CN212747066U - Thick chloroethylene device of condensation - Google Patents
Thick chloroethylene device of condensation Download PDFInfo
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- CN212747066U CN212747066U CN202020796874.3U CN202020796874U CN212747066U CN 212747066 U CN212747066 U CN 212747066U CN 202020796874 U CN202020796874 U CN 202020796874U CN 212747066 U CN212747066 U CN 212747066U
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Abstract
The utility model belongs to the technical field of chemical condensation, in particular to a device for condensing crude chloroethylene, which is characterized in that a chloroethylene compressor is connected with a crude chloroethylene drying system through a post-cooler, the crude chloroethylene drying system is connected with a first section of total condenser, the first section of total condenser is respectively connected with a chloroethylene storage tank and a second section of total condenser, and the second section of total condenser is also respectively connected with the chloroethylene storage tank and one end of a tail cooler; the other end of the tail cooler is connected with a tail gas adsorption system, and one end of the tail cooler is connected to a pipeline between the two-stage total condenser and the vinyl chloride storage tank; the chloroethylene storage tank is connected with the liquid-phase chloroethylene rectification system through a pump; wherein, the first-stage complete condenser is an air cooler. The air cooler is adopted to cool and condense the washed and compressed crude chloroethylene gas, and air cooling is used for replacing water cooling, so that a large amount of circulating water consumption can be saved, the cooling effect is obvious, and the economic benefit and the social benefit are obvious.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry condensation, especially, relate to a thick chloroethylene device of condensation is applied to the condensation of the thick chloroethylene of acetylene method chloroethylene device rectification process.
Background
Vinyl chloride, also known as Vinyl chloride, is an important monomer used in polymer chemistry and can be prepared from ethylene or acetylene.
In the synthesis reaction of acetylene method chloroethylene, crude chloroethylene gas generated by the reaction of an acetylene method chloroethylene device is sent to a condenser after cooling, water and alkali washing, mercury removal and compression, and then sent to a rectification working section for purification or other working procedures after being gradually cooled and condensed by a first-stage complete condenser, a second-stage complete condenser and a tail gas cooler respectively.
A conventional one-stage total condenser adopts a tube type heat exchanger, the heat load of the heat exchanger is large, and a large amount of circulating water is required to cool and condense crude chloroethylene. The water cooling is adopted, circulating water sewage needs to be continuously discharged and fresh water needs to be supplemented, and the problem of water sources needs to be considered when plant sites are selected. Meanwhile, because water is corrosive and microorganisms are easily generated in the circulating process, the tubes of the heat exchanger are easily scaled and attached to the surface of the heat exchanger, so that the heat exchange efficiency is reduced, and shutdown and cleaning are often needed. When the power supply is cut off and no circulating water exists, the device is forced to stop production.
Particularly for northern water-deficient areas, the air temperature is low and dry, circulating water is used as a cooling medium in the tubular heat exchanger, a large amount of circulating water is needed, and the technical problem of insufficient water source sometimes exists.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a thick chloroethylene device of condensation adopts the air cooler to cool off the condensation with the thick chloroethylene gas after the washing compression to the air cooling replaces the water-cooling, can save a large amount of circulating water consumption, and the cooling effect is obvious, has obvious economic benefits and social.
Solve above technical problem the utility model provides a device of thick chloroethylene of condensation, its characterized in that: the device comprises a chloroethylene compressor, a post-machine cooler, a crude chloroethylene drying system, a first-stage total condenser, a second-stage total condenser, a tail gas cooler, a tail gas adsorption system, a chloroethylene storage tank and a liquid-phase chloroethylene rectification system, wherein the chloroethylene compressor is connected with the crude chloroethylene drying system through the post-machine cooler; the other end of the tail cooler is connected with a tail gas adsorption system, and one end of the tail cooler is connected to a pipeline between the two-stage total condenser and the vinyl chloride storage tank; the chloroethylene storage tank is connected with the liquid-phase chloroethylene rectification system through a pump; wherein, the first-stage complete condenser is an air cooler. The above instruments and equipment are mutually connected through pipelines, and liquid-phase chloroethylene is pumped from a downstream liquid-phase chloroethylene rectifying system.
