Steam extraction system adopting seat cylinder valve for cylinder switching transformation
By using seat cylinder valves in industrial steam extraction systems for cylinder cutting transformation, the problem of insufficient heating capacity in the existing system at low electric load is solved, and the effect of improving peak shaving and heating capacity is achieved.
Patent Information
- Application Number
- CN202510190480.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-05-13
AI Technical Summary
The existing industrial steam extraction system is difficult to meet the large flow heating capacity when the electric load is low, and the peak shaving capacity is insufficient, so it cannot adapt to the needs of the development of new energy.
By using seat cylinder valves in the industrial steam extraction system for cylinder cutting transformation, the steam flow between the upstream section and the downstream section is cut off, so that the steam flowing in the upstream section is directly sent to the industrial steam extraction user end, leaving only a small amount of cooling steam to cool downstream section flow components.
The industrial steam supply at the seat cylinder valve is increased, the electrical load of the unit is reduced, the peak shaving capacity and heating capacity of the unit are enhanced, and the large flow heating needs can be met at lower electric loads.
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Figure CN119982116A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of cogeneration, in particular to a steam extraction system which adopts a seat cylinder valve for cylinder cutting transformation. Background Art
[0002] At present, with the continuous development of new energy sources such as wind, solar, and storage in my country, the power grid has higher and higher requirements for peak load regulation of thermal power units. The energy status of thermal power units has changed from the main energy to the bottom-line guarantee energy, and the peak load requirements are getting lower and lower. However, for thermal power units with combined heat and power generation, on the one hand, they must meet the requirements of deep peak regulation, while on the other hand, the industrial steam supply capacity has not been reduced. Therefore, the operation mode of the heating unit based on heat to determine electricity will no longer adapt to the development of electricity. It is necessary to decouple heat and electricity, and still meet the large flow heating capacity when the electricity load is low. Therefore, it is necessary to transform the existing industrial steam extraction system so that it can improve the peak regulation capacity and heating capacity of the unit, and still meet the large flow heating capacity when the electricity load is low. Summary of the invention
[0003] The purpose of the present invention is to provide an industrial steam extraction system that uses a seat cylinder valve for cylinder cutting transformation and can effectively improve the peak-shaving capacity and heating capacity of the unit and can still meet the large-flow heating capacity when the electrical load is relatively low.
[0004] The technical purpose of the present invention is achieved by the following technical solutions: An industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation comprises a turbine flow; corresponding to the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder, the turbine flow comprises a high-pressure flow, a medium-pressure flow and a low-pressure flow; a seat cylinder valve is provided at a certain stage in the middle of the medium-pressure flow; the seat cylinder valve divides the turbine flow into an upstream section flow and a downstream section flow; the upstream section flow comprises a high-pressure flow and an upstream medium-pressure flow on the upstream side of the seat cylinder valve; the downstream section flow comprises a downstream medium-pressure flow and a low-pressure flow on the downstream side of the seat cylinder valve; the medium-pressure flow is provided with a cooling bypass, one end of the cooling bypass is connected to the end of the upstream medium-pressure flow, and the other end is connected to the starting end of the downstream medium-pressure flow; the cooling steam enters the downstream section flow through the cooling bypass; when the cylinder is cut off, the seat cylinder valve is used to cut off the steam flow between the upstream section flow and the downstream section flow, and the steam drawn out of the upstream section flow is sent to the industrial steam extraction user end through the steam extraction pipe at the seat cylinder valve.
[0005] Preferably, a three-way valve is provided on the steam extraction pipe at the seat cylinder valve; through the three-way valve, the steam extraction in the upstream section of the seat cylinder valve is sent to the industrial steam user end, one way is extracted to cool and reduce pressure and remove oxygen from the deoxidizer, and one way is extracted to the small back pressure machine.
[0006] Preferably, the small back pressure machine is provided with a heat recovery steam extraction port, and the heat recovery steam extraction port is connected to a low-pressure heater; the extraction steam of the small back pressure machine directly heats the circulating water through the low-pressure heater.
[0007] Preferably, the steam exhaust port of the low-pressure cylinder is connected to the steam inlet of the condenser through a pipeline; the condenser also includes a water supply pipe connection port connected to the water supply pipe, a condensate connection port connected to the condensate pipeline of the low-pressure heater, and a condensate drain port connected to the first water inlet of the deaerator through a condenser drain pipeline.
[0008] Preferably, the low-pressure heater comprises a plurality of low-pressure heaters connected in series on the first thermal circulation water pipeline; the condensed water formed after the low-pressure heater heats the first thermal circulation water pipeline is sent to the condensed water connection port through the low-pressure heater condensed water pipeline.
[0009] Preferably, the deaerator is connected in series with a plurality of high-pressure heaters via a second thermal circulation water pipeline; The steam inlet of the high-pressure heater is connected to the steam extraction port of the high-pressure cylinder, and the condensed water formed after heating the circulating water in the second thermal circulating water pipeline is connected to the second water inlet of the deaerator through the condensate drain port of the high-pressure heater and the condensate pipeline of the high-pressure heater; one end of the second thermal circulating water pipeline is connected to the drain port of the deaerator, and the other end thereof is connected to the circulating water inlet of the thermal system of the boiler.
[0010] Preferably, a flow control valve is provided on the cooling bypass.
[0011] Preferably, the intermediate-pressure last-stage blades and the low-pressure last-stage blades of the intermediate-pressure cylinder and the low-pressure cylinder are additionally provided with thermocouple temperature monitoring devices for real-time monitoring of the blade blowing conditions.
[0012] Preferably, cooling water nozzles are provided near the last two low-pressure blades to reduce the operating temperature of the rotor and blades.
[0013] Preferably, the cooling water nozzle is arranged on the exhaust guide ring of the low-pressure cylinder; the spraying direction of the cooling water nozzle points into the flow channel and forms an angle with the central axis of the steam turbine.
[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a seat cylinder valve to cut off the downstream section flow on the downstream side of the seat cylinder valve, so that the steam of the upstream section flow on the upstream side of the seat cylinder valve is directly sent to the industrial steam extraction user end, leaving only a small amount of cooling steam to cool the downstream section flow components on the downstream side of the seat cylinder valve, greatly improving the industrial steam supply at the seat cylinder valve; at the same time, the downstream section flow no longer does work, so that the unit's electrical load is reduced, and the unit's deep peak-shaving capacity is improved. Therefore, the present invention can effectively improve the unit's peak-shaving capacity and heating capacity, and can still meet the large flow heating capacity when the electrical load is relatively low. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure numerals: 1—high-pressure cylinder; 101—first high-pressure heater; 102—second high-pressure heater; 103—high-pressure heater condensate pipeline; 2—medium-pressure cylinder; 3—low-pressure cylinder; 4—seat cylinder valve; 5—cooling bypass; 6—steam extraction pipe at seat cylinder valve; 7—industrial steam extraction user end; 8—small back pressure machine; 801—first low-pressure heater; 802—second low-pressure heater; 803—low-pressure heater condensate pipeline; 9—deaerator; 10—condenser; 11—boiler; 12—water supply pipe; 13—first thermal circulation water pipeline; 14—second thermal circulation water pipeline. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.
[0018] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0019] like Figure 1As shown, an industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation includes a turbine flow; corresponding to the high-pressure cylinder 1, the medium-pressure cylinder 2 and the low-pressure cylinder 3, the turbine flow includes high-pressure flow, medium-pressure flow and low-pressure flow; a seat cylinder valve 4 is provided at a certain stage in the middle of the medium-pressure flow; the seat cylinder valve 4 divides the turbine flow into an upstream section flow and a downstream section flow; the upstream section flow includes a high-pressure flow and an upstream medium-pressure flow on the upstream side of the seat cylinder valve 4; the downstream section flow includes a downstream medium-pressure flow and a low-pressure flow on the downstream side of the seat cylinder valve 4; the medium-pressure flow is provided with a cooling bypass 5, one end of the cooling bypass 5 is connected to the end of the upstream medium-pressure flow, and the other end is connected to the starting end of the downstream medium-pressure flow; the cooling steam enters the downstream section flow through the cooling bypass 5. During the cylinder cutting operation, the seat cylinder valve 4 is used to cut off the steam flow between the upstream section flow and the downstream section flow, and the steam drawn out of the upstream section flow is sent to the industrial steam extraction user end 7 through the extraction pipe 6 at the seat cylinder valve. In actual use, the downstream section flow on the downstream side of the seat cylinder valve 4 is cut off through the seat cylinder valve 4, so that the steam flowing in the upstream section on the upstream side of the seat cylinder valve 4 is directly sent to the industrial steam extraction user end 7, leaving only a small amount of cooling steam to cool the downstream section flow components on the downstream side of the seat cylinder valve 4, greatly improving the industrial steam supply at the seat cylinder valve 4; at the same time, the downstream section flow no longer does work, which reduces the unit's electrical load and improves the unit's deep peak-shaving capability. Therefore, the use of this technical measure can effectively improve the unit's peak-shaving capability and heating capacity, and can still meet the large flow heating capacity when the electrical load is relatively low.
[0020] like Figure 1 As shown, the medium-pressure cylinder 2 is arranged in the middle, the high-pressure cylinder 1 and the boiler 11 are arranged in the upstream, and the low-pressure cylinder 3 and the condenser 10 are arranged in the downstream. Corresponding to the high-pressure cylinder 1, the medium-pressure cylinder 2 and the low-pressure cylinder 3, the turbine flow includes the high-pressure flow in the upstream, the medium-pressure flow in the middle and the low-pressure flow in the downstream. A seat cylinder valve 4 is provided at a certain level in the middle of the medium-pressure flow; the seat cylinder valve 4 divides the turbine flow into the upstream section flow and the downstream section flow. The downstream section flow components include a part of the medium-pressure cylinder 2 provided with the downstream medium-pressure flow and the low-pressure cylinder 3. Among them, the seat cylinder valve 4 is arranged before / after a certain level in the middle of the medium-pressure flow; which level to set after needs to be determined according to the industrial steam extraction parameters, the higher the parameters, the more likely it is to be placed in front, and the lower the parameters, the more likely it is to be placed in the back. The industrial steam extraction parameters mainly include key indicators such as the pressure and temperature of the steam extraction, and the specific values are determined according to the needs of industrial users. In the specific implementation, it can be considered to be designed after which level in the middle according to which level is close to the steam extraction pressure and the flow level design pressure.
[0021] A cooling bypass 5 is provided in the medium-pressure flow, one end of which is connected to the end of the upstream medium-pressure flow, and the other end is connected to the start end of the downstream medium-pressure flow; the cooling steam enters the downstream section through the cooling bypass 5, and the seat cylinder valve 4 divides the medium-pressure flow into the upstream medium-pressure flow on the upstream side of the seat cylinder valve 4 and the downstream medium-pressure flow on the downstream side of the seat cylinder valve 4. One end of the cooling bypass 5 is connected to the end of the upstream medium-pressure flow, and the other end is connected to the start end of the downstream medium-pressure flow, so that the cooling bypass 5 connects the upstream section flow and the downstream section flow. The safety of the downstream section flow is guaranteed. In actual use, a flow control valve is provided on the cooling bypass 5. The flow control valve is mainly used to adjust and control the fluid flow in the cooling bypass 5 to ensure the stability and efficiency of the system. A three-way valve is provided on the extraction pipe 6 at the seat cylinder valve; through the three-way valve, the extraction steam on the upstream side of the seat cylinder valve 4 is sent to the industrial steam user end, one way is extracted to reduce temperature and pressure and remove oxygen 9, and one way is extracted to the small back pressure machine 8. The advantage of setting a three-way valve at the extraction pipe 6 at the seat cylinder valve is that it can flexibly adjust the flow direction and purpose of steam to meet different industrial needs and energy utilization requirements, thereby improving energy utilization efficiency and production benefits. Specifically, one way goes to the industrial steam user end: this meets the demand for steam from industrial users and ensures the stability and reliability of steam supply. At the same time, this setting also improves the utilization rate of steam, so that energy is more reasonably distributed and utilized; one way extracts steam to reduce temperature and pressure and remove oxygen from the deaerator 9: this helps to adjust the temperature and pressure of steam to meet the specific requirements of the deaerator 9. Through the temperature reduction and pressure reduction treatment, the steam can better adapt to the working conditions of the deaerator 9, thereby improving the deoxidation efficiency and ensuring the safety and stability of the water quality of the boiler 11. One way extracts steam into the small back pressure machine 8: this further expands the scope of steam utilization, so that steam can be used to drive equipment such as the small back pressure machine 8, thereby realizing the cascade utilization and efficient conversion of energy. This setting not only improves the efficiency of energy utilization, but also helps to reduce production costs and environmental pollution.
