Peak regulation steam supply device of thermal power generating unit

Abstract

The invention provides a thermal power generating unit peak regulation steam supply device. According to the thermal power generating unit peak regulation steam supply device, a first main pipe is communicated with a main steam outlet and can be communicated with a first steam inlet, the first steam outlet is communicated with a steam backflow opening, the first end of a second main pipe can be communicated with a reheat steam outlet, and the second main pipe is communicated with a second steam inlet; the first auxiliary pipe can be communicated with or disconnected from the first main pipe, the first auxiliary pipe is communicated with the first air inlet, the first air outlet is communicated with the steam backflow port, the first end of the second auxiliary pipe can be communicated with or disconnected from the second main pipe, the second end of the second auxiliary pipe is communicated with the second air inlet, and the second air outlet is communicated with the third steam inlet. By means of the technical scheme, the problems that in the deep peak regulation or steam supply operation in the related technology, due to the difference of the steam extraction point position and the steam extraction amount, the steam flow of the high-pressure cylinder and the steam flow of the medium-pressure cylinder possibly have large difference, the axial thrust is unbalanced, and the service life of equipment is affected can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation units, and in particular to a peak load regulating steam supply device for a thermal power generation unit. Background Art

[0002] When thermal power units perform deep peak load regulation and flexible steam supply tasks, they need to extract steam from their steam cycles for heat storage or direct steam supply to adapt to rapid changes in grid load and meet industrial heat demand. This steam extraction operation usually extracts steam from the main steam or reheat steam pipeline, resulting in a reduction in the steam flow of the steam turbine. However, due to the differences in extraction points and extraction amounts, especially when steam is extracted from the upstream of the high-pressure cylinder and the intermediate-pressure cylinder respectively, this operation may cause significant differences in the steam flow of the high-pressure cylinder and the intermediate-pressure cylinder.

[0003] In the relevant technology, the axial thrust balance of the steam turbine is one of the key factors for its safe and stable operation. The axial thrust of the steam turbine is mainly determined by the steam flow and pressure distribution in each cylinder. Under normal operating conditions, the steam turbine ensures that the axial thrust is in a balanced state through precise steam flow control and reasonable cylinder design, thereby ensuring the stability of the axial position of the rotor. However, in deep peak regulation or steam supply operation, due to the difference in the position of the extraction point and the amount of steam extraction, there may be a large difference in the steam flow of the high-pressure cylinder and the intermediate-pressure cylinder. This difference will break the original axial thrust balance, increase the forward thrust of the high-pressure cylinder, and reduce the backward thrust of the intermediate-pressure cylinder, resulting in the axial position of the rotor being offset, making the axial thrust unbalanced, and increasing the load of the thrust bearing, thereby affecting the operating safety and equipment life of the steam turbine. Summary of the invention

[0004] The present invention provides a peak-shaving steam supply device for a thermal power unit to solve the problem in the related art that during deep peak-shaving or steam supply operation, due to the differences in steam extraction point positions and steam extraction amounts, the steam flow rates of the high-pressure cylinder and the medium-pressure cylinder may differ greatly, resulting in unbalanced axial thrust and affecting the life of the equipment.

[0005] The invention provides a peak-shaving steam supply device for a thermal power unit, which comprises: a furnace body, which has a main steam outlet, a steam return port and a reheat steam outlet; a generator set, which comprises a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder, a first main pipe and a second main pipe, wherein the high-pressure cylinder has a first steam inlet and a first steam outlet, a first end of the first main pipe is connected to the main steam outlet, a second end of the first main pipe can be connected to the first steam inlet, and the first steam outlet is connected to the steam return port, the intermediate-pressure cylinder has a second steam inlet and a second steam outlet, a first end of the second main pipe can be connected to the reheat steam outlet, a second end of the second main pipe is connected to the second steam inlet, the low-pressure cylinder has a third steam inlet and a third steam outlet, and the second steam outlet is connected to the The third steam inlet is connected, and the third steam outlet is connected to the outside; a heat storage component includes a first heat storage element, a second heat storage element, a first sub-pipe and a second sub-pipe, the first heat storage element has a first air inlet and a first air outlet, the first end of the first sub-pipe can be connected or disconnected with the first main pipe, the second end of the first sub-pipe is connected to the first air inlet to discharge part of the steam in the first main pipe into the first heat storage element, the first air outlet is connected to the steam reflux port, the second heat storage element has a second air inlet and a second air outlet, the first end of the second sub-pipe can be connected or disconnected with the second main pipe, the second end of the second sub-pipe is connected to the second air inlet to discharge part of the steam in the second main pipe into the second heat storage element, and the second air outlet is connected to the third steam inlet.

