A waste heat recovery thermal power plant energy storage device and method

Abstract

The present application relates to the field of power generation equipment, disclose a kind of waste heat recovery thermal power plant energy storage device and method, including base, the bottom end of the base is fixed with support column, the upper surface of the base one side is provided with first air blower, the first air blower one side is provided with first flow selection module, the other side of the first flow selection module is provided with waste heat recovery module, the waste heat recovery module includes heating chamber and flow selection chamber, U-shaped pipe is arranged in the heating chamber, and the front and rear ends of the U-shaped pipe are respectively sleeved with inlet pipe and outlet pipe;Including the following steps: A, initial ventilation, B, start heating, C, repeated backflow, D, reheat.The present application simplifies the recovery mode, carries out targeted time management on waste heat of different temperature, improves practicability, repeatedly uses waste heat air for temperature up to standard, improves the utilization rate of waste heat air, ensures that the temperature of heated high-temperature liquid is uniform, improves the utilization rate when using the input lower-level equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power generation equipment, in particular to a waste heat recovery thermal power plant energy storage device and method. BACKGROUND

[0002] Waste heat refers to sensible heat and latent heat that is not reasonably utilized in the original design of an industrial energy consumption device due to historical, technical, and conceptual limitations. It includes high-temperature exhaust gas waste heat, cooling medium waste heat, waste gas and waste water waste heat, high-temperature product and slag waste heat, chemical reaction waste heat, combustible waste gas, waste liquid, and waste material waste heat. According to investigations, the total waste heat resources of various industries account for about 17% to 67% of their total fuel consumption, and the recoverable waste heat resources account for about 60% of the total waste heat resources. There are many ways to recover and utilize waste heat. Generally speaking, the best way to utilize waste heat is to comprehensively utilize it, followed by direct utilization, and then indirect utilization (such as waste heat power generation).

[0003] In the process of power generation in a power plant, a large amount of waste heat is discharged, so a waste heat storage device is often used to recover and utilize the waste heat. However, the existing waste heat recovery method is relatively cumbersome, and the waste heat recovery storage device cannot manage different temperatures of waste heat in a targeted manner. The high-temperature liquid heated by waste heat of different temperatures is not uniform in temperature, which leads to low utilization rate when input into lower-level equipment, and low waste heat recovery efficiency, reducing the practicality.

[0004] The existing Chinese patent discloses a waste heat recovery thermal power plant energy storage method and device, with the authorization publication number CN110631400B and the disclosure date of 2020.12.01. The patent technology solves the problem that the waste heat recovery energy storage device cannot utilize waste heat of different temperatures, leading to high working pressure of the waste heat recovery energy storage device and low waste heat recovery efficiency.

[0005] However, the following problems still exist:

[0006] The high-temperature liquid is stirred by the insertion rotating structure to increase its flow rate, which can improve the heat exchange efficiency to a certain extent. However, the connection part is a rotating connection, which is easy to produce gaps and lead to heat loss, and to a certain extent, it reduces the heat recovery and utilization efficiency, so the sealing and thermal insulation of the device are general.

[0007] In view of this situation, the present application provides a waste heat recovery thermal power plant energy storage device and method. SUMMARY

[0008] The application aims to provide a waste heat recovery thermal power plant energy storage device and method to solve the problem of the inability to manage different temperature waste heat, the uneven temperature of high-temperature liquid heated by different temperature waste heat, the low utilization rate when the high-temperature liquid is used in lower equipment, and the low waste heat recovery efficiency.

[0009] To achieve the above-mentioned purpose, the application provides the following technical solutions.

[0010] A waste heat recovery thermal power plant energy storage device, comprising a base, a support column fixed at the bottom end of the base, a first air blower arranged on one side of the upper surface of the base, a first flow selection module arranged on one side of the first air blower, a waste heat recovery module arranged on the other side of the first flow selection module, a control panel and a display screen arranged on the side wall of the waste heat recovery module, the waste heat recovery module comprising a heating chamber and a flow selection chamber, a U-shaped tube arranged in the heating chamber, a liquid inlet pipe and a liquid outlet pipe sleeved on the front and rear ends of the U-shaped tube, respectively, a second flow selection module and a second air blower arranged in the flow selection chamber, respectively, an air inlet pipe arranged between the first air blower and the first flow selection module, a first air outlet pipe and a third air outlet pipe arranged between the first flow selection module and the waste heat recovery module, respectively, a second air outlet pipe arranged between the heating chamber and the flow selection chamber, the first flow selection module and the second flow selection module comprising a first three-phase flow-through electromagnetic reversing valve and a second three-phase flow-through electromagnetic reversing valve, respectively, and a fourth air outlet pipe arranged on one side of the second flow selection module.

