CN110056403B - Extraction back pressure heating type steam turbine connected with exhaust steam recovery system - Google Patents
Extraction back pressure heating type steam turbine connected with exhaust steam recovery system Download PDFInfo
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- CN110056403B CN110056403B CN201910354704.1A CN201910354704A CN110056403B CN 110056403 B CN110056403 B CN 110056403B CN 201910354704 A CN201910354704 A CN 201910354704A CN 110056403 B CN110056403 B CN 110056403B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses an extraction back pressure heating type steam turbine connected with an exhaust recovery system and a using method thereof, belonging to the technical field of extraction back pressure heating type steam turbines which can be operated in both heating seasons and non-heating seasons. The invention relates to an extraction back pressure heating type steam turbine connected with an extraction steam recovery system, which comprises an extraction back pressure steam turbine and an extraction steam recovery system, wherein the extraction steam recovery system comprises a heat exchanger, a steam outlet of the extraction back pressure steam turbine is communicated with a steam inlet of the heat exchanger through a steam outlet pipeline, a first valve is assembled on the steam outlet pipeline, a heating steam supply pipeline is communicated on the steam outlet pipeline on the upstream side of the first valve, and a second valve is assembled on the heating steam supply pipeline. When the steam extraction back pressure steam turbine is adopted, the steam extraction back pressure steam turbine can normally operate no matter in heating seasons or non-heating seasons, the industrial steam supply requirement is met, and the utilization rate of the steam extraction back pressure steam turbine can be improved.
Description
Technical Field
The invention relates to an extraction back pressure heating type steam turbine connected with an exhaust recovery system and a using method thereof, belonging to the technical field of extraction back pressure heating type steam turbines which can be operated in both heating seasons and non-heating seasons.
Background
The extraction back pressure heating steam turbine refers to an extraction back pressure steam turbine, the extraction steam of which goes to industrial steam, and the exhaust steam goes to heating steam.
In the heating season, the steam extraction back pressure turbine has industrial steam supply heat load and heating steam supply heat load at the same time, and can normally operate.
Because heating is seasonal, although industrial steam supply heat load still exists in non-heating seasons, the requirement of the heating steam supply heat load becomes zero, and the steam extraction back pressure turbine does not exhaust steam, so that the steam extraction back pressure turbine cannot operate, the steam extraction back pressure turbine can only be stopped for a long time in the non-heating seasons, the industrial steam supply requirement cannot be realized, and the waste of equipment resources is caused.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides the extraction back pressure heating type steam turbine connected with the exhaust recovery system.
The technical scheme adopted by the invention is as follows:
the utility model provides an extraction backpressure heating formula steam turbine with exhaust recovery system, includes extraction backpressure formula steam turbine, still includes exhaust recovery system, exhaust recovery system includes the heat exchanger, and the steam extraction mouth of extraction backpressure formula steam turbine passes through the steam admission mouth intercommunication of steam exhaust pipeline and heat exchanger, is equipped with first valve on the steam exhaust pipeline, and the intercommunication has the heating to supply the steam pipeline on the steam exhaust pipeline of first valve upper reaches side, is equipped with the second valve on the heating supplies the steam pipeline.
When the invention is adopted, the main steam inlet pipeline is communicated with the steam extraction back-pressure steam turbine, the industrial steam extraction port of the steam extraction back-pressure steam turbine is communicated with the industrial steam extraction pipeline, the steam extraction back-pressure steam turbine is provided with an industrial steam extraction regulating part for regulating the industrial steam extraction amount, so that high-temperature steam from a boiler enters the steam extraction back-pressure steam turbine through the main steam inlet pipeline, and the industrial steam extraction is conveyed to a factory user needing the high-temperature steam from the industrial steam extraction pipeline; in the heating season, the first valve is closed, the second valve is opened, the exhaust steam of the steam extraction back pressure turbine enters a heating steam supply pipeline for heating, and the steam extraction back pressure turbine can normally operate; and in non-heating seasons, the first valve is opened, the second valve is closed, the exhaust steam of the steam extraction back pressure turbine enters the heat exchanger of the exhaust steam recovery system for heat exchange, and the steam extraction back pressure turbine can also normally operate. Therefore, no matter in the heating season or the non-heating season, the steam extraction back pressure turbine can normally operate, the industrial steam supply requirement is met, and the utilization rate of the steam extraction back pressure turbine is improved. In non-heating seasons, after heat exchange is carried out between exhaust steam entering a heat exchanger and low-temperature water entering the heat exchanger (the low-temperature water entering the heat exchanger is hereinafter referred to as inlet low-temperature water), the low-temperature water is changed into high-temperature water and then flows out of the heat exchanger (the high-temperature water flowing out of the heat exchanger is hereinafter referred to as outlet high-temperature water); meanwhile, the discharged steam is changed into discharged steam condensate water (or saturated water) after heat exchange in the heat exchanger, and the outlet high-temperature water and the discharged steam condensate water can be conveyed to a regenerative system, a boiler water supply system or other places with requirements, so that the heat energy of the discharged steam can be effectively utilized, and the energy is saved.
