CN115536195A - Cooling water treatment system for reducing temperature of coal gas and using method thereof - Google Patents
Cooling water treatment system for reducing temperature of coal gas and using method thereof Download PDFInfo
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Images
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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the field of treatment of water, wastewater, sewage or sludge, in particular to a cooling water treatment system for coal gas cooling and a use method thereof. The utility model provides a cooling water treatment system for coal gas cooling, includes equalizing basin (1), characterized by: the device is characterized by further comprising a deamination tower (2), a high-density clarification tank (3), a V-shaped filter tank (4), an ozone contact oxidation tank (5), an oxidation stabilization tank (6), a multi-medium filter (7), a multi-medium filter water production tank (8), an ultrafiltration device (9), an ultrafiltration water production tank (10), a reverse osmosis device (11) and a reverse osmosis water production tank (12) which are arranged in sequence. The invention has the advantages of thorough treatment and stable effect.
Description
Technical Field
The invention relates to the field of treatment of water, wastewater, sewage or sludge, in particular to a cooling water treatment system for coal gas cooling and a use method thereof.
Background
In the smelting process of the blast furnace, because thick coke in the coke is combusted in the furnace cylinder, the air in the furnace is gradually changed into insufficient air to be combusted, and blast furnace gas is generated. In the process of gas washing, gas and calcium oxide dust particles are easy to dissolve in water, and the contents of ammonia nitrogen, COD, conductivity, total hardness, chloride and the like in water are increased due to the components of raw materials and fuel, so that the direct discharge requirement is not met. With the increasing national requirements on energy conservation and emission reduction, the wastewater treatment after reaching the standard is a necessary trend. The traditional treatment method has the defects of low efficiency of the processes such as precipitation, desalination and the like, incomplete treatment and difficulty in enabling blast furnace gas cooling water to meet the recycling standard.
Disclosure of Invention
The invention provides a wastewater treatment device with thorough treatment and stable effect, and discloses a cooling water treatment system for cooling coal gas and a using method thereof, aiming at overcoming the defects of the prior art.
The invention achieves the purpose through the following technical scheme:
the utility model provides a cooling water treatment system for coal gas cooling, includes the equalizing basin, characterized by: also comprises a deamination tower, a high-density clarification tank, a V-shaped filter tank, an ozone contact oxidation tank, an oxidation stabilization tank, a multi-medium filter water producing tank, an ultrafiltration device, an ultrafiltration water producing tank, a reverse osmosis device and a reverse osmosis water producing tank,
the device comprises a regulating reservoir, a deamination tower, a high-density clarification tank, a V-shaped filter tank, an ozone contact oxidation tank, an oxidation stabilization tank, a multi-media filter water production tank, an ultrafiltration device, an ultrafiltration water production tank, a reverse osmosis device and a reverse osmosis water production tank which are sequentially arranged and are in a forward water flow direction, wherein the regulating reservoir receives cooling wastewater;
the regulating tank and the deamination tower, the deamination tower and the high-density clarification tank, and the V-shaped filter tank and the ozone contact oxidation tank are connected by water conveying pipes connected with a water pump in series;
the high-density clarification tank and the V-shaped filter tank, the ozone contact oxidation tank and the oxidation stabilization tank, the oxidation stabilization tank and the multi-medium filter, the multi-medium filter and the multi-medium filter water production tank, the ultrafiltration device and the ultrafiltration water production tank, and the reverse osmosis device and the reverse osmosis water production tank are connected through water conveying pipes;
the multi-medium filter water generating tank is also respectively connected with the ozone contact oxidation tank and the multi-medium filter through a water conveying pipe which is connected with a water pump in series;
the multi-medium filter water generating tank and the ultrafiltration device are connected through a water conveying pipe which is sequentially connected with a water pump and a self-cleaning filter in series;
the ultrafiltration water producing tank is also connected with an ultrafiltration device through a water pipe which is sequentially connected with a water pump and a security filter in series;
the ultrafiltration water producing tank is connected with the reverse osmosis device through a water pipe which is sequentially connected with a water pump, a cartridge filter and the water pump in series;
the cooling water treatment system for cooling coal gas is characterized in that: the filter hole of the filter in the reverse osmosis device is not more than 5 μm, and the high-pressure pump in the reverse osmosis device is driven by a variable frequency motor.
