Naphthalene removal system for coke oven gas

Abstract

The utility model discloses a coke oven gas naphthalene removal system which comprises a gas fan which pressurizes coke oven gas and sequentially conveys the pressurized coke oven gas to a coarse naphthalene removal device, a first-stage compression cavity of a compressor, a fine naphthalene removal device and a second-stage compression cavity of the compressor for treatment. A first-stage gas-liquid separator and a second-stage gas-liquid separator are arranged at the inlet end of a first-stage compression cavity and the inlet end of a second-stage compression cavity of the compressor respectively, and liquid substances contained in gas can be further removed by arranging the first-stage gas-liquid separator and the second-stage gas-liquid separator at the inlet end of the first-stage compression cavity and the inlet end of the second-stage compression cavity of the compressor. Impact and vibration in the compressor are avoided, the compression efficiency of coke oven gas is improved, the service life of the compressor is greatly prolonged, liquid in the separator can be used for cooling a bearing cooling chamber of a gas fan, efficient utilization of separated liquid is achieved, and waste of the separated liquid is avoided.

Description

Technical Field

[0001] The utility model relates to the field of naphthalene removal from coke oven gas, in particular to a naphthalene removal system for coke oven gas. Background Art

[0002] The raw gas used in the benzene hydrogenation project is coke oven gas. The coke oven gas with a temperature of 0.006 MPa and a temperature of ≤40°C from outside the boundary is drawn by a gas blower 1 and transported to a crude naphthalene removal device 2 to remove most of the naphthalene and tar in the coke oven gas. The gas then enters the primary compression chamber 7 of a gas compressor 6 for compression.

[0003] After the gas is compressed to 0.45-0.5 MPa and 20-30°C by the first stage of the gas compressor, it enters the fine naphthalene removal device 10 to further remove the high boiling point impurities, and then returns to the second stage compression chamber 8 of the compressor to be compressed to 1.2-1.50 MPa to the deoiling pretreatment process (such as Figure 3 shown).

[0004] However, after the coke oven gas is washed by the denaphthalene device, it will contain some water. The coke oven gas with water will produce impact and vibration inside the compressor, which can easily cause damage to mechanical parts, such as pistons and connecting rods. After the water liquid enters the compressor, the liquid cannot be compressed, which will increase the energy consumption of the system, reduce energy utilization efficiency, increase the burden on the compressor, and shorten the life of the compressor. Utility Model Content

[0005] In order to solve the above-mentioned problems, the utility model provides a coke oven gas naphthalene removal system.

[0006] The utility model is realized through the following technical solutions:

[0007] A coke oven gas naphthalene removal system comprises a gas blower, which pressurizes the coke oven gas and sequentially delivers it to a coarse naphthalene remover, a primary compression chamber of a compressor, a fine naphthalene remover and a secondary compression chamber of the compressor for treatment. A primary gas-liquid separator and a secondary gas-liquid separator are respectively arranged at the inlet ends of the primary compression chamber and the secondary compression chamber of the compressor. Liquid inside the primary gas-liquid separator and the secondary gas-liquid separator is delivered to the gas blower for cooling through a circulating pressurization system.

[0008] Further optionally, the circulating pressurization system includes a storage box, which is respectively connected to the bottom of the primary gas-liquid separator and the secondary gas-liquid separator through a drain pipe, and a control valve is installed on the drain pipe. The storage box is pressurized by a delivery pump and transported along the cooling pipe to the gas blower bearing cooling room for cooling and circulated along the return pipe to the storage box.

[0009] Further optionally, partitions are installed inside the primary gas-liquid separator and the secondary gas-liquid separator, and multiple separation ports are arranged at the edges of the partitions.

[0010] Further optionally, a liquid level gauge is provided at the lower end of the first-stage gas-liquid separator and the second-stage gas-liquid separator, the liquid level gauge is electrically connected to the PLC controller, and the PLC controller is electrically connected to the control valve on the lower discharge pipe of the first-stage gas-liquid separator and the second-stage gas-liquid separator.

[0011] Further optionally, guide pipes are provided at the top outlet ends of the primary gas-liquid separator and the secondary gas-liquid separator.

[0012] Compared with the existing technology, the beneficial effects of the utility model are as follows: the utility model can further remove the liquid substances contained in the gas by arranging the first-stage gas-liquid separator and the second-stage gas-liquid separator at the inlet ends of the first-stage compression chamber and the second-stage compression chamber of the compressor, thereby avoiding the impact and vibration inside the compressor, improving the compression efficiency of the coke oven gas, and greatly extending the service life of the compressor. In addition, the liquid inside the separator can be used to cool the gas fan bearing cooling chamber, thereby realizing the efficient use of the separated liquid and avoiding the waste of the separated liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model system;

[0014] Figure 2 It is a schematic diagram of the structure of the partition in the gas-liquid separator;

[0015] Figure 3 It is a schematic diagram of the structure of the prior art of this utility;

[0016] In the figure: gas blower 1, crude naphthalene remover 2, primary gas-liquid separator 3, guide pipe 4, partition 5, separation port 51, compressor 6, primary compression chamber 7, secondary compression chamber 8, discharge pipe 9, fine naphthalene remover 10, secondary gas-liquid separator 11, storage box 12, delivery pump 13, cooling pipe 14, reflux pipe 15, control valve 16, PLC controller 17, liquid level meter 18. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0018] like Figure 1 As shown, a coke oven gas naphthalene removal system comprises a gas blower 1, which pressurizes the coke oven gas and sequentially delivers it to a coarse naphthalene remover 2, a primary compression chamber 7 of a compressor 6, a fine naphthalene remover 10 and a secondary compression chamber 8 of the compressor 6 for treatment. A primary gas-liquid separator 3 and a secondary gas-liquid separator 11 are respectively arranged at the inlet ends of the primary compression chamber 7 and the secondary compression chamber 8 of the compressor 6. Liquid inside the primary gas-liquid separator 3 and the secondary gas-liquid separator 11 are delivered to the gas blower 1 for cooling through a circulating pressurization system.

[0019] like Figure 1As shown, the circulating pressurization system includes a storage box 12, which is connected to the bottom of the primary gas-liquid separator 3 and the secondary gas-liquid separator 11 respectively through a drain pipe 9, and a control valve 16 is installed on the drain pipe 9. The storage box 12 is pressurized by a delivery pump 13 and transported along a cooling pipe 14 to the bearing cooling chamber of the gas blower 1 for cooling and circulated to the storage box 12 along a return pipe 15.

[0020] like Figure 2 As shown, a partition plate 5 is installed inside the primary gas-liquid separator 3 and the secondary gas-liquid separator 11 , and a plurality of separation ports 51 are arranged at the edge of the partition plate 5 .

[0021] like Figure 1 As shown, a liquid level gauge 18 is provided at the lower end of the first-stage gas-liquid separator 3 and the second-stage gas-liquid separator 11, and the liquid level gauge 18 is electrically connected to the PLC controller 17. The PLC controller 17 is electrically connected to the control valve 16 on the lower drainage pipe 9 of the first-stage gas-liquid separator 3 and the second-stage gas-liquid separator 11, and the automatic drainage function of the separator bottom is realized through the PLC controller 17 and the liquid level gauge 18.

[0022] like Figure 1 As shown, a guide pipe 4 is provided at the top outlet end of the primary gas-liquid separator 3 and the secondary gas-liquid separator 11 .

[0023] like Figure 1 As shown, the liquid level meter 18 is arranged at the lower part of the partition 5, so that the liquid level in the separator is always at the lower part of the partition 5, ensuring the function of the partition 5 to isolate water vapor.

[0024] The implementation principle of a coke oven gas naphthalene removal system in the present application embodiment is:

[0025] The gas blower 1 conveys the coke oven gas to the coarse naphthalene removal device 2 to remove most of the tar and naphthalene, and then enters the primary gas-liquid separator 3, through which the moisture in the coke oven gas is removed, and enters the primary compression chamber 7 of the compressor 6, and after being compressed in the primary compression chamber 7, enters the fine naphthalene removal device 10 to remove the residual tar and naphthalene in the coke oven gas, and the coke oven gas after removal enters the secondary gas-liquid separator 11 to remove the moisture contained therein, and the coke oven gas with moisture removed enters the secondary compression chamber 8 of the compressor 6 and is pressurized and conveyed to the deoiling pretreatment section for treatment;

[0026] The primary gas-liquid separator 3 and the secondary gas-liquid separator 11 are arranged at the inlet ends of the primary compression chamber 7 and the secondary compression chamber 8 of the compressor 6 to further remove the liquid substances contained in the gas, avoid the impact and vibration inside the compressor, improve the compression efficiency of the coke oven gas, and greatly extend the service life of the compressor;

[0027] The coke oven gas containing moisture enters the separator from the middle and upper part of the separator, and is buffered in the separator to achieve gas-liquid separation. The liquid substance flows in along the tank wall and enters the lower part of the separator for storage from the separation port 51 of the partition 5. The gas comes out along the top guide pipe 4 and enters the compressor for compression. The guide pipe 4 extends the gas flowability and effectively avoids the phenomenon of gas carrying liquid, and avoids the gas being directly discharged from the top of the separator. The middle partition 5 can prevent the moisture of the liquid gathered in the lower part, and avoid the possibility of secondary liquid carrying after the gas enters.

[0028] As the liquid level in the separator rises and reaches the preset level of the liquid level meter 18, the liquid level meter 18 transmits a signal to the PLC controller 17. The PLC controller 17 controls the opening of the control valve 16 on the drain pipe 9 and delays for 30 seconds. The liquid at the bottom of the separator is discharged to the storage box 12 for collection. At the same time, the liquid in the storage box 12 is transported to the bearing cooling room of the gas fan 1 through the delivery pump 13 for cooling, thereby realizing efficient utilization of the separated liquid and avoiding waste of the separated liquid.

[0029] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A coke oven gas naphthalene removal system, comprising a gas blower (1), the gas blower (1) pressurizes the coke oven gas and sequentially transports it to a coarse naphthalene removal device (2), a primary compression chamber (7) of a compressor (6), a fine naphthalene removal device (10) and a secondary compression chamber (8) of the compressor (6) for treatment, characterized in that: A primary gas-liquid separator (3) and a secondary gas-liquid separator (11) are respectively provided at the inlet ends of the primary compression chamber (7) and the secondary compression chamber (8) of the compressor (6); liquid inside the primary gas-liquid separator (3) and the secondary gas-liquid separator (11) is transported to the gas blower (1) for cooling through a circulating pressurizing system.

2. A coke oven gas naphthalene removal system according to claim 1, characterized in that: The circulating pressurizing system comprises a storage box (12), wherein the storage box (12) is respectively connected to the bottom of the primary gas-liquid separator (3) and the secondary gas-liquid separator (11) through a drain pipe (9), and a control valve (16) is installed on the drain pipe (9). The storage box (12) is pressurized by a delivery pump (13) and delivered along a cooling pipe (14) to a bearing cooling chamber of a gas blower (1) for cooling and circulated to the storage box (12) along a return pipe (15).

3. A coke oven gas naphthalene removal system according to claim 2, characterized in that: A partition plate (5) is installed inside the primary gas-liquid separator (3) and the secondary gas-liquid separator (11), and a plurality of separation ports (51) are arranged on the edge of the partition plate (5).

4. A coke oven gas naphthalene removal system according to claim 3, characterized in that: A liquid level meter (18) is provided at the lower end of the first gas-liquid separator (3) and the second gas-liquid separator (11); the liquid level meter (18) is electrically connected to a PLC controller (17); and the PLC controller (17) is electrically connected to a control valve (16) on a lower liquid discharge pipe (9) of the first gas-liquid separator (3) and the second gas-liquid separator (11).

5. A coke oven gas naphthalene removal system according to claim 4, characterized in that: A guide pipe (4) is provided at the top outlet end of the primary gas-liquid separator (3) and the secondary gas-liquid separator (11).

6. A coke oven gas naphthalene removal system according to claim 4, characterized in that: The liquid level meter (18) is arranged at the lower part of the partition (5).

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