CN218151092U - Thermal power plant steam turbine backpressure steam extraction energy cascade utilization system - Google Patents
Thermal power plant steam turbine backpressure steam extraction energy cascade utilization system Download PDFInfo
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- CN218151092U CN218151092U CN202222310597.2U CN202222310597U CN218151092U CN 218151092 U CN218151092 U CN 218151092U CN 202222310597 U CN202222310597 U CN 202222310597U CN 218151092 U CN218151092 U CN 218151092U
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Abstract
The utility model provides a steam turbine backpressure steam extraction energy cascade of thermal power plant utilizes system can the steam energy of recycle steam turbine steam extraction to moisturizing heater part, can effective energy saving. The utility model comprises a back pressure type main turbine, a water feeding pump, a water replenishing heater, a deaerator, a high pressure heater and a hot user; a water replenishing outlet of the water replenishing heater is connected with a water replenishing inlet of the deaerator; the water outlet of the deaerator is connected with the water inlet of the high-pressure heater through a water feed pump; the steam exhaust outlet of the back pressure type main turbine is connected with a hot user and a deaerator; the method is characterized in that: the system also comprises a generator and a small steam turbine; the steam outlet of the back pressure type main turbine is also connected with the steam inlet of the small turbine; the small steam turbine is connected with the generator and/or the water feeding pump; and the steam exhaust outlet of the small steam turbine is connected with the steam inlet of the water replenishing heater.
Description
Technical Field
The utility model relates to a steam turbine backpressure steam extraction energy step utilization system of thermal power plant.
Background
Under the background of a vision of 'carbon peak reaching and carbon neutralization', how to improve the comprehensive utilization efficiency of energy sources and realize energy conservation and emission reduction is particularly important. The thermal power plant is an important component in the field of energy at the present stage, and the optimization of the system of the thermal power plant realizes more reasonable energy gradient utilization, so that the comprehensive efficiency of the whole plant is improved, and the thermal power plant is important and worthy of continuing efforts.
In thermal power industry cogeneration field, to the great while relatively stable heat user of thermal load, in order to improve energy utilization, generally can set up back pressure steam turbine, through the external heat supply of steam turbine exhaust. The back pressure parameters of the back pressure turbine are generally converted into parameters of the steam outlet of the back pressure turbine according to the steam parameters required by a heat user. For a thermal power plant with cogeneration, in order to better realize the deoxidization effect, the desalted water serving as the make-up water needs to be heated by a water supplementing heater and then enters a deoxidization device for deoxidization and heating. For thermal power plants with higher thermal user parameters, heating steam of a deaerator and a water replenishing heater of the thermal power plants is heated by adopting steam exhausted by a back pressure machine. Because the steam exhaust pressure of the steam turbine is often higher than the heating steam pressure required by the water replenishing heater, the steam exhaust of the steam turbine generally needs to enter the water replenishing heater after being subjected to over-pressure reduction; this part of the energy utilization is wasted.
In order to save energy and better improve energy utilization efficiency, more and more thermal power plants adopt small turbines to drive water feeding pumps to replace traditional electric water feeding pumps, and on the basis, a plurality of relatively better thermal power plant energy cascade utilization systems and methods capable of realizing energy cascade utilization are provided, for example, a patent with publication number of CN 104989470A discloses a thermal power plant small turbine energy cascade utilization system and method.
For a thermal power plant with a water replenishing heater with sufficient steam quantity demand and heating steam energy level difference capable of stably driving a steam-driven water feeding pump, the method in the patent with publication number CN 104989470A can be adopted, and the steam exhaust of a small turbine of the water feeding pump is used for heating the water replenishing heater. However, for a high-temperature and ultrahigh-pressure thermal power generating unit with a small scale, the shaft power of the feed pump is high, the heating steam quantity of the water supplementing heater cannot meet the steam quantity required by driving or stably driving the feed pump, or the heating steam quantity of the water supplementing heater is larger than the steam quantity required by driving the feed pump. At this point, a new system and method is needed to recover the steam energy from the turbine exhaust to the make-up heater section.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a steam turbine backpressure steam extraction energy step utilization system of thermal power plant that structural design is reasonable, can the steam energy of recycle steam turbine steam extraction to moisturizing heater part, can effective energy saving.
