Boiler flue gas purification device

Abstract

The utility model relates to the technical field of boiler flue gas treatment, in particular to a boiler flue gas purification device which comprises a purification box, a primary purification mechanism, a secondary purification mechanism, a tertiary purification mechanism and a recovery mechanism. An air inlet is formed in the lower portion of the primary purification cavity, an air outlet is formed in the upper portion of the tertiary purification cavity, and an air passing opening is formed in the partition plate close to the tertiary purification cavity. And the primary purification mechanism comprises a gas distributor which is connected with the gas inlet and is used for uniformly distributing the flue gas, and a pesticide spraying assembly which is arranged at the upper part of the primary purification chamber and is used for spraying ammonia water. According to the utility model, three purification modes are designed to fully purify sulfur-containing and nitrate-containing substances in the flue gas, so that the sulfur-containing and nitrate-containing substances are completely purified, pollutants are prevented from being discharged, the environment is prevented from being polluted, and the problem of insufficient purification of the flue gas of the boiler in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue gas treatment, in particular to a boiler flue gas purification device. Background Art

[0002] The coal burned in the boiler will produce a large amount of waste gas containing sulfur and nitrogen. The flue gas that uses coal as fuel contains these substances, especially in thermal power plants. Now, when building thermal power plants, desulfurization and denitrification equipment must be built at the same time to deal with these waste gases containing large amounts of sulfur and nitrogen.

[0003] The flue gas desulfurization and denitrification device of an industrial boiler usually consists of the following main components: a flue gas pretreatment system, a flue gas desulfurization system, a flue gas denitrification system, and a control system. The desulfurization and denitrification systems are generally set together to treat the flue gas together. The treated flue gas still contains pollutants that have not been completely converted, so it is easy to cause insufficient flue gas treatment and cause pollution. In addition, when the desulfurization system is working, the catalyst is generally fixed on a certain panel and will not move, resulting in insufficient contact between the catalyst and the flue gas and ammonia water. The selective catalytic reduction reaction after fusion is insufficient, the catalytic efficiency is low, and it has limitations. Utility Model Content

[0004] The utility model aims to provide a boiler flue gas purification device to solve the problem of insufficient boiler flue gas purification in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a boiler flue gas purification device, comprising a purification box, a primary purification mechanism, a secondary purification mechanism for purifying the flue gas purified by the primary purification mechanism again, a tertiary purification mechanism for purifying the flue gas for a third time, and a recovery mechanism for collecting used ammonia water, two partition plates are provided in the middle of the purification box, which divide the purification box into a primary purification chamber and a tertiary purification chamber, an air inlet is provided at the lower part of the primary purification chamber, an air outlet is provided at the upper part of the tertiary purification chamber, and an air outlet is provided on the partition plate close to the tertiary purification chamber, the primary purification mechanism comprises a gas distributor connected to the air inlet to make the flue gas evenly distributed, and a spray assembly arranged on the upper part of the primary purification chamber for spraying ammonia water.

[0006] The working principle of this scheme is as follows: the boiler flue gas enters the purification box from the air inlet, and evenly enters the primary purification chamber through the gas distributor. At this time, ammonia water is sprayed through the spray component, which collides and contacts with the flue gas entering from below to purify the sulfur-containing and nitrate-containing substances and solid particles in the flue gas. The flue gas after preliminary purification enters the secondary purification mechanism for purification, and then enters the tertiary purification mechanism from the air outlet for further purification, so that the flue gas can be fully purified of the residual sulfur-containing and nitrate-containing substances in the flue gas. Finally, the completely purified flue gas is discharged from the air outlet to the next process, and the ammonia water used in the purification process is recovered by the recovery mechanism.

[0007] Preferably, the gas distributor includes an annular air inlet main pipe and an air inlet branch pipe connected to the air inlet, a fixing rod is fixedly connected to the outer side of the air inlet main pipe, and the fixing rod is detachably connected to the box wall of the purification box, a plurality of connecting pipes are connected between the air inlet main pipe and the air inlet branch pipe, and a plurality of air outlet holes are opened on the upper part of the air inlet main pipe, the connecting pipe and the air inlet branch pipe.