Preferably, the first valve and the second valve are both stop valves.
Optionally, an overflow pipeline is communicated with the steam exhaust pipeline at the downstream side of the first stop valve, and a third valve is communicated with the overflow pipeline. The purpose of this design lies in: when the exhaust steam recovery system is just put into use or the steam extraction back pressure turbine has variable working conditions, the heat exchange between the exhaust steam of the steam extraction back pressure turbine and the low-temperature water entering the heat exchanger does not reach balance or the balance is damaged; at the moment, the third valve can be opened and adjusted, the steam discharge amount entering the heat exchanger is adjusted under the overflow effect of the overflow pipeline, so that the heat exchange between the low-temperature water entering the heat exchanger and the discharged steam gradually reaches a balance state, and after the balance state is reached, the third valve is closed, and the overflow pipeline does not overflow any more.
Preferably, the third valve is a regulating valve.
Optionally, the heat exchanger is a surface heat exchanger, a hybrid heat exchanger or a low-pressure heater.
Optionally, the water inlet of the heat exchanger is communicated with a water inlet pipeline, the water outlet of the heat exchanger is communicated with a water outlet pipeline, the vapor outlet of the heat exchanger is connected with a vapor-liquid outlet of the heat exchanger, and the vapor-liquid outlet of the heat exchanger is communicated with a vapor-liquid outlet condensed water pipeline. So that the steam-discharging condensed water and the high-temperature water at the outlet are converged and jointly conveyed to a required place. The low-temperature water entering from the water inlet pipeline can be low-temperature water sources such as steam extraction condensed water and the like. If the water pressure of the steam discharging condensed water is greater than that of the outlet high-temperature water, the steam discharging condensed water can flow to the outlet high-temperature water; however, if the water pressure of the exhaust steam condensate is less than that of the outlet high-temperature water, the exhaust steam condensate cannot flow to the outlet high-temperature water; therefore, it is preferable that the drain pump is provided in the exhaust steam condensate pipe line so that the exhaust steam condensate can be converged to the outlet high-temperature water regardless of the water pressure of the exhaust steam condensate compared with the water pressure of the outlet high-temperature water.
A use method of an extraction back pressure heating steam turbine connected with an exhaust recovery system comprises the steps that in a heating season, a first valve is closed, a second valve is opened, and exhaust steam of the extraction back pressure steam turbine enters a heating steam supply pipeline for heating; and in non-heating seasons, the first valve is opened, the second valve is closed, and the exhaust steam of the steam extraction back pressure turbine enters the heat exchanger for heat exchange.
Optionally, in non-heating seasons, the actual exhaust steam quantity of the steam extraction back pressure turbine is 10% -20% of the designed exhaust steam quantity. On the premise of ensuring the normal operation of the steam extraction back pressure turbine, the consumption of the low-temperature water at the inlet can be effectively reduced. The principle is as follows: the exhaust steam quantity of the extraction back pressure turbine needs to be completely condensed into water, and a corresponding amount of inlet low-temperature water is needed. Therefore, if the exhaust steam amount is larger, more inlet low-temperature water is required. In practical engineering application, a large amount of low-temperature water sources which can be heated do not necessarily exist, so that the steam discharge is reduced to a very low state (for example, the actual steam discharge of the steam extraction back pressure turbine is 10% -20% of the designed steam discharge) on the premise of ensuring the safe operation of the steam extraction back pressure turbine in non-heating seasons, and the method has great engineering application value and great engineering application significance.
