Desulfurization slurry waste heat recovery system based on flash evaporation

Abstract

The utility model relates to the technical field of energy conservation, and discloses a desulfurization slurry waste heat recovery system based on flash evaporation, which comprises a concrete bottom plate, a U-shaped pipe, an absorption heat pump component and a water ring vacuum component, a waste heat recovery mechanism, a connecting assembly, a U-shaped pipe, an absorption heat pump assembly and a water ring vacuum assembly are sequentially installed on the same side face of the concrete bottom plate from left to right, and the waste heat recovery mechanism enables negative pressure water vapor generated through flash evaporation to upwards pass through the connecting assembly so as to remove tiny desulfurization slurry liquid drops carried in the water vapor. According to the desulfurization slurry waste heat recovery system based on flash evaporation, waste heat recovery is carried out in a flash evaporation mode, compared with a traditional dividing wall type heat exchange device, flashed negative pressure water vapor is pure, the corrosivity is far lower than that of desulfurization slurry, meanwhile, the problems of blockage and abrasion cannot occur in heat exchange of the negative pressure water vapor, and the service life of the system is prolonged. And the efficiency of vapor-liquid heat exchange is higher than that of liquid-liquid heat exchange, so that the use effect of the existing desulfurization slurry waste heat recovery device is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy conservation, in particular to a desulfurization slurry waste heat recovery system based on flash evaporation. Background Art

[0002] As the main energy-consuming equipment in China, large-scale power station boilers and medium-sized industrial boilers have a thermal efficiency of over 90%, and most of the 10% loss is exhaust heat loss. With the improvement of environmental protection requirements, more than 90% of domestic boilers use wet processes such as limestone or gypsum for flue gas desulfurization. The exhaust heat loss is transferred to the desulfurization slurry. Therefore, the recovery of the waste heat of the desulfurization slurry is the recovery of the waste heat of the boiler exhaust.

[0003] Compared with traditional boiler flue gas waste heat recovery technologies, such as low-pressure economizer technology and heat pipe technology, there are problems such as low-temperature acid dew corrosion, wear, and blockage, and it can only recover waste heat equivalent to 1-3% of the boiler load. At the same time, with the extension of operating time, the heat exchange tubes arranged in front of the dust collector will be worn and leaked on a large scale after about four years, which is quite different from the service life of the boiler, resulting in the use effect of the existing desulfurization slurry waste heat recovery device needs to be improved. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the utility model provides a desulfurization slurry waste heat recovery system based on flash evaporation, which has the advantages of effectively improving the use effect of the existing desulfurization slurry waste heat recovery device, and solves the problem of poor use effect of the existing desulfurization slurry waste heat recovery device.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of effectively improving the use effect of the existing desulfurization slurry waste heat recovery device, the utility model provides the following technical solutions: a desulfurization slurry waste heat recovery system based on flash evaporation, including a concrete base plate, a U-shaped tube, an absorption heat pump component and a water ring vacuum component, and a waste heat recovery mechanism, a connecting component, a U-shaped tube, an absorption heat pump component and a water ring vacuum component are installed on the same side of the concrete base plate from left to right in sequence, the waste heat recovery mechanism passes the negative pressure water vapor generated by flash evaporation upward through the connecting component to remove tiny desulfurization slurry droplets carried in the water vapor, and the waste heat recovery mechanism recycles the desulfurization slurry after cooling in the waste heat recovery mechanism, the connecting component is connected to the water ring vacuum component, and the exhaust condensate generated after the negative pressure water vapor of the water ring vacuum component is condensed as a water source to clean the connecting component, the connecting component is connected to the absorption heat pump component through the U-shaped tube, and the absorption heat pump component is used to recover the waste heat in the negative pressure steam to heat the heating water or the cold source;

[0008] The waste heat recovery mechanism includes an original desulfurization tower fixedly installed on one side of the concrete bottom plate and a high-temperature flue gas inlet pipe fixedly installed on one side of the original desulfurization tower for injecting high-temperature flue gas, an infusion component is installed on the other side of the original desulfurization tower, a flash tank is installed at one end of the infusion component, and evenly distributed supporting feet are fixedly installed on the outer surface of the flash tank and on the side close to the concrete bottom plate. A return liquid component that penetrates and is connected to the original desulfurization tower is installed on the side of the flash tank close to the concrete bottom plate, a No. 1 spray component located in the original desulfurization tower is installed on one side of the return liquid component, and a high-temperature flue gas inlet pipe is installed between the infusion component and the return liquid component.

