Dedusting and washing device of sodium carbonate conveying system

Abstract

The utility model discloses a dust removal washing device of a sodium carbonate conveying system. The dust removal washing device comprises a box body, an air inlet pipe, a first spraying pipe, a second spraying pipe, an observation opening, an air outlet pipe, a dry-wet partition plate, a back flushing opening and a liquid outlet. The device is characterized in that an air inlet pipe is arranged in the middle of the box body and obliquely inserted into the box body, a dry-wet partition plate is arranged in the box body, a first spraying pipe is arranged between the dry-wet partition plate and the air inlet pipe, a liquid outlet and a reverse blowing opening are formed in the bottom, and an air outlet pipe is arranged on the other side of the box body. After the device is put into use, the problem of high dust content of a dust removal system is solved, and meanwhile, the problems of reduction of washing water consumption, increase of washing liquid concentration, reduction of water carried by air outlet of an induced draft fan and scabbing of the device are basically solved as water carried by air is reduced, the vacuum degree is increased, the treatment capacity of the fan is improved, and the operation cycle of the device is greatly prolonged; and stable operation of the alkali transporting system is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of soda ash production, and particularly relates to a dust removal and washing device for a soda ash conveying system. Technical Background

[0002] Wet heavy soda ash (NaHCO 3 ) is decomposed into soda ash (Na 2 CO 3 ) through indirect heat exchange with heating pipes in a calciner. The soda ash (Na 2 CO 3 ) is transported through a conveying system, cooled, and then sent to the packaging process. The heating medium in the heating pipes of the calciner is saturated steam at 3.2 MPa (gauge pressure) and a temperature of about 260°C. At this temperature, wet heavy soda ash (NaHCO 3 ) is decomposed into water vapor, carbon dioxide, and soda ash. At the same time, part of the combined ammonia carried in the wet heavy soda ash is decomposed into free ammonia. Some of the water vapor, carbon dioxide, ammonia, and alkali dust generated by the rotation of the calciner enter the soda ash conveying system together with the soda ash (Na 2 CO 3 ). During the transportation of soda ash in the conveying system, as the temperature drops, part of the water vapor condenses, resulting in scaling in the conveying system. In severe cases, the scraper is blocked and damaged, and the system stops. Therefore, an induced draft fan is needed to extract the gas in the conveying system. Since the gas contains alkali dust, etc., it needs to be washed to recover the alkali dust, water vapor, etc. in the gas. However, the existing device uses a large amount of washing water during the recovery process, the induced draft fan outlet carries a lot of water, the dust removal device scales seriously, the operation cycle is short, and it needs to be cleaned frequently. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a dust removal and washing device for a soda ash conveying system with less washing water consumption and good washing effect.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A dust removal and washing device for a soda ash conveying system includes a box body with an inner cavity. A dry-wet partition is vertically arranged downward on the inner wall of the top of the box body. The dry-wet partition is fixedly connected to the top and side walls of the box body in a sealed manner. A gas channel is provided between the lower edge of the dry-wet partition and the bottom plate of the box body. The dry-wet partition divides the inner cavity of the box body into a first chamber and a second chamber. The first chamber and the second chamber are connected through the gas channel. An air inlet pipe is provided at the upper part of the side wall of the first chamber, and a liquid outlet is provided at the lower part. The position of the liquid outlet is lower than the lower edge of the dry-wet partition. A first spray pipe is provided at the top of the first chamber, and a nozzle is provided at the end of the spray pipe. The sprinkling area of the nozzle covers the internal space of the first chamber. An air outlet pipe is provided at the upper part of the side wall of the second chamber.

[0006] Preferably, a second spray pipe is provided in the upper part of the intake pipe.

[0007] Preferably, the intake pipe is connected to the side wall of the first chamber obliquely downward from the outside.

[0008] Preferably, a back-blowing port is provided on the inner wall of the lower part or the bottom of the side wall of the first chamber.

[0009] Preferably, an observation port is provided on the side wall of the box body.

[0010] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0011] By setting the wet and dry partition board, the gas flow path is changed, the gas residence time is prolonged, the gas-liquid contact time is increased, the washing effect is improved, the problems of low washing liquid concentration and large dust content in the gas are solved. At the same time, most of the moisture in the gas stays in the box body, reducing the water-carrying amount of the outlet gas and solving the problem of water-carrying of the fan. By setting the second spray pipe, the problem of scarring at the interface between the intake pipe and the box body is solved, and by setting the back-blowing port, the problem of unclean alkali scale in the box body is solved.

