CN218117869U - High-parameter industrial steam supply system for decompression adjustment coupling cascade utilization - Google Patents
High-parameter industrial steam supply system for decompression adjustment coupling cascade utilization Download PDFInfo
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- CN218117869U CN218117869U CN202222373196.1U CN202222373196U CN218117869U CN 218117869 U CN218117869 U CN 218117869U CN 202222373196 U CN202222373196 U CN 202222373196U CN 218117869 U CN218117869 U CN 218117869U
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Abstract
The utility model discloses a the utility model provides a high parameter industry steam supply system that coupling step utilized is adjusted in decompression, include: the thermal power steam supply system comprises a high-pressure heater; the high-parameter steam supply system comprises a main gas supply system and a thermoelectric system; the main gas supply system comprises a pressure reducing valve communicated with an outlet of the high-pressure heater through a pipeline, the pressure reducing valve is communicated with a first-stage heat exchanger through a pipeline, a second-stage heat exchanger is communicated with a pipeline at an outlet of the first heat exchanger, and an outlet of the second-stage heat exchanger is communicated with the high-pressure industrial gas supply system through a pipeline; the thermoelectric system comprises a back pressure turbine, wherein a pipeline is communicated between the back pressure turbine and the second-stage heat exchanger and used for extracting steam to the back pressure turbine from through-flow heat in the second-stage heat exchanger, the back pressure turbine is connected with a power generation assembly, and the power generation assembly is electrically connected with the power supply system. The utility model discloses promote the unit by a wide margin more than 4MPa high parameter industry steam supply ability more than one time, enlarged the combined heat and power generation ability.
Description
Technical Field
The utility model relates to a combined heat and power generation technical field especially relates to a high parameter industry steam supply system that coupling step utilized is adjusted in decompression.
Background
At present, related policies of China and places require accelerating the development of cogeneration and centralized heat supply, the existing cogeneration units, the pure condensing generator sets and the low-grade waste heat around cities and industrial parks are utilized to implement heat supply transformation, coal-fired boilers in the heat supply and gas supply range are eliminated, self-built boilers of enterprises are greatly limited by the policies, and a large number of steam-using enterprises have self-production steam supply to supply steam by large cogeneration units. But at present, a mature scheme, a scheme of conventional main steam supply, a scheme of steam supplement and supply and the like for high-parameter industrial steam supply with the pressure of more than 4MPa does not exist. But the problem of small steam extraction amount exists due to the limitation of reheating and overtemperature of the boiler. For a 60 ten thousand-level unit, the power is generally not more than 100t/h, and for a 30 ten thousand-level unit, only about half of the power is 60 ten thousand-level unit, the actual steam supply capacity can be further reduced if the deep peak regulation is faced, the requirement of a high-parameter industrial steam supply market is difficult to meet, and the high-parameter industrial steam supply can not be completely produced by a steam substitute enterprise. Meanwhile, for power production enterprises, a large amount of electric equipment exists in the production process, and a part of generated energy of the unit is distributed to maintain normal operation of internal electric equipment except that most of generated energy is transmitted to a power grid. The proportion of the internal power consumption of the part is 3-5%, and the proportion of the part air cooling unit is increased. Because the internal power utilization load is high and a large amount of precious electric energy needs to be consumed, the power quantity of the on-line power of the factory with electricity for sale is reduced, the power utilization rate of the factory is increased, and the reduction of the operation income is influenced.