The use method of the cooling water treatment system for reducing the temperature of the coal gas is characterized by comprising the following steps of: the method is implemented in sequence according to the following steps:
i. and (3) deamination: the regulating reservoir receives the cooling wastewater and then inputs the cooling wastewater into a deamination tower under the suction of a water pump, ammonia gas in the deamination tower is separated from the cooling wastewater by a fan by using the blowing-off and adsorption principles and then the pH value of the cooling wastewater is regulated by a pH regulating reservoir, the blown-off ammonia gas is collected by dilute sulfuric acid to form an ammonium sulfate solution, and the ammonium sulfate solution is periodically sent to a coking process for consumption, so that the environment is not polluted;
precipitation: the cooling water treated by the deamination tower is pumped by a water pump and then is input into a high-density clarification tank for sedimentation;
filtering: the cooling water precipitated by the high-density clarification tank overflows to the V-shaped filter tank, the cooling water is filtered on a filter material of the V-shaped filter tank, and a blocking sensor in the V-shaped filter tank monitors the water head condition of the V-shaped filter tank;
oxidation: the cooling water treated by the V-shaped filter tank is pumped by a water pump and is input into an ozone contact oxidation tank, the cooling water is oxidized by ozone in the ozone contact oxidation tank, impurities dissolved in the cooling water are damaged by oxidation,
v. deoxidation: the cooling water treated by the ozone contact oxidation pond overflows to an oxidation stabilization pond, the cooling water is heated in the oxidation stabilization pond, and the residual ozone in the cooling water is decomposed and destroyed by heat;
filtering: the cooling water treated by the oxidation stabilization tank overflows to a multi-media filter, and the cooling water is further filtered in the multi-media filter;
storing: the cooling water treated by the multi-medium filter overflows to a multi-medium filter water production pool for storage, and if the index of the cooling water does not meet the requirement, the cooling water stored in the multi-medium filter water production pool respectively reflows to the ozone contact oxidation pool and the multi-medium filter for secondary treatment under the suction of a water pump;
ultrafiltration: cooling water stored in the water producing pool of the multi-media filter is pumped by a water pump, filtered by a self-cleaning filter and an ultrafiltration device in sequence and then input into the ultrafiltration water producing pool for storage, a backwashing device of the ultrafiltration device regularly performs backwashing to remove solid particles deposited on the surface of the membrane, so that the deposition of the solid particles near the membrane is avoided, and dirt which is adsorbed on the surface of the membrane and cannot be removed by backwashing is removed by on-line Chemically Enhanced Backwashing (CEB); if the index of the cooling water does not meet the requirement, the cooling water stored in the ultrafiltration water production tank is pumped by a water pump, filtered by a cartridge filter and then input into an ultrafiltration device for secondary treatment;
and ix, desalting: the cooling water stored in the ultrafiltration water producing pond is filtered by a cartridge filter and desalted by a reverse osmosis device in sequence under the suction of a water pump and is input into the reverse osmosis water producing pond for storage, the reverse osmosis device removes dissolved salts in the cooling water, organic macromolecules, small particles which are not removed in the previous stage and the like, a reverse osmosis system selects a special anti-pollution membrane element for the wastewater, the operation pressure is low, the desalination rate is high, no leakage exists in the connection between the membrane and the membrane, the selected high-pressure pump, an instrument and a frequency converter are famous manufacturers at home and abroad, the quality is reliable, the frequency converter is selected for reducing the energy consumption operation, the system is more flexible to operate, the water yield can be adjusted at low temperature, and the water using requirement is met.
