CN215692993U - Exhaust gas treatment system - Google Patents
Exhaust gas treatment system Download PDFInfo
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- CN215692993U CN215692993U CN202120968150.7U CN202120968150U CN215692993U CN 215692993 U CN215692993 U CN 215692993U CN 202120968150 U CN202120968150 U CN 202120968150U CN 215692993 U CN215692993 U CN 215692993U
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Abstract
The present disclosure relates to an exhaust treatment system comprising a filtering device; an exhaust gas treatment unit through which gas is purified after flowing through the filtering device, the exhaust gas treatment unit including: a combustion chamber; a heat exchange section; the waste gas treatment system comprises a waste gas treatment module, an adsorption zone, a desorption zone and a cooling zone, wherein zeolite can sequentially rotate to pass through the three zones, one part of gas entering the waste gas treatment module enters the adsorption zone and the adsorbed gas is discharged to the atmosphere through an adsorption pipeline, the other part of the gas entering the waste gas treatment module firstly passes through the cooling zone, then enters the heat absorption side of a heat exchange part through a cooling pipeline, then enters the desorption zone through a desorption pipeline, then enters a combustion chamber for combustion, and the combusted gas enters the heat release side of the heat exchange part and is finally discharged to the atmosphere.
Description
Technical Field
The present disclosure relates to an exhaust gas treatment system.
Background
Many processes in automotive manufacturing will generate exhaust gases, such as paint spray shops. The VOC content of the exhaust gases generated in, for example, spray shops is generally very high, reaching about 300mg/m3Or even higher concentrations, which exhaust gas is not allowed to be discharged directly into the air. The exhaust gas needs to be treated to reduce the VOC in the exhaust gas to an acceptable level before it can be discharged into the air.
Further, in the automobile manufacturing industry, the amount of exhaust gas generated is generally very large, on the order of tens of thousands to tens of thousands of cubic meters per hour, and therefore, it is necessary to be able to perform not only effective treatment of exhaust gas but also treatment of a large amount of exhaust gas stably and efficiently. Insufficient exhaust gas treatment capacity may have an impact on plant capacity, and a brief failure of the exhaust gas treatment system may result in plant shutdown or even exhaust gas being discharged directly into the air, causing severe air pollution.
SUMMERY OF THE UTILITY MODEL
The present disclosure provides an exhaust gas treatment system that can effectively reduce the concentration of VOC in exhaust gas and can also stably and efficiently perform treatment of a large amount of exhaust gas.
According to one or more aspects of the present disclosure, the present disclosure relates to an exhaust gas treatment system, comprising: the device comprises a filtering device and an exhaust gas treatment unit, wherein gas flows through the filtering device and is purified by the exhaust gas treatment unit, and the exhaust gas treatment unit comprises a combustion chamber; a heat exchange section; an exhaust gas treatment module including a runner device provided with zeolite and including an adsorption zone, a desorption zone, and a cooling zone through which zeolite can sequentially rotate, an adsorption line, a desorption line, and a cooling line, a portion of gas entering the exhaust gas treatment module entering the adsorption zone and adsorbed gas being discharged to the atmosphere via the adsorption line, another portion of gas entering the exhaust gas treatment module first passing through the cooling zone, then entering a heat absorption side of a heat exchange portion via the cooling line, then entering the desorption zone via the desorption line, then entering a combustion chamber for combustion, and burned gas entering a heat release side of the heat exchange portion and finally being discharged to the atmosphere.
According to one or more aspects of the present disclosure, the exhaust treatment system includes at least two exhaust treatment units coupled in parallel.
According to one or more aspects of the present disclosure, the exhaust treatment unit includes at least two exhaust treatment modules coupled in parallel.
According to one or more aspects of the present disclosure, the exhaust gas treatment system includes a valve disposed upstream of the filtering device and a valve disposed between the desorption zone and the combustion chamber, and further includes a first fresh air line and a second fresh air line each having a valve, the first fresh air line being located between the filtering device and the exhaust gas treatment module, the second fresh air line being located between the valve between the desorption zone and the combustion chamber.
According to one or more aspects of the disclosure, zeolite can be purged when a valve in the first fresh air line is opened and air is passed in, with a valve located upstream of the filtration device closed, and the combustion chamber can be purged when a valve between the desorption zone and the combustion chamber is closed and a valve in the second fresh air line is opened and air is passed in.
According to one or more aspects of the present disclosure, with the valve located upstream of the filtering device closed, the exhaust gas treatment system can be preheated when the valve in the first fresh air line is opened and air is blown in while the valve between the desorption zone and the combustion chamber is opened and the valve in the second fresh air line is closed.
According to one or more aspects of the present disclosure, in the case where the valve in the first fresh air line and the valve in the second fresh air line are closed, when the valve upstream of the filtering device is opened and the valve between the desorption region and the combustion chamber is opened while introducing the exhaust gas, the exhaust gas can be purified.
According to one or more aspects of the present disclosure, the cooling line can be connected to a portion of the desorption line upstream of the desorption zone via a bypass valve.
According to one or more aspects of the present disclosure, a differential pressure sensor is provided for the filter device for detecting a pressure difference between an entry side and an exit side of the filter device.
According to one or more aspects of the present disclosure, a pressure difference sensor is provided for the zeolite for detecting a pressure difference between an entry side and an exit side of the zeolite.
Drawings
FIG. 1 is a schematic illustration of an exhaust treatment system according to the present disclosure;
Detailed Description
The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the disclosure. It should be understood, however, that the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, the embodiments described below are intended to provide a more complete disclosure of the present disclosure, and to fully convey the scope of the disclosure to those skilled in the art. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.
It should be understood that like reference numerals refer to like elements throughout the several views. In the drawings, the size of some of the features may be varied for clarity.
It is to be understood that the terminology used in the description is for the purpose of describing particular embodiments only, and is not intended to be limiting of the disclosure. All terms (including technical and scientific terms) used in the specification have the meaning commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.
As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. The terms "comprising," "including," and "containing" when used in this specification specify the presence of stated features, but do not preclude the presence or addition of one or more other features. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. The terms "between X and Y" and "between about X and Y" as used in the specification should be construed to include X and Y. The term "between about X and Y" as used herein means "between about X and about Y" and the term "from about X to Y" as used herein means "from about X to about Y". "upstream" and "downstream" are described with respect to the direction of flow of a gas or liquid. Further, in the drawings, the lines crossing in solid form indicate communication between crossing lines at the crossing points, and the lines crossing in blank form indicate non-communication between crossing lines at the crossing points.
The present disclosure relates generally to a parallel-type redundancy-designed exhaust gas treatment system including a plurality of exhaust gas treatment units arranged in parallel, so that not only a large amount of exhaust gas can be treated, but also the parallel-type design provides excellent safety redundancy, greatly reducing the risk that the entire production line may be affected and even air pollution may be caused when a single exhaust gas treatment unit generates a malfunction such as a blockage. In addition, at least one of the exhaust gas treatment units is also provided with a plurality of exhaust gas treatment modules arranged in parallel, each exhaust gas treatment module can independently perform exhaust gas treatment, and the safe and redundant design of the whole system can be further ensured. The exhaust treatment system of the present disclosure will be described in further detail later with reference to fig. 1.
FIG. 1 is a schematic illustration of an exhaust treatment system according to the present disclosure. The exhaust gas treatment system shown in fig. 1 includes an exhaust gas treatment unit a and an exhaust gas treatment unit B, which are arranged in parallel. It should be understood that the number of the exhaust gas treatment units in the present embodiment is not limited to two, but may be provided in plural. In this embodiment, the exhaust gas treatment unit a includes an exhaust gas treatment module a1, an exhaust gas treatment module a2, an exhaust gas treatment module A3, and an exhaust gas treatment module a4, and the exhaust gas treatment unit B includes an exhaust gas treatment unit B1 and an exhaust gas treatment unit B2. It should be understood that the number of the exhaust gas treatment units a and B in the present embodiment is not limited to the respective four and two, but may be provided in plural. Further, in the present embodiment, the basic configuration of each exhaust gas treatment module is similar, and only the exhaust gas treatment module a1 will be generally described hereinafter, and the configuration thereof can be applied to other exhaust gas treatment modules as well.