The air cooler is sequentially provided with a fan motor, a fan, a cooling coil and a shutter from top to bottom, and the fan motor is connected with the fan; the cooling coil comprises a light pipe and fins, the fins are arranged on the outer surface of the light pipe, hot vinyl chloride gas flows in the light pipe, and air brought by the fan blows outside the light pipe to increase heat dissipation; the cooling coil is connected with a chloroethylene medium inlet main pipe orifice, a chloroethylene medium outlet gas phase main pipe orifice and a chloroethylene medium outlet liquid phase main pipe orifice, one end of the chloroethylene medium inlet main pipe orifice is connected with the crude chloroethylene drying system, and the other end of the chloroethylene medium inlet main pipe orifice is connected with the cooling coil; one end of a chloroethylene medium outlet gas-phase main pipe orifice and one end of a chloroethylene medium outlet liquid-phase main pipe orifice are vertically arranged, the other end of the chloroethylene medium outlet gas-phase main pipe orifice is connected with the two sections of full condensers, and the other end of the chloroethylene medium outlet liquid-phase main pipe orifice is connected with a chloroethylene storage tank; the outlet end of the cooling coil is connected with a gas-phase main pipe orifice of a chloroethylene medium outlet and a liquid-phase main pipe orifice of a chloroethylene medium outlet.
The air cooler can also be provided with an outer frame, and the cooling coil provided with the fins is arranged in the outer frame.
The cooling coil pipe of the utility model is not connected with the fan motor and the fan, and is independent; the shutter is also not directly connected with the fan motor, the fan and the cooling coil and is independent. The fan motor is connected with an external power supply end.
A method for condensing crude chloroethylene comprises a compression step, an after-machine cooling step, a first-stage full condensation step, a second-stage full condensation step and a tail cooling step, wherein the condensation in the first-stage full condensation step is in an air cooling mode.
In the utility model, crude chloroethylene gas is condensed by a chloroethylene compressor, a post-machine cooler, a crude chloroethylene drying system and an air cooler in sequence, uncondensed gas enters a two-stage full condenser and a tail cooler for further condensation, and uncondensed gas enters a tail gas adsorption system for adsorption; and the condensate in the air cooler, the two-stage complete condenser and the tail cooler enters a chloroethylene storage tank, and then the liquid-phase chloroethylene is purified in a chloroethylene rectification system by a pump.
The pressure of the crude chloroethylene gas before entering the condensation step is 0.64-0.65 MPaG, the temperature is 60-65 ℃, and the pressure in the optimized scheme is 0.645MPaG, and the temperature is 60 ℃. Insufficient pressure or low temperature may result in premature condensation or liquid formation of vinyl chloride gas. And the arrangement of a section of condenser on the top frame of the rectification also causes the occurrence of vapor lock.
The cooling coil is a special-shaped coil group structure.
The light pipe and the fan can be not directly connected and are positioned on the upper part of the light pipe, so long as wind energy blows to the light pipe.
The fins are of a header type fin structure, so that the heat transfer area is increased conveniently. The header fin structure is conventional. The fins are made of 08# steel with high heat conductivity and are embedded on a light pipe made of 10# steel. Because the heat transfer coefficient of the air side is very small, radial fins are additionally arranged on the light pipe to increase the heat transfer area and the fluid turbulence and reduce the thermal resistance.
The height of the fins is 12-13m, and the height of the fins in the optimized scheme is 12.5 mm; the outer diameter of a light pipe in the air cooler is 20-30mm, and the outer diameter in the optimized scheme is 25 mm.
The fan is an axial flow fan, the ventilation quantity required by heat exchange is large, and the required air pressure is not high.
The fan motor is a variable frequency motor, and meanwhile, the operation signal of the motor is sent into the DCS, so that the real-time detection and control of the fan operation condition are facilitated.
A spray water cooling structure is also arranged in the air cooler; the spray water cooling structure is provided with a sprayer, a liquid header pipe, a branch pipe, a circulating pump and a water receiving tank, wherein the branch pipe is connected with the sprayer, the sprayer is connected to the surface of the liquid header pipe through the branch pipe, and the sprayer and the branch pipe are communicated with the liquid header pipe; the circulating pump is connected with one end of the liquid header pipe, and the water receiving tank is used for storing and receiving water; the circulating pump and the water receiving tank are positioned below a louver at the bottom of the air cooler, and the sprayer is positioned at the upper part of the cooling coil; the sprayed water is sent to the liquid header pipe from the water receiving tank through the circulating pump, is uniformly sprayed to the upper part of the cooling coil pipe through the sprayer after being distributed by the branch pipes so as to increase the heat exchange effect, and the sprayed water is collected by the water receiving tank; the water cooling and air cooling modes are combined together, so that the heat dissipation and cooling are faster, and the heat dissipation effect is improved.
