CN102827623A - Method and system for recycling waste heat of ammonia water - Google Patents
Method and system for recycling waste heat of ammonia water Download PDFInfo
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- CN102827623A CN102827623A CN2012103299406A CN201210329940A CN102827623A CN 102827623 A CN102827623 A CN 102827623A CN 2012103299406 A CN2012103299406 A CN 2012103299406A CN 201210329940 A CN201210329940 A CN 201210329940A CN 102827623 A CN102827623 A CN 102827623A
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims abstract description 123
- 239000002918 waste heat Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004064 recycling Methods 0.000 title claims abstract description 32
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 205
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 181
- 239000007789 gas Substances 0.000 claims abstract description 66
- 239000000571 coke Substances 0.000 claims abstract description 54
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000005057 refrigeration Methods 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 91
- 239000002826 coolant Substances 0.000 claims description 68
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000003303 reheating Methods 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 7
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000003507 refrigerant Substances 0.000 abstract description 3
- 229940059936 lithium bromide Drugs 0.000 abstract 3
- 238000004939 coking Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 239000000243 solution Substances 0.000 description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 13
- 239000006096 absorbing agent Substances 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention provides a method and a system for recycling waste heat of ammonia water. The method comprises the following steps: circulating circulatory ammonia water into a gas collecting pipe of a coke oven, cooling raw gas for the first time, heating the circulatory ammonia water, feeding the heated circulatory ammonia water into a heat exchange device, and heating the circulating water in the heat exchange device; circulating the circulating water heated in the heat exchange device into a lithium-bromide absorption-type refrigerating machine as a heat source to refrigerate frozen water in the lithium-bromide absorption-type refrigerating machine; meanwhile, circulating a refrigerant into the lithium-bromide absorption-type refrigerating machine; and feeding the cooled circulating water to the heat exchange device and heating again. According to the method provided by the invention, the waste heat in the circulatory ammonia water is effectively recycled and is used for refrigeration, the waste heat recovery rate of the circulatory ammonia water is improved, and the waste of the energy is effectively avoided.
Description
Technical Field
The invention relates to the field of coking, in particular to a method and a system for recycling waste heat of ammonia water.
Background
Coking enterprises are important energy production departments, and coking is a technological process of heating coking coal to about 1000 ℃ under the condition of air isolation and producing coke, coke oven gas and coking chemical products through high-temperature dry distillation. In the product after coking, red hot coke and raw gas are in a high-temperature state and contain a large amount of heat energy. Therefore, the raw coke oven gas needs to be introduced into the coke oven gas collecting pipe, the coke oven gas collecting pipe is arranged in the ammonia water circulation loop, the ammonia water is sent into the coke oven gas collecting pipe through the ammonia water circulation pump, then the ammonia water is continuously sprayed into the coke oven gas collecting pipe to cool the raw coke oven gas, and then a large amount of heat energy carried by the raw coke oven gas is transferred into the circulating ammonia water, so that the primary cooling treatment of the raw coke oven gas is realized, and then the primary cooled raw coke oven gas is cooled secondarily through the primary cooler. However, at present, few systems for recovering the waste heat in the circulating ammonia water exist, so that the heat energy carried in the circulating ammonia water is wasted, and the energy is wasted.
At present, there is a small amount of coking enterprises to carry out recycle to circulation aqueous ammonia waste heat, and its scheme is: and heating the circulating water for heating by using the circulating ammonia water through heat exchange equipment, and then supplying the heated heating circulating water for heating equipment. Although this scheme is retrieved the waste heat of circulation aqueous ammonia and is used for the heating, it has following drawback:
firstly, the recovered waste heat of the circulating ammonia water is used for heating, and the waste heat of the circulating ammonia water only has a use value in winter, and coking enterprises generally carry out production all the year round, so the recovery and utilization rate of the waste heat of the circulating ammonia water is low.
Secondly, heating equipment needs to dispose each user with heating circulating water pipeline, and the coking enterprise mostly keeps away from the living area, and so, its pipeline laying distance is longer, invests in too much, and then does not have actual meaning to most coking enterprises.
Finally, because the circulating ammonia water has certain corrosivity, if the circulating ammonia water leaks into the heating circulating water due to corrosion or other reasons, the health of heating users can be damaged, and the reliability of the use of the circulating ammonia water is not high.
Therefore, how to effectively recover and utilize the waste heat of the circulating ammonia water in the coking system becomes the problem which needs to be solved urgently at present.
Disclosure of Invention
An object of the present invention is to provide an ammonia water waste heat recycling method, which effectively recycles the waste heat in the circulating ammonia water and uses the waste heat for refrigeration, thereby improving the recycling rate of the waste heat of the circulating ammonia water and effectively avoiding the waste of energy.