[0011] As a further scheme of the application, the input end of the first air blower is connected with a waste heat delivery pipe, the output end of the first air blower is sleeved with an air inlet pipe, the other end of the air inlet pipe is sleeved with one end of the first three-phase flow-through electromagnetic reversing valve, waste heat air is sucked in through the first air blower and enters the first three-phase flow-through electromagnetic reversing valve through the air inlet pipe.

[0012] As a further scheme of the application, the U-shaped tube is arranged at an opening on one side of the first air outlet pipe, electromagnetic valves and water temperature detectors are embedded in the liquid inlet pipe and the liquid outlet pipe, respectively, when the water temperature detector on one side of the liquid outlet pipe detects that the water temperature reaches the standard, the heated liquid is discharged through the electromagnetic valve on the liquid outlet pipe.

[0013] As a further scheme of the application, one end of the first air outlet pipe is sleeved with one end of the first three-phase flow-through electromagnetic reversing valve, the other end of the first air outlet pipe penetrates through the side wall of the heating chamber and extends into the inner cavity of the heating chamber, and waste heat air enters the heating chamber through the first air outlet pipe.

[0014] As a further scheme of the present application: the heating chamber is provided with an opening on the side close to the flow selection chamber, and a second air conveying pipeline is sleeved on the opening, one end of the second air conveying pipeline penetrates into the inner cavity of the flow selection chamber and is sleeved with a second three-phase flow electromagnetic reversing valve, and the waste heat air in the heating chamber enters the second three-phase flow electromagnetic reversing valve through the second air conveying pipeline.

[0015] As a further scheme of the present application: one end of the third air conveying pipeline is sleeved on one end of the first three-phase flow electromagnetic reversing valve, the other end of the third air conveying pipeline is sleeved on one end of the second three-phase flow electromagnetic reversing valve, and a second air blower is arranged in the middle of the third air conveying pipeline, when the second three-phase flow electromagnetic reversing valve connects the third air conveying pipeline with the second air conveying pipeline and the first three-phase flow electromagnetic reversing valve connects the third air conveying pipeline with the first air conveying pipeline, the waste heat air in the second air conveying pipeline continuously flows into the first three-phase flow electromagnetic reversing valve through the second air blower and flows into the first air conveying pipeline.

[0016] As a further scheme of the present application: one end of the fourth air conveying pipeline is sleeved on one end of the second three-phase flow electromagnetic reversing valve, the other end of the fourth air conveying pipeline penetrates through the side wall of the flow selection chamber and extends to the outside of the flow selection chamber, when the second three-phase flow electromagnetic reversing valve connects the second air conveying pipeline with the fourth air conveying pipeline, the waste heat air enters the fourth air conveying pipeline through the second air conveying pipeline and is discharged.

[0017] As a further scheme of the present application: a first air temperature monitor is arranged in the middle of the first air conveying pipeline, and a second air temperature monitor is arranged in the middle of the second air conveying pipeline, the waste heat air in the first air conveying pipeline and the second air conveying pipeline can be detected respectively through the first air temperature monitor and the second air temperature monitor.

[0018] As a further scheme of the present application: a third air temperature monitor is arranged in the middle of the third air conveying pipeline, and a fourth air temperature monitor is arranged in the middle of the fourth air conveying pipeline, the waste heat air in the third air conveying pipeline and the fourth air conveying pipeline can be detected respectively through the third air temperature monitor and the fourth air temperature monitor.

