Quick load-changing thermal system with steam extraction header and regulation method

Abstract

The present application relates to thermal power generation technology field, specifically disclose a kind of quick load change thermal system and regulation and control method with extraction header, including steam turbine, with steam turbine and main steam reheating cold section pipeline cooperation using high-pressure heating component, for connecting steam turbine and high-pressure heating component extraction pipe one, for connecting main steam reheating cold section pipeline and high-pressure heating component extraction pipe two, and with extraction pipe one connection and form loop extraction header;Extraction pipe one is connected between the inlet of extraction header by steam storage pipe line, and the outlet of extraction header is connected between extraction pipe one by steam supplement pipe line.The present application effectively realizes in the daily operation of generator set and does not need full load output condition, high-temperature high-pressure steam is stored to extraction header;When generator set needs to increase load, high-temperature high-pressure steam is transported to corresponding high-pressure heater quickly and efficiently, additional power output of generator set is realized;Greatly improve the response time of load increase.

Description

Technical Field

[0001] This invention relates to the field of thermal power generation technology, and more specifically, to a rapid load-changing thermal system with extraction steam header and a control method thereof. Background Technology

[0002] In recent years, the installed capacity of new energy in China has continued to grow rapidly, and the power grid has placed stringent requirements on the deep peak shaving and rapid load change capabilities of coal-fired power units. The "Implementation Plan for the Special Action to Upgrade New Generation Coal-fired Power (2025-2027)" clearly stipulates that the rate of change of newly built coal-fired power units in the 30%-50% load range must be ≥2%Pe / min, and the rate of change of change of units in the range above 50% load must be ≥4%Pe / min, in order to adapt to the grid's requirements for new energy consumption and frequency response.

[0003] The load adjustment mechanism of conventional thermal power plants is a full-process interlocking response mechanism: after receiving a load change command, the unit must sequentially adjust the pulverizing system, change the combustion conditions in the boiler furnace, and adjust the flow and parameters of the main steam pipeline before finally transmitting the response to the turbine and generator to complete the output response. The actual load level and load change rate of a coal-fired power unit depend primarily on the combustion conditions in the boiler furnace, and the output of the coal mill, as a core external device that directly determines the pulverized coal supply to the boiler, is strongly correlated with the boiler load.

[0004] Current mainstream coal-fired power unit thermal systems have revealed several shortcomings in actual rapid load change operation, making them difficult to adapt to the requirements of the next generation of coal-fired power upgrades: Firstly, when the unit adjusts from low load to high load and requires the addition of new coal mills, the coal mill takes a long time to complete the entire process of warming up, purging, and grinding from receiving the start command. This directly results in an excessively long overall start-up and switching cycle for the coal mills and a serious lag in load change response. Secondly, when the coal mill is put into operation or shut down during the load change process, the coal powder supply of the boiler is prone to fluctuate significantly before and after the operation, which directly causes the boiler load curve to be uneven and unstable, and may even lead to operational risks such as the main steam parameters exceeding the limit. Third, the existing pulverizing system has an excessively long load change response chain. The complete process requires multiple steps, including adjusting the coal feed rate in the coal hopper, regulating the output of the coal feeder, conveying the coal into the mill via the coal feeder belt, and finally feeding the pulverized coal into the furnace after the mill completes the grinding and drying of the pulverized coal. The lag time from receiving the load change command to the corresponding change in the actual amount of pulverized coal in the furnace is extremely long, which directly limits the boiler's load change response capability. Ultimately, this results in the turbine side's actual output change rate failing to meet the requirements of the new generation of coal-fired power plant upgrade project.

[0005] Therefore, the existing structure and operating logic of conventional coal-fired power unit thermal systems can no longer effectively support the rapid load change requirements proposed by the new generation of coal-fired power upgrades. The industry urgently needs targeted technical solutions to address the above-mentioned core pain points. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a rapid load change thermal system with extraction steam header and a control method thereon; The solution adopted by this invention to solve the technical problem is: on the one hand: A rapid load change thermal system with extraction steam header includes a steam turbine, a high-pressure heating assembly used in conjunction with the steam turbine and the main steam reheat cold section pipeline, an extraction steam pipe one for connecting the steam turbine and the high-pressure heating assembly, an extraction steam pipe two for connecting the main steam reheat cold section pipeline and the high-pressure heating assembly, and an extraction steam header connected to the extraction steam pipe one and forming a loop. The extraction steam pipe is connected to the inlet of the extraction steam header via a steam storage pipeline, and the outlet of the extraction steam header is connected to the extraction steam pipe via a make-up steam pipeline.

