CN217543716U - Chloroethylene spherical tank safety early warning device in polyvinyl chloride production - Google Patents
Chloroethylene spherical tank safety early warning device in polyvinyl chloride production Download PDFInfo
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Abstract
The utility model relates to a chloroethylene spherical tank safety precaution device in polyvinyl chloride production, including chloroethylene conveying main pump, high-pressure water injection pipe, high-pressure water injection valve, water injection nitrogen pressure retaining valve, water injection governing valve, water injection bypass trip valve, buffer seals the inlet valve, buffer seals the jar, buffer seals the nitrogen valve, buffer seals the outlet valve, chloroethylene spherical tank level gauge A, chloroethylene spherical tank, chloroethylene recovery valve, chloroethylene spherical tank pressure gauge, chloroethylene spherical tank level gauge B, chloroethylene feed valve A, chloroethylene feed valve B, chloroethylene reflux valve, chloroethylene bleeder valve A, chloroethylene bleeder valve B, polymeric kettle chloroethylene feed valve, high pressure spray water valve, spray nitrogen pressure retaining valve, spray system pressure display, chloroethylene spherical tank spray system, chloroethylene gas detection instrument, spherical tank drainage valve; the components use the chloroethylene spherical tank as a center, operate stably, reduce labor intensity, realize full-automatic operation and improve working efficiency and safety and reliability.
Description
Technical Field
The utility model relates to a chloroethylene spherical tank equipment technical field in the polyvinyl chloride production, especially a chloroethylene spherical tank safety precaution device in the polyvinyl chloride production.
Background
In the suspension method polyvinyl chloride (PVC) production process, a vinyl chloride gas cabinet and a spherical tank, which are major hazard sources of vinyl chloride branch plants, are additionally provided with a cutting device at an inlet and an outlet, so that the safety production is ensured. The method comprises the steps of dehydrating, condensing and liquefying crude chloroethylene gas sent from a compression post, fractionating to refine chloroethylene according with indexes, dehydrating and dewatering the chloroethylene, sending the chloroethylene to a chloroethylene storage tank, refining the rectified chloroethylene, dehydrating the chloroethylene, sending the chloroethylene to a spherical tank through a chloroethylene dehydration section, returning a part of chloroethylene in the spherical tank to the spherical tank through a chloroethylene feeding pump, and sending a part of chloroethylene to a polymerization section after filtering the chloroethylene through a chloroethylene filter. The principle of vinyl chloride flooding when a leak occurs is as follows: the density of the chloroethylene is 910Kg/m 3 The density of water is 1000Kg/m 3 The density of water is greater than that of liquid vinyl chloride, vinyl chloride and water are immiscible and are generally recoveredAnd emergency water sealing is carried out on the bottom of the spherical tank in a bottom pipeline water injection mode. Generally, the above process is operated and controlled by a DCS control system.
In a known Control System, a Distributed Control System (DCS) is a Distributed Control System for short, and the DCS is a process Control System, is dynamic in real time and needs manual timely intervention, so that manual misoperation can be caused; the SIS is static and does not need human intervention, so that the setting can avoid human misoperation; the SIS control System is a Safety Interlocking System (Safety Instrument System) Safety Interlocking System/Safety Instrument System, which is abbreviated as Safety Interlocking System. SIS is a "static" system. The monitoring system is used for monitoring the running condition of the production device, rapidly processing abnormal working conditions, minimizing the possibility of failure occurrence and ensuring that people and devices are in safe states; under normal working conditions, the device always monitors the operation of the device, the system output is unchanged, and the production process is not influenced; under the abnormal working condition, the method carries out logic operation according to a pre-designed strategy so as to safely stop the production device; DCS is a "dynamic" system. The method is used for continuously detecting, calculating and controlling process variables (continuously, sequentially, intermittently and the like), dynamically controlling the production process, ensuring the stable operation of a production device and ensuring the product quality and products. The requirements of reliability and availability of the SIS are stricter than those of DCS, and the SIS and DCS hardware are required to be independently set in the standards of IEC61508, IEC61511 and the like. Such systems are often used in high-risk industries such as petrochemical industry, and once the system is operated, the whole plant is stopped to ensure a safety line.
The problems that exist at present are:
1. due to the low liquid level of the chloroethylene spherical tank, a chloroethylene pump is empty to pump, equipment facilities are damaged, and chloroethylene is leaked to cause fire explosion accidents;
2. when the spherical tank is abnormally leaked, the water injection operation at the bottom of the spherical tank is mostly judged and operated by operators according to experience;
3. when the liquid level of a vinyl chloride spherical tank in the original feeding procedure of a polymerization workshop is low, only a simple process alarm prompt is provided, but if a post operator does not control the vinyl chloride spherical tank in time or neglects the alarm in other busy situations, equipment and facilities are damaged, and safety accidents occur;
4. the accumulated liquid in the ball tank influences the vinyl chloride amount of the next procedure, and the hidden danger of coarse materials is generated;
5. the regular pollution discharge of the operators can increase the operation intensity of the operators;
6. the method for setting pressure and liquid level control by setting a DCS control system is not clear;
7. once the on-site spherical tank is abnormally evacuated, the consequences are serious, and liquid vinyl chloride can be leaked.
8. Chloroethylene is flammable, explosive and volatile, and potential safety hazards can be generated due to improper treatment, so that the gas detector is one of important safety control instruments.
Disclosure of Invention
An object of the utility model is to provide a do benefit to chloroethylene storage, safety protection and emergency control chloroethylene safety in production method, especially the safety precaution device of chloroethylene spherical tank in the polyvinyl chloride production in being fit for the chloroethylene production.