[0022] In the specific implementation, the small back pressure machine 8 is provided with a heat recovery steam extraction port, and the heat recovery steam extraction port is connected to the low-pressure heater; the steam extraction of the back pressure machine directly heats the circulating water through the low-pressure heater. The adoption of this technical measure improves the energy utilization efficiency and system flexibility. Specifically, the small back pressure machine 8 extracts part of the steam through the heat recovery steam extraction port, and this part of the steam enters the low-pressure heater directly without condensation. In the low-pressure heater, the steam exchanges heat with the circulating water to heat the circulating water, thereby increasing the temperature of the circulating water and providing the system with a higher temperature feed water. This process not only makes full use of the thermal energy of the steam and avoids heat loss during the condensation process, but also improves the energy utilization efficiency of the entire system. Since the steam extraction of the small back pressure machine 8 can directly enter the low-pressure heater, the steam extraction amount and heating temperature can be flexibly adjusted according to the actual needs and operating conditions of the system. This flexibility enables the system to better adapt to different operating conditions and improves the stability and reliability of the system. Therefore, the small back pressure machine 8 is provided with a heat recovery steam extraction port, and its design of extracting steam directly to the low-pressure heater to heat the circulating water not only improves the energy utilization efficiency, but also increases the flexibility of the system, providing a strong guarantee for the stable operation of the system.
[0023] The exhaust port of the low-pressure cylinder 3 is connected to the steam inlet of the condenser through a pipeline; the condenser also includes a water supply pipe 12 connection port connected to the water supply pipe 12, a condensate connection port connected to the low-pressure heater condensate pipeline 803, and a condensate drain port connected to the first water inlet of the deaerator 9 through the first thermal circulation water pipeline 13. In actual use, the thermal system needs to be replenished with water after industrial steam extraction. The condenser is provided with a water supply pipe 12 connection port connected to the water supply pipe 12, which is used to replenish the water required by the system to ensure the normal operation of the thermal system. By setting the condensate connection port, the condenser can recycle and utilize the condensate in the low-pressure heater, thereby improving the energy utilization efficiency. The condensate drain port of the condenser is connected to the first water inlet of the deaerator 9 through the first thermal circulation water pipeline 13. Technical measures are adopted to discharge the condensate generated in the condenser and send it to the deaerator 9 for treatment to ensure that the water supply quality is qualified and provide high-quality water supply for the subsequent links of the thermal system.
[0024] The low-pressure heater includes a plurality of low-pressure heaters connected in series on the first thermal circulation water pipeline 13; the condensed water formed after the low-pressure heater heats the first thermal circulation water pipeline 13 is sent to the condensed water connection port through the low-pressure heater condensed water pipeline 803. Specifically, the low-pressure heater includes a first low-pressure heater 801 and a second low-pressure heater 802 connected to the first heat recovery steam extraction port and the second heat recovery steam extraction port of the small back pressure machine 8; the first low-pressure heater 801 and the second low-pressure heater 802 are connected in series with the first thermal circulation water pipeline 13 of the condenser; the condensed water formed after the first low-pressure heater 801 and the second low-pressure heater 802 heat the first thermal circulation water pipeline 13 is sent to the condensed water connection port through the low-pressure heater condensed water pipeline 803. The adoption of this technical measure realizes the effective heating of the circulating water and the recycling of the condensed water, providing a strong guarantee for the stable operation of the thermal system.
