CN107151281A - Substance law PVC polymeric reaction temperature autocontrol methods - Google Patents
Substance law PVC polymeric reaction temperature autocontrol methods Download PDFInfo
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- CN107151281A CN107151281A CN201710306429.7A CN201710306429A CN107151281A CN 107151281 A CN107151281 A CN 107151281A CN 201710306429 A CN201710306429 A CN 201710306429A CN 107151281 A CN107151281 A CN 107151281A
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- 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
- C08F114/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F114/02—Monomers containing chlorine
- C08F114/04—Monomers containing two carbon atoms
- C08F114/06—Vinyl chloride
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- 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
- C08F2/00—Processes of polymerisation
- C08F2/02—Polymerisation in bulk
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
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Abstract
The present invention relates to substance law PVC polymerisation automation fields, and disclose a kind of substance law PVC polymeric reaction temperature autocontrol methods, conversion ratio is based especially on to realize the accurate control to polymeric kettle kettle temperature, in its DCS automatic control system, the computational methods and fiducial value of conversion ratio are preset, conversion ratio according to obtained by calculating is of different sizes relative to fiducial value, then think that reaction is in different times, correspondingly, tandem Staged cotrol or kettle is pressed to press Staged cotrol auto-polymerization kettle kettle temperature by kettle temperature kettle.The body method PVC polymeric reaction temperature autocontrol methods that the present invention is used, accurately control polymeric kettle temperature, improve the quality of product.
Description
Technical field
The present invention relates to a kind of substance law PVC polymeric kettle temprature control methods, particularly one kind being capable of more precise control
The method of reactor kettle temperature.
Background technology
Substance law PVC polymerization production devices are that VCM, vinyl chloride seed and auxiliary agent are added in polymeric kettle, polymerization
When kettle is warming up to polymeric reaction temperature, by adjusting polymeric kettle kettle temperature, to ensure the polyvinyl chloride product quality of generation, generally temperature
It is setting reaction temperature ± 0.2 DEG C to spend control accuracy requirement.The regulation of kettle temperature is mainly by adjusting supporting kettle top condenser, gathering
Close the circulating cooling water of kettle cooling jacket, polymeric kettle cooling and stirring device and degasser to realize, the recirculated cooling water
Corresponding regulating valve is measured generally to automatically adjust with DCS control systems.
The existing mode that existing kettle temperature is automatically adjusted mainly has two kinds：The first is suspension method PVC polymeric kettle circulating coolings
Water out water temperature and the bunch grade adjustment mode for polymerizeing kettle temperature composition, using polymerization temperature adjuster as master selector, it detects and controlled
The temperature of polymeric kettle processed, using cooling water outlet temperature adjuster as secondary controller, it is detected and the cooling water of control polymeric kettle goes out
Mouth temperature, using cooling water outlet temperature as subloop interference signal, major loop interference signal, polymeric kettle are used as using polymeric kettle kettle temperature
Master selector is inputted after the kettle temperature signal operation of temperature sensor collection, master selector output signal is passed with cooling water outlet temperature
Secondary controller, secondary controller output signal Staged cotrol jacket of polymerization cooling water are inputted after the temperature signal computing of sensor collection
Regulating valve, polymeric kettle inner cool tube cooling sea water regulating valve.Second is substance law PVC polymeric kettle circulating cooling waters and polymeric kettle gas
The seperating range control mode of phase pressure composition, adjuster is pressed as adjuster using kettle, and it detects and controls the pressure of polymeric kettle, by polymerizeing
Kettle pressure sensor collection kettle pressure signal, the kettle pressure signal of polymeric kettle pressure sensor collection with given kettle is voltage-controlled sets up definite value
Input regulator after computing, regulator output signal is controlled the cooling sea water regulating valve of kettle top condenser in Staged cotrol mode, gathered
Close kettle chuck cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling sea water regulating valve.Both regulations
In mode, according to the size or precision needs of control water, regulating valve can be single valve or setting small-large flow valve
Composition valve group in parallel carries out Staged cotrol.
