JP6367454B1 - Exhaust gas treatment system - Google Patents

Abstract

An exhaust gas treatment system capable of further improving VOC removal efficiency is provided.
An exhaust gas treatment system 90 for treating an organic component contained in exhaust gas, further comprising: a combustion treatment device 2 for subjecting the exhaust gas to combustion treatment; and an organic component remaining in the treated gas treated by the combustion treatment device 2 And an organic component removing device 30 to be removed.
[Selection] Figure 5

Description

  The present invention relates to an exhaust gas treatment system for treating exhaust gas containing an organic component.

  Exhaust gas containing organic components (hereinafter referred to as “VOC”) discharged from paint factories and the like is heated by a combustion treatment device such as a regenerative thermal odorizer (hereinafter referred to as “RTO”). Decomposed. Basically, since VOC is an organic gas, it self-combusts. However, depending on the operation state of the factory, the VOC concentration in the exhaust gas becomes small, and self-combustion may become difficult. In such a case, it is conceivable to reheat with a burner. However, in order to reduce burner fuel due to reheating, as shown in Patent Document 1, VOC in exhaust gas is adsorbed on an adsorbent, and VOC is absorbed. A concentrating device for concentrating is arranged on the exhaust gas upstream side of the RTO.

JP 2011-72896 A

  Here, in recent years, in exhaust gas regulations, it is required to further improve the VOC removal efficiency in exhaust gas discharged to the outside air.

  Accordingly, an object of the present invention is to provide an exhaust gas treatment system that can further improve the VOC removal efficiency.

The present invention
An exhaust gas treatment system for treating organic components contained in exhaust gas,
A combustion treatment apparatus for combustion treatment of exhaust gas;
And an organic component removing device that further removes an organic component remaining in the treated gas treated by the combustion treatment device.

  According to the said structure, since an organic component can be further removed from the processed gas processed with the combustion processing apparatus, the removal efficiency of the organic component contained in the gas discharged | emitted from an organic component removal apparatus can be improved.

  The present invention preferably further comprises the following configuration.

(1) The said organic component removal apparatus is a downstream concentration apparatus which concentrates the processed gas processed with the said combustion processing apparatus.
(2) In the configuration (1), the downstream concentrator includes an adsorbent that adsorbs an organic component,
An adsorbing part through which the treated gas passes and adsorbs organic components contained in the treated gas;
A regeneration unit that is supplied with a high-temperature regeneration gas and desorbs the adsorbed organic component to generate a concentrated gas containing the organic component,
A cooling section in which cool air is supplied and a portion of the adsorbent heated by the high temperature regeneration gas is cooled;
To move sequentially,
The concentrated gas is supplied to the combustion processing apparatus.
(3) In the configuration (1) or (2), outside air is used as the cold air,
Cold air exchanged with the adsorbent part heated in the cooling section of the downstream concentrator is used as a regeneration gas supplied to the regeneration section of the downstream concentrator.
(4) In any one of the configurations (1) to (3), an upstream side concentration device is provided on the exhaust gas upstream side of the combustion treatment device,
The exhaust gas concentrated by the upstream concentrator is supplied to the downstream concentrator.
(5) In the configuration (4), the upstream concentrator includes an adsorbent that adsorbs an organic component.
An adsorbing part through which exhaust gas passes and adsorbs organic components contained in the exhaust gas,
A regeneration unit that is supplied with a high-temperature regeneration gas and desorbs the adsorbed organic component to generate a concentrated gas containing the organic component,
A cooling section in which cool air is supplied and a portion of the adsorbent heated by the high temperature regeneration gas is cooled;
To move sequentially,
Cold air exchanged with the adsorbent part heated in the cooling section of the upstream concentrator is used as a regeneration gas supplied to the regeneration section of the upstream concentrator.

  According to the configuration (1), by using the downstream concentration device as the organic component removing device, the removed organic component can be burned again by the combustion processing device, and energy saving is possible.

  According to the configuration (2), the concentrated gas generated in the downstream concentrating device is further combusted in the combustion processing device, thereby further improving the removal efficiency of organic components contained in the gas discharged to the outside. be able to.

