CN114602392B - Operation method of tubular high-pressure polyethylene reactor with ultrasonic descaling device - Google Patents
Operation method of tubular high-pressure polyethylene reactor with ultrasonic descaling device Download PDFInfo
- Publication number
- CN114602392B CN114602392B CN202210265598.1A CN202210265598A CN114602392B CN 114602392 B CN114602392 B CN 114602392B CN 202210265598 A CN202210265598 A CN 202210265598A CN 114602392 B CN114602392 B CN 114602392B
- Authority
- CN
- China
- Prior art keywords
- reactor
- ultrasonic
- transducer
- tubular
- heat exchange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
- B01J3/042—Pressure vessels, e.g. autoclaves in the form of a tube
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
- B08B7/026—Using sound waves
- B08B7/028—Using ultrasounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/02—Ethene
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to an operation method of a tubular high-pressure polyethylene reactor with an ultrasonic descaling device, which comprises the following steps: providing a tubular high-pressure polyethylene reactor with an ultrasonic descaling device, monitoring temperature and pressure signals of materials at the inner side and the outer side of the tubular reactor on line in real time, and predicting the phase balance state of the materials at the inner side of a reaction tube and the real-time heat transfer coefficient K of the reaction tube in real time 0 Calculating ideal heat transfer coefficient K of reaction tube i And predicts the fouling thermal resistance R of the reaction tube f The method comprises the steps of carrying out a first treatment on the surface of the And judging whether to start the ultrasonic descaling device according to the calculation result. The invention has obvious descaling effect by controlling the intermittent operation of the ultrasonic generator and the transducer and controlling the temperature of the heat exchange water inlet, and can always keep the highest efficiency of heat transfer between materials in the reactor and the heat exchange water; improving the productivity.
Description
Technical Field
The invention belongs to the field of design of a tubular high-pressure polyethylene reactor, and particularly relates to an operation method of the tubular high-pressure polyethylene reactor with an ultrasonic descaling device.
Background
In the production of high-pressure polyethylene by a tubular method, the wall sticking phenomenon of a reactor is unavoidable, and the heat transfer resistance is increased and the heat exchange efficiency is reduced due to the dirt formed by the wall sticking phenomenon, so that the reaction yield and the product quality are greatly influenced, and the safety and the stability of the reaction are greatly endangered. The current industrial scale removal method mainly adjusts the process conditions, such as increasing the inlet temperature of heat exchange water. The method often has an insufficient and obvious descaling effect, can influence the properties of products, has obvious hysteresis, and cannot clean dirt in time. The ultrasonic descaling technology has wide application, and the scale in the reactor loosens and falls off through four effects of cavitation, activation, shearing and inhibition in the process of ultrasonic wave propagation, so that the effects of descaling and scale prevention are achieved.
At present, the ultrasonic descaling device is not applied to the high-pressure polymerization reactor, even if the application is considered, the ultrasonic descaling device cannot predict the scaling behavior and scaling degree in the reactor, so that the ultrasonic generator and the ultrasonic transducer are required to continuously work to achieve the purpose of descaling, and the operation can well achieve the effects of descaling and scaling prevention, but also greatly increases the workload and the running cost of the ultrasonic generator and the ultrasonic transducer.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, improve the production efficiency of a tubular high-pressure polyethylene reactor, solve the problem of continuous operation caused by the fact that the conventional ultrasonic descaling device cannot predict the scale formation behavior and the scale formation degree, and reduce the production energy consumption.
