CN219366122U - Waste heat recovery system of power plant - Google Patents
Waste heat recovery system of power plant Download PDFInfo
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- CN219366122U CN219366122U CN202223469606.9U CN202223469606U CN219366122U CN 219366122 U CN219366122 U CN 219366122U CN 202223469606 U CN202223469606 U CN 202223469606U CN 219366122 U CN219366122 U CN 219366122U
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Abstract
The utility model provides a power plant waste heat recovery system, which comprises a flue gas recovery device, wherein the flue gas recovery device is connected with heating equipment, the heating equipment is connected with a flooding recovery device, the flooding recovery device comprises a steam turbine, a low-pressure cylinder and a medium-pressure cylinder, the medium-pressure cylinder is connected with a heating network heater, and the heating network heater is connected with the heating equipment; the steam turbine is connected with the condenser, the condenser is connected with the cooling tower, a circulating water supply pipeline and a circulating water return pipeline are arranged between the cooling tower and the condenser, the circulating water supply pipeline is connected with the flue gas recovery device, and the condenser is also connected with a condensed water recovery system; the method can recycle the waste heat of the steam turbine and the waste heat of the flue gas, can reduce the heat loss of the cold end of the steam turbine to zero, and uses the waste heat for heat supply; the waste heat of the recycled slurry can increase the heat supply capacity during the deep adjustment of the unit, the discharge of the atmospheric soluble salt is reduced after the exhaust gas temperature is reduced, the atmospheric quality is improved, and the discharge of pollutants such as smoke dust is further reduced.
Description
Technical Field
The application relates to the field of power plant waste heat recovery, in particular to a power plant waste heat recovery system.
Background
In a power plant, high-pressure steam of a boiler generates power through a steam turbine, and the steam exhausted by the steam turbine is called waste heat, so that the pressure is high, the temperature is high, and the application range is wide; the exhaust steam is the main waste heat of the power plant, and the other exhaust steam is only a few percent, such as flue gas, most of the exhaust steam in the prior art is utilized, the utilization rate of the flue gas is lower, in the actual production process, the flue gas generated by the combustion and power generation of the power plant contains a large amount of sulfur dioxide, the flue gas is sprayed to remove the sulfur dioxide generally by a limestone/gypsum wet flue gas desulfurization method, the temperature of the flue gas obtained by the process still has a low temperature condition of 55-60 ℃, the part of waste heat is discharged along with a chimney, and part of tail plume phenomenon is often generated, so that heat is wasted; in the prior art, a system for fully recovering the waste heat of a power plant is not available, the applicant performs detailed search on the prior art before writing, and the closest prior art is searched as follows:
prior art 1: a low-temperature waste heat recovery device for a power plant for low-pressure heating and steam extraction, with the application number of 201420453944. X; the high-temperature high-pressure steam pipe is connected with the extraction condensing turbine, the extraction condensing turbine is connected with the pressure matcher through the industrial steam extraction pipeline, the extraction condensing turbine is respectively connected with the steam-water heat exchanger and the pressure matcher through the heating steam extraction pipeline, the pressure matcher is connected with the absorption heat pump through the pipeline, the absorption heat pump is connected with the steam-water heat exchanger through the primary network supply return pipe, and the absorption heat pump is connected with the condenser through the circulating pipe. The utility model can efficiently recycle the low-temperature waste heat of the power plant, and is particularly suitable for the condition of insufficient heating and steam extraction pressure of the power plant; the application utilizes exhaust steam, has a complex structure, does not form a circulating system, and is not the same as the application in that the application utilizes the waste heat of a power plant.
In summary, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
The utility model provides a power plant waste heat recovery system, which comprises a flue gas recovery device, wherein the flue gas recovery device is connected with heating equipment, the heating equipment is also connected with a flooding recovery device, the flooding recovery device comprises a low-pressure cylinder and a medium-pressure cylinder which are connected with a steam turbine, the medium-pressure cylinder is connected with a heat supply network heater, a heat supply network water supply pipeline and a heat supply network water return pipeline are arranged between the heat supply network heater and the heating equipment, the heat supply network water return pipeline is connected with the flue gas recovery device, and a steam drainage pipeline is arranged on the heat supply network heater; the steam turbine is connected with the condenser, the condenser is connected with the cooling tower, a circulating water supply pipeline and a circulating water return pipeline are arranged between the cooling tower and the condenser, and the circulating water supply pipeline is connected with the flue gas recovery device through a waste heat water supply pipeline and a waste heat water return pipeline, wherein the condenser is also connected with a condensation water recovery system.
As a preferable scheme, the flue gas recovery device comprises a desulfurization slurry cooling system, wherein the desulfurization slurry cooling system is connected with a heat pump through a first circulating water pipeline and a second circulating water pipeline, the heat pump is connected with a waste heat water supply pipeline and a waste heat water return pipeline through a first pipeline and a second pipeline; and the heat pump is connected with a first steam drain pipeline.
As a preferable scheme, a water inlet pipeline is arranged between the heat supply network water supply pipeline and the heat supply network water return pipeline, and a switch valve is arranged on the water inlet pipeline.
As a preferred solution, the heat pump is also connected via a line three to a line between the medium pressure cylinder and the heating network heater.
As a preferable scheme, the steam turbine comprises a first steam turbine and a second steam turbine, wherein the first steam turbine is connected with a first low-pressure cylinder and a first medium-pressure cylinder, the first medium-pressure cylinder is connected with a first heat supply network heater, the first heat supply network heater is connected with a second heat supply network heater through a first circulating pipeline and a second circulating pipeline, the second heat supply network heater is connected with the second medium-pressure cylinder, the second medium-pressure cylinder is connected with the second low-pressure cylinder, and the second steam turbine is connected with the condenser; and the first heat supply network heater and the second heat supply network heater are both connected with a steam drainage pipeline.
As a preferable scheme, a one-way pipe I is arranged between the heat supply network water supply pipeline and the heat supply network water return pipeline, and a valve I is arranged on the one-way pipe I.
As a preferable scheme, a one-way pipe II is arranged between the first circulating pipeline and the second circulating pipeline, and a valve II is arranged on the one-way pipe II.
The high-temperature and high-pressure steam generated in the boiler enters the first steam turbine and the second steam turbine to do work, the low-temperature exhaust steam after the second steam turbine does work enters the condenser to condense into water, then enters the cooling tower through the circulating water supply pipeline, the cooling tower cools the water, the cooled water is fed into the condenser through the circulating water return pipeline, and the condenser returns the cooled water to the boiler through the condensed water recovery system to be heated again; the water flow in the circulating water supply pipeline has a certain temperature, enters the heat supply network water return pipeline through the residual water supply pipeline, then is heated through the first heat supply network heater and/or the second heat supply network heater, circulates hot water to heating equipment, and can directly enter the heat supply network water supply pipeline through the one-way pipe when the temperature reaches the requirement; non-condensable gases such as steam condensate water and air in the first heat supply network heater and the second heat supply network heater are discharged through a steam drainage pipeline; the gas phase in the desulfurizing tower is cooled by a desulfurizing slurry cooling system to form liquid, the liquid has a certain temperature, the liquid enters a heat pump through a circulating water return pipeline to perform heat exchange treatment, and water flows into the desulfurizing slurry cooling system to circulate after heat exchange; the heat supply network heater uses steam turbine machine extraction steam as a heat source to heat circulating water in a heat supply network water supply pipeline, and the circulating water is used for heating equipment.