The utility model provides an industry supplies vapour scheme, when realizing that parameter industry supplies vapour more than 4MPa, can also realize that steam ability cascade utilizes, reduces the station service power rate. Compared with the conventional schemes of main steam extraction, steam supply through a steam supplementing valve and the like, the high-temperature feed water or wet steam is sequentially heated to the required high-parameter steam by respectively utilizing the main steam and the hot re-extraction steam through two-stage heat exchange.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
In order to achieve the above object, the utility model provides a high parameter industry steam supply system that coupling step utilized is adjusted in decompression, include:
the thermodynamic steam supply system comprises a high-pressure heater, wherein the outlet of the high-pressure heater is communicated with a boiler, and the inlet of the high-pressure heater is communicated with a deaerator;
the high-parameter steam supply system comprises a main gas supply system and a thermoelectric system;
the main gas supply system comprises a pressure reducing valve communicated with the outlet of the high-temperature heater through a pipeline, the pressure reducing valve is communicated with a first-stage heat exchanger through a pipeline, a second-stage heat exchanger is communicated with the outlet of the first heat exchanger through a pipeline, and the outlet of the second-stage heat exchanger is communicated with the high-pressure industrial gas supply system through a pipeline;
the thermoelectric system comprises a back pressure turbine, the back pressure turbine is communicated with a pipeline between the second-stage heat exchangers and used for extracting steam to the back pressure turbine from through-flow heat in the second-stage heat exchangers, the back pressure turbine is connected with a power generation assembly, and the power generation assembly is electrically connected with the power station system.
The utility model discloses an exit at the high pressure feed water of heating power steam supply system's high pressure feed water or wet steam is drawn forth, supply with to the first order heat exchanger after decompressing through the relief pressure valve, and through first order heat exchanger and second level heat exchanger, carry out multistage heat transfer treatment to high temperature feed water or wet steam, thereby make original heating power steam supply system to the high parameter industry more than 4MPa steam supply system the ability that supplies the vapour operation improve more than one time, and extract the vapour to heat and carry out the utilization of generating electricity, the multistage utilization of steam has been realized, and cogeneration's ability has been enlarged, and avoided the throttling loss that the direct temperature reduction of industry steam supply decompression brought, energy efficiency has been improved.
Optionally, the heating power steam supply system further includes a boiler, a low pressure cylinder, an intermediate pressure cylinder and a high pressure cylinder, the boiler is provided with a main steam pipeline in communication with the high pressure cylinder, the boiler is provided with a hot re-steam extraction pipeline in communication with the intermediate pressure cylinder, the first-stage heat exchanger is provided in communication with the main steam pipeline, and the second-stage heat exchanger is provided in communication with the hot re-steam extraction pipeline.
Furthermore, a first valve group and a second valve group for controlling the on-off and flow of the corresponding pipelines are respectively arranged on the main steam pipeline and the hot re-extraction pipeline.
Furthermore, a steam recovery pipeline is arranged between the intermediate pressure cylinder and the low pressure cylinder, the back pressure steam turbine is communicated with the steam recovery pipeline to be provided with a branch recovery pipeline, and the steam recovery pipeline is located at the inlet of the low pressure cylinder and is provided with a third valve group.
Furthermore, a first control valve is arranged at the position of an inlet pipeline of the pressure reducing valve, a second control valve is arranged at the position of an outlet pipeline of the second-stage heat exchanger, a third control valve is arranged on a connecting pipeline of the second-stage heat exchanger and the back pressure turbine, and a fourth control valve is arranged on the branch recovery pipeline.
Furthermore, the first-stage heat exchanger is provided with a condensed water loop, the condensed water loop is communicated with the deaerator inlet, so that main steam condensed water in the first-stage heat exchanger flows back to the deaerator, and a fifth control valve is arranged on the condensed water loop.
Furthermore, a communication pipeline between the second-stage heat exchanger and the backpressure steam turbine is a cooling pipeline, so that heat in the second-stage heat exchanger is pumped again to be cooled and then enters the backpressure steam turbine, and a fourth valve set is arranged at one end, close to the low-pressure cylinder, of the cooling pipeline.
Further, the power generation component comprises a gear box in transmission connection with the backpressure steam turbine, an output shaft of the gear box is connected with an asynchronous generator set for driving the asynchronous generator set to perform power generation operation, and the one-step generator set is electrically connected with the service power system.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization according to the present invention.
