CN112283697A - Direct air cooling unit cold end exhaust steam waste heat utilization system combined with absorption heat pump - Google Patents
Direct air cooling unit cold end exhaust steam waste heat utilization system combined with absorption heat pump Download PDFInfo
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- CN112283697A CN112283697A CN202011224392.1A CN202011224392A CN112283697A CN 112283697 A CN112283697 A CN 112283697A CN 202011224392 A CN202011224392 A CN 202011224392A CN 112283697 A CN112283697 A CN 112283697A
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- pipeline
- steam
- heat pump
- absorption heat
- air cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
Abstract
The invention discloses a cold-end exhaust steam waste heat utilization system of a direct air cooling unit combined with an absorption heat pump, which comprises a steam turbine intermediate pressure cylinder, wherein the steam turbine intermediate pressure cylinder is respectively connected with the absorption heat pump and a steam turbine low pressure cylinder through pipelines, a steam exhaust device is arranged below the steam turbine low pressure cylinder, the bottom of the steam exhaust device is connected with a heat exchanger, the heat exchanger and the absorption heat pump form a circulation loop through pipelines, the side wall of the steam exhaust device is connected with a steam exhaust pipeline, the other end of the steam exhaust pipeline is connected with an air cooling island, the absorption heat pump and a mechanical ventilation tower, the air cooling island is connected with the steam exhaust device through a condensate pipe, the absorption heat pump is connected with a condensate pipe through a pipeline, the absorption heat pump is further connected with a heating network heater through a pipeline and forms a circulation loop, the heating network heater is further connected. The invention solves the problems that the waste heat of the exhaust steam can not be effectively recycled and the comprehensive utilization rate of energy is greatly reduced due to the loss of the waste heat of the exhaust steam in the prior art.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and relates to a system for utilizing waste steam waste heat at a cold end of a direct air cooling unit in combination with an absorption heat pump.
Background
The proportion of thermal power in the energy ratio is still the first place, while the proportion of air cooling units in the thermal power units is up to more than 20%, and the water-saving advantage enables the air cooling units to be widely constructed in arid water-deficient areas in the northwest of China and become electric energy pillars in the areas. The air cooling units are mainly divided into two types, namely direct air cooling and indirect air cooling. Both air cooling units eventually release heat to the air, and therefore, the air cooling units are severely affected by environmental conditions. The temperature change range of the whole year in the area of the direct air cooling unit is large, the direct air cooling unit is extremely cold in winter and high in summer, the operation condition is severe, the fluctuation range of the operation parameters of the unit is large, problems are easy to generate, and the operation and maintenance difficulty is large.
At present, the performance degradation phenomenon of the cold end of a steam turbine unit adopting a direct air cooling system generally exists, particularly in summer, the unit often limits load promotion due to the fact that fine processing overtemperature operation is caused by overhigh back pressure, and the load limitation not only reduces the income of a power plant, but also enables the unit to face the risk of power grid examination. The main factor influencing the performance of the air cooling unit is cold end cold source loss, the existing method for improving the performance of the direct air cooling cold end mainly comprises the steps of adding a peak cooling system, expanding the capacity of an air cooling island, adding a peak condenser by utilizing the cooling allowance of an auxiliary machine and the like, and no matter which form of exhaust steam waste heat is adopted, the exhaust steam waste heat cannot be effectively recycled, so that the comprehensive energy utilization rate is greatly reduced due to the loss of the exhaust steam waste heat.
Disclosure of Invention
The invention aims to provide a system for utilizing waste heat of exhaust steam at the cold end of a direct air cooling unit in combination with an absorption heat pump, and solves the problems that the waste heat of the exhaust steam cannot be effectively recycled and the comprehensive utilization rate of energy is greatly reduced due to the loss of the waste heat of the exhaust steam in the prior art.