[0019] A waste heat recovery thermal power plant energy storage method, comprising the following steps:

[0020] A, the waste heat air is sucked in through the first air blower, enters the first flow selection module through the air inlet pipeline, at this time, the first flow selection module connects the air inlet pipeline with the first air conveying pipeline through the control of the first three-phase flow electromagnetic reversing valve, the second flow selection module connects the second air conveying pipeline with the fourth air conveying pipeline through the control of the second three-phase flow electromagnetic reversing valve, and the waste heat air will be discharged in turn through the air inlet pipeline, the first flow selection module, the first air conveying pipeline, the heating chamber, the second air conveying pipeline, the second flow selection module and the fourth air conveying pipeline.

[0021] B, when the first air temperature monitor, second air temperature monitor, fourth air temperature monitor detects that the waste heat air reaches the required heating standard, at this time the electromagnetic valve on the liquid inlet pipe is opened, the liquid is continuously merged into the U-shaped pipe, the water temperature detector on the liquid outlet pipe side detects that the water temperature reaches the standard after the liquid is heated by the waste heat air in the heating chamber, the electromagnetic valve on the liquid outlet pipe is opened, and the heated liquid is discharged through the liquid outlet pipe;

[0022] C, after heating for a period of time, when the fourth air temperature monitor detects that the discharged waste heat gas still reaches the required heating standard, at this time the first air blower is stopped, the first three-phase flow electromagnetic reversing valve is connected with the first air duct and the third air duct, the second three-phase flow electromagnetic reversing valve is connected with the second air duct and the third air duct, the second air blower is started, and the waste heat gas is sequentially passed through the first flow selection module, the first air duct, the heating chamber, the second air duct, the second flow selection module and the third air duct for repeated use;

[0023] D, on the basis of reflux heating, when the third air temperature monitor detects that the discharged waste heat gas cannot reach the required heating standard, at this time the second air blower is stopped, the first three-phase flow electromagnetic reversing valve is connected with the air inlet pipe and the first air duct, the second three-phase flow electromagnetic reversing valve is connected with the second air duct and the fourth air duct, and the first air blower is started, returning to the operation process in B;

[0024] Compared with the prior art, the beneficial effects of the present application are:

[0025] 1, the waste heat air is sucked by the first air blower and enters the first flow selection module through the air inlet pipe, at this time the first flow selection module connects the air inlet pipe and the first air duct through the control of the first three-phase flow electromagnetic reversing valve, and the second flow selection module connects the second air duct and the fourth air duct through the control of the second three-phase flow electromagnetic reversing valve, when the first air temperature monitor, the second air temperature monitor and the fourth air temperature monitor detect that the waste heat air reaches the required heating standard, at this time the electromagnetic valve on the liquid inlet pipe is opened, the liquid is continuously merged into the U-shaped pipe, the water temperature detector on the liquid outlet pipe side detects that the water temperature reaches the standard after the liquid is heated by the waste heat air in the heating chamber, the electromagnetic valve on the liquid outlet pipe is opened, and the heated liquid is discharged through the liquid outlet pipe, which simplifies the recycling mode, carries out targeted time management for waste heat of different temperatures, and improves the practicality;

[0026] 2, after heating for a period of time, when the exhaust heat gas still reaches the required heating standard by the fourth air temperature monitor, the first air blower is stopped, the first three-phase flow electromagnetic reversing valve is controlled to connect the first air duct and the third air duct, the second three-phase flow electromagnetic reversing valve is controlled to connect the second air duct and the third air duct, and the second air blower is started, the heat gas will pass through the first flow selection module, the first air duct, the heating chamber, the second air duct, the second flow selection module and the third air duct in turn, the heat air reaching the temperature standard is repeatedly used, and the utilization rate of the heat air is improved;

[0027] 3, on the basis of reflux heating, when the exhaust heat gas cannot reach the required heating standard by the third air temperature monitor, the second air blower is stopped, the first three-phase flow electromagnetic reversing valve is controlled to connect the air inlet duct and the first air duct, the second three-phase flow electromagnetic reversing valve is controlled to connect the second air duct and the fourth air duct, and the first air blower is started, returning to the initial operation process, so that the temperature of the heated high-temperature liquid is uniform, and the utilization rate when used in the lower-level equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] The application will be further described below with reference to the drawings.

[0029] Figure 1 It is a three-dimensional schematic view of a waste heat recovery thermal power plant energy storage device and method.

[0030] Figure 2 It is a side view schematic view of a waste heat recovery thermal power plant energy storage device and method.

[0031] Figure 3 It is Figure 1 It is a structural schematic view of the first air blower and the first flow selection module in the first air blower.

[0032] Figure 4 It is Figure 1 It is a schematic view of the internal structure of the waste heat recovery module.

[0033] Figure 5 It is Figure 1 It is a schematic view of the internal structure of the first flow selection module.

[0034] Figure 6 It is Figure 4 It is a schematic view of the internal structure of the second flow selection module.

[0035] In the figure: 1, base; 2, support column; 3, first air blower; 4, first flow selection module; 5, waste heat recovery module; 6, control panel; 7, display screen; 8, second flow selection module; 9, second air blower; 10, air inlet pipeline; 11, first air conveying pipeline; 12, first air temperature monitor; 13, heating chamber; 14, flow selection chamber; 15, U-shaped tube; 16, liquid inlet pipeline; 17, liquid outlet pipeline; 18, electromagnetic valve; 19, water temperature detector; 20, second air conveying pipeline; 21, second air temperature monitor; 22, third air conveying pipeline; 23, third air temperature monitor; 24, fourth air conveying pipeline; 25, fourth air temperature monitor; 26, first three-phase flow electromagnetic reversing valve; 27, second three-phase flow electromagnetic reversing valve. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Please refer to the drawings in the embodiments of the present application as follows Figures 1-6 The embodiments of the present application are as follows:

[0037] A waste heat recovery thermal power plant energy storage device, in Figures 1-6 In the figure: including base 1, the bottom end of base 1 is fixed with support column 2, one side of the upper surface of base 1 is provided with first air blower 3, one side of first air blower 3 is provided with first flow selection module 4, the other side of first flow selection module 4 is provided with waste heat recovery module 5, the input end of first air blower 3 is connected with waste heat conveying pipeline, the output end of first air blower 3 is sleeved with air inlet pipeline 10, the other end of air inlet pipeline 10 is sleeved with one end of first three-phase flow electromagnetic reversing valve 26, waste heat air is sucked in through first air blower 3, enters first three-phase flow electromagnetic reversing valve 26 through air inlet pipeline 10, one end of first air conveying pipeline 11 is sleeved with one end of first three-phase flow electromagnetic reversing valve 26, the other end of first air conveying pipeline 11 penetrates through the side wall of heating chamber 13 and extends into the inner cavity of heating chamber 13, waste heat air enters heating chamber 13 through first air conveying pipeline 11.

[0038] In Figures 2-4In the middle: the side wall of the waste heat recovery module 5 is respectively provided with a control panel 6 and a display screen 7, the display screen 7 displays the detection value of the first air temperature monitor 12, the second air temperature monitor 21, the third air temperature monitor 23 and the fourth air temperature monitor 25, the waste heat recovery module 5 includes a heating chamber 13 and a flow selection chamber 14, the U-shaped pipe 15 is arranged in the heating chamber 13, the inlet pipe 16 and the outlet pipe 17 are respectively sleeved on the front and rear ends of the U-shaped pipe 15, the U-shaped pipe 15 is arranged at one side opening of the first air conveying pipe 11, the electromagnetic valve 18 and the water temperature detector 19 are respectively embedded in part of the inlet pipe 16 and the outlet pipe 17, when the water temperature detector 19 on one side of the outlet pipe 17 detects that the water temperature reaches the standard, the heated liquid will be discharged through the outlet pipe 17 by opening the electromagnetic valve 18 on the outlet pipe 17, the second flow selection module 8 and the second air blower 9 are respectively arranged in the flow selection chamber 14, an opening is formed on one side of the heating chamber 13 close to the flow selection chamber 14, and the opening is sleeved with the second air conveying pipe 20, one end of the second air conveying pipe 20 penetrates into the inner cavity of the flow selection chamber 14 and is sleeved with the second three-phase flow electromagnetic reversing valve 27, the waste heat air in the heating chamber 13 enters the second three-phase flow electromagnetic reversing valve 27 through the second air conveying pipe 20, one end of the fourth air conveying pipe 24 is sleeved with the second three-phase flow electromagnetic reversing valve 27, and the other end of the fourth air conveying pipe 24 penetrates the side wall of the flow selection chamber 14 and extends to the outside of the flow selection chamber 14, when the second three-phase flow electromagnetic reversing valve 27 connects the second air conveying pipe 20 and the fourth air conveying pipe 24, the waste heat air enters the fourth air conveying pipe 24 through the second air conveying pipe 20 and is discharged.

[0039] In Figures 2-6 In the middle: the side wall of the waste heat recovery module 5 is respectively provided with a control panel 6 and a display screen 7, the display screen 7 displays the detection value of the first air temperature monitor 12, the second air temperature monitor 21, the third air temperature monitor 23 and the fourth air temperature monitor 25, the waste heat recovery module 5 includes a heating chamber 13 and a flow selection chamber 14, the U-shaped pipe 15 is arranged in the heating chamber 13, the inlet pipe 16 and the outlet pipe 17 are respectively sleeved on the front and rear ends of the U-shaped pipe 15, the U-shaped pipe 15 is arranged at one side opening of the first air conveying pipe 11, the electromagnetic valve 18 and the water temperature detector 19 are respectively embedded in part of the inlet pipe 16 and the outlet pipe 17, when the water temperature detector 19 on one side of the outlet pipe 17 detects that the water temperature reaches the standard, the heated liquid will be discharged through the outlet pipe 17 by opening the electromagnetic valve 18 on the outlet pipe 17, the second flow selection module 8 and the second air blower 9 are respectively arranged in the flow selection chamber 14, an opening is formed on one side of the heating chamber 13 close to the flow selection chamber 14, and the opening is sleeved with the second air conveying pipe 20, one end of the second air conveying pipe 20 penetrates into the inner cavity of the flow selection chamber 14 and is sleeved with the second three-phase flow electromagnetic reversing valve 27, the waste heat air in the heating chamber 13 enters the second three-phase flow electromagnetic reversing valve 27 through the second air conveying pipe 20, one end of the fourth air conveying pipe 24 is sleeved with the second three-phase flow electromagnetic reversing valve 27, and the other end of the fourth air conveying pipe 24 penetrates the side wall of the flow selection chamber 14 and extends to the outside of the flow selection chamber 14, when the second three-phase flow electromagnetic reversing valve 27 connects the second air conveying pipe 20 and the fourth air conveying pipe 24, the waste heat air enters the fourth air conveying pipe 24 through the second air conveying pipe 20 and is discharged.

[0040] In Figures 5-6The third air conveying pipeline 22 is sleeved at one end of the first three-phase flow electromagnetic reversing valve 26, the other end of the third air conveying pipeline 22 is sleeved at one end of the second three-phase flow electromagnetic reversing valve 27, and the second air blower 9 is arranged in the middle of the third air conveying pipeline 22; when the second three-phase flow electromagnetic reversing valve 27 connects the third air conveying pipeline 22 with the second air conveying pipeline 20 and the first three-phase flow electromagnetic reversing valve 26 connects the third air conveying pipeline 22 with the first air conveying pipeline 11, the residual heat air in the second air conveying pipeline 20 continuously flows into the first three-phase flow electromagnetic reversing valve 26 through the second air blower 9 and then flows into the first air conveying pipeline 11.

[0041] The working principle of the application is as follows:

[0042] A residual heat recovery thermal power plant energy storage method, comprising the following steps:

[0043] A, the residual heat air is sucked in through the first air blower 3, enters the first flow selection module 4 through the air inlet pipeline 10, at this time, the first flow selection module 4 connects the air inlet pipeline 10 with the first air conveying pipeline 11 by controlling the first three-phase flow electromagnetic reversing valve 26, the second flow selection module 8 connects the second air conveying pipeline 20 with the fourth air conveying pipeline 24 by controlling the second three-phase flow electromagnetic reversing valve 27, and the residual heat air flows out in turn through the air inlet pipeline 10, the first flow selection module 4, the first air conveying pipeline 11, the heating chamber 13, the second air conveying pipeline 20, the second flow selection module 8 and the fourth air conveying pipeline 24;

[0044] B, when the residual heat air reaches the required heating standard through the first air temperature monitor 12, the second air temperature monitor 21 and the fourth air temperature monitor 25 respectively, at this time, the electromagnetic valve 18 on the liquid inlet pipe 16 is opened to continuously flow the liquid into the U-shaped pipe 15, after the liquid is heated by the residual heat air in the heating chamber 13, the water temperature detector 19 on one side of the liquid outlet pipe 17 detects that the water temperature reaches the standard, and then the electromagnetic valve 18 on the liquid outlet pipe 17 is opened, and the heated liquid is discharged through the liquid outlet pipe 17;

[0045] C, after a period of heating, when the discharged residual heat gas still reaches the required heating standard through the fourth air temperature monitor 25, at this time, the first air blower 3 is stopped, the first three-phase flow electromagnetic reversing valve 26 is controlled to connect the first air conveying pipeline 11 with the third air conveying pipeline 22, the second three-phase flow electromagnetic reversing valve 27 is controlled to connect the second air conveying pipeline 20 with the third air conveying pipeline 22, and the second air blower 9 is started, and the residual heat gas is reused in turn through the first flow selection module 4, the first air conveying pipeline 11, the heating chamber 13, the second air conveying pipeline 20, the second flow selection module 8 and the third air conveying pipeline 22;

[0046] D, on the basis of the reflow heating, when the exhaust heat gas detected by the third air temperature monitor 23 does not reach the required heating standard, the second air blower 9 is stopped, the first three-phase flow electromagnetic reversing valve 26 is controlled to connect the air inlet pipeline 10 and the first air conveying pipeline 11, the second three-phase flow electromagnetic reversing valve 27 is controlled to connect the second air conveying pipeline 20 and the fourth air conveying pipeline 24, the first air blower 3 is started, and the operation flow in B is returned to.

[0047] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical scheme and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A residual heat recovery thermal power plant energy storage device comprising a base (1), characterized in that, The base (1) bottom end is fixed with a support column (2), one side of the upper surface of the base (1) is provided with a first air blower (3), one side of the first air blower (3) is provided with a first flow selection module (4), the other side of the first flow selection module (4) is provided with a waste heat recovery module (5), the side wall of the waste heat recovery module (5) is respectively provided with a control panel (6) and a display screen (7), the waste heat recovery module (5) includes a heating chamber (13) and a flow selection chamber (14), the U-shaped pipe (15) is arranged in the heating chamber (13), the U-shaped pipe (15) is respectively sleeved with a liquid inlet pipe (16) and a liquid outlet pipe (17) at the front and rear ends, the flow selection chamber (14) is respectively provided with a second flow selection module (8) and a second air blower (9), the first air blower (3) and the first flow selection module (4) are provided with an air inlet pipe (10), the first flow selection module (4) and the waste heat recovery module (5) are respectively provided with a first air conveying pipe (11) and a third air conveying pipe (22), the heating chamber (13) and the flow selection chamber (14) are provided with a second air conveying pipe (20), the first flow selection module (4) and the second flow selection module (8) respectively include a first three-phase flow electromagnetic reversing valve (26) and a second three-phase flow electromagnetic reversing valve (27), one side of the second flow selection module (8) is provided with a fourth air conveying pipe (24); The U-shaped pipe (15) is arranged at one side opening of the first air conveying pipe (11), and the liquid inlet pipe (16) and the liquid outlet pipe (17) are respectively embedded with an electromagnetic valve (18) and a water temperature detector (19); One end of the first air conveying pipe (11) is sleeved with one end of the first three-phase flow electromagnetic reversing valve (26), and the other end of the first air conveying pipe (11) penetrates through the side wall of the heating chamber (13) and extends into the inner cavity of the heating chamber (13).

2. A waste heat recovery thermal power plant energy storage device according to claim 1, characterized in that, The input end of the first air blower (3) is externally connected with a waste heat conveying pipe, the output end of the first air blower (3) is sleeved with an air inlet pipe (10), and one end of the air inlet pipe (10) is sleeved with one end of the first three-phase flow electromagnetic reversing valve (26).

3. A waste heat recovery thermal power plant energy storage device according to claim 1, characterized in that, An opening is formed in one side of the heating chamber (13) close to the flow selection chamber (14), and the opening is sleeved with a second air conveying pipe (20), and the other end of the second air conveying pipe (20) penetrates into the inner cavity of the flow selection chamber (14) and is sleeved with a second three-phase flow electromagnetic reversing valve (27).

4. A waste heat recovery thermal power plant energy storage device according to claim 1, characterized in that, One end of the third air conveying pipe (22) is sleeved with one end of the first three-phase flow electromagnetic reversing valve (26), the other end of the third air conveying pipe (22) is sleeved with one end of the second three-phase flow electromagnetic reversing valve (27), and the third air conveying pipe (22) is provided with a second air blower (9) in the middle part.

5. A waste heat recovery thermal power plant energy storage device according to claim 3, wherein, One end of the fourth air conveying pipe (24) is sleeved with one end of the second three-phase flow electromagnetic reversing valve (27), and the other end of the fourth air conveying pipe (24) penetrates through the side wall of the flow selection chamber (14) and extends to the outside of the flow selection chamber (14).

6. A waste heat recovery thermal power plant energy storage device according to claim 1, characterized in that, The first air conveying pipe (11) is embedded with a first air temperature monitor (12) in the middle part, and the second air conveying pipe (20) is embedded with a second air temperature monitor (21) in the middle part.

7. A waste heat recovery thermal power plant energy storage device according to claim 1, characterized in that, The third air temperature monitor (23) is embedded in the middle of the third air supply pipeline (22), and the fourth air temperature monitor (25) is embedded in the middle of the fourth air supply pipeline (24).

8. A method of energy storage for a waste heat recovery thermal power plant, for the apparatus of any one of claims 1 to 7, characterized in that, The method comprises the following steps: A, initial ventilation: the waste heat air is sucked in by the first air blower (3), enters the first flow selection module (4) through the air inlet pipeline (10), at this time, the first flow selection module (4) is connected with the air inlet pipeline (10) and the first air supply pipeline (11) by controlling the first three-phase flow electromagnetic reversing valve (26), the second flow selection module (8) is connected with the second air supply pipeline (20) and the fourth air supply pipeline (24) by controlling the second three-phase flow electromagnetic reversing valve (27), and the waste heat air will pass through the air inlet pipeline (10), the first flow selection module (4), the first air supply pipeline (11), the heating chamber (13), the second air supply pipeline (20), the second flow selection module (8) and the fourth air supply pipeline (24) in sequence and is discharged; B, start heating: when the waste heat air reaches the required heating standard by detecting through the first air temperature monitor (12), the second air temperature monitor (21) and the fourth air temperature monitor (25) respectively, at this time, the electromagnetic valve (18) on the liquid inlet pipe (16) is opened, the liquid is continuously poured into the U-shaped pipe (15), the water temperature detector (19) on the liquid outlet pipe (17) detects that the water temperature reaches the standard after the liquid is heated by the waste heat air in the heating chamber (13), and then the electromagnetic valve (18) on the liquid outlet pipe (17) is opened, and the heated liquid is discharged through the liquid outlet pipe (17); C, repeated backflow: after heating for a period of time, when the discharged waste heat gas still reaches the required heating standard by detecting through the fourth air temperature monitor (25), the first air blower (3) is stopped, the first three-phase flow electromagnetic reversing valve (26) is connected with the first air supply pipeline (11) and the third air supply pipeline (22), the second three-phase flow electromagnetic reversing valve (27) is connected with the second air supply pipeline (20) and the third air supply pipeline (22), and the second air blower (9) is started, so that the waste heat gas will pass through the first flow selection module (4), the first air supply pipeline (11), the heating chamber (13), the second air supply pipeline (20), the second flow selection module (8) and the third air supply pipeline (22) in sequence and be repeatedly utilized; D, re-heating: on the basis of C, when the discharged waste heat gas cannot reach the required heating standard by detecting through the third air temperature monitor (23), the second air blower (9) is stopped, the first three-phase flow electromagnetic reversing valve (26) is connected with the air inlet pipeline (10) and the first air supply pipeline (11), the second three-phase flow electromagnetic reversing valve (27) is connected with the second air supply pipeline (20) and the fourth air supply pipeline (24), and the first air blower (3) is started, so as to return to the operation process in B.

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