Another object of the present invention is to provide an ammonia water waste heat recycling system, which effectively recycles the waste heat in the circulating ammonia water, and uses the waste heat for refrigeration, thereby improving the recycling rate of the waste heat of the circulating ammonia water and effectively avoiding the waste of energy.
The invention provides a method for recycling waste heat of ammonia water, which comprises the following steps of firstly introducing circulating ammonia water into a gas collecting pipe of a coke oven, carrying out primary cooling on raw coke oven gas, and heating the circulating ammonia water, and further comprises the following steps:
feeding the heated circulating ammonia water into a heat exchange device, and heating the circulating water in the heat exchange device;
introducing the circulating water heated in the heat exchange device into a lithium bromide absorption refrigerator to serve as a heat source for refrigerating the chilled water introduced into the lithium bromide absorption refrigerator; simultaneously introducing a coolant into the lithium bromide absorption refrigerator;
and returning the cooled circulating water to the heat exchange device for reheating.
Optionally, the refrigerated water after refrigeration is sent into a primary cooler to carry out secondary cooling on the raw coke oven gas.
Optionally, the coolant discharged from the lithium bromide absorption refrigerator is cooled and then introduced into the lithium bromide absorption refrigerator.
Optionally, the step of introducing the circulating water heated in the heat exchange device into the lithium bromide absorption refrigerator further comprises: monitoring the conductivity of the circulating water;
and/or the presence of a gas in the gas,
the step of sending the cooled circulating water back to the heat exchange device for reheating further comprises: and monitoring the conductivity of the circulating water.
Optionally, before the step of feeding the heated circulating ammonia water to the heat exchanger, the method further comprises: and removing tar deposition formed by tar in the circulating ammonia water in the heat exchange device by using low-pressure water vapor.
The invention also provides an ammonia water waste heat recycling system, which comprises a coke oven gas collecting pipe and an ammonia water circulating pump, wherein a water outlet of the coke oven gas collecting pipe is connected with a water inlet of the coke oven gas collecting pipe to form a first circulating loop, the first circulating loop is provided with the circulating ammonia water pump, and the system also comprises at least one heat exchange device and a lithium bromide absorption refrigerator; wherein,
a first pipeline and a second pipeline are arranged in the heat exchange device, a water outlet of the coke oven gas collecting pipe is connected with an inlet of the first pipeline, and a water inlet of the coke oven gas collecting pipe is connected with an outlet of the first pipeline;
the outlet of the second pipeline is connected with a hot water inlet 41 of the lithium bromide absorption refrigerator, the inlet of the second pipeline is connected with a hot water outlet 42 of the lithium bromide absorption refrigerator to form a second circulation loop, and a circulation water pump 5 is arranged on the second circulation loop;
the lithium bromide absorption refrigerator is provided with a coolant inlet and a coolant outlet, and coolant enters through the coolant inlet and is discharged through the coolant outlet;
the lithium bromide absorption refrigerator is also provided with a chilled water inlet and a chilled water outlet.
Optionally, the system further comprises a primary cooler, wherein a third pipeline is arranged in the primary cooler;
the inlet of the third pipeline is connected with the chilled water outlet, the outlet of the third pipeline is connected with the chilled water inlet, a third circulation loop is formed, and a chilled water circulation pump is arranged on the third circulation loop.
Optionally, the system further comprises a coolant circulation device, wherein the coolant circulation device comprises a cooling tower and a coolant circulation pump;
and the water outlet of the cooling tower is connected with the coolant inlet, the water inlet of the cooling tower is connected with the coolant outlet to form a fourth circulation loop, and the coolant circulation pump is arranged on the fourth circulation loop.
Optionally, a conductivity detector is disposed on the second circulation loop.
Optionally, the first pipeline is connected with a water vapor inlet pipe, and the water vapor inlet pipe is connected with a low-pressure water vapor source device.
Compared with the prior art, the method for recycling the waste heat of the ammonia water has the advantages that the heat in the heated circulating ammonia water is recycled through the heat exchange device and is used for heating the circulating water, then the heated circulating water is used as a heat source, the lithium bromide absorption refrigerator is used for refrigerating the chilled water, the coolant is simultaneously introduced into the lithium bromide absorption refrigerator to ensure the normal work of the lithium bromide absorption refrigerator, and finally the cooled circulating water is returned to the heat exchange device for reheating, so that the cyclic utilization is realized; thereby effectively recycling the waste heat in the circulating ammonia water and being used for refrigeration, improving the recycling rate of the waste heat of the circulating ammonia water and effectively avoiding the waste of energy.
In a further technical scheme, chilled water refrigerated by a lithium bromide absorption refrigerator is introduced into a primary cooler and is used for carrying out secondary cooling on raw coke oven gas; the available lithium bromide absorption refrigerator replaces the existing refrigerator for refrigerating and cooling the primary cooler, thereby saving the consumption of the existing refrigerator to the energy, further avoiding the consumption of the energy and having obvious energy-saving effect.
In a further technical scheme, after cooling the coolant discharged from the lithium bromide absorption refrigerator, the coolant is introduced into the lithium bromide absorption refrigerator; the circulating cooling water is introduced into the lithium bromide absorption refrigerator, and the normal and continuous operation of the lithium bromide absorption refrigerator is effectively ensured.
In further technical scheme, it lets in lithium bromide absorption formula refrigerator and sends back the circulating water after the cooling at the circulating water during heat transfer device, carries out the conductivity monitoring to the circulating water, monitors the conductivity of circulating water to can in time discover the condition that circulating ammonia leaks to the circulating water because of corruption or other reasons cluster, and through shutting down to aqueous ammonia waste heat recovery system, avoid circulating ammonia to the corruption of lithium bromide absorption formula refrigerator, and then the effectual lithium bromide absorption formula refrigerator of having guaranteed, make its operation safe, reliable.
In a further technical scheme, before the circulation aqueous ammonia after will heating is sent into heat transfer device, utilize low pressure steam to effectively clear up the tar deposit that the tar of circulation aqueous ammonia formed in heat transfer device, can prevent that the first pipeline in the heat transfer device from taking place to block up to heat transfer device's heat exchange efficiency can be guaranteed.
The ammonia water waste heat recycling system provided by the invention has corresponding technical characteristics with the ammonia water waste heat recycling method, so that corresponding technical effects are generated, and further description is omitted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram showing an ammonia water waste heat recycling method and system according to the present invention in a flow chart manner.
Description of the drawings:
1-a gas collecting pipe of the coke oven; 2-ammonia water circulating pump; 3-heat exchange device, 31-first pipeline, 32-second pipeline;
4-lithium bromide absorption refrigerator, 41-hot water inlet, 42-hot water outlet, 43-chilled water inlet, 44-chilled water outlet, 45-coolant inlet, 46-coolant outlet;
5-a circulating water pump; 6-primary cooler, 61-third pipeline; 7-chilled water circulating pump;
8-coolant circulation equipment, 81-cooling tower, 82-coolant circulation pump;
9-conductivity detector; 10-water vapor inlet pipe; 11-low pressure water vapor gas source device; 12-expansion tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and more complete, the following technical solutions of the present invention will be described in detail, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the specific embodiments of the present invention belong to the protection scope of the present invention.
Example one
As shown in fig. 1, the method for recycling waste heat of ammonia water provided in this embodiment includes introducing circulating ammonia water into a gas collecting pipe 1 of a coke oven, cooling crude gas once, and heating the circulating ammonia water, and further includes: feeding the heated circulating ammonia water into the heat exchange device 3, and heating the circulating water in the heat exchange device 3; introducing the circulating water heated in the heat exchange device 3 into a lithium bromide absorption refrigerator 4 as a heat source to refrigerate the chilled water introduced into the lithium bromide absorption refrigerator 4; introducing a coolant into the lithium bromide absorption refrigerator 4; and returning the cooled circulating water to the heat exchange device 3 for reheating.
The heat in the heated circulating ammonia water is recovered through the heat exchange device 3 and is used for heating the circulating water, then the heated circulating water is used as a heat source, the lithium bromide absorption refrigerator 4 is used for refrigerating the chilled water, a coolant is introduced into the lithium bromide absorption refrigerator 4 to ensure the normal work of the lithium bromide absorption refrigerator 4, and finally the cooled circulating water is sent back to the heat exchange device 3 for reheating, so that the cyclic utilization is realized; thereby effectively recycling the waste heat in the circulating ammonia water and being used for refrigeration, improving the recycling rate of the waste heat of the circulating ammonia water and effectively avoiding the waste of energy.
In the embodiment, in the coking process, after the primary cooling treatment is performed on the raw coke oven gas by using the circulating ammonia water, the raw coke oven gas after the primary cooling needs to be subjected to secondary cooling in the primary cooler 6, and a large amount of chilled water is needed when the primary cooler 6 is cooled; at present, a refrigerator is mostly arranged for providing chilled water into the primary cooler 6; however, in the existing refrigerator, if an electric refrigerator (i.e., compressor refrigeration), a gas direct-fired refrigerator (i.e., direct-fired lithium bromide refrigerator) and a steam refrigerator (i.e., steam type lithium bromide refrigerator) are arranged, additional energy sources need to be consumed, i.e., the electric refrigerator needs to consume electric energy, the gas direct-fired refrigerator needs to consume gas, and the steam refrigerator needs to consume steam; therefore, the chilled water refrigerated by the lithium bromide absorption refrigerator 4 can be directly sent into the primary cooler 6 for secondary cooling of the raw coke oven gas; therefore, the lithium bromide absorption type refrigerator 4 is used for replacing the existing refrigerator for refrigerating and cooling the primary cooler 6, the consumption of the existing refrigerator on energy is saved, the consumption of the energy is further avoided, and the energy-saving effect is obvious.
