Circulating pre-filtration spray type incineration flue gas treatment device

Abstract

The present invention discloses a circulating pre-filter spray type incineration flue gas treatment device, comprising a pre-filter mechanism, a purification mechanism, a spray mechanism, a casing, a smoke inlet pipe and a smoke exhaust pipe, wherein the pre-filter mechanism comprises a filter cloth, a casing, a reel, a reel, a supporting roller and a scraper, wherein a plurality of the supporting rollers are rotatably connected to the flue, and the two ends of the filter cloth are respectively unwound and reeled by the unwound machine and the reel, and the middle section can be cyclically extended into the flue in turn and stretched out by the supporting rollers, the middle section of the filter cloth is supported by the supporting rollers in the flue and forms at least two cloth layers arranged in turn from top to bottom, a plurality of the scrapers are respectively installed in the flue and scrape the cloth layer located at the bottom, and the pre-filter mechanism regularly unwound and reeled the filter cloth by the unwound machine and the reel so that the cloth layer originally located at the bottom replaces the cloth layer originally located at the upper layer, which not only has a better overall purification effect but also has a longer service life of the filler.

Description

Technical Field

[0001] The invention relates to the technical field of combustion flue gas treatment, in particular to the technical field of circulating pre-filtration spray type incineration flue gas treatment equipment. Background Art

[0002] Waste incineration technology is a high-temperature pyrolysis treatment technology that has the characteristics of rapid and thorough waste treatment, large waste volume reduction, high energy conversion rate and good comprehensive utilization. It is a very commonly used waste treatment method. The incineration flue gas produced by waste incineration contains acidic gas components such as HCl and SO2, so it needs to be purified to a level that is harmless to the environment and human body before it can be discharged.

[0003] Wet spray tower is a kind of equipment that purifies waste gas by liquid spraying (it can be divided into water spray tower, alkali spray tower and acid spray tower according to the spray liquid, vertical spray tower and horizontal spray tower according to the shape, and fiberglass spray tower, plastic spray tower and stainless steel spray tower according to the material). It has the characteristics of high purification efficiency, large processing capacity, stable operation and convenient maintenance. Using wet spray tower to spray and wash incineration flue gas is an important means of incineration flue gas purification. Wet spray tower can remove or reduce harmful components in incineration flue gas by bringing the purification liquid into contact with the incineration flue gas (heat and mass transfer, and even chemical reaction, will occur between the gas and liquid phases).

[0004] Increasing the gas-liquid contact area can effectively improve the washing efficiency of the purification liquid on the incineration flue gas; currently, factories usually increase the liquid contact area by reducing the droplet diameter of the purification liquid (using a specific atomizing nozzle to spray the pressurized purification liquid) and adding fillers in the wet spray tower, such as the boiler flue gas processor with announcement number CN202343077U, the flue gas automatic treatment device with publication number CN115999297A and a flue gas treatment spray tower with announcement number CN211358354U; however, the composition of the incineration flue gas generated by garbage incineration is very complex. In addition to containing acidic gas components, it often also contains ash Dust and components such as hydrocarbons with longer molecular chains; this results in that after the incineration flue gas comes into contact with the purification liquid, the dust mixes with the purification liquid and produces sludge, while the hydrocarbons with longer molecular chains mix with the purification liquid and produce viscous waste; although the sludge will settle at the bottom of the wet spray tower to be discharged through the drain pipe, the remaining sludge and most of the viscous waste can easily settle on the filler and block its holes; for this reason, workers have to replace the filler frequently; this is not only time-consuming and labor-intensive, but also leads to an increase in the cost of waste gas treatment (the filler is generally a ceramic porous ball with a large specific surface area, which is difficult to clean and has a high replacement cost). Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to propose a circulating pre-filtration spray type incineration flue gas treatment device, which not only has a better overall purification effect but also has a longer service life of the filler.

