CN212481334U - High concentration organic waste gas catalytic combustion processing system - Google Patents
High concentration organic waste gas catalytic combustion processing system Download PDFInfo
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- CN212481334U CN212481334U CN202020477322.6U CN202020477322U CN212481334U CN 212481334 U CN212481334 U CN 212481334U CN 202020477322 U CN202020477322 U CN 202020477322U CN 212481334 U CN212481334 U CN 212481334U
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Abstract
The utility model discloses a high concentration organic waste gas catalytic combustion processing system has such characteristic: comprises a first-stage heat exchanger, a heating chamber, a first-stage combustion chamber and an exhaust funnel; a heating heat exchange outlet of a primary heat exchanger cooling channel is communicated with a heating inlet of a heating chamber, a heating outlet of the heating chamber is communicated with a primary combustion inlet of a primary combustion chamber, a primary combustion outlet of the primary combustion chamber is communicated with a cooling heat exchange inlet of a primary heat exchanger heating channel, and a cooling heat exchange outlet of the primary heat exchanger heating channel is communicated with an exhaust funnel through a pipeline with a valve body; the system further comprises a secondary combustion chamber; the cooling heat exchange outlet of the heat supply channel of the primary heat exchanger is also communicated with the secondary combustion inlet of the secondary combustion chamber through a pipeline with a valve body, and the secondary combustion outlet of the secondary combustion chamber is communicated with the exhaust funnel through a pipeline with a valve body; the pipeline with the valve body controls whether the pipeline is a passage or not. The utility model has the advantages of can be according to nimble using of exhaust gas concentration.
Description
Technical Field
The utility model belongs to the exhaust-gas treatment field relates to a catalytic combustion processing system, especially relates to a high concentration organic waste gas catalytic combustion processing system.
Background
The catalytic combustion is widely applied to VOCs treatment due to low reaction temperature (generally about 250 ℃) and high purification efficiency (the highest purification efficiency can reach 98%). When the concentration of VOCs is higher, taking methanol as an example, when the concentration reaches 6000mg/m3However, below the lower explosion limit of 1/4, the purification efficiency of 98% still cannot ensure that the outlet concentration is below 120mg/m3Environmental requirements (most industries in the Tianjin landmark are below 50). If the intake air concentration is diluted, the catalytic combustion device cannot realize self-sustaining combustion, and the one-time investment and the operation energy consumption are both large. The conventional first-stage catalytic combustion has the upper limit that the purification efficiency reaches 98% due to the wall flow effect and uneven heating, and the purification efficiency cannot be further improved by reducing the space velocity and increasing the use amount of the catalyst.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high concentration organic waste gas catalytic combustion processing system, reaction heat when make full use of catalytic combustion handles high concentration VOCs adopts second grade catalytic combustion device to promote purification efficiency to more than 99%, and second grade catalysis adopts low temperature catalytic material, can utilize the reaction heat (heat transfer) of one-level catalysis, need not extra heat supply, has solved conventional one-level catalytic combustion device and has leaded to the purification efficiency bottleneck problem owing to be heated inequality and wall flow effect.
In order to achieve the above object, the present invention provides a high concentration organic waste gas catalytic combustion processing system, which has the following features: comprises a first-stage heat exchanger, a heating chamber, a first-stage combustion chamber and an exhaust funnel; a heating heat exchange outlet of a primary heat exchanger cooling channel is communicated with a heating inlet of a heating chamber, a heating outlet of the heating chamber is communicated with a primary combustion inlet of a primary combustion chamber, a primary combustion outlet of the primary combustion chamber is communicated with a cooling heat exchange inlet of a primary heat exchanger heating channel, and a cooling heat exchange outlet of the primary heat exchanger heating channel is communicated with an exhaust funnel through a pipeline with a valve body; the system further comprises a secondary combustion chamber; the cooling heat exchange outlet of the heat supply channel of the primary heat exchanger is also communicated with the secondary combustion inlet of the secondary combustion chamber through a pipeline with a valve body, and the secondary combustion outlet of the secondary combustion chamber is communicated with the exhaust funnel through a pipeline with a valve body; the pipeline with the valve body controls whether the pipeline is a passage or not.
