CN116147219A - Energy-saving system and method in ABS production system - Google Patents
Energy-saving system and method in ABS production system Download PDFInfo
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- CN116147219A CN116147219A CN202211463718.5A CN202211463718A CN116147219A CN 116147219 A CN116147219 A CN 116147219A CN 202211463718 A CN202211463718 A CN 202211463718A CN 116147219 A CN116147219 A CN 116147219A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 47
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 358
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 217
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 169
- 238000005057 refrigeration Methods 0.000 claims abstract description 88
- 238000010521 absorption reaction Methods 0.000 claims abstract description 72
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 239000000839 emulsion Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 230000002745 absorbent Effects 0.000 claims description 54
- 239000002250 absorbent Substances 0.000 claims description 54
- 239000007788 liquid Substances 0.000 claims description 54
- 239000006096 absorbing agent Substances 0.000 claims description 36
- 230000008569 process Effects 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 238000007710 freezing Methods 0.000 abstract description 9
- 230000008014 freezing Effects 0.000 abstract description 9
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 239000002918 waste heat Substances 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/04—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being ammonia evaporated from aqueous solution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
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- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses an energy-saving system and method in an ABS production system, and solves the technical problem of high energy consumption in the ABS production system by an emulsion grafting-bulk SAN blending method and a continuous bulk method in the prior art. The energy-saving system comprises a heat conduction oil furnace, a hot water tank, a condenser, a freezing water tank, an ammonia absorption refrigerating device and a heat exchange mechanism. The invention takes hot water as a carrier, utilizes the waste heat of flue gas of a heat conduction oil furnace to heat the hot water at 95 ℃ to 115 ℃ and send the hot water to the ammonia absorption refrigeration device, and uses the hot water as a heat source to drive a refrigeration medium in the ammonia absorption refrigeration device to work, so that the temperature of frozen backwater is reduced from 0 ℃ to-5 ℃ for users to use, and the frozen backwater can be reduced to-5 ℃ for users to use without using an electrically-driven compression refrigeration unit, thereby reducing the power consumption and realizing the cost reduction and the efficiency enhancement of ABS production.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to an energy-saving system and method in an ABS production system.
Background
The SAN device of the emulsion grafting-bulk SAN blending method and the devolatilization process of the ABS of the continuous bulk method need to use heat conduction oil with the temperature of 280 ℃, a heat conduction oil furnace is generally configured, and the temperature of flue gas in the heat conduction oil furnace can reach 280 ℃; chilled water, typically at-5 ℃, is used in the condenser during the devolatilization step.
In the existing ABS production process, the situation of unreasonable energy utilization exists. On one hand, the flue gas with the temperature of 280 ℃ in a heat conduction oil furnace for supplying heat conduction oil for the SAN device of the emulsion grafting-bulk SAN blending method and the devolatilization process of the continuous bulk ABS is discharged to the air without fully utilizing the heat, so that energy loss is caused. On the other hand, chilled water (ethylene glycol aqueous solution) at-5 ℃ used in the continuous bulk ABS devolatilization process is prepared by an electrically driven compression refrigerating unit, and the unit power consumption is high.
Therefore, designing an energy-saving system and method in an ABS production system to make energy utilization more scientific and energy-saving in the ABS production process becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problems that: an energy saving system and method for ABS production system is provided to solve at least some of the above technical problems.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the energy-saving system in the ABS production system comprises a heat conduction oil furnace for providing heat conduction oil for the ABS production system, a condenser in a devolatilization process of the ABS production system, a chilled water tank for providing chilled water for the condenser, an ammonia absorption refrigeration device connected between the chilled water tank and the condenser and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace into the refrigeration power of the ammonia absorption refrigeration device.
Further, the ammonia absorption refrigeration device comprises a generator connected with the heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator connected between the freezing water tank and the condenser, an absorber connected to the generator and internally storing ammonia-lean liquid absorbent, and an ammonia condenser connected to the evaporator.
Further, the pipeline between the ammonia condenser and the evaporator is connected, and a first throttle valve is arranged on the pipeline.
Further, the absorber is connected with the generator through a pipeline, and a booster pump is arranged on the pipeline.
Further, a lean ammonia liquid absorbent return pipe is connected between the generator and the absorber, and a second throttle valve is arranged on the lean ammonia liquid absorbent return pipe.
