Power plant boiler heat storage system based on fluidized solid high-temperature medium

Abstract

The utility model discloses a power plant boiler heat storage system based on a fluidized solid high-temperature medium. The power plant boiler heat storage system based on the fluidized solid high-temperature medium comprises a boiler, a heat storage device and a heat storage device, a steam turbine; and a high-temperature steam outlet of the boiler communicates with the steam turbine and an inlet of the heat storage circulating system, and the heat storage circulating system is used for heat recovery. According to the power plant boiler heat storage system based on the fluidized solid high-temperature medium, the boiler can meet the daily peak regulation requirement of a power plant under the non-stop state, the situation that the generating capacity is not matched with the electricity consumption is effectively reduced, meanwhile, adjustment is conducted in time according to the electricity consumption peak value, and the energy consumption is reduced. Therefore, resource consumption caused by long start-stop time and low response speed of the boiler is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverized coal combustion, and in particular to a power plant boiler heat storage system based on fluidized solid high-temperature medium. Background Art

[0002] As the installed capacity of new energy generators increases year by year, there are higher requirements for the peak load regulation capacity of thermal power plants. However, in the existing technology, boilers usually cannot make timely adjustments according to the peak power consumption, which greatly causes resource consumption and easily leads to a mismatch between power generation and power consumption. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a power plant boiler heat storage system based on fluidized solid high-temperature medium, which can meet the daily peak-shaving demand of the power plant without stopping the machine, and effectively reduce the mismatch between power generation and power consumption.

[0004] According to an embodiment of the utility model, a power plant boiler heat storage system based on fluidized solid high-temperature medium includes: a boiler; a steam turbine; a heat storage circulation system, wherein the high-temperature steam outlet of the boiler is respectively connected to the inlet of the steam turbine and the heat storage circulation system, and the heat storage circulation system is used for heat recovery.

[0005] According to the power plant boiler heat storage system based on fluidized solid high-temperature medium in the embodiment of the utility model, the high-temperature steam outlet of the boiler is connected to the inlet of the turbine and the heat storage circulation system respectively, and the heat storage circulation system is used for heat recovery, so that the boiler can meet the daily peak-shaving demand of the power plant without stopping, effectively reducing the mismatch between power generation and power consumption, and at the same time, timely adjustment according to the peak power consumption is achieved, thereby avoiding resource consumption due to long start and stop time and slow response speed of the boiler.

[0006] Some embodiments of the present invention further include: a flow regulating component, wherein the flow regulating component is used to regulate the flow of the high-temperature steam of the boiler to the steam turbine and the heat storage cycle system.

[0007] In some embodiments of the utility model, the high-temperature steam outlet of the boiler is connected to the steam turbine through a first pipeline, and the high-temperature steam outlet of the boiler is connected to the heat storage circulation system through a second pipeline, and the flow regulating component includes: a first valve, which is arranged on the first pipeline; a second valve, which is arranged on the second pipeline.

[0008] In some embodiments of the present invention, the flow regulating component further includes: a first gas flow meter, which is disposed on the first pipeline; and a second gas flow meter, which is disposed on the first pipeline.

[0009] In some embodiments of the utility model, the heat storage circulation system includes: a steam heat exchanger, in which a first heat exchange pipe is provided, and the high-temperature steam outlet of the boiler is connected to the inlet of the first heat exchange pipe; a water heat exchanger, in which a second heat exchange pipe is provided, one end of the second heat exchange pipe is formed as a cold water inlet and the other end is formed as a hot water outlet; a fluidized solid medium, the fluidized solid medium is suitable for circulating between the steam heat exchanger and the water heat exchanger and exchanging heat with the first heat exchange pipe and the second heat exchange pipe respectively.

[0010] In some embodiments of the utility model, the heat storage circulation system also includes: a high-temperature fluidized solid medium storage tank, which is suitable for accommodating the fluidized solid medium after heat exchange with the first heat exchange pipe, and the fluidized solid medium is suitable for circulating in sequence between the steam heat exchanger, the high-temperature fluidized solid medium storage tank and the water heat exchanger.

[0011] In some embodiments of the present invention, the heat storage circulation system also includes: a flow controller, the inlet of the flow controller is connected to the outlet of the high-temperature fluidized solid medium storage tank, the outlet of the flow controller is connected to the water heat exchanger, and the flow controller controls the flow rate of the fluidized solid medium flowing to the water heat exchanger.

