CN216171086U - VOCs tail gas treatment device - Google Patents
VOCs tail gas treatment device Download PDFInfo
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- CN216171086U CN216171086U CN202122422709.9U CN202122422709U CN216171086U CN 216171086 U CN216171086 U CN 216171086U CN 202122422709 U CN202122422709 U CN 202122422709U CN 216171086 U CN216171086 U CN 216171086U
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Abstract
The utility model relates to the technical field of tail gas treatment, in particular to a VOCs tail gas treatment device, which comprises a wind mixing box, a pretreatment device, a main fan, a regenerative oxidation furnace, a cooling tower, an alkaline washing tower and an induced draft fan, wherein the wind mixing box, the pretreatment device, the main fan, the regenerative oxidation furnace, the cooling tower, the alkaline washing tower and the induced draft fan are sequentially communicated; the device also comprises a chimney, a back-blowing fan and a controller, wherein the induced draft fan is respectively communicated with the standard gas inlet of the air mixing box, the chimney and the back-blowing fan, and the back-blowing fan is communicated with the regenerative oxidation furnace; be equipped with VOCs tail gas air intake and the gaseous air intake of up to standard on the case that mixes, be equipped with VOCs tail gas fan on the VOCs tail gas air intake, be equipped with the gaseous fan of up to standard on the gaseous air intake of up to standard, be equipped with explosion limit detector in the case that mixes, VOCs tail gas fan, the gaseous fan of up to standard and explosion limit detector are connected with the controller electricity respectively. And a part of treated standard gas is utilized to dilute the VOCs tail gas, so that the content of inflammable and explosive gases in the tail gas to be treated is reduced, external fresh air is prevented from being introduced, and finally the gas emission is not increased.
Description
Technical Field
The utility model relates to the technical field of tail gas treatment, in particular to a VOCs tail gas treatment device.
Background
VOCs (Volatile Organic Compounds, called as Volatile Organic Compounds throughout the English) generally exist in the chemical production process, and the waste gas of the VOCs has strong volatility, diffusivity and chemical toxicity, and has large discharge amount, multiple types, difficult degradation, strong toxicity and large potential safety hazard in the production process, thereby seriously polluting the environment and threatening the health of people.
Conventional treatment of VOCs includes absorption, oxidation, combustion, photolysis, etc., and specific treatment methods include catalytic combustion, activated carbon adsorption, low-temperature plasma, ultraviolet irradiation, etc. The above-mentioned treatment method has a superior characteristic to the conventional treatment of low-concentration VOCs, but has an irreparable disadvantage in the treatment of some high-concentration VOCs tail gas containing flammable and explosive gas components, such as hydrogen.
To high concentration VOCs tail gas treatment, traditional method treatment effeciency is low, handles to have the limitation, and the processing mode can not obtain the safety guarantee, can not reach emission standard after handling, causes the not enough of the great degree of difficulty of the processing of this type of tail gas, necessarily provides a device that can handle different concentration, different component VOCs tail gas.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems that the treatment efficiency is low and the treatment is not suitable for treating the VOCs tail gas containing inflammable and explosive gases when the high-concentration VOCs tail gas is treated by the conventional VOCs treatment method, the utility model provides the VOCs tail gas treatment device, and the treatment device utilizes part of treated standard gas to dilute the untreated VOCs tail gas, so that the content of inflammable and explosive gases in the mixed tail gas to be treated is reduced, and the safety of subsequent treatment processes, particularly combustion processes, is ensured; the high-concentration VOCs tail gas can be effectively treated by adopting a combustion mode, the tail gas after combustion can be directly discharged after being cooled and alkali-washed, and also can be reused in the system as diluent gas and a back flushing system, so that the introduction of external fresh air is avoided, and finally, the gas discharge amount cannot be increased.
A VOCs tail gas treatment device comprises a wind mixing box, a pretreatment device, a main fan, a regenerative oxidation furnace, a cooling tower, an alkaline washing tower and an induced draft fan which are sequentially communicated;
the system also comprises a chimney and a back-blowing fan, wherein the induced draft fan is respectively communicated with the standard gas inlet of the air mixing box, the chimney and the back-blowing fan, and the back-blowing fan is communicated with the regenerative oxidation furnace;
still include the controller, be equipped with VOCs tail gas air intake and standard gas air intake on the wind mixing box, be equipped with VOCs tail gas fan on the VOCs tail gas air intake, be equipped with standard gas fan on the standard gas air intake, be equipped with the explosion limit detector in the wind mixing box, VOCs tail gas fan, standard gas fan and explosion limit detector are connected with the controller electricity respectively.