[0009] Furthermore, the infusion assembly includes a No. 1 infusion tube, a No. 1 electric control valve and a No. 2 infusion tube; one end of the No. 1 infusion tube is fixedly installed on one side of the original desulfurization tower through a flange, and the other end is fixedly installed on one side of the No. 1 electric control valve through a flange; one end of the No. 2 infusion tube is fixedly installed on one side of the No. 1 electric control valve through a flange, and the other end is fixedly installed on one side of the flash tank through a flange.

[0010] Furthermore, the liquid return assembly includes a No. 1 liquid return pipe, a deslurry pump, a No. 2 liquid return pipe, a No. 3 liquid return pipe, a No. 2 electric control valve and a No. 4 liquid return pipe; one end of the No. 1 liquid return pipe is fixedly connected to a side of the flash tank close to the concrete bottom plate, and the other end is fixedly installed on a side of the deslurry pump, and the deslurry pump is fixedly installed on one side of the concrete bottom plate, one end of the No. 2 liquid return pipe is fixedly connected to one side of the deslurry pump, and the other end is fixedly connected to one side of the No. 2 liquid infusion pipe, one end of the No. 3 liquid return pipe is fixedly connected to one side of the No. 2 liquid infusion pipe, and the other end is fixedly connected to one side of the No. 2 electric control valve, the No. 2 liquid return pipe is connected to the No. 2 electric control valve through the No. 3 liquid return pipe, one end of the No. 4 liquid return pipe is fixedly connected to the other side of the No. 2 electric control valve, and the other end is fixedly connected to one side of the original desulfurization tower.

[0011] Furthermore, the sum of the heights of the support legs and the flash tank is greater than the height of the original desulfurization tower.

[0012] Furthermore, the No. 2 infusion tube is composed of an L-shaped tube and a direct current tube, one end of the L-shaped tube is fixedly connected to one side of the No. 1 electric control valve, and the other end is fixedly connected to the direct current tube, and the other end of the direct current tube is fixedly installed on the flash tank through a flange; the projection of the direct current tube in a first direction with the flash tank is an angle less than °, and the first direction is perpendicular to the plane direction of the flash tank.

[0013] Furthermore, the No. 1 spray assembly includes a spray pipe and a No. 1 nozzle; one end of the spray pipe is fixedly connected to one end of the No. 4 liquid return pipe, and the other end is fixedly connected to the inner wall of the original desulfurization tower.

[0014] Furthermore, the absorption heat pump assembly includes a lithium bromide absorption heat pump, a driving steam pipeline and a drain tank; one side of the lithium bromide absorption heat pump is fixedly installed on one side of the concrete base plate, the driving steam pipeline is fixedly installed on one side of the lithium bromide absorption heat pump, and the drain tank is fixedly installed on one side of the lithium bromide absorption heat pump.

[0015] Furthermore, the water ring vacuum assembly includes a vacuum tank, a water ring vacuum pump, a connecting pipe, a waste steam condensate feeding pipe and a No. 2 spray assembly; the vacuum tank is fixedly installed on a side of the water ring vacuum pump away from the concrete bottom plate, one end of the connecting pipe is fixedly connected to one side of the water ring vacuum pump, and the other end passes through the vacuum tank and is fixedly connected to the vacuum tank, one end of the waste steam condensate feeding pipe is fixedly connected to a side of the vacuum tank close to the concrete bottom plate, and the other end is connected to one side of the No. 2 spray assembly; the No. 2 spray assembly includes a connecting pipe and a No. 2 nozzle; one end of the connecting pipe is fixedly connected to one end of the waste steam condensate feeding pipe.