[0008] Preferably, the spray assembly includes a spray main pipe and at least three spray branches arranged on the top of the purification box, the spray branch pipes are fixed to the wall of the purification box, the spray main pipe is connected to the medicine tank and water pump storing ammonia water, the spray main pipe is connected to each spray branch pipe, and a plurality of evenly distributed atomizing nozzles are fixed at the bottom of each of the spray branch pipes, and the atomizing nozzles are facing downward.

[0009] Preferably, the secondary purification mechanism includes a secondary purification box located above the partition plate and an installation box located inside the secondary purification box, the bottom of the secondary purification box is connected to the area between the two partition plates, an installation box is fixed inside the secondary purification box, an air intake pipe is provided on the left side of the installation box, the air intake pipe passes through the box wall of the secondary purification box and extends into the primary purification chamber, an exhaust port is provided on the right side of the installation box, and a purification part is provided inside the installation box.

[0010] Preferably, the purification part includes a material basket arranged in an installation box, the material basket is filled with activated carbon, the top of the material basket is connected to a fixing plate, the fixing plate is detachably connected to the top of the purification box, and a sealing strip is provided between the edge of the fixing plate and the wall of the purification box.

[0011] Preferably, the tertiary purification mechanism includes an air pipe connected to the air port, a plurality of staggered rotating shafts rotatably connected to the middle of the tertiary purification chamber, and a spraying assembly for spraying ammonia water, the air pipe is provided with air holes, and a mechanical seal is provided between the rotating shaft and the wall and partition plate of the purification box, a reaction plate is fixed on each of the rotating shafts, and each of the rotating shafts is fixed with a sprocket on the outside of the purification box, a chain is mounted on the sprocket, and one of the rotating shafts is connected to a driving motor.

[0012] Preferably, the spray assembly includes a plurality of spray branches fixed to the top of the purification box and a spray main pipe connected to the spray branches, the spray main pipe is connected to a medicine tank storing ammonia water and a water pump, and a spray head is connected to the lower part of each spray branch pipe.

[0013] Preferably, the recovery mechanism includes a water collecting box located at the bottom of the purification box, and the lower parts of the primary purification chamber and the tertiary purification chamber are provided with water collecting ports, the water collecting ports are connected to the water collecting box, a water outlet pipe is provided below the water collecting box, a water pump is connected to the water outlet pipe, and a valve is installed at the outlet of the water outlet pipe.

[0014] Compared with the known public technology, the technical solution provided by the utility model has the following beneficial effects:

[0015] 1. The utility model increases the contact area between the flue gas and the ammonia water entering the purification box by arranging a gas distributor and a spraying component, so that the flue gas and the ammonia water are fully in contact, the reaction efficiency is improved, and most of the sulfur-containing and nitrate-containing substances and particulate matter are purified.

[0016] 2. The utility model purifies flue gas by arranging activated carbon to absorb the remaining sulfur-containing and nitrate-containing substances in the flue gas. By arranging a material basket and a mounting plate, the material basket containing the activated carbon can be detachably connected to the purification box. There is no need to clean out the used activated carbon and then refill the activated carbon when filling the traditional desulfurization and denitrification tower, and the activated carbon can be replaced quickly and conveniently.

[0017] 3. The utility model is provided with a rotating shaft and a reaction plate so that the ammonia water adheres to the reaction plate. The reaction plate rotates under the driving of the rotating shaft, so that the ammonia water fully contacts with the flue gas coming up from below, and purifies the residual sulfur-containing and nitrate-containing substances in the flue gas. The sulfur-containing and nitrate-containing substances in the flue gas are fully purified by setting three purification methods, so that the pollutants are avoided from being discharged and polluting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0020] Figure 3 For this utility model Figure 1 A schematic diagram of the partially enlarged structure at B in the middle;

[0021] Figure 4 For this utility model Figure 1 Schematic diagram of the CC cross-section structure;

[0022] Figure 5 For this utility model Figure 1 Schematic diagram of the DD cross-section structure.

