Simple and efficient hot alkali liquor tower for calcining furnace tail gas

Abstract

The utility model discloses a simple and efficient hot alkali liquor tower for calcining furnace tail gas. A gas distributor is fixed at the middle lower part of a cylinder body of the hot alkali liquor tower in a manner that the upper part is sealed and the lower part is opened; a first-stage washing and spraying device, a second-stage washing and spraying device, a third-stage washing and spraying device and a fourth-stage washing and spraying device are sequentially and uniformly fixed above the gas distributor in the hot alkali liquor tower barrel from bottom to top; the four stages of washing and spraying devices are the same in structure and different in mounting angle, and are horizontally and sequentially arranged by rotating 45 degrees along the central axis of the hot alkali liquor tower barrel. According to the utility model, through combined use of graded gradients of the washing and spraying devices, ascending gas can be in full contact with descending washing liquid after sequentially passing through the four stages of washing devices, and the spraying coverage rate reaches more than 300%, so that the washing efficiency is increased, and the washing effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of tail gas washing and purification, in particular to a hot caustic solution tower for calciner tail gas. Background Art

[0002] The calciner is a core device in the soda ash manufacturing process and is widely used in industries such as metallurgy, steel, and chemical engineering. During the calcination of soda ash, a large amount of high-temperature tail gas at 400 °C is generated, inevitably carrying a large amount of alkali dust and ammonia. The main components of these tail gases include carbon dioxide, water vapor, and other possible impurity gases. The generation of high-temperature tail gas has a certain impact on the environment, so the tail gas needs to be treated. After dust removal treatment, there are still some small amounts of alkali dust and ammonia that need to be removed by a hot caustic solution tower. In the hot caustic solution tower, the common method is to wash the tail gas with water and then perform filtration treatment. In this way, the water quickly becomes saturated with washing, and the water needs to be updated in a timely manner, which will cause waste of water resources. Moreover, the gas-liquid contact is poor, the efficiency is slow, and the washing effect is not good. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a simple and efficient hot caustic solution tower for calciner tail gas, with more comprehensive spraying, no dead angles and short-circuit phenomena, and high washing efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows: A simple and efficient hot caustic solution tower for calciner tail gas, including a hot caustic solution tower cylinder body, an upper head, a lower head, and a skirt support; characterized in that the gas distributor is fixed in the middle and lower part of the hot caustic solution tower cylinder body in a form with an upper seal and a lower opening; above the gas distributor in the hot caustic solution tower cylinder body, a first-stage washing spray device, a second-stage washing spray device, a third-stage washing spray device, and a fourth-stage washing spray device are sequentially and evenly fixed from bottom to top; the fourth-stage washing spray devices have the same structure and different installation angles, and are arranged horizontally and sequentially rotated by 45° along the central axis of the hot caustic solution tower cylinder body.

[0005] Furthermore, each stage of the washing spray device includes a spray pipe (9) and a nozzle (10), and the outermost nozzle of the first-stage washing spray device (8-1) is inclined 10° towards the center.

[0006] Furthermore, the lower head is connected to the hot caustic solution tower cylinder body by a convex structure and is fixed on the skirt support.

[0007] The utility model has the following beneficial effects

[0008] By combining and using the four-stage washing spray devices in a hierarchical gradient, the rising gas can fully contact the descending washing liquid in turn through the four-stage washing spray devices, and the spraying coverage rate is more than 300%, thereby increasing the washing efficiency and improving the washing effect. Brief Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the present utility model;

[0010] Figure 2 It is a top view schematic diagram of the first-stage washing spray device 8-1;

[0011] Figure 3 It is a top view schematic diagram of the second-stage washing spray device 8-2;

[0012] Figure 4 It is a schematic diagram of nozzle installation;

[0013] Figure 5 It is a schematic diagram of nozzle spray coverage;

[0014] Explanation of the reference numerals in the drawings: the hot caustic solution tower cylinder 1, the lower head 2, the skirt support 3, the upper head 4, the gas distributor 5, the gas outlet 6, the lifting lug 7, the first-stage washing spray device 8-1, the second-stage washing spray device 8-2, the third-stage washing spray device 8-3, the fourth-stage washing spray device 8-4, the spray pipe 9, the nozzle 10. Detailed Description of the Preferred Embodiment

[0015] The present utility model will be described in detail below with reference to the accompanying drawings.