The use method of the cooling water treatment system for reducing the temperature of the coal gas is characterized by comprising the following steps of:
step iii, monitoring the water head condition of the V-shaped filter by using a blocking sensor to ensure that the water head of not less than 1.2m is always kept on the filter material of the V-shaped filter, so that effective filtering pressure is kept, and negative pressure is not generated on each depth of a filter medium;
in the step v, the residual concentration of ozone in the cooling water is less than 0.08ppm, and the cooling water can be directly discharged into the atmosphere;
and in step viii, the SDI value of the produced water is less than 3.
The invention carries out pretreatment and advanced treatment on blast furnace gas cooling water, the quality of produced water meets the requirement of industrial water, and concentrated water is sent into a blast furnace slag flushing and steel slag unit for consumption, thus being an optimization treatment method with strong pertinence and multiple processes.
The invention realizes the deamination, hardness removal and desalination of blast furnace gas cooling water from the source of the iron and steel enterprise, takes the water supply, water use, water drainage, consumption and other aspects into consideration and considers the long-term development. Meanwhile, the water resource consumption is reduced, the water pollution degree is reduced, the process flow is smooth, the operation is reliable, and the maintenance is convenient.
The method adopts multiple process technologies for optimal and reasonable configuration, firstly carries out pretreatment on the gas cooling water, utilizes a deamination tower to reduce the content of ammonia nitrogen in the wastewater, adopts a high-density clarification tank and a V-shaped filter tank to remove hardness, suspended matters and colloid in the wastewater, adopts an ozone contact oxidation tank to oxidize refractory macromolecular pollutants into micromolecular substances and remove COD (chemical oxygen demand) in the degraded water, and utilizes an oxidation stabilization tank to digest residual ozone in the ozone catalytic oxidation tank wastewater; then in the advanced treatment system, a multi-medium filter and a self-cleaning filter are used for removing suspended matters, an ultrafiltration device is used for removing solid particles deposited on the surface of the membrane, and finally a reverse osmosis system is used for desalting and removing organic macromolecules, small particles which are not removed in the previous stage and the like.
The invention has the following beneficial effects: the treatment effect is stable, the treated effluent can be reused for production after reaching the industrial water standard, the zero discharge of the wastewater is realized, the consumption of industrial new water is saved, and the water consumption per ton of the product is reduced.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
The utility model provides a cooling water processing system for coal gas cooling, includes equalizing basin 1, deaminizing tower 2, high density clarification tank 3, V type filtering pond 4, ozone contact oxidation pond 5, oxidation stabilization pond 6, multi-media filter 7, multi-media filter produce pond 8, ultrafiltration device 9, ultrafiltration product pond 10, reverse osmosis unit 11 and reverse osmosis product pond 12, as shown in figure 1, the concrete structure is:
the device comprises an adjusting tank 1, a deamination tower 2, a high-density clarification tank 3, a V-shaped filter tank 4, an ozone contact oxidation tank 5, an oxidation stabilization tank 6, a multi-media filter 7, a multi-media filter water production tank 8, an ultrafiltration device 9, an ultrafiltration water production tank 10, a reverse osmosis device 11 and a reverse osmosis water production tank 12 which are sequentially arranged in a forward water flow direction, wherein the adjusting tank 1 receives cooling wastewater, a pH adjusting tank 21 is arranged in front of a water outlet in the deamination tower 2, a blockage sensor 41 is arranged in the V-shaped filter tank 4 to monitor the working condition of the V-shaped filter tank 4, a reverse osmosis device 91 is arranged in the ultrafiltration device 9, a filter 111 and a high-pressure pump 112 are arranged in the reverse osmosis device 11, and the reverse osmosis water production tank 12 inputs the treated cooling water into a clean water tank to supplement industrial water;