The invention adopts the technical scheme that the cold-end exhaust steam waste heat utilization system of the direct air cooling unit combined with the absorption heat pump comprises a steam turbine intermediate pressure cylinder, an exhaust port of the steam turbine intermediate pressure cylinder is respectively connected with the absorption heat pump and a steam turbine low pressure cylinder through pipelines, a steam exhaust device is arranged below the steam turbine low pressure cylinder, the bottom of the steam exhaust device is connected with a heat exchanger through a pipeline, the heat exchanger and the absorption heat pump form a circulation loop through a pipeline, a steam exhaust pipeline is connected above the side wall of the steam exhaust device, the other end of the steam exhaust pipeline is divided into three paths and is respectively connected with an air cooling, the absorption heat pump is connected with a heat supply network heater through a pipeline and forms a circulation loop, the heat supply network heater is connected with a heat exchanger through a pipeline, and the mechanical ventilation tower is connected with the condensate pipe through a pipeline.
The present invention is also characterized in that,
exhaust gas of the turbine intermediate pressure cylinder enters the absorption heat pump through a pipeline and then flows out of the absorption heat pump through a pipeline to be connected with a deaerator.
The heat exchanger is also connected with a heater through a pipeline.
A condensate pump is arranged on the pipeline between the bottom of the steam exhaust device and the heat exchanger.
The heat exchanger is connected with the absorption heat pump through a pipeline G1, a pipeline G1 is divided into two pipelines G2 and G3 through the absorption heat pump to be respectively connected with the heat exchanger and the heat supply network heater, a second circulating pump is arranged on the pipeline G1, and a first valve and a second valve are respectively arranged on the pipeline G2 and the pipeline G3.
The absorption heat pump is connected with the condensed water pipe through a pipeline G4, and a third circulating pump is arranged on a pipeline G4.
The upper part of the side wall of the steam exhaust device is connected with a steam exhaust pipeline, the other end of the steam exhaust pipeline is divided into three pipelines which are respectively a pipeline G5, a pipeline G6 and a pipeline G7, the other ends of the pipeline G5, the pipeline G6 and the pipeline G7 are respectively connected with an air cooling island, an absorption heat pump and a mechanical ventilation tower, and a fourth valve and a third valve are respectively arranged on the pipeline G6 and the pipeline G7.
The mechanical draft tower is connected with a condensed water pipe through a pipeline G8, and a first circulating pump is arranged on a pipeline G8.
The heat net heater is connected to a pipe G1 through a pipe G9 at a position on the side of the second circulation pump close to the absorption heat pump.
The invention has the beneficial effects that:
according to the air cooling unit, the back pressure can be reduced under the summer working condition, the summer load capacity of the unit is improved, meanwhile, the exhaust steam waste heat is recycled to heat condensed water, the cold source loss of the unit is reduced, and the heat efficiency of a heat regeneration system of a condensed water system is improved; the air cooling unit adopts an absorption heat pump waste heat utilization system under the working condition in winter, the loss of a cold source is minimized, the heat efficiency of a heat return system of a condensate system can be improved, and the heat supply capacity of the air cooling unit can also be improved; therefore, the system greatly improves the overall economy and safety of the unit, reduces the examination pressure of the power grid and maximizes the comprehensive benefits.
Drawings
Fig. 1 is a schematic structural diagram of a waste steam waste heat utilization system at a cold end of a direct air cooling unit combined with an absorption heat pump.
In the figure, 1, a turbine intermediate pressure cylinder, 2, an absorption heat pump, 3, a turbine low pressure cylinder, 4, a steam exhaust device, 5, a heat exchanger, 6, a steam exhaust pipeline, 7, a first circulating pump, 8, an air cooling island, 9, a condensate pipe, 10, a heat supply network heater, 11, a mechanical ventilation tower, 12, a deaerator, 13, a heater, 14, a condensate pump, 15, a second circulating pump, 16, a first valve, 17, a second valve, 18, a third circulating pump, 19, a fourth valve and 20, a third valve.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a cold-end exhaust steam waste heat utilization system of a direct air cooling unit combined with an absorption heat pump, which has a structure shown in figure 1 and comprises a steam turbine intermediate pressure cylinder 1, wherein an exhaust port of the steam turbine intermediate pressure cylinder 1 is respectively connected with an absorption heat pump 2 and a steam turbine low pressure cylinder 3 through pipelines, a steam exhaust device 4 is arranged below the steam turbine low pressure cylinder 3, the bottom of the steam exhaust device 4 is connected with a heat exchanger 5 through a pipeline, the heat exchanger 5 and the absorption heat pump 2 form a circulation loop through a pipeline, a steam exhaust pipeline 6 is connected above the side wall of the steam exhaust device 4, the other end of the steam exhaust pipeline 6 is divided into three paths and is respectively connected with an air cooling island 8, the absorption heat pump 2 and a mechanical draft tower 11, the air cooling island 8 is also connected with the steam exhaust device 4 through a condensate pipe 9, the absorption heat pump 2 is also connected with a condensate pipe 9, the heat supply network heater 10 is also connected with the heat exchanger 5 through a pipeline, and the mechanical ventilation tower 11 is also connected with the condensate pipe 9 through a pipeline.