[0006] Furthermore, a first heat exchange pipeline and a second heat exchange pipeline are arranged in the first heat storage element, the first air inlet is arranged on the first end of the first heat exchange pipeline, and the first air outlet is arranged on the second end of the first heat exchange pipeline, the first heat storage element has a first water inlet and a third air outlet, the first water inlet is arranged on the first end of the second heat exchange pipeline, and the third air outlet is arranged on the second end of the second heat exchange pipeline, and the peak-shaving steam supply device of the thermal power unit also includes a steam main pipe connected to external equipment, and the third air outlet is connected to the steam main pipe.

[0007] Furthermore, the peak-shaving steam supply device of the thermal power unit also includes a reflux main pipe and a reflux sub-pipe, the first end of the reflux main pipe is connected to the first air outlet, the second end of the reflux main pipe is connected to the steam reflux port, the first end of the reflux sub-pipe is connected to the reflux main pipe, and the second end of the reflux sub-pipe is connected to the steam main pipe.

[0008] Furthermore, the peak-shaving steam supply device for the thermal power unit also includes a first pressure reducing valve, which is arranged on the reflux main pipe.

[0009] Furthermore, the peak-shaving steam supply device for the thermal power unit also includes a first on-off valve, and the first on-off valve is arranged on the first main pipe.

[0010] Furthermore, a third heat exchange pipeline and a fourth heat exchange pipeline are arranged in the second heat storage element, the second air inlet is arranged on the first end of the third heat exchange pipeline, the second air outlet is arranged on the second end of the third heat exchange pipeline, the second heat storage element has a second water inlet and a fourth air outlet, the second water inlet is arranged on the first end of the fourth heat exchange pipeline, the fourth air outlet is arranged on the second end of the fourth heat exchange pipeline, and the fourth air outlet is connected to the steam main pipe.

[0011] Furthermore, the peak-shaving steam supply device of the thermal power unit also includes a first pipeline and a second pipeline, the first end of the first pipeline is connected to the second steam outlet, the second end of the first pipeline is connected to the third steam inlet, the first end of the second pipeline is connected to the second outlet, and the second end of the second pipeline is connected to the first pipeline.

[0012] Furthermore, the peak-shaving steam supply device for the thermal power unit also includes a second pressure reducing valve, which is arranged on the second pipeline.

[0013] Furthermore, the peak-shaving steam supply device for the thermal power unit also includes a second on-off valve, and the second on-off valve is arranged on the second main pipe.

[0014] Furthermore, a deaerator is provided at both the first water inlet and the second water inlet.

