Power plant waste heat recovery device

Abstract

The invention provides a power plant waste heat recovery device, and relates to the technical field of waste heat recovery, the power plant waste heat recovery device comprises a supporting assembly, a waste heat recovery assembly, a hot water assembly and a water outlet assembly, the supporting assembly supports the waste heat recovery assembly, and the hot water inlet end of the waste heat recovery assembly is connected with the hot water assembly; and the heat-exchanged cold water outlet end of the waste heat recovery assembly is connected with the water outlet assembly. Cold water needing heat exchange is filled into the cold water space in the heat exchange disc body through the cold water pipe, the cold water and the hot water make full contact through the spiral winding space, heat exchange is conducted, the cold water obtained after heat exchange is guided out through the water outlet assembly, and after hot water in the heat exchange disc body at the upper end is exchanged, heat exchange is conducted. And heat is transferred into the water inlet plate of the next heat exchange disc body through the heat outlet pipe at the bottom, lower gradient cold water temperature heat exchange and multi-gradient hot water heat exchange are carried out in cooperation with the cold water pipe of the next heat exchange disc body, different heat exchange cold water temperature requirements are met, and the heat exchange part of the device is compact in structure and small in occupied size.

Description

Technical Field

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

[0002] A power plant is a power plant that converts some form of raw energy into electrical energy for fixed facilities or transportation, such as thermal, hydro, steam, diesel or nuclear power plants. Power plants generate a lot of waste heat when generating electricity, and by recovering the waste heat, the energy can be fully utilized.

[0003] However, the existing waste heat recovery devices of power plants mostly conduct heat exchange by introducing hot and cold fluids into the pipes. The overall volume is large, and the temperature of the water body after the heat exchange is not convenient for step temperature separation, which is not suitable for the requirements of various water body temperatures for heat exchange, and the use effect is not good. Therefore, in view of the above situation, it is urgent to develop a waste heat recovery device for power plants to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The present invention provides a waste heat recovery device for a power plant, which is used to solve the problem that the waste heat recovery device for a power plant proposed above mostly introduces hot and cold fluids into the inside and outside of the pipeline to perform hot and cold exchange, the overall volume is large, and the temperature of the water body exported after the hot and cold exchange is not convenient for step temperature separation, and it is not suitable for the requirements of various water body temperatures for heat exchange, and the use effect is not good.

[0005] In order to solve the above technical problems, the present invention discloses a waste heat recovery device for a power plant, comprising a support component, a waste heat recovery component, a hot water component and a water outlet component, wherein the support component supports the waste heat recovery component, the hot water inlet end of the waste heat recovery component is connected to the hot water component, and the cold water outlet end of the waste heat recovery component after heat exchange is connected to the water outlet component, the support component comprises a support base, the waste heat recovery component comprises a plurality of groups of disc-shaped heat exchange discs, the plurality of groups of heat exchange discs are vertically mounted on the support base, a plurality of support columns are bolted between the plurality of groups of heat exchange discs, a spiral spiral spacer is welded inside the heat exchange disc, the spiral spacer divides the heat exchange disc into two spiral independent spaces, the two ends of the heat exchange disc are respectively connected to a water inlet plate and a water outlet plate, the middle part of the heat exchange disc is connected to a heat outlet pipe and a cold water pipe, the heat outlet pipe of the upper heat exchange disc is connected to the water inlet plate of the lower heat exchange disc, the water inlet plate of the upper heat exchange disc is connected to the hot water component, and the water outlet end of the water outlet plate is connected to the water outlet component.

[0006] As a further solution of the present invention: a plurality of limit columns are welded to the upper end of the support assembly, the upper ends of the limit columns are bolted to a top plate, the bottom of the top plate is connected to an elastic plate, and the elastic plate contacts the heat exchange disk body at the upper end.

[0007] As a further solution of the present invention: the outer walls of the plurality of heat exchange discs are connected with a heat preservation plate, and the heat preservation plate is arc-shaped.

