CN210449158U - Polymerization kettle emergency treatment system - Google Patents
Polymerization kettle emergency treatment system Download PDFInfo
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- CN210449158U CN210449158U CN201921096054.7U CN201921096054U CN210449158U CN 210449158 U CN210449158 U CN 210449158U CN 201921096054 U CN201921096054 U CN 201921096054U CN 210449158 U CN210449158 U CN 210449158U
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Abstract
The utility model provides a polymeric kettle emergency treatment system, it includes: the system comprises a polymerization kettle (1), a cold water tank (4) and a hot water tank (3), wherein a cold water tank delivery pump (8) is used for driving water in the cold water tank (4) to flow, a hot water tank delivery pump (7) is used for driving water in the hot water tank (3) to flow, and the water in the cold water tank (4) and the hot water tank (3) is mixed and then is used for heating and cooling the polymerization kettle (1); the system also comprises a standby generator (15), wherein the standby generator (15) can generate standby electric energy, and the standby electric energy is electrically connected to the cold water tank conveying pump (8) and/or the hot water tank conveying pump (7) to drive the cold water tank conveying pump (8) and/or the hot water tank conveying pump (7) to operate. Through the utility model discloses can effectively avoid polymeric kettle (reation kettle) system to break down and lead to the condition such as quality accident to take place, improve polymeric kettle reaction unit's emergency treatment ability, improve operational reliability and security.
Description
Technical Field
The utility model belongs to the technical field of polymerization, concretely relates to polymeric kettle emergency treatment system.
Background
The basic process for acrylonitrile solution polymerization comprises the following steps: acrylonitrile, a solvent and a small amount of auxiliary agent are put into a reaction swab to reach a certain temperature condition, and the monomer opens double bond connection to form a linear polyacrylonitrile chain under the action of an initiator and releases reaction heat. The polymerization reaction kettle is divided into a vertical type and a horizontal type, the polymerization reaction kettle which is generally used at present is a vertical type and is provided with an internal and external heat exchange structure (a coil pipe, a guide cylinder, a jacket and the like), and heat exchange water comes from a constant temperature water system, namely cold and hot water tank mixed water supply. Install the magnetic drive coupler on the cauldron lid, the transmission shaft of magnetic drive coupler stretches into the cauldron internal with (mixing) shaft fixed connection, the upper portion fixed mounting of (mixing) shaft has the turbine stirring rake, can make intensification, constant temperature accurate controllable, the stirring is abundant even, the system mass transfer, heat transfer are even, make high viscosity polymerization liquid be in fine mobile state in the cauldron, make the cauldron in polymerization temperature even and not arouse the auto-agglutination, stabilize its degree of polymerization.
In the production and preparation of polyacrylonitrile-based carbon fibers, as an initial step of the whole manufacturing process, the polymerization section is the key to determine the properties of the carbon fiber product, and the process stability of the polymerizer plays a decisive role therein. In the acrylonitrile polymerization reaction process, the operation of a polymerization kettle must be safe and reliable, and once a fault occurs, particularly a power failure occurs, the operation of a reaction kettle system is stopped, equipment motors and the like cannot work normally, so that quality accidents, even production stoppage, equipment damage and other safety accidents are caused.
Because the polymeric kettle in the production preparation of the polyacrylonitrile-based carbon fiber among the prior art has the trouble especially to have a power failure and leads to reation kettle system shutdown, and the equal unable normal work of equipment motor etc. will cause the quality accident, technical problem such as incident such as even stop production, equipment damage, consequently the utility model discloses research and design a polymeric kettle emergency treatment system.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the reation kettle among the prior art and having the trouble especially have a power failure and lead to reation kettle system shutdown, will cause the defect of quality accident etc to a reation kettle emergency treatment system is provided.
The utility model provides a polymeric kettle emergency treatment system, it includes:
the polymerization kettle is cooled after water in the cold water tank and water in the hot water tank are mixed;
the system also comprises a standby generator which can generate standby electric energy and the standby electric energy is electrically connected to the cold water tank conveying pump and/or the hot water tank conveying pump so as to drive the cold water tank conveying pump and/or the hot water tank conveying pump to operate.
Preferably, the first and second electrodes are formed of a metal,
the standby generator is a diesel generator; and/or the cold water tank can be cooled by external cooling water and the hot water tank can be heated by external steam.
Preferably, the first and second electrodes are formed of a metal,
the standby electric energy is also electrically connected with a stirring shaft of the polymerization kettle so as to drive the stirring shaft to carry out polymerization stirring in the polymerization kettle.