The method can recycle the waste heat of the steam turbine and the waste heat of the flue gas, can reduce the heat loss of the cold end of the steam turbine to zero, and uses the waste heat for heat supply; the waste heat of the recycled slurry can increase the heat supply capacity during the deep adjustment of the unit, the discharge of the atmospheric soluble salt is reduced after the exhaust gas temperature is reduced, the atmospheric quality is improved, and the discharge of pollutants such as smoke dust (containing soluble salt and the like) is further reduced; under the design working condition, the water vapor emission is reduced, the pollutant diffusion effect is obviously improved, the heat 262.2 Mo Jijiao can be recovered annually by recovering the residual heat of the circulating water in the slurry cooling device, the standard coal can be saved by 8.8 ten thousand tons per year, the circulating water evaporation capacity can be reduced by 5600 tons per day, the total heat supply season can save more than 80 ten thousand tons per year, the carbon dioxide emission is reduced by 223000 tons per year, the dust is reduced by 209 tons per year, the sulfur dioxide is reduced by 748 tons per year, and the nitrogen oxide is reduced by 651 tons per year; the flue gas temperature of the desulfurization slurry cooling system is reduced from 55 ℃ to 45-48 ℃, the total emission reduction of particulate matters is about 96.21 tons/year, the emission reduction of smoke dust is 4.01 tons/year, the emission reduction of soluble particulate matters is 92.2 tons/year, and the pollution reduction and carbon reduction effects are obvious.
Drawings
FIG. 1 is a schematic diagram of the operation of a second embodiment of the present application;
FIG. 2 is a schematic diagram of the operation of embodiment three of the present application;
reference numerals:
1. heating equipment 2, steam turbine 3, low pressure cylinder 4 and medium pressure cylinder
5. Heating steam extraction pipeline 6, heating network heater 7 and heating network water supply pipeline
8. Heat supply network return water pipeline 9, condenser 10 and cooling tower
11. Circulating water supply pipeline 12 and circulating water return pipeline
13. Waste water supply pipeline 14 and waste water return pipeline
15. Condensate recovery system 16 and desulfurization slurry cooling system
17. First circulating water pipe 18, second circulating water pipe 19 and heat pump
20. Pipeline one 21, pipeline two 22 and steam drainage pipeline one
23. Pipeline three 24, steam turbine one 25 and steam turbine two
26. Low pressure cylinder 27, medium pressure cylinder 28, and heat supply network heater
29. Circulation line one 30, circulation line two 31, and heating network heater two
32. Middle pressure cylinder two 33, low pressure cylinder two 34 and steam drainage pipeline
35. One-way pipe one 36, valve one 37 and one-way pipe two
38. Valve two 39, inlet channel 40, switch valve.
Detailed Description
The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be noted that the detailed description herein is presented for purposes of illustration and explanation only and is not intended to limit the utility model.
Embodiment one:
the embodiment provides a power plant waste heat recovery system, which comprises a flue gas recovery device, wherein the flue gas recovery device is connected with heating equipment 1, heat recovered by the flue gas recovery device is used for heating circulating water in the heating equipment 1, the heating equipment 1 is also connected with a flooding recovery device, heat recovered by the flooding recovery device is also used for heating the circulating water in the heating equipment 1, the heating equipment 1 adopts water heating equipment in the prior art, the flooding recovery device comprises a low-pressure cylinder 3 and a medium-pressure cylinder 4 which are connected with a steam turbine 2, the medium-pressure cylinder 4 is connected with a heat supply network heater 6 through a heating steam extraction pipeline 5, the heat supply network heater 6 is connected with a steam drainage pipeline 34, a heat supply network water supply pipeline 7 and a heat supply network water return pipeline 8 are arranged between the heat supply network heater 6 and the heating equipment 1, and the heat supply network water return pipeline 8 is connected with the flue gas recovery device; a water inlet pipeline 39 is arranged between the heat supply network water supply pipeline 7 and the heat supply network water return pipeline 8, a switch valve 40 is arranged on the water inlet pipeline 39, and water flow in the flue gas recovery device can be directly used as circulating water of the heating equipment 1 without being heated by the heat supply network heater 6; the heat supply network heater 6 heats circulating water in the heat supply network water supply pipeline 7 by extracting steam from the steam turbine 2, and heats the heating equipment 1 through the circulating water; the steam turbine 2 is connected with a condenser 9, the condenser 9 is connected with a cooling tower 10, a circulating water supply pipeline 11 and a circulating water return pipeline 12 are arranged between the cooling tower 10 and the condenser 9, the circulating water supply pipeline 11 is connected with a flue gas recovery device through a waste heat water supply pipeline 13 and a waste heat water return pipeline 14, and the condenser 9 is also connected with a condensed water recovery system 15; the high-temperature and high-pressure steam generated in the boiler enters the steam turbine 2 to do work, the low-temperature exhaust steam after the steam turbine 2 does work enters the condenser 9 to be condensed into water, then enters the cooling tower 10 through the circulating water supply pipeline 11, the cooling tower 10 cools the water, the cooled water is sent into the condenser 9 through the circulating water return pipeline 12, and the condenser 9 returns the cooled water to the boiler through the condensed water recovery system 15 to be heated again; the water flow in the circulating water supply pipeline 11 has a certain temperature, the residual water supply pipeline 13 supplies heat to the flue gas recovery device, the heat exchanged high temperature water enters the heat supply network water return pipeline 8, and then the heat supply network water return pipeline is heated by the heat supply network heater 6, so that the heating equipment 1 is heated by hot water circulation.