But, in substance law PVC polymerization production devices, with the progress of polymerization process, polymerisation conversion reaches
When 20%, Free Monomer is converted into colloidal particle (colloidal particle aggregates into solid resin particle again), is formed after colloidal particle and gathered
The viscosity for closing the medium in kettle steeply rises, and heat transfer coefficient can also divide with occurring medium temperature in irregular change, polymeric kettle
The uneven increase of cloth, to polymeric kettle temperature detection, (detection of kettle temperature is general in each mounting temperature sensor of polymeric kettle upper, middle and lower, one
As take polymeric kettle middle portion temperature as polymerization kettle temperature) bring measurement to disturb, cause cooling liquid measure in chuck and temperature in the kettle it
Between change produce it is serious non-linear.When therefore using foregoing first way control kettle temperature, when reaction proceeds to necessarily
After degree, its control accuracy can be affected and reduce.According to polymeric kettle gaseous pressure as control parameter, deposited in terms of automatic control
In some shortcomings, especially show that acutely kettle pressure superpressure phenomenon and kettle pressure easily occurs to polymerisation early stage polymerisation in control
Fluctuation is larger, can cause the fluctuation of process control parameter, is affected to polymerizing vinyl chloride quality and safety.
The content of the invention
In order to overcome substance law PVC device polymerisations early stage poor using polymeric kettle gaseous pressure control kettle temperature control accuracy
Temperature survey interference problem caused by after being changed with polymerisation from from liquid phase to colloidal particle, the present invention is proposed：In substance law
PVC polyplant initial reaction stages, using " polymeric kettle temperature " (referred to as " kettle temperature ") and " polymeric kettle gaseous pressure " (abbreviation " kettle
Pressure ") tandem-Staged cotrol pattern；Setting value is reached in polyvinyl chloride conversion ratio, colloidal particle influence temperature sensor detects it
When, then polymeric kettle gaseous pressure Staged cotrol pattern is converted to, so as to improve polymeric kettle temperature control in polymerisation whole process
Precision processed, improves bulk polymerizod polyvinyl chloride product quality.
Above control method is based on the analysis below to bulk polymerizod polyvinyl chloride productive prospecting.
Stage phase chloroethylene polymerization system is in the homogeneous polymerization stage before the reaction, and polymerization heating reaches polymeric reaction temperature
When enter polymerization stage, when entering polymerisation, reaction is acutely and the more difficult control of pressure, the relative appearance of now temperature survey
Easily, polymeric kettle temperature and polymeric kettle gaseous pressure tandem-Staged cotrol pattern can now be taken；With the progress of polymerisation,
Liquid monomer is gradually decreased, and it is sol mixture to have in colloidal polymer appearance, polymeric kettle medium, also preferably takes polymerization during this
Kettle temperature degree and polymeric kettle gaseous pressure tandem-Staged cotrol pattern；After polymerisation to certain phase, sol is mixed in polymeric kettle
Colloidal particle ratio increase in compound, the conversion ratio that now can in real time be calculated according to polyplant control system judges, but works as
Conversion ratio exceedes after setting value, due to the presence of a large amount of colloid substances, and the temperature distributing disproportionation in polymeric kettle is even, can now take
Kettle presses the mode of seperating range control.
Above control method also quantifying based on conversion process.Conversion process can be quantified with conversion ratio index.This
In body method PVC polymerisations, common PVC (polyvinyl chloride) amounts and polymerisation for being defined as generating after polymerisation of conversion ratio
The percentage of the ratio of preceding VCM amount, based on this definition, in different control systems, its computational methods may be
Difference, enumerates a kind of computational methods of applicable substance law PVC polymerization conversions as follows.
First, the polymerisation of VCM belongs to heterogeneous free radical type chain polymerization mechanism, the activity of reaction
Center is free radical, and its reaction equation is as follows：
The thermal discharge of whole polymerisation：
QAlways=mMonomerIn △ H, formula,
mMonomerImplication is the quality of monomer in addition kettle, units/kg；
QAlwaysImplication all participates in reaction liberated heat, unit, KJ to add monomer in kettle；
Every kilogram of chloroethene alkene reaction generation polyvinyl chloride liberated heat of △ H implications, unit K J/kg；
The main vinyl chloride during chuck cooling water, kettle top condenser, stirring cooling water, the reaction of polymerisation heat output takes off
Gas is taken away, and is specifically calculated as follows：
(1) chuck cooling water heat exchange amount is calculated,
Q1=m1Cp△T1, in formula,
Q1Implication is chuck cooling water heat exchange amount, unit, kcal；
m1Implication is chuck cooling water flow, units/kg；
Cp implications are the specific heat capacity of cooling water, kcal/kg DEG C of unit；
△T1Implication is chuck cooling water outlet and inlet temperature difference, unit DEG C.
