CN116294425A - Blast furnace slag flushing water and exhaust steam waste heat recovery cold and hot combined supply system - Google Patents
Blast furnace slag flushing water and exhaust steam waste heat recovery cold and hot combined supply system Download PDFInfo
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- CN116294425A CN116294425A CN202310402130.7A CN202310402130A CN116294425A CN 116294425 A CN116294425 A CN 116294425A CN 202310402130 A CN202310402130 A CN 202310402130A CN 116294425 A CN116294425 A CN 116294425A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000002893 slag Substances 0.000 title claims abstract description 137
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 98
- 238000011084 recovery Methods 0.000 title claims abstract description 62
- 239000002918 waste heat Substances 0.000 title claims abstract description 56
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000005057 refrigeration Methods 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims description 25
- 238000001704 evaporation Methods 0.000 claims description 22
- 230000008020 evaporation Effects 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 18
- 238000004064 recycling Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000013589 supplement Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 30
- 239000002699 waste material Substances 0.000 description 10
- 239000013049 sediment Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
- F25D31/005—Combined cooling and heating devices
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/04—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot slag, hot residues, or heated blocks, e.g. iron blocks
-
- 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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/032—Separating slag from liquid, e.g. from water, after quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a blast furnace slag flushing water and exhaust steam waste heat recovery cold and hot combined supply system, which comprises a refrigeration heating module and a waste heat recovery module, wherein the heating module is connected with the waste heat recovery module, the waste heat recovery module comprises a slag flushing water recovery module, a slag flushing exhaust steam recovery module and a generation module, the slag flushing water recovery module is connected with the slag flushing exhaust steam module and the refrigeration heating module, the slag flushing exhaust steam module is connected with the generation module, the generation module realizes circulation through a liquid storage tank and is connected with the slag flushing exhaust steam module, and the circulation output of exhaust steam waste heat is realized; the slag water recovery module is used for realizing filtration of slag water and heat exchange of the slag water, the slag water heat exchanger is used for realizing heating of circulating water, blast furnace slag flushing exhaust steam generated in the slag water recovery module enters the slag flushing exhaust steam recovery module so as to realize recovery and storage of waste heat in the slag flushing exhaust steam, and secondary heating of the circulating water, high-quality output of the circulating water is realized, the external refrigeration and heating requirements are met, condensate water can be stored, the supplement of the circulating water is realized, and the utilization rate of a unit is improved.
Description
Technical Field
The invention relates to the technical field of waste heat utilization of blast furnace slag flushing water, in particular to a cold and hot combined supply system for recycling waste heat of blast furnace slag flushing water and exhaust steam.
Background
The blast furnace ironmaking can generate a large amount of high-temperature slag, the high-temperature slag carries huge waste heat, the water quenching method is often adopted to realize the cooling of the blast furnace slag so as to ensure the normal operation of a blast furnace system, the heat consumed by the method accounts for more than 15 percent of the total heat consumption of the blast furnace, and in the cooling process, the heat consumption mainly comprises evaporation of blast furnace slag flushing water and water vapor, so that the heat consumption is better utilized, the utilization rate of resources is improved, the slag flushing water is usually subjected to direct or indirect heat exchange, and the heating season is used for heating water so as to realize the waste heat recovery of the slag flushing water.
The publication number is: in the patent document of CN103173581B, a slag flushing water cooling tower with a cold water tank and a cooling tower pump slag flushing water system are connected in parallel with a heat exchange unit to realize the composite heat taking of the slag flushing water, so that the slag flushing water is recovered to the maximum extent for preheating, but the waste heat recovery of the heat in the water vapor is difficult to realize, and the waste heat cannot be recovered in a non-heating season;
the publication number is: in the patent document of CN213624212U, a flash tank is utilized, a low-pressure flash evaporation technology is adopted, the problems of pollution prevention, blockage and corrosion scaling caused by slag flushing water in the heat exchange process are avoided, the service life of equipment is prolonged, and meanwhile, the waste heat utilization of the slag flushing water in summer is realized by utilizing a steam type lithium bromide refrigerator, but the waste heat recovery of water vapor cannot be realized.
The publication number is: in the patent document of CN110375557A, the application of the waste heat of slag flushing water in winter and summer is solved by utilizing the characteristic that a heating pipe network covers thousands of households, but the waste heat recovery of water vapor still cannot be solved.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a cold and hot combined supply system for recycling slag flushing water and waste steam waste heat of a blast furnace.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the device comprises a refrigerating and heating module and a waste heat recovery module, wherein the refrigerating and heating module is connected with the waste heat recovery module;
the waste heat recovery module comprises a slag water recovery module, a slag flushing dead steam recovery module and a generation module;
the slag water recovery module is connected with the slag flushing exhaust steam recovery module and the refrigerating and heating module, and the slag flushing exhaust steam recovery module is connected with the generating module;
the generation module realizes circulation through the liquid storage tank;
and the generating module is connected with the slag flushing and waste steam module and used for circularly outputting waste steam and waste heat.
As a further description of the above technical solution: the slag water recovery module comprises a blast furnace slag flushing water tank, a filter and a slag water heat exchanger, wherein the blast furnace slag flushing water tank is sequentially connected with the filter and the slag water heat exchanger, the outlet end of the slag water heat exchanger is respectively connected with the blast furnace slag flushing water tank and the refrigerating and heating module, and the blast furnace slag flushing water tank is connected with the slag flushing exhaust steam recovery module.
As a further description of the above technical solution: the blast furnace slag flushing exhaust steam module comprises an absorption tower, a self-circulation heat exchanger and a first flash tank, blast furnace slag flushing exhaust steam discharged from a blast furnace slag flushing water tank enters the absorption tower to be in direct contact heat exchange with low-temperature solution, the low-temperature exhaust steam after heat is absorbed is discharged from the absorption tower, the recovered slag flushing exhaust steam heat is used for heating steam condensate through the self-circulation heat exchanger and then enters the first flash tank, and finally is sent to a refrigerating and heating module in a steam mode, and the high-temperature solution after heat exchange returns to the absorption tower to be circularly sprayed for heat exchange and is discharged to the generation module.
As a further description of the above technical solution: the generating module comprises a liquid storage tank, a second flash tank, an evaporator, a compressor and a condensate tank, wherein the liquid storage tank is connected with the absorption tower through the self-circulation heat exchanger and is used for circulating the high-temperature solution.
As a further description of the above technical solution: the liquid storage tank is connected with the second flash tank through the evaporator and is used for concentrating solution, the formed concentrated solution flows into the liquid storage tank, the compressor is connected with the second flash tank and the evaporator and is used for providing power for the external circulation of the generating module, and the evaporator condensate water formed by the evaporator enters the condensate tank and is stored, so that spray water is provided for the steam module and the compressor.
As a further description of the above technical solution: and the liquid generated in the first flash tank flows back to the self-circulation heat exchanger, and the generated exhaust steam reaches the flash exhaust steam heat exchanger through the steam storage tank to be connected with the refrigerating and heating module.
As a further description of the above technical solution: and the liquid formed by the flash evaporation exhaust steam heat exchanger and the liquid formed in the steam storage tank are connected in parallel and then input into the condensate heat exchanger, condensate backheating is realized through the condensate heat exchanger, and the condensate backheating is sent to the slag flushing exhaust steam waste heat recovery module.
As a further description of the above technical solution: the cooling and heating module comprises a flow dividing device, a refrigerating unit, a cooling tower and a cold and hot user, wherein the slag water heat exchanger is connected with the flow dividing device, and according to the actual demand of the cold and hot user, the direct supply of circulating water or the secondary heating of the flash evaporation exhaust steam heat exchanger is realized, the heated circulating water is directly fed into the heat user for heat supply, and when the refrigerating demand exists, the circulating water is fed into the refrigerating unit, so that the refrigerating demand of the user 19 is met.
As a further description of the above technical solution: the cooling tower is connected with the refrigerating unit independently, a user is connected with the refrigerating unit through a control system, and the flow dividing device is connected with the flash exhaust steam heat exchanger respectively so as to finish refrigeration or heating according to different requirements of the user.
The invention has the following beneficial effects:
according to the invention, through the waste heat recovery module, waste heat recovery of slag flushing water and slag flushing exhaust steam is realized, the utilization rate of heat generated during cooling of high-temperature slag is greatly improved, and the heat in generated vapor is also utilized, so that the problems of singleness and inefficiency of the existing blast furnace slag flushing waste heat recovery are effectively solved; meanwhile, the heat energy storage effect is achieved, the intermittent slag flushing characteristics of the blast furnace are effectively attached, the secondary heating of the cold source is achieved through the waste heat recovery module, the stability and the high-efficiency output of waste heat resources are guaranteed, and the continuous utilization of waste heat in winter and summer is achieved.
