CN114904289B - R142b reactor heavy component zero manual steaming method and steaming device thereof - Google Patents
R142b reactor heavy component zero manual steaming method and steaming device thereof Download PDFInfo
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- CN114904289B CN114904289B CN202210608841.5A CN202210608841A CN114904289B CN 114904289 B CN114904289 B CN 114904289B CN 202210608841 A CN202210608841 A CN 202210608841A CN 114904289 B CN114904289 B CN 114904289B
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- 238000010025 steaming Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000010992 reflux Methods 0.000 claims abstract description 48
- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 12
- 238000007710 freezing Methods 0.000 claims abstract description 7
- 230000008014 freezing Effects 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 230000006641 stabilisation Effects 0.000 claims abstract description 5
- 238000011105 stabilization Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 12
- 238000004821 distillation Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 6
- 101000723939 Mus musculus Transcription factor HIVEP3 Proteins 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000001704 evaporation Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000008020 evaporation Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000007405 data analysis Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- ATEBGNALLCMSGS-UHFFFAOYSA-N 2-chloro-1,1-difluoroethane Chemical compound FC(F)CCl ATEBGNALLCMSGS-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/009—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping in combination with chemical reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
-
- 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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The application provides a method and a device for removing a heavy component of an R142b reactor by zero manual evaporation, wherein the method comprises the following steps: starting a steaming kettle program, and starting up self-checking by advanced control software (APC) to confirm that the accident tower unit runs normally; closing the reactor feeds; the steam control and stability maintain the reaction temperature, the pressure at the top of each reflux tower is reduced to the pressure at the top of the first tower of the rectifying tower unit at a first preset time, and the control and stability of a freezing salt water valve of the reflux tower are regulated to maintain the backwater temperature; steam control and stabilization are carried out to maintain the reaction temperature and maintain the temperature for a second preset time; closing steam, switching a valve to discharge the material from the reflux tower, and sending the material into an accident tower unit, wherein the pressure at the top of the reflux tower is reduced to 0Mpa at a constant speed for a third preset time; starting steam, and keeping the steam to be stable at a preset temperature to wait for starting. The application adopts sequential control technology to automatically steam and remove heavy components in a program-controlled manner, and the steam kettle process does not need manual adjustment, thereby reducing the influence on the rear-end rectification, ensuring the stability of the quality of the final rectification product, improving the utilization rate of the catalyst, reducing the catalyst loss and reducing the production cost.
Description
Technical Field
The application relates to the technical field of R142b production, in particular to a zero-component manual evaporation method for a heavy component of an R142b reactor. And also relates to a distillation device applied to the R142b reactor heavy component zero manual distillation method.
Background
R142b is also called chlorodifluoroethane, has a chemical formula of C2H2ClF2, can be used as a raw material of high-performance functional fluorine-containing polymer PVDF, is mainly used as a refrigerant, a foaming agent, an intermediate for producing vinylidene fluoride, a temperature controller medium and an aviation propellant, belongs to hydrochlorofluorocarbons, and is one of important chemical raw materials.
In the later operation period of the R142b reactor, as heavy components gradually accumulate and increase in the reactor, the relative catalyst concentration gradually decreases, the catalytic effect decreases, the heating medium consumption can only be gradually increased in production, the reaction temperature is increased to maintain the same output, the energy waste is caused, and the efficiency of a production device is reduced.
At present, aiming at the problem of reduced catalytic effect caused by heavy component accumulation, a production workshop generally adopts a manual steaming kettle to steam and remove the heavy component, namely, the reactor is manually operated at high temperature and low pressure, a reaction discharge outlet is changed, and the heavy component is steamed out to a heavy component treatment unit; or the bottom of the reactor is discharged, and heavy components accumulated in the bottom of the reactor are released.
However, the operation times of the manual steaming kettle are up to about 150 times, the whole process lasts about 8 hours, the operation steps are complex, the labor intensity is high, the mistakes are easy to occur, and the safety is poor. In the bottom discharge method of the reactor, part of the catalyst is carried out together in the discharge process, so that waste, incomplete discharge of heavy components, high risk in the discharge process and possible production accidents and environmental accidents are caused.
Disclosure of Invention
The application provides a zero-component manual steaming method and a steaming device for an R142b reactor, which realize automatic control of a steaming kettle, and have the advantages of simple operation, low labor intensity, good safety, high catalyst utilization rate, low production cost, contribution to improving the product quality and realization of R142b mass production.