[0012] In some embodiments of the utility model, the bottom wall of the steam heat exchanger is provided with a first flow hood having a first air vent, and the heat storage circulation system further includes: a first fan, which is connected to the steam heat exchanger through the first air vent.

[0013] In some embodiments of the present invention, the heat storage cycle system further includes: a gas-solid separator, the fluidized solid medium is suitable for circulating in sequence between the steam heat exchanger, the gas-solid separator and the water heat exchanger, and the gas-solid separator is used to discharge gas.

[0014] In some embodiments of the utility model, the bottom wall of the water heat exchanger is provided with a second flow hood having a second air vent, and the heat storage circulation system further includes: a second fan, which is connected to the water heat exchanger through the second air vent.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a schematic diagram of a power plant boiler heat storage system based on fluidized solid high-temperature medium according to an embodiment of the utility model.

[0018] Reference numerals:

[0019] 100. Power plant boiler heat storage system based on fluidized solid high-temperature medium;

[0020] 1. Boiler; 11. Boiler body; 12. Superheater;

[0021] 2. Steam turbine;

[0022] 3. Heat storage circulation system; 31. Steam heat exchanger; 311. First heat exchange pipeline; 312. First flow hood; 33. Gas-solid separator; 34. High-temperature fluidized solid medium storage tank; 35. Flow controller; 36. Water heat exchanger; 361. Second heat exchange pipeline; 3611. Cold water inlet; 3612. Hot water outlet; 362. Second flow hood; 37. First fan; 38. Second fan; 39. Dust collector;

[0023] 4. flow regulating assembly; 41. first valve; 42. second valve; 43. first gas flow meter; 44. second gas flow meter;

[0024] 5. The first pipeline;

[0025] 6. Second pipeline;

[0026] 7. The third pipeline; 71. The third valve;

[0027] 8. Fourth pipeline; 81. Fourth valve. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following describes a power plant boiler heat storage system 100 based on fluidized solid high-temperature medium according to an embodiment of the present utility model with reference to the accompanying drawings.

[0032] like Figure 1 As shown, a power plant boiler heat storage system 100 based on fluidized solid high-temperature medium according to an embodiment of the utility model comprises a boiler 1, a steam turbine 2 and a heat storage circulation system 3. The high-temperature steam outlet of the boiler 1 is connected to the inlet of the steam turbine 2 and the heat storage circulation system 3 respectively, and the heat storage circulation system 3 is used for heat recovery.

[0033] It can be understood that the boiler 1 has a chamber, which is suitable for burning coal powder to heat water and generate water vapor. The high-temperature steam outlet of the boiler 1 is connected to the inlet of the steam turbine 2 and the heat storage circulation system 3 respectively, so that the water vapor flows to the steam turbine 2 and the heat storage circulation system 3 respectively, and the thermal energy of the water vapor is converted into mechanical energy by the steam turbine 2, and the generator coaxially connected to the steam turbine 2 is driven to convert the mechanical energy into electrical energy, thereby realizing the thermal power generation process. At the same time, heat recovery is realized by the water vapor flowing to the heat storage circulation system 3.

[0034] During peak electricity consumption, the water vapor flow from boiler 1 to steam turbine 2 is increased, and the water vapor flow from boiler 1 to heat storage circulation system 3 is reduced to meet the electricity demand during peak electricity consumption; when the peak electricity consumption is low, the water vapor flow from boiler 1 to steam turbine 2 is reduced, and the water vapor flow from boiler 1 to heat storage circulation system 3 is increased to meet the electricity demand during low peak electricity consumption; at the same time, during low electricity consumption, the water vapor generated by boiler 1 only flows to the water vapor flow of heat storage circulation system 3.

[0035] Therefore, by controlling the flow rate of water vapor flowing from the boiler 1 through the high-temperature steam outlet to the turbine 2 and the heat storage circulation system 3 respectively, the boiler 1 can meet the daily peak-shaving demand of the power plant without stopping, effectively reducing the mismatch between power generation and power consumption. At the same time, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium of the present application can make timely adjustments according to the peak power consumption, thereby avoiding resource consumption due to long start and stop time and slow response speed of the boiler 1.

