CN211739268U - Heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation - Google Patents
Heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation Download PDFInfo
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- CN211739268U CN211739268U CN201922314281.9U CN201922314281U CN211739268U CN 211739268 U CN211739268 U CN 211739268U CN 201922314281 U CN201922314281 U CN 201922314281U CN 211739268 U CN211739268 U CN 211739268U
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Abstract
The utility model relates to a steel, coking trade dry quenching technique, especially heat pump coupling waste heat heating system based on the subcritical ultra-temperature power generation of dry quenching, characterized by: at least comprises the following steps: a dry quenching gas circulation unit, a dry quenching boiler steam-water unit and an absorption heat pump heating unit; the dry quenching gas circulation unit, the dry quenching boiler steam-water unit and the absorption heat pump heating unit are connected through a pipeline valve; the dry quenching gas circulation unit at least comprises: a dry quenching boiler, a primary dust remover, a secondary dust remover, a circulating fan and an auxiliary economizer. The heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation has the advantages of good safety, small maintenance amount and long service life, and can be used for improving the energy utilization efficiency of a dry quenching waste heat system.
Description
Technical Field
The utility model relates to a dry quenching technology of steel and iron, coking industry, especially heat pump coupling waste heat heating system based on the subcritical ultra-temperature power generation of dry quenching.
Background
The steel and iron and coking industries are taken as key industries of resource consumption and pollution emission, and are always key focus objects for the national implementation of environmental protection and energy conservation and emission reduction policies. The dry quenching technology is an important technical measure for iron and steel and coking enterprises to realize energy conservation, emission reduction and environmental protection, and how to further improve the energy efficiency of the dry quenching technology becomes one of the technical hotspots of energy conservation and environmental protection.
The dry quenching waste heat power generation refers to a process system which adopts a dry quenching boiler to absorb heat of inert circulating gas of a dry quenching system to generate steam, and then the steam enters a steam turbine to convert the heat energy into kinetic energy so as to drag a generator to generate electric energy. The dry quenching waste heat power generation technology converts the sensible heat of the recovered red coke into electric energy, can limit and reduce the power consumption of coking and steel enterprises, reduces the atmospheric pollution and brings great economic benefit.
In a dry quenching waste heat power generation system, subcritical ultrahigh temperature (steam pressure is 17.6MPa, steam temperature is 571 ℃) generated by a dry quenching boiler is used for power generation, and the system is matched with a subcritical ultrahigh temperature steam turbine generator unit. When the steam turbine selects a steam extraction condensing steam type or a straight condensing steam turbine generator set, the circulating cooling water takes away the waste steam heat of the condenser and dissipates through the cooling tower, so that great cold source loss is caused. For reducing the cold source loss, improve energy utilization, realize factory or resident user's heating demand, the mode that currently often adopts: low vacuum circulating water heating technology. The disadvantages of this technique are: (1) the generating efficiency of the steam turbine is influenced under the working condition of high back pressure of the steam turbine, and the generating capacity is directly influenced by the heat supply amount; (2) after the exhaust pressure of the steam turbine is improved, a condenser needs to be reinforced; the change of the steam exhaust working condition may affect the safety of the unit, and the unit has large maintenance amount and short service life.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation is provided with good safety, small maintenance amount and long service life to improve the energy utilization efficiency of a dry quenching waste heat system.
The utility model aims at realizing like this, based on the heat pump coupling waste heat heating system of the subcritical ultra-temperature electricity generation of dry quenching, characterized by: at least comprises the following steps: a dry quenching gas circulation unit, a dry quenching boiler steam-water unit and an absorption heat pump heating unit; the dry quenching gas circulation unit, the dry quenching boiler steam-water unit and the absorption heat pump heating unit are connected through a pipeline valve; the dry quenching gas circulation unit at least comprises: the system comprises a dry quenching boiler, a primary dust remover, a secondary dust remover, a circulating fan and an auxiliary economizer, wherein 900-980 ℃ circulating gas discharged from an annular flue of the dry quenching boiler is input and connected to the inlet end of the primary dust remover through an input end circulating gas pipeline, enters the input end of the dry quenching boiler through the output end of the primary dust remover, is output from the bottom of the dry quenching boiler, is conveyed to the input port of the secondary dust remover through an output end circulating gas pipeline, is connected with the auxiliary economizer through the output end of the secondary dust remover through the circulating fan, is pressurized by the circulating fan and enters the auxiliary economizer, exchanges heat with low-temperature feed water of the boiler in the auxiliary economizer to be continuously cooled to 130 ℃, and is connected to the bottom of the dry quenching boiler through a pipeline for recycling.