Further, the evaporator is a shell-and-tube evaporator, the shell side of the evaporator is respectively connected with the ammonia condenser and the absorber, a chilled water conveying pipe is connected between the chilled water tank and the condenser, and the tube side of the evaporator is communicated with the chilled water conveying pipe.
Further, a chilled water circulating pump is arranged on the chilled water conveying pipe.
Further, a chilled water return pipe is connected between the chilled water tank and the condenser.
Further, the heat exchange mechanism comprises a first heat exchange tube in a flue gas channel in the heat conduction oil furnace, a second heat exchange tube which is connected out of the first heat exchange tube and in the generator, and a hot water tank which is connected out of the second heat exchange tube and is connected to the first heat exchange tube; the hot water tank is connected with the first heat exchange pipe through a pipeline, and a hot water circulating pump is arranged on the pipeline.
The heat exchange mechanism is used to replace the heat of high temperature fume in heat conducting oil furnace into the generator in ammonia absorbing and refrigerating unit as heat source, and the high pressure ammonia-rich liquid absorbent in the generator absorbs heat to gasify into high pressure ammonia, which is condensed into high pressure liquid ammonia, throttled, evaporated into low pressure ammonia and recovered into the generator, and the pipeline for cooling water in the condenser is lowered to-5 deg.c from 0 deg.c to provide-5 deg.c chilled water in the condenser.
Compared with the prior art, the invention has the following beneficial effects:
the invention has simple structure, scientific and reasonable design and convenient use, takes hot water as a carrier, utilizes the waste heat of flue gas of the heat conduction oil furnace to heat the hot water at 95 ℃ to 115 ℃ and send the hot water to the ammonia absorption refrigeration device, and is used as a heat source to drive the refrigeration medium in the ammonia absorption refrigeration device to work, so that the temperature of frozen backwater is reduced from 0 ℃ to-5 ℃ for users to use, and the invention can reduce the frozen water at 0 ℃ to the frozen water at-5 ℃ for users to use without using an electrically driven compression refrigeration unit, thereby reducing the power consumption and realizing the cost reduction and efficiency enhancement of ABS production.
For an ABS factory with an emulsion grafting-bulk SAN blending method of 20 ten thousand tons/year, an SAN device adopts a refrigerating unit with electric drive compression capacity of 1000kW, the electric power consumption of the refrigerating unit is 360kW, the electric power consumption of a pump of the technical machine is 60kW, and the annual energy is 2,400,000kWh. The industrial electricity price is calculated by 0.6 yuan/kWh, and the annual energy saving cost is 144 ten thousand yuan. Therefore, the invention has higher popularization value.
Drawings
FIG. 1 is a schematic diagram of an energy saving system in an ABS production system of the present invention.
Wherein, the names corresponding to the reference numerals are:
1-a heat conduction oil furnace; 2-a hot water circulation pump; 3-a hot water tank; a 4-absorber; 5-a booster pump; a 6-generator; 7-an ammonia condenser; 8-an evaporator; 9-a chilled water circulation pump; 10-a frozen water tank; 11-a condenser; 12-a first throttle valve; 13-lean ammonia liquid absorbent return line; 14-a second throttle valve; 15-chilled water delivery pipe; 16-chilled water return line; 17-a first heat exchange tube; 18-a second heat exchange tube; 19-ammonia absorption refrigeration device; 20-a conduction oil furnace system; 21-a conduction oil supply pipe; 22-a conduction oil return pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In embodiment 1, as shown in fig. 1, the energy-saving system in an ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device 19 connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device.
The invention has simple structure, scientific and reasonable design and convenient use, takes hot water as a carrier, utilizes the waste heat of flue gas of the heat conduction oil furnace to heat the hot water at 95 ℃ to 115 ℃ and send the hot water to the ammonia absorption refrigeration device, and is used as a heat source to drive the refrigeration medium in the ammonia absorption refrigeration device to work, so that the temperature of frozen backwater is reduced from 0 ℃ to-5 ℃ for users to use, and the invention can reduce the frozen water at 0 ℃ to the frozen water at-5 ℃ for users to use without using an electrically driven compression refrigeration unit, thereby reducing the power consumption and realizing the cost reduction and efficiency enhancement of ABS production.
