CN216654072U

CN216654072U - Acid removal device in coal tar deep processing

Info

Publication number: CN216654072U
Application number: CN202220196033.8U
Authority: CN
Inventors: 刘增温; 王德州; 郝升学; 杨建杰; 孙益香; 于观刚; 高会成; 马丽娜; 侯俊杰; 杨滕交
Original assignee: Jfe Zhenxing Zaozhuang Chemical Co ltd
Current assignee: Jfe Zhenxing Zaozhuang Chemical Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-06-03
Anticipated expiration: 2032-01-25

Abstract

The utility model discloses an acid removal device in coal tar deep processing, which comprises a tower body, wherein the top of the tower body is provided with an air outlet, the two sides of the bottom of the tower body are respectively provided with an oil gas inlet and an alkali liquor inlet, and the middle of the bottom of the tower body is provided with a discharge hole; the middle part in the tower body is provided with a lye tank, the lye tank is formed by two hollow cylinders with the bottom sealed, wherein the cylinder positioned at the outer side is an outer cylinder, the cylinder positioned at the inner side is an inner cylinder, the outer cylinder and the inner cylinder are equal in height, the tops of the outer cylinder and the inner cylinder are respectively provided with a plurality of overflow teeth, and the tooth shapes of the inner overflow teeth and the outer overflow teeth are distributed in a staggered manner; the alkali liquor inlet is communicated with an alkali liquor pipeline, the alkali liquor pipeline penetrates through the side wall of the tower body, is inserted into the middle of the inner column body from the bottom of the hollow inner column body and is branched and connected to the side wall of the inner column body respectively, and an opening is formed in the side wall of the inner column body at the joint of one side or two sides; the upper part of the lye tank is provided with a plurality of layers of baffle plates, and the baffle plates at different layers extend downwards from two sides of the inner wall of the tower body to the middle part of the tower body. The acid removing device has a good acid removing effect, and saves maintenance time and cost.

Description

Acid removing device in deep processing of coal tar

Technical Field

The utility model belongs to the technical field of chemical equipment, and particularly relates to an acid removal device in deep processing of coal tar.

Background

At present, the deep processing process of coal tar comprises atmospheric distillation, reduced pressure distillation and industrial naphthalene distillation. The soft asphalt extracted from the bottom of the atmospheric distillation tower is heated to 370 ℃ by a decompression heating furnace and enters a decompression tower, negative pressure is formed in the tower under the action of a vacuum system to extract products, and top oil gas enters the vacuum system. The oil gas at the top of the vacuum tower enters a vacuum tank under the action of a vacuum pump, washing oil (absorbing oil for washing benzene or naphthalene compounds from coal gas and using the characteristic that the absorbing oil is similar to and soluble in coal tar and other components in petroleum for washing gas generated in the fractionation process so as to enable the gas to absorb substances such as benzene, naphthalene and the like in the gas) washes the oil gas in a spraying mode, then the washing oil enters a liquid seal tank, the washing oil and the washed oil gas are mixed by a washing oil circulating pump, enter a vacuum pump and are continuously circulated, and tail gas at the top of the liquid seal tank enters a tail gas system. However, the oil gas extracted from the top of the vacuum tower contains more highly corrosive acidic gas hydrogen sulfide, and the oil gas containing hydrogen sulfide can seriously corrode parts such as an impeller and a disc in the vacuum pump, a machine seal sealing cavity, an inner cavity, a machine seal, a baffle, a spacer bolt, a pump cover, a bearing seat, a bearing cover, a bearing and the like when circulating through the vacuum pump, so that the machine seal leakage is caused, the vacuum degree is reduced, the normal production is seriously influenced, the labor intensity of maintenance personnel is high, the maintenance cost is high, and equipment in the subsequent production process is also seriously influenced. Therefore, this problem is urgently needed to be solved.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: the acid removal device for the deep processing of the coal tar overcomes the defect that acid-containing oil gas corrodes subsequent process equipment in the prior art, has a good acid removal effect, saves maintenance time and cost, and ensures continuous and stable operation of production.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

an acid removal device in coal tar deep processing comprises a hollow cylindrical tower body, wherein the top of the tower body is provided with an air outlet, the two sides of the bottom are respectively provided with an oil gas inlet and an alkali liquor inlet, and the middle of the bottom is provided with a discharge hole; the middle part in the tower body is provided with a lye tank, the lye tank is formed by two hollow cylinders with sealed ends at the bottom, wherein, the cylinder positioned at the outer side is an outer cylinder, the cylinder positioned at the inner side is an inner cylinder, the circle center lines of the outer cylinder and the inner cylinder are overlapped, the outer cylinder and the inner cylinder have the same height, the tops of the outer cylinder and the inner cylinder are provided with a plurality of overflow teeth, and the tooth forms of the inner overflow teeth and the outer overflow teeth are distributed in a staggered way; the alkali liquor inlet is communicated with an alkali liquor pipeline, the alkali liquor pipeline penetrates through the side wall of the tower body, is inserted into the middle of the inner column body from the bottom of the hollow inner column body and is branched and connected to the side wall of the inner column body respectively, and an opening is formed in the side wall of the inner column body at the joint of one side or two sides; the alkali liquor is conveyed into the alkali liquor tank through an opening on the side wall of the inner column body. The alkali liquor pipeline also plays a role in supporting the alkali liquor tank; thus, the overflowed alkali liquor forms an inner annular waterfall and an outer annular waterfall, and acid in the oil gas to be treated is neutralized by the alkali liquor when the oil gas passes through the annular waterfalls. The upper part of the lye tank is provided with a plurality of layers of baffle plates, and the baffle plates at different layers extend downwards from two sides of the inner wall of the tower body to the middle part of the tower body and penetrate through the center line of the tower body to form intersection.

Preferably, the oil gas inlet be connected with the oil gas pipeline, the gas outlet of oil gas pipeline pastes the tower wall setting, or the oil gas pipeline stretches into lye tank bottom, corresponds the bottom of lye tank terminal and becomes cyclic annular setting, a plurality of gas outlets are seted up on the pipeline upper portion of cyclic annular setting.

Preferably, the distance between the outer side of the outer column body and the inner wall of the tower body is 4.5-5 cm, and the distance between the outer column body and the inner column body is 5.5-6.5 cm.

Furthermore, the distance between the outer side of the outer column body and the inner wall of the tower body is 5 cm, and the distance between the outer column body and the inner column body is 6.2 cm.

Because the outer column body is closer to the inner wall of the tower body, when the air outlet of the oil gas pipeline is arranged close to the wall of the tower body, oil gas enters and then is conveyed upwards through vacuum and must pass through the alkali liquor waterfall; when the gas outlet of the oil gas pipeline is arranged between two layers of alkali liquid waterfalls formed by the outer column body and the inner column body, the oil gas is conveyed upwards and must penetrate through the alkali liquid waterfalls, and thus, acid in the oil gas can be fully neutralized by the alkali liquid.

Preferably, the length of the crossing part between two layers of the baffle plate is one fifth to one fourth of the maximum length of the baffle plate.

Furthermore, the length of the cross part between two layers of the baffle plate is one fifth of the maximum length of the baffle plate.

Preferably, the baffle plate inclines downwards 15-18 degrees.

Further, the baffle plate is inclined downwards by 15 degrees.

Preferably, the distance between the baffle plates on the same side is 15-20 cm.

Furthermore, the distance between the baffle plates on the same side is 20 cm.

Due to the adoption of the technical scheme, the utility model has the beneficial effects that:

1. the tower body is internally provided with an alkali liquor tank which is a sawtooth-shaped overflow device, dilute alkali liquor firstly enters a cavity formed by the inner column body from the bottom, then branches enter the alkali liquor tank through the side wall of the inner column body, overflow is generated after the dilute alkali liquor is filled in the alkali liquor tank to form an inner alkali liquor waterfall and an outer alkali liquor waterfall, and acid substances (mainly hydrogen sulfide gas) in oil gas positively pass through the waterfall formed by the dilute alkali liquor when flowing upwards, so that the acid substances are neutralized, the concentration of acid gas is reduced, and the acid gas is prevented from flowing upwards to enter a vacuum pump and follow-up equipment to be corroded;

2. the utility model designs the baffle plate on the upper part of the lye tank, because the specific gravity of the gas is different from that of the liquid, when the liquid and the gas are mixed and flow together, if the liquid meets the blockage, the gas can be baffled and moved away, and the liquid continues to have a forward speed because of inertia, the forward liquid is attached to the wall surface of the blockage, and the liquid is converged to the bottom of the deacidification reaction tower due to the action of gravity and is discharged through a discharge hole; therefore, the oil-gas moisture can be separated through the baffle plate, so that the oil-gas moisture entering the vacuum pump is reduced.

In a word, the utility model has simple process design and good acid removal effect, saves maintenance time and cost and ensures continuous and stable operation of production.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a lye tank and a lye pipeline according to an embodiment of the present invention;

wherein, 1, a tower body; 2. an air outlet; 3. a discharge port; 4. a lye tank; 41. an outer cylinder; 42. an inner cylinder; 43. an overflow tooth; 5. an alkali liquor pipeline; 6. a baffle plate; 7. an oil and gas pipeline.

Detailed Description

The utility model is further illustrated below with reference to the figures and examples.