the regulating tank 1 and the deamination tower 2, the deamination tower 2 and the high-density clarification tank 3, and the V-shaped filter tank 4 and the ozone contact oxidation tank 5 are connected by water pipes connected with a water pump 131 in series;
the high-density clarification tank 3 and the V-shaped filter tank 4, the ozone contact oxidation tank 5 and the oxidation stabilization tank 6, the oxidation stabilization tank 6 and the multi-medium filter 7, the multi-medium filter 7 and the multi-medium filter water production tank 8, the ultrafiltration device 9 and the ultrafiltration water production tank 10, and the reverse osmosis device 11 and the reverse osmosis water production tank 12 are connected through water conveying pipes;
the multi-media filter water generating tank 8 is also respectively connected with the ozone contact oxidation tank 5 and the multi-media filter 7 through a water conveying pipe which is connected with a water pump 131 in series;
the multi-medium filter water generating tank 8 and the ultrafiltration device 9 are connected through a water conveying pipe which is sequentially connected with a water pump 131 and a self-cleaning filter 132 in series;
the ultrafiltration water producing tank 10 is also connected with the ultrafiltration device 9 through a water conveying pipe which is sequentially connected with a water pump 131 and a security filter 133 in series;
the ultrafiltration water producing tank 10 and the reverse osmosis device 11 are connected through a water pipe which is sequentially connected with a water pump 131, a cartridge filter 133 and the water pump 131 in series;
in this embodiment: the filter 111 in the reverse osmosis device 11 has a filtration pore size not larger than 5 μm, and the high-pressure pump 112 in the reverse osmosis device 11 is driven by a variable frequency motor.
When the method is used, the steps are implemented in sequence as follows:
i. and (3) deamination: the adjusting tank 1 receives cooling wastewater and then inputs the cooling wastewater into the deamination tower 2 under the suction of the water pump 131, ammonia gas in the deamination tower 2 is separated by a fan through the blowing-off and adsorption principles and then the pH value of the cooling wastewater is adjusted by the pH adjusting tank 21, the blown-off ammonia gas is collected by dilute sulfuric acid to form an ammonium sulfate solution, and the ammonium sulfate solution is periodically sent to a coking process for consumption without polluting the environment.
Precipitation: the cooling water treated by the deamination tower 2 is pumped by a water pump 131 and then is input into a high-density clarification tank 3 for sedimentation.
The high-density clarification tank is a novel high-efficiency clarification process after an advection type sedimentation tank, an inclined plate (pipe) sedimentation tank and a mechanical acceleration (pulse) clarification tank, and adopts an inclined pipe sedimentation and sludge circulation mode. The high-density clarification tank has the characteristics of small occupied area, civil engineering investment saving, strong shock load resistance, wide applicability, high efficiency and the like. The high-density clarification tank consists of an integrated coagulation area, a flocculation area, a sedimentation area and a sludge concentration area, and the matched facilities comprise sludge reflux, sludge discharge, a dosing device, a control system and the like. Coagulant, lime milk, sodium carbonate and flocculant are added into the high-density clarification tank, suspended matters in the incoming water, alkalinity and hardness of the water can be removed, and the effluent enters a V-shaped filter tank after pH adjustment. And (4) discharging the sludge precipitated in the high-density clarification tank into a sludge storage tank in a sludge dewatering room, and carrying out outward after dewatering.
Filtering: the cooling water precipitated by the high-density clarification tank 3 overflows to the V-shaped filter tank 4, the cooling water is filtered on the filter material of the V-shaped filter tank 4, and a blocking sensor 41 in the V-shaped filter tank 4 monitors the water head condition of the V-shaped filter tank 4 so as to ensure that the water head which is not lower than 1.2m is always kept on the filter material of the V-shaped filter tank 4, thereby keeping effective filtering pressure and ensuring that negative pressure is not generated on each depth of a filter medium.