Drawings
Fig. 1 is a schematic diagram of a cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat.
Legend description:
1. a blast furnace slag flushing water tank; 2. a filter; 3. a slag water heat exchanger; 4. an absorption tower; 5. a liquid storage tank; 6. a second flash tank; 7. an evaporator; 8. a compressor; 9. a coagulation tank; 10. a first flash tank; 11. a self-circulating heat exchanger; 12. a condensate heat exchanger; 13. a steam storage tank; 14. a condensate storage tank; 15. flash evaporation exhaust steam heat exchanger; 16. a shunt device; 17. a refrigerating unit; 18. a cooling tower; 19. and (5) a user.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Referring to fig. 1, one embodiment provided by the present invention: the device comprises a refrigeration and heating module and a waste heat recovery module, wherein the refrigeration and heating module is connected with the waste heat recovery module, the waste heat recovery module comprises a slag water recovery module, a slag flushing exhaust steam module and a generation module, the slag water recovery module is connected with the slag flushing exhaust steam recovery module and the refrigeration and heating module, the slag flushing exhaust steam module is connected with the generation module, and the generation module realizes circulation through a liquid storage tank 5 to realize the circulation heat exchange of the slag flushing exhaust steam; through the sediment water recovery module, realize the filtration of towards sediment water and the heat transfer of sediment water, realize circulating water heating through sediment water heat exchanger 3, the blast furnace towards sediment exhaust steam that produces in the sediment water recovery module passes through towards sediment exhaust steam recovery module, the generation module, realize towards recovery and the storage of waste heat in the sediment exhaust steam, and the secondary heating circulating water, realize the high-quality output of circulating water, satisfy external refrigeration, heat demand, can store the comdenstion water simultaneously, realize the replenishment of circulating water simultaneously, the utilization ratio of unit has been promoted.
Regarding the refrigeration and heating processes:
the heating module comprises a flow dividing device 16, a refrigerating unit 17 and a cooling tower 18, wherein the slag water heat exchanger 3 is connected with the refrigerating unit 17 through the flow dividing device 16 and a flash evaporation exhaust steam heat exchanger 15, the cooling tower 18 is independently connected with the refrigerating unit 17, and a user 19 is respectively connected with the refrigerating unit 17, the flow dividing device 16 and the flash evaporation exhaust steam heat exchanger 15.
Regarding the heating mode:
under the condition that heating is needed in winter, circulating water is preheated to the temperature T by the slag-water heat exchanger 3 0 According to the actual heat load demand of the heat user 19, if the circulating water temperature T 0 The heat supply requirement of the user 19 can be met, the flow dividing device 16 is started, and the circulating water is directly sent to the heat user 19 for heating; if the temperature T of the circulating water 0 The heat supply requirement of the user 19 cannot be met, the circulating water subjected to heat exchange by the slag-water heat exchanger 3 enters the flash evaporation exhaust steam heat exchanger 15 to be heated to the temperature T1 again, so that stable and continuous output of a waste heat source is realized, and the problem of slag intermittence of the blast furnace is solved (the temperature T needs to be described 0 And the temperature T1 can be changed according to different areas or different requirements, so as to be more suitable for different use requirements).
Regarding the cooling mode:
under the condition that refrigeration is needed in summer, circulating water is preheated through the slag-water heat exchanger 3, then is secondarily heated to a higher temperature through the flash evaporation exhaust steam heat exchanger 15, is sent to the refrigerating unit 17 to serve as a driving heat source for heating neutral inorganic salt solution in the generator, solution concentration is achieved, evaporated low-pressure steam is condensed by cooling water in a condenser, the condensed water is sent to an evaporator of the refrigerating unit 17 to release pressure and evaporate heat for absorbing heat, cooling water is used for cooling, and then is sent to the cold user 19 for refrigeration, and the excess heat input by the refrigerating unit 17 is sent to the cooling tower 18 for heat dissipation through cooling water.
The system can simultaneously realize the comprehensive effect of refrigerating and heating, adjusts the operation mode according to the requirement of the user 19, can effectively prolong the operation time of the system, greatly reduces the limitation of the region characteristics on the waste heat recovery of the blast furnace slag flushing water, and thus improves the utilization rate of the unit.