[0015] The peak-shaving steam supply device for a thermal power unit provided in this embodiment is applied. The peak-shaving steam supply device for a thermal power unit includes a furnace body, a generator set, and a heat storage component. By arranging the heat storage component upstream of the high-pressure cylinder and the intermediate-pressure cylinder, the heat of part of the steam can be stored during the peak-shaving period. At the same time, by adjusting the opening and closing of the first auxiliary pipe and the second auxiliary pipe, the steam flow of the high-pressure cylinder and the intermediate-pressure cylinder is balanced to avoid the imbalance of the axial thrust of the steam turbine and ensure the safe and stable operation of the steam turbine. The implementation effect is that in deep peak-shaving or peak steam supply operation, the steam flow of the high-pressure cylinder and the intermediate-pressure cylinder can be effectively controlled to maintain the axial thrust balance, and the heat storage component is used to store and reuse the heat energy in the steam to improve the energy utilization efficiency. The use process is that during the peak-shaving period, the main part of the high-temperature steam generated by the furnace body enters the high-pressure cylinder through the first main pipe, and a small part of the high-pressure steam enters the first heat storage element through the first auxiliary pipe. The high-temperature steam can drive the high-pressure cylinder to work, and the gas discharged from the high-pressure cylinder is discharged into the furnace body through the steam reflux port. A part of the high-temperature steam is heat-exchanged in the first heat storage element, so that part of the heat of the high-temperature steam is stored in the first heat storage element, and a part of the steam that is cooled and does not undergo phase change is discharged to the furnace body through the steam reflux port for reheating, and the other part of the steam that is cooled and does not undergo phase change is directly discharged, and most of the reheated steam is discharged into the medium-pressure cylinder through the second main pipe, and a small part of the reheated steam is discharged into the second heat storage element through the second auxiliary pipe, and part of the heat of a small part of the reheated steam is stored, and most of the reheated steam enters and is discharged to the low-pressure cylinder through the medium-pressure cylinder, and a small part of the reheated steam is cooled through the second heat storage element without phase change and is also discharged into the low-pressure cylinder. During the peak period, the load needs to be reduced, so the content of high-temperature steam needs to be reduced, part of the high-temperature steam needs to be extracted and the heat of the extracted part of the steam needs to be stored, so as to meet the high load and exhaust requirements during the peak period, and part of the steam is discharged into the first heat storage component and the second heat storage component through the first auxiliary pipe and the second auxiliary pipe for heat storage. During the peak period, the high-temperature steam generated by the furnace body enters the high-pressure cylinder through the first main pipe, and does not need to enter the first heat storage component through the first auxiliary pipe. The high-temperature steam can drive the high-pressure cylinder to work, and the gas discharged from the high-pressure cylinder is discharged into the furnace body through the steam reflux port, and the reheated steam is discharged into the medium-pressure cylinder through the second main pipe. The reheated steam enters and is discharged to the low-pressure cylinder through the medium-pressure cylinder. During the peak period, the load is large, so there is no need to extract high-temperature steam. It is only necessary to close the first auxiliary pipe and the second auxiliary pipe to stop the steam extraction. At the same time, the heat stored in the heat storage component is used to generate high-temperature steam to meet the high load requirements without reducing the content of high-temperature steam, so as to meet the high load and exhaust requirements during the peak period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1A schematic diagram of a peak-shaving steam supply device for a thermal power unit provided according to an embodiment of the present invention is shown.

[0018] The above drawings include the following reference numerals:

[0019] 10. Furnace body; 11. Main steam outlet; 12. Steam return port; 13. Reheat steam outlet;

[0020] 20. Generator set; 21. High-pressure cylinder; 211. First steam inlet; 212. First steam outlet; 22. Medium-pressure cylinder; 221. Second steam inlet; 222. Second steam outlet; 23. Low-pressure cylinder; 231. Third steam inlet; 24. First main pipe; 25. Second main pipe;

[0021] 30. heat storage component; 31. first heat storage element; 311. first air inlet; 312. first air outlet; 313. first water inlet; 314. third air outlet; 32. second heat storage element; 321. second air inlet; 322. second air outlet; 323. second water inlet; 324. fourth air outlet; 33. first auxiliary pipe; 34. second auxiliary pipe;

[0022] 41. Steam main pipe; 42. Return main pipe; 43. Return auxiliary pipe; 44. First pipeline; 45. Second pipeline. DETAILED DESCRIPTION

[0023] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0024] like Figure 1As shown, an embodiment of the present invention provides a peak-shaving steam supply device for a thermal power unit, which includes a furnace body 10, a generator set 20 and a heat storage component 30. The furnace body 10 has a main steam outlet 11, a steam return port 12 and a reheat steam outlet 13. The generator set 20 includes a high-pressure cylinder 21, an intermediate-pressure cylinder 22, a low-pressure cylinder 23, a first main pipe 24 and a second main pipe 25. The high-pressure cylinder 21 has a first steam inlet 211 and a first steam outlet 212. The first end of the first main pipe 24 is connected to the main steam outlet 11, and the second end of the first main pipe 24 can be connected to the first steam inlet 211, and the first steam outlet 212 is connected to the steam return port 12. The intermediate-pressure cylinder 22 has a second steam inlet 221 and a second steam outlet 222. The first end of the second main pipe 25 can be connected to the reheat steam outlet 13, and the second end of the second main pipe 25 is connected to the second steam inlet 221. The low-pressure cylinder 23 has a third steam inlet 231 and a third steam outlet 232. The second steam outlet 222 is connected to the third steam inlet 231, and the third steam outlet is connected to the outside. The heat storage assembly 30 includes a first heat storage member 31, a second heat storage member 32, a first sub-pipe 33 and a second sub-pipe 34. The first heat storage member 31 has a first air inlet 311 and a first air outlet 312. The first end of the first sub-pipe 33 can be connected or disconnected with the first main pipe 24. The second end of the first sub-pipe 33 is connected to the first air inlet 311 to connect the first main pipe 24 to the first main pipe 24. 4 is discharged into the first heat storage member 31, the first air outlet 312 is communicated with the steam reflux port 12, the second heat storage member 32 has a second air inlet 321 and a second air outlet 322, the first end of the second sub-pipe 34 is connectable with or disconnectable from the second main pipe 25, the second end of the second sub-pipe 34 is communicated with the second air inlet 321 to discharge part of the steam in the second main pipe 25 into the second heat storage member 32, and the second air outlet 322 is communicated with the third steam inlet 231.

