A flue gas dust removal and desulfurization waste heat recovery device

Abstract

The present application discloses a flue gas dust removal and desulfurization waste heat recovery device, which relates to the field of waste gas treatment technology, including a desulfurization container, a dust removal component, a dehydration component and a multifunctional pipe; an exchange water inlet, an exchange water outlet and a flue gas inlet are provided on the side wall of the desulfurization container; the multifunctional pipe is coiled on the inner wall of the desulfurization container, including a metal pipe, a combination pipe, an outer sleeve, a pipe end block and a heat-insulating support column; the combination pipe is sleeved on the metal pipe, and is composed of a plurality of hard pipes and a plurality of elastic hoses alternately spliced and combined; the outer sleeve is provided with a water injection hole, which is sleeved on the combination pipe; the pipe end block includes a pipe top block and a pipe bottom block, both of which are provided with a plurality of conveying channels, and a closed valve body is provided on the conveying channel for conveying exchange water, and a slurry inlet and a flue gas outlet are opened on the pipe bottom block; the heat-insulating support columns are evenly distributed in the exchange water space and the liquid space; the technical effect of high heat energy recovery efficiency and less heat waste in the flue gas is achieved by the flue gas dust removal and desulfurization waste heat recovery device.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and in particular to a flue gas dust removal, desulfurization and waste heat recovery device. Background Art

[0002] There are certain emission requirements for flue gases emitted in industrial production (such as flue gas from thermal power plants, glass furnaces, and boiler tail gases in the power sector). Among them, sulfur dioxide is one of the common pollutants. In order to control the emission of sulfur dioxide and smoke within a certain range, dust removal equipment is often used in combination with wet desulfurization technology. The flue gas is passed into a washing tower, and a liquid desulfurizer (such as limestone slurry) is used to absorb the sulfur dioxide in the flue gas. The flue gas is then dehydrated and discharged. When discharged, the flue gas will carry a large amount of heat with it (the heat of the flue gas can reach 100 to 200 degrees), resulting in energy loss and reduced energy utilization.

[0003] To address the above problems, the existing technology often uses flue gas waste heat recovery devices to improve energy utilization. The flue gas pipe is wrapped around the outer wall of the water storage barrel to heat the water in the water storage barrel and then recover the heat. This method recovers less heat and still causes a lot of energy waste to a certain extent. Summary of the Invention

[0004] The embodiment of the present application solves the technical problem that the flue gas waste heat recovery device in the prior art has low heat recovery efficiency and easily causes a large amount of heat loss in the flue gas by providing a flue gas dust removal and desulfurization waste heat recovery device. The embodiment of the present application achieves the technical effect that the flue gas dust removal and desulfurization waste heat recovery device has high heat recovery efficiency and less heat waste in the flue gas.

[0005] The embodiment of the present application provides a flue gas dust removal and desulfurization waste heat recovery device, comprising a desulfurization container, a dust removal component and a dehydration component, and also comprising a multifunctional pipe;

[0006] An exchange water inlet is provided on the side wall of the desulfurization container near the bottom, and an exchange water outlet and a flue gas inlet are provided near the top;

[0007] The multifunctional tube is spirally wound on the inner wall of the desulfurization container, and includes a metal tube, a combined tube, an outer sleeve, a tube end block and a heat-insulating support column;

[0008] The interior of the metal tube is a ventilation space;

[0009] The combined pipe is sleeved on the metal pipe and is composed of a plurality of hard pipes and a plurality of elastic hoses made of rubber material alternately spliced together;

[0010] The space between the combined tube and the metal tube is a water exchange space;

[0011] The outer sleeve is provided with a water jet hole and is sleeved on the combined pipe, and the space between the two is a liquid passage space;

[0012] The pipe end block includes a pipe top block and a pipe bottom block, both of which are provided with multiple conveying channels for conveying flue gas, exchange water and slurry. A closed valve body is provided on the conveying channel for conveying exchange water, and a slurry inlet and a flue gas outlet are provided on the pipe bottom block.

[0013] There are multiple heat-insulating support columns, which are evenly distributed in the water exchange space and the liquid passage space.