The dry quenching gas circulation unit at least comprises: the system comprises a dry quenching boiler, a primary dust remover, a secondary dust remover and an auxiliary coal economizer, wherein 900-980 ℃ circulating gas discharged from an annular flue of the dry quenching boiler is input into the primary dust remover through a circulating gas pipeline at an input end, coarse coke powder is removed through gravity settling after primary dust removal of the primary dust remover, the gas enters the dry quenching boiler through an output end of the primary dust remover, and the gas exchanges heat with the dry quenching boiler to reduce the temperature to about 180 ℃; the relatively cold circulating gas output from the bottom of the dry quenching boiler is conveyed to a secondary dust remover through a circulating gas pipeline at an output end, and is further subjected to dust removal with smaller particle size through the secondary dust remover, then the relatively cold circulating gas is pressurized by a circulating fan and enters an auxiliary economizer, and the relatively cold circulating gas exchanges heat with low-temperature feed water of the boiler in the auxiliary economizer to be continuously cooled to 130 ℃, and then is conveyed into the dry quenching boiler for recycling.
The dry quenching boiler steam-water unit comprises: the system comprises a condenser, a condensate pump, a desalted water tank, an auxiliary economizer, a deaerator and a boiler feed water pump, wherein a steam turbine is connected with the condenser through an exhaust steam pipeline, after exhaust steam of the condenser exchanges heat with circulating cooling water, the condensate water of the condenser is sent to an input port of the desalted water tank through the condensate pump and a condensate water pipeline, and the desalted water tank is provided with at least two input ports and an output port; an output port of the demineralized water tank is connected to the auxiliary economizer through a deaerator water feed pump and an auxiliary economizer water feed pipeline, the demineralized water tank is preheated and heated by the auxiliary economizer and then enters the deaerator through a deaerator water feed pipeline, the deaerator is connected with a boiler water feed pump through a boiler water feed pipeline, the demineralized water tank enters the dry quenching boiler again after being pressurized by the boiler water feed pump, subcritical ultrahigh-temperature steam with the pressure of 17.6MPa and the temperature of 571 ℃ is generated after exchanging heat with circulating flue gas through heat exchangers at all stages in the dry quenching boiler, the subcritical ultrahigh-temperature steam enters a steam turbine, and the steam turbine drives a generator to generate electricity.
The heating unit of the absorption heat pump at least comprises: the system comprises an absorption heat pump unit, a heating user, a heat supply network water circulating pump, a circulating cooling water pump, a cooling tower and a circulating cooling water switching valve, wherein a factory steam collecting pipe valve is divided into two paths, one path is directly connected with a deaerator through a low-pressure steam pipeline and deaerates through the deaerator, the other path enters a first path of heat absorption group of the absorption heat pump unit, and after heat absorption of the absorption heat pump unit, the other path enters the deaerator for deaerating through the absorption heat pump unit; the second path of heat absorption set of the absorption heat pump unit is connected with a pipeline valve of a condenser, exchanges heat with circulating cooling water through exhaust steam of the condenser, and is connected to a cooling tower through two groups of circulating cooling water switching valves; the output end of the absorption heat pump unit is connected with a heating user through a heat supply network water circulating pump to provide a heat source for the heating user.
The absorption heat pump unit comprises a generator, an evaporator, a condenser, an absorber and the like of the lithium bromide absorption heat pump unit.
The lithium bromide absorption heat pump unit generator is provided with an inlet for heating and concentrating a lithium bromide solution, and is connected with a heating and concentrating lithium bromide solution pipeline through the inlet.
The advantages of the utility model
The utility model discloses a dry quenching subcritical ultra-high temperature power generation system and absorption heat pump coupling waste heat heating system get into heating period in winter, switch the recirculated cooling water valve to absorption heat pump unit circulation circuit, realize the central heating demand to factory or residential architecture. Compared with the prior art, the utility model has the advantages as follows:
(1) in the heating period in winter, the dry quenching subcritical ultra-high temperature waste heat power generation system and the absorption heat pump unit are in coupled operation, SO that the dual utilization of power generation and low-temperature waste heat is realized, the comprehensive energy utilization rate of the system is greatly improved, the coal consumption is saved, and the SO is reducedxAnd NOxThe discharge amount of the coke dry quenching furnace has obvious energy-saving and environment-friendly benefits, and double economic benefits of dry quenching power generation and centralized heating are realized.
