A flue gas treatment device for coal-biomass-sludge blending combustion

Abstract

The present application relates to the field of flue gas treatment, in particular to a flue gas treatment device for coal-biomass-sludge mixed combustion, comprising a support, a smoke inlet box, a smoke dust treatment box and a flue gas treatment box are sequentially installed on the top of the support from bottom to top, a smoke dust filtering assembly for filtering smoke dust and a smoke dust cleaning assembly for cleaning smoke dust are installed in the smoke dust treatment box, a dust discharge hopper is installed at the bottom of the smoke inlet box, a flue gas treatment assembly for reheating treatment of flue gas, a flue gas spraying assembly for spraying cooling and catalytic treatment of flue gas are installed in the flue gas treatment box, and a smoke discharge hood is installed at the top of the flue gas treatment box. The smoke dust particles in the flue gas are filtered by the smoke dust filtering assembly, the filtered flue gas continues to enter the inside of the flue gas treatment box upwards, the flue gas treatment assembly can perform secondary heating combustion on the flue gas, thereby burning and purifying the dioxin substances in the flue gas, and discharging from the top of the smoke discharge hood.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, specifically to a flue gas treatment device that combines coal combustion with biomass sludge co-firing. Background Technology

[0002] Sludge incineration is a mainstream technology that mixes sludge with traditional fuels (such as coal, biomass, and agricultural and forestry waste) for combustion to achieve the harmless, reduced, and resource-based utilization and disposal of sludge. However, the smoke and dust generated during the sludge co-firing process is one of the main pollutants causing atmospheric pollution. Smoke generally refers to soot, which is low-volatile organic compound produced by incomplete combustion. It is usually composed of extremely fine carbon particles and fly ash, and its particle size is generally small. Dust usually refers to fly ash and some unburned coal particles carried out by the flue gas during combustion. Its particle size is 1-100μm or larger, and it also contains a variety of harmful substances. These gases can cause great harm to the environment and human health.

[0003] Currently, the treatment of flue gas dust involves adsorption filtration using filters or activated carbon. However, after prolonged use, the accumulated dust particles reduce the filtration efficiency of the device. Furthermore, sludge contains large amounts of heavy metals such as iron, copper, and zinc, as well as chlorine. If combustion is incomplete, it can easily produce dioxin-like organic pollutants. Toxic gases such as dioxins begin to decompose at 705℃ and require temperatures above 850℃ and held for more than two seconds to complete the decomposition. If the flue gas produced during co-firing is not purified and is directly released into the atmosphere, it will cause air pollution and harm people's health. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a flue gas treatment device for coal combustion coupled with biomass sludge co-firing.

[0005] The technical solution adopted in this invention is as follows: a flue gas treatment device for coal-fired coupled biomass sludge co-firing, comprising a support frame, wherein a flue gas inlet box, a dust treatment box, and a flue gas treatment box are installed sequentially from bottom to top on the top of the support frame; the dust treatment box contains a dust filter assembly for filtering dust and a dust cleaning assembly for cleaning dust; an ash discharge hopper is installed at the bottom of the flue gas inlet box; the flue gas treatment box contains a flue gas treatment assembly for reheating flue gas and a flue gas spray assembly for spray cooling and catalytic treatment of flue gas; and a flue gas exhaust hood is installed on the top of the flue gas treatment box.

[0006] Preferably, the smoke inlet box is open at both the top and bottom, and a smoke inlet pipe is connected to one side of the smoke inlet box. An air supply pipe is connected to the other side of the smoke inlet box, and a mixing fan is installed inside the smoke inlet box via a bracket.

[0007] Preferably, the ash discharge hopper is funnel-shaped, and hinged flaps are installed on the inner walls of both sides of its top opening. The ends of the two flaps that are close to each other are free ends. When the two flaps are in a horizontal state, their free ends abut against each other. An elongated perforated plate is installed at the bottom of each of the two flaps. A flap telescopic rod is installed on the inclined surface of both sides of the ash discharge hopper. The telescopic shaft of each flap telescopic rod passes through the interior of the ash discharge hopper and is connected to the elongated perforated plate through a pin. An ash discharge pipe is connected to the bottom of the front side of the ash discharge hopper. An ash discharge auger corresponding to the ash discharge pipe is rotatably installed inside the ash discharge hopper.

[0008] Preferably, the top and bottom of the dust treatment box are both closed. The dust filtration assembly includes multiple filter cartridge mounting holes that penetrate through the bottom of the dust treatment box. The multiple filter cartridge mounting holes are distributed in a rectangular array. Each filter cartridge mounting hole is fixedly installed with a dust filter cartridge that is open at both the top and bottom. The bottom end of the dust filter cartridge is flush with the bottom surface of the dust treatment box, and the top end abuts against the top of the dust treatment box. Flue gas passage slots are penetrated through the four edges of the top of the dust treatment box.

