Dust removal, desulfurization and denitrification integrated device for industrial waste gas

Abstract

The invention provides an industrial waste gas dust removal, desulfurization and denitrification integrated device, which comprises a dust remover, a desulfurization and denitrification tower, slurry treatment equipment, a slurry circulating pool, a magnesium oxide feeding device and a chloric acid feeding device, and is characterized in that the desulfurization and denitrification tower comprises a waste gas inlet, a first spraying layer, a second spraying layer, a demisting layer and a waste gas outlet from bottom to top; the first spraying layer is provided with a first partition plate, a second partition plate and a third partition plate which form included angles smaller than 90 degrees with the horizontal plane, the first partition plate, the second partition plate and the third partition plate are distributed in a staggered mode, the second spraying layer is provided with a fourth partition plate and a fifth partition plate, the included angle between the fourth partition plate and the horizontal plane is smaller than 90 degrees, the fifth partition plate is parallel to the horizontal plane, and the fifth partition plate is provided with vent holes. The multiple layers of partition plates can increase the contact time and the contact area of waste gas and spraying liquid, and the oxidation absorption efficiency of nitric oxide and sulfur oxide is improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and in particular to an integrated device for dust removal, desulfurization and denitrification of industrial waste gas. Background Art

[0002] The integrated dust removal, desulfurization and denitrification device for industrial waste gas is a highly efficient flue gas purification equipment, which integrates the three functions of dust removal, desulfurization and denitrification in one, and is used to treat particulate matter, sulfur dioxide (SO2) and nitrogen oxides (NO x ) and other pollutants.

[0003] Nitrogen oxides (NO x ) content is high, and traditional selective catalytic reduction (SCR) denitrification devices sometimes find it difficult to achieve the ideal denitrification effect. Traditional flue gas desulfurization devices have unstable desulfurization effects and high energy consumption. Moreover, traditional desulfurization and denitrification are carried out separately, occupying a large area, and the desulfurization and denitrification efficiency is not high. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an integrated device for dust removal, desulfurization and denitrification of industrial waste gas.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an integrated device for dust removal, desulfurization and denitrification of industrial waste gas, comprising a dust collector, a desulfurization and denitrification tower, a slurry treatment equipment, a slurry circulation pool, a magnesium oxide feeding device and a chloric acid feeding device, the desulfurization and denitrification tower comprising a waste gas inlet, a first spray layer, a second spray layer, a demisting layer and a waste gas outlet from bottom to top, the first spray layer is provided with a first baffle, a second baffle and a third baffle with an angle less than 90° with the horizontal plane, the first baffle, the second baffle and the third baffle are staggered, the second spray layer is provided with a fourth baffle with an angle less than 90° with the horizontal plane and a fifth baffle parallel to the horizontal plane, and the fifth baffle is provided with a vent.

[0006] Preferably, the waste gas input pipe of the dust collector is connected to the coke oven flue gas outlet pipe, and the waste gas output pipe of the dust collector is connected to the waste gas inlet of the desulfurization and denitrification tower.

[0007] Preferably, first spray heads are arranged on the bottom surfaces of the first, second, third and fourth partitions, and the spray direction of the first spray heads is downward or inclined downward. Second spray heads are distributed on the bottom surface of the fifth partition, and the spray direction of the second spray heads is downward.

[0008] Preferably, a gap is left between the uppermost end of the first partition and the inner wall of the desulfurization and denitrification tower, a guide plate on a vertical horizontal plane is fixed to the lowermost end of the first partition, a gap is left between the lowermost end of the second partition and the inner wall of the desulfurization and denitrification tower, a gap is left between the uppermost end of the third partition and the inner wall of the desulfurization and denitrification tower, a baffle on a vertical horizontal plane is fixed to the uppermost end of the third partition, a connecting plate parallel to the horizontal plane is fixed to the upper end of the fourth partition, the connecting plate is fixedly connected to the inner wall of the desulfurization and denitrification tower, and a gap is left between the lowermost end of the fourth partition and the inner wall of the desulfurization and denitrification tower.

