Cooling, dedusting and deacidifying device with small flue gas amount

Abstract

The utility model provides a small flue gas amount cooling, dedusting and deacidifying device which comprises a bag-type dust collector, a spray tower, an induced draft fan and an exhaust pipe which are connected in sequence, and is characterized by further comprising a cooling and dedusting device, the input end of the cooling and dedusting device is used for receiving flue gas, and the output end of the cooling and dedusting device is connected with the bag-type dust collector; the flue gas which is cooled by the cooling dust removal device and subjected to primary dust removal is input into the bag-type dust remover to be subjected to secondary dust removal, the cooling dust removal device is additionally arranged, the flue gas which is cooled by the cooling dust removal device and subjected to primary dust removal is input into the bag-type dust remover to be subjected to secondary dust removal, and the dust removal effect is good through two times of dust removal; meanwhile, dust is preliminarily separated through the cooling dust removal device, and the amount of dust entering the bag-type dust remover is reduced, so that the dust removal efficiency of the bag-type dust remover is improved, and the service life of the bag-type dust remover is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment, in particular to a small flue gas volume cooling, dust removal and acid removal device. Background Art

[0002] In the industrial production process, especially in the production process of chemical plants, urban waste incineration power plants and other occasions, dust-containing flue gas and acidic gases (such as HCl and SO2) will be generated. If these flue gases are directly discharged without treatment, they will cause harm to the environment and human health.

[0003] The patent document with application number 201110072922.X and publication date 2011.10.26 in China discloses a system and method for purifying tail gas from incineration of medical waste. A spray gun is used in a flue gas rapid cooling tower to rapidly cool flue gas at 400℃-600℃ to below 200℃. The cooled flue gas enters a semi-dry reactor for deacidification. The deacidified flue gas passes through a bag filter to remove dust. The flue gas after dust removal passes through a spray layer in a spray absorption tower for spray alkali washing. The flue gas after spray alkali washing passes through a demister in the spray absorption tower to remove carried droplets. The flue gas enters a steam-flue gas heat exchanger for heating and is discharged through a chimney by an induced draft fan.

[0004] The purification system only removes dust once through the bag dust collector, so the dust removal effect is poor. At the same time, since the flue gas carrying dust is directly input into the bag dust collector for dust removal, a large amount of dust is accumulated in the bag dust collector after being separated from the flue gas, which will reduce the dust removal efficiency of the bag dust collector. Utility Model Content

[0005] The utility model provides a small flue gas cooling dust removal and deacidification device, in which a cooling dust removal device is additionally provided, and the flue gas cooled and preliminarily dusted by the cooling dust removal device is input into a bag dust collector for further dust removal. Through the two dust removals, the dust removal effect is good, and at the same time, the dust is preliminarily separated by the cooling dust removal device, and the amount of dust entering the bag dust collector is reduced, thereby improving the dust removal efficiency of the bag dust collector and extending the service life of the bag dust collector.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a small flue gas cooling dust removal and deacidification device, including a bag dust collector, a spray tower, an induced draft fan and an exhaust pipe connected in sequence, and also includes a cooling dust removal device, the input end of the cooling dust removal device is used to receive the flue gas, and the output end of the cooling dust removal device is connected to the bag dust collector. The flue gas cooled and preliminarily dust-removed by the cooling dust removal device is input into the bag dust collector for further dust removal.

[0007] The spray tower comprises a tower body, a discharge port is arranged at the top of the tower body, an air inlet is arranged at the bottom of the tower body, a demister and more than two groups of deacidification devices are arranged in sequence inside the tower body from the top of the tower body to the bottom of the tower body, the more than two groups of deacidification devices are distributed at intervals along the height direction of the tower body, the deacidification device comprises a packing layer and a spray pipe arranged above the packing layer, the spray pipe is provided with more than two spray nozzles toward the packing layer, the spray directions of adjacent spray heads are different and form an angle θ, 45°≤θ≤90°; a filter port is arranged at the bottom of the tower body, a filter screen is arranged above the filter port, the filter port is connected to a circulating water tank, and the circulating water tank is connected to the spray pipe through a circulating pump.