In order to enhance the heat transfer effect of the air cooler, when the air temperature is very high, the spray type wet air cooler is adopted, the spray type wet air cooler directly sprays water on the fin tube bundle, and the latent heat exchange of water evaporation and the humidification and cooling of air are utilized to enhance the heat transfer, so that the air temperature is reduced, and the heat transfer coefficient is increased; when the temperature is low, spray water is not needed to be opened, so that the device can achieve the purpose of conveying at various temperatures. The spray water cooling structure adopts an advanced and reasonable water distribution system to distribute water uniformly, so that the cooling water is contacted with the cooling coil pipe to the maximum extent.
The water receiving tank is provided with a tank body side surface and a bottom plate, a water supplementing pipe opening, a drain outlet and an overflow opening, the water receiving tank is hollow, the water supplementing opening and the overflow opening are arranged at the upper part of the tank body side surface, and the water supplementing opening is automatically adjusted by a ball float valve; the bottom plate of the water receiving tank is inclined, and the drain outlet is arranged at the lowest point of the bottom plate of the water tank. The water replenishing pipe and the overflow port can be arranged on one side of the side surface of the box body, can also be arranged on different sides, and can also be equal in height from the bottom surface.
The cooling coil is subjected to hot dip galvanizing treatment, wherein the treatment temperature is 470-480 ℃; the treatment temperature in the optimized scheme is 475 ℃, the corrosion resistance is improved, the possibility of scaling is reduced, and the heat transfer coefficient between the inside and the outside of the pipe is improved.
The shutter is also provided with a protective net which is positioned at one side of the shutter in parallel.
The utility model discloses in be applied to the thick chloroethylene condensation technique of acetylene method chloroethylene device rectification process, adopt the air cooler to cool off the condensation with the thick chloroethylene gas after the washing compression to the air cooling replaces the water-cooling, can save a large amount of circulating water consumption, has obvious economic benefits and social.
The air cooler has no thermal pollution and chemical pollution to the environment, the air can be obtained at will, the auxiliary equipment and the cost are not needed, the plant site selection is not limited, and the limitation of areas without water and water is avoided. And the air corrosion is small, the descaling and cleaning are not needed, and the service life is long. Once the power supply of the fan is cut off, the air cooler still has 30% -40% of natural cooling capacity.
The utility model discloses the hollow cooler can survive the test of the hot weather of northern area summer, and the operation is stable, and the cooling effect is obvious, especially to northern water shortage area, utilizes its temperature low, dry characteristics, replaces the circulating water with cold air to be coolant, replaces conventional shell and tube heat exchanger with the air cooler, can save a large amount of circulating water, alleviates the contradiction that the water source is not enough. The bottleneck of shortage of water consumption in the north is solved, the economic benefit is obvious, and the air cooling is used for replacing the traditional water cooling, so that the method has good popularization prospect.
Drawings
FIG. 1 is a flow chart of the process for condensing crude vinyl chloride gas in the present invention
FIG. 2 is a schematic view of the front structure of the hollow cooler of the present invention
FIG. 3 is a schematic view of the side structure of the hollow cooler of the present invention
FIG. 4 is a schematic view of the top surface structure of the hollow cooler of the present invention
Wherein the labels in the figure are specifically:
1. vinyl chloride compressor, 2. after-machine cooler, 3. crude vinyl chloride drying system, 4. first-stage complete condenser or air cooler, 5. second-stage complete condenser, 6. tail gas adsorption system, 7. tail gas cooler, 8. vinyl chloride storage tank, 9. liquid phase vinyl chloride rectification system, 10. pump, 11. fan, 12. fan motor, 13. sprayer, 14. cooling coil, 15. shutter, 16. circulating pump, 17. water receiving tank, 18. liquid main pipe, 19. outer frame, 20. light pipe, 21. fin, 22. branch pipe, G11. vinyl chloride medium inlet branch pipe, G12. vinyl chloride medium outlet branch pipe, G13. vinyl chloride medium inlet main pipe orifice, G14. vinyl chloride medium outlet gas phase main pipe orifice, G15. vinyl chloride medium outlet liquid phase main pipe orifice, G01. water supplementing pipe orifice, G02. sewage discharge outlet, G03. overflow outlet
Detailed Description
The present invention will be further described with reference to the following specific embodiments, in which the vinyl chloride compressor, the post-cooler, the rough vinyl chloride drying system, the two-stage total condenser, the tail gas adsorption system, the tail gas cooler, the vinyl chloride storage tank, the liquid-phase vinyl chloride rectification system and the pump are conventional devices:
example 1
A device for condensing crude chloroethylene is provided with a chloroethylene compressor, a post-machine cooler, a crude chloroethylene drying system, an air cooler, a first section total condenser, a second section total condenser, a tail gas adsorption system, a tail gas cooler, a chloroethylene storage tank, a liquid-phase chloroethylene rectification system and a pump, wherein the chloroethylene compressor is connected with the crude chloroethylene drying system through the post-machine cooler; the other end of the tail cooler is connected with a tail gas adsorption system, and one end of the tail cooler is connected to a pipeline between the two-stage total condenser and the vinyl chloride storage tank; the chloroethylene storage tank is connected with the liquid-phase chloroethylene rectification system through a pump; wherein, the first-stage complete condenser is an air cooler. The instruments and the equipment are mutually connected through pipelines.