[0009] Preferably, the first spray heads of the first partition, the second partition and the third partition are all connected to the chloric acid input pipe and the slurry input pipe, the chloric acid input pipe is connected to the chloric acid feeding device, the slurry input pipe is connected to the circulation pump, and the circulation pump is connected to the slurry circulation tank, and the second spray heads of the fourth partition and the fifth partition are all connected to the magnesium oxide input pipe, and the magnesium oxide input pipe is connected to the magnesium oxide feeding device.

[0010] Preferably, the first spray layer and the second spray layer are respectively provided with an overflow pipe, the overflow pipe height of the first spray layer is lower than the height of the exhaust gas inlet, and the overflow pipe height of the second spray layer is lower than the highest point of the third partition, the overflow pipe is connected to the slurry processing equipment, and the slurry processing equipment is connected to the slurry circulation tank through the slurry input pipe.

[0011] Preferably, the first shower heads are distributed in a W-shape, the second shower heads are evenly distributed, and the vent holes and the second shower heads are staggered.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention allows the waste gas to be sequentially subjected to the oxidation and absorption treatment of chloric acid in the first spray layer, thereby improving the oxidation and absorption efficiency of nitrogen oxides and sulfur oxides, and the simultaneous desulfurization and denitrification also reduces the floor space occupied, and the alkaline solution in the second spray layer further absorbs and removes the acidic gas generated after the reaction; the waste gas inlet of the present invention is close to the bottom surface of the desulfurization and denitrification tower, the spray head is on the bottom surface of the inclined partition and sprays downward, and a plurality of inclined partitions form a continuous Z-shaped channel, which increases the contact opportunity between the spray liquid and the waste gas, and the design of the inclined partition helps to generate more eddies and turbulence, so that the mixing between the waste gas and the spray liquid is more uniform and sufficient, and the continuous Z-shaped channel helps to evenly distribute the waste gas flow to avoid the situation where the local air flow is too fast or too slow, and since the air flow direction in the Z-shaped channel is constantly changing, this helps to flush the attached The particles or scaling on the partition can be removed, thereby maintaining the smooth passage and efficient exhaust gas treatment capacity; the W-shaped distribution of the first spray head can increase the area covered by the spray liquid, improve the oxidation absorption efficiency of nitrogen oxides and sulfur oxides, and the W-shaped distribution of the spray head can produce a more complex airflow pattern, thereby enhancing the disturbance and mixing effect of the airflow. Reasonable design of the structure and spray angle of the W-shaped distribution of the spray head can reduce the splashing phenomenon of droplets during the spraying process; the present invention is provided with an overflow pipe to send all the spray liquid after use into the slurry treatment equipment, and the treated spray liquid can be recycled, saving chloric acid; the present invention can remove toxic trace metal elements such as As, Be, Cd, Cr, Ph, Hg and Se while desulfurizing and denitrifying, and does not need to use chemical redox agents, avoiding the problem of catalyst poisoning or deactivation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to the present invention.

[0014] Figure 2 This is an AA cross-sectional view of an integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to the present invention.

[0015] Figure 3 This is a BB cross-sectional view of an integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to the present invention.

[0016] Description of the drawings: 1. Dust collector, 11. Waste gas input pipe, 12. Waste gas output pipe, 2. Desulfurization and denitrification tower, 21. Waste gas inlet, 22. First spray layer, 221. First spray head, 222. First partition, 223. Second partition, 224. Third partition, 225. Baffle, 226. Guide plate, 23. Second spray layer, 231. Second spray head, 232. Fourth partition, 233. Fifth partition, 234. Vent, 235. Connecting plate, 24. Demisting layer, 25. Waste gas outlet, 26. Overflow pipe, 3. Slurry treatment equipment, 4. Slurry circulation pool, 41. Slurry input pipe, 42. Circulation pump, 43. Slurry input pipe, 5. Magnesium oxide feeding device, 51. Magnesium oxide input pipe, 6. Chloric acid feeding device, 61. Chloric acid input pipe. DETAILED DESCRIPTION

