CN219559573U - Hot water recycling system for vinyl chloride synthesis reaction - Google Patents
Hot water recycling system for vinyl chloride synthesis reaction Download PDFInfo
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- CN219559573U CN219559573U CN202320643929.0U CN202320643929U CN219559573U CN 219559573 U CN219559573 U CN 219559573U CN 202320643929 U CN202320643929 U CN 202320643929U CN 219559573 U CN219559573 U CN 219559573U
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Abstract
The utility model belongs to the field of low-temperature waste heat recovery of chemical production lines, and provides a hot water recycling system for vinyl chloride synthesis reaction, which comprises the following components: the device comprises an acetylene cooler (1), an acetylene demister (2), a hydrogen chloride cooler (3), a hydrogen chloride demister (4), a mixer (5), a sub-cooling cooler (6), an acid mist filter (7), a preheater (8), a front converter (9), a rear converter (10), a hot water tower (11) and a lithium bromide refrigerating unit (12); the energy of the synthetic reaction hot water is reasonably utilized, so that the virtuous circle of a hot water system is realized, and the energy consumption is reduced.
Description
Technical Field
The utility model belongs to the field of low-temperature waste heat recovery of chemical production lines, and particularly relates to a waste heat recovery and utilization system for vinyl chloride synthesis reaction.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The chloroethylene synthesis reaction is an exothermic reaction, reaction heat is taken away by circulating hot water, the heat is taken away by forced circulation hot water in the traditional process, the circulating hot water is cooled by a cooler and is subjected to air heat dissipation, and the converted heat is removed, so that not only is the power consumption increased, but also the heat is lost. Most PVC manufacturing enterprises do not reasonably and effectively utilize the heat, and energy waste is caused.
The inventors found that: in the prior art, the temperature of circulating hot water is always maintained at about 100 ℃, so that the steam volatilization amount in the hot water tower is large, a large amount of steam is emptied, soft water is needed to be replenished, the soft water resource waste is caused, and the cost is increased; at the same time, the exhausted steam causes a great deal of heat loss. On the other hand, the temperature in the hot water tower is maintained at about 100 ℃, and hot water is extremely easy to vaporize at the temperature to cause cavitation of a hot water pump, damage equipment and further influence hot water circulation.
Therefore, there is an urgent need for a hot water recycling system for vinyl chloride synthesis reaction.
Disclosure of Invention
In order to solve the problems, the utility model provides a chloroethylene synthesis reaction hot water recycling system which reasonably utilizes the energy of synthesis reaction hot water, realizes virtuous circle of a hot water system and reduces energy consumption.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
in a first aspect of the present utility model, there is provided a hot water recycling system for vinyl chloride synthesis reaction, comprising:
acetylene cooler, acetylene demister, hydrogen chloride cooler, hydrogen chloride demister, mixer, sub-cooler, acid mist filter, preheater, front converter, rear converter, hot water tower, lithium bromide refrigerating unit;
the device comprises an acetylene cooler, an acetylene demister, a mixer, a cryogenic cooler, an acid mist filter, a preheater, a front converter and a rear converter, wherein the acetylene cooler, the acetylene demister, the mixer, the cryogenic cooler, the acid mist filter, the preheater, the front converter and the rear converter are sequentially connected, the hydrogen chloride cooler, the hydrogen chloride demister and the mixer are sequentially connected, a circulating water outlet of the front converter and a circulating water outlet of the rear converter are connected with a water inlet of a lithium bromide refrigerating unit, and a water outlet of the lithium bromide refrigerating unit is respectively connected with water inlets at the top and the bottom of a hot water tower.
In a second aspect of the present utility model, there is provided a process for recycling hot water in a vinyl chloride synthesis reaction, comprising:
acetylene and hydrogen chloride react to synthesize chloroethylene, and the reaction heat is absorbed by adopting circulating hot water;
the circulating hot water firstly enters 7 ℃ cold water generated by a lithium bromide refrigerating unit and then enters a hot water tower;
hot water discharged by the hot water tower is pumped to the preheater and the converter in sequence through the hot water pump for recycling;
cooling the acetylene and hydrogen chloride before the reaction by the 7 ℃ cold water, or supplying the acetylene and hydrogen chloride to other users.
The beneficial effects of the utility model are that
(1) The circulating hot water is used for preparing 7 ℃ cold water by a lithium bromide refrigerating unit, and the reaction heat is reasonably utilized. Meanwhile, the temperature in the hot water tower is reduced, and cavitation of the hot water pump is avoided.
(2) The generated 7 ℃ cold water is used for cooling the hydrogen chloride and the acetylene gas, so that the water content in the acetylene gas is reduced, the generation of condensed acid is reduced, and the subsequent treatment cost of the condensed acid is saved.
(3) The circulation loop of the cold water system is provided with the overhead tank, so that the operation cost of the pump is effectively reduced, and the energy is saved and the consumption is reduced. The elevated tank is used for eliminating the heat expansion influence of the cold water system and replenishing soft water.
(4) The utility model adds a lithium bromide refrigerating unit (belonging to the waste heat refrigerating technology) on the basis of the heat exchange technology, organically combines the two technologies through the design of a proper pipeline and a pump, fully utilizes the heat of the synthesis reaction of the chloroethylene, simultaneously supplies the generated cold water for the system of the utility model, and effectively reduces the running energy consumption.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic view showing the structure of a device according to comparative example 1 of the present utility model;
FIG. 2 is a schematic view of the device structure of embodiment 1 of the present utility model;
the system comprises an acetylene cooler 1, an acetylene mist eliminator 2, a hydrogen chloride cooler 3, a hydrogen chloride mist eliminator 4, a mixer 5, a cryocooler 6, an acid mist filter 7, a preheater 8, a front converter 9, a rear converter 10, a hot water tower 11, a lithium bromide refrigerating unit 12, a hot water pump 13, a condensing acid tank 14, a condensing acid pump 15, a cold water pump 16, a head tank 17 and other users 18.
Fluid: a: acetylene, B: hydrogen chloride, C: condensate, D: -35 ℃ brine, E: hydrochloric acid, F: circulating cooling water backwater, G: circulating cooling water supply and H: crude vinyl chloride gas, I: cold water at 7 ℃.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
As described in the background art, the main technologies of waste heat recovery currently include heat exchange technology, heat-power conversion technology and waste heat refrigeration and heating technology.
1. The heat exchange technology is economical and simple, and the waste heat is directly transmitted to a downstream flow through heat exchange equipment, so that the consumption of primary energy is reduced, and the waste heat is preferably utilized by the equipment or the system. The preheater in the prior art and the utility model uses the technology, but the heat release amount of the vinyl chloride synthesis reaction is large, and the waste heat can not be fully utilized by the system, and a large amount of waste heat still exists. If the waste heat is used by other systems except the system, pumps, related pipelines and the like are required to be added, equipment investment is high, and other heat consuming users have limited heat at the temperature (about 100 ℃), so that the temperature heat source cannot be fully utilized in actual operation.
2. The medium-high temperature waste heat utilized by the heat power conversion technology is about 100 ℃ hot water temperature in the system, belongs to low-temperature waste heat, and cannot be recovered by adopting the technology.
3. Waste heat refrigerating and heating technologies are divided into waste heat refrigerating technologies and heat pump technologies. Compared with the traditional compression type refrigerating unit, the waste heat refrigerating technology has the advantages that the absorption type refrigerating system can utilize low-cost energy and low-grade heat energy to avoid electricity consumption, and the defect of insufficient power supply is overcome. An absorption refrigerating system using lithium bromide aqueous solution as working medium can generally use low-temperature heat source in 80-250 deg.C, but can only prepare refrigerant temperature above 0 deg.C or 5 deg.C because water is used as refrigerant. Heat pump technology is commonly used to recover waste heat (30-60 ℃) resources slightly above ambient temperature. The heat pump uses a part of high-temperature energy (electric energy, mechanical energy or high-temperature heat energy) as compensation, and pumps the heat of the low-temperature residual heat source to the high-temperature heat medium through the thermodynamic cycle of the refrigerator.
In summary, the prior preheater (belonging to the heat exchange technology) recycles part of the waste heat of the vinyl chloride synthesis reaction, but most of the waste heat is still not fully utilized, so that the waste of heat resources is caused. The utility model designs the hot water recycling system for vinyl chloride synthesis reaction based on the combination effect of different heat exchange modes and the design modes of different pumps and pipelines, and adds a lithium bromide refrigerating unit (belonging to the waste heat refrigerating technology) based on the heat exchange technology, and the two technologies are organically combined through the design of the proper pipelines and pumps, so that the heat of vinyl chloride synthesis reaction is fully utilized, and meanwhile, the generated cold water is supplied to the system of the utility model, so that the running energy consumption is effectively reduced.
According to the utility model, common equipment in the chemical industry can be adopted by an acetylene cooler, an acetylene demister, a hydrogen chloride cooler, a hydrogen chloride demister, a mixer, a cryogenic cooler, an acid mist filter, a preheater, a front converter, a rear converter, a hot water tower, a lithium bromide refrigerating unit, a hot water pump, a condensed acid tank, a condensed acid pump, a cold water pump and a high-level tank, and a common person can select the model and specification of the equipment according to the needs of specific working conditions.
The connection between the devices can also be made by a common connection mode in the field of chemical treatment, for example: the connection is realized after the connection parts such as pipelines, valves, joints and the like are singly or combined, and meanwhile, power conveying equipment such as a water pump and the like is arranged based on the position, distance and height conditions of each device so as to realize the conveying of materials, water bodies and steam among the equipment.
