Nano calcium carbonate tail gas waste heat multi-stage recovery device

Abstract

The invention belongs to the technical field of heat energy recovery, and particularly relates to a nano calcium carbonate tail gas waste heat multi-stage recovery device which comprises a rack, a heat insulation box is fixedly installed at the top of the rack, and heat introduced into tail gas is isolated in a box body through the heat insulation box; the device further comprises a pressure reducing valve installed on one side of the heat insulation box, the pressure reducing valve is used for reducing the pressure and the flow speed of introduced tail gas, a heat storage water tank internally storing water is fixedly assembled on the inner wall of the top of the heat insulation box, the top of the heat storage water tank is open and attached to the inner wall of the top of the heat insulation box in a sealed mode, and the size of the heat storage water tank is smaller than that of the heat insulation box. Through an S-shaped flow guide path formed by the first flow guide plate and the second flow guide plate in the heat insulation box, tail gas makes full contact with the heat storage water tank, efficient heat exchange is achieved, the heat conduction pipe is spirally distributed in the heat storage water tank, and the recovery efficiency of tail gas waste heat is further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat recovery, and in particular relates to a multi-stage recovery device for waste heat of nano-calcium carbonate tail gas. Background Art

[0002] With the increasing global emphasis on energy conservation, emission reduction, and green manufacturing, high-energy-consuming industries such as chemicals and building materials are constantly exploring new ways to improve energy efficiency. Nano-calcium carbonate, an important inorganic functional material, is widely used in plastics, rubber, coatings, inks, and other fields. Its production typically involves calcining limestone to generate calcium oxide, which is then carbonized to form nano-calcium carbonate. This process generates large amounts of high-temperature exhaust gas, which contains considerable waste heat resources. Properly recovering and utilizing this waste heat not only helps reduce corporate energy consumption but also greenhouse gas emissions, offering significant economic and environmental benefits.

[0003] At present, for the recovery of waste heat from tail gas in the production of nano-calcium carbonate, a single heat exchange device is mainly used for heat exchange, such as a shell-and-tube heat exchanger or a heat pipe heat exchanger, which often cannot achieve efficient recovery of heat at different temperature levels in the tail gas, resulting in low overall energy utilization. Secondly, considering that the tail gas may contain corrosive gases and particulate matter, when it directly contacts the heat exchange equipment, it will not only aggravate the wear and corrosion of the heat exchange equipment and shorten the service life of the equipment, but may also cause system blockage. Finally, the tail gas after passing through the heat exchange equipment is mixed with pollutants and cannot be discharged directly. It needs to be safely treated by additional waste gas treatment equipment before being discharged in an environmentally friendly manner, which increases investment and maintenance costs. Therefore, we propose a multi-stage recovery device for waste heat from tail gas of nano-calcium carbonate to solve the above problems. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a multi-stage recovery device for waste heat of nano-calcium carbonate tail gas.

[0005] The technical solution is as follows: A multi-stage recovery device for waste heat from tail gas of nano-calcium carbonate, comprising a frame and a heat insulation box, wherein the frame is the mounting carrier of the device, and a heat insulation box is fixedly mounted on the top of the frame, and the heat insulation box isolates the heat of the incoming tail gas in the box; further comprising a pressure reducing valve mounted on one side of the heat insulation box, the pressure reducing valve is used to reduce the pressure and flow rate of the incoming tail gas, a hot water storage tank with water storage is fixedly mounted on the inner wall of the top of the heat insulation box, the top of the hot water storage tank is open and sealed on the inner wall of the top of the heat insulation box, the size of the hot water storage tank is smaller than the heat insulation box, the hot water storage tank has good thermal conductivity, and a first side chamber is provided between the heat insulation box and the hot water storage tank A guide plate, a second guide plate is provided in the bottom chamber between the thermal insulation box and the hot water storage tank, the first guide plate and the second guide plate are used to guide the exhaust gas in the thermal insulation box, the lower part of the frame is fixedly connected to the bottom plate on the side away from the pressure reducing valve, a steam turbine for converting thermal energy into mechanical energy is installed on the bottom plate, the thermal insulation box is connected to the steam turbine through a steam pipe at the top opening corresponding to the hot water storage tank, the outer wall of the thermal insulation box away from the pressure reducing valve is connected to a connecting pipe, a spray tower is installed on the top of the thermal insulation box, the connecting pipe of the thermal insulation box is connected to a heat conducting pipe, the heat conducting pipe is sealed and passes through the thermal insulation box and the hot water storage tank and then connected to the spray tower, the spray tower is used for cooling and filtering the exhaust gas.