[0016] Furthermore, the connecting assembly includes a fixed shell, a corrugated plate demister and a funnel-shaped connecting cover; one side of the fixed shell is fixedly connected to one side of the flash tank, and the other side is fixedly connected to one side of the funnel-shaped connecting cover, the other side of the funnel-shaped connecting cover is fixedly connected to the U-shaped tube, and the corrugated plate demister is fixedly installed in the fixed shell.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model provides a desulfurization slurry waste heat recovery system based on flash evaporation, which has the following beneficial effects:

[0019] The desulfurization slurry waste heat recovery system based on flash evaporation recovers waste heat by means of flash evaporation through the coordination of the waste heat recovery mechanism, U-tube, absorption heat pump assembly, water ring vacuum assembly and connecting assembly on the concrete bottom plate. Compared with the traditional partition-type heat exchange device, the negative pressure water vapor generated by flash evaporation is relatively pure and its corrosiveness is far lower than that of the desulfurization slurry. At the same time, the heat exchange of negative pressure water vapor will not cause blockage and wear problems, and the efficiency of vapor-liquid heat exchange is also higher than that of liquid-liquid heat exchange. By recovering the waste heat of the desulfurization slurry by flash evaporation, 7% to 8% of the waste heat of the boiler load can be recovered, which is far higher than the existing flue gas waste heat recovery technology, thereby effectively improving the use effect of the existing desulfurization slurry waste heat recovery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram of the middle A part;

[0022] Figure 3 for Figure 1 A partial enlarged schematic diagram of the middle B part;

[0023] Figure 4 for Figure 3 3D schematic diagram of the water ring vacuum pump connection structure.

[0024] In the figure: 1 concrete bottom plate, 200 waste heat recovery mechanism, 201 original desulfurization tower, 2021 No. 1 infusion pipe, 2022 No. 1 electric control valve, 2023 No. 2 infusion pipe, 203 flash tank, 2041 No. 1 return pipe, 2042 deslurry pump, 2043 No. 2 return pipe, 2044 No. 3 return pipe, 2045 No. 2 electric control valve, 2046 No. 4 return pipe, 2051 spray pipe, 2052 No. 1 nozzle, 206 main electric control valve, 20 7 legs, 208 high-temperature flue gas inlet pipe, 3U-shaped pipe, 400 absorption heat pump assembly, 401 lithium bromide absorption heat pump, 402 driving steam pipeline, 403 drain tank, 500 water ring vacuum assembly, 501 vacuum tank, 502 water ring vacuum pump, 503 connecting pipe, 504 exhaust steam condensate replenishment pipe, 5051 connecting pipe, 5052 No. 2 nozzle, 600 connecting assembly, 601 fixed shell, 602 corrugated plate demister, 603 funnel-shaped connecting cover. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-4The utility model provides a technical solution: a desulfurization slurry waste heat recovery system based on flash evaporation, comprising a concrete bottom plate 1, a U-shaped tube 3, an absorption heat pump assembly 400 and a water ring vacuum assembly 500, a waste heat recovery mechanism 200, a connecting assembly 600, a U-shaped tube 3, an absorption heat pump assembly 400 and a water ring vacuum assembly 500 are sequentially installed on the same side of the concrete bottom plate 1 from left to right, the waste heat recovery mechanism 200 passes the negative pressure water vapor generated by flash evaporation upward through the connecting assembly 600 to remove the tiny desulfurization slurry droplets carried in the water vapor, and the waste heat recovery mechanism 200 and the desulfurization slurry after cooling is recycled in the waste heat recovery mechanism 200, the connection component 600 is connected to the water ring vacuum component 500, and the exhaust condensate generated after the negative pressure water vapor of the water ring vacuum component 500 is condensed as a water source to clean the connection component 600. While cleaning the corrugated plate, the concentration of the desulfurization slurry can be adjusted to prevent the concentration of the desulfurization slurry from increasing and forming deposition after flash evaporation. The connection component 600 is connected to the absorption heat pump component 400 through the U-shaped tube 3, and the absorption heat pump component 400 is used to recover the waste heat in the negative pressure steam to heat the heating water or cold source;