In embodiment 2, as shown in fig. 1, the energy-saving system in the ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6.
This embodiment 2 gives a more preferable structure of the ammonia absorption refrigeration device based on embodiment 1, specifically: the ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6. Through the structure, the high-pressure ammonia-rich liquid absorbent evaporates high-temperature high-pressure ammonia through the heat source provided by the heat exchange mechanism, the high-temperature high-pressure ammonia is condensed into high-pressure liquid ammonia through the ammonia condenser 7, the high-pressure liquid ammonia throttles into low-temperature low-pressure liquid ammonia, then enters the evaporator 8 to absorb heat and evaporate into low-pressure ammonia, the low-pressure ammonia enters the absorber 4 to be absorbed by the ammonia-poor liquid absorbent, the ammonia-poor liquid absorbent absorbs the low-pressure ammonia to become the ammonia-rich liquid absorbent, then the ammonia-rich liquid absorbent is conveyed into the generator 6 to form a cycle, and when the low-temperature low-pressure liquid ammonia absorbs heat and evaporates into low-pressure ammonia in the evaporator 8, the chilled water provided for the condenser 11 can be reduced from 0 ℃ to minus 5 ℃. Therefore, the power consumption can be effectively reduced, and the cost reduction and efficiency improvement of ABS production are realized.
In embodiment 3, as shown in fig. 1, the energy-saving system in the ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6. The air ammonia condenser 7 is connected with the evaporator 8 through a pipeline, and a first throttle valve 12 is arranged on the pipeline.
This example 3 gives a more preferable connection structure between the ammonia condenser 7 and the evaporator 8 based on example 2, specifically: the air ammonia condenser 7 is connected with the evaporator 8 through a pipeline, and a first throttle valve 12 is arranged on the pipeline. By the above structure, the high-pressure liquid ammonia from the ammonia condenser 7 is throttled to low-temperature low-pressure liquid ammonia at the first throttle valve 12, so that the heat absorption and evaporation efficiency of the evaporator 8 can be effectively improved.
Embodiment 4 as shown in fig. 1, the energy-saving system in an ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6. The absorber 4 is connected with the generator 6 through a pipeline, and a booster pump 5 is arranged on the pipeline.
This embodiment 4 gives a more preferred connection structure between the absorber 4 and the generator 6 on the basis of embodiment 2, specifically: the absorber 4 is connected with the generator 6 through a pipeline, and a booster pump 5 is arranged on the pipeline. With the above structure, the liquid absorbent having absorbed a sufficient amount of ammonia gas becomes a high-pressure ammonia-rich liquid absorbent by the booster pump 5, and is pumped into the generator 6. The stable and continuous operation of the system can be effectively ensured.
In embodiment 5, as shown in fig. 1, the energy-saving system in the ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6. A lean ammonia liquid absorbent return pipe 13 is connected between the generator 6 and the absorber 4, and a second throttle valve 14 is arranged on the lean ammonia liquid absorbent return pipe 13.
This embodiment 5 gives a more preferred connection structure between the absorber 4 and the generator 6 on the basis of embodiment 2, in particular: a lean ammonia liquid absorbent return pipe 13 is connected between the generator 6 and the absorber 4, and a second throttle valve 14 is arranged on the lean ammonia liquid absorbent return pipe 13. Through the structure, the high-pressure ammonia-rich liquid absorbent in the generator 6 evaporates to obtain high-temperature high-pressure ammonia through the pipeline after the heat exchange mechanism provides a heat source to enter the ammonia condenser 7, and the high-pressure ammonia-lean liquid absorbent retained in the generator 6 circularly flows into the absorber 4 through the ammonia-lean liquid absorbent return pipe 13 to form a circulation. The second throttle valve 14 is effective to throttle the high-pressure lean ammonia liquid absorbent to a low-pressure lean ammonia liquid absorbent, facilitating the absorption of low-pressure ammonia gas by the absorber 4 from the evaporator 8.
In embodiment 6, as shown in fig. 1, the energy-saving system in the ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6. The evaporator 8 is a shell-and-tube evaporator, the shell side of the evaporator 8 is respectively connected with the ammonia condenser 7 and the absorber 4, a chilled water conveying pipe 15 is connected between the chilled water tank 10 and the condenser 11, and the tube side of the evaporator 8 is communicated with the chilled water conveying pipe 15.