The air cooler is sequentially provided with a fan motor, a fan, a cooling coil and a shutter from top to bottom, and the fan motor is connected with the fan; the cooling coil comprises a light pipe and fins, the fins are arranged on the outer surface of the light pipe, hot vinyl chloride gas flows in the light pipe, and air brought by the fan blows outside the light pipe to increase heat dissipation; the cooling coil is connected with a chloroethylene medium inlet main pipe orifice, a chloroethylene medium outlet gas phase main pipe orifice and a chloroethylene medium outlet liquid phase main pipe orifice, one end of the chloroethylene medium inlet main pipe orifice is connected with the crude chloroethylene drying system, and the other end of the chloroethylene medium inlet main pipe orifice is connected with the cooling coil; one end of a chloroethylene medium outlet gas-phase main pipe orifice and one end of a chloroethylene medium outlet liquid-phase main pipe orifice are vertically arranged, the other end of the chloroethylene medium outlet gas-phase main pipe orifice is connected with the two sections of full condensers, and the other end of the chloroethylene medium outlet liquid-phase main pipe orifice is connected with a chloroethylene storage tank; the outlet end of the cooling coil is connected with a gas-phase main pipe orifice of a chloroethylene medium outlet and a liquid-phase main pipe orifice of a chloroethylene medium outlet. The cooling coil is a special-shaped coil group structure.
The chloroethylene medium inlet branch pipe is divided into 4 branch pipes by a chloroethylene medium inlet main pipe, so that uniform flow distribution is facilitated. The chloroethylene medium outlet branch pipes are collected to a chloroethylene medium inlet header pipe by 4 branch pipes, so that the chloroethylene medium outlet branch pipes are collected and discharged after being uniformly distributed.
When the air cooler is used, the chloroethylene medium inlet main pipe opening G13 enters a light pipe to flow, and after air cooling, gas flows out of the chloroethylene medium outlet gas phase main pipe opening G14 and enters a two-stage total condenser for treatment; the liquid phase comes out from a liquid phase main pipe opening G15 of a vinyl chloride medium outlet and then enters a polyethylene storage tank for treatment.
The cooling coil is not connected with the fan motor and the fan and is independent; the shutter is also not directly connected with the fan motor, the fan and the cooling coil and is independent. The fan motor is connected with an external power supply end. The light pipe and the fan can be not directly connected and are positioned on the upper part of the light pipe, so long as wind energy blows to the light pipe.
The fins are of a header type fin structure, so that the heat transfer area is increased conveniently. The header fin structure is conventional. The fins are made of 08# steel with high heat conductivity and are embedded on a light pipe made of 10# steel. Because the heat transfer coefficient of the air side is very small, radial fins are additionally arranged on the light pipe to increase the heat transfer area and the fluid turbulence and reduce the thermal resistance.
The height of the fins is 13m, and the outer diameter of a light pipe in the air cooler is 30 mm. The cooling coil is subjected to hot dip galvanizing treatment, the treatment temperature is 480 ℃, the corrosion resistance is improved, the possibility of scaling is reduced, and the heat transfer coefficient inside and outside the pipe is improved.
The fan is an axial flow fan, the ventilation quantity required by heat exchange is large, and the required air pressure is not high. The fan motor is a variable frequency motor, and meanwhile, the operation signal of the motor is sent into the DCS, so that the real-time detection and control of the fan operation condition are facilitated.
Example 2
A device for condensing crude chloroethylene is provided with a chloroethylene compressor, a post-machine cooler, a crude chloroethylene drying system, an air cooler, a first section total condenser, a second section total condenser, a tail gas adsorption system, a tail gas cooler, a chloroethylene storage tank, a liquid-phase chloroethylene rectification system and a pump, wherein the chloroethylene compressor is connected with the crude chloroethylene drying system through the post-machine cooler; the other end of the tail cooler is connected with a tail gas adsorption system, and one end of the tail cooler is connected to a pipeline between the two-stage total condenser and the vinyl chloride storage tank; the chloroethylene storage tank is connected with the liquid-phase chloroethylene rectification system through a pump; wherein, the first-stage complete condenser is an air cooler. The instruments and the equipment are mutually connected through pipelines.
