A steam supplement system and operation method for steam turbine cylinder cutting operation

Abstract

The present invention discloses a steam replenishment system and operation method for turbine cylinder cutting operation. The steam replenishment system for turbine cylinder cutting operation includes a solar collector for outputting steam. The output end of the solar collector is connected to the low-pressure cylinder through a cooling steam bypass. The cooling steam bypass is provided with a pressure and temperature regulating device for regulating the pressure and temperature of the steam entering the low-pressure cylinder. In the above-mentioned steam replenishment system for turbine cylinder cutting operation, the cooling steam for the low-pressure cylinder comes from the solar collector, enters the low-pressure cylinder after pressure and temperature regulation, cools the main shaft and blades of the low-pressure cylinder, reduces the stress of the last-stage blades, and solves the problem that when the low-pressure cylinder is currently cut off and operated, the cooling steam flow is mainly from the exhaust steam of the medium-pressure cylinder, which reduces the heat extraction flow, and also weakens the deep peak regulation and thermoelectric decoupling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines, and in particular to a steam supplement system for steam turbine cylinder cutting operation, and also to an operation method of the steam supplement system for steam turbine cylinder cutting operation. Background Art

[0002] Before the advent of new energy electricity, energy storage technology and hydrogen energy parity, centralized heating is still the most energy-saving and carbon-emission-minimizing heating method. In order to meet the growing demand for industrial heat and residential heating, a large number of thermal power units have undergone heating transformation. In order to increase the heating capacity and deep peak-shaving capacity of thermal power units, the existing thermal power unit heating flexibility transformation technologies include: bypass heating, light axis heating, high back pressure heating, electric boilers, heat storage devices and low-pressure cylinder cutting, among which the low-pressure cylinder cutting technology has the characteristics of small transformation scope, simple operation and flexible decoupling.

[0003] In the low-pressure cylinder cutting technology, in order to ensure that there is enough cooling steam entering the low-pressure cylinder, the current solutions are as follows: First, add a cooling steam bypass and install a temperature reduction and pressure reduction device, and use a part of the medium-pressure cylinder exhaust steam to cool the main shaft and blades after temperature reduction and pressure reduction. Second, add a cooling steam bypass, but without a temperature reduction and pressure device, and directly pass the medium-pressure cylinder exhaust steam into the low-pressure cylinder to cool the main shaft and blades; Third, use the butterfly valve on the original medium- and low-pressure cylinder connecting pipe to control the steam flow entering the low-pressure cylinder to cool the low-pressure cylinder; Fourth, pass the exhaust steam of the feedwater pump turbine into the low-pressure cylinder as cooling steam. The first three solutions have the same idea, all of which use the exhaust steam of the medium-pressure cylinder, but this part of the steam flow reduces the heat extraction steam flow to a certain extent, weakening the effect of the unit's cylinder cutting operation to improve the unit's heating capacity and deep peak regulation. The fourth solution is to use the exhaust steam of the feedwater pump turbine. The system transformation involved is more complicated than other solutions, and the on-site pipeline layout is also more difficult.

[0004] Therefore, how to provide a steam supplement system for turbine cylinder cutting operation that solves the above problems is a technical problem that those skilled in the art urgently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a steam supplement system for turbine cylinder cutting operation, in which the cooling steam for the low-pressure cylinder comes from the solar collector, enters the low-pressure cylinder after pressure and temperature adjustment, cools the main shaft and blades of the low-pressure cylinder, reduces the stress of the last-stage blades, and solves the problem that when the low-pressure cylinder is cut off, the cooling steam flow mainly comes from the exhaust steam of the medium-pressure cylinder, which reduces the heat extraction steam flow, and also weakens the deep peak regulation and thermal decoupling effect. Another purpose of the present invention is to provide a method for operating a steam supplement system for turbine cylinder cutting operation.

[0006] To achieve the above-mentioned purpose, the present invention provides a steam supplement system for turbine cylinder cutting operation, including a solar collector for outputting steam, wherein the output end of the solar collector is connected to the low-pressure cylinder through a cooling steam bypass, and the cooling steam bypass is provided with a pressure and temperature regulating device for regulating the pressure and temperature of the steam entering the low-pressure cylinder.