The utility model provides a technical scheme that its technical problem adopted is: a chloroethylene spherical tank safety early warning device in polyvinyl chloride production is provided with an SIS control system, a DCS control system independent hardware and software system, an SIS signal is set to be preferential, the SIS control system and the spherical tank liquid level, pressure and temperature meet certain high and low limit index linkage, and an SIS chloroethylene spherical tank liquid level meter A and a chloroethylene spherical tank liquid level meter B are set to be linked with a chloroethylene feeding valve B and a chloroethylene discharging valve B; a chloroethylene spherical tank pressure gauge is arranged to be interlocked with a chloroethylene recovery valve; a chloroethylene temperature display instrument is arranged to be linked with a chloroethylene feeding valve B, a high-pressure spraying water valve and a chloroethylene spherical tank spraying system; a DCS control system is arranged to control the whole process of feeding, discharging, refluxing, tank cutting, water injection and alarm process control of three vinyl chloride spherical tanks, a vinyl chloride spherical tank A is arranged as a standby recovery spherical tank, and a vinyl chloride spherical tank B/C is arranged as a polymerization feeding spherical tank; the method comprises a DCS automatic control mode and a manual control mode, wherein the manual control mode is that a central control operation station of a DCS control system is used for opening and closing a static and dynamic equipment valve, a pump and a detection instrument on a spherical tank according to the detection conditions of pressure, liquid level, temperature and a gas detector; in the DCS automatic control mode, a spherical tank is taken as a control center, and five sets of systems are arranged, namely a spherical tank feeding system, a spherical tank discharging system, a spherical tank early warning system, a spherical tank water injection system and a spherical tank spraying system; the vinyl chloride spherical tank starts five sets of systems according to the real-time production condition:
the ball tank feeding system is used for feeding the refined chloroethylene into a chloroethylene ball tank after the chloroethylene is rectified, and the chloroethylene ball tank is dehydrated by a chloroethylene dehydration section and then is fed into a chloroethylene ball tank, wherein one part of the chloroethylene is chloroethylene in a reflux system; when a vinyl chloride feed valve A and a vinyl chloride feed valve B in the spherical tank feeding system start a DCS automatic control mode and a linkage mode, when the linkage indexes of the spherical tank early warning system are reached, the vinyl chloride feed valve A is started to control emergency stop by the DCS, and the vinyl chloride feed valve B19 is controlled by the SIS to control emergency stop, a spherical tank liquid level range SL is set, a high-altitude alarm liquid level L1 is set, alarm information is prompted when the high-altitude alarm value L1 meets the limit liquid level or more, meanwhile, the SIS control system closes the vinyl chloride feed valve B, the high-altitude alarm liquid level L2 is prompted, and when the L2 meets the limit liquid level or more, the alarm information does not interlock the vinyl chloride feed valve B; setting a low liquid reporting level L3, prompting alarm information not to interlock a chloroethylene discharge valve B when the L3 is less than or equal to a limited liquid level, setting a low liquid reporting level L4, and prompting the alarm information to close a chloroethylene discharge valve B22 simultaneously when the L4 is less than or equal to the limited liquid level; in the operation, a DCS control system respectively closes a chloroethylene feeding valve A and a chloroethylene discharging valve A according to the same interlocking condition;
the above-mentioned meeting SIS control system trigger condition, the procedure acts automatically: when the liquid level of the chloroethylene spherical tank 13 is measured, and the chloroethylene spherical tank liquid level meter A and the chloroethylene spherical tank liquid level meter B are both more than or equal to 8.00m, 2 are taken out and used in a linkage mode, namely 1 liquid level meter is abnormal, and an alarm is prompted; when the 2 liquid level meters are abnormal, the liquid level meters are used in a linkage mode, a chloroethylene feeding valve B of a chloroethylene spherical tank is started to be closed, the lamp is operated in an auxiliary mode, and the buzzer sounds.
The emergency operation is manually operated: the auxiliary console emergency stop button is pressed down, the vinyl chloride feed valve B of the chain vinyl chloride spherical tank is closed, the auxiliary console lamp is turned on, and the buzzer sounds.
Resetting confirmation before the normal operation of the operation: if the two conditions are not met, pressing an SIS operation picture reset button in the operation station or the engineer station, and if the auxiliary console has the reset button, pressing confirmation; if the detection is not only confirmed by resetting in a computer, the chloroethylene feeding valve B of the chloroethylene spherical tank is opened, the desk lamp is turned off by auxiliary operation, and the buzzer does not sound.
Before the operation is normally operated, the operator needs to manually reset and confirm.
The spherical tank discharging system, namely when a DCS automatic control mode sets a chloroethylene spherical tank A as a standby recovery spherical tank, a chloroethylene spherical tank B/C is a polymerization feeding spherical tank, and the chloroethylene liquid level of each spherical tank is respectively set to be more than 1.5m 3 Feeding materials for polymerization in time, namely starting a spherical tank discharging system, arranging a conveying flow from a chloroethylene conveying pump to a polymerization kettle, arranging a chloroethylene discharging valve A to control emergency stop by DCS and arranging a chloroethylene discharging valve B to control emergency stop by SIS;
the ball tank discharging system is provided with a chloroethylene ball tank liquid level low alarm level L2=1.50m, a DCS control picture prompts low liquid level alarm after delaying for three seconds when L2 is less than or equal to 1.50m, the liquid level continues to delay for 2 seconds, the liquid level is low and does not rise, and the ball tank discharging system, a chloroethylene discharging valve A, a chloroethylene discharging valve B, a polymerization kettle and a chloroethylene feeding valve of the polymerization kettle are started and closed in an instant DCS automatic control mode to prompt failure stop of polymerization feeding.
The spherical tank early warning system sets up the pressure safety range value, liquid level safety range value, the temperature safety range value of chloroethylene spherical tank promptly:
the storage coefficient of the chloroethylene spherical tank arranged in the early warning system is not more than 85%; in thunderstorm or windstorm weather with pressure over seven levels, the total volume of the chloroethylene in the chloroethylene spherical tank is not more than 60 percent of the total volume; setting the monitoring index of a vinyl chloride gas detector within an allowable range, and setting the content of vinyl chloride in a sampling analysis to be less than 0.40%; if the information is not satisfied, starting emergency and alarm measures;
the early warning system detects a pressure safety range value in real time, sets a high-pressure report P1=0.35Mpa, a high-pressure report P2=0.35Mpa, a low-pressure report P2=0.15Mpa and a low-pressure report P2=0.10Mpa, and meets condition prompt alarm information;
the early warning system detects the liquid level safety range value in real time: setting a liquid level high-high report L1=8.00m, a high report L2=7.50m, a low report L3=2.00m and a low report L4=1.50m, and meeting condition prompting alarm information;
the early warning system detects the temperature safety range value in real time: setting the temperature high-high report T1=42 ℃, the high report T2=40 ℃, the low report T3= -10 ℃ and the low report T4= -13 ℃ to meet condition prompt alarm information;
the spherical tank water injection system comprises a high-pressure water injection pipe, a high-pressure water injection valve, a water injection nitrogen pressure retaining valve, a water injection regulating valve, a water injection bypass cut-off valve, a buffer liquid seal inlet valve, a buffer liquid seal tank, a buffer liquid seal nitrogen retaining valve, a buffer liquid seal outlet valve, a chloroethylene spherical tank liquid level meter A, a chloroethylene spherical tank pressure gauge and a chloroethylene spherical tank liquid level meter B; the buffer liquid sealed tank is a central control area, and an automatic water replenishing chain of the liquid seal of the spherical tank is arranged, so that the use state of the automatic water replenishing chain is generally ensured; ensuring that the liquid level of the buffer liquid seal tank is higher than 0.65m, and setting the closing states of a high-pressure water injection valve 4, a water injection nitrogen pressure retaining valve, a water injection regulating valve, a water injection bypass cut-off valve and a buffer liquid seal inlet valve; when detecting the abnormal leakage of the chloroethylene spherical tank 13, the central control personnel confirm the leakage of the sealing point at the bottom of the spherical tank 13 again and start the operation of switching the spare tanks of the chloroethylene spherical tank; and closing the corresponding leakage spherical tank feeding cut-off valve, starting the non-leakage vinyl chloride spherical tank feeding cut-off valve, and switching feeding to the non-leakage vinyl chloride spherical tank. DCS automatic start spherical tank water injection system switches spherical tank feed valve, closes chloroethylene bleeder valve A, chloroethylene bleeder valve B, and the chloroethylene reflux valve is opened spherical tank high pressure water injection valve, water injection nitrogen gas pressure retaining valve, water injection governing valve, buffer seal inlet valve, buffer seal nitrogen retaining valve, buffer seal outlet valve, and through pressure differential or nitrogen gas pressure supplementing, high pressure fire water is injected into the chloroethylene spherical tank. The water seal at the bottom of the chloroethylene spherical tank is realized, and the leakage of liquid chloroethylene is prevented; setting the rising speed of the liquid level of a leaked vinyl chloride spherical tank to be 0.05m/min, judging whether the liquid level rises regularly or not, wherein the speed meets the condition, the rising of the liquid level of the spherical tank indicates that the amount of water injected into the spherical tank is greater than the leakage amount of liquid vinyl chloride, controlling the liquid level to be less than a high altitude report L1=8.00m until all the water flowing out from the leakage point of the corresponding leaked spherical tank is water, closing a high-pressure water injection valve, a water injection nitrogen pressure retaining valve, a water injection regulating valve and a buffer liquid seal inlet valve 8 after the leakage treatment is normal, releasing a water injection linkage, simultaneously opening a condensation valve of the vinyl chloride spherical tank, discharging the water in the spherical tank until the liquid vinyl chloride is discharged, standing for 24 hours, and detecting that the water content of the liquid vinyl chloride in the corresponding leaked vinyl chloride spherical tank is less than 300PPm; if the condition is not met, repeating the operation of upper water injection and discharging.
The pressure of the corresponding leaked vinyl chloride spherical tank of the water injection system is greater than 0.38MPa, and a recovery cut-off valve for automatically opening the corresponding leaked vinyl chloride spherical tank is arranged;
the pressure of the high-pressure water injection pipe network is ensured to be at least above 0.50 MPa;
the liquid level of the buffer liquid sealing tank is higher than 0.65m, so as to ensure continuous effective liquid sealing;
the operation screen of the operation station is matched with an operation panel of 'water injection putting in use' and 'water injection releasing';
the alarm state of any valve or system is required to be manually released when the valve or system is abnormal and alarms.
The spherical tank spraying system comprises a high-pressure spraying water pipe, a high-pressure spraying water valve, a spraying nitrogen pressure retaining valve, a spraying system pressure display instrument, a vinyl chloride spherical tank spraying system and a vinyl chloride gas detector, wherein the vinyl chloride spherical tank spraying system is arranged at the top of a vinyl chloride ball tank, the vinyl chloride gas detector detects in real time, when the volume content of vinyl chloride is more than or equal to 0.50%, a DCS automatically starts the high-pressure spraying water pipe, the high-pressure spraying water valve, the spraying nitrogen pressure retaining valve and the vinyl chloride spherical tank spraying system in the spherical tank spraying system until the vinyl chloride volume content detected by the vinyl chloride gas detector is less than or equal to 0.35%, stops the spraying system, and closes the high-pressure spraying water pipe, the high-pressure spraying water valve, the spraying nitrogen pressure retaining valve and the vinyl chloride spherical tank spraying system; when the system detects that the temperature of the spherical tank is high and T2 is more than or equal to 40 ℃, starting a high-pressure spray water pipe, a high-pressure spray water valve, a spray nitrogen pressure retaining valve and a chloroethylene spherical tank spray system in the spherical tank spray system; and stopping the spraying system until the temperature of the spherical tank meets the temperature set value and is less than or equal to 30 ℃.
The safety early warning method for the vinyl chloride spherical tank in the polyvinyl chloride production comprises the steps that an SIS control system and a DCS control system are composed of hardware and software, wherein the hardware comprises a field control station, an operation station, an engineer station, a communication network cable and the like; the software comprises an operating system platform and SIS and DCS configuration software for industrial control.