The utility model provides a technical scheme that above-mentioned problem adopted is: a thermal power plant steam turbine backpressure steam exhaust energy gradient utilization system comprises a backpressure type main steam turbine, a water feeding pump, a water supplementing heater, a deaerator, a high-pressure heater and a heat consumer; a water replenishing outlet of the water replenishing heater is connected with a water replenishing inlet of the deaerator; the water outlet of the deaerator is connected with the water inlet of the high-pressure heater through a water feed pump; the steam exhaust outlet of the back pressure type main turbine is connected with a hot user and a deaerator; the method is characterized in that: the system also comprises a generator and a small steam turbine; the steam outlet of the back pressure type main turbine is also connected with the steam inlet of the small turbine; the small steam turbine is connected with the generator and/or the water feeding pump; and the steam exhaust outlet of the small steam turbine is connected with the steam inlet of the water replenishing heater.
The utility model discloses still include moisturizing heater heating steam conduit, the steam outlet of little steam turbine passes through moisturizing heater heating steam conduit and moisturizing heater's steam inlet to be connected.
The utility model discloses still include the demineralized water pipeline, the moisturizing export of moisturizing heater passes through the demineralized water pipeline and is connected with the moisturizing access of oxygen-eliminating device.
The utility model discloses still include hot user heat supply steam conduit, the steam extraction export of back pressure formula main steam turbine is connected with hot user through hot user heat supply steam conduit.
The utility model discloses still include oxygen-eliminating device heating steam conduit, the steam extraction export of back pressure type main steam turbine is connected with the oxygen-eliminating device through oxygen-eliminating device heating steam conduit.
The utility model discloses install deoxidization heating steam control valve on oxygen-eliminating device heating steam pipe.
The utility model discloses still include little steam turbine steam conduit, the steam outlet of back pressure type main steam turbine is connected with the steam inlet of little steam turbine through little steam turbine steam conduit.
The utility model discloses install little steam turbine entry governing valve on little steam turbine steam conduit.
Compared with the prior art, the utility model, have following advantage and effect: the structure is simple, the existing system is convenient to modify, the popularization and the application are convenient, and the market prospect is wide; after steam discharged by the back pressure type main turbine passes through the small turbine, the steam enters a water supplementing heater to heat demineralized water; according to the actual conditions of the heat load and the demineralized water supplementing quantity, the small steam engine is determined to drive the generator or the water feeding pump, or the generator and the water feeding pump are respectively driven, so that the heating steam energy is completely utilized, and the purpose of energy gradient is realized.
Drawings
Fig. 1 is a schematic structural diagram of the connection between the small steam turbine and the generator according to the embodiment of the present invention.
FIG. 2 is a schematic structural view of the connection between the small steam turbine and the feed pump according to the embodiment of the present invention.
FIG. 3 is a schematic structural diagram of the connection between the small steam turbine and the generator and the feed pump according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
The embodiment of the utility model provides an including boiler 1, back pressure type main turbine 2, feed pump 3, moisturizing heater heating steam conduit 4, moisturizing heater 5, oxygen-eliminating device 6, generator 7, high pressure feed water heater 8, hot user 9, main steam conduit 10, little steam turbine 11, oxygen-eliminating device heating steam conduit 12, deoxidization heating steam governing valve 13, hot user heating steam conduit 14, demineralized water pipeline 15, little steam turbine entry governing valve 16, high pressure water supply pipeline 17 and little steam turbine steam conduit 18.
The steam outlet of the boiler 1 is connected to the steam inlet of the main back-pressure turbine 2 via a main steam line 10.
And a water supplementing outlet of the water supplementing heater 5 is connected with a water supplementing inlet of the deaerator 6 through a demineralized water pipeline 15.
The water outlet of the deaerator 6 is connected with the water inlet of the high-pressure heater 8 through the water feeding pump 3. The water outlet of the high-pressure heater 8 is connected with the water inlet of the boiler 1 through a high-pressure water supply pipeline 17.