The application provides a zero manual evaporation method for a heavy component of an R142b reactor, which comprises the following steps:
starting a steaming kettle program, and starting up self-checking by advanced control software (APC) to confirm that the accident tower unit runs normally;
closing the reactor feeds;
the steam control and stability maintain the reaction temperature, the pressure at the top of each reflux tower is reduced to the pressure at the top of the first tower of the rectifying tower unit at a first preset time, and the control and stability of a freezing salt water valve of the reflux tower are regulated to maintain the backwater temperature;
steam control and stabilization are carried out to maintain the reaction temperature and maintain the temperature for a second preset time;
closing steam, switching a valve to discharge the material from the reflux tower, and sending the material into an accident tower unit, wherein the pressure at the top of the reflux tower is reduced to 0Mpa at a constant speed for a third preset time;
starting steam, and keeping the steam to be stable at a preset temperature to wait for starting.
In some embodiments, the judging condition that the accident tower unit is normal is that: the accident tower pump is running and the fan is running.
In some embodiments, the method further comprises the step of judging the overpressure accident of the accident tower unit, and comprises the following steps:
detecting whether the top of the accident tower unit runs or not when steaming the kettle;
reading a pressure gauge reading at the top of the accident tower unit under the state that a program-controlled switch of the steam kettle is opened;
judging whether the accident tower unit is positive pressure currently or not;
and when the pressure gauge at the top of the accident tower unit shows positive pressure, closing the steam and a pipeline leading to the accident tower unit, and suspending the sequential control procedure of the steaming kettle.
In some embodiments, the steps of: and starting a steaming kettle program, and before starting up the self-checking by advanced control software (APC) to confirm that the accident tower unit operates normally, further comprising the steps of:
analyzing and sorting historical operation data of the steam kettle by utilizing a database of advanced control software and a trend checking module, and sorting out the working steps of the steam kettle;
quantifying temperature and duration parameters of each step in the steaming kettle process;
an accident automatic processing module is configured to prevent overpressure and ensure the safety of the steaming kettle process;
and determining the sequential control running environment by utilizing a script module in advanced control software.
In some embodiments, the steps of: when the pressure gauge at the top of the accident tower unit shows positive pressure, the method further comprises the steps of:
DCS system popup window and overpressure alarm.
In addition, the application also provides a device which is applied to the R142b reactor heavy component zero manual distillation method, and comprises the following steps:
at least one reactor, wherein a catalyst is arranged in each reactor and is connected with a raw material conveying pipeline, an electromagnetic valve is arranged on the raw material conveying pipeline, and a temperature sensor for measuring the reaction temperature is arranged in each reactor;
at least one reflux tower is arranged in one-to-one correspondence with each reactor and is used for carrying out preliminary rectification on the reaction discharge, and a pressure gauge used for measuring the pressure at the top of the tower is arranged in each reflux tower;
the rectifying tower unit is connected with all the reflux towers through pipelines and is used for rectifying and purifying the primarily rectified materials;
the accident tower unit is used for absorbing and treating the recombinant components;
the APC controller is used for controlling the reaction temperature of each reactor according to a sequential control program;
and the DCS control system is used for controlling the operation of each electromagnetic valve according to a temperature control program.
In some embodiments, the system further comprises an overpressure alarm connected with the DCS control system and used for sounding an alarm when the pressure at the top of the reflux tower exceeds a preset value.
Compared with the traditional manual steaming kettle, the application adopts the sequential control technology to automatically steam and remove the heavy components generated in the R142b reactor, thereby realizing the automatic control of the steam and remove the heavy components, avoiding the waste of the catalyst caused by the discharge of the catalyst from the bottom of the reactor, improving the utilization rate of the catalyst and reducing the production cost. The steaming kettle process does not need manual adjustment, reduces labor intensity, program-controlled automatic operation, effectively reduces the influence on the rear-end rectification, ensures the stability and uniformity of the quality of the final rectification product, ensures finer and smoother product production, improves the product quality, and is easy to realize the batch production of R142 b.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for zero manual distillation of the heavy components of an R142b reactor provided by the application;
FIG. 2 is a logic diagram of the automatic determination of an accident tower unit overpressure accident in the present application;
FIG. 3 is a schematic diagram of an R142b reactor according to the present application.
