An organic waste gas treatment system

Abstract

The application discloses an organic waste gas treatment system and belongs to the field of waste gas treatment. The treatment system comprises a heat storage chamber, a medium inlet and a waste gas outlet arranged at the top of the heat storage chamber, a medium outlet and a waste gas inlet arranged at the bottom of the heat storage chamber, and a circulating power device. Organic waste gas enters the heat storage chamber through the waste gas inlet and is subjected to oxidation reaction under the heating action of the heat storage medium, and the reacted gas is discharged through the waste gas outlet. The circulating power device is communicated with the medium inlet and the medium outlet of the heat storage chamber through a circulating pipeline and is used for conveying the heat storage medium discharged from the medium outlet of the heat storage chamber into the heat storage chamber through the medium inlet. A flow guide structure is arranged in the middle region of the heat storage chamber, and the flow guide structure forms a reaction cavity without filling the heat storage medium in a part of the region in the heat storage chamber. The application solves the problem that the existing waste gas treatment system is not reasonable and is not conducive to oxidation reaction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of organic waste gas treatment, in particular to an organic waste gas treatment system and method. BACKGROUND

[0002] The oxidation method is a common method for treating waste gas containing organic solvents. The oxidation method includes regenerative oxidation and catalytic combustion. The principle of regenerative oxidation is to heat the organic waste gas to above 760 degrees Celsius, so that the VOC in the waste gas is oxidized and decomposed into carbon dioxide and water. The high-temperature gas generated by oxidation flows through specially designed ceramic heat storage bodies, causing the ceramic bodies to heat and store heat, which is used to preheat subsequent organic waste gas entering. Thus, the fuel consumption for heating the waste gas is saved.

[0003] Currently, fixed bed regenerative oxidation reactors are commonly used for organic waste gas treatment. In the fixed bed regenerative oxidation reactor, the relative position of the heat storage carrier in the heat storage chamber is fixed, and the waste gas is oxidized and decomposed by heat exchange with the heat storage carrier after entering the heat storage chamber. However, because the relative position of the heat storage carrier is fixed, the heat storage carrier at the inlet of the heat storage chamber is always in contact with the organic waste gas at a relatively low temperature, causing the temperature to gradually decrease. The temperature field of the heat storage carrier is always changing, causing the temperature of the purified gas at the outlet of the heat storage chamber to also always change and be unable to be stably controlled and utilized. Therefore, multiple heat storage chambers are usually required to ensure normal oxidation reaction. The system structure is complex and controllability is poor. In a moving bed regenerative oxidation reactor, the temperature field remains constant because the heat storage carrier reciprocates. However, the moving bed regenerative oxidation reactor is filled with heat storage carriers, making it difficult to form a stable reaction space, which is very unfavorable for the oxidation reaction. SUMMARY

[0004] The present application aims to solve the problem of unreasonable structure of the existing organic waste gas treatment system which is not conducive to oxidation reaction.

[0005] In view of the above technical problems, the present application provides the following technical solutions:

[0006] An organic waste gas treatment system comprises a heat storage chamber, which is filled with heat storage medium. The top of the heat storage chamber is provided with a medium inlet and a waste gas outlet. The bottom of the heat storage chamber is provided with a medium outlet and a waste gas inlet. Organic waste gas enters the heat storage chamber through the waste gas inlet and undergoes oxidation reaction under the heating action of the heat storage medium. The reacted gas is discharged through the waste gas outlet. A circulating power device is connected to the medium inlet and the medium outlet of the heat storage chamber through a circulating pipeline, and is used to transport the heat storage medium discharged from the medium outlet of the heat storage chamber to the heat storage chamber through the medium inlet. The middle region of the heat storage chamber is provided with a flow guide structure, which forms a reaction cavity without heat storage medium in a part of the heat storage chamber.

[0007] In some embodiments of the present application, the flow guide structure comprises a flow guide plate, and an extension direction of at least a partial region of the flow guide plate is obliquely intersected with a vertical direction.

[0008] In some embodiments of the present application, the heat storage chamber comprises a first sub-chamber in which the flow guide structure is arranged, and a second sub-chamber and a third sub-chamber arranged on the upper and lower sides of the first sub-chamber respectively; the second sub-chamber and the third sub-chamber have the same cross-sectional area, and the cross-sectional area of the first sub-chamber is greater than that of the second sub-chamber or the third sub-chamber.

[0009] In some embodiments of the present application, the flow guide plate comprises a tapered portion, and a region between the tapered portion of the flow guide plate and the first sub-chamber forms a medium channel, and an inner region of the tapered portion of the flow guide plate forms the reaction cavity.

[0010] In some embodiments of the present application, the first sub-chamber comprises a tapered wall, and the tapered wall of the first sub-chamber is arranged in parallel with the tapered portion of the flow guide plate.

[0011] In some embodiments of the present application, the flow guide plate further comprises a cylindrical portion, and the cylindrical portion of the flow guide plate is located on the lower side of the tapered portion, and an opening on the lower side of the cylindrical portion of the flow guide plate is arranged in opposite spacing with the upper end of the third sub-chamber.

[0012] In some embodiments of the present application, the first sub-chamber further comprises a cylindrical wall and an inverted tapered wall, the cylindrical wall is located on the lower side of the tapered wall, and the inverted tapered wall is located on the lower side of the cylindrical wall, the tapered wall is connected to the second sub-chamber, and the inverted tapered wall is connected to the third sub-chamber.

[0013] In some embodiments of the present application, the cross-sectional area of the medium channel in the first sub-chamber is substantially equal to that of the medium channel in the second sub-chamber or the third sub-chamber.

[0014] In some embodiments of the present application, the flow guide plate comprises an inverted tapered portion, an upper end of the inverted tapered portion is connected to an inner wall of the first sub-chamber, and a lower end of the inverted tapered portion has a gap with the inner wall of the first sub-chamber, a region between the flow guide plate and the first sub-chamber forms the reaction cavity, and an inner region of the flow guide plate forms the medium channel.

[0015] In some embodiments of the present application, the processing system further comprises a heating device in communication with the third sub-chamber of the heat storage chamber.

[0016] The technical solution of the present application has the following technical effects compared with the prior art:

[0017] The organic waste gas treatment system provided by the application realizes the oxidation reaction of organic gas by adopting the moving bed type heat accumulating oxidation reactor, and the temperature field is not easy to change; meanwhile, the flow guide structure is arranged in the heat accumulating chamber, the reaction space suitable for the oxidation reaction of organic gas is formed, the oxidation reaction of organic gas is sufficient, and the waste gas treatment effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0018] The preferred embodiments of the application will be described in detail below with the help of the accompanying drawings, which will help to understand the purposes and advantages of the application, wherein:

[0019] Figure 1 The system structure diagram of a specific embodiment of the organic waste gas treatment system of the application;

[0020] Figure 2 The sectional view of embodiment 1 of the heat accumulating chamber of the organic waste gas treatment system of the application;

[0021] Figure 3 The top view of embodiment 1 of the heat accumulating chamber of the organic waste gas treatment system of the application;

[0022] Figure 4 The sectional view of embodiment 2 of the heat accumulating chamber of the organic waste gas treatment system of the application. DETAILED DESCRIPTION

[0023] The technical solutions of the application will be described clearly and completely below with the help of the accompanying drawings, obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the application.

[0024] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0027] As Figure 1 The specific embodiment of the organic waste gas treatment system (hereinafter referred to as treatment system) provided by the present application is shown, which is used for treating organic waste gas by using regenerative oxidation method. The treatment system comprises a regenerative chamber 10 and a circulating power device 30 which is communicated with the medium inlet 10a1 and the medium outlet 10a2 of the regenerative chamber 10 through a circulating pipeline 20. Wherein, the regenerative chamber 10 is filled with regenerative medium, the top of the regenerative chamber 10 is provided with the medium inlet 10a1 and the waste gas outlet 10b2, the bottom of the regenerative chamber 10 is provided with the medium outlet 10a2 and the waste gas inlet 10b1, the organic waste gas enters the regenerative chamber 10 along the waste gas inlet 10b1 and is subjected to oxidation reaction under the heating action of the regenerative medium, and the reacted gas is discharged along the waste gas outlet 10b2; the regenerative medium is transported into the regenerative chamber 10 along the medium inlet 10a1 under the action of the circulating power device 30, and is discharged from the medium outlet 10a2 of the regenerative chamber 10 to the circulating pipeline 20 to continue to be transported to the medium inlet 10a1 on the upper side of the regenerative chamber 10 to realize the circulating heat storage; wherein, the middle region of the regenerative chamber 10 is provided with a flow guide structure 40, the flow guide structure 40 forms a reaction cavity S which is not filled with regenerative medium in a part of the regenerative chamber 10, so as to make the organic gas to be subjected to oxidation reaction, and the other region forms a medium passage T which is filled with regenerative medium, so as to keep the temperature of the regenerative chamber 10 in the temperature range which can realize oxidation.

[0028] The above treatment system realizes the oxidation reaction of organic gas by using a moving bed type regenerative oxidation reactor, the temperature field of which is not easy to change, at the same time, the flow guide structure 40 is used to form a space suitable for the oxidation reaction of organic gas, which can make the oxidation reaction of organic gas sufficient, and the waste gas treatment effect is good.

[0029] Specifically, in an optional embodiment, the flow guide structure 40 comprises a flow guide plate 41, at least a partial region of which extends obliquely to the vertical direction. Since the heat storage medium flows downward in the heat storage chamber 10 under the action of gravity, by arranging the flow guide plate 41 obliquely to the vertical direction in the heat storage chamber 10, the lower or upper part of the oblique plate surface can form a space that cannot be reached by the heat storage medium, i.e., a reaction cavity S.

[0030] Specifically, in an optional embodiment, the heat storage chamber 10 comprises a first sub-chamber 11 and second and third sub-chambers 12 and 13 arranged on the upper and lower sides of the first sub-chamber 11 respectively; the flow guide structure 40 is arranged inside the first sub-chamber 11, the second and third sub-chambers 12 and 13 have the same cross-sectional area, the cross-sectional area of the first sub-chamber 11 is greater than that of the second or third sub-chamber 12 or 13, and the cross-sectional area of the medium passage T in the first sub-chamber 11 is the same as that of the second and third sub-chambers 12 and 13. This can make the cross-sectional area of the medium passage T in each region of the heat storage chamber 10 consistent, so as to ensure the stability of the flow speed of the heat storage medium and the constancy of the temperature field, and facilitate the oxidation reaction of the organic gas.

[0031] Specifically, the second and third sub-chambers 12 and 13 extend in the vertical direction and have the same extension length, so that the first sub-chamber 11 is located at the 1 / 2 of the reaction region of the heat storage chamber 10, facilitating temperature control.

[0032] The processing system further comprises a heating device 50 in communication with the third sub-chamber 13 of the heat storage chamber 10. The heating device 50 preheats the heat storage medium in the heat storage chamber 10 at the initial start of the system to provide the initial reaction heat of the organic gas. Specifically, the heating device 50 is a heating furnace which preheats the heat storage medium by blowing hot air or nitrogen into the heat storage chamber 10. When the processing system is started for more than a set time or the temperature in the heat storage chamber 10 exceeds a set temperature, the heating device 50 can be turned off.

[0033] The processing system further comprises a flow control device 60 arranged on the circulating pipeline 20. The flow control device 60 controls the flow of the heat storage medium on the circulating pipeline 20, so that the heat storage medium in the region of the first sub-chamber 11 in the heat storage chamber 10 reaches a temperature range suitable for the oxidation reaction, realizing the oxidation reaction of the organic gas.

[0034] Specifically, in an optional embodiment, the processing system further comprises a dust removal device 70 arranged at the top of the heat storage chamber 10. The dust in the dust-containing organic gas is discharged after passing through the dust removal device 70.

[0035] Specifically, the structure of the guide plate 41 and its cooperation with the heat storage chamber 10 are not unique; in one embodiment, such as Figures 2-3 As shown, the guide plate 41 includes a conical portion 411, meaning at least a portion of the guide plate 41 is a conical plate, such as a circular conical plate or a square conical plate. The region between the conical portion 411 of the guide plate 41 and the first compartment 11 forms a medium channel T suitable for the flow of the heat storage medium, and the inner region of the conical portion 411 of the guide plate 41 forms the reaction cavity S. The conical plate facilitates the flow of the heat storage medium and has minimal impact on the flow velocity of the heat storage medium. The guide plate 41 also includes a cylindrical portion 412 located below the conical portion 411, and the lower opening of the cylindrical portion 412 of the guide plate 41 is spaced apart from the upper end of the third compartment 13.

[0036] Corresponding to the conical portion 411 of the guide plate 41, the first compartment 11 includes a conical wall 111. The conical wall 111 of the first compartment 11 is arranged parallel to the conical portion 411 of the guide plate 41 to guide the flow direction of the heat storage medium and avoid turbulence. The first compartment 11 also includes a cylindrical wall 112 and an inverted conical wall 113 located sequentially below the conical wall 111. That is, the cylindrical wall 112 is located below the conical wall 111, and the inverted conical wall 113 is located below the cylindrical wall 112. The conical wall 111 connects to the second compartment 12, and the inverted conical wall 113 connects to the third compartment 13. Through the above-mentioned structural arrangement of the first compartment 11 and its cooperation with the guide plate 41, the medium channel T flows smoothly, and the cross-sectional area of ​​the medium channel T in each region of the first compartment 11 changes little, resulting in good consistency of flow velocity. More specifically, the cross-sectional area of ​​the medium channel T formed between the inner wall of the first compartment 11 and the guide plate 41 is approximately equal to the cross-sectional area of ​​the medium channel T in the second compartment 12 or the third compartment 13, so as to ensure better consistency of the heat storage medium flow in each region of the heat storage chamber 10.

[0037] To further ensure the flow velocity of the heat storage carrier, the cone angle of the guide plate 41 is between 45° and 75°. At the same time, the maximum diameter of the reaction cavity S is 2 to 4 times the cross-sectional area of ​​the medium channel T to ensure a full oxidation reaction.

[0038] The flow guide plate 41 is connected to the first compartment 11 by at least one set of finned plates 413, for example, by four sets of finned plates 413. One end of the finned plate 413 is fixedly connected to the outer wall of the flow guide plate 41, and the other end of the finned plate 413 is fixedly connected to the inner wall of the first compartment 11.

[0039] like Figure 4Another structure of the flow guide plate 41 and the regenerator 10 cooperating with the flow guide plate 41 are shown. In this embodiment, the flow guide plate 41 comprises an inverted conical portion 414, the upper end of which is connected to the inner wall of the first sub-chamber 11, and the lower end of which has a gap with the inner wall of the first sub-chamber 11. The area between the flow guide plate 41 and the first sub-chamber 11 forms the reaction cavity S, and the inner area of the flow guide plate 41 forms the medium passage T.

[0040] The flow guide plate 41 further comprises a cylindrical portion 415 located at the lower side of the inverted conical portion 414, the lower side of the cylindrical portion 415 is oppositely arranged with the upper end of the third sub-chamber 13, and the cross section of the cylindrical portion 415 is consistent with the cross section of the third sub-chamber 13.

[0041] The regenerator 10 comprises a conical wall 111, a cylindrical wall 112 and an inverted conical wall 113 from top to bottom. The upper end of the flow guide plate 41 is connected to the transition area between the conical wall 111 and the cylindrical wall 112 of the regenerator 10, and the lower end of the flow guide plate 41 extends to the inner area of the inverted conical wall 113 of the regenerator 10.

[0042] Obviously, the above-mentioned embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to enumerate all the embodiments. The changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An organic waste gas treatment system, characterized in that, include: A heat storage chamber is filled with a heat storage medium. The top of the heat storage chamber is provided with a medium inlet and a waste gas outlet, and the bottom of the heat storage chamber is provided with a medium outlet and a waste gas inlet. Organic waste gas enters the heat storage chamber through the waste gas inlet and undergoes an oxidation reaction under the heating effect of the heat storage medium. The gas after the reaction is discharged through the waste gas outlet. The circulating power unit is connected to the medium inlet and medium outlet of the heat storage chamber through a circulating pipeline, and is used to transport the heat storage medium discharged from the medium outlet of the heat storage chamber into the heat storage chamber along the medium inlet. The heat storage chamber includes a first compartment and a second and a third compartment respectively located on the upper and lower sides of the first compartment. A flow guiding structure is provided in the first compartment. The flow guiding structure is located in the middle region of the heat storage chamber. The flow guiding structure forms a reaction cavity in a part of the heat storage chamber that is not filled with heat storage medium. The flow guiding structure includes a flow guiding plate, which includes a conical portion and a cylindrical portion. The area between the flow guiding plate and the inner wall of the first compartment forms a medium channel. The cylindrical portion of the flow guiding plate is located below the conical portion, and the lower opening of the cylindrical portion of the flow guiding plate is spaced apart from the upper end of the third compartment.

2. The organic waste gas treatment system according to claim 1, characterized in that, The second compartment and the third compartment have the same cross-sectional area, and the cross-sectional area of ​​the first compartment is greater than that of the second compartment or the third compartment.

3. The organic waste gas treatment system according to claim 2, characterized in that, The reaction cavity is formed on the inner side of the conical portion of the guide plate.

4. The organic waste gas treatment system according to claim 3, characterized in that, The first compartment includes a conical wall, which is arranged parallel to the conical portion of the guide plate.

5. The organic waste gas treatment system according to claim 4, characterized in that, The first compartment further includes a cylindrical wall and an inverted conical wall, the cylindrical wall being located below the conical wall, the inverted conical wall being located below the cylindrical wall, the conical wall connecting to the second compartment, and the inverted conical wall connecting to the third compartment.

6. The organic waste gas treatment system according to claim 5, characterized in that, The cross-sectional area of ​​the medium channel in the first compartment is approximately equal to the cross-sectional area of ​​the medium channel in the second or third compartment.

7. An organic waste gas treatment system according to claim 2, characterized in that, The guide plate includes an inverted conical portion, the upper end of which is connected to the inner wall of the first compartment, and the lower end of which has a gap with the inner wall of the first compartment. The area between the guide plate and the first compartment forms the reaction cavity, and the inner area of ​​the guide plate forms the medium channel.

8. An organic waste gas treatment system according to claim 2, characterized in that, The processing system also includes a heating device connected to a third compartment of the heat storage chamber.

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