(2) condenser cooling water heat exchange amount in kettle top is calculated,
Q2=m2Cp△T2, in formula,
Q2Implication is kettle top condenser cooling water heat exchange amount, unit, kcal；
m2Implication is kettle top condenser cooling water flow, units/kg；
Cp implications are the specific heat capacity of cooling water, kcal/kg DEG C of unit；
△T2Implication is that kettle top condenser cooling water out temperature is poor, unit DEG C.
(3) stirring cooling water heat exchange amount is calculated：
Q3=m3Cp△T3, in formula,
Q3Implication is stirring cooling water heat exchange amount, unit, kcal；
m3Implication is stirring cooling water flow, units/kg；
Cp implications are the specific heat capacity of cooling water, kcal/kg DEG C of unit；
△T3Implication is stirring cooling water outlet and inlet temperature difference, unit DEG C.
(4) degassing cooling water heat exchange amount is calculated,
Q4=m4△H1, in formula,
Q4Implication is degassing cooling water heat exchange amount, unit, kcal；
m4Implication is vinyl chloride amount of gas evolved, units/kg；
△H1Implication is the latent heat of VCM at the reaction temperatures, unit kcal/kg；
(5) it is other
Because polymeric kettle outer wall is smaller to air heat output, ignore herein.
Calculated more than, then reaction heat transfer total amount QPass=Q1+Q2+Q3+Q4
Then QAlways=mMonomerIn △ H, formula,
mMonomerImplication is the quality of monomer in addition kettle, units/kg；
QAlwaysImplication all participates in reaction liberated heat, unit, KJ/mol to add monomer in kettle；
Every mole of chloroethene alkene reaction generation polyvinyl chloride liberated heat of △ H implications, unit K J/mol；It has been generally acknowledged that △ H
It is a constant, takes △ H=0.0017424KJ/kg after 108.9KJ/mol, reduced unit
Then, polymerization PVC conversion ratio η, which is calculated as follows, obtains：
η=KQPass/QAlways* 100%=K ((Q1+Q2+Q3+Q4)/QAlways) * 100%, in formula,
K is correction value, is rule of thumb set.
Based on above-mentioned analysis, technical scheme proposed by the present invention is：The substance law PVC polymeric reaction temperatures side of automatically controlling
Method, including DCS automatic control systems, the automatic control system act on the chilled water modulation of the kettle top condenser of polymeric kettle
Valve, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling sea water regulating valve, it is described
There are two kinds of changeable control models in DCS automatic control systems：One kind is that kettle temperature and kettle press tandem-Staged cotrol pattern,
Another is kettle pressure Staged cotrol pattern, using kettle temperature and kettle pressure tandem-Staged cotrol pattern during reaction starting, is reaching setting
Switching condition when, be switched to kettle pressure Staged cotrol pattern.
The scheme is improved relative to the core of prior art to be：In polymerisation early stage, kettle pressure control model is abandoned,
Use for reference suspension method PVC polymeric kettle recirculated cooling water exit water temperatures and polymerize the bunch grade adjustment mode of kettle temperature composition, carefully analyze this
Body method PVC polymerization processes and its kettle temperature influence factor, are creatively proposed with kettle temperature and kettle pressure tandem-Staged cotrol pattern control
Kettle temperature processed, so as to solve the problems, such as the kettle temperature control accuracy of polymerisation early stage ideally, further increases reaction peace
Full property and product quality, the inventive method is substantially the control by stages mode of two-part, and reacts whole two sections separation
Determination switching condition in other words setting, be based on the analysis to course of reaction.Because course of reaction can not be viewed directly
Arrive, it is recommended to use conversion ratio is as the indication of switching temperature automatic control mode, and reason is that conversion ratio is that control system can detect
Calculate and monitor in real time, conversion ratio can characterize the critical point of switching temperature automatic control mode, same set of for prolonged application
The system of production technology, feed intake reached duration can also being reduced to since a certain raw material after a large amount of samplings, either
Other indications of reaction process can reliably be weighed.