The utility model will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Comparative example 1
After entering the hydrogen chloride cooler 3 to exchange heat with 7 ℃ cold water, part of water in the hydrogen chloride gas is condensed and is separated out in the form of hydrochloric acid. The hydrogen chloride gas passes through the hydrogen chloride demister 4, is mixed with the refined acetylene gas according to a certain proportion, then enters the mixer 5, is fully mixed, enters the cryogenic cooler 6 to exchange heat with brine at the temperature of minus 35 ℃, and simultaneously utilizes the property of strong water absorption of the hydrogen chloride to fully remove water in the mixed gas, and then enters the acid mist filter 7 to remove acid mist, so that the dried mixed gas is sent to the preheater 8. Hydrochloric acid separated by the hydrogen chloride cooler 3, the hydrogen chloride demister 4, the cryocooler 6, the acid mist filter 7 and the like is gathered to an acid discharging main pipe from the bottom and enters a condensed acid tank 14. The dry mixed gas from the acid mist filter 7 enters a preheater 8 to be subjected to indirect heat exchange with hot water sent by a hot water pump 13, and then sequentially enters a front converter 9 and a rear converter 10, and hydrogen chloride and acetylene react under the action of a catalyst to generate crude chloroethylene gas. The reaction heat generated by the synthesis reaction is indirectly exchanged in the converter by hot water pumped by the hot water pump 13 and returned to the hot water tower 11.
Example 1
A hot water recycling system for vinyl chloride synthesis reaction comprises:
acetylene cooler 1, acetylene mist eliminator 2, hydrogen chloride cooler 3, hydrogen chloride mist eliminator 4, mixer 5, cryogenic cooler 6, acid mist filter 7, preheater 8, front converter 9, rear converter 10, hot water tower 11, lithium bromide refrigeration unit 12;
the device comprises an acetylene cooler 1, an acetylene demister 2, a mixer 5, a cryogenic cooler 6, an acid mist filter 7, a preheater 8, a front converter 9 and a rear converter 10, wherein the hydrogen chloride cooler 3, the hydrogen chloride demister 4 and the mixer 5 are sequentially connected, a circulating water outlet of the front converter 9 and the rear converter 10 is connected with a water inlet of a lithium bromide refrigerating unit 12, and a water outlet of the lithium bromide refrigerating unit 12 is respectively connected with water inlets at the top and the bottom of a hot water tower 11.
In some embodiments, the water outlet at the bottom of the hot water tower 11 is connected to a hot water pump 13, the outlet of the hot water pump 13 is connected to the water inlet of the preheater 8, and the water outlet of the preheater 8 is connected to the water inlets of the front converter 9 and the rear converter 10, respectively.
In some embodiments, the lithium bromide refrigeration unit 12 is provided with a circulating cooling water supply pipeline and a circulating cooling water supply return pipeline; the cold water outlet at 7 ℃ of the lithium bromide refrigeration unit 12 is respectively connected with the water inlets of the acetylene cooler 1 and the hydrogen chloride cooler 3.
In some embodiments, the water outlets of the acetylene coolers 1 and the hydrogen chloride cooler 3 are connected with a cold water pump 16 and a cold water inlet of the lithium bromide refrigeration unit 12.
In some embodiments, the overhead tank 17 is connected to the lithium bromide refrigeration unit 12.
In some embodiments, the outlets of the hydrogen chloride cooler 3, the hydrogen chloride demister 4, the mixer 5, the cryocooler 6 and the acid mist filter 7 are respectively connected with a condensed acid tank 14.
In some embodiments, a condensed acid pump 15 is provided on the outlet pipe of the condensed acid tank 14.
In some embodiments, the cold water pumps 16 are arranged in parallel to form a circulation loop.
In some embodiments, the hot water pumps 13 are arranged in parallel to form a circulation loop.
After entering the hydrogen chloride cooler 3 to exchange heat with 7 ℃ cold water, part of water in the hydrogen chloride gas is condensed and is separated out in the form of hydrochloric acid. And (3) after the refined acetylene gas from the acetylene section enters an acetylene cooler 1 to exchange heat with 7 ℃ cold water, condensing part of water in the acetylene gas. The hydrogen chloride gas and the acetylene gas are proportioned according to a certain proportion, then enter a mixer 5, fully mixed, enter a cryocooler 6 to exchange heat with brine at minus 35 ℃, and simultaneously enter an acid mist filter 7 to remove acid mist after fully removing water in the mixed gas by utilizing the property of strong water absorption of the hydrogen chloride, so that the dried mixed gas is sent to a preheater 8. Hydrochloric acid separated by the hydrogen chloride cooler 3, the hydrogen chloride demister 4, the cryocooler 6, the acid mist filter 7 and the like is gathered to an acid discharging main pipe from the bottom and enters a condensed acid tank 14. The dry mixed gas from the acid mist filter 7 enters a preheater 8 to be subjected to indirect heat exchange with hot water sent by a hot water pump 13, and then sequentially enters a front converter 9 and a rear converter 10, and hydrogen chloride and acetylene react under the action of a catalyst to generate crude chloroethylene gas. The hot water generated by the synthesis reaction is indirectly exchanged in the converter by the hot water pump 13, and then is sent to the lithium bromide refrigeration unit 12, and 7 ℃ cold water is prepared by the lithium bromide refrigeration unit 12 and returned to the hot water tower 11. The resulting 7 c cold water is used to cool the hydrogen chloride and acetylene gases, reducing the water content in the gases, and the excess 7 c cold water provides refrigeration to other users 18.