Optionally, in non-heating seasons, the exhaust steam pressure of the steam extraction back pressure turbine is slightly higher than the ambient atmospheric pressure. The purpose of this design lies in: the negative pressure air suction of the cylinder of the steam extraction back pressure steam turbine can not be caused, and the specific volume of the exhausted steam can be effectively increased, so that the safety of the last-stage blade of the steam turbine of the steam extraction back pressure steam turbine in a small exhaust steam quantity state is improved.
Preferably, the exhaust pressure of the steam extraction back pressure turbine is 0.11MPa-0.15MPa in non-heating seasons.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the extraction back pressure heating type steam turbine connected with the exhaust steam recovery system and the use method thereof have the advantages that the design is ingenious, equipment and energy can be fully utilized, and the engineering application value is high; when the invention is adopted, the steam extraction back pressure turbine can normally operate no matter in the heating season or the non-heating season, and the industrial steam supply requirement is met; in the heating season, the exhaust steam of the steam extraction back pressure turbine enters a heating steam supply pipeline for heating; in non-heating seasons, the exhausted steam of the steam extraction back pressure turbine enters the heat exchanger for heat exchange; this improves the utilization of the extraction back-pressure turbine.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic design diagram of the present invention, in which a portion in a two-dot chain line block indicates an exhaust steam recovery system, and a portion in a two-dot chain line block indicates an extraction back pressure heating steam turbine.
The labels in the figure are: 1-extraction back pressure turbine, 2-heat exchanger, 3-main steam inlet pipeline, 4-industrial steam extraction pipeline, 41-industrial steam extraction regulating part, 5-steam exhaust pipeline, 51-first valve, 6-heating steam supply pipeline, 61-second valve, 7-overflow pipeline, 71-third valve, 81-water inlet pipeline, 82-water outlet pipeline, 9-steam outlet condensation water pipeline and 91-drainage pump.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
As shown in fig. 1, the extraction back pressure heating steam turbine connected with the extraction steam recovery system of the embodiment includes an extraction back pressure steam turbine 1 and further includes an extraction steam recovery system, the extraction steam recovery system includes a heat exchanger 2, the steam outlet of the extraction back pressure steam turbine 1 is communicated with the steam inlet of the heat exchanger 2 through a steam outlet pipeline 5, a first valve 51 is assembled on the steam outlet pipeline 5, a heating steam supply pipeline 6 is communicated on the steam outlet pipeline 5 on the upstream side of the first valve 51, and a second valve 61 is assembled on the heating steam supply pipeline 6.
When the invention is adopted, the main steam inlet pipeline 3 is communicated with the steam extraction back-pressure steam turbine 1, the industrial steam extraction opening of the steam extraction back-pressure steam turbine 1 is communicated with the industrial steam extraction pipeline 4, and the steam extraction back-pressure steam turbine 1 is provided with an industrial steam extraction adjusting part 41 for adjusting the industrial steam extraction amount (the industrial steam extraction adjusting part 41 can be an industrial steam extraction adjusting valve or an industrial steam extraction rotating partition plate and other industrial steam extraction adjusting parts), so that high-temperature steam from a boiler enters the steam extraction back-pressure steam turbine 1 through the main steam inlet pipeline 3. In the heating season, the first valve 51 is closed, and the second valve 61 is opened; adjusting an industrial extraction regulating valve to a required reasonable opening degree, extracting a part of steam of the extraction back-pressure steam turbine 1, and conveying the part of industrial extraction steam to a factory user needing high-temperature steam from an industrial extraction pipeline 4; and the exhaust steam of the steam extraction back pressure turbine 1 enters a heating steam supply pipeline 6 for heating. In the non-heating season, the first valve 51 is opened, and the second valve 61 is closed; adjusting the industrial extraction regulating valve to the minimum opening (so as to maximize the extraction amount), extracting most steam of the extraction back-pressure steam turbine 1, and conveying most industrial extraction steam from the industrial extraction pipeline 4 to a factory user needing high-temperature steam; and the rest small part of steam continues to expand and work in the steam back pressure turbine 1, the exhaust pressure is set to be slightly higher than the ambient atmospheric pressure (for example, the exhaust pressure is 0.11MPa-0.15 MPa), and the exhaust steam of the steam extraction back pressure turbine 1 enters a heat exchanger 2 of an exhaust steam recovery system for heat exchange. No matter in heating season or non-heating season, the