Automation mechanized operation for the control by stages described in realization and the optimization for being easy to control, the DCS, which is automatically controlled, is
The computational methods and the setting value of conversion ratio first of conversion ratio are preset in system, when the value of conversion ratio is less than the setting value of conversion ratio first
Between when, tandem-Staged cotrol Schema control kettle temperature is pressed using kettle temperature and kettle, when the value of conversion ratio reaches that conversion ratio first is set
After value, Staged cotrol Schema control kettle temperature is pressed using kettle.The concrete numerical value of the described setting value of conversion ratio first, can be with kettle temperature
The fluctuation size controlled obtains to judge benchmark according to assay optimization.
More specifically, the kettle temperature and kettle pressure tandem-Staged cotrol pattern refer to：Using TC adjusters as master selector, it
Detection and the temperature of control polymeric kettle, using PC adjusters as secondary controller, it detects and controls the pressure of polymeric kettle, by polymeric kettle
Pressure sensor collection kettle pressure interference signal, kettle temperature interference signal, polymeric kettle TEMP are gathered by polymeric kettle temperature sensor
Master selector, the kettle that master selector output signal is gathered with polymeric kettle pressure sensor are inputted after the kettle temperature signal operation of device collection
Secondary controller is inputted after pressure signal operation, it is the cooling sea water regulating valve of secondary controller output signal Staged cotrol kettle top condenser, poly-
Close kettle chuck cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling sea water regulating valve.
More specifically, the kettle pressure Staged cotrol pattern refers to：Using PC adjusters as adjuster, it is detected and control polymerization
The pressure of kettle, by polymeric kettle pressure sensor collection kettle pressure interference signal, polymeric kettle pressure sensor collection kettle pressure signal with
Given kettle is voltage-controlled to set up input regulator after definite value computing, and regulator output signal controls kettle top to condense in Staged cotrol mode
Cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve, the degasser cooling water of device
Regulating valve.
It is further continuously to be automatically controlled to realize, conversion ratio second has been preset in the DCS automatic control systems
Setting value, after the value of conversion ratio reaches the second setting value of conversion ratio, that is, thinks that polymerisation terminates, into down-stream.Afterwards
Onward sequence is typically, into discharging program and cleaning procedure, afterwards, to be prepared to enter into next round polymerisation program.
The beneficial effects of the invention are as follows：Avoid in polymerization process liquid phase to colloid convert when to temperature sensor
The adverse effect that kettle temperature signal acquisition and kettle pressure big ups and downs are automatically controlled to kettle temperature, is improved in polymerisation whole process
The control accuracy of polymeric kettle temperature, is conducive to improving bulk polymerizod polyvinyl chloride product quality.
Brief description of the drawings
Fig. 1 is the logic control schematic diagram of the whole polymerization reactor control of the present invention.
Fig. 2 presses the control principle drawing of tandem-Staged cotrol pattern for kettle temperature in the present invention and kettle.
Fig. 3 presses the control principle drawing of Staged cotrol pattern for kettle in the present invention.
Embodiment
Certain substance law PVC polymerizing reactors, including polymeric kettle, kettle top condenser, polymerization kettle agitator, degasser and
Chuck water cooling plant etc., wherein polymeric kettle have weighing sensor, temperature sensor, pressure sensor and chuck chilled water modulation
Valve, kettle top condenser has temperature sensor and cooling sea water regulating valve, and polymerization kettle agitator has temperature sensor and chilled water modulation
Valve, degasser have temperature sensor and cooling sea water regulating valve.