[0007] In some possible implementations, the steam storage pipeline includes a steam storage branch corresponding to and connected to the extraction steam pipe, a main steam pipe for connecting the steam storage branch to the inlet of the extraction steam header, and a steam storage shut-off valve installed on the steam storage branch.

[0008] In some possible implementations, the make-up steam pipeline includes a make-up steam branch corresponding to and connected to extraction steam pipe one and extraction steam pipe two, and a steam main pipe two for connecting the make-up steam branch to the outlet of the extraction steam header.

[0009] In some possible implementations, a main shut-off valve is provided on the second main steam pipe; a steam replenishment regulating valve group is provided on the steam replenishment branch; the steam replenishment regulating valve group includes a steam replenishment shut-off valve and a steam replenishment regulating valve arranged sequentially along the steam flow direction.

[0010] In some possible implementations, temperature monitoring components and pressure monitoring components are respectively installed on the steam storage branch, steam main pipe one, steam main pipe two, and make-up steam branch; the temperature monitoring components and pressure monitoring components are located on the side of the main shut-off valve away from the extraction steam header.

[0011] In some possible implementations, the high-pressure heating assembly includes a high-pressure heater one connected to the high-pressure cylinder of the steam turbine via an extraction pipe one, and a high-pressure heater two connected to the intermediate and low-pressure cylinders of the steam turbine or the main steam reheat cold section pipeline via an extraction pipe two and connected to the high-pressure heater one; the high-pressure heater one and the extraction pipe one are correspondingly arranged; the high-pressure heater one and the high-pressure heater two are connected in sequence according to their pressure levels.

[0012] In some possible implementations, the high-pressure heater is divided into two groups, including a No. 0 high-pressure heater and a No. 1 high-pressure heater, which are respectively connected to the high-pressure cylinder of the steam turbine through an extraction pipe; the No. 0 high-pressure heater and the No. 1 high-pressure heater are connected in sequence according to their pressure levels.

[0013] In some possible implementations, the second high-pressure heater is in multiple groups, including a No. 2 high-pressure heater connected to the main steam pipeline via the second extraction steam pipe, and a No. 3 high-pressure heater connected to the low-pressure cylinder of the steam turbine via the second extraction steam pipe; the No. 2 high-pressure heater and the No. 3 high-pressure heater are respectively connected to the second main steam pipe via a supplementary steam branch.

[0014] on the other hand: A control method for a rapid load change thermal system with an extraction steam header, based on the rapid load change thermal system with an extraction steam header as described in the above claims; When the generator set is running at non-full load, it is charged with steam. The high-temperature and high-pressure steam in the extraction pipe is transported to the extraction header for storage through the corresponding hydrogen storage branch. When the generator set increases its load, the high-temperature and high-pressure steam in the extraction steam header is transported into the high-pressure heating components through the make-up steam branch.