Wherein, 1-reactor, 2-reflux tower, 3-rectifying tower unit, 4-accident tower unit.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The present application will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present application.
Referring to fig. 1, fig. 1 is a flow chart of a method for removing a heavy component of an R142b reactor by manual distillation.
The application provides a zero-component manual steaming method for an R142b reactor, which comprises the following steps:
s101, starting a steaming kettle program, and starting up self-checking by advanced control software (APC) to confirm that the accident tower unit 4 runs normally;
s102, closing the feeding of each reactor 1;
s103, steam stability control is carried out to maintain the reaction temperature, the jacking pressure of each reflux tower 2 is reduced to the initial tower top pressure of the rectifying tower unit 3 at a first preset time, and a freezing salt water valve of the reflux tower is regulated to maintain the backwater temperature;
s104, steam control and stabilization are carried out to maintain the reaction temperature and maintain the temperature for a second preset time;
s105, closing steam, switching a valve to discharge the material from the reflux tower 2, and sending the material into the accident tower unit 4, wherein the reflux tower 2 is pressed for a third preset time to uniformly reduce the pressure to 0Mpa;
s106, starting steam, and keeping the steam at a preset temperature stably to wait for starting.
The two raw material monomers enter a jacketed reactor 1 heated by steam, the reaction is carried out in the reactor 1, and the reaction discharge is subjected to preliminary rectification by a reflux tower 2. During normal production, the crude product at the top of the reflux tower 2 is sent to a rectifying tower unit 3 for further rectification and purification to produce an R142b finished product, and a pipeline of the accident tower unit 4 is closed; and when the kettle is steamed, the top of the reflux tower 2 is steamed out of the recombination distribution accident tower unit 4, and the pipeline of the rectification tower unit 3 is closed.
In steps S101 and S102, the steamer sequential control program switch needs to be opened, and the feed adjusting valve and the shut-off valve need to be ensured to be closed simultaneously.
In step S103, the reaction temperature is maintained through steam stability control, the top pressure of the reflux tower 2 is reduced to the top pressure of the first tower of the rectifying tower unit 3 at a constant speed for 2 hours, and the backwater temperature is maintained through the stability control of a freezing salt water valve of the reflux tower 2.
Wherein, the steam control reaction temperature can realize stable self-control by means of an APC controller, a PID module and the like. The first tower of the rectifying tower unit 3 is an HCL rectifying tower, and the top pressure of the reflux tower 2 needs to be reduced to the top pressure of the HCL rectifying tower at a constant speed, and the preferential time is 2 hours. The temperature of the rectification feeding is controlled before the freezing brine in the reflux tower 2, and the temperature of the freezing brine backwater is controlled in the step.
In step S104, the reaction temperature is stabilized by steam, and the temperature is maintained for preferably 1 hour. Wherein, the stable reaction temperature of steam control can be stably controlled by means of an APC controller/PID module and the like. This step was maintained for 1 hour, allowing the reaction to proceed more thoroughly.
In step S105, the steam is turned off, the discharging of the reflux tower 2 is switched from the rectifying tower unit 3 to the accident tower unit 4, and the pressure of the reflux tower 2 is reduced to 0Mpa at a constant speed for 3 hours.
Wherein the reflux column 2 is discharged to start steaming and removing the components, and the components are sent to the accident column unit 4 for absorption treatment, and the components can be basically steamed and removed after being maintained for 3 hours.
S106, starting steam, and maintaining a certain temperature through steam control and stability to wait for starting. Wherein, the steam control reaction temperature can realize stable self-control by means of an APC controller/PID module and the like. The reaction temperature control target can be modified to further evaporate heavy components, and a certain temperature can be maintained to wait for starting.
The heavy component refers to a part of impurity components generated in the R142b reactor 1, such as R141b, and the like, and the reaction process cannot be distilled out of the reactor 1 due to the relatively high boiling point of the heavy component. In the application, the principle of pressure drop and boiling point drop is utilized, and the depressurization/heat preservation in the steam kettle is carried out in two stages: the first stage reduces the pressure in a small range, keeps the temperature and can fully react in the reactor 1 as much as possible, and the heavy components are rarely steamed out at the pressure and the temperature, so that the discharged materials of the reflux tower 2 are sent to a product rectifying unit, and the raw material waste is reduced; the depressurization and heat preservation in the second stage ensure the conditions of the evaporating pressure and temperature of the heavy components, the discharging of the reflux tower 2 is switched to the accident tower, and the evaporating heavy components are sent to the accident tower unit 4 for absorption treatment.