The invention provides an operation method of a tubular high-pressure polyethylene reactor with an ultrasonic descaling device, which comprises the following steps:
(1) Providing a tubular high-pressure polyethylene reactor with an ultrasonic descaling device; the device comprises a tubular reactor, a heat exchange jacket and an ultrasonic descaling device consisting of an on-line monitoring control system, a sensor and a transducer; the sensor and the transducer are arranged on the sleeve type reactor, the ultrasonic generator and the sensor are connected with the on-line monitoring control system, and the transducer is connected with the ultrasonic generator; the transducer is used for generating ultrasonic waves;
(2) The temperature and pressure signals of the materials at the inner side and the outer side of the tubular reactor are monitored on line and in real time through a sensor,
(3) Phase equilibrium state and reaction of materials inside reaction tube are predicted in real time through signals acquired by processing sensorsReal-time heat transfer coefficient K of pipe 0 Calculating ideal heat transfer coefficient K of reaction tube i And predicting the fouling thermal resistance R of the reaction tube according to the following formula f
(4) When 1/R f ≥9K i The ultrasonic descaling device is not started, when the ratio is 1/R f <3K i And starting the ultrasonic descaling device.
Preferably, when 1/R f At 3K i ～9K i And when the ultrasonic descaling device is in a current state, the ultrasonic descaling device is maintained. The invention staggers the start-stop judging conditions of the ultrasonic descaling device, so that the ultrasonic descaling device can intermittently operate, and the operation energy consumption of the ultrasonic descaling device is further reduced on the premise of ensuring the descaling effect.
Preferably, the tubular reactor comprises an inner tube and an outer tube, wherein the tubular reactor consists of a reaction tube and a jacket wrapping the reaction tube, the reaction tube is the inner tube of the tubular reactor, and the jacket is the outer tube of the tubular reactor. The inner material of the tubular reactor refers to the material in the inner tube, and the outer material of the tubular reactor refers to the heat exchange medium material in the jacket.
In a preferred embodiment of the invention, the inner diameter of the inner tube of the tubular process high pressure polyethylene reactor is 10-100mm, preferably 30-80mm.
In a preferred embodiment of the invention, the tubular process high pressure polyethylene reactor comprises at least 3 free radical initiator feed openings, preferably 3-6 free radical initiator feed openings in total, at different positions along the longitudinal direction of the reactor.
In a preferred embodiment of the invention, the tubular process high pressure polyethylene reactor comprises at least 3 ultrasound transducers, preferably 3-12 ultrasound transducers in total, at different positions along the longitudinal direction of the reactor.
In a preferred embodiment of the invention, the ultrasonic transducer is downstream of the radical initiator feed inlet, preferably the ultrasonic transducer is at a distance of 0.1 to 20m from the radical initiator feed inlet.
In the tubular high-pressure polyethylene reactor, heat released by the reaction of materials is partially absorbed by heat exchange water, the materials and the heat exchange water carry out heat transfer in a countercurrent or parallel flow mode, a sensor is arranged in the reactor, the sensor is connected with an on-line monitoring control system, and the on-line monitoring control system comprises a data acquisition module, a phase balance calculation module, a dirt thermal resistance calculation module and a feedback control module; the output data of the sensor is collected, stored and output through a data acquisition module, and then the industrial value K of the material balance state parameter and the heat transfer coefficient in the tubular high-pressure polyethylene reactor is obtained through calculation of a phase balance calculation module and a dirt thermal resistance calculation module 0 Ideal value K of heat transfer coefficient i Fouling thermal resistance R of reactor f The method comprises the steps of carrying out a first treatment on the surface of the Finally, the feedback control module respectively adjusts and controls the temperature of the heat exchange water inlet and the running states of the ultrasonic generator and the transducer according to judgment, thereby achieving the purpose of on-line monitoring and control, reducing the running load of the ultrasonic generator and the transducer and achieving the purpose of energy conservation.
The data acquisition module collects and stores the operation parameters of the reactor and the jacket output by the sensor, and respectively outputs the data after finishing to the phase balance calculation module and the dirt thermal resistance calculation module.
The on-line monitoring control system obtains an ideal heat transfer coefficient K in the tubular reactor through processing temperature and pressure data of materials in the tubular reactor and heat exchange media in a heat exchange jacket, data of polymer molecular weight, branching degree and the like obtained through off-line analysis, and the like, wherein the temperature and pressure data are collected by a sensor i The method comprises the steps of carrying out a first treatment on the surface of the The on-line monitoring control system obtains a real-time heat transfer coefficient K by processing temperature data of the medium in the tubular reactor and the heat exchange jacket, which are acquired by the sensor 0 Then calculating to obtain the dirt thermal resistance R of the reactor f . Specifically, in-line polymer concentration, molecular weight, branching degree, material flow rate, density, specific heat, etc. can be determined by modeling the tubular reactor, and then based on an empirical model orThe mechanism model calculates the real-time heat transfer coefficient and ideal heat transfer coefficient of the convection inside and outside the tube.