The device comprises a main chloroethylene conveying pump, a spare pump of a chloroethylene conveying pump, a high-pressure water injection pipe, a high-pressure water injection valve, a water injection nitrogen pressure retaining valve, a water injection regulating valve, a water injection bypass cut-off valve, a buffer liquid seal inlet valve, a buffer liquid seal tank, a buffer liquid seal nitrogen retaining valve, a buffer liquid seal outlet valve, a chloroethylene ball tank liquid level meter A, a chloroethylene ball tank, a chloroethylene recovery valve, a chloroethylene ball tank pressure gauge, a chloroethylene ball tank liquid level meter B, a chloroethylene temperature display instrument, a chloroethylene feed valve A, a chloroethylene feed valve B, a chloroethylene reflux valve, a chloroethylene discharge valve A, a chloroethylene discharge valve B, a polymerization kettle, a chloroethylene feed valve of the polymerization kettle, a high-pressure spray water pipe, a high-pressure spray water valve, a nitrogen pressure retaining valve, a spray system pressure display instrument, a chloroethylene ball tank spray system, a chloroethylene gas detector and a ball tank condensation discharge valve; the components take the chloroethylene spherical tank as a center, and the lower part of the chloroethylene spherical tank is provided with a high-pressure water injection pipe, a high-pressure water injection valve, a water injection nitrogen pressure retaining valve, a water injection regulating valve, a water injection bypass cut-off valve, a buffer liquid seal inlet valve, a buffer liquid seal tank, a buffer liquid seal nitrogen retaining valve, a buffer liquid seal outlet valve, a chloroethylene feeding valve A, a chloroethylene feeding valve B, a chloroethylene reflux valve, a chloroethylene discharge valve A, a chloroethylene discharge valve B and a spherical tank drainage and condensation valve; the middle part of the chloroethylene spherical tank is provided with a chloroethylene spherical tank liquid level meter A, a chloroethylene spherical tank liquid level meter B and a chloroethylene temperature display instrument; the top of the chloroethylene spherical tank is provided with a chloroethylene recovery valve, a chloroethylene spherical tank pressure gauge, a high-pressure spray water pipe, a high-pressure spray water valve, a spray nitrogen pressure retaining valve, a spray system pressure display instrument, a chloroethylene spherical tank spray system and a chloroethylene gas detector; the chloroethylene discharge valve A and the chloroethylene discharge valve B are sequentially connected with a chloroethylene conveying main pump, a chloroethylene conveying pump standby pump, a polymerization kettle and a chloroethylene feed valve of the polymerization kettle.
The chloroethylene spherical tank liquid level meter A and the chloroethylene spherical tank pressure meter are arranged in a redundant mode to ensure safety and reliability.
The main chloroethylene conveying pump and the auxiliary chloroethylene conveying pump are arranged redundantly so as to ensure safety and reliability.
Buffer liquid seals jar sets up in the bottom of chloroethylene spherical tank, and its import department links to each other with high-pressure water injection pipe 3, high-pressure water injection valve, water injection nitrogen gas pressure retaining valve, water injection governing valve, water injection bypass trip valve, buffer liquid seal inlet valve 8 in proper order, and mainly used sets up the effect that spherical tank liquid seals automatic water supply chain, daily hourglass manual processing liquid seal moisturizing, safe and reliable more.
The bottom of the buffer liquid seal tank is provided with a buffer liquid seal inlet valve, and the lower part of the tank body side is provided with a buffer liquid seal nitrogen-retaining valve; the top of the device is provided with a buffer liquid sealed outlet valve connected with a vinyl chloride spherical tank.
The pressure of the high-pressure water injection pipe and the high-pressure spray water pipe is kept above 0.50Mpa so as to ensure the pressure during water injection or spraying.
The water injection nitrogen pressure retaining valve is arranged on the high-pressure water injection pipe and is required for ensuring the pressure of a water injection system.
The spraying nitrogen pressure retaining valve is arranged on the high-pressure spraying water pipe to ensure the pressure during spraying.
Preferably, all pressure and liquid level, gas detection appearance, automatic control valve state and open and close on vinyl chloride spherical tank, the buffer seal jar all link to each other with DCS control system, and the operation is more convenient, safe and reliable.
According to the safety early warning method for the vinyl chloride spherical tank in the production of the polyvinyl chloride, in the embodiment, a plurality of reference values of the preset temperature, the preset pressure, the preset liquid level and the preset vinyl chloride content can be obtained according to experience requirements, and the specific values have very important relations with the size, the equipment characteristics and the like of the vinyl chloride spherical tank.
The utility model mainly improves the control and hardware device of the vinyl chloride spherical tank 13, and the others are the same as the prior art.
Compared with the prior art, the utility model provides a chloroethylene spherical tank safety early warning device in polyvinyl chloride production, the spherical tank is a control center, five sets of systems are arranged, and the spherical tank feeding system and the spherical tank discharging system are respectively controlled by taking liquid level linkage as a core; the spherical tank early warning system takes pressure, temperature and liquid level as core linkage indexes; when the spherical tank is abnormally leaked, the spherical tank water injection system takes the water injection operation at the bottom of the spherical tank as the core control; the density of water is greater than that of liquid chloroethylene, and chloroethylene and water are insoluble with each other; the bottom sealing point of the chloroethylene spherical tank is leaked, the amount of water injected into the chloroethylene spherical tank through a water injection pipeline is more than or equal to the amount of water flowing out of the leakage point, so that the water flowing out of the leakage point is ensured instead of liquid chloroethylene, the emergency water seal at the bottom of the chloroethylene spherical tank is realized, the buffer liquid sealing tank is a spherical tank water injection central control area, a spherical tank liquid seal automatic water supplement linkage is arranged, and a leakage linkage is arranged at the same time, so that the leakage of the liquid chloroethylene is prevented; the spherical tank spraying system takes a gas detector detection index as a spraying starting core index, is safe and reliable, is beneficial to storing vinyl chloride, safety protection and emergency control of a safety production method of vinyl chloride, and is particularly suitable for a safety early warning method of a vinyl chloride spherical tank in the production of polyvinyl chloride in vinyl chloride production.
Drawings
Fig. 1 is a schematic view of the device of the present invention.