As shown in figure 1, it uses DCS automatic control systems to control kettle temperature, the automatic control system acts on polymeric kettle
The cooling sea water regulating valve of kettle top condenser, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve, deoxidation
There are two kinds of control models in device cooling sea water regulating valve, the DCS automatic control systems：One kind be kettle temperature and kettle pressure tandem-
Staged cotrol pattern, another is kettle pressure Staged cotrol pattern；Conversion ratio has also been preset in the DCS control systems
Computational methods and the setting value of conversion ratio first, the setting value of conversion ratio second, the wherein setting value of conversion ratio first are less than conversion ratio
Second setting value, after reaction starts, the conversion ratio according to obtained by real-time calculate, the side of automatically controlling of corresponding selection reaction temperature
Formula：When the value of conversion ratio is less than the first setting value of conversion ratio, tandem-Staged cotrol Schema control is pressed using kettle temperature and kettle, when
The value of conversion ratio is reached after the setting value of conversion ratio first, and Staged cotrol Schema control is pressed using kettle, is turned when the value of conversion ratio reaches
After the setting value of rate second, that is, think that polymerisation terminates, then polymerisation EP (end of program), into discharging program and flushing journey
Sequence, enters back into next round polymerisation program.
As shown in Fig. 2 the kettle temperature and kettle pressure-point journey serials control pattern refer to：Using TC adjusters as master selector, it
Detection and the temperature of control polymeric kettle, using PC adjusters as secondary controller, it detects and controls the pressure of polymeric kettle, by polymeric kettle
Pressure sensor collection kettle pressure interference signal, kettle temperature interference signal, polymeric kettle TEMP are gathered by polymeric kettle temperature sensor
Master selector, the kettle that master selector output signal is gathered with polymeric kettle pressure sensor are inputted after the kettle temperature signal operation of device collection
Secondary controller is inputted after pressure signal operation, it is the cooling sea water regulating valve of secondary controller output signal Staged cotrol kettle top condenser, poly-
Close kettle chuck cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling sea water regulating valve.TC adjusters, PC
Adjuster refers to existing automatic control system and selected.
As shown in figure 3, the kettle pressure Staged cotrol pattern refers to：Using PC adjusters as adjuster, it is detected and control is poly-
The pressure of kettle is closed, by polymeric kettle pressure sensor collection kettle pressure signal, the kettle of polymeric kettle pressure sensor collection presses signal with giving
Fixed kettle is voltage-controlled to set up input regulator after definite value computing, and regulator output signal controls kettle top condenser in Staged cotrol mode
Cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling water
Regulating valve.
According to Fig. 1, when conversion ratio is less than the first setting value of conversion ratio, polymeric kettle temperature and polymeric kettle gaseous pressure tandem
Control mode is as shown in Fig. 2 TC adjusters are referred to as master selector, and it is (main controlled that the variable that it detects and controlled is referred to as master variable
Parameter), i.e. the temperature of polymeric kettle；PC adjusters are referred to as secondary controller, and the variable that it detects and controlled is referred to as secondary variable (sub-quilt
Control parameter), i.e. the pressure of polymeric kettle is the auxiliary variable introduced to stablize master variable.Master selector (TC adjusters) is defeated
Go out as secondary controller (PC adjusters) setting value, system passes through secondary controller (PC adjusters) Staged cotrol kettle top condenser
Cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling water are adjusted
The action of valve is saved, the setting control to principal parameter kettle temperature is realized.
After conversion ratio reaches the setting value of conversion ratio first, now due to the increased shadow of the disturbing factor of temperature survey
Ring, the now control of kettle temperature is realized by the seperating range control of kettle pressure.As shown in Figure 2, i.e. given kettle is voltage-controlled sets up definite value, when
When pressure deviates the setting value, PC adjuster output control signals, according to the value of control signal, Staged cotrol kettle top is cold respectively
Cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, the polymeric kettle of condenser stir cooling sea water regulating valve and degasser is cold
But water regulating valve, requires that seperating range control signal can be adjusted, to meet the requirement of Stress control, finally according to the difference of technique
Reach the purpose of accurate control polymeric kettle kettle temperature.
Defaulting in the computational methods of the conversion ratio in the DCS automatic control systems can use what is be described in detail in Summary
Method.Proved using after the control method test of many times, the first setting value of conversion ratio preferred scope is 15%~20%.