steam extraction back pressure turbine can normally operate, industrial steam supply requirements are met, and therefore the utilization rate of the steam extraction back pressure turbine 1 is improved. In non-heating seasons, after heat exchange is performed between exhaust steam entering the heat exchanger 2 and low-temperature water entering the heat exchanger 2 (the low-temperature water entering the heat exchanger 2 is hereinafter referred to as inlet low-temperature water), the low-temperature water changes into high-temperature water and then flows out of the heat exchanger 2 (the high-temperature water flowing out of the heat exchanger 2 is hereinafter referred to as outlet high-temperature water); meanwhile, the exhaust steam is changed into exhaust steam condensate water (or saturated water) after heat exchange is carried out in the heat exchanger 2, the outlet high-temperature water and the exhaust steam condensate water can be conveyed to a regenerative system, a boiler water supply system or other places with requirements, the heat energy of the exhaust steam can be effectively utilized, and energy is saved.
Preferably, in another embodiment, the first valve 51 and the second valve 61 are both stop valves.
Alternatively, in another embodiment, the steam exhaust line 5 on the downstream side of the first stop valve 51 is communicated with an overflow line 7, and the overflow line 7 is communicated with a third valve 71. The purpose of this design lies in: when the exhaust steam recovery system is just put into use or the steam extraction back pressure turbine 1 has a variable working condition, the heat exchange between the exhaust steam of the steam extraction back pressure turbine 1 and the low-temperature water entering the heat exchanger 2 is not balanced or the balance is damaged; at this time, the amount of the exhaust steam entering the heat exchanger 2 is adjusted by opening and adjusting the third valve 71 under the overflow action of the overflow line 7, so that the heat exchange between the low-temperature water entering the heat exchanger 2 and the exhaust steam gradually reaches a balanced state, and after the balanced state is reached, the third valve 71 is closed, and the overflow line 7 does not overflow any more.
Preferably, in another embodiment, the third valve 71 is a regulating valve.
Compared with an adjusting valve, the stop valve is mainly used for switching on and off media, and can also be used for adjusting the flow of the media, but the adjustment precision is poor, and the adjustment is inconvenient; the regulating valve is mainly used for regulating medium flow, has high regulating precision and convenient regulation, and also has the function of switching on and off the medium; regulating valves are more expensive than shut-off valves. Therefore, according to the actual use requirement, the first valve 51 and the second valve 61 are both stop valves, and the third valve 71 is a regulating valve, which is an optimal preferred design. Of course, the first valve 51 and the second valve 61 may be both regulating valves, but this increases the cost, and is not necessary; the third valve 71 may also be a shut-off valve, but this has the consequence that it is difficult to regulate the flow accurately, which is undesirable for use. Therefore, the first valve 51 and the second valve 61 are both shut-off valves, and the third valve 71 is optimally designed as a regulator valve.
Alternatively, in another embodiment, the heat exchanger 2 is a surface heat exchanger, a hybrid heat exchanger, or a low pressure heater.
Alternatively, in another embodiment, the water inlet of the heat exchanger 2 is communicated with a water inlet pipeline 81, the water outlet of the heat exchanger 2 is communicated with a water outlet pipeline 82, the vapor outlet of the heat exchanger 2 is connected with a vapor outlet condensed water outlet pipeline 9, and the vapor outlet condensed water outlet pipeline 9 is communicated to the water outlet pipeline 82. So that the steam-discharging condensed water and the high-temperature water at the outlet are converged and jointly conveyed to a required place. The low-temperature water entering from the water inlet pipe 81 may be low-temperature water source such as steam extraction condensate water. If the water pressure of the steam discharging condensed water is greater than that of the outlet high-temperature water, the steam discharging condensed water can flow to the outlet high-temperature water; however, if the water pressure of the exhaust steam condensate is less than that of the outlet high-temperature water, the exhaust steam condensate cannot flow to the outlet high-temperature water; therefore, it is preferable that the steam discharge condensate pipe 9 is equipped with a drain pump 91 so that the steam discharge condensate can be caused to flow together with the outlet high-temperature water regardless of the water pressure of the steam discharge condensate as compared with the water pressure of the outlet high-temperature water. When the heat exchanger 2 is a surface heat exchanger or a low-pressure heater, the design of the drain pump 91 is preferably combined; when the heat exchanger 2 is a hybrid heat exchanger, the design of the drain pump 91 is not combined.