[0006] Preferably, the first guide plate and the second guide plate are alternately distributed on the box wall between the insulation box and the hot water storage tank. The first guide plate and the second guide plate are inclined along the direction of exhaust gas introduction. The exhaust gas introduced into the insulation box will be continuously guided in an "S" shape by the first guide plate and the second guide plate.

[0007] Preferably, the heat conducting pipe is sealed and passes through the heat insulation box into the hot water storage tank. The heat conducting pipe is spirally distributed in the hot water storage tank to increase the contact area between the heat conducting pipe and the water in the hot water storage tank.

[0008] Preferably, the steam turbine includes a mounting base fixedly arranged on a base plate, a shell fixedly assembled on the mounting base, a rotor rotatably mounted in the shell, two groups of turbine blades symmetrically fixedly mounted on the axis of the rotor, and a plurality of turbine blades are arranged at intervals in each group. Both ends of the rotor are fixedly connected to a power shaft, and the power shaft is used to output mechanical energy to the outside.

[0009] Preferably, the spray tower includes a tower body fixedly mounted on the top of the heat insulation box, an air inlet pipe is provided on one side of the upper part of the tower body, the air inlet pipe is connected to the heat conduction pipe, an air outlet pipe is provided on one side of the lower part of the tower body, and a plurality of spray heads are circumferentially installed near the upper middle part of the inner wall of the tower body, the joints of the spray heads are exposed on the outer wall of the tower body, and the spray heads are used to spray liquid (usually water or chemical absorbent) into the tower body.

[0010] Preferably, a filter mechanism for filtering exhaust gas is provided on the outside of the box body of the heat insulation box away from the pressure reducing valve, and the filter mechanism includes a support plate fixedly connected to the outer wall of the heat insulation box, and a filter box is fixedly installed on the support plate. The outlet pipe of the spray tower is connected to the filter box through the exhaust pipe, and a partition is provided in the filter box. The partition divides the filter box into two chambers, and one of the chambers of the filter box is equipped with multiple filter layers. The exhaust pipe is connected to the chamber where the filter layer is located in the filter box, and an exhaust fan is fixedly installed in the other chamber of the filter box. The air inlet of the exhaust fan passes through the partition and is connected to the chamber where the filter layer is located in the heat insulation box. An exhaust pipe is provided on the outer wall of the chamber where the exhaust fan is located in the filter box, and the air outlet of the exhaust fan is connected to the exhaust pipe through a pipe.

[0011] Preferably, a cleaning plate is slidingly provided at the filter layer on the air inlet side of the exhaust pipe in the filter box. The cleaning plate is a grid plate with a plurality of openings spaced apart. The cleaning plate is in sliding contact with the surface of the filter layer. The cleaning plate is used to slide and clean filter blockages on the surface of the filter layer. A driving mechanism for driving the cleaning plate to perform a cleaning movement is provided on the power shaft of the steam turbine close to the filter box side.

[0012] Preferably, the driving mechanism includes a fixed plate fixedly connected to the base plate, a driving pulley is rotatably connected to the fixed plate, a synchronous wheel is fixedly mounted on the power shaft of the steam turbine close to the filter box, a transmission belt is wound between the synchronous wheel of the power shaft and the driving pulley, the driving pulley is larger than the synchronous wheel, a connecting rod is eccentrically hinged on the disk surface of the driving pulley, a driving rod is fixedly connected to the bottom of the cleaning plate, the driving rod slides through the bottom of the filter box, and the rod ends of the driving rod and the connecting rod away from the hinge point are hinged to each other.

[0013] Beneficial effects of the present invention: 1. The present invention uses an "S"-shaped guide path composed of the first guide plate and the second guide plate in the heat insulation box to ensure full contact between the exhaust gas and the heat storage tank, achieving efficient heat exchange. Combined with the spiral distribution of the heat conduction pipe in the heat storage tank, the efficiency of exhaust gas waste heat recovery is further improved.

