JP3641393B2 - Exhaust gas treatment method and apparatus using pulse dust removal type bag filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention enables various treatments such as deodorization and desulfurization by bringing various exhaust gases such as combustion harmful gas and malodorous gas into contact with the reaction aid adhered to the filter cloth surface of the pulse dust removal type bag filter. The present invention relates to an exhaust gas treatment method using a devised pulse dust removal type bag filter and an apparatus therefor.
[0002]
[Prior art]
Regarding an exhaust gas treatment apparatus capable of reacting exhaust gas using a reaction aid adhered to a filter cloth surface of a pulse dust removal type bag filter, for example, Japanese Utility Model Laid-Open No. 7-13422 (Japanese Utility Model Application No. 5-44988) has been known. There is a bag filter type deodorizing apparatus as described in No.).
[0003]
This deodorizer is designed so that the deodorizer can be used repeatedly until it reaches saturation, and the used deodorizer attached to the filter cloth surface of the bag filter in the filter chamber is used for the deodorization. Then, after the hopper is wiped down to the lower hopper, it is collected in the deodorant supply tank and reused.
[0004]
[Problems to be solved by the invention]
However, according to the conventional bag filter type deodorization apparatus, the gas adsorption function (deodorization function) of the deodorant is high at the initial time when the new deodorant is supplied, but the adsorption performance is gradually increased by repeatedly using this. There is a problem that the exhaust gas adsorption performance fluctuates (deteriorates) during the entire running, and a sufficient deodorizing effect cannot be exhibited.
[0005]
Further, the conventional bag filter type deodorizing apparatus is for recovering and reusing the used deodorant, which has been wiped off by pulse jet air, in a supply tank containing the same deodorant. Since it is configured to use a deodorizer, for example, when removing or deodorizing mixed gases such as acid gas or alkaline gas having different properties, a plurality of the above-mentioned bag filter type deodorization devices (removal devices) are used. It is necessary to select and use a removal device according to the gas to be processed, and the use operation is very complicated, and the entire device becomes complicated and large, resulting in high costs.
[0006]
Therefore, the technical problem of the present invention is that it is possible to reuse the used reaction aid (deodorant, etc.) that has been removed from the bag filter without deteriorating the adsorption treatment function for exhaust gas, and a single treatment device. It is an object to provide an exhaust gas treatment method using a pulse dust removal type bag filter and an apparatus thereof capable of treating multiple types of exhaust gas.
[0007]
[Means for Solving the Problems]
Means taken in the present invention to solve the above technical problems are as follows.
[0008]
A powdery reaction aid is attached to the filter cloth surface of the pulse dust-removing bag filter, and the exhaust gas such as combustion harmful gas and malodorous gas that passes through the bag filter under the suction action of the blower is brought into contact with the reaction aid. Exhaust gas using a pulse dust removal type bag filter in which the spent reaction aid adhering to the filter cloth surface of the bag filter is removed to the lower hopper with pulse jet air for backwashing while the reaction treatment is performed. A processing method,
[0009]
(1) After the above-mentioned used reaction assistant is wiped off with pulse jet air, one or more kinds of new reaction assistants are attached to the filter cloth surface of the bag filter, and then are wiped off into the hopper. The spent reaction aid is attached to the outer surface of the new reaction aid, which is attached to the filter surface of the bag filter, and the exhaust gas is reacted with the old and new reaction aids. To do. (Claim 1)
[0010]
(2) After removing the used reaction aid to the lower hopper with pulse jet air, select one or more required reaction aids from multiple new reaction aids. Adhering to the filter cloth surface of the bag filter, and then adhering the used reaction aids, which have been scraped into the hopper, to the outer surface of the new reaction aid. (Claim 2)
[0011]
(3) Spent the spent reaction aid that has been scraped off to the hopper with air, and apply it to the outer surface of the new reaction aid by using the suction action of the blower. (Claim 3)
[0012]
(4) The spent reaction aid that has been scraped off to the hopper is collected outside the hopper, and the collected spent reaction aid is re-supplied to the bag filter side by the blower blowing action or suction action. Multiple adhesion to the outer surface of the agent. (Claim 4)