[0036] In addition, the energy recovered by the heat storage circulation system 3 can be used in a variety of scenarios according to demand. For example, the heat storage circulation system 3 uses the energy recovered by the heat to heat water. During the peak period of electricity consumption, the hot water is sent to the boiler 1 again to increase the feed water temperature of the boiler 1, thereby increasing the steam-water circulation volume of the boiler 1, further solving the problem that the boiler 1 cannot meet the power supply demand in time due to the slow start and stop speed and wastes a large amount of coal resources, or using the hot water for daily use and other application scenarios according to actual needs.

[0037] Furthermore, the boiler 1 includes a boiler body 11 and a superheater 12. The boiler body 11 has a chamber, in which pulverized coal is burned to heat water to generate steam. The superheater 12 is placed in the tail flue of the boiler body 11 to heat the steam to high-temperature steam. The superheater 12 has a high-temperature steam outlet. Thus, the steam flowing out of the boiler body 11 is further heated by the superheater 12 to reach a higher temperature and become high-temperature steam, thereby improving the work efficiency of the steam, optimizing the operating environment of the steam turbine 2 and the heat storage cycle system 3, and further improving the reliability of the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium of the present application.

[0038] In some embodiments, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium also includes a first cooling tower, and the inlet of the first cooling tower is connected to the steam outlet of the steam turbine 2. Thus, the water vapor that has completed work in the steam turbine 2 flows from the steam outlet to the first cooling tower, and the water vapor is cooled by the first cooling tower, thereby realizing water recovery and recycling.

[0039] According to the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium in the embodiment of the utility model, the high-temperature steam outlet of the boiler 1 is connected with the inlet of the turbine 2 and the heat storage circulation system 3 respectively, and the heat storage circulation system 3 is used for heat recovery, so that the boiler 1 can meet the daily peak-shaving demand of the power plant without stopping, effectively reducing the mismatch between power generation and power consumption, and at the same time, timely adjustment according to the peak power consumption is achieved, thereby avoiding resource consumption due to the long start and stop time and slow response speed of the boiler 1.

[0040] In some embodiments of the present invention, Figure 1 As shown, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium also includes a flow regulating component 4. The flow regulating component 4 is used to regulate the flow of high-temperature steam from the boiler 1 to the steam turbine 2 and the heat storage circulation system 3. Thus, the flow regulating component 4 is used to regulate the flow of water vapor from the boiler 1 to the steam turbine 2 and the heat storage circulation system 3 through the high-temperature steam outlet, so that the boiler 1 can meet the daily peak-shaving demand of the power plant without stopping, further reducing the mismatch between power generation and power consumption.

[0041] In some embodiments of the present invention, Figure 1 As shown, the high-temperature steam outlet of the boiler 1 is connected to the turbine 2 through a first pipeline 5, and the high-temperature steam outlet of the boiler 1 is connected to the heat storage circulation system 3 through a second pipeline 6. The flow regulating component 4 includes a first valve 41 and a second valve 42. The first valve 41 is arranged on the first pipeline 5, and the second valve 42 is arranged on the second pipeline 6.

[0042] Therefore, the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the steam turbine 2 is controlled by the first valve 41, and the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the heat storage circulation system 3 is controlled by the second valve 42, so that the flow rate of water vapor from the boiler 1 to the steam turbine 2 and the heat storage circulation system 3 is adjusted according to the peak-shaving demand of the power plant, thereby achieving the boiler 1 can meet the daily peak-shaving demand of the power plant without stopping.

[0043] In some embodiments of the present invention, Figure 1 As shown, the flow regulating assembly 4 further includes a first gas flow meter 43 and a second gas flow meter 44, wherein the first gas flow meter 43 is arranged on the first pipeline 5, and the second gas flow meter 44 is arranged on the first pipeline 5. Thus, the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the steam turbine 2 is measured in real time by the first gas flow meter 43, and the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the heat storage cycle system 3 is measured in real time by the second gas flow meter 44, so as to further ensure that the flow rates of water vapor from the boiler 1 to the steam turbine 2 and the heat storage cycle system 3 respectively meet the peak load demand of the power plant, thereby improving reliability.

