CN211753940U - VOCs waste gas catalytic oxidation equipment - Google Patents
VOCs waste gas catalytic oxidation equipment Download PDFInfo
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- CN211753940U CN211753940U CN201922485043.4U CN201922485043U CN211753940U CN 211753940 U CN211753940 U CN 211753940U CN 201922485043 U CN201922485043 U CN 201922485043U CN 211753940 U CN211753940 U CN 211753940U
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Abstract
The utility model provides a VOCs waste gas catalytic oxidation equipment, catalytic oxidation equipment includes: the device comprises a waste gas pipe, a flame arrester, a catalytic fan, a first heat exchanger, a second heat exchanger, a catalytic oxidation bed, a tail gas pipeline and a flue. Above-mentioned technical scheme has adopted the two heat transfer systems of first heat exchanger and second heat exchanger, is provided with exhaust gas channel and tail gas passageway in first heat exchanger and the second heat exchanger, and waste gas carries out the heat exchange as cold source, tail gas as the heat source, improves the temperature through first heat exchanger and second heat exchanger waste gas, reduces the temperature of exhaust tail gas. Through the aperture of controlling second governing valve and third governing valve, control the waste gas volume that gets into in first heat exchanger and the second heat exchanger, and then adjust the waste gas temperature who gets into catalytic oxidation bed, effectively utilized high temperature tail gas, reached the controllable effect of catalytic oxidation bed pending waste gas temperature simultaneously.
Description
Technical Field
The utility model relates to an environmental protection field, in particular to VOCs waste gas catalytic oxidation equipment.
Background
In the production process of chemical industry, pharmacy, printing, coating, electronics and other industries, a large amount of organic solvent is used. For example, the content of organic solvent in the paint is about 70%, the content of solvent in printing industry is about 50%, and the common solvent mainly comprises aromatic hydrocarbons (toluene, xylene, ethylbenzene, etc.), esters, alcohols, gasoline, etc. When the solvents are volatilized, waste gas with organic steam as a main pollutant is generated, so that the atmospheric environment is damaged, and effective treatment measures are required to be taken for treatment. In particular to the treatment of some organic waste gas with complex medium and high concentration components, a Regenerative Thermal Oxidizer (RTO) technology and a catalytic oxidation method (CO) are generally adopted, and the organic waste gas is degraded into inorganic components such as carbon dioxide, water and the like through high-temperature oxidation. The catalytic oxidation is to reduce the activation energy of the oxidation reaction of the VOCs under the action of the catalyst, so that the VOCs can be oxidized and decomposed at a lower temperature, the operation temperature and the operation cost of equipment are obviously reduced compared with RTO, and the catalytic oxidation takes a place in the waste gas treatment market.
In order to reduce the energy consumption of the system operation, the existing catalytic oxidation equipment is generally provided with a one-stage or two-stage heat exchanger in series connection, heat carried in high-temperature tail gas after catalytic oxidation is recycled for preheating waste gas to be treated, and when a large amount of heat is recycled, the preheating temperature of the waste gas to be treated is too high, so that the system is frequently over-heated, and especially when the concentration of VOCs (volatile organic compounds) is higher, the safe and stable operation of the system is influenced.
SUMMERY OF THE UTILITY MODEL
Therefore, need provide one kind when waste gas VOCs concentration is higher, the effectual control pending waste gas preheating temperature, avoid the system overtemperature to cause the potential safety hazard, VOCs waste gas catalytic oxidation equipment with adjustable preheating temperature.