Example 1 was applied to a 20 ten thousand ton/year PVC plant, the temperature of the circulating hot water after passing through the converter was 99.5℃and the flow was 1800m 3 Load 5700KW of lithium bromide refrigerating unit for preparing 980m cold water flow at 7 DEG C 3 And/h. The cold water consumption of the acetylene cooler is 55m 3 And/h, the cold water consumption of the hydrogen chloride cooler is 40m 3 And/h, using most of cold water for providing cold energy for other working sections, such as a synthetic rectification working section, an electrolysis workshop and the like. The utility model saves about 15 tons/hour of steam after being implemented.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. A vinyl chloride synthesis reaction hot water recycling system is characterized by comprising:
the device comprises an acetylene cooler (1), an acetylene demister (2), a hydrogen chloride cooler (3), a hydrogen chloride demister (4), a mixer (5), a sub-cooling cooler (6), an acid mist filter (7), a preheater (8), a front converter (9), a rear converter (10), a hot water tower (11) and a lithium bromide refrigerating unit (12);
acetylene cooler (1), acetylene defroster (2), blender (5), cryocooler (6), acid mist filter (7), pre-heater (8), preceding converter (9), after-converter (10) link to each other in proper order, hydrogen chloride cooler (3), hydrogen chloride defroster (4) link to each other with blender (5) in proper order, the circulating water export of preceding converter (9), after-converter (10) links to each other with the water inlet of lithium bromide refrigeration unit (12), the delivery port of lithium bromide refrigeration unit (12) links to each other with the water inlet at the top of the tower and the bottom of the tower respectively.
2. The chloroethylene synthesis reaction hot water recycling system according to claim 1, wherein a water outlet at the bottom of the hot water tower (11) is connected with a hot water pump (13), an outlet of the hot water pump (13) is connected with a water inlet of a preheater (8), and a water outlet of the preheater (8) is respectively connected with water inlets of a front converter (9) and a rear converter (10).
3. The chloroethylene synthesis reaction hot water recycling system according to claim 1, wherein the lithium bromide refrigeration unit (12) is provided with a circulating cooling water supply pipeline and a circulating cooling water supply return pipeline; the cold water outlet at 7 ℃ of the lithium bromide refrigerating unit (12) is respectively connected with the water inlets of the acetylene cooler (1) and the hydrogen chloride cooler (3).
4. The chloroethylene synthesis reaction hot water recycling system according to claim 1, wherein the water outlets of the acetylene cooler (1) and the hydrogen chloride cooler (3) are connected with a cold water pump (16) and a cold water inlet of a lithium bromide refrigerating unit (12).
5. The hot water recycling system for vinyl chloride synthesis reaction according to claim 1, wherein the lithium bromide refrigeration unit (12) is connected with a high-level tank (17).
6. The hot water recycling system for vinyl chloride synthesis reaction according to claim 1, wherein the liquid outlets of the hydrogen chloride cooler (3), the hydrogen chloride demister (4), the mixer (5), the cryogenic cooler (6) and the acid mist filter (7) are respectively connected with the condensed acid tank (14).
7. The hot water recycling system for vinyl chloride synthesis reaction according to claim 6, wherein a condensed acid pump (15) is provided on an outlet pipe of the condensed acid tank (14).
8. The hot water recycling system for vinyl chloride synthesis reaction according to claim 4, wherein the cold water pump (16) is arranged in parallel to form a circulation loop.
9. The hot water recycling system for vinyl chloride synthesis reaction according to claim 2, wherein the hot water pump (13) is arranged in parallel to form a circulation loop.
10. The chloroethylene synthesis reaction hot water recycling system according to claim 1, wherein the load of the lithium bromide refrigeration unit (12) is 5700KW.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320643929.0U CN219559573U (en) | 2023-03-24 | 2023-03-24 | Hot water recycling system for vinyl chloride synthesis reaction |
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| CN202320643929.0U CN219559573U (en) | 2023-03-24 | 2023-03-24 | Hot water recycling system for vinyl chloride synthesis reaction |
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