[0044] In some embodiments of the present invention, Figure 1 As shown, the heat storage circulation system 3 includes a steam heat exchanger 31, a water heat exchanger 36 and a fluidized solid medium. Among them, a first heat exchange pipe 311 is provided in the steam heat exchanger 31, and the high-temperature steam outlet of the boiler 1 is connected to the inlet of the first heat exchange pipe 311. A second heat exchange pipe 361 is provided in the water heat exchanger 36, and one end of the second heat exchange pipe 361 is formed as a cold water inlet 3611 and the other end is formed as a hot water outlet 3612. The fluidized solid medium is suitable for circulating between the steam heat exchanger 31 and the water heat exchanger 36 and exchanging heat with the first heat exchange pipe 311 and the second heat exchange pipe 361 respectively.

[0045] It can be understood that, after the water vapor flowing to the heat storage cycle system 3 through the high-temperature steam outlet enters the first heat exchange pipe 311, it exchanges heat with the low-temperature fluidized solid medium in the steam heat exchanger 31 to increase the temperature of the fluidized solid medium, thereby realizing heat storage of the heat storage cycle system 3. The high-temperature fluidized solid medium after heat exchange with the first heat exchange pipe 311 flows to the water heat exchanger 36 and exchanges heat with the second heat exchange pipe 361, so that the liquid entering the cold water inlet 3611 exchanges heat with the high-temperature fluidized solid medium to form high-temperature hot water and flows out from the hot water outlet 3612, thereby realizing heat release of the heat storage cycle system 3, and the hot water flowing out of the hot water outlet 3612 can flow to the boiler 1 to increase the feed water temperature of the boiler 1, thereby increasing the steam-water circulation volume of the boiler 1, and further meeting the daily peak load demand of the power plant. After exchanging heat with the second heat exchange pipe 361 , the low-temperature fluidized solid medium flows into the steam heat exchanger 31 again to exchange heat with the first heat exchange pipe 311 , thereby realizing the heat storage and heat release cycle of the heat storage cycle system 3 .

[0046] Thus, the fluidized solid medium circulates between the steam heat exchanger 31 and the water heat exchanger 36 and exchanges heat with the first heat exchange pipe 311 and the second heat exchange pipe 361 respectively, thereby realizing the heat storage and heat release functions of the heat storage circulation system 3, thereby realizing heat recovery of the water vapor flowing from the boiler 1 to the heat storage circulation system 3.

[0047] In some embodiments, the heat storage circulation system 3 further includes a conveying pipeline, through which the low-temperature fluidized solid medium after heat exchange with the second heat exchange pipeline 361 is transported to the steam heat exchanger 31 .

[0048] In some embodiments, the fluidized solid medium can be selected from solid particles with stable performance, such as quartz sand, aluminum oxide particles, iron oxide particles, inert ash, etc., which can make the performance stable at high temperatures, help improve heat utilization, and have low cost of use.

[0049] In some embodiments, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium also includes a second cooling tower, and the inlet of the second cooling tower is connected to the outlet of the first heat exchange pipe 311. Thus, the water vapor flowing out of the first heat exchange pipe 311 is cooled by the second cooling tower, thereby realizing water recovery and recycling.

[0050] In some embodiments of the present invention, Figure 1 As shown, the heat storage circulation system 3 also includes a high-temperature fluidized solid medium storage tank 34. The high-temperature fluidized solid medium storage tank 34 is suitable for accommodating the fluidized solid medium after heat exchange with the first heat exchange pipe 311, and the fluidized solid medium is suitable for circulating in sequence between the steam heat exchanger 31, the high-temperature fluidized solid medium storage tank 34 and the water heat exchanger 36. As a result, the high-temperature fluidized solid medium flowing out of the steam heat exchanger 31 enters the high-temperature fluidized solid medium storage tank 34 for storage, realizing temporary storage of the high-temperature fluidized medium, and meeting the demand for storing a large amount of high-temperature fluidized medium.

[0051] In some embodiments of the present invention, Figure 1 As shown, the heat storage circulation system 3 also includes a flow controller 35. The inlet of the flow controller 35 is connected to the outlet of the high-temperature fluidized solid medium storage tank 34, and the outlet of the flow controller 35 is connected to the water heat exchanger 36. The flow controller 35 controls the flow of the fluidized solid medium to the water heat exchanger 36. Therefore, the flow controller 35 controls the flow of the high-temperature fluidized solid medium stored in the high-temperature fluidized solid medium storage tank 34 into the water heat exchanger 36, thereby controlling the heat exchange speed of the water heat exchanger 36 to meet the required use requirements.

