VOC tail gas efficient treatment device of coal-based rectification system

Abstract

The coal-based rectification system VOC tail gas efficient treatment device comprises a tank body, a spacer bush is arranged on the inner axis of the tank body, the upper end of the spacer bush is fixedly connected with the top wall of the tank body, the lower end of the spacer bush is open, a spiral piece is arranged between the spacer bush and the inner wall of the tank body, and a spiral channel is defined by the spiral piece, the tank body and the spacer bush; a liquid supply pipe is arranged in the spacer bush in the axis direction, the lower portion of the liquid supply pipe is connected with a water pump, the water pump is fixedly connected with the bottom of the tank body, the pipe wall of the liquid supply pipe is communicated with a plurality of branch pipes, the branch pipes penetrate through the spacer bush, stretch into the spiral channel and are spirally distributed in the spiral channel, and spray heads are evenly distributed on the pipe sections, located in the spiral channel, of the branch pipes. According to the VOC tail gas treatment device, VOC tail gas is firstly cooled, the airflow passing time is prolonged, the cooling effect is good, the contact time of VOC gas and washing liquid is prolonged, full washing adsorption is conducted, then gas-liquid separation is conducted, the VOC gas can be rapidly and efficiently treated, and the using effect is remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, and in particular to a high-efficiency treatment device for VOC tail gas of a coal-based distillation system. Background Art

[0002] VOC waste gas is a kind of volatile organic compound waste gas. The control technologies for VOC waste gas treatment include combustion, photocatalysis, activated carbon adsorption, absorption, condensation, biological treatment, etc. Among them, the absorption method uses adsorption solution spraying combined with VOC waste gas to remove harmful components, reduce VOC gas concentration, and achieve waste gas emission standards; The patent with authorization announcement number CN218459084U discloses a spray washing tower for treating VOC waste gas, including a base, a spray washing tower body is installed on the top of the base, and a partition is installed at the bottom end of the inside of the spray washing tower body, and a slow flow seat is installed on the top of the partition. By providing the partition, the inside of the spray washing tower body can be divided into two spray washing areas by the partition during use, and the VOC waste gas can be diverted by cooperating with the two groups of VOC waste gas inlet pipes. At the same time, by providing a first spray pipe, a second spray pipe and a third spray pipe, the spray range of the VOC waste gas is improved, but the VOC waste gas is introduced into the spray washing area through the inlet pipe, and the contact time between the VOC waste gas and the spray washing liquid is short, and then the VOC waste gas flows upward, and the discharged gas is mixed with water mist, and there is no gas-liquid separation function. The use effect is general and needs to be improved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a high-efficiency treatment device for VOC tail gas from a coal-based distillation system. The device has a significant use effect, cools the VOC tail gas, increases the airflow time, has a good cooling effect, increases the contact time between the VOC gas and the washing liquid, and performs sufficient washing and adsorption, followed by gas-liquid separation, so that the VOC gas can be treated quickly and efficiently, and the problems in the background technology can be effectively solved.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a highly efficient VOC tail gas treatment device for a coal-based distillation system, comprising a tank body, a spacer is provided on the internal axis of the tank body, the upper end of the spacer is fixedly connected to the top wall of the tank body, the lower end of the spacer is open, a spiral sheet is provided between the spacer and the inner wall of the tank body, and the spiral sheet, the tank body and the spacer form a spiral channel; a liquid supply pipe is provided in the direction of the internal axis of the spacer, the lower part of the liquid supply pipe is connected to a water pump, the water pump is fixedly connected to the bottom of the tank body, and the wall of the liquid supply pipe is connected to a plurality of branch pipes, A plurality of branch pipes penetrate the spacer sleeve and extend into the spiral channel and are distributed in a spiral shape in the spiral channel, and nozzles are evenly distributed on the pipe sections of the branch pipes located in the spiral channel; an air inlet corresponding to the spiral channel is provided on the upper part of the tank body, and an exhaust port corresponding to the spacer sleeve is also provided on the upper part of the outer wall of the tank body; a conical shell is provided at the lower end opening of the spacer sleeve, the lower end of the conical shell is larger and the upper end is smaller, the upper end opening diameter of the conical shell is larger than the diameter of the liquid supply pipe, a conical spiral sheet is provided inside the conical shell, and the inner side of the conical spiral sheet is in contact with the outer wall of the liquid supply pipe.

[0005] Preferably, the spiral channel is divided into three channel areas, upper, middle and lower, the upper area is the cooling area, the middle area is the spraying area, and the lower area is the transition area; a cooling coil is also provided on the upper part of the tank body, and the cooling coil is arranged spirally in the cooling area; a plurality of branch pipes are arranged spirally in the spraying area.

[0006] Preferably, the nozzle faces the flow direction of the VOC tail gas in the spraying area.

[0007] Preferably, a water drop tray is provided at the lower end of the spacer, the water drop tray is arranged to be inclined downward, and an annular gap is formed between the edge of the water drop tray and the inner wall of the tank body.

[0008] Preferably, the lower surface of the water drop tray is provided with a plurality of coaxially arranged annular baffles, and the lower ends of the plurality of annular baffles are gradually lengthened.

[0009] Preferably, a retaining ring is provided at the upper end of the conical shell, and the upper part of the retaining ring is filled with an activated carbon layer.

[0010] Preferably, a liquid inlet pipe is provided at the lower portion of the outer wall of the tank body, a liquid discharge pipe is provided at the bottom of the tank body, and valves are installed on both the liquid inlet pipe and the liquid discharge pipe.

[0011] Preferably, the washing liquid is stored in the lower inner portion of the tank body, and a sight glass is provided on the outer wall of the tank body.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging spiral blades between the spacer and the inner wall of the tank body, the VOC gas flows through the spiral channel and is first cooled by the cooling coil, thereby increasing the air flow passing time and achieving a good cooling effect; in the spiral channel, the VOC gas is fully in contact with the washing liquid sprayed by the branch pipe nozzle, thereby increasing the contact time between the VOC gas and the washing liquid, and is fully washed and adsorbed in this area, and then continues to flow in the transition zone, where the gas and liquid are initially separated, and then passes through the conical shell and the conical spiral blades for separation, thereby achieving gas-liquid separation, and then is filtered again by the activated carbon layer and discharged through the exhaust port, thereby being able to quickly and efficiently treat the VOC gas, and having a significant use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is an enlarged schematic diagram of the local structure of the present invention.

[0014] In the figure: 1 air inlet, 2 spiral blades, 3 spacers, 4 nozzles, 5 tank body, 6 liquid inlet pipe, 7 liquid discharge pipe, 8 water pump, 9 water drop tray, 10 conical spiral blades, 11 conical shell, 12 activated carbon layer, 13 branch pipes, 14 liquid supply pipes, 15 spiral channels, 16 cooling coils, 17 exhaust ports, 18 retaining rings, and 19 annular baffles. DETAILED DESCRIPTION

[0015] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0016] See also Figure 1-2The present invention provides a technical solution: a highly efficient treatment device for VOC tail gas in a coal-based distillation system, comprising a tank body 5, a spacer 3 is arranged on the inner axis of the tank body 5, the upper end of the spacer 3 is fixedly connected to the top wall of the tank body 5, the lower end of the spacer 3 is open, a spiral sheet 2 is arranged between the spacer 3 and the inner wall of the tank body 5, the spiral sheet 2 and the tank body 5 and the spacer 3 form a spiral channel 15; a liquid supply pipe 14 is arranged in the inner axis direction of the spacer 3, the lower part of the liquid supply pipe 14 is connected to a water pump 8, the water pump 8 is fixedly connected to the bottom of the tank body 5, the pipe wall of the liquid supply pipe 14 is connected to a plurality of branch pipes 13, and the plurality of branch pipes 13 penetrate the spacer 3. The sleeve 3 extends into the spiral channel 15 and is spirally distributed in the spiral channel 15. The branch pipe 13 is evenly distributed with nozzles 4 in the pipe section located in the spiral channel 15; the upper part of the tank body 5 is provided with an air inlet 1 corresponding to the spiral channel 15, and the upper part of the outer wall of the tank body 5 is also provided with an exhaust port 17 corresponding to the spacer sleeve 3; the lower end opening of the spacer sleeve 3 is provided with a conical shell 11, the lower end of the conical shell 11 is large and the upper end is small, the upper end opening diameter of the conical shell 11 is larger than the diameter of the liquid supply pipe 14, and the conical spiral piece 10 is provided inside the conical shell 11, and the inner side of the conical spiral piece 10 is in contact with the outer wall of the liquid supply pipe 14; It can be understood that the VOC gas is blown into the tank body 5 through the air inlet 1 by an external blower, the VOC gas flows through the spiral channel 15, the water pump 8 extracts the washing liquid at the bottom of the tank body 5, and then pumps it to the multiple branch pipes 13 through the liquid supply pipe 14. Since the multiple branch pipes 13 are spirally arranged in the spiral channel 15, the VOC gas in the spiral channel 15 is fully in contact with the washing liquid sprayed by the nozzle of the branch pipe 13, thereby increasing the contact time between the VOC gas and the washing liquid, and effectively neutralizing and removing harmful components in the VOC gas. The washed VOC gas enters the spacer 12, and the airflow flows into the conical shell 11. Under the guidance of the conical spiral blade 10, gas-liquid separation is achieved, and then the gas enters the spacer 3 through the gap between the upper end opening of the conical shell 11 and the liquid supply pipe 14, and then is discharged through the exhaust port 17, with a significant use effect. Specifically, the spiral channel 15 is divided into three channel areas, namely, the upper area is the cooling area, the middle area is the spraying area, and the lower area is the transition area. A cooling coil 16 is also provided on the upper part of the tank body 5, and the cooling coil 16 is arranged in a spiral shape in the cooling area. A plurality of branch pipes 13 are arranged in a spiral shape in the spraying area. When the VOC gas flows through the spiral channel 15, the cooling coil 16 first cools the VOC gas. In the cooling area, the cooling coil 16 is arranged in a spiral shape, which increases the contact time between the airflow and the cooling coil 16, and the cooling effect is good. In the spraying area, the washing liquid sprayed by the nozzle 4 fully contacts the VOC gas, which increases the contact time between the VOC gas and the washing liquid, and the washing is sufficient. Then, the gas continues to flow in the transition area, where the gas and liquid are initially separated. Furthermore, the nozzle 4 faces the flow direction of the VOC tail gas in the spraying area, that is, the nozzle 4 faces the cross-sectional direction of the VOC tail gas flowing in the spraying area, thereby increasing the contact area between the nozzle 4 and the VOC tail gas; Furthermore, a water drop tray 9 is provided at the lower end of the spacer 3. The water drop tray 9 is tilted downward, and there is an annular gap between the edge of the water drop tray 9 and the inner wall of the tank body 5. The water drop tray 9 has a flow-guiding effect, and the liquid falls through the water drop tray 9, while guiding the air flow to flow through the gap between the water drop tray 9 and the tank body 5. Furthermore, the lower surface of the water tray 9 is provided with a plurality of coaxially arranged annular baffles 19, the lower ends of which are gradually lengthened to play a guiding role, and the gas and liquid collide with the annular baffles 19 to play a certain gas-liquid separation role; Furthermore, a retaining ring 18 is provided at the upper end of the conical housing 11, and an activated carbon layer 20 is filled on the upper part of the retaining ring 18 for adsorbing and filtering the treated gas again; Furthermore, a liquid inlet pipe 6 is provided at the lower part of the outer wall of the tank body 5, and a liquid discharge pipe 7 is provided at the bottom of the tank body 5. Both the liquid inlet pipe 6 and the liquid discharge pipe 7 are equipped with valves. The liquid inlet pipe 6 is used to add washing liquid to the tank body 5, and the liquid discharge pipe 7 is used to discharge the washing liquid, which is convenient for subsequent maintenance; Furthermore, the lower part of the tank body 5 stores washing liquid, and the outer wall of the tank body 5 is provided with a sight glass for observing the liquid level of the washing liquid.

