JPH0914633A - Gas treating device - Google Patents

Abstract

PURPOSE: To obtain a gas treating device, capable of effecting physical filtering treatment of soot, dust and the like from exhaust gas and capable of effecting adsorption treatment through active carbon efficiently, and capable of minimizing the amount of consumption of active carbon as far as possible. CONSTITUTION: A gas treating device is provided with filtrating fabric layers 9 and active carbon layers 10, arranged along the flow direction of objective gas for treating, an extracting mechanism 3 for extracting active carbon, whose adsorbing capacity is deteriorated, from the active carbon layers 10, an active carbon regenerating mechanism 4, regenerating deteriorated active carbon through mechanical treatment for exposing new adsorbing areas on the extracted deteriorated active carbon, and a mixing mechanism 7, mixing the powder of active carbon, which is generated by the mechanical treatment in the active carbon regenerating mechanism 4 into the objective gas of treatment in the upstream side of filtrating fabric layers 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention removes soot and dust, low boiling point metals, neutralizing agents for neutralizing acidic gases, and trace amounts of heavy metals contained in exhaust gas generated from, for example, city gas incinerators. The present invention relates to a gas treatment device for purifying.

[0002]

2. Description of the Related Art Bag filters and activated carbon adsorption devices are known as gas treatment devices used for the above purposes. The bag filter is provided with a filter tool having a filter cloth called a bag, and by passing the gas to be treated across the front and back surfaces of the filter cloth, a solid matter is captured on the surface of the filter cloth, Purify gas. On the other hand, the activated carbon adsorption device adsorbs a predetermined removed substance by activated carbon to purify the gas. Conventionally, these devices have been configured as devices independent of each other.

[0003]

However, if these devices are installed independently of each other, there is a problem that the space occupied by them is large and the equipment system, control system, etc. for each device are complicated. . Therefore, in order to solve these problems, an attempt has been made to treat the gas in a single gas treatment device by providing a filter cloth layer and an activated carbon layer along the flow direction of the gas to be treated. ing. Here, the activated carbon arranged in the activated carbon layer is deteriorated because it adsorbs the adsorbed substance to its adsorption site over time, and its adsorption ability is deteriorated. Therefore, conventionally, the deteriorated activated carbon has been taken out and replenished with new activated carbon. However,
If such an operating mode of the apparatus is adopted, the consumption rate of activated carbon is relatively high and the removal of a trace amount of heavy metals is not sufficient, and there is room for improvement in terms of stable operation of the apparatus. Further, a neutralizing agent mixing device is provided on the upstream side of the bag filter for the purpose of treating the acidic gas. Even in the combination of the neutralizing agent mixing device, the bag filter, and the activated carbon adsorbing device, the neutralizing agent mixing device is used. There was room for improvement from this point as well. Therefore, an object of the present invention is to solve the above problems.

[0004]

The first characteristic constitution of the gas treatment apparatus according to the present invention for attaining this object is that the gas treatment apparatus comprises a filter cloth layer and an activated carbon layer along the flow direction of the gas to be treated. And an extraction mechanism for extracting deteriorated activated carbon having a reduced adsorption capacity from the activated carbon layer, and activated carbon that regenerates the deteriorated activated carbon by performing a mechanical treatment to expose a new adsorption surface to the extracted deteriorated activated carbon. It is configured to include a regenerating mechanism and a mixing mechanism that mixes the activated carbon powder generated by the mechanical treatment in the activated carbon regenerating mechanism into the gas to be treated on the upstream side of the filter cloth layer. (According to claim 1). Further, in the above-mentioned first characteristic configuration of the present application, a sizing mechanism for sizing the regenerated activated carbon regenerated by the activated carbon regenerating mechanism is provided between the activated carbon regenerating mechanism and the mixing mechanism, It is preferable to provide a distribution circulation mechanism for supplying regenerated activated carbon to the mixing mechanism and returning the regenerated activated carbon on the coarse grain side to the activated carbon layer. This is the second characteristic configuration of the present application according to claim 2. Further, in the second characteristic configuration of the present application, it is preferable to include a particle size adjusting mechanism for adjusting the particle size of the activated carbon powder or the regenerated activated carbon on the fine particle side, which is guided to the mixing mechanism. This is the third characteristic configuration of the present application according to claim 3. Furthermore, a fourth characteristic configuration of the gas treatment apparatus according to the present invention for achieving the above object is provided with a filter cloth layer and an activated carbon layer along the flow direction of the gas to be treated, and the adsorption capacity of the activated carbon layer is higher than that of the activated carbon layer. With a mechanism for extracting the deteriorated activated carbon that has deteriorated, a mechanical treatment for exposing a new adsorption surface to the extracted deteriorated activated carbon, and a powder regeneration treatment mechanism for obtaining a powdery regenerated activated carbon with a particle size adjusted. A mixing mechanism for mixing the regenerated activated carbon powder obtained by the powder regeneration treatment mechanism into the gas to be treated on the upstream side of the filter cloth layer is provided. This relates to claim 4. The actions and effects thereof are as follows.

[0005]

In the gas treatment apparatus having the first characteristic configuration of the present application, the deteriorated activated carbon having a reduced adsorption capacity is extracted from the activated carbon layer by the extraction mechanism. Then, the deteriorated activated carbon extracted is subjected to a mechanical treatment by the activated carbon regenerating mechanism so that a new adsorption surface is exposed and regenerated. For example, the deteriorated activated carbon is pulverized, or the surface layer on which a large amount of the substance to be adsorbed is adsorbed is removed to expose a new adsorption active surface to the activated carbon. When such a mechanical regeneration operation is performed, activated carbon powder is generated along with the operation. Therefore, in the apparatus of the present application, the generated activated carbon powder is fed into the gas to be treated on the upstream side of the filter cloth layer by the mixing mechanism. This forms a coating layer of activated carbon on the surface of the filter cloth layer provided in the device. Like the conventional configuration,
When the neutralizing agent mixing device is provided on the upstream side of the filter cloth layer, the coating layer is a mixture of activated carbon and the neutralizing agent. Here, since the activated carbon powder to be mixed exhibits a new adsorption ability, it can be effectively used, the consumption of activated carbon can be reduced as a whole, and the removal efficiency of a trace amount of heavy metals can be increased, As a result, gas purification can be performed stably. Further, in the gas treatment device provided with such a filter cloth layer, the volume is removed from the filter cloth surface by, for example, backwashing operation with a predetermined amount of the object to be filtered on the filter cloth surface. , It will operate in the regenerated state. Therefore, the filter cloth can be easily regenerated, and a relatively large amount of carbon, which is a combustion source, is contained in the substance to be filtered which is passed to the post-treatment such as melting. It can be used as a heat source.

In the gas treatment device having the second characteristic configuration of the present application, the regenerated activated carbon regenerated from the activated carbon regenerating mechanism is sized by the sizing mechanism. Then, of the regenerated regenerated carbon that has been sized, the one on the fine grain side is added to the mixing mechanism.
The coarser particles are sent back into the activated carbon bed. The distribution and circulation mechanism is responsible for this function. Therefore, in this structure, the activated carbon powder and the activated carbon on the fine grain side form a coating layer on the surface of the filter cloth, and the same function as described above is performed. Further, the regenerated activated carbon on the coarse grain side can be returned to the activated carbon layer again to exhibit the main adsorption function of the activated carbon. Therefore, the activated carbon can be used without waste while properly reproducing it.

In the gas treatment apparatus having the third characteristic configuration of the present application, the particle size of the activated carbon powder introduced to the mixing mechanism or the regenerated activated carbon on the fine particle side is adjusted by the particle size adjusting mechanism. When adjusting the particle size in this way, a coating layer is formed on the surface of the filter cloth that can form a coating layer, but even if it is in a layered state, it still has a low ventilation resistance. The particle size can be adjusted as desired. Therefore, it is possible to operate the gas treatment apparatus preferably in terms of gas purification and gas pressure loss.

In the gas treatment apparatus having the fourth characteristic constitution of the present application, all of the deteriorated activated carbon extracted from the activated carbon layer by the extraction mechanism is mechanically treated by the powder regeneration treatment mechanism to be regenerated, and The particle size is adjusted.
Then, the powdery regenerated activated carbon in the regenerated state and in the state where the particle size is adjusted, by the mixing mechanism from the upstream side of the filter cloth layer,
It is mixed in the gas to be treated. Therefore, this powdered regenerated activated carbon forms a coating layer on the surface of the filter cloth layer, and can exhibit the action described in the first characteristic configuration of the present application. Furthermore, it has become possible to operate with low activated carbon consumption by effectively utilizing the deteriorated activated carbon which has been rarely used.