[0009] Preferably, the dust cleaning assembly includes multiple back-blowing cleaning air rings. The back-blowing cleaning air rings are hollow inside and open on the inner side. Each back-blowing cleaning air ring is respectively sleeved and installed on the outside of one of the dust filter cartridges. The inner side of the back-blowing cleaning air ring is sealed and fitted to the outer side of the dust filter cartridge and can move axially on the outside of the dust filter cartridge. The multiple back-blowing cleaning air rings are connected by air ring connecting pipes. One of the back-blowing cleaning air rings is connected to an air supply pump through an air supply pipe. The back-blowing lifting frame located outside the multiple dust filter cartridges is slidably installed inside the dust treatment box. The inner side of the back-blowing lifting frame is fixedly connected to the multiple back-blowing cleaning air rings located on the outermost side of the rectangular array. Reciprocating screws are rotatably installed at the four corners of the dust treatment box. The four reciprocating screws are threadedly engaged with the back-blowing lifting frame.

[0010] Preferably, the top of the dust treatment box is rotatably mounted with a plurality of scraper shafts located inside each dust filter cartridge, and a cleaning scraper is fixedly mounted on the outer side of each scraper shaft by a connecting rod, and the cleaning scraper abuts against the inner wall of the dust filter cartridge;

[0011] A drive box is fixedly installed on the top of the dust treatment box. The top ends of the four reciprocating lead screws all extend upward through the top of the dust treatment box and are placed inside the drive box. The top ends of the four reciprocating lead screws are synchronously connected to each other through a lifting sprocket set. The top ends of the multiple scraper shafts all extend upward through the top of the dust treatment box and are placed inside the drive box. The top ends of the multiple scraper shafts are synchronously connected to each other through a scraper sprocket set. One of the reciprocating lead screws and one of the scraper shafts are synchronously connected to each other through a chain. A drive motor is installed inside the drive box. The output shaft of the drive motor is coaxially fixedly connected to one of the reciprocating lead screws.

[0012] Preferably, the flue gas treatment assembly includes a flue gas treatment cylinder fixedly installed inside the flue gas treatment box. The flue gas treatment cylinder has an open bottom, and a funnel-shaped smoke hood is fixedly installed on the bottom of its inner side. A flue gas heating pipe is installed on the inner side of the smoke hood. There is a gap between the top of the smoke hood and the top of the flue gas treatment cylinder. A funnel-shaped return smoke hood located outside the smoke hood is fixedly installed on the top surface inside the flue gas treatment cylinder. A spray cooling channel is formed between the smoke hood and the return smoke hood.

[0013] Preferably, a disturbance shaft located inside the smoke hood is rotatably installed in the middle of the flue gas treatment cylinder. A disturbance fan blade is installed on the outer side of the disturbance shaft. A conical platform with a conical bottom is coaxially fixed on the outer side of the top of the disturbance shaft. The bottom of the conical platform extends into the inner side of the top of the smoke hood. A return fan is coaxially fixed on the outer side of the conical platform.

[0014] Preferably, the flue gas spraying assembly includes multiple cooling nozzles installed on the inner side of the flue gas return hood, the multiple cooling nozzles being connected to water supply pipes, a catalytic cylinder being fixedly installed between the bottom of the flue gas return hood and the top of the flue gas treatment cylinder, a flue gas catalytic channel being formed between the inner side of the flue gas treatment cylinder and the outer side of the catalytic cylinder, a spiral blade being installed on the outer side of the catalytic cylinder to make the flue gas catalytic channel spiral, a catalyst spray pipe being installed in the spiral direction on the outer side of the catalytic cylinder, and a flue gas outlet being opened at the top of the flue gas treatment cylinder above the flue gas catalytic channel.

[0015] Preferably, a drain pipe communicating with the inside of the flue gas treatment cylinder is installed on the outer side of the flue gas treatment box, the drain pipe is flush with the bottom of the outer conical surface of the smoke hood, and a smoke exhaust fan is installed inside the smoke exhaust hood.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. After the flue gas enters the flue gas chamber, it rises into the dust treatment chamber and passes through the dust filter assembly to filter the dust particles in the flue gas. After long-term use, dust accumulates on the dust filter assembly, affecting its filtration effect. The dust filter assembly can be cleaned by the dust cleaning assembly to restore its filtration effect. When the dust cleaning assembly cleans the dust filter assembly, the dust particles fall into the ash discharge hopper and are discharged through the ash discharge hopper.

[0018] 2. After filtration, the flue gas continues to rise into the flue gas treatment box. The flue gas treatment components can reheat and burn the flue gas to purify the dioxins in the flue gas. After secondary combustion purification, the flue gas is cooled by the flue gas spray components and sprayed with catalyst to denitrify and desulfurize the flue gas. The flue gas after secondary treatment in the flue gas treatment box enters the exhaust hood and is discharged from the top of the exhaust hood.

[0019] 3. The flue gas inside the flue gas chamber rises and enters the interior of multiple dust filter cartridges. It is filtered through the side walls of the multiple dust filter cartridges, and the dust particles are intercepted on the inner walls of the dust filter cartridges. The flue gas then passes through the dust filter cartridges to reach the interior of the flue gas treatment box and enters the interior of the flue gas treatment box from the four flue gas passages.

[0020] 4. The high-pressure air in the back-flushing cleaning ring can blow back from the outside to the inside of the dust filter cartridge, thereby blowing off the dust accumulated inside the dust filter cartridge. Multiple back-flushing cleaning rings move up and down on the outside of the dust filter cartridge to back-flush and clean the entire dust filter cartridge, so that multiple dust filter cartridges can restore their filtration effect, and the blown-off dust falls into the ash discharge hopper.

[0021] 5. The flue gas enters the bottom edge of the fume hood and converges towards the center along its inner conical surface. As the flue gas converges towards the center along its inner conical surface, it comes into contact with the flue gas heating pipe. The temperature of the flue gas heating pipe can reach over 850℃, thus enabling secondary combustion of the flue gas. This effectively burns and purifies the dioxins in the flue gas. After secondary combustion and purification, the flue gas drifts out from the top opening of the fume hood and disperses into the return fume hood. As more and more flue gas accumulates at the top of the return fume hood, it gradually flows downward into the spray cooling channel for spray cooling and catalytic treatment. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0023] Figure 2 This is the left view of the present invention.

[0024] Figure 3 For the present invention Figure 2 A cross-sectional view at point AA.

[0025] Figure 4 For the present invention Figure 2 A three-dimensional cross-sectional view of point AA in the middle.

[0026] Figure 5 This is a three-dimensional schematic diagram of the smoke inlet box of the present invention.

[0027] Figure 6 This is a cross-sectional schematic diagram of the smoke inlet box of the present invention.

[0028] Figure 7 This is a three-dimensional schematic diagram of the dust treatment box of the present invention. Figure 1 .

[0029] Figure 8 This is a three-dimensional schematic diagram of the dust treatment box of the present invention. Figure 2 .

[0030] Figure 9 This is a three-dimensional cross-sectional view of the dust treatment box of the present invention.

[0031] Figure 10 This is a three-dimensional schematic diagram of the flue gas treatment box of the present invention. Figure 1 .

[0032] Figure 11 This is a three-dimensional schematic diagram of the flue gas treatment box of the present invention. Figure 2 .

[0033] Figure 12 This is a cross-sectional schematic diagram of the flue gas treatment box of the present invention.

[0034] In the diagram: 1. Support frame; 2. Smoke inlet box; 21. Smoke inlet pipe; 22. Air supply pipe; 23. Mixing fan;

[0035] 3. Smoke and dust treatment box; 31. Smoke and dust filter assembly; 311. Filter cartridge mounting hole; 312. Smoke and dust filter cartridge; 313. Flue gas passage trough;

[0036] 32. Smoke and dust cleaning assembly; 321. Back-blowing cleaning air ring; 322. Air ring connecting pipe; 323. Back-blowing lifting frame; 324. Reciprocating lead screw; 325. Scraper shaft; 326. Cleaning scraper;

[0037] 4. Flue gas treatment box; 41. Flue gas treatment assembly; 411. Flue gas treatment cylinder; 412. Smoke hood; 413. Smoke return hood; 414. Flue gas heating tube; 415. Disruptor shaft; 416. Disruptor fan blade; 417. Conical platform; 418. Return fan;

[0038] 42. Flue gas spray assembly; 421. Cooling nozzle; 422. Water supply pipe; 423. Catalytic converter; 424. Spiral blade; 425. Catalyst spray nozzle; 426. Flue gas outlet;

[0039] 5. Ash hopper; 51. Flip plate; 52. Long perforated plate; 53. Flip plate telescopic rod; 54. Ash discharge pipe; 55. Ash discharge auger;

[0040] 6. Smoke hood; 7. Drive box; 8. Lifting sprocket assembly; 9. Scraper sprocket assembly; 10. Chain; 11. Drive motor; 12. Drain pipe; 13. Smoke exhaust fan. Detailed Implementation

[0041] The following will refer to the appendix. Figures 1-12 The description provides a detailed description of various embodiments of the present invention.