[0006] To achieve the above-mentioned purpose, the present invention proposes a circulating pre-filter spray type incineration flue gas treatment device, including a pre-filter mechanism, a purification mechanism, a spray mechanism, a casing, a smoke inlet pipe and a smoke exhaust pipe, wherein the casing is respectively provided with a smoke inlet pipe and a smoke exhaust pipe at the bottom and the top so that the smoke flows from bottom to top along the flue, the purification mechanism is installed in the flue and has a filler sprayed by the spray mechanism, the pre-filter mechanism is located below the purification mechanism and has a filter cloth, a casing, an unwinder, a winder, a supporting roller and a scraper, the unwinder and the winder are arranged outside the casing through the casing, if The supporting rollers are rotatably connected in the flue, the two ends of the filter cloth are respectively unwound and wound by an unwinder and a winder, and the middle section is cyclically extended into the flue in sequence and stretched by the supporting rollers, the middle section of the filter cloth is supported by the supporting rollers in the flue and forms at least two layers of cloth arranged in sequence from top to bottom, several scrapers are respectively installed in the flue and scrape the cloth layer at the bottom, and the pre-filtering mechanism regularly unwinds and winds the filter cloth by the unwinder and the winder so that the cloth layer originally located at the bottom replaces the cloth layer originally located at the upper layer.

[0007] Preferably, the filter cloth is a fabric with a hydrophilic and oleophobic hydrogel loaded on its surface, and the filter cloth is pre-immersed in a purification liquid before operation to make the hydrophilic and oleophobic hydrogel in a swollen state.

[0008] Preferably, the hydrophilic-oleophobic hydrogel is a polyacrylamide hydrogel.

[0009] Preferably, a cloth inlet and a cloth outlet for the filter cloth to enter and exit are respectively provided between the casing and the unwinding machine, and a liquid blocking cover is provided at the cloth inlet and / or the cloth outlet.

[0010] Preferably, the filler is contained in a plurality of trough bodies, each of which has a plurality of leakage holes at its bottom and the trough cavity is separated by a plurality of partitions, and each of the trough bodies is supported by an upper convex wall located on the inner wall of the casing.

[0011] Preferably, the spray mechanism includes a coil, an atomizing nozzle, a liquid inlet pipe, a liquid return pipe, a liquid pump and a liquid tank. Coils with a plurality of atomizing nozzles are respectively provided above the filter cloth and the filler. The liquid pump pumps the purified liquid from the liquid tank into the coil through the liquid inlet pipe on the one hand and pumps the purified liquid from the flue back to the liquid tank through the liquid return pipe on the other hand.

[0012] Preferably, one end of the smoke inlet pipe is used to input combustion smoke and the other end extends into the flue and is equipped with a liquid blocking hood, the liquid blocking hood includes a hood body, connecting strips and connecting plates, the hood body is umbrella-shaped and the flared end faces the smoke exhaust port of the smoke inlet pipe, one end of the connecting plate is fixed to the hood body and the other end is indirectly connected to the smoke inlet pipe through a plurality of connecting strips.

[0013] Preferably, a defogger mechanism is installed above the purification mechanism, and the defogger mechanism includes a folding plate and a frame. Several L-shaped or Z-shaped folding plates are installed in the flue through the frame respectively, and the bending parts are arranged horizontally.

[0014] Preferably, a plurality of inspection ports opened and closed by inspection doors are provided on the shell wall of the casing, and necked portions are provided at the upper and lower ends of the casing respectively, and a mud discharge mechanism is installed at the necked portion located below, and the mud discharge mechanism includes a mud discharge pipe, a vibration motor and a solenoid valve, the top end of the mud discharge pipe is connected to the flue through the mud discharge port and the bottom end is opened and closed by the solenoid valve, and the vibration motor can drive the mud discharge pipe to vibrate.

[0015] Preferably, it also includes a detector, a plurality of which extend into the flue respectively and can measure the temperature or liquid level of the purified liquid.

[0016] Beneficial effects of the present invention:

[0017] 1) By adding a purification mechanism equipped with a filter cloth below the purification mechanism with fillers, and using a spray mechanism to spray the filter cloth and the filler with purification liquid respectively, during the period when the incineration flue gas flows through the pre-filter mechanism and the purification mechanism from bottom to top along the flue, the filter cloth soaked with the purification liquid can first use physical filtration and liquid interception to remove dust and hydrocarbons with longer molecular chains in the incineration flue gas, and then the incineration flue gas that has been preliminarily purified can further remove acidic gases during the period when it is in full contact with the filler soaked with the purification liquid. Not only is the overall purification effect better, but the service life of the filler with a relatively high purchase price can also be effectively extended, thereby reducing the purification cost of the device, reducing the frequency of workers' replacement work, and avoiding the problem of reduced purification efficiency caused by shutdown;

[0018] 2) By simultaneously connecting the chassis, unwinder, winder and supporting roller with the filter cloth, the unwinder and winder can be used to regularly unwind and wind the filter cloth, thereby realizing the automatic rotation of the working cloth section, ensuring the normal pre-filtration of the incineration flue gas, and preventing the filler from being quickly contaminated by the incineration flue gas;

[0019] 3) The filter cloth extending into the flue is supported by supporting rollers to form at least two layers of cloth, one above the other, and the supporting rollers cooperate with a number of hanging plates to synchronously complete the scraping operation of the sludge and viscous waste on the bottom layer of cloth during the cloth section rotation. The surface of the filter cloth is loaded with hydrophilic and oleophobic hydrogel, thereby ensuring the pre-filtration effect of the filter cloth from the aspects of self-antifouling and self-decontamination.

