Waste gas treatment system

Abstract

According to the waste gas treatment system, waste gas is introduced into a gas mixer, ozone generated by an ozone generator is output into the gas mixer to be mixed with the waste gas, the waste gas makes full contact with the ozone to be subjected to an oxidation reaction, and the waste gas obtained after preliminary reaction and the ozone enter a catalytic oxidation device; under the catalytic action of a catalyst of the catalytic oxidizer, a catalytic oxidation reaction is carried out, so that the waste gas, especially malodorous gas substances, can be converted into odorless small molecular compounds or completely mineralized to generate water and CO2, and the purified waste gas reaches the standard and is discharged through the exhaust assembly. Wherein the ozone concentration detector can be used for detecting the ozone concentration in the gas treated by the catalytic oxidizer, so that the amount of ozone generated by the ozone generator can be reasonably controlled, the operation and maintenance cost of equipment is reduced, and secondary pollution of ozone to air is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a waste gas treatment system. Background Art

[0002] Malodorous gas, as a kind of waste gas, is usually produced by chemical reactions, biological activities or the release of pollutants. It is a kind of pollution that can cause disgust or discomfort to the human body. It is a volatile gas that acts on the human sense of smell through the air medium and is perceived by the human sense of smell. It mostly comes from the chemical, pharmaceutical, paper, leather, fertilizer, food, foundry and other industries. Typical malodorous gases include chlorine, ammonia, hydrogen sulfide, mercaptans, fatty acids and other inorganic and organic compounds such as benzene, toluene, styrene, etc., which can cause varying degrees of toxicity to the human respiratory, digestive, cardiovascular, endocrine and nervous systems, and may even cause coma or death. Therefore, malodorous gases need to be effectively treated.

[0003] The methods for treating malodorous gases in related technologies include direct combustion, activated carbon adsorption, biological decomposition, spraying, plasma, membrane separation, oxidation and ultraviolet photolysis, etc., or any combination thereof. Among them, UV photolysis oxidation, as one of the more commonly used oxidation methods, uses high-energy ultraviolet light beams to generate a large number of free electrons in the air, which are converted into active oxygen (ozone), converting malodorous gas substances into odorless small molecular compounds or completely mineralizing them, thereby generating water and CO2.

[0004] However, the UV photolysis oxidation method is limited by the reaction conditions of UV lamps and light sources, has high energy consumption, and the ozone concentration produced is difficult to control. The short-term photolysis of malodorous gases is not complete, and it is easy to produce more complex intermediate by-products such as ketones and aldehydes, causing secondary pollution, resulting in a low degradation rate and failure to meet emission standards. At the same time, as the humidity in the exhaust gas increases, the high-temperature UV lamp tube is likely to burst, posing a fire risk and low safety. Summary of the invention

[0005] Based on this, it is necessary to overcome the defects of the prior art and provide an exhaust gas treatment system that can reduce secondary pollution and is relatively safer.

[0006] An exhaust gas treatment system, comprising:

[0007] Ozone generator;

[0008] A gas mixer, the gas mixer is connected to the ozone generator, and the gas mixer is also used to introduce waste gas and mix the waste gas with ozone output by the ozone generator;

[0009] A catalytic oxidizer, the catalytic oxidizer is connected to the gas mixer, and the catalytic oxidizer is used to perform catalytic oxidation treatment on the ozone and the exhaust gas;

[0010] An exhaust component, the exhaust component is connected to the catalytic oxidizer, and the exhaust component is used to discharge the gas after catalytic oxidation treatment by the catalytic oxidizer to the outside;

[0011] an ozone concentration detector, the ozone concentration detector being used to detect the ozone concentration in the gas treated by the catalytic oxidizer; and

[0012] A controller is electrically connected to the ozone concentration detector and the ozone generator, respectively, and is used to control and adjust the amount of ozone generated by the ozone generator according to the ozone concentration detected by the ozone concentration detector.

[0013] In one of the embodiments, the exhaust assembly includes an exhaust pipe connected to the catalytic oxidizer; the ozone concentration detector is installed on the exhaust pipe and is used to detect the ozone concentration in the gas in the exhaust pipe.

[0014] In one of the embodiments, the exhaust assembly further includes an exhaust fan installed on the exhaust pipe, and the exhaust fan is used to provide negative pressure to discharge the gas in the exhaust pipe to the outside.

[0015] In one embodiment, the exhaust assembly also includes an exhaust chimney, which is arranged in a vertical direction, and the distance between the two opposite ends of the exhaust chimney is at least 15m. The bottom end of the exhaust chimney is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the catalytic oxidizer.

[0016] In one embodiment, the gas mixer includes a mixing tube and a spoiler installed inside the mixing tube; one end of the mixing tube is used to introduce exhaust gas and is connected to the ozone generator, and the other end of the mixing tube is connected to the catalytic oxidizer.

[0017] In one embodiment, the spoiler comprises a spiral spoiler; the spoiler is one and extends from one end of the mixing tube to the other end of the mixing tube, or is provided in plurality and arranged in sequence along the axial direction of the mixing tube.

[0018] In one embodiment, a plurality of air holes are formed on the spoiler.

[0019] In one of the embodiments, a docking joint connected to the ozone generator is provided on the outer wall of one end of the mixing tube; a gas regulating valve is provided on the docking joint, the controller is electrically connected to the gas regulating valve, and the controller can control the opening of the gas regulating valve.

[0020] In one embodiment, the catalytic oxidizer includes a shell and one or more carriers located inside the shell and provided with a catalyst, the shell is provided with a gas inlet and a gas outlet, and the carrier is located in a region between the gas inlet and the gas outlet.

[0021] In one of the embodiments, the gas inlet is configured as a bell mouth with a diameter gradually increasing along the gas flow direction.

[0022] The above-mentioned waste gas treatment system passes the waste gas into the gas mixer, and outputs the ozone generated by the ozone generator to the gas mixer to mix with the waste gas. The waste gas and ozone are fully contacted to cause an oxidation reaction. The waste gas and ozone after the initial reaction then enter the catalytic oxidizer. Under the catalytic action of the catalyst in the catalytic oxidizer, a catalytic oxidation reaction occurs, which can convert the waste gas, especially the malodorous gas substances, into odorless small molecular compounds or completely mineralize them to generate water and CO2. The purified waste gas is discharged through the exhaust component to meet the standards. Among them, the ozone concentration detector can detect the ozone concentration in the gas treated by the catalytic oxidizer, and then reasonably control the amount of ozone generated by the ozone generator, reduce the equipment operation and maintenance costs, and reduce the secondary pollution of ozone to the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a structural diagram of an exhaust gas treatment system according to an embodiment of the present application.

[0024] FIG. 2 is a structural diagram of an exhaust gas treatment system according to another embodiment of the present application.

[0025] 10. Ozone generator; 20. Gas mixer; 21. Mixing tube; 211. Butt joint; 22. Spoiler; 221. Air vent; 30. Catalytic oxidizer; 31. Shell; 311. Gas inlet; 312. Gas outlet; 32. Carrier; 40. Exhaust assembly; 41. Exhaust pipe; 42. Exhaust fan; 43. Exhaust chimney; 50. Ozone concentration detector. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] Referring to FIG. 1 , FIG. 1 shows a structural diagram of an exhaust gas treatment system in an embodiment of the present application. An exhaust gas treatment system provided in an embodiment of the present application includes: an ozone generator 10, a gas mixer 20, a catalytic oxidizer 30, an exhaust assembly 40, an ozone concentration detector 50 and a controller. The gas mixer 20 is connected to the ozone generator 10, and the gas mixer 20 is also used to pass exhaust gas and mix the exhaust gas with the ozone output by the ozone generator 10. The catalytic oxidizer 30 is connected to the gas mixer 20, and the catalytic oxidizer 30 is used to catalytically oxidize the ozone and the exhaust gas. The exhaust assembly 40 is connected to the catalytic oxidizer 30, and the exhaust assembly 40 is used to discharge the gas after catalytic oxidation treatment by the catalytic oxidizer 30. The ozone concentration detector 50 is used to detect the ozone concentration in the gas treated by the catalytic oxidizer 30. The controller is electrically connected to the ozone concentration detector 50 and the ozone generator 10 , respectively. The controller is used to control and adjust the amount of ozone generated by the ozone generator 10 according to the ozone concentration detected by the ozone concentration detector 50 .

[0028] The waste gas includes but is not limited to malodorous gas.

[0029] The above-mentioned waste gas treatment system passes the waste gas into the gas mixer 20, and outputs the ozone generated by the ozone generator 10 to the gas mixer 20 to mix with the waste gas. The waste gas and ozone are fully contacted to cause an oxidation reaction. The waste gas and ozone after the preliminary reaction then enter the catalytic oxidizer 30. Under the catalytic action of the catalyst of the catalytic oxidizer 30, a catalytic oxidation reaction occurs, which can convert the waste gas, especially the malodorous gas substances, into odorless small molecular compounds or completely mineralize them to generate water and CO2. The purified waste gas is discharged through the exhaust component 40 in compliance with the standards. Among them, the ozone concentration detector 50 can detect the ozone concentration in the gas treated by the catalytic oxidizer 30, and then reasonably control the amount of ozone generated by the ozone generator 10, reduce the equipment operation and maintenance costs, and reduce the secondary pollution of ozone to the air.

[0030] Specifically, when the ozone concentration in the gas treated by the catalytic oxidizer 30 exceeds a first preset value, the amount of ozone generated by the ozone generator 10 is reduced accordingly, thereby avoiding secondary pollution caused by excessive ozone concentration; when the ozone concentration in the gas treated by the catalytic oxidizer 30 is lower than a second preset value, the amount of ozone generated by the ozone generator 10 is increased accordingly to ensure that the amount of ozone is sufficient to better oxidize the exhaust gas, thereby improving the purification quality of the exhaust gas.

[0031] In one embodiment, the exhaust assembly 40 includes an exhaust pipe 41 connected to the catalytic oxidizer 30. The ozone concentration detector 50 is installed on the exhaust pipe 41 and is used to detect the ozone concentration in the gas in the exhaust pipe 41. In this way, the gas treated by the catalytic oxidizer 30 is discharged into the exhaust pipe 41, and the ozone concentration in the gas in the exhaust pipe 41 is detected by the sampling concentration detector. When the ozone concentration meets the requirements, the gas in the exhaust pipe 41 is directly discharged to the outside; when the ozone concentration does not meet the requirements, the controller controls the ozone generator 10 to act accordingly and adaptively adjusts the amount of ozone.

[0032] In one embodiment, the exhaust assembly 40 further includes an exhaust fan 42 installed on the exhaust pipe 41. The exhaust fan 42 is used to provide negative pressure to discharge the gas in the exhaust pipe 41 to the outside. In this way, under the suction force of the exhaust fan 42, the exhaust gas and ozone can enter the gas mixer 20 for mixing, and then enter the catalytic oxidizer 30 for catalytic oxidation treatment, and then be discharged to the outside through the exhaust pipe 41, which can greatly improve the treatment efficiency of the exhaust gas.

[0033] Please refer to FIG. 1 . In one embodiment, the exhaust assembly 40 further includes an exhaust pipe 43. The exhaust pipe 43 is arranged in the vertical direction and the distance between the two opposite ends is at least 15 m, so that the top of the exhaust pipe 43 is greater than 15 m above the ground. The bottom end of the exhaust pipe 43 is connected to one end of the exhaust pipe 41, and the other end of the exhaust pipe 41 is connected to the catalytic oxidizer 30. In this way, the height of the purified exhaust gas after passing through the exhaust pipe 43 and meeting the emission standards is at least 15 m above the ground, so that the gas emission of the exhaust gas treatment system can meet the environmental protection requirements.

[0034] Please refer to FIG. 2 . In one embodiment, the gas mixer 20 includes a mixing tube 21 and a spoiler 22 installed inside the mixing tube 21. In addition, one end of the mixing tube 21 is used to pass the exhaust gas and is connected to the ozone generator 10, and the other end of the mixing tube 21 is connected to the catalytic oxidizer 30. In this way, the exhaust gas and ozone can be mixed with each other after passing from one end of the mixing tube 21 into the inside of the mixing tube 21. Since there is also a spoiler 22 for disturbing the ozone and the exhaust gas inside the mixing tube 21, the spoiler 22 can change the flow direction of the mixed gas during the process of the exhaust gas and ozone flowing to the other end of the mixing tube 21, and turbulence occurs, thereby improving the mixing efficiency and oxidation efficiency.

[0035] Referring to Fig. 2, in one embodiment, the spoiler 22 includes a spiral spoiler. There is one spoiler extending from one end of the mixing tube 21 to the other end of the mixing tube 21, or there are multiple spoilers arranged in sequence along the axial direction of the mixing tube 21. In this way, when ozone and exhaust gas enter the interior of the mixing tube 21 from one end of the mixing tube 21, the spoiler 22 can make the mixed gas flow in a spiral shape, thereby improving the mixing efficiency and oxidation efficiency.

[0036] Referring to Fig. 2, in one embodiment, a plurality of air holes 221 are formed on the spoiler, so that the gas inside the mixing tube 21 can be turbulent, and the mixing efficiency and oxidation efficiency can be improved.

[0037] The apertures of the air holes 221 may be the same or different, which is not limited here. In addition, the shapes of the air holes 221 may be regular shapes such as circular, elliptical, polygonal, and other irregular shapes, which are not limited here.

[0038] In one embodiment, a butt joint 211 connected to the ozone generator 10 is provided on the outer wall of one end of the mixing tube 21. Specifically, a gas regulating valve is provided on the butt joint 211, and the controller is electrically connected to the gas regulating valve, and the controller can control the opening of the gas regulating valve.

[0039] The catalytic oxidizer 30 in this embodiment integrates capture, adsorption, catalysis and decomposition and uses a special process to embed special catalytic components, so that the malodorous gas substances are converted into odorless small molecular compounds or completely mineralized to generate water and CO2. The malodorous gas treatment efficiency is greater than 95%, and there is no secondary pollution, which reduces the equipment's later maintenance and operation costs and reduces the equipment operation risks.

[0040] Please refer to FIG. 2 . In one embodiment, the catalytic oxidizer 30 includes a housing 31 and one or more carriers 32 disposed inside the housing 31 and provided with a catalyst. The housing 31 is provided with a gas inlet 311 and a gas outlet 312, and the carrier 32 is disposed in the region between the gas inlet 311 and the gas outlet 312. Thus, after ozone and exhaust gas flow in from the gas inlet 311 and pass through the carrier 32, under the catalytic oxidation action of the catalyst, ozone can be converted into hydroxyl radicals, thereby improving the oxidation reaction efficiency.

[0041] In some embodiments, the catalyst includes but is not limited to an aluminum-based catalyst, a platinum-based catalyst or a carbon-based catalyst, etc., which can be flexibly adjusted and set according to actual needs.

[0042] Please refer to Figure 2. In one embodiment, the gas inlet 311 is configured as a bell mouth with a gradually increasing diameter along the airflow direction. In this way, since the gas inlet 311 is configured as a bell mouth, the mixed gas can be distributed more evenly, the contact area between the mixed gas and the catalyst is increased, the catalytic oxidation reaction time is guaranteed, and the odor treatment efficiency is improved.

[0043] It should be noted that the "butt joint 211" in this embodiment can be "a part of the mixing tube 21", that is, the "butt joint 211" and the "other parts of the mixing tube 21" are manufactured as one piece; it can also be an independent component separable from the "other parts of the mixing tube 21", that is, the "butt joint 211" can be manufactured independently and then combined with the "other parts of the mixing tube 21" into a whole.

[0044] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An exhaust gas treatment system, characterized in that: The exhaust gas treatment system comprises: Ozone generator; A gas mixer, the gas mixer is connected to the ozone generator, and the gas mixer is also used to introduce waste gas and mix the waste gas with ozone output by the ozone generator; A catalytic oxidizer, the catalytic oxidizer is connected to the gas mixer, and the catalytic oxidizer is used to perform catalytic oxidation treatment on the ozone and the exhaust gas; An exhaust component, the exhaust component is connected to the catalytic oxidizer, and the exhaust component is used to discharge the gas after catalytic oxidation treatment by the catalytic oxidizer to the outside; an ozone concentration detector, the ozone concentration detector being used to detect the ozone concentration in the gas treated by the catalytic oxidizer; and A controller is electrically connected to the ozone concentration detector and the ozone generator, respectively, and is used to control and adjust the amount of ozone generated by the ozone generator according to the ozone concentration detected by the ozone concentration detector.

2. The exhaust gas treatment system according to claim 1, characterized in that: The exhaust component comprises an exhaust pipe connected to the catalytic oxidizer; the ozone concentration detector is installed on the exhaust pipe and is used to detect the ozone concentration in the gas in the exhaust pipe.

3. The exhaust gas treatment system according to claim 2, characterized in that: The exhaust assembly also includes an exhaust fan installed on the exhaust pipe, and the exhaust fan is used to provide negative pressure to discharge the gas in the exhaust pipe to the outside.

4. The exhaust gas treatment system according to claim 3, characterized in that: The exhaust assembly also includes an exhaust chimney, which is arranged in a vertical direction, and the distance between the two opposite ends of the exhaust chimney is at least 15m. The bottom end of the exhaust chimney is connected to one end of the exhaust pipe, and the other end of the exhaust pipe is connected to the catalytic oxidizer.

5. The exhaust gas treatment system according to claim 1, characterized in that: The gas mixer comprises a mixing tube and a spoiler installed inside the mixing tube; one end of the mixing tube is used for introducing exhaust gas and is connected to the ozone generator, and the other end of the mixing tube is connected to the catalytic oxidizer.

6. The exhaust gas treatment system according to claim 5, characterized in that: The spoiler comprises a spiral spoiler; the spoiler is in one piece and extends from one end of the mixing tube to the other end of the mixing tube, or is in multiple pieces and arranged in sequence along the axial direction of the mixing tube.

7. The exhaust gas treatment system according to claim 6, characterized in that: A plurality of air holes are formed on the spoiler.

8. The exhaust gas treatment system according to claim 5, characterized in that: A butt joint connected to the ozone generator is provided on the outer wall of one end of the mixing tube; a gas regulating valve is provided on the butt joint, the controller is electrically connected to the gas regulating valve, and the controller can control the opening of the gas regulating valve.

9. The exhaust gas treatment system according to claim 1, characterized in that: The catalytic oxidizer comprises a shell and one or more carriers located inside the shell and provided with a catalyst. The shell is provided with a gas inlet and a gas outlet, and the carrier is located in a region between the gas inlet and the gas outlet.

10. The exhaust gas treatment system according to claim 9, characterized in that: The gas inlet is arranged in the form of a bell mouth with a diameter gradually increasing along the gas flow direction.

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