Example two
Based on the design of the first embodiment, as shown in fig. 1, in the using method of the extraction back pressure heating steam turbine connected with the exhaust steam recovery system of the present embodiment, in the heating season, the first valve 51 is closed, the second valve 61 is opened, and the exhaust steam of the extraction back pressure steam turbine 1 enters the heating steam supply pipeline 6 for heating; in the non-heating season, the first valve 51 is opened, the second valve 61 is closed, and the exhaust steam of the extraction back-pressure turbine 1 enters the heat exchanger 2 for heat exchange. Please refer to the first embodiment for a detailed usage method.
Alternatively, in another embodiment, the actual exhaust steam amount of the extraction back-pressure turbine 1 is 10% to 20% of the design exhaust steam amount during non-heating seasons. On the premise of ensuring the normal operation of the steam extraction back pressure steam turbine 1, the consumption of the low-temperature water at the inlet can be effectively reduced. The principle is as follows: the exhaust steam quantity of the extraction back pressure turbine 1 needs to be completely condensed into water, and a corresponding amount of inlet low-temperature water is needed. Therefore, if the exhaust steam amount is larger, more inlet low-temperature water is required. In practical engineering application, a large amount of low-temperature water sources which can be heated do not necessarily exist, so that in non-heating seasons, on the premise that safe operation of the steam extraction back pressure turbine 1 can be guaranteed, the steam exhaust amount is reduced to a very low state, for example, the purpose of adjusting the steam exhaust amount is achieved through adjusting the opening degree of a steam extraction adjusting valve, the actual steam exhaust amount of the steam extraction back pressure turbine 1 is 10% -20% of the designed steam exhaust amount, and the method has a very high engineering application value and a high engineering application significance.
Alternatively, in another embodiment, the extraction back-pressure turbine 1 has a discharge pressure slightly higher than the ambient atmospheric pressure during non-heating seasons. The purpose of this design lies in: the negative pressure air suction of the cylinder of the steam extraction back pressure steam turbine can not be caused, and the specific volume of the exhausted steam can be effectively increased, so that the safety of the last-stage blade of the steam turbine of the steam extraction back pressure steam turbine in a small exhaust steam quantity state is improved.
Preferably, in another embodiment, the extraction back pressure turbine 1 has an extraction pressure of 0.11MPa to 0.15MPa during non-heating seasons.
In conclusion, the extraction back pressure heating type steam turbine connected with the exhaust recovery system and the use method thereof have the advantages of ingenious design, capability of fully utilizing equipment and energy and high engineering application value; when the invention is adopted, the steam extraction back pressure turbine can normally operate no matter in the heating season or the non-heating season, and the industrial steam supply requirement is met; in the heating season, the exhaust steam of the steam extraction back pressure turbine enters a heating steam supply pipeline for heating; in non-heating seasons, the exhausted steam of the steam extraction back pressure turbine enters the heat exchanger for heat exchange; this improves the utilization of the extraction back-pressure turbine.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (9)
1. The utility model provides an extraction backpressure heating formula steam turbine that is connected with exhaust recovery system, includes extraction backpressure formula steam turbine (1), its characterized in that: the system comprises a heat exchanger (2), a steam outlet of a steam extraction back-pressure steam turbine (1) is communicated with a steam inlet of the heat exchanger (2) through a steam exhaust pipeline (5), the steam exhaust pipeline (5) is provided with a first valve (51), the steam exhaust pipeline (5) on the upstream side of the first valve (51) is communicated with a heating steam supply pipeline (6), and the heating steam supply pipeline (6) is provided with a second valve (61);
in the heating season, the first valve (51) is closed, the second valve (61) is opened, and the exhaust steam of the steam extraction back pressure turbine (1) enters a heating steam supply pipeline (6) for heating;
in non-heating seasons, the first valve (51) is opened, the second valve (61) is closed, and the exhaust steam of the steam extraction back pressure turbine (1) enters the heat exchanger (2) for heat exchange; and the exhaust steam pressure of the steam extraction back pressure steam turbine (1) is slightly higher than the ambient atmospheric pressure.