[0025] The deaerator 9 is connected in series with a plurality of high-pressure heaters through the second thermal circulation water pipeline 14; the steam inlet of the high-pressure heater is connected to the steam extraction port of the high-pressure cylinder 1, and the condensed water formed after heating the circulating water of the second thermal circulation water pipeline 14 is connected to the second water inlet of the deaerator 9 through the high-pressure heater condensed water drain port and the high-pressure heater condensed water pipeline 103; one end of the second thermal circulation water pipeline 14 is connected to the deaerator 9 drain port, and the other end thereof is connected to the thermal system circulating water inlet of the boiler 11. In a specific implementation, the high-pressure heater includes a first high-pressure heater 101 and a second high-pressure heater 102 connected to the first steam extraction port and the second steam extraction port of the high-pressure cylinder 1; the condensed water formed after the first high-pressure heater 101 and the second high-pressure heater 102 heat the circulating water of the second thermal circulation water pipeline 14, and is connected to the second water inlet of the deaerator 9 through the high-pressure heater condensed water drain port and the high-pressure heater condensed water pipeline 103; one end of the second thermal circulation water pipeline 14 is connected to the deaerator 9 drain port, and the other end thereof is connected to the thermal system circulating water inlet of the boiler 11. The adoption of this technical measure increases the flexibility and reliability of the system and provides stable and high-quality feed water for the thermal system of boiler 11.
[0026] Thermocouple temperature monitoring devices (not shown in the figure) are added to the intermediate pressure last stage blades and the low pressure last two stage blades of the intermediate pressure cylinder 2 and the low pressure cylinder 3 for real-time monitoring of the blade blowing conditions. During the cylinder cutting operation, the intermediate pressure cylinder 2 and the low pressure cylinder 3 on the downstream side of the seat cylinder valve 4 are in the blowing state, which will cause the blade rotor working temperature to rise, affecting the safety and life of the unit. By setting the cooling bypass 5, this bypass structure ensures that the downstream section on the downstream side of the seat cylinder valve 4 has a minimum cooling steam flow rate to cool the rotor blades. A thermocouple temperature monitoring device is added to the intermediate pressure last stage blades and the low pressure last two stage blades to monitor the blade blowing conditions in real time. This technical measure is adopted to keep the blades within the normal operating temperature range to prevent damage caused by excessive temperature. At the same time, the newly added thermocouple temperature monitoring device can feedback the blade blowing conditions in real time, providing important monitoring data for the operating personnel, so that timely measures can be taken, such as adjusting the cooling steam flow rate, to ensure the safe and stable operation of the unit.
[0027] Cooling water nozzles (not shown) are provided near the last two low-pressure blades to reduce the operating temperature of the rotor and blades. This technical measure can ensure that the last two low-pressure blades and the rotors near them can be maintained within a safe operating temperature range during the operation of the turbine. Since these components are subject to the impact and friction of high-temperature steam during operation, they are prone to generate high temperatures. In order to prevent damage caused by excessive temperature, cooling water nozzles are specially provided. The cooling water nozzles take away the heat from the surface of the blades and rotors by spraying cooling water, thereby reducing their operating temperature. This cooling method not only helps to extend the service life of the blades and rotors, but also improves the operating efficiency and stability of the entire turbine.
[0028] The cooling water nozzle is arranged on the exhaust guide ring (not shown) of the low-pressure cylinder 3; the spray direction of the cooling water nozzle points to the flow channel and has an angle with the central axis of the steam turbine. This technical measure is adopted to optimize the cooling effect of the low-pressure cylinder 3. The cooling water nozzle is installed on the exhaust guide ring to ensure that the cooling water is directly sprayed to the area that needs to be cooled. The spray direction points to the flow channel, so that the cooling water can directly act on the hot air flow in the exhaust cylinder and effectively take away the heat. At the same time, the design that forms an angle with the central axis of the steam turbine can make the cooling water better cover the entire exhaust cylinder area during the spraying process, and improve the uniformity and efficiency of cooling. It enables the cooling water to contact the hot air flow more fully and take away the heat. Such a design helps to reduce the operating temperature of the low-pressure cylinder 3 and improve the overall performance and stability of the steam turbine.