[0014] 2. The present invention can also cool the exhaust gas and remove particulate matter and some harmful gases through the spray tower, thereby improving the exhaust gas treatment effect. In conjunction with the filtering mechanism, multiple filter layers and exhaust fans are set to perform secondary fine filtration on the exhaust gas to ensure that the exhaust gas meets environmental protection standards.

[0015] 3. The heat storage tank of the present invention absorbs heat to raise the water temperature until it boils and produces steam. The steam drives the steam turbine to convert thermal energy into mechanical energy, realizing energy conversion and reuse. In addition, the driving mechanism and the power shaft output by the steam turbine can drive the cleaning plate to automatically clean the blockage on the surface of the filter layer, thereby reducing the frequency of manual maintenance and improving the operating efficiency and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 This is a connection diagram of the heat insulation box, pressure reducing valve, steam turbine and steam pipe of the present invention.

[0018] Figure 3 It is a cross-sectional view of specific components in the steam turbine of the present invention.

[0019] Figure 4 It is a schematic diagram of the thermal insulation box, the hot water storage tank, the first guide plate and the second guide plate of the present invention.

[0020] Figure 5 It is a schematic diagram of the coordination relationship among the heat insulation box, the heat storage tank, the connecting pipe and the heat conducting pipe of the present invention.

[0021] Figure 6 This is a diagram showing the connection relationship between the tower body, waste gas pipe, exhaust pipe and filtering mechanism of the present invention.

[0022] Figure 7 Schematic diagram of the filter box, partition, filter layer, exhaust fan and exhaust pipe of the present invention.

[0023] Figure 8 This is a diagram showing the coordination of the filter layer, cleaning plate, and drive mechanism in the filter box of the present invention.

[0024] Figure 9 Schematic diagram of specific components of the driving mechanism of the present invention.

[0025] Explanation of the accompanying drawings: 1-frame, 2-insulation box, 3-pressure reducing valve, 4-heat storage tank, 5-first guide plate, 6-second guide plate, 7-bottom plate, 8-steam turbine, 81-mounting seat, 82-casing, 83-rotor, 84-turbine blades, 85-power shaft, 9-steam pipe, 10-connecting pipe, 11-spray tower, 111-tower body, 112-inlet pipe, 113-outlet pipe, 114-spray head, 12-heat conduction pipe, 13-filter mechanism, 131-support plate, 132-filter box, 133-partition, 134-filter layer, 135-exhaust fan, 14-exhaust pipe, 15-exhaust pipe, 16-cleaning plate, 17-driving mechanism, 171-fixed plate, 172-driving pulley, 173-synchronizing wheel, 174-transmission belt, 175-connecting rod, 176-driving rod. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that the technical features involved in the different embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0028] Example 1: A nano calcium carbonate tail gas waste heat multi-stage recovery device, such as Figure 1-Figure 5As shown, it includes a frame 1 and an insulation box 2. The frame 1 is the installation carrier of the device. The insulation box 2 is fixedly installed on the top of the frame 1. The insulation box 2 isolates the heat of the exhaust gas entering the box; it also includes a pressure reducing valve 3 installed on one side of the insulation box 2. The pressure reducing valve 3 is used to reduce the pressure and flow rate of the exhaust gas entering. The inner wall of the top of the insulation box 2 is fixedly equipped with a hot water storage tank 4 with water stored inside. The top of the hot water storage tank 4 is an opening and is sealed and attached to the inner wall of the top of the insulation box 2. The size of the hot water storage tank 4 is smaller than the insulation box 2. The hot water storage tank 4 has good thermal conductivity. The insulation box 2 and the heat storage tank A first guide plate 5 is provided in the side chamber between the water tanks 4, and a second guide plate 6 is provided in the bottom chamber between the heat insulation box 2 and the hot water storage tank 4. The first guide plate 5 and the second guide plate 6 are used to guide the exhaust gas in the heat insulation box 2. The lower part of the frame 1 is fixedly connected to the bottom plate 7 on the side away from the pressure reducing valve 3. A steam turbine 8 for converting thermal energy into mechanical energy is installed on the bottom plate 7. The top opening of the heat insulation box 2 corresponding to the hot water storage tank 4 is connected to the steam turbine 8 through a steam pipe 9. The outer wall of the heat insulation box 2 away from the pressure reducing valve 3 is connected to a connecting pipe 10. A spray tower 1 is installed on the top of the heat insulation box 2. 1, the connecting pipe 10 of the heat insulation box 2 is connected with a heat conducting pipe 12, the heat conducting pipe 12 is sealed and passes through the heat insulation box 2 and the heat storage tank 4 and then connected to the spray tower 11. The spray tower 11 is used for cooling and filtering the exhaust gas. The exhaust gas to be recovered is decompressed by the pressure reducing valve 3 and then slowly introduced into the heat insulation box 2. The high-temperature exhaust gas introduced is guided by the first guide plate 5 and the second guide plate 6. The exhaust gas flowing through the heat insulation box 2 can fully contact with the heat storage tank 4, so that the exhaust gas in the heat insulation box 2 can be transferred to the heat storage tank 4 through heat transfer. The exhaust gas flowing out of the connecting pipe 10 on the heat insulation box 2 is passed through the heat insulation box 2. In the process of flowing into the spray tower 11 through the heat conduction pipe 12, the exhaust gas in the heat conduction pipe 12 will flow through the heat storage tank 4 again, so that the residual heat energy in the exhaust gas will be further transferred to the water in the heat storage tank 4. As the exhaust gas continues to flow into the heat storage tank 4, the temperature will continue to rise, and the water in the heat storage tank 4 will gradually recover the heat in the exhaust gas. After the water in the heat storage tank 4 boils, the water vapor generated will flow into the steam turbine 8 through the steam pipe 9. The steam turbine 8 will convert the thermal energy into mechanical energy. After the steam turbine 8 is connected to the generator, the mechanical energy can be further converted into electrical energy for storage and utilization.