Description of the reference numerals:
1. a boiler; 2. a high pressure cylinder; 3. an intermediate pressure cylinder; 4. a low pressure cylinder; 5. a high pressure heater; 6. a deaerator; 7. a feed pump; 8. a low pressure heater; 9. a condensate pump; 10. a condenser; 11. a third valve group; 12. a first control valve; 13. a first valve group; 14. a fifth control valve; 15. a second valve group; 16. a fourth control valve; 17. a pressure reducing valve; 18. a first stage heat exchanger; 19. a second stage heat exchanger; 20. a back pressure turbine; 21. a gear box and a coupling; 22. an asynchronous generator set; 23. a third control valve; 24. a second control valve; 25. a fourth valve group; 26. and a service power system.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.
The utility model discloses a high parameter industry that coupling step was utilized is adjusted in decompression supplies vapour system, and the following elaboration is made with reference to figure 1
A high-parameter industrial steam supply system for decompression adjustment coupling cascade utilization comprises a thermal steam supply system and a thermal steam supply multistage utilization system:
the thermal power steam supply system comprises a high-pressure heater 5, wherein the outlet of the high-pressure heater 5 is communicated with a boiler 1, the thermal power steam supply system also comprises a deaerator 6 communicated with the inlet of the high-pressure heater 5, the outlet of the deaerator 6 is communicated with a water feed pump 7, namely the water feed pump 7 is arranged on a communication pipeline between the deaerator 6 and the high-pressure heater 5, and the inlet of the deaerator 6 is communicated with a low-pressure heater 8;
the high-parameter steam supply system comprises a main gas supply system and a thermoelectric system;
the main gas supply system comprises a pressure reducing valve 17 communicated with an outlet of the high-temperature heater 5 through a pipeline, the pressure reducing valve 17 is communicated with a first-stage heat exchanger 18 through a pipeline, a second-stage heat exchanger 19 is communicated with an outlet of the first heat exchanger through a pipeline, and an outlet of the second-stage heat exchanger 19 is communicated with the high-pressure industrial gas supply system through a pipeline;
the thermoelectric system comprises a back pressure turbine 20, wherein the back pressure turbine 20 is communicated with the second-stage heat exchanger 19 through a pipeline and used for extracting steam to the back pressure turbine 20 from through-flow heat in the second-stage heat exchanger 19, the back pressure turbine 20 is connected with a power generation assembly, and the power generation assembly is electrically connected with the power generation assembly and an auxiliary power system 26.
The utility model discloses an exit at the high pressure feed water of heating power steam supply system 5 draws forth high temperature feedwater or wet steam, supply with to first order heat exchanger 18 after decompression through relief pressure valve 17, and through first order heat exchanger 18 and second level heat exchanger 19, carry out multistage heat transfer processing to high temperature feedwater or wet steam, thereby make original heating power steam supply system to the high parameter industry more than 4MPa supply the ability that steam supply system supplied the vapour operation more than one time improve, and to the steam extraction utilization that generates electricity again of heat, the multistage utilization of steam has been realized, and cogeneration's ability has been enlarged, and avoided the throttling loss that the direct temperature reduction of industry steam supply decompression brought, energy efficiency has been increased.
Wherein, heating power supplies vapour system still includes low pressure jar 4, intermediate pressure jar 3 and high-pressure jar 2, and boiler 1 is provided with the main steam pipeline with high-pressure jar 2 intercommunication, and boiler 1 is provided with the hot extraction pipeline again with intermediate pressure jar 3 intercommunication, and first order heat exchanger 18 sets up with the main steam pipeline intercommunication, and second level heat exchanger 19 sets up with hot extraction pipeline intercommunication again. The main steam pipeline and the hot re-extraction pipeline are respectively provided with a first valve group 13 and a second valve group 15 which are used for controlling the on-off and the flow of the corresponding pipelines.