[0020] 4) By adding an upper convex wall to the inner wall of the casing to simultaneously support several troughs containing fillers, and adding several leakage holes and several partitions on each trough, the fillers installed in different parts of the flue can be replaced in batches at fixed points, effectively improving the accuracy of filler replacement and avoiding the simultaneous discharge of insufficiently contaminated fillers along with other fillers (i.e. avoiding waste).

[0021] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a front view of the first embodiment;

[0023] Figure 2 is a cross-sectional view of the first embodiment when the mud discharge mechanism is removed and the timing is detected;

[0024] Figure 3 is a schematic diagram of the coordination between the pre-filtering mechanism and the spraying mechanism of the first embodiment;

[0025] Figure 4 is a schematic diagram of the coordination between the purification mechanism and the spray mechanism of the first embodiment;

[0026] Figure 5 is a top view of the tank body of the first embodiment;

[0027] Figure 6 yes Figure 2 An enlarged schematic diagram of point A;

[0028] Figure 7 is a top view of the demisting mechanism of the first embodiment;

[0029] Figure 8 is a cross-sectional view of the second embodiment when the mud discharge mechanism is removed and the timing is detected;

[0030] Fig. 9 is a schematic diagram of the coordination between the pre-filtering mechanism and the spraying mechanism of the second embodiment;

[0031] Fig.10 It is a schematic diagram of the assembly of the filter cloth and the pressing frame of the second embodiment.

[0032] In the figure: 1-pre-filter mechanism, 11-filter cloth, 12-chassis, 13-unwinder, 14-winder, 15-support roller, 16-scraper, 17-liquid blocking cover, 18-pressing frame, 2-purification mechanism, 21-tank body, 211-partition, 212-leakage hole, 22-filler, 3-spraying mechanism, 31-coil, 32-atomizing nozzle, 33-liquid inlet pipe, 34-liquid return pipe, 4-chassis, 41-inspection port, 42-narrowing portion, 43-upper convex wall, 44-lower convex wall, 5-smoke inlet pipe, 51-hood body, 52-linking strip, 53-linking plate, 6-smoke exhaust pipe, 7-defog mechanism, 71-folding plate, 72-frame, 8-mud discharge mechanism, 81-mud discharge pipe, 82-vibration motor, 83-solenoid valve, 9-detector. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] See also Figure 2 , Figure 3 and Figure 4 The circulating pre-filter spray type incineration flue gas treatment device of the present invention comprises a pre-filter mechanism 1, a purification mechanism 2, a spray mechanism 3, a casing 4, a smoke inlet pipe 5 and a smoke exhaust pipe 6, wherein the casing 4 is respectively provided with a smoke inlet pipe 5 and a smoke exhaust pipe 6 at the bottom and the top so that the smoke flows from the bottom to the top along the flue, wherein the purification mechanism 2 is installed in the flue and has a filler 22 sprayed by the spray mechanism 3, wherein the pre-filter mechanism 1 is located below the purification mechanism 2 and has a filter cloth 11, a casing 12, an unwinder 13, a winder 14, a supporting roller 15 and a scraper 16, wherein the unwinder 13 and the winder 14 are arranged outside the casing 4 through the casing 12, and a plurality of the supporting rollers 15 are respectively rotatably connected in the flue, and the two ends of the filter cloth 11 are respectively connected by the unwinder The filter cloth 11 is unwound and rewound by the unwinding machine 13 and the rewinding machine 14, and the middle section can be cyclically extended into the flue in turn and is stretched out by each supporting roller 15. The middle section of the filter cloth 11 is supported by each supporting roller 15 in the flue and forms at least two layers of cloth arranged in sequence from top to bottom. Several scrapers 16 are respectively installed in the flue and scrape the cloth layer at the bottom. The pre-filtering mechanism 1 regularly unwinds and rewinds the filter cloth 11 through the unwinding machine 13 and the rewinding machine 14 so that the cloth layer originally located in the lower layer replaces the cloth layer originally located in the upper layer; wherein, since the unwinding machine 13 and the rewinding machine 14 are arranged outside the casing 4 through the chassis 12, it can not only prevent the incineration smoke from affecting the normal operation of the unwinding motor and the rewinding motor, but also make it more convenient for workers to disassemble and assemble the filter cloth 11 as a whole.