[0025] The peak-shaving steam supply device for a thermal power unit provided in this embodiment is applied. The peak-shaving steam supply device for a thermal power unit includes a furnace body 10, a generator set 20, and a heat storage component 30. By arranging the heat storage component 30 upstream of the high-pressure cylinder 21 and the intermediate-pressure cylinder 22, the heat of part of the steam can be stored during the peak-shaving period. At the same time, by adjusting the opening and closing of the first auxiliary pipe 33 and the second auxiliary pipe 34, the steam flow of the high-pressure cylinder 21 and the intermediate-pressure cylinder 22 is balanced to avoid the imbalance of the axial thrust of the steam turbine and ensure the safe and stable operation of the steam turbine. The implementation effect is that in deep peak-shaving or peak steam supply operation, the steam flow of the high-pressure cylinder 21 and the intermediate-pressure cylinder 22 can be effectively controlled to maintain the axial thrust balance, and the heat storage component 30 is used to store and reuse the heat energy in the steam to improve the energy utilization efficiency. The use process is that during the peak load period, the main part of the high-temperature steam generated by the furnace body 10 enters the high-pressure cylinder 21 through the first main pipe 24, and a small part of the high-pressure steam enters the first heat storage element 31 through the first auxiliary pipe 33. The high-temperature steam can drive the high-pressure cylinder 21 to work, and the gas discharged from the high-pressure cylinder 21 is discharged into the furnace body 10 through the steam return port 12. A part of the high-temperature steam is heat-exchanged in the first heat storage element 31, so that part of the heat of the high-temperature steam is stored in the first heat storage element 31, and a part of the steam that is cooled and does not undergo phase change is discharged to the furnace body 10 through the steam return port 12 for reheating, and the other part of the steam that is cooled and does not undergo phase change is directly discharged, and most of the reheated steam is discharged into the intermediate-pressure cylinder 22 through the second main pipe 25, and a small part of the reheated steam is discharged into the second heat storage element 32 through the second auxiliary pipe 34, and part of the heat of a small part of the reheated steam is stored, and most of the reheated steam enters and is discharged to the low-pressure cylinder 23 through the intermediate-pressure cylinder 22, and a small part of the reheated steam is cooled through the second heat storage element 32 without phase change and is also discharged into the low-pressure cylinder 23. During the peak load period, the load needs to be reduced, so the content of high-temperature steam needs to be reduced, part of the high-temperature steam is extracted and the heat of the extracted part of the steam is stored, so as to meet the high load and exhaust requirements during the peak period, and part of the steam is discharged into the first heat storage member 31 and the second heat storage member 32 through the first auxiliary pipe 33 and the second auxiliary pipe 34 for heat storage. During the peak period, the high-temperature steam generated by the furnace body 10 enters the high-pressure cylinder 21 through the first main pipe 24, and does not need to enter the first heat storage member 31 through the first auxiliary pipe 33. The high-temperature steam can drive the high-pressure cylinder 21 to work, and the gas discharged from the high-pressure cylinder 21 is discharged into the furnace body 10 through the steam reflux port 12, and the reheated steam is discharged into the medium-pressure cylinder 22 through the second main pipe 25. The reheated steam enters and is discharged to the low-pressure cylinder 23 through the medium-pressure cylinder 22. During peak hours, the load required is relatively large, so there is no need to extract high-temperature steam. All you need to do is close the first sub-pipe 33 and the second sub-pipe 34 to stop extracting steam. At the same time, use the heat stored in the heat storage component 30 to generate high-temperature steam. There is no need to reduce the content of high-temperature steam to meet high-load demands, which makes it easier to meet high-load and exhaust needs during peak hours.