The phase balance calculation module processes the material temperature and pressure data output by the data acquisition module, calculates the phase balance of the tubular high-pressure polyethylene reactor by using a PC-SAFT state equation and a POLYMIX algorithm to obtain material balance parameters at any time and at a tube side in the reactor, compares the phase separation pressure at any time and at the tube side of the reactor with the actual operation pressure of the reactor to judge whether the material generates phase separation, feeds back the result output by the phase balance calculation module to the heat exchange water inlet temperature, regulates and controls the heat exchange water inlet temperature, and prevents the material phase separation deposition in the reactor from forming dirt.
The dirt thermal resistance calculation module is used for processing the material output by the sensor and the temperature of the heat exchange water inlet and outlet to obtain an industrial value K of the heat transfer coefficient in the tubular high-pressure polyethylene reactor 0 Simultaneously processing to obtain the convection heat transfer coefficient of the material, the convection heat transfer coefficient of the heat exchange water and the heat transfer coefficient of the reactor metal tube, and calculating to obtain an ideal value K of the heat transfer coefficient i By the formula:
calculating to obtain the dirt thermal resistance R of the reactor f When 1/R f ≥9K i The ultrasonic generator and transducer do not need to operate when 1/R f <3K i The ultrasonic generator and the transducer work, and the ultrasonic generator and the transducer intermittently operate through on-line monitoring of dirt thermal resistance, so that the aim of saving energy is fulfilled.
Preferably, the output power of the transducer is 0.5-50kW, and the output ultrasonic frequency is 20-100kHz.
Compared with the prior art, the invention has the following advantages:
(1) The scale removal effect is obvious by controlling the intermittent operation of the ultrasonic generator and the transducer and controlling the temperature of the heat exchange water inlet, so that the heat transfer of materials and heat exchange water in the reactor can always keep the highest efficiency;
(2) The ultrasonic waves destroy the boundary layer generated when the materials flow, and reduce the flow resistance, so that the heat transfer coefficient is increased, the heat exchange effect is improved, and the damage to the boundary layer is also inhibited from forming dirt;
(3) The reaction system does not need to stop to treat dirt, and dirt can be cleaned on line by intermittently operating the ultrasonic generator and the transducer and regulating and controlling the temperature of the heat exchange water inlet, and the descaling effect is good;
(4) The online monitoring control system composed of the data acquisition module, the phase balance calculation module, the dirt thermal resistance calculation module and the feedback control module can monitor the heat exchange coefficient, the phase balance and the dirt thermal resistance of the reaction system in real time, and can feed back monitoring results to the ultrasonic generator, the transducer and the temperature of the heat exchange water inlet;
(5) The on-line monitoring control system formed by the data acquisition module, the phase balance calculation module and the dirt thermal resistance calculation module can enable the ultrasonic generator and the transducer to intermittently operate, and can regulate and control the temperature of the heat exchange water inlet;
(6) The ultrasonic generator and the transducer are operated intermittently, so that the energy consumption is low, the operation cost is low, the purpose of energy conservation is effectively achieved, and meanwhile, the service lives of the ultrasonic generator and the transducer are prolonged due to intermittent operation.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a flow chart of the invention in normal operation;
the labels of fig. 1 are illustrated as follows:
1-a tubular reactor; 2-a heat exchange jacket; 3-material inlet; 4-a material outlet; 5-a heat exchange water inlet; 6-a heat exchange water outlet; 7-transducers; 8-a sensor; 9-conducting wires; 10-an ultrasonic generator; 11-an on-line monitoring control system; 12-side feed inlet.