[0014] Furthermore, the heat-insulating support column includes a metal part and a rubber part, each of which occupies half of the heat-insulating support column and plays a supporting and heat-insulating role; the heat-insulating support column is in contact with the hard pipe.

[0015] Furthermore, a water-blocking one-way valve is positioned on the smoke outlet to prevent slurry from flowing back.

[0016] Furthermore, the water jet holes are oriented toward the axis of the desulfurization container, and the spacing between the water jet holes is more than 10 cm.

[0017] Furthermore, a temperature sensor is provided near the middle of the water exchange space, and the control unit can determine whether to cancel the closure of the closing valve body through the temperature sensor.

[0018] Preferably, it also includes a hole dredging component;

[0019] The hole dredging component is an insertion cone, which is a cone fixed on the elastic hose and inserted into the water ejection hole. There are multiple insertion cones, which correspond to the water ejection holes one by one, and are made of metal or non-metal.

[0020] The length of the insertion cone is greater than the length of the heat-insulating support column, and the tip thereof passes through the liquid-passing space;

[0021] When in use, the deformation of the elastic hose will drive the insertion cone to be inserted back and forth into the water injection hole, during which the water injection hole is unblocked.

[0022] Preferably, a water-blocking ball is fixed to the tip of the insertion cone. The water-blocking ball is a sphere. When the slurry is ejected from the water-jetting hole, it will first impact the water-blocking ball to form an annular water curtain and then refine the slurry.

[0023] Preferably, a plurality of long strip-shaped water guide grooves are positioned on the upper surface of the water-blocking ball. When the slurry impacts the water-blocking ball, a plurality of dispersed water columns are formed due to the water guide grooves.

[0024] Preferably, it also includes a pigging assembly;

[0025] The pipe cleaning assembly includes a sliding bent plate, a driving wheel and a cleaning brush;

[0026] The sliding curved plate is an arc-shaped plate with a C-shaped cross section, which is sleeved on the multifunctional tube. A plurality of driving wheels and cleaning brushes that can rotate under the control of the control unit are provided on the wall close to the multifunctional tube.

[0027] When in use, the rotation of the driving wheel drives the sliding bent plate to slide on the multifunctional tube, thereby scrubbing and cleaning the multifunctional tube.

[0028] Preferably, the water-blocking balls are sequentially connected by connecting elastic ropes, and the connecting elastic ropes are elastic rope bodies;

[0029] When the insertion cone is extended, the direction of the water spray will be continuously changed under the traction of the connecting elastic rope, so that the slurry will be sprayed more dispersedly.

[0030] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0031] By improving the flue gas waste heat recovery equipment in the prior art, a flue gas dust removal and desulfurization waste heat recovery device is provided, which includes a desulfurization container and a multifunctional tube arranged on the inner wall of the desulfurization container. The multifunctional tube is composed of three tube bodies, and the three tube bodies are sleeved together to form a ventilation space for conveying flue gas, an exchange water space and a liquid space for conveying slurry. Through holes are arranged at equal intervals on the outermost tube body; when in use, the water inside the exchange water space absorbs heat from the ventilation space, and the slurry in the liquid space is affected by pressure and ejected from the through holes to desulfurize the flue gas in the desulfurization container; the technical problem that the flue gas waste heat recovery device in the prior art has low heat energy recovery efficiency and easily causes a large amount of heat loss in the flue gas is effectively solved, thereby achieving the technical effect of high heat energy recovery efficiency and less heat waste in the flue gas by the flue gas dust removal and desulfurization waste heat recovery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a simplified diagram of the appearance and structure of the flue gas dust removal, desulfurization and waste heat recovery device of the present invention;

[0033] Figure 2 This is a simplified structural diagram of the multifunctional tube of the flue gas dust removal, desulfurization and waste heat recovery device of the present invention;

[0034] Figure 3 Schematic diagram of the positional relationship between the metal tube, the combined tube and the outer casing of the flue gas dust removal and desulfurization waste heat recovery device of the present invention;

[0035] Figure 4 Schematic diagram of the positional relationship between the insertion cone and the water jet hole of the flue gas dust removal, desulfurization and waste heat recovery device of the present invention;