This example 6 gives, on the basis of example 2, a more preferable connection structure among the evaporator 8, the ammonia condenser 7, the absorber 4, the chilled water tank 10 and the condenser 11, specifically: the evaporator 8 is a shell-and-tube evaporator, the shell side of the evaporator 8 is respectively connected with the ammonia condenser 7 and the absorber 4, a chilled water conveying pipe 15 is connected between the chilled water tank 10 and the condenser 11, and the tube side of the evaporator 8 is communicated with the chilled water conveying pipe 15. So designed, the high-temperature high-pressure ammonia is changed into high-pressure liquid ammonia after being cooled by the ammonia condenser 7, the high-pressure liquid ammonia is changed into low-pressure liquid ammonia under the action of a throttle valve to enter the shell pass of the evaporator 8, the low-pressure liquid ammonia in the shell pass of the evaporator 8 is evaporated into low-pressure ammonia, the process is endothermic conversion, and the low-pressure ammonia enters the absorber 4 through a pipeline in the shell pass of the evaporator 8 and is not absorbed by the lean ammonia liquid absorbent in the absorber 4. The chilled water at 0 ℃ in the chilled water tank 10 is conveyed to a condenser 11 or other users needing chilled water in the devolatilization process of the ABS production system through a chilled water conveying pipe 15, the chilled water conveying pipe 15 is connected with the tube side of the evaporator 8 in series, and in the process, low-pressure liquid ammonia is evaporated into low-pressure ammonia to provide heat, so that the chilled water at 0 ℃ in the tube side of the evaporator 8 is changed into chilled water at-5 ℃, and the purpose of providing chilled water at-5 ℃ for the condenser 11 or other users needing chilled water at-5 ℃ in the devolatilization process of the ABS production system by adopting the chilled water at 0 ℃ in the chilled water tank 10 is realized.
The invention takes hot water as a carrier, utilizes the waste heat of flue gas of a heat conduction oil furnace to heat the hot water at 95 ℃ to 115 ℃ and send the hot water to the ammonia absorption refrigeration device, and uses the hot water as a heat source to drive a refrigeration medium in the ammonia absorption refrigeration device to work, so that the temperature of frozen backwater is reduced from 0 ℃ to-5 ℃ for users to use, and the frozen backwater can be reduced to-5 ℃ for users to use without using an electrically-driven compression refrigeration unit, thereby reducing the power consumption and realizing the cost reduction and the efficiency enhancement of ABS production.
Embodiment 7 as shown in fig. 1, the energy saving system in an ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The ammonia absorption refrigeration device comprises a generator 6 connected with a heat exchange mechanism and internally storing high-pressure ammonia-rich liquid absorbent, an evaporator 8 connected between a freezing water tank 10 and a condenser 11, an absorber 4 connected to the generator 6 and internally storing lean ammonia liquid absorbent from the evaporator 8, and a gas ammonia condenser 7 connected to the evaporator 8 from the generator 6. The evaporator 8 is a shell-and-tube evaporator, the shell side of the evaporator 8 is respectively connected with the ammonia condenser 7 and the absorber 4, a chilled water conveying pipe 15 is connected between the chilled water tank 10 and the condenser 11, and the tube side of the evaporator 8 is communicated with the chilled water conveying pipe 15. The chilled water delivery pipe 15 is provided with a chilled water circulation pump 9.
This embodiment 7 gives a more preferable structure of the chilled water supply pipe 15 based on embodiment 6, specifically: the chilled water delivery pipe 15 is provided with a chilled water circulation pump 9. By the design, the chilled water tank 10 can be effectively ensured to convey chilled water to the condenser 11.
In embodiment 8, as shown in fig. 1, the energy-saving system in the ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. A chilled water return line 16 is connected between the chilled water tank 10 and the condenser 11.
This embodiment 8 gives a more preferable connection structure between the chilled water tank 10 and the condenser 11 based on embodiment 1, specifically: a chilled water return line 16 is connected between the chilled water tank 10 and the condenser 11. By the design, after the condenser 11 is used, chilled water at the temperature of minus 5 ℃ is changed into chilled water at the temperature of 0 ℃ and can flow back into the chilled water tank 10 through the chilled water return pipe 16, so that a circulation is formed, and water can be effectively saved.