[0026] like Figure 1As shown, the first heat storage element 31 is provided with a first heat exchange pipeline and a second heat exchange pipeline, the first air inlet 311 is provided at the first end of the first heat exchange pipeline, the first air outlet 312 is provided at the second end of the first heat exchange pipeline, the first heat storage element 31 has a first water inlet 313 and a third air outlet 314, the first water inlet 313 is provided at the first end of the second heat exchange pipeline, the third air outlet 314 is provided at the second end of the second heat exchange pipeline, the peak load-shaving steam supply device of the thermal power unit further includes a steam main pipe 41 connected to an external device, and the third air outlet 314 is connected to the steam main pipe 41. With the above structure, heat exchange between steam and water is realized through the first heat exchange pipeline and the second heat exchange pipeline, and the heat energy in the steam is stored in the first heat storage element 31, and at the same time, the steam generated by heat exchange is discharged into the steam main pipe 41 through the third air outlet 314 for use by external devices. The implementation effect is that the heat energy in steam can be efficiently stored and reused, energy waste can be reduced, and a stable heat source can be provided for external equipment through the steam main pipe 41. The application scenario is mainly when the thermal power unit needs to perform deep peak regulation or steam supply operation, especially when the industrial heat demand is large or the grid load is low, the heat energy can be stored through the heat storage component 30 and released during the peak load period to meet the heat demand of external equipment.

[0027] like Figure 1 As shown, the peak-shaving steam supply device of the thermal power unit also includes a return main pipe 42 and a return sub-pipe 43. The first end of the return main pipe 42 is connected to the first gas outlet 312, the second end of the return main pipe 42 is connected to the steam return port 12, the first end of the return sub-pipe 43 is connected to the return main pipe 42, and the second end of the return sub-pipe 43 is connected to the steam main pipe 41. With the above structure, the steam that has undergone heat exchange in the first heat storage element 31 is refluxed to the furnace body 10 through the steam return port 12 for reheating through the return main pipe 42 and the return sub-pipe 43, and part of the steam that has undergone heat exchange is directly discharged into the steam main pipe 41 through the return sub-pipe 43 for use by external equipment. The implementation effect is that the flow direction of steam can be flexibly controlled, and both reheating cycle and direct steam supply can be performed, thereby improving the flexibility and energy utilization efficiency of the system. The application scenario is mainly in the peak-shaving operation of thermal power units, especially in the case where it is necessary to balance the steam flow of the high-pressure cylinder 21 and the medium-pressure cylinder 22, and use the steam main pipe 41 to supply steam to external equipment. The use process is that during the peak-shaving period, part of the steam is refluxed to the furnace body 10 through the reflux main pipe 42 for reheating, and the other part of the steam is discharged into the steam main pipe 41 through the reflux sub-pipe 43. During the peak period, the steam generated by the heat exchange in the first heat storage element 31 by the water entering mainly through the first water inlet 313 is discharged into the steam main pipe 41 to realize steam supply. At this time, the reflux main pipe 42 and the reflux sub-pipe 43 will not discharge steam.

[0028] In the present embodiment, the peak-shaving steam supply device of the thermal power unit further includes a first pressure reducing valve, which is arranged on the reflux main pipe 42. With the above structure, the pressure of the steam returning to the furnace body 10 is adjusted through the first pressure reducing valve to ensure that the steam can be effectively reheated in the furnace body 10, while avoiding damage to the furnace body 10 and the reflux main pipe 42 caused by excessive steam pressure. The implementation effect is manifested in that the steam pressure can be accurately controlled to ensure the efficiency and safety of the reheating process. The application scenario is mainly in the peak-shaving operation of the thermal power unit, especially in situations where the steam pressure needs to be adjusted to meet the reheating demand of the furnace body 10. The use process is to adjust the pressure of the reflux steam through the first pressure reducing valve according to the reheating demand of the furnace body 10 during the peak-shaving period to ensure that the steam can be effectively reheated while avoiding unnecessary pressure burden on the system.