In fig. 1: 1 is a main chloroethylene conveying pump; 2 is a chloroethylene delivery pump and a backup pump; 3 is a high-pressure water injection pipe; 4 is a high-pressure water injection valve; 5, a water-injection nitrogen pressure retaining valve; 6 is a water injection regulating valve; 7 is a water injection bypass cut-off valve; 8 is a buffer liquid seal inlet valve; 9, sealing the tank by using a buffer solution; 10 is a buffer liquid sealing nitrogen-retaining valve; 11 is a buffer liquid sealed outlet valve; 12 is a chloroethylene spherical tank liquid level meter A;13 is a chloroethylene spherical tank; 14 is a vinyl chloride recovery valve; 15 is a chloroethylene spherical tank pressure gauge; a 16 chloroethylene ball tank liquid level meter B;17 is a chloroethylene temperature display instrument; 18 is a vinyl chloride feed valve A;19 is a vinyl chloride feed valve B;20 is a chloroethylene reflux valve; 21 is a chloroethylene discharge valve A;22 is a chloroethylene discharge valve B;23 is a polymerization kettle, 24 is a vinyl chloride feed valve of the polymerization kettle; 25 is a high-pressure spray header; 26 is a high-pressure spray water valve; 27 is a spraying nitrogen pressure retaining valve; 28 is a pressure display instrument of the spraying system; 29 is a vinyl chloride spherical tank spraying system; 30 is a chloroethylene gas detector; 31 is a spherical tank condensation discharging valve.
Detailed Description
As shown in fig. 1, a chloroethylene spherical tank safety early warning device in polyvinyl chloride production is provided with an SIS control system and a DCS control system independent hardware and software system, and is provided with SIS signal priority, an SIS control system is arranged to be interlocked with a spherical tank liquid level, pressure and temperature meeting certain high and low limit indexes, and an SIS chloroethylene spherical tank liquid level meter A12 and a chloroethylene spherical tank liquid level meter B16 are arranged to be interlocked with a chloroethylene feeding valve B19 and a chloroethylene discharging valve B22; a chloroethylene spherical tank pressure gauge 15 is arranged to be interlocked with a chloroethylene recovery valve 14; a chloroethylene temperature display instrument 17 is arranged to be interlocked with a chloroethylene feeding valve B19, a high-pressure spraying water valve 26 and a chloroethylene spherical tank spraying system 29; a DCS control system is arranged to control the whole process of feeding, discharging, refluxing, tank cutting, water injection and alarm process control of three vinyl chloride spherical tanks, a vinyl chloride spherical tank A is arranged as a standby recovery spherical tank, and a vinyl chloride spherical tank B/C is arranged as a polymerization feeding spherical tank; the method comprises a DCS automatic control mode and a manual control mode, wherein the manual control mode is that a central control operation station of a DCS control system is used for opening and closing a static and dynamic equipment valve, a pump and a detection instrument on a spherical tank according to the detection conditions of pressure, liquid level, temperature and a gas detector; in the DCS automatic control mode, a spherical tank is taken as a control center, and five sets of systems are arranged, namely a spherical tank feeding system, a spherical tank discharging system, a spherical tank early warning system, a spherical tank water injection system and a spherical tank spraying system; the chloroethylene spherical tank starts five sets of systems according to the real-time production condition:
the material feeding system of the spherical tank is that chloroethylene after being rectified is refined, and then is dehydrated by a chloroethylene dehydration section and then is sent into a chloroethylene spherical tank 13, and one part of chloroethylene is chloroethylene in a reflux system; when a vinyl chloride feeding valve A18 and a vinyl chloride feeding valve B19 in the spherical tank feeding system start a DCS automatic control mode and a linkage mode, the spherical tank early warning system is started to achieve each linkage index, namely, the vinyl chloride feeding valve A18 is started to control emergency stop by the DCS, the vinyl chloride feeding valve B19 is started to control emergency stop by the SIS, the spherical tank liquid level range SL =12.00m is set, a high-altitude alarm liquid level L1=8.00m is set, alarm information is prompted when the high-altitude alarm value L1 is not less than 8.00m, the SIS control system closes the vinyl chloride feeding valve B19, the high-altitude alarm liquid level L2=7.50m, and when the L2 is not less than 7.50m, the alarm information does not interlock the vinyl chloride feeding valve B19; setting a low alarm level L3=2.00m, when L3 is less than or equal to 2.00m, prompting alarm information does not interlock a chloroethylene discharge valve B22, setting a low alarm level L4=1.50m, and when L4 is less than or equal to 1.50m, prompting alarm information and closing the chloroethylene discharge valve B22; in the operation, a DCS control system respectively closes a chloroethylene feeding valve A18 and a chloroethylene discharging valve A21 according to the same interlocking condition;
the above-mentioned meeting SIS control system trigger condition, the procedure acts automatically: measuring the liquid level of a chloroethylene spherical tank 13, namely measuring the liquid level of a chloroethylene spherical tank liquid level meter A12 and the liquid level of a chloroethylene spherical tank liquid level meter B16 which are both more than or equal to 8.00m, taking 2 from the 2 and using the 2 in a linkage manner, namely 1 liquid level meter is abnormal, and prompting and alarming; if the 2 liquid level meters are abnormal, the liquid level meters are used in a chain manner, a vinyl chloride feeding valve B19 of a vinyl chloride ball tank 13 is started to be closed, a lamp is lighted by auxiliary operation, and a buzzer sounds.
The emergency operation is manually operated: the auxiliary console emergency stop button is pressed, the vinyl chloride feed valve B19 of the chain vinyl chloride spherical tank 13 is closed, the auxiliary console lamp is on, and the buzzer sounds.
Reset confirmation before the normal operation of the operation: if the two conditions are not met, pressing an SIS operation picture reset button in the operation station or the engineer station, and if the auxiliary console has the reset button, pressing confirmation; if the reset confirmation is not only confirmed in the computer, the vinyl chloride ball tank 13 is opened by a vinyl chloride feed valve B19, the desk lamp is turned off by auxiliary operation, and the buzzer does not sound.
Before the operation is normally operated, the operator needs to manually reset and confirm.