  According to the configuration (3), since the outside air is used for cooling the adsorbent, organic components are not adsorbed on the adsorbent even when the adsorbent is cooled, and the adsorption efficiency of the adsorbent is sufficiently recovered. be able to. Moreover, since the performance of the heating means for the regeneration gas can be suppressed, the thermal efficiency of the system can be improved.

  According to the configuration (4), since the exhaust gas from the upstream concentrator disposed on the upstream side of the exhaust gas of the combustion treatment device has been conventionally released to the atmosphere, the organic component can be removed by adopting the above configuration. An exhaust gas treatment system with further improved efficiency can be provided.

  According to the configuration (5), since the performance of the heating means for the regeneration gas can be suppressed, the thermal efficiency of the system can be improved.

  According to the present invention, an exhaust gas treatment system that can further improve the VOC removal efficiency can be provided.

1 is a schematic view of an exhaust gas treatment system according to an embodiment of the present invention. It is a schematic perspective view of a downstream concentration apparatus. It is a schematic perspective view of an adsorption body. It is a schematic sectional drawing of a casing. It is the schematic of the exhaust gas processing system which concerns on another embodiment. It is the schematic of the exhaust gas processing system which concerns on another embodiment. It is the schematic of the exhaust gas processing system which has arrange | positioned the concentration apparatus based on another embodiment in series.

  FIG. 1 is a schematic diagram of an exhaust gas treatment system according to an embodiment of the present invention. As shown in FIG. 1, the exhaust gas treatment system 90 includes a combustion treatment device 2 that combusts exhaust gas, and an organic component that removes organic components of the treated gas treated by the combustion treatment device 2 by an action such as adsorption and decomposition. And a component removing device 30. In addition, as the organic component removing device 30, there are devices that adsorb organic components with activated carbon or the like, or decompose them with a catalyst, a combustion reaction, or the like. It shows what is condensed and discharged after adsorption.

  The combustion treatment apparatus 2 is an RTO, and includes a combustion chamber 22 having combustion means 21 such as a burner, at least two (three in FIG. 1) heat storage chambers 23 having one end communicating with the combustion chamber 22, and a heat storage chamber. And a switching device 24 such as an electric valve for alternately supplying exhaust gas to one of the heat storage chambers 23 and discharging the treated gas from the other heat storage chambers 23. ing.

  The exhaust gas discharged from the painting factory or the like is supplied from the supply fan 25 to one of the heat storage chambers 23 via the switching device 24. The exhaust gas is heated by exchanging heat with the heat storage body 26 of the heat storage chamber 23 and reaches the combustion chamber 22. The exhaust gas sent to the combustion chamber 22 is combusted by the combustion means 21. Specifically, VOC in the exhaust gas is detoxified by a combustion reaction. Then, the treated gas that has been subjected to the combustion process passes through another heat storage chamber 23 and is cooled by exchanging heat with the heat storage body 26 of the heat storage chamber 23, and is sent to the downstream concentration device 3 via the switching device 24. .

  FIG. 2 is a schematic perspective view of the downstream concentration device 3. As shown in FIG. 2, the downstream concentration device 3 includes an adsorbent 31 and a casing 10. FIG. 3 is a schematic perspective view of the adsorbent 31, and FIG. 4 is a schematic cross-sectional view of the casing 10. As shown in FIGS. 2 to 4, the adsorbent 31 is rotated at a constant speed or intermittently about the axis S by the driving means, and is composed of a metal rotor body 32 and a honeycomb body 33. And have. The rotor body 32 includes an inner cylinder 321 fixed to the shaft S, and an outer cylinder 323 disposed concentrically on the outer side of the inner cylinder 321 via ribs 322, and the inner cylinder 321, the outer cylinder 323, An adsorbent made of hydrophobic zeolite is processed into a honeycomb shape in a space formed between the two and a honeycomb body 33 having a large number of passages P in the axial direction is incorporated.

  The casing 10 is fixed to a base or the like, and has a cup-shaped first casing 10A and a second casing 10B through which the shaft S passes, and the adsorbent 31 by the first casing 10A and the second casing 10B. The both end surfaces of are covered.

  Inside the first casing 10A, three regions are formed by three partition plates 11, the first partition chamber having a large volume is a treated gas supply unit 12A, the second partition chamber is a concentrated gas exhaust unit 12B, and a third chamber. The compartment constitutes a cooling gas supply unit 12C.