[0052] In some embodiments of the present invention, Figure 1 As shown, the bottom wall of the steam heat exchanger 31 is provided with a first flow hood 312, and the first flow hood 312 has a first vent hole. The heat storage circulation system 3 also includes a first fan 37, and the first fan 37 is connected to the steam heat exchanger 31 through the first vent hole.

[0053] It can be understood that the first fan 37 delivers air to the steam heat exchanger 31 through the first ventilation hole, and the air enters the steam heat exchanger 31 from the bottom wall of the steam heat exchanger 31, thereby changing the flow state of the fluidized solid medium in the steam heat exchanger 31 through the first fan 37, effectively preventing the fluidized solid medium from accumulating at the bottom of the steam heat exchanger 31, thereby improving the heat exchange effect between the fluidized solid medium and the first heat exchange tube, and improving the heat storage efficiency of the heat storage cycle system 3. At the same time, the first fan 37 drives the fluidized solid medium to flow from the steam heat exchanger 31 to the water heat exchanger 36, so that the fluidized solid medium circulates between the steam heat exchanger 31 and the water heat exchanger 36.

[0054] Furthermore, the first fan 37 is connected to the steam heat exchanger 31 through the third pipeline 7, and a third valve 71 is provided on the third pipeline 7, thereby controlling the air volume of the first fan 37 to flow to the steam heat exchanger 31 through the third valve 71 to meet different needs. For example, when only the flow state of the fluidized solid medium in the steam heat exchanger 31 needs to be changed to improve the effect, the air volume of the first fan 37 to flow to the steam heat exchanger 31 controlled by the third valve 71 is reduced; when only the fluidized solid medium needs to flow from the steam heat exchanger 31 to the water heat exchanger 36, the air volume of the first fan 37 to flow to the steam heat exchanger 31 controlled by the third valve 71 is increased.

[0055] In some embodiments, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium also includes a dust collector 39, which is used to recover dust generated during the long-term circulation of the fluidized solid medium in the steam heat exchanger 31 and the water heat exchanger 36, thereby improving the heat storage and heat release efficiency of the heat storage circulation system 3.

[0056] In some embodiments of the present invention, Figure 1 As shown, the heat storage cycle system 3 further includes a gas-solid separator 33. The fluidized solid medium is suitable for circulating in the steam heat exchanger 31, the gas-solid separator 33 and the water heat exchanger 36 in sequence, and the gas-solid separator 33 is used to discharge gas.

[0057] It can be understood that, in the process of realizing the high-temperature fluidized solid medium flowing from the steam heat exchanger 31 to the water heat exchanger 36 through the first fan 37, the high-temperature fluidized solid medium and air flow to the water heat exchanger 36 together, and the high-temperature fluidized solid medium flow in the steam heat exchanger 31 first flows to the gas-solid separator 33, and the gas is discharged through the gas-solid separator 33, so that the separated and recovered high-temperature fluidized solid medium flows to the water heat exchanger 36, thereby effectively improving the heat exchange effect between the high-temperature fluidized solid medium and the second heat exchange pipe 361, and improving the heat release efficiency of the heat storage circulation system 3.

[0058] In some embodiments of the present invention, Figure 1 As shown, the bottom wall of the water heat exchanger 36 is provided with a second flow hood 362, and the second flow hood 362 has a second vent hole. The heat storage circulation system 3 also includes a second fan 38, and the second fan 38 is connected to the water heat exchanger 36 through the second vent hole.

[0059] It can be understood that the second fan 38 transports air into the water heat exchanger 36 through the second ventilation hole, and the air enters the water heat exchanger 36 from the bottom wall of the water heat exchanger 36. As a result, the flow state of the fluidized solid medium located in the water heat exchanger 36 is changed by the second fan 38, and the high-temperature fluidized solid medium is effectively prevented from accumulating at the bottom of the water heat exchanger 36, thereby improving the heat exchange effect between the high-temperature fluidized solid medium and the second heat exchange tube, and improving the heat release efficiency of the heat storage circulation system 3.