Preferably, the first and second electrodes are formed of a metal,
the system also comprises a polymerization kettle heat exchange assembly capable of exchanging heat for the polymerization kettle, wherein the polymerization kettle heat exchange assembly can be communicated with the mixed water in the cold water tank and the hot water tank so as to cool the polymerization kettle.
Preferably, the first and second electrodes are formed of a metal,
the polymerization kettle heat exchange assembly further comprises at least one of a polymerization kettle jacket, a coil pipe and a guide cylinder, and the polymerization kettle jacket is sleeved on the periphery of the polymerization kettle.
Preferably, the first and second electrodes are formed of a metal,
still including being used for providing the fire water's fire water pipeline, the fire water pipeline also can with the polymeric kettle heat exchange assemblies intercommunication to the polymeric kettle cools down.
Preferably, the first and second electrodes are formed of a metal,
a fire water return valve is also disposed between the fire water line and the polymeric kettle heat exchange assembly along the flow direction of the fire water from the fire water line toward the polymeric kettle heat exchange assembly, and a fire water return valve is also disposed between the polymeric kettle heat exchange assembly and the fire water line along the flow direction of the fire water from the polymeric kettle heat exchange assembly toward the fire water line.
Preferably, the first and second electrodes are formed of a metal,
the system also comprises a cold and hot water tank water feeding valve and a cold and hot water tank water return valve, wherein water in the cold water tank and water in the hot water tank are mixed and then communicated with the polymerization kettle heat exchange assembly through the cold and hot water tank water feeding valve; and/or the water after heat exchange in the heat exchange component of the polymerization kettle passes through the cold water tank and the hot water tank and then is respectively communicated with the cold water tank and the hot water tank.
Preferably, the first and second electrodes are formed of a metal,
the pressure relief valve is arranged on the polymerization kettle, so that when the pressure in the polymerization kettle reaches a preset pressure value, the pressure relief valve can be automatically opened to relieve the pressure.
Preferably, the first and second electrodes are formed of a metal,
still include emergent groove, one of them export of polymeric kettle can with emergent groove intercommunication, above-mentioned export of polymeric kettle with be provided with emergent discharge valve on the pipeline between the emergent groove to when the temperature reaches first preset temperature value in the polymeric kettle, emergent discharge valve can open automatically with will material in the polymeric kettle discharges.
The utility model provides a pair of polymeric kettle emergency processing system has following beneficial effect:
1. the utility model discloses a with the reserve generator of reserve setting with hot water tank delivery pump and/or cold water tank delivery pump electricity be connected, can also continue to drive cold water tank delivery pump and/or the hot water tank delivery pump is in order to send the water in the cold water tank and/or the water in the hot water tank to cooling off the polymeric kettle when the polymeric kettle reaction has a power failure, can effectively avoid polymeric kettle (reation kettle) system to break down and stop operation, because the internal reaction temperature is too high and lead to the emergence of the condition such as quality accident, avoid equipment shut down, equipment damage to take place, improve the emergency treatment ability of polymeric kettle reaction unit, improve its work or operation reliability and security;
2. the utility model also can cool and radiate the polymerization kettle when the polymerization kettle reaction has faults, such as power failure and the like, by arranging the communication arrangement of the fire-fighting water pipeline, thereby further avoiding the occurrence of quality accidents and the like caused by overhigh reaction temperature in the polymerization kettle, further improving the emergency treatment capability of the polymerization kettle reaction device, and improving the working or operating reliability and safety of the polymerization kettle reaction device;
3. the utility model also can effectively monitor and control the pressure inside the polymerization kettle through the pressure safety valve arranged on the polymerization kettle, so that the safety valve is opened to release the pressure inside the polymerization kettle when the pressure inside the polymerization kettle exceeds the standard, thereby ensuring the normal pressure inside the polymerization kettle, further improving the emergency treatment capacity of the polymerization kettle reaction device and improving the working or running reliability; still through the emergent discharge valve that sets up on the polymeric kettle, can carry out effective monitoring and control to the inside temperature of polymeric kettle for open this emergent discharge valve in order in time to discharge the inside material of polymeric kettle when the inside temperature of polymeric kettle exceeds standard, guarantee the inside normal temperature of polymeric kettle, further improve polymeric kettle reaction unit's emergent throughput, improve work or operational reliability.
Drawings
FIG. 1 is a schematic structural view of the emergency treatment system of a polymerizer of the present invention.