[0027] Through the coordination of the waste heat recovery mechanism 200, the U-shaped tube 3, the absorption heat pump assembly 400, the water ring vacuum assembly 500 and the connecting assembly 600 on the concrete base plate 1, the waste heat is recovered by flash evaporation. Compared with the traditional partition-type heat exchange device, the negative pressure water vapor flashed out is relatively pure and its corrosiveness is much lower than that of the desulfurization slurry. At the same time, the heat exchange of the negative pressure water vapor will not have problems of blockage and wear, and the efficiency of the vapor-liquid heat exchange is also higher than that of the liquid-liquid heat exchange. By recovering the waste heat of the desulfurization slurry by flash evaporation, 7% to 8% of the waste heat of the boiler load can be recovered, which is much higher than the existing flue gas waste heat recovery technology, thereby effectively improving the use effect of the existing desulfurization slurry waste heat recovery device.

[0028] In this embodiment, the waste heat recovery mechanism 200 is a structure for improving the flash evaporation efficiency.

[0029] like Figure 1 and Figure 2As shown, the waste heat recovery mechanism 200 includes an original desulfurization tower 201 fixedly mounted on one side of a concrete bottom plate 1 and a high-temperature flue gas inlet pipe 208 fixedly mounted on one side of the original desulfurization tower 201 for injecting high-temperature flue gas. An infusion component is installed on the other side of the original desulfurization tower 201, and a flash tank 203 is installed at one end of the infusion component. The vacuum degree in the flash tank 203 is 92 kPa. Evenly distributed legs 207 are fixedly mounted on the outer surface of the flash tank 203 and on one side close to the concrete bottom plate 1. The sides close to the concrete bottom plate 1 are all fixedly mounted on the concrete bottom plate 1. Multiple legs 207 are fixedly mounted on the sides close to the concrete bottom plate 1. A liquid return component penetrating and connected to the original desulfurization tower 201 is installed on the side of the flash tank 203 close to the concrete bottom plate 1. A No. 1 spray component located in the original desulfurization tower 201 is installed on one side of the liquid return component. A high-temperature flue gas inlet pipe 208 is installed between the infusion component and the liquid return component.

[0030] It should be noted that the infusion assembly includes a No. 1 infusion pipe 2021, a No. 1 electric control valve 2022 and a No. 2 infusion pipe 2023; one end of the No. 1 infusion pipe 2021 is fixedly installed on one side of the original desulfurization tower 201 through a flange, and the other end is fixedly installed on one side of the No. 1 electric control valve 2022 through a flange; one end of the No. 2 infusion pipe 2023 is fixedly installed on one side of the No. 1 electric control valve 2022 through a flange, and the other end is fixedly installed on one side of the flash tank 203 through a flange. This is to allow the desulfurization slurry to be drawn out from one of the vertical pipelines of the original desulfurization tower 201, and the desulfurization slurry can be pumped into the flash tank 203 using the head of the original desulfurization slurry pump.

[0031] It can be understood that the liquid return assembly includes a No. 1 liquid return pipe 2041, a desizing liquid pump 2042, a No. 2 liquid return pipe 2043, a No. 3 liquid return pipe 2044, a No. 2 electric control valve 2045 and a No. 4 liquid return pipe 2046; one end of the No. 1 liquid return pipe 2041 is fixedly connected to one side of the flash tank 203 close to the concrete bottom plate 1, and the other end is fixedly installed on one side of the desizing liquid pump 2042, and the desizing liquid pump 2042 is fixedly installed on one side of the concrete bottom plate 1, one end of the No. 2 liquid return pipe 2043 is fixedly connected to one side of the desizing liquid pump 2042, and the other end is fixedly connected to one side of the No. 2 infusion pipe 2023, and the No. 3 liquid return pipe 2044 is fixedly connected to one side of the flash tank 203 close to the concrete bottom plate 1. One end of the liquid pipe 2044 is fixedly connected to one side of the No. 2 liquid infusion pipe 2023, and the other end is fixedly connected to one side of the No. 2 electric control valve 2045. The No. 2 liquid return pipe 2043 is connected to the No. 2 electric control valve 2045 through the No. 3 liquid return pipe 2044. One end of the No. 4 liquid return pipe 2046 is fixedly connected to the other side of the No. 2 electric control valve 2045, and the other end is fixedly connected to one side of the original desulfurization tower 201. This is to allow the desulfurized slurry after flash evaporation and cooling in the flash tank 203 to be pumped back to the original liquid return assembly through the No. 2 liquid return pipe 2043 arranged under the flash tank 203, so as to return to the original desulfurization tower 201.