[0008] As a further solution of the present invention: the hot water assembly includes a support plate and a water inlet pump, a hollow temporary storage box is installed on the upper end of the support plate, a hot water pipe is connected to one side of the temporary storage box, the bottom of the temporary storage box is connected to the water inlet pump, and the water outlet end of the water inlet pump is connected to the water inlet plate of the upper heat exchange disk through a pipe.

[0009] As a further solution of the present invention: the upper end of the temporary storage box is bolted to a sealing plate, and a sealing ring is connected between the sealing plate and the temporary storage box.

[0010] As a further solution of the present invention: a deflection plate is fixedly welded inside the temporary storage box, the deflection plate is arranged on one side of the hot water pipe, and the deflection plate is arc-shaped.

[0011] As a further solution of the present invention: a plurality of transverse baffles are fixedly welded to one side of the interior of the temporary storage box, and the plurality of transverse baffles are equidistantly arranged in the temporary storage box.

[0012] As a further solution of the present invention: the water outlet assembly includes multiple groups of water collecting boxes, one side of the water collecting boxes is connected to a water outlet pump, multiple groups of water outlet plates of the heat exchange disk are connected to the water collecting boxes, and one side of the water collecting boxes is connected to a perspective window and a thermometer.

[0013] As a further solution of the present invention: the water outlet pump also includes:

[0014] Water pressure sensor 1, used to detect the pressure at the outlet of the water pump;

[0015] Water pressure sensor 2, used to detect the pressure at the inlet of the water pump;

[0016] An alarm and a controller are electrically connected to the first water pressure sensor and the second water pressure sensor.

[0017] As a further solution of the present invention: the controller controls the alarm to work based on the water pressure sensor 1 and the water pressure sensor 2, comprising the following steps:

[0018] Step 1: According to formula (1), the detection values ​​of water pressure sensor 1 and water pressure sensor 2, calculate the actual output total pressure F of the water pump:

[0019]

[0020] Where P C is the detection value of the water pressure sensor, P X is the detection value of water pressure sensor 2, ρ is the density of water in the water collection tank, g is the acceleration of gravity, S Cis the cross-sectional area of ​​the pipe at the outlet of the water pump, S X is the cross-sectional area of ​​the pipe at the inlet of the water pump, Q is the actual flow rate of water passing through the cross-sectional area at the outlet of the water pump per unit time, H is the actual head of the water pump, L C is the length of the connecting pipe at the outlet of the water pump, L X is the length of the connecting pipe at the inlet of the water pump;

[0021] Step 2: According to the following formula (2), the actual output power W of the water pump is calculated. The controller compares the actual output power W of the water pump with the preset output power range. When the actual output power is lower than the preset output power range, the controller controls the alarm to sound an alarm:

[0022]

[0023] Among them, H L is the theoretical head of the outlet pump, Q L is the theoretical flow rate of the outlet pump, N is the total power transmitted to the water by the impeller in the outlet pump, N Z is the shaft power of the outlet pump, e is the base of the natural logarithm, α is the head coefficient of the outlet pump, and β is the flow coefficient of the outlet pump.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the present invention, the cold water to be exchanged is filled into the cold water space inside the heat exchange disc through the cold water pipe. The spirally wound space allows the cold and hot water to fully contact each other and perform heat exchange. The cold water after the heat exchange is discharged through the water outlet assembly. After the hot water inside the upper heat exchange disc is exchanged, it is transferred to the water inlet plate of the next group of heat exchange discs through the heat outlet pipe at the bottom, and cooperates with the cold water pipe of the next group to perform the lower gradient cold water temperature heat exchange, and perform multi-gradient hot water heat exchange, which is suitable for different heat exchange cold water temperature requirements, and the heat exchange components of the device are compact in structure and occupy a small volume.