Detailed Description
While the invention has been described with reference to exemplary embodiments, those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include embodiments falling within the scope of the appended claims. The invention is described in further detail below with reference to the accompanying drawings, and specific embodiments thereof are shown.
As shown in figure 1, the ultrasonic descaling device of the tubular high-pressure polyethylene reactor comprises a tubular high-pressure polyethylene reactor 1, a heat exchange jacket 2, an ultrasonic generator 10 and a plurality of transducers 7, wherein the ultrasonic generator 10 is connected with the transducers 7 through wires 9, the reactor 1 is provided with a material inlet 3, a material outlet 4 and a lateral line feeding port 12, a heat exchange water inlet 5 and a heat exchange water outlet 6 are arranged between the heat exchange jacket 2 and the reactor 1, and the material and heat exchange water exchange in a countercurrent or parallel flow manner. The plurality of sensors 8 are arranged on the reactor 1, are connected with an on-line monitoring control system 11 through wires, and the ultrasonic generator 10 is connected with the on-line monitoring control system 11.
As shown in fig. 2, the flow of the invention in normal operation is that a sensor monitors the operation parameters of materials in a tubular reactor and materials in a jacket in real time and outputs the parameters to an on-line monitoring control system, and the on-line monitoring control system controls the temperature of a heat exchange water inlet and controls intermittent operation of an ultrasonic generator and an energy converter through data acquisition and analysis of the sensor.
The device comprises a data acquisition module, a phase balance calculation module, a dirt thermal resistance calculation module and a feedback control module;
the output data of the sensor is collected, stored and output through a data acquisition module, and then the industrial value K of the material balance state parameter and the heat transfer coefficient in the tubular high-pressure polyethylene reactor is obtained through calculation of a phase balance calculation module and a dirt thermal resistance calculation module 0 Ideal value K of heat transfer coefficient i Fouling thermal resistance R of reactor f The method comprises the steps of carrying out a first treatment on the surface of the And finally, the feedback control module respectively regulates and controls the temperature of the heat exchange water inlet and the running states of the ultrasonic generator and the transducer according to judgment, so as to realize on-line monitoring regulation and control.
The energy converter has the excellent characteristics of high output power, wide working frequency band, wide range, high transmission efficiency, high energy density and the like, has high descaling efficiency, meets the descaling requirement, is excellent in performance, and at least one energy converter is connected with the outer wall of the tubular high-pressure polyethylene reactor, and removes the dirt deposited and attached on the inner wall of the reactor through the propagation of ultrasonic waves along the reactor wall so as to achieve the purposes of descaling and preventing scaling; the ultrasonic generator converts the electric energy into mechanical energy, and the mechanical energy is converted into acoustic energy;
in the tubular high-pressure polyethylene reactor, a plurality of sensors are arranged, the sensors are connected with an on-line monitoring feedback system, and the operating states of a hot water inlet temperature exchange device, an ultrasonic generator and a transducer are regulated and controlled to achieve the purposes of high-efficiency descaling and energy saving;
the data acquisition module collects and stores the operation parameters of the reactor and the jacket output by the sensor, and respectively outputs the data after finishing to the phase balance calculation module and the dirt thermal resistance calculation module.
The phase balance calculation module processes the data output by the sensor to obtain a material balance phase diagram at any time and at a tube side in the reactor, judges whether the material generates phase separation, and accordingly performs feedback adjustment on the temperature of the heat exchange water inlet to prevent the material in the reactor from depositing in a phase separation mode to form dirt;
the dirt thermal resistance calculation module processes the data output by the sensor to obtain an industrial value K of the heat transfer coefficient in the tubular high-pressure polyethylene reactor 0 And an ideal value K of the heat transfer coefficient i Then calculating to obtain the dirt thermal resistance R of the reactor f . In this embodiment, the basis for determining the feedback control module is: when 1/R f ≥9K i The ultrasonic generator and transducer do not need to operate when 1/R f <3K i The ultrasonic generator and the transducer work, and the ultrasonic generator and the transducer intermittently operate through on-line monitoring of dirt thermal resistance, so that the aim of saving energy is fulfilled.