[0032] In addition, the sum of the heights of the support legs 207 and the flash tank 203 is greater than the height of the original desulfurization tower 201, and the elevation of the support legs 207 fixed at the bottom of the flash tank 203 is not less than 10 meters, so that the desulfurization slurry after flash cooling can be pumped back to the original desulfurization tower 201 through the deslurry pump 2042 arranged directly below the flash tank 203.

[0033] In this embodiment, the No. 2 infusion pipe 2023 is composed of an L-shaped pipe and a direct current pipe, one end of the L-shaped pipe is fixedly connected to one side of the No. 1 electric control valve 2022, and the other end is fixedly connected to the direct current pipe, and the other end of the direct current pipe is fixedly installed on the flash tank 203 through a flange; the projection of the direct current pipe with the flash tank 203 in the first direction is an angle less than 75°, and the first direction is perpendicular to the plane direction of the flash tank 203, so that the desulfurization slurry is sprayed tangentially into the flash tank 203 in the middle of the flash tank 203 to form a fan-shaped liquid film, which is beneficial to improve the flash efficiency. Since the desulfurization slurry is a suspension, solid deposition is likely to occur when the flow rate is low. Therefore, the inclination of the direct current pipe design and the flow rate of the desulfurization slurry during operation are crucial.

[0034] It should also be noted that the No. 1 spray assembly includes a spray pipe 2051 and a No. 1 nozzle 2052; one end of the spray pipe 2051 is fixedly connected to one end of the No. 4 return liquid pipe 2046, and the other end is fixedly connected to the inner wall of the original desulfurization tower 201, so that the desulfurization slurry after flash evaporation and cooling can be sprayed out through the No. 1 nozzle 2052, in order to recycle the desulfurization slurry after flash evaporation and cooling.

[0035] In this embodiment, the absorption heat pump assembly 400 is a structure for recovering waste heat in negative pressure steam to heat heating water or a cold source.

[0036] like Figure 1 As shown, the absorption heat pump assembly 400 includes a lithium bromide absorption heat pump 401, a driving steam pipeline 402 and a drain tank 403; one side of the lithium bromide absorption heat pump 401 is fixedly installed on one side of the concrete base plate 1, the driving steam pipeline 402 is fixedly installed on one side of the lithium bromide absorption heat pump 401, and the drain tank 403 is fixedly installed on one side of the lithium bromide absorption heat pump 401, and is used to guide the generated exhaust steam condensate to the connecting assembly 600 through the water ring vacuum assembly 500 as a cleaning water source during operation.

[0037] In this embodiment, the water ring vacuum assembly 500 is a structure for ensuring the vacuum degree for normal operation of the device.

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the water ring vacuum assembly 500 includes a vacuum tank 501, a water ring vacuum pump 502, a connecting pipe 503, a waste steam condensate replenishing pipe 504 and a No. 2 spray assembly; the vacuum tank 501 is fixedly installed on one side of the water ring vacuum pump 502 on the side away from the concrete bottom plate 1, one end of the connecting pipe 503 is fixedly connected to one side of the water ring vacuum pump 502, and the other end passes through the vacuum tank 501 and is fixedly connected to the vacuum tank 501, one end of the waste steam condensate replenishing pipe 504 is fixedly connected to one side of the vacuum tank 501 close to the concrete bottom plate 1, and the other end is connected to one side of the No. 2 spray assembly, so as to The exhaust condensate generated by the condensation of negative pressure water vapor is used as the water source. While cleaning the corrugated plate, the concentration of the desulfurization slurry can be adjusted to prevent the concentration of the desulfurization slurry from increasing and forming sediment after flash evaporation, thereby ensuring the vacuum degree of the normal operation of the flash tank 203; the No. 2 spray assembly includes a connecting pipe 5051 and a No. 2 nozzle 5052; one end of the connecting pipe 5051 is fixedly connected to one end of the exhaust condensate replenishing pipe 504, so that the exhaust condensate generated by the condensation of the exhaust condensate replenishing pipe 504 can be sprayed out through a plurality of No. 2 nozzles 5052 fixedly connected to the connecting pipe 5051, so as to adjust the concentration of the desulfurization slurry.

