inlet and an oil discharge bag, wherein the water inlet and the oil discharge bag are arranged at two ends of the top of the horizontal tank body, a liquid level meter is arranged at the side edge of the oil discharge bag, a second oil discharge port is arranged at the top of the oil discharge bag, and a second sewage outlet is arranged at the bottom of the horizontal tank body opposite to the oil discharge bag; the self-adaptive rotational flow module, the woven fiber module and the gravity-reinforced sedimentation module are sequentially arranged in the horizontal tank body along the liquid flowing direction, the water inlet of the horizontal tank body is connected with the first sewage draining outlet, and the process sewage treated by the compact combined integrated equipment is discharged through the second sewage draining outlet.
5. The integrated device for removing oil and solid from process water of an ethylene-propylene dehydrogenation device according to claim 4, wherein the self-adaptive cyclone module comprises 2-3 parallel self-adaptive cyclone multiphase separation devices, the gravity-enhanced sedimentation module comprises at least two corrugated plates, and the corrugated plates are clung to the outer side ends of the woven fiber modules; the water inlet of the self-adaptive rotational flow multiphase separation equipment is connected with the water inlet of the horizontal tank body, the water phase separated by the self-adaptive rotational flow multiphase separation equipment enters the woven fiber module, and the oil phase enters the oil drainage bag.
6. The integrated device for removing oil and solids from process water of an ethylene-propylene dehydrogenation device according to claim 1, and is characterized in that a back washing gas-liquid inlet is formed in the top of the dissolved gas-water buffer tank, and a gas inlet, a back washing water inlet and a dissolved gas-water outlet are formed in the side wall of the dissolved gas-water buffer tank; the air dissolving pump is communicated with the backwash water inlet and the air inlet, the parting bubble generator is arranged below the water filtering cap assembly in the vertical tank body, the bottom and the top of the vertical tank body are respectively provided with an air dissolving water inlet, the air dissolving water outlet is communicated with the air dissolving water inlet through the circulating pump, and air dissolving water enters the vertical tank body and then forms uniform bubbles through the parting bubble generator; the top of the vertical tank body is provided with a backwash gas-liquid outlet communicated with the backwash gas-liquid inlet, and the top of the vertical tank body below the backwash gas-liquid outlet is provided with a material leakage preventing module.
7. An oil removal and fixation integrated method for process water of an ethylene-propane dehydrogenation device, which adopts the oil removal and fixation integrated device as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
(1) The incoming sewage enters the opposite medium filtering module through a process water feed inlet, enters the opposite medium filtering layer after being rectified by the water diversion disk, and is captured and coalesced by oil drops of the opposite medium filtering layer, and after the suspended matters are intercepted and separated, the preliminary treatment of the oil drops and the suspended matters is realized;
(2) The sewage subjected to preliminary oil removal and solid removal treatment by the foreign medium filtering module enters the compact module combination integrated equipment through the first sewage outlet, and the deep removal of oil drops is realized under the actions of the self-adaptive rotational flow module, the woven fiber module and the gravity-enhanced sedimentation module in sequence.
8. The method of claim 7, wherein after the oil removal and solids removal process is performed on the incoming sewage, the air-dissolved water backwashing system is used for backwashing and regenerating the heterogeneous medium filter material layer, and the method comprises the following steps:
(1) Injecting nitrogen into the anisotropic medium filtering module, and puffing the anisotropic medium filtering layer after the nitrogen is uniformly distributed in the water filtering cap assembly;
(2) Opening a backwash water inlet, sucking backwash clear water and nitrogen into a dissolved air water buffer tank under the negative pressure action of a dissolved air pump, and removing bubbles which are difficult to dissolve in water under the sedimentation action of the dissolved air water buffer tank;
(3) Injecting the dissolved air water in the step (2) into the bottom of the vertical tank body, wherein the dissolved air water generates fractal bubbles with different sizes and uniform forms through the parting bubble generator, and the fractal bubbles are distributed through the water filtering cap assembly and then perform preliminary backwashing on the heterogeneous medium filtering material layer;
(4) And stopping injecting nitrogen, only injecting backwash clear water, stabilizing the bed of the anisotropic medium filter material layer, and recovering the normal working state of the equipment.
9. The method of claim 8, wherein Q is normal operating flow, the backwash volume of the expanded bed of step (1) of the backwash process is 1Q to 6Q and the inlet expansion time is 20 to 30 minutes; the flow of the backwashing clear water in the step (2) is 1Q-5Q, the flow of the backwashing nitrogen is 1Q-6Q, and the time of the combined backwashing of air and water is 20-60 min; the water inflow of the stable bed is 0.5-2Q, and the time for stabilizing the bed is 15-25 min.
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| CN112390420A (en) * | 2020-11-17 | 2021-02-23 | 华东理工大学 | System and method suitable for treating complex produced liquid of offshore gas field |
| CN112520921A (en) * | 2020-12-01 | 2021-03-19 | 华东理工大学 | Multi-physical-field-synergetic oily sewage treatment method and device |
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