[0012] The overall effect after the commissioning of this device is as follows: the washing water consumption is small, the dust removal and washing effect is good, the washing liquid concentration is high, and at the same time, problems such as serious scarring of the washing device are solved. Also, due to the reduction of the water-carrying amount of the outlet gas, the vacuum degree of the fan is increased, and the output rate and stability of the fan are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following further describes in detail the specific embodiments of the present utility model with reference to the drawings:

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0015] In the figure: 1. Box body, 2. Wet and dry partition board, 3. Observation port, 4. Outlet pipe, 5. First spray pipe, 6. Liquid outlet, 7. Back-blowing port, 8. Intake pipe, 9. Second spray pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Referring to the attached drawings, the dust removal and washing device includes a box body 1. A dry-wet partition 2 is vertically arranged downward on the inner wall of the top of the box body 1, and the dry-wet partition 2 divides the inner cavity of the box body 1 into a first chamber and a second chamber; a first spray pipe 5 is provided at the top of the first chamber, and a nozzle is provided at the end, and the sprinkling area of the nozzle covers the internal space of the first chamber; an air inlet pipe 4 is provided in the middle, and the gas is sprayed onto the dry-wet partition 2 through the air inlet pipe 4, and the washing liquid is sprayed onto the dry-wet partition 2 through the first spray pipe 5, and both move downward along the dry-wet partition 2, and the washing vapor-liquid fully contacts on the dry-wet partition 2 to ensure full washing of the gas. At the same time, the dry-wet partition 2 changes the gas flow path, prolongs the gas residence time, makes most of the moisture in the gas stay in the box body, and reduces the water-carrying amount of the outlet gas. A liquid outlet 6 is provided at the lower part of the side wall of the first chamber, and the liquid outlet 6 is arranged at a position lower than the lower edge of the dry-wet partition 2, and the washing liquid flows out from the liquid outlet and is recycled. An air outlet pipe 4 is provided at the upper part of the side wall of the second chamber, and the gas is led out by a fan from the air outlet pipe after being washed. A back-blowing port 8 is provided below the liquid outlet, and high-temperature water is introduced when there is alkali scale at the bottom of the box body 1 to dissolve the alkali scale at the bottom. An observation port 3 is provided on the side of the second chamber, and the internal situation of the box body 1 is observed through the observation port 3 and regular cleaning is carried out. There is a second spray pipe 9 above the air inlet pipe 8. The second spray pipe 9 is fixed on a flange and is flange-connected to the air inlet pipe 8. It can be detachably cleaned during the operation of the device. A downward nozzle is provided at the end of the second spray pipe 9, and the washing liquid forms a fan surface through the nozzle to initially wash the dust-containing gas. The washing liquid flows into the box body 1 by gravity along the lower part of the air inlet pipe 8 to prevent scaling at the connection between the air inlet pipe and the box body.

[0017] The dust-containing gas in the alkali conveying system first enters the air inlet pipe 8, is washed and dust-removed and cooled through the second spray pipe 9 above the air inlet pipe 8, and the washing liquid flows into the box body 1 along the pipe wall to prevent scaling at the interface between the air inlet pipe 8 and the box body 1. Then the dust-containing gas enters the box body 1 and is sprayed onto the dry-wet partition 2. The flow direction of the dust-containing gas changes and it flows downward along the partition 2. The washing liquid sprayed by the first spray pipe 5 in the box body 1 also flows downward along the partition 2, so that the washing liquid and the dust-containing gas fully contact on the dry-wet partition 2, prolonging the gas-liquid contact time and performing more sufficient secondary washing on the dust-containing gas, and greatly reducing the dust content. After the washing liquid washes the dust-containing gas, it flows into the bottom of the box body 1 along the partition 2, flows out from the liquid outlet 6 at the bottom of the box body 1, and is recycled. After the concentration reaches the specified value, it is sent out. The fully washed dust-containing gas enters the second chamber through the gas channel at the bottom of the box body 1 and the dry-wet partition 2, and leaves the box body 1 through the air outlet pipe 4.

Claims

1. A dust removal and washing device for a soda ash conveying system, characterized in that: The invention comprises a box body (1) having an inner cavity, a dry-wet partition (2) being vertically arranged downward on the inner wall at the top of the box body (1), the dry-wet partition (2) being sealed and fixedly connected to the top and side walls of the box body (1), and a gas passage being arranged between the lower edge of the dry-wet partition (2) and the bottom plate of the box body (1); the dry-wet partition (2) dividing the inner cavity of the box body (1) into a first chamber and a second chamber; the first chamber and the second chamber are connected through the gas passage; an air inlet pipe (8) is arranged at the upper part of the side wall of the first chamber, and a liquid outlet (6) is arranged at the lower part, the liquid outlet (6) being arranged at a position lower than the lower edge of the dry-wet partition (2); a first spray pipe (5) is arranged at the top of the first chamber, a nozzle is arranged at the end of the spray pipe (5), and the water spraying area of ​​the nozzle covers the inner space of the first chamber; an air outlet pipe (4) is arranged at the upper part of the side wall of the second chamber.

2. The dust removal and washing device for the soda ash conveying system according to claim 1 is characterized in that: A second spray pipe (9) is provided at the upper inner portion of the air inlet pipe (8).

3. The dust removal and washing device for the soda ash conveying system according to claim 1 is characterized in that: The air inlet pipe (8) is connected to the side wall of the first chamber in an oblique manner downward from the outside.

4. The dust removal and washing device for the soda ash conveying system according to claim 1 is characterized in that: A backflush port (7) is provided on the inner wall of the lower portion of the side wall or the bottom of the first chamber.

5. The dust removal and washing device for the soda ash conveying system according to claim 1 is characterized in that: The side wall of the box body (1) is provided with an observation port (3).

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