[0008] The above arrangement, by adding a cooling dust removal device, the flue gas cooled and preliminarily dusted by the cooling dust removal device is input into the bag dust collector for further dust removal. Through the two dust removals, the dust removal effect is good. At the same time, the dust is preliminarily separated by the cooling dust removal device, and the amount of dust entering the bag dust collector is reduced, thereby improving the dust removal efficiency of the bag dust collector and extending the service life of the bag dust collector.

[0009] In the spray tower, spray nozzles with different spraying directions are arranged, which can spray liquid in different spraying directions. The spray nozzles have a large spraying angle and can cover different areas of the packing layer, so that the liquid is evenly distributed on the packing layer, and then the exhaust gas can fully contact with the liquid in different areas of the packing layer, and the exhaust gas purification effect is good; the exhaust gas contacts with the liquid in the packing layer, increasing the contact area between the exhaust gas and the liquid, and the liquid fully reacts with the particulate matter in the exhaust gas to form sediment, which is filtered through the filter screen, and the filtered liquid is circulated through the circulating water tank and the circulating pump to act on the exhaust gas again, so as to purify the exhaust gas and separate the harmful substances in the exhaust gas from the gas.

[0010] Furthermore, there are more than three spray heads, namely a first spray head, a second spray head and a third spray head; the first spray head is vertically arranged on the spray pipe, and the second spray head and the third spray head are inclinedly arranged on the spray pipe.

[0011] With the above arrangement, the second spray nozzle and the third spray nozzle spray the liquid onto the packing layer in an inclined direction, and the first spray nozzle sprays the liquid onto the packing layer in a vertical direction; the first spray nozzle, the second spray nozzle and the third spray nozzle can spray the liquid in different directions.

[0012] Furthermore, the inclination directions of the second spray head and the third spray head are opposite, and the second spray head, the first spray head and the third spray head are alternately arranged along the length direction of the spray pipe; the angle between the first spray head and the second spray head, and the angle between the first spray head and the third spray head are 45°.

[0013] With the above arrangement, the first spray nozzle, the second spray nozzle and the third spray nozzle spray liquid toward the packing layer in different directions respectively, so as to cover different areas of the packing layer with a wide coverage.

[0014] Furthermore, the cooling and dust removal device is a water-cooled cyclone dust collector.

[0015] With the above arrangement, the water-cooled cyclone dust collector integrates cooling function and dust removal function, and has good reliability.

[0016] Furthermore, the cooling and dust removal device includes a water cooling tower and a cyclone dust collector, the input end of the water cooling tower is used to receive the flue gas, the output end of the water cooling tower is connected to the input end of the cyclone dust collector, and the output end of the cyclone dust collector is connected to the bag dust collector. This has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the spray tower in the utility model.

[0019] Figure 3 It is a schematic diagram of the first spray nozzle, the second spray nozzle and the third spray nozzle in the utility model.

[0020] Figure symbols: cooling dust removal device 1, bag filter 2, spray tower 3, induced draft fan 4, exhaust pipe 5, tower body 31, demister 32, deacidification device 33, filter 34, circulating water tank 35, circulating pump 36, discharge port 311, air inlet 312, filter port 313, manhole 314, packing layer 331, spray pipe 332, first spray nozzle 333, second spray nozzle 334, third spray nozzle 335. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1-3 As shown, a small flue gas cooling dust removal and deacidification device comprises a cooling dust removal device 1, a bag dust collector 2, a spray tower 3, an induced draft fan 4 and an exhaust pipe 5 which are connected in sequence. The input end of the cooling dust removal device 1 is used to receive the flue gas, and the output end of the cooling dust removal device 1 is connected to the bag dust collector 2. The flue gas cooled and preliminarily dust-removed by the cooling dust removal device 1 is input to the bag dust collector 2 for further dust removal; then the flue gas after the second dust removal is sent to the spray tower 3 for deacidification, and then the deacidified flue gas is discharged through the exhaust pipe 5 after the action of the induced draft fan 4.