The V-shaped filter is a fast filter for filtering at a constant water level. The V-shaped filter chamber is provided with a back washing system for air, water and surface sweeping, measures for preventing filter material from losing and disturbing layers are taken, and full-automatic control operation of filtering and back washing is realized. A liquid level sensor is arranged in each group of filter tanks, the liquid level of the filter tanks is controlled by a filter tank water outlet regulating valve, and a blocking sensor is arranged in each filter tank and used for monitoring the working condition of the filter tanks. A water head not less than 1.2m is arranged above the filtering material to keep effective filtering pressure, so that negative pressure is not generated on each depth of the filtering medium. The main process control valve of the filter adopts a pneumatic valve. An on-line turbidimeter was fitted to detect water quality. The outlet water of the V-shaped filter tank is lifted to an ozone contact oxidation tank by a pump.
Oxidation: the cooling water treated by the V-shaped filter 4 is pumped by the water pump 131 and is input into the ozone contact oxidation pond 5, the cooling water is oxidized by ozone in the ozone contact oxidation pond 5, and impurities dissolved in the cooling water are damaged by oxidation.
The ozone contact oxidation pond 5 is internally provided with an ozone generator, all the internal overflowing parts are made of carbon steel and coated with glass fiber reinforced plastic flakes, the device is in a tower shape, the lower part of the device is filled with water, the upper part of the device is filled with water, a catalyst is arranged in the tower, cooling water and ozone provided by the ozone generator are fully mixed in the filling layer in the pond, organic pollutants in wastewater are catalyzed and destabilized by a high-activity load-type catalyst on the filler, ozone is caused to form more active OH-, the oxidation reaction rate and the oxidation utilization rate are improved, meanwhile, cyclic substances and long-chain molecules in the wastewater are broken, macromolecular pollutants which are difficult to degrade are oxidized into micromolecular substances, the ozone consumption is reduced, and the investment and the operation cost are saved. The effluent flows to the oxidation stabilization tank 6 by gravity.
The water quality of each unit of the pretreatment system is shown in the following table:
v. deoxidation: the cooling water treated by the ozone contact oxidation pond 5 overflows to the oxidation stabilization pond 6, the cooling water is heated in the oxidation stabilization pond 6, the ozone remained in the cooling water is decomposed and destroyed by heat, the residual concentration of the ozone is less than 0.08ppm, and the cooling water can be directly discharged into the atmosphere.
Filtering: the cooling water treated by the oxidation stabilization tank 6 overflows to the multimedia filter 7, and the cooling water is further filtered in the multimedia filter 7.
Storing: the cooling water treated by the multi-medium filter 7 overflows to the multi-medium filter water producing tank 8 for storage, and if the index of the cooling water does not meet the requirement, the cooling water stored in the multi-medium filter water producing tank 8 respectively reflows to the ozone contact oxidation tank 5 and the multi-medium filter 7 for retreatment under the suction of the water pump 131.
Ultrafiltration: cooling water stored in the multi-media filter water production tank 8 is pumped by a water pump 131, filtered by a self-cleaning filter 132 and filtered by an ultrafiltration device 9 in sequence and then input into an ultrafiltration water production tank 10 for storage, a backwashing device 91 of the ultrafiltration device 9 periodically performs backwashing to remove solid particles deposited on the surface of a membrane, so that the deposition of the solid particles near the membrane is avoided, dirt which is adsorbed on the surface of the membrane and cannot be removed by backwashing is removed by on-line Chemically Enhanced Backwashing (CEB), and the SDI value of the produced water is less than 3; if the index of the cooling water does not meet the requirement, the cooling water stored in the ultrafiltration water producing tank 10 is pumped by the water pump 131, filtered by the cartridge filter 133 and then input into the ultrafiltration device 9 for secondary treatment.