The reference numbers in the figures denote:
1. a polymerization kettle; 2. a stirring shaft; 3. a hot water tank; 4. a cold water tank; 5. steam; 6. cooling water; 7. a hot water tank delivery pump; 8. a cold water tank transfer pump; 9. a water supply valve of the cold and hot water tank; 10. a cold and hot water tank return valve; 11. a fire-fighting water overflow valve; 12. a fire water return valve; 13. an emergency slot; 14. an emergency drain valve; 15. a standby generator; 16. a pressure relief valve; 17. fire-fighting water pipeline.
Detailed Description
As shown in fig. 1, the utility model provides a polymeric kettle emergency treatment system, it includes:
the polymerization kettle comprises a polymerization kettle 1, a cold water tank 4 and a hot water tank 3, wherein a cold water tank delivery pump 8 is used for driving water in the cold water tank 4 to flow, a hot water tank delivery pump 7 is used for driving water in the hot water tank 3 to flow, and the water in the cold water tank 4 and the water in the hot water tank 3 are mixed and then cool the polymerization kettle 1;
a backup generator 15 is also included, the backup generator 15 being capable of generating backup power, and the backup power being electrically connected to the cold water tank transfer pump 8 and/or the hot water tank transfer pump 7 (preferably, the backup power is electrically connected to a portion of the electrical system which is then electrically connected to the cold water tank transfer pump and/or the hot water tank transfer pump) to drive the cold water tank transfer pump 8 and/or the hot water tank transfer pump 7 to operate (as shown in dashed lines in fig. 1, which are electrical connections).
The utility model discloses a with the reserve generator of reserve setting and hot water tank delivery pump and/or cold water tank delivery pump electricity be connected, can also continue drive cold water tank delivery pump and/or when the polymerization kettle reaction has a power failure the hot water tank delivery pump is with the water pump in the water and/or the hot water tank in with the cold water tank to cooling off polymerization kettle, can effectively avoid polymerization kettle (reation kettle) system to break down and when stopping operation, because the too high condition such as quality accident that leads to producing of inside reaction temperature takes place, avoid equipment to stop production, the condition such as equipment damage takes place, improve polymerization kettle reaction unit's emergency treatment ability, improve its work or operational reliability and security.
Preferably, the first and second electrodes are formed of a metal,
the standby generator 15 is a diesel generator; and/or the cold water tank 4 can be cooled by external cooling water 6, and the hot water tank 3 can be heated by external steam 5; and/or the presence of a gas in the gas,
the standby electric energy is also electrically connected with a stirring shaft 2 of the polymerization kettle 1 so as to drive the stirring shaft 2 to carry out polymerization stirring in the polymerization kettle 1.
The standby generator has the advantages that the standby generator has the optimal structure, the diesel generator can generate certain standby electric energy through the combustion of diesel, the power of the standby generator is relatively high, and the provided electric energy is relatively sufficient; the hot water tank can be heated by steam provided by the public and auxiliary media, and the cold water tank can be cooled by cooling water provided by the public and auxiliary media, but once power is cut off, the public and auxiliary media cannot provide steam or cooling water; before the full-range power failure is not recovered, the public and auxiliary media (steam, cooling water and instrument air) can not be normally supplied to the polymerization kettle and related equipment, a steam-free hot water tank can not be heated, a cooling water tank can not be cooled, polymerization mixed upper water can not be supplied according to the corresponding temperature, and the temperature in the polymerization kettle can also deviate from the set value. Because the polymerization process belongs to exothermic reaction, if heat is not transferred out of the polymerization kettle in time, namely the polymerization kettle runs at an over-temperature condition, the operation deviates from the technological indexes, and bumping accidents can happen in serious conditions, so that the main bodies of related equipment are damaged, personnel accidents can be caused, and the subsequent production can not be normally carried out.
When a full-range power failure accident occurs in the polymerization reaction process, the polymerization stirring is stopped, the conveying pump of the polymerization cold and hot water tank is stopped, and the public and auxiliary media required by the polymerization are all in a state of incapable of being supplied. The diesel generator who prepares starts automatically immediately, begins the electricity transmission of generating electricity, resumes partial electric power system, opens polymerization stirring and cold and hot water tank delivery pump in proper order, still electrically connects to the (mixing) shaft through the generator and can drive the (mixing) shaft and continue the stirring action to guarantee the inside continuation operation of polymeric kettle, and make inside continuously can carry out the heat transfer effect with the heat transfer water that provides, guarantee that inside temperature is unlikely to too high.
Preferably, the first and second electrodes are formed of a metal,
the system also comprises a polymerization kettle heat exchange assembly capable of exchanging heat for the polymerization kettle 1, wherein the polymerization kettle heat exchange assembly can be communicated with the mixed water in the cold water tank 4 and the hot water tank 3 so as to cool the polymerization kettle 1;
the system also comprises a fire-fighting water pipeline 17 used for providing fire-fighting water, wherein the fire-fighting water pipeline 17 can also be communicated with the polymerization kettle heat exchange assembly so as to cool the polymerization kettle 1.