Regarding the waste heat recovery flow of slag flushing water:
the slag water recovery module comprises a blast furnace slag flushing water tank 1, a filter 2 and a slag water heat exchanger 3, wherein the blast furnace slag flushing water tank 1 is sequentially connected with the filter 2 and the slag water heat exchanger 3, the outlet end of the slag water heat exchanger 3 is respectively connected with the blast furnace slag flushing water tank 1 and the heating module, and the blast furnace slag flushing water tank 1 is connected with the slag flushing exhaust steam recovery module;
the slag flushing water is led to the filter 2 from the blast furnace slag flushing water tank 1, particles such as slag cotton, water slag and the like generated in the slag flushing process are filtered, the filtered slag flushing water is sent to the slag water heat exchanger 3 to exchange heat with circulating water, the slag flushing water after heat exchange and cooling is sent back to the blast furnace slag flushing water tank 1, slag is continuously cooled by the blast furnace, and the slag flushing water after temperature rise is sent to the filter 2 and the slag water heat exchanger 3 to complete circulation.
Regarding the slag flushing exhaust steam recovery system:
the slag flushing exhaust steam module comprises an absorption tower 4, blast furnace slag flushing exhaust steam discharged from a blast furnace slag flushing water tank 1 enters the absorption tower 4, low-temperature exhaust steam after heat is absorbed is discharged from the absorption tower 4, the recovered slag flushing exhaust steam heat heats steam condensate through a self-circulation heat exchanger 11 and then enters a first flash tank 10, and finally is sent to the refrigerating and heating module in a steam mode, and the high-temperature solution after heat exchange returns to the absorption tower 4 to be circularly sprayed for heat exchange and is discharged to the generating module.
The waste steam of slag flushing water enters the absorption tower 4 and is in direct contact with a spray solution in the tower to transfer heat and mass, the water vapor in the waste steam is dissolved in the solution to release vaporization latent heat, finally the treated waste steam is discharged in an unsaturated state, a large amount of water vapor and partial particulate matters contained in the waste steam of slag flushing water are in direct contact with a strong hygroscopic solution in the absorption tower 4, so that moisture and particulate matters are absorbed, the visual white smoke of the discharged waste steam in the unsaturated state is weakened, the corrosion degree of a chimney by the waste steam is reduced, and the purification effect on the waste steam is realized.
Regarding the solution flow of the slag flushing exhaust steam:
solution external circulation:
the generating module comprises a liquid storage tank 5, a second flash tank 6, an evaporator 7, a compressor 8 and a condensation tank 9, wherein the liquid storage tank 5 is connected with the second flash tank 6 through the evaporator 7 for concentrating a solution, the formed concentrated solution flows into the liquid storage tank 5, the compressor 8 is connected with the second flash tank 6 and the evaporator 7 for pressurizing and upgrading steam discharged from the second flash tank 6, driving force is provided for external circulation of the generating module, and evaporation condensate formed by the evaporator 7 enters the condensation tank 9 for storage and spray water is provided for the steam module and the compressor 8;
the dilute solution in the liquid storage tank 5 is pumped into the evaporator 7, the vapor after pressurizing and upgrading by the compressor 8 is used as a driving heat source, the solution absorbs the heat of the driving vapor in the evaporator 7 and becomes a gas-liquid mixture, the gas-liquid mixture enters the second flash tank 6 to realize solution concentration, the concentrated solution after flash evaporation is collected into the liquid storage tank 5 from the bottom of the second flash tank 6, and the exhaust steam after flash evaporation is discharged from the top of the second flash tank 6.
Solution self-circulation:
the liquid storage tank 5 is connected with the absorption tower 4 through a self-circulation heat exchanger 11 and is used for circulating high-temperature solution;
the high-temperature solution after heat exchange with the exhaust steam of the slag flushing water falls into the bottom of the absorption tower 4 and then is converged into the liquid storage tank 5, then is sent to the self-circulation heat exchanger 11 for heat exchange, and enters the absorption tower 4 for spraying after releasing heat, and is in countercurrent contact with the flue gas, and then falls back to the bottom of the absorption tower to complete circulation.