Ultrafiltration is a pressure-driven membrane separation process that separates particulate matter, macromolecular organic matter, microorganisms, etc. from fluids and dissolved constituents. The typical pore diameter of the ultrafiltration membrane is between 0.01 and 0.1 mu m, and the ultrafiltration membrane has extremely high removal rate on bacteria, most germs, colloid, sludge and the like. The ultrafiltration membrane separation technology has the characteristics of small occupied area, good effluent quality, high automation degree and the like. This system adopts the antipollution milipore filter element that uses under the high polluted environment, has high strength, withstand voltage, acid and alkali-resistance, antipollution, long service life, and the cavity milipore filter can guarantee for a long time that produces water quality of water, has good separating power to colloid, suspended particles, colourity, turbidity, bacterium, macromolecule organic matter, produces water SDI value and is less than 3, satisfies the requirement of getting into reverse osmosis membrane system and intaking. The ultrafiltration system is provided with backwashing and chemically enhanced backwashing functions to remove solid particles deposited on the membrane surface by periodic backwashing, and the solid dirt is removed by the periodic backwashing, thereby avoiding the deposition of the solid dirt near the membrane. Those contaminants that are adsorbed on the membrane surface and cannot be removed by backwashing are removed by an on-line Chemically Enhanced Backwash (CEB). Ultrafiltration CIP cleaning can clean some difficult to rinse soils, such as organic, inorganic salt scale, that accumulate over long runs to restore membrane performance. Then the wastewater is desalted through ultrafiltration and reverse osmosis in turn.
The ultrafiltration device 9 as the front-end of the reverse osmosis uses the pressure difference between two sides of the membrane as the driving force, uses the ultrafiltration membrane as the filtering medium, under a certain pressure, when raw water flows through the surface of the membrane, a plurality of fine micropores densely distributed on the surface of the ultrafiltration membrane only allow water and small molecular substances to pass through to form permeate liquid, substances in the raw water with the volume larger than the micropore diameter of the surface of the membrane are intercepted on the liquid inlet side of the membrane to form concentrated liquid, and colloids, rust, suspended matters, silt, macromolecular organic matters and the like can be intercepted by the ultrafiltration membrane, so that the purposes of purification, separation and concentration of the raw water are realized. A reinforced external pressure type ultrafiltration membrane made of PVDF (polyvinylidene fluoride) is adopted, a support is arranged in the ultrafiltration membrane, and the filtration precision is 0.02 mu m.
And ix, desalting: the cooling water stored in the ultrafiltration water producing tank 10 is filtered by the security filter 133 and desalted by the reverse osmosis device 11 under the suction of the water pump 131, and then is input into the reverse osmosis water producing tank 12 for storage, the reverse osmosis device 11 removes dissolved salts, organic macromolecules, small particles which are not removed in the previous stage and the like in the cooling water, the reverse osmosis system selects a special anti-pollution membrane element for the wastewater, the operation pressure is low, the desalting rate is high, no leakage exists in the connection between the membranes, the variable frequency motor is selected to drive the high-pressure pump 112 to reduce the energy consumption for operation, the system is more flexible to operate, and the water yield can be adjusted at low temperature, so as to meet the water use requirement.
The filtration precision of the cartridge filter 133 before the reverse osmosis device 11 is 5 μm, an anti-pollution membrane with a desalination rate of 99.7% is adopted, the type of the membrane is a polyamide composite membrane, and the recovery rate of a single membrane is 15%.