[0015] In some possible implementations, when the generator set needs to increase its load, the high-temperature and high-pressure steam from the extraction header is sequentially delivered to the high-pressure heating components according to the pressure level through the supplementary steam branch; When the generator set needs to rapidly increase load, all the make-up steam branches are opened at the same time, and the high-temperature and high-pressure steam in the extraction steam header is transported to the corresponding extraction steam pipe one and extraction steam pipe two through the make-up steam branches. The high-temperature and high-pressure steam enters the high-pressure heating assembly through extraction steam pipe one and extraction steam pipe two.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, by setting up an extraction steam header connected to multiple sets of extraction steam pipes, effectively enables the storage of high-temperature and high-pressure steam in the extraction steam header during normal operation of the generator set when it does not need to operate at full load; when the generator set needs to increase load, it enables the rapid and efficient delivery of high-temperature and high-pressure steam to the corresponding high-pressure heater, thereby increasing the generator set output; and greatly improves the load increase response time. This invention only requires a steam extraction header, related piping and valve components. Compared with the existing furnace-side small pulverized silo system, this invention is easier to arrange and has a lower cost. In this invention, the steam storage and replenishment of the extraction steam header can be operated at high frequency, greatly improving its service life; it is particularly suitable for daily and nighttime peak shaving of 150MW~1000MW class generator sets, greatly improving the flexibility of the unit for frequent peak shaving in a short period of time. This invention can be used alone to meet the requirements of rapid load change of the unit, or it can be used in conjunction with the relevant load change system on the furnace side to make up for the shortcoming of the furnace side system in responding slowly to rapid load increase. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection relationship in this invention; in: 10. Steam turbine; 20. High-pressure heating assembly; 201, No. 0 high-pressure heater; 202, No. 1 high-pressure heater; 203, No. 2 high-pressure heater; 30. Extraction pipe one; 1. Steam extraction header; 2. Steam storage pipeline; 21. Steam storage branch; 22. Steam main pipe 1; 23. Steam storage shut-off valve; 3. Steam replenishment pipeline; 31. Steam replenishment branch; 311. Steam replenishment regulating valve assembly; 32. Steam main pipe two; 321. Main shut-off valve. Detailed Implementation

[0018] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] The present invention will now be described in detail.

[0020] on the one hand: like Figure 1As shown, a rapid load change thermal system with an extraction steam header includes a steam turbine 10, a high-pressure heating assembly 20 connected to the steam turbine 10 and the main steam reheat cold section pipeline, an extraction steam pipe 30 for connecting the steam turbine 10 and the high-pressure heating assembly 20, an extraction steam pipe 40 for connecting the main steam reheat cold section pipeline and the high-pressure heating assembly 20, and an extraction steam header 1 connected to the extraction steam pipe 30 and forming a loop; the inlet of the extraction steam pipe 30 and the extraction steam header 1 are connected by a steam storage pipeline 2, and the outlet of the extraction steam header 1 and the extraction steam pipe 30 are connected by a make-up steam pipeline 3.

[0021] Specifically, the volume of the extraction header 1 can be calculated based on the capacity selection design according to the load change time requirements of the generator set; In this invention, the inlet of the steam extraction manifold 1 is connected to the steam extraction pipe 30 via the steam storage pipe 2, and its outlet is connected to the steam extraction pipe 30 via the steam replenishment pipe 3. During normal operation of the generator set, and when full load output is not required, the high-temperature and high-pressure steam in the extraction pipe 30 will be transported to the extraction header 1 for storage through the steam storage pipeline 2. When the generator set needs to increase load, the high-temperature and high-pressure steam stored in the extraction steam header 1 is transported to the high-pressure heating component 20 through the steam replenishment pipeline 3, so as to provide heating steam for the high-pressure heating component 20, reduce the amount of reheated steam extracted by the turbine 10, and allow this part of the steam to continue to expand and do work in the turbine 10, thereby additionally increasing the generator output of the unit.

[0022] In some possible implementations, the steam storage pipeline 2 includes a steam storage branch 21 corresponding to and connected to the extraction steam pipe 30, a steam main pipe 22 for connecting the steam storage branch 21 to the inlet of the extraction steam header 1, and a steam storage shut-off valve 23 installed on the steam storage branch 21. By installing a steam storage shut-off valve 23 on each group of steam storage branches 21, the flow rate and steam source of high-temperature and high-pressure steam in the corresponding steam storage branch 21 can be controlled by controlling the steam storage shut-off valve 23 during steam storage. The steam replenishment pipeline 3 includes a steam replenishment branch 31 that is correspondingly provided and connected to the extraction steam pipe 30 and the extraction steam pipe 40, and a steam main pipe 32 for connecting the steam replenishment branch 31 to the outlet of the extraction steam header 1. One end of the supplementary steam branch 31 is connected to the high-pressure heater in the high-pressure heating assembly 20 via extraction steam pipe 1 30 or extraction steam pipe 2 40, and the other end is connected to the steam main pipe 2 32, thereby realizing the transportation of high-temperature and high-pressure steam in the extraction steam header 1 to each high-pressure heater in the high-pressure heating assembly 20.