This is the utility model discloses a further preferred technical scheme can accept the water of coming through polymeric kettle heat exchange assemblies, play the heat transfer effect to polymeric kettle effectively, in addition the utility model discloses still set up through the intercommunication that sets up the fire water pipeline, make it also can be in polymeric kettle reaction break down for example to cool down the heat dissipation to polymeric kettle when the circumstances such as having a power failure to further avoid the inside reaction temperature of polymeric kettle too high and lead to the circumstances such as quality accident to take place, further improve polymeric kettle reaction unit's emergency treatment ability, improve its work or operational reliability and security.
Preferably, the first and second electrodes are formed of a metal,
the polymerization kettle heat exchange assembly further comprises at least one of a polymerization kettle jacket, a coil pipe and a guide cylinder, and the polymerization kettle jacket is sleeved on the periphery of the polymerization kettle 1. This is the utility model discloses a polymerization kettle heat exchange assemblies's preferred structural style can realize the heat transfer effect to polymerization kettle through leading-in above-mentioned structure with the water pipe, cools off its cooling.
Preferably, the first and second electrodes are formed of a metal,
a fire fighting water return valve 11 is further provided between the fire fighting water line 17 and the polymeric kettle heat exchange assembly along the flow direction of the fire fighting water from the fire fighting water line 17 toward the polymeric kettle heat exchange assembly, and a fire fighting water return valve 12 is further provided between the polymeric kettle heat exchange assembly and the fire fighting water line 17 along the flow direction of the fire fighting water from the polymeric kettle heat exchange assembly toward the fire fighting water line; and/or the presence of a gas in the gas,
the system also comprises a cold and hot water tank water feeding valve 9 and a cold and hot water tank water returning valve 10, wherein water in the cold water tank 4 and the hot water tank 3 is mixed and then communicated with the polymerization kettle heat exchange assembly through the cold and hot water tank water feeding valve 9; and/or the water after heat exchange in the heat exchange component of the polymerization kettle passes through the cold water tank and hot water tank return valve 10 and then is respectively communicated with the cold water tank 4 and the hot water tank 3.
The utility model discloses a various valve structures that set up in order to realize effective intelligent control, can effectively control the water route that the fire-fighting water pipeline got into the polymerizer through the fire-fighting water trap that sets up in above-mentioned position, the supply in time when guaranteeing to have the demand, can carry out effective control to the water route that water after the polymerizer heat transfer flows back to the fire-fighting water pipeline through the fire-fighting water return valve that sets up in above-mentioned position, guarantee that there is timely effectual return water; the water way that water after cold water tank and hot-water tank mix gets into the polymeric kettle can be effectively controlled through the cold water tank water feeding valve that sets up in above-mentioned position, and timely supply when having the demand is guaranteed, can carry out effective control to the water route that flows back to cold water tank and hot-water tank through the cold water tank return valve that sets up in above-mentioned position after the polymeric kettle heat transfer, guarantees to have timely effectual return water.
The inlet and outlet valves of the fire-fighting water pipeline of the on-site polymerization kettle are always opened, when the temperature of the polymerization kettle continuously rises, if the temperature in the polymerization kettle exceeds 75 ℃, the fire-fighting water of the polymerization kettle is started in a chain manner, the water-feeding and water-returning pneumatic valve of the fire-fighting water is automatically opened, the water-feeding and water-returning pneumatic valve of the cold and hot water tank is automatically closed, the polymerization kettle jacket, the coil pipe and the guide cylinder automatically flow into the fire-fighting water with lower temperature, so that the polymerization kettle material is timely cooled
Preferably, the first and second electrodes are formed of a metal,
the polymerization kettle 1 is provided with a pressure safety valve 16, so that when the pressure in the polymerization kettle reaches a preset pressure value (preferably 0.40MPa), the pressure safety valve 16 can be automatically opened to release the pressure; and/or the presence of a gas in the gas,
the system further comprises an emergency groove 13, wherein one outlet of the polymerization kettle 1 can be communicated with the emergency groove 13, and an emergency discharge valve 14 is arranged on a pipeline between the outlet of the polymerization kettle 1 and the emergency groove 13, so that when the temperature in the polymerization kettle reaches a first preset temperature value (preferably 80 ℃), the emergency discharge valve 14 can be automatically opened to discharge the materials in the polymerization kettle.