(2) The absorption heat pump unit has the heating coefficient more than 1.6, has the characteristics of low power consumption and small environmental pollution, can fully utilize low-pressure steam of steel and coking enterprises to obtain more heat, supplies heat for plant areas or residential users, and improves the thermal efficiency of a dry quenching system.
(3) In order to ensure the heating requirement in the severe cold period, a peak steam-water heat exchanger can be additionally arranged on the system and used as a peak regulation heat source for heating in the severe cold period.
Drawings
Fig. 1 is a schematic diagram of the embodiment of the present invention.
In the attached figure 1: 1. dry quenching; 2. a primary dust remover; 3. a dry quenching boiler; 4. a steam turbine, 5, a generator; 6. a condenser; 7. an absorption heat pump unit; 8. a heating user; 9. a heat supply network water circulating pump; 10. a circulating cooling water pump; 11. a cooling tower; 12. a circulating cooling water switching valve; 13. a condensate pump; 14. a demineralized water tank; 15. a boiler feed pump; 16. A deaerator; 17. a secondary dust remover; 18. a circulating fan; 19. a secondary economizer; 20. 21, a circulating gas pipeline, a waste steam pipeline; 22. A condensate line; 23. a water supply pipeline of the auxiliary economizer; 24. a deaerator water inlet pipeline; 25. a boiler feed water line; 26. a heat pump condensate line; 27. a low pressure steam line; 28. a circulating cooling water pipeline; 29. a heat supply network water line; 30. a steam collecting pipe valve of a manufacturer; 31. a water pump of the deaerator.
Detailed Description
As shown in figure 1, the heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation is characterized in that: at least comprises the following steps: a coke dry quenching gas circulation unit, a coke dry quenching boiler unit and an absorption heat pump heating unit, wherein the coke dry quenching gas circulation unit comprises a coke dry quenching furnace 1, a primary dust remover 2, a coke dry quenching boiler 3, a steam turbine 4, a generator 5, a condenser 6, an absorption heat pump unit 7, a heating user 8, a heat supply network water circulation pump 9, a circulating cooling water pump 10, a cooling tower 11, a circulating cooling water switching valve 12, a condensed water pump 13, a desalted water tank 14, a boiler water feed pump 15, a deaerator 16, a secondary dust remover 17, a circulating fan 18, a secondary economizer 19, a circulating gas pipeline 20, a dead steam pipeline 21, a condensed water pipeline 22, a secondary economizer water feed pipeline 23, a deaerator water inlet pipeline 24, a boiler water feed pipeline 25, a heat pump condensed water pipeline 26, a low-pressure steam pipeline 27, a circulating cooling water pipeline 28, a heat supply network water pipeline 29, a factory steam collecting pipe valve 30 and a deaerator water;
wherein, (1) the dry quenching gas circulation unit at least comprises: the system comprises a dry quenching boiler 3, a primary dust remover 2, a secondary dust remover 17 and an auxiliary coal economizer 19, wherein 900-980 ℃ circulating gas discharged from an annular flue of the dry quenching boiler is input into the primary dust remover 2 through an input end circulating gas pipeline 20, coarse coke powder is removed through gravity settling after primary dust removal of the primary dust remover 2, the gas enters the dry quenching boiler 3 through an output end of the primary dust remover 2, and the gas exchanges heat with the dry quenching boiler 3 to reduce the temperature to about 180 ℃. The relatively cool circulating gas output from the bottom of the dry quenching boiler 3 is sent to a secondary dust remover 17 through a circulating gas pipeline 20 at the output end, and then is further removed with dust with smaller particle size through the secondary dust remover 17, and then is pressurized by a circulating fan 18 to enter an auxiliary economizer 19, and is continuously cooled to 130 ℃ in the auxiliary economizer 19 through heat exchange with low-temperature feed water of the boiler, and then is sent into the dry quenching furnace 1 for recycling.
(2) Steam-water unit of dry quenching boiler
The method comprises the following steps: the system comprises a condenser 6, a condensate pump 13, a desalted water tank 14, an auxiliary economizer 19, a deaerator 16 and a boiler feed water pump 15, wherein a steam turbine 4 is connected with the condenser 6 through a waste steam pipeline 21, after waste steam of the condenser 6 exchanges heat with circulating cooling water, the condensate water is sent to an input port of the desalted water tank 14 through the condensate pump 13 through a condensate pipeline 22, and the desalted water tank 14 is provided with at least two input ports and one output port; an output port of the desalted water tank 14 is connected to an auxiliary economizer 19 through a deaerator water feed pump 31 and an auxiliary economizer water feed pipeline 23 through pipelines, the desalted water tank is preheated by the auxiliary economizer 19 and then enters a deaerator 16 through a deaerator water feed pipeline 24, the deaerator 16 is connected with a boiler water feed pump 15 through a boiler water feed pipeline 25, the desalted water tank is pressurized by the boiler water feed pump 15 and then enters the dry quenching boiler 3 again, after heat exchange is carried out between each stage of heat exchanger in the dry quenching boiler 3 and circulating flue gas, subcritical ultrahigh-temperature steam with the pressure of 17.6MPa and the temperature of 571 ℃ is generated, the subcritical ultrahigh-temperature steam enters a steam turbine 4, and the steam turbine 4 drives a generator 5 to generate electricity.