  On the other hand, the second casing 10B is also provided with first to third compartments corresponding to the compartments of the first casing 10A. The first compartment is a purified gas exhaust part 13A, and the second compartment is a regeneration gas supply. The part 13B and the third compartment constitute a cooling gas exhaust part 13C.

  The end surface of the adsorbent 31 has an adsorbing portion at the portion of the honeycomb body 33 facing the treated gas supply portion 12A, a regeneration portion, and a cooling gas supply portion at the portion of the honeycomb body 33 facing the regeneration gas supply portion 13B. The portion of the honeycomb body 33 facing 12C serves as a cooling unit, and the honeycomb body 33 sequentially moves through the adsorption unit, the regeneration unit, and the cooling unit by the rotation of the adsorption body 31.

  Hydrophobic zeolite has a property of exhibiting adsorption ability at a low temperature (50 ° C. or lower) and desorbing an adsorbed substance when the temperature rises (100 to 200 ° C.).

  Therefore, the treated gas burned by the combustion treatment apparatus 2 passes through the honeycomb body 33 of the adsorbent 31 from the treated gas supply unit 12A, whereby the organic components in the treated gas are adsorbed and removed. The purified gas from which is removed is discharged to the outside air from the purified gas exhaust part 13A through the exhaust pipe 4.

  As the adsorbent 31 rotates, the portion of the honeycomb body 33 adsorbing the organic components moves to the regeneration gas supply unit 13B adjacent to the purified gas exhaust unit 13A. In the regeneration gas supply unit 13B, the organic component adsorbed on the honeycomb body 33 is desorbed by the high temperature regeneration gas (180 to 200 ° C.) having a smaller air volume than the volume of the treated gas heated by the heater 5, and the concentrated gas. Is generated.

  As the adsorbent 31 rotates, the honeycomb body 33 that has become high temperature due to the supply of the regeneration gas is cooled by the cooling gas supplied from the cooling gas supply unit 12C adjacent to the concentrated gas exhaust unit 12B, Restores adsorption capacity.

  According to the exhaust gas treatment system 90 configured as described above, the following effects can be exhibited.

  Since the organic component can be further removed by the downstream concentrating device 3 from the treated gas processed by the combustion processing device 2, the removal efficiency of the organic component contained in the gas discharged from the downstream concentrating device 3 can be further improved. .

(Another embodiment 1)
In addition to the above embodiment, outside air may be used as the cooling gas for the downstream concentrating device 3, and the concentrated gas generated by the downstream concentrating device 3 may be processed by the combustion processing device 2.

  FIG. 5 shows another embodiment 1 according to the present invention, in which outside air is used as a cooling gas for the downstream concentration device 3, and the outside air flows from the filter 14 through the junction X by the suction force of the supply fan 25. The concentrated gas produced | generated by the downstream concentration apparatus 3 is the schematic of the exhaust gas processing system processed with the combustion processing apparatus 2. FIG. Another embodiment differs from the above embodiment in that outside air is used as a cooling gas for the downstream concentrator 3, and the concentrated gas generated by the downstream concentrator 3 is processed by the combustion processor 2. Other configurations are the same as those in the above embodiment. For this reason, in description of another embodiment, the same code | symbol is attached | subjected to the same part as the said embodiment, and detailed description is abbreviate | omitted about those content.

  As shown in FIG. 5, the honeycomb body 33 that has become high temperature due to the supply of the regeneration gas is cooled by the outside air supplied from the cooling gas supply unit 12 </ b> C, and the adsorption power is recovered.

  The outside air that has cooled the honeycomb body 33 is sent from the cooling gas exhaust section 13C to the heater 5 and heated, and is supplied to the regeneration gas supply section 13B as a high-temperature regeneration gas. The regeneration gas desorbs the organic component adsorbed on the honeycomb body 33 and is discharged from the concentrated gas exhaust unit 12B as a concentrated gas containing the organic component. The exhausted concentrated gas is returned to the upstream side of the supply fan 25 and is sent again to the combustion processing apparatus 2 by the supply fan 25 for combustion processing.

  According to the exhaust gas treatment system 90 configured as described above, the following effects can be exhibited.