The utility model also can effectively monitor and control the pressure inside the polymerization kettle through the pressure safety valve arranged on the polymerization kettle, so that the safety valve is opened to release the pressure inside the polymerization kettle when the pressure inside the polymerization kettle exceeds the standard, thereby ensuring the normal pressure inside the polymerization kettle, further improving the emergency treatment capacity of the polymerization kettle reaction device and improving the working or running reliability; still through the emergent discharge valve that sets up on the polymeric kettle, can carry out effective monitoring and control to the inside temperature of polymeric kettle for open this emergent discharge valve in order in time to discharge the inside material of polymeric kettle when the inside temperature of polymeric kettle exceeds standard, guarantee the inside normal temperature of polymeric kettle, further improve polymeric kettle reaction unit's emergent throughput, improve work or operational reliability.
The pressure safety valve is arranged at the top of the polymerization kettle, the boiling point of the acrylonitrile monomer under normal pressure is 77.5 ℃, when the temperature in the kettle reaches the boiling point, a large amount of acrylonitrile monomer volatilizes, the pressure of the kettle is increased rapidly, and when the pressure in the polymerization kettle reaches 0.40MPa, the safety valve is opened automatically to release the pressure, thereby protecting the polymerization kettle and related equipment. When the temperature of the polymerization kettle exceeds 80 ℃, the safety system automatically opens an emergency discharge valve at the lower part of the polymerization kettle to discharge the materials in the polymerization kettle to an emergency tank filled with dimethyl sulfoxide.
The utility model also provides a control method of polymeric kettle emergency treatment system, its use preceding arbitrary polymeric kettle emergency treatment system, whether have a power failure and whether the generator can normally start and carry out according to the polymeric kettle reaction the control whether the generator is opened:
when the polymerization kettle reaction is powered off and the generator can be normally started, the generator is controlled to be started, and the cold water tank delivery pump 8 and/or the hot water tank delivery pump 7 are/is driven to operate.
This is the utility model discloses a control mode of main embodiment (embodiment 1), can also continue to drive the cold water tank delivery pump and/or when the polymerization kettle reaction has a power failure the hot-water tank delivery pump is with the water pump in the water and/or the hot-water tank in with the cold water tank to cooling off the polymerization kettle, can effectively avoid polymerization kettle (reation kettle) system to break down and when the shutdown, because the too high condition such as quality accident that leads to producing of inside reaction temperature takes place, avoid equipment shut down, the condition such as equipment damage to take place, improve polymerization kettle reaction unit's emergency treatment ability, improve its work or operational reliability and security.
Example 1
In the early stage of polymerization (within 5h of the start of a polymerization program or the conversion rate of a monomer is lower than 60%), the polymerization reaction is extremely violent, the reaction heat discharged in unit time is very large, such as full-range power failure, polymerization stirring stop, the conveying pump of a polymerization cold and hot water tank is stopped, and the public and auxiliary media required by polymerization are in a state of being incapable of being supplied. The prepared diesel generator is immediately and automatically started to generate and transmit power, a part of power system is recovered, and the polymerization stirring and cold and hot water tank delivery pump are sequentially started.
Preferably, the first and second electrodes are formed of a metal,
when a fire-fighting water pipeline, a fire-fighting water overflow valve 11 and a fire-fighting water return valve 12 are included, and when the temperature in the polymerization kettle is still higher than a second preset temperature (preferably 75 ℃) after the generator operates for the first time, the fire-fighting water overflow valve 11 and the fire-fighting water return valve 12 are controlled to be opened. Can play further promotion effect to the cooling of polymeric kettle through fire hose line, guarantee that the polymer material is by timely and quick cooling.
1. If the problem of long-time normal power supply can not be solved, the water temperature of the cold water tank continuously rises due to no cooling water supply, so that the water inlet temperature of the polymerization kettle is higher, the temperature of the polymerization kettle can not be maintained within 75 ℃ of the set safe temperature, the fire water of the polymerization kettle is started in a chain manner, the water return pneumatic valve of the fire water is automatically opened, the water return pneumatic valve of the cold water tank is automatically closed, and the jacket, the coil pipe and the guide cylinder of the polymerization kettle automatically flow into the fire water with lower temperature, so that the materials of the polymerization kettle are timely cooled.
2. If the temperature of the polymerization kettle is maintained within 75 ℃ of the set safe temperature, normal power supply is recovered in time, public and auxiliary media (steam, cooling water and instrument air) are normally supplied to the polymerization kettle and relevant equipment, the steam is continuously heated to a hot water tank, the cooling water is used for cooling a cold water tank, and the water inlet temperature of the polymerization kettle is adjusted to a required value capable of maintaining the set temperature of the polymerization kettle.