[0017] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the content of the present invention.

Claims

1. A highly efficient VOC tail gas treatment device for a coal-based distillation system, comprising a tank body (5), characterized in that: A spacer (3) is provided on the inner axis of the tank body (5), the upper end of the spacer (3) is fixedly connected to the top wall of the tank body (5), the lower end of the spacer (3) is open, a spiral sheet (2) is provided between the spacer (3) and the inner wall of the tank body (5), the spiral sheet (2) and the tank body (5) and the spacer (3) form a spiral channel (15); a liquid supply pipe (14) is provided in the inner axis direction of the spacer (3), the lower part of the liquid supply pipe (14) is connected to the water pump (8), the water pump (8) is fixedly connected to the bottom of the tank body (5), the pipe wall of the liquid supply pipe (14) is connected to a plurality of branch pipes (13), the plurality of branch pipes (13) penetrate the spacer (3) and extend into the spiral channel (15), and are connected to the spiral channel (15) at the spiral channel. The spiral channel (15) is distributed in a spiral shape, and the branch pipe (13) is evenly distributed with nozzles (4) in the pipe section located in the spiral channel (15); the upper part of the tank body (5) is provided with an air inlet (1) corresponding to the spiral channel (15), and the upper part of the outer wall of the tank body (5) is also provided with an exhaust port (17) corresponding to the spacer (3); the lower end opening of the spacer (3) is provided with a conical shell (11), the lower end of the conical shell (11) is larger than the upper end, and the upper end opening diameter of the conical shell (11) is larger than the diameter of the liquid supply pipe (14), and a conical spiral piece (10) is provided inside the conical shell (11), and the inner side of the conical spiral piece (10) is in contact with the outer wall of the liquid supply pipe (14).

2. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 1, characterized in that: The spiral channel (15) is divided into three channel areas, namely, upper, middle and lower channel areas. The upper area is a cooling area, the middle area is a spraying area, and the lower area is a transition area. A cooling coil (16) is also provided on the upper part of the tank body (5). The cooling coil (16) is arranged in a spiral shape in the cooling area. The plurality of branch pipes (13) are arranged in a spiral shape in the spraying area.

3. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 2 is characterized by: The spray head (4) faces the flow direction of the VOC tail gas in the spraying area.

4. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 1 is characterized in that: A water drop tray (9) is provided at the lower end of the spacer (3). The water drop tray (9) is arranged to be tilted downward, and an annular gap is formed between the edge of the water drop tray (9) and the inner wall of the tank body (5).

5. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 4 is characterized by: The lower surface of the water drop tray (9) is provided with a plurality of coaxially arranged annular baffles (19), and the lower ends of the plurality of annular baffles (19) are gradually lengthened.

6. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 1, characterized in that: A retaining ring (18) is provided at the upper end of the conical shell (11), and an activated carbon layer (20) is filled on the upper part of the retaining ring (18).

7. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 1 is characterized by: A liquid inlet pipe (6) is provided at the lower part of the outer wall of the tank body (5), and a liquid discharge pipe (7) is provided at the bottom of the tank body (5). Both the liquid inlet pipe (6) and the liquid discharge pipe (7) are equipped with valves.

8. The device for efficiently treating VOC tail gas from a coal-based distillation system according to claim 1 is characterized by: The lower part of the tank body (5) stores washing liquid, and the outer wall of the tank body (5) is provided with a liquid sight glass.

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