In this embodiment, the refrigeration process of the lithium bromide absorption refrigerator 4 specifically includes: when the lithium bromide water solution is heated by the heating medium water in the generator, the water in the solution is continuously vaporized; along with the continuous vaporization of water, the concentration of the lithium bromide aqueous solution in the generator is continuously increased and enters the absorber; the water vapor enters a condenser, is cooled by a coolant in the condenser and then is condensed to form high-pressure low-temperature liquid water; when the water in the condenser enters the evaporator through the throttle valve, the water expands rapidly to be vaporized, and absorbs a large amount of heat of the refrigerant water in the evaporator in the vaporization process, thereby achieving the purpose of cooling and refrigeration; in the process, low-temperature water vapor enters the absorber, is absorbed by the lithium bromide aqueous solution in the absorber, the concentration of the solution is gradually reduced, and then the solution is sent back to the generator by the circulating pump to complete the whole circulation, so that a coolant needs to be continuously introduced into the lithium bromide absorption type refrigerating machine 4 to ensure the normal and continuous operation of the machine; therefore, the coolant discharged from the lithium bromide absorption refrigerator 4 can be cooled and then introduced into the lithium bromide absorption refrigerator 4, so that the circulating coolant is introduced into the lithium bromide absorption refrigerator 4, and the circulating coolant is provided for the lithium bromide absorption refrigerator 4, thereby effectively ensuring the normal and continuous operation of the lithium bromide absorption refrigerator 4.
In this embodiment, the circulating ammonia water contains ammonia and other ions, which have a certain corrosiveness and corrode a conveying pipeline of the circulating ammonia water, and if the circulating ammonia water leaks into the circulating water due to corrosion or other reasons, the lithium bromide absorption refrigerator 4 can be corroded or even damaged, and in order to find out the condition that the circulating ammonia water leaks into the circulating water in time, the circulating ammonia water is prevented from corroding the lithium bromide absorption refrigerator 4; therefore, when circulating water heated in the heat exchange device 3 is introduced into the lithium bromide absorption refrigerator 4 and/or when the cooled circulating water is sent back to the heat exchange device 3 for reheating, conductivity monitoring is carried out on the circulating water, and when the conductivity in the circulating water is abnormal, the machine can be stopped for checking, so that the lithium bromide absorption refrigerator 4 is effectively ensured, and the operation is safe and reliable.
In the embodiment, the heating process is completed while the raw coke oven gas is cooled by the circulating ammonia water, a certain amount of tar can be mixed while the raw coke oven gas is sprayed by the circulating ammonia water in the heating process, and the tar is easy to attach to the first pipeline 31 in the heat exchange device 3, so that deposition is caused on the pipe wall, the problem of blockage is caused, and the heat exchange efficiency of the heat exchange device 3 is influenced; therefore, before the heated circulating ammonia water is sent to the heat exchange device 3 (namely before the heat exchange device 3 is started), or after the circulating ammonia water is stopped being sent to the heat exchange device 3 (namely before the heat exchange device 3 is started next time), tar deposition formed in the heat exchange device 3 by tar in the circulating ammonia water is removed by using low-pressure steam, so that the first pipeline 31 in the heat exchange device 3 is effectively prevented from being blocked, and the heat exchange efficiency of the heat exchange device 3 can be ensured.
Example two
As shown in fig. 1, the ammonia water waste heat recycling system provided in this embodiment includes a coke oven gas collecting pipe 1 and an ammonia water circulating pump 2, a water outlet of the coke oven gas collecting pipe 1 is connected to a water inlet of the coke oven gas collecting pipe 1 to form a first circulating loop, the first circulating loop is provided with a circulating ammonia water pump, and the system further includes at least one heat exchange device 3 and a lithium bromide absorption refrigerator 4; a first pipeline 31 and a second pipeline 32 are arranged in the heat exchange device 3, a water outlet of the coke oven gas collecting pipe 1 is connected with an inlet of the first pipeline 31, and a water inlet of the coke oven gas collecting pipe 1 is connected with an outlet of the first pipeline 31; the outlet of the second pipeline 32 is connected with a hot water inlet 41 of the lithium bromide absorption refrigerator 4, the inlet of the second pipeline 32 is connected with a hot water outlet 42 of the lithium bromide absorption refrigerator 4, a second circulation loop is formed, and a circulation water pump 5 is arranged on the second circulation loop; the lithium bromide absorption refrigerator 4 is provided with a coolant inlet 45 and a coolant outlet 46, and the coolant enters through the coolant inlet 45 and is discharged through the coolant outlet 46; the lithium bromide absorption refrigerator 4 is also provided with a chilled water inlet 43 and a chilled water outlet 44.