[0029] like Figure 3 and Figure 4 As shown, the first guide plate 5 and the second guide plate 6 are alternately distributed on the box wall between the insulation box 2 and the hot water storage tank 4. The first guide plate 5 and the second guide plate 6 are inclined along the direction of exhaust gas introduction. The exhaust gas introduced into the insulation box 2 will be continuously guided in an "S" shape by the first guide plate 5 and the second guide plate 6, so that the exhaust gas can fully contact the outer wall of the hot water storage tank 4, so that the heat in the exhaust gas can be fully transferred to the hot water storage tank 4.

[0030] like Figure 2 and Figure 5As shown, the heat pipe 12 is sealed and passes through the insulation box 2 to enter the hot water storage tank 4. The heat pipe 12 is spirally distributed in the hot water storage tank 4, which increases the contact area between the heat pipe 12 and the water in the hot water storage tank 4, thereby further improving the recovery efficiency of the exhaust waste heat.

[0031] like Figure 1-Figure 3 As shown, the steam turbine 8 includes a mounting base 81 fixedly set on the base plate 7, a shell 82 is fixedly assembled on the mounting base 81, a rotor 83 is rotatably installed in the shell 82, two groups of turbine blades 84 are symmetrically fixedly installed on the axis of the rotor 83, and each group of turbine blades 84 is arranged with multiple blades at intervals. Both ends of the rotor 83 are fixedly connected to a power shaft 85, which is used to output mechanical energy to the outside.

[0032] like Figure 1 、 Figure 2 and Figure 6 As shown, the spray tower 11 includes a tower body 111 fixedly assembled on the top of the heat insulation box 2, an air inlet pipe 112 is provided on one side of the upper part of the tower body 111, and the air inlet pipe 112 is communicated with the heat conduction pipe 12, an air outlet pipe 113 is provided on one side of the lower part of the tower body 111, and a plurality of spray heads 114 are circumferentially installed near the upper middle part of the inner wall of the tower body 111, and the joints of the spray heads 114 are exposed on the outer wall of the tower body 111. The spray heads 114 are used to spray liquid (usually water or chemical absorbent) into the tower body 111. The sprayed liquid can fully contact with the exhaust gas entering the tower body 111, effectively removing larger particulate matter and some water-soluble harmful substances in the exhaust gas.

[0033] When the device is used to recover the waste heat of tail gas during the production of nano calcium carbonate, the tail gas first enters the heat insulation box 2 through the pressure reducing valve 3. The pressure reducing valve 3 adjusts the pressure and flow rate of the tail gas inlet so that the tail gas enters the heat energy recovery stage in the heat insulation box 2 in a stable and controllable state. After the high-temperature tail gas enters the heat insulation box 2, it forms an "S"-shaped circuitous flow path under the guidance of the alternatingly distributed first guide plate 5 and the second guide plate 6, and flows on the surface of the heat storage tank 4, thereby effectively extending the residence time of the tail gas in the heat insulation box 2, and at the same time forcing the tail gas to repeatedly flow close to the outer wall of the heat storage tank 4. Since the heat storage tank 4 is made of high thermal conductivity material, the heat in the tail gas is continuously transferred to the water in the heat storage tank 4 through heat conduction, causing the water temperature to gradually increase. When the water in the heat storage tank 4 absorbs enough heat to reach the boiling point, the water vapor is transported to the steam turbine 8 through the steam pipe 9 at the top. The multi-stage turbine blades 84 inside the steam turbine 8 rotate at high speed under the impetus of high-pressure steam, converting thermal energy into mechanical energy, and through power The output of shaft 85 provides power for subsequent power generation or driving other equipment. At the same time, the exhaust gas that has passed through the heat storage tank 4 and completed the initial heat exchange will enter the spiral heat pipe 12 through the connecting pipe 10. The heat pipe 12 runs through the interior of the heat storage tank 4 in a spiral form. In the process of the exhaust gas flowing through the spiral pipe, the residual heat in the exhaust gas contacts the water in the heat storage tank 4 through the pipe wall and undergoes secondary heat exchange, further reducing the exhaust gas temperature and improving the recovery efficiency of the waste heat. The exhaust gas temperature after multi-stage heat exchange It has been greatly reduced, and then flows from the heat pipe 12 through the air inlet pipe 112 into the tower body 111 of the spray tower 11. The exhaust gas flows from top to bottom in the spray tower 11, and at the same time, multiple spray heads 114 in the tower body 111 are connected to the external spraying liquid. The water mist or chemical absorbent sprayed by the spray head 114 contacts the exhaust gas, and the spray droplets effectively capture the residual particulate matter, soluble pollutants and some harmful gases in the exhaust gas through the dual effects of physical interception and chemical absorption, so that the exhaust gas meets the conditions for preliminary emission.

[0034] Example 2: Based on Example 1, Figure 1 、 Figure 6 and Figure 7As shown, the heat insulation box 2 is provided with a filter mechanism 13 for filtering the exhaust gas outside the box body away from the pressure reducing valve 3. The filter mechanism 13 includes a support plate 131 fixedly connected to the outer wall of the heat insulation box 2, and a filter box 132 is fixedly installed on the support plate 131. The outlet pipe 113 of the spray tower 11 is connected to the filter box 132 through the exhaust pipe 14. A layer of partition 133 is provided in the filter box 132. The partition 133 divides the filter box 132 into two chambers. One of the chambers of the filter box 132 is equipped with a multi-layer filter layer 134. The exhaust pipe 14 is connected to the chamber where the filter layer 134 is located in the filter box 132. A fixed filter is installed in the other chamber of the filter box 132. It is equipped with an exhaust fan 135, and the air inlet of the exhaust fan 135 passes through the partition 133 and is connected to the chamber where the filter layer 134 is located in the heat insulation box 2. An exhaust pipe 15 is provided on the outer wall of the chamber where the exhaust fan 135 is located in the filter box 132. The air outlet of the exhaust fan 135 is connected to the exhaust pipe 15 through a pipeline. The exhaust gas that has been cooled and preliminarily filtered by the spray tower 11 will enter the filter box 132 through the exhaust pipe 14. The exhaust gas will be subjected to secondary fine filtration of nano-level particulate matter, organic compounds and other harmful gases in the exhaust gas by the multiple layers of filter layers 134 in the filter box 132, and the filtered gas will be safely discharged through the exhaust pipe 15 in conjunction with the exhaust fan 135.

[0035] like Figure 8 As shown, a cleaning plate 16 is slidingly provided at the filter layer 134 on the air inlet side of the exhaust pipe 14 in the filter box 132. The cleaning plate 16 is a grid plate with multiple openings spaced apart. The cleaning plate 16 is in sliding contact with the surface of the filter layer 134. The cleaning plate 16 is used to slide and clean the filter blockages on the surface of the filter layer 134. A driving mechanism 17 for driving the cleaning plate 16 to perform a cleaning movement is provided on the power shaft 85 of the steam turbine 8 close to the side of the filter box 132. Since the surface of the filter layer 134 is the first filter layer, the surface of the filter layer 134 is more easily clogged by pollutants. The power shaft 85 of the steam turbine 8 automatically drives the cleaning plate 16 to reciprocate and clean the surface of the filter layer 134 through the driving mechanism 17, so that the blockages on the surface of the filter layer 134 can be effectively cleaned, thereby increasing the service life of the filter layer 134 in the filter box 132 and reducing the frequency of replacing the filter layer 134.