  The concentrated gas generated by the downstream concentration device 3 is further subjected to combustion processing by the combustion processing device 2, so that the residual rate of the organic components contained in the gas discharged to the outside is reduced and the removal efficiency is further improved. be able to.

  Since the outside air is used for cooling the adsorbent 31, even if the adsorbent 31 is cooled, organic components are not adsorbed on the adsorbent 31, and the adsorption efficiency of the adsorbent 31 can be sufficiently recovered.

  Since the outside air heat-exchanged with the part heated in the cooling unit of the downstream concentration device 3 is used as the regeneration gas supplied to the regeneration unit of the downstream concentration device 3, the heating means for the regeneration gas is used. The performance can be suppressed, that is, the performance of the heater 5 can be suppressed, and the thermal efficiency of the system can be improved.

(Another embodiment 2)
In the case where the concentration of the organic component contained in the exhaust gas discharged from a paint factory or the like is small, in addition to the other embodiment 1, an upstream concentrating device 6 may be further provided on the upstream side of the combustion processing device 2.

  FIG. 6 is a schematic view of an exhaust gas treatment system according to another embodiment 2 of the present invention, in which an upstream concentrating device 6 is arranged on the upstream side of the combustion treatment device 2. Another embodiment 2 is different from the above-described another embodiment 1 in that an upstream concentrating device 6 is disposed on the upstream side of the combustion treatment apparatus 2, and other configurations are the same as those of the above-described another embodiment 1. is there. For this reason, in the description of another embodiment 2, the same reference numerals are given to the same parts as those of the above-described another embodiment 1, and detailed description thereof will be omitted.

  As shown in FIG. 6, an upstream concentrating device 6 is disposed on the upstream side of the combustion processing device 2. Exhaust gas containing organic components discharged from a painting factory or the like is supplied from the supply fan 25 to the upstream side concentration device 6. The configuration of the upstream concentration device 6 is the same as the configuration of the downstream concentration device 3. Here, since the upstream side concentrating device 6 is supplied with exhaust gas from a factory or the like instead of the processed gas from the combustion processing device 2, the processed gas supply unit 12A in the downstream side concentrating device 3 is provided with the upstream side concentrating device. In the apparatus 6, it will be called the exhaust gas supply unit 12D.

  The exhaust gas supplied from the supply fan 25 passes through the honeycomb body 33 of the adsorbent 31 from the exhaust gas supply unit 12D, whereby the organic components in the exhaust gas are adsorbed and removed. Here, the purified gas from which the organic components have been removed in the upstream concentrator 6 is not released into the outside air, unlike the purified gas from the downstream concentrator 3, and is sent from the purified gas exhaust part 13A to the downstream concentrator 3. It is done.

  Further, the honeycomb body 33 that has become high temperature due to the supply of the regeneration gas is cooled by the outside air supplied from the cooling gas supply unit 12C, and the adsorption power is recovered.

  The outside air that has cooled the honeycomb body 33 is sent to the heater 7 from the cooling gas exhaust part 13C, heated, and supplied to the regeneration gas supply part 13B as a high-temperature regeneration gas. The regeneration gas desorbs the organic component adsorbed on the honeycomb body 33 and is discharged from the concentrated gas exhaust unit 12B as a concentrated gas containing the organic component. The exhausted concentrated gas is sent to the combustion processing apparatus 2 and subjected to combustion processing.

  According to the exhaust gas treatment system 90 configured as described above, the following effects can be exhibited.

  Conventionally, since the purified gas from the upstream concentrator disposed on the exhaust gas upstream side of the combustion treatment device has been released to the atmosphere, the purified gas is concentrated again in the downstream concentrator 3 to remove the organic component. An exhaust gas treatment system with further improved removal efficiency can be provided.

  Also in the upstream concentrating device 6, since the outside air is used for cooling the adsorbent 31, organic components are not adsorbed on the adsorbent 31 even when the adsorbent 31 is cooled, and the adsorption efficiency of the adsorbent 31 is sufficient Can be recovered.

  Since the outside air heat-exchanged with the part heated in the cooling unit of the upstream concentrator 6 is used as the regeneration gas supplied to the regeneration unit of the upstream concentrator 6, the heating means for the regeneration gas is used. The performance can be suppressed, that is, the performance of the heater 7 can be suppressed, and the thermal efficiency of the system can be improved.

  In the above embodiment and other embodiments 1 and 2, the combustion treatment device is a heat storage type combustion deodorization device, but the combustion treatment device of the present invention is not limited to the heat storage type deodorization device, and combustion treatment of exhaust gas containing organic components is performed. Any device can be used.

  In the said embodiment and another Embodiment 1, 2, the downstream concentration apparatus and the upstream concentration apparatus are each arrange | positioned 1 each, However, Each may be arrange | positioned in multiple numbers, and about arrangement | positioning, it is parallel. They may be arranged and may be arranged in series as shown in FIG.

  Moreover, about the downstream concentration apparatus and the upstream concentration apparatus, the concentration apparatus of the same structure may be used, and the concentration apparatus of a different structure may be used. For example, the adsorbent of the upstream concentrator may be composed of activated carbon, and the adsorbent of the downstream concentrator may be composed of zeolite. Moreover, although the structure of the adsorbent 31 is the honeycomb body 33, other structures may be used.

  When the concentrators are arranged in parallel, the heating means for the regeneration gas is preferably shared between the concentrators.

  Various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the appended claims.

  In the present invention, since an exhaust gas treatment system that can further improve the VOC removal efficiency can be provided, the industrial utility value is great.

2 Combustion treatment equipment
21 Combustion means 22 Combustion chamber 23 Heat storage chamber 24 Switching device
25 Supply fan 26 Heat storage
3 Downstream concentrator
30 Organic component removal equipment
31 Adsorbent
32 Rotor body
321 inner cylinder 322 rib 323 outer cylinder
33 Honeycomb body
4 Exhaust pipe
5 Heater
6 Upstream concentrator
7 Heater
10 Casing
10A 1st casing 10B 2nd casing
11 Partition plate
12A Processed gas supply unit 12B Concentrated gas exhaust unit 12C Cooling gas supply unit
13A Purified gas exhaust part 13B Regeneration gas supply part 13C Cooling gas exhaust part
12D exhaust gas supply unit
14 Filter
90 Exhaust gas treatment system
S axis
X junction

Claims (5)

An exhaust gas treatment system for treating organic components contained in exhaust gas,
A combustion treatment apparatus for combustion treatment of exhaust gas;
An organic component removal device that further removes organic components remaining in the treated gas treated by the combustion treatment device ,
The exhaust gas treatment system according to claim 1, wherein the organic component removal device is a downstream concentration device that concentrates the treated gas treated by the combustion treatment device .
The downstream concentrating device has an adsorbent that adsorbs organic components,
An adsorbing part through which the treated gas passes and adsorbs organic components contained in the treated gas;
A regeneration unit that is supplied with a high-temperature regeneration gas and desorbs the adsorbed organic component to generate a concentrated gas containing the organic component,
A cooling section in which cool air is supplied and a portion of the adsorbent heated by the high temperature regeneration gas is cooled;
To move sequentially,
The exhaust gas treatment system according to claim 1 , wherein the concentrated gas is supplied to the combustion treatment apparatus.
Outside air is used as the cold air,
The cold air portion and the heat exchanger of the heated adsorbent in the cooling portion of the downstream concentration unit is used as a regeneration gas to be supplied to the reproduction section of the downstream concentration unit, according to claim 1 or 2 Exhaust gas treatment system.
An upstream concentrator is provided on the exhaust gas upstream side of the combustion treatment device,
The exhaust gas treatment system according to any one of claims 1 to 3 , wherein the exhaust gas concentrated by the upstream concentration device is supplied to the downstream concentration device.
The upstream concentrator is configured to adsorb an adsorbent that adsorbs organic components.
An adsorbing part through which exhaust gas passes and adsorbs organic components contained in the exhaust gas,
A regeneration unit that is supplied with a high-temperature regeneration gas and desorbs the adsorbed organic component to generate a concentrated gas containing the organic component,
A cooling section in which cool air is supplied and a portion of the adsorbent heated by the high temperature regeneration gas is cooled;
To move sequentially,
The exhaust gas treatment according to claim 4 , wherein the cool air exchanged with the adsorbent part heated in the cooling unit of the upstream concentrator is used as a regeneration gas supplied to the regeneration unit of the upstream concentrator. system.

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