The working process is as follows: circulating ammonia water is introduced into a coke oven gas collecting pipe 1 through an ammonia water circulating pump 2, raw coke oven gas introduced into the coke oven gas collecting pipe 1 is sprayed and cooled through a water inlet of the coke oven gas collecting pipe 1, meanwhile, the circulating ammonia water absorbs heat, then the circulating ammonia water after heat absorption is pumped out through a water outlet of the coke oven gas collecting pipe 1 by a circulating ammonia water pump and is conveyed to an inlet of a first pipeline 31 in a heat exchange device 3, and the circulating ammonia water enters the heat exchange device 3, and then is discharged from an outlet of the first pipeline 31 and is conveyed back to the water inlet of the coke oven gas collecting pipe 1, so that a first circulating loop is formed; in the heat exchange device 3, the heated circulating ammonia water in the first pipeline 31 is used for heating the circulating water in the second pipeline 32, the heated circulating water is introduced into a hot water inlet 41 of the lithium bromide absorption refrigerator 4 through an outlet of the second pipeline 32 and enters the lithium bromide absorption refrigerator 4 as a heat source, the chilled water enters through a chilled water inlet 43 on the lithium bromide absorption refrigerator 4 and completes the refrigeration process in the lithium bromide absorption refrigerator 4, the chilled water after refrigeration is discharged through a chilled water outlet 44 on the lithium bromide absorption refrigerator 4, the coolant enters through a coolant inlet 45 on the lithium bromide absorption refrigerator 4 to provide the coolant for the normal operation of the lithium bromide absorption refrigerator 4 and is discharged from a coolant outlet 46 on the lithium bromide absorption refrigerator 4, and finally the cooled circulating water is discharged through a hot water outlet 42 on the lithium bromide absorption refrigerator 4 and is sent back to the inlet of the second pipeline 32, thereby forming a second circulation loop. The waste heat recovery device effectively recovers the waste heat in the circulating ammonia water and is used for refrigeration, so that the waste heat recovery utilization rate of the circulating ammonia water is improved, and the waste of energy is effectively avoided.
The number of the heat exchange devices 3 may be one or more, and the heat exchange devices 3 may be spiral plate heat exchangers, or the like.
In this embodiment, since the circulating water in the second circulation loop needs to be heated, and the heated circulating water has a certain expansion amount, an expansion water tank 12 may be further added in the second circulation loop to accommodate and compensate the expansion and contraction amount of the circulating water in the second circulation loop; the specific setting mode can be as follows: set up circulating water pump 5 between the export of second pipeline 32 and the hot water import 41 of lithium bromide absorption refrigerator 4, then set up an expansion tank 12 between the export of second pipeline 32 and circulating water pump 5, so, after the circulating water heats through heat transfer device 3, can advance into expansion tank 12 in, and compensate the inflation volume of circulating water, then send the circulating water into lithium bromide absorption refrigerator 4 through circulating water pump 5.
In the embodiment, in the coking process, after the primary cooling treatment is performed on the raw coke oven gas by using the circulating ammonia water, the raw coke oven gas after the primary cooling needs to be subjected to secondary cooling in the primary cooler 6, and a large amount of chilled water is needed when the primary cooler 6 is cooled; at present, a refrigerator is mostly arranged for providing chilled water into the primary cooler 6; however, in the existing refrigerator, if an electric refrigerator (i.e., compressor refrigeration), a gas direct-fired refrigerator (i.e., direct-fired lithium bromide refrigerator) and a steam refrigerator (i.e., steam type lithium bromide refrigerator) are arranged, additional energy sources need to be consumed, i.e., the electric refrigerator needs to consume electric energy, the gas direct-fired refrigerator needs to consume gas, and the steam refrigerator needs to consume steam; therefore, the chilled water refrigerated by the lithium bromide absorption refrigerator 4 can be directly sent into the primary cooler 6 for secondary cooling of the raw coke oven gas; the method specifically comprises the following steps: a third pipeline 61 is arranged in the primary cooler 6; the inlet of the third pipeline 61 is connected with the chilled water outlet 44, the outlet of the third pipeline 61 is connected with the chilled water inlet 43, a third circulation loop is formed, and a chilled water circulation pump 7 is arranged on the third circulation loop.
The working process is as follows: the refrigerated water after refrigerating with lithium bromide absorption refrigerator 4 sends into the third pipeline 61 in the primary cooler 6 through refrigerated water export 44 in, then refrigerate the cooling to primary cooler 6, and carry out the secondary cooling with primary cooler 6 to the raw coke oven gas, then send the refrigerated water after will rising temperature back to refrigerated water import 43 from the export of the third pipeline 61 in the primary cooler 6, and refrigerate from newly, and then form the third return circuit, its usable lithium bromide absorption refrigerator 4 replaces the current refrigerator that is used for refrigerating the cooling to primary cooler 6, and then saved the consumption of current refrigerator to the energy, further avoided the consumption of the energy, energy-conserving effect is showing.