Example one

As shown in figures 1 and 2, the utility model relates to an acid removal device in coal tar deep processing, which comprises a hollow cylindrical tower body 1, wherein the top of the tower body 1 is provided with an air outlet 2, two sides of the bottom are respectively provided with an oil gas inlet (not marked) and an alkali liquor inlet (not marked), and the middle of the bottom is provided with a discharge hole 3; the middle part in the tower body 1 is provided with a lye tank 4, the lye tank 4 is formed by two hollow cylinders with sealed ends at the bottom, wherein, the cylinder positioned at the outer side is an outer cylinder 41, the cylinder positioned at the inner side is an inner cylinder 42, the circle center lines of the outer cylinder 41 and the inner cylinder 42 are overlapped, the outer cylinder 41 and the inner cylinder 42 have the same height, the tops are provided with a plurality of overflow teeth 43, and the tooth forms of the inner overflow teeth 43 and the outer overflow teeth 43 are distributed in a staggered way; the alkali liquor inlet is communicated with an alkali liquor pipeline 5, the alkali liquor pipeline 5 penetrates through the side wall of the tower body 1, is inserted into the middle of the inner column body 42 from the bottom of the hollow inner column body 42 and is branched and respectively connected to the side wall of the inner column body 42, and the side wall of the inner column body 42 at the joint of the two sides is provided with an opening; the upper part of the lye tank 4 is provided with a plurality of layers of baffle plates 6, and the baffle plates 6 at different layers mutually extend downwards from two sides of the inner wall of the tower body 1 to the middle part of the tower body 1 and penetrate through the central line of the tower body 1 to form intersection. The oil gas inlet is connected with an oil gas pipeline 7, the oil gas pipeline 7 extends into the bottom of the lye tank 4, the bottom of the end-sealed end of the lye tank 4 is arranged in an annular mode, and a plurality of gas outlets (not shown) are formed in the upper portion of the annular pipeline.

In actual production, oil gas extracted from the top of a decompression tower enters a vacuum tank firstly and is washed by washing oil to wash substances such as benzene, naphthalene and the like contained in the oil gas, then enters a tower body 1 of the deacidification device and is deacidified by alkali liquor, the reaction temperature in the tower body 1 is 45 ℃, the pressure is controlled to be-40 KPa, the oil gas flow is controlled to be 720m3/h, the 21 percent sodium hydroxide flow is controlled to be 1200kg/h, and the oil gas after deacidification enters a vacuum pump and is conveyed to a liquid seal tank for circulation. Through detection, the hydrogen sulfide content in the oil gas before and after the deacidification is respectively 153000 mu mol/mol and 30 mu mol/mol, so that the deacidification effect is very good, the replacement rate of the vacuum pump after the deacidification is changed from 3 original pumps in one year to zero replacement, and the maintenance time and the maintenance cost are greatly saved.

It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides a deacidification device in coal tar deep-processing which characterized in that: the device comprises a hollow cylindrical tower body, wherein a gas outlet is formed in the top of the tower body, an oil gas inlet and an alkali liquor inlet are formed in two sides of the bottom of the tower body respectively, and a discharge hole is formed in the middle of the bottom of the tower body; the middle part in the tower body is provided with a lye tank, the lye tank is formed by two hollow cylinders with sealed ends at the bottom, wherein the cylinder positioned at the outer side is an outer cylinder, the cylinder positioned at the inner side is an inner cylinder, the circle center lines of the outer cylinder and the inner cylinder are overlapped, the outer cylinder and the inner cylinder have the same height, the tops of the outer cylinder and the inner cylinder are provided with a plurality of overflow teeth, and the tooth forms of the inner overflow teeth and the outer overflow teeth are distributed in a staggered manner; the alkali liquor inlet is communicated with an alkali liquor pipeline, the alkali liquor pipeline penetrates through the side wall of the tower body, is inserted into the middle of the inner column body from the bottom of the hollow inner column body and is branched and connected to the side wall of the inner column body respectively, and an opening is formed in the side wall of the inner column body at the joint of one side or two sides; the upper part of the lye tank is provided with a plurality of layers of baffle plates, and the baffle plates at different layers extend downwards from two sides of the inner wall of the tower body to the middle part of the tower body and penetrate through the center line of the tower body to form intersection.

2. The acid removal device for further processing of coal tar according to claim 1, wherein: the oil gas inlet is connected with an oil gas pipeline, the gas outlet of the oil gas pipeline is arranged to be attached to the tower body wall, or the oil gas pipeline extends into the bottom of the lye tank.

3. The acid removal device in the deep processing of coal tar according to claim 2, characterized in that: the oil gas pipeline extends into the bottom of the lye tank and is arranged in an annular mode corresponding to the bottom of the sealing end, and a plurality of gas outlets are formed in the upper portion of the annularly arranged pipeline.

4. The acid removal device for further processing of coal tar according to claim 1, wherein: the distance between the outer side of the outer column body and the inner wall of the tower body is 4.5-5 cm, and the distance between the outer column body and the inner column body is 5.5-6.5 cm.

5. The acid removal device for further processing of coal tar according to claim 1, wherein: the distance between the outer side of the outer column body and the inner wall of the tower body is 5 centimeters, and the distance between the outer column body and the inner column body is 6.2 centimeters.

6. The acid removal device for further processing of coal tar according to claim 1, wherein: the length of the crossing part between two layers of the baffle plate is one fifth to one fourth of the maximum length of the baffle plate.

7. The acid removal device for further processing of coal tar according to claim 1, wherein: the baffle plates incline downwards 15-18 degrees, and the distance between baffle plates on the same side is 15-20 cm.