To achieve the above object, the inventors provide the catalytic oxidation apparatus comprising: the device comprises an exhaust gas pipe, a flame arrester, a catalytic fan, a first heat exchanger, a second heat exchanger, a catalytic oxidation bed, an exhaust gas pipeline and a flue, wherein an exhaust gas channel and an exhaust gas channel are arranged in the first heat exchanger and the second heat exchanger;
a combustible gas detector and a first cut-off valve are sequentially arranged between the gas inlet end of the waste gas pipe and the flame arrester, the flame arrester is connected with the catalytic fan through the waste gas pipe connected with a fresh air pipe, a first regulating valve is arranged on the fresh air pipe, the catalytic fan is connected with the waste gas inlet end of a first heat exchanger through the waste gas pipe provided with a second regulating valve, the waste gas outlet end of the first heat exchanger is connected with the waste gas inlet end of a second heat exchanger through the waste gas pipe, the second heat exchanger is connected with the gas inlet end of the catalytic oxidation bed through the waste gas pipe provided with a temperature detector, the waste gas pipe between the catalytic fan and the second regulating valve is connected with the waste gas inlet end of the second heat exchanger through a first overrunning pipeline, and a third regulating valve is arranged on the first overrunning pipeline;
the air outlet end of the catalytic oxidation bed is connected with the tail gas inlet end of a second heat exchanger through a tail gas pipeline, the tail gas outlet end of the second heat exchanger is connected with the tail gas inlet end of a first heat exchanger through a tail gas pipeline, and the tail gas outlet end of the first heat exchanger is connected with a flue through a tail gas pipeline;
the combustible gas detector is interlocked with the first regulating valve and is connected with the PLC; and the second regulating valve and the third regulating valve are interlocked with the temperature detector and are connected with the PLC.
Further, the catalytic oxidation bed is provided with an auxiliary heating system, and the auxiliary heating system is interlocked with the temperature detector and is connected with the PLC.
Further, an exhaust pipe between the combustible gas detector and the first cut-off valve is connected with the flue through a second overrunning pipeline, and a second cut-off valve is arranged on the second overrunning pipeline.
Further, the opening degrees of the first regulating valve, the second regulating valve and the third regulating valve are 0-90 degrees.
Further, the first heat exchanger and the second heat exchanger are tube type heat exchangers or plate type heat exchangers.
Further, the PLC controller is configured to perform the following steps:
obtaining the concentration of the combustible gas;
judging whether the concentration of the combustible gas exceeds a preset concentration value,
when the concentration detection data of the combustible gas exceed the concentration preset value, the opening degree of the first regulating valve is increased; otherwise, the opening degree of the first regulating valve is reduced.
Further, the PLC controller is configured to perform the following steps: acquiring the inlet air temperature of the catalytic oxidation bed;
judging whether the inlet air temperature of the catalytic oxidation bed exceeds a preset temperature value,
when the inlet air temperature of the catalytic oxidation bed exceeds a preset temperature value, the opening degree of the second regulating valve is reduced, and the opening degree of the third regulating valve is increased; otherwise, the opening degree of the second regulating valve is increased, and the opening degree of the third regulating valve is reduced.
Be different from prior art, above-mentioned technical scheme has adopted the two heat transfer systems of first heat exchanger and second heat exchanger, is provided with exhaust gas channel and tail gas passageway in first heat exchanger and the second heat exchanger, and waste gas is as the cold source, tail gas as the heat source and carries out the heat exchange, improves the temperature through first heat exchanger and second heat exchanger waste gas, reduces the temperature of exhaust tail gas. Through the aperture of controlling second governing valve and third governing valve, control the waste gas volume that gets into in first heat exchanger and the second heat exchanger, through adjusting the waste gas volume that carries out the heat exchange once and the waste gas volume of secondary heat exchange, and then adjust the waste gas temperature who gets into catalytic oxidation bed, effectively utilized high temperature tail gas, reached the controllable effect of catalytic oxidation bed pending waste gas temperature simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of a catalytic oxidation apparatus for waste gases of VOCs according to an embodiment.
Description of reference numerals:
1. the organic waste gas is discharged from the waste gas,
101. an exhaust gas pipe is arranged on the exhaust gas pipe,
102. a flame arrester is arranged on the outer wall of the shell,
103. a catalytic air blower is arranged on the air inlet of the air conditioner,
104. a second cut-off valve is arranged on the first cut-off valve,
105. a first cut-off valve is arranged on the first valve,
106. a first regulating valve is arranged on the upper portion of the cylinder,
107. a combustible gas detector,
201. a first heat exchanger for exchanging heat with a second heat exchanger,
202. a second heat exchanger for exchanging heat between the first heat exchanger and the second heat exchanger,
203. a second regulating valve is arranged on the upper portion of the cylinder,
204. a third regulating valve is arranged on the first valve,
205. a temperature detector for detecting the temperature of the liquid,
301. a catalytic oxidation bed is arranged on the bed body,
401. an exhaust gas pipeline is arranged on the tail gas pipeline,
402. flue duct
。
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the present embodiment provides a catalytic oxidation apparatus for exhaust gas containing VOCs, the catalytic oxidation apparatus comprising: the system comprises a waste gas pipe 101, a flame arrester 102, a catalytic fan 103, a first heat exchanger 201, a second heat exchanger 202, a catalytic oxidation bed 301, a tail gas pipeline 401, a flue 402 and a PLC (programmable logic controller);
the flame arrester consists of a flame arresting core, a flame arrester shell and accessories and is a safety device for preventing flame spread of flammable gas/flammable liquid steam.
The catalytic oxidation bed is composed of a catalyst bed layer, an auxiliary heating system, a heat-insulating layer, an equipment shell and accessories, and the purification rate of the organic waste gas is over 95 percent.
An exhaust gas channel and a tail gas channel are arranged in the first heat exchanger 201 and the second heat exchanger 202; the organic waste gas 1 before entering the catalytic oxidation bed is used as a cold source, and the tail gas after catalytic oxidation is used as a heat source, and heat exchange is carried out in a heat exchanger.
A combustible gas detector 107 and a first cut-off valve 105 are sequentially arranged between the air inlet end of the waste gas pipe 101 and the flame arrester 102, the flame arrester 102 is connected with the catalytic fan 103 through the waste gas pipe connected with a fresh air pipe, the fresh air pipe is used for inputting fresh air, the fresh air pipe is provided with a first regulating valve 106, the first regulating valve 106 is used for regulating the fresh air quantity entering the waste gas pipe,
the catalytic fan 103 is connected with the waste gas inlet end of the first heat exchanger 201 through a waste gas pipe provided with a second regulating valve 203, the waste gas outlet end of the first heat exchanger 201 is connected with the waste gas inlet end of the second heat exchanger 202 through a waste gas pipe, the second heat exchanger 202 is connected with the gas inlet end of the catalytic oxidation bed 301 through a waste gas pipe provided with a temperature detector 205, the waste gas pipe between the catalytic fan 103 and the second regulating valve 203 is connected with the waste gas inlet end of the second heat exchanger 202 through a first overrunning pipeline, and a third regulating valve 204 is arranged on the first overrunning pipeline;
the air outlet end of the catalytic oxidation bed 301 is connected with the tail gas inlet end of the second heat exchanger 202 through a tail gas pipeline 401, the tail gas outlet end of the second heat exchanger 202 is connected with the tail gas inlet end of the first heat exchanger 201 through a tail gas pipeline, and the tail gas outlet end of the first heat exchanger 201 is connected with the flue 402 through a tail gas pipeline.
The combustible gas detector 107 is interlocked with the first regulating valve 106 and is connected with the PLC controller; the PLC controller is used for executing the following steps:
s1: obtaining the concentration of the combustible gas;
s2: judging whether the concentration of the combustible gas exceeds a preset concentration value,
s3: when the concentration detection data of the combustible gas exceed the concentration preset value, the opening degree of the first regulating valve is increased; otherwise, the opening degree of the first regulating valve is reduced.
When the concentration of the combustible gas exceeds a preset concentration value, the opening degree of the first regulating valve is increased, and the fresh air volume entering the heat exchange and catalytic oxidation system is increased, so that the concentration of the combustible gas entering the system is reduced; avoid the burning explosion condition of the later waste gas in the heat exchange and heating process. And when the concentration of the combustible gas is lower than the concentration preset value, the opening degree of the first regulating valve is reduced, and the fresh air quantity entering the waste gas pipe is reduced, so that more waste gas enters the system for catalytic oxidation, and the system efficiency is improved.
Wherein the concentration of the combustible gas is preset to be 75% of the lower explosion limit of the combustible gas.
In this embodiment, the combustible gas includes aromatic hydrocarbons (toluene, xylene, ethylbenzene, etc.), esters, alcohols, and gasoline.
The second regulating valve 203 and the third regulating valve 204 are interlocked with the temperature detector 205 and are connected with the PLC controller. The PLC controller is used for executing the following steps:
s1, acquiring the inlet air temperature of the catalytic oxidation bed;
s2: judging whether the inlet air temperature of the catalytic oxidation bed exceeds a preset temperature value,
s3: when the inlet air temperature of the catalytic oxidation bed exceeds a preset temperature value, the opening degree of the second regulating valve is reduced, and the opening degree of the third regulating valve is increased; otherwise, the opening degree of the second regulating valve is increased, and the opening degree of the third regulating valve is reduced.
When the inlet air temperature of the catalytic oxidation bed exceeds the preset temperature value, because the opening degree of the second regulating valve is reduced, the amount of waste gas subjected to twice temperature rise through the first heat exchanger and the second heat exchanger is reduced, and the amount of waste gas directly subjected to once temperature rise through the second heat exchanger is increased, so that the inlet air temperature of the catalytic oxidation bed is reduced;
when the inlet air temperature of the catalytic oxidation bed is lower than the preset temperature value, the opening degree of the second regulating valve is increased, so that the amount of the waste gas which is subjected to temperature rise twice through the first heat exchanger and the second heat exchanger is increased, and the amount of the waste gas which is directly subjected to temperature rise once through the second heat exchanger is reduced, so that the inlet air temperature of the catalytic oxidation bed is increased. The problem that the catalytic effect is influenced or potential safety hazards are caused by overhigh or overlow temperature of the waste gas entering the catalytic oxidation bed is avoided.
The opening degrees of the first regulating valve 106, the second regulating valve 203 and the third regulating valve 204 are 0-90 degrees.
The catalytic oxidation bed 301 is provided with an auxiliary heating system which is interlocked with the temperature detector 205 and is connected with the PLC controller. The PLC controller is used for executing the following steps:
s1: acquiring the inlet air temperature of the catalytic oxidation bed;
s2: judging whether the inlet air temperature of the catalytic oxidation bed exceeds a preset temperature value,
s3: when the inlet air temperature of the catalytic oxidation bed exceeds a preset temperature value, reducing the heat supply of the auxiliary heating system; otherwise, the heat supply of the auxiliary heating system is improved.
The auxiliary heating system of the catalytic oxidation bed is used as a heat source of the catalytic oxidation bed in the starting-up stage or when the concentration of waste gas is low. The auxiliary heating device may be a light natural gas burner system, a light diesel burner system, electrical heating, or the like.
An exhaust pipe between the combustible gas detector 107 and the first cut-off valve 105 is connected with the flue 402 through a second overtaking pipeline, and the second overtaking pipeline is provided with a second cut-off valve 104. When the system is not maintained or for other reasons, the second cut-off valve is opened, the first cut-off valve is closed, and the organic waste gas is discharged from the flue by the second surpassing pipeline.
The first heat exchanger 201 and the second heat exchanger 202 are tube type heat exchangers or plate type heat exchangers. In this embodiment, the first heat exchanger is a shell and tube heat exchanger, and the second heat exchanger is a plate heat exchanger.
In the implementation of the invention, the following processes are included:
1) preheating: before introducing the organic waste gas, preheating the catalytic oxidation bed by an auxiliary heating system.
2) And (3) an exhaust gas oxidation process: the waste gas to be treated after heat exchange enters a catalyst bed layer, and is oxidized and decomposed into CO by lower heat under the catalytic action of a catalyst2、H2O。
3) The heat exchange process comprises the following steps: the waste gas to be treated is used as a refrigerant to exchange heat through the first heat exchanger and the second heat exchanger or directly exchanges heat through the second heat exchanger and then enters the catalytic oxidation bed, and the high-temperature purified tail gas is used as a heating medium to exchange heat through the first heat exchanger and the second heat exchanger and then is discharged at a low temperature.
It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.
Claims (5)
1. A catalytic oxidation apparatus for exhaust gases of VOCs, comprising: the device comprises an exhaust gas pipe, a flame arrester, a catalytic fan, a first heat exchanger, a second heat exchanger, a catalytic oxidation bed, an exhaust gas pipeline and a flue, wherein an exhaust gas channel and an exhaust gas channel are arranged in the first heat exchanger and the second heat exchanger;
a combustible gas detector and a first cut-off valve are sequentially arranged between the gas inlet end of the waste gas pipe and the flame arrester, the flame arrester is connected with the catalytic fan through the waste gas pipe connected with a fresh air pipe, a first regulating valve is arranged on the fresh air pipe, the catalytic fan is connected with the waste gas inlet end of a first heat exchanger through the waste gas pipe provided with a second regulating valve, the waste gas outlet end of the first heat exchanger is connected with the waste gas inlet end of a second heat exchanger through the waste gas pipe, the second heat exchanger is connected with the gas inlet end of the catalytic oxidation bed through the waste gas pipe provided with a temperature detector, the waste gas pipe between the catalytic fan and the second regulating valve is connected with the waste gas inlet end of the second heat exchanger through a first overrunning pipeline, and a third regulating valve is arranged on the first overrunning pipeline;
the air outlet end of the catalytic oxidation bed is connected with the tail gas inlet end of a second heat exchanger through a tail gas pipeline, the tail gas outlet end of the second heat exchanger is connected with the tail gas inlet end of a first heat exchanger through a tail gas pipeline, and the tail gas outlet end of the first heat exchanger is connected with a flue through a tail gas pipeline;
the combustible gas detector is interlocked with the first regulating valve and is connected with the PLC; and the second regulating valve and the third regulating valve are interlocked with the temperature detector and are connected with the PLC.
2. The catalytic oxidation apparatus for the exhaust gas of VOCs according to claim 1, wherein said catalytic oxidation bed is provided with an auxiliary heating system interlocked with a temperature detector and connected with a PLC controller.
3. The catalytic oxidation apparatus for waste gases of VOCs according to claim 1, wherein the waste gas pipe between the flammable gas detector and the first cut-off valve is connected to the flue through a second overtaking pipe, and the second overtaking pipe is provided with a second cut-off valve.
4. The catalytic oxidation apparatus for exhaust gases of VOCs according to claim 1, wherein the first, second, and third regulating valves are opened at 0 to 90 °.
5. The catalytic oxidation apparatus for waste gases of VOCs according to claim 1, wherein said first and second heat exchangers are tube heat exchangers or plate heat exchangers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922485043.4U CN211753940U (en) | 2019-12-31 | 2019-12-31 | VOCs waste gas catalytic oxidation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922485043.4U CN211753940U (en) | 2019-12-31 | 2019-12-31 | VOCs waste gas catalytic oxidation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211753940U true CN211753940U (en) | 2020-10-27 |
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ID=72890453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922485043.4U Active CN211753940U (en) | 2019-12-31 | 2019-12-31 | VOCs waste gas catalytic oxidation equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211753940U (en) |
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2019
- 2019-12-31 CN CN201922485043.4U patent/CN211753940U/en active Active
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