CN-117781295-B - NVOCs catalytic reduction process and equipment embedded in RTO

CN117781295BCN 117781295 BCN117781295 BCN 117781295BCN-117781295-B

Abstract

The invention discloses a high-efficiency low-consumption NVOCs catalytic reduction process and equipment embedded in RTO, which belong to the field of organic waste gas treatment and comprise a combustion chamber, a plurality of regenerators and an integrated pipeline, wherein one of the two pipelines at the upper part and the lower part of the integrated pipeline is an air inlet pipeline, the other is an exhaust pipeline, the middle pipeline is a middle gas cabin inlet and outlet connecting pipeline, NVOCs catalyst is arranged in the middle gas cabin inlet and outlet connecting pipeline, the middle gas cabin inlet and outlet connecting pipeline is divided into a plurality of sub inlet and outlet connecting pipelines by a plurality of partition boards and communicated with the regenerators in a one-to-one correspondence manner, each sub inlet and outlet connecting pipeline is provided with two air vents which are respectively communicated with the pipelines at the upper part and the lower part, and each air vent is independently controlled to be opened and closed. The device can effectively pre-catalyze NVOCs to avoid exceeding of NOx of an RTO outlet, the air inlet pipeline and the exhaust pipeline are concentrated on one side of the air bin, the equipment is compact in arrangement and small in occupied area, the device is convenient to check and maintain, the waste heat of the exhaust is fully utilized by pre-catalysis, a heating device is not needed to be additionally arranged, and the operation cost is low.

Inventors

LU CHAOYANG
XU ZUNZHU
ZHANG JIWEN
SHAO YONG
LI MING
SUN YONGJIA
JIANG HAITAO
WANG HONG

Assignees

南京大学环境规划设计研究院集团股份公司
南大恩洁优环境技术(江苏)股份公司

Dates

Publication Date: 20260505
Application Date: 20231220

Claims (8)

1. The utility model provides a heat accumulation formula burns device, includes combustion chamber and sets up in the combustion chamber below, and a plurality of regenerator rather than the intercommunication, its characterized in that: also comprises an integrated pipeline; the integrated pipeline comprises an upper pipeline, a middle pipeline and a lower pipeline which are transversely integrated; one of the two pipelines at the upper part and the lower part is an air inlet pipeline, and the other pipeline is an exhaust pipeline; The middle pipeline is a middle gas bin inlet and outlet connecting pipeline; NVOCs of catalyst is arranged in the middle gas bin inlet and outlet connecting pipeline, and the NVOCs catalyst is a catalyst for catalyzing and reducing N into N 2 by utilizing the reducibility of C and H in organic matters; The number of the sub-inlet and outlet connecting pipelines is equal to the number of the regenerators and corresponds to the number of the regenerators one by one, and the sub-inlet and outlet connecting pipelines are communicated with the corresponding regenerators; each sub inlet and outlet connecting pipeline is provided with two air vents which are respectively communicated with the upper pipeline and the lower pipeline; Poppet valves are arranged on two air vents of the sub inlet and outlet connecting pipeline and respectively control the opening and closing of the two air vents; The valve plates of the upward lifting valve plates are respectively arranged in the pipeline at the upper part of the integrated pipeline, the upper vent openings are opened, the valve plates are downwards moved to cover the valve openings, the upper vent openings are closed, the valve plates of the downward lifting valve plates are respectively arranged in the pipeline at the lower part of the integrated pipeline, the valve plates are downwards pushed to be separated from the valve openings, the lower vent openings are opened, the valve plates are upwards lifted to cover the valve openings, the lower vent openings are closed, and the valve bodies of the upward lifting valve plates and the downward lifting valve plates are respectively arranged above the integrated pipeline.
2. The heat accumulating type incineration device according to claim 1, wherein: The device also comprises a high-temperature flue gas mixing box; The high-temperature flue gas mixing box is communicated with the combustion chamber; the high-temperature flue gas mixing box is also communicated with an exhaust pipeline of the integrated pipeline through a high-temperature flue gas heat exchange pipeline.
3. The heat accumulating type incineration device according to claim 2, wherein: the device also comprises an exhaust funnel; An exhaust pipeline of the integrated pipeline is communicated with the exhaust barrel; the high-temperature flue gas mixing box is also communicated with the exhaust funnel through a high-temperature flue gas direct exhaust pipeline; And the high-temperature flue gas heat exchange pipeline and the high-temperature flue gas direct discharge pipeline are both provided with proportional regulating valves.
4. The heat accumulating type incineration device according to claim 1, wherein: the filling amount of NVOCs catalyst is half of the space of the middle gas bin in-out connecting pipeline, and is positioned at one side adjacent to the exhaust pipeline.
5. The heat accumulating type incineration device according to claim 1, wherein: The integrated pipeline is provided with a plurality of lifting valve group access ports, and the lifting valve group access ports correspond to a group of upward lifting valves and downward lifting valves of each sub inlet and outlet connecting pipeline.
6. The heat accumulating type incineration device according to claim 1, wherein: Among the two pipelines at the upper part and the lower part of the integrated pipeline, the pipeline at the upper part is an air inlet pipeline, and the pipeline at the lower part is an air exhaust pipeline.
7. The heat accumulating type incineration device according to claim 1, wherein: wherein, the middle gas bin is provided with a grid in the inlet and outlet connecting pipeline, NVOCs catalyst is filled on the grid.
8. A NVOCs catalytic reduction process, which is characterized in that the heat accumulating type incinerator according to any one of claims 1-7 is used in the process; The waste gas containing nitrogen volatile organic compounds firstly undergoes oxidation-reduction reaction with NVOCs catalyst, and then enters a combustion chamber for combustion; In the oxidation-reduction reaction of the nitrogen-containing volatile organic compound waste gas and NVOCs catalyst, the oxidation reaction of C and H in the nitrogen-containing volatile organic compound waste gas occurs, and N is catalytically reduced to N 2 .

Description

NVOCs catalytic reduction process and equipment embedded in RTO Technical Field The invention belongs to the field of organic waste gas treatment, relates to a heat accumulating type incineration device, and particularly relates to a high-efficiency low-consumption NVOCs catalytic reduction process and equipment embedded in RTO. Background Nitrogen-containing volatile organic compounds (NVOCs) are a common type of VOCs, are common volatile malodorous organic compounds (MVOCs) due to the fact that N element is contained, and meanwhile, secondary pollutants are easy to generate in the NVOCs treatment process, so that effective treatment of NVOCs becomes a major problem of current concern. NVOCs is most commonly derived from Dimethylacetamide (DMAC), dimethylformamide (DMF), N-dimethylpyrrolidone (NMP) and the like, and the several nitrogen-containing organic matters are widely applied to the insulating film material industry, the semiconductor industry, the tanning industry, the lithium battery industry and the like. The heat accumulating type incinerator (RTO) is the most efficient VOCs treatment technology accepted at present, and gradually becomes the main stream process, but when NVOCs is thoroughly oxidized and decomposed in a high-temperature (750 ℃) environment in a hearth, N element can be converted into NOx, and the NOx in tail gas is easy to exceed the standard. Meanwhile, when the concentration of NVOCs in VOCs is higher, for example, when the concentration of DMAC reaches 100ppm, 100ppm (corresponding to the mass concentration of about 200mg/m 3) of NOx is generated after RTO combustion, the concentration exceeds the limit value concentration specified in the integrated emission Standard of atmospheric pollutants (DB 32/4041-2021), and 100ppm of NVOCs is more common in VOCs emitted in industries such as insulating film material industry, semiconductor industry, tanning industry, lithium battery industry and the like. At present, common practice is to add SCR at the end of RTO to remove NOx, which is generally difficult for enterprises with investment and operation cost to bear, and the whole treatment system is huge. Disclosure of Invention The invention provides a high-efficiency low-consumption NVOCs catalytic reduction process and equipment embedded in RTO (room temperature oxygen) to overcome the defects of the prior art. The heat accumulating type incinerator with the NVOCs catalytic reduction embedded therein comprises a combustion chamber and a plurality of heat accumulating chambers which are arranged below the combustion chamber and are communicated with the combustion chamber, and is characterized by further comprising integrated pipelines, wherein the integrated pipelines comprise an upper part, a middle part and a lower part which are transversely integrated, one of the two pipelines at the upper part and the lower part is an air inlet pipeline, the other pipeline is an air outlet pipeline, the middle pipeline is a middle gas bin inlet and outlet connecting pipeline, NVOCs catalyst is arranged in the middle gas bin inlet and outlet connecting pipeline, the NVOCs catalyst is a catalyst which is used for catalytically reducing N into N 2 by using C and H in NVOCs as a reducing agent under a heating condition, the middle gas bin inlet and outlet connecting pipeline is divided into a plurality of sub inlet and outlet connecting pipelines by a plurality of partition boards, the number of the sub inlet and outlet connecting pipelines are equal to the number of the heat accumulating chambers and are in one-to-one correspondence, each sub inlet and outlet connecting pipeline is communicated with the corresponding heat accumulating chamber, each sub inlet and outlet connecting pipeline is provided with two air vents which are respectively communicated with the upper part and the lower part pipeline, and each air vent can be independently controlled to be opened and closed. The invention further provides a heat accumulating type incineration device with the built-in NVOCs catalytic reduction, which can be characterized by further comprising a high-temperature flue gas mixing box, wherein the high-temperature flue gas mixing box is communicated with the combustion chamber, and the high-temperature flue gas mixing box is also communicated with an exhaust pipeline of the integrated pipeline through a high-temperature flue gas heat exchange pipeline. The invention further provides a heat accumulating type incineration device with the built-in NVOCs catalytic reduction, which is characterized by further comprising an exhaust barrel, wherein the exhaust pipeline of the integrated pipeline is communicated with the exhaust barrel, the high-temperature flue gas mixing box is also communicated with the exhaust barrel through a high-temperature flue gas direct exhaust pipeline, and the high-temperature flue gas heat exchange pipeline and the high-temperature flue gas direct exhaust pipeline are both provid