Preferably, the first and second electrodes are formed of a metal,
when a polymerization kettle reaction is powered off and the generator cannot be normally started, and when a polymerization kettle emergency treatment system further comprises a pressure safety valve 16 and/or an emergency discharge valve 14, and when the temperature in the polymerization kettle is higher than a first preset temperature (preferably 80 ℃) after the power off lasts for a second time, controlling the emergency discharge valve 14 to be opened to discharge the materials in the polymerization kettle; and/or when the pressure in the polymerization kettle is higher than the preset pressure, controlling the pressure safety valve 16 to open so as to release the pressure in the polymerization kettle. This is the embodiment 2 preferred control mode (further improvement on main embodiment basis) of the utility model, make open this relief valve in order to the inside pressure release of polymeric kettle when polymeric kettle internal pressure exceeds standard, guarantee the inside normal pressure of polymeric kettle, and make open this emergent blow-off valve in order to in time discharge to the inside material of polymeric kettle when the inside temperature of polymeric kettle exceeds standard, guarantee the inside normal temperature of polymeric kettle, further improve polymeric kettle reaction unit's emergency treatment ability, improve work or operational reliability.
Example 2
In the early stage of polymerization (within 5h of the start of a polymerization program or the conversion rate of a monomer is lower than 60%), the polymerization reaction is extremely violent, the reaction heat discharged in unit time is very large, such as full-range power failure, polymerization stirring stop, the conveying pump of a polymerization cold and hot water tank is stopped, and the public and auxiliary media required by polymerization are in a state of being incapable of being supplied. The prepared diesel generator can not be started, and the polymerization stirring and cold and hot water tank delivery pump can not be recovered to normal operation (at the moment, the diesel generator can not be started due to the fact that the diesel generator possibly breaks down, at the moment, water in the cold and hot water tank can not be driven to cool the polymerization kettle and can not drive the stirring shaft for stirring, so that even if a fire-fighting water pipeline is started, heat can be dissipated to the periphery of the polymerization kettle in a small range, the inside of the polymerization kettle can not be effectively cooled, and the fire-fighting water pipeline is not selected to be.
1. If the temperature of the polymerization kettle is maintained within 75 ℃ (the second preset temperature), the normal power supply is recovered in time, the public and auxiliary media (steam, cooling water and instrument air) are normally supplied to the polymerization kettle and related equipment, the steam continues to heat the hot water tank, the cooling water cools the cold water tank, and the water inlet temperature of the polymerization kettle is adjusted to the required value capable of maintaining the set temperature of the polymerization kettle.
2. If normal power supply in a short time cannot be solved, the stirring of the polymerization kettle cannot work, and the temperature of the polymerization kettle quickly reaches the safe temperature of 75 ℃ or even higher. When the temperature in the kettle reaches 77.5 ℃ of the boiling point of the acrylonitrile monomer, a large amount of the acrylonitrile monomer volatilizes, so that the pressure of the kettle body is rapidly increased, and when the pressure in the polymerization kettle reaches 0.40MPa, the safety valve is automatically opened to release the pressure. When the temperature of the polymerization kettle exceeds 80 ℃ (the first preset temperature), the safety system automatically opens an emergency discharge valve at the lower part of the polymerization kettle, and discharges the materials in the polymerization kettle to an emergency tank filled with dimethyl sulfoxide.
Example 3
Preferably, the first and second electrodes are formed of a metal,
when the operation of the polymerization stirring is suddenly stopped and after the sudden stop of the operation lasts for a third time, if the temperature in the polymerization kettle is higher than a first preset temperature, controlling the emergency discharge valve 14 to be opened so as to discharge the materials in the polymerization kettle; and/or controlling the pressure relief valve 16 to be opened to release the pressure in the polymerization kettle if the pressure in the polymerization kettle is higher than the preset pressure. This is the preferred control mode of embodiment 3 of the present invention, can realize reliable control, prevent that its internal pressure and temperature from exceeding standard and leading to the accident when polymerization stirring stops the operation suddenly (the polymerization stirring stop operation suddenly here usually means that polymerization stirring and relevant structure break down, also can not realize effective cooling to polymerization kettle inside if open the generator or open the fire water pipeline this moment, consequently do not choose to open).
The polymerization reaction is extremely violent in the early stage (the polymerization procedure is started within 5 hours or the monomer conversion rate is lower than 60%), the reaction heat discharged in unit time is very large, and the operation of the polymerization kettle is suddenly stopped when stirring.