The specific embodiment is explained below, wherein 200 ten thousand t/a of coke is produced annually by a large-scale coking enterprise, the large-scale coking enterprise is matched with downstream chemical industry, and the amount of circulating ammonia water is about 2100m3Per hour, the temperature of the circulating ammonia water is 71.7 ℃, and 4 ammonia water with the length of 100m are used2The spiral plate heat exchanger extracts heat, the inlet water temperature of the circulating ammonia water is 71.7 ℃, the outlet water temperature of the circulating ammonia water is 70 ℃, and the extracted heat can be converted into circulating water 667m3And heating the circulating water with the inlet temperature of 63 ℃ to the outlet temperature of 69 ℃; the frozen water with the water inlet temperature of 23 ℃ is refrigerated to 16 ℃ by using a 300 ten thousand large lithium bromide absorption refrigerator and is output, and 428.6m can be refrigerated3The frozen water of (4); thereby replacing one steam with the same refrigerating capacityThe model refrigerator can save 4 tons of 0.8MPa steam per hour, operates 10 months per year, and can save 460.8 ten thousand yuan steam cost per year in terms of 160 yuan per ton of steam, thereby having obvious energy saving and better application and popularization values.
In this embodiment, the refrigeration process of the lithium bromide absorption refrigerator 4 specifically includes: when the lithium bromide water solution is heated by the heating medium water in the generator, the water in the solution is continuously vaporized; along with the continuous vaporization of water, the concentration of the lithium bromide aqueous solution in the generator is continuously increased and enters the absorber; the water vapor enters a condenser, is cooled by a coolant in the condenser and then is condensed to form high-pressure low-temperature liquid water; when the water in the condenser enters the evaporator through the throttle valve, the water expands rapidly to be vaporized, and absorbs a large amount of heat of the refrigerant water in the evaporator in the vaporization process, thereby achieving the purpose of cooling and refrigeration; in the process, low-temperature water vapor enters the absorber, is absorbed by the lithium bromide aqueous solution in the absorber, the concentration of the solution is gradually reduced, and then the solution is sent back to the generator by the circulating pump to complete the whole circulation, so that a coolant needs to be continuously introduced into the lithium bromide absorption type refrigerating machine 4 to ensure the normal and continuous operation of the machine; therefore, the circulating coolant can be introduced into the lithium bromide absorption refrigerator 4 to provide the circulating coolant for the lithium bromide absorption refrigerator 4, thereby effectively ensuring the normal and continuous operation of the lithium bromide absorption refrigerator 4. The method specifically comprises the following steps: a coolant circulation device 8 is provided, the coolant circulation device 8 including a cooling tower 81 and a coolant circulation pump 82; the water outlet of the cooling tower 81 is connected to the coolant inlet 45, the water inlet of the cooling tower 81 is connected to the coolant outlet 46, and a fourth circulation loop is formed, on which a coolant circulation pump 82 is provided.
The working process is as follows: the coolant cooled in the cooling tower 81 is sent to the coolant inlet 45 of the lithium bromide absorption refrigerator 4 through the coolant circulating pump 82, so that the normal operation of the lithium bromide absorption refrigerator 4 is ensured, then the coolant heated in the lithium bromide absorption refrigerator 4 is discharged out of the lithium bromide absorption refrigerator 4 through the coolant outlet 46 and sent back to the cooling tower 81 for re-cooling, and a fourth circulating loop is formed; the circulating coolant is introduced into the lithium bromide absorption refrigerator 4, and the circulating coolant is provided for the lithium bromide absorption refrigerator 4, so that the normal and continuous operation of the lithium bromide absorption refrigerator 4 is effectively ensured.
The coolant may be cooling water or other cooling medium.
In this embodiment, the circulating ammonia water contains ammonia and other ions, which have a certain corrosiveness and corrode a conveying pipeline of the circulating ammonia water, and if the circulating ammonia water leaks into the circulating water due to corrosion or other reasons, the lithium bromide absorption refrigerator 4 can be corroded or even damaged, and in order to find out the condition that the circulating ammonia water leaks into the circulating water in time, the circulating ammonia water is prevented from corroding the lithium bromide absorption refrigerator 4; therefore, the conductivity of the circulating water needs to be monitored, and when the conductivity in the circulating water is abnormal, the machine can be stopped for inspection, so that the lithium bromide absorption refrigerator 4 is effectively ensured to be operated safely and reliably. The method specifically comprises the following steps: a conductivity detector 9 is arranged on the second circuit.
The working process is as follows: the conductivity of the circulating water in the second circulation loop is checked by using the conductivity detector 9, and when the conductivity in the circulating water is abnormal, the lithium bromide absorption type refrigerating machine 4 is stopped, so that the circulating ammonia water leaked into the circulating water can be effectively prevented from corroding the lithium bromide absorption type refrigerating machine 4.