In the thermal power steam supply system, the intermediate pressure cylinder 3 is communicated with the boiler 1 through a pipeline, the outlet of the low pressure cylinder 4 is communicated with a condenser through a pipeline, low pressure steam in the low pressure cylinder 4 is condensed into condensate water through the condenser, the outlet of the condenser is communicated with a low pressure heater 8 through a pipeline, a condensate water pump 9 is arranged on the pipeline between the condenser and the low pressure heater 8, the condensate water condensed by the condenser is supplied to the low pressure heater 8 through the condensate water pump 9 for heating treatment, the outlet of the low pressure heater 8 is communicated with a deaerator 6 through a pipeline, the condensate water flows to the deaerator 6 for processing treatment after being heated by the low pressure heater 8, the outlet of the deaerator 6 is communicated with the high pressure heater 5, the outlet of the high pressure heater 5 is communicated with the boiler 1 through a pipeline and is used for heating the saturated condensate water treated by the deaerator 6 to generate high temperature feed water or wet steam to be supplied to the boiler 1, one part of the high temperature feed water or the wet steam treated by the high pressure heater 5 is supplied to the boiler 1, and the other part of the high temperature feed water or the wet steam is drained to the pressure reducing valve 17.
Wherein, a steam recovery pipeline is arranged between the intermediate pressure cylinder 3 and the low pressure cylinder 4; considering further that, after the high-parameter steam supply system generates heat and then extracts steam into the pressurized steam turbine to do work, the steam needs to be recovered, so that a branch recovery pipeline is provided in the communication between the back pressure steam turbine 20 and the steam recovery pipeline, a third valve set 11 is provided at the inlet of the low pressure cylinder 4 in the steam recovery pipeline, and in this embodiment, the valve set is provided as a butterfly valve. For introducing the steam in the back pressure turbine 20 into the low pressure cylinder 4 for synchronous recycling. In the thermoelectric system, a communication pipeline between the second-stage heat exchanger 19 and the back pressure turbine 20 is a cooling pipeline, and the temperature of the steam is naturally reduced in the pipeline transportation process, so that the heat in the second-stage heat exchanger 19 is extracted again to reduce the temperature and then enters the back pressure turbine 20, and a fourth valve set 25 is arranged at one end of the cooling pipeline close to the low pressure cylinder 4.
Further, in the thermoelectric system, the power generation assembly includes a gear box in transmission connection with the backpressure turbine 20, an output shaft of the gear box is connected with an asynchronous generator set 22 for driving the asynchronous generator set 22 to perform power generation operation, and the one-step generator set is electrically connected with the service power system 26.
In order to perform targeted control on the steam, the high-temperature feed water flow and the on-off of the pipelines of each pipeline, a first control valve 12 is arranged at an inlet pipeline of the pressure reducing valve 17, a second control valve 24 is arranged at an outlet pipeline of the second-stage heat exchanger 19, a third control valve 23 is arranged on a connecting pipeline of the second-stage heat exchanger 19 and the back pressure turbine 20, and a fourth control valve 16 is arranged on a branch recovery pipeline.
Further, consider that, after the steam in the main steam pipeline and the comdenstion water that gets into in the first order heat exchanger 18 carried out the heat exchange, the main steam temperature reduces and can produce the comdenstion water, the comdenstion water that main steam produced in the first order heat exchanger 18 needs to be retrieved and recycles, consequently, be provided with the condensate water return circuit at first order heat exchanger 18, the condensate water return circuit sets up with the entry intercommunication of oxygen-eliminating device 6, so that the main steam comdenstion water among the first order heat exchanger 18 flows back to oxygen-eliminating device 6, be provided with fifth control valve 14 on the condensate water return circuit.