In embodiment 9, as shown in fig. 1, the energy-saving system in the ABS production system provided by the invention comprises a heat conduction oil furnace 1 for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser 11 in a devolatilization process of the ABS production system, a chilled water tank 10 for providing chilled water for the condenser 11, an ammonia absorption refrigeration device connected between the chilled water tank 10 and the condenser 11 and used for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace 1 and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace 1 into the refrigeration power of the ammonia absorption refrigeration device. The heat exchange mechanism comprises a first heat exchange tube 17 arranged in a flue gas channel in the heat conduction oil furnace 1, a second heat exchange tube 18 connected out of the first heat exchange tube 17 and arranged in the generator 6, and a hot water tank 3 connected out of the second heat exchange tube 18 and connected into the first heat exchange tube 17; the hot water tank 3 is connected with the first heat exchange pipe 17 through a pipeline, and a hot water circulating pump 2 is arranged on the pipeline.
In this embodiment 9, on the basis of embodiment 1, a more preferable structure of the heat exchange mechanism is given, specifically: the heat exchange mechanism comprises a first heat exchange tube 17 arranged in a flue gas channel in the heat conduction oil furnace 1, a second heat exchange tube 18 connected out of the first heat exchange tube 17 and arranged in the generator 6, and a hot water tank 3 connected out of the second heat exchange tube 18 and connected into the first heat exchange tube 17; the hot water tank 3 is connected with the first heat exchange pipe 17 through a pipeline, and a hot water circulating pump 2 is arranged on the pipeline. So designed, 95 ℃ hot water in the hot water tank 3 enters the first heat exchange tube 17 through the hot water circulating pump 2 to exchange heat with the flue gas of the heat conduction oil furnace to 115 ℃ hot water, 115 ℃ hot water enters the second heat exchange tube 18 through a pipeline to provide heat for high-temperature high-pressure ammonia gas evaporated by the high-pressure ammonia-rich liquid absorbent in the generator 6, the high-pressure ammonia-rich liquid absorbent absorbs heat to evaporate high-temperature high-pressure ammonia gas, the rest high-pressure ammonia-lean liquid absorbent flows back to the absorber 4 after being throttled to low-pressure ammonia-lean liquid absorbent through the pipeline, and the 115 ℃ hot water is changed into 95 ℃ hot water again after heat exchange and flows back to the hot water tank 3 through the pipeline, so that a cycle is formed, and energy and water are saved.
The invention relates to an energy-saving system in an ABS production system, which takes hot water as a carrier, utilizes the waste heat of flue gas of a heat conduction oil furnace to heat the hot water at 95 ℃ to 115 ℃ and send the hot water to an ammonia absorption refrigeration device, and is used as a heat source to drive a refrigeration medium to work, and the ammonia absorption refrigeration device reduces the temperature of frozen backwater from 0 ℃ to-5 ℃ for a user to use; the temperature of the hot water after releasing heat is reduced to 95 ℃ and returned to the hot water tank for circulating 3 times by the residual pressure of the hot water tank. The specific process is as follows:
the flue gas generated by the heat conduction oil furnace is heated to the temperature of between 280 ℃ and 95 ℃ hot water from the hot water tank 3 through a first heat exchange tube to 115 ℃; the 115 ℃ hot water is used as a carrier to take away the heat of 1860kW (taking-5 ℃/0 ℃ frozen water for preparing 1000kW cold energy as an example) from the flue gas of the heat conduction oil furnace to the ammonia absorption refrigeration device as a heat source.
The temperature of 115 ℃ hot water after releasing heat in the generator 6 of the ammonia absorption refrigeration device is reduced to 95 ℃ and returns to the hot water tank 3 by the residual pressure of the hot water, and the 95 ℃ hot water is pressurized by the hot water circulating pump and then is sent into the first heat exchange tube in the flue gas channel in the heat conduction oil furnace to be heated to 115 ℃ by flue gas, so that a hot water circulating system is formed.