[0036] Figure 5 This is a schematic structural diagram of the pigging assembly of the flue gas dust removal, desulfurization and waste heat recovery device of the present invention;

[0037] Figure 6 Schematic diagram of the positional relationship between the insertion cone and the water-blocking ball of the flue gas dust removal and desulfurization waste heat recovery device of the present invention;

[0038] Figure 7 Schematic diagram of the positional relationship between the insertion cone and the connecting elastic rope of the flue gas dust removal and desulfurization waste heat recovery device of the present invention;

[0039] Figure 8 This is a schematic diagram of the positional relationship between the desulfurization container and the multifunctional pipe when the desulfurization container of the flue gas dust removal and desulfurization waste heat recovery device of the present invention is tower-shaped.

[0040] In the picture:

[0041] Desulfurization container 100, smoke exhaust channel 110, exchange water outlet 120, flue gas inlet 130, exchange water inlet 140;

[0042] Multifunctional tube 200, metal tube 210, combined tube 220, hard tube 221, elastic hose 222, outer sleeve 230, water ejection hole 231, ventilation space 240, water exchange space 250, liquid flow space 260, tube end block 270, delivery channel 271, closed valve body 272, slurry inlet 273, smoke outlet 274, water-blocking one-way valve 275, thermal insulation support column 280, metal part 281, rubber part 282;

[0043] Insert cone 310, water blocking ball 320, connecting elastic rope 340;

[0044] Pipe cleaning assembly 400 , sliding bent plate 410 , driving wheel 420 , and cleaning brush 430 . DETAILED DESCRIPTION

[0045] To facilitate understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0046] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are for illustrative purposes only and do not represent the only implementation method.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains; the terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0048] The flue gas dust removal and desulfurization waste heat recovery device of the present application includes a desulfurization container 100 and a multifunctional tube 200 arranged on the inner wall of the desulfurization container 100. The multifunctional tube 200 is formed by three tube bodies being nested together to form a ventilation space 240 for conveying flue gas, an exchange water space 250 and a liquid space 260 for conveying slurry. Through holes are arranged at equal intervals on the outermost tube body; when in use, the water inside the exchange water space 250 absorbs heat from the ventilation space 240, and the slurry in the liquid space 260 is ejected from the through holes under the influence of pressure to desulfurize the flue gas in the desulfurization container 100; the technical effect of high heat energy recovery efficiency and less heat waste in the flue gas is achieved.

[0049] Example 1

[0050] like Figure 1 As shown, the flue gas dust removal, desulfurization and waste heat recovery device of the present application includes a desulfurization container 100, a dust removal component, a multifunctional pipe 200, a dehydration component, a power component and a control unit.

[0051] The desulfurization container 100 serves as a load-bearing container and is preferably box-shaped or tower-shaped with a hollow interior. A smoke exhaust channel 110 is provided on the top of the desulfurization container 100, and the smoke exhaust channel 110 is connected to the dehydration component; an exchange water inlet 140 for inputting exchange water is provided near the bottom on the side wall of the desulfurization container 100, and an exchange water outlet 120 for outputting exchange water and a flue gas inlet 130 for inputting flue gas are provided near the top; the flue gas is first dedusted by the dust removal component before entering the flue gas inlet 130; the dust removal component and the dehydration component are used for dust removal and dehydration of the flue gas, respectively, both of which are existing technologies and will not be described in detail here; the exchange water is a liquid used for heat exchange with the flue gas.

[0052] like Figure 2 and Figure 3 As shown, the multifunctional pipe 200 is a combination of multi-layer pipe bodies, spirally wound on the inner wall of the desulfurization container 100, and plays the role of heat exchange and spraying. The multifunctional pipe 200 includes a metal pipe 210, a combined pipe 220, an outer sleeve 230, a pipe end block 270 and a heat-insulating support column 280;

[0053] The metal tube 210 is a metal tube body, which is spiral in shape (such as Figure 8As shown), the interior is a ventilation space 240, and the ventilation space 240 is used to transport smoke;

[0054] The combined tube 220 is tubular in shape and is sleeved on the metal tube 210 and is the same length as the metal tube 210. The combined tube 220 is composed of a plurality of hard tubes 221 and a plurality of elastic hoses 222 alternately spliced together. The hard tubes 221 are metal or non-metal hard tubes; the elastic hoses 222 are rubber elastic hoses. The ends of the hard tubes 221 and the elastic hoses 222 are fixed together. The lengths of the hard tubes 221 and the elastic hoses 222 are both 10 to 20 centimeters. The space between the combined tube 220 and the metal tube 210 is an exchange water space 250 for transporting exchange water.