[0029] In this embodiment, the peak-shaving steam supply device of the thermal power unit also includes a first opening and closing valve, which is arranged on the first main pipe 24. With the above structure, the flow of the main steam from the main steam outlet 11 of the furnace body 10 into the high-pressure cylinder 21 is controlled by the first opening and closing valve, so as to achieve precise control of the steam flow of the steam turbine, thereby balancing the steam flow of the high-pressure cylinder 21 and the medium-pressure cylinder 22, and avoiding axial thrust imbalance. The implementation effect is that the steam flow can be flexibly adjusted according to the peak-shaving demand to ensure the safe and stable operation of the steam turbine. The application scenario is mainly when the thermal power unit performs deep peak-shaving or steam supply tasks, especially in occasions where it is necessary to respond quickly to changes in the load of the power grid. The use process is to adjust the flow of the main steam through the first opening and closing valve according to the steam flow requirements of the high-pressure cylinder 21 and the medium-pressure cylinder 22 during the peak period, and adjust the first opening and closing valve to close according to the high load requirements during the peak period, and the steam generated by the heat exchange of the water entering the first water inlet 313 in the first heat storage element 31 is discharged into the steam main pipe 41 to realize steam supply, ensuring that the steam flow meets the power generation demand.

[0030] In this embodiment, the second heat storage element 32 is provided with a third heat exchange pipeline and a fourth heat exchange pipeline, the second air inlet 321 is provided on the first end of the third heat exchange pipeline, the second air outlet 322 is provided on the second end of the third heat exchange pipeline, the second heat storage element 32 has a second water inlet 323 and a fourth air outlet 324, the second water inlet 323 is provided on the first end of the fourth heat exchange pipeline, the fourth air outlet 324 is provided on the second end of the fourth heat exchange pipeline, and the fourth air outlet 324 is connected to the steam main pipe 41. With the above structure, heat exchange between steam and water is realized through the third heat exchange pipeline and the fourth heat exchange pipeline, and the heat energy in the steam is stored in the second heat storage element 32, and the steam that has undergone heat exchange is discharged into the steam main pipe 41 through the fourth air outlet 324 for use by external equipment. The implementation effect is that the heat energy in the steam can be efficiently stored and reused, energy waste is reduced, and a stable heat source is provided for external equipment through the steam main pipe 41. The application scenario is mainly when the thermal power unit needs to perform deep peak regulation or steam supply operation, especially when the industrial heat demand is large or the grid load is low. The heat energy can be stored through the heat storage component 30 and released during the peak load period to meet the heat demand of external equipment.

[0031] like Figure 1 As shown, the peak-shaving steam supply device of the thermal power unit also includes a first pipeline 44 and a second pipeline 45, the first end of the first pipeline 44 is connected to the second steam outlet 222, the second end of the first pipeline 44 is connected to the third steam inlet 231, the first end of the second pipeline 45 is connected to the second gas outlet 322, and the second end of the second pipeline 45 is connected to the first pipeline 44. With the above structure, the steam of the intermediate pressure cylinder 22 is directly or indirectly introduced into the low pressure cylinder 23 through the first pipeline 44 and the second pipeline 45, ensuring the continuity of the steam flow and the stable operation of the steam turbine. The implementation effect is that it can effectively balance the steam flow of the intermediate pressure cylinder 22 and the low pressure cylinder 23, avoid the imbalance of the axial thrust of the steam turbine, and at the same time improve the flexibility and efficiency of the steam cycle through the pipeline connection. The application scenario is mainly when the thermal power unit performs deep peak-shaving and steam supply tasks, especially when it is necessary to accurately control the steam flow of the steam turbine and maintain the balance of the axial thrust. The use process is to adjust the steam flow of the intermediate pressure cylinder 22 and the low pressure cylinder 23 through the first pipeline 44 and the second pipeline 45 during the peak period, and adjust the steam flow in the pipeline according to the high load demand during the peak period to ensure the stable operation of the turbine.