Embodiment two:
the present embodiment defines a flue gas recovery device, specifically:
the flue gas recovery device comprises a desulfurization slurry cooling system 16, wherein the desulfurization slurry cooling system 16 is a desulfurization slurry cooling system in the prior art, and the desulfurization slurry cooling system is not improved in the application and is not described in detail herein; the desulfurization slurry cooling system 16 is connected with a heat pump 19 through a first circulating water pipeline 17 and a second circulating water pipeline 18, and the heat pump 19 is connected with a heat supply network water return pipeline 8 through a first pipeline 20 and a second pipeline 21; the desulfurization slurry cooling system 16 reduces the temperature of the flue gas to be 45-48 ℃ from 55 ℃, condenses the flue gas into liquid, supplies heat to the heat pump through the first circulating water pipeline 17, returns the low-temperature liquid after heat exchange to the desulfurization slurry cooling system 16 through the first circulating water pipeline 18 for next circulation, and enters the heat supply network water return pipeline 8 through the first pipeline 20 and/or the second pipeline 21 for circulation in the heating equipment 1 for heat supply to the heating equipment 1; the heat pump 19 is connected with the waste water supply pipeline 13 and the waste water return pipeline 14; the water flow in the circulating water supply pipeline 11 exchanges heat with the heat pump 19 through the waste heat water supply pipeline 13, and the low-temperature liquid after heat exchange flows back to the circulating water supply pipeline 11 through the waste heat water return pipeline 14 and then flows into the cooling tower 10; the heat pump 19 is connected with a first steam drain pipeline 22, and non-condensable gases such as steam condensate and air in the heat pump 19 are discharged through the first steam drain pipeline 21, so that the situation of blockage and the like is prevented, and the service life of equipment is prolonged.
Preferably, the heat pump 19 is further connected with the heating steam extraction pipeline 5 between the medium pressure cylinder 4 and the heat supply network heater 6 through a pipeline III 23, and the steam formed after heat exchange can directly enter the heat supply network heater 6 through the pipeline III 23 and the heating steam extraction pipeline 5 and be used as a heat source of circulating water in the heating equipment 1.
Embodiment III:
the embodiment improves the practicability, saves the energy to the greatest extent, and particularly:
the steam turbine 2 comprises a first steam turbine 24 and a second steam turbine 25, wherein the first steam turbine 24 is connected with a first low-pressure cylinder 26 and a first medium-pressure cylinder 27, the first medium-pressure cylinder 27 is connected with a first heat supply network heater 28, the first heat supply network heater 28 is connected with a second heat supply network heater 31 through a first circulating pipeline 29 and a second circulating pipeline 30, the second heat supply network heater 31 is connected with a second medium-pressure cylinder 32, the second medium-pressure cylinder 32 is connected with a second low-pressure cylinder 33, and the second steam turbine 25 is connected with the condenser 9; the first heating network heater 28 and the second heating network heater 29 are both connected with a steam drainage pipeline 34, and non-condensable gases such as steam condensate and air in the first heating network heater 28 and the second heating network heater 31 are discharged through the steam drainage pipeline 34, so that the situation of blockage and the like is prevented, and the service life of equipment is prolonged.