Exhaust gas of the turbine intermediate pressure cylinder 1 enters the absorption heat pump 2 through a pipeline and then flows out of the absorption heat pump 2 and is connected with the deaerator 12 through a pipeline.
The heat exchanger 5 is also connected with a heater 13 through a pipeline.
A condensate pump 14 is arranged on a pipeline between the bottom of the steam exhaust device 4 and the heat exchanger 5.
The heat exchanger 5 is connected with the absorption heat pump 2 through a pipeline G1, a pipeline G1 is divided into two pipelines G2 and G3 after passing through the absorption heat pump 2 and respectively connected with the heat exchanger 5 and the heat network heater 10, a second circulating pump 15 is arranged on the pipeline G1, and a first valve 16 and a second valve 17 are respectively arranged on the pipeline G2 and the pipeline G3.
The absorption heat pump 2 is connected to the condensate pipe 9 through a pipe G4, and a third circulation pump 18 is provided on a pipe G4.
The upper part of the side wall of the steam exhaust device 4 is connected with a steam exhaust pipeline 6, the other end of the steam exhaust pipeline 6 is divided into three pipelines which are respectively a pipeline G5, a pipeline G6 and a pipeline G7, the other ends of the pipeline G5, the pipeline G6 and the pipeline G7 are respectively connected with the air cooling island 8, the absorption heat pump 2 and the mechanical draft tower 11, and a fourth valve 19 and a third valve 20 are respectively arranged on the pipeline G6 and the pipeline G7.
The mechanical draft tower 11 is connected with the condensed water pipe 9 through a pipeline G8, and a first circulating pump 7 is arranged on a pipeline G8.
The heat net heater 10 is connected to a pipe G1 through a pipe G9 at a position on the side of the second circulation pump 15 close to the absorption heat pump 2.
The working process of the invention is as follows:
and in summer working conditions of the air cooling unit, the second valve 17 is closed, and the heat supply network heater 10 is not put into use. One part of the steam discharged by the steam turbine intermediate pressure cylinder 1 flows to the steam turbine low pressure cylinder 3, the other part of the steam flows to the absorption heat pump 2 as intermediate exhaust steam, and the intermediate exhaust steam is used as driving steam of the absorption heat pump 2 and is changed into steam after passing through the absorption heat pump 2 to drain water and flows to the deaerator 12; the low-pressure cylinder 3 of the steam turbine exhausts steam to the upper steam exhaust device 4, the exhausted steam is divided into three parts through an exhaust steam pipeline 6, the first part of exhausted steam flows to the absorption heat pump 2 through a fourth valve 19 to be used as a low-temperature heat source of the absorption heat pump 2, the cooled exhausted steam flows to a third circulating pump 18 and then flows to a condensate pipe 9, and the flow rate of the part of exhausted steam needs to be in heat matching with the flow rate of condensate; the second part of dead steam flows to the mechanical draft tower 11 through a third valve 20, is cooled to become condensed water and flows to a condensed water pipe 9 through a first circulating pump 7; the third part of dead steam flows to the air cooling island 8 and flows to the condensate pipe 9 after being cooled; the adjustment of the cold end back pressure can be realized by adjusting the flow of the second part of the dead steam. Circulating water of the absorption heat pump 2 flows to the heat exchanger 5 through the first valve 16 to heat the condensed water, and the circulating water flows back to the absorption heat pump 2 through the second circulating pump 15 after flowing through the heat exchanger 5. The condensate flows to the heat exchanger 5 through the condensate pump 14, is heated, and then flows to the low-pressure heater 13.