In the embodiment, the heating process is completed while the raw coke oven gas is cooled by the circulating ammonia water, a certain amount of tar can be mixed while the raw coke oven gas is sprayed by the circulating ammonia water in the heating process, and the tar is easy to attach to a circulating pipeline of the circulating ammonia water, so that deposition is caused on the pipe wall, the problem of blockage is caused, and the heat exchange efficiency of the heat exchange device 3 is influenced; therefore, tar deposition formed in the heat exchange device 3 by tar in the circulating ammonia water can be removed by utilizing low-pressure water vapor at regular time, so that the first circulating loop and the heat exchange device 3 are effectively prevented from being blocked, and the heat exchange efficiency of the heat exchange device 3 can be ensured. The method specifically comprises the following steps: the first pipeline 31 is connected with a water vapor inlet pipe 10, the water vapor inlet pipe 10 is connected with a low-pressure water vapor source device 11, and further, valves are required to be arranged on the first pipeline 31 and the water vapor inlet pipe 10.
Its working process does, when the unit during operation, the valve that sets up is in the closed condition on the steam intake pipe 10, after the unit work for a period, can close first pipeline 31 through the valve, then open the valve in the steam intake pipe 10, make the low pressure steam in the low pressure steam air source device 11 enter into first pipeline 31, and clear up the tar deposit on the pipe wall of first pipeline 31, thereby prevent effectively that first pipeline 31 from taking place to block up, and can guarantee heat transfer device 3's heat exchange efficiency.
When tar deposition on the pipe wall of the first pipeline 31 is cleaned, the first pipeline 31 needs to be closed through a valve, so that the first circulation loop cannot normally operate, circulating ammonia water cannot enter the heat exchange device 3 for heat exchange, the whole unit is stopped, unnecessary economic loss is caused, and meanwhile the whole unit cannot exert the maximum working efficiency; therefore, a plurality of heat exchange devices 3 can be arranged, when the first pipeline 31 in one of the heat exchange devices 3 needs to be cleaned, the first pipeline 31 in the heat exchange device 3 which needs to be cleaned is only needed to be broken, and the first pipeline 31 is cleaned through low-pressure water vapor, and other heat exchange devices 3 can still work normally and cannot be influenced, so that the normal operation of the whole unit can be ensured, and the working efficiency of the heat exchange device is greatly improved.
In this embodiment, an online thermometer and an online pressure gauge may be further provided in the first circulation circuit.
The two online thermometers are respectively arranged on a pipeline before the inlet of the first pipeline 31 in the heat exchange device 3 and a pipeline after the outlet of the first pipeline 31 in the heat exchange device 3, and are used for online monitoring of the temperatures of the circulating ammonia water before and after the heat exchange device 3, so that the temperature of the circulating ammonia water can be conveniently controlled.
The two online pressure gauges are respectively arranged on a pipeline before an inlet of the first pipeline 31 in the heat exchange device 3 and a pipeline after an outlet of the first pipeline 31 in the heat exchange device 3, and are used for online monitoring of the pressure of the circulating ammonia water in front of and behind the heat exchange device 3, and the water pressure in the circulating ammonia water is convenient to control.
The ammonia water waste heat recycling system provided in the second embodiment may implement the ammonia water waste heat recycling method provided in the first embodiment, but does not represent that the ammonia water waste heat recycling method provided in the first embodiment is implemented only by the ammonia water waste heat recycling system, and may also be implemented by other methods and systems.
Finally, it should be noted that: the above embodiments and examples are only used to illustrate the technical solution of the present invention, but not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments and examples, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments or examples may still be modified, or some of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments or examples of the present invention.
Claims (10)
1. A method for recycling waste heat of ammonia water comprises the steps of firstly introducing circulating ammonia water into a gas collecting pipe of a coke oven, cooling crude gas once, and heating the circulating ammonia water, and is characterized by further comprising the following steps:
feeding the heated circulating ammonia water into a heat exchange device, and heating the circulating water in the heat exchange device;
introducing the circulating water heated in the heat exchange device into a lithium bromide absorption refrigerator to serve as a heat source for refrigerating the chilled water introduced into the lithium bromide absorption refrigerator; simultaneously introducing a coolant into the lithium bromide absorption refrigerator;
and returning the cooled circulating water to the heat exchange device for reheating.
2. The ammonia water waste heat recycling method of claim 1, wherein the chilled water after refrigeration is sent to a primary cooler to carry out secondary cooling on the raw coke oven gas.
3. The ammonia water waste heat recycling method according to claim 1, wherein the coolant discharged from the lithium bromide absorption refrigerator is cooled and then introduced into the lithium bromide absorption refrigerator.
4. The ammonia water waste heat recovery and utilization method according to any one of claims 1 to 3,
the step of introducing the circulating water heated in the heat exchange device into a lithium bromide absorption refrigerator further comprises the following steps: monitoring the conductivity of the circulating water;
and/or the presence of a gas in the gas,
the step of sending the cooled circulating water back to the heat exchange device for reheating further comprises: and monitoring the conductivity of the circulating water.