[0023] Specifically, the steam storage branch 21 is set up in correspondence with the extraction steam pipe 30, the steam main pipe 22 is a group, and multiple groups of steam storage branch 21 are connected to the steam main pipe 22. The high temperature and high pressure steam in the extraction steam pipe 30 is transported to the extraction steam header 1 for storage through the steam main pipe 22. The supplementary steam branch 31 is set up one-to-one with the extraction steam pipe (extraction steam pipe 1 30 and extraction steam pipe 2 40), and the main steam pipe 2 32 is a group; multiple groups of supplementary steam branch 31 are connected to the main steam pipe 2 32 to realize the transportation of high temperature and high pressure steam in the extraction steam header 1 to the corresponding extraction steam pipe (extraction steam pipe 1 30 and extraction steam pipe 2 40), and finally to the corresponding high pressure heater.

[0024] In some possible implementations, a main shut-off valve 321 is provided on the second steam main pipe 32; a steam replenishment regulating valve group 311 is provided on the steam replenishment branch 31; the steam replenishment regulating valve group 311 includes a steam replenishment shut-off valve and a steam replenishment regulating valve arranged sequentially along the steam flow direction; during steam storage, the main shut-off valve 321, the steam replenishment shut-off valve and the steam replenishment regulating valve are closed; during steam replenishment, the main shut-off valve 321 and the steam replenishment shut-off valve are opened, and the steam pressure in each steam replenishment branch 31 is regulated by the steam replenishment regulating valve on the steam replenishment branch 31.

[0025] In some possible implementations, temperature monitoring components and pressure monitoring components are respectively installed on the steam storage branch 21, steam main pipe 1 22, steam main pipe 2 32, and steam replenishment branch 31; the temperature monitoring components and pressure monitoring components are located on the side of the main shut-off valve 321 away from the extraction steam header 1; through this arrangement, the temperature and pressure of the steam in each pipeline can be monitored.

[0026] In some possible implementations, the high-pressure heating assembly 20 includes a high-pressure heater one connected to the high-pressure cylinder of the turbine 10 via an extraction pipe 30, and a high-pressure heater two connected to the intermediate and low-pressure cylinders of the turbine or the main steam reheat cold section pipeline via an extraction pipe 40 and connected to the high-pressure heater one; the high-pressure heater one and the extraction pipe 30 are correspondingly arranged; the high-pressure heater one and the high-pressure heater two are connected sequentially according to their pressure levels; the high-pressure heater one consists of two sets, including a No. 0 high-pressure heater 201 and a No. 1 high-pressure heater 202 respectively connected to the high-pressure cylinder of the turbine 10 via the extraction pipe 30; the No. 0 high-pressure heater 201 and the No. 1 high-pressure heater 202 are connected sequentially according to their pressure levels. Specifically, when there are two sets of high-pressure heaters, high-pressure heater one includes high-pressure heater 0 201 and high-pressure heater 1 202 connected to high-pressure heater 0 201. The pressure rating of high-pressure heater 0 201 is greater than that of high-pressure heater 1 202. High-pressure heater 0 201 and high-pressure heater 1 202 are set up corresponding to the high-pressure cylinder of turbine 10. At this time, there are two sets of extraction steam pipes 30. One set of extraction steam pipes 30 is used to connect high-pressure heater 0 and high-pressure cylinder of turbine 10, and the other set of extraction steam pipes 30 is used to connect heater 1 and high-pressure cylinder of turbine 10. Among them, one set of steam storage branch 21 and one set of steam replenishment branch 31 are connected to the extraction steam pipe 30 corresponding to high-pressure heater 0 201, and the other set of steam storage branch 21 and one set of steam replenishment branch 31 are connected to the extraction steam pipe 30 corresponding to high-pressure heater 1 202. During normal operation of the unit, when the unit does not need to output at full load, the high-pressure and high-temperature steam in the extraction pipe 30 corresponding to the No. 0 high-pressure heater 201 is first extracted to the extraction header 1 for storage until the temperature and pressure reach the set value; then the high-pressure and high-temperature steam in the extraction pipe 30 corresponding to the No. 1 high-pressure heater 202 is extracted to the extraction header 1 for storage. Of course, the high-pressure heater can also be a group, in which case there is only high-pressure heater 202; then the extraction pipe 30 corresponding to high-pressure heater 202 is used directly to extract steam and transport it to the extraction header 1 for storage.