And under the working condition of the air cooling unit in winter, the third valve 20 is closed, and the mechanical ventilation tower 11 is not put into use. One part of the steam discharged by the steam turbine intermediate pressure cylinder 1 flows to the steam turbine low pressure cylinder 3, the other part of the steam flows to the absorption heat pump 2 as intermediate exhaust steam, and the intermediate exhaust steam is used as driving steam of the absorption heat pump 2 and is changed into steam after passing through the absorption heat pump 2 to drain water and flows to the deaerator 12; the low-pressure cylinder 3 of the steam turbine exhausts steam to an upper steam exhaust device 4, the exhausted steam is divided into two parts through a steam exhaust pipeline 6, the first part of exhausted steam flows to the absorption heat pump 2 through a fourth valve 19 to be used as a low-temperature heat source of the absorption heat pump 2, the cooled exhausted steam flows to a third circulating pump 18 and then flows to a condensate pipe 9, and the flow of the part of exhausted steam needs to be subjected to heat matching with the flow of condensate and the flow of heat network water; the second part of the dead steam flows to the air cooling island 8 and flows to the condensate pipe 9 after being cooled. Circulating water of the absorption heat pump 2 is divided into two parts, wherein one part of the circulating water flows to the heat exchanger 5 through the first valve 16 to heat condensed water, and the circulating water flows back to the absorption heat pump through the circulating pump 2 after flowing through the heat exchanger; the other part of circulating water flows to the heat supply network heater through the valve 2, and flows to the second circulating pump 15 to flow back to the absorption heat pump 2 after heating the heat supply network water. The heat supply network water flows to the peak heat supply network heater after being heated by the heat supply network heater. The condensed water flows to the heat exchanger 5 through the condensed water pump 14, and flows to the low pressure heater after being heated.
According to the direct air cooling unit cold end exhaust steam waste heat utilization system combined with the absorption heat pump, the air cooling unit can reduce back pressure under summer working conditions, the summer load capacity of the unit is improved, meanwhile, exhaust steam waste heat is recycled to heat condensed water, the unit cold source loss is reduced, and the heat efficiency of a heat regeneration system of a condensed water system is improved; the air cooling unit adopts an absorption heat pump waste heat utilization system under the working condition in winter, the loss of a cold source is minimized, the heat efficiency of a heat return system of a condensate system can be improved, and the heat supply capacity of the air cooling unit can also be improved; therefore, the system greatly improves the overall economy and safety of the unit, reduces the examination pressure of the power grid and maximizes the comprehensive benefits.
Claims (9)
1. The system for utilizing the cold-end exhaust steam waste heat of the direct air cooling unit combined with the absorption heat pump is characterized by comprising a steam turbine intermediate pressure cylinder (1), wherein an exhaust port of the steam turbine intermediate pressure cylinder (1) is respectively connected with an absorption heat pump (2) and a steam turbine low pressure cylinder (3) through pipelines, a steam exhaust device (4) is arranged below the steam turbine low pressure cylinder (3), the bottom of the steam exhaust device (4) is connected with a heat exchanger (5) through a pipeline, the heat exchanger (5) and the absorption heat pump (2) form a circulation loop through a pipeline, a steam exhaust pipeline (6) is connected above the side wall of the steam exhaust device (4), the other end of the steam exhaust pipeline (6) is divided into three paths and is respectively connected with an air cooling island (8), the absorption heat pump (2) and a mechanical draft tower (11), the air cooling island (8) is also connected with the steam exhaust device (4) through a, the absorption heat pump (2) is further connected with the condensed water pipe (9) through a pipeline, the absorption heat pump (2) is further connected with a heat supply network heater (10) through a pipeline and forms a circulation loop, the heat supply network heater (10) is further connected with the heat exchanger (5) through a pipeline, and the mechanical ventilation tower (11) is further connected with the condensed water pipe (9) through a pipeline.