According to the invention, the parameters of materials and heat exchange water of the tubular high-pressure polyethylene reactor are monitored in real time, the parameters of the reactor in normal operation are fed back and regulated through the phase balance calculation module and the dirt thermal resistance calculation module, the temperature of the heat exchange water inlet is regulated and controlled, and the intermittent operation of the ultrasonic generator and the transducer is controlled, so that the efficient descaling can be realized, the high heat exchange efficiency of the reactor and the heat exchange jacket is ensured all the time, and the conditions of shortened service life and energy waste of the ultrasonic generator and the transducer caused by continuous operation can be avoided.
Example 1
The ultrasonic descaling device shown in figure 1 is adopted to intermittently scale the high-pressure polyethylene device with the annual production of 6 ten thousand tons in a tubular method. The tubular reactor is of a sleeve structure, and 3 initiator feed inlets and 6 ultrasonic transducers are longitudinally arranged along the reactor. The materials in the reaction tube are ethylene and low density polyethylene, and the outside of the reaction tube, namely the jacket material of the reactor, is hot water. The temperature of the materials in the reaction tube is 150-330 ℃, and the feeding temperature of hot water in the jacket of the reactor is 160 ℃. The dirt thermal resistance calculation module of the online monitoring system processes the data acquired by the sensor to obtain an industrial value K of the heat transfer coefficient in the tubular high-pressure polyethylene reactor 0 Ideal value K of heat transfer coefficient i And thermal resistance to dirt R f . When 1/R f ≥9K i The ultrasonic generator and transducer are stopped when 1/R f <3K i The sonotrode and transducer are activated. The frequency of the ultrasonic transducer was 30kHz and the total power was 9kW. After one month of continuous operation, the tubular reactor produced 6.32 ten thousand tons/year, which was 5.3% higher than comparative example 1.
Example 2
The ultrasonic descaling device shown in figure 1 is adopted to intermittently scale the high-pressure polyethylene device with the annual production of 6 ten thousand tons in a tubular method. The tubular reactor is of a sleeve structure, and 3 initiator feed inlets and 6 ultrasonic transducers are longitudinally arranged along the reactor. The materials in the reaction tube are ethylene and low density polyethylene, and the outside of the reaction tube, namely the jacket material of the reactor, is hot water. The temperature of the materials in the reaction tube is 150-330 ℃, and the feeding temperature of hot water in the jacket of the reactor is 160 ℃. The dirt thermal resistance calculation module of the online monitoring system processes the data acquired by the sensor to obtain the tubular method high-pressure polyethylene reactor internal transmissionIndustrial value of thermal coefficient K 0 Ideal value K of heat transfer coefficient i And thermal resistance to dirt R f . When 1/R f ≥9K i The ultrasonic generator and transducer are stopped when 1/R f <3K i The ultrasonic generator and the transducer are started to work, the frequency of the ultrasonic transducer is 20kHz, and the total power is 9kW. In comparative example 1, the operation time period of the ultrasonic generator and the transducer was increased. After one month of continuous operation, the tubular reactor produced 6.21 ten thousand tons/year, 3.5% higher than comparative example 1.
Example 3
The ultrasonic descaling device shown in figure 1 is adopted to intermittently scale the high-pressure polyethylene device with the annual production of 6 ten thousand tons in a tubular method. The tubular reactor is of a sleeve structure, materials in the reaction tube are ethylene and low-density polyethylene, and hot water is used as materials outside the reaction tube, namely a jacket of the reactor. The temperature of the materials in the reaction tube is 150-330 ℃, and the feeding temperature of hot water in the jacket of the reactor is 160 ℃. The dirt thermal resistance calculation module of the online monitoring system processes the data acquired by the sensor to obtain an industrial value K of the heat transfer coefficient in the tubular high-pressure polyethylene reactor 0 Ideal value K of heat transfer coefficient i And thermal resistance to dirt R f . When 1/R f ≥9K i The ultrasonic generator and transducer are stopped when 1/R f <3K i And starting the ultrasonic generator and the transducer to work, wherein the frequency of the ultrasonic transducer is 30kHz, and the total power is 3kW. In comparative example 1, the operating time period of the ultrasonic generator and transducer was increased, and the operating time period was also increased as compared with example 2. After one month of continuous operation, the tubular reactor produced 6.10 ten thousand tons/year, which was 1.67% higher than that of comparative example 1.