[0060] Furthermore, the second fan 38 is connected to the water heat exchanger 36 via a fourth pipeline 8, and a fourth valve 81 is provided on the fourth pipeline 8, thereby controlling the air volume of the second fan 38 flowing to the water heat exchanger 36 through the fourth valve 81 to meet different needs.

[0061] Reference below Figure 1 A power plant boiler heat storage system 100 based on fluidized solid high-temperature medium according to a specific embodiment of the present utility model is described in detail. It can be understood that the following description is only an exemplary description and cannot be construed as a limitation to the utility model.

[0062] The power plant boiler heat storage system 100 based on fluidized solid high-temperature medium includes a boiler 1 , a steam turbine 2 and a heat storage circulation system 3 . Among them, it includes a steam heat exchanger 31, a gas-solid separator 33, a high-temperature fluidized solid medium storage tank 34, a flow controller 35, a water heat exchanger 36 and a fluidized solid medium. The steam heat exchanger 31 is provided with a first heat exchange pipe 311, and the high-temperature steam outlet of the boiler 1 is connected to the inlet of the first heat exchange pipe 311. The water heat exchanger 36 is provided with a second heat exchange pipe 361, one end of the second heat exchange pipe 361 is formed as a cold water inlet 3611 and the other end is formed as a hot water outlet 3612. The fluidized solid medium is suitable for circulating in sequence among the steam heat exchanger 31, the gas-solid separator 33, the high-temperature fluidized solid medium storage tank 34, the flow controller 35 and the water heat exchanger 36. The fluidized solid medium exchanges heat with the first heat exchange pipe 311 and the second heat exchange pipe 361 respectively, and the high-temperature steam outlet of the boiler 1 is connected to the turbine 2 and the inlet of the first heat exchange pipe 311 respectively.

[0063] As a result, water vapor flows to the steam turbine 2 and the heat storage circulation system 3 respectively, so that the boiler 1 can meet the daily peak-shaving demand of the power plant without stopping, effectively reducing the mismatch between power generation and power consumption. At the same time, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium of the present application can make timely adjustments according to the peak power consumption, thereby avoiding resource consumption due to the long start and stop time and slow response speed of the boiler 1.

[0064] Specifically, the thermal energy of water vapor is converted into mechanical energy by the steam turbine 2, and the generator coaxially connected to the steam turbine 2 is driven to convert the mechanical energy into electrical energy, thereby realizing the thermal power generation process.

[0065] At the same time, after the water vapor flows to the first heat exchange pipe 311, it exchanges heat with the low-temperature fluidized solid medium in the steam heat exchanger 31 to realize the heat storage of the heat storage circulation system 3. The high-temperature fluidized solid medium flows to the high-temperature fluidized solid medium storage tank 34 through the gas-solid separator 33 to realize the separation and recovery of the high-temperature fluidized solid medium. The high-temperature fluidized solid medium is temporarily stored in the high-temperature fluidized solid medium storage tank 34. The high-temperature fluidized solid medium is stored in the high-temperature fluidized solid medium storage tank 34 according to the demand flow controller 35. The flow rate of the fluidized solid medium entering the water heat exchanger 36, the high-temperature fluidized solid medium entering the water heat exchanger 36 exchanges heat with the second heat exchange pipe 361, so that the liquid entering the cold water inlet 3611 exchanges heat with the high-temperature fluidized solid medium to form high-temperature hot water and flows out from the hot water outlet 3612, thereby realizing the heat release of the heat storage circulation system 3, and the low-temperature fluidized solid medium after the heat exchange flows into the steam heat exchanger 31 again to exchange heat with the first heat exchange pipe 311, realizing the heat storage and heat release cycle of the heat storage circulation system 3.

[0066] Furthermore, the power plant boiler heat storage system 100 based on fluidized solid high-temperature medium also includes a flow regulating component 4, the high-temperature steam outlet of the boiler 1 and the turbine 2 are connected through a first pipeline 5, and the high-temperature steam outlet of the boiler 1 and the heat storage circulation system 3 are connected through a second pipeline 6, and the flow regulating component 4 includes a first valve 41, a second valve 42, a first gas flow meter 43 and a second gas flow meter 44, the first valve 41 and the first gas flow meter 43 are arranged on the first pipeline 5, and the second valve 42 and the second gas flow meter 44 are arranged on the second pipeline 6.