The steam exhaust outlet of the back pressure type main turbine 2 is connected with a hot user 9 through a hot user heat supply steam pipeline 14 on one way, is connected with a deaerator 6 through a deaerator heating steam pipeline 12 on one way, is provided with a deaerator heating steam regulating valve 13 on the deaerator heating steam pipeline 12, is connected with the steam inlet of a small turbine 11 through a small turbine steam pipeline 18 on one way, and is provided with a small turbine inlet regulating valve 16 on the small turbine steam pipeline 18.
The small turbine 11 is connected to the generator 7 and/or the feed pump 3.
The steam outlet of the small steam turbine 11 is connected with the steam inlet of the water replenishing heater 5 through the water replenishing heater heating steam pipeline 4.
1. As shown in fig. 1, when the amount of heated steam of the moisturizing heater 5 is smaller than the amount of steam required by the small steam turbine 11, the small steam turbine 11 is connected to the generator 7. After steam of the boiler 1 enters the back-pressure main turbine 2 through the main steam pipeline 10, the steam discharged by the back-pressure main turbine 2 is connected to a heat consumer 9 for external heat supply, and is connected to the deaerator 6 for deaerating and heating water, and is connected to the small turbine 11, and the small turbine 11 drives the generator 7 to generate electricity. The steam discharge of the small steam turbine 11 is connected to a water replenishing heater 5 to heat the demineralized water for replenishing.
For example, the main steam parameter of a certain thermal power plant I is 13.73MPaG,540 ℃, the external heating steam pressure is 0.98MPaG, the maximum heating load is 110t/h, the average heating load is 90t/h, and the minimum heating load is 50t/h. The rated flow of the feed pump is 150t/h, and the power of the feed pump shaft is about 1250kw. The fluctuation range of the heating heat load is large, and the shaft power of the small steam turbine driven by the steam quantity of the water replenishing heater under the condition of the maximum heat load is about 800kw. The heating steam amount cannot satisfy the steam amount required for driving the feed water pump. In this case, as shown in fig. 1, the energy of the steam heated by the makeup water heater can be recovered and utilized to realize the energy cascade utilization.
2. As shown in fig. 2, when the amount of heated steam of the makeup water heater 5 is equal to the amount of steam required by the small turbine 11, the small turbine 11 is connected to the feed pump 3. After steam of the boiler 1 enters the back-pressure main turbine 2 through a main steam pipeline, the steam discharged by the back-pressure main turbine 2 is connected to a heat consumer 9 for external heat supply, and is connected to the deaerator 6 for deaerating and heating water supply, and is connected to the small turbine 11, and the small turbine 11 drives the water supply pump 3 to supply water to the high-pressure heater 8. The steam discharge of the small steam turbine 11 is connected to a water replenishing heater 5 to heat the demineralized water for replenishing.
For example, the main steam parameter of a certain heat-engine plant II is 13.73MPaG, the temperature of 540 ℃, the external heating steam pressure is 0.98MPaG, the heating normal heat load is 180t/h, and the minimum heat load is 170t/h. The rated flow of the feed pump is 150t/h, and the power of the feed pump shaft is about 1250kw. The heating heat load is stable, and the load fluctuation range is small. The shaft power of the small turbine driven by the steam amount of the water replenishing heater under the normal heat load condition and the minimum heat load condition is respectively 1300kw and 1250kw. The heating steam amount satisfies the steam amount required for driving the feed pump. In this case, as shown in fig. 2, the energy of the steam heated by the make-up water heater can be recovered and utilized to realize the energy cascade utilization.
3. As shown in fig. 3, when the heating steam amount of the moisturizing heater 5 is larger than the steam amount required by the small turbine 11, the small turbine 11 is connected with the generator 7 and the feedwater pump 3. After steam of the boiler 1 enters the back-pressure main turbine 2 through a main steam pipeline, the steam exhaust of the back-pressure main turbine 2 is connected to a heat consumer 9 for external heat supply, is connected to the deaerator 6 for deaerating and heating water supply, and is connected to the small turbine 11, the small turbine 11 drives the generator 7 for power generation, and drives the water supply pump 3 to supply water to the high-pressure heater 8. The small steam turbine 11 is connected to a water replenishing heater 5 to heat the demineralized water for replenishing. In this case, two small turbines 11 may be provided to connect the generator 7 and the feed pump 3, respectively, or only one small turbine may be provided to drive both the generator 7 and the feed pump 3.