The spherical tank discharging system sets a chloroethylene spherical tank A as a standby recovery spherical tank in a DCS automatic control mode, and a chloroethylene spherical tank B/C is used for polymerization supplyA material ball tank, wherein the chloroethylene liquid level of each ball tank is more than 1.5m 3 Feeding materials for polymerization, namely starting a spherical tank discharging system, arranging a conveying flow from a chloroethylene conveying pump to a polymerization kettle 23, arranging a chloroethylene discharging valve A21 to be controlled by DCS to be suddenly stopped, and arranging a chloroethylene discharging valve B22 to be controlled by SIS to be suddenly stopped;
the ball tank discharging system is provided with a chloroethylene ball tank 13 with a low liquid level alarm position L2=1.50m, a DCS control picture prompts that the liquid level is low to alarm when the L2 is not more than 1.50m is delayed for three seconds, the time is continuously delayed for 2 seconds, the liquid level is low and does not rise, and the DCS automatic control mode is started to close the ball tank discharging system, a chloroethylene discharging valve A21, a chloroethylene discharging valve B22, a polymerization kettle 23 and a polymerization kettle chloroethylene feeding valve 24 immediately to prompt that the failure of polymerization feeding stops.
The spherical tank early warning system sets up the pressure safety range value, liquid level safety range value, the temperature safety range value of vinyl chloride spherical tank 13 promptly:
the storage coefficient of the chloroethylene spherical tank 13 set by the early warning system is not more than 85%; in thunderstorm or windy weather with pressure above seven levels, the total volume of the chloroethylene in the chloroethylene spherical tank 13 is not more than 60 percent of the total volume; setting the monitoring index of a vinyl chloride gas detector 30 within an allowable range, and setting the content of vinyl chloride in a sampling analysis to be less than 0.40%; if the information is not satisfied, starting emergency and alarm measures;
the early warning system detects a pressure safety range value in real time, sets a pressure high report P1=0.35Mpa, a pressure high report P2=0.35Mpa, a pressure low report P2=0.15Mpa and a pressure low report P2=0.10Mpa, and meets condition prompt alarm information;
the early warning system detects the liquid level safety range value in real time: setting a liquid level high-high report L1=8.00m, a high report L2=7.50m, a low report L3=2.00m and a low report L4=1.50m, and meeting condition prompting alarm information;
the early warning system detects the temperature safety range value in real time: setting the temperature high-high report T1=42 ℃, the high report T2=40 ℃, the low report T3= -10 ℃ and the low report T4= -13 ℃ to meet condition prompt alarm information;
the spherical tank water injection system comprises a high-pressure water injection pipe 3, a high-pressure water injection valve 4, a water injection nitrogen pressure retaining valve 5, a water injection regulating valve 6, a water injection bypass cut-off valve 7, a buffer liquid seal inlet valve 8, a buffer liquid seal tank 9, a buffer liquid seal nitrogen retaining valve 10, a buffer liquid seal outlet valve 11, a chloroethylene spherical tank liquid level meter A12, a chloroethylene spherical tank 13, a chloroethylene spherical tank pressure meter 15 and a chloroethylene spherical tank liquid level meter B16; the buffer liquid sealed tank 9 is a central control area, and a spherical tank liquid sealed automatic water replenishing chain is arranged, so that the use state of the automatic water replenishing chain is generally ensured; if the liquid level of the buffer liquid seal tank 9 is ensured to be higher than 0.65m, a high-pressure water injection valve 4, a water injection nitrogen pressure retaining valve 5, a water injection regulating valve 6, a water injection bypass cut-off valve 7 and a buffer liquid seal inlet valve 8 are set to be in a closed state; when detecting the abnormal leakage of the chloroethylene spherical tank 13, the central control personnel confirm the leakage of the sealing point at the bottom of the spherical tank 13 again and start the operation of switching the spare tanks of the chloroethylene spherical tank; and closing the corresponding leakage spherical tank feeding cut-off valve, starting the non-leakage vinyl chloride spherical tank feeding cut-off valve, and switching the feeding to the non-leakage vinyl chloride spherical tank. DCS automatic start spherical tank water injection system switches the spherical tank feed valve, closes chloroethylene bleeder valve A21, chloroethylene bleeder valve B22, and chloroethylene reflux valve 20 opens spherical tank high pressure water injection valve 4, water injection nitrogen pressure retaining valve 5, water injection governing valve 6, buffer seal inlet valve 8, buffer seal nitrogen retaining valve 10, buffer seal outlet valve, injects high pressure fire water into chloroethylene spherical tank 13 through pressure differential or nitrogen pressure compensation. The water seal at the bottom of the chloroethylene spherical tank 13 is realized, and the leakage of liquid chloroethylene is prevented; setting the rising speed of the liquid level of a leaked spherical tank to be 0.05m/1min, judging whether the liquid level rises regularly or not, wherein the speed meets the condition, the rising of the liquid level of the spherical tank indicates that the amount of water injected into the spherical tank is greater than the leakage amount of liquid chloroethylene, controlling the liquid level to be less than a high altitude report L1=8.00m until all water flows out of the leakage point of the corresponding leaked spherical tank, closing a high-pressure water injection valve 4 of the spherical tank, a water injection nitrogen pressure maintaining valve 5, a water injection regulating valve 6 and a buffer liquid seal inlet valve 8 after the water injection is finished and the leakage treatment is normal, releasing water injection linkage, opening a condensation discharging valve 31 of a chloroethylene spherical tank 13 at the same time, discharging the water in the spherical tank until the liquid chloroethylene is discharged, standing for 24 hours, and detecting that the liquid water-containing chloroethylene in the corresponding leaked chloroethylene spherical tank is less than 300PPm; if the condition is not met, repeating the operation of upper water injection and discharging.
The pressure of the corresponding leaked vinyl chloride spherical tank 13 of the water injection system is greater than 0.38MPa, and a recovery cut-off valve for automatically opening the corresponding leaked vinyl chloride spherical tank is arranged;
the pressure of the high-pressure water injection pipe 3 is ensured to be at least more than 0.50 MPa;
the liquid level of the buffer liquid seal tank 9 is higher than 0.65m, so as to ensure continuous effective liquid seal;
the operation screen of the operation station is matched with an operation panel of 'water injection putting in use' and 'water injection releasing';
any valve or system abnormality and alarm must be manually relieved.