As shown in fig. 1, the exhaust gas treatment system includes a filter device 10, and an exhaust gas treatment unit a and an exhaust gas treatment unit B are disposed downstream of the filter device 10 in the direction of flow of exhaust gas, and in the present embodiment, one filter device 10 is provided for two exhaust gas treatment units, and it is contemplated that one filter device may be provided for each exhaust gas treatment unit. The exhaust gas first passes through the filter device 10 to filter out, for example, large particulate matter to prevent damage or plugging of subsequent exhaust treatment modules. In this embodiment, the filter device 10 is provided with two filter units. Each filter unit may be provided with a differential pressure sensor 101 which may be used to detect a pressure difference between the exhaust gas entrance end and the exhaust gas exit end, and determine that the filter unit is clogged when the pressure difference is greater than a predetermined threshold value for a predetermined time. In this embodiment, the two filter units may be arranged in parallel or in series, and in the case of parallel arrangement, when one filter unit may be clogged, the other filter unit may continue to operate, and in the case of series arrangement, when one filter unit may be clogged, the filter element of the filter unit that may malfunction may be quickly detached so that the other filter unit may continue to operate.
The exhaust gas exiting the filter apparatus 10 then enters two parallel exhaust gas treatment units a and B, respectively, and more specifically four parallel exhaust gas treatment modules a1-a4, respectively, in exhaust gas treatment unit a and two parallel exhaust gas treatment modules B1-B2, respectively, in exhaust gas treatment unit B. The basic construction will be described generally below only with respect to exhaust treatment module a 1.
The exhaust gas treatment system further comprises a combustion chamber 20 in which the exhaust gas having a high concentration of VOC is subjected to a combustion treatment, and a heat exchange portion 30 in which the gas of different flow directions is subjected to heat exchange, the functions of which will be described in more detail below with reference to the exhaust gas treatment module. In the present embodiment, one combustion chamber and heat exchange portion are provided for each exhaust gas treatment system, and it should be understood that one combustion chamber and heat exchange portion may be provided for each exhaust gas treatment module in each exhaust gas treatment system.
The exhaust treatment module a1 includes a wheel assembly 40. In this embodiment, the rotary wheel device 40 includes zeolite for adsorbing and desorbing VOC and the like in the exhaust gas. The zeolite is capable of adsorbing VOCs at lower temperatures and desorbing adsorbed VOCs at higher temperatures. It should be understood that other types of adsorbent and desorbent materials having similar forms may be used in the rotor assembly. The wheel apparatus 40 includes an adsorption zone 41, a desorption zone 42, and a cooling zone 43. In this embodiment, the zeolite is rotated counterclockwise by, for example, a motor or the like, so that all portions of the zeolite are continuously rotated through the adsorption zone 41, desorption zone 42 and cooling zone 43 in this order. In the adsorption zone 41, the temperature of the zeolite is low, and the VOC in the exhaust gas is adsorbed, while in the desorption zone 42, the temperature of the zeolite is increased due to the passage of the high-temperature gas from the heat exchanger, so that the VOC adsorbed in the zeolite is desorbed and taken away by the portion of the high-temperature gas, the desorbed zeolite can be reused for adsorption after the temperature is reduced, and the cooling zone 43 is used for cooling the desorbed zeolite by the low-temperature exhaust gas, so that it can be reused for adsorbing the VOC subsequently. Therefore, the adsorption zone 41, the desorption zone 42 and the cooling zone 43 are sequentially passed by the zeolite counterclockwise without stopping, so that the adsorption, desorption and cooling processes of the zeolite can be cyclically performed. This will be described in more detail below with reference to the flow of exhaust gas.
The exhaust gas treatment module a1 comprises an adsorption line 51, a desorption line 52 and a cooling line 53, the adsorption line 51 extending from the adsorption zone 41 to the atmosphere, the desorption line 52 extending from the heat exchange section (more specifically the heat absorption side of the heat exchange section 30) through the desorption zone 42 and then again through the heat exchange section (more specifically the heat release side of the heat exchange section 30), the cooling line 53 extending from the cooling zone 43 to the heat exchange section (more specifically the heat absorption side of the heat exchange section 30).
Most of the exhaust gas passing through the filtering device 10 is transferred through the adsorption zone 41, VOC in the exhaust gas is adsorbed into zeolite in the adsorption zone 41, and the purified gas is directly discharged into the atmosphere via the adsorption line 51. In a preferred embodiment, the exhaust gas treatment module a1 may also include a concentration sensor located immediately upstream of the exhaust port that allows exhaust only when it detects that the VOC concentration in the cleaned gas meets certain criteria.
Furthermore, a small portion of the exhaust gas passing through the filter device 10 is conveyed to the cooling zone 43, and since the temperature of this portion of the exhaust gas is low, the zeolite rotating from the desorption zone 42 to the cooling zone 43 can be cooled. The small portion of the exhaust gas after passing through the cooling zone 43 is then transferred to the heat exchange portion 30 via the cooling line 53, where the small portion of the exhaust gas after passing through the cooling zone 43 is heat exchanged with the exhaust gas combusted in the combustion chamber (this exhaust gas will be described later) at the heat exchange portion 30, so that the small portion of the exhaust gas after passing through the cooling zone 43 is increased in temperature after leaving the heat exchange portion 30.
The small portion of the exhaust gas having an increased temperature then flows back to the exhaust gas treatment module a1 via the desorption line 52 and passes through the desorption zone 42, which due to the higher temperature of the small portion of the exhaust gas causes the temperature of the zeolite in the desorption zone 42 to increase, whereupon the adsorbed VOC will desorb due to the characteristics of the zeolite, and the desorbed VOC is then carried away by the portion of the exhaust gas flowing through the desorption zone 42. This part of the exhaust gas is then directly introduced into the combustion chamber 20 to be subjected to combustion treatment for removing VOC carried in the exhaust gas, and the combusted exhaust gas is directly introduced into the heat exchange portion 30 to be subjected to the above-mentioned heat exchange due to the temperature rise, and is discharged to the air after the heat exchange.
That is, a small portion of the exhaust gas passing through the filtering device 10 passes through the cooling zone, the heat absorption side of the heat exchange portion, the desorption zone, the combustion chamber, and the heat release side of the heat exchange portion in this order, so that the small portion of the exhaust gas having passed through the desorption zone, which flows in first, can have a higher temperature after being combusted and exchange heat with the small portion of the exhaust gas flowing in later after passing through the cooling zone, and the small portion of the exhaust gas flowing in later is heated up to enable it to desorb the VOC in the zeolite later.
In this embodiment, the exhaust gas treatment unit a has four exhaust gas treatment modules, the exhaust gas treatment unit a being provided with a heat exchange portion where the exhaust gas leaving the respective desorption line 52 of each exhaust gas treatment module meets and a combustion chamber where the exhaust gas leaving the respective desorption zone of each exhaust gas treatment module meets at a point upstream of the combustion chamber. As described above, the exhaust gas leaving the desorption zone is directed to the combustion chamber for combustion. Furthermore, as shown in fig. 1, a bypass valve 551 may be provided between the portion of the desorption region upstream of the desorption region in the desorption line 52 and the cooling line 53, and the bypass valve 551 is capable of allowing the gas from the cooling line 53 to directly enter the desorption line 52 without entering the heat exchange portion. Typically, the heat exchange section is located between the cooling line 53 and the desorption line 52.
In addition, a plurality of fans can be arranged in the waste gas treatment unit A, so that the flow rate of gas can be increased conveniently.
In this embodiment, each of the wheel devices may also be provided with a differential pressure sensor, and the differential pressure sensor may be configured to detect a pressure difference between the exhaust gas inlet end and the exhaust gas outlet end, and determine that the wheel device is clogged when the pressure difference is greater than a predetermined threshold value for a predetermined time.
In the present exemplary embodiment, a valve 311 is provided upstream of the filter device 10, which valve 311 serves to control the introduction of exhaust gas. A first fresh air pipeline is arranged between the filtering device 10 and the exhaust gas treatment unit, a valve 611 is arranged in the first fresh air pipeline, and the valve 611 is used for introducing air to clean the zeolite and perform a preheating mode. A valve 522 is provided in the portion of the desorption line 52 downstream of the desorption zone, and the rate of exhaust gas entering the combustion chamber can be controlled by the degree of opening and closing of the valve 522. In addition, a second fresh air pipeline is arranged between the valve 522 and the combustion chamber 20, a valve 612 is arranged in the second fresh air pipeline, and the valve 612 is used for introducing air to clean the combustor and perform a preheating mode. Further, valves 511, 521 and 531 are provided in the adsorption line 51, the portion of the desorption line 52 upstream of the desorption zone, and the cooling line 53, respectively. The exhaust gas treatment system of the present embodiment can be switched among the purge mode, the warm-up mode, and the purge mode by the respective controls of the respective valves. Three modes according to the present embodiment will be described as follows.
In this embodiment, the exhaust treatment system or the exhaust treatment module includes a purge mode, a warm-up mode, and a purge mode. The purge mode includes purging the zeolite and purging the burner to remove waste from the zeolite and/or burner so that the zeolite and/or burner can function again efficiently. The preheating mode is configured to preheat the corresponding portion of the zeolite before the introduction of the exhaust gas so that the exhaust gas can be immediately purified when the exhaust gas is subsequently introduced, avoiding the exhaust gas which is not effectively treated at the beginning of the introduction phase from being discharged into the air. The purification mode is a mode as described above in detail with respect to the exhaust gas treatment unit, in which the exhaust gas is introduced into the exhaust gas treatment system, and adsorption, desorption, and cooling of the zeolite are achieved by diversion, combustion, heat exchange, and the like of the exhaust gas, so that the entire exhaust gas treatment system can be continuously operated. The operation of the three modes will be described in more detail below, and furthermore, the operation of the exhaust treatment module referred to below is also described only by way of example with respect to exhaust treatment module a, and the operation of exhaust treatment module B is similar to the corresponding operation of exhaust treatment module a.
In the purge mode, the valve 311 is closed so that the passage of exhaust gas is prohibited. For cleaning the zeolite, the valve 611 in the first fresh air pipeline is opened, and the valves 511, 521 and 531 are also opened, so that the air introduced through the first fresh air pipeline is directly discharged into the atmosphere after passing through the zeolite, and the cleaning of the zeolite is completed. For cleaning of the burner, the valve 522 is closed, the valve 612 in the second fresh air pipeline is opened, and air is introduced, at this time, the air introduced through the second fresh air pipeline is directly discharged to the atmosphere after passing through the burner, and cleaning of the burner is completed.
In the preheat mode, valve 311 remains closed such that the passage of exhaust gas is prohibited. Valve 611 in the first fresh air line and valves 511, 521 and 531 are all kept open. At the same time, valve 522 is opened and valve 612 in the second fresh air line is closed (preferably also by-pass valve 551). At this time, air is introduced through the first fresh air pipeline, the introduced air is circulated in the exhaust gas treatment module as described in detail above, that is, most of normal air passes through the adsorption zone, and a small part of normal air passes through the cooling zone and then is heated on the heat absorption side of the heat exchange portion, then flows through the desorption zone and enters the combustion chamber for combustion, and after being heated, the normal air returns to the heat release side of the heat exchange portion again to be cooled, and is discharged to the atmosphere after being cooled.
In the purge mode, valve 611 in the first fresh air line and valve 612 in the second fresh air line are closed and valves 511, 521, 531 and 522 are all open and the introduction of exhaust gas as detailed above begins normal treatment. That is, most of the exhaust gas passes through the adsorption region, is adsorbed and then is discharged into the atmosphere, and a small part of the exhaust gas passes through the cooling region and then is heated on the heat absorption side of the heat exchange portion, then flows through the desorption region and carries away the desorbed VOC to enter the combustion chamber for combustion, and after being heated, the exhaust gas is returned to the heat release side of the heat exchange portion again for cooling, and after being cooled, the exhaust gas is discharged into the atmosphere.
The structure and operation of the exhaust gas treatment unit a having four exhaust gas treatment modules are described above, and the structure and operation of the exhaust gas treatment unit B having two exhaust gas treatment modules are similar and will not be described again here.
Through the exhaust treatment unit of this embodiment, not only can handle very big waste gas, have high security and high efficiency simultaneously. For example, the treatment power of the exhaust gas treatment unit A can be up to 650,000m3The treatment capacity of the exhaust gas treatment unit B can reach 183,000m3The VOC concentration after treatment can be as low as 30mg/m3。
Furthermore, as shown in fig. 1, the exhaust treatment systems of the present disclosure may also include valves disposed at other locations in the pipeline to further control the flow of gas.
Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without substantially departing from the spirit and scope of the present disclosure. Accordingly, all changes and modifications are intended to be included within the scope of the present disclosure as defined in the appended claims. The disclosure is defined by the following claims, with equivalents of the claims to be included therein.
Claims (10)
1. An exhaust treatment system, comprising:
a filtering device is arranged on the upper portion of the filter,
an exhaust gas treatment unit through which gas is purified after flowing through the filtering device, the exhaust gas treatment unit comprising:
a combustion chamber;
a heat exchange section;
an exhaust gas treatment module including a runner device provided with zeolite and including an adsorption zone, a desorption zone, and a cooling zone through which zeolite can sequentially rotate, an adsorption line, a desorption line, and a cooling line, a portion of gas entering the exhaust gas treatment module entering the adsorption zone and adsorbed gas being discharged to the atmosphere via the adsorption line, another portion of gas entering the exhaust gas treatment module first passing through the cooling zone, then entering a heat absorption side of a heat exchange portion via the cooling line, then entering the desorption zone via the desorption line, then entering a combustion chamber for combustion, and burned gas entering a heat release side of the heat exchange portion and finally being discharged to the atmosphere.
2. The exhaust treatment system of claim 1, comprising at least two exhaust treatment units coupled in parallel.
3. The exhaust treatment system of claim 1, wherein the exhaust treatment unit includes at least two exhaust treatment modules coupled in parallel.
4. The exhaust treatment system of any of claims 1-3, comprising a valve disposed upstream of the filtering device and a valve disposed between the desorption zone and the combustion chamber, and further comprising a first fresh air line and a second fresh air line each having a valve, the first fresh air line being located between the filtering device and the exhaust treatment module, the second fresh air line being located between the valve between the desorption zone and the combustion chamber.
5. An exhaust gas treatment system according to claim 4, wherein zeolite can be purged when a valve in the first fresh air line is opened and air is passed, and the combustion chamber can be purged when a valve between the desorption zone and the combustion chamber is closed and a valve in the second fresh air line is opened and air is passed, with the valve upstream of the filter device closed.
6. The exhaust gas treatment system of claim 4, wherein the exhaust gas treatment system can be preheated while opening the valve in the first fresh air line and venting air while opening the valve between the desorption zone and the combustion chamber and closing the valve in the second fresh air line with the valve upstream of the filter device closed.
7. An exhaust gas treatment system according to claim 4, wherein with the valve in the first fresh air line and the valve in the second fresh air line closed, the exhaust gas can be purified when the valve upstream of the filter device is opened and the exhaust gas is introduced while the valve between the desorption zone and the combustion chamber is opened.
8. An exhaust gas treatment system according to any of claims 1-3, wherein the cooling line is connectable via a bypass valve to a portion of the desorption line upstream of the desorption zone.
9. An exhaust gas treatment system according to any of claims 1-3, characterized in that a pressure difference sensor is provided for the filter device for detecting a pressure difference between an entry side and an exit side of the filter device.
10. An exhaust gas treatment system according to any one of claims 1-3, characterized in that a pressure difference sensor is provided for the zeolite for detecting a pressure difference between the entry side and the exit side of the zeolite.
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| CN202120968150.7U CN215692993U (en) | 2021-05-08 | 2021-05-08 | Exhaust gas treatment system |
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| CN202120968150.7U CN215692993U (en) | 2021-05-08 | 2021-05-08 | Exhaust gas treatment system |
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| CN215692993U true CN215692993U (en) | 2022-02-01 |
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