For example, in a third thermal power plant, the main steam parameter is 13.73MPaG, the temperature is 540 ℃, the external heating steam pressure is 0.98MPaG, the maximum heating load is 300t/h, the average heating load is 260t/h, and the minimum heating load is 230t/h. The rated flow of the feed pump is 150t/h, and the power of the feed pump shaft is about 1250kw. The fluctuation range of the heat supply load is large, the shaft power of the small steam turbine driven by the steam quantity of the water replenishing heater under the maximum heat load condition is about 2050kw, and the shaft power of the small steam turbine driven by the steam quantity of the water replenishing heater under the minimum heat load condition is about 1670kw. The heating steam quantity is larger than the steam quantity required for driving the water feeding pump. In this case, as shown in fig. 3, the energy of the steam heated by the makeup water heater can be recovered and utilized to realize the energy cascade utilization.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Those skilled in the art can modify or supplement the described embodiments or substitute them in a similar manner without departing from the scope of the invention as defined by the claims.
Claims (8)
1. A thermal power plant steam turbine backpressure steam exhaust energy gradient utilization system comprises a backpressure type main steam turbine, a water feeding pump, a water supplementing heater, a deaerator, a high-pressure heater and a heat consumer; a water replenishing outlet of the water replenishing heater is connected with a water replenishing inlet of the deaerator; the water outlet of the deaerator is connected with the water inlet of the high-pressure heater through a water feed pump; the steam exhaust outlet of the back pressure type main turbine is connected with a hot user and a deaerator; the method is characterized in that: the system also comprises a generator and a small steam turbine; the steam outlet of the back pressure type main turbine is also connected with the steam inlet of the small turbine; the small turbine is connected with a generator and/or a feed pump; and the steam exhaust outlet of the small steam turbine is connected with the steam inlet of the water replenishing heater.
2. The cascade utilization system for back pressure exhaust steam energy of the steam turbine of the thermal power plant according to claim 1, characterized in that: the steam turbine also comprises a water supplementing heater heating steam pipeline, and a steam exhaust outlet of the small steam turbine is connected with a steam inlet of the water supplementing heater through the water supplementing heater heating steam pipeline.
3. The cascade utilization system for back pressure exhaust steam energy of the steam turbine of the thermal power plant according to claim 1, characterized in that: still include demineralized water pipeline, the moisturizing export of moisturizing heater is passed through demineralized water pipeline and is connected with the moisturizing import of oxygen-eliminating device.
4. The thermal power plant steam turbine backpressure steam extraction energy cascade utilization system of claim 3, characterized by: still include hot user heat supply steam line, the steam extraction export of back pressure formula main turbine passes through hot user heat supply steam line and is connected with the hot user.
5. The thermal power plant steam turbine backpressure steam extraction energy cascade utilization system of claim 1, characterized by: the steam turbine further comprises a deaerator heating steam pipeline, and a steam exhaust outlet of the back pressure type main steam turbine is connected with the deaerator through the deaerator heating steam pipeline.
6. The thermal power plant steam turbine backpressure steam extraction energy cascade utilization system of claim 5, characterized by: and a deaerating heating steam regulating valve is arranged on the deaerator heating steam pipeline.
7. The thermal power plant steam turbine backpressure steam extraction energy cascade utilization system of claim 1, characterized by: the steam turbine also comprises a small steam turbine steam pipeline, and the steam exhaust outlet of the back pressure type main steam turbine is connected with the steam inlet of the small steam turbine through the small steam turbine steam pipeline.
8. The thermal power plant steam turbine backpressure steam extraction energy cascade utilization system of claim 7, characterized by: and a small turbine inlet regulating valve is installed on the small turbine steam pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117759924A (en) * | 2024-01-23 | 2024-03-26 | 上海金联热电有限公司 | High-pressure deaerator steam heat cooperative cascade utilization equipment and system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117759924A (en) * | 2024-01-23 | 2024-03-26 | 上海金联热电有限公司 | High-pressure deaerator steam heat cooperative cascade utilization equipment and system thereof |
| CN117759924B (en) * | 2024-01-23 | 2024-05-14 | 上海金联热电有限公司 | High-pressure deaerator steam heat cooperative cascade utilization equipment and system thereof |
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