5. The ammonia water waste heat recycling method according to any one of claims 1 to 3, further comprising, before the step of feeding the heated circulating ammonia water to the heat exchanging device: and removing tar deposition formed by tar in the circulating ammonia water in the heat exchange device by using low-pressure water vapor.
6. The ammonia water waste heat recycling system comprises a coke oven gas collecting pipe and an ammonia water circulating pump, wherein a water outlet of the coke oven gas collecting pipe is connected with a water inlet of the coke oven gas collecting pipe to form a first circulating loop, and the circulating ammonia water pump is arranged on the first circulating loop; wherein,
a first pipeline and a second pipeline are arranged in the heat exchange device, a water outlet of the coke oven gas collecting pipe is connected with an inlet of the first pipeline, and a water inlet of the coke oven gas collecting pipe is connected with an outlet of the first pipeline;
the outlet of the second pipeline is connected with the hot water inlet of the lithium bromide absorption refrigerator, the inlet of the second pipeline is connected with the hot water outlet of the lithium bromide absorption refrigerator to form a second circulation loop, and a circulation water pump is arranged on the second circulation loop;
the lithium bromide absorption refrigerator is provided with a coolant inlet and a coolant outlet, and coolant enters through the coolant inlet and is discharged through the coolant outlet;
the lithium bromide absorption refrigerator is also provided with a chilled water inlet and a chilled water outlet.
7. The ammonia water waste heat recycling system of claim 6, further comprising a primary cooler, wherein a third pipeline is arranged in the primary cooler;
the inlet of the third pipeline is connected with the chilled water outlet, the outlet of the third pipeline is connected with the chilled water inlet, a third circulation loop is formed, and a chilled water circulation pump is arranged on the third circulation loop.
8. The ammonia water waste heat recovery and utilization system of claim 6, further comprising a coolant circulation device, wherein the coolant circulation device comprises a cooling tower and a coolant circulation pump;
and the water outlet of the cooling tower is connected with the coolant inlet, the water inlet of the cooling tower is connected with the coolant outlet to form a fourth circulation loop, and the coolant circulation pump is arranged on the fourth circulation loop.
9. The ammonia water waste heat recycling system of any one of claims 6 to 8, wherein a conductivity detector is arranged on the second circulation loop.
10. The ammonia water waste heat recycling system of any one of claims 6 to 8, wherein the first pipeline is connected with a water vapor inlet pipe, and the water vapor inlet pipe is connected with a low-pressure water vapor source device.
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| CN2012103299406A CN102827623A (en) | 2012-09-07 | 2012-09-07 | Method and system for recycling waste heat of ammonia water |
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| CN103629854A (en) * | 2013-10-28 | 2014-03-12 | 大连理工大学 | Ammonia and lithium bromide integrated absorption refrigeration device driven by heating medium water and method |
| CN104034090A (en) * | 2014-06-25 | 2014-09-10 | 济钢集团有限公司 | Circulating ammonia waste heat utilization system |
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| CN109253558A (en) * | 2018-03-19 | 2019-01-22 | 华洋通信科技股份有限公司 | A kind of cyclic ammonia water UTILIZATION OF VESIDUAL HEAT IN refrigeration unit automatic back-flushing device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103629854A (en) * | 2013-10-28 | 2014-03-12 | 大连理工大学 | Ammonia and lithium bromide integrated absorption refrigeration device driven by heating medium water and method |
| CN104034090A (en) * | 2014-06-25 | 2014-09-10 | 济钢集团有限公司 | Circulating ammonia waste heat utilization system |
| CN104214990A (en) * | 2014-08-20 | 2014-12-17 | 河南中鸿集团煤化有限公司 | Raw coke oven gas sensible heat recovery cold water preparing system and raw coke oven gas sensible heat recovery cold water preparing method |
| CN104214990B (en) * | 2014-08-20 | 2016-05-11 | 河南中鸿集团煤化有限公司 | A kind of coal oven dithio-gas sensible heat reclaims water refrigeration system and method |
| CN106766342A (en) * | 2016-12-12 | 2017-05-31 | 松下制冷（大连）有限公司 | Ammonia still process column overhead ammonia vapour residual heat system is reclaimed using lithium bromide absorption type heat pump |
| CN109253558A (en) * | 2018-03-19 | 2019-01-22 | 华洋通信科技股份有限公司 | A kind of cyclic ammonia water UTILIZATION OF VESIDUAL HEAT IN refrigeration unit automatic back-flushing device and method |
| CN109253558B (en) * | 2018-03-19 | 2021-02-26 | 华洋通信科技股份有限公司 | Automatic back flushing device and method for refrigerating unit utilizing waste heat of circulating ammonia water |
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Application publication date: 20121219 |