CN107151281B - Substance law PVC polymeric reaction temperature autocontrol method - Google Patents
Substance law PVC polymeric reaction temperature autocontrol method Download PDFInfo
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- CN107151281B CN107151281B CN201710306429.7A CN201710306429A CN107151281B CN 107151281 B CN107151281 B CN 107151281B CN 201710306429 A CN201710306429 A CN 201710306429A CN 107151281 B CN107151281 B CN 107151281B
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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
Abstract
The present invention relates to substance law PVC polymerization reaction automation fields, and disclose a kind of substance law PVC polymeric reaction temperature autocontrol method, conversion ratio is based especially on to realize the accurate control to polymeric kettle kettle temperature, in its DCS automatic control system, the calculation method and fiducial value of conversion ratio are preset, according to the resulting conversion ratio of calculating relative to the of different sizes of 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 method that the present invention uses, accurately controls polymeric kettle temperature, improves the quality of product.
Description
Technical field
The present invention relates to a kind of substance law PVC polymeric kettle temprature control methods, and especially one kind being capable of more precise control
The method of reaction kettle kettle temperature.
Background technique
Substance law PVC polymerization production device is that vinyl chloride monomer, 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 guarantee the polyvinyl chloride product quality generated, usually temperature
Spending control accuracy requirement is setting reaction temperature ± 0.2 DEG C.The adjusting of kettle temperature is mainly by adjusting matched kettle top condenser, gathering
It closes the circulating cooling water of kettle cooling jacket, polymeric kettle cooling and stirring device and degasser to realize, the recirculated cooling water
It measures corresponding regulating valve and is usually automatically adjusted with DCS control system.
There are mainly two types of the existing ways of existing kettle temperature automatic adjustment: the first is suspension method PVC polymeric kettle circulating cooling
Water out water temperature with polymerize kettle temperature composition bunch grade adjustment mode, using polymerization temperature adjuster as master selector, it detect and control
The temperature of polymeric kettle processed, using cooling water outlet temperature adjuster as secondary controller, the cooling water that it detects and controls polymeric kettle goes out
Mouth temperature, using cooling water outlet temperature as subloop interference signal, using polymeric kettle kettle temperature as major loop interference signal, polymeric kettle
Master selector is inputted after the kettle temperature signal operation of temperature sensor acquisition, master selector output signal and cooling water outlet temperature pass
Secondary controller, secondary controller output signal Staged cotrol jacket of polymerization cooling water are inputted after the temperature signal operation of sensor acquisition
Regulating valve, polymeric kettle inner cool tube cooling sea water regulating valve.Second is substance law PVC polymeric kettle circulating cooling water and polymeric kettle gas
The seperating range control mode of phase pressure composition, using kettle pressure adjuster as adjuster, it detects and controls the pressure of polymeric kettle, by polymerizeing
Kettle pressure sensor acquires kettle and presses signal, the kettle pressure signal of polymeric kettle pressure sensor acquisition and given kettle is voltage-controlled sets up definite value
Input regulator after operation, regulator output signal are controlled the cooling sea water regulating valve of kettle top condenser in a manner of Staged cotrol, gathered
Close kettle collet cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling sea water regulating valve.Both are adjusted
In mode, according to the size or precision needs of control water, regulating valve can be single valve, be also possible to that small-large flow valve is arranged
Composition valve group in parallel carries out Staged cotrol.
But in substance law PVC polymerization production device, 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 gathered after forming colloidal particle
The viscosity for closing the medium in kettle steeply rises, and heat transfer coefficient also can be with occurring irregular variation, and medium temperature is divided in polymeric kettle
Cloth unevenly increases, to polymeric kettle temperature detection (detection of kettle temperature generally 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 interfere, cause cooling liquid measure in collet and temperature in the kettle it
Between variation generate it is serious non-linear.When therefore using first way above-mentioned control kettle temperature, when reaction proceeds to centainly
After degree, control precision will receive influence and reduce.According to polymeric kettle gaseous pressure as control parameter, deposited in terms of automatic control
In some shortcomings, especially shows that polymerization reaction polymerization reaction early period acutely controls and be easy to appear kettle pressure superpressure phenomenon and kettle pressure
It fluctuates larger, will lead to the fluctuation of process control parameter, affect to polymerizing vinyl chloride quality and safety.