As a preferable scheme, a one-way pipe I35 is arranged between the heat supply network water supply pipeline 7 and the heat supply network water return pipeline 8, and a valve I36 is arranged on the one-way pipe I35; the liquid which does not need to be heated directly flows into the heating equipment 1 through the one-way pipe 35 for heating and heat exchange, so that the heat energy is saved; as a preferable scheme, a second unidirectional pipe 37 is arranged between the first circulation pipeline 29 and the second circulation pipeline 30, a second valve 38 is arranged on the second unidirectional pipe 37, and only the liquid heated by one heating network heater enters the heating network water supply pipeline 7 through the second unidirectional pipe 37, and enters the heating equipment 1 for heating and heat exchange after being heated by the first heating network heater 28, so that the effect of saving heat energy can be realized.
The working principle of the utility model is as follows: the high-temperature and high-pressure steam generated in the boiler enters a first turbine 24 and a second turbine 25 to do work, the low-temperature exhaust steam generated after the second turbine 25 does work enters a condenser 9 to be condensed into water, then enters a cooling tower 10 through a circulating water supply pipeline 11, the cooling tower 10 cools the water, the cooled water is sent into the condenser 9 through a circulating water return pipeline 12, and the condenser 9 returns the water to the boiler through a condensed water recovery system 15 to be reheated; the water flow in the circulating water supply pipeline 11 has a certain temperature, enters the heat supply network water return pipeline 8 through the residual water supply pipeline 13, is heated through the first heat supply network heater 28 and/or the second heat supply network heater 31, circulates hot water to the heating equipment 1, and can directly enter the heat supply network water supply pipeline 7 through the first unidirectional pipe 35 when the temperature reaches the requirement; non-condensable gases such as steam condensate water and air in the first heating network heater 28 and the second heating network heater 31 are discharged through a steam drainage pipeline 34; the gas phase in the desulfurizing tower is cooled by a desulfurizing slurry cooling system 16 to form liquid with a certain temperature, the liquid enters a heat pump 19 through a first circulating water pipeline 17 for heat exchange treatment, the heat exchanged high-temperature water flows into a heat supply network water return pipeline 8 for circulation, and the heat exchanged low-temperature water flows into the desulfurizing slurry cooling system 16 for circulation; the first heating network heater 28 and the second heating network heater 31 respectively utilize steam extracted by the first steam turbine 24 and the second steam turbine 25 as heat sources to heat circulating water in the heating network water supply pipeline 7, and heat the heating equipment 1 through the circulating water.
According to the method, the circulating water with proper temperature can be provided for the heating equipment 1 through the cooperation of the heating equipment 1, the flue gas recovery device and the flooding steam recovery device, so that energy is saved to the greatest extent; in summary, by adopting the technical scheme, the heat loss at the cold end of the steam turbine can be reduced to zero by recovering the waste heat of the steam turbine and the waste heat of the flue gas, and the waste heat is recycled for heat supply; the waste heat of the recycled slurry can increase the heat supply capacity during the deep adjustment of the unit, the discharge of the atmospheric soluble salt is reduced after the exhaust gas temperature is reduced, the atmospheric quality is improved, and the discharge of pollutants such as smoke dust (containing soluble salt and the like) is further reduced; under the design working condition, the water vapor emission is reduced, the pollutant diffusion effect is obviously improved, the heat 262.2 Mo Jijiao can be recovered in a year at maximum through recovering the waste heat of a steam turbine and the waste heat of flue gas, the standard coal can be saved by 8.8 ten thousand tons per year, the circulating water evaporation capacity 5600 tons per day can be reduced, the total heat supply season can save more than 80 ten thousand tons per year, the emission of carbon dioxide 223000 tons per year, the emission of dust 209 tons per year, the emission of sulfur dioxide 748 tons per year and the emission of nitrogen oxides 651 tons per year can be reduced; the flue gas temperature of the desulfurization slurry cooling system is reduced from 55 ℃ to 45-48 ℃, the total emission reduction of particulate matters is about 96.21 tons/year, the emission reduction of smoke dust is 4.01 tons/year, the emission reduction of soluble particulate matters is 92.2 tons/year, and the pollution reduction and carbon reduction effects are obvious.
The utility model is a detailed structure and connection relation in the prior art, and the utility model is not described in detail herein; the connection relationship between the above-described members is preferably fixed by a method well known in the art, such as a pipe connection.