[0007] Preferably, an electric heating device for assisting in generating steam is provided at the connection between the solar thermal collector and the cooling steam bypass.

[0008] Preferably, the output end of the solar thermal collector is also provided with a parallel heat storage device, and the heat storage device is used to store and release excess steam output by the solar thermal collector.

[0009] Preferably, the pressure and temperature regulating device comprises a temperature and pressure reducing valve and an electric regulating valve.

[0010] Preferably, the solar thermal collector is used to input condensed water from the output end of the low-pressure heater group to which its input end is connected.

[0011] Preferably, the solar thermal collector is a trough solar thermal collector.

[0012] The present invention further provides a method for operating a steam supplement system for turbine cylinder cutting operation, which is applied to the steam supplement system for turbine cylinder cutting operation as described in any one of the above items, comprising:

[0013] Control the steam output from solar collectors;

[0014] The control steam enters the low-pressure cylinder through the cooling steam bypass.

[0015] Preferably, after the step of controlling the solar thermal collector to output steam, the method further includes: controlling the excess steam output by the solar thermal collector to be stored in a heat storage device.

[0016] Preferably, the step of controlling the steam to enter the low-pressure cylinder through the cooling steam bypass specifically includes:

[0017] Determine whether the steam parameters of the steam output by the solar thermal collector meet the requirements. If the steam of the solar thermal collector meets the requirements, control the steam to enter the low-pressure cylinder through the cooling steam bypass. If the steam of the solar thermal collector does not meet the requirements, determine whether the steam parameters of the steam stored in the heat storage device meet the requirements.

[0018] If the steam of the heat storage device meets the requirements, the steam is controlled to enter the low-pressure cylinder through the cooling steam bypass. If the steam of the heat storage device does not meet the requirements, the electric heating device is started to make the steam parameters of the steam meet the requirements, and then the steam is controlled to enter the low-pressure cylinder through the cooling steam bypass.

[0019] Preferably, the steam parameters include steam temperature, steam pressure and steam flow rate.

[0020] Compared with the above background technology, the steam supplement system for turbine cylinder cutting operation provided by the present invention includes a solar collector, the output end of the solar collector is connected to a cooling steam bypass, and is connected to a low-pressure cylinder through the cooling steam bypass, and a pressure and temperature regulating device is provided in the cooling steam bypass; the steam supplement system for turbine cylinder cutting operation uses a solar collector to convert water into steam, and the steam generated by the solar collector enters the cooling steam bypass from the output end, and the pressure and temperature regulating device in the cooling steam bypass regulates the pressure and temperature of the steam, so that the regulated steam is passed into the low-pressure cylinder as cooling steam suitable for the low-pressure cylinder, thereby achieving The cooling steam is supplemented when the low-pressure cylinder is cut off. Under the action of the cooling steam, the main shaft and blades of the low-pressure cylinder are cooled, and the stress of the last-stage blades is reduced. Compared with the problem in the prior art that the cooling steam flow mainly comes from the exhaust steam of the intermediate-pressure cylinder, thereby reducing the heating steam extraction flow and weakening the deep peak regulation and thermal-electric decoupling effects, the cooling steam of the steam supplement system for turbine cylinder cutting operation comes from solar collectors, which not only increases the heating steam extraction flow to improve the heating capacity of the unit, but also makes the unit have a lower electrical load under the condition of the same heating amount, and can further reduce the coal consumption of thermal power units for power generation, and use clean energy to achieve energy conservation and emission reduction of thermal power units. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a steam supplement system for turbine cylinder cutting operation provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a method for operating a steam supplement system for turbine cylinder cutting operation provided in an embodiment of the present invention.

[0024] in:

[0025] 1-solar collector, 2-heat storage device, 3-electric heating device, 4-cooling steam bypass, 5-low-pressure cylinder, 6-condenser, 7-low-pressure heater group. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Please refer to Figure 1 and Figure 2 ,in, Figure 1 A schematic diagram of a steam supplement system for turbine cylinder cutting operation provided by an embodiment of the present invention, Figure 2 A schematic diagram of a method for operating a steam supplement system for turbine cylinder cutting operation provided in an embodiment of the present invention.

