Tail gas treatment device in coal tar unloading and pretreatment process

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a tail gas treatment device in coal tar unloading and pretreatment processes, which comprises an air suction port of an air suction pipeline arranged at the tops of an unloading platform and a centrifugal machine, and the air suction pipeline is sequentially communicated with a gas-liquid separator, an alkaline tower, an induced draft fan and a tubular furnace through pipelines from the air suction port; a gas inlet is formed in the bottom of the gas-liquid separator, and a gas outlet is formed in the An alkali liquor spraying head is arranged in the alkali washing tower, and the bottom edge of the alkali liquor spraying head is attached to the side wall of the alkali washing tower; a tail gas suction inlet is formed in the center of the alkali liquor spraying head and is communicated to the induced draft fan from the top of the alkaline washing tower through a tail gas conveying pipe. The device can solve the problem of peculiar smell waste gas generated in the unloading process and the centrifugal deslagging process of the centrifugal machine, the environment quality is improved, and corrosion to the tubular furnace is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a tail gas treatment device in the unloading and pretreatment process of coal tar. Background Technology

[0002] Most of the coal tar raw materials used by coal tar deep processing enterprises are purchased externally. The raw coal tar is transported by truck, unloaded into an intermediate oil depot, and then fed into specialized containers to determine its moisture and ash content. Raw materials with low moisture and low ash content are directly sent to raw material tanks, while raw materials with high moisture and high ash content are transported to a 1000m³ storage tank. 3 A settling separation tank is used to remove moisture and ash in one step. If moisture and ash cannot be removed by settling separation, a centrifuge is used for separation, and qualified raw materials are transported to the raw material tank, while tar residue is discharged into the tar residue box. During unloading, centrifugation, and slag discharge, acidic and corrosive odorous gases, mainly composed of hydrogen sulfide, are generated. Currently, these gases are mainly emitted directly, causing environmental pollution, or drawn into a tubular furnace for combustion through suction ducts. However, because the gases are highly corrosive and cause significant damage to the tubular furnace, these gases need to be treated. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a tail gas treatment device in the process of coal tar unloading and pretreatment, which overcomes the defects of the prior art, can deal with the odorous waste gas generated during unloading and slag discharge after centrifugation, improve environmental quality, and reduce corrosion of tubular furnaces.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A tail gas treatment device for coal tar unloading and pretreatment process includes an air intake port of an air intake pipe installed on the unloading platform and the top of a centrifuge. The air intake pipe connects sequentially to a gas-liquid separator, an alkaline scrubbing tower, an induced draft fan, and a tubular furnace starting from the air intake port. The gas-liquid separator has an air inlet at the bottom and an air outlet at the top. The alkaline scrubbing tower is equipped with an alkaline spray head, the bottom edge of which is in contact with the side wall of the alkaline scrubbing tower. The center of the alkaline spray head has a tail gas intake port, which is connected to the induced draft fan from the top of the alkaline scrubbing tower through a tail gas delivery pipe.

[0006] Preferably, the gas-liquid separator cavity has several layers of filter cotton in its central part. The gas-liquid separator is model QYFL-15000, manufactured by Weifang Xinyu Environmental Engineering Co., Ltd.

[0007] Furthermore, the filter cotton layer is a fiber filter cotton layer, consisting of two layers: a G4-grade fiber filter cotton layer and an F7-grade fiber filter cotton layer. The different layers of fiber filter cotton have different performance characteristics, allowing for more effective interception of fine particulate matter such as water mist and dust in the exhaust gas.

[0008] Preferably, the alkaline spray head is connected to an external alkaline storage tank via an alkaline delivery pipe.

[0009] Preferably, the alkaline scrubbing tower has an air inlet at the bottom and an air outlet at the top; the bottom of the alkaline scrubbing tower also has an alkaline solution storage tank. Waste gas enters from the bottom of the tower, flows upwards, and reacts with the alkaline scrubbing liquid to remove acidic harmful substances. The alkaline scrubbing tower is model JXT-1.1, manufactured by Weifang Xinyu Environmental Engineering Co., Ltd.

[0010] Preferably, the induced draft fan is model YFJ-11000, and the manufacturer is Shandong Mingbin Environmental Protection Technology Co., Ltd.

[0011] Preferably, the tubular furnace is model YX14F-004-1, and the manufacturer is Jiangyin Yanxin Petrochemical Design Co., Ltd.

[0012] Preferably, as described above.

[0013] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0014] This invention uses a gas-liquid separator to separate and remove moisture, dust, and other fine particulate matter from the exhaust gas, reducing the amount of moisture and particulate matter entering the tubular furnace for combustion. The exhaust gas after gas-liquid separation is mainly composed of acidic and corrosive gases such as hydrogen sulfide. This acidic substance, including hydrogen sulfide, is neutralized by an alkaline scrubbing tower. As a result, the gas entering the tubular furnace will not corrode the furnace, and the gas after combustion in the tubular furnace meets emission standards, thus achieving the purpose of exhaust gas treatment.

[0015] In summary, this invention can address the problem of odorous exhaust gas generated during unloading and slag discharge after centrifugation, improve environmental quality, and reduce corrosion of tubular furnaces. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the equipment process according to an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the alkaline washing tower according to an embodiment of this utility model;

[0018] In the diagram, 1 is the unloading platform; 2 is the centrifuge; 3 is the air intake; 4 is the gas-liquid separator; 5 is the alkali washing tower; 51 is the alkali spray head; 52 is the tail gas intake; 53 is the tail gas delivery pipe; 54 is the alkali delivery pipe; 6 is the induced draft fan; and 7 is the tubular furnace. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 and Figure 2 As shown, a tail gas treatment device in the unloading and pretreatment process of coal tar includes an air intake 3 of an air intake pipe (not shown) installed on the top of the unloading platform 1 and the centrifuge 2. The air intake pipe connects to a gas-liquid separator 4, an alkaline washing tower 5, an induced draft fan 6 and a tubular furnace 7 in sequence from the air intake 3. The gas-liquid separator 4 has an air inlet (not shown) at the bottom and an air outlet (not shown) at the top. The alkaline washing tower 5 is equipped with an alkaline spray head 51, the bottom edge of which is attached to the side wall of the alkaline washing tower 5. The center of the alkaline spray head 51 is provided with a tail gas intake 52, which is connected to the induced draft fan 6 from the top of the alkaline washing tower 5 through a tail gas delivery pipe 53.

[0021] The alkali spray head 51 is connected to an external alkali storage tank (not shown) via an alkali delivery pipe 54.

[0022] In actual production, the exhaust gas generated by the unloading platform 1 and centrifuge 2 enters the suction pipe from the suction port 3 through the negative pressure generated by the induced draft fan 6, and then enters the gas-liquid separator 4. The gas-liquid separator 4 is equipped with fiber filter cotton layers with different properties. When the water mist, dust and other fine particles in the exhaust gas pass through these fiber filter cotton layers, they are intercepted, which can effectively remove the moisture and dust particles contained in the exhaust gas.

[0023] After being processed by the gas-liquid separator 4, the tail gas then enters the alkaline scrubbing tower 5. The alkaline scrubbing tower 5 is equipped with an alkaline spray head 51. The tail gas enters from one side of the bottom of the gas-liquid separator 4. The alkaline spray head 51 has a trumpet-shaped structure with a tail gas inlet 52 in the center. The alkaline delivery pipe 54 and the tail gas delivery pipe 53 are jacketed, with the alkaline delivery pipe 54 being the outer pipe and the tail gas delivery pipe 53 being the inner pipe. The inner pipe is connected to the tail gas inlet 52. Several alkaline spray holes (not marked) are evenly arranged between the outer edge of the tail gas inlet 52 and the outer edge of the alkaline spray head 51. The alkaline solution is evenly sprayed downward through the several alkaline spray holes to form an alkaline curtain. The tail gas entering from the side must pass through the alkaline curtain by the suction of the induced draft fan 6, thereby achieving acid-base neutralization and acid removal. The acid-removed tail gas is discharged from the top of the alkaline scrubbing tower 5 and enters the tubular furnace 7 for final incineration. The gas after incineration meets the emission standards and can be introduced into the chimney for emission.

[0024] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A tail gas treatment device for the coal tar unloading and pretreatment process, characterized in that: The system includes an air intake port on an air intake pipe located on the unloading platform and at the top of the centrifuge. The air intake pipe connects sequentially to a gas-liquid separator, an alkaline washing tower, an induced draft fan, and a tubular furnace. The gas-liquid separator has an air inlet at the bottom and an air outlet at the top. The alkaline washing tower is equipped with alkaline spray heads, the bottom edge of which is in contact with the side wall of the alkaline washing tower. The center of each alkaline spray head has a tail gas intake port, which is connected to the induced draft fan from the top of the alkaline washing tower via a tail gas delivery pipe.

2. The exhaust gas treatment device in the coal tar unloading and pretreatment process as described in claim 1, characterized in that: The gas-liquid separator cavity has several layers of filter cotton in the middle.

3. The exhaust gas treatment device in the coal tar unloading and pretreatment process as described in claim 2, characterized in that: The filter cotton layer is a fiber filter cotton layer, consisting of two layers: a G4 grade fiber filter cotton layer and an F7 grade fiber filter cotton layer.

4. The exhaust gas treatment device in the coal tar unloading and pretreatment process as described in claim 1, characterized in that: The alkaline spray head is connected to an external alkaline storage tank via an alkaline delivery pipe.

5. The exhaust gas treatment device in the coal tar unloading and pretreatment process as described in claim 1, characterized in that: The alkaline washing tower is equipped with an air inlet at the bottom and an air outlet at the top; the bottom of the alkaline washing tower is equipped with an alkali storage tank.

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