In Fig. 2, Fig. 3, regulating valve 1, regulating valve 2 ... regulating valve n refer to the cooling water tune for kettle top condenser respectively
Section, jacket of polymerization chilled water modulation, polymeric kettle stirring chilled water modulation, each single valve of degasser chilled water modulation,
Do not depart from the scope of the inventive concept, can also further refine point journey composition, regulation order, the adjustable range of each regulating valve
Deng to reach the purpose of accurate control.
Claims (6)
1. substance law PVC polymeric reaction temperature autocontrol methods, including DCS automatic control systems, the automatic control system
Act on cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, polymeric kettle the stirring cooling of the kettle top condenser of polymeric kettle
Water regulating valve and degasser cooling sea water regulating valve, to control polymeric reaction temperature, it is characterized in that：The DCS, which is automatically controlled, is
There are two kinds of changeable control models in system：One kind is kettle temperature and kettle pressure tandem-Staged cotrol pattern, and another is kettle pressure point
Process control pattern, using kettle temperature and kettle pressure tandem-Staged cotrol pattern during reaction starting, when reaching the switching condition of setting,
It is switched to kettle pressure Staged cotrol pattern.
2. substance law PVC polymeric reaction temperature autocontrol methods according to claim 1, it is characterized in that：The DCS is certainly
The computational methods and the setting value of conversion ratio first of conversion ratio are preset in autocontrol system, when the value of conversion ratio is less than conversion ratio the
When between one setting value, tandem-Staged cotrol Schema control kettle temperature is pressed using kettle temperature and kettle, when the value of conversion ratio reaches conversion ratio
After first setting value, Staged cotrol Schema control kettle temperature is pressed using kettle.
3. substance law PVC polymeric reaction temperature autocontrol methods according to claim 2, it is characterized in that：The conversion
The setting value of rate first is 15%~20%.
4. substance law PVC polymeric reaction temperature autocontrol methods according to claim 1, it is characterized in that：The kettle temperature
Refer to kettle pressure tandem-Staged cotrol pattern：Using TC adjusters as master selector, it detects and controlled the temperature of polymeric kettle, with
PC adjusters are secondary controller, and it detects and controlled the pressure of polymeric kettle, and signal is pressed by polymeric kettle pressure sensor collection kettle, by
Polymeric kettle temperature sensor inputs main regulation after gathering kettle temperature signal, the kettle temperature signal operation of polymeric kettle temperature sensor collection
Secondary controller, pair regulation are inputted after device, the kettle pressure signal operation that master selector output signal is gathered with polymeric kettle pressure sensor
The cooling sea water regulating valve of device output signal Staged cotrol kettle top condenser, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring
Cooling sea water regulating valve and degasser cooling sea water regulating valve.
5. substance law PVC polymeric reaction temperature autocontrol methods according to claim 1, it is characterized in that：The kettle pressure
Staged cotrol pattern refers to：Using PC adjusters as adjuster, it detects and controls the pressure of polymeric kettle, by polymeric kettle pressure sensing
Device collection kettle pressure signal, kettle pressure signal and given kettle voltage-controlled set up of the collection of polymeric kettle pressure sensor input after definite value computing
Adjuster, regulator output signal controls the cooling sea water regulating valve of kettle top condenser, jacket of polymerization cold in Staged cotrol mode
But water regulating valve, polymeric kettle stir cooling sea water regulating valve, degasser cooling sea water regulating valve.
6. the substance law PVC polymeric reaction temperatures side of automatically controlling according to any one claim in claim 2~5
Method, it is characterized in that：The setting value of conversion ratio second is preset in the DCS automatic control systems, when the value of conversion ratio reaches conversion
After the setting value of rate second, that is, think that polymerisation terminates, into down-stream.
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| CN116143957A (en) * | 2022-08-26 | 2023-05-23 | 河北国超热力工程有限公司 | Intelligent control method for constant temperature reaction in heating process of polyvinyl chloride polymerization process |
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| CN116143957A (en) * | 2022-08-26 | 2023-05-23 | 河北国超热力工程有限公司 | Intelligent control method for constant temperature reaction in heating process of polyvinyl chloride polymerization process |
| CN116078308A (en) * | 2023-02-20 | 2023-05-09 | 河北国超热力工程有限公司 | Intelligent control method for reflux condenser at top of chloroethylene suspension polymerization kettle |
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