CN215333021U - Residual pressure and waste heat utilization system for heat supply air cooling unit changed from straight condensing - Google Patents
Residual pressure and waste heat utilization system for heat supply air cooling unit changed from straight condensing Download PDFInfo
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- CN215333021U CN215333021U CN202120983369.4U CN202120983369U CN215333021U CN 215333021 U CN215333021 U CN 215333021U CN 202120983369 U CN202120983369 U CN 202120983369U CN 215333021 U CN215333021 U CN 215333021U
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Abstract
The utility model discloses a system for utilizing waste heat of a pure condensation-modified heat supply air cooling unit, which comprises a medium pressure cylinder and a low pressure cylinder which are sequentially arranged on an exhaust pipeline of a coal-fired unit, wherein a steam outlet pipeline of the low pressure cylinder is connected with a heat supply network heater; a low-pressure turbine is arranged on a heating steam extraction pipeline of the intermediate pressure cylinder, the low-pressure turbine is communicated with an asynchronous generator, a steam ejector is arranged on a steam exhaust pipeline of the low-pressure turbine, and a steam outlet pipeline of the steam ejector is connected to a heat supply network heater; the heat supply network heater is connected with a heat supply network through a heat supply network water supply pipeline for supplying heat, and the return water of the heat supply network is respectively connected with the heat supply network heat exchanger and the water inlet end of the air cooling island through a heat supply network return water pipeline. According to the utility model, the low-pressure turbine and the steam ejector equipment are additionally arranged, the steam discharged by the turbine is used as the first-stage heating of heat supply network water, the steam discharged by the steam ejector is used as the second-stage heating, and the heating extracted steam is used as the third-stage peak heating, so that the synchronous recovery of the residual pressure and the waste heat is realized.
Description
Technical Field
The utility model relates to the technical field of energy-saving modification of coal-fired power plants, in particular to a residual pressure and waste heat utilization system of a straight condensing modified heat supply air cooling unit.
Background
With the continuous promotion of ultra-low emission and energy-saving transformation actions of coal-fired power plants in China, the average power supply coal consumption after the transformation of the existing coal-fired power generating sets is required to be lower than the target of 310 g/(kW.h). The case that the existing heat supply unit carries out residual pressure and waste heat transformation is quite common. The pressure loss of the heating steam extraction pressure of the straight condensing-reforming heat supply unit is higher, generally between 0.7MPa and 1MPa, and the pressure loss of the straight condensing-reforming heat supply unit and the pressure required by the heating steam extraction is more than 0.5MPa, so that the excess pressure utilization has great potential. For the air cooling unit, the exhaust pressure is higher, and the waste heat recovery and transformation in the heat supply period are very common. Therefore, the waste of the residual pressure and the waste heat at the same time of the heat supply air cooling unit is changed from pure condensation, and a transformation system capable of utilizing the residual pressure and the waste heat at the same time is urgently needed, so that the cascade utilization and the waste heat recovery of the steam quality are realized, and the national policy of energy conservation and emission reduction is fulfilled.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a residual pressure and residual heat utilization system of a heating air cooling unit changed from straight condensing,
in order to solve the technical problems, the technical scheme adopted by the utility model is as follows.
A kind of pure condensing changes the surplus pressure waste heat utilization system of the air cooling unit of heat supply, including setting up in the exhaust duct of the coal-fired unit sequentially and using for heating to bleed the intermediate pressure cylinder and low-pressure cylinder, connect with the heating network heater used for heating the water of heating network on the steam outlet pipeline of the low-pressure cylinder; a low-pressure turbine is arranged on a heating steam extraction pipeline of the intermediate pressure cylinder, an asynchronous generator for steam power generation is communicated with the low-pressure turbine, a steam ejector for heat exchange is arranged on a steam exhaust pipeline of the low-pressure turbine, and a steam outlet pipeline of the steam ejector is connected to a heating network heater; the heat supply network heater is connected with a heat supply network through a heat supply network water supply pipeline for supplying heat, and the return water of the heat supply network is respectively connected with the heat supply network heat exchanger and the water inlet end of the air cooling island through a heat supply network return water pipeline.
Above-mentioned pure congealing changes heat supply air cooling unit excess pressure waste heat utilization system, be connected with the generator that is used for the electricity generation on the low pressure jar.
The utility model provides an above-mentioned straight condensing changes heat supply air cooling unit residual pressure waste heat utilization system, the heat supply network heater includes series connection's one-level heat supply network heater, second grade heat supply network heater and tertiary heat supply network heater, and the steam inlet end of one-level heat supply network heater is connected at low pressure jar steam outlet end, and the steam inlet end of second grade heat supply network heater is connected at the steam outlet end of steam ejector, and the steam inlet end of tertiary heat supply network heater is connected on the heating steam extraction pipeline of intermediate pressure jar, and the steam outlet end of tertiary heat supply network heater is connected at the steam inlet end of second grade heat supply network heater, and the steam outlet end of second grade heat supply network heater is connected at the steam inlet end of one-level heat supply network heater, and the steam outlet end of one-level heat supply network heater is connected at the steam inlet end of air cooling island.