[0009]

Therefore, by adopting the first characteristic constitution of the present invention in the gas treatment apparatus, a coating layer of activated carbon is formed on the surface side of the filter cloth layer to reduce the consumption rate of activated carbon, soot and NOx. , The trace amount of heavy metals was removed sufficiently, and stable operation of the equipment became possible. Further, by adopting the second characteristic configuration of the present invention in the gas treatment device, it is possible to secure the purification performance in the coating layer formed on the surface of the filter cloth, and the regenerated activated carbon on the coarse grain side is again activated carbon layer. It has become possible to effectively use activated carbon by using it. Furthermore, by adopting the third characteristic configuration of the present invention in the gas treatment device, the particle size of the activated carbon forming the coating layer formed on the surface of the filter cloth is appropriately adjusted, and the purification performance for the gas to be treated and the gas By forming a coating layer that is preferable in terms of pressure loss, it has become possible to ensure good operating conditions. Therefore, by adopting the fourth characteristic configuration of the present invention in the gas treatment device, the deteriorated activated carbon is utilized again for forming the coating layer of the activated carbon on the surface side of the filter cloth layer to reduce the consumption rate of the activated carbon. , Dust, NOx, and trace heavy metals were sufficiently removed, and stable operation of the equipment became possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the gas treatment apparatus 1 of the present application will be described below with reference to the drawings. As shown in FIG. 1, the gas treatment apparatus 1 includes an apparatus main body 2 having a configuration similar to that of a conventional bag filter, an extraction mechanism 3, an activated carbon regenerating mechanism 4, and a separation unit which are provided in association with the apparatus main body 2. A grain mechanism 5, a grain size adjusting mechanism 6, and a mixing mechanism 7 are provided. Here, a plurality of gas treatment tools 8 provided in the apparatus main body 2 are, as described later, provided with a filter cloth layer 9 and an activated carbon layer 10 in this order in the flow direction of the gas to be processed. In Fig. 9, soot and dust and low boiling heavy metals are removed by filtration, and in the activated carbon layer 10, NOx and trace heavy metals are removed by adsorption. Then, in the case of activated carbon (deteriorated activated carbon) having a reduced adsorption capacity, a constitution is adopted in which these can be recycled for reuse.

The details will be described below. The apparatus body 2 is provided with an introduction part 12 having a gas inlet 11 for introducing a gas to be treated, a treatment part 13 in which a plurality of gas treatment tools 8 are disposed, and an upper side of the treatment part 13. And a discharge portion 15 having a gas outlet 14 through which the processed gas that has been processed by the gas processing tool 8 is discharged, in the gas flow direction.

As shown in FIG. 2, the gas treating tool 8 has a cylindrical outer configuration, and the gas is
The gas processing tool 8 is configured to flow into the cylinder from the peripheral portion 100, move upward in the cylinder, and flow from the top to the outlet 15. The gas processing tool 8 is configured by connecting a filter cloth layer 9 formed in a cylindrical shape and a processing material holding tool 16 which is also formed in a cylindrical shape at both end side peripheral edge portions thereof.

The processing material holder 16 is made of punching metal which is a porous body. The inner space of the cylinder is formed as a processing material storage space 17 capable of storing activated carbon for processing exhaust gas which is a processing target gas. Further, the partition plate 1 is provided in the lower portion of the processing material storage space 17.
8 is provided, and the activated carbon regenerating mechanism 4 in which the activated carbon stored inside is disposed at the bottom by the partition plate 18
Can be guided to the side.

A space is formed between the members of the treatment material holder 16 and the filter cloth layer 9 and serves as a backwash gas supply space 19 capable of supplying backwash gas. A backwash gas supply mechanism 20 for appropriately supplying the backwash gas is provided in the space 19.

In the gas treatment device 1 of the present application, the exhaust gas flows in the order of the introduction part 12, the filter cloth layer 9, the backwash gas supply space 19, the treatment material holder 16, and the treatment material storage space 17 to perform gas treatment. The treated gas outlet 21 provided at the top of the tool discharges the gas to the outlet 15. Therefore, the filter cloth layer 9 collects the neutralizing agent for removing the acidic gas, the exhaust gas dust, and the low boiling heavy metal.
Can be removed. Further, the activated carbon stored in the processing material storage space 17 can remove NOx, trace heavy metals, and the like. Further, when the predetermined amount of time has passed and the removed material 22 has accumulated on the surface of the filter cloth, the above-described backwash gas supply mechanism 20 is appropriately operated to perform backwash accompanied by a shocking change in gas pressure. Is performed. Then, the removed matter 22 is collected in a dust collection chamber (not shown) provided in the lower portion of the apparatus main body, taken out of the apparatus, and a subsequent process (for example, melting process) is performed. In this case, in the present application, since the activated carbon powder is contained in the removed material 22, the activated carbon powder can be used as a heat source at the time of burning and melting, and the processing can be smoothly performed.

The above is the structure and function of the apparatus main body 2 of the present application. In the gas processing apparatus 1 of the present application, a configuration is adopted in which the activated carbon in the gas processing tool 8 is regenerated and reused. Has been done. That is, as shown in FIG. 1, in the gas treatment device 1 of the present application, an extraction mechanism 3 for extracting deteriorated activated carbon having a lower adsorption capacity than the activated carbon layer 10 formed in the treatment material storage space 17, and an extraction mechanism. An activated carbon regenerating mechanism 4 is provided for regenerating the deteriorated activated carbon by performing a mechanical treatment on the deteriorated activated carbon to expose a new adsorption surface. Further, a mixing mechanism 7 for mixing the activated carbon powder generated by the mechanical treatment in the activated carbon regeneration mechanism 4 into the gas to be treated on the upstream side of the filter cloth layer 9 is provided.

The extraction mechanism 3 includes the gas treatment tool 8
And a discharge pipe 3a capable of dropping and discharging the deteriorated activated carbon from the treatment material storage space 17 and an opening / closing mechanism (not shown) for the partition plate 18 described above. The activated carbon regeneration mechanism 4
Is a so-called milk crusher, which is a milled process of deteriorated activated carbon to expose a new adsorption surface of the activated carbon on which the substance to be adsorbed is not adsorbed. In this treatment, depending on the degree of treatment, it is possible to remove the surface layer on which the substance to be adsorbed is adsorbed or crush the activated carbon to expose a new adsorption surface inside the activated carbon.
In such a mechanical treatment, activated carbon powder is generated. The mixing mechanism 7 uses the activated carbon powder generated as described above, and the regenerated activated carbon on the fine grain side having a relatively uniform grain size obtained through the sizing mechanism 5 and the grain size adjusting mechanism 6, which will be described separately, as a gas to be treated. Is for mixing in the gas flow path 24 through which Therefore, this is provided with the mixing port 7a opening to the gas flow path 24, and this mixing port 7a
In addition, an activated carbon transfer path 7b for guiding a predetermined substance (activated carbon powder and regenerated activated carbon on the fine particle side) from the particle size adjusting mechanism 6 and a blower 7c for gas transfer are configured.

As shown in FIG. 1, the activated carbon regeneration mechanism 4 is used.
And a mixing mechanism 7 are provided with a sizing mechanism 5 for sizing the regenerated activated carbon regenerated by the activated carbon regenerating mechanism 4, and guides the regenerated activated carbon on the fine grain side to the mixing mechanism 7 side, and A distribution circulation mechanism 25 for returning the regenerated activated carbon on the grain side to the activated carbon layer 10 provided in the gas treatment tool 8 is provided. Further, the particle size adjusting mechanism 6 for adjusting the particle size of the activated carbon powder or the regenerated activated carbon on the fine particle side guided to the mixing mechanism 7 is provided in the activated carbon transfer path 7b of the mixing mechanism 7 on the lower side of the sizing mechanism 5. ing.

The above is the structure of the gas treatment apparatus 1 of the present application. In the present application, the activated carbon has an adsorption capacity of about 30 to 50% from the treatment material storage space 17 in the gas treatment tool 8. It is taken out in the state of doing. Then, the surface is desorbed and pulverized by a milk crusher constituting the activated carbon regenerating mechanism 4 to be regenerated to be regenerated activated carbon. In this process, activated carbon powder is generated. The regenerated activated carbon that has been regenerated is sent to the sizing mechanism 5, where it is sized into fine particles and coarse particles. Then, the fine particles are sent to the mixing mechanism 7 side together with the above-mentioned activated carbon powder and mixed into the gas to be treated. Therefore, the activated carbon mixed from this part, together with the neutralizing agent for the acidic gas mixed at the same time,
The coating layer 26 is formed on the surface of the filter cloth layer to exert its respective functions. On the other hand, the regenerated activated carbon on the coarse particle side is refilled in the processing material storage space 17 in the gas processing tool 8 described above,
At this site, it exerts an adsorption effect. Therefore, in the structure of the present application, the activated carbon can be fully utilized, and the consumption amount of the activated carbon and the neutralizing agent in the entire device can be suppressed more than before.