[0039] In this embodiment, the connecting assembly 600 is a structure for separating tiny desulfurization slurry droplets carried in negative pressure steam.

[0040] like Figure 2As shown, the connection assembly 600 includes a fixed shell 601, a corrugated plate demister 602 and a funnel-shaped connection cover 603; one side of the fixed shell 601 is fixedly connected to one side of the flash tank 203, and the other side is fixedly connected to one side of the funnel-shaped connection cover 603, and the other side of the funnel-shaped connection cover 603 is fixedly connected to the U-shaped tube 3, and the corrugated plate demister 602 is fixedly installed in the fixed shell 601, and the corrugated plate demister 602 is used to separate tiny desulfurization slurry droplets carried in the negative pressure steam.

[0041] The working principle of the above embodiment is:

[0042] First, the flash tank 203 is arranged on a 10-meter-high support leg 207, and the vacuum degree of the flash tank 203 is set to about 92 kPa. The desulfurized slurry can be drawn out from the original desulfurization tower 201 through the No. 1 infusion pipe 2021 and the No. 2 infusion pipe 2023, and the desulfurized slurry is pumped into the flash tank 203 by using the head of the original desulfurized slurry pump on the original desulfurized tower 201. Since the desulfurized slurry is a suspension, solids are easily deposited when the flow rate is low. Therefore, the inclination of the direct current pipe ensures the flow rate of the desulfurized slurry during operation. The desulfurized slurry is sprayed into the flash tank 203 tangentially in the middle of the flash tank 203 to form a fan-shaped liquid film, which is beneficial to improve the flash evaporation efficiency. The negative pressure water vapor generated by the flash evaporation passes upward through the corrugated plate demister 602 to remove the tiny desulfurized slurry droplets carried in the water vapor, and then passes through the corrugated plate demister 603. A connecting pipe 5051 and a second nozzle 5052 are arranged above 02, and the exhaust condensate generated after the negative pressure water vapor of the lithium bromide absorption heat pump 401 is condensed can be used as a water source through the exhaust condensate replenishing pipe 504 on the vacuum tank 501, and sprayed out under the cooperation of the connecting pipe 5051 and the second nozzle 5052, which can clean the corrugated plate demister 602 and adjust the concentration of the desulfurization slurry to prevent the concentration of the desulfurization slurry from increasing and forming deposition after flash evaporation. The desulfurization slurry after flash evaporation and cooling flows into the deslurry pump 2042 arranged below the flash tank 203 through the first return liquid pipe 2041, and then passes through the second return liquid pipe 2043, the third return liquid pipe 2044 and the fourth return liquid pipe 2046 in turn, and enters the spray pipe 2051 in the original desulfurization tower 201, and finally sprayed out through the first nozzle 2052, so as to recycle the desulfurization slurry;

[0043] In addition, maintaining the liquid level of the desulfurization slurry in the flash tank 203 is the key to ensuring the stable operation of the flash tank 203. Under normal circumstances, the control of the liquid level of the flash tank 203 is achieved by adjusting the frequency of the deslurry pump 2042. Once the liquid level of the flash tank 203 is higher than the alarm value, the No. 2 electric control valve 2045 and the No. 1 electric control valve 2022 newly built on the No. 4 return pipe 2046 and the No. 1 infusion pipe 2021 can be urgently closed. Once the waste heat recovery system is shut down, the desulfurization slurry in the infusion component and the return component must be emptied in time, and the emptied desulfurization slurry must be pumped back to the original desulfurization tower 201.