The spherical tank spraying system comprises a high-pressure spraying water pipe 25, a high-pressure spraying water valve 26, a spraying nitrogen pressure retaining valve 27, a spraying system pressure display instrument 28, a vinyl chloride spherical tank spraying system 29 and a vinyl chloride gas detector 30, wherein the vinyl chloride spherical tank spraying system 29 is arranged at the top of a vinyl chloride ball tank 13, the vinyl chloride gas detector 30 detects in real time, when the volume content of vinyl chloride is more than or equal to 0.50%, a DCS automatically starts the high-pressure spraying water pipe 25, the high-pressure spraying water valve 26, the spraying nitrogen pressure retaining valve 27 and the vinyl chloride spherical tank spraying system 29 in the spherical tank spraying system until the volume content of vinyl chloride detected by the vinyl chloride gas detector is less than or equal to 0.35%, and the spraying system is stopped; when the system detects the temperature of the spherical tank 13 in real time and the temperature report T2 is more than or equal to 40 ℃, starting a high-pressure spray water pipe 25, a high-pressure spray water valve 26, a spray nitrogen pressure retaining valve 27 and a vinyl chloride spherical tank spray system 29 in the spherical tank spray system; and stopping the spraying system until the temperature of the spherical tank meets the temperature set value and is less than or equal to 30 ℃.
The safety early warning method for the vinyl chloride spherical tank in the polyvinyl chloride production comprises the steps that an SIS control system and a DCS control system are composed of hardware and software, wherein the hardware comprises a field control station, an operation station, an engineer station, a communication network line and the like; the software includes an operating system platform and SIS and DCS configuration software for industrial control.
The device comprises a main chloroethylene conveying pump 1, a spare chloroethylene conveying pump 2, a high-pressure water injection pipe 3, a high-pressure water injection valve 4, a water injection nitrogen pressure maintaining valve 5, a water injection regulating valve 6, a water injection bypass cut-off valve 7, a buffer liquid seal inlet valve 8, a buffer liquid seal tank 9, a buffer liquid seal nitrogen maintaining valve 10, a buffer liquid seal outlet valve 11, a chloroethylene ball tank liquid level meter A12, a chloroethylene ball tank 13, a chloroethylene recovery valve 14, a chloroethylene ball tank pressure meter 15, a chloroethylene ball tank liquid level meter B16, a chloroethylene temperature display instrument 17, a chloroethylene feed valve A18, a chloroethylene feed valve B19, a chloroethylene reflux valve 20, a chloroethylene discharge valve A21, a chloroethylene discharge valve B22, a polymerization kettle 23, a polymerization kettle chloroethylene feed valve 24, a high-pressure spray water pipe 25, a high-pressure spray water valve 26, a spray nitrogen pressure maintaining valve 27, a spray system pressure display instrument 28, a chloroethylene ball tank spray system 29, a chloroethylene gas detector 30 and a ball tank condensation discharge valve 31; the components take the chloroethylene spherical tank 13 as a center, and the lower part of the chloroethylene spherical tank 13 is provided with a high-pressure water injection pipe 3, a high-pressure water injection valve 4, a water injection nitrogen pressure retaining valve 5, a water injection regulating valve 6, a water injection bypass cut-off valve 7, a buffer liquid seal inlet valve 8, a buffer liquid seal tank 9, a buffer liquid seal nitrogen retaining valve 10, a buffer liquid seal outlet valve 11, a chloroethylene feeding valve A18, a chloroethylene feeding valve B19, a chloroethylene reflux valve 20, a chloroethylene discharging valve A21, a chloroethylene discharging valve B22 and a spherical tank condensation discharging valve 31; a chloroethylene ball tank liquid level meter A12, a chloroethylene ball tank liquid level meter B16 and a chloroethylene temperature display instrument 17 are arranged in the middle of the chloroethylene ball tank 13; a vinyl chloride recovery valve 14, a vinyl chloride spherical tank pressure gauge 15, a high-pressure spray water pipe 25, a high-pressure spray water valve 26, a spray nitrogen pressure retaining valve 27, a spray system pressure display instrument 28, a vinyl chloride spherical tank spray system 29 and a vinyl chloride gas detector 30 are arranged at the top of the vinyl chloride spherical tank 13; and the chloroethylene discharge valve A21 and the chloroethylene discharge valve B22 are sequentially connected with a chloroethylene conveying main pump 1, a chloroethylene conveying pump standby pump 2, a polymerization kettle 23 and a polymerization kettle chloroethylene feeding valve 24.
The chloroethylene spherical tank liquid level meter A12 and the chloroethylene spherical tank pressure meter 15 are arranged in a redundant mode to ensure safety and reliability.
The main vinyl chloride conveying pump 1 and the auxiliary vinyl chloride conveying pump 2 are arranged redundantly, so that safety and reliability are guaranteed.
Buffer solution seals jar 9 sets up in the bottom of chloroethylene spherical tank 13, and its import department links to each other with high-pressure water injection pipe 3, high-pressure water injection valve 4, water injection nitrogen gas pressure retaining valve 5, water injection governing valve 6, water injection bypass trip valve 7, buffer solution seal import valve 8 in proper order, and mainly used sets up the spherical tank liquid seal automatic water supply chain, daily hourglass manual processing liquid seal moisturizing effect, safe and reliable more.
The bottom of the buffer liquid sealing tank 9 is provided with a buffer liquid sealing inlet valve 8, and the lower part of the tank body side is provided with a buffer liquid sealing nitrogen-protecting valve 10 for ensuring the liquid sealing function of abnormal treatment; the top of the device is provided with a buffer liquid sealed outlet valve 11 which is connected with a vinyl chloride spherical tank 13.
The pressure of the high-pressure water injection pipe 3 and the high-pressure spray water pipe 25 is kept above 0.50Mpa so as to ensure the pressure during water injection or spraying.
And the water injection nitrogen pressure retaining valve 5 is arranged on the high-pressure water injection pipe 3 and is required for ensuring the pressure of a water injection system.
The spraying nitrogen pressure retaining valve 27 is arranged on the high-pressure spraying water pipe 25 to ensure the pressure during spraying.
