CN219974589U - Steam turbine unit exhaust steam utilization system - Google Patents
Steam turbine unit exhaust steam utilization system Download PDFInfo
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- CN219974589U CN219974589U CN202320964158.5U CN202320964158U CN219974589U CN 219974589 U CN219974589 U CN 219974589U CN 202320964158 U CN202320964158 U CN 202320964158U CN 219974589 U CN219974589 U CN 219974589U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 239000000498 cooling water Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 7
- 239000002918 waste heat Substances 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model discloses a steam turbine unit exhaust steam utilization system, which comprises an exhaust steam condenser; the exhaust steam outlet of the middle pressure cylinder of the steam turbine is communicated with the working fluid inlet of the hot press and the steam inlet of the heating network heater through pipelines, and the mixed fluid outlet of the hot press is communicated with the steam inlet of the condenser of the steam booster; the heat supply network circulating water pipeline is sequentially communicated with a water pipe of the exhaust steam condenser, a water pipe of the steam adding machine condenser and a water pipe of the heat supply network heater. The advantages are that: three-stage cascade heating is carried out on the heat supply network circulating water by utilizing the extraction steam of the main steam turbine, and the waste heat of the dead steam is reasonably recycled, so that the reduction of the power generation standard coal consumption in the heat supply period is facilitated; the external heating system is effectively separated from the indirect cooling circulation system, so that the pollution of the circulating cooling water of the surface condenser caused by the water quality of the circulating water of the heat supply network is effectively avoided, the corrosion to the indirect cooling tower radiator is further avoided, and the service life of the indirect cooling tower radiator is prolonged.
Description
Technical field:
the utility model relates to the technical field of thermal power plant equipment, in particular to a steam turbine unit exhaust steam utilization system.
The background technology is as follows:
in steam thermodynamic cycles, it is common to draw a portion of the steam from several intermediate stages of the turbine, send it to a feedwater heater for heating the boiler feedwater, and use it in various plant streams, such as feedwater pump turbine streams, winter heating streams, etc.; part of exhaust steam extracted from a middle pressure cylinder of the steam turbine enters a low pressure cylinder to do work, exhaust steam after doing work is discharged into a surface condenser to exchange heat with circulating cooling water of an indirect cooling tower, the exhaust steam flows through a stainless steel pipe of the condenser to exchange surface heat with the circulating cooling water flowing in the pipe, and after the exhaust steam is condensed, the exhaust steam is pumped into a thermodynamic system for circulation by using condensation water; the circulating cooling water flowing in the pipe carries heat, the heat is boosted by the circulating pump and then is sent into the hot water ring pipe in the indirect cooling tower, and the hot water is sent into the air cooling radiating fins arranged around the indirect cooling tower for radiating by the hot water ring pipe.
In order to recover part of heat of exhaust steam discharged into the surface condenser by the low-pressure cylinder, heat supply network circulating water is usually directly pumped into the surface condenser to exchange heat with the exhaust steam, and part of heat of the exhaust steam is recovered; however, according to multiple places of operation experience, the quality of the heat supply network circulating water is poor, and especially during the initial operation period, impurities such as sediment are mixed in the heat supply network circulating water, if the heat supply network circulating water is directly switched to use the surface condenser, the quality of the heat supply network circulating water can cause pollution of the circulating cooling water of the surface condenser, and further serious corrosion can be caused to the indirect cooling tower radiator, so that the service life is shortened.
In addition, the heat supply network circulating water pump is high-power equipment of a heat website, and the driving mode is usually driven by adopting a motor, but the following problems exist in the conventional motor driving mode: (1) The motor of the heat supply network circulating water pump has higher power, and the 10kV high-voltage motor has high cost; (2) When the motor operates, the station service power rate is higher, and the economic operation index of the power plant is influenced; (3) The starting current of the motor is larger, and the impact on electrical equipment is larger; (4) When the motor is connected with the circulating water pump, a speed reducer is required to be added, additional fault points are added, the occupied space is large, and the maintenance of the unit is inconvenient.
The utility model comprises the following steps:
the utility model aims to provide a steam turbine unit exhaust steam utilization system which is beneficial to prolonging the service life of a cooling tower radiator and reducing the economic operation index of a power plant.
The utility model is implemented by the following technical scheme: a steam turbine unit exhaust steam utilization system comprises a steam turbine medium pressure cylinder, a steam turbine low pressure cylinder, a surface condenser, a heat supply network circulating water pipeline and an indirect cooling tower; the exhaust steam outlet of the turbine medium pressure cylinder is communicated with the steam inlet of the turbine low pressure cylinder, and the exhaust steam outlet of the turbine low pressure cylinder is communicated with the steam inlet of the surface condenser; the indirect cooling tower is communicated with a circulating water pipe in the surface condenser through a circulating cooling water pipeline, and a cooling water pump is arranged on the circulating cooling water pipeline; the device also comprises a dead steam condenser, a hot press, a steam adding machine condenser and a heating network heater; the steam inlet of the surface condenser is communicated with the steam inlet of the exhaust steam condenser and the injection fluid inlet of the hot press through pipelines, the exhaust steam outlet of the middle pressure cylinder of the steam turbine is communicated with the working fluid inlet of the hot press and the steam inlet of the heat supply network heater through pipelines, and the mixed fluid outlet of the hot press is communicated with the steam inlet of the steam booster condenser; the heat supply network circulating water pipeline is sequentially communicated with the water pipe of the exhaust steam condenser, the water pipe of the steam-increasing machine condenser and the water pipe of the heat supply network heater, and a heat supply network circulating water pump is installed at the heat supply network circulating water inlet of the exhaust steam condenser.