The air cooler is sequentially provided with a fan motor, a fan, a cooling coil and a shutter from top to bottom, and the fan motor is connected with the fan; the cooling coil comprises a light pipe and fins, the fins are arranged on the outer surface of the light pipe, hot vinyl chloride gas flows in the light pipe, and air brought by the fan blows outside the light pipe to increase heat dissipation; the cooling coil is connected with a chloroethylene medium inlet main pipe orifice, a chloroethylene medium outlet gas phase main pipe orifice and a chloroethylene medium outlet liquid phase main pipe orifice, one end of the chloroethylene medium inlet main pipe orifice is connected with the crude chloroethylene drying system, and the other end of the chloroethylene medium inlet main pipe orifice is connected with the cooling coil; one end of a chloroethylene medium outlet gas-phase main pipe orifice and one end of a chloroethylene medium outlet liquid-phase main pipe orifice are vertically arranged, the other end of the chloroethylene medium outlet gas-phase main pipe orifice is connected with the two sections of full condensers, and the other end of the chloroethylene medium outlet liquid-phase main pipe orifice is connected with a chloroethylene storage tank; the outlet end of the cooling coil is connected with a gas-phase main pipe orifice of a chloroethylene medium outlet and a liquid-phase main pipe orifice of a chloroethylene medium outlet. The cooling coil is a special-shaped coil group structure.
The chloroethylene medium inlet branch pipe is divided into 4 branch pipes by a chloroethylene medium inlet main pipe, so that uniform flow distribution is facilitated. The chloroethylene medium outlet branch pipes are collected to a chloroethylene medium inlet header pipe by 4 branch pipes, so that the chloroethylene medium outlet branch pipes are collected and discharged after being uniformly distributed.
The air cooler can also be provided with an outer frame, and the cooling coil provided with the fins is arranged in the outer frame. The cooling coil is not connected with the fan motor and the fan and is independent; the shutter is also not directly connected with the fan motor, the fan and the cooling coil and is independent. The fan motor is connected with an external power supply end. The light pipe and the fan can be not directly connected and are positioned on the upper part of the light pipe, so long as wind energy blows to the light pipe.
The fins are of a header type fin structure, so that the heat transfer area is increased conveniently. The header fin structure is conventional. The fins are made of 08# steel with high heat conductivity and are embedded on a light pipe made of 10# steel. Because the heat transfer coefficient of the air side is very small, radial fins are additionally arranged on the light pipe to increase the heat transfer area and the fluid turbulence and reduce the thermal resistance.
The height of the fins is 12m, and the outer diameter of a light pipe in the air cooler is 20 mm. The cooling coil is subjected to hot dip galvanizing treatment, and the treatment temperature is 470 ℃. The fan is an axial flow fan, the ventilation quantity required by heat exchange is large, and the required air pressure is not high. The fan motor is a variable frequency motor, and meanwhile, the operation signal of the motor is sent into the DCS, so that the real-time detection and control of the fan operation condition are facilitated.
The air cooler is also internally provided with a spray water cooling structure, and the water cooling and air cooling modes are combined together, so that the heat dissipation and cooling are faster.
A spray water cooling structure is also arranged in the air cooler; the spray water cooling structure is provided with a sprayer, a liquid header pipe, a branch pipe, a circulating pump and a water receiving tank, wherein the branch pipe is connected with the sprayer, the sprayer is connected to the surface of the liquid header pipe through the branch pipe, and the sprayer and the branch pipe are communicated with the liquid header pipe; the circulating pump is connected with one end of the liquid header pipe, and the water receiving tank is used for storing and receiving water; the circulating pump and the water receiving tank are positioned below a louver at the bottom of the air cooler, and the sprayer is positioned at the upper part of the cooling coil; the sprayed water is sent to the liquid header pipe from the water receiving tank through the circulating pump, is uniformly sprayed to the upper part of the cooling coil pipe through the sprayer after being distributed by the branch pipes so as to increase the heat exchange effect, and the sprayed water is collected by the water receiving tank; the water cooling and air cooling modes are combined together, so that the heat dissipation and cooling are faster, and the heat dissipation effect is improved.
In order to enhance the heat transfer effect of the air cooler, when the air temperature is very high, the spray type wet air cooler is adopted, the spray type wet air cooler directly sprays water on the fin tube bundle, and the latent heat exchange of water evaporation and the humidification and cooling of air are utilized to enhance the heat transfer, so that the air temperature is reduced, and the heat transfer coefficient is increased; when the temperature is low, spray water is not needed to be opened, so that the device can achieve the purpose of conveying at various temperatures. The spray water cooling structure adopts an advanced and reasonable water distribution system to distribute water uniformly, so that the cooling water is contacted with the cooling coil pipe to the maximum extent.