[0026] 2. In the present invention, the hot water introduced by the hot water pipe on one side is temporarily stored by a temporary storage box, which is convenient for the water inlet pump to extract liquid. The hot water is introduced by the water inlet pump at the bottom. The hot water inside the temporary storage box controls the water inlet speed through the water inlet pump speed, thereby controlling the heat exchange time with the cold water and adjusting the temperature of the cold water after heat exchange in different sections. The water collecting tank concentrates the cold water after heat exchange, which is convenient for the water outlet pump to extract liquid, and the cold water after heat exchange is discharged by the water outlet pump. The circulation rate of the heat exchange cold water is controlled by controlling the water outlet pump speed, and the temperature of the heat exchange cold water is accurately controlled in combination with the hot water that controls the flow rate, and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a three-dimensional structure provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of an overall explosion structure provided by an embodiment of the present invention;

[0030] Figure 3 The embodiment of the present invention provides Figure 2 The enlarged structural diagram at A in the middle;

[0031] Figure 4 A schematic diagram of a rear-view stereoscopic structure provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of a side view structure provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the heat exchange disc structure provided in an embodiment of the present invention;

[0034] Figure 7 A bottom-up schematic diagram of the three-dimensional structure of a heat exchange disk provided in an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the top view of the heat exchange disk provided in an embodiment of the present invention.

[0036] In the figure: 1. Support assembly; 101. Support base; 102. Limit column; 103. Top plate; 104. Elastic plate; 105. Support column; 2. Waste heat recovery assembly; 201. Heat exchange disc; 202. Spiral spacer; 203. Water inlet plate; 204. Heat outlet pipe; 205. Cold water pipe; 206. Water outlet plate; 207. Insulation plate; 3. Hot water assembly; 301. Support plate; 302. Temporary storage box; 303. Sealing plate; 304. Hot water pipe; 305. Steering plate; 306. Horizontal baffle; 307. Water inlet pump; 4. Water outlet assembly; 401. Water collecting tank; 402. Water outlet pump; 403. Perspective window; 404. Thermometer. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The present invention provides the following embodiments

[0040] Example 1

[0041] See also Figure 1-Figure 8In an embodiment of the present invention, a waste heat recovery device for a power plant includes a support component 1, a waste heat recovery component 2, a hot water component 3 and a water outlet component 4. The support component 1 supports the waste heat recovery component 2. The hot water inlet of the waste heat recovery component 2 is connected to the hot water component 3. The cold water outlet of the waste heat recovery component 2 after heat exchange is connected to the water outlet component 4. The support component 1 includes a support base 101. The waste heat recovery component 2 includes a plurality of groups of disc-shaped heat exchange discs 201. The plurality of groups of heat exchange discs 201 are vertically mounted on the support base 101. The plurality of groups of heat exchange discs 201 are screwed together. The bolts are connected with a plurality of support columns 105, and a spiral spacer 202 is welded inside the heat exchange disk 201. The spiral spacer 202 divides the heat exchange disk 201 into two spiral independent spaces. The two ends of the heat exchange disk 201 are respectively connected with a water inlet plate 203 and a water outlet plate 206. The middle of the heat exchange disk 201 is connected with a heat outlet pipe 204 and a cold water pipe 205. The heat outlet pipe 204 of the upper heat exchange disk 201 is connected to the water inlet plate 203 of the lower heat exchange disk 201. The water inlet plate 203 of the upper heat exchange disk 201 is connected to the hot water assembly 3, and the water outlet plate 206 is connected to the hot water assembly 3. The water outlet of 06 is connected to the water outlet component 4, and multiple heat exchange discs 201 are vertically stacked and installed through the support base 101 of the support component 1. Multiple heat exchange discs 201 are supported by multiple support columns 105 to form a spacing space. The hot water component 3 guides the waste hot water generated by the power generation equipment of the power plant into the water inlet plate 203 on one side of the upper heat exchange disc 201. The spiral partition 202 inside the heat exchange disc 201 divides the internal space into two spaces. Hot water fills the hot water space inside the heat exchange disc 201, and the cold water pipe 205 fills the cold water that needs to be heat exchanged. The cold water space inside the heat exchange disc 201 is entered, and the space spirally entangled with each other allows the cold and hot water to fully contact each other for heat exchange. The cold water after the heat exchange is discharged through the water outlet component 4. After the hot water inside the upper heat exchange disc 201 is exchanged, it is transferred to the water inlet plate 203 of the next group of heat exchange discs 201 through the heat outlet pipe 204 at the bottom, and cooperates with the cold water pipe 205 of the next group to perform the lower gradient cold water temperature heat exchange, and perform multi-gradient hot water heat exchange, which is suitable for different heat exchange cold water temperature requirements. The heat exchange components of the device have a compact structure, occupy a small volume, and are easy to install and operate.