Further, the system also comprises a back pressure turbine, and an output shaft of the back pressure turbine is connected with the heat supply network circulating water pump through a coupler.
Further, a dead steam outlet of the middle pressure cylinder of the steam turbine is communicated with a steam inlet of the back pressure steam turbine, and a back pressure steam outlet of the back pressure steam turbine is communicated with a steam inlet of the heat supply network heater.
The utility model has the advantages that: according to the utility model, three-stage cascade heating is carried out on the heat supply network circulating water by utilizing the extraction steam of the main steam turbine, and the waste heat of the exhaust steam is reasonably recycled, so that the waste is avoided, and the reduction of the power generation standard coal consumption in the heat supply period is facilitated; in addition, the utility model effectively separates the external heating system from the indirect cooling circulation system, leads out part of exhaust steam of the low-pressure cylinder of the steam turbine to the exhaust steam condenser for heat exchange with the heat supply network circulating water, and does not lead the heat supply network circulating water into the surface condenser, thereby effectively avoiding the pollution of the circulating cooling water of the surface condenser caused by the water quality of the heat supply network circulating water, further avoiding the corrosion to the indirect cooling tower radiator and prolonging the service life of the indirect cooling tower radiator.
Description of the drawings:
fig. 1 is a schematic structural view of the present utility model.
The components in the drawings are marked as follows: the system comprises a turbine medium pressure cylinder 1, a turbine low pressure cylinder 2, a surface condenser 3, a heat supply network circulating water pipeline 4, an indirect cooling tower 5, a circulating cooling water pipeline 6, a cooling water pump 7, a dead steam condenser 8, a hot press 9, a steam booster condenser 10, a heat supply network heater 11, a heat supply network circulating water pump 12 and a back pressure turbine 13.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the embodiment provides a steam turbine unit exhaust steam utilization system, which comprises a steam turbine medium pressure cylinder 1, a steam turbine low pressure cylinder 2, a surface condenser 3, a heat supply network circulating water pipeline 4 and an indirect cooling tower 5; the exhaust steam outlet of the turbine intermediate pressure cylinder 1 is communicated with the steam inlet of the turbine low pressure cylinder 2, and the exhaust steam outlet of the turbine low pressure cylinder 2 is communicated with the steam inlet of the surface condenser 3; the indirect cooling tower 5 is communicated with a circulating water pipe in the surface condenser 3 through a circulating cooling water pipeline 6, and a cooling water pump 7 is arranged on the circulating cooling water pipeline 6; and part of exhaust steam discharged into the surface condenser 3 exchanges heat with circulating cooling water discharged from the indirect cooling tower 5, and the heat is brought into the indirect cooling tower 5 for heat dissipation.
The device also comprises a dead steam condenser 8, a hot press 9, a steam adding machine condenser 10 and a heating network heater 11; the steam inlet of the surface condenser 3 is communicated with the steam inlet of the exhaust steam condenser 8 and the injection fluid inlet of the hot press 9 through pipelines, the exhaust steam outlet of the pressure cylinder 1 in the steam turbine is communicated with the working fluid inlet of the hot press 9 and the steam inlet of the heat supply network heater 11 through pipelines, and the mixed fluid outlet of the hot press 9 is communicated with the steam inlet of the booster condenser 10; the heat supply network circulating water pipeline 4 is sequentially communicated with a water pipe of the exhaust steam condenser 8, a water pipe of the steam-increasing machine condenser 10 and a water pipe of the heat supply network heater 11, and a heat supply network circulating water pump 12 is arranged at a heat supply network circulating water inlet of the exhaust steam condenser 8; a part of exhaust steam is led out from the low-pressure cylinder 2 of the steam turbine to the exhaust steam condenser 8, the heat supply network circulating water backwater is preheated, the waste heat recovery and the utilization of the part of exhaust steam are realized, the temperature of the heat supply network circulating water backwater is 52 ℃, and the temperature after preheating and heating is 70.7 ℃; the exhaust steam extracted from the turbine medium pressure cylinder 1 is taken as a high-temperature and high-pressure working fluid to enter a hot press 9, and simultaneously, under the action of pressure difference, the exhaust steam extracted from the turbine low pressure cylinder 2 is introduced from an injection fluid inlet of the hot press 9 and is mixed with the exhaust steam extracted from the turbine medium pressure cylinder 1 in a mixing chamber of the hot press 9, and the mixed exhaust steam enters a steam-increasing condenser 10 to continuously heat supply network circulating water to 79.2 ℃; then the waste steam directly extracted by the middle pressure cylinder 1 of the steam turbine heats the heat supply network circulating water to 112.5 ℃ in the heat supply network heater 11 to supply heat to the outside; therefore, the utility model utilizes the extraction steam of the main turbine to perform three-stage cascade heating on the heat supply network circulating water, namely, the extraction steam of the low-pressure cylinder 2 of the turbine performs one-stage heating on the heat supply network circulating