The water receiving tank is provided with a tank body side surface and a bottom plate, a water supplementing pipe opening, a drain outlet and an overflow opening, the water receiving tank is hollow, the water supplementing opening and the overflow opening are arranged at the upper part of the tank body side surface, and the water supplementing opening is automatically adjusted by a ball float valve; the bottom plate of the water receiving tank is inclined, and the drain outlet is arranged at the lowest point of the bottom plate of the water tank. The water replenishing pipe and the overflow port can be arranged on one side of the side surface of the box body, can also be arranged on different sides, and can also be equal in height from the bottom surface.
Although desalted water is used for circulating cooling, after the desalted water is used for a period of time, dust and impurities contained in the air are accumulated in the water receiving tank continuously, the water quality becomes turbid, the heat transfer efficiency of the cooling coil is reduced, and therefore the desalted water needs to be drained and replaced periodically. The device should be protected in winter when shutting down to prevent frostbite to the circulating pump, and the low point is put clean circulation pump case internal water in order to avoid the frost crack pump body. The protective net and the filter screen need to be cleaned regularly so as to avoid affecting the condensation effect.
Example 3
A device for condensing crude chloroethylene is provided with a chloroethylene compressor, a post-machine cooler, a crude chloroethylene drying system, an air cooler, a first section total condenser, a second section total condenser, a tail gas adsorption system, a tail gas cooler, a chloroethylene storage tank, a liquid-phase chloroethylene rectification system and a pump, wherein the chloroethylene compressor is connected with the crude chloroethylene drying system through the post-machine cooler; the other end of the tail cooler is connected with a tail gas adsorption system, and one end of the tail cooler is connected to a pipeline between the two-stage total condenser and the vinyl chloride storage tank; the chloroethylene storage tank is connected with the liquid-phase chloroethylene rectification system through a pump; wherein, the first-stage complete condenser is an air cooler. The instruments and the equipment are mutually connected through pipelines.
The cooler is sequentially provided with a fan motor, a fan, a cooling water main pipe, a branch pipe, a sprayer, a cooling coil, a shutter, a water receiving tank and a circulating pump from top to bottom. Simultaneously, the air cooler is also provided with an outer frame, the cooling coil and the water receiving box are arranged in the outer frame, the cooling coil is provided with fins, chloroethylene hot gas flows in the cooling coil, air brought by the fan blows outside the tube bundle, and cooling water is sprayed outside the tube bundle from the upper part to increase heat dissipation.
The air cooler is sequentially provided with a fan motor, a fan, a cooling coil and a shutter from top to bottom, and the fan motor is connected with the fan; the cooling coil comprises a light pipe and fins, the fins are arranged on the outer surface of the light pipe, hot vinyl chloride gas flows in the light pipe, and air brought by the fan blows outside the light pipe to increase heat dissipation; the cooling coil is connected with a chloroethylene medium inlet main pipe orifice, a chloroethylene medium outlet gas phase main pipe orifice and a chloroethylene medium outlet liquid phase main pipe orifice, one end of the chloroethylene medium inlet main pipe orifice is connected with the crude chloroethylene drying system, and the other end of the chloroethylene medium inlet main pipe orifice is connected with the cooling coil; one end of a chloroethylene medium outlet gas-phase main pipe orifice and one end of a chloroethylene medium outlet liquid-phase main pipe orifice are vertically arranged, the other end of the chloroethylene medium outlet gas-phase main pipe orifice is connected with the two sections of full condensers, and the other end of the chloroethylene medium outlet liquid-phase main pipe orifice is connected with a chloroethylene storage tank; the outlet end of the cooling coil is connected with a gas-phase main pipe orifice of a chloroethylene medium outlet and a liquid-phase main pipe orifice of a chloroethylene medium outlet. The cooling coil is a special-shaped coil group structure.
The fins are of a header type fin structure, so that the heat transfer area is increased conveniently. The header fin structure is conventional. The fins are made of 08# steel with high heat conductivity and are embedded on a light pipe made of 10# steel. Because the heat transfer coefficient of the air side is very small, radial fins are additionally arranged on the light pipe to increase the heat transfer area and the fluid turbulence and reduce the thermal resistance. The height of the fins is 12.5m, and the outer diameter of the light tube in the air cooler is 25 mm.
The air cooler is also internally provided with a spray water cooling structure, and the water cooling and air cooling modes are combined together, so that the heat dissipation and cooling are faster.