[0016] As Figure 1 shown, a simple and efficient hot caustic solution tower for calcination furnace tail gas includes a hot caustic solution tower cylinder 1, a lower head 2, a skirt support 3, an upper head 4, a gas distributor 5, a gas outlet 6, and a lifting lug 7.

[0017] The lower head 2 is connected to the hot caustic solution tower cylinder 1 by a convex structure and is fixed on the skirt support 3.

[0018] The gas distributor 5 is fixed in the middle and lower part of the hot caustic solution tower cylinder 1, and a four-stage washing spray device is provided above; from bottom to top are the first-stage washing spray device 8-1, the second-stage washing spray device 8-2, the third-stage washing spray device 8-3, and the fourth-stage washing spray device 8-4; the four-stage washing spray devices have the same structure, and the heights are spaced 800 mm in sequence, and the installation angles are different. Along the central axis of the hot caustic solution tower cylinder 1, they are arranged horizontally and rotated 45° in sequence, as Figure 2 , Figure 3 shown. The inlets of the first-stage washing spray device 8-1 and the fourth-stage washing spray device 8-4 are completely opposite.

[0019] Each stage of the washing spray device includes a spray pipe 9 and a nozzle 10, and the outermost nozzle of the first-stage washing spray device 8-1 is inclined 10° towards the center, as Figure 4 shown. So that the spraying is more comprehensive and there is no dead angle and short-circuit phenomenon, and the spraying effect is as Figure 5 shown, and the overall spraying coverage rate reaches more than 300%.

[0020] The gas distributor 5 adopts a fin-type inlet distributor to allow the gas to enter the tower evenly, making the gas-liquid contact more sufficient.

[0021] The high-temperature tail gas first enters the cooling tower and enters the inner cylinder 1 of the hot caustic solution tower from below the gas distributor 5, and is successively washed by the first-stage washing spray device 8-1, the second-stage washing spray device 8-2, the third-stage washing spray device 8-3, and the fourth-stage washing spray device 8-4. Its temperature is reduced to normal temperature by water cooling and discharged from the gas outlet 6.

[0022] The water vapor in the tail gas condenses into liquid water during the cooling process, and this part of the water can be mixed with the washing liquid of impurities such as alkali dust and reused in the production process.

Claims

1. A simple and efficient hot caustic solution tower for the tail gas of a calciner, comprising a hot caustic solution tower cylinder body (1), an upper head (4), a lower head (2) and a skirt support (3); characterized in that, The gas distributor (5) is fixed in the middle and lower part of the hot caustic solution tower cylinder (1) in a form with an upper seal and a lower opening; above the gas distributor (5) in the hot caustic solution tower cylinder (1), a primary washing spray device (8-1), a secondary washing spray device (8-2), a tertiary washing spray device (8-3), and a quaternary washing spray device (8-4) are evenly fixed from bottom to top in sequence; the structures of the quaternary washing spray devices are the same, but the installation angles are different, and they are arranged in sequence by rotating 45° horizontally along the central axis of the hot caustic solution tower cylinder (1).

2. The simple and efficient hot caustic solution tower for calcination furnace tail gas according to claim 1, characterized in that, Each washing spray device includes a spray pipe (9) and a nozzle (10), and the outermost nozzle of the primary washing spray device (8-1) inclines 10° towards the center.

3. The simple and efficient hot caustic solution tower for calcination furnace tail gas according to claim 1, wherein The lower head (2) is connected to the hot caustic solution tower cylinder (1) by a convex structure and is fixed on the skirt support (3).

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