[0042] Example 1: A flue gas treatment device for coal-fired combined with biomass sludge co-firing, as shown in the attached diagram. Figures 1-12 As shown, the system includes a support frame 1 welded from steel. From bottom to top, the top of the support frame 1 is equipped with a smoke inlet box 2, a dust treatment box 3, and a flue gas treatment box 4, all connected by bolts. Flue gas enters the smoke inlet box 2 and then flows upwards into the dust treatment box 3. The dust treatment box 3 contains a dust filter assembly 31 for filtering dust and a dust cleaning assembly 32 for cleaning dust. After entering the dust treatment box 3, the dust particles in the flue gas are filtered by the dust filter assembly 31. Over time, dust accumulates on the dust filter assembly 31, affecting its filtration efficiency. The dust cleaning assembly 32 can be used to clean the dust filter assembly 31 and restore its filtration effect.

[0043] The bottom of the smoke inlet box 2 is equipped with a dust discharge hopper 5. When the dust cleaning component 32 cleans the dust filter component 31, the dust particles fall into the dust discharge hopper 5 and are discharged through the dust discharge hopper 5.

[0044] The flue gas treatment box 4 is equipped with a flue gas treatment component 41 for reheating the flue gas and a flue gas spray component 42 for spraying and cooling the flue gas and catalytic treatment. After filtration, the flue gas continues to enter the flue gas treatment box 4. The flue gas treatment component 41 can reheat and burn the flue gas to purify the dioxins in the flue gas. After the secondary combustion purification treatment, the flue gas is cooled by the flue gas spray component 42 and sprayed with catalyst to denitrify and desulfurize the flue gas.

[0045] The top of the flue gas treatment box 4 is equipped with a smoke exhaust hood 6. The flue gas that has been treated in the flue gas treatment box 4 enters the interior of the smoke exhaust hood 6 and is discharged from the top of the smoke exhaust hood 6.

[0046] Example 2, as shown in the appendix Figure 5 , Figure 6As shown, the upper and lower ends of the smoke inlet box 2 are open, and a smoke inlet pipe 21 is connected to one side of it. The smoke inlet pipe 21 can be connected to the flue gas conveying pipeline through a flange, thereby conveying the flue gas into the smoke inlet box 2. An air supply pipe 22 is connected to the other side of the smoke inlet box 2. The air supply pipe 22 is connected to the air supply pump pipeline through a flange, which can supply air into the smoke inlet box 2 to mix the flue gas with the air. A mixing fan 23 is installed inside the smoke inlet box 2 through a bracket. When the mixing fan 23 rotates, it can promote the mixing of flue gas and air, so that the flue gas can be fully burned when it enters the flue gas treatment box 4.

[0047] Example 3, as shown in the appendix Figure 5 , Figure 6 As shown, the ash discharge hopper 5 is funnel-shaped, and two flaps 51 are hinged to the inner walls on both sides of the top opening. The ends of the two flaps 51 that are close to each other are free ends. When the two flaps 51 are in a horizontal state, their free ends abut against each other, thereby isolating the smoke inlet box 2 and the ash discharge hopper 5. When the flue gas enters the smoke inlet box 2 from the smoke inlet pipe 21, the flue gas will not enter the ash discharge hopper 5 downwards due to the isolation and obstruction of the two flaps 51. When it is necessary to clean the dust particles accumulated on the dust filter assembly 31, the two flaps 51 can be flipped downwards respectively, and the dust particles can fall into the ash discharge hopper 5.

[0048] Both flaps 51 are fitted with elongated perforated plates 52 at their bottoms. Flip-plate telescopic rods 53 are installed on the inclined surfaces of both sides of the ash discharge hopper 5. These telescopic rods 53 can be selected from pneumatic cylinders, hydraulic cylinders, or electric telescopic rods according to usage requirements. The telescopic shaft of each telescopic rod 53 extends through the interior of the ash discharge hopper 5 and is connected to the elongated perforated plate 52 via a pin. When the two telescopic rods 53 extend or retract, they can drive the two flaps 51 to open or close. The bottom of the front side of the ash discharge hopper 5 is connected to an ash discharge pipe 54. The ash discharge pipe 54 can be connected to an ash discharge conveying pipeline via a flange, thereby transporting the dust to a designated location. Alternatively, a container can be placed directly below the opening of the ash discharge pipe 54 to directly discharge the dust particles into the container. An ash discharge auger 55, corresponding to the ash discharge pipe 54, is rotatably installed inside the ash discharge hopper 5. The ash discharge auger 55 can transport the dust inside the ash discharge hopper 5 to the ash discharge pipe 54 and discharge it.

[0049] Example 4, as shown in the appendix Figures 7-9As shown, the top and bottom of the dust treatment box 3 are both closed. The dust filter assembly 31 includes multiple filter cylinder mounting holes 311 that are opened through the bottom of the dust treatment box 3. The multiple filter cylinder mounting holes 311 are arranged in a rectangular array. Each filter cylinder mounting hole 311 is fixedly installed with a dust filter cylinder 312 that is open at both the top and bottom. The side wall of the dust filter cylinder 312 is provided with filter holes or filter material. The bottom end of the dust filter cylinder 312 is flush with the bottom surface of the dust treatment box 3, and the top end abuts against the top of the dust treatment box 3. The four edges of the top of the dust treatment box 3 are provided with flue gas passage slots 313.

[0050] The flue gas inside the flue gas chamber 2 floats upward and can enter the interior of multiple dust filter cartridges 312. It is filtered by the side walls of multiple dust filter cartridges 312, and the dust particles are intercepted on the inner wall of the dust filter cartridges 312. The flue gas then passes through the dust filter cartridges 312 to reach the interior of the dust treatment box 3, and enters the interior of the flue gas treatment box 4 from the four flue gas passages 313.

[0051] Example 5, as shown in the appendix Figure 9 As shown, the dust cleaning assembly 32 includes multiple back-blowing cleaning air rings 321. The back-blowing cleaning air rings 321 are hollow inside and open on the inner side. Each back-blowing cleaning air ring 321 is respectively sleeved and installed on the outside of one of the dust filter cartridges 312. The inner side of the back-blowing cleaning air ring 321 is sealed and fitted with the outer side of the dust filter cartridge 312 and can move axially on the outside of the dust filter cartridge 312. The multiple back-blowing cleaning air rings 321 are connected by air ring connecting pipes 322. One of the back-blowing cleaning air rings 321 is connected to an air supply pump through an air supply pipe.

[0052] When the air supply pump supplies high-pressure air to one of the back-flushing cleaning air rings 321 through the air supply pipe, the high-pressure air entering the back-flushing cleaning air ring 321 can enter the other back-flushing cleaning air rings 321 through multiple air ring connecting pipes 322. The high-pressure air in the back-flushing cleaning air ring 321 can back-flush from the outside to the inside of the dust filter cartridge 312, thereby blowing off the dust accumulated on the inside of the dust filter cartridge 312. The multiple back-flushing cleaning air rings 321 can back-flush and clean the entire dust filter cartridge 312 by moving up and down on the outside of the dust filter cartridge 312, so that the multiple dust filter cartridges 312 can restore their filtration effect, and the blown-off dust falls into the ash discharge hopper 5.

[0053] The dust treatment box 3 has a back-blowing lifting frame 323 slidably installed inside, located outside multiple dust filter cartridges 312. The inner side of the back-blowing lifting frame 323 is fixedly connected to multiple back-blowing cleaning air rings 321 located on the outermost side of the rectangular array. Therefore, when the back-blowing lifting frame 323 moves up and down, it can drive the multiple back-blowing cleaning air rings 321 to move back and forth outside the multiple dust filter cartridges 312. Reciprocating screws 324 are rotatably installed at the four corners of the dust treatment box 3. The four reciprocating screws 324 are threadedly engaged with the back-blowing lifting frame 323. The four reciprocating screws 324 rotate synchronously, which can drive the back-blowing lifting frame 323 to move back and forth in the up and down direction.

[0054] Example 6, as shown in the appendix Figures 7-9 As shown, the top of the dust treatment box 3 is rotatably mounted with multiple scraper shafts 325, each located inside a dust filter cartridge 312. Each scraper shaft 325 has a cleaning scraper 326 fixedly mounted on its outer side via a connecting rod. The cleaning scraper 326 abuts against the inner wall of the dust filter cartridge 312. When multiple back-blowing cleaning air rings 321 back-blow high-pressure air into the dust filter cartridge 312 to clean the dust, the multiple scraper shafts 325 rotate synchronously. The scraper shafts 325 then drive the cleaning scrapers 326 mounted on their outer sides to move circumferentially along the inner wall of the dust filter cartridge 312, thereby scraping off the dust adhering to the inner wall of the dust filter cartridge 312.

[0055] A drive box 7 is fixedly installed on the top of the dust treatment box 3, and the flue gas treatment box 4 is installed on the top of the drive box 7. The top ends of the four reciprocating screws 324 all extend upward through the top of the dust treatment box 3 and are placed inside the drive box 7. The top ends of the four reciprocating screws 324 are connected to each other by a lifting sprocket set 8. The lifting sprocket set 8 includes lifting sprockets installed on the top ends of the four reciprocating screws 324, and a lifting chain is installed between the four lifting sprockets, so that the four reciprocating screws 324 can rotate synchronously.

[0056] The top ends of the multiple scraper shafts 325 all extend upward through the top of the dust treatment box 3 and are placed inside the drive box 7. The top ends of the multiple scraper shafts 325 are connected to each other through a scraper sprocket set 9. The scraper sprocket set 9 includes scraper sprockets mounted on the top ends of the multiple scraper shafts 325. The multiple scraper sprockets are connected to each other through a scraper chain, thereby realizing the synchronous rotation of the multiple scraper shafts 325.