[0042] Preferably, Figure 1 As shown, a plurality of limit columns 102 are welded to the upper end of the support assembly 1, and the upper end of the limit columns 102 is bolted to a top plate 103. The multi-layer stacked heat exchange disk bodies 201 are limited by the plurality of limit columns 102, and the top plate 103 at the upper end is firmly connected, making the overall installation of the device more stable.

[0043] Preferably, Figure 1As shown, an elastic plate 104 is connected to the bottom of the top plate 103, and the elastic plate 104 contacts and connects the upper heat exchange disk body 201. The elastic plate 104 at the bottom of the top plate 103 elastically contacts and connects the upper heat exchange disk body 201, thereby preventing the top plate 103 from directly contacting and pressing the upper heat exchange disk body 201.

[0044] Preferably, Figure 2 As shown, the outer walls of the plurality of heat exchange disks 201 are connected with insulation plates 207 , which are arc-shaped. The heat exchange disks 201 are annularly connected and insulated by the annular insulation plates 207 to avoid rapid heat loss.

[0045] Preferably, Figure 2 As shown, the hot water component 3 includes a support plate 301 and a water inlet pump 307. A hollow temporary storage box 302 is installed on the upper end of the support plate 301. A hot water pipe 304 is connected to one side of the temporary storage box 302. The bottom of the temporary storage box 302 is connected to the water inlet pump 307. The water outlet of the water inlet pump 307 is connected to the water inlet plate 203 of the upper heat exchange disk 201 through a pipeline. The support plate 301 is installed and connected to the support member. The temporary storage box 302 is supported and connected by the support plate 301. The temporary storage box 302 temporarily stores the hot water introduced by the hot water pipe 304 on one side, which is convenient for the water inlet pump 307 to extract liquid. Hot water is introduced through the water inlet pump 307 at the bottom. The hot water inside the temporary storage box 302 controls the water inlet speed through the rotation speed of the water inlet pump 307, thereby controlling the heat exchange time with the cold water and adjusting the temperature after the heat exchange of cold water in different sections.

[0046] Preferably, Figure 2 As shown, the upper end of the temporary storage box 302 is bolted to a sealing plate 303, and a sealing ring is connected between the sealing plate 303 and the temporary storage box 302. The temporary storage box 302 with an upper opening is sealed by the sealing plate 303, and the exhaust hole opened on the sealing plate 303 is convenient for exhausting air, thereby ensuring the overall sealing of the device and avoiding rapid heat loss.

[0047] Preferably, Figure 2 As shown, a deflection plate 305 is fixedly welded inside the temporary storage box 302. The deflection plate 305 is arranged on one side of the hot water pipe 304. The deflection plate 305 is arc-shaped. The hot water introduced into the hot water pipe 304 is deflected by the arc-shaped deflection plate 305 to prevent the fast-flowing hot water from generating large turbulence and causing the bottom water inlet pump 307 to inhale air.

[0048] Preferably, Figure 2 As shown, a plurality of transverse baffles 306 are fixedly welded to one side of the interior of the temporary storage box 302, and the plurality of transverse baffles 306 are equidistantly arranged in the temporary storage box 302. The plurality of transverse baffles 306 in the temporary storage box 302 block the water body, thereby effectively reducing foam.

