RTO device with built-in spraying chamber

Abstract

The utility model discloses an RTO device with a built-in spray chamber, which comprises a flame arrester. A first waste gas switching valve, a second waste gas switching valve, a third waste gas switching valve, a first flue gas switching valve, a second flue gas switching valve, a third flue gas switching valve, a first back flushing valve, a second back flushing valve and a third back flushing valve are respectively arranged outside the flame arrester. The spray tower is arranged in the RTO body, so that the influence of high-temperature flue gas on a switching valve is avoided, a front spray tower, a rear spray tower, a flue gas mixing tank, a high-temperature valve and a cooling tower are omitted, the number of spray pumps is reduced, the equipment investment is reduced, the control requirement is reduced, the equipment failure risk is reduced, and the occupied area is reduced; the device has the advantages of low cost, low failure rate and small occupied area.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to an RTO device with a built-in spray chamber. Background Art

[0002] The traditional RTO process is as follows Figure 1 As shown, the exhaust gas first enters the spray tower 1 for spray washing, and the alkali solution delivered by the spray pump 2 contacts the exhaust gas in the spray tower 1, and the water-soluble substances in the exhaust gas are washed away. The exhaust gas then passes through the flame arrester 3 and enters the flue gas distribution chamber 5 through the switching valve 4. It is then preheated to about 750°C in the heat storage chamber A and enters the thermal oxidation chamber 8. It is heated to above 800°C by the burner 7. The exhaust gas then enters the heat storage chamber B to release heat and then is discharged from the RTO device. When the organic matter content in the exhaust gas is high and the temperature of the thermal oxidation chamber 8 is greater than 800°C, in order to ensure that the outlet temperature of the heat storage chamber does not rise, which will affect the sealing and performance of the switching valve 4, part of the high-temperature exhaust gas enters the mixing tank 12 together with the exhaust gas after heat release through the high-temperature regulating valve 11. The exhaust gas then enters the cooling tower 13 to continue cooling. Finally, the exhaust gas enters the post-spray tower 14 for spray washing and is finally discharged from the system.

[0003] The traditional RTO device includes a front spray tower 1, a rear spray tower 14, a high-temperature valve 11, a flue gas mixing tank 12, a cooling tower 13, an RTO body, and front and rear spray pumps 2 and 15. During operation, the opening of the high-temperature valve 11 is adjusted according to the temperature of the thermal oxidation chamber 8. When the high-temperature valve 11 fails, the furnace must be shut down for processing. At the same time, when backfire occurs, although it will not affect the equipment before the flame arrester, the exhaust gas and flue gas switching valves will still fail due to high temperature. The system has many equipment, complex control, high investment, and a large footprint. Therefore, it is necessary to design and transform the RTO device with a built-in spray chamber to effectively prevent the problems of complex equipment, high cost, high failure rate, and a large footprint. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the purpose of the present invention is to provide an RTO device with a built-in spray chamber, which has the advantages of low cost, low failure rate and small footprint. It solves the problems of the traditional RTO device including a front spray tower 1, a rear spray tower 14, a high-temperature valve 11, a flue gas mixing tank 12, a cooling tower 13, an RTO body, and front and rear spray pumps 2 and 15. During operation, the opening of the high-temperature valve 11 is adjusted according to the temperature of the thermal oxidation chamber 8. When the high-temperature valve 11 fails, the furnace must be shut down for processing. At the same time, when backfire occurs, although it will not affect the equipment before the flame arrester, the exhaust gas and flue gas switching valves will still fail due to high temperature, the system has more equipment, complex control, high investment, and a large footprint.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an RTO device with a built-in spray chamber, comprising a flame arrester, wherein the flame arrester is provided with a first exhaust gas switching valve, a second exhaust gas switching valve, a third exhaust gas switching valve, a first flue gas switching valve, a second flue gas switching valve, a third flue gas switching valve, a first back-blow valve, a second back-blow valve and a third back-blow valve on the outside, and the flame arrester is provided with a flue gas distribution chamber aa, a flue gas distribution chamber bb, a flue gas distribution chamber cc, a spray chamber a, a spray chamber b, a spray chamber c, a spray pump, a heat storage chamber A, a heat storage chamber B, a heat storage chamber C, a thermal oxidation chamber, a burner, an emergency discharge Valve and back-blowing machine, the interior of the spray chamber a, spray chamber b and spray chamber c are respectively provided with a first demister, a second demister and a third demister, the surface of the spray pipe in the spray chamber a, spray chamber b and spray chamber c is provided with a first switching valve, a second switching valve and a third switching valve, the flue gas distribution chamber aa is respectively connected with the first exhaust gas switching valve, the first flue gas switching valve and the first back-blowing valve, the flue gas distribution chamber bb is respectively connected with the second exhaust gas switching valve, the second flue gas switching valve and the second back-blowing valve, and the flue gas distribution chamber cc is respectively connected with the third exhaust gas switching valve, the third flue gas switching valve and the third back-blowing valve.

[0006] As a preferred embodiment of the present invention, a spray layer and a filler layer are respectively provided inside the spray chamber a, the spray chamber b and the spray chamber c.

[0007] As a preferred embodiment of the present invention, the first demister, the second demister and the third demister are all wire mesh demisters or baffle demisters, and saddle ring fillers are provided above the first demister, the second demister and the third demister.

[0008] As a preferred embodiment of the present invention, the number of the spray pumps is two.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] 1. The utility model places the spray tower inside the RTO body, avoiding the influence of high-temperature flue gas on the switching valve, eliminating the front and rear spray towers, flue gas mixing tanks, high-temperature valves, and cooling towers, reducing the number of spray pumps, reducing equipment investment, reducing control requirements, reducing the risk of equipment failure, and reducing the floor space. The device has the advantages of low cost, low failure rate and small footprint.

[0011] 2. In the present invention, spray layers and packing layers are respectively provided inside spray chamber a, spray chamber b and spray chamber c. Exhaust gas enters the packing layer of spray chamber a, and the spray liquid is transported by the spray pump and enters the spray chamber a through the first switching valve. It contacts with the exhaust gas in the packing layer, undergoes a mass transfer process, and the water-soluble substances in the exhaust gas are absorbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a flow chart of a traditional RTO device;

[0013] Figure 2 This is a flow chart of an RTO device with a built-in spray chamber in the utility model.

[0014] In the figure: 101, flame arrester; 201, first exhaust gas switching valve; 202, second exhaust gas switching valve; 203, third exhaust gas switching valve; 301, first flue gas switching valve; 302, second flue gas switching valve; 303, third flue gas switching valve; 401, first back-blow valve; 402, second back-blow valve; 403, third back-blow valve; 501, spray pump; 601, burner; 701, thermal oxidation chamber; 801, emergency discharge valve; 901, back-blower; 1001, first switching valve; 1002, second switching valve; 1003, third switching valve; 1101, first demister; 1102, second demister; 1103, third demister. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0016] like Figures 1 to 2As shown, an RTO device with a built-in spray chamber includes a flame arrester 101. The flame arrester 101 is respectively provided with a first exhaust gas switching valve 201, a second exhaust gas switching valve 202, a third exhaust gas switching valve 203, a first flue gas switching valve 301, a second flue gas switching valve 302, a third flue gas switching valve 303, a first back-blow valve 401, a second back-blow valve 402 and a third back-blow valve 403 on the outside. The flame arrester 101 is respectively provided with a flue gas distribution chamber aa, a flue gas distribution chamber bb, a flue gas distribution chamber cc, a spray chamber a, a spray chamber b, a spray chamber c, a spray pump 501, a heat storage chamber A, a heat storage chamber B, a heat storage chamber C, a thermal oxidation chamber 701, a burner 601, an emergency discharge valve 801 and a back-blower 901 on the outside. The interiors of spray chamber a, spray chamber b and spray chamber c are respectively provided with a first demister 1101, a second demister 1102 and a third demister 1103; the surfaces of the spray pipes in spray chamber a, spray chamber b and spray chamber c are respectively provided with a first switching valve 1001, a second switching valve 1002 and a third switching valve 1003; the flue gas distribution chamber aa is respectively connected to the first exhaust gas switching valve 201, the first flue gas switching valve 301 and the first back-blow valve 401; the flue gas distribution chamber bb is respectively connected to the second exhaust gas switching valve 202, the second flue gas switching valve 302 and the second back-blow valve 402; the flue gas distribution chamber cc is respectively connected to the third exhaust gas switching valve 203, the third flue gas switching valve 303 and the third back-blow valve 403.

[0017] refer to Figure 2 The interiors of spray chamber a, spray chamber b and spray chamber c are respectively provided with a spray layer and a filler layer.

[0018] As a technical optimization solution of the present invention, spray layers and packing layers are respectively provided inside spray chamber a, spray chamber b and spray chamber c. The exhaust gas enters the packing layer of spray chamber a, and the spray liquid is transported by the spray pump 501 and enters the spray chamber a through the first switching valve 1001. It contacts the exhaust gas in the packing layer and undergoes a mass transfer process, and the water-soluble substances in the exhaust gas are absorbed.

[0019] refer to Figure 2 The first demister 1101, the second demister 1102 and the third demister 1103 all use wire mesh demisters or baffle demisters, and saddle ring fillers are arranged above the first demister 1101, the second demister 1102 and the third demister 1103.

[0020] As a technical optimization solution of the present invention, the first demister 1101, the second demister 1102 and the third demister 1103 all use wire mesh demisters or baffle demisters, and saddle ring fillers are arranged above the first demister 1101, the second demister 1102 and the third demister 1103. Further demisting can be achieved by arranging saddle ring fillers above the first demister 1101, the second demister 1102 and the third demister 1103.

[0021] refer to Figure 2 , the number of spray pumps 501 is two.

[0022] As a technical optimization solution of the present invention, by setting the number of spray pumps 501 to two, the efficiency and effect of spraying can be improved.

[0023] refer to Figure 2 , within one action cycle, the working status of each valve is as follows:

[0024] Thermal storage chamber A B C A B C A B C Exhaust gas switching valve open open open Flue gas switching valve open open open Backflush valve open open open Spray valve open open open

[0025] The working principle and use process of the utility model are as follows: when in use, the exhaust gas passes through the flame arrester 101 and the first switching valve 1001 into the smoke distribution chamber aa, and then enters the packing layer of the spray chamber a. The spray liquid is transported by the spray pump 501 and enters the spray chamber a through the first switching valve 1001, where it contacts the exhaust gas in the packing layer to carry out a mass transfer process. The water-soluble substances in the exhaust gas are absorbed, and then the washed exhaust gas passes through the first demister 1101 to remove the water mist, and then enters the heat storage chamber A to absorb heat. The exhaust gas is preheated to about 750°C and enters the thermal oxidation chamber 701.

[0026] The first demister 1101, the second demister 1102, and the third demister 1103 can all be in the form of wire mesh and baffles. The surfaces of the first demister 1101, the second demister 1102, and the third demister 1103 are all arranged with saddle ring fillers. The exhaust gas enters the thermal oxidation chamber 701 and is heated to above 800°C by the burner 601. The organic matter in the exhaust gas is oxidized and decomposed. Then, the flue gas generated in the thermal oxidation chamber 701 enters the heat storage chamber B to release heat. The flue gas releases heat to the heat storage ceramic, and the flue gas temperature decreases. Then, the flue gas enters the spray chamber b and comes into contact with the spray liquid from the second spray valve to remove the remaining harmful substances in the flue gas. At the same time, the flue gas temperature continues to decrease to about 70°C. Then, the flue gas passes through the flue gas distribution chamber bb and is discharged from the system through the second flue gas switching valve 302.

[0027] Then, the back-blowing machine 901 draws air into the flue gas distribution chamber CC through the third switching valve 1003, purging the flue gas distribution chamber CC, the spray chamber C, and the heat storage chamber C, blowing the organic gas therein to the thermal oxidation chamber 701. At this time, the spray third switching valve 1003 is closed. After a certain period of time, the third back-blowing valve 403 is closed, the spray third switching valve 1003 is opened, and the third flue gas switching valve 303 is opened. At this time, the flue gas enters the heat storage chamber C and releases heat.

[0028] Further close the third flue gas switching valve 303, and then open the second exhaust gas switching valve 202. The exhaust gas enters the thermal oxidation chamber 701 through the flue gas distribution chamber bb, the spray chamber b, and the heat storage chamber B. Then close the first exhaust gas switching valve 201, close the spray first switching valve 1001, open the first purge valve for purge, and then all valves are switched in turn in the above order.

[0029] In one action cycle, the working status of each valve is as follows:

[0030] Thermal storage chamber A B C A B C A B C Exhaust gas switching valve open open open Flue gas switching valve open open open Backflush valve open open open Spray valve open open open

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An RTO device with a built-in spray chamber, comprising a flame arrester (101), characterized in that: The flame arrester (101) is provided with a first exhaust gas switching valve (201), a second exhaust gas switching valve (202), a third exhaust gas switching valve (203), a first flue gas switching valve (301), a second flue gas switching valve (302), a third flue gas switching valve (303), a first back-blow valve (401), a second back-blow valve (402) and a third back-blow valve (403) on the outside. The flame arrester (101) is provided with a flue gas distribution chamber aa, a flue gas distribution chamber bb, a flue gas distribution chamber cc, a spray chamber a, a spray chamber b, a spray chamber c, a spray pump (501), a heat storage chamber A, a heat storage chamber B, a heat storage chamber C, a thermal oxidation chamber (701), a burner (601), an emergency discharge valve (801) and a back-blower (901) on the outside. The spray chamber a, the spray chamber b and the spray chamber c are provided with a first exhaust gas switching valve (201), a second exhaust gas switching valve (202), a third exhaust gas switching valve (203), a first flue gas switching valve (301), a second flue gas switching valve (302), a third flue gas switching valve (303), a first back-blow valve (401), a second back-blow valve (402) and a third back-blow valve (403) on the outside. The interior of chamber c is respectively provided with a first demister (1101), a second demister (1102) and a third demister (1103); the surfaces of the spray pipes in the spray chambers a, b and c are respectively provided with a first switching valve (1001), a second switching valve (1002) and a third switching valve (1003); the flue gas distribution chamber aa is respectively connected to the first exhaust gas switching valve (201), the first flue gas switching valve (301) and the first back-blow valve (401); the flue gas distribution chamber bb is respectively connected to the second exhaust gas switching valve (202), the second flue gas switching valve (302) and the second back-blow valve (402); the flue gas distribution chamber cc is respectively connected to the third exhaust gas switching valve (203), the third flue gas switching valve (303) and the third back-blow valve (403).

2. The RTO device with a built-in spray chamber according to claim 1, characterized in that: The spray chamber a, the spray chamber b and the spray chamber c are respectively provided with a spray layer and a filler layer inside.

3. The RTO device with a built-in spray chamber according to claim 1, characterized in that: The first demister (1101), the second demister (1102) and the third demister (1103) all adopt wire mesh demisters or baffle demisters, and saddle ring fillers are arranged above the first demister (1101), the second demister (1102) and the third demister (1103).

4. The RTO device with a built-in spray chamber according to claim 1, characterized in that: The number of the spray pumps (501) is two.

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