[0029] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. An industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation, characterized in that: Including turbine flow; corresponding to the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder, the turbine flow includes high-pressure flow, medium-pressure flow and low-pressure flow; A seat cylinder valve is provided at a certain stage in the middle of the medium-pressure flow; the seat cylinder valve divides the turbine flow into an upstream section flow and a downstream section flow; the upstream section flow includes a high-pressure flow and an upstream medium-pressure flow on the upstream side of the seat cylinder valve; the downstream section flow includes a downstream medium-pressure flow and a low-pressure flow on the downstream side of the seat cylinder valve; the medium-pressure flow is provided with a cooling bypass, one end of the cooling bypass is connected to the end of the upstream medium-pressure flow, and the other end is connected to the starting end of the downstream medium-pressure flow; the cooling steam enters the downstream section flow through the cooling bypass; During cylinder cutting operation, the seat cylinder valve is used to cut off the steam flow between the upstream section flow and the downstream section flow, and the steam drawn out from the upstream section flow is sent to the industrial steam extraction user end through the steam extraction pipe at the seat cylinder valve.
2. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 1 is characterized in that: A three-way valve is provided on the steam extraction pipe at the seat cylinder valve; through the three-way valve, the steam extraction in the upstream section of the seat cylinder valve is sent to the industrial steam user end, one way is extracted to reduce temperature and pressure and remove oxygen from the deoxidizer, and one way is extracted to the small back pressure machine.
3. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 2 is characterized in that: The small back pressure machine is provided with a heat recovery steam extraction port, and the heat recovery steam extraction port is connected to the low-pressure heater; the extraction steam of the small back pressure machine directly heats the circulating water through the low-pressure heater.
4. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 1 is characterized in that: The exhaust port of the low-pressure cylinder is connected to the steam inlet of the condenser through a pipeline; the condenser also includes a water supply pipe connection port connected to the water supply pipe, a condensate connection port connected to the condensate pipeline of the low-pressure heater, and a condensate drain port connected to the first water inlet of the deaerator through a condenser drain pipeline.
5. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 3 is characterized in that: The low-pressure heater comprises a plurality of low-pressure heaters connected in series on the first thermal circulation water pipeline; condensed water formed after the low-pressure heater heats the first thermal circulation water pipeline is sent to the condensed water connection port through the low-pressure heater condensed water pipeline.
6. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 2 or 3, characterized in that: The deaerator is connected in series with a plurality of high-pressure heaters via a second thermal circulation water pipeline; The steam inlet of the high-pressure heater is connected to the steam extraction port of the high-pressure cylinder, and the condensed water formed after heating the circulating water in the second thermal circulating water pipeline is connected to the second water inlet of the deaerator through the condensed water drain port of the high-pressure heater and the condensed water pipeline of the high-pressure heater; One end of the second thermal circulating water pipeline is connected to the deaerator drain outlet, and the other end thereof is connected to the thermal system circulating water inlet of the boiler.
7. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 1 is characterized in that: A flow control valve is arranged on the cooling bypass.
8. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 1 is characterized in that: The intermediate pressure last stage blades and the low pressure last two stage blades of the intermediate pressure cylinder and the low pressure cylinder are additionally provided with thermocouple temperature monitoring devices for real-time monitoring of the blade blowing conditions.
9. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 8 is characterized in that: Cooling water nozzles are arranged near the blades of the last two low-pressure stages to reduce the working temperature of the rotor and the blades.
10. The industrial steam extraction system using a seat cylinder valve for cylinder cutting transformation according to claim 9, characterized in that: The cooling water nozzle is arranged on the exhaust guide ring of the low-pressure cylinder; the spraying direction of the cooling water nozzle points to the flow channel and forms an angle with the central axis of the steam turbine.