[0057] One of the reciprocating screws 324 and one of the scraper shafts 325 are fixedly mounted with a sprocket at their top ends. The two sprockets are connected to each other by a chain 10. When the four reciprocating screws 324 rotate synchronously, they can drive multiple scraper shafts 325 to rotate synchronously through the chain 10, thereby achieving the effects of back-blowing cleaning and scraper cleaning. The drive box 7 is equipped with a drive motor 11, which is connected to a power supply and a controller. The output shaft of the drive motor 11 is coaxially fixedly connected to one of the reciprocating screws 324. When the drive motor 11 starts, it can drive the four reciprocating screws 324 and multiple scraper shafts 325 to rotate synchronously. Heat insulation measures should be taken on the outside of the drive motor 11.

[0058] Example 7, as shown in the appendix Figures 10-12 As shown, the flue gas treatment assembly 41 includes a flue gas treatment cylinder 411 fixedly installed inside the flue gas treatment box 4, as shown in the attached figure. Figure 11 As shown, the top and bottom of the outer side of the flue gas treatment cylinder 411 are sealed and isolated from the inner wall of the flue gas treatment box 4 by partitions. The bottom of the flue gas treatment cylinder 411 is open, and a funnel-shaped smoke hood 412 is fixedly installed on the bottom of its inner side. After the flue gas is filtered by the dust treatment box 3, it floats upward from the four flue gas channels 313 and enters the bottom edge of the smoke hood 412, and converges in the middle along its inner conical surface.

[0059] A flue gas heating pipe 414 is installed on the inner side of the fume hood 412. When the flue gas entering the fume hood 412 converges in the middle along its inner conical surface, it can come into contact with the flue gas heating pipe 414. The temperature of the flue gas heating pipe 414 can reach above 850°C, thereby enabling secondary combustion of the flue gas and effectively burning and purifying the dioxin substances in the flue gas.

[0060] There is a gap between the top of the fume hood 412 and the top of the flue gas treatment cylinder 411. A funnel-shaped return fume hood 413 located outside the fume hood 412 is fixedly installed on the top surface inside the flue gas treatment cylinder 411. A spray cooling channel is formed between the fume hood 412 and the return fume hood 413. The flue gas purified by secondary combustion drifts out from the top opening of the fume hood 412 and disperses to the inside of the return fume hood 413. When more and more flue gas gathers at the top of the return fume hood 413, the flue gas gradually enters the spray cooling channel downwards for spray cooling.

[0061] Example 8, as shown in the appendix Figures 10-12As shown, a disturbance shaft 415 is rotatably mounted in the middle of the flue gas treatment cylinder 411, located inside the smoke hood 412. A disturbance motor connected to the disturbance shaft 415 is mounted on the top of the flue gas treatment cylinder 411. The disturbance motor is connected to a power supply and a controller, and when it starts, it drives the disturbance shaft 415 to rotate. A disturbance fan blade 416 is mounted on the outer surface of the disturbance shaft 415. When the disturbance shaft 415 rotates, it drives the disturbance fan blade 416 to rotate and disturb the flue gas inside the smoke hood 412, causing the flue gas to generate a vortex rotation inside the smoke hood 412. This allows the flue gas to fully contact the flue gas heating tube 414 for secondary combustion. The flue gas is supplied to the inside of the smoke inlet box 2 through the gas supply pipe 22. Air and flue gas mix, allowing the flue gas to burn completely inside the smoke hood 412. A conical platform 417 with a conical bottom is coaxially fixed to the outer side of the top of the disturbance shaft 415. The bottom of the conical platform 417 extends into the inner side of the top of the smoke hood 412. A return fan 418 is coaxially fixed to the outer surface of the conical platform 417. The conical surface of the conical platform 417 allows the flue gas to diffuse to the area below the return fan 418. When the disturbance shaft 415 rotates, it can drive the conical platform 417 and the return fan 418 to rotate. The return fan 418 can generate a downward airflow, thereby blowing the flue gas downward into the spray cooling channel for spray cooling.

[0062] Example 9, as shown in the appendix Figure 12 As shown, the flue gas spray assembly 42 includes multiple cooling nozzles 421 installed on the inner side of the return smoke hood 413. The multiple cooling nozzles 421 are connected to a water supply pipe 422, which is connected to an external water source. Water can be supplied to the multiple cooling nozzles 421 simultaneously through the water supply pipe 422, and the water sprayed from the multiple cooling nozzles 421 can cool the flue gas inside the spray cooling channel, thus preventing the high-temperature flue gas from contacting the subsequent catalyst and directly evaporating and vaporizing the catalyst. It can also spray and filter the tiny dust particles contained in the flue gas. The wastewater generated by the spraying flows to the outer conical surface of the smoke hood 412 and collects at the bottom of the outer conical surface of the smoke hood 412.