Regarding the circulating water flow of the slag flushing exhaust steam:
the liquid formed by the flash evaporation exhaust steam heat exchanger 15 and the liquid formed in the steam storage tank 13 are connected in parallel and then input into the condensate heat exchanger 12, and the condensate heat exchanger 12 is connected with the generation module;
the circulating water is preheated by the slag-water heat exchanger 3, then is sent to the flash evaporation exhaust steam heat exchanger 15 for secondary heating, the circulating water after secondary heating is directly sent to the heat user 19 for heating in winter in two operation modes of winter and summer, and returns according to the original path after heat dissipation and temperature reduction; in summer, the circulating water is led into the refrigerating unit 17 as a driving heat source, and is returned according to the original path after being cooled (the control system and the pipeline for connecting the user 19 with the refrigerating unit 17, and respectively connecting the flow dividing device 16 and the flash exhaust steam heat exchanger 15 belong to the existing mature technology, and are not improved in the scheme, so that the description thereof is omitted.
Steam flow of slag flushing exhaust steam:
the steam module comprises a first flash tank 10, a steam storage tank 13, a flash exhaust steam heat exchanger 15, a condensate storage tank 14 and a condensate heat exchanger 12, wherein liquid generated in the first flash tank 10 flows back into the self-circulation heat exchanger 11, and the generated exhaust steam reaches the flash exhaust steam heat exchanger 15 through the steam storage tank 13 to be connected with the heating module;
the flash evaporation exhaust steam generated by the first flash evaporation tank 10 is firstly sent to a steam storage tank 13 for storage and energy storage, then sent to a flash evaporation exhaust steam heat exchanger 15 for heat exchange and condensation with circulating water, flash evaporation exhaust steam condensate is firstly converged into a condensate storage tank 14 and then sent to a condensate heat exchanger 12 for preheating, the preheated steam condensate is sent to a self-circulation heat exchanger 11 for secondary heating and then sent to the first flash evaporation tank 10, and the flash evaporation exhaust steam is sent to the steam storage tank 13 for circulation;
the flash exhaust steam generated by the second flash tank 6 is heated and boosted by the compressor 8, sprayed to a saturated state by a small amount of condensate water, changed into driving steam to enter the evaporator 7, transferred to the solution, cooled into condensate water, and the condensate water enters the condensate water tank 9;
through this system, the problem of the discontinuous slag discharge of blast furnace in waste heat recovery field, waste heat quality wave band output, utilize open absorption heat pump absorption blast furnace slag exhaust steam's waste heat, and store the heat of absorption with the form of steam, when the heat demand of user 19 can not be satisfied to front end towards sediment water waste heat, the exhaust steam heat of storage can carry out the secondary heating to the cold source, realize the effect of heat peak regulation, effectively guarantee system output thermal stability and high efficiency (it is to be noted, in this scheme, represent vapor or the flow direction of liquid through the arrow mark, in the drawing, omit the illustration of pipeline and partial valve, simultaneously, 5 departments at the liquid reserve tank are provided with the water pump and provide power for the flow of liquid, because of the pipeline, valve and open absorption heat pump are current mature technique, consequently no longer carry out the description to it).
Finally, it should be noted that: the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, it will be apparent to those skilled in the art that the foregoing description of the preferred embodiments of the present invention can be modified or equivalents can be substituted for some of the features thereof, and any modification, equivalent substitution, improvement or the like that is within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A cold and hot combined supply system for blast furnace slag flushing water and exhaust steam waste heat recovery is characterized in that: the device comprises a refrigerating and heating module and a waste heat recovery module, wherein the refrigerating and heating module is connected with the waste heat recovery module;
the waste heat recovery module comprises a slag water recovery module, a slag flushing dead steam recovery module and a generation module;
the slag water recovery module is connected with the slag flushing exhaust steam recovery module and the refrigerating and heating module, and the slag flushing exhaust steam recovery module is connected with the generating module;
the generation module realizes circulation through the liquid storage tank;
the generation module is connected with the slag flushing exhaust steam recovery module, the concentration of the system solution is kept constant, and the circulating output of exhaust steam waste heat is realized through the direct contact heat exchange between the circulating solution and the slag flushing exhaust steam.
2. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 1, which is characterized in that: the slag water recovery module comprises a blast furnace slag flushing water tank, a filter and a slag water heat exchanger, wherein the blast furnace slag flushing water tank is sequentially connected with the filter and the slag water heat exchanger, the outlet end of the slag water heat exchanger is respectively connected with the blast furnace slag flushing water tank and the refrigerating and heating module, and the blast furnace slag flushing water tank is connected with the slag flushing exhaust steam recovery module.
3. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 2, which is characterized in that: the slag flushing exhaust steam recovery module comprises an absorption tower, a self-circulation heat exchanger, a first flash tank and a condensate heat exchanger, blast furnace slag flushing exhaust steam discharged from a blast furnace slag flushing water tank enters the absorption tower to be in direct contact with low-temperature solution for heat exchange, the low-temperature exhaust steam after heat is absorbed is discharged from the absorption tower discharge system, the recovered slag flushing exhaust steam heat heats steam condensate through the self-circulation heat exchanger, then enters the first flash tank, finally is sent to the refrigerating and heating module in a steam mode, and the high-temperature solution after heat exchange returns to the absorption tower for circulating spray heat exchange.
4. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 3, wherein the cold and hot combined supply system is characterized in that: the generating module comprises a liquid storage tank, a second flash tank, an evaporator, a compressor and a condensate tank, wherein the liquid storage tank is connected with the absorption tower through the self-circulation heat exchanger and is used for circulating the high-temperature solution.
5. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 4, wherein the cold and hot combined supply system is characterized in that: the liquid storage tank is connected with the second flash tank through the evaporator and is used for concentrating a solution, concentrated solution after concentration is converged into the liquid storage tank, the compressor is connected with the second flash tank and the evaporator and is used for pressurizing and upgrading steam discharged from the second flash tank and providing driving force for external circulation of the generating module, and evaporator condensate formed by the evaporator enters the condensate tank and is stored for the steam module and the compressor to provide spray water.
6. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 3, wherein the cold and hot combined supply system is characterized in that: and the liquid generated in the first flash tank flows back to the self-circulation heat exchanger, and the generated exhaust steam reaches the flash exhaust steam heat exchanger through the steam storage tank to be connected with the refrigerating and heating module.
7. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 3, wherein the cold and hot combined supply system is characterized in that: and the liquid formed by the flash evaporation exhaust steam heat exchanger and the liquid formed in the steam storage tank are connected in parallel and then input into the condensate heat exchanger, condensate backheating is realized through the condensate heat exchanger, and the condensate backheating is connected into the blast furnace slag flushing exhaust steam waste heat recovery module.
8. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 3, wherein the cold and hot combined supply system is characterized in that: the cooling and heating module comprises a flow dividing device, a refrigerating unit, a cooling tower and a cold and hot user, wherein the slag water heat exchanger is connected with the flow dividing device, and according to the actual demand of the cold and hot user, the direct supply of circulating water or the secondary heating of the flash evaporation exhaust steam heat exchanger is realized, the heated circulating water is directly fed into the heat user for heat supply, and when the refrigerating demand exists, the circulating water is fed into the refrigerating unit, so that the refrigerating demand of the user is met.
9. The cold and hot combined supply system for recycling blast furnace slag flushing water and exhaust steam waste heat according to claim 8, wherein the cold and hot combined supply system is characterized in that: the cooling tower is connected with the refrigerating unit independently, a user is connected with the refrigerating unit through a control system, and the flow dividing device is connected with the flash exhaust steam heat exchanger respectively so as to finish refrigeration or heating according to different requirements of the user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310402130.7A CN116294425A (en) | 2023-04-14 | 2023-04-14 | Blast furnace slag flushing water and exhaust steam waste heat recovery cold and hot combined supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310402130.7A CN116294425A (en) | 2023-04-14 | 2023-04-14 | Blast furnace slag flushing water and exhaust steam waste heat recovery cold and hot combined supply system |
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| Publication Number | Publication Date |
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| CN116294425A true CN116294425A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310402130.7A Pending CN116294425A (en) | 2023-04-14 | 2023-04-14 | Blast furnace slag flushing water and exhaust steam waste heat recovery cold and hot combined supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116972652A (en) * | 2023-07-28 | 2023-10-31 | 昊姆（上海）节能科技有限公司 | Waste heat recovery system for slag flushing water and slag flushing exhaust steam of blast furnace and operation mode thereof |
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2023
- 2023-04-14 CN CN202310402130.7A patent/CN116294425A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116972652A (en) * | 2023-07-28 | 2023-10-31 | 昊姆（上海）节能科技有限公司 | Waste heat recovery system for slag flushing water and slag flushing exhaust steam of blast furnace and operation mode thereof |
| CN116972652B (en) * | 2023-07-28 | 2024-03-22 | 昊姆（上海）节能科技有限公司 | Waste heat recovery system for slag flushing water and slag flushing exhaust steam of blast furnace and operation mode thereof |
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