The system for utilizing the residual pressure and the residual heat of the straight condensing-modified heat supply air cooling unit is characterized in that a low-pressure turbine bypass for switching on and off the low-pressure turbine is arranged on the low-pressure turbine in parallel.
Due to the adoption of the technical scheme, the technical progress of the utility model is as follows.
According to the utility model, the low-pressure turbine and the steam ejector equipment are additionally arranged, heating extraction steam is used as low-pressure turbine inlet steam, exhaust steam enters the steam ejector and is used as power steam to eject steam of the turbine, the turbine exhaust steam is used as first-stage heating of heat supply network water, the steam ejector exhaust steam is used as second-stage heating, and the heating extraction steam is used as third-stage peak heating, so that synchronous recovery of residual pressure waste heat is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein: 1. the system comprises an intermediate pressure cylinder, a low pressure cylinder 2, a generator 3, a low pressure turbine bypass 4, a low pressure turbine 5, an asynchronous generator 6, a steam ejector 7, a secondary heat supply network heater 8, a tertiary heat supply network heater 9, a heat supply network water supply pipeline 10, a primary heat supply network heater 11, a heat supply network water return pipeline 12 and an air cooling island 13.
Detailed Description
The utility model will be described in further detail below with reference to the figures and specific examples.
The utility model provides a pure condensing changes hot air cooling unit residual pressure waste heat utilization system, its structure is shown as figure 1, includes intermediate pressure jar 1, low pressure jar 2, low pressure steam turbine 5, steam ejector 7, heat supply network heater and air cooling island 13. The intermediate pressure cylinder 1 and the low pressure cylinder 2 are sequentially arranged on an exhaust pipeline of the coal-fired unit, the low pressure turbine 5 is arranged on a steam extraction pipeline of the intermediate pressure cylinder, the steam ejector 7 is arranged on a steam extraction pipeline of the low pressure turbine 5 and used for exchanging heat with steam, the heat supply network heater is connected on steam outlet pipelines of the low pressure cylinder 2 and the steam ejector 7 and used for heating heat supply network water, and the air cooling island 13 is connected on the steam outlet pipeline of the heat supply network heater and the heat supply network backwater and used for cooling steam discharged by the heat supply network heater.
The low pressure cylinder 2 is arranged on an exhaust pipeline behind the intermediate pressure cylinder 1, a heating steam extraction pipeline of the intermediate pressure cylinder 1 is connected to the low pressure cylinder 2, the low pressure cylinder 2 is connected with a generator 3 for generating power, when the low pressure cylinder 2 is insufficient in steam, the steam of the intermediate pressure cylinder 1 is extracted for generating power, a steam outlet pipeline of the low pressure cylinder 2 is connected to a heating network heater, and the heating network is heated by using steam waste heat.
The low pressure steam turbine 5 is arranged on a heating steam extraction pipeline of the intermediate pressure cylinder 1, the low pressure steam turbine 5 is connected with an asynchronous generator 6, heating steam extraction of the intermediate pressure cylinder 1 enters the low pressure steam turbine 5 to do work, the asynchronous generator 6 is dragged to generate electricity, power consumption of a power plant is reduced, and exhaust steam of the low pressure steam turbine 5 enters a steam ejector 7 to eject part of steam turbine exhaust steam.
The heating steam extraction pipeline of the intermediate pressure cylinder 1 is also connected to a heat supply network heater and used for peak heating of heat supply network water. The heat supply network heater comprises a first-stage heat supply network heater 11, a second-stage heat supply network heater 8 and a third-stage heat supply network heater 9 which are connected in series, wherein a steam inlet end of the first-stage heat supply network heater 11 is connected with a steam outlet end of the low-pressure cylinder 2, a steam inlet end of the second-stage heat supply network heater 8 is connected with a steam outlet end of the steam ejector 7, a steam outlet end of the third-stage heat supply network heater 9 is connected with a heating steam extraction pipeline of the medium-pressure cylinder, a steam outlet end of the third-stage heat supply network heater 9 is connected with a steam inlet end of the second-stage heat supply network heater 8, a steam outlet end of the second-stage heat supply network heater 8 is connected with a steam inlet end of the first-stage heat supply network heater 11, and a steam outlet end of the first-stage heat supply network heater is connected with a steam inlet end of the air cooling island 13. The third-stage heating network heater 9 supplies heat to the heating network through a heating network water supply pipeline 10, and the return water of the heating network is respectively connected to the water inlet ends of the first-stage heating network heater 11 and the air cooling island 13 through a heating network return water pipeline 12.