The control of the reaction temperature in each reactor 1 in the present application uses a model predictive control technique in advanced control software (APC). APC technology, known as advance process control, chinese is an advanced control technology. Through the steps of historical data analysis, mathematical model establishment and automatic controller establishment, a plurality of APC controllers of steam-reaction temperature are established, corresponding APC controller switches are turned on/off in each step by sequential control program, stable temperature control under different conditions is ensured, the whole process is unattended, the heavy components in the reactor 1 can be automatically steamed, accumulation of the heavy components is reduced, catalytic efficiency is improved, fluctuation of a rectifying unit at the rear end of the reaction is small, and product quality is uniform.
The normal operation judgment conditions of the accident tower unit 4 are as follows: the accident tower pump is running and the fan is running. The program is started up for self-checking, and the normal operation of the accident tower unit 4 is confirmed. And when the steaming kettle is operated, whether the accident tower unit 4 is operated is detected, and the operation is controlled in sequence, otherwise, the operation is not continued, so that the safe operation of the steaming kettle is ensured.
The accident tower unit 4 is in a safe state, and the fan needs to maintain a negative pressure state during normal operation. The steaming kettle process can cause positive pressure of the system and leakage of components to pollute the environment due to too fast or too much feeding of materials or failure of a fan and other devices, so that the positive pressure accident can be avoided by timely finding and rapidly processing.
As shown in fig. 2, fig. 2 is a logic diagram of automatic judgment of an accident tower unit overpressure accident in the present application.
S201: detecting whether the top of the accident tower unit 4 runs or not when steaming the kettle;
s202: reading a pressure gauge at the top of the accident tower unit 4 under the state that a program control switch of the steam kettle is opened;
s203: judging whether the accident tower unit 4 is positive pressure currently;
s204: when the pressure gauge at the top of the accident tower unit 4 shows positive pressure, the steam and the pipeline to the accident tower unit 4 are closed, and the sequence control procedure of the steaming kettle is stopped.
After the program control switch of the steam kettle is started, the steam kettle program starts to circularly run, whether the pressure of the accident tower is positive or not needs to be judged, once the pressure is exceeded, steam is closed and the pipeline of the accident tower is removed, and the material can be immediately stopped from being fed into the accident tower unit 4 by starting the program control pause switch of the steam kettle so as to lighten the pressure processed by the accident tower unit 4 and avoid the continuous positive pressure.
The accident tower overpressure module monitors the pressure of the accident tower in real time, and once the system is positive in pressure, the pressure can be reduced by immediately stopping feeding, so that the material leakage and environmental pollution caused by the positive pressure of the system are avoided. Meanwhile, the sequence control program is automatically suspended, and after the field condition is manually processed/confirmed, a pause switch is manually closed, and the steps are continuously executed downwards before the pause.
In the steps of: when the pressure gauge at the top of the accident tower unit 4 shows positive pressure, the method further comprises the steps of: DCS system popup window and overpressure alarm. The DCS system can be externally connected with an alarm, the DCS computer popup window alarms to remind an operator to check the state of the device on site, after the normal state is recovered, the steam kettle program control pause switch is closed, and the steam kettle program control can continue to execute subsequent operations.
Therefore, an automatic judging/automatic processing program module is provided for possible overpressure accidents, and the safety of system operation is further improved.
In the steps of: before starting the steaming kettle program and starting the advanced control software (APC) to perform self-check to confirm that the accident tower unit 4 is running normally, the method further comprises the steps of:
analyzing and sorting historical operation data of the steam kettle by utilizing a database of advanced control software and a trend checking module, and sorting out the working steps of the steam kettle;
quantifying temperature and duration parameters of each step in the steaming kettle process;
an accident automatic processing module is configured to prevent overpressure and ensure the safety of the steaming kettle process.
And determining the sequential control running environment by utilizing a script module in advanced control software.