[0063] A catalytic cylinder 423 is fixedly installed between the bottom of the flue gas return hood 413 and the top of the flue gas treatment cylinder 411. A flue gas catalytic channel is formed between the inner side of the flue gas treatment cylinder 411 and the outer side of the catalytic cylinder 423. A spiral blade 424 is installed on the outer side of the catalytic cylinder 423, making the flue gas catalytic channel spiral. A catalyst nozzle 425 is spirally installed on the outer side of the catalytic cylinder 423. The catalyst nozzle 425 is connected to a catalyst supply device. An opening is formed on the outer side of the catalyst nozzle 425. There are several catalyst nozzles. When the flue gas, after being sprayed and cooled, moves to the bottom of the flue gas return hood 413, it will enter the flue gas catalytic channel upward. Then the flue gas will spiral upward along the spiral plate 424. The catalyst nozzle 425 sprays the catalyst into the flue gas through several catalyst nozzles. After the catalyst comes into contact with the flue gas, it can perform denitrification and desulfurization treatment on the flue gas. The wastewater generated flows along the spiral plate 424 to the outer cone surface of the flue gas hood 412 and collects at the bottom of the outer cone surface of the flue gas hood 412.

[0064] The top of the flue gas treatment cylinder 411 is provided with a smoke outlet 426 located above the flue gas catalytic channel. When the flue gas after catalytic treatment rises to the top of the flue gas treatment cylinder 411, it can enter the interior of the exhaust hood 6 through the smoke outlet 426 and be discharged from the top opening of the exhaust hood 6.

[0065] Example 10, as attached Figure 12 As shown, a drain pipe 12 communicating with the inside of the flue gas treatment cylinder 411 is installed on the outer side of the flue gas treatment box 4. The drain pipe 12 is flush with the bottom of the outer conical surface of the smoke hood 412. Wastewater collected at the bottom of the outer conical surface of the smoke hood 412 can be discharged from the drain pipe 12. An exhaust fan 13 is installed inside the smoke hood 6. When the exhaust fan 13 rotates, it can quickly discharge the flue gas inside the smoke hood 6.

[0066] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A flue gas treatment device for coal-fired coupled biomass sludge co-firing, comprising a support frame (1), characterized in that, The top of the support (1) is equipped with a smoke inlet box (2), a dust treatment box (3), and a flue gas treatment box (4) from bottom to top. The dust treatment box (3) is equipped with a dust filter assembly (31) for filtering dust and a dust cleaning assembly (32) for cleaning dust. The bottom of the smoke inlet box (2) is equipped with an ash discharge hopper (5). The flue gas treatment box (4) is equipped with a flue gas treatment assembly (41) for reheating flue gas and a flue gas spray assembly (42) for spraying, cooling, and catalytic treatment of flue gas. The top of the flue gas treatment box (4) is equipped with a smoke exhaust hood (6). The flue gas treatment assembly (41) includes a flue gas treatment cylinder (411) fixedly installed inside the flue gas treatment box (4). The flue gas treatment cylinder (411) has an open bottom, and a funnel-shaped smoke hood (412) is fixedly installed on the bottom of its inner side. A flue gas heating pipe (414) is installed on the inner side of the smoke hood (412). There is a gap between the top of the smoke hood (412) and the top of the flue gas treatment cylinder (411). A funnel-shaped return smoke hood (413) located outside the smoke hood (412) is fixedly installed on the top surface inside the flue gas treatment cylinder (411). A spray cooling channel is formed between the smoke hood (412) and the return smoke hood (413); a disturbance shaft (415) located inside the smoke hood (412) is rotatably installed in the middle of the flue gas treatment cylinder (411); a disturbance fan blade (416) is installed on the outer side of the disturbance shaft (415); a conical platform (417) with a conical bottom is coaxially fixed on the outer side of the top of the disturbance shaft (415); the bottom of the conical platform (417) extends into the inner side of the top of the smoke hood (412); and a return fan (418) is coaxially fixed on the outer side of the conical platform (417). The flue gas spray assembly (42) includes multiple cooling nozzles (421) installed on the inner side of the flue gas return hood (413). The multiple cooling nozzles (421) are connected to water supply pipes (422). A catalytic cylinder (423) is fixedly installed between the bottom of the flue gas return hood (413) and the top of the flue gas treatment cylinder (411). A flue gas catalytic channel is formed between the inner side of the flue gas treatment cylinder (411) and the outer side of the catalytic cylinder (423). A spiral blade (424) is installed on the outer side of the catalytic cylinder (423), making the flue gas catalytic channel spiral. A catalyst nozzle (425) is installed in the spiral direction on the outer side of the catalytic cylinder (423). A flue gas outlet (426) is opened at the top of the flue gas treatment cylinder (411) above the flue gas catalytic channel.