A spray water cooling structure is also arranged in the air cooler; the spray water cooling structure is provided with a sprayer, a liquid header pipe, a branch pipe, a circulating pump and a water receiving tank, wherein the branch pipe is connected with the sprayer, the sprayer is connected to the surface of the liquid header pipe through the branch pipe, and the sprayer and the branch pipe are communicated with the liquid header pipe; the circulating pump is connected with one end of the liquid header pipe, and the water receiving tank is used for storing and receiving water; the circulating pump and the water receiving tank are positioned below a louver at the bottom of the air cooler, and the sprayer is positioned at the upper part of the cooling coil; the sprayed water is sent to the liquid header pipe from the water receiving tank through the circulating pump, is uniformly sprayed to the upper part of the cooling coil pipe through the sprayer after being distributed by the branch pipes so as to increase the heat exchange effect, and the sprayed water is collected by the water receiving tank; the water cooling and air cooling modes are combined together, so that the heat dissipation and cooling are faster, and the heat dissipation effect is improved.
The water receiving tank is provided with a tank body side surface and a bottom plate, 2 water replenishing ports, a sewage draining port and an overflow port, the water receiving tank is hollow, the water replenishing ports and the overflow port are arranged at the upper part of the tank body side surface, and each water replenishing port is automatically adjusted by a ball float valve; the bottom plate of the water receiving tank is inclined, and the drain outlet is arranged at the lowest point of the bottom plate of the water tank. The water replenishing pipe and the overflow port can be arranged on one side of the side surface of the box body, can also be arranged on different sides, and can also be equal in height from the bottom surface.
The cooling coil is a special-shaped coil group structure. And an advanced and reasonable water distribution system is adopted to distribute water uniformly, so that cooling water is contacted with the cooling coil to the maximum extent. The cooling coil is subjected to hot dip galvanizing treatment at the temperature of 475 ℃, so that the corrosion resistance is improved, the possibility of scaling is reduced, and the heat transfer coefficient inside and outside the pipe is improved. The fan is an axial-flow fan, and the fan motor is a variable frequency motor.
The shutter is also provided with a protective net which is positioned at one side of the shutter in parallel. The fan motor of air cooler adopts inverter motor, and the air cooler is equipped with the shutter, is equipped with the protection network again on the shutter.
The method for condensing the crude chloroethylene comprises a compression step, an after-machine cooling step, a first-stage full condensation step, a second-stage full condensation step and a tail cooling step, wherein condensation in the first-stage full condensation step is in an air cooling mode. The total condenser adopted in the air cooling mode is an air cooler. The pressure of the crude vinyl chloride gas before entering the condensation step is 0.64 or 0.65MPaG and the temperature is 60 or 65 ℃, and in the optimized scheme, the pressure is 0.645MPaG and the temperature is 60 ℃.
The refined chloroethylene gas is condensed by a chloroethylene compressor, an after-machine cooler, a crude chloroethylene drying system and an air cooler in sequence, the uncondensed gas enters a two-stage full condenser and a tail gas cooler for further condensation, and the uncondensed gas enters a tail gas adsorption system for adsorption; and the condensate in the air cooler, the two-stage complete condenser and the tail cooler enters a chloroethylene storage tank and is sent to a liquid-phase chloroethylene rectification system by a pump for purification.
The crude chloroethylene gas generated by the reaction is washed, compressed and dried and then is sent into an air cooler, the air and the crude chloroethylene gas are utilized to indirectly contact for heat exchange, the crude chloroethylene gas is cooled to 40 ℃ from 60 ℃, most of the crude chloroethylene gas is condensed, the uncondensed gas is sent to a two-stage full condenser and a tail gas cooler for further condensation, and the condensed liquid phase chloroethylene is sent to a chloroethylene storage tank for water diversion and then is sent to a rectifying tower for purification.
The air cooler fan motor adopts a variable frequency motor, and simultaneously, the motor operation signal is considered to be sent into the DCS, so that the real-time detection and control of the fan operation condition are facilitated. The air cooler shutter is provided with a protective net which prevents the filter screen and the nozzle from being blocked by flying insects, leaves and other sundries.
The total condenser in the air cooling mode is an air cooler with a collecting pipe type fin structure, and a light pipe with the outer diameter of 25mm and a fin with the height of 12.5mm are adopted. The fin is provided with a sprayer, the air cooler is provided with a cooling coil which is of a special-shaped coil group structure, and the cooling coil is subjected to hot dip galvanizing treatment at 475 ℃.
The medium cooled by the air cooler reaches the temperature required by condensation, most of the crude chloroethylene gas is condensed, and cold air replaces circulating water to be used as a cooling medium, so that a large amount of circulating water can be saved.