After the return water of the heat supply network enters the air cooling island 13, the steam discharged by the low-pressure turbine 5 is used as the first-stage heating, then the steam discharged by the steam ejector 7 is used as the second-stage heating, at the moment, the steam discharged by the steam ejector 7 is increased by the steam discharged by the low-pressure turbine 5 with relatively high pressure parameters to increase the steam pressure of the exhaust steam, the temperature of the heat supply network is increased again, and finally, the heating steam with the highest steam extraction parameter is used as peak heating to reach the temperature required by the external heat supply network.
The low-pressure turbine 5 is provided with a low-pressure turbine bypass 4 in parallel for switching on and off the low-pressure turbine, when the load is lower, the heating extraction pressure is lower, and if the extraction steam of the low-pressure turbine does not meet the power steam parameter requirement of the steam ejector, the low-pressure turbine bypass 4 is opened at the moment, and the heating extraction steam is directly injected to the turbine for steam exhaust; when the return water temperature of the heat supply network is lower, the unit can selectively not improve the exhaust pressure, ensure the output of the low-pressure cylinder, inject the exhaust steam of the steam turbine through the steam injector, realize the waste heat recovery and ensure the output of the generator of the unit; if the return water temperature of the heat supply network is higher, the back pressure of the unit can be improved, and the steam ejector and the low-pressure steam turbine are simultaneously put into the unit, so that three-stage heating of steam and cascade utilization of excess pressure are realized.
Claims (4)
1. A system for utilizing waste heat of a straight condensing-modified heat supply air cooling unit comprises a medium pressure cylinder (1) and a low pressure cylinder (2) which are sequentially arranged on an exhaust pipeline of a coal-fired unit and used for heating and air extraction, wherein a steam outlet pipeline of the low pressure cylinder (2) is connected with a heat supply network heater used for heating heat supply network water; the method is characterized in that: a low-pressure turbine (5) is arranged on a heating steam extraction pipeline of the intermediate pressure cylinder (1), an asynchronous generator (6) for steam power generation is communicated with the low-pressure turbine (5), a steam ejector (7) for heat exchange is arranged on a steam exhaust pipeline of the low-pressure turbine (5), and a steam outlet pipeline of the steam ejector (7) is connected to a heat supply network heater; the heating network heater is connected with a heating network for heat supply through a heating network water supply pipeline (10), and the return water of the heating network is respectively connected with the water inlet ends of the heating network heat exchanger and the air cooling island (13) through a heating network return water pipeline (12).
2. The residual pressure and waste heat utilization system of the straight condensing-modified hot air cooling unit as claimed in claim 1, wherein: and the low-pressure cylinder (2) is connected with a generator (3) for generating electricity.
3. The residual pressure and waste heat utilization system of the straight condensing-modified hot air cooling unit as claimed in claim 1, wherein: the heating network heater comprises a first-stage heating network heater (11), a second-stage heating network heater (8) and a third-stage heating network heater (9) which are connected in series, wherein a steam inlet end of the first-stage heating network heater (11) is connected to a steam outlet end of the low-pressure cylinder (2), a steam inlet end of the second-stage heating network heater (8) is connected to a steam outlet end of the steam ejector (7), a steam inlet end of the third-stage heating network heater (9) is connected to a heating steam extraction pipeline of the medium-pressure cylinder (1), a steam outlet end of the third-stage heating network heater (9) is connected to a steam inlet end of the second-stage heating network heater (8), a steam outlet end of the second-stage heating network heater (8) is connected to a steam inlet end of the first-stage heating network heater (11), and a steam outlet end of the first-stage heating network heater is connected to a steam inlet end of the air cooling island (13).
4. The residual pressure and waste heat utilization system of the straight condensing-modified hot air cooling unit as claimed in claim 1, wherein: and a low-pressure turbine bypass (4) for switching on and off the low-pressure turbine is arranged on the low-pressure turbine (5) in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120983369.4U CN215333021U (en) | 2021-05-10 | 2021-05-10 | Residual pressure and waste heat utilization system for heat supply air cooling unit changed from straight condensing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120983369.4U CN215333021U (en) | 2021-05-10 | 2021-05-10 | Residual pressure and waste heat utilization system for heat supply air cooling unit changed from straight condensing |
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| CN215333021U true CN215333021U (en) | 2021-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264565A (en) * | 2022-07-25 | 2022-11-01 | 西安西热节能技术有限公司 | Low-pressure cylinder zero-output unit waste heat deep recovery optimized heating system |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264565A (en) * | 2022-07-25 | 2022-11-01 | 西安西热节能技术有限公司 | Low-pressure cylinder zero-output unit waste heat deep recovery optimized heating system |
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Address after: 050000 12th floor, Taifeng building, 172 Zhonghua South Street, Shijiazhuang, Hebei Patentee after: Hebei Jiantou energy science and Technology Research Institute Co.,Ltd. Address before: 050000 12th floor, Taifeng building, 172 Zhonghua South Street, Shijiazhuang, Hebei Patentee before: HEBEI JI-YAN ENERGY SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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