1. If the temperature of the polymerization kettle is maintained within 75 ℃ of the set safe temperature, the stirring of the polymerization kettle is recovered in time, and the temperature of the polymerization kettle is reduced to the set value.
2. If the stirring of the polymerization kettle can not be operated for a short time, the temperature of the polymerization kettle quickly reaches the safe temperature of 75 ℃ or even higher. When the temperature in the kettle reaches 77.5 ℃ of the boiling point of the acrylonitrile monomer, a large amount of the acrylonitrile monomer volatilizes, so that the pressure of the kettle body is rapidly increased, and when the pressure in the polymerization kettle reaches 0.40MPa, the safety valve is automatically opened to release the pressure. When the temperature of the polymerization kettle exceeds 80 ℃, the safety system automatically opens an emergency discharge valve at the lower part of the polymerization kettle to discharge the materials in the polymerization kettle to an emergency tank filled with dimethyl sulfoxide.
Example 4
When the water circulation system of the polymerization kettle has a fault and further comprises a fire water pipeline 17, a fire water overflow valve 11 and a fire water return valve 12, and after the fault lasts for a third time, if the temperature in the polymerization kettle is higher than a second preset temperature (preferably 75 ℃), the fire water overflow valve 11 and the fire water return valve 12 are controlled to be opened. This is the utility model discloses an embodiment 4's preferred control mode can realize reliable control, through the effectual cooling of realization of fire hose line to the polymerizer inside when the water circulating system of polymerizer breaks down, prevents that its internal pressure and temperature from exceeding standard and leading to the accident (can alternatively adopt fire hose line to dispel the heat the cooling to the polymerizer when the water circulating system breaks down here, replaces microthermal cooling water with a large amount of fire water and realizes the cooling).
In the early stage of polymerization reaction (the polymerization procedure is started within 5 hours or the monomer conversion rate is lower than 60%), the polymerization reaction is extremely violent, the reaction heat released in unit time is very large, a water circulating system has faults (a main water feeding pipe, a main water returning pipe or each branch water feeding pipe of a polymerization kettle), such as a pneumatic valve fault, large-area water leakage at a pipeline flange can cause the over-temperature operation of the reaction kettle.
1. If the temperature of the polymerization kettle is maintained within 75 ℃ of the set safe temperature, the water circulation system of the polymerization kettle is recovered in time, and the temperature of the polymerization kettle is reduced to the set value.
2. If long-time water circulating system can not be recovered, the polymerization kettle can not be fed with water and returned with water, or the water quantity is insufficient, the temperature of the polymerization kettle is too high and the temperature of the polymerization kettle can not be maintained within 75 ℃ of the set safe temperature, the fire-fighting water of the polymerization kettle is started in a chain manner, the fire-fighting water return pneumatic valve is automatically opened, the cold and hot water tank water return pneumatic valve is automatically closed, and the polymerization kettle jacket, the coil pipe and the guide cylinder automatically flow into the fire-fighting water with lower temperature, so that the polymerization kettle material can be timely cooled.
Example 5
And controlling the generator to start and drive the cold water tank delivery pump 8 and/or the hot water tank delivery pump 7 to operate if the polymerization kettle has power failure and the generator can be normally started at the later stage of the polymerization reaction (after the polymerization program is started for 8 hours or the monomer conversion rate is higher than 85%). This is the utility model discloses an embodiment 5's preferred control mode can realize reliable control, realize effectual cooling to the polymerization kettle inside through the generator when polymerization later stage, prevents that its internal pressure and temperature from exceeding standard and leading to the accident to appear.
In the latter stage of the polymerization reaction (after 8 hours from the start of the polymerization procedure or at a monomer conversion of more than 85%), the polymerization reaction tends to be gentle due to the decrease in the monomer concentration in the polymerization liquid, and the heat of reaction released per unit time is small. If a full-range power failure occurs, the polymerization stirring is stopped, the conveying pump of the polymerization cold and hot water tank is stopped, and the auxiliary media required by the polymerization are all in a state of being incapable of being supplied.
1. The prepared diesel engine is automatically started immediately, power generation and transmission are started, a part of power system is recovered, and the polymerization stirring and cold-hot water tank delivery pump are started in sequence, so that the temperature of the polymerization kettle is maintained at the set operating temperature, and the product index is ensured to be within the qualified range.
2. If the diesel generator is not started in the range allowed by the index at the end stage of the reaction, standing and waiting for the next demonomerization process.
