CN216909759U

CN216909759U - VOCs exhaust-gas treatment system

Info

Publication number: CN216909759U
Application number: CN202123439888.3U
Authority: CN
Inventors: 陈功骞; 郭衍; 谢智煌; 李雅君; 林翔
Original assignee: Fujian Longking Co Ltd.
Current assignee: Fujian Longking Co Ltd.
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-07-08
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a VOCs waste gas treatment system which comprises a rotating wheel part, wherein the rotating wheel part comprises two rotating wheels which are coaxially arranged and have the same diameter, and the space where the rotating wheel part is located is divided into a fan-shaped desorption area and a fan-shaped adsorption area by taking the rotating center of the rotating wheels as the circle center; the adsorption zone is used for VOCs waste gas to pass through, and the desorption zone is used for desorption gas to pass through; the rotating directions of the two rotating wheels are opposite, and along the flowing direction of the VOCs waste gas, the rotating speed of the rotating wheel positioned at the upstream is greater than that of the rotating wheel positioned at the downstream; the flow direction of the VOCs off-gas is opposite to the flow direction of the desorption gas. The VOCs adsorption rate of swiveling wheel can be improved to the structural setting of this system, improves purification efficiency.

Description

VOCs exhaust-gas treatment system

Technical Field

The utility model relates to the technical field of waste gas treatment, in particular to a VOCs waste gas treatment system.

Background

In the petrochemical industry, the automobile manufacturing industry and other industries, the waste gas of VOCs (volatile organic compounds) is generated, and the common components of the VOCs comprise hydrocarbons, benzene series, alcohols, ketones, phenols, aldehydes, ammonia and the like.

Currently, a treatment method for VOCs waste gas is to use a molecular sieve wheel, please refer to fig. 1 and 2, in which fig. 1 is a schematic view of a prior molecular sieve wheel in terms of spatial division, and fig. 2 is a schematic view of a prior system for treating VOCs waste gas.

The main body of the molecular sieve rotating wheel is a rotating wheel 1 ' filled with an adsorbent, the space where the rotating wheel 1 ' is located is divided into twelve areas along the circumferential direction, one area is a desorption area 11 ', one area is a regeneration area 12 ', the rest ten areas are adsorption areas 13 ', and the regeneration area 12 ' is located at the downstream of the desorption area 11 ' along the rotating direction of the rotating wheel 1 ', namely, when the rotating wheel 1 ' rotates, the rotating wheel firstly passes through the desorption area 11 ' and then passes through the regeneration area 12 '.

In the orientation shown in fig. 2, during operation, the waste gas 2 ' of VOCs passes through the adsorption region 13 ' of the rotating wheel 1 ' from left to right, the rotating wheel 1 ' adsorbs and removes the organic VOCs in the waste gas of VOCs in the adsorption region 13 ', the purified gas is discharged, when the rotating wheel 1 ' rotates to the desorption region 11 ', the waste gas is desorbed by being treated by hot air heated by the heater 4 ', then the waste gas rotates to the regeneration region 12 ' and is cooled and regenerated by cold air 3 ' passing through the regeneration region 12 ', and then the waste gas rotates to the adsorption region 11 ' to continue adsorption, so that the rotating wheel 1 ' continuously rotates in each region to realize adsorption-desorption-regeneration, thereby realizing the treatment of the waste gas of VOCs.

As shown in fig. 2, the flow direction of the hot air passing through the desorption region 11 'is from right to left, and in practical applications, it is found that the heat of the desorbed hot air is accumulated at the left end of the rotating wheel 1', so that the desorption efficiency at the right end of the rotating wheel 1 'is relatively low, and the adsorption rate of VOCs affecting the rotating wheel 1' cannot be further increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a VOCs waste gas treatment system, which is structurally arranged to improve the VOCs adsorption rate of a rotating wheel and improve the purification efficiency.

In order to solve the technical problem, the utility model provides a VOCs waste gas treatment system, which comprises a rotating wheel part, wherein the rotating wheel part comprises two rotating wheels which are coaxially arranged and have the same diameter, and the space where the rotating wheel part is located is divided into a fan-shaped desorption area and a fan-shaped adsorption area by taking the rotating center of the rotating wheels as the circle center; the adsorption zone is used for VOCs waste gas to pass through, and the desorption zone is used for desorption gas to pass through; the rotating directions of the two rotating wheels are opposite, and the rotating speed of the upstream rotating wheel is greater than that of the downstream rotating wheel along the flow direction of the VOCs waste gas; the flow direction of the VOCs waste gas is opposite to the flow direction of the desorption gas.

According to the VOCs waste gas treatment system, two rotating wheels are arranged on a rotating wheel part, the two rotating wheels are coaxially arranged and have the same diameter, the rotating directions of the two rotating wheels are opposite, the rotating speed of the rotating wheel positioned at the upstream is larger than that of the rotating wheel positioned at the downstream along the flowing direction of VOCs waste gas, and the space where the rotating wheel part is located is not provided with a cooling area in the circumferential direction and only needs to be divided into a desorption area and an adsorption area; for convenience of description, the rotating wheel with the higher rotating speed is referred to as a first rotating wheel, and the rotating wheel with the lower rotating speed is referred to as a second rotating wheel, so that the second rotating wheel can adsorb more VOCs during adsorption; during desorption, the thermal desorption time is relatively longer because the rotating speed of the second rotating wheel is slower, so that more heat is transferred to the first rotating wheel, and the desorption of the first rotating wheel is facilitated; the rotation directions of the two rotating wheels are opposite, so that the second rotating wheel passing through the adsorption process is at normal temperature, the adsorption quantity is improved by combining with a slower rotating speed, and special cooling is not needed; meanwhile, the cooling area is eliminated, the original cooling area can be used as the adsorption area, the area of the adsorption area is increased, and the adsorption capacity is improved.

In the VOCs waste gas treatment system, the thicknesses of the two rotating wheels are the same.

In the above-mentioned VOCs waste gas treatment system, the space between the two rotating wheels is closed by a sealing ring, and a partition plate is arranged in the sealing ring and used for separating the area of the space corresponding to the adsorption area from the area corresponding to the desorption area.

In the system for treating VOCs waste gas as described above, the central angle of the desorption zone is 30 degrees, and the central angle of the adsorption zone is 330 degrees.

The VOCs waste gas treatment system further comprises two driving components which are respectively used for driving the two rotating wheels to rotate.

According to the VOCs waste gas treatment system, the driving part comprises the motor and the transmission part, the transmission part comprises the driving wheel and the transmission belt, the driving wheel is fixedly connected with the output shaft of the motor, and the transmission belt is in transmission connection with the driving wheel and the rotating wheel.

As described above, the exhaust gas treatment system for VOCs is provided with the filter upstream of the rotating wheel portion in the flow direction of the VOCs exhaust gas.

According to the VOCs waste gas treatment system, the first fan is arranged at the downstream of the rotating wheel part along the flow direction of the VOCs waste gas.

The VOCs waste gas treatment system further comprises a heater, wherein the heater is used for heating the desorption gas, and the desorption gas firstly passes through the heater and then passes through the desorption area.

The VOCs waste gas treatment system further comprises a second fan, wherein the second fan and the heater are positioned on different sides of the rotating wheel part and correspond to the desorption position.

Drawings

FIG. 1 is a schematic view of a molecular sieve wheel in a space division manner;

FIG. 2 is a schematic diagram of a prior art VOCs exhaust treatment system;

FIG. 3 is a simplified diagram of a VOCs effluent treatment system in accordance with the present invention;

fig. 4 is a schematic view of a rotor section of fig. 3 divided into sections.

In fig. 1 and 2:

the rotary wheel 1 ', the desorption area 11 ', the regeneration area 12 ', the adsorption area 13 ', the VOCs waste gas 2 ', the cold air 3 ' and the heater 4 ';

in fig. 3 and 4:

the device comprises a rotating wheel part 10, a rotating wheel 11, a sealing ring 12, a desorption area 101, an adsorption area 102, a filter 20, a first fan 30, a heater 40, a second fan 50, a motor 60 and a transmission belt 70;

VOCs exhaust Q1, desorption gas Q2.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 3 and 4, fig. 3 is a schematic diagram of a VOCs exhaust treatment system according to the present invention; fig. 4 is a schematic view of a rotor section of fig. 3 divided into sections.

In this embodiment, the VOCs exhaust treatment system comprises a rotating wheel section 10, the rotating wheel section 10 comprising two coaxially arranged rotating wheels 11 of the same diameter.

The space in which the rotating wheel part 10 is located is divided into a sector-shaped desorption zone 101 and a sector-shaped adsorption zone 102 by taking the rotation center of the rotating wheel 11 as a center, as shown in fig. 4, wherein the adsorption zone 102 is used for the VOCs waste gas Q1 to pass through, and the desorption zone 101 is used for the desorption gas Q2 to pass through.

The two rotating wheels 11 of the rotating wheel section 10 are arranged in opposite rotation directions, and the hollow arrows marked on the two rotating wheels 11 in fig. 3 indicate the respective rotation directions, and along the flow direction of the VOCs off-gas, the rotating wheel 11 located upstream has a higher rotation speed than the rotating wheel 11 located downstream, and the flow direction of the VOCs off-gas Q1 is opposite to the flow direction of the desorption gas Q2.

In the orientation shown in fig. 3, the flow direction of the VOCs off-gas Q1 is shown from left to right, and the flow direction of the desorption gas Q2 is shown from right to left.

As described above, in this VOCs off-gas treatment system, the rotation wheel section 10 is provided with two rotation wheels 11, the two rotation wheels 11 are coaxially arranged and have the same diameter, the rotation directions of the two rotation wheels 11 are opposite, the rotation speed of the rotation wheel 11 located upstream is higher than that of the rotation wheel 11 located downstream in the flow direction of the VOCs off-gas Q1, and the space in which the rotation wheel section 10 is located is not provided with a cooling zone in the circumferential direction but is divided into the desorption zone 101 and the adsorption zone 102; in this way, during adsorption, the rotation speed of the rotor 11 on the right side of the figure is slow, the concentration factor of the rotor 11 on the right side is increased, and the amount of the adsorbed VOCs is larger; during desorption, the rotating speed of the rotating wheel 11 on the right side is slower, so that the thermal desorption time is relatively longer, and more heat is transferred to the rotating wheel 11 on the left side, which is beneficial to the desorption of the rotating wheel 11 on the left side; the rotation directions of the two rotating wheels 11 are opposite, so that the rotating wheel 11 on the right side through which the adsorption passes is always at the normal temperature, the adsorption capacity is improved by combining the slow rotating speed, and special cooling is not needed; meanwhile, the original cooling area can be used as the adsorption area 102 due to the elimination of the cooling area, so that the area of the adsorption area 102 is increased, the adsorption capacity is improved, and the treatment process is simplified due to the elimination of the cooling area. According to experimental research, the removal rate of VOCs organic matters of which the tail gas emission is more than 94.5-99% can be improved by adopting the structure, and the efficient utilization of VOCs organic waste gas adsorption and desorption spaces by the rotating wheel part 10 is realized.

In practical arrangement, the space where the rotating wheel 11 is located may be divided into twelve equally divided sector areas along the circumferential direction, one of the sector areas is the desorption area 101, the other eleven sectors are the adsorption area 102, that is, the central angle corresponding to the desorption area 101 is 30 degrees, and the central angle corresponding to the adsorption area 102 is 330 degrees. Of course, in practical applications, the range of the desorption region 101 may be set to be larger, and accordingly, the range of the adsorption region 102 may be reduced, depending on the application requirements.

In practical application, two rotary wheels 11 can be designed with equal thickness, and compared with the original structure, the rotary wheel 11 can be regarded as being divided into two rotary wheels 11 with equal thickness by using the original molecular sieve rotary wheel, for example, the thickness of the original molecular sieve rotary wheel is 400mm or 500mm, and after the scheme provided by the present disclosure is applied, the rotary wheel 11 with 200mm or 250mm thickness is divided into two rotary wheels 11, so that the same material is used, and under the condition that the whole size is kept unchanged, the adsorption effect of the rotary wheel 11 rotating in two opposite directions provided by the embodiment is better.

In addition, when the rotating wheel part 10 is seriously blocked, only one rotating wheel 11 can be replaced, so that the material cost is saved.

In a specific scheme, each rotating wheel 11 is arranged in a relatively closed shell, and a partition plate can be arranged in the shell to separate the adsorption area 102 from the desorption area 101, so that gas is prevented from streaming in the shell.

In a specific embodiment, the space between the two rotating wheels 11 is closed by a sealing ring 12, and a partition (not shown in the figure) is arranged in the sealing ring 12, and the partition is used for separating the space between the two rotating wheels 11 from the area corresponding to the adsorption area 102 and the area corresponding to the desorption area 101, so that the situation that the adsorption of the adsorption area 102 and the desorption area 101 are affected by the cross flow of the VOCs waste gas Q1 and the desorption gas Q2 in the space is avoided.

In this embodiment, the VOCs exhaust treatment system includes two driving components for driving the two rotating wheels 11 to rotate. The structure of the driving part can be variously arranged, a simpler and more convenient way is to arrange a motor 60 and a transmission part, the transmission part can comprise a transmission wheel and a transmission belt 70, the transmission wheel can be specifically and fixedly connected to the output shaft of the motor 60, the transmission wheel and the rotating wheel 11 are connected through the transmission of the transmission belt 70, the rotation of the rotating wheel 11 is realized, and of course, the two motors 60 drive the two rotating wheels 11 to rotate in opposite directions.

In this embodiment, a filter 20 is further provided upstream of the rotating wheel portion 10 along the flow direction of the VOCs exhaust gas, that is, the filter 20 is provided on the left side of the rotating wheel portion 10 as shown in the figure, and the VOCs exhaust gas Q1 passes through the filter 20 and then the rotating wheel portion 10, so that the VOCs exhaust gas Q1 is filtered first, and then the VOCs are removed by adsorption, thereby increasing the adsorption amount.

Specifically, a first fan 30 is further provided downstream of the rotating wheel section 10 in the flow direction of the VOCs off-gas Q1 to adjust the flow rate of the VOCs off-gas Q1 according to actual needs.

In order to improve the desorption effect, a heater 40 is provided at a position corresponding to the desorption region 101, the heater 40 is specifically provided upstream of the rotary wheel portion 10 in the flow direction of the desorption gas Q2, that is, the heater 40 is provided on the right side of the rotary wheel portion 10 in the illustrated orientation, and the desorption gas Q2 is heated by the heater 40, then flows through the desorption region 101, and is subjected to desorption treatment at a portion where the rotary wheel 11 rotates to the desorption region 101.

Accordingly, the second fan 50 may be provided on the left side of the rotary wheel section 10, i.e., downstream of the rotary wheel section 10 in the flow direction of the desorption gas Q2, to adjust the flow rate of the desorption gas Q2.

The VOCs waste gas treatment system provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A VOCs waste gas treatment system is characterized by comprising a rotating wheel part, wherein the rotating wheel part comprises two rotating wheels which are coaxially arranged and have the same diameter, and the space where the rotating wheel part is located is divided into a fan-shaped desorption area and a fan-shaped adsorption area by taking the rotating center of the rotating wheels as the circle center; the adsorption zone is used for VOCs waste gas to pass through, and the desorption zone is used for desorption gas to pass through; the rotating directions of the two rotating wheels are opposite, and the rotating speed of the upstream rotating wheel is greater than that of the downstream rotating wheel along the flow direction of the VOCs waste gas; the flow direction of the VOCs waste gas is opposite to the flow direction of the desorption gas.

2. A VOCs exhaust treatment system as claimed in claim 1 wherein the two rotating wheels are of the same thickness.

3. A VOCs effluent treatment system as claimed in claim 1 wherein the space between the two rotating wheels is closed by a sealing ring having a partition therein for separating the area of the space corresponding to the adsorption zone from the area corresponding to the desorption zone.

4. The system of claim 1 wherein the desorption zone has a central angle of 30 degrees and the adsorption zone has a central angle of 330 degrees.

5. A VOCs exhaust treatment system according to any of claims 1-4 further comprising two drive members for driving rotation of two of said rotating wheels, respectively.

6. A VOCs waste gas treatment system according to claim 5, wherein the driving member comprises a motor and a transmission member, the transmission member comprises a driving wheel and a transmission belt, the driving wheel is fixedly connected with an output shaft of the motor, and the transmission belt is in transmission connection with the driving wheel and the rotating wheel.

7. A VOCs exhaust treatment system according to any of claims 1-4 wherein a filter is provided upstream of the rotating wheel section in the flow direction of the VOCs exhaust.

8. A VOCs exhaust treatment system according to any of claims 1-4 wherein a first fan is located downstream of the rotating wheel section in the direction of flow of the VOCs exhaust.

9. A VOCs exhaust treatment system according to any of claims 1-4 further comprising a heater for heating the desorption gas that passes through the heater and then through the desorption zone.

10. A VOCs exhaust treatment system as claimed in claim 9, further comprising a second fan located on a different side of the rotating wheel section from the heater and corresponding to the location of the desorption zone.