Preferably, all pressure and liquid level, gas detection appearance, automatic control valve state and open and close on vinyl chloride spherical tank 13, the buffer solution seal tank 9 all link to each other with DCS control system, and the operation is more convenient, safe and reliable.
According to the safety early warning method for the vinyl chloride spherical tank in the polyvinyl chloride production, in the embodiment, the preset temperature, pressure, liquid level and vinyl chloride content reference values can be taken according to experience requirements, and specific values have very important relations with the size, equipment characteristics and the like of the vinyl chloride spherical tank.
The utility model discloses mainly make the improvement to the control of vinyl chloride spherical tank 13 and hardware device, played very effectual effect to its safety precaution, other are the same with prior art.
Claims (9)
1. A chloroethylene spherical tank safety early warning device in polyvinyl chloride production is characterized by comprising a chloroethylene conveying main pump, a chloroethylene conveying pump standby pump, a high-pressure water injection pipe, a high-pressure water injection valve, a water injection nitrogen pressure retaining valve, a water injection regulating valve, a water injection bypass cut-off valve, a buffer liquid seal inlet valve, a buffer liquid seal tank, a buffer liquid seal nitrogen retaining valve, a buffer liquid seal outlet valve, a chloroethylene spherical tank liquid level meter A, a chloroethylene spherical tank, a chloroethylene recovery valve, a chloroethylene spherical tank pressure gauge, a chloroethylene spherical tank liquid level meter B, a chloroethylene temperature display instrument, a chloroethylene feed valve A, a chloroethylene feed valve B, a chloroethylene reflux valve, a chloroethylene discharge valve A, a chloroethylene discharge valve B, a polymeric kettle, a chloroethylene feed valve of the polymeric kettle, a high-pressure spray water pipe, a high-pressure spray water valve, a nitrogen pressure retaining valve, a spray system pressure display instrument, a chloroethylene spherical tank spray system, a chloroethylene gas detector and a spherical tank condensate valve; the components take the chloroethylene spherical tank as a center, and the lower part of the chloroethylene spherical tank is provided with a high-pressure water injection pipe, a high-pressure water injection valve, a water injection nitrogen pressure retaining valve, a water injection regulating valve, a water injection bypass cut-off valve, a buffer liquid seal inlet valve, a buffer liquid seal tank, a buffer liquid seal nitrogen retaining valve, a buffer liquid seal outlet valve, a chloroethylene feeding valve A, a chloroethylene feeding valve B, a chloroethylene reflux valve, a chloroethylene discharge valve A, a chloroethylene discharge valve B and a spherical tank drainage and condensation valve; the middle part of the chloroethylene spherical tank is provided with a chloroethylene spherical tank liquid level meter A, a chloroethylene spherical tank liquid level meter B and a chloroethylene temperature display instrument; the top of the chloroethylene spherical tank is provided with a chloroethylene recovery valve, a chloroethylene spherical tank pressure gauge, a high-pressure spray water pipe, a high-pressure spray water valve, a spray nitrogen pressure retaining valve, a spray system pressure display instrument, a chloroethylene spherical tank spray system and a chloroethylene gas detector; and the chloroethylene discharge valve A and the chloroethylene discharge valve B are sequentially connected with a chloroethylene conveying main pump, a chloroethylene conveying pump standby pump, a polymerization kettle and a chloroethylene feeding valve of the polymerization kettle.
2. The safety precaution device of vinyl chloride spherical tank in polyvinyl chloride production as claimed in claim 1, wherein said level gauge A of vinyl chloride spherical tank and pressure gauge of vinyl chloride spherical tank are arranged redundantly.
3. The vinyl chloride spherical tank safety precaution device in polyvinyl chloride production of claim 1, characterized by that, the vinyl chloride delivery main pump, vinyl chloride delivery pump stand-by pump redundant setting.
4. A vinyl chloride spherical tank safety precaution device in polyvinyl chloride production as claimed in claim 1, wherein said buffer liquid seal tank is set at the bottom of vinyl chloride spherical tank, its inlet is connected with high pressure water injection pipe, high pressure water injection valve, water injection nitrogen pressure retaining valve, water injection regulating valve, water injection bypass cut-off valve, buffer liquid seal inlet valve in turn.
5. A vinyl chloride spherical tank safety precaution device in polyvinyl chloride production as claimed in claim 1, wherein said buffer liquid seal tank has a buffer liquid seal inlet valve at its bottom, and a buffer liquid seal nitrogen-retaining valve at its tank body side lower part; the top of the device is provided with a buffer liquid sealed outlet valve connected with a vinyl chloride spherical tank.
6. The safety precaution device of vinyl chloride spherical tank in polyvinyl chloride production as claimed in claim 1, wherein the pressure of said high pressure water injection pipe and high pressure spray water pipe is kept above 0.50 Mpa.
7. A vinyl chloride spherical tank safety precaution device in polyvinyl chloride production as claimed in claim 1, characterized in that, the water injection nitrogen pressure maintaining valve is arranged on the high pressure water injection pipe.
8. The safety precaution device of vinyl chloride spherical tank in polyvinyl chloride production as claimed in claim 1, wherein said spraying nitrogen pressure maintaining valve is arranged on the high pressure spraying water pipe.
9. The safety precaution device of vinyl chloride spherical tank in polyvinyl chloride production as claimed in claim 1, characterized in that all pressure and liquid level on the vinyl chloride spherical tank and buffer liquid seal tank, gas detector, automatic control valve state and opening and closing are connected with DCS control system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221070304.1U CN217543716U (en) | 2022-05-07 | 2022-05-07 | Chloroethylene spherical tank safety early warning device in polyvinyl chloride production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221070304.1U CN217543716U (en) | 2022-05-07 | 2022-05-07 | Chloroethylene spherical tank safety early warning device in polyvinyl chloride production |
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| CN217543716U true CN217543716U (en) | 2022-10-04 |
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| CN202221070304.1U Active CN217543716U (en) | 2022-05-07 | 2022-05-07 | Chloroethylene spherical tank safety early warning device in polyvinyl chloride production |
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| CN (1) | CN217543716U (en) |
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2022
- 2022-05-07 CN CN202221070304.1U patent/CN217543716U/en active Active
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