2. The system for utilizing the exhaust steam waste heat at the cold end of the direct air cooling unit combined with the absorption heat pump as claimed in claim 1, wherein the exhaust gas of the steam turbine intermediate pressure cylinder (1) enters the absorption heat pump (2) through a pipeline and then flows out of the absorption heat pump (2) and is connected with the deaerator (12) through a pipeline.
3. The system for utilizing the exhaust steam waste heat at the cold end of the direct air cooling unit combined with the absorption heat pump as claimed in claim 1, wherein the heat exchanger (5) is further connected with a heater (13) through a pipeline.
4. The system for utilizing the exhaust steam waste heat at the cold end of the direct air cooling unit combined with the absorption heat pump as claimed in claim 1, wherein a condensate pump (14) is arranged on a pipeline between the bottom of the steam exhaust device (4) and the heat exchanger (5).
5. The system for utilizing the cold-end exhaust steam waste heat of the direct air cooling unit combined with the absorption heat pump according to claim 1, wherein the heat exchanger (5) is connected with the absorption heat pump (2) through a pipeline G1, the pipeline G1 is divided into two pipelines G2 and G3 through the absorption heat pump (2) and is respectively connected with the heat exchanger (5) and the heat supply network heater (10), the pipeline G1 is provided with a second circulating pump (15), and the pipeline G2 and the pipeline G3 are respectively provided with a first valve (16) and a second valve (17).
6. The system for utilizing the cold-end exhaust steam waste heat of the direct air cooling unit combined with the absorption heat pump as claimed in claim 5, wherein the absorption heat pump (2) is connected with the condensation water pipe (9) through a pipeline G4, and a third circulating pump (18) is arranged on the pipeline G4.
7. The system for utilizing the cold-end exhaust steam waste heat of the direct air cooling unit combined with the absorption heat pump as claimed in claim 6, wherein the exhaust steam pipeline (6) is connected above the side wall of the exhaust steam device (4), the other end of the exhaust steam pipeline (6) is divided into three pipelines which are respectively a pipeline G5, a pipeline G6 and a pipeline G7, the other ends of the pipeline G5, the pipeline G6 and the pipeline G7 are respectively connected with the air cooling island (8), the absorption heat pump (2) and the mechanical draft tower (11), and the pipelines G6 and G7 are respectively provided with a fourth valve (19) and a third valve (20).
8. The system for utilizing waste heat of cold end exhaust steam of direct air cooling unit combined with absorption heat pump according to claim 7, wherein the mechanical ventilation tower (11) is connected with the condensed water pipe (9) through a pipe G8, and a first circulating pump (7) is arranged on the pipe G8.
9. The system of claim 8, wherein the heat network heater (10) is connected to the conduit G1 via conduit G9 at a location on the side of the second circulation pump (15) adjacent to the absorption heat pump (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011224392.1A CN112283697A (en) | 2020-11-05 | 2020-11-05 | Direct air cooling unit cold end exhaust steam waste heat utilization system combined with absorption heat pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011224392.1A CN112283697A (en) | 2020-11-05 | 2020-11-05 | Direct air cooling unit cold end exhaust steam waste heat utilization system combined with absorption heat pump |
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| Publication Number | Publication Date |
|---|---|
| CN112283697A true CN112283697A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011224392.1A Pending CN112283697A (en) | 2020-11-05 | 2020-11-05 | Direct air cooling unit cold end exhaust steam waste heat utilization system combined with absorption heat pump |
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| CN (1) | CN112283697A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847825A (en) * | 2021-09-18 | 2021-12-28 | 西安热工研究院有限公司 | System and method for adjusting cooling water amount of independent condenser of small turbine of induced draft fan |
-
2020
- 2020-11-05 CN CN202011224392.1A patent/CN112283697A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847825A (en) * | 2021-09-18 | 2021-12-28 | 西安热工研究院有限公司 | System and method for adjusting cooling water amount of independent condenser of small turbine of induced draft fan |
| CN113847825B (en) * | 2021-09-18 | 2024-03-12 | 西安热工研究院有限公司 | System and method for adjusting cooling water quantity of independent condenser of small induced draft fan turbine |
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