The generator 6 of the ammonia absorption refrigeration device utilizes the heat of 115 ℃ hot water to evaporate high-temperature and high-pressure ammonia-rich liquid absorbent at the high pressure side of the ammonia absorption refrigeration device, the temperature of the hot water is reduced to 95 ℃, the ammonia is condensed by the ammonia condenser 7 and becomes high-pressure liquid ammonia, the high-pressure liquid ammonia is throttled by the first throttle valve 7 and then reduced in temperature and pressure, the low-pressure ammonia is evaporated by the evaporator 8 at the low pressure side, the temperature of chilled water in the tube pass of the evaporator 8 is reduced from 0 ℃ to minus 5 ℃, the low-pressure ammonia absorber 4 is absorbed by the ammonia-poor liquid absorbent, the liquid absorbent absorbing ammonia is pressurized by the booster pump and then enters the high pressure side of the generator 6, and a part of liquid absorbent of the generator 6 is throttled and then returned to the absorber 4 for absorbing the ammonia.
Chilled water at minus 5 ℃ generated in the tube pass of the evaporator 8 of the ammonia absorption refrigeration device is sent to a user, the temperature of the chilled water after heat exchange of the user is increased to 0 ℃ from minus 5 ℃, the chilled water at 0 ℃ flows back to the chilled water tank by the residual pressure of the chilled water tank, and the chilled water is sent to the ammonia absorption refrigeration device after being pressurized by the chilled water circulating pump, so that the continuous operation of the chilled water circulating system is formed.
In embodiment 10, as shown in fig. 1, in the method for an energy-saving system in an ABS production system provided by the invention, the heat of high-temperature flue gas in a heat conduction oil furnace is replaced into a generator in an ammonia absorption refrigeration device by a heat exchange mechanism to be used as a heat source, a high-pressure ammonia-rich liquid absorbent in the generator absorbs heat and is gasified into high-temperature high-pressure ammonia, the high-temperature high-pressure ammonia is condensed into high-pressure liquid ammonia, then enters an evaporator to be evaporated into low-pressure ammonia and is recycled into the generator, and after a pipeline for supplying chilled water for a condenser passes through the evaporator, the chilled water in the pipeline is reduced from 0 ℃ to-5 ℃ to realize that the chilled water at 0 ℃ is used as the chilled water for the condenser to provide the chilled water at-5 ℃.
The invention utilizes the waste heat of the flue gas of the heat conduction oil furnace to heat the hot water at 95 ℃ to 115 ℃ and send the hot water to the ammonia absorption refrigeration device, and the hot water is used as a heat source to drive the refrigeration medium to work, so that the temperature of the frozen backwater is reduced from 0 ℃ to-5 ℃ for users to use; the temperature of the hot water after releasing heat is reduced to 95 ℃ and returned to the hot water tank for recycling by the residual pressure of the hot water tank.
The temperature of the flue gas from the heat conduction oil furnace is 280 ℃ below zero, and hot water at 95 ℃ below zero is heated to 115 ℃ below zero through the first heat exchange tube; the hot water is used as a carrier to bring heat of 1860kW (taking frozen water of-5 ℃/0 ℃ for preparing 1000kW cold energy as an example) to the ammonia absorption refrigeration device from the flue gas of the heat conduction oil furnace.
The generator of the ammonia absorption refrigeration device utilizes the heat of 115 ℃ hot water to evaporate high-temperature high-pressure ammonia from the ammonia-rich liquid absorbent at the high pressure side of the ammonia absorption refrigeration device, the temperature of the hot water is reduced to 95 ℃, the high-temperature high-pressure ammonia is condensed by a condenser and becomes high-pressure liquid ammonia, the high-pressure liquid ammonia is throttled and then reduced in temperature and pressure and evaporated into low-pressure ammonia in the evaporator at the low pressure side of the generator, the temperature of chilled water is reduced from 0 ℃ to minus 5 ℃ for a user, the low-pressure ammonia absorber is absorbed by the lean ammonia liquid absorbent, the liquid absorbent absorbing the gas ammonia is pressurized by a booster pump and then flows back to the absorber for absorbing the gas ammonia after being throttled.
The heat exchange mechanism consists of a hot water tank, a hot water circulating pump, a first heat exchange pipe and a second heat exchange pipe: after the ammonia absorption refrigerating device releases heat, hot water with the temperature of 95 ℃ flows back to the hot water tank by the residual pressure of the hot water tank, is pressurized by the hot water circulating pump, is sent to the first heat exchange tube, is heated to 115 ℃ by flue gas, is sent to the second heat exchange tube to serve as a heat source, and drives the refrigerating medium to work.