water in the exhaust steam condenser 8, the mixed steam of the extraction steam of the low-pressure cylinder 2 of the turbine and the extraction steam of the medium-pressure cylinder 1 of the turbine performs two-stage heating on the heat supply network circulating water in the steam-increasing condenser 10, the extraction steam of the medium-pressure cylinder 1 of the turbine performs three-stage heating on the heat supply network circulating water in the heat supply network heater 11, thereby reasonably recycling the exhaust steam waste heat, avoiding waste and being beneficial to reducing the power generation standard coal consumption in the heating period; in addition, the utility model effectively separates an external heating system from an indirect cooling circulation system, leads out part of exhaust steam of the low-pressure cylinder 2 of the steam turbine to the exhaust steam condenser 8 for heat exchange with the heat supply network circulating water, and does not lead the heat supply network circulating water into the surface condenser 3, thereby effectively avoiding the pollution of the circulating cooling water of the surface condenser 3 caused by the water quality of the heat supply network circulating water, further avoiding the corrosion to the radiator of the indirect cooling tower 5 and prolonging the service life of the indirect cooling tower 5.
The system also comprises a back pressure turbine 13, wherein an output shaft of the back pressure turbine 13 is connected with a heat supply network circulating water pump 12 through a coupling, a speed reducer is not required to be arranged, fault points are reduced, occupied space is occupied, and the back pressure turbine 13 with the same power is smaller than a motor in external dimension according to actual investigation on site; the exhaust steam outlet of the turbine intermediate pressure cylinder 1 is communicated with the steam inlet of the back pressure turbine 13, and the back pressure steam outlet of the back pressure turbine 13 is communicated with the steam inlet of the heat supply network heater 11; the driving steam of the back pressure turbine 13 is extracted from a middle pressure cylinder of the main turbine, namely, the middle pressure cylinder 1 of the turbine extracts steam, the exhaust temperature of the back pressure turbine 13 reaches 160 ℃, and the heat supply network heater 11 is introduced to heat the heat supply network circulating water, so that the exhaust waste heat of the back pressure turbine 13 is reasonably utilized.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (3)
1. A steam turbine unit exhaust steam utilization system comprises a steam turbine medium pressure cylinder, a steam turbine low pressure cylinder, a surface condenser, a heat supply network circulating water pipeline and an indirect cooling tower; the exhaust steam outlet of the turbine medium pressure cylinder is communicated with the steam inlet of the turbine low pressure cylinder, and the exhaust steam outlet of the turbine low pressure cylinder is communicated with the steam inlet of the surface condenser; the indirect cooling tower is communicated with a circulating water pipe in the surface condenser through a circulating cooling water pipeline, and a cooling water pump is arranged on the circulating cooling water pipeline;
the device is characterized by further comprising a dead steam condenser, a hot press, a steam turbine condenser and a heating network heater; the steam inlet of the surface condenser is communicated with the steam inlet of the exhaust steam condenser and the injection fluid inlet of the hot press through pipelines, the exhaust steam outlet of the middle pressure cylinder of the steam turbine is communicated with the working fluid inlet of the hot press and the steam inlet of the heat supply network heater through pipelines, and the mixed fluid outlet of the hot press is communicated with the steam inlet of the steam booster condenser; the heat supply network circulating water pipeline is sequentially communicated with the water pipe of the exhaust steam condenser, the water pipe of the steam-increasing machine condenser and the water pipe of the heat supply network heater, and a heat supply network circulating water pump is installed at the heat supply network circulating water inlet of the exhaust steam condenser.
2. The exhaust steam utilization system of a steam turbine unit according to claim 1, further comprising a back pressure steam turbine, wherein an output shaft of the back pressure steam turbine is connected with the heat supply network circulating water pump through a coupling.
3. The steam turbine unit exhaust steam utilization system of claim 2, wherein the exhaust steam outlet of the steam turbine intermediate pressure cylinder is in communication with the steam inlet of the back pressure steam turbine, and the back pressure steam outlet of the back pressure steam turbine is in communication with the steam inlet of the heat supply network heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320964158.5U CN219974589U (en) | 2023-04-24 | 2023-04-24 | Steam turbine unit exhaust steam utilization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320964158.5U CN219974589U (en) | 2023-04-24 | 2023-04-24 | Steam turbine unit exhaust steam utilization system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219974589U true CN219974589U (en) | 2023-11-07 |
Family
ID=88592548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320964158.5U Active CN219974589U (en) | 2023-04-24 | 2023-04-24 | Steam turbine unit exhaust steam utilization system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219974589U (en) |
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2023
- 2023-04-24 CN CN202320964158.5U patent/CN219974589U/en active Active
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