[0029] In a first specific embodiment, the steam supplement system for turbine cylinder cutting operation provided by the present invention includes a solar collector 1. The function of the solar collector 1 is to convert input water into steam and output it. The output end of the solar collector 1 is connected to a pipeline, namely a cooling steam bypass 4, and then connected to a low-pressure cylinder 5 through the cooling steam bypass 4. A pressure and temperature regulating device is provided in the cooling steam bypass 4. The function of the pressure and temperature regulating device is to regulate the pressure and temperature of the steam in the pipeline so that it meets the requirements of cooling steam for the low-pressure cylinder 5.

[0030] It should be noted that in order to increase the heating capacity and deep peak-shaving capacity of thermal power units, the thermal power unit heating flexibility transformation technology is adopted; among them, for the low-pressure cylinder cutting technology, the low-pressure cylinder cutting operation can not only increase the heating capacity of the unit, but also reduce the unit's power generation power, so that the unit can better perform deep peak-shaving and provide space for renewable energy power to access the Internet. The principle of the low-pressure cylinder cutting technology is to cut off the steam inlet of the low-pressure cylinder 5 by controlling the butterfly valve switch on the low-pressure cylinder connecting pipe during the heating period, and at the same time, a small amount of cooling steam is introduced into the low-pressure cylinder 5 to maintain a certain fluidity to take away the blast heat and ensure that the dynamic stress and temperature of the blades of the low-pressure cylinder 5 are within the safe operating range. When the heating unit is cutting the cylinder, the steam inlet flow and temperature of the low-pressure cylinder 5 must be strictly controlled. Only when the flow is within a certain range can the stress of the long blades of the last stage be guaranteed to be within the safe range. At the same time, the lower the steam inlet temperature, the better the temperature of the last-stage blades can be controlled within the safe range, or water spraying is performed at the last stage to reduce the temperature to control the blade temperature. If the steam inlet flow rate of the low-pressure cylinder 5 is large, on the one hand, the effect of increasing the heating capacity and reducing the power generation capacity by cutting the cylinder will be weakened, and on the other hand, the increase in the steam inlet flow rate may increase the dynamic stress of the last-stage blades; if the steam inlet flow rate of the low-pressure cylinder 5 is too small, it is easy to produce a blast effect and increase the temperature of the last-stage blades.

[0031] This embodiment does not change the above-mentioned low-pressure cylinder cutting technology, but on the basis of the above-mentioned technology, improves the source of cooling steam for the low-pressure cylinder 5. Compared with the problem in the prior art that the cooling steam flow rate mainly comes from the exhaust steam of the medium-pressure cylinder, thereby reducing the heating steam extraction flow rate and weakening the deep peak regulation and thermoelectric decoupling effects, the cooling steam of the steam supplement system for turbine cylinder cutting operation comes from the solar collector 1, which not only increases the heating steam extraction flow rate to improve the heating capacity of the unit, but also makes the unit have a lower electrical load under the condition of the same heating amount, and at the same time can further reduce the coal consumption of thermal power units for power generation, and use clean energy to achieve energy conservation and emission reduction of thermal power units.

[0032] During operation, the steam supplement system for turbine cylinder cutting operation utilizes the solar collector 1 to convert water into steam. The steam generated by the solar collector 1 enters the cooling steam bypass 4 from the output end. The pressure and temperature regulating device in the cooling steam bypass 4 regulates the pressure and temperature of the steam, so that the regulated steam is used as cooling steam suitable for the low-pressure cylinder 5 and passes into the low-pressure cylinder 5, thereby realizing the supplement of cooling steam when the low-pressure cylinder is cut off. Under the action of the cooling steam, the main shaft and blades of the low-pressure cylinder 5 are cooled, the stress of the last-stage blades is reduced, and the above-mentioned low-pressure cylinder cutting technology is realized.

[0033] In this embodiment, the pressure and temperature regulating device includes a temperature and pressure reducing valve and an electric regulating valve.

[0034] In a specific embodiment, the system is also provided with an electric heating device 3 for assisting in generating steam. The electric heating device 3 is an electric heater. The electric heating device 3 is located at the connection between the solar collector 1 and the cooling steam bypass 4 and can assist in heating the steam before the steam enters the cooling steam bypass 4.

[0035] In this embodiment, when the steam parameters of the steam passing into the cooling steam bypass 4 are low, such as in rainy days, the steam parameters will be affected. At this time, the electric heating device 3 can be turned on to increase the steam parameters of the steam, so that the system can ensure the supply of cooling steam in rainy days and other situations.

[0036] In a specific embodiment, the system is further provided with a heat storage device 2 for storing excess steam. The heat storage device 2 can be a tank-shaped pressurized steam heat storage tank. As for the heat storage devices 2 with other structures, they should also belong to the description scope of this embodiment; wherein, the heat storage device 2 is connected to the output end of the solar collector 1. At this time, the output end of the solar collector 1 has two routes to the electric heating device 3 in the same direction, one of which is directly connected to the electric heating device 3, and the other is connected to the electric heating device 3 through the heat storage device 2, and the two are in a parallel control relationship.

[0037] In this embodiment, when the solar thermal collector 1 has excess production capacity, excess steam can be stored in the heat storage device 2, so that the system can be used not only during the day when the sun is shining, but also at night and other times. The use in such situations can be met by simply opening the output end of the heat storage device 2 storing excess steam.

[0038] like Figure 1 In a specific structure shown, the supplementary system is connected to the original steam turbine system. At this time, the condensate in the original system can be used. The medium-pressure cylinder in the original system is connected to the low-pressure cylinder 5 through the medium- and low-pressure cylinder connecting pipe. After the low-pressure cylinder 5 is connected together with the low-pressure cylinder connecting pipe and the cooling steam bypass 4, it is connected to the condenser 6. The condenser 6 is then connected to the low-pressure heater group 7. At this time, the input end of the solar collector 1 is connected to the low-pressure heater group 7, and the condensate at the output end of the low-pressure heater group 7 is received to realize the water supply to the solar collector 1, thereby achieving the effect of system circulation.

[0039] It should be noted that there are various structural forms of the solar thermal collector 1, including but not limited to trough-type solar thermal collectors, and other structural forms should also fall within the scope of the description of this embodiment.

[0040] For example, when the solar collector 1 is a trough solar collector, trough solar collector is a solar thermal utilization method of focusing collector type. According to the collector medium, trough solar collector can be divided into two types: one is to heat water into steam directly in the collector (steam directly generates the collector system); the other is to use heat transfer oil as the heat exchange fluid, and then use the heat transfer oil to heat water into high-temperature and high-pressure steam. The direct solar radiation is reflected and focused on the vacuum collector tube at the focal line of the parabola by a linear trough parabolic concentrator to heat the heat transfer medium in the collector tube. The vacuum tube is coaxial with the parabolic trough and the instrument tracks the sun. Since the trough system concentration ratio is generally around 50-150, the temperature of the heat transfer medium (water or heat transfer oil) at the outlet of the vacuum collector tube is generally not higher than 400°C.

[0041] In this embodiment, each circuit of the trough solar collector can be arranged in parallel, so the capacity of the collector field can be designed as needed and the layout is flexible; the trough solar collector can generate steam with a temperature generally within 400°C and a pressure within 5MPa; and when the low-pressure cylinder of a 300MW-level steam turbine generator set is cut off, the temperature of the cooling steam is within 350°C and the pressure is generally 0.2-0.5MPa, and the cooling steam flow rate required for each low-pressure cylinder 5 is approximately 10-30t / h; this further confirms that the cooling steam generated by the trough solar collector can meet the requirements and is an optimal collector solution.

[0042] Exemplarily, the system adopts a trough-type solar thermal collection system of direct steam generation collection technology (DSG) to directly generate steam as cooling steam for the low-pressure cylinder 5, solving the problem that when the low-pressure cylinder is currently cut off from the cylinder, the cooling steam flow is mainly from the exhaust steam of the medium-pressure cylinder, thereby reducing the heat extraction steam flow, and also weakening the deep peak regulation and thermoelectric decoupling effects.