[0023] By adding a cooling dust removal device 1, the flue gas cooled and preliminarily dedusted by the cooling dust removal device 1 is input into the bag-type dust collector 2 for further dust removal. Through the two dust removals, the dust removal effect is good. At the same time, the dust is preliminarily separated by the cooling dust removal device 1, and the amount of dust entering the bag-type dust collector 2 is reduced, thereby improving the dust removal efficiency of the bag-type dust collector 2 and extending the service life of the bag-type dust collector 2.

[0024] The spray tower 3 includes a tower body 31, a discharge port 311 is provided at the top of the tower body 31, and an air inlet 312 is provided at the bottom of the tower body 31. The discharge port 311 is connected to the induced draft fan 4, and the air inlet 312 is connected to the output end of the bag filter 2. A demister 32 and two or more groups of deacidification devices 33 are sequentially provided inside the tower body 31 from the top of the tower body 31 to the bottom of the tower body 31. The two or more groups of deacidification devices 33 are spaced apart along the height direction of the tower body 31. The deacidification devices 33 include a packing layer 331 and a spray pipe 332 arranged above the packing layer 331. A filter port 313 is provided at the bottom of the tower body 31, and a filter screen 34 is provided above the filter port 313. The filter port 313 is connected to a circulating water tank 35, and the circulating water tank 35 is connected to the spray pipe 332 through a circulating pump 36.

[0025] The alkaline liquid sprayed out through the spray pipe 332 contacts with the flue gas, and the alkaline liquid fully reacts with the particulate matter in the flue gas to form sediment. The sediment accumulates at the bottom of the tower body 31 under the action of gravity, and the sediment is filtered through the filter screen 34. In this embodiment, a manhole 314 is provided near the bottom of the tower body 31. The manhole 314 is provided for inspecting the spray tower 3 and cleaning the sediment.

[0026] The filtered liquid is circulated through the circulating water tank 35 and the circulating pump 36 to react with the flue gas again, purifying the flue gas and separating the harmful substances in the flue gas from the gas. At the same time, the demister 32 removes the droplets in the flue gas, separates the gas from the liquid, and then discharges the gas.

[0027] The spray pipe 332 is provided with more than two spray nozzles facing the packing layer 331, and the spray directions of adjacent spray heads are different and form an angle θ, 45°≤θ≤90°; in the spray tower 3, spray nozzles with different spray directions are provided, which can spray liquid along different spray directions, and the spray nozzles have a large spray angle, which can cover different areas of the packing layer 331, so that the liquid is evenly distributed on the packing layer 331, and then the flue gas in different areas of the packing layer 331 can be fully contacted with the liquid, and the flue gas purification effect is good; the flue gas contacts the liquid in the packing layer 331, increasing the contact area between the flue gas and the liquid, and the liquid fully reacts with the particles in the flue gas to form sediment, which is filtered through the filter 34, and the filtered liquid is circulated through the circulating water tank 35 and the circulating pump 36 to act on the flue gas again, purifying the flue gas, and separating the harmful substances in the flue gas from the gas.

[0028] In this embodiment, the spray nozzles are provided with more than three, namely, the first spray nozzle 333, the second spray nozzle 334 and the third spray nozzle 335; the first spray nozzle 333 is vertically arranged on the spray pipe 332, and the second spray nozzle 334 and the third spray nozzle 335 are obliquely arranged on the spray pipe 332. The second spray nozzle 334 and the third spray nozzle 335 spray the liquid onto the packing layer 331 along the oblique direction, and the first spray nozzle 333 sprays the liquid onto the packing layer 331 along the vertical direction; the first spray nozzle 333, the second spray nozzle 334 and the third spray nozzle 335 can spray the liquid along different directions.