Summary of the invention
In order to overcome control kettle temperature control accuracy difference using polymeric kettle gaseous pressure substance law PVC device polymerization reaction early period
Temperature caused by after converting with polymerization reaction from from liquid phase to colloidal particle measures interference problem, and the present invention proposes: in substance law
PVC polyplant initial reaction stage, using " polymeric kettle temperature " (referred to as " kettle temperature ") and " polymeric kettle gaseous pressure " (referred to as " kettle
Pressure ") tandem-Staged cotrol mode；Reach setting value in polyvinyl chloride conversion ratio, colloidal particle influences temperature sensor and detects it
When, then polymeric kettle gaseous pressure Staged cotrol mode is converted to, to improve polymeric kettle temperature control in polymerization reaction whole process
Precision processed improves bulk polymerizod polyvinyl chloride product quality.
The above control method is based on the following analysis 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 polymerization reaction, reaction is acutely and pressure is more difficult to control, and temperature measurement at this time is opposite to be held
Easily, polymeric kettle temperature and polymeric kettle gaseous pressure tandem-Staged cotrol mode can be taken at this time；With the progress of polymerization reaction,
Liquid monomer gradually decreases, and has colloidal polymer appearance, and medium is liquid glue mixture in polymeric kettle, also preferably takes polymerization during this
Kettle temperature degree and polymeric kettle gaseous pressure tandem-Staged cotrol mode；After polymerization reaction to certain phase, liquid glue is mixed in polymeric kettle
It closes colloidal particle ratio in object to increase, can be judged at this time according to the conversion ratio that polyplant control system calculates in real time, but work as
After conversion ratio is more than setting value, due to the presence of a large amount of colloid substances, temperature distribution is non-uniform in polymeric kettle, can take at this time
The mode of kettle pressure seperating range control.
The above control method is also quantified based on conversion process.Conversion process can be quantified with conversion ratio index.This
In body method PVC polymerization reaction, common PVC (polyvinyl chloride) amount and polymerization reaction for being defined as generating after polymerization reaction of conversion ratio
The percentage of the ratio of preceding vinyl chloride monomer amount is based on this definition, and in different control systems, calculation method may be
Difference, the calculation method for enumerating a kind of applicable substance law PVC polymerization conversion are as follows.
Firstly, the polymerization reaction of vinyl chloride monomer belongs to heterogeneous free radical type chain polymerization mechanism, the activity of reaction
Center is free radical, and reaction equation is as follows:
The thermal discharge of entire polymerization reaction:
QAlways=mMonomer△ H, in formula,
mMonomerMeaning is that the quality of monomer in kettle, units/kg is added；
QAlwaysMeaning is that monomer in kettle is added all to participate in the heat that reaction is released, unit, KJ；
Every kilogram of chloroethene alkene reaction of △ H meaning generates the heat that polyvinyl chloride is released, unit K J/kg；
Polymerization reaction heat output is mainly taken off by vinyl chloride during collet cooling water, kettle top condenser, stirring cooling water, reaction
Gas is taken away, and specific calculating is as follows:
(1) collet cooling water heat exchange amount calculates,
Q1=m1Cp△T1, in formula,
Q1Meaning is collet cooling water heat exchange amount, unit, kcal；
m1Meaning is collet cooling water flow, units/kg；
Cp meaning be cooling water specific heat capacity, kcal/kg DEG C of unit；
△T1Meaning is collet cooling water outlet and inlet temperature difference, unit DEG C.
(2) kettle top condenser cooling water heat exchange amount calculates,
Q2=m2Cp△T2, in formula,
Q2Meaning is kettle top condenser cooling water heat exchange amount, unit, kcal；
m2Meaning is kettle top condenser cooling water flow, units/kg；
Cp meaning be cooling water specific heat capacity, kcal/kg DEG C of unit；
△T2Meaning is that kettle top condenser cooling water out temperature is poor, unit DEG C.
(3) stirring cooling water heat exchange amount calculates:
Q3=m3Cp△T3, in formula,
Q3Meaning is stirring cooling water heat exchange amount, unit, kcal；
m3Meaning is stirring cooling water flow, units/kg；
Cp meaning be cooling water specific heat capacity, kcal/kg DEG C of unit；
△T3Meaning is stirring cooling water outlet and inlet temperature difference, unit DEG C.