(3) Absorption heat pump heating unit
At least comprises the following steps: the system comprises an absorption heat pump unit 7, a heating user 8, a heat supply network water circulating pump 9, a circulating cooling water pump 10, a cooling tower 11 and a circulating cooling water switching valve 12, wherein a factory steam collecting pipe valve 30 is divided into two paths, one path is directly connected with a deaerator 16 through a low-pressure steam pipeline 27, deaerates through the deaerator 16, the other path enters a first path of heat absorption group of the absorption heat pump unit 7, and deaerates after being subjected to heat absorption by the absorption heat pump unit 7 and entering the deaerator 16 through the absorption heat pump unit 7; the second path of heat absorption set of the absorption heat pump unit 7 is connected with a pipeline valve of the condenser 6, exchanges heat with circulating cooling water through exhaust steam of the condenser 6, and is connected to the cooling tower 11 through two groups of circulating cooling water switching valves 12; the output end of the absorption heat pump unit 7 is connected with a heating user 8 through a heat supply network water circulating pump 9, and a heat source is provided for the heating user 8.
The absorption heat pump unit 7 includes a generator, an evaporator, a condenser, an absorber, etc. of the lithium bromide absorption heat pump unit.
The generator of the lithium bromide absorption heat pump unit is provided with an inlet for heating and concentrating the lithium bromide solution, and the generator of the lithium bromide absorption heat pump unit is connected with a pipeline for heating and concentrating the lithium bromide solution through the inlet.
The utility model discloses in, 4 exhaust steam waste heat of steam turbine discharges through the cooling tower after the cooling water heat transfer, has wasted a large amount of waste heat. Under the working condition of operation in winter, the temperature of cooling water heated by the condenser 6 is increased from 22-23 ℃ to 32-33 ℃, after a lithium bromide absorption heat pump unit is additionally arranged, circulating cooling water at 32-33 ℃ is used as a low-temperature heat source of the unit, low-pressure saturated steam at 0.6-0.8 MPa in a plant area is used as a driving heat source of the unit, water return of a heat supply network is heated from 55 ℃ to 75 ℃, heating is carried out on the plant area or residents, and the circulating cooling water cooled to 23 ℃ by the unit returns to the condenser 6 to complete the whole circulation.
The utility model discloses a working process is: in the heating unit of the absorption heat pump, low-pressure saturated steam of 0.6-0.8 MPa in an industrial plant area is used as a driving heat source to enter a lithium bromide absorption heat pump unit generator, the lithium bromide absorption heat pump unit generator heats and concentrates a lithium bromide solution, heat is transferred to the lithium bromide solution, and condensed water after heat exchange of the lithium bromide absorption heat pump unit generator returns to a deaerator 16; meanwhile, the circulating cooling water at the temperature of 32-33 ℃ after being heated by the condenser enters an evaporator of the absorption heat pump unit 7 to be used as a low-temperature heat source, and is cooled to the temperature of 22-23 ℃ in the evaporator and then returns to the condenser 6 to complete circulation of the circulating cooling water; the backwater of the heat supply network water at the temperature of 55 ℃ is heated to 80 ℃ after absorbing heat by an absorber and a condenser of the lithium bromide absorption heat pump unit in sequence, and then the backwater is sent to a factory or resident heating user 8 to complete the water circulation of the heat supply network.