Example 4
The ultrasonic descaling device shown in figure 1 is adopted to intermittently scale the high-pressure polyethylene device with the annual production of 6 ten thousand tons of pipe method, and meanwhile, the temperature of the heat exchange water inlet is controlled through the phase balance calculation module. The tubular reactor is of a sleeve structure, materials in the reaction tube are ethylene and low-density polyethylene, and hot water is used as materials outside the reaction tube, namely a jacket of the reactor. Material temperature in reaction tubeThe initial feeding temperature of hot water in the jacket of the reactor is 160 ℃, the inlet temperature is controlled by a phase balance calculation module, and when the actual pressure of the material is higher than the phase separation pressure, the inlet temperature of the hot water is increased. The dirt thermal resistance calculation module of the online monitoring system processes the data acquired by the sensor to obtain an industrial value K of the heat transfer coefficient in the tubular high-pressure polyethylene reactor 0 Ideal value K of heat transfer coefficient i And thermal resistance to dirt R f . When 1/R f ≥9K i The ultrasonic generator and transducer are stopped when 1/R f <3K i The ultrasonic generator and the transducer are started to work, the frequency of the ultrasonic transducer is 30kHz, and the total power is 9kW. After one month of continuous operation, the tubular reactor produced 6.39 ten thousand tons/year, which was 6.5% higher than comparative example 1.
Comparative example 1
In this example, an ultrasonic descaling device was not used, and the other conditions were the same as in example 1, except that the annual yield of polyethylene was 6 ten thousand tons/year.
Comparative example 2
In this example, an ultrasonic descaling device was continuously used, the ultrasonic generator and transducer were continuously operated, the frequency of the ultrasonic transducer was 30kHz, the total power was 4kW, and the other conditions were the same as in example 1. Compared with the example 1, after continuous operation for one month, the tubular reactor has the capacity of 6.3 ten thousand tons/year, the capacity is equivalent, but the energy consumption of the ultrasonic descaling device is increased by 200 percent.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. The operation method of the tubular high-pressure polyethylene reactor with the ultrasonic descaling device is characterized by comprising the following steps of:
(1) Providing a tubular high-pressure polyethylene reactor with an ultrasonic descaling device; the device comprises a tubular reactor (1), a heat exchange jacket (2) and an ultrasonic descaling device consisting of an on-line monitoring control system (11), an ultrasonic generator (10), a sensor (8) and a transducer (7); the sensor (8) and the transducer (7) are arranged on the sleeve-type reactor, the ultrasonic generator (10) and the sensor (8) are connected with the on-line monitoring control system (11), and the transducer (7) is connected with the ultrasonic generator (10); the transducer (7) is used for generating ultrasonic waves;
(2) The temperature and pressure signals of the materials at the inner side and the outer side of the tubular reactor are monitored on line and in real time through a sensor,
(3) Real-time prediction of the phase equilibrium state of the material inside the reaction tube by processing the signals acquired by the sensors i The material phase balance state parameters predicted by the online monitoring control system (11) are used for adjusting the temperature of a heat exchange water inlet;
the on-line monitoring control system processes the data acquired by the sensor (8) and adjusts the operating parameters of the reaction tube clamp sleeve and the operating states of the ultrasonic generator (10) and the transducer (7); the on-line monitoring control system (11) calculates the phase balance of the materials in the tubular reactor (1) to obtain a material balance state parameter; the online monitoring control system (11) obtains an ideal value K of the heat transfer coefficient in the tubular reactor (1) through processing temperature and pressure data of materials in the tubular reactor (1) and heat exchange medium in the heat exchange jacket (2) acquired by the sensor (8) and offline analyzing the obtained polymer molecular weight and branching degree data i The method comprises the steps of carrying out a first treatment on the surface of the The on-line monitoring control system (11) obtains an industrial value K of the heat transfer coefficient by processing temperature data of the medium in the tubular reactor (1) and the heat exchange jacket (2) acquired by the sensor (8) 0 And calculating the fouling thermal resistance R of the reaction tube according to the following formula f :
(4) When 1/R f ≥9K i The ultrasonic descaling device is not started, when the ratio is 1/R f <3K i And starting the ultrasonic descaling device.