(4) degassing cooling water heat exchange amount calculates,
Q4=m4△H1, in formula,
Q4Meaning is degassing cooling water heat exchange amount, unit, kcal；
m4Meaning is vinyl chloride amount of gas evolved, units/kg；
△H1Meaning is the latent heat of vinyl chloride monomer at the reaction temperatures, unit kcal/kg；
(5) other
Because polymeric kettle outer wall is smaller to air heat output, ignore herein.
It is calculated according to above, then reacts heat transfer total amount QIt passes=Q1+Q2+Q3+Q4
Then QAlways=mMonomer△ H, in formula,
mMonomerMeaning is that the quality of monomer in kettle, units/kg is added；
QAlwaysMeaning is that monomer in kettle is added all to participate in the heat that reaction is released, unit, KJ/mol；
Every mole of chloroethene alkene reaction of △ H meaning generates the heat that polyvinyl chloride is released, unit K J/mol；Have been generally acknowledged that △ H
It is a constant, takes 108.9KJ/mol, △ H=0.0017424KJ/kg after reduced unit
Then, the conversion ratio η for polymerizeing PVC is calculated as follows to obtain:
η=KQIt passes/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 solution proposed by the present invention is: substance law PVC polymeric reaction temperature automatic control side
Method, including DCS automatic control system, 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
Have two kinds of changeable control models in DCS automatic control system: one is kettle temperatures and kettle to press tandem-Staged cotrol mode,
Another kind is kettle pressure Staged cotrol mode, presses tandem-Staged cotrol mode using kettle temperature and kettle when reaction originates, and is reaching setting
Switching condition when, be switched to kettle pressure Staged cotrol mode.
The core improvement of the scheme compared with the existing technology is: in polymerization reaction early period, kettle pressure control model is abandoned,
Suspension method PVC polymeric kettle recirculated cooling water exit water temperature and the bunch grade adjustment mode for polymerizeing kettle temperature composition are used for reference, this is carefully analyzed
Body method PVC polymerization process and its kettle temperature influence factor are creatively proposed with kettle temperature and kettle pressure tandem-Staged cotrol mode control
Kettle temperature processed further improves reaction peace to solve the kettle temperature control precision problem of polymerization reaction early period ideally
Full property and product quality, the method for the present invention is substantially the control by stages mode of two-part, and reacts whole two sections of separation
Determination switching condition in other words setting, be based on the analysis to reaction process.Since reaction process cannot be viewed directly
It arrives, it is recommended to use indication of the conversion ratio as switching temperature automatic control mode, the reason is that conversion ratio is that control system is detectable
It calculates and real-time monitoring, 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 duration achieved 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 measured.
To realize the automatic operation of the control by stages and convenient for the optimization of control, the DCS automatically controls system
The first setting value of calculation method and conversion ratio that conversion ratio has been preset in system, when the value of conversion ratio is lower than the first setting value of conversion ratio
Between when, tandem-Staged cotrol scheme control kettle temperature is pressed using kettle temperature and kettle, is set when the value of conversion ratio reaches conversion ratio first
After value, Staged cotrol scheme control kettle temperature is pressed using kettle.The specific value of first setting value of conversion ratio, can be with kettle temperature
The fluctuation size of control is to judge benchmark, is obtained according to assay optimization.
More specifically, the kettle temperature and kettle pressure tandem-Staged cotrol mode refer to: using TC adjuster as master selector, it
The temperature for detecting and controlling polymeric kettle, using PC adjuster as secondary controller, it detects and controls the pressure of polymeric kettle, by polymeric kettle
Pressure sensor acquires kettle and presses interference signal, acquires kettle temperature interference signal, polymeric kettle temperature sensing by polymeric kettle temperature sensor
Master selector, the kettle of master selector output signal and the acquisition of polymeric kettle pressure sensor are inputted after the kettle temperature signal operation of device acquisition
Secondary controller is inputted after pressure signal operation, the cooling sea water regulating valve of secondary controller output signal Staged cotrol kettle top condenser gathers
Close kettle collet 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 mode refers to: using PC adjuster as adjuster, it detects and controls polymerization
The pressure of kettle, by polymeric kettle pressure sensor acquisition kettle press interference signal, polymeric kettle pressure sensor acquisition kettle pressure signal with
The voltage-controlled input regulator after setting up definite value operation of given kettle, regulator output signal control kettle top condensation in a manner of Staged cotrol
Cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, the polymeric kettle of device stir cooling sea water regulating valve, degasser cooling water
Regulating valve.