[0035] The filter cloth 11 is a fabric with a hydrophilic-oleophobic hydrogel loaded on its surface. The filter cloth 11 is pre-immersed in a purification liquid before operation to make the hydrophilic-oleophobic hydrogel swollen. The hydrophilic-oleophobic hydrogel is a three-dimensional network structure gel material that is both hydrophilic and oleophobic. It can swell rapidly in water and retain a large volume of water in the swollen state without dissolving (the hydrophilic-oleophobic hydrogel is composed of a water cross network that fills the gaps), and can promote the viscous waste material released from the incineration flue gas to leave the filter cloth 11 as soon as possible (the hydrophilic-oleophobic hydrogel can prevent the filter cloth 11 from being contaminated by the viscous waste oil, making it relatively easier for the viscous waste material to be scraped off by the scraper 16).

[0036] The hydrophilic and oleophobic hydrogel is a polyacrylamide hydrogel (a cross-linked polyacrylamide polymerized by using acrylamide as a monomer and N,N-methylenebisacrylamide as a cross-linking agent through light initiation or chemical initiation).

[0037] See also Figure 3 A cloth inlet and a cloth outlet for the filter cloth 11 to enter and exit are respectively provided between the casing 4 and the unwinder 13, and a liquid blocking cover 17 is provided at the cloth inlet and / or the cloth outlet (specifically, in the present embodiment, the unwinder 13 is located below the winder 14, and a liquid blocking cover 17 is provided above the cloth inlet); wherein, the liquid blocking cover 17 can prevent liquid from entering the casing 12 along the cloth inlet or the cloth outlet to a certain extent.

[0038] See also Figure 4 and Figure 5 The filler 22 is contained in a plurality of trough bodies 21 , each of which has a plurality of leakage holes 212 at its bottom and is separated by a plurality of partitions 211 . Each of the trough bodies 21 is supported by an upper convex wall 43 located on the inner wall of the casing 4 .

[0039] See also Figure 2 and Figure 4 The spray mechanism 3 includes a coil 31, an atomizing nozzle 32, a liquid inlet pipe 33, a liquid return pipe 34, a liquid pump and a liquid tank. The coil 31 with a plurality of atomizing nozzles 32 is respectively provided above the filter cloth 11 and the filler 22. The liquid pump, on the one hand, pumps the purified liquid from the liquid tank into the coil 31 through the liquid inlet pipe 33, and on the other hand, pumps the purified liquid from the flue back to the liquid tank through the liquid return pipe 34.

[0040] See also Figure 2 and Figure 6One end of the smoke inlet pipe 5 is used to input combustion smoke, while the other end extends into the flue and is equipped with a liquid blocking cover, which includes a cover body 51, a connecting strip 52 and a connecting plate 53. The cover body 51 is umbrella-shaped and the flared end faces the smoke exhaust port of the smoke inlet pipe 5. One end of the connecting plate 53 is fixed to the cover body 51 and the other end is indirectly connected to the smoke inlet pipe 5 through a plurality of connecting strips 52; wherein, the umbrella-shaped cover body 51 can not only prevent the purified liquid mixed with sludge from directly dripping into the smoke inlet pipe 5 and causing the smoke exhaust to be blocked, but also will not affect the normal discharge of the combustion smoke.

[0041] See also Figure 2 and Figure 7 A defogger mechanism 7 is also installed above the purification mechanism 2. The defogger mechanism 7 includes a folding plate 71 and a frame 72. Several L-shaped or Z-shaped folding plates 71 are installed in the flue through the frame 72 respectively, and the bending parts are arranged horizontally.