[0036] like Figure 8 and Figure 9As shown, the driving mechanism 17 includes a fixed plate 171 fixedly connected to the bottom plate 7, and a driving wheel 172 is rotatably connected to the fixed plate 171. A synchronous wheel 173 is fixedly installed on the power shaft 85 of the steam turbine 8 near the filter box 132. A transmission belt 174 is wound between the synchronous wheel 173 of the power shaft 85 and the driving wheel 172. The driving wheel 172 is larger than the synchronous wheel 173. A connecting rod 175 is eccentrically hinged on the disk surface of the driving wheel 172. The bottom of the cleaning plate 16 is fixed. A drive rod 176 is fixedly connected, and the drive rod 176 slides through the bottom of the filter box 132. The drive rod 176 and the rod ends of the connecting rod 175 away from the hinge point are hinged to each other. The synchronous wheel 173 on the power shaft 85 drives the drive wheel 172 to rotate through the transmission belt 174 at a differential speed. The connecting rod 175 on the drive wheel 172 can act on the drive rod 176, so that the drive rod 176 can synchronously drive the cleaning plate 16 to move back and forth up and down, thereby realizing automatic scraping and cleaning of blockages on the surface of the filter layer 134.

[0037] After preliminary purification, the exhaust gas enters the filter box 132 from the outlet of the spray tower 11 through the exhaust pipe 14. The multiple filter layers 134 (such as activated carbon, HEPA filter, or catalytic material) in the box gradually adsorb nano-sized particles, volatile organic compounds, and residual harmful components. To ensure the long-term and efficient operation of the filter layer 134, the power shaft 85 of the steam turbine 8 will drive the drive wheel 172 to rotate through the synchronous pulley 173 and the transmission belt 174. The rotating drive wheel 172 will repeatedly pull the drive rod 176 through the connecting rod 175, thereby driving the cleaning plate 16 to reciprocate up and down in the filter box 132. The cleaning plate 16 can automatically scrape off blockages accumulated on the surface of the first filter layer, effectively extending the service life of the filter layer 134. The purified exhaust gas is finally guided by the exhaust fan 135 and safely discharged into the atmosphere through the exhaust pipe 15. This effectively recovers the exhaust heat while achieving deep exhaust purification and long-term stable operation of the system, reflecting the coordinated optimization of energy recycling and environmental protection.

[0038] The above is a detailed introduction to the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A nano calcium carbonate tail gas waste heat multi-stage recovery device, comprising a frame (1) with a heat insulation box (2) fixedly mounted on the top; It is characterized in that The heat insulation box (2) further comprises a pressure reducing valve (3) mounted on one side of the heat insulation box (2); a water storage tank (4) for storing water is fixedly mounted on the inner wall of the top of the heat insulation box (2); the top of the water storage tank (4) is open and is sealed against the inner wall of the top of the heat insulation box (2); the water storage tank (4) is smaller than the heat insulation box (2); a first guide plate (5) is provided in the side chamber between the heat insulation box (2) and the water storage tank (4); a second guide plate (6) is provided in the bottom chamber between the heat insulation box (2) and the water storage tank (4); the lower portion of the frame (1) is away from the pressure reducing valve (3); One side is fixedly connected to a bottom plate (7), a steam turbine (8) is installed on the bottom plate (7), the top opening of the heat insulation box (2) corresponding to the hot water storage tank (4) is connected to the steam turbine (8) through a steam pipe (9), the outer wall of the heat insulation box (2) away from the pressure reducing valve (3) is provided with a connecting pipe (10), the top of the heat insulation box (2) is installed with a spray tower (11), the connecting pipe (10) of the heat insulation box (2) is connected to a heat conduction pipe (12), and the heat conduction pipe (12) is sealed and passes through the heat insulation box (2) and the hot water storage tank (4) and then connected to the spray tower (11).

2. A nano calcium carbonate tail gas waste heat multi-stage recovery device according to claim 1, characterized in that, The first guide plates (5) and the second guide plates (6) are alternately spaced and distributed on the box wall between the thermal insulation box (2) and the hot water storage tank (4), and the first guide plates (5) and the second guide plates (6) are arranged obliquely along the exhaust gas inlet direction.