Further, having preset conversion ratio second in the DCS automatic control system to realize continuous automatic control
Setting value thinks that polymerization reaction terminates, into down-stream after the value of conversion ratio reaches the second setting value of conversion ratio.Afterwards
Onward sequence is usually later, to be prepared to enter into next round polymerization reaction program into discharging program and cleaning procedure.
The beneficial effects of the present invention are: avoiding when liquid phase is converted to colloid in polymerization process to temperature sensor
The adverse effect that kettle temperature signal acquisition and kettle pressure big ups and downs automatically control kettle temperature, improves in polymerization reaction whole process
The control precision of polymeric kettle temperature is conducive to improve bulk polymerizod polyvinyl chloride product quality.
Detailed description of the invention
Fig. 1 is the logic control schematic diagram of the whole polymerization reactor control of the present invention.
Fig. 2 is that kettle temperature and kettle press tandem-Staged cotrol mode control principle drawing in the present invention.
Fig. 3 is the control principle drawing that kettle presses Staged cotrol mode in the present invention.
Specific embodiment
Certain substance law PVC polymerizing reactor, including polymeric kettle, kettle top condenser, polymerization kettle agitator, degasser and
Collet water cooling plant etc., wherein polymeric kettle has weighing sensor, temperature sensor, pressure sensor and collet chilled water modulation
Valve, kettle top condenser have 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 system 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 stir cooling sea water regulating valve, deoxidation
Device cooling sea water regulating valve, there are two types of control models for tool in the DCS automatic control system: one is kettle temperatures and kettle to press tandem-
Staged cotrol mode, another kind are kettle pressure Staged cotrol modes；Conversion ratio has also been preset in the DCS control system
The first setting value of calculation method and conversion ratio, the second setting value of conversion ratio, wherein the first setting value of conversion ratio is less than conversion ratio
Second setting value, after reaction starts, according to calculating resulting conversion ratio, the automatic control side of corresponding selection reaction temperature in real time
Formula: when the value of conversion ratio is lower than the first setting value of conversion ratio, pressing tandem-Staged cotrol scheme control using kettle temperature and kettle, when
After the value of conversion ratio reaches the first setting value of conversion ratio, Staged cotrol scheme control is pressed using kettle, is turned when the value of conversion ratio reaches
After the second setting value of rate, that is, think that polymerization reaction terminates, then polymerization reaction EP (end of program) into discharging program and rinses journey
Sequence enters back into next round polymerization reaction program.
As shown in Fig. 2, the kettle temperature and kettle pressure-point journey serials control mode refer to: using TC adjuster as master selector, it
The temperature for detecting and controlling polymeric kettle, using PC adjuster as secondary controller, it detects and controls the pressure of polymeric kettle, by polymeric kettle
Pressure sensor acquires kettle and presses interference signal, acquires kettle temperature interference signal, polymeric kettle temperature sensing by polymeric kettle temperature sensor
Master selector, the kettle of master selector output signal and the acquisition of polymeric kettle pressure sensor are inputted after the kettle temperature signal operation of device acquisition
Secondary controller is inputted after pressure signal operation, the cooling sea water regulating valve of secondary controller output signal Staged cotrol kettle top condenser gathers
Close kettle collet cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve and degasser cooling sea water regulating valve.TC adjuster, PC
Adjuster can refer to existing automatic control system and select.
As shown in figure 3, the kettle pressure Staged cotrol mode refers to: using PC adjuster as adjuster, it detects and controls poly-
The pressure for closing kettle presses signal by polymeric kettle pressure sensor acquisition kettle, and the kettle of polymeric kettle pressure sensor acquisition is pressed signal and given
The voltage-controlled input regulator after setting up definite value operation of fixed kettle, regulator output signal control kettle top condenser in a manner of Staged cotrol
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
For control mode as shown in Fig. 2, TC adjuster is known as master selector, it is (main controlled that the variable that it is detected and controlled is known as master variable
Parameter), i.e. the temperature of polymeric kettle；PC adjuster is known as secondary controller, and the variable that it is detected and controlled is known as secondary variable (sub-quilt
Control parameter), i.e. the pressure of polymeric kettle is the auxiliary variable that introduces in order to stablize master variable.Master selector (TC adjuster) is defeated
It is used as secondary controller (PC adjuster) setting value out, system passes through secondary controller (PC adjuster) 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 tune
The movement of valve is saved, realizes the setting control to principal parameter kettle temperature.
