Exhaust Gas Purification System

Abstract

The waste gas purification system includes a gas container 12, a gas input unit 13 for intermittently introducing waste gas into the gas container 12, a gas discharge unit 14 for discharging the waste gas from the gas container 12 after it has been purified, and a pollutant capture device 2 disposed within the gas container 12 and including a capture device 21 for adhering particulate matter in the waste gas with a sticky substance to purify the waste gas. The length of the operating period during which the gas input unit 13 allows waste gas to enter the gas container 12 does not exceed 60 seconds. The length of the downtime during which the gas input unit 13 does not allow waste gas to enter the gas container 12 does not exceed 30 minutes.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to apparatus for treating waste gases, and more particularly to waste gas cleaning systems. [Background technology]

[0002] With the development of industry, many factories have installed equipment that burns fuel to create high-temperature environments for high-temperature processing. These equipment typically use coal or fossil fuels, generating large amounts of waste gases. These waste gases typically contain harmful substances, such as particulate pollutants, sulfur oxides, and hydroxides. In addition to the equipment used in factories, other machinery, such as transportation vehicles, also produces waste gases during operation. To prevent these waste gases from being directly released into the atmosphere and causing pollution, environmental protection regulations set emission standards for the waste gases and fumes generated by these equipment and machinery. Therefore, industrial industries typically install waste gas purification systems on their equipment and machinery to purify the waste gases.

[0003] Chinese Patent Application Publication No. 103212257 discloses a conventional exhaust gas purification system. The conventional exhaust gas purification system includes a casing and a viscous wall disposed within the casing. The casing has two openings, one for allowing exhaust gas to flow into the casing and the other for discharging the purified exhaust gas from the casing. The viscous wall has a silica-based polymer viscous liquid distributed in a fluid state on its surface, which adheres particulate matter in the exhaust gas to purify the exhaust gas. However, the conventional exhaust gas purification system has a problem of low purification efficiency. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION It is therefore an object of the present disclosure to provide an exhaust gas cleaning system that can alleviate the drawbacks of the prior art. [Means for solving the problem]

[0005] According to the present disclosure, an exhaust gas purification system includes a gas container, a gas injection unit, a gas discharge unit, and a pollutant capture device. The gas injection unit is for intermittently introducing exhaust gas into the gas container. The length of an operating time during which the gas injection unit allows the exhaust gas to be introduced into the gas container does not exceed 60 seconds. The length of an inactive time during which the gas injection unit does not allow the exhaust gas to be introduced into the gas container does not exceed 30 minutes. The gas discharge unit is for discharging the exhaust gas from the gas container after the exhaust gas has been purified. The pollutant capture device is disposed in the gas container and includes a capture device that uses an adhesive material to adhere particulate matter in the exhaust gas to purify the exhaust gas. [Brief explanation of the drawings]

[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description of the embodiments, which proceeds with reference to the accompanying drawings. [Figure 1] 1 is a partial schematic diagram illustrating a first embodiment of an exhaust gas purification system of the present disclosure. [Figure 2] FIG. 1 is a block diagram illustrating a first embodiment. [Figure 3] FIG. 2 is a block diagram illustrating a second embodiment of an exhaust gas cleaning system of the present disclosure. [Figure 4] FIG. 2 is a partial schematic diagram illustrating a third embodiment of the exhaust gas purification system of the present disclosure. [Figure 5] FIG. 10 is a partial schematic view illustrating a fourth embodiment of the exhaust gas purification system of the present disclosure. [Figure 6] FIG. 10 is a partial schematic view illustrating a fifth embodiment of the exhaust gas purification system of the present disclosure. [Figure 7] FIG. 10 is a partial schematic diagram illustrating a sixth embodiment of the exhaust gas purification system of the present disclosure. [Figure 8] FIG. 10 is a partial schematic view illustrating a seventh embodiment of the exhaust gas purification system of the present disclosure. [Figure 9] FIG. 10 is a partial schematic diagram illustrating an eighth embodiment of the exhaust gas purification system of the present disclosure. [Figure 10] FIG. 10 is a partial schematic view illustrating a ninth embodiment of the exhaust gas purification system of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0007] Before describing this disclosure in more detail, it should be noted that, where considered appropriate, reference numerals or terminal portions of reference numerals have been repeated among the figures to indicate corresponding or analogous elements, which may optionally have similar characteristics.

[0008] 1 and 2, a first embodiment of the presently disclosed exhaust gas cleaning system is adapted to be connected to an exhaust gas generating device (not shown) that generates exhaust gas, to receive and clean the exhaust gas from the exhaust gas generating device, and to discharge the cleaned exhaust gas from the exhaust gas cleaning system. The exhaust gas cleaning system of this embodiment includes a gas flow control device 1, a pollutant capture device 2, and an equipment control device 3.

[0009] The gas flow control device 1 includes a gas container 12 defining a purification space 11, at least one gas input unit 13 connected to the waste gas generating device for intermittently introducing waste gas into the purification space 11 of the gas container 12, and at least one gas exhaust unit 14 for exhausting the waste gas from the purification space 11 of the gas container 12 after the waste gas has been purified. In this embodiment, the gas flow control device 1 includes one gas input unit 13 and one gas exhaust unit 14, although the disclosure is not limited to this form. In some embodiments, the gas flow control device 1 can further (but not necessarily) include an exhaust fan 15 attached to the gas exhaust unit 14 to assist in exhausting the purified waste gas from the gas container 12.

[0010] In this embodiment, the gas input unit 13 is attached to the gas container 12, has an opening 131 formed therein, and includes a nozzle configured to intermittently introduce (e.g., by injection) waste gas generated in the waste gas generating appliance through the opening 131 into the purification space 11 of the gas container 12. The gas discharge unit 14 includes an opening formed on the side of the gas container 12 opposite the gas input unit 13 (e.g., in FIG. 1 , the gas input unit 13 is located at the top of the gas container 12 and the gas discharge unit 14 is located at the bottom of the gas container 12), although the disclosure is not limited to this form (i.e., the gas input unit 13 and the gas discharge unit 14 may not be located on opposite sides of the gas container 12). Each of the gas input unit 13 and the gas discharge unit 14 further includes a valve (not shown) operable to open or close the corresponding one of the gas input unit 13 and the gas discharge unit 14.

[0011] The pollutant capture device 2 is disposed in the gas container 12 and includes a capture device 21, a drive device 22, and a sticky substance supply device 23. The capture device 21 is configured to purify the waste gas by adhering particulate matter in the waste gas with a sticky substance. The drive device 22 is configured to drive the capture device 21 to move continuously. The sticky substance supply device 23 is configured to supply a sticky substance to the capture device 21. In this embodiment, the drive device 22 includes two rollers 221 disposed below the gas input unit 13 and a motor (not shown) connected to the rollers 221 to control the rotation of the rollers 221. The capture device 21 is a belt that is fitted around the rollers 221 and moves below the gas input unit 13 as the rollers 221 rotate. The capture device 21 may be inherently sticky or may not be inherently sticky. In some embodiments, the capture device 21 may be a tape (with or without a release paper) that extends from one roller 221 to another and moves under the gas input unit 13 as the rollers 221 rotate, a liquid sticky substance into which each of the rollers 221 is partially immersed, or other suitable element. The sticky substance supply device 23 can be omitted if the capture device 21 is inherently sticky. The structure of the drive device 22 can be changed if the structure of the capture device 21 is changed.

[0012] In this embodiment, the sticky substance supply device 23 continuously or intermittently sprays a sticky substance onto the surface of the capture device 21 facing the opening 131 of the gas input unit 13, and is disposed at a fixed position within the gas container 12. In some embodiments, the sticky substance supply device 23 can be driven to reciprocate or circulate parallel to the surface of the capture device 21, or can be driven to rotate about an axis parallel to the surface of the capture device 21. Furthermore, the sticky substance supply device 23 may spray the sticky substance onto the surface of the capture device 21, or may supply the sticky substance to the surface of the capture device 21 in other ways. Also, (a) the number of capture devices 21 included in the pollutant capture device 2 is not limited to one, and in other embodiments, may be two, three, or more than three, and (b) the number of sticky substance supply devices 23 included in the pollutant capture device 2 is not limited to one, and in other embodiments, may be two, three, or more than three.

[0013] The equipment control device 3 includes an air quality detector 31 (sometimes referred to in the market as an air quality monitor or air quality detection system), a controller 32, and a driver 33. The air quality detector 31 is disposed in the purification space 11 defined by the gas container 12 and is configured to detect the air quality of the waste gas in the purification space 11 (e.g., the concentration of particulate matter in the waste gas) and thereby generate an air quality signal indicative of the detected air quality of the waste gas. The controller 32 is communicatively connected to the air quality detector 31, the driver 33, the gas injection unit 13, the gas discharge unit 14, and the driver 22 and receives the air quality signal from the air quality detector 31. The driver 33 is connected to the gas injection unit 13. The controller 32 is configured to control the operation of the gas injection unit 13, the gas discharge unit 14, the driver 22, and the driver 33 based on the air quality of the waste gas indicated by the air quality signal.

[0014] The controller 32 is configured to control the operating state of the gas input unit 13 (i.e., whether it is open or closed) and the gas flow within the gas input unit 13 (including the gas flow rate within the gas input unit 13, the length of the operating time during which the gas input unit 13 allows waste gas to enter the gas container 12, and the length of the pause time during which the gas input unit 13 does not allow waste gas to enter the gas container 12). The length of the operating time does not exceed 60 seconds. The length of the pause time does not exceed 30 minutes. During the pause time, new waste gas does not flow into the purification space 11 to disturb the particulate matter suspended in the purification space 11, and the particulate matter suspended in the purification space 11 has sufficient time to fall onto the surface of the capture device 21, thereby promoting the purification effect. The controller 32 is further configured to control the operating state of the gas discharge unit 14 (i.e., whether it is open or closed) and the operating speed of the drive device 22 (e.g., the rotation speed of the roller 211 shown in FIG. 1). The controller 32 is further configured to control the driver 33 to drive the gas dosing unit 13 to move. In this embodiment, the gas dosing unit 13 is driven to move so that the distance to the surface of the capturing device 21 can be varied. The gas dosing unit 13 may reciprocate in a straight line that is not parallel to the surface of the capturing device 21 (e.g., in FIG. 1 , reciprocate in a straight line perpendicular to the surface of the capturing device 21), may reciprocate in a curve that is not on a plane parallel to the surface of the capturing device 21, may cycle in a plane that is not parallel to the surface of the capturing device 21, or may pivot about an axis that is not perpendicular to the surface of the capturing device 21. In this embodiment, the driver 33 is a motor-driven slide disposed on the gas container 12, but in other embodiments, it may be a linear actuator, a pneumatic cylinder, or other element. In some embodiments, the controller 32 may be further communicatively connected to the adhesive substance supply device 23 and may further control the operation of the adhesive substance supply device 23.

[0015] During operation, the controller 32 controls the drive device 22 to drive the trapping device 21 to move continuously. The adhesive substance supply device 23 sprays an adhesive substance on the surface of the trapping device 21 to maintain the adhesiveness of the adhesive substance on the surface of the trapping device 21. The controller 32 controls the operating states of the gas input unit 13 and the gas discharge unit 14 to direct the waste gas into the purification space 11 and further toward the surface of the trapping device 21. The adhesive substance on the surface of the trapping device 21 adheres particulate matter in the waste gas to purify the waste gas. The air quality detector 31 detects the air quality of the waste gas in the purification space 11 and generates an air quality signal indicative of the detected air quality of the waste gas. The controller 32 receives the air quality signal from the air quality detector 31 and controls the operation of the gas input unit 13, the gas discharge unit 14, the drive device 22, and the driver 33 based on the air quality signal. If the controller 32 determines that the air quality of the waste gas indicated by the air quality signal is worse than a first predetermined level, the controller 32 may shorten the operating time of the gas injection unit 13, reduce the gas flow rate in the gas injection unit 13, control the gas injection unit 13 to close immediately, control the driver 33 to drive the gas injection unit 13 closer to the surface of the capture device 21, or control the driver 21 to increase the operating speed of the driver 21 (to increase the rotational speed of the roller 211 shown in FIG. 1). If the controller 32 determines that the air quality of the waste gases, as indicated by the air quality signal, is better than a second predetermined level that is better than the air quality indicated by the first predetermined level, the controller 32 may extend the length of time that the gas input unit 13 is operating, increase the gas flow rate in the gas input unit 13, control the driver 33 to drive the gas input unit 13 away from the surface of the capture device 21, control the drive device 21 to slow down its operating speed (to slow down the rotational speed of the roller 211 shown in FIG. 1), or may control the drive device 21 to immediately stop operation (to stop the rotation of the roller 211 shown in FIG. 1). In this way, particulate matter in the waste gases can be effectively captured without generating excessive waste from the use of the capture device 21.If the controller 32 determines that the air quality of the waste gas indicated by the air quality signal complies with the emission standards, it controls the gas discharge unit 14 to open to discharge the purified waste gas from the gas container 12.

[0016] In some embodiments, the controller 32 may generate air pollution indices for the waste gas before and after purification by the pollutant capture device 2 based on the air quality when the waste gas first enters the gas container 12 and the air quality when the waste gas is discharged from the gas container 12, and output air pollution index (API) signals indicative of these air pollution indices. The device control device 3 may further include a display (not shown) communicatively connected to the controller 32 to receive the API signals and display the air pollution indices of the waste gas before and after purification according to the API signals, thereby allowing a user to know the improvement in the air quality of the waste gas.

[0017] Referring to FIG. 3 , a second embodiment of the exhaust gas purification system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in that the exhaust gas purification system further includes an environmental parameter control device 4. The environmental parameter control device 4 includes a temperature control device 41 and a humidity control device 42. The temperature control device 41 is arranged to adjust the exhaust gas to a predetermined temperature before the exhaust gas enters the gas container 12 via the gas input unit 13, and can be realized as a fan that blows air toward the side wall of the gas input unit 13 to lower the temperature of the exhaust gas inside the gas input unit 13, an air conditioner that blows cool or warm air toward the side wall of the gas input unit 13, or an electric heating tube embedded in the side wall of the gas input unit 13. The humidity adjustment device 42 is arranged to adjust the exhaust gas to a predetermined humidity before the exhaust gas enters the gas container 12 via the gas input unit 13, and can be realized as a dehumidifier or humidifier. By adjusting the temperature and humidity of the exhaust gas, the adhesiveness of the adhesive substance on the surface of the trapping device 21 can be optimized, and the purification efficiency of the pollutant trapping device 2 that adheres the particulate matter in the exhaust gas can be improved. In some variations of the second embodiment, the environmental parameter control device 4 may use only one of the temperature control device 41 and the humidity control device 42, or may further include other devices that can adjust environmental parameters. The location and structure of the devices for controlling environmental parameters should be known to those skilled in the art, and therefore details thereof will be omitted herein for the sake of brevity.

[0018] 4, a third embodiment of the exhaust gas cleaning system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in that the gas input unit 13 is driven by a driver 33 to move so that the projected position of the gas input unit 13 on the surface of the capture device 21 can be changed. The gas input unit 13 can move in a straight line that is not perpendicular to the surface of the capture device 21 (for example, parallel to the surface of the capture device 21 as shown in FIG. 4), or in a curve. In some embodiments, the gas input unit 13 can be driven to move so that both the distance from the gas input unit 13 to the surface of the capture device 21 and the projected position of the gas input unit 13 on the surface of the capture device 21 can be changed.

[0019] 5, a fourth embodiment of the exhaust gas cleaning system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in that the gas injection unit 13 is driven by a driver 33 to move so as to change the angle of the gas injection unit 13 relative to the surface of the trapping device 21. The driver 33 can be realized as a shaft that rotates the gas injection unit 13 about an axis that is not perpendicular to the surface of the trapping device 21 (e.g., parallel to the surface of the trapping device 21 as shown in FIG. 5). In some embodiments, the gas injection unit 13 can be driven to move so as to change the angle of the gas injection unit 13 relative to the surface of the trapping device 21 and to change at least one of the distance from the gas injection unit 13 to the surface of the trapping device 21 and the projected position of the gas injection unit 13 on the surface of the trapping device 21.

[0020] Referring to FIG. 6, the fifth embodiment of the waste gas purification system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in that the gas input unit 13 is formed with a plurality of openings 131 facing the surface of the capture device 21, thereby increasing the number of areas (and therefore the overall area) where sticky substances on the surface of the capture device 21 are exposed to the waste gas, thereby improving the purification efficiency.

[0021] 7, the sixth embodiment of the exhaust gas purification system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in that the gas flow control device 1 includes multiple gas input units 13, and the openings 131 of each of the gas input units 13 all face the surface of the capture device 21, increasing the number of areas (and therefore the overall area) where sticky substances on the surface of the capture device 21 are exposed to the exhaust gas, thereby improving the purification efficiency. In some variations of the sixth embodiment, each gas input unit 13 may have multiple openings 131 formed therein.

[0022] Referring to FIG. 8, the seventh embodiment of the waste gas purification system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in that the gas flow control device 1 further includes a reflector 16, that the sticky substance supply device 23 is driven to move, and in the structure of the pollutant capture device 2. In the seventh embodiment, the pollutant capture device 2 does not include the drive device 22 shown in FIG. 1. The capture device 21 is a band that is placed at a fixed position below the gas input unit 13 and can be replaced with a new one as needed. In this embodiment, the capture device 21 is essentially non-sticky, but may be essentially sticky in other embodiments. The sticky substance supply device 23 reciprocates or circulates parallel to the surface of the capture device 21 facing the opening 131 of the gas input unit 13, spraying the sticky substance over the entire surface of the capture device 21. The reflector 16 is attached to the gas injection unit 13 and extends radially outward from the gas injection unit 13 above the opening 131 of the gas injection unit 13. This allows particulate matter in the exhaust gas that bounces up from the surface of the trapping device 21 to be returned by the reflector 16. This shortens the time it takes for the particulate matter in the exhaust gas to leave the surface of the trapping device 21 and float in the purification space 11, increasing the likelihood that the particulate matter in the exhaust gas will be captured (adhered) to the sticky substance on the surface of the trapping device 21. Increasing the area of ​​the reflector 16 can further increase the likelihood that the particulate matter in the exhaust gas will be captured by the sticky substance on the surface of the trapping device 21. Note that the number of reflectors 16 included in the gas flow control device 1 is not limited to one, and may be two, three, or more in other embodiments. In some variations of the seventh embodiment, the pollutant capture device 2 may have the same structure as that of the first embodiment shown in FIG. 1 or another structure.

[0023] Referring to FIG. 9, the eighth embodiment of the exhaust gas purification device according to the present disclosure is similar to the seventh embodiment, but differs from the seventh embodiment in that the reflector 16 has a surface 161 on which an adhesive material is distributed to adhere particulate matter in the exhaust gas, thereby increasing the likelihood of capturing particulate matter in the exhaust gas.

[0024] Referring to FIG. 10 , the ninth embodiment of the exhaust gas purification system according to the present disclosure is similar to the first embodiment, but differs from the first embodiment in the structure of the pollutant capture device 2 and the method of moving the gas input unit 13. In the ninth embodiment, the drive device 22 further includes a transmission belt 222 that is fitted around a roller 221 and moves below the gas input unit 13 as the roller 221 rotates. The pollutant capture device 2 includes a plurality of capture devices 21 that are sequentially fed onto the transmission belt 222 and move together with the transmission belt 222 as the roller 221 rotates, passing sequentially below the gas input unit 13. Each capture device 21 is a plate with a sticky substance distributed on its surface to stick particulate matter in the exhaust gas. In this embodiment, the capture device 21 is essentially sticky, in which case the sticky substance supply device 23 can be omitted. However, in other embodiments, the capture device 21 may not be essentially sticky, in which case the sticky substance supply device 23 is required. If the capture device 21 is inherently sticky and the sticky substance supply device 23 is not omitted, the sticky substance supply device 23 supplies a sticky substance to the surface of the capture device 21 to maintain the stickiness of the sticky substance on the surface of the capture device 21. The gas input unit 13 intermittently supplies waste gas to the gas container 12, so that the surfaces of the capture devices 21 are exposed to the waste gas one by one. The driver 33 is configured to drive the gas input unit 13 to move so that the projected position of the gas input unit 13 on the surface of the transmission belt 222 can be changed, and may be a motor-driven slide as shown in FIG. 10. The exhaust gas purification system may further include a supply device (not shown) for sequentially supplying capture devices 21 to the transmission belt 222, and a receiving device (not shown) for sequentially receiving capture devices 21 contaminated with particulate matter in the exhaust gas (i.e., having particulate matter in the waste gas stuck to them) from the transmission belt 222. It should be noted that supplying and receiving devices will be known to those skilled in the art and therefore details thereof will be omitted herein for the sake of brevity.

[0025] According to the above, in each of the above embodiments, the gas input unit(s) 13 are configured to be able to intermittently input waste gas into the gas container 12, so that the waste gas can be effectively purified by appropriately determining the length of the operating time and rest time of the gas input unit(s) 13.

[0026] For purposes of explanation, numerous specific details have been set forth above to facilitate a thorough understanding of the embodiments. However, it will be apparent to one skilled in the art that one or more other embodiments may be practiced without these specific details. Furthermore, in the description of "one embodiment" or "an embodiment" herein, all references to "one embodiment" or "an embodiment" accompanied by an ordinal number or other designation should be understood to include specific aspects, structures, and features of the present disclosure. Furthermore, although multiple variations may be incorporated into a single embodiment, drawing, or description thereof, this is for the purpose of streamlining the description and understanding the multifaceted aspects of the present disclosure. Furthermore, one or more features or specific embodiments of one embodiment may, where appropriate, be combined with one or more features or specific embodiments of other embodiments in the implementation of the present disclosure.

[0027] While the present disclosure has been described in connection with what are considered to be exemplary embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments, but is intended to cover various arrangements within the broadest spirit and scope so as to encompass all such modifications and equivalent arrangements. [Explanation of symbols]

[0028] 1 Gas flow control devices 11 Purification Space 12 Gas bottles 13 Gas input unit 131 Aperture 14 Gas exhaust unit 15 Ventilation fan 16 Reflector 161 Surface 2. Pollutant capture devices 21 Capture device 22 Drive unit 221 Laura 222 Transmission belt 23 Adhesive substance supply device 3 Device control equipment 31 Air Quality Detector 32 Controller 33 Driver 4. Environmental parameter control equipment 41 Temperature control device 42 Humidity control device

Claims

1. Gas containers and a gas dosing unit for intermittently admitting waste gas into said gas container; a gas exhaust unit for exhausting the waste gas from the gas container after the waste gas has been purified; a pollutant capture device disposed in the gas container and including a capture device that uses a sticky substance to adhere particulate matter in the exhaust gas to purify the exhaust gas; an equipment control device including an air quality detector and a controller; the air quality detector is disposed within the gas bottle and is configured to detect an air quality of waste gas within the gas bottle and to generate an air quality signal indicative of the air quality of the waste gas; The controller is communicatively connected to the air quality detector to receive the air quality signal, and is further communicatively connected to the gas injection unit, and is configured to control, based on the air quality of the waste gas indicated by the air quality signal, the length of the operation time and the length of the pause time of the gas injection unit during which waste gas is allowed to enter the gas container does not exceed 60 seconds, and the length of the pause time during which the gas injection unit does not allow waste gas to enter the gas container is sufficient to prevent new waste gas from entering the gas container and disturbing particulate matter suspended in the gas container, and for the particulate matter suspended in the gas container to fall to the surface of the capture device.

2. 10. The exhaust gas cleaning system of claim 1, further comprising a driver configured to drive the gas input unit to move such that the distance from the gas input unit to the surface of the capture device is variable.

3. 2. The exhaust gas cleaning system of claim 1, further comprising a driver configured to drive the gas injection unit to move so that a projected position of the gas injection unit on the surface of the capture device can be changed.

4. 10. The exhaust gas cleaning system of claim 1, further comprising a driver configured to drive the gas injection unit to move such that the angle of the gas injection unit relative to the surface of the capture device can be varied.

5. 10. The exhaust gas cleaning system of claim 1, wherein the pollutant capture device includes a plurality of the capture devices, each surface of the capture devices being exposed to the exhaust gas one at a time.

6. The exhaust gas cleaning system of claim 1 , further comprising an exhaust fan attached to the gas exhaust unit.

7. The waste gas purification system of claim 1, wherein the controller is configured to further control the gas flow rate in the gas injection unit based on the air quality of the waste gas indicated by the air quality signal.

8. 2. The exhaust gas cleaning system according to claim 1, wherein the gas input unit is formed with a plurality of openings facing the surface of the capture device.

9. 2. The exhaust gas cleaning system of claim 1, comprising a plurality of said gas input units, each of said gas input units having an opening formed therein through which exhaust gas enters said gas container, said opening facing said surface of said capture device.

10. 2. The exhaust gas cleaning system of claim 1, wherein the gas input unit defines an opening through which exhaust gas enters the gas container, and the exhaust gas cleaning system further comprises a reflector attached to the gas input unit and extending radially outward from the gas input unit above the opening in the gas input unit.

11. 11. The exhaust gas purification system according to claim 10, wherein the reflector has a surface on which an adhesive material is distributed to make particulate matter in the exhaust gas adhere.

12. The contaminant capture device further includes a drive configured to drive the capture device to move continuously; 2. The exhaust gas cleaning system of claim 1, wherein the controller is further communicatively connected to the drive device and configured to control the drive device to increase its operating speed when the air quality of the exhaust gas indicated by the air quality signal is worse than a first predetermined level, and to control the drive device to decrease its operating speed when the air quality of the exhaust gas indicated by the air quality signal is better than a second predetermined level that is better than the air quality represented by the first predetermined level.

13. 2. The exhaust gas cleaning system of claim 1, further comprising an environmental parameter control device including a temperature control device arranged to condition the exhaust gas to have a predetermined temperature before the exhaust gas enters the gas container via the gas input unit.

14. 10. The exhaust gas cleaning system of claim 1, further comprising an environmental parameter control device including a humidity control device arranged to condition the exhaust gas to have a predetermined humidity before the exhaust gas enters the gas container via the gas input unit.

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