[0032] In this embodiment, the peak-shaving steam supply device of the thermal power unit also includes a second pressure reducing valve, which is arranged on the second pipeline 45. With the above structure, the steam pressure discharged from the second heat storage element 32 into the second pipeline 45 is adjusted through the second pressure reducing valve to ensure that the pressure of the steam before entering the low-pressure cylinder 23 is moderate, thereby avoiding damage to the steam turbine caused by excessive steam pressure. The implementation effect is manifested in the ability to accurately control the steam pressure and ensure the efficiency and safety of the steam cycle. The application scenario is mainly in the peak-shaving operation of the thermal power unit, especially in situations where the steam pressure needs to be adjusted to meet the operating requirements of the low-pressure cylinder 23. The use process is to adjust the steam pressure through the second pressure reducing valve during the peak-shaving period according to the operating requirements of the low-pressure cylinder 23 to ensure that the steam can effectively drive the low-pressure cylinder 23 while avoiding unnecessary pressure burden on the system.

[0033] In this embodiment, the peak-shaving steam supply device of the thermal power unit also includes a second opening and closing valve, which is arranged on the second main pipe 25. With the above structure, the second opening and closing valve controls the flow of reheated steam from the furnace body 10 into the intermediate pressure cylinder 22, realizes precise control of the steam flow of the steam turbine, thereby balancing the steam flow of the intermediate pressure cylinder 22 and the low pressure cylinder 23, and avoiding axial thrust imbalance. The implementation effect is that the steam flow can be flexibly adjusted according to the peak-shaving demand to ensure the safe and stable operation of the steam turbine. The application scenario is mainly when the thermal power unit performs deep peak-shaving or steam supply tasks, especially in occasions where it is necessary to respond quickly to changes in the grid load. The use process is to adjust the flow of reheated steam through the second opening and closing valve according to the steam flow requirements of the intermediate pressure cylinder 22 and the low pressure cylinder 23 during the peak period, and adjust the opening of the second opening and closing valve according to the high load demand during the peak period to ensure that the steam flow meets the power generation demand.

[0034] In this embodiment, a deaerator is provided at both the first water inlet 313 and the second water inlet 323. With the above structure, oxygen in the feed water entering the heat storage component 30 is removed by the deaerator to prevent oxygen from corroding the equipment under high temperature conditions and extend the life of the equipment. The implementation effect is that the oxygen in the feed water can be effectively removed, and the operating stability and equipment life of the heat storage component 30 are improved. The application scenario is mainly in the peak-shaving operation of thermal power units, especially in situations where long-term operation and frequent steam extraction are required. The use process is that during the peak-shaving period, the oxygen in the feed water is removed by the deaerator, and then the feed water is sent to the first heat storage component 31 and the second heat storage component 32 for heat exchange to store the thermal energy in the steam. During the peak period, the feed water treated by the deaerator is heat exchanged in the heat storage component 30 to generate high-temperature steam for use by external equipment, ensuring the quality of the steam and the anti-corrosion performance of the equipment.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0039] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A peak-shaving steam supply device for a thermal power unit, characterized in that: The peak load regulation steam supply device of the thermal power unit comprises: A furnace body (10) having a main steam outlet (11), a steam return port (12) and a reheat steam outlet (13); A generator set (20) comprises a high-pressure cylinder (21), an intermediate-pressure cylinder (22), a low-pressure cylinder (23), a first main pipe (24) and a second main pipe (25), wherein the high-pressure cylinder (21) has a first steam inlet (211) and a first steam outlet (212), a first end of the first main pipe (24) is connected to the main steam outlet (11), a second end of the first main pipe (24) can be connected to the first steam inlet (211), and the first steam outlet (212) is connected to the steam return port (12). The intermediate pressure cylinder (22) is connected to the reheat steam outlet (13), the intermediate pressure cylinder (22) having a second steam inlet (221) and a second steam outlet (222), the first end of the second main pipe (25) can be connected to the reheat steam outlet (13), the second end of the second main pipe (25) is connected to the second steam inlet (221), the low pressure cylinder (23) has a third steam inlet (231) and a third steam outlet, the second steam outlet (222) is connected to the third steam inlet (231), and the third steam outlet is connected to the outside; A heat storage component (30) comprises a first heat storage component (31), a second heat storage component (32), a first auxiliary pipe (33) and a second auxiliary pipe (34), wherein the first heat storage component (31) has a first air inlet (311) and a first air outlet (312), a first end of the first auxiliary pipe (33) can be connected to or disconnected from the first main pipe (24), a second end of the first auxiliary pipe (33) is connected to the first air inlet (311) to discharge part of the steam in the first main pipe (24) into the first heat storage component (31), and the first auxiliary pipe (33) is connected to the first air inlet (311) to discharge part of the steam in the first main pipe (24) into the first heat storage component (31), The air outlet (312) is connected to the steam return port (12); the second heat storage element (32) has a second air inlet (321) and a second air outlet (322); the first end of the second sub-pipe (34) can be connected to or disconnected from the second main pipe (25); the second end of the second sub-pipe (34) is connected to the second air inlet (321) to discharge part of the steam in the second main pipe (25) into the second heat storage element (32); and the second air outlet (322) is connected to the third steam inlet (231).