[0042] See also Figure 1 The shell wall of the casing 4 is provided with a plurality of inspection ports 41 which are opened and closed by inspection doors. The upper and lower ends of the casing 4 are respectively provided with constricted portions 42. A mud discharge mechanism 8 is installed at the constricted portion 42 located at the bottom. The mud discharge mechanism 8 includes a mud discharge pipe 81, a vibration motor 82 and a solenoid valve 83. The top of the mud discharge pipe 81 is connected to the flue through the mud discharge port and the bottom is opened and closed by the solenoid valve 83. The vibration motor 82 can drive the mud discharge pipe 81 to vibrate. When mud discharge is required, the mud discharge mechanism 8 can open the mud discharge pipe 81 through the solenoid valve 83 so that the sludge deposited at the bottom of the flue can be discharged from the casing 4 along the mud discharge pipe 81, and the vibration motor 82 can accelerate the discharge speed of the sludge by driving the mud discharge 81 to vibrate, thereby avoiding the phenomenon of sludge blocking the pipe.

[0043] See also Figure 1 , and also includes a detector 9, a plurality of the detectors 9 are respectively extended into the flue and can measure the temperature or liquid level of the purified liquid.

[0044] Working process of the present invention:

[0045] During operation, the combustion flue gas first enters the flue along the smoke inlet pipe 5, and then is discharged from the casing 4 through the smoke exhaust pipe 6 after being processed by the pre-filtering mechanism 1, the purification mechanism 2 and the defogger mechanism 7 respectively; at the same time, the purified liquid in the liquid tank can be transferred to the coil 31 under the action of the liquid pump and atomized and sprayed through each atomizing nozzle 32 to wet the filter cloth 11 or the filler 22, and the purified liquid in the flue can be pumped back to the liquid tank through the return pipe 34 under the action of the liquid pump.

[0046] The incineration flue gas entering the flue will pass through the filter cloth 11 soaked with the purification liquid in advance, so that under the filtering effect of the filter cloth 11 itself and the auxiliary interception effect of the purification liquid, the particulate impurities and hydrocarbons with longer molecular chains are filtered out on the surface of the filter cloth 11 or enter the purification liquid and gradually gather and deposit at the bottom of the smoke pipe 5 with the purification liquid (part of the acid gas in the incineration flue gas can also be neutralized in this process); then, the incineration flue gas pre-filtered by the pre-filtering mechanism 1 will be fully contacted with the purification liquid during the process of passing through the filler 22 soaked with the purification liquid, so that the acid gas is further separated from the incineration flue gas through the neutralization reaction; then, when the flue gas droplets are successively processed by the pre-filtering mechanism 1 and the purification mechanism 2, the liquid in the flue gas droplets can be attached to the folding plate 71 by colliding with the folding plate 71 at the corner, and then formed into larger droplets and fall down through the surface diffusion and gravity sedimentation, and the gas in the flue gas can be discharged to the outside through the exhaust pipe 6 after the demisting is completed.

[0047] In this embodiment, the pre-filtering mechanism 1 can periodically unwind and rewind the filter cloth 11 through the unwinding machine 13 and the rewinding machine 14 respectively so that the filter cloth 11 replaces the working section extending into the flue (such as replacing the cloth layer originally located at the lower layer with a new section of cloth, and replacing the cloth layer originally located at the lower layer with the cloth layer originally located at the upper layer); during the replacement period, each scraper 16 can also synchronously scrape off impurities from the cloth layer originally located at the lower layer, so that it can better complete the impurity removal work after moving to the upper layer; after working for a period of time, the box door can be opened to replace the filter cloth 11 as a whole roll; in addition, the inspection door can be opened and the designated trough body 21 can be taken out to replace the filler 22 therein.

[0048] Embodiment 2:

[0049] See also Figures 8 to 10 In order to reduce the manufacturing and use costs, the filter cloth 11 and the pressing frame 18 can also be used directly as the pre-filtering mechanism 1 (the inner wall of the housing 4 is provided with a lower convex wall 44, and the lower convex wall 44 can clamp the filter cloth 11 together with the pressing frame 18); the rest is the same as the first embodiment.

[0050] Working process of the present invention:

[0051] In this embodiment, if the filter cloth 11 needs to be replaced, the corresponding inspection door can be opened first, and then the pressing frame 18 can be lifted to take and place the filter cloth 11; compared with the first embodiment, this design is simpler and has a low cost.