[0023] In the figure: purification box 1, air inlet 101, partition plate 102, air outlet 103, air outlet 104, primary purification chamber 105, tertiary purification chamber 106, air inlet main pipe 201, fixing rod 202, connecting pipe 203, air inlet branch pipe 204, air outlet 205, spray main pipe 206, spray branch pipe 207, atomizing nozzle 208, secondary purification box 301, installation box 302, air inlet pipe 303, material basket 304, fixing plate 305, exhaust port 306, air pipe 401, rotating shaft 402, reaction plate 403, spray branch pipe 404, spray main pipe 405, nozzle 406, air hole 407, water collecting box 501, water collecting port 502, water outlet pipe 503, valve 504. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The present invention will be further described below in conjunction with the embodiments.

[0026] like Figure 1 - Figure 5 As shown, a boiler flue gas purification device proposed by the utility model includes a square purification box 1, a primary purification mechanism located in the purification box 1 for preliminarily purifying the flue gas, a secondary purification mechanism for purifying the flue gas purified by the primary purification mechanism again, a tertiary purification mechanism for final purification, and a recovery mechanism located at the bottom of the purification box 1 for collecting used ammonia water.

[0027] An air inlet 101 is provided at the lower left portion of the purification box 1, and two partition plates 102 are provided in the middle portion of the purification box 1 to divide the purification box 1 into two left and right chambers. The two chambers are a primary purification chamber 105 on the left and a tertiary purification chamber 106 on the right, respectively. An air outlet 103 is provided at the lower portion of the right partition plate 102, and an air outlet 104 is provided at the upper right portion of the purification box 1.

[0028] The primary purification mechanism includes a gas distributor connected to the air inlet 101 and fixed in the primary purification chamber 105 by bolts, and a spraying component for spraying ammonia water fixed on the upper part of the primary purification chamber 105.

[0029] The gas distributor includes an annular air inlet main pipe 201 connected to the air inlet port 101, a fixing rod 202 is fixedly connected to the outer side of the air inlet main pipe 201, and the fixing rod 202 is fixed to the box wall of the purification box 1 by bolts. The inner side of the air inlet main pipe 201 is connected to four circumferentially distributed connecting pipes 203 connected to the air inlet main pipe 201, and the end of the connecting pipe 203 is connected to an annular air inlet branch pipe 204. The upper part of the air inlet main pipe 201, the connecting pipe 203 and the air inlet branch pipe 204 are all provided with a plurality of air outlet holes 205, so that the smoke entering the primary purification chamber 105 can be evenly distributed.

[0030] The medicine spraying assembly includes a medicine spraying main pipe 206 extending through the top wall of the purification box 1 into the primary purification chamber 105 and a row of at least three medicine spraying branch pipes 207. The upper part of the medicine spraying branch pipe 207 is fixed to the wall of the purification box 1 through a connecting rod. The medicine spraying main pipe 206 is connected to a medicine tank and a water pump for storing ammonia water. The medicine spraying main pipe 206 is connected to each medicine spraying branch pipe 207. A plurality of evenly distributed atomizing nozzles 208 are fixed to the lower part of each medicine spraying branch pipe 207. The atomizing nozzle 208 faces downward. When the flue gas entering the gas distributor moves upward, the ammonia water sprayed from the atomizing nozzle 208 collides with the flue gas to absorb sulfur-containing substances, nitrate-containing substances and some particulate matter in the flue gas.

[0031] The secondary purification mechanism includes a secondary purification box 301 located above the partition plate 102. The bottom of the secondary purification box 301 is connected to the area between the two partition plates 102. An installation box 302 is fixed inside the secondary purification box 301. An air intake pipe 303 is provided on the left side of the installation box 302. The air intake pipe 303 passes through the box wall of the secondary purification box 301. An exhaust port 306 is provided on the right side of the installation box 302. A purification part for containing activated carbon to adsorb sulfur and nitrate in the flue gas is provided in the secondary purification box 301.

[0032] The purification part includes a material basket 304 arranged in the secondary purification box 301 and a gap opened in the area of ​​the purification box 1 between the two partition plates 102. The material basket 304 is equipped with a fixing plate 305 connected to the top of the purification box 1 by bolts, and a sealing strip is provided between the edge of the fixing plate 305 and the wall of the purification box 1 for sealing.

[0033] After being purified by the primary purification mechanism, the flue gas enters the installation box 302 from the air inlet pipe 303, is purified again by the activated carbon in the material basket 304, and then goes out from the exhaust port 306 on the right side of the installation box 302, enters the secondary purification box 301, and then enters the area between the two partitions 102, and enters the tertiary purification chamber 106 from the air outlet 103.

[0034] The tertiary purification mechanism includes an air pipe 401 connected to the air port 103, and an air hole 407 is opened on the air pipe 401. A plurality of rotating shafts 402 are rotatably installed in the middle of the tertiary purification chamber 106 through bearings. Each rotating shaft 402 is sealed with the right wall of the purification box 1 and the partition plate 102 on the right side through a mechanical seal.

[0035] Four cross-distributed reaction plates 403 are fixed on each rotating shaft 402. The rotating shafts 402 are staggered and can fully contact the flue gas. Each rotating shaft 402 is fixed with a sprocket on the outside of the purification box 1, and a chain is mounted on the sprocket. One of the rotating shafts 402 is connected to a driving motor, and the driving motor drives one rotating shaft 402 to rotate, and drives the other rotating shafts 402 to rotate synchronously through the sprocket and the chain.

[0036] The tertiary purification mechanism also includes a spraying assembly located on the upper part of the tertiary purification chamber 106 for spraying ammonia water. The spraying assembly includes a row of several spraying branches 404 fixed on the inner wall of the top of the purification box 1 and a spraying main pipe 405 passing through the top of the purification box 1 and connected to the spraying branch pipe 404. The spraying main pipe 405 is connected to a medicine tank and a water pump for storing ammonia water. The lower part of each spraying branch pipe 404 is connected to a nozzle 406. Ammonia water is sprayed downward from the nozzle 406 and falls on the reaction plate 403. It rotates under the drive of the rotating shaft 402. The flue gas enters the tertiary purification chamber 106 from the air pipe 401 and fully contacts the rotating reaction plate 403. Then, it reacts and absorbs the residual sulfur-containing and nitrate-containing substances therein, and finally is discharged from the air outlet 104 to the next process.

[0037] The recovery mechanism includes a water collecting box 501 located at the bottom of the purification box 1. A water collecting port 502 is provided between the water collecting box 501 and the purification box 1, respectively, at the parts located at the primary purification chamber and the tertiary purification chamber. A water outlet pipe 503 is provided at the lower right side of the water collecting box 501. A water pump is connected to the water outlet pipe 503. A valve 504 is installed at the outlet of the water outlet pipe 503. When the recovered ammonia water in the water collecting box 501 is full, the valve 504 and the water pump are opened to send the ammonia water away for treatment.

[0038] When the utility model is working, the boiler flue gas enters the air intake main pipe 201 and the air intake branch pipe 204 from the air inlet 101, and then enters the primary purification chamber 105 in the purification box 1 from the air outlet 205. At this time, the ammonia water is sent to the spraying main pipe 206 through the water pump, and then enters the spraying branch pipe 207, and then sprayed out from the atomizing nozzle 208, colliding with the flue gas entering from below to purify the sulfur-containing and nitrate-containing substances and solid particles in the flue gas. The flue gas after preliminary purification enters the installation box 302 from the air intake pipe 303, and is purified again when passing through the activated carbon. The purified flue gas is discharged from the exhaust The ammonia enters the secondary purification box 301 from the outlet 306, flows downward, passes through the area between the two partition plates 102, enters the air pipe 401 from the air outlet 103, and then enters the tertiary evolution chamber 106 from the air hole 407. The water pump sends the ammonia water into the spray main pipe 405, and then enters the spray branch pipe 404 to be sprayed downward from the nozzle 406, falling on the reaction plate 403, and rotates under the drive of the rotating shaft 402, so that the ammonia water and the flue gas are fully contacted and reacted, and the residual sulfur-containing and nitrate-containing substances in the flue gas are purified. Finally, the completely purified flue gas is discharged from the outlet 104 to the next process.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A boiler flue gas purification device, characterized in that: The invention comprises a purification box (1), a primary purification mechanism, a secondary purification mechanism for re-purifying the flue gas purified by the primary purification mechanism, a tertiary purification mechanism for tertiary purification, and a recovery mechanism for collecting used ammonia water. Two partition plates (102) are provided in the middle of the purification box (1) to divide the purification box (1) into a primary purification chamber (105) and a tertiary purification chamber (106). An air inlet (101) is provided at the lower part of the primary purification chamber (105), an air outlet (104) is provided at the upper part of the tertiary purification chamber (106), and an air outlet (103) is provided on the partition plate (102) near the tertiary purification chamber (106). The primary purification mechanism comprises a gas distributor connected to the air inlet (101) to evenly distribute the flue gas, and a spraying component arranged at the upper part of the primary purification chamber (105) for spraying ammonia water.