Wherein the chilled water circulation system is an open circulation system consisting of a normal-pressure chilled water tank, a chilled water circulation pump, an evaporator tube and a chilled water user (a condenser 11 in a devolatilization process of an ABS production system); a closed circulation system may also be employed.
The heat conduction oil furnace system 20 comprises a heat conduction oil furnace, a heat conduction oil supply pipe 21 and a heat conduction oil return pipe 22 which are respectively connected with the heat conduction oil furnace, and a first heat exchange pipe arranged in a flue gas channel in the heat conduction oil furnace. The waste heat driven ammonia absorption refrigerating device replaces an electrically driven compression refrigerating unit, so that the electricity consumption is greatly reduced, and the economical efficiency is ensured. The temperature of the water return water on the ammonia absorption refrigeration device is controlled at-5 ℃/0 ℃, so that the investment is saved, and the energy consumption is reduced. The temperature of the water returned from the heat exchange mechanism is controlled at 115 ℃/95 ℃ so as to save investment. The chilled water circulation system can adopt an open circulation system or a closed circulation system.
For an ABS factory with an emulsion grafting-bulk SAN blending method of 20 ten thousand tons/year, an SAN device adopts a refrigerating unit with electric drive compression capacity of 1000kW, the electric power consumption of the refrigerating unit is 360kW, the electric power consumption of a pump of the technical machine is 60kW, and the annual energy is 2,400,000kWh. The industrial electricity price is calculated by 0.6 yuan/kWh, the invention is applied to 144 ten thousand yuan in the production of ABS by an emulsion grafting-bulk SAN blending method and a continuous bulk method. Therefore, the invention has higher popularization value and is suitable for great popularization and application.
Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present invention to illustrate the technical solution of the present invention, but not to limit the scope of the present invention. All the changes or color-rendering which are made in the main design idea and spirit of the invention and which are not significant are considered to be the same as the invention, and all the technical problems which are solved are included in the protection scope of the invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the scope of the invention.
Claims (10)
1. The energy-saving system in the ABS production system is characterized by comprising a heat conduction oil furnace (1) for providing heat conduction oil for an emulsion grafting-bulk SAN blending method and a continuous bulk ABS production system, a condenser (11) in a devolatilization process of the ABS production system, a chilled water tank (10) for providing chilled water for the condenser (11), an ammonia absorption refrigeration device connected between the chilled water tank (10) and the condenser (11) for cooling the chilled water, and a heat exchange mechanism respectively connected with the heat conduction oil furnace (1) and the ammonia absorption refrigeration device and used for exchanging the heat of flue gas in the heat conduction oil furnace (1) into the refrigeration power of the ammonia absorption refrigeration device.
2. An energy saving system in an ABS production system according to claim 1, wherein the ammonia absorption refrigeration means comprises a generator (6) connected to the heat exchange means and storing the high pressure ammonia rich liquid absorbent, an evaporator (8) connected between the chilled water tank (10) and the condenser (11), an absorber (4) connected to the generator (6) and storing the ammonia lean liquid absorbent, and a gas ammonia condenser (7) connected to the evaporator (8) and connected to the generator (6).
3. An energy saving system in an ABS production system according to claim 2, characterized in that the air ammonia condenser (7) is connected to the evaporator (8) via a pipe and that the pipe is provided with a first throttle valve (12).
4. An energy saving system in an ABS production system according to claim 2, characterized in that the absorber (4) is connected to the generator (6) by a pipe and that the pipe is provided with a booster pump (5).
5. An energy saving system in an ABS production system according to claim 2, characterized in that a lean ammonia liquid absorbent return pipe (13) is connected between the generator (6) and the absorber (4), and that a second throttle valve (14) is arranged on the lean ammonia liquid absorbent return pipe (13).
6. The energy-saving system in an ABS production system according to claim 2, wherein the evaporator (8) is a shell-and-tube evaporator, the shell side of the evaporator (8) is respectively connected with the ammonia condenser (7) and the absorber (4), a chilled water conveying pipe (15) is connected between the chilled water tank (10) and the condenser (11), and the tube side of the evaporator (8) is communicated with the chilled water conveying pipe (15).
7. An energy saving system in an ABS production system according to claim 6, wherein the chilled water circulation pump (9) is provided on the chilled water delivery pipe (15).