[0055] The outer sleeve 230 is sleeved on the combined pipe 220 and is the same length as the combined pipe 220. It is made of metal or plastic. The space between the outer sleeve 230 and the combined pipe 220 is a liquid passage 260 for conveying desulfurization slurry. The outer sleeve 230 is provided with water injection holes 231 at equal intervals. The water injection holes 231 are through holes and face the axis of the desulfurization container 100.

[0056] The tube end blocks 270 are block-shaped as a whole, and there are two of them, one above and one below, which serve to fix the ends of the metal tube 210, the combined tube 220 and the outer sleeve 230 while also serving as (gas and liquid) channels; the tube end blocks 270 include a tube top block and a tube bottom block, which are respectively fixed on the inner wall of the desulfurization container 100 near the top and the bottom; the tube top block and the tube bottom block are both provided with a plurality of conveying channels 271 for conveying flue gas, exchange water and slurry, which are used for conveying A closed valve body 272 is provided on the exchange water delivery channel 271, and the closed valve body 272 can close the delivery channel 271 for delivering exchange water under the control of the control unit; a slurry inlet 273 and a flue gas outlet 274 are provided on the pipe bottom block; the slurry inlet 273 is connected to the liquid pump and the liquid space 260; the flue gas outlet 274 is connected to the ventilation space 240; the liquid pump is positioned near the bottom inside the desulfurization container 100, and serves to pump the slurry into the liquid space 260.

[0057] There are multiple insulating support columns 280, which are evenly distributed in the water exchange space 250 and the liquid space 260. The main body is cylindrical or conical, and the material is metal and / or rubber. It plays the role of supporting the water exchange space 250 and the liquid space 260 to prevent direct contact between the metal tube 210 and the combined tube 220, and between the combined tube 220 and the outer sleeve 230.

[0058] Furthermore, the heat-insulating support column 280 includes a metal portion 281 and a rubber portion 282 , each of which occupies half of the heat-insulating support column 280 and plays a supporting and heat-insulating role; the heat-insulating support column 280 is in contact with the hard tube 221 .

[0059] Furthermore, in order to prevent the slurry inside the desulfurization container 100 from being sucked into the ventilation space 240 due to temperature difference after the equipment is shut down, a water-blocking one-way valve 275 is positioned on the flue gas outlet 274 to prevent the slurry from flowing back.

[0060] Preferably, the spacing between the water ejection holes 231 is greater than 10 cm.

[0061] The power assembly is used to provide power for the operation of various components of the flue gas dust removal, desulfurization and waste heat recovery device of this application, and the control unit plays a role in controlling the coordinated operation of various components of the flue gas dust removal, desulfurization and waste heat recovery device. Both are existing technologies and will not be described in detail here.

[0062] Preferably, the control unit is a combination of a programmable logic controller and control buttons.

[0063] When the flue gas dust removal, desulfurization and waste heat recovery device of the embodiment of the present application is actually in operation:

[0064] 1. Flue gas enters the ventilation space 240 from top to bottom through the flue gas inlet 130 and then exits from the flue gas outlet 274 into the interior space of the desulfurization vessel 100;

[0065] 2. The heat exchange water is intermittently delivered from the exchange water inlet 140 to the exchange water space 250 from bottom to top and then discharged from the exchange water outlet 120, while continuously exchanging heat with the flue gas in the ventilation space 240;

[0066] 3. The slurry for desulfurization is fed into the liquid passage space 260 by the action of the liquid pump and ejected from the water jet holes 231;

[0067] 4. After a certain amount of heat exchange water (enough to substantially fill the exchange water space 250) is input into the exchange water space 250, the closed valve body 272 is controlled to close the exchange water space 250. The exchange water near the metal tube 210 is rapidly heated to generate a large amount of gas, which in turn causes the elastic hose 222 to expand under pressure. When the elastic hose 222 expands, it occupies part of the liquid passage space 260, thereby affecting the water spray volume of the water injection hole 231. This saves energy to a certain extent and makes the slurry spray more dispersed, thereby increasing the contact area between the slurry and the flue gas and improving the overall desulfurization efficiency.