The foregoing is merely illustrative of the principles of the invention and various changes and modifications can be made therein without departing from the spirit and scope of the invention, which shall fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. An apparatus for condensing crude vinyl chloride, comprising: the device comprises a chloroethylene compressor, a post-machine cooler, a crude chloroethylene drying system, a first-stage total condenser, a second-stage total condenser, a tail gas cooler, a tail gas adsorption system, a chloroethylene storage tank and a liquid-phase chloroethylene rectification system, wherein the chloroethylene compressor is connected with the crude chloroethylene drying system through the post-machine cooler; the other end of the tail cooler is connected with a tail gas adsorption system, and one end of the tail cooler is connected to a pipeline between the two-stage total condenser and the vinyl chloride storage tank; the chloroethylene storage tank is connected with the liquid-phase chloroethylene rectification system through a pump; wherein, the first-stage complete condenser is an air cooler.
2. An apparatus for condensing crude vinyl chloride as claimed in claim 1, wherein: the air cooler is sequentially provided with a fan motor, a fan, a cooling coil and a shutter from top to bottom, and the fan motor is connected with the fan; the cooling coil comprises a light pipe and fins, the fins are arranged on the outer surface of the light pipe, hot vinyl chloride gas flows in the light pipe, and air brought by the fan blows outside the light pipe to increase heat dissipation; the cooling coil is connected with a chloroethylene medium inlet main pipe orifice, a chloroethylene medium outlet gas phase main pipe orifice and a chloroethylene medium outlet liquid phase main pipe orifice, one end of the chloroethylene medium inlet main pipe orifice is connected with the crude chloroethylene drying system, and the other end of the chloroethylene medium inlet main pipe orifice is connected with the cooling coil; one end of a chloroethylene medium outlet gas-phase main pipe orifice and one end of a chloroethylene medium outlet liquid-phase main pipe orifice are vertically arranged, the other end of the chloroethylene medium outlet gas-phase main pipe orifice is connected with the two sections of full condensers, and the other end of the chloroethylene medium outlet liquid-phase main pipe orifice is connected with a chloroethylene storage tank; the outlet end of the cooling coil is connected with a gas-phase main pipe orifice of a chloroethylene medium outlet and a liquid-phase main pipe orifice of a chloroethylene medium outlet.
3. An apparatus for condensing crude vinyl chloride as claimed in claim 2, wherein: the fins are of a header type fin structure, so that the heat transfer area is increased conveniently.
4. An apparatus for condensing crude vinyl chloride as claimed in claim 2, wherein: the height of the fins is 12-13m.
5. An apparatus for condensing crude vinyl chloride as claimed in claim 4, wherein: the height of the fins is 12.5 mm.
6. An apparatus for condensing crude vinyl chloride as claimed in claim 1 or 2, wherein: the outer diameter of a light pipe in the air cooler is 20-30 mm.
7. An apparatus for condensing crude vinyl chloride as claimed in claim 6, wherein: and the outer diameter of a light pipe in the air cooler is 25 mm.
8. An apparatus for condensing crude vinyl chloride as claimed in claim 1 or 2, wherein: a spray water cooling structure is also arranged in the air cooler; the spray water cooling structure is provided with a sprayer, a liquid header pipe, a branch pipe, a circulating pump and a water receiving tank, wherein the branch pipe is connected with the sprayer, the sprayer is connected to the surface of the liquid header pipe through the branch pipe, and the sprayer and the branch pipe are communicated with the liquid header pipe; the circulating pump is connected with one end of the liquid header pipe, and the water receiving tank is used for storing and receiving water; the circulating pump and the water receiving tank are positioned below a louver at the bottom of the air cooler, and the sprayer is positioned at the upper part of the cooling coil; the spray water is sent to the liquid header pipe from the water receiving tank through the circulating pump, and is evenly sprayed to the upper part of the cooling coil pipe through the sprayer after being distributed by the branch pipes so as to increase the heat exchange effect, and the sprayed water is collected by the water receiving tank.
9. An apparatus for condensing crude vinyl chloride as claimed in claim 2, wherein: the shutter is also provided with a protective net which is positioned at one side of the shutter in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020796874.3U CN212747066U (en) | 2020-05-13 | 2020-05-13 | Thick chloroethylene device of condensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020796874.3U CN212747066U (en) | 2020-05-13 | 2020-05-13 | Thick chloroethylene device of condensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212747066U true CN212747066U (en) | 2021-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020796874.3U Active CN212747066U (en) | 2020-05-13 | 2020-05-13 | Thick chloroethylene device of condensation |
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| Country | Link |
|---|---|
| CN (1) | CN212747066U (en) |
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2020
- 2020-05-13 CN CN202020796874.3U patent/CN212747066U/en active Active
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