Another Embodiment Another embodiment of the present application will be described below. (A) In the above-mentioned embodiment, the ordinary activated carbon is used as the material to be stored in the treatment material storage space. However, as such a material, activated coke can be also included. It is called activated carbon in a broad sense. (B) In the above embodiment, the deteriorated activated carbon is regenerated, the regenerated activated carbon is separated according to the particle size, and the coarse particle side is returned to the gas treatment tool.
Even if all of the deteriorated activated carbon is pulverized and regenerated and mixed into the gas to be treated, the consumption of the activated carbon can be reduced by reusing the activated carbon.
Such an example is shown in FIG. An example of what is shown in FIG.
Compared with the example shown in FIG. 1, even the example shown in FIG. 3 is provided with the extracting mechanism 3 and the mixing mechanism 7. However, in this example, a sizing mechanism is not provided, and in order to carry out the regenerated activated carbon in a state suitable for mixing, it is necessary to obtain the powdered regenerated activated carbon whose particle size is adjusted by the powder regeneration processing mechanism 500. , This is configured. That is, the powder regeneration processing mechanism 500 includes the milk crusher 500a of the above-described example and the particle size adjusting mechanism 500b for adjusting the particle size of the regenerated activated carbon discharged from the crusher 500a. As a result, by this mechanism 500, all of the powdery regenerated activated carbon that has been pulverized, adjusted in particle size, and regenerated is mixed into the gas to be treated and used. In the case of this configuration, the activated carbon is extracted with the activity of the activated carbon being relatively low,
It serves to form the coating layer 26 on the surface of the filter cloth layer. (C) In the above-described embodiment, the timing of the operation of extracting the activated carbon from the gas treatment tool was a periodic batch operation with the progress of the treatment, but even if it is configured to be continuously extracted, The purpose can be achieved.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a gas treatment device of the present application.

FIG. 2 is a diagram showing a detailed configuration of a gas treatment tool of the present application.

FIG. 3 is a diagram showing another configuration example of the gas treatment device of the present application.

[Explanation of symbols]

 3 Extraction mechanism 4 Activated carbon regeneration mechanism 5 Grain size mechanism 6 Particle size adjustment mechanism 7 Mixing mechanism 9 Filter cloth layer 10 Activated carbon layer 500 Powder regeneration treatment mechanism

Claims (4)

[Claims] 1. A filter cloth layer (9) and an activated carbon layer (10) are provided along a flow direction of a gas to be treated, and the activated carbon layer (1).
0), the activated carbon regenerating mechanism is provided with a withdrawing mechanism (3) for withdrawing the deteriorated activated carbon having a lower adsorption capacity, and performing a mechanical treatment to expose a new adsorption surface to the withdrawn deteriorated activated carbon to regenerate the deteriorated activated carbon. A mixing mechanism (7) that includes (4) and that mixes the activated carbon powder generated by the mechanical treatment in the activated carbon regeneration mechanism (4) into the gas to be treated upstream of the filter cloth layer (9). ) Equipped with a gas treatment device. 2. A sizing mechanism (5) for sizing the regenerated activated carbon regenerated by the activated carbon regenerating mechanism (4) is provided between the activated carbon regenerating mechanism (4) and the mixing mechanism (7), The gas according to claim 1, further comprising a distribution circulation mechanism (25) for supplying the regenerated activated carbon on the fine grain side to the mixing mechanism (7) and returning the regenerated activated carbon on the coarse grain side to the activated carbon layer (10). Processing equipment. 3. The gas treatment apparatus according to claim 2, further comprising a particle size adjusting mechanism (6) for adjusting the particle size of the activated carbon powder or the regenerated activated carbon on the fine particle side, which is guided to the mixing mechanism (7). 4. The activated carbon layer (1) is provided with a filter cloth layer (9) and an activated carbon layer (10) along the flow direction of the gas to be treated.
0), which is equipped with a withdrawal mechanism (3) for withdrawing the deteriorated activated carbon having a lower adsorption capacity, and a mechanical treatment for exposing a new adsorption surface to the extracted deteriorated activated carbon to adjust the particle size of powdered regenerated activated carbon. Powder regeneration processing mechanism (50
0), and the powder regeneration treatment mechanism (50
0) The powdered regenerated activated carbon obtained in 0) is equipped with a mixing mechanism (7) for mixing the powdered regenerated activated carbon into the gas to be treated on the upstream side of the filter cloth layer (9).