2. The extraction back pressure heating steam turbine as claimed in claim 1, wherein: the first valve (51) and the second valve (61) are stop valves.
3. The extraction back pressure heating steam turbine as claimed in claim 1, wherein: an overflow pipeline (7) is communicated with the steam exhaust pipeline (5) at the downstream side of the first stop valve (51), and a third valve (71) is communicated with the overflow pipeline (7).
4. The extraction back pressure heating steam turbine as set forth in claim 3, wherein: the third valve (71) is a regulating valve.
5. The extraction back pressure heating steam turbine as claimed in claim 1, wherein: the heat exchanger (2) is a surface type heat exchanger, a mixed type heat exchanger or a low-pressure heater.
6. The extraction back pressure heating steam turbine as claimed in claim 1, wherein: a water inlet of the heat exchanger (2) is communicated with a water inlet pipeline (81), a water outlet of the heat exchanger (2) is communicated with a water outlet pipeline (82), a vapor outlet of the heat exchanger (2) is connected with a vapor-liquid outlet of the heat exchanger (9), and the vapor-liquid outlet of the heat exchanger (2) is communicated with the water outlet pipeline (82).
7. The extraction back pressure heating steam turbine as claimed in claim 6, wherein: a drain pump (91) is arranged on the exhaust steam condensation water pipeline (9).
8. The extraction back pressure heating steam turbine as claimed in claim 1, wherein: in non-heating seasons, the actual exhaust steam quantity of the steam extraction back pressure turbine (1) is 10% -20% of the designed exhaust steam quantity.
9. The extraction back pressure heating steam turbine as claimed in claim 1, wherein: in non-heating seasons, the exhaust pressure of the steam extraction back pressure turbine (1) is 0.11MPa-0.15 MPa.
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| CN112145244B (en) * | 2020-09-22 | 2023-02-24 | 西安热工研究院有限公司 | System and method for improving water supply temperature and steam supply capacity of coal-fired power generating unit |
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| CN106016416B (en) * | 2016-05-23 | 2018-11-09 | 华北电力大学 | The high back pressure co-generation unit that boiler smoke is coupled with exhaust steam in steam turbine |
| CN206458511U (en) * | 2017-02-16 | 2017-09-01 | 山西漳泽电力股份有限公司电力技术研究中心 | A kind of double mode therrmodynamic system of back pressure pure condensate and exhaust steam residual heat utilize system |
| CN107269331A (en) * | 2017-04-28 | 2017-10-20 | 华电电力科学研究院 | Realize cascaded utilization of energy and participate in the heat supply steam bleeding system and method for depth peak regulation |
| CN107542506B (en) * | 2017-08-23 | 2024-04-09 | 华电电力科学研究院有限公司 | Cascade utilization system for extraction condensing back of steam turbine and application thereof |
| CN207740056U (en) * | 2017-12-26 | 2018-08-17 | 华北电力大学 | A kind of CO2The machine furnace cooling of cycle can recycle and power generation and heat supply integral system |
| CN207934943U (en) * | 2018-02-11 | 2018-10-02 | 华电郑州机械设计研究院有限公司 | A kind of filling formula back pressure turbine heating system |
| CN208106512U (en) * | 2018-03-28 | 2018-11-16 | 国家电投集团科学技术研究院有限公司 | The exhaust steam residual heat circulatory system |
| CN108487952A (en) * | 2018-05-08 | 2018-09-04 | 中国华能集团清洁能源技术研究院有限公司 | A kind of steam high-grade energy-recuperation system and working method for realizing annual operation |
| CN208330475U (en) * | 2018-05-08 | 2019-01-04 | 中国华能集团清洁能源技术研究院有限公司 | A kind of steam high-grade energy recycling system for realizing annual operation |
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