The utility model discloses a theory of operation does:
the main steam at the outlet of the boiler 1 is divided into two paths, one path enters the first-stage heat exchanger 18 through a main steam pipeline, the other path enters the high-pressure cylinder 2 through the main steam pipeline to do work, and the exhaust steam of the high-pressure cylinder 2 enters the boiler 1 through a pipeline again to be secondarily heated to be used as reheat steam;
the reheating steam at the outlet of the boiler 1 is divided into two paths, one path enters the hot side fluid inlet of the second-stage heat exchanger 19 through a reheating pumping pipeline, and the second path enters the intermediate pressure cylinder 3 along the pipeline to do work;
the exhaust steam of the intermediate pressure cylinder 3 enters the low pressure cylinder 4 through a recovery pipeline to do work, the steam sequentially passes through a condenser 10 to form condensed water after doing work in the low pressure cylinder 4, and reaches a deaerator 6 through a low pressure heater 8 under the action of a condensed water pump 9 to form saturated condensed water through the operation of the deaerator 6;
after being heated by the high-pressure heater 5 in the deaerator 6, the saturated condensate water is divided into two paths at the outlet of the high-pressure heater 5, one path of the saturated condensate water enters the boiler 1 to be processed to generate main steam, and the other path of the saturated condensate water is pressurized by the pressure reducing valve 17 to supply high-temperature feed water or wet steam to the first-stage heat exchanger 18;
the main steam in the first stage heat exchanger 18 exchanges heat with high-temperature feed water or wet steam to generate high-pressure saturated hot steam and main steam condensate, the main steam condensate flows out of a fluid outlet at the hot side of the first stage heat exchanger 18 and enters the deaerator 6 again through a condensate water loop, the high-pressure saturated hot steam enters the second stage heat exchanger 19 through a fluid outlet at the cold side of the first stage heat exchanger 18, in the second stage heat exchanger, the high-pressure saturated hot steam exchanges heat with heat re-extracted steam entering the second stage heat exchanger 19, after heat exchange of the high-pressure saturated hot steam is completed in the second stage heat exchanger 19, superheated steam is generated at a fluid outlet at the cold side of the second stage heat exchanger 19 and is supplied to a high-parameter industrial steam supply system, the steam at the fluid outlet at the hot side of the second stage heat exchanger 19 enters the back pressure steam turbine 20 through a cooling pipeline, the back pressure steam turbine 20 is driven to do work so as to drive a power generation assembly to perform power generation operation, and the electric power generated by the power generation operation is supplied to the power utilization system 26;
after the work of the steam in the backpressure steam turbine 20 is finished, the steam enters the low-pressure cylinder 4 along the branch recovery pipeline to do work, the steam enters the condenser 10 again after the work of the steam in the low-pressure cylinder 4 is finished to form condensate water, and the condensate water passes through the low-pressure heater 8 and reaches the deaerator 6 under the action of the condensate pump 9 to form thermodynamic cycle.
The utility model also provides a high parameter industry steam supply system's application method based on above-mentioned decompression is adjusted coupling step and is utilized.
A use method of a high-parameter industrial steam supply system for decompression adjustment coupling cascade utilization comprises the following steps:
s1, controlling a pressure reducing valve 17 to work, extracting high-temperature feed water or wet steam from a high-pressure heater 5, performing pressure reduction treatment on the high-temperature feed water or the wet steam, and supplying the high-temperature feed water or the wet steam to a first-stage heat exchanger 18;
s2, extracting steam from the main steam along a main steam pipeline, allowing the main steam to enter a first-stage heat exchanger 18 to exchange heat with high-temperature water supply or wet steam, and generating high-pressure steam in the first-stage heat exchanger 18 to supply the high-pressure steam to a second-stage heat exchanger 19;
s3, hot re-extraction steam enters the second-stage heat exchanger 19 through a hot re-extraction pipeline and exchanges heat with high-pressure saturated hot steam in the second-stage heat exchanger 19 to heat the high-pressure saturated hot steam again;
and S4, the high-pressure saturated hot steam heated in the S3 generates superheated steam and enters a high-pressure industrial gas supply system, the hot re-extracted steam in the second-stage heat exchanger 19 enters the backpressure steam turbine 20 through a cooling pipeline to drive the backpressure steam turbine to do work, and the power generation assembly is driven to perform power generation operation so as to supplement and supply power to the service power system 26.
In S2, the main steam and the saturated condensate water form condensate water after heat exchange in the first-stage heat exchanger 18, the condensate water flows back to an inlet of the deaerator 6 through a condensate water loop, the condensate water is processed into saturated condensate water through the deaerator 6 and then is supplied to the high-pressure heater 5, high-temperature feed water or wet steam is generated after the condensate water is heated by the high-pressure heater 5, one path of the high-temperature feed water or the wet steam is supplied to the boiler 1, the other path of the high-temperature feed water or the wet steam is supplied to the pressure valve 17, and the high-temperature feed water or the wet steam is supplied to the first-stage heat exchanger 18 again under the action of the pressure reducing valve 17 to perform the S1 step.