Firstly, analyzing and sorting historical temperature and pressure data of a steaming kettle and trends of the historical temperature and pressure data by using a database and a trend checking module in advanced control software; secondly, combining with manual experience, summarizing general sequence steps of finishing the steaming kettle, and providing basic logic for sequential control writing; thirdly, by combining historical data, relevant indexes of each step in the steaming kettle process, such as time length, temperature and the like, are quantized, and a data basis is provided for index quantization in sequential control writing; then, an accident automatic processing module is provided for the possible overpressure problem in the steaming kettle process, so that the safety of the steaming kettle process is ensured; and finally, determining the sequential control operation environment through a script module in advanced control software.
The depressurization rate and the steaming kettle duration in the application can be obtained according to the analysis of historical big data, are suitable for devices with similar scales, ensure the stability of the devices, ensure the unification of the speed of the steaming kettle and standardize program control steps, and are summarized according to the historical behavior data of the operation standard, so that the sequential control safety realized by the logic is higher.
It should be noted that the running platforms for sequential control of the steaming kettle in the application can be multiple, and the APC script module is used as the sequential control running platform in the application. Alternatively, the operation platform may be a cis-control module of the DCS itself, or other control software accessed to the DCS through an OPC protocol. The quantitative index of each step of the sequential control of the steaming kettle is preferably but not limited to: reflux column 2 top pressure, reflux column 2 top pressure drop rate, reaction temperature, and temperature maintenance duration. For example, it may also be: the pressure at other positions is reduced by a fixed amplitude for a certain steam flow maintaining time period and the like. The quantization index control target is suitable for similar scale devices, and other scale devices are adjusted on the basis.
Referring to fig. 3, fig. 3 is a schematic diagram of an R142b reactor provided by the present application.
In addition, the application also provides a distillation device which is applied to the R142b reactor heavy component zero manual distillation method and mainly comprises at least one reactor 1, at least one reflux tower 2, a rectifying tower unit 3, an accident tower unit 4, an APC controller and a DCS control system.
The inside of each reactor 1 is provided with a catalyst and is connected with a raw material conveying pipeline, an electromagnetic valve is arranged on the raw material conveying pipeline, a temperature sensor is arranged in each reactor 1, and the reaction temperature is measured through the temperature sensor. The reflux towers 2 are arranged in one-to-one correspondence with the reactors 1, the reflux towers 2 carry out preliminary rectification on reaction discharge materials, and pressure gauges for measuring tower top pressure are arranged in the reflux towers 2. The rectifying tower unit 3 is connected with all the reflux towers 2 through pipelines, and the rectifying tower unit 3 carries out rectification and purification on the primarily rectified material to obtain an R142b product.
Heavy components are generated in the reaction process, and are absorbed by the accident tower unit 4. The accident tower unit 4 and the rectifying tower unit 3 are arranged in parallel, when the accident tower unit 4 and the rectifying tower unit 3 are independently started, and when the accident tower unit is in normal production, the rectifying tower unit 3 is started to produce R142b finished products, and a pipeline of the accident tower unit 4 is closed. When the kettle is steamed, the accident tower unit 4 is started, and the rectifying tower unit 3 is closed.
The APC controller can control the reaction temperature of each reactor 1 according to a sequential control program, and obtain the depressurization rate and the steamer duration according to historical big data analysis. And establishing a plurality of APC controllers of steam-reaction temperature through historical data analysis, mathematical model establishment and automatic controller establishment steps, and opening/closing corresponding APC controller switches in each step by a sequential control program so as to ensure stable temperature control under different conditions. The steam control reaction temperature realizes stable self-control by means of an APC controller/PID module and the like. The DCS control system controls the operation of the components such as the electromagnetic valves and the like according to a temperature control program of advanced control software (APC).