In this embodiment, the physical and chemical effluent is softened by using weak acid cation exchange resin, and the principle of the ion exchange softening method is that raw water passes through a cation exchanger to exchange calcium and magnesium ions with sodium ions or hydrogen ions in an exchanger, and sodium or hydrogen is substituted to achieve the effect of softening water, the hardness of the effluent can be reduced to below 0.03mmol/L, and a typical reaction can be represented by the following ion reaction formula:
Ca 2+ +2RNa→R 2 Ca+2Na + ，
Mg 2+ +2RNa→R 2 Mg+2Na + 。
reverse osmosis (reverse osmosis) is a membrane separation operation that separates a solvent from a solution using a pressure difference as a driving force. The reverse osmosis membrane system comprises a 5-micron filter, a high-pressure pump, a reverse osmosis device and the like, and undertakes a desalting task, mainly removes dissolved salts in water, and simultaneously removes organic macromolecules, small particles which are not removed in the previous stage and the like. The salt-containing wastewater entering the reverse osmosis membrane system permeates most of water molecules and trace other ions through the membrane under the action of pressure, is collected to form product water, and enters a reuse water pool through a water production pipeline. Most of salt, colloid, organic matters and the like in the water can not permeate the membrane, remain in a small amount of concentrated water and are discharged from the concentrated water pipe. When the membrane device is stopped, the membrane device is automatically washed for 3-5 min to remove dirt deposited on the surface of the membrane, so that the device and the reverse osmosis membrane are effectively maintained. The reverse osmosis produced water flows into a central water plant clean water tank by gravity and is reused as industrial water for plant area units. The concentrated water is conveyed to a concentrated water pipe network of a central water plant by a pump and conveyed to a steel slag unit and a blast furnace for slag flushing and absorption.
The water quality of each unit of the embodiment is shown in the following table:
Claims (4)
1. the utility model provides a cooling water treatment system for coal gas cooling, includes equalizing basin (1), characterized by: also comprises a deamination tower (2), a high-density clarification tank (3), a V-shaped filter tank (4), an ozone contact oxidation tank (5), an oxidation stabilization tank (6), a multi-medium filter (7), a multi-medium filter water production tank (8), an ultrafiltration device (9), an ultrafiltration water production tank (10), a reverse osmosis device (11) and a reverse osmosis water production tank (12),
the device comprises a regulating tank (1), a deamination tower (2), a high-density clarification tank (3), a V-shaped filter tank (4), an ozone contact oxidation tank (5), an oxidation stabilization tank (6), a multi-medium filter (7), a multi-medium filter water production tank (8), an ultrafiltration device (9), an ultrafiltration water production tank (10), a reverse osmosis device (11) and a reverse osmosis water production tank (12), wherein the twelve components are sequentially arranged and are in a water flow forward direction, the regulating tank (1) receives cooling wastewater, a pH regulating tank (21) is arranged in front of a water outlet in the deamination tower (2), a blocking sensor (41) is arranged in the V-shaped filter tank (4), a reverse osmosis device (91) is arranged in the ultrafiltration device (9), a filter (111) and a high-pressure pump (112) are arranged in the reverse osmosis device (11), and the reverse osmosis water production tank (12) inputs the treated cooling water into the clean water tank;
the regulating tank (1) and the deamination tower (2), the deamination tower (2) and the high-density clarification tank (3), and the V-shaped filter tank (4) and the ozone contact oxidation tank (5) are connected by water pipes connected with a water pump (131) in series;
the high-density clarification tank (3) is connected with the V-shaped filter tank (4), the ozone contact oxidation tank (5) is connected with the oxidation stabilization tank (6), the oxidation stabilization tank (6) is connected with the multi-medium filter (7), the multi-medium filter (7) is connected with the multi-medium filter water production tank (8), the ultrafiltration device (9) is connected with the ultrafiltration water production tank (10), and the reverse osmosis device (11) is connected with the reverse osmosis water production tank (12) through water pipes;
the multi-media filter water generating tank (8) is also respectively connected with the ozone contact oxidation tank (5) and the multi-media filter (7) through a water conveying pipe which is connected with a water pump (131) in series;
the multi-medium filter water generating tank (8) is connected with the ultrafiltration device (9) through a water conveying pipe which is sequentially connected with a water pump (131) and a self-cleaning filter (132) in series;
the ultrafiltration water producing tank (10) is also connected with an ultrafiltration device (9) through a water pipe which is sequentially connected with a water pump (131) and a security filter (133) in series;
the ultrafiltration water producing pool (10) is connected with the reverse osmosis device (11) through a water pipe which is connected with a water pump (131), a cartridge filter (133) and the water pump (131) in series in sequence.