2. The method of operation of claim 1, wherein: the output power of the transducer (7) is 0.5-50kW, and the output ultrasonic frequency is 20-100kHz.
3. The method of operation of claim 1, wherein: at least one sensor (8) is distributed on the tubular reactor (1) and is connected with an on-line monitoring control system (11) to collect and store real-time information of materials in the reaction tube and materials sleeved on the reaction tube.
4. The method of operation of claim 1, wherein: the on-line monitoring control system (11) controls the intermittent operation of the ultrasonic descaling device.
5. The method of operation of claim 1, wherein: the online monitoring control system comprises a data acquisition module, a phase balance calculation module, a dirt thermal resistance calculation module and a feedback control module;
the output data of the sensor is collected, stored and output through a data acquisition module, and then the industrial value K of the material balance state parameter and the heat transfer coefficient in the tubular high-pressure polyethylene reactor is obtained through calculation of a phase balance calculation module and a dirt thermal resistance calculation module 0 Ideal value K of heat transfer coefficient i Fouling thermal resistance R of reactor f The method comprises the steps of carrying out a first treatment on the surface of the And finally, judging by the feedback control module, and respectively regulating and controlling the temperature of the heat exchange water inlet and the running states of the ultrasonic generator and the transducer to realize on-line monitoring and regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210265598.1A CN114602392B (en) | 2022-03-17 | 2022-03-17 | Operation method of tubular high-pressure polyethylene reactor with ultrasonic descaling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210265598.1A CN114602392B (en) | 2022-03-17 | 2022-03-17 | Operation method of tubular high-pressure polyethylene reactor with ultrasonic descaling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114602392A CN114602392A (en) | 2022-06-10 |
| CN114602392B true CN114602392B (en) | 2023-06-06 |
Family
ID=81865208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210265598.1A Active CN114602392B (en) | 2022-03-17 | 2022-03-17 | Operation method of tubular high-pressure polyethylene reactor with ultrasonic descaling device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114602392B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4431177A1 (en) | 2023-03-13 | 2024-09-18 | Borealis AG | Process for reducing fouling in high pressure polymerization |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202057608U (en) * | 2011-04-07 | 2011-11-30 | 青岛海洋地质研究所 | Hydrate phase equilibrium in-situ monitoring experiment device |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3981793A (en) * | 1975-06-30 | 1976-09-21 | Phillips Petroleum Company | Automatic control of a hydrocracker |
| WO2012084772A1 (en) * | 2010-12-22 | 2012-06-28 | Basell Polyolefine Gmbh | Process for monitoring the polymerization of ethylene or ethylene and comonomers in a tubular-reactor at high-pressures |
| CN204699440U (en) * | 2015-04-29 | 2015-10-14 | 中国石油天然气集团公司 | A kind of MVR evaporation and crystallization system of antiscaling, descaling |
| CN105674792B (en) * | 2016-01-22 | 2017-12-15 | 青岛科技大学 | A kind of ultrasound wave descaling method with feedback regulation function and Evaluation on Energy Saving function |
| CN205966632U (en) * | 2016-01-22 | 2017-02-22 | 青岛科技大学 | Ultrasonic wave descaling ware |
| CN106799344B (en) * | 2017-03-10 | 2022-03-08 | 辽宁骏升科技有限公司 | Stepping type power ultrasonic strong pulse scale prevention and removal device and control method |
| CN107703275B (en) * | 2017-11-13 | 2023-11-17 | 中国石油化工股份有限公司 | High-pressure experimental device and method for methane hydrate phase balance research |