[0027] The second high-pressure heater consists of multiple sets, including a No. 2 high-pressure heater 203 connected to the main steam pipeline via an extraction steam pipe 2 40, and a No. 3 high-pressure heater connected to the low-pressure cylinder of the steam turbine 10 via an extraction steam pipe 2 40; the No. 2 high-pressure heater 203 and the No. 3 high-pressure heater are respectively connected to the main steam pipe 2 32 via a supplementary steam branch 31. High-pressure heaters 0 (201), 1 (202), 2 (203), and 3 (3) will be connected in sequence.

[0028] When the generator set needs to increase load, the high-temperature and high-pressure steam stored in the extraction steam header 1 is first transported to the extraction steam pipe 30 corresponding to the high-pressure heater 201 through the supplementary steam branch 31. As the pressure in the extraction steam header 1 gradually decreases and does not meet the parameter requirements of the extraction steam pipe 30, the extraction steam pipe 30 no longer supplements steam, thus completing the supply of heating steam to the high-pressure heater 201. Then, the high-temperature and high-pressure steam stored in the extraction steam header 1 is transported to the extraction steam pipe 30 corresponding to the No. 1 high-pressure heater 202 through the steam replenishment branch 31 corresponding to the No. 1 high-pressure heater 202, thereby providing heating steam for the No. 1 high-pressure heater 202. Then, steam was added to high-pressure heater 203 and high-pressure heater 3 in sequence.

[0029] Furthermore, when the generator set needs to rapidly increase the load, each supplementary steam branch 31 is opened simultaneously. By adjusting the corresponding supplementary steam shut-off valve and supplementary steam regulating valve, the temperature and pressure of the high-temperature and high-pressure steam in each supplementary steam branch 31 are regulated, and the steam is sent to the corresponding extraction steam pipe (extraction steam pipe one 30, extraction steam pipe two 10) for supplementary steam, thereby entering the corresponding high-pressure heater to achieve rapid load change.

[0030] By transporting the high-temperature and high-pressure steam in the extraction header 1 to the high-pressure heating component 20, the amount of reheated steam extracted by the turbine 10 will be reduced, allowing this portion of steam to continue to expand and do work within the turbine 10, thereby further increasing the unit's power generation output.

[0031] On the other hand: a control method for a rapid load change thermal system with extraction steam header, based on the rapid load change thermal system with extraction steam header described above. When the generator set is running at non-full load, it is charged with steam. The high-temperature and high-pressure steam in the extraction pipe 30 is transported to the extraction header 1 for storage through the corresponding hydrogen storage branch. When the generator set increases its load, the high-temperature and high-pressure steam in the extraction steam header 1 is transported into the high-pressure heating assembly 20 through the make-up steam branch 31.

[0032] In some possible implementations, when the generator set needs to increase its load, the high-temperature and high-pressure steam from the extraction header 1 is sequentially delivered to the high-pressure heating assembly 20 according to the pressure level through the supplementary steam branch 31. When the generator set needs to quickly increase the load, all the make-up steam branches 31 are opened at the same time, and the high-temperature and high-pressure steam in the extraction steam header 1 is transported to the corresponding extraction steam pipe 1 30 and extraction steam pipe 2 40 through the make-up steam branch 31. The high-temperature and high-pressure steam enters the high-pressure heating component 20 through the extraction steam pipe 1 30 and extraction steam pipe 2 40.