[0067] Thus, the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the steam turbine 2 is controlled by the first valve 41, and the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the heat storage cycle system 3 is controlled by the second valve 42, so as to adjust the flow rate of water vapor from the boiler 1 to the steam turbine 2 and the heat storage cycle system 3 respectively according to the peak-shaving demand of the power plant, and further realize that the boiler 1 can meet the daily peak-shaving demand of the power plant without stopping. The flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the steam turbine 2 is measured in real time by the first gas flowmeter 43, and the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the heat storage cycle system 3 is measured in real time by the second gas flowmeter 44, and the flow rate of water vapor from the high-temperature steam outlet of the boiler 1 to the heat storage cycle system 3 is detected in real time, so as to further ensure that the flow rate of water vapor from the boiler 1 to the steam turbine 2 and the heat storage cycle system 3 respectively meets the peak-shaving demand of the power plant, thereby improving reliability.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power plant boiler heat storage system based on fluidized solid high-temperature medium, characterized in that: include: boiler; Steam turbine; A heat storage circulation system, wherein the high-temperature steam outlet of the boiler is respectively connected to the steam turbine and the inlet of the heat storage circulation system, and the heat storage circulation system is used for heat recovery.

2. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 1 is characterized in that: Also includes: A flow regulating component is used to regulate the flow of high-temperature steam from the boiler to the steam turbine and the heat storage cycle system.

3. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 2 is characterized in that: The high-temperature steam outlet of the boiler is connected to the steam turbine via a first pipeline, and the high-temperature steam outlet of the boiler is connected to the heat storage cycle system via a second pipeline. The flow regulating component includes: a first valve, the first valve being arranged on the first pipeline; A second valve, wherein the second valve is arranged on the second pipeline.

4. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 3 is characterized in that: The flow regulating component also includes: a first gas flow meter, the first gas flow meter being arranged on the first pipeline; A second gas flow meter, wherein the second gas flow meter is arranged on the first pipeline.

5. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 1 is characterized in that: The heat storage cycle system comprises: A steam heat exchanger, wherein a first heat exchange pipe is provided in the steam heat exchanger, and the high-temperature steam outlet of the boiler is connected to the inlet of the first heat exchange pipe; A water heat exchanger, wherein a second heat exchange pipe is provided in the water heat exchanger, wherein one end of the second heat exchange pipe is formed as a cold water inlet and the other end is formed as a hot water outlet; A fluidized solid medium is suitable for circulating between the steam heat exchanger and the water heat exchanger and exchanging heat with the first heat exchange pipe and the second heat exchange pipe respectively.

6. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 5 is characterized in that: The heat storage cycle system also includes: A high-temperature fluidized solid medium storage tank, wherein the high-temperature fluidized solid medium storage tank is suitable for accommodating the fluidized solid medium after heat exchange with the first heat exchange pipe, and the fluidized solid medium is suitable for circulating in sequence between the steam heat exchanger, the high-temperature fluidized solid medium storage tank and the water heat exchanger.

7. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 6 is characterized in that: The heat storage cycle system also includes: A flow controller, wherein the inlet of the flow controller is connected to the outlet of the high-temperature fluidized solid medium storage tank, the outlet of the flow controller is connected to the water heat exchanger, and the flow controller controls the flow of the fluidized solid medium to the water heat exchanger.

8. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 5 is characterized in that: The bottom wall of the steam heat exchanger is provided with a first flow hood, the first flow hood having a first vent hole, and the heat storage circulation system further comprises: A first fan is connected to the steam heat exchanger through the first vent hole.

9. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 8, characterized in that: The heat storage cycle system also includes: The gas-solid separator, the fluidized solid medium is suitable for circulating in sequence between the steam heat exchanger, the gas-solid separator and the water heat exchanger, and the gas-solid separator is used to discharge gas.

10. The power plant boiler heat storage system based on fluidized solid high-temperature medium according to claim 5, characterized in that: The bottom wall of the water heat exchanger is provided with a second air flow cap, the second air flow cap has a second vent hole, and the heat storage circulation system further comprises: A second fan is connected to the water heat exchanger through the second vent hole.

Images