2. The peak load-shaving steam supply device for thermal power generation units according to claim 1, characterized in that: A first heat exchange pipeline and a second heat exchange pipeline are arranged in the first heat storage element (31); the first air inlet (311) is arranged on the first end of the first heat exchange pipeline; the first air outlet (312) is arranged on the second end of the first heat exchange pipeline; the first heat storage element (31) has a first water inlet (313) and a third air outlet (314); the first water inlet (313) is arranged on the first end of the second heat exchange pipeline; the third air outlet (314) is arranged on the second end of the second heat exchange pipeline; the peak-shaving steam supply device of the thermal power unit further comprises a steam main pipe (41) connected to an external device; the third air outlet (314) is connected to the steam main pipe (41).

3. The peak load-shaving steam supply device for thermal power generation units according to claim 2, characterized in that: The peak-shaving steam supply device for the thermal power unit further comprises a return main pipe (42) and a return sub-pipe (43); the first end of the return main pipe (42) is connected to the first gas outlet (312); the second end of the return main pipe (42) is connected to the steam return port (12); the first end of the return sub-pipe (43) is connected to the return main pipe (42); and the second end of the return sub-pipe (43) is connected to the steam main pipe (41).

4. The peak load-shaving steam supply device for thermal power generation units according to claim 3, characterized in that: The peak-shaving steam supply device for the thermal power unit further comprises a first pressure reducing valve, which is arranged on the reflux main pipe (42).

5. The peak load-shaving steam supply device for thermal power generation units according to claim 1, characterized in that: The peak load regulation steam supply device for the thermal power unit further comprises a first on-off valve, which is arranged on the first main pipe (24).

6. The peak load-shaving steam supply device for thermal power generation units according to claim 2, characterized in that: A third heat exchange pipeline and a fourth heat exchange pipeline are arranged in the second heat storage element (32); the second air inlet (321) is arranged on the first end of the third heat exchange pipeline; the second air outlet (322) is arranged on the second end of the third heat exchange pipeline; the second heat storage element (32) has a second water inlet (323) and a fourth air outlet (324); the second water inlet (323) is arranged on the first end of the fourth heat exchange pipeline; the fourth air outlet (324) is arranged on the second end of the fourth heat exchange pipeline; and the fourth air outlet (324) is connected to the steam main pipe (41).

7. The peak load-shaving steam supply device for thermal power generation units according to claim 6, characterized in that: The peak-shaving steam supply device for the thermal power unit further comprises a first pipeline (44) and a second pipeline (45); the first end of the first pipeline (44) is connected to the second steam outlet (222); the second end of the first pipeline (44) is connected to the third steam inlet (231); the first end of the second pipeline (45) is connected to the second gas outlet (322); and the second end of the second pipeline (45) is connected to the first pipeline (44).

8. The peak load-shaving steam supply device for thermal power generation units according to claim 7, characterized in that: The peak-shaving steam supply device for a thermal power unit further comprises a second pressure reducing valve, and the second pressure reducing valve is arranged on the second pipeline (45).

9. The peak load-shaving steam supply device for thermal power generation units according to claim 6, characterized in that: The peak load regulation steam supply device for the thermal power unit further comprises a second on-off valve, and the second on-off valve is arranged on the second main pipe (25).

10. The peak load-shaving steam supply device for thermal power generation units according to claim 6, characterized in that: Deaerators are provided at both the first water inlet (313) and the second water inlet (323).

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