The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (5)
1. Heat pump coupling waste heat heating system based on dry quenching subcritical ultra-temperature power generation, characterized by: at least comprises the following steps: a dry quenching gas circulation unit, a dry quenching boiler steam-water unit and an absorption heat pump heating unit; the dry quenching gas circulation unit, the dry quenching boiler steam-water unit and the absorption heat pump heating unit are connected through a pipeline valve; the dry quenching gas circulation unit at least comprises: the system comprises a dry quenching boiler (3), a primary dust remover (2), a secondary dust remover (17), a circulating fan (18) and an auxiliary economizer (19), wherein 900-980 ℃ circulating gas discharged from an annular flue of the dry quenching boiler is input and connected to the inlet end of the primary dust remover (2) through an input end circulating gas pipeline (20), enters the input end of the dry quenching boiler (3) through the output end of the primary dust remover (2), cooler circulating gas output from the bottom of the dry quenching boiler (3) enters the input port of the secondary dust remover (17) through an output end circulating gas pipeline (20), is connected with the auxiliary economizer (19) through the circulating fan (18) through the output end of the secondary dust remover (17), and is pressurized to enter the auxiliary economizer (19) through the circulating fan (18), the temperature of the secondary economizer (19) is continuously reduced to 130 ℃ through heat exchange with low-temperature feed water of the boiler, and the secondary economizer is connected to the bottom of the dry quenching furnace (1) through a pipeline for internal recycling.
2. The heat pump coupling waste heat heating device based on dry quenching subcritical ultrahigh temperature power generation of claim 1, which is characterized in that: the dry quenching boiler steam-water unit comprises: the system comprises a condenser (6), a condensate pump (13), a desalted water tank (14), an auxiliary economizer (19), a deaerator (16) and a boiler feed water pump (15), wherein a steam turbine (4) is connected with the condenser (6) through an exhaust steam pipeline (21), after heat exchange is carried out between exhaust steam of the condenser (6) and circulating cooling water, condensate of the condensate is sent to an input port of the desalted water tank (14) through the condensate pump (13) and a condensate pipeline (22), and the desalted water tank (14) is provided with at least two input ports and one output port; an output port of the desalted water tank (14) is connected to an auxiliary economizer (19) through a deaerator water feeding pump (31) and an auxiliary economizer water feeding pipeline (23) in a pipeline mode, the desalted water tank is preheated and heated through the auxiliary economizer (19), the desalted water tank enters a deaerator (16) through a deaerator water feeding pipeline (24), the deaerator (16) is connected with a boiler water feeding pump (15) through a boiler water feeding pipeline (25), the deaerator is pressurized through the boiler water feeding pump (15) and then enters the dry quenching boiler (3), subcritical ultrahigh-temperature steam with the pressure of 17.6MPa and the temperature of 571 ℃ is generated after heat exchange between each stage of heat exchangers in the dry quenching boiler (3) and circulating flue gas, the subcritical ultrahigh-temperature steam enters a steam turbine (4), and the steam turbine (4) drives a generator (5) to generate electricity.
3. The heat pump coupling waste heat heating device based on dry quenching subcritical ultrahigh temperature power generation of claim 1, which is characterized in that: the heating unit of the absorption heat pump at least comprises: the system comprises an absorption heat pump unit (7), a heating user (8), a heat supply network water circulating pump (9), a circulating cooling water pump (10), a cooling tower (11) and a circulating cooling water switching valve (12), wherein a factory steam collecting pipe valve (30) is divided into two paths, one path is directly connected with a deaerator (16) through a low-pressure steam pipeline (27), deaerates through the deaerator (16), the other path enters a first path of heat absorption group of the absorption heat pump unit (7), and deaerates after the absorption heat pump unit (7) enters the deaerator (16); the second path of heat absorption set of the absorption heat pump unit (7) is connected with a pipeline valve of the condenser (6), exchanges heat with circulating cooling water through exhaust steam of the condenser (6), and is connected with the cooling tower (11) in parallel through two groups of circulating cooling water switching valves (12); the output end of the absorption heat pump unit (7) is connected with a heating user (8) through a heat supply network water circulating pump (9) to provide a heat source for the heating user (8).
4. The heat pump coupling waste heat heating device based on dry quenching subcritical ultrahigh temperature power generation of claim 3, which is characterized in that: the absorption heat pump unit (7) comprises a generator, an evaporator, a condenser, an absorber and the like of the lithium bromide absorption heat pump unit.
5. The heat pump coupling waste heat heating device based on dry quenching subcritical ultrahigh temperature power generation of claim 4, which is characterized in that: the lithium bromide absorption heat pump unit generator is provided with an inlet for heating and concentrating a lithium bromide solution, and is connected with a heating and concentrating lithium bromide solution pipeline through the inlet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922314281.9U CN211739268U (en) | 2019-12-20 | 2019-12-20 | Heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation |
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| CN201922314281.9U CN211739268U (en) | 2019-12-20 | 2019-12-20 | Heat pump coupling waste heat heating device based on dry quenching subcritical ultra-high temperature power generation |
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