[0043] In a specific working process, when the heating unit is in cylinder cutting operation, the butterfly valve on the medium and low pressure cylinder connecting pipe is completely closed. At this time, the heating unit is equivalent to a back pressure steam turbine, and all the medium pressure cylinder exhaust steam is used as heating extraction steam, and the economy of the entire heating unit is the best. The solar collector 1 takes water from the outlet of the low pressure heater group 7. The steam directly generated after passing through the solar collector 1 can enter the cooling steam bypass 4 through a route directly. The temperature reduction valve and the electric regulating valve enter the low pressure cylinder 5 to cool the main shaft and blades of the low pressure cylinder 5; when the solar radiation is strong and the solar collector 1 generates more steam, the extra steam can enter the heat storage device 2 through another route for storage; at night or on rainy days with weak solar radiation, the cooling steam is mainly output by the heat storage device 2 and enters the cooling steam bypass 4. When the heat storage device 2 is insufficient or the steam parameters at the outlet of the solar collector 1 are low, the electric heating device 3 can be turned on, and the steam of the two routes is heated by the electric heating device 3 to reach the specified cooling steam parameters to meet the needs of cooling the main shaft and rotor of the low pressure cylinder 5.

[0044] The above system has the following advantages. First, by using the steam generated by the trough type solar thermal collector instead of the exhaust steam of the medium pressure cylinder as the cooling steam of the low pressure cylinder 5, the flow rate of the heat extraction steam can be increased, which not only improves the heating capacity of the system to achieve deep decoupling of heat and electricity, but also reduces fuel consumption, thereby achieving economic and environmental benefits. Second, by using the heat storage device 2 and the electric heating device 3 together, the system can continue to operate at night or on rainy days. When the electric heating device 3 is put into use, the on-grid power of the thermal power unit can also be reduced, further increasing the peak regulation depth of the unit.

[0045] The present invention also provides a method for applying the above-mentioned steam supplement system for turbine cylinder cutting operation, which is a method for operating the steam supplement system for turbine cylinder cutting operation, comprising a first step of controlling the solar collector 1 to output steam, and a second step of controlling the steam to enter the low-pressure cylinder 5 through the cooling steam bypass 4.

[0046] In this embodiment, the method is applicable to the above-mentioned system, and the solar collector 1 of the above-mentioned system is controlled to work. The solar collector 1 converts water into steam and outputs it. The steam that meets the requirements of cooling steam for the low-pressure cylinder 5 is passed into the low-pressure cylinder 5 after pressure and temperature adjustment through the cooling steam bypass 4, so as to realize the supplement of cooling steam when the low-pressure cylinder is cut off. Under the action of the cooling steam, the main shaft and blades of the low-pressure cylinder 5 are cooled, the stress of the last-stage blades is reduced, and the above-mentioned low-pressure cylinder cutting technology is realized.

[0047] In addition, after the step of controlling the solar thermal collector 1 to output steam, the method further includes: controlling the excess steam output by the solar thermal collector 1 to be stored in the heat storage device 2 .

[0048] In this embodiment, when the solar collector 1 outputs steam and passes it backward to the cooling steam bypass 4, it has two parallel routes. One route directly sends the generated steam into the cooling steam bypass 4. When the solar radiation is strong and the solar collector 1 generates more steam, the excess steam can enter the heat storage device 2 through another route for storage.

[0049] In addition, the step of controlling the steam to enter the low-pressure cylinder 5 through the cooling steam bypass 4 specifically includes: judging whether the steam parameters of the steam output by the solar collector 1 meet the requirements; if the steam of the solar collector 1 meets the requirements, controlling the steam to enter the low-pressure cylinder 5 through the cooling steam bypass 4; if the steam of the solar collector 1 does not meet the requirements, judging whether the steam parameters of the steam stored in the heat storage device 2 meet the requirements; if the steam of the heat storage device 2 meets the requirements, controlling the steam to enter the low-pressure cylinder 5 through the cooling steam bypass 4; if the steam of the heat storage device 2 does not meet the requirements, starting the electric heating device 3 to make the steam parameters of the steam meet the requirements, and then controlling the steam to enter the low-pressure cylinder 5 through the cooling steam bypass 4.