[0068] 5. After a specific time (preferably 20 to 80 seconds), the closed valve body 272 is controlled to cancel the closure and a fixed amount of exchange water is delivered to the exchange water space 250 again.

[0069] 6. Repeat steps 4 and 5 to continue flue gas heat recovery.

[0070] Preferably, a temperature sensor is provided near the middle of the water exchange space 250 , and the control unit can determine whether to cancel the closure of the closing valve body 272 through the temperature sensor.

[0071] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0072] The invention solves the technical problem that the flue gas waste heat recovery device in the prior art has low heat recovery efficiency and easily causes a large amount of heat loss in the flue gas, and achieves the technical effect that the flue gas dust removal and desulfurization waste heat recovery device has high heat recovery efficiency and less heat waste in the flue gas.

[0073] Example 2

[0074] Considering that when the device is actually running and used for a long time, the water ejection hole 231 is easily blocked, which affects the normal operation of the device to a certain extent. To address the above problem, the embodiment of the present application adds a hole dredging component on the basis of the above embodiment, specifically:

[0075] like Figure 4 As shown, the hole dredging component is an insertion cone 310, which is a cone fixed on the elastic hose 222 and inserted into the water ejection hole 231. There are multiple insertion cones 310, which correspond one-to-one to the water ejection holes 231 and are made of metal or non-metal. The length of the insertion cone 310 is greater than the length of the insulation support column 280, and the tip passes through the liquid space 260. During actual use, the deformation of the elastic hose 222 will drive the insertion cone 310 to reciprocate and insert into the water ejection hole 231, during which the water ejection hole 231 is dredged.

[0076] Preferably, Figure 6 As shown, a water-blocking ball 320 is fixed to the tip of the insertion cone 310. The water-blocking ball 320 is a sphere. When the slurry is ejected from the water-jet hole 231, it will first impact the water-blocking ball 320 to form an annular water curtain and then refine the slurry, increase the contact area between the slurry and the flue gas, and thus improve the overall desulfurization efficiency.

[0077] Furthermore, a plurality of long water guide grooves are positioned on the upper surface of the water-blocking ball 320 . When the slurry impacts the water-blocking ball 320 , a plurality of dispersed water columns are formed due to the water guide grooves.

[0078] Preferably, Figure 5As shown, in order to facilitate the cleaning of the multifunctional pipe 200, the flue gas dust removal, desulfurization and waste heat recovery device of the present application also includes a pipe cleaning component 400; the pipe cleaning component 400 includes a sliding bent plate 410, a driving wheel 420 and a cleaning brush 430; the sliding bent plate 410 is an arc-shaped plate body with a C-shaped cross-section, which is sleeved on the multifunctional pipe 200, and a plurality of driving wheels 420 and cleaning brushes 430 that can rotate under the control of the control unit are provided on the wall near the multifunctional pipe 200; in actual use, the rotation of the driving wheel 420 will drive the sliding bent plate 410 to slide on the multifunctional pipe 200, thereby brushing and cleaning the multifunctional pipe 200.

[0079] Preferably, Figure 7 As shown, the water-blocking balls 320 are connected in sequence by connecting elastic ropes 340. The connecting elastic ropes 340 are elastic rope bodies, preferably made of rubber. When the insertion cone 310 is extended, the water spraying direction will be continuously changed under the traction of the connecting elastic ropes 340, so that the slurry is sprayed more dispersedly and the contact area between the slurry and the flue gas is increased.