[0049] Preferably, Figure 4 As shown, the water outlet component 4 includes multiple groups of water collecting tanks 401, one side of the water collecting tank 401 is connected to a water outlet pump 402, and the water outlet plates 206 of the multiple groups of heat exchange disc bodies 201 are all connected to the water collecting tank 401. The water collecting tank 401 collects the cold water after heat exchange, which is convenient for the water outlet pump 402 to extract liquid, and the cold water after heat exchange is discharged through the water outlet pump 402. By controlling the rotation speed of the water outlet pump 402, the circulation rate of the heat exchange cold water is controlled, and the temperature of the heat exchange cold water is accurately controlled in conjunction with the hot water that controls the flow rate, and the operation is convenient.

[0050] Preferably, Figure 3 As shown, a perspective window 403 and a thermometer 404 are connected to one side of the water collecting tank 401, and the perspective window 403 and the thermometer 404 on one side of the water collecting tank 401 are used for water level observation and temperature display respectively.

[0051] The working principle of the present invention is as follows: the electrical equipment of the device is connected to an external power supply, the support base 101 of the support assembly 1 is vertically stacked on multiple heat exchange discs 201, and multiple heat exchange discs 201 are supported by multiple support columns 105 to form a separation space, the hot water assembly 3 guides the waste hot water generated by the power generation equipment of the power plant into the water inlet plate 203 on one side of the upper heat exchange disc 201, the spiral baffle 202 inside the heat exchange disc 201 divides the internal space into two spaces, hot water fills the hot water space inside the heat exchange disc 201, and the cold water pipe 205 fills the hot water space required for heat exchange The cold water is filled into the cold water space inside the heat exchange disc 201, and the space spirally entangled with each other allows the cold and hot water to fully contact each other for heat exchange. The cold water after the heat exchange is discharged through the water outlet component 4. After the hot water inside the upper heat exchange disc 201 is exchanged, it is transferred to the water inlet plate 203 of the next group of heat exchange discs 201 through the heat outlet pipe 204 at the bottom, and cooperates with the cold water pipe 205 of the next group to perform the lower gradient cold water temperature heat exchange, and perform multi-gradient hot water heat exchange, which is suitable for different heat exchange cold water temperature requirements. The heat exchange components of the device have a compact structure, occupy a small volume, and are easy to install and operate.

[0052] Example 2

[0053] Based on Example 1, the water outlet pump 402 further includes:

[0054] Water pressure sensor 1, used to detect the pressure at the outlet of the water pump 402;

[0055] Water pressure sensor 2, used to detect the pressure at the inlet of the water pump 402;

[0056] An alarm and a controller are electrically connected to the first water pressure sensor and the second water pressure sensor.

[0057] Preferably, the controller controls the alarm to work based on the water pressure sensor 1 and the water pressure sensor 2, comprising the following steps:

[0058] Step 1: According to formula (1), the detection values ​​of water pressure sensor 1 and water pressure sensor 2, calculate the actual output total pressure F of the water pump 402:

[0059]

[0060] Where P C is the detection value of the water pressure sensor, P X is the detection value of the water pressure sensor 2, ρ is the density of water in the water collecting tank 401, g is the acceleration of gravity, S C is the cross-sectional area of ​​the pipe at the outlet of the water pump 402, S X is the cross-sectional area of ​​the pipe at the inlet of the outlet pump 402, Q is the actual flow rate of water passing through the cross-sectional area at the outlet of the outlet pump 402 per unit time, H is the actual head of the outlet pump 402, L C is the length of the connecting pipe at the outlet of the water pump 402, L X is the length of the connecting pipe at the inlet of the water outlet pump 402;

[0061] Step 2: According to the following formula (2), the actual output power W of the water outlet pump 402 is calculated. The controller compares the actual output power W of the water outlet pump 402 with the preset output power range. When the actual output power is lower than the preset output power range, the controller controls the alarm to sound an alarm:

[0062]

[0063] Among them, H L is the theoretical head of the outlet pump 402, Q L is the theoretical flow rate of the outlet pump 402, N is the total power transmitted to the water by the impeller in the outlet pump 402, N Z is the shaft power of the outlet pump 402, e is the base of the natural logarithm, α is the head coefficient of the outlet pump 402 (the value is 0.5), β is the flow coefficient of the outlet pump 402 (the value is 0.15), where represents the hydraulic efficiency of the water pump 402, Indicates the volumetric efficiency of the water pump 402, It represents the mechanical efficiency of the water pump 402.

[0064] The beneficial effects of the above technical solution are as follows: the controller calculates the actual output total pressure of the water outlet pump 402 based on the detection values ​​of the water pressure sensor 1 and the water pressure sensor 2 according to the formula (1), and comprehensively considers the density of water in the water collecting tank 401, the acceleration of gravity, the cross-sectional area of ​​the pipe at the outlet of the water outlet pump 402, the cross-sectional area of ​​the pipe at the inlet of the water outlet pump 402, the actual flow rate of water passing through the cross-sectional area at the outlet of the water outlet pump 402 per unit time, the actual head of the water outlet pump 402, the length of the connecting pipe at the outlet of the water outlet pump 402, and the length of the connecting pipe at the inlet of the water outlet pump 402, so that the calculation result is more accurate and reliable;

[0065] Then, according to formula (2) and the theoretical head of the water outlet pump 402, the theoretical flow rate of the water outlet pump 402, the total power transmitted to the water by the impeller in the water outlet pump 402, the shaft power of the water outlet pump 402, the head coefficient of the water outlet pump 402, and the flow coefficient of the water outlet pump 402, the actual output power of the water outlet pump 402 is calculated, so that the calculation result is more accurate and reliable.

[0066] The controller controls the operation of the alarm based on water pressure sensor 1 and water pressure sensor 2. The controller compares the actual output power of the water outlet pump 402 with the preset output power range. When the actual output power is lower than the preset output power range, the controller controls the alarm to sound, reminding the staff to promptly inspect or replace the water outlet pump 402 so that it can operate normally, thereby meeting the user's needs for this type of power plant waste heat recovery device.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recovery device for a power plant, comprising a support component (1), a waste heat recovery component (2), a hot water component (3) and a water outlet component (4), wherein the support component (1) supports the waste heat recovery component (2), the hot water inlet of the waste heat recovery component (2) is connected to the hot water component (3), and the cold water outlet after heat exchange of the waste heat recovery component (2) is connected to the water outlet component (4), characterized in that: The support assembly (1) comprises a support base (101), and the waste heat recovery assembly (2) comprises a plurality of groups of disc-shaped heat exchange disc bodies (201), wherein the plurality of groups of heat exchange disc bodies (201) are vertically mounted on the support base (101), and a plurality of support columns (105) are bolted between the plurality of groups of heat exchange disc bodies (201), and a spiral spacer (202) is welded inside the heat exchange disc body (201), and the spiral spacer (202) divides the heat exchange disc body (201) into two spiral independent spaces, The two ends of the heat exchange disc (201) are respectively connected to a water inlet plate (203) and a water outlet plate (206); the middle of the heat exchange disc (201) is connected to a heat outlet pipe (204) and a cold water pipe (205); the heat outlet pipe (204) of the upper heat exchange disc (201) is connected to the water inlet plate (203) of the lower heat exchange disc (201); the water inlet plate (203) of the upper heat exchange disc (201) is connected to a hot water component (3); and the water outlet end of the water outlet plate (206) is connected to a water outlet component (4).

2. A power plant waste heat recovery device according to claim 1, characterized in that: A plurality of limiting columns (102) are welded to the upper end of the support assembly (1); the upper ends of the limiting columns (102) are bolted to a top plate (103); the bottom of the top plate (103) is connected to an elastic plate (104); and the elastic plate (104) contacts the heat exchange disk (201) connected to the upper end.