[0029] The second spray nozzle 334 and the third spray nozzle 335 are inclined in opposite directions. The second spray nozzle 334, the first spray nozzle 333 and the third spray nozzle 335 are alternately arranged along the length direction of the spray pipe 332 in sequence; the first spray nozzle 333, the second spray nozzle 334 and the third spray nozzle 335 spray liquid to the packing layer 331 in different directions respectively, and can cover different areas of the packing layer 331 with a wide coverage range. The angle between the first spray nozzle 333 and the second spray nozzle 334, and the angle between the first spray nozzle 333 and the third spray nozzle 335 are 45°. In this way, the second spray nozzle 334 and the third spray nozzle 335 have a large inclination angle relative to the first spray nozzle 333, which is convenient for the liquid to cover the edge area of ​​the packing layer 331.

[0030] The cooling dust removal device 1 is a water-cooled cyclone dust collector. In this embodiment, the water-cooled cyclone dust collector integrates cooling function and dust removal function, and has good reliability. In another embodiment, the cooling dust removal device 1 includes a water-cooling tower and a cyclone dust collector. The input end of the water-cooling tower is used to receive flue gas, the output end of the water-cooling tower is connected to the input end of the cyclone dust collector, and the output end of the cyclone dust collector is connected to the bag dust collector 2. This structure is simple. The water-cooled cyclone dust collector, water-cooling tower, and cyclone dust collector are all prior art and will not be described here.

Claims

1. A small flue gas cooling dust removal and acid removal device, comprising a bag filter, a spray tower, an induced draft fan and an exhaust pipe connected in sequence, characterized in that: It also includes a cooling dust removal device, the input end of the cooling dust removal device is used to receive the flue gas, the output end of the cooling dust removal device is connected to the bag dust collector, and the flue gas cooled and preliminarily dusted by the cooling dust removal device is input to the bag dust collector for further dust removal; The spray tower comprises a tower body, a discharge port is arranged at the top of the tower body, an air inlet is arranged at the bottom of the tower body, a demister and more than two groups of deacidification devices are arranged in sequence inside the tower body from the top of the tower body to the bottom of the tower body, the more than two groups of deacidification devices are distributed at intervals along the height direction of the tower body, the deacidification device comprises a packing layer and a spray pipe arranged above the packing layer, the spray pipe is provided with more than two spray nozzles toward the packing layer, the spray directions of adjacent spray heads are different and form an angle θ, 45°≤θ≤90°; a filter port is arranged at the bottom of the tower body, a filter screen is arranged above the filter port, the filter port is connected to a circulating water tank, and the circulating water tank is connected to the spray pipe through a circulating pump.

2. A small flue gas cooling, dust removal and acid removal device according to claim 1, characterized in that: There are more than three spray nozzles, namely a first spray nozzle, a second spray nozzle and a third spray nozzle; the first spray nozzle is vertically arranged on the spray pipe, and the second spray nozzle and the third spray nozzle are inclinedly arranged on the spray pipe.

3. A small flue gas cooling, dust removal and acid removal device according to claim 2, characterized in that: The second spray head and the third spray head have opposite inclination directions. The second spray head, the first spray head and the third spray head are alternately arranged along the length direction of the spray pipe; the angle between the first spray head and the second spray head and the angle between the first spray head and the third spray head are 45°.

4. A small flue gas cooling, dust removal and acid removal device according to claim 1, characterized in that: The cooling dust removal device is a water-cooled cyclone dust collector.

5. A small flue gas cooling, dust removal and acid removal device according to claim 1, characterized in that: The cooling and dust removal device includes a water cooling tower and a cyclone dust collector. The input end of the water cooling tower is used to receive flue gas, the output end of the water cooling tower is connected to the input end of the cyclone dust collector, and the output end of the cyclone dust collector is connected to the bag dust collector.

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