[0080] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A flue gas dust removal and desulfurization waste heat recovery device, comprising a desulfurization container (100), a dust removal component and a dehydration component, characterized in that: Also included is a multifunctional tube (200); An exchange water inlet (140) is provided on the side wall of the desulfurization container (100) near the bottom, and an exchange water outlet (120) and a flue gas inlet (130) are provided near the top. The multifunctional tube (200) is spirally wound on the inner wall of the desulfurization container (100), and comprises a metal tube (210), a combined tube (220), an outer sleeve (230), a tube end block (270), and a heat-insulating support column (280); The interior of the metal tube (210) is a ventilation space (240); The combined tube (220) is sleeved on the metal tube (210) and is formed by alternately splicing a plurality of hard tubes (221) and a plurality of elastic hoses (222) made of rubber material; The space between the combined tube (220) and the metal tube (210) is a water exchange space (250); The outer sleeve (230) is provided with a water jet hole (231) and is sleeved on the combined pipe (220), and the space between the two is a liquid passage space (260); The pipe end block (270) includes a pipe top block and a pipe bottom block, both of which are provided with multiple delivery channels (271) for delivering flue gas, exchange water, and slurry. A closed valve body (272) is provided on the delivery channel (271) for delivering exchange water. A slurry inlet (273) and a flue gas outlet (274) are provided on the pipe bottom block. There are a plurality of heat-insulating support columns (280), which are evenly distributed in the water exchange space (250) and the liquid passage space (260).

2. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 1, characterized in that: The heat-insulating support column (280) comprises a metal portion (281) and a rubber portion (282), each of which occupies half of the heat-insulating support column (280) and plays a supporting and heat-insulating role; the heat-insulating support column (280) is in contact with the hard pipe (221).

3. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 1, characterized in that: A water-blocking one-way valve (275) is positioned on the smoke outlet (274) to prevent slurry from flowing back.

4. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 1, characterized in that: The water jet holes (231) face the axis of the desulfurization container (100), and the spacing between the water jet holes (231) is more than 10 centimeters.

5. The flue gas dust removal, desulfurization and waste heat recovery device according to any one of claims 1 to 4, characterized in that: A temperature sensor is provided near the middle of the water exchange space (250), and the control unit can determine whether to cancel the closure of the closing valve body (272) through the temperature sensor.

6. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 1, characterized in that: Also included is a hole dredging assembly; The hole dredging component is an insertion cone (310), which is a cone fixed on the elastic hose (222) and inserted into the water ejection hole (231). There are multiple insertion cones (310), which correspond to the water ejection holes (231) one by one, and are made of metal or non-metal. The length of the insertion cone (310) is greater than the length of the heat-insulating support column (280), and the tip thereof passes through the liquid-passing space (260); During use, the deformation of the elastic hose (222) drives the insertion cone (310) to be inserted back and forth into the water ejection hole (231), during which the water ejection hole (231) is cleared.

7. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 6, characterized in that: A water-blocking ball (320) is fixed to the tip of the insertion cone (310). The water-blocking ball (320) is a sphere. When the slurry is ejected from the water-jetting hole (231), it will first impact the water-blocking ball (320), forming an annular water curtain and further refining the slurry.

8. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 7, characterized in that: A plurality of long strip-shaped water guide grooves are positioned on the upper surface of the water-blocking ball (320). When the slurry impacts the water-blocking ball (320), a plurality of dispersed water columns are formed due to the water guide grooves.

9. The flue gas dust removal, desulfurization and waste heat recovery device according to any one of claims 6 to 8, characterized in that: Also included is a pigging assembly (400); The pipe cleaning assembly (400) includes a sliding bent plate (410), a driving wheel (420) and a cleaning brush (430); The sliding curved plate (410) is an arc-shaped plate with a C-shaped cross section, which is sleeved on the multifunctional tube (200). A plurality of driving wheels (420) and a cleaning brush (430) capable of rotating under the control of a control unit are provided on the wall close to the multifunctional tube (200); During use, the rotation of the driving wheel (420) drives the sliding curved plate (410) to slide on the multifunctional tube (200), thereby scrubbing and cleaning the multifunctional tube (200).

10. The flue gas dust removal, desulfurization and waste heat recovery device according to claim 7 or 8, characterized in that: The water-blocking balls (320) are sequentially connected via connecting elastic ropes (340), and the connecting elastic ropes (340) are elastic rope bodies; When the insertion cone (310) is extended, the water spraying direction is continuously changed under the influence of the connecting elastic rope (340), so that the slurry is sprayed more dispersedly.

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