[0044] Compared with the prior art: the desulfurization slurry waste heat recovery system based on flash evaporation, through the waste heat recovery mechanism 200 on the concrete base plate 1, the U-shaped tube 3, the absorption heat pump assembly 400, the water ring vacuum assembly 500 and the connecting assembly 600, uses flash evaporation to recover waste heat. Compared with the traditional partition wall heat exchange device, the negative pressure water vapor flashed out is relatively pure and its corrosiveness is much lower than that of the desulfurization slurry. At the same time, the heat exchange of negative pressure water vapor will not have problems of blockage and wear, and the efficiency of vapor-liquid heat exchange is also higher than that of liquid-liquid heat exchange. By recovering the waste heat of the desulfurization slurry by flash evaporation, 7% to 8% of the waste heat of the boiler load can be recovered, which is much higher than the existing flue gas waste heat recovery technology, thereby effectively improving the use effect of the existing desulfurization slurry waste heat recovery device and solving the problem of poor use effect of the existing desulfurization slurry waste heat recovery device.

[0045] The electrical components appearing in the text are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device that controls a computer, etc., and the existing publicly available power connection technology and power supply are also common knowledge in the field, so this application will not go into details.

[0046] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0047] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention.

Claims

1. A desulfurization slurry waste heat recovery system based on flash evaporation, comprising a concrete base plate (1), a U-shaped tube (3), an absorption heat pump component (400) and a water ring vacuum component (500), Features: A waste heat recovery mechanism (200), a connection assembly (600), a U-shaped pipe (3), an absorption heat pump assembly (400) and a water ring vacuum assembly (500) are sequentially installed on the same side of the concrete bottom plate (1) from left to right. The waste heat recovery mechanism (200) passes the negative pressure water vapor generated by flash evaporation upward through the connection assembly (600) to remove tiny desulfurization slurry droplets carried in the water vapor. The waste heat recovery mechanism (200) also cools the desulfurization slurry in the waste heat recovery mechanism. The water ring vacuum component (500) is connected to the water ring vacuum component (500) to use the exhaust condensate generated by condensing the negative pressure water vapor of the water ring vacuum component (500) as a water source to clean the connecting component (600). The connecting component (600) is connected to the absorption heat pump component (400) through the U-shaped pipe (3). The absorption heat pump component (400) is used to recover the waste heat in the negative pressure steam to heat the heating water or the cooling source. The waste heat recovery mechanism (200) comprises an original desulfurization tower (201) fixedly mounted on one side of the concrete bottom plate (1) and a high-temperature flue gas inlet pipe (208) fixedly mounted on one side of the original desulfurization tower (201) for injecting high-temperature flue gas, an infusion assembly is mounted on the other side of the original desulfurization tower (201), a flash tank (203) is mounted on one end of the infusion assembly, evenly distributed legs (207) are fixedly mounted on the outer surface of the flash tank (203) and on one side close to the concrete bottom plate (1), a liquid return assembly penetrating and connected to the original desulfurization tower (201) is mounted on one side of the flash tank (203) close to the concrete bottom plate (1), a No. 1 spray assembly located in the original desulfurization tower (201) is mounted on one side of the liquid return assembly, and a high-temperature flue gas inlet pipe (208) is mounted between the infusion assembly and the liquid return assembly.

2. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 1, Features: The infusion assembly comprises a No. 1 infusion pipe (2021), a No. 1 electric control valve (2022) and a No. 2 infusion pipe (2023); one end of the No. 1 infusion pipe (2021) is fixedly installed on one side of the original desulfurization tower (201) through a flange, and the other end is fixedly installed on one side of the No. 1 electric control valve (2022) through a flange; one end of the No. 2 infusion pipe (2023) is fixedly installed on one side of the No. 1 electric control valve (2022) through a flange, and the other end is fixedly installed on one side of the flash tank (203) through a flange.

3. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 2, Features: The liquid return assembly comprises a No. 1 liquid return pipe (2041), a desizing liquid pump (2042), a No. 2 liquid return pipe (2043), a No. 3 liquid return pipe (2044), a No. 2 electric control valve (2045) and a No. 4 liquid return pipe (2046); one end of the No. 1 liquid return pipe (2041) is fixedly connected to a side of the flash tank (203) close to the concrete bottom plate (1), and the other end is fixedly installed on a side of the desizing liquid pump (2042); the desizing liquid pump (2042) is fixedly installed on a side of the concrete bottom plate (1); one end of the No. 2 liquid return pipe (2043) is fixedly connected to the desizing liquid pump (2046). 042), and the other end is fixedly connected to one side of the No. 2 liquid infusion pipe (2023); one end of the No. 3 liquid return pipe (2044) is fixedly connected to one side of the No. 2 liquid infusion pipe (2023), and the other end is fixedly connected to one side of the No. 2 electric control valve (2045); the No. 2 liquid return pipe (2043) is connected to the No. 2 electric control valve (2045) through the No. 3 liquid return pipe (2044); one end of the No. 4 liquid return pipe (2046) is fixedly connected to the other side of the No. 2 electric control valve (2045), and the other end is fixedly connected to one side of the original desulfurization tower (201).

4. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 1, Features: The sum of the heights of the support leg (207) and the flash tank (203) is greater than the height of the original desulfurization tower (201).

5. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 2, Features: The No. 2 infusion pipe (2023) is composed of an L-shaped pipe and a direct current pipe, one end of the L-shaped pipe is fixedly connected to one side of the No. 1 electric control valve (2022), and the other end is fixedly connected to the direct current pipe, and the other end of the direct current pipe is fixedly mounted to the flash tank (203) via a flange; the direct current pipe forms an angle of less than 75° with respect to the projection of the flash tank (203) in a first direction, and the first direction is perpendicular to the plane direction of the flash tank (203).

6. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 3, Features: The No. 1 spray assembly comprises a spray pipe (2051) and a No. 1 spray head (2052); one end of the spray pipe (2051) is fixedly connected to one end of the No. 4 liquid return pipe (2046), and the other end is fixedly connected to the inner wall of the original desulfurization tower (201).

7. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 1, Features: The absorption heat pump assembly (400) comprises a lithium bromide absorption heat pump (401), a driving steam pipeline (402) and a drain tank (403); one side of the lithium bromide absorption heat pump (401) is fixedly mounted on one side of the concrete base plate (1), the driving steam pipeline (402) is fixedly mounted on one side of the lithium bromide absorption heat pump (401), and the drain tank (403) is fixedly mounted on one side of the lithium bromide absorption heat pump (401).

8. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 1, Features: The water ring vacuum assembly (500) comprises a vacuum tank (501), a water ring vacuum pump (502), a connecting pipe (503), a waste steam condensate supply pipe (504) and a No. 2 spray assembly; the vacuum tank (501) is fixedly installed on one side of the water ring vacuum pump (502) on the side away from the concrete bottom plate (1); one end of the connecting pipe (503) is fixedly connected to one side of the water ring vacuum pump (502), and the other end passes through the vacuum tank (501) and is fixedly connected to the vacuum tank (501); one end of the waste steam condensate supply pipe (504) is fixedly connected to one side of the vacuum tank (501) close to the concrete bottom plate (1), and the other end is connected to one side of the No. 2 spray assembly; the No. 2 spray assembly comprises a connecting pipe (5051) and a No. 2 spray head (5052); one end of the connecting pipe (5051) is fixedly connected to one end of the waste steam condensate supply pipe (504).

9. A desulfurization slurry waste heat recovery system based on flash evaporation according to claim 1, Features: The connecting assembly (600) comprises a fixed shell (601), a corrugated plate demister (602) and a funnel-shaped connecting cover (603); one side of the fixed shell (601) is fixedly connected to one side of the flash tank (203), and the other side is fixedly connected to one side of the funnel-shaped connecting cover (603); the other side of the funnel-shaped connecting cover (603) is fixedly connected to the U-shaped tube (3), and the corrugated plate demister (602) is fixedly installed in the fixed shell (601).

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