8. An energy saving system in an ABS production system according to claim 1, characterized in that a chilled water return line (16) is connected between the chilled water tank (10) and the condenser (11).
9. An energy saving system in an ABS production system according to any one of claims 1 to 8, wherein the heat exchanging means comprises a first heat exchanging tube (17) provided in a flue gas passage in the heat conducting oil furnace (1), a second heat exchanging tube (18) connected to the first heat exchanging tube (17) and provided in the generator (6), and a hot water tank (3) connected to the first heat exchanging tube (17) and connected to the second heat exchanging tube (18); the hot water tank (3) is connected with the first heat exchange tube (17) through a pipeline, and a hot water circulating pump (2) is arranged on the pipeline.
10. The method for energy saving system in ABS production system according to any one of claims 1 to 9 wherein the heat of high temperature flue gas in the conduction oil furnace is replaced by a heat exchange mechanism to the generator in the ammonia absorption refrigeration device to be used as a heat source, the high pressure ammonia-rich liquid absorbent in the generator absorbs heat and evaporates into high pressure ammonia with high pressure, the high pressure ammonia with high pressure is condensed into high pressure liquid ammonia, throttled and evaporated into low pressure ammonia by the evaporator, and recycled into the generator, and the chilled water in the pipeline for supplying chilled water to the condenser is reduced from 0 ℃ to-5 ℃ after passing through the evaporator to realize the purpose of providing chilled water at-5 ℃ to the condenser.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102052799A (en) * | 2009-10-27 | 2011-05-11 | 中国石油化工股份有限公司 | Device for producing low-temperature water by using waste heat |
| CN102052801A (en) * | 2009-10-27 | 2011-05-11 | 中国石油化工股份有限公司 | Refrigeration and heat pump device driven by using high-temperature flue gas |
| CN103335443A (en) * | 2013-06-19 | 2013-10-02 | 刘志红 | Waste heat recovered refrigeration air conditioning system |
| CN108276528A (en) * | 2017-12-27 | 2018-07-13 | 北方华锦化学工业股份有限公司 | A kind of environment protection type ABS resin and preparation method thereof |
| CN110294445A (en) * | 2019-07-23 | 2019-10-01 | 同方节能装备有限公司 | A kind of low-temperature flue gas waste heat utilization system in bottled drink production |
| CN111649338A (en) * | 2020-05-07 | 2020-09-11 | 浙江工业大学 | Method for comprehensively treating marine organic solid waste |
| CN211623643U (en) * | 2019-10-26 | 2020-10-02 | 辽宁金碳碳管理有限责任公司 | Waste heat recovery system of air compressor |
-
2022
- 2022-11-22 CN CN202211463718.5A patent/CN116147219A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102052799A (en) * | 2009-10-27 | 2011-05-11 | 中国石油化工股份有限公司 | Device for producing low-temperature water by using waste heat |
| CN102052801A (en) * | 2009-10-27 | 2011-05-11 | 中国石油化工股份有限公司 | Refrigeration and heat pump device driven by using high-temperature flue gas |
| CN103335443A (en) * | 2013-06-19 | 2013-10-02 | 刘志红 | Waste heat recovered refrigeration air conditioning system |
| CN108276528A (en) * | 2017-12-27 | 2018-07-13 | 北方华锦化学工业股份有限公司 | A kind of environment protection type ABS resin and preparation method thereof |
| CN110294445A (en) * | 2019-07-23 | 2019-10-01 | 同方节能装备有限公司 | A kind of low-temperature flue gas waste heat utilization system in bottled drink production |
| CN211623643U (en) * | 2019-10-26 | 2020-10-02 | 辽宁金碳碳管理有限责任公司 | Waste heat recovery system of air compressor |
| CN111649338A (en) * | 2020-05-07 | 2020-09-11 | 浙江工业大学 | Method for comprehensively treating marine organic solid waste |
Non-Patent Citations (2)
| Title |
|---|
| 刘宏吉;: "国内外聚苯乙烯工艺技术分析", 弹性体, no. 03, 25 June 2013 (2013-06-25) * |
| 周保国;: "浅析本体法ABS装置中的导生油系统", 合成技术及应用, no. 04, 30 December 2006 (2006-12-30), pages 56 * |
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