3. A nano calcium carbonate tail gas waste heat multi-stage recovery device according to claim 2, characterized in that, The heat conducting pipe (12) is sealed and passes through the heat insulating box (2) and is introduced into the hot water storage tank (4). The heat conducting pipe (12) is distributed in a spiral shape in the hot water storage tank (4).

4. A nano calcium carbonate tail gas waste heat multi-stage recovery device according to claim 3, characterized in that, The steam turbine (8) includes a mounting base (81) fixedly arranged on a base plate (7), a housing (82) fixedly assembled on the mounting base (81), a rotor (83) rotatably mounted in the housing (82), two groups of turbine blades (84) symmetrically fixedly mounted on the shaft of the rotor (83), a plurality of turbine blades (84) being arranged at intervals in each group, and a power shaft (85) being fixedly connected to both ends of the rotor (83).

5. A nano calcium carbonate tail gas waste heat multi-stage recovery device according to claim 4, characterized in that: The spray tower (11) includes a tower body (111) fixedly mounted on the top of the heat insulation box (2); an air inlet pipe (112) is provided on one side of the upper portion of the tower body (111); the air inlet pipe (112) is connected to the heat conduction pipe (12); an air outlet pipe (113) is provided on one side of the lower portion of the tower body (111); a plurality of spray heads (114) are circumferentially installed at the upper middle portion of the inner wall of the tower body (111); the joints of the spray heads (114) are exposed on the outer wall of the tower body (111).

6. A nano-calcium carbonate tail gas waste heat multi-stage recovery device according to claim 5, characterized in that: A filter mechanism (13) for filtering tail gas is provided on the outer side of the heat insulation box (2) away from the pressure reducing valve (3). The filter mechanism (13) includes a support plate (131) fixedly connected to the outer wall of the heat insulation box (2). A filter box (132) is fixedly mounted on the support plate (131). The outlet pipe (113) of the spray tower (11) is connected to the filter box (132) through the exhaust pipe (14). A partition (133) is provided in the filter box (132). The partition (133) divides the filter box (132) into two chambers. One of the chambers of the filter box (132) is connected to the exhaust pipe (14). The chamber is equipped with multiple filter layers (134), the exhaust pipe (14) is connected to the chamber where the filter layer (134) is located in the filter box (132), and an exhaust fan (135) is fixedly installed in another chamber of the filter box (132). The air inlet of the exhaust fan (135) passes through the partition (133) and is connected to the chamber where the filter layer (134) is located in the heat insulation box (2). An exhaust pipe (15) is provided on the outer wall of the chamber where the exhaust fan (135) is located in the filter box (132), and the air outlet of the exhaust fan (135) is connected to the exhaust pipe (15) through a pipeline.

7. A nano-calcium carbonate tail gas waste heat multi-stage recovery device according to claim 6, characterized in that: A cleaning plate (16) is slidably provided at the filter layer (134) on the air inlet side of the exhaust pipe (14) in the filter box (132). The cleaning plate (16) is a grid plate with a plurality of openings spaced apart. The cleaning plate (16) and the surface of the filter layer (134) are in sliding contact. A driving mechanism (17) for driving the cleaning plate (16) to move is provided on the power shaft (85) of the steam turbine (8) on the side close to the filter box (132).

8. A nano-calcium carbonate tail gas waste heat multi-stage recovery device according to claim 7, characterized in that: The driving mechanism (17) includes a fixed plate (171) fixedly connected to the base plate (7), a driving wheel disc (172) being rotatably connected to the fixed plate (171), a synchronous wheel (173) being fixedly mounted on the power shaft (85) of the steam turbine (8) near the filter box (132), a transmission belt (174) being wound between the synchronous wheel (173) of the power shaft (85) and the driving wheel disc (172), the driving wheel disc (172) being larger than the synchronous wheel (173), a connecting rod (175) being eccentrically hinged on the disk surface of the driving wheel disc (172), a driving rod (176) being fixedly connected to the bottom of the cleaning plate (16), the driving rod (176) slidingly penetrating the bottom of the filter box (132), and the rod ends of the driving rod (176) and the connecting rod (175) being hinged to each other away from the hinge point.

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