[0017] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0018] Please refer to Figure 1 The present invention provides an integrated device for dust removal, desulfurization and denitrification of industrial waste gas, comprising a dust collector 1, a desulfurization and denitrification tower 2, a slurry treatment equipment 3, a slurry circulation pool 4, a magnesium oxide feeding device 5 and a chloric acid feeding device 6. The desulfurization and denitrification tower 2 comprises, from bottom to top, a waste gas inlet 21, a first spray layer 22, a second spray layer 23, a demisting layer 24 and a waste gas outlet 25. The first spray layer 22 is provided with a first baffle 222, a second baffle 223 and a third baffle 224, the first baffle 222, the second baffle 223 and the third baffle 224 are staggered, leaving a continuous Z-shaped channel for the waste gas, thereby increasing the contact opportunity between the spray liquid and the waste gas. The second spray layer 23 is provided with a fourth baffle 232, the angle of which is less than 90° with the horizontal plane, and a fifth baffle 233 parallel to the horizontal plane, and the fifth baffle 233 is provided with a vent 234.

[0019] In one embodiment, if Figure 1 As shown, the waste gas input pipe 11 of the dust collector 1 is connected to the coke oven flue gas outlet pipe, and the waste gas output pipe 12 of the dust collector 1 is connected to the waste gas inlet 21 of the desulfurization and denitrification tower 2.

[0020] In one embodiment, if Figure 1 As shown, the first spray head 221 is arranged on the bottom surface of the first partition 222, the second partition 223, the third partition 224 and the fourth partition 232, and the spray direction of the first spray head 221 is downward or inclined downward. The second spray head 231 is distributed on the bottom surface of the fifth partition 233, and the spray direction of the second spray head 231 is downward.

[0021] In one embodiment, if Figure 1 and Figure 2 As shown, a gap is left between the uppermost end of the first baffle 222 and the inner wall of the desulfurization and denitrification tower 2, a guide plate 226 of a vertical horizontal plane is fixed at the lowermost end of the first baffle 222 to guide the spray liquid accumulated in the first spray layer 22 to the bottom of the tower, a gap is left between the lowermost end of the second baffle 223 and the inner wall of the desulfurization and denitrification tower 2, a gap is left between the uppermost end of the third baffle 224 and the inner wall of the desulfurization and denitrification tower 2, a baffle 225 of a vertical horizontal plane is fixed at the uppermost end of the third baffle 224 to prevent the spray liquid of the second spray layer 23 from falling into the lower layer and reducing the desulfurization and denitrification efficiency, a connecting plate 235 of a parallel horizontal plane is fixed at the upper end of the fourth baffle 232, the connecting plate 235 is fixedly connected to the inner wall of the desulfurization and denitrification tower 2, and a gap is left between the lowermost end of the fourth baffle 232 and the inner wall of the desulfurization and denitrification tower 2.

[0022] In one embodiment, if Figure 1 As shown, the first spray heads 221 of the first partition 222, the second partition 223 and the third partition 224 are all connected to the chloric acid input pipe 61 and the slurry input pipe 43, the chloric acid input pipe 61 is connected to the chloric acid feeding device 6, the slurry input pipe 43 is connected to the circulation pump 42, and the circulation pump 42 is connected to the slurry circulation tank 4, the second spray heads 231 of the fourth partition 232 and the fifth partition 233 are all connected to the magnesium oxide input pipe 51, and the magnesium oxide input pipe 51 is connected to the magnesium oxide feeding device 5 to further absorb and remove the acid gas generated after the reaction.

[0023] In one embodiment, if Figure 1 As shown, the first spray layer 22 and the second spray layer 23 are respectively provided with an overflow pipe 26. The overflow pipe 26 of the first spray layer 22 is lower than the height of the exhaust gas inlet 21, and the overflow pipe 26 of the second spray layer 23 is lower than the highest point of the third partition 232. The overflow pipe 26 is connected to the slurry treatment equipment 3, and the slurry treatment equipment 3 is connected to the slurry circulation pool 4 through the slurry input pipe 41. The spray liquid treated by the slurry treatment equipment 3 can be recycled, saving chloric acid.

[0024] In one embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, the first spray heads 221 are distributed in a W shape to increase the area covered by the spray liquid, the second spray heads 231 are evenly distributed, and the vent holes 234 and the second spray heads 231 are staggered.