[0013]
The powdery reaction aid supplied or sucked into the filter chamber through the exhaust gas introduction duct under the blower's blowing action or suction action adheres to the filter cloth surface of the pulse dust removal type bag filter and is sucked through the introduction duct. The exhaust gas such as flammable toxic gas and bad odor gas is brought into contact with the above reaction aid for reaction treatment, while the used reaction aid adhering to the filter cloth surface of the bag filter is treated with a pulse jet for backwashing. An exhaust gas treatment apparatus using a pulse dust removal type bag filter configured to be backwashed with air and wiped off to the lower hopper,
[0014]
(5) One or more auxiliary agent supplying means for supplying a new reaction auxiliary agent are connected in the middle of the exhaust gas introduction duct, and the used auxiliary agent is removed by pulse jet air to the hopper. An auxiliary agent raising means for raising the air by blowing air is provided, and after the supply of the new reaction auxiliary by the auxiliary agent supply means is finished, the used auxiliary reaction agent is raised by the auxiliary agent raising means. Then, the old and new reaction aids are sequentially and multiply attached to the filter surface of the bag filter. (Claim 5)
[0015]
(6) One or more new auxiliary agent supplying means for supplying a new reaction auxiliary agent in the middle of the exhaust gas introduction duct, and use for supplying a used reaction auxiliary agent recovered from the hopper After the spent auxiliary agent supply means is connected and the supply of the new reaction auxiliary agent by the new auxiliary agent supply means is completed, the spent auxiliary reaction agent is supplied by the used auxiliary agent supply means, and the bag filter is filtered. Construct so that old and new reaction aids are attached to the cloth surface in sequence and in multiple layers. (Claim 6)
[0016]
Here, the reaction aid means, for example, a deodorizing agent, a denitrating agent, or a desulfurizing agent formed in a powder form.
[0017]
(1) According to the means (exhaust gas treatment method) according to claim 1 described in (1) above, one or more kinds of unused ones are used after the spent reaction aid is removed with pulse jet air. A new reaction aid is attached to the filter cloth surface of the bag filter, and then the spent reaction aid removed from the bag filter is attached to the outer surface of the new reaction aid in multiple layers. First, roughing reaction treatment (AC contact) can be performed, and then finishing treatment can be performed with a new reaction aid in the inner layer, and the removal efficiency is reduced by reusing the used reaction aid. Therefore, it is possible to improve the treatment effect such as deodorization and desulfurization for exhaust gas by exhibiting a stable adsorption action by the old and new reaction aids deposited in multiple layers.
[0018]
(2) According to the means (exhaust gas treatment method) according to claim 2 described in (2) above, a necessary reaction assistant is selected from a plurality of kinds of new reaction assistants, and this is filtered by a bag filter. In order to adhere multiple used reaction aids to the outer surface of the new reaction aid, the old and new reaction aids, which are deposited in multiple layers, are used for the exhaust gas. Since the treatment effect can be improved and a plurality of types of reaction aids can be used, by selecting the reaction aid to be used according to the type of exhaust gas to be treated, for example, acid gas or alkaline It makes it possible to perform a reaction process according to exhaust gas having different properties.
[0019]
(3) According to the means (exhaust gas treatment method) according to claim 3 described in the above (3), the spent reaction aid removed by the pulse jet air is swollen with air, and the blower Multiple layers can be attached to the outer surface of the new reaction aid by the suction action, so these new and old layers of reaction aid formed on the filter cloth surface of the bag filter efficiently react with the exhaust gas in a stable state. Make it possible to do.
[0020]
(4) According to the means (exhaust gas treatment method) according to claim 4 described in (4) above, the used reaction aid that has been scraped off by the pulse jet air is recovered outside the hopper, and this is collected into the blower. The new and old layers of reaction aids that are formed on the filter cloth surface of the bag filter can be attached to the outer surface of the new reaction aid by air blowing or suction. It makes it possