Organic waste gas treatment system

Abstract

The invention discloses an organic waste gas treatment system, and belongs to the field of waste gas treatment. The treatment system comprises a heat storage chamber, the heat storage chamber is filled with a heat storage medium, a medium inlet and a waste gas outlet are formed in the top of the heat storage chamber, a medium outlet and a waste gas inlet are formed in the bottom of the heat storage chamber, organic waste gas enters the heat storage chamber along the waste gas inlet and is subjected to an oxidation reaction under the heating action of the heat storage medium, and the organic waste gas enters the heat storage chamber; the reacted gas is discharged along 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 along the medium inlet; wherein a flow guide structure is arranged in the middle area of the heat storage chamber, and the flow guide structure enables a part of the area in the heat storage chamber to form a reaction cavity which is not filled with a heat storage medium. The problem that an existing waste gas treatment system is unreasonable in structure and not beneficial to oxidation reaction is solved.

Description

Technical Field

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

[0002] Oxidation is a common method for treating waste gas containing organic solvents. Oxidation methods include thermal storage oxidation and catalytic combustion. The principle of thermal storage oxidation is to heat the organic waste gas to above 760 degrees Celsius to oxidize and decompose the VOC in the waste gas into carbon dioxide and water. The high-temperature gas generated by oxidation flows through a special ceramic thermal storage body, which heats up the ceramic body and stores heat. This heat storage is used to preheat the subsequent organic waste gas. This saves fuel consumption for heating the waste gas.

[0003] At present, fixed-bed thermal storage oxidation reactors are usually used for organic waste gas treatment. Fixed-bed thermal storage oxidation reactors, that is, the relative position of the heat storage carrier in the heat storage chamber remains unchanged. After the waste gas enters the heat storage chamber, it is oxidized and decomposed by heat exchange with the heat storage carrier. However, since the relative position of the heat storage carrier remains unchanged, the heat storage carrier at the entrance of the heat storage chamber is always in contact with the organic waste gas with a lower temperature, causing the temperature to gradually drop. The temperature field of the heat storage carrier has been changing, causing the temperature of the purified gas at the outlet of the heat storage chamber to also change and cannot be stably controlled and utilized. For this reason, it is usually necessary to set up multiple heat storage chambers to ensure normal oxidation reactions. The system structure is complex and the controllability is poor. The moving bed thermal storage oxidation reactor can keep the temperature field constant due to the reciprocating circulation of the heat storage carrier, but the moving bed thermal storage oxidation reactor is filled with heat storage carriers, and it is difficult to form a stable reaction space, which is very unfavorable for the oxidation reaction. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing organic waste gas treatment system has an unreasonable structure which is not conducive to oxidation reaction.

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

[0006] An organic waste gas treatment system comprises: a heat storage chamber, wherein the heat storage chamber is filled with a heat storage medium, a medium inlet and a waste gas outlet are arranged at the top of the heat storage chamber, and a medium outlet and a waste gas inlet are arranged at the bottom of the heat storage chamber, the organic waste gas enters the heat storage chamber along the waste gas inlet, and undergoes an oxidation reaction under the heating action of the heat storage medium, and the gas after the reaction is discharged along the waste gas outlet; a circulating power device, which is connected 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 along the medium inlet; wherein a guide structure is arranged in the middle area of ​​the heat storage chamber, and the guide structure forms a reaction cavity that is not filled with the heat storage medium in a part of the area in the heat storage chamber.

[0007] In some embodiments of the present invention, the guide structure includes a guide plate, and an extension direction of at least a portion of the guide plate is obliquely intersecting with a vertical direction.

[0008] In some embodiments of the present invention, the heat storage chamber includes a first subchamber in which the guide structure is arranged, and a second subchamber and a third subchamber respectively arranged on the upper and lower sides of the first subchamber; the cross-sectional area of ​​the second subchamber is consistent with that of the third subchamber, and the cross-sectional area of ​​the first subchamber is greater than the cross-sectional area of ​​the second subchamber or the third subchamber.

[0009] In some embodiments of the present invention, the guide plate includes a tapered portion, the area between the tapered portion of the guide plate and the first chamber forms a medium channel, and the inner area of ​​the tapered portion of the guide plate forms the reaction cavity.

[0010] In some embodiments of the present invention, the first chamber includes a tapered wall, and the tapered wall of the first chamber is arranged parallel to the tapered portion of the guide plate.