The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details of the foregoing embodiments, and various simple modifications may be made to the technical solutions of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations of the present utility model are not described in detail.
Moreover, any combination of the various embodiments of the present application may be made without departing from the spirit of the present application, which is also to be considered as disclosed herein.
Claims (7)
1. The utility model provides a power plant waste heat recovery system, includes flue gas recovery unit, its characterized in that, flue gas recovery unit is connected with heating equipment (1), heating equipment (1) still is connected with the steam flooding recovery unit, the steam flooding recovery unit includes low pressure cylinder (3) and middling pressure cylinder (4) that are connected with steam turbine (2), middling pressure cylinder (4) are connected with heat supply network heater (6), are equipped with heat supply network water supply pipe (7) and heat supply network return pipe (8) between heat supply network heater (6) and heating equipment (1), heat supply network return pipe (8) are connected with flue gas recovery unit, be equipped with steam drainage pipeline (34) on heat supply network heater (6); the steam turbine (2) is connected with the condenser (9), the condenser (9) is connected with the cooling tower (10), a circulating water supply pipeline (11) and a circulating water return pipeline (12) are arranged between the cooling tower (10) and the condenser (9), the circulating water supply pipeline (11) is connected with the flue gas recovery device through a waste heat water supply pipeline (13) and a waste heat water return pipeline (14), and the condenser (9) is further connected with a condensation water recovery system (15).
2. A power plant waste heat recovery system according to claim 1, characterized in that the flue gas recovery device comprises a desulphurized slurry cooling system (16), the desulphurized slurry cooling system (16) is connected with a heat pump (19) through a first circulating water pipe (17), a second circulating water pipe (18), the heat pump (19) is connected with a heat supply network water return pipe (8) through a first pipeline (20), a second pipeline (21), the heat pump (19) is connected with the waste heat water supply pipe (13), and the waste heat water return pipe (14); and the heat pump (19) is connected with a first steam drain pipeline (22).
3. A plant waste heat recovery system according to claim 1, characterized in that a water inlet pipe (39) is arranged between the heat supply network water supply pipe (7) and the heat supply network water return pipe (8), and a switch valve (40) is arranged on the water inlet pipe (39).
4. A plant waste heat recovery system according to claim 2, characterized in that the heat pump (19) is also connected via a line three (23) to a heating extraction pipe (5) between the medium pressure cylinder (4) and the heat supply network heater (6).
5. A plant waste heat recovery system according to claim 2, wherein the steam turbine (2) comprises a first steam turbine (24) and a second steam turbine (25), wherein the first steam turbine (24) is connected with a first low pressure cylinder (26) and a first medium pressure cylinder (27), the first medium pressure cylinder (27) is connected with a first heat supply network heater (28), the first heat supply network heater (28) is connected with a second heat supply network heater (31) through a first circulation pipeline (29) and a second circulation pipeline (30), the second heat supply network heater (31) is connected with a second medium pressure cylinder (32), the second medium pressure cylinder (32) is connected with a second low pressure cylinder (33), and the second steam turbine (25) is connected with the condenser (9); and the first heat supply network heater (28) and the second heat supply network heater (31) are connected with a steam drainage pipeline (34).
6. A plant waste heat recovery system according to claim 1, characterized in that a one-way pipe (35) is arranged between the heat supply network water supply pipeline (7) and the heat supply network water return pipeline (8), and a valve (36) is arranged on the one-way pipe (35).
7. The power plant waste heat recovery system according to claim 5, wherein a one-way pipe II (37) is arranged between the first circulating pipeline (29) and the second circulating pipeline (30), and a valve II (38) is arranged on the one-way pipe II (37).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202223469606.9U CN219366122U (en) | 2022-12-23 | 2022-12-23 | Waste heat recovery system of power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223469606.9U CN219366122U (en) | 2022-12-23 | 2022-12-23 | Waste heat recovery system of power plant |
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| CN219366122U true CN219366122U (en) | 2023-07-18 |
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| CN202223469606.9U Active CN219366122U (en) | 2022-12-23 | 2022-12-23 | Waste heat recovery system of power plant |
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