[0033] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A rapid load change thermal system with an extraction steam header, characterized in that, It includes a steam turbine, a high-pressure heating assembly used in conjunction with the steam turbine and the main steam reheat cold section pipeline, an extraction pipe 1 for connecting the steam turbine and the high-pressure heating assembly, an extraction pipe 2 for connecting the main steam reheat cold section pipeline and the high-pressure heating assembly, and an extraction header connected to the extraction pipe 1 and forming a loop. The extraction steam pipe is connected to the inlet of the extraction steam header via a steam storage pipeline, and the outlet of the extraction steam header is connected to the extraction steam pipe via a make-up steam pipeline.

2. The rapid load change thermal system with extraction header according to claim 1, characterized in that, The steam storage pipeline includes a steam storage branch corresponding to and connected to the extraction steam pipe, a steam main pipe for connecting the steam storage branch to the inlet of the extraction steam header, and a steam storage shut-off valve installed on the steam storage branch.

3. A rapid load change thermal system with extraction header according to claim 2, characterized in that, The make-up steam pipeline includes a make-up steam branch that is correspondingly set and connected to the extraction steam pipe one and the extraction steam pipe two, and a steam main pipe two for connecting the make-up steam branch to the outlet of the extraction steam header.

4. A rapid load change thermal system with extraction header according to claim 3, characterized in that, A main shut-off valve is provided on the second main steam pipe; a steam replenishment regulating valve group is provided on the steam replenishment branch; the steam replenishment regulating valve group includes a steam replenishment shut-off valve and a steam replenishment regulating valve arranged sequentially along the steam flow direction.

5. A rapid load change thermal system with extraction header according to claim 3, characterized in that, Temperature monitoring components and pressure monitoring components are respectively installed on the steam storage branch, steam main pipe one, steam main pipe two, and make-up steam branch; the temperature monitoring components and pressure monitoring components are located on the side of the main shut-off valve away from the extraction steam header.

6. A rapid load change thermal system with extraction header according to any one of claims 1-5, characterized in that, The high-pressure heating assembly includes a high-pressure heater one connected to the high-pressure cylinder of the steam turbine via an extraction pipe one, and a high-pressure heater two connected to the low-pressure cylinder or the main steam reheat cold section pipeline of the steam turbine via an extraction pipe two and connected to the high-pressure heater one; the high-pressure heater one and the extraction pipe one are arranged correspondingly; the high-pressure heater one and the high-pressure heater two are connected in sequence according to their pressure levels.

7. A rapid load change thermal system with extraction header according to claim 6, characterized in that, The high-pressure heater consists of two groups, including a No. 0 high-pressure heater and a No. 1 high-pressure heater, which are respectively connected to the high-pressure cylinder of the steam turbine through a steam extraction pipe. The No. 0 high-pressure heater and the No. 1 high-pressure heater are connected in sequence according to their pressure levels.

8. A rapid load change thermal system with extraction header according to claim 6, characterized in that, The second high-pressure heater consists of multiple sets, including a No. 2 high-pressure heater connected to the main steam pipeline via the second extraction steam pipe, and a No. 3 high-pressure heater connected to the low-pressure cylinder of the steam turbine via the second extraction steam pipe; the No. 2 high-pressure heater and the No. 3 high-pressure heater are respectively connected to the second main steam pipe via the supplementary steam branch.

9. A method for regulating a rapidly changing load thermal system with an extraction steam header, characterized in that, A rapid load change thermal system with extraction header as described in any one of claims 1-8; When the generator set is running at non-full load, it is charged with steam. The high-temperature and high-pressure steam in the extraction pipe is transported to the extraction header for storage through the corresponding hydrogen storage branch. When the generator set increases its load, the high-temperature and high-pressure steam in the extraction steam header is transported into the high-pressure heating components through the make-up steam branch.

10. A method for regulating a rapid load-changing thermal system with an extraction steam header according to claim 9, characterized in that, When the generator set needs to increase load, the high-temperature and high-pressure steam from the extraction steam header is sequentially delivered to the high-pressure heating components according to the pressure level through the supplementary steam branch; When the generator set needs to rapidly increase load, all the make-up steam branches are opened at the same time, and the high-temperature and high-pressure steam in the extraction steam header is transported to the corresponding extraction steam pipe one and extraction steam pipe two through the make-up steam branches. The high-temperature and high-pressure steam enters the high-pressure heating assembly through extraction steam pipe one and extraction steam pipe two.

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