Furthermore, the pretreatment device comprises a water washing tower and a filtering device which are communicated in sequence.
Furthermore, the water scrubber is a spray tower with a third-level spray device, and spray water of the third-level spray device is in reverse contact with tail gas. The dust, water-soluble salt, water-soluble organic matters, tar and other components in the tail gas can be removed in the water washing process.
Further, the filtering device is a filtering cloth with the aperture of 15 μm, 9 μm and 3 μm in sequence. The tail gas to be treated is filtered by adopting a graded filtering device with the aperture of the filter cloth decreasing from 15 mu m to 3 mu m, and particulate matters in the tail gas to be treated can be fully removed.
Further, the device also comprises a high-temperature air mixing box, the regenerative oxidation furnace is communicated with the high-temperature air mixing box, and the high-temperature air mixing box is communicated with the cooling tower. After combustion, tail gas is firstly collected in a high-temperature air mixing box and then is introduced into a cooling tower for cooling.
Further, the regenerative oxidation furnace is a three-tower regenerative oxidation furnace.
Further, the alkaline washing tower is a spray tower with a three-stage spray device.
The beneficial effect of the utility model is that,
according to the VOCs tail gas treatment device provided by the utility model, the untreated VOCs tail gas is diluted by the treated standard gas, so that the content of inflammable and explosive gases in the tail gas to be treated is reduced to a safe range, the safety of subsequent combustion treatment is ensured, the standard gas is also used for reversely blowing the regenerative oxidation furnace, the standard gas is used in the mode, fresh air is not supplemented into the system, and the final gas emission amount is not increased due to dilution. The utility model has good treatment effect on the VOCs tail gas, can be used for treating the VOCs tail gas containing other flammable and explosive gases, has treatment capacity on the gas with low VOCs content, and is not limited by the components and concentration of the tail gas.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view showing the connection of processing apparatuses according to embodiment 1.
Fig. 2 is a schematic diagram of an electrical connection relationship among the controller, the VOCs tail gas fan, the standard gas fan, and the explosion limit detector in the processing apparatus of embodiment 1.
In the figure, 1-air mixing box, 2-water scrubber, 3-filter device, 4-main blower, 5-regenerative oxidation furnace, 6-high temperature air mixing box, 7-cooling tower, 8-alkaline scrubber, 9-induced draft fan, 10-chimney, 11-back blower, 12-controller, 13-VOCs tail gas blower, 14-standard gas blower, and 15-explosion limit detector.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and 2, a treatment device for VOCs tail gas comprises a wind mixing box 1, a water scrubber 2, a filter device 3, a main fan 4, a heat accumulating type oxidation furnace 5, a high-temperature wind mixing box 6, a cooling tower 7, an alkaline tower 8 and an induced draft fan 9 which are sequentially communicated;
the device also comprises a chimney 10 and a back-blowing fan 11, wherein the induced draft fan 9 is respectively communicated with the standard gas inlet of the air mixing box 1, the chimney 10 and the back-blowing fan 11, and the back-blowing fan 11 is communicated with the regenerative oxidation furnace 5;
the device is characterized by further comprising a controller 12, wherein a VOCs tail gas air inlet and a standard gas air inlet are formed in the air mixing box 1, a VOCs tail gas fan 13 is arranged on the VOCs tail gas air inlet, a standard gas fan 14 is arranged on the standard gas air inlet, an explosion limit detector 15 is arranged in the air mixing box 1, and the VOCs tail gas fan 13, the standard gas fan 14 and the explosion limit detector 15 are respectively and electrically connected with the controller 12;
the water washing tower 2 is a spray tower with a three-stage spray device, and spray water of the three-stage spray device is in reverse contact with tail gas; the filtering device 3 is a filter cloth with the aperture of 15 mu m, 9 mu m and 3 mu m in sequence; the heat accumulating type oxidation furnace 5 is a three-tower heat accumulating type oxidation furnace; the alkaline washing tower 8 is a spray tower with a three-stage spray device.
The working principle of the utility model is as follows:
mixing untreated VOCs tail gas and part of treated standard-reaching gas to form tail gas to be treated, measuring the content of inflammable and explosive gas in the tail gas to be treated by using an explosion limit detector, regulating and controlling the frequency conversion of a fan of an air mixing box according to the measurement result of the explosion limit detector, and increasing the standard-reaching gas entering the air mixing box until the standard-reaching gas reaches the air mixing boxThe content of flammable and explosive gases in the tail gas to be treated is reduced to be below a set value, for example, below 25% of the lower explosion limit; then the mixed tail gas to be treated is firstly in reverse contact with three-stage spray water of a washing tower for washing, dust removal, water-soluble salt, water-soluble organic matters and tar are removed, then three-stage filtration is carried out, solid impurities in the tail gas are ensured to be free, after the pretreatment is finished, the tail gas to be treated enters a heat accumulating type oxidation furnace for combustion, the heat accumulating type oxidation furnace takes coal gas or natural gas as fuel, the temperature in the furnace is heated to over 800 ℃, VOCs components in the tail gas are oxidized and combusted in the heat accumulating type oxidation furnace and are converted into CO2And H2O; the tail gas after burning is firstly cooled through a cooling tower, in the process, waste heat can be recovered, for example, a lithium bromide unit is used for recovering the waste heat, cold energy is generated for workshop production and use, the cooled tail gas enters an alkaline washing tower, and a tertiary spraying device of the alkaline washing tower sprays SO in alkaline washing liquid with the pH value of 10-12 and the tail gas2And other acidic gases are subjected to alkaline cleaning to obtain standard-reaching gases, the standard-reaching gases are divided into three paths, one path of the standard-reaching gases is discharged through a chimney, the other path of the standard-reaching gases enters a regenerative oxidation furnace through a back-blowing fan, the unpurified tail gas in the heat accumulator is sent into a combustion chamber again, and the other path of the standard-reaching gases returns to a wind mixing box through a return pipeline to be used as dilution air to dilute the untreated VOCs tail gas.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (7)
1. A VOCs tail gas treatment device is characterized by comprising a wind mixing box (1), a pretreatment device, a main fan (4), a regenerative oxidation furnace (5), a cooling tower (7), an alkaline washing tower (8) and an induced draft fan (9) which are sequentially communicated;
the device is characterized by further comprising a chimney (10) and a back-blowing fan (11), wherein the induced-blowing fan (9) is respectively communicated with a standard gas inlet of the air mixing box (1), the chimney (10) and the back-blowing fan (11), and the back-blowing fan (11) is communicated with the heat accumulating type oxidation furnace (5);
still include controller (12), be equipped with VOCs tail gas air intake and up to standard gas air intake on mixing bellows (1), be equipped with VOCs tail gas fan (13) on the VOCs tail gas air intake, be equipped with up to standard gas fan (14) on the up to standard gas air intake, be equipped with explosion limit detector (15) in mixing bellows (1), VOCs tail gas fan (13), up to standard gas fan (14) and explosion limit detector (15) are connected with controller (12) electricity respectively.
2. The treatment plant according to claim 1, characterized in that it comprises a water washing column (2), a filtering device (3) in series communication.
3. The treatment plant according to claim 2, characterized in that the water scrubber (2) is a spray tower with a tertiary spray device, the spray water of which is in counter-current contact with the tail gas.
4. The treatment apparatus according to claim 2, wherein the filtration apparatus (3) is a filter cloth having a pore size of 15 μm, 9 μm and 3 μm in this order.
5. The processing apparatus according to claim 1, further comprising a high temperature air mixing box (6), wherein the regenerative oxidation furnace (5) is communicated with the high temperature air mixing box (6), and the high temperature air mixing box (6) is communicated with a cooling tower (7).
6. The treatment apparatus according to claim 1, wherein the regenerative oxidation furnace (5) is a three-tower regenerative oxidation furnace.
7. A treatment plant according to claim 1, characterized in that the caustic tower (8) is a spray tower with three stages of spraying.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122422709.9U CN216171086U (en) | 2021-10-08 | 2021-10-08 | VOCs tail gas treatment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122422709.9U CN216171086U (en) | 2021-10-08 | 2021-10-08 | VOCs tail gas treatment device |
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| CN216171086U true CN216171086U (en) | 2022-04-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113797697A (en) * | 2021-10-08 | 2021-12-17 | 金能科技股份有限公司 | VOCs tail gas treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113797697A (en) * | 2021-10-08 | 2021-12-17 | 金能科技股份有限公司 | VOCs tail gas treatment process |
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