2. The flue gas treatment device for coal-fired co-firing with biomass sludge as described in claim 1, characterized in that, The upper and lower ends of the smoke inlet box (2) are open, and a smoke inlet pipe (21) is connected to one side of the smoke inlet box (2). An air supply pipe (22) is connected to the other side of the smoke inlet box (2). A mixing fan (23) is installed inside the smoke inlet box (2) through a bracket.

3. The flue gas treatment device for coal-fired co-firing with biomass sludge as described in claim 1, characterized in that, The ash discharge hopper (5) is funnel-shaped, and flaps (51) are hinged to the inner walls on both sides of the top opening. The ends of the two flaps (51) that are close to each other are free ends. When the two flaps (51) are in a horizontal state, their free ends abut against each other. The bottom of the two flaps (51) is equipped with a long hole plate (52). The left and right sides of the ash discharge hopper (5) are equipped with flap telescopic rods (53). The telescopic shaft of each flap telescopic rod (53) passes through the interior of the ash discharge hopper (5) and is connected to the long hole plate (52) by a pin. The bottom of the front side of the ash discharge hopper (5) is connected to an ash discharge pipe (54). The ash discharge auger (55) corresponding to the ash discharge pipe (54) is rotatably installed inside the ash discharge hopper (5).

4. The flue gas treatment device for coal-fired co-firing with biomass sludge as described in claim 1, characterized in that, The top and bottom of the dust treatment box (3) are closed. The dust filter assembly (31) includes multiple filter cylinder mounting holes (311) that are opened through the bottom of the dust treatment box (3). The multiple filter cylinder mounting holes (311) are arranged in a rectangular array. Each filter cylinder mounting hole (311) is fixedly installed with a dust filter cylinder (312) that is open at both the top and bottom. The bottom end of the dust filter cylinder (312) is flush with the bottom surface of the dust treatment box (3), and the top end is in contact with the top of the dust treatment box (3). The four edges of the top of the dust treatment box (3) are provided with flue gas passage slots (313).

5. The flue gas treatment device for coal-fired co-firing with biomass sludge as described in claim 4, characterized in that, The dust cleaning assembly (32) includes multiple back-blowing cleaning air rings (321). The back-blowing cleaning air rings (321) are hollow inside and open on the inner side. Each back-blowing cleaning air ring (321) is respectively sleeved and installed on the outside of one of the dust filter cartridges (312). The inner side of the back-blowing cleaning air ring (321) is sealed and fitted with the outer side of the dust filter cartridge (312) and can move axially on the outside of the dust filter cartridge (312). The multiple back-blowing cleaning air rings (321) are connected by air ring connecting pipes (322). One of the back-blowing cleaning air rings (321) is connected to an air supply pump via an air supply pipe. Inside the dust treatment box (3), a back-blowing lifting frame (323) located outside multiple dust filter cartridges (312) is slidably installed. The inner side of the back-blowing lifting frame (323) is fixedly connected to multiple back-blowing cleaning air rings (321) located on the outermost side of the rectangular array. Reciprocating screws (324) are rotatably installed at the four corners of the dust treatment box (3). All four reciprocating screws (324) are threadedly engaged with the back-blowing lifting frame (323).

6. The flue gas treatment device for coal-fired co-firing with biomass sludge as described in claim 5, characterized in that, The top of the dust treatment box (3) is rotatably mounted with a plurality of scraper shafts (325) located inside each dust filter cylinder (312). A cleaning scraper (326) is fixedly mounted on the outer side of each scraper shaft (325) by a connecting rod. The cleaning scraper (326) abuts against the inner wall of the dust filter cylinder (312). A drive box (7) is fixedly installed on the top of the dust treatment box (3). The top ends of the four reciprocating screws (324) all pass through the top of the dust treatment box (3) and are placed inside the drive box (7). The top ends of the four reciprocating screws (324) are connected to each other synchronously through a lifting sprocket group (8). The top ends of the multiple scraper shafts (325) all pass through the top of the dust treatment box (3) and are placed inside the drive box (7). The top ends of the multiple scraper shafts (325) are connected to each other synchronously through a scraper sprocket group (9). One of the reciprocating screws (324) and one of the scraper shafts (325) are connected to each other synchronously through a chain (10). A drive motor (11) is installed inside the drive box (7). The output shaft of the drive motor (11) is coaxially fixedly connected to one of the reciprocating screws (324).

7. The flue gas treatment device for coal-fired co-firing with biomass sludge as described in claim 1, characterized in that, A drain pipe (12) communicating with the inside of the flue gas treatment cylinder (411) is installed on the outer side of the flue gas treatment box (4). The drain pipe (12) is flush with the bottom of the outer conical surface of the smoke hood (412). An exhaust fan (13) is installed inside the smoke hood (6).

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