[0011] In some embodiments of the present invention, the guide plate further includes a cylindrical portion, the cylindrical portion of the guide plate is located below the conical portion, and the lower opening of the cylindrical portion of the guide plate is spaced relative to the upper end of the third chamber.

[0012] In some embodiments of the present invention, the first chamber further comprises a cylindrical wall and an inverted conical wall, the cylindrical wall is located at the lower side of the conical wall, the inverted conical wall is located at the lower side of the cylindrical wall, the conical wall is connected to the second chamber, and the inverted conical wall is connected to the third chamber.

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

[0014] In some embodiments of the present invention, the guide plate includes an inverted conical portion, the upper end of the inverted conical portion is connected to the inner wall of the first chamber, and the lower end of the inverted conical portion has a gap with the inner wall of the first chamber, the area between the guide plate and the first chamber forms the reaction cavity, and the inner area of ​​the guide plate forms the medium channel.

[0015] In some embodiments of the present invention, the processing system further includes a heating device connected to the third sub-chamber of the heat storage chamber.

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

[0017] In the organic waste gas treatment system provided by the present invention, the oxidation reaction of the organic gas is realized by adopting a moving bed type thermal storage oxidation reactor, and its temperature field is not easy to change; at the same time, a guide structure is arranged in the thermal storage chamber to form a reaction space suitable for the oxidation reaction of the organic gas, so that the oxidation reaction of the organic gas is sufficient and the waste gas treatment effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 A system configuration diagram of a specific embodiment of the organic waste gas treatment system of the present invention;

[0020] Figure 2 A cross-sectional view of Embodiment 1 of the heat storage chamber of the organic waste gas treatment system of the present invention;

[0021] Figure 3 A top view of Embodiment 1 of the heat storage chamber of the organic waste gas treatment system of the present invention;

[0022] Figure 4 It is a cross-sectional view of Example 2 of the heat storage chamber of the organic waste gas treatment system of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1 The figure shows a specific embodiment of the organic waste gas treatment system (hereinafter referred to as the treatment system) provided by the present invention, and the treatment system is used to treat organic waste gas by adopting a thermal storage oxidation method. The treatment system includes: a heat storage chamber 10 and a circulation power device 30 connected to the medium inlet 10a1 and the medium outlet 10a2 of the heat storage chamber 10 through a circulation pipeline 20. The heat storage chamber 10 is filled with a heat storage medium, and a medium inlet 10a1 and a waste gas outlet 10b2 are arranged at the top of the heat storage chamber 10, and a medium outlet 10a2 and a waste gas inlet 10b1 are arranged at the bottom of the heat storage chamber 10. The organic waste gas enters the heat storage chamber 10 along the waste gas inlet 10b1, and undergoes an oxidation reaction under the heating action of the heat storage medium, and the gas after the reaction is discharged along the waste gas outlet 10b2; the heat storage medium is transported to the heat storage chamber 10 along the medium inlet 10a1 under the action of the circulation power device 30, The organic gas is discharged from the medium outlet 10a2 of the heat storage chamber 10 into the circulation pipeline 20 and is further transported to the medium inlet 10a1 on the upper side of the heat storage chamber 10 to realize cyclic heat storage; wherein, a flow guide structure 40 is arranged in the middle area of ​​the heat storage chamber 10, and the flow guide structure 40 forms a reaction cavity S which is not filled with the heat storage medium in a part of the area in the heat storage chamber 10 so that the organic gas can undergo an oxidation reaction, while the other areas form a medium channel T filled with the heat storage medium so that the temperature of the heat storage chamber 10 is always maintained within a temperature range capable of achieving oxidation.

[0028] The above-mentioned treatment system adopts a moving bed thermal storage oxidation reactor to realize the oxidation reaction of organic gas, and its temperature field is not easy to change. At the same time, a 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 better.

[0029] Specifically, in an optional embodiment, the guide structure 40 includes a guide plate 41, and the extension direction of at least a part of the guide plate 41 is obliquely intersected with the vertical direction. Since the heat storage medium flows from top to bottom along the heat storage chamber 10 under the action of its own gravity, by arranging the guide plate 41 with a part of the area inclined relative to the vertical direction in the heat storage chamber 10, it can form a space that cannot be reached by the heat storage medium at the lower part or the upper part of the inclined plate surface, that is, the reaction cavity S.

[0030] Specifically, in an optional embodiment, the heat storage chamber 10 includes a first chamber 11 and a second chamber 12 and a third chamber 13 respectively arranged on the upper and lower sides of the first chamber 11; wherein the guide structure 40 is arranged inside the first chamber 11, the cross-sectional area of ​​the second chamber 12 is consistent with that of the third chamber 13, the cross-sectional area of ​​the first chamber 11 is larger than the cross-sectional area of ​​the second chamber 12 or the third chamber 13, and the cross-sectional area of ​​the medium channel T in the first chamber 11 is consistent with the cross-sectional area of ​​the second chamber 12 and the third chamber 13; it can make the cross-sectional size of the medium channel T in each area of ​​the heat storage chamber 10 consistent, so as to ensure the stability of the flow velocity of the heat storage medium, ensure the constant temperature field, and facilitate the oxidation reaction of the organic gas.

[0031] Specifically, the second subchamber 12 and the third subchamber 13 are extended in the vertical direction and have the same extension length, so that the first subchamber 11 is located at 1 / 2 of the reaction zone of the entire heat storage chamber 10, which is convenient for temperature control.

[0032] The treatment system further includes a heating device 50 connected to the third subchamber 13 of the regenerator 10. The heating device 50 preheats the heat storage medium in the regenerator 10 when the system is initially started to provide the initial organic gas reaction heat. Specifically, the heating device 50 is a heating furnace, which preheats the heat storage medium by blowing hot air or nitrogen into the regenerator 10. When the treatment system is started for more than a set time or the temperature in the regenerator 10 exceeds a set temperature, the heating device 50 can be turned off.

[0033] The treatment system also includes a flow control device 60 disposed on the circulation pipeline 20, and the flow control device 60 controls the flow of the heat storage medium on the circulation pipeline 20 so that the heat storage medium reaches a temperature range suitable for the oxidation reaction in the area where the first subchamber 11 in the heat storage chamber 10 is located, thereby realizing the oxidation reaction of the organic gas.

[0034] Specifically, in an optional implementation, the treatment system further includes a dust removal device 70 disposed on the top of the heat storage chamber 10 , and 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 the matching relationship with the heat storage chamber 10 are not unique; in one embodiment, as Figure 2-Figure 3 As shown, the guide plate 41 includes a conical portion 411, that is, 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 area between the conical portion 411 of the guide plate 41 and the first chamber 11 forms a medium channel T suitable for the flow of the heat storage medium, and the inner area of ​​the conical portion 411 of the guide plate 41 forms the reaction cavity S. The conical plate is provided to facilitate the flow of the heat storage medium, and has little effect on the flow velocity of the heat storage medium. The guide plate 41 also includes a cylindrical portion 412 located at the lower side of the conical portion 411, and the lower side opening of the cylindrical portion 412 of the guide plate 41 is arranged relative to the upper end of the third chamber 13.

[0036] Corresponding to the conical part 411 of the guide plate 41, the first chamber 11 includes a conical wall 111, and the conical wall 111 of the first chamber 11 is arranged in parallel with the conical part 411 of the guide plate 41, so as to guide the flow direction of the heat storage medium and avoid the formation of turbulence. The first chamber 11 also includes a cylindrical wall 112 and an inverted conical wall 113 located at the lower side of the conical wall 111, that is, the cylindrical wall 112 is located at the lower side of the conical wall 111, and the inverted conical wall 113 is located at the lower side of the cylindrical wall 112, the conical wall 111 is connected to the second chamber 12, and the inverted conical wall 113 is connected to the third chamber 13; through the above-mentioned structural setting of the first chamber 11 and the cooperation with the guide plate 41, the medium channel T flows smoothly, and the cross-sectional area of ​​the medium channel T in each area of ​​the first chamber 11 changes less, and the flow velocity consistency is good. More specifically, the cross-sectional area of ​​the medium channel T formed between the inner wall of the first chamber 11 and the guide plate 41 is substantially equal to the cross-sectional area of ​​the medium channel T of the second chamber 12 or the third chamber 13, so that the heat storage medium flow consistency in each area of ​​the heat storage chamber 10 is better.

[0037] In order to further ensure the flow speed 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 2-4 times the cross-sectional area of ​​the medium channel T to ensure sufficient oxidation reaction.

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

[0039] like Figure 4Another structural form of the guide plate 41 and the heat storage chamber 10 matched therewith are shown. In this embodiment, the guide plate 41 includes an inverted cone portion 414, the upper end of the inverted cone portion 414 is connected to the inner wall of the first chamber 11, and the lower end of the inverted cone portion 414 has a gap with the inner wall of the first chamber 11, the area between the guide plate 41 and the first chamber 11 forms the reaction cavity S, and the inner area of ​​the guide plate 41 forms the medium channel T.

[0040] The guide plate 41 also includes a cylindrical portion 415 located at the lower side of the inverted cone portion 414. The lower opening of the cylindrical portion 415 is arranged opposite to the upper end of the third chamber 13 with a spacing therebetween. The cross-section of the cylindrical portion 415 is consistent with the cross-section of the third chamber 13.

[0041] The heat storage chamber 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 guide plate 41 is connected to the transition zone between the conical wall 111 and the cylindrical wall 112 of the heat storage chamber 10, and the lower end of the guide plate 41 extends to the inner area of ​​the inverted conical wall 113 of the heat storage chamber 10.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An organic waste gas treatment system, It is characterized in that include: A heat storage chamber, wherein the heat storage chamber is filled with a heat storage medium, a medium inlet and an exhaust gas outlet are arranged at the top of the heat storage chamber, and a medium outlet and an exhaust gas inlet are arranged at the bottom of the heat storage chamber, and the organic waste gas enters the heat storage chamber through the exhaust gas inlet and undergoes an oxidation reaction under the heating action of the heat storage medium, and the gas after the reaction is discharged through the exhaust gas outlet; A circulation power device is connected with the medium inlet and the medium outlet of the heat storage chamber through a circulation 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; Wherein, a flow guiding structure is arranged in the middle area of ​​the heat storage chamber, and the flow guiding structure forms a part of the area in the heat storage chamber into a reaction cavity which is not filled with heat storage medium.

2. An organic waste gas treatment system according to claim 1, It is characterized in that The guide structure comprises a guide plate, and an extension direction of at least a part of the guide plate is obliquely intersecting with a vertical direction.

3. An organic waste gas treatment system according to claim 1 or 2, It is characterized in that The heat storage chamber includes a first subchamber in which the guide structure is arranged, and a second subchamber and a third subchamber respectively arranged on the upper and lower sides of the first subchamber; the cross-sectional areas of the second subchamber and the third subchamber are consistent, and the cross-sectional area of ​​the first subchamber is greater than the cross-sectional area of ​​the second subchamber or the third subchamber.

4. An organic waste gas treatment system according to claim 3, It is characterized in that The guide plate includes a conical portion, the area between the conical portion of the guide plate and the first chamber forms a medium channel, and the inner area of ​​the conical portion of the guide plate forms the reaction cavity.

5. An organic waste gas treatment system according to claim 4, It is characterized in that The first chamber comprises a tapered wall, and the tapered wall of the first chamber is arranged parallel to the tapered portion of the guide plate.

6. An organic waste gas treatment system according to claim 5, It is characterized in that The guide plate further comprises a cylindrical portion, the cylindrical portion of the guide plate is located at the lower side of the conical portion, and the lower opening of the cylindrical portion of the guide plate is arranged opposite to the upper end of the third chamber at a distance therefrom.

7. An organic waste gas treatment system according to claim 6, It is characterized in that The first chamber further comprises a cylindrical wall and an inverted conical wall, wherein the cylindrical wall is located at the lower side of the conical wall, the inverted conical wall is located at the lower side of the cylindrical wall, the conical wall is connected to the second chamber, and the inverted conical wall is connected to the third chamber.

8. An organic waste gas treatment system according to claim 4, It is characterized in that The cross-sectional area of ​​the medium channel in the first sub-chamber is substantially equal to the cross-sectional area of ​​the medium channel in the second sub-chamber or the third sub-chamber.

9. An organic waste gas treatment system according to claim 3, It is characterized in that The guide plate includes an inverted cone portion, the upper end of the inverted cone portion is connected to the inner wall of the first chamber, and the lower end of the inverted cone portion has a gap with the inner wall of the first chamber. The area between the guide plate and the first chamber forms the reaction cavity, and the inner area of ​​the guide plate forms the medium channel.

10. An organic waste gas treatment system according to claim 3, It is characterized in that The treatment system also includes a heating device connected to the third sub-chamber of the thermal storage chamber.

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