[0052] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. Circulating pre-filtration spray type incineration flue gas treatment device, characterized by: The invention comprises a pre-filtering mechanism (1), a purification mechanism (2), a spraying mechanism (3), a casing (4), a smoke inlet pipe (5) and a smoke exhaust pipe (6); the casing (4) is provided with a smoke inlet pipe (5) and a smoke exhaust pipe (6) at the bottom and the top respectively so that smoke flows from bottom to top along the flue; the purification mechanism (2) is installed in the flue and has a filler (22) sprayed by the spraying mechanism (3); the pre-filtering mechanism (1) is located below the purification mechanism (2) and has a filter cloth (11), a casing (12), an unwinder (13), a winder (14), a supporting roller (15) and a scraper (16); the unwinder (13) and the winder (14) are connected to the casing (12) by a filter cloth (11); The plurality of supporting rollers (15) are arranged outside the casing (4) and are rotatably connected to the flue. The two ends of the filter cloth (11) are respectively unwound and rewound by the unwinding machine (13) and the rewinding machine (14), and the middle section can be cyclically extended into the flue in sequence and is stretched by the supporting rollers (15). The middle section of the filter cloth (11) is supported by the supporting rollers (15) in the flue to form at least two layers of cloth arranged in sequence from top to bottom. The plurality of scrapers (16) are respectively installed in the flue to scrape the cloth layer at the bottom. The pre-filtering mechanism (1) periodically unwinds and rewinds the filter cloth (11) through the unwinding machine (13) and the rewinding machine (14). The cloth layer originally located at the lower layer replaces the cloth layer originally located at the upper layer, the filter cloth (11) is a fabric having a hydrophilic and oleophobic hydrogel on its surface, the filter cloth (11) is pre-impregnated with a purification liquid before operation to make the hydrophilic and oleophobic hydrogel in a swollen state, the filler (22) is respectively contained in a plurality of trough bodies (21), the bottom of each of the trough bodies (21) is respectively provided with a plurality of leakage holes (212), and the trough cavity is respectively separated by a plurality of partitions (211), each of the trough bodies (21) is supported by an upper convex wall (43) located on the inner wall of the casing (4), the casing (4) is provided with a plurality of inspection ports (41) opened and closed by inspection doors, and the casing (4) is provided with a plurality of inspection ports (41) opened and closed by inspection doors. The upper and lower ends of (4) are respectively provided with constricted portions (42), and a mud discharge mechanism (8) is installed at the constricted portion (42) located at the bottom. The mud discharge mechanism (8) comprises a mud discharge pipe (81), a vibration motor (82) and a solenoid valve (83). The top end of the mud discharge pipe (81) is connected to the flue through the mud discharge port and the bottom end is switched by the solenoid valve (83). The vibration motor (82) can drive the mud discharge pipe (81) to vibrate. The hydrophilic and oleophobic hydrogel is a polyacrylamide hydrogel. A cloth inlet and a cloth outlet for the filter cloth (11) to enter and exit are respectively provided between the housing (4) and the unwinding machine (13), and a liquid blocking cover (17) is provided at the cloth inlet and / or the cloth outlet.

2. The circulating pre-filtration spray type incineration flue gas treatment device according to claim 1, characterized in that: The spray mechanism (3) comprises a coil (31), an atomizing nozzle (32), a liquid inlet pipe (33), a liquid return pipe (34), a liquid pump and a liquid tank. A coil (31) with a plurality of atomizing nozzles (32) is respectively provided above the filter cloth (11) and the filler (22). The liquid pump, on the one hand, pumps purified liquid from the liquid tank into the coil (31) through the liquid inlet pipe (33) and, on the other hand, pumps purified liquid from the flue back to the liquid tank through the liquid return pipe (34).

3. The circulating pre-filtration spray type incineration flue gas treatment device according to claim 1, characterized in that: One end of the smoke inlet pipe (5) is used to input combustion smoke, while the other end extends into the smoke duct and is equipped with a liquid blocking cover, the liquid blocking cover comprising a cover body (51), a connecting strip (52) and a connecting plate (53), the cover body (51) is umbrella-shaped and the expanded end faces the smoke exhaust port of the smoke inlet pipe (5), one end of the connecting plate (53) is fixed to the cover body (51) and the other end is indirectly connected to the smoke inlet pipe (5) through a plurality of connecting strips (52).

4. The circulating pre-filtration spray type incineration flue gas treatment device according to claim 1, characterized in that: A demisting mechanism (7) is also installed above the purification mechanism (2), and the demisting mechanism (7) comprises a folding plate (71) and a frame (72). A plurality of L-shaped or Z-shaped folding plates (71) are installed in the flue through the frame (72) and the bent portions are arranged horizontally.

5. The circulating pre-filtration spray type incineration flue gas treatment device according to claim 1, characterized in that: It also includes a detector (9), a plurality of which extend into the flue and can measure the temperature or liquid level of the purified liquid.

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