2. The boiler flue gas purification device according to claim 1, characterized in that: The gas distributor comprises an annular main inlet pipe (201) and an inlet branch pipe (204) connected to the air inlet port (101); a fixing rod (202) is fixedly connected to the outer side of the main inlet pipe (201); the fixing rod (202) is detachably connected to the wall of the purification box (1); a plurality of connecting pipes (203) are connected between the main inlet pipe (201) and the inlet branch pipe (204); and a plurality of air outlet holes (205) are provided on the upper parts of the main inlet pipe (201), the connecting pipe (203) and the inlet branch pipe (204).

3. The boiler flue gas purification device according to claim 2, characterized in that: The medicine spraying assembly comprises a medicine spraying main pipe (206) arranged on the top of the purification box (1) and at least three medicine spraying branch pipes (207); the medicine spraying branch pipes (207) are fixed to the box wall of the purification box (1); the medicine spraying main pipe (206) is connected to a medicine tank and a water pump for storing ammonia water; the medicine spraying main pipe (206) is connected to each medicine spraying branch pipe (207); and a plurality of evenly distributed atomizing nozzles (208) are fixed at the bottom of each of the medicine spraying branch pipes (207); the atomizing nozzles (208) face downward.

4. The boiler flue gas purification device according to claim 1, characterized in that: The secondary purification mechanism comprises a secondary purification box (301) located above the partition plate (102) and an installation box (302) located inside the secondary purification box (301); the bottom of the secondary purification box (301) is connected to the area between the two partition plates (102); the installation box (302) is fixed inside the secondary purification box (301); an air intake pipe (303) is provided on the left side of the installation box (302); the air intake pipe (303) passes through the box wall of the secondary purification box (301) and extends into the primary purification chamber (105); an exhaust port (306) is provided on the right side of the installation box (302); and a purification unit is provided inside the installation box (302).

5. The boiler flue gas purification device according to claim 4, characterized in that: The purification section comprises a material basket (304) arranged in an installation box (302), wherein the material basket (304) contains activated carbon, and a fixing plate (305) is connected to the top of the material basket (304), wherein the fixing plate (305) is detachably connected to the top of the purification box (1), and a sealing strip is provided between the edge of the fixing plate (305) and the wall of the purification box (1).

6. The boiler flue gas purification device according to claim 1, characterized in that: The tertiary purification mechanism comprises an air pipe (401) connected to the air port (103), a plurality of staggered rotating shafts (402) rotatably connected to the middle of the tertiary purification chamber (106), and a spraying assembly for spraying ammonia water. The air pipe (401) is provided with an air hole (407). A mechanical seal is provided between the rotating shaft (402) and the wall and partition plate of the purification box (1). A reaction plate (403) is fixed to each of the rotating shafts (402). Each of the rotating shafts (402) is fixed with a sprocket on the outside of the purification box (1), and a chain is sleeved on the sprocket. One of the rotating shafts (402) is connected to a driving motor.

7. The boiler flue gas purification device according to claim 6, characterized in that: The spray assembly comprises a plurality of spray branch pipes (404) fixed to the top of the purification box (1) and a spray main pipe (405) connected to the spray branch pipes (404), wherein the spray main pipe (405) is connected to a medicine tank storing ammonia water and a water pump, and a spray head (406) is connected to the lower part of each spray branch pipe (404).

8. The boiler flue gas purification device according to any one of claims 1 to 7, characterized in that: The recovery mechanism comprises a water collecting box (501) located at the bottom of the purification box (1); the lower parts of the primary purification chamber and the tertiary purification chamber are each provided with a water collecting port (502); the water collecting port (502) is communicated with the water collecting box (501); a water outlet pipe (503) is provided below the water collecting box (501); a water pump is connected to the water outlet pipe (503); and a valve (504) is installed at the outlet of the water outlet pipe (503).

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