Further, the utility model provides a high concentration organic waste gas catalytic combustion processing system can also have such characteristic: the device also comprises a secondary heat exchanger; the cooling heat exchange outlet of the heat supply channel of the primary heat exchanger is also communicated with the cooling heat exchange inlet of the heat supply channel of the secondary heat exchanger through a pipeline with a valve body, and the cooling heat exchange outlet of the heat supply channel of the secondary heat exchanger is communicated with the secondary combustion inlet of the secondary combustion chamber;
further, the utility model provides a high concentration organic waste gas catalytic combustion processing system can also have such characteristic: wherein, the cooling channel of the secondary heat exchanger is communicated with the cooling medium storage device.
Further, the utility model provides a high concentration organic waste gas catalytic combustion processing system can also have such characteristic: the device also comprises a waste gas collecting device, a pretreatment device and an exhaust fan; the waste gas collecting device is communicated with the pretreatment device, and the pretreatment device is communicated with a heating heat exchange inlet of a primary heat exchanger cooling channel through an exhaust fan.
The beneficial effects of the utility model reside in that:
firstly, a two-stage series connection mode of high-temperature catalytic combustion and low-temperature catalytic combustion is adopted, so that the wall flow effect is avoided, and the purification efficiency is improved;
the second-stage low-temperature catalytic combustion device does not need to be heated, and utilizes the reaction heat of the first-stage catalysis;
thirdly, the first-stage heat exchanger is fully utilized to ensure that the waste gas is uniformly heated and mixed, and the wall flow effect is further reduced;
fourthly, the catalytic combustion stage number and the heat exchanger stage number can be adjusted by controlling a valve body of the connecting pipeline, and the waste heat of the tail gas is fully utilized; the opening of the secondary heat exchanger can avoid irreversible efficiency reduction of low-temperature catalysis due to the gradual agglomeration of noble metals caused by overhigh temperature; when the secondary catalytic device is subjected to transient inactivation, the secondary heat exchanger is closed, and the secondary catalyst can be regenerated by utilizing the high temperature of the gas.
Drawings
FIG. 1 is a schematic diagram of a high-concentration organic exhaust gas catalytic combustion treatment system.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the utility model provides a high concentration organic waste gas catalytic combustion processing system, including exhaust gas collecting device 1, preprocessing device 2, exhaust fan 3, one-level heat exchanger 4, heating chamber 5, one-level combustion chamber 6, aiutage 7, second grade heat exchanger 8 and second grade combustion chamber 9.
The waste gas collecting device 1 is communicated with the pretreatment device 2, and the pretreatment device 2 is communicated with a heating heat exchange inlet of a cooling channel of the primary heat exchanger 4 through an exhaust fan 3.
The heating heat exchange outlet of the cooling channel of the first-level heat exchanger 4 is communicated with the heating inlet of the heating chamber 5, the heating outlet of the heating chamber 5 is communicated with the first-level combustion inlet of the first-level combustion chamber 6, the first-level combustion outlet of the first-level combustion chamber 6 is communicated with the cooling heat exchange inlet of the heating channel of the first-level heat exchanger 4, and the cooling heat exchange outlet of the heating channel of the first-level heat exchanger 4 is communicated with the exhaust funnel 7 through a pipeline with a valve body.
Wherein, the cooling channel and the heating channel of the primary heat exchanger 4 refer to two channels for mutual heat exchange, the low-temperature gas entering the cooling channel is heated by the high-temperature gas entering the heating channel, and the high-temperature gas entering the heating channel is cooled by the low-temperature gas entering the cooling channel, and both are the existing heat exchanger structures.
The cooling heat exchange outlet of the heat supply channel of the primary heat exchanger 4 is also communicated with the secondary combustion inlet of the secondary combustion chamber 9 through a pipeline with a valve body, and the secondary combustion outlet of the secondary combustion chamber 9 is communicated with the exhaust funnel 7 through a pipeline with a valve body.
The cooling heat exchange outlet of the heat supply channel of the primary heat exchanger 4 is also communicated with the cooling heat exchange inlet of the heat supply channel of the secondary heat exchanger 8 through a pipeline with a valve body, and the cooling heat exchange outlet of the heat supply channel of the secondary heat exchanger 8 is communicated with the secondary combustion inlet of the secondary combustion chamber 9.
The cooling channel of the secondary heat exchanger 8 is communicated with the cooling medium storage device, namely, the secondary heat exchanger 8 cools the waste gas entering from the primary heat exchanger 4 through other cooling media.
For a pipe with a valve body, the valve body controls whether the pipe is a passage.
The waste gas treatment method of the system comprises the following steps:
after VOCs are collected, the humidity, acid-base waste gas and particulate matters are removed through the pretreatment device 2, and high humidity and particulate matters (less than 10 mg/m) are avoided3) And sulfur, phosphorus, lead, and halogens, etc., cause temporary and permanent deactivation of the catalyst. Depending on the concentration of the exhaust gas, the system has three treatment routes:
firstly, the concentration of VOCs is less than 2500mg/m3When activated, the primary combustion chamber 6 is activated. At this time, the connecting pipeline between the primary heat exchanger 4 and the exhaust funnel 7 is opened and communicated through the valve body thereof, the connecting pipeline between the primary heat exchanger 4 and the secondary combustion chamber 9 is closed through the valve body thereof, and the connecting pipeline between the primary heat exchanger 4 and the secondary heat exchanger 8 is closed through the valve body thereof. The treatment process comprises the following steps: the pretreated VOCs are heated through the primary heat exchanger 4, then enter the heating chamber 5 to be heated to the effective catalysis temperature of the catalyst, and then enter the primary combustion chamber 6 to be effectively decomposed, the heat of the decomposed high-temperature tail gas is preheated through the primary heat exchanger 4 to enter the air, and the tail gas after heat exchange enters the exhaust funnel 7 to be discharged.
Secondly, the concentration of VOCs is 2500-3When activated, the secondary combustor 9 is activated, but the secondary heat exchanger 8 is not activated. At the moment, a connecting pipeline between the primary heat exchanger 4 and the exhaust funnel 7 is closed through a valve body of the connecting pipeline, the connecting pipeline between the primary heat exchanger 4 and the secondary combustion chamber 9 is opened and communicated through the valve body of the connecting pipeline, the connecting pipeline between the secondary combustion chamber 9 and the exhaust funnel 7 is opened and communicated through the valve body of the connecting pipeline, and the connecting pipeline between the primary heat exchanger 4 and the secondary heat exchanger 8 is closed through the valve body of the connecting pipeline. The treatment process comprises the following steps: through a first stageThe gas decomposed by the combustion chamber 6 and subjected to heat exchange and temperature reduction by the primary heat exchanger 4 enters the secondary combustion chamber 9 to be continuously decomposed, and the decomposed tail gas enters the exhaust funnel 7 to be discharged.
Thirdly, the concentration of VOCs is more than 4000mg/m3During the process, the temperature of the VOCs with high concentration can be further increased due to the reaction heat generated by catalytic combustion, the VOCs enters the secondary combustion chamber after two-stage heat exchange for secondary treatment and then is discharged, namely, the secondary combustion chamber 9 is started and the secondary heat exchanger 8 is started at the same time. At this time, the connecting pipeline between the primary heat exchanger 4 and the exhaust funnel 7 is closed through a valve body thereof, the connecting pipeline between the primary heat exchanger 4 and the secondary combustion chamber 9 is closed through a valve body thereof, the connecting pipeline between the primary heat exchanger 4 and the secondary heat exchanger 8 is opened and communicated through a valve body thereof, and the connecting pipeline between the secondary combustion chamber 9 and the exhaust funnel 7 is opened and communicated through a valve body thereof. The treatment process comprises the following steps: the gas decomposed by the primary combustion chamber 6 and heat-exchanged and cooled by the primary heat exchanger 4 enters the secondary heat exchanger 8 to be continuously cooled, then enters the secondary combustion chamber 9 to be secondarily decomposed, and the decomposed tail gas enters the exhaust funnel 7 to be discharged.
In this embodiment, taking the treatment of methanol as an example, when an enterprise oven dries a methanol-containing solvent, the exhaust gas concentration is less than 2500, 2500-4000 and > 4000mg/m according to the production stage3The effective catalytic temperature of the catalyst in the first-stage combustion chamber 6 is 250 ℃, the effective catalytic temperature of the catalyst in the second-stage combustion chamber 9 is 155 ℃, the first-stage purification efficiency is 98 percent, the second-stage purification efficiency is 90 percent, the comprehensive purification efficiency can reach 99.7 percent, and the air inlet concentration is lower than 15000mg/m3Exhaust gas concentration is less than 50mg/m3And can meet strict local standards in various places.
Claims (4)
1. A high concentration organic waste gas catalytic combustion processing system which characterized in that:
comprises a first-stage heat exchanger, a heating chamber, a first-stage combustion chamber and an exhaust funnel;
a heating heat exchange outlet of a primary heat exchanger cooling channel is communicated with a heating inlet of a heating chamber, a heating outlet of the heating chamber is communicated with a primary combustion inlet of a primary combustion chamber, a primary combustion outlet of the primary combustion chamber is communicated with a cooling heat exchange inlet of a primary heat exchanger heating channel, and a cooling heat exchange outlet of the primary heat exchanger heating channel is communicated with an exhaust funnel through a pipeline with a valve body;
the system further comprises a secondary combustion chamber;
a cooling heat exchange outlet of a heat supply channel of the primary heat exchanger is also communicated with a secondary combustion inlet of the secondary combustion chamber through a pipeline with a valve body, and a secondary combustion outlet of the secondary combustion chamber is communicated with an exhaust funnel through a pipeline with a valve body;
the valve body controls whether the pipeline is a passage or not.
2. The high concentration organic exhaust gas catalytic combustion processing system according to claim 1, characterized in that:
the device also comprises a secondary heat exchanger;
and the cooling heat exchange outlet of the heat supply channel of the primary heat exchanger is also communicated with the cooling heat exchange inlet of the heat supply channel of the secondary heat exchanger through a pipeline with a valve body, and the cooling heat exchange outlet of the heat supply channel of the secondary heat exchanger is communicated with the secondary combustion inlet of the secondary combustion chamber.
3. The high concentration organic exhaust gas catalytic combustion processing system according to claim 2, characterized in that:
wherein, the cooling channel of the secondary heat exchanger is communicated with the cooling medium storage device.
4. The high concentration organic exhaust gas catalytic combustion processing system according to claim 1, characterized in that:
the device also comprises a waste gas collecting device, a pretreatment device and an exhaust fan;
the waste gas collecting device is communicated with the pretreatment device, and the pretreatment device is communicated with the heating heat exchange inlet of the primary heat exchanger cooling channel through an exhaust fan.
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| CN202020477322.6U CN212481334U (en) | 2020-04-03 | 2020-04-03 | High concentration organic waste gas catalytic combustion processing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115040969A (en) * | 2022-06-07 | 2022-09-13 | 安徽紫科环保科技有限公司 | Automobile drying waste gas treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115040969A (en) * | 2022-06-07 | 2022-09-13 | 安徽紫科环保科技有限公司 | Automobile drying waste gas treatment device |
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