| CN110762752A (en) * | 2019-10-16 | 2020-02-07 | 青岛海尔空调电子有限公司 | Ultrasonic defrosting and descaling device and method for controlling same |
| CN112705114B (en) * | 2019-10-24 | 2022-11-15 | 中国石油化工股份有限公司 | Heat exchange type multiphase reactor, application method thereof and light gasoline etherification method |
| CN111589394A (en) * | 2020-06-30 | 2020-08-28 | 江苏京控装备有限公司 | Ultrasonic homogeneous single-tube reactor |
| CN112250780B (en) * | 2020-10-19 | 2021-09-07 | 浙江大学 | Method for high pressure olefin polymerization |
| CN112759017B (en) * | 2021-02-06 | 2024-11-01 | 上海兴全电力技术有限公司 | Efficient scale-resistant and heat exchange plate-reinforced falling film evaporation system and application method thereof |
| CN113000498A (en) * | 2021-03-01 | 2021-06-22 | 浙江大学 | Cleaning method for high-pressure tubular polyethylene reaction system |
| CN113004439B (en) * | 2021-03-03 | 2022-05-31 | 浙江大学 | Method for inhibiting polymerization of ethylene in compressor equipment in production process of low-density polyethylene |
| CN112973575A (en) * | 2021-03-22 | 2021-06-18 | 浙江大学 | High-pressure tubular reactor and operation method thereof |
| CN113145017B (en) * | 2021-04-01 | 2023-01-10 | 浙江大学 | Tubular reactor for ethylene polymerization |
-
2022
- 2022-03-17 CN CN202210265598.1A patent/CN114602392B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202057608U (en) * | 2011-04-07 | 2011-11-30 | 青岛海洋地质研究所 | Hydrate phase equilibrium in-situ monitoring experiment device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114602392A (en) | 2022-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114602392B (en) | Operation method of tubular high-pressure polyethylene reactor with ultrasonic descaling device | |
| CN102755997A (en) | Safe and energy-saving control device and control method of hot rolling high-pressure descaling system | |
| KR101424905B1 (en) | Water-injection control device in rolling line, water-injection control method, water-injection control program | |
| TW200940207A (en) | Method for regulating the secondary cooling system of continuous casting machines | |
| US6235852B1 (en) | Optimization of a cooling water system of a polyolefin production unit | |
| WO2013170597A1 (en) | Hydraulic power station surge shaft agc control method | |
| CN105674792B (en) | A kind of ultrasound wave descaling method with feedback regulation function and Evaluation on Energy Saving function | |
| CN102791369A (en) | Polyethylene manufacturing system and method | |
| CN105710091A (en) | High-pressure air-water type numerically-controlled pulse cleaning system | |
| CN116928947B (en) | Electric vibrating table moving coil cooling system and method based on multi-sensor fusion | |
| CN206113751U (en) | Intelligence supersound scale control heat exchanger | |
| CN112588424B (en) | Ball milling and pulverizing system effective control method based on cloud intelligent model | |
| CN206747150U (en) | A kind of hinge type ultrasound wave descaling and sound composite cleaning system | |
| CN113023873B (en) | Intelligent management system and method for sewage treatment | |
| CN212433053U (en) | Steam pipeline system | |
| CN113145017B (en) | Tubular reactor for ethylene polymerization | |
| CN114358417A (en) | Energy-saving consumption-reducing operation control method for industrial circulating cooling water system | |
| CN215521212U (en) | Steam recovery system in cold hydrogenation | |
| CN109678819B (en) | Optimized energy production method of diketene | |
| CN210683205U (en) | Hydrogen chloride synthetic furnace byproduct steam recycle system | |
| CN111536699A (en) | Method and device for automatically increasing water flow of gas water heater | |
| CN205966632U (en) | Ultrasonic wave descaling ware | |
| CN1687686A (en) | Intelligent controlled heat exchanger | |
| CN217896646U (en) | Mute non-negative pressure water supply equipment | |
| CN217498861U (en) | Detection and energy-saving control device for hardness treatment of water softener |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |