Waste heat recovery device for thermal power plant

Abstract

The present application discloses a waste heat recovery device for a thermal power plant, which includes a steam tank, a control valve, a power generation device and a storage device. The steam tank includes a shell, a first liquid storage tank and a second liquid storage tank. The shell is sleeved on the outside of the first liquid storage tank and the second liquid storage tank. The first liquid storage tank is used to accommodate a storage space for evaporative liquid, and the second liquid storage tank defines a storage space for waste heat liquid. A heat exchange tube is provided in the first liquid storage tank, one end of the heat exchange tube is connected to the second liquid storage tank, and the other end is used to receive waste heat liquid. An air supply gap is defined between the first liquid storage tank and the second liquid storage tank and the shell, and the shell is provided with an air inlet and an air outlet both connected to the air supply gap; the control valve is provided in the shell, and the control valve is connected to the first liquid storage tank, the second liquid storage tank and the power generation device. When the driving gas in the first liquid storage tank is discharged, the control valve is opened; the power generation device is suitable for being driven by the driving gas. The operator does not need to frequently add evaporative liquid to the first liquid storage tank.

Description

Technical Field

[0001] The present application relates to the field of waste heat recovery, and in particular to a waste heat recovery device for a thermal power plant. Background Art

[0002] In the related art, the waste heat recovery device of a thermal power plant includes a liquid storage tank. The waste heat recovery device of the thermal power plant utilizes the waste heat gas in the boiler and the waste heat liquid used to cool the steam in the turbine to heat and evaporate the liquid in the liquid storage tank. The gas in the liquid storage tank drives the power generation equipment to generate electricity.

[0003] The liquid level in the liquid storage tank needs to be within a preset liquid level range. When the liquid level in the liquid storage tank is lower than the preset liquid level range, the evaporation of the liquid in the liquid storage tank is less, affecting the power generation efficiency of the power generation equipment. When the liquid level in the liquid storage tank is higher than the preset liquid level range, the heating time of the liquid in the liquid storage tank is longer, affecting the power generation efficiency of the power generation equipment. Therefore, the operator needs to frequently add liquid to the liquid storage tank, which increases the operator's workload and reduces the user experience of the waste heat recovery device of the thermal power plant. Summary of the invention

[0004] In order to reduce the number of times operators add liquid to the liquid storage tank, reduce the workload of operators, and improve the user experience of the waste heat recovery device of a thermal power plant, the present application provides a waste heat recovery device for a thermal power plant.

[0005] The waste heat recovery device for a thermal power plant provided in this application adopts the following technical solution:

[0006] A waste heat recovery device for a thermal power plant comprises: a steam tank, the steam tank comprises a shell, a first liquid storage tank and a second liquid storage tank, the second liquid storage tank is located above the first liquid storage tank, the shell is sleeved on the outside of the first liquid storage tank and the second liquid storage tank, the first liquid storage tank defines an evaporation liquid containing space, the second liquid storage tank defines a waste heat liquid containing space, a heat exchange tube is arranged in the first liquid storage tank, one end of the heat exchange tube passes through the first liquid storage tank and is connected with the second liquid storage tank, and the other end passes through the shell and is used to receive waste heat liquid, the outer peripheral wall of the first liquid storage tank and the outer peripheral wall of the second liquid storage tank both define an air supply gap with the inner peripheral wall of the shell, the outer peripheral wall of the shell is provided with an air inlet and an air outlet both connected with the air supply gap, the air inlet is used to receive waste heat gas, and the air outlet is used to discharge the waste heat gas.

[0007] A control valve, wherein the control valve is arranged in the shell and is located between the first liquid storage tank and the second liquid storage tank, the control valve is connected to both the first liquid storage tank and the second liquid storage tank, and the control valve opens when the driving gas in the first liquid storage tank is discharged; a power generation device and an electrical storage component, the power generation device and the electrical storage component are electrically connected, the power generation device is connected to the control valve, and the power generation device is suitable for being driven by the driving gas to generate electricity.

[0008] By adopting the above technical scheme, the waste heat liquid heats the evaporative liquid in the first liquid storage tank through the heat exchange tube, and the waste heat liquid is stored in the second liquid storage tank, and the waste heat gas heats the evaporative liquid through the air supply gap. When the driving gas enters the control valve, the control valve opens, and the waste heat liquid in the second liquid storage tank enters the first liquid storage tank through the control valve to maintain the liquid level of the evaporative liquid in the first liquid storage tank within a preset liquid level range. Compared with the prior art, the operator does not need to frequently add evaporative liquid to the first liquid storage tank, thereby reducing the operator's workload and further improving the user experience of the waste heat recovery device of the thermal power plant.

[0009] Preferably, the control valve includes a valve body and a sealing rod, the valve body defines a pivot space, the valve body is provided with an exhaust pipe and a liquid infusion pipe, the exhaust pipe and the liquid infusion pipe are spaced apart and both are connected to the pivot space, the exhaust pipe is connected between the first liquid storage tank and the power generation equipment, and the liquid infusion pipe is connected between the second liquid storage tank and the first liquid storage tank.

[0010] The blocking rod is pivotally connected in the shell, and the blocking rod is pivotally provided with a first blocking portion and a second blocking portion, the first blocking portion and the second blocking portion are both located on the same side of the blocking rod, the first blocking portion and the second blocking portion are both suitable for rotating around the pivot axis of the blocking rod, the first blocking portion is opposite to the exhaust pipe and is suitable for extending into the exhaust pipe to block the exhaust pipe, the second blocking portion is opposite to the infusion tube and is suitable for extending into the infusion tube to block the infusion tube, the first blocking portion is suitable for being driven by the driving gas to move away from the exhaust pipe, and the first blocking portion drives the second blocking portion to move away from the infusion tube.

[0011] By adopting the above technical solution, when the driving gas enters into the exhaust pipe, the driving gas drives the first blocking part to move away from the exhaust pipe to open the exhaust pipe, and the driving gas enters into the power generation equipment through the exhaust pipe. In the process of the first blocking part moving away from the exhaust pipe, the first blocking part drives the blocking rod to synchronously drive the second blocking part to move away from the infusion pipe to open the infusion pipe, and the waste heat liquid in the second liquid storage tank enters into the first liquid storage tank through the infusion pipe, thereby achieving the technical effect that when the driving gas is discharged from the first liquid storage tank, the waste heat liquid in the second liquid storage tank automatically flows into the first liquid storage tank.

[0012] Preferably, the inner circumferential wall of the exhaust pipe is provided with a first accommodating groove, the first accommodating groove is provided with a first avoidance hole connected with the pivot space, the first blocking portion extends into the exhaust pipe through the first avoidance hole, the first blocking portion is provided with a first stop portion, the first stop portion is suitable for stop cooperation with the bottom wall of the first accommodating groove, and the first accommodating groove is used to accommodate the first blocking portion.

[0013] The inner circumferential wall of the infusion tube is provided with a second accommodating groove, the second accommodating groove is provided with a second avoidance hole communicated with the pivot space, the second blocking portion extends into the infusion tube through the second avoidance hole, the second blocking portion is provided with a second stop portion, the second stop portion is suitable for stop cooperation with the bottom wall of the second accommodating groove, and the second accommodating groove is used to accommodate the second blocking portion.

[0014] By adopting the above technical solution, the first stopper cooperates with the bottom wall of the first receiving groove, so that when the driving gas drives the first blocking part to move away from the exhaust pipe, the first blocking part is prevented from being separated from the exhaust pipe, which makes it difficult for the first blocking part to re-enter the exhaust pipe, thereby improving the working reliability of the waste heat recovery device of the thermal power plant. In addition, the second stopper cooperates with the bottom wall of the second receiving groove, so that when the first blocking part drives the second blocking part to move away from the infusion pipe, the second blocking part is prevented from being separated from the infusion pipe, which makes it difficult for the second blocking part to re-enter the infusion pipe, thereby further improving the working reliability of the waste heat recovery device of the thermal power plant.

[0015] Preferably, the inner circumferential wall of the first avoidance hole and the inner circumferential wall of the second avoidance hole are both provided with sealing members, and the sealing members are in sealing cooperation with the first blocking portion and the second blocking portion.

[0016] By adopting the above technical solution, the seal cooperates with the first sealing part and the second sealing part to seal, so as to prevent the driving gas and waste heat liquid from entering the pivot space, thereby preventing the pivot space from being filled with waste heat liquid and causing the rotation resistance of the sealing rod to increase, and preventing the driving gas from being unable to drive the first sealing part to move away from the exhaust pipe, thereby improving the movement reliability of the sealing rod.

[0017] Preferably, there are multiple blocking rods, multiple exhaust pipes and multiple infusion tubes, and the multiple blocking rods, multiple exhaust pipes and multiple infusion tubes are spaced apart along the first direction of the control valve, and the multiple blocking rods, multiple exhaust pipes and multiple infusion tubes are arranged one by one.

[0018] By adopting the above technical solution, the driving gas in the first liquid storage tank can enter the power generation equipment through multiple exhaust pipes, and the driving gas in the multiple exhaust pipes drives the corresponding first blocking part to move away from the corresponding exhaust pipe, and the first blocking part drives the second blocking part located on the same blocking rod to move away from the corresponding infusion pipe, and the waste heat liquid located in the second liquid storage tank enters the first liquid storage tank through multiple infusion pipes, thereby increasing the flow rate of the waste heat liquid flowing into the first liquid storage tank, so as to maintain the liquid level of the evaporated liquid in the first liquid storage tank within a preset liquid level height range.

[0019] Preferably, the waste heat recovery device of the thermal power plant also includes: a liquid level detection member and a controller, the control valve also includes a driving member, the driving member is arranged in the pivot space, the driving member is transmission-connected to the blocking rod, the driving member is used to drive the blocking rod to drive the second blocking part to move away from the liquid infusion tube, the liquid level detection member is arranged in the first liquid storage tank, the liquid level detection member is used to detect the liquid level height of the evaporated liquid, the liquid level detection member and the driving member are both communication-connected to the controller, and the controller is used to control the operation of the driving member according to the detection signal of the liquid level detection member.

[0020] By adopting the above technical scheme, when the liquid level of the evaporated liquid in the first liquid storage tank is lower than the preset liquid level height range, the controller controls the driving member to start working, and the driving member drives the blocking rod to drive the first blocking part to move away from the exhaust pipe, and drives the second blocking part to move away from the infusion pipe, and the waste heat liquid in the second liquid storage tank continuously enters the first liquid storage tank through the infusion pipe, thereby avoiding too little evaporated liquid in the first liquid storage tank causing too little driving gas to be generated to drive the power generation equipment to generate electricity, and achieving the technical effect of maintaining the liquid level of the evaporated liquid in the first liquid storage tank within the preset liquid level height range.

[0021] Preferably, the waste heat recovery device of the thermal power plant also includes: a diverter, there are multiple heat exchange tubes, the multiple heat exchange tubes are arranged at intervals along the radial direction of the steam tank, the diverter is arranged on the outer peripheral wall of the shell, the diverter is provided with a liquid inlet and multiple liquid outlets, the multiple liquid outlets are arranged in sequence at intervals along the radial direction of the diverter, the multiple heat exchange tubes and the multiple liquid outlets are arranged in a one-to-one correspondence, the end of the heat exchange tube away from the second liquid storage tank is connected to the liquid outlet, the liquid inlet is connected to the multiple liquid outlets, and the liquid inlet is used to receive the waste heat liquid.

[0022] By adopting the above technical solution, a plurality of heat exchange tubes are arranged in the first liquid storage tank, and a diverter is arranged on the outer peripheral wall of the shell. The diverter is used to divert the waste heat liquid to the plurality of heat exchange tubes. The waste heat liquid exchanges heat with the evaporating liquid in the first liquid storage tank through the plurality of heat exchange tubes, thereby improving the efficiency of the waste heat liquid heating the evaporating liquid, and further shortening the time for the evaporating liquid to evaporate into the driving gas.

[0023] Preferably, an overflow pipe is provided at the upper end of the second liquid storage tank along the height direction of the steam tank, one end of the overflow pipe is connected to the second liquid storage tank, and the other end passes through the shell, and the waste heat liquid located in the second liquid storage tank is suitable for flowing out to the external environment through the overflow pipe.

[0024] By adopting the above technical solution, when the second liquid storage tank is full of waste heat liquid, the waste heat liquid in the second liquid storage tank flows out of the second liquid storage tank through the overflow pipe, thereby preventing the waste heat liquid from continuously entering the second liquid storage tank, and preventing the waste heat liquid in the second liquid storage tank from squeezing the control valve and causing damage to the control valve, thereby improving the working reliability of the waste heat recovery device of the thermal power plant.

[0025] Preferably, a spiral track is provided in the air supply gap, and the spiral track is wound around the outer peripheral wall of the first liquid storage tank and the outer peripheral wall of the second liquid storage tank. The spiral track abuts against the inner peripheral wall of the shell, the outer peripheral wall of the first liquid storage tank and the outer peripheral wall of the second liquid storage tank. Along the height direction of the steam tank, one of the air inlet and the air outlet is located at the upper end of the shell, and the other is located at the lower end of the shell, and the waste heat gas flows along the spiral track to the air outlet.

[0026] By adopting the above technical solution, by setting a spiral track in the air supply gap, the spiral track can increase the time for the waste heat gas to move from the air inlet to the air outlet, thereby extending the time for the waste heat gas to heat the evaporating liquid in the first liquid storage tank, so that the waste heat gas can fully exchange heat with the evaporating liquid, thereby improving the heat utilization rate of the waste heat gas.

[0027] Preferably, the outer peripheral wall of the shell is provided with a heat insulation layer.

[0028] By adopting the above technical solution, by arranging a thermal insulation layer on the outer peripheral wall of the shell, the thermal insulation layer can reduce the heat radiated by the waste heat gas to the external environment, thereby reducing the heat loss of the waste heat gas, so that the heat of the waste heat gas can be used to heat the evaporating liquid as much as possible, thereby improving the heat utilization rate of the waste heat gas.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. The waste heat liquid heats the evaporation liquid in the first liquid storage tank through the heat exchange tube, and the waste heat liquid is stored in the second liquid storage tank. The waste heat gas heats the evaporation liquid through the air supply gap. When the driving gas enters the control valve, the control valve is opened, and the waste heat liquid in the second liquid storage tank enters the first liquid storage tank through the control valve to maintain the liquid level of the evaporation liquid in the first liquid storage tank within a preset liquid level range. Compared with the prior art, the operator does not need to frequently add evaporation liquid to the first liquid storage tank, thereby reducing the workload of the operator, thereby improving the user experience of the waste heat recovery device of the thermal power plant;

[0031] 2. When the driving gas enters the exhaust pipe, the driving gas drives the first blocking part to move away from the exhaust pipe to open the exhaust pipe, and the driving gas enters the power generation equipment through the exhaust pipe. In the process of the first blocking part moving away from the exhaust pipe, the first blocking part drives the blocking rod to synchronously drive the second blocking part to move away from the liquid infusion pipe to open the liquid infusion pipe, and the waste heat liquid in the second liquid storage tank enters the first liquid storage tank through the liquid infusion pipe, thereby achieving the technical effect that when the driving gas is discharged from the first liquid storage tank, the waste heat liquid in the second liquid storage tank automatically flows into the first liquid storage tank;

[0032] 3. By arranging an insulation layer on the outer peripheral wall of the shell, the insulation layer can reduce the heat radiated by the waste heat gas to the external environment, thereby reducing the heat loss of the waste heat gas, so that the heat of the waste heat gas can be used to heat the evaporating liquid as much as possible, thereby improving the heat utilization rate of the waste heat gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of a waste heat recovery device for a thermal power plant according to an embodiment of the present application;

[0034] Figure 2 is a cross-sectional view of a control valve according to an embodiment of the present application;

[0035] Figure 3 It is a cross-sectional view of the control valve at another angle according to an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100. Waste heat recovery device for thermal power plants;

[0038] 1. Steam tank; 11. Shell; 111. Spiral track; 12. First liquid storage tank; 121. Evaporation liquid storage space; 122. Heat exchange tube; 13. Second liquid storage tank; 131. Waste heat liquid storage space; 132. Overflow pipe; 14. Air supply gap; 15. Air inlet; 16. Air outlet; 17. Insulation layer;

[0039] 2. Control valve; 21. Valve body; 211. Pivoting space; 212. Exhaust pipe; 2121. First receiving groove; 2122. First avoidance hole; 2123. Sealing member; 213. Infusion tube; 2131. Second receiving groove; 2132. Second avoidance hole; 22. Blocking rod; 221. First blocking part; 2211. First stop part; 222. Second blocking part; 2221. Second stop part; 23. Driving member;

[0040] 3. Power generation equipment; 4. Power storage components; 5. Liquid level detection components;

[0041] 6. Flow divider; 61. Liquid inlet; 62. Liquid outlet. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-Figure 3 This application is described in further detail.

[0043] The embodiment of the present application discloses a waste heat recovery device 100 for a thermal power plant.

[0044] Reference Figure 1 and Figure 2 According to the embodiment of the present application, the waste heat recovery device 100 of the thermal power plant comprises: a steam tank 1, a control valve 2, a power generation device 3 and an electric storage device 4. The steam tank 1 comprises a shell 11, a first liquid storage tank 12 and a second liquid storage tank 13. Along the height direction of the steam tank 1, the height direction of the steam tank 1 can refer to Figure 1 In the up and down direction, the second liquid storage tank 13 is located above the first liquid storage tank 12. In some specific embodiments, the second liquid storage tank 13 can be arranged opposite to the first liquid storage tank 12. The shell 11 is sleeved on the outside of the first liquid storage tank 12 and the second liquid storage tank 13. The first liquid storage tank 12 defines an evaporative liquid containing space 121, and the evaporative liquid containing space 121 is used to contain evaporative liquid. The evaporative liquid is heated and evaporated into driving gas. The second liquid storage tank 13 defines a waste heat liquid containing space 131, and the waste heat liquid containing space 131 is used to contain waste heat liquid.

[0045] In some specific embodiments, both the evaporation liquid and the waste heat liquid may be water.

[0046] A heat exchange tube 122 is provided in the first liquid storage tank 12, one end of the heat exchange tube 122 passes through the first liquid storage tank 12 and is connected to the second liquid storage tank 13, and the other end of the heat exchange tube 122 passes through the shell 11 and is used to receive waste heat liquid. Specifically, the upper end of the heat exchange tube 122 passes through the first liquid storage tank 12 and is connected to the second liquid storage tank 13, and the lower end of the heat exchange tube 122 is connected to a waste heat liquid conveying device, and the waste heat liquid conveying device is used to convey waste heat liquid to the heat exchange tube 122. The waste heat liquid heats the evaporating liquid in the first liquid storage tank 12 through the heat exchange tube 122, so that the evaporating liquid evaporates into a driving gas. After the waste heat liquid completes heating the evaporating liquid, the waste heat liquid enters the second liquid storage tank 13 through the upper end of the heat exchange tube 122.

[0047] In some specific embodiments, the shape of the heat exchange tube 122 can be constructed as a serpentine shape. Such a configuration can increase the time for the waste heat liquid to pass through the first liquid storage tank 12, thereby increasing the time for the waste heat liquid to heat the evaporating liquid, so that the waste heat liquid and the evaporating liquid can undergo sufficient heat exchange.

[0048] In addition, an air supply gap 14 is defined between the outer peripheral wall of the first liquid storage tank 12 and the outer peripheral wall of the second liquid storage tank 13 and the inner peripheral wall of the shell 11. The outer peripheral wall of the shell 11 is provided with an air inlet 15 and an air outlet 16 both connected to the air supply gap 14. The air inlet 15 is used to receive waste heat gas, and the air outlet 16 is used to discharge the waste heat gas. Specifically, along the height direction of the steam tank 1, one of the air inlet 15 and the air outlet 16 is located above the other. In some specific embodiments, the air outlet 16 is located above the air inlet 15. The air inlet 15 is connected to a waste heat gas conveying device, and the waste heat gas conveying device is used to convey waste heat gas to the air supply gap 14. The waste heat gas in the air supply gap 14 heats the evaporating liquid in the first liquid storage tank 12 so that the evaporating liquid evaporates into a driving gas. After the waste heat gas completes heating the evaporating liquid, the waste heat gas leaves the air supply gap 14 through the air outlet 16.

[0049] Furthermore, the waste heat gas is also used to heat and keep the waste heat liquid in the second liquid storage tank 13, so that the heat in the waste heat gas can be fully utilized. It should be noted that the temperature of the waste heat gas is greater than the temperature of the waste heat liquid.

[0050] In some specific embodiments, the waste heat gas may be coal-fired flue gas in a thermal power plant boiler.

[0051] That is, the waste heat gas and the waste heat liquid jointly heat the evaporated liquid in the first liquid storage tank 12 , and the waste heat gas is also used to heat and keep warm the waste heat gas in the second liquid storage tank 13 .

[0052] The control valve 2 is arranged in the shell 11 and is located between the first liquid storage tank 12 and the second liquid storage tank 13. Specifically, the second liquid storage tank 13 is located above the control valve 2, and the first liquid storage tank 12 is located below the control valve 2. The control valve 2 is connected with the first liquid storage tank 12 and the second liquid storage tank 13. When the driving gas in the first liquid storage tank 12 is discharged, the control valve 2 opens, the power generation equipment 3 and the storage element 4 are electrically connected, the power generation equipment 3 is connected with the control valve 2, the power generation equipment 3 is suitable for being driven by the driving gas to generate electricity, and the storage element 4 is used to store the electric energy generated by the power generation equipment 3.

[0053] In some specific embodiments, the power generation device 3 may be a turbine, and the power storage device 4 may be a battery.

[0054] Specifically, after the evaporated liquid in the first liquid storage tank 12 is vaporized into driving gas, the driving gas enters the control valve 2, and then the driving gas enters the power generation equipment 3 through the control valve 2 and drives the power generation equipment 3 to generate electricity. When the driving gas enters the control valve 2, the control valve 2 controls the waste heat liquid in the second liquid storage tank 13 to flow into the first liquid storage tank 12 through the control valve 2. That is to say, the control valve 2 controls the waste heat liquid in the second liquid storage tank 13 to enter the first liquid storage tank 12 according to the driving gas, so as to maintain the liquid level of the evaporated liquid in the first liquid storage tank 12 within a preset liquid level range.

[0055] In some specific embodiments, the control valve 2 may include a gas detection component, a gate valve and a controller. The gas detection component is used to detect the driving gas. A delivery channel connected between the first liquid storage tank 12 and the second liquid storage tank 13 is provided in the control valve 2. The waste heat liquid in the second liquid storage tank 13 enters the first liquid storage tank 12 through the delivery channel. The gate valve is provided in the delivery channel and is used to open or close the delivery channel. The gas detection component and the gate valve are both communicatively connected to the controller. The controller is used to control the gate valve to open or close according to the detection signal of the gas detection component.

[0056] When the driving gas enters the control valve 2, the gas detection component generates a detection signal, and the controller controls the gate valve to open the delivery channel according to the detection signal of the gas detection component, so that the waste heat liquid in the second liquid storage tank 13 enters the first liquid storage tank 12. When there is no driving gas in the control valve 2, the controller controls the gate valve to close the delivery channel according to the detection signal of the gas detection component.

[0057] Thus, the waste heat liquid heats the evaporating liquid in the first liquid storage tank 12 through the heat exchange tube 122, and the waste heat liquid is stored in the second liquid storage tank 13, and the waste heat gas heats the evaporating liquid through the air supply gap 14. When the driving gas enters the control valve 2, the control valve 2 opens, and the waste heat liquid in the second liquid storage tank 13 enters the first liquid storage tank 12 through the control valve 2, so as to maintain the liquid level of the evaporating liquid in the first liquid storage tank 12 within a preset liquid level range. Compared with the prior art, the operator does not need to frequently add evaporating liquid to the first liquid storage tank 12, thereby reducing the operator's workload and further improving the user experience of the waste heat recovery device 100 of the thermal power plant.

[0058] Reference Figure 2 In some embodiments of the present application, the control valve 2 includes a valve body 21 and a blocking rod 22. The valve body 21 defines a pivoting space 211. The valve body 21 is provided with an exhaust pipe 212 and a liquid infusion pipe 213. The exhaust pipe 212 and the liquid infusion pipe 213 are arranged separately and are both connected to the pivoting space 211. In some specific embodiments, along the height direction of the control valve 2, the height direction of the control valve 2 can refer to Figure 2 In the up-down direction, the pivot space 211 is located above the exhaust pipe 212 and the liquid infusion pipe 213. Along the second direction of the control valve 2, the second direction of the control valve 2 can refer to Figure 2 In the left-right direction, the exhaust pipe 212 is located on the right side of the infusion pipe 213, the upper end of the infusion pipe 213 and the upper end of the exhaust pipe 212 are both connected to the pivot space 211, the exhaust pipe 212 is connected between the first liquid storage tank 12 and the power generation equipment 3, the driving gas enters the power generation equipment 3 through the exhaust pipe 212, the infusion pipe 213 is connected between the second liquid storage tank 13 and the first liquid storage tank 12, the waste heat liquid in the second liquid storage tank 13 enters the first liquid storage tank 12 through the infusion pipe 213.

[0059] In addition, the blocking rod 22 is pivotally connected to the valve body 21 and is located in the pivot space 211. The blocking rod 22 is pivotally provided with a first blocking portion 221 and a second blocking portion 222. The first blocking portion 221 and the second blocking portion 222 are both located on the same side of the blocking rod 22. In some specific embodiments, the right end of the blocking rod 22 is pivotally connected to the valve body 21, and the lower end of the blocking rod 22 is pivotally provided with a first blocking portion 221 and a second blocking portion 222. The first blocking portion 221 and the second blocking portion 222 are spaced apart along the second direction of the control valve 2, and the first blocking portion 221 and the second blocking portion 222 are spaced apart from each other along the second direction of the control valve 2. The first sealing portion 221 and the second sealing portion 222 are both located on the left side of the pivot connection between the sealing rod 22 and the valve body 21, the upper end portion of the first sealing portion 221 and the upper end portion of the second sealing portion 222 are both pivotally connected to the sealing rod 22, the first sealing portion 221 is suitable for rotating around the pivot axis between the first sealing portion 221 and the sealing rod 22, the second sealing portion 222 is suitable for rotating around the pivot axis between the second sealing portion 222 and the sealing rod 22, and the first sealing portion 221 and the second sealing portion 222 are both suitable for rotating around the pivot axis between the sealing rod 22 and the valve body 21.

[0060] The first blocking portion 221 is opposite to the exhaust pipe 212 and is suitable for extending into the exhaust pipe 212 to block the exhaust pipe 212. The second blocking portion 222 is opposite to the infusion tube 213 and is suitable for extending into the infusion tube 213 to block the infusion tube 213. The first blocking portion 221 is suitable for being driven by the driving gas to move away from the exhaust pipe 212, and the first blocking portion 221 drives the second blocking portion 222 to move away from the infusion tube 213.

[0061] Specifically, when the driving gas enters the exhaust pipe 212, the driving gas drives the first blocking part 221 to move away from the exhaust pipe 212 to open the exhaust pipe 212, and the driving gas enters the power generation equipment 3 through the exhaust pipe 212. In the process of the first blocking part 221 moving away from the exhaust pipe 212, the first blocking part 221 drives the blocking rod 22 and synchronously drives the second blocking part 222 to move away from the infusion pipe 213 to open the infusion pipe 213, and the waste heat liquid in the second liquid storage tank 13 enters the first liquid storage tank 12 through the infusion pipe 213, thereby achieving the technical effect that when the driving gas is discharged from the first liquid storage tank 12, the waste heat liquid in the second liquid storage tank 13 automatically flows into the first liquid storage tank 12.

[0062] It should be noted that the diameter of the exhaust pipe 212 is larger than the diameter of the infusion pipe 213, so as to avoid the amount of waste heat liquid flowing into the first liquid storage tank 12 being equal to the evaporation amount of the evaporating liquid, thereby avoiding the liquid level of the evaporating liquid in the first liquid storage tank 12 from exceeding the preset liquid level height range.

[0063] Reference Figure 2In some embodiments of the present application, the inner circumferential wall of the exhaust pipe 212 is provided with a first accommodating groove 2121. In some specific embodiments, the shape of the exhaust pipe 212 can be constructed as an L-shape, the first accommodating groove 2121 is located at the top of the inner circumferential wall of the exhaust pipe 212, and the first accommodating groove 2121 is opposite to the turning point of the exhaust pipe 212, the first accommodating groove 2121 is provided with a first avoidance hole 2122 connected to the pivot space 211, the first blocking portion 221 passes through the first avoidance hole 2122 and extends into the exhaust pipe 212, along the height direction of the control valve 2, the lower end of the first blocking portion 221 is opposite to the turning point of the exhaust pipe 212, and the lower end of the first blocking portion 221 is suitable for abutting against the inner circumferential wall of the exhaust pipe 212 to block the exhaust pipe 212.

[0064] The first sealing portion 221 is provided with a first stop portion 2211. Specifically, the outer peripheral wall of the first sealing portion 221 is provided with the first stop portion 2211. The first stop portion 2211 is suitable for abutting with the bottom wall of the first accommodating groove 2121. The first accommodating groove 2121 is used to accommodate the first sealing portion 221. The first stop portion 2211 abuts with the bottom wall of the first accommodating groove 2121 to prevent the first sealing portion 221 from detaching from the exhaust pipe 212 when the driving gas drives the first sealing portion 221 to move away from the exhaust pipe 212, thereby preventing the first sealing portion 221 from re-entering the exhaust pipe 212, thereby improving the working reliability of the waste heat recovery device 100 of the thermal power plant.

[0065] The inner wall of the infusion tube 213 is provided with a second receiving groove 2131. In some specific embodiments, the shape of the infusion tube 213 can be constructed into an L shape. The second receiving groove 2131 is located at the top of the inner wall of the infusion tube 213, and the second receiving groove 2131 is opposite to the turning point of the infusion tube 213. The second receiving groove 2131 is provided with a second avoidance hole 2132 connected to the pivot space 211. The second blocking portion 222 extends into the infusion tube 213 through the second avoidance hole 2132. The lower end of the second blocking portion 222 is opposite to the turning point of the infusion tube 213. The lower end of the second blocking portion 222 is suitable for abutting against the inner wall of the infusion tube 213 to block the infusion tube 213.

[0066] The second sealing portion 222 is provided with a second stop portion 2221. Specifically, the outer peripheral wall of the second sealing portion 222 is provided with a second stop portion 2221. The second stop portion 2221 is suitable for abutting with the bottom wall of the second accommodating groove 2131. The second accommodating groove 2131 is used to accommodate the second sealing portion 222. The second stop portion 2221 abuts with the bottom wall of the second accommodating groove 2131 to prevent the second sealing portion 222 from detaching from the infusion pipe 213 when the first sealing portion 221 drives the second sealing portion 222 to move away from the infusion pipe 213, thereby preventing the second sealing portion 222 from re-entering the infusion pipe 213. This can further improve the working reliability of the waste heat recovery device 100 of the thermal power plant.

[0067] Reference Figure 2 In some embodiments of the present application, the inner circumferential wall of the first avoidance hole 2122 and the inner circumferential wall of the second avoidance hole 2132 are both provided with a sealing member 2123, and the sealing member 2123 is sealed with the first sealing portion 221 and the second sealing portion 222. By sealing the sealing member 2123 with the first sealing portion 221 and the second sealing portion 222, the driving gas and the waste heat liquid can be prevented from entering the pivot space 211, thereby preventing the pivot space 211 from being filled with waste heat liquid and causing an increase in the rotational resistance of the blocking rod 22, and preventing the driving gas from being unable to drive the first blocking portion 221 to move away from the exhaust pipe 212, thereby improving the movement reliability of the blocking rod 22.

[0068] In some specific embodiments, the seal 2123 may be a rubber sealing ring, but the present application is not limited thereto, and the seal 2123 may also be a rubber sealing gasket.

[0069] Reference Figure 2 and Figure 3 In some embodiments of the present application, the blocking rod 22, the exhaust pipe 212 and the infusion pipe 213 are all multiple, and the multiple blocking rods 22, the multiple exhaust pipes 212 and the multiple infusion pipes 213 are spaced apart and arranged along the first direction of the control valve 2. The first direction of the control valve 2 can refer to Figure 3 In the front-to-back direction, the plurality of blocking rods 22, the plurality of exhaust pipes 212 and the plurality of infusion tubes 213 are all arranged in one-to-one correspondence.

[0070] Specifically, the driving gas in the first liquid storage tank 12 can enter the power generation equipment 3 through multiple exhaust pipes 212, thereby improving the exhaust efficiency of the driving gas, and further improving the power generation efficiency of the power generation equipment 3, and the driving gas in the multiple exhaust pipes 212 drives the corresponding first blocking part 221 to move away from the corresponding exhaust pipe 212, and the first blocking part 221 drives the second blocking part 222 located on the same blocking rod 22 to move away from the corresponding infusion pipe 213, and the waste heat liquid located in the second liquid storage tank 13 enters the first liquid storage tank 12 through multiple infusion pipes 213, thereby increasing the flow rate of the waste heat liquid flowing into the first liquid storage tank 12, so as to maintain the liquid level of the evaporated liquid in the first liquid storage tank 12 within a preset liquid level height range.

[0071] Reference Figure 1 and Figure 2 In some embodiments of the present application, the waste heat recovery device 100 of a thermal power plant may further include: a liquid level detection component 5 and a controller. The control valve 2 also includes a driving component 23. The driving component 23 is arranged in the pivot space 211. The driving component 23 is transmission-connected to the blocking rod 22. The driving component 23 is used to drive the blocking rod 22 to drive the second blocking portion 222 to move away from the liquid infusion pipe 213. The liquid level detection component 5 is arranged in the first liquid storage tank 12. The liquid level detection component 5 is used to detect the liquid level of the evaporated liquid. The liquid level detection component 5 and the driving component 23 are both communication-connected to the controller. The controller is used to control the operation of the driving component 23 according to the detection signal of the liquid level detection component 5.

[0072] Specifically, when the liquid level of the evaporated liquid in the first liquid storage tank 12 is lower than the preset liquid level height range, the liquid level detection component 5 generates a detection signal, and the controller controls the driving component 23 to start working according to the detection signal of the liquid level detection component 5, and the driving component 23 drives the blocking rod 22 to drive the first blocking part 221 to move away from the exhaust pipe 212, and drives the second blocking part 222 to move away from the infusion pipe 213, and the waste heat liquid in the second liquid storage tank 13 continues to enter the first liquid storage tank 12 through the infusion pipe 213, thereby avoiding the situation where there is too little evaporated liquid in the first liquid storage tank 12, resulting in too little driving gas generated to drive the power generation equipment 3 to generate electricity, and can achieve the technical effect of maintaining the liquid level of the evaporated liquid in the first liquid storage tank 12 within the preset liquid level height range.

[0073] In some specific embodiments, the liquid level detection component 5 can be a float type liquid level switch, and the driving component 23 can be an electromagnet, but the present application is not limited thereto. The liquid level detection component 5 can also be a photoelectric liquid level sensor, etc., and the driving component 23 can also be a cylinder, etc.

[0074] Reference Figure 1In some embodiments of the present application, the waste heat recovery device 100 of the thermal power plant may further include: a diverter 6, a plurality of heat exchange tubes 122, the plurality of heat exchange tubes 122 are arranged at intervals along the radial direction of the steam tank 1, the diverter 6 is arranged on the outer peripheral wall of the shell 11, the diverter 6 is provided with a liquid inlet 61 and a plurality of liquid outlets 62, the plurality of liquid outlets 62 are arranged in sequence at intervals along the radial direction of the diverter 6, the plurality of heat exchange tubes 122 are arranged in a one-to-one correspondence with the plurality of liquid outlets 62, one end of the heat exchange tube 122 away from the second liquid storage tank 13 is connected to the liquid outlet 62, the liquid inlet 61 is connected to the plurality of liquid outlets 62, the liquid inlet 61 is used to receive waste heat liquid, specifically, the liquid inlet 61 is connected to the waste heat liquid conveying equipment, and the waste heat liquid conveying equipment conveys the waste heat liquid to the liquid inlet 61.

[0075] By arranging a plurality of heat exchange tubes 122 in the first liquid storage tank 12 and arranging a diverter 6 on the outer peripheral wall of the shell 11, the diverter 6 is used to divert the waste heat liquid to the plurality of heat exchange tubes 122. The waste heat liquid exchanges heat with the evaporating liquid in the first liquid storage tank 12 through the plurality of heat exchange tubes 122, thereby improving the efficiency of the waste heat liquid heating the evaporating liquid, and further shortening the time for the evaporating liquid to evaporate into the driving gas.

[0076] In some specific embodiments, the flow divider 6 may be a liquid flow divider or the like.

[0077] Reference Figure 1 In some embodiments of the present application, an overflow pipe 132 is provided at the upper end of the second liquid storage tank 13 along the height direction of the steam tank 1. In some specific embodiments, the overflow pipe 132 can be provided on the top wall of the second liquid storage tank 13, one end of the overflow pipe 132 is connected to the second liquid storage tank 13, and the other end of the overflow pipe 132 passes through the shell 11, and the waste heat liquid in the second liquid storage tank 13 is suitable for flowing out to the external environment through the overflow pipe 132.

[0078] Specifically, when the second liquid storage tank 13 is full of waste heat liquid, the waste heat liquid in the second liquid storage tank 13 flows out of the second liquid storage tank 13 through the overflow pipe 132, thereby preventing the waste heat liquid from continuously entering the second liquid storage tank 13, and preventing the waste heat liquid in the second liquid storage tank 13 from squeezing the control valve 2 and causing damage to the control valve 2, thereby improving the working reliability of the waste heat recovery device 100 of the thermal power plant.

[0079] Reference Figure 1In some embodiments of the present application, a spiral track 111 is provided in the air supply gap 14, and the spiral track 111 is wound around the outer peripheral wall of the first liquid storage tank 12 and the outer peripheral wall of the second liquid storage tank 13. The spiral track 111 abuts against the inner peripheral wall of the shell 11, the outer peripheral wall of the first liquid storage tank 12, and the outer peripheral wall of the second liquid storage tank 13. Specifically, the end wall of the spiral track 111 close to the shell 11 abuts against the inner peripheral wall of the shell 11, and the end wall of the spiral track 111 away from the shell 11 abuts against the outer peripheral wall of the first liquid storage tank 12 and the outer peripheral wall of the second liquid storage tank 13.

[0080] Furthermore, along the height direction of the steam tank 1, one of the air inlet 15 and the air outlet 16 is located at the upper end of the shell 11, and the other of the air inlet 15 and the air outlet 16 is located at the lower end of the shell 11. In some specific embodiments, the air inlet 15 is located at the lower end of the shell 11, and the air outlet 16 is located at the upper end of the shell 11, and the waste heat gas flows along the spiral track 111 to the air outlet 16.

[0081] By setting a spiral track 111 in the air supply gap 14, the spiral track 111 can increase the time for the waste heat gas to move from the air inlet 15 to the air outlet 16, thereby extending the time for the waste heat gas to heat the evaporating liquid in the first liquid storage tank 12, so that the waste heat gas can fully exchange heat with the evaporating liquid, thereby improving the heat utilization rate of the waste heat gas.

[0082] In addition, the waste heat gas is also used to heat and keep warm the waste heat liquid in the second liquid storage tank 13, thereby preventing the temperature of the waste heat liquid in the second liquid storage tank 13 from being too low, and preventing the temperature of the evaporating liquid from being too low after the waste heat liquid enters the first liquid storage tank 12 and the waste heat liquid and the evaporating liquid are mixed, resulting in the evaporating liquid needing to be heated for a long time, thereby improving the user experience of the waste heat recovery device 100 of the thermal power plant.

[0083] Reference Figure 1 In some embodiments of the present application, a thermal insulation layer 17 is provided on the outer peripheral wall of the shell 11. By providing the thermal insulation layer 17 on the outer peripheral wall of the shell 11, the thermal insulation layer 17 can reduce the heat radiated by the waste heat gas to the external environment, thereby reducing the heat loss of the waste heat gas, so that the heat of the waste heat gas can be used to heat the evaporating liquid as much as possible, thereby improving the heat utilization rate of the waste heat gas.

[0084] In some specific embodiments, the material of the thermal insulation layer 17 may be glass fiber, but the present application is not limited thereto. The material of the thermal insulation layer 17 may also be calcium silicate or the like.

[0085] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A waste heat recovery device for a thermal power plant, characterized in that: include: A steam tank (1), the steam tank (1) comprising a shell (11), a first liquid storage tank (12) and a second liquid storage tank (13), the second liquid storage tank (13) being located above the first liquid storage tank (12), the shell (11) being sleeved on the outside of the first liquid storage tank (12) and the second liquid storage tank (13), the first liquid storage tank (12) defining an evaporation liquid containing space (121), the second liquid storage tank (13) defining a waste heat liquid containing space (131), the first liquid storage tank (12) being provided with a heat exchange tube (122), the heat exchange tube (122) ) one end of which passes through the first liquid storage tank (12) and is connected to the second liquid storage tank (13), and the other end of which passes through the shell (11) and is used to receive waste heat liquid, the outer peripheral wall of the first liquid storage tank (12) and the outer peripheral wall of the second liquid storage tank (13) both define an air supply gap (14) with the inner peripheral wall of the shell (11), and the outer peripheral wall of the shell (11) is provided with an air inlet (15) and an air outlet (16) both of which are connected to the air supply gap (14), the air inlet (15) is used to receive waste heat gas, and the air outlet (16) is used to discharge the waste heat gas; a control valve (2), the control valve (2) being arranged in the housing (11) and located between the first liquid storage tank (12) and the second liquid storage tank (13), the control valve (2) being in communication with both the first liquid storage tank (12) and the second liquid storage tank (13), and the control valve (2) being opened when the driving gas in the first liquid storage tank (12) is discharged; A power generation device (3) and an electric storage element (4), wherein the power generation device (3) and the electric storage element (4) are electrically connected, the power generation device (3) is in communication with the control valve (2), and the power generation device (3) is suitable for being driven by the driving gas to generate electricity; The control valve (2) comprises a valve body (21) and a blocking rod (22); the valve body (21) defines a pivoting space (211); the valve body (21) is provided with an exhaust pipe (212) and a liquid infusion pipe (213); the exhaust pipe (212) and the liquid infusion pipe (213) are arranged spaced apart and are both in communication with the pivoting space (211); the exhaust pipe (212) is in communication between the first liquid storage tank (12) and the power generation equipment (3); and the liquid infusion pipe (213) is in communication between the second liquid storage tank (13) and the first liquid storage tank (12); The blocking rod (22) is pivotally connected to the housing (11); the blocking rod (22) is pivotally provided with a first blocking portion (221) and a second blocking portion (222); the first blocking portion (221) and the second blocking portion (222) are both located on the same side of the blocking rod (22); the first blocking portion (221) and the second blocking portion (222) are both suitable for rotating around the pivot axis of the blocking rod (22); the first blocking portion (221) and the exhaust pipe (21 2) is opposite to and is suitable for extending into the exhaust pipe (212) to block the exhaust pipe (212), the second blocking portion (222) is opposite to the infusion pipe (213) and is suitable for extending into the infusion pipe (213) to block the infusion pipe (213), the first blocking portion (221) is suitable for being driven by the driving gas to move away from the exhaust pipe (212), and the first blocking portion (221) drives the second blocking portion (222) to move away from the infusion pipe (213); The inner peripheral wall of the exhaust pipe (212) is provided with a first accommodating groove (2121), the first accommodating groove (2121) is provided with a first avoidance hole (2122) communicating with the pivoting space (211), the first blocking portion (221) passes through the first avoidance hole (2122) and extends into the exhaust pipe (212), the first blocking portion (221) is provided with a first stop portion (2211), the first stop portion (2211) is suitable for stop-matching with the bottom wall of the first accommodating groove (2121), and the first accommodating groove (2121) is used to accommodate the first blocking portion (221); The inner peripheral wall of the infusion tube (213) is provided with a second accommodating groove (2131), the second accommodating groove (2131) is provided with a second avoidance hole (2132) connected with the pivot space (211), the second blocking portion (222) passes through the second avoidance hole (2132) and extends into the infusion tube (213), the second blocking portion (222) is provided with a second stop portion (2221), the second stop portion (2221) is suitable for stop-fitting with the bottom wall of the second accommodating groove (2131), and the second accommodating groove (2131) is used to accommodate the second blocking portion (222).

2. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The inner circumferential wall of the first avoidance hole (2122) and the inner circumferential wall of the second avoidance hole (2132) are both provided with sealing members (2123), and the sealing members (2123) are sealedly matched with the first blocking portion (221) and the second blocking portion (222).

3. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: There are multiple blocking rods (22), multiple exhaust pipes (212) and multiple infusion pipes (213); the multiple blocking rods (22), multiple exhaust pipes (212) and multiple infusion pipes (213) are arranged at intervals along the first direction of the control valve (2); the multiple blocking rods (22), multiple exhaust pipes (212) and multiple infusion pipes (213) are arranged in a one-to-one correspondence.

4. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: Also includes: The control valve (2) further comprises a driving member (23), the driving member (23) being arranged in the pivoting space (211), the driving member (23) being in transmission connection with the blocking rod (22), the driving member (23) being used to drive the blocking rod (22) to drive the second blocking portion (222) to move away from the liquid infusion tube (213), the liquid level detection member (5) being arranged in the first liquid storage tank (12), the liquid level detection member (5) being used to detect the liquid level height of the evaporated liquid, the liquid level detection member (5) and the driving member (23) being both in communication connection with the controller, the controller being used to control the driving member (23) to operate according to a detection signal of the liquid level detection member (5).

5. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: Also includes: A flow divider (6), a plurality of heat exchange tubes (122), the plurality of heat exchange tubes (122) being arranged at intervals along the radial direction of the steam tank (1), the flow divider (6) being arranged on the outer peripheral wall of the shell (11), the flow divider (6) being provided with a liquid inlet (61) and a plurality of liquid outlets (62), the plurality of liquid outlets (62) being arranged in sequence at intervals along the radial direction of the flow divider (6), the plurality of heat exchange tubes (122) being arranged in one-to-one correspondence with the plurality of liquid outlets (62), the end of the heat exchange tube (122) away from the second liquid storage tank (13) being communicated with the liquid outlet (62), the liquid inlet (61) being communicated with the plurality of liquid outlets (62), and the liquid inlet (61) being used to receive the waste heat liquid.

6. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: An overflow pipe (132) is provided at the upper end of the second liquid storage tank (13) along the height direction of the steam tank (1); one end of the overflow pipe (132) is connected to the second liquid storage tank (13), and the other end passes through the shell (11); the waste heat liquid in the second liquid storage tank (13) is suitable for flowing out to the external environment through the overflow pipe (132).

7. A waste heat recovery device for a thermal power plant according to claim 1, characterized in that: A spiral track (111) is provided in the air supply gap (14), and the spiral track (111) is arranged around the outer peripheral wall of the first liquid storage tank (12) and the outer peripheral wall of the second liquid storage tank (13). The spiral track (111) abuts against the inner peripheral wall of the shell (11), the outer peripheral wall of the first liquid storage tank (12), and the outer peripheral wall of the second liquid storage tank (13). Along the height direction of the steam tank (1), one of the air inlet (15) and the air outlet (16) is located at the upper end of the shell (11), and the other is located at the lower end of the shell (11). The waste heat gas flows along the spiral track (111) to the air outlet (16).

8. The waste heat recovery device for a thermal power plant according to claim 1, characterized in that: The outer peripheral wall of the shell (11) is provided with a heat-insulating layer (17).

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