After conversion ratio reaches the first setting value of conversion ratio, at this time due to the increased shadow of disturbing factor of temperature measurement
It rings, the control of kettle temperature is realized by the seperating range control of kettle pressure at this time.As shown in Figure 2, that is, it is given that kettle is voltage-controlled sets up definite value, when
When pressure deviates the setting value, PC adjuster output control signal, 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 is required according to the difference of technique, and seperating range control signal can adjust, to meet the requirement of pressure control, finally
Achieve the purpose that accurately to control polymeric kettle kettle temperature.
The calculation method of the conversion ratio defaulted in the DCS automatic control system can be used to be described in detail in Summary
Method.Using proving after the control method test of many times, which is 15%~20%.
In Fig. 2, Fig. 3, regulating valve 1, regulating valve 2 ... regulating valve n respectively refer to the cooling water tune for kettle top condenser
Each single valve of section, jacket of polymerization chilled water modulation, polymeric kettle stirring chilled water modulation, degasser chilled water modulation,
It does not depart from the scope of the inventive concept, can also further refine point journey composition, the adjusting sequence, adjustable range of each regulating valve
Deng to reach the purpose of accurate control.
Claims (3)
1. substance law PVC polymeric reaction temperature autocontrol method, including DCS automatic control system, 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 automatically controls system
Changeable control model there are two types of having in system: one is kettle temperatures and kettle to press tandem-Staged cotrol mode, and another kind is kettle pressure point
Process control mode presses tandem-Staged cotrol mode using kettle temperature and kettle when reaction originates, in the switching condition for reaching setting,
It is switched to kettle pressure Staged cotrol mode, the kettle pressure Staged cotrol mode refers to: using PC adjuster as adjuster, it is detected and control
The pressure of polymeric kettle processed presses signal by polymeric kettle pressure sensor acquisition kettle, and the kettle of polymeric kettle pressure sensor acquisition presses signal
With the voltage-controlled input regulator after setting up definite value operation of given kettle, it is cold that regulator output signal controls kettle top in a manner of Staged cotrol
Cooling sea water regulating valve, jacket of polymerization cooling sea water regulating valve, polymeric kettle stirring cooling sea water regulating valve, the degasser of condenser are cooling
Water regulating valve；The first setting value of calculation method and conversion ratio of conversion ratio, conversion ratio have been preset in the DCS automatic control system
It is defined as the percentage of the polyvinyl chloride amount generated after polymerization reaction with the ratio of vinyl chloride monomer amount before polymerization reaction, works as conversion
When the value of rate is lower than the first setting value of conversion ratio, tandem-Staged cotrol scheme control kettle temperature is pressed using kettle temperature and kettle, works as conversion ratio
Value reach the first setting value of conversion ratio after, using kettle press Staged cotrol scheme control kettle temperature；First setting value of conversion ratio
Value range be 15%~20%.
2. substance law PVC polymeric reaction temperature autocontrol method according to claim 1, it is characterized in that: the kettle temperature
Refer to kettle pressure tandem-Staged cotrol mode: using TC adjuster as master selector, it detects and controls the temperature of polymeric kettle, with
PC adjuster is secondary controller, it detects and controls the pressure of polymeric kettle, presses signal by polymeric kettle pressure sensor acquisition kettle, by
Polymeric kettle temperature sensor acquires kettle temperature signal, inputs main regulation after the kettle temperature signal operation of polymeric kettle temperature sensor acquisition
Secondary controller is inputted after the kettle pressure signal operation of device, master selector output signal and the acquisition of polymeric kettle pressure sensor, pair is adjusted
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.
3. substance law PVC polymeric reaction temperature autocontrol method according to claim 1 or 2, it is characterized in that: described
The second setting value of conversion ratio is preset in DCS automatic control system, after the value of conversion ratio reaches the second setting value of conversion ratio, i.e.,
Think that polymerization reaction terminates, into down-stream.
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| CN116143956A (en) * | 2022-08-26 | 2023-05-23 | 河北国超热力工程有限公司 | On-line monitoring and intelligent regulating method for chloroethylene polymerization reaction rate |
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