2. The cooling water treatment system for gas cooling as claimed in claim 1, wherein: the filtration pore of the filter (111) in the reverse osmosis device (11) is not more than 5 μm, and the high-pressure pump (112) in the reverse osmosis device (11) is driven by a variable frequency motor.
3. The use method of the cooling water treatment system for gas cooling according to claim 1 or 2, characterized by comprising the following steps: the method is implemented in sequence according to the following steps:
i. and (3) deamination: the regulating tank (1) receives the cooling wastewater, then the cooling wastewater is pumped by a water pump (131) and is input into the deamination tower (2), ammonia gas in the cooling wastewater in the deamination tower (2) is separated by a fan, and then the pH value is regulated by the pH regulating tank (21);
precipitation: the cooling water treated by the deamination tower (2) is pumped by a water pump (131) and then is input into a high-density clarification tank (3) for precipitation;
filtering: the cooling water precipitated by the high-density clarification tank (3) overflows to the V-shaped filter tank (4), the cooling water is filtered on a filter material of the V-shaped filter tank (4), and a blockage sensor (41) in the V-shaped filter tank (4) monitors the water head condition of the V-shaped filter tank (4);
oxidation: the cooling water treated by the V-shaped filter tank (4) is pumped by a water pump (131) and is input into an ozone contact oxidation tank (5), the cooling water is oxidized by ozone in the ozone contact oxidation tank (5), impurities dissolved in the cooling water are damaged by oxidation,
v. deoxidation: the cooling water treated by the ozone contact oxidation pond (5) overflows to an oxidation stabilization pond (6), the cooling water is heated in the oxidation stabilization pond (6), and the ozone remained in the cooling water is decomposed and destroyed by heat;
filtering: the cooling water treated by the oxidation stabilization tank (6) overflows to a multi-media filter (7), and the cooling water is further filtered in the multi-media filter (7);
storing: the cooling water treated by the multi-medium filter (7) overflows to a multi-medium filter water producing tank (8) for storage, and if the index of the cooling water does not meet the requirement, the cooling water stored in the multi-medium filter water producing tank (8) respectively reflows to the ozone contact oxidation tank (5) and the multi-medium filter (7) for retreatment under the suction of a water pump (131);
ultrafiltration: cooling water stored in a multi-media filter water production tank (8) is pumped by a water pump (131), filtered by a self-cleaning filter (132) and filtered by an ultrafiltration device (9) in sequence and then is input into an ultrafiltration water production tank (10) for storage, a backwashing device (91) of the ultrafiltration device (9) periodically performs backwashing to remove solid particles deposited on the surface of a membrane, so that the deposition of the solid particles near the membrane is avoided, and dirt which is adsorbed on the surface of the membrane and cannot be removed by backwashing is removed by online chemically enhanced backwashing; if the index of the cooling water does not meet the requirement, the cooling water stored in the ultrafiltration water producing tank (10) is pumped by a water pump (131), filtered by a cartridge filter (133) and then input into an ultrafiltration device (9) for secondary treatment;
and ix, desalting: the cooling water stored in the ultrafiltration water producing tank (10) is filtered by a cartridge filter (133) and desalted by a reverse osmosis device (11) under the suction of a water pump (131) and is input into a reverse osmosis water producing tank (12) for storage, and the reverse osmosis device (11) removes dissolved salts and organic macromolecules in the cooling water and small particles which are not removed in the previous stage.
4. The use method of the cooling water treatment system for gas temperature reduction as claimed in claim 3, characterized in that:
in the step iii, the water head condition of the V-shaped filter tank (4) is monitored by a blocking sensor (41) to ensure that a water head which is not lower than 1.2m is always kept on a filter material of the V-shaped filter tank (4), so that effective filtering pressure is kept, and negative pressure is not generated on each depth of a filter medium;
in the step v, the residual concentration of the ozone in the cooling water is less than 0.08ppm, and the cooling water can be directly discharged into the atmosphere;
and in step viii, the SDI value of the produced water is less than 3.
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