[0050] It should be noted that the above steam parameters include steam temperature, steam pressure and steam flow rate.

[0051] like Figure 2 , in a specific judgment process:

[0052] S1. First determine whether the temperature and pressure of the steam at the outlet of the solar collector 1 meet the requirements. If they do, execute S2.1. If they do not, execute S2.2.

[0053] S2.1, determine whether the steam flow rate at the outlet of the solar collector 1 meets the requirements. If it does, execute S3.1; if it does not, execute S2.2;

[0054] S2.2, determine whether the steam parameters and flow rate in the heat storage device 2 meet the requirements. If they do, execute S3.2; if they do not, execute S3.3;

[0055] S3.1, steam enters the low pressure cylinder 5 through the cooling steam bypass 4, and the excess steam is stored in the heat storage device 2;

[0056] S3.2, steam enters the cooling steam bypass 4 from the heat storage device 2 and then enters the low pressure cylinder 5;

[0057] S3.3. Start the electric heating device 3 to make the steam parameters meet the cooling steam requirements.

[0058] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0059] The above is a detailed introduction to the steam supplement system and operation method for turbine cylinder cutting operation provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for operating a steam supplement system for turbine cylinder cutting operation, characterized in that: The steam replenishment system comprises a solar collector (1) for outputting steam, wherein the output end of the solar collector (1) is connected to a low-pressure cylinder (5) through a cooling steam bypass (4), wherein the low-pressure cylinder (5) is provided with a main shaft and blades, and wherein a pressure and temperature regulating device for regulating the pressure and temperature of steam passing into the low-pressure cylinder (5) is provided in the cooling steam bypass (4); The steam supplement system operation method for turbine cut-off operation includes: Controlling the solar collector (1) to output steam; Controlling steam to enter the low pressure cylinder (5) through the cooling steam bypass (4); After the step of controlling the solar thermal collector (1) to output steam, the method further includes: controlling the excess steam output by the solar thermal collector (1) to be stored in a heat storage device (2); The step of controlling the steam to enter the low-pressure cylinder (5) through the cooling steam bypass (4) specifically comprises: Determining whether the steam parameters of the steam output by the solar thermal collector (1) meet the requirements; if the steam of the solar thermal collector (1) meets the requirements, controlling the steam to enter the low-pressure cylinder (5) through the cooling steam bypass (4); if the steam of the solar thermal collector (1) does not meet the requirements, determining whether the steam parameters of the steam stored in the heat storage device (2) meet the requirements; If the steam in the heat storage device (2) meets the requirements, the steam is controlled to pass through the cooling steam bypass (4) and enter the low-pressure cylinder (5); if the steam in the heat storage device (2) does not meet the requirements, the electric heating device (3) is started to make the steam parameters of the steam meet the requirements, and then the steam is controlled to pass through the cooling steam bypass (4) and enter the low-pressure cylinder (5).

2. The method for operating a steam supplement system for turbine cylinder cutting operation according to claim 1, characterized in that: The steam parameters include steam temperature, steam pressure and steam flow rate.

3. The method for operating a steam supplement system for steam turbine cylinder cutting operation according to claim 1, characterized in that: An electric heating device (3) for assisting in generating steam is provided at the connection between the solar thermal collector (1) and the cooling steam bypass (4).

4. The method for operating a steam supplement system for steam turbine cylinder cutting operation according to claim 1, characterized in that: The output end of the solar thermal collector (1) is also provided with a parallel heat storage device (2), and the heat storage device (2) is used to store and release excess steam output by the solar thermal collector (1).

5. The method for operating a steam supplement system for steam turbine cylinder cutting operation according to any one of claims 1 to 4, characterized in that: The pressure and temperature regulating device comprises a temperature and pressure reducing valve and an electric regulating valve.

6. The method for operating a steam supplement system for steam turbine cylinder cutting operation according to any one of claims 1 to 4, characterized in that: The solar thermal collector (1) is used to input condensed water from the output end of a low-pressure heater group (7) connected to its input end.

7. The method for operating a steam supplement system for steam turbine cylinder cutting operation according to any one of claims 1 to 4, characterized in that: The solar thermal collector (1) is a trough type solar thermal collector.

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