3. The power plant waste heat recovery device according to claim 1, characterized in that: The outer walls of the plurality of heat exchange disc bodies (201) are connected to a heat insulation plate (207), and the heat insulation plate (207) is arc-shaped.

4. The power plant waste heat recovery device according to claim 1, characterized in that: The hot water component (3) comprises a support plate (301) and a water inlet pump (307); a hollow temporary storage box (302) is installed on the upper end of the support plate (301); a hot water pipe (304) is connected to one side of the temporary storage box (302); a water inlet pump (307) is connected to the bottom of the temporary storage box (302); and a water outlet end of the water inlet pump (307) is connected to the water inlet plate (203) of the upper heat exchange disk (201) through a pipeline.

5. A power plant waste heat recovery device according to claim 4, characterized in that: The upper end of the temporary storage box (302) is bolted to a sealing plate (303), and a sealing ring is connected between the sealing plate (303) and the temporary storage box (302).

6. A power plant waste heat recovery device according to claim 4, characterized in that: A deflection plate (305) is fixedly welded inside the temporary storage box (302), and the deflection plate (305) is arranged on one side of the hot water pipe (304), and the deflection plate (305) is arc-shaped.

7. The power plant waste heat recovery device according to claim 4, characterized in that: A plurality of transverse baffles (306) are fixedly welded to one side of the interior of the temporary storage box (302), and the plurality of transverse baffles (306) are arranged at equal intervals inside the temporary storage box (302).

8. The power plant waste heat recovery device according to claim 4, characterized in that: The water outlet assembly (4) comprises a plurality of water collecting boxes (401), one side of the water collecting boxes (401) is connected to a water outlet pump (402), a plurality of water outlet plates (206) of the heat exchange disk bodies (201) are connected to the water collecting boxes (401), and one side of the water collecting boxes (401) is connected to a perspective window (403) and a thermometer (404).

9. A power plant waste heat recovery device according to claim 8, characterized in that: The water outlet pump (402) further comprises: A water pressure sensor 1, used to detect the pressure at the outlet of the water pump (402); A second water pressure sensor, used to detect the pressure at the inlet of the water pump (402); An alarm and a controller are electrically connected to the first water pressure sensor and the second water pressure sensor.

10. A power plant waste heat recovery device according to claim 9, characterized in that: The controller controls the alarm to work based on the water pressure sensor 1 and the water pressure sensor 2, including the following steps: Step 1: According to formula (1), the detection values ​​of water pressure sensor 1 and water pressure sensor 2, calculate the actual output total pressure F of the water outlet pump (402): Where P C is the detection value of the water pressure sensor, P X is the detection value of the water pressure sensor 2, ρ is the density of water in the water collecting tank (401), g is the acceleration of gravity, S C is the cross-sectional area of ​​the pipe at the outlet of the water pump (402), S X is the cross-sectional area of ​​the pipe at the inlet of the outlet pump (402), Q is the actual flow rate of water passing through the cross-sectional area at the outlet of the outlet pump (402) per unit time, H is the actual head of the outlet pump (402), L C is the length of the connecting pipe at the outlet of the water pump (402), L X is the length of the connecting pipe at the inlet of the water outlet pump (402); Step 2: According to the following formula (2), the actual output power W of the water outlet pump (402) is calculated. The controller compares the actual output power W of the water outlet pump (402) with the preset output power range. When the actual output power is lower than the preset output power range, the controller controls the alarm to sound an alarm: Among them, H L is the theoretical head of the outlet pump (402), Q L is the theoretical flow rate of the outlet pump (402), N is the total power transmitted to the water by the impeller in the outlet pump (402), N Z is the shaft power of the water outlet pump (402), e is the base of the natural logarithm, α is the head coefficient of the water outlet pump (402), and β is the flow coefficient of the water outlet pump (402).

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