[0025] How to use: Combined Figures 1 to 3As shown, industrial waste gas enters the dust collector 1 to remove particulate matter, and then enters the desulfurization and denitrification tower 2 through the waste gas inlet 21. The first spray head 221 of the first spray layer 22 sprays chloric acid or treated slurry. The waste gas moves upward through the gaps between the first partition plate 222, the second partition plate 223 and the third partition plate 224, and then enters the second spray layer 23, sprays magnesium oxide, and further absorbs and removes the acid gas generated after the reaction. When the spray liquid accumulates too much, it enters the slurry treatment equipment 3 through the overflow pipe 26. The treated slurry enters the slurry circulation pool 4 and is sent to the first spray head 221 of the first spray layer 22 through the circulation pump 42, thereby saving chloric acid.

[0026] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. An integrated device for dust removal, desulfurization and denitrification of industrial waste gas, characterized by: The invention comprises a dust collector, a desulfurization and denitration tower, slurry treatment equipment, a slurry circulation pool (4), a magnesium oxide feeding device (5) and a chloric acid feeding device (6). The desulfurization and denitration tower comprises, from bottom to top, an exhaust gas inlet (21), a first spray layer (22), a second spray layer (23), a demisting layer (24) and an exhaust gas outlet (25). The first spray layer (22) is provided with a first baffle (222), a second baffle (223) and a third baffle (224) with an angle less than 90° to the horizontal plane. The first baffle (222), the second baffle (223) and the third baffle (224) are arranged in a staggered manner. The second spray layer (23) is provided with a fourth baffle (232) with an angle less than 90° to the horizontal plane and a fifth baffle (233) parallel to the horizontal plane. The fifth baffle (233) is provided with a vent hole (234).

2. The integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that: The waste gas input pipe (11) of the dust collector is connected to the coke oven flue gas outlet pipe, and the waste gas output pipe (12) of the dust collector is connected to the waste gas inlet (21) of the desulfurization and denitration tower.

3. The integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that: A first spray head (221) is arranged on the bottom surfaces of the first partition plate (222), the second partition plate (223), the third partition plate (224) and the fourth partition plate (232), and the spray direction of the first spray head (221) is downward or inclined downward. A second spray head (231) is distributed on the bottom surface of the fifth partition plate (233), and the spray direction of the second spray head (231) is downward.

4. The integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that: A gap is left between the uppermost end of the first baffle (222) and the inner wall of the desulfurization and denitration tower; a guide plate (226) on a vertical horizontal plane is fixed to the lowermost end of the first baffle (222); a gap is left between the lowermost end of the second baffle (223) and the inner wall of the desulfurization and denitration tower; a gap is left between the uppermost end of the third baffle (224) and the inner wall of the desulfurization and denitration tower; a baffle (225) on a vertical horizontal plane is fixed to the uppermost end of the third baffle (224); a connecting plate (235) on a parallel horizontal plane is fixed to the upper end of the fourth baffle (232); the connecting plate (235) is fixedly connected to the inner wall of the desulfurization and denitration tower; and a gap is left between the lowermost end of the fourth baffle (232) and the inner wall of the desulfurization and denitration tower.

5. The integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that: The first spray heads (221) of the first baffle (222), the second baffle (223) and the third baffle (224) are all connected to a chloric acid input pipe (61) and a slurry input pipe (43); the chloric acid input pipe (61) is connected to a chloric acid feeding device (6); the slurry input pipe (43) is connected to a circulation pump (42); the circulation pump (42) is connected to a slurry circulation pool (4); the second spray heads (231) of the fourth baffle (232) and the fifth baffle (233) are all connected to a magnesium oxide input pipe (51); and the magnesium oxide input pipe (51) is connected to a magnesium oxide feeding device (5).

6. The integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to claim 1, characterized in that: The first spray layer (22) and the second spray layer (23) are respectively provided with an overflow pipe (26); the overflow pipe (26) of the first spray layer (22) is lower than the height of the exhaust gas inlet (21); the overflow pipe (26) of the second spray layer (23) is lower than the highest point of the third partition plate (232); the overflow pipe (26) is connected to a slurry processing device; and the slurry processing device is connected to a slurry circulation pool (4) via a slurry input pipe (41).

7. The integrated device for dust removal, desulfurization and denitrification of industrial waste gas according to claim 3, characterized in that: The first spray heads (221) are distributed in a W-shape, the second spray heads (231) are evenly distributed, and the vent holes (234) and the second spray heads (231) are distributed in an alternating manner.

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