Further, the DCS control system is connected with an overpressure alarm, when the air pressure at the top of the reflux tower 2 exceeds a preset value in the DCS control system, the DCS control system controls the overpressure alarm to sound and alarm, the reaction speed of an overpressure accident is improved, and accordingly workers are reminded of overpressure abnormal conditions and timely remove the overpressure abnormal conditions.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The R142b reactor heavy component zero manual steaming method and the steaming device provided by the application are described in detail. The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (7)
1. An R142b reactor heavies zero manual removal method comprising the steps of:
starting a steaming kettle program, and starting up the self-checking by advanced control software (APC) to confirm that the accident tower unit (4) runs normally;
closing the feeding of each reactor (1);
the steam is controlled and stabilized to maintain the reaction temperature, the pressure of each reflux tower (2) is uniformly reduced to the pressure of the head tower of the rectifying tower unit (3) within a first preset time, and the control and stabilization of a freezing salt water valve of the reflux tower are regulated to maintain the backwater temperature;
steam control and stabilization are carried out to maintain the reaction temperature and maintain the temperature for a second preset time;
closing steam, switching a valve to discharge the steam to a reflux tower (2), and sending the steam to an accident tower unit (4), wherein the reflux tower (2) is pressed for a third preset time to uniformly reduce the pressure to 0Mpa;
starting steam, and keeping the steam to be stable at a preset temperature to wait for starting;
the R142b reactor includes:
at least one reactor (1), wherein a catalyst is arranged in each reactor (1) and is connected with a raw material conveying pipeline, an electromagnetic valve is arranged on the raw material conveying pipeline, and a temperature sensor for measuring the reaction temperature is arranged in each reactor (1);
at least one reflux tower (2) is arranged in one-to-one correspondence with each reactor (1) and is used for carrying out preliminary rectification on reaction discharge materials, and a pressure gauge used for measuring tower top pressure is arranged in each reflux tower (2);
the rectifying tower unit (3) is connected with all the reflux towers (2) through pipelines and is used for rectifying and purifying the primarily rectified materials;
an accident tower unit (4) for absorbing the recombinant component;
an APC controller for controlling the reaction temperature of each of the reactors (1) according to a sequence control program;
and the DCS control system is used for controlling the operation of each electromagnetic valve according to a temperature control program.
2. The R142b reactor heavies zero manual distillation method according to claim 1, wherein the normal operation determination conditions of the accident tower unit (4) are: the accident tower pump is running and the fan is running.
3. The R142b reactor back-to-back zero manual distillation method according to claim 2, further comprising the step of judging an overpressure event of said accident tower unit (4), comprising the steps of:
detecting whether the top of the accident tower unit (4) runs or not when steaming the kettle;
reading a pressure gauge reading at the top of the accident tower unit (4) under the state that a program-controlled switch of the steam kettle is opened;
judging whether the accident tower unit (4) is positive pressure currently or not;
and when the pressure gauge at the top of the accident tower unit (4) shows positive pressure, closing steam and a pipeline leading to the accident tower unit (4), and suspending a steam kettle sequence control program.
4. The R142b reactor heavies zero manual removal method of any one of claims 1-3, wherein the steps of: and before starting the steaming kettle program and the advanced control software (APC) starting self-checking to confirm that the accident tower unit (4) operates normally, the method further comprises the steps of:
analyzing and sorting historical operation data of the steam kettle by utilizing a database of advanced control software and a trend checking module, and sorting out the working steps of the steam kettle;
quantifying temperature and duration parameters of each step in the steaming kettle process;
an accident automatic processing module is configured to prevent overpressure and ensure the safety of the steaming kettle process;
and determining the sequential control running environment by utilizing a script module in advanced control software.
5. The R142b reactor heavies zero manual removal method of claim 3, wherein said steps: when the pressure gauge at the top of the accident tower unit (4) shows positive pressure, the method further comprises the steps of:
DCS system popup window and overpressure alarm.
6. The distillation apparatus for the R142b reactor according to any one of claims 1 to 5, wherein the distillation apparatus comprises:
at least one reactor (1), wherein a catalyst is arranged in each reactor (1) and is connected with a raw material conveying pipeline, an electromagnetic valve is arranged on the raw material conveying pipeline, and a temperature sensor for measuring the reaction temperature is arranged in each reactor (1);
at least one reflux tower (2) is arranged in one-to-one correspondence with each reactor (1) and is used for carrying out preliminary rectification on reaction discharge materials, and a pressure gauge used for measuring tower top pressure is arranged in each reflux tower (2);
the rectifying tower unit (3) is connected with all the reflux towers (2) through pipelines and is used for rectifying and purifying the primarily rectified materials;
an accident tower unit (4) for absorbing the recombinant component;
an APC controller for controlling the reaction temperature of each of the reactors (1) according to a sequence control program;
and the DCS control system is used for controlling the operation of each electromagnetic valve according to a temperature control program.
7. The steaming device according to claim 6, further comprising an overpressure alarm connected to the DCS control system for sounding an alarm when the pressure at the top of the reflux column (2) exceeds a preset value.
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