In S4, the hot re-extraction steam from the second stage heat exchanger 19 entering the back pressure turbine 20 drives the back pressure turbine 20 to work and then flows back to the low pressure cylinder 4 along the branch recovery pipeline.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization is characterized by comprising:
the thermodynamic steam supply system comprises a high-pressure heater, wherein the outlet of the high-pressure heater is communicated with a boiler, and the inlet of the high-pressure heater is communicated with a deaerator;
the high-parameter steam supply system comprises a main gas supply system and a thermoelectric system;
the main gas supply system comprises a pressure reducing valve communicated with the outlet of the high-pressure heater through a pipeline, the pressure reducing valve is communicated with a first-stage heat exchanger through a pipeline, the outlet of the first-stage heat exchanger is communicated with a second-stage heat exchanger through a pipeline, and the outlet of the second-stage heat exchanger is communicated with the high-pressure industrial gas supply system through a pipeline;
the thermoelectric system comprises a back pressure turbine, the back pressure turbine is communicated with a pipeline between the second-stage heat exchangers to extract steam to the back pressure turbine again from through-flow heat in the second-stage heat exchangers, the back pressure turbine is connected with a power generation assembly, and the power generation assembly is electrically connected with the station service power system.
2. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization according to claim 1, wherein the thermodynamic steam supply system further comprises a low pressure cylinder, an intermediate pressure cylinder and a high pressure cylinder, a main steam pipeline is arranged in the boiler and communicated with the high pressure cylinder, a hot re-extraction pipeline is arranged in the boiler and communicated with the intermediate pressure cylinder, the first-stage heat exchanger is arranged in the main steam pipeline in a communicated manner, and the second-stage heat exchanger is arranged in the hot re-extraction pipeline in a communicated manner.
3. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization as claimed in claim 2, wherein the main steam pipeline and the hot re-extraction pipeline are respectively provided with a first valve group and a second valve group for controlling the on-off and flow rate of the corresponding pipelines.
4. The high-parameter industrial steam supply system with pressure reduction and regulation coupled step utilization of claim 2, wherein a steam recovery pipeline is arranged between the intermediate pressure cylinder and the low pressure cylinder, the back pressure turbine is provided with a branch recovery pipeline communicated with the steam recovery pipeline, and the steam recovery pipeline is provided with a third valve set at the inlet of the low pressure cylinder.
5. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization of claim 4, wherein a first control valve is arranged at an inlet pipeline of the pressure reducing valve, a second control valve is arranged at an outlet pipeline of the second-stage heat exchanger, a third control valve is arranged on a connecting pipeline of the second-stage heat exchanger and the back pressure turbine, and a fourth control valve is arranged on the branch recovery pipeline.
6. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization according to claim 1, wherein the first-stage heat exchanger is provided with a condensed water loop, the condensed water loop is communicated with an inlet of the deaerator to enable main steam condensed water in the first-stage heat exchanger to flow back to the deaerator, and a fifth control valve is arranged on the condensed water loop.
7. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization according to claim 2, wherein a communication pipeline between the second-stage heat exchanger and the back pressure turbine is a cooling pipeline, so that heat in the second-stage heat exchanger is extracted again to be cooled and then enters the back pressure turbine, and a fourth valve set is arranged at one end, close to the low pressure cylinder, of the cooling pipeline.
8. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization according to claim 1, wherein the power generation assembly comprises a gear box in transmission connection with the back pressure turbine, an asynchronous generator set is connected to an output shaft of the gear box for driving the asynchronous generator set to perform power generation operation, and the asynchronous generator set is electrically connected with the service power system.
9. The high-parameter industrial steam supply system for pressure reduction regulation coupling cascade utilization of claim 1, wherein a feed water pump is arranged between the deaerator and the high-pressure heater.
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