Example 6
When a fault occurs in the middle stage of the polymerization reaction, the optimal treatment mode in the above embodiments is selected according to the specific temperature in the polymerization kettle.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A polymerizer emergency treatment system, which is characterized in that: the method comprises the following steps:
the system comprises a polymerization kettle (1), a cold water tank (4), a hot water tank (3), a cold water tank delivery pump (8) and a hot water tank delivery pump (7), wherein the cold water tank delivery pump (8) is used for driving water in the cold water tank (4) to flow, the hot water tank delivery pump (7) is used for driving water in the hot water tank (3) to flow, and the water in the cold water tank (4) and the hot water tank (3) is mixed and then used for heating and cooling the polymerization kettle (1);
the system also comprises a standby generator (15), wherein the standby generator (15) can generate standby electric energy, and the standby electric energy is electrically connected to the cold water tank conveying pump (8) and/or the hot water tank conveying pump (7) to drive the cold water tank conveying pump (8) and/or the hot water tank conveying pump (7) to operate.
2. The polymerizer emergency treatment system according to claim 1, wherein:
the standby generator (15) is a diesel generator; and/or the cold water tank (4) can be cooled by external cooling water (6), and the hot water tank (3) can be heated by external steam (5).
3. The polymerizer emergency treatment system according to claim 1, wherein:
the standby electric energy is also electrically connected with a stirring shaft (2) of the polymerization kettle (1) to drive the stirring shaft (2) to perform polymerization stirring in the polymerization kettle (1).
4. The polymeric kettle emergency treatment system of any one of claims 1 to 3, wherein:
the system is characterized by further comprising a polymerization kettle heat exchange assembly capable of exchanging heat for the polymerization kettle (1), wherein the polymerization kettle heat exchange assembly can be communicated with the mixed water in the cold water tank (4) and the hot water tank (3) so as to cool the polymerization kettle (1).
5. The polymerizer emergency treatment system according to claim 4, wherein:
the polymerization kettle heat exchange assembly further comprises at least one of a polymerization kettle jacket, a coil pipe and a guide cylinder, and the polymerization kettle jacket is sleeved on the periphery of the polymerization kettle (1).
6. The polymerizer emergency treatment system according to claim 4, wherein:
still including being used for providing fire water's fire water pipeline (17), fire water pipeline (17) also can with polymerizer heat exchange assemblies intercommunication to the cooling is carried out to polymerizer (1).
7. The polymerizer emergency treatment system according to claim 6, wherein:
along the flowing direction of fire water from the fire water pipeline (17) to the polymeric kettle heat exchange assembly, a fire water inlet valve (11) is further arranged between the fire water pipeline (17) and the polymeric kettle heat exchange assembly, and along the flowing direction of fire water from the polymeric kettle heat exchange assembly to the fire water pipeline, a fire water return valve (12) is further arranged between the polymeric kettle heat exchange assembly and the fire water pipeline (17).
8. The polymerizer emergency treatment system according to claim 4, wherein:
the system also comprises a cold and hot water tank water feeding valve (9) and a cold and hot water tank water return valve (10), wherein water in the cold water tank (4) and water in the hot water tank (3) are mixed and then communicated with the polymerization kettle heat exchange assembly through the cold and hot water tank water feeding valve (9); and/or the water subjected to heat exchange in the polymerization kettle heat exchange assembly passes through the cold water tank and hot water tank return valve (10) and then is respectively communicated with the cold water tank (4) and the hot water tank (3).
9. The polymeric kettle emergency treatment system of any one of claims 1 to 3, wherein:
the polymerization kettle (1) is provided with a pressure safety valve (16), and when the pressure in the polymerization kettle reaches a preset pressure value, the pressure safety valve (16) can be automatically opened to release the pressure.
10. The polymeric kettle emergency treatment system of any one of claims 1 to 3, wherein:
still include emergent groove (13), one of them export of polymeric kettle (1) can with emergent groove (13) intercommunication, above-mentioned export of polymeric kettle (1) with be provided with emergent discharge valve (14) on the pipeline between emergent groove (13) to when the temperature reaches first preset temperature value in the polymeric kettle, emergent discharge valve (14) can be opened automatically with will material in the polymeric kettle discharges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096054.7U CN210449158U (en) | 2019-07-12 | 2019-07-12 | Polymerization kettle emergency treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096054.7U CN210449158U (en) | 2019-07-12 | 2019-07-12 | Polymerization kettle emergency treatment system |
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| CN210449158U true CN210449158U (en) | 2020-05-05 |
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| CN201921096054.7U Active CN210449158U (en) | 2019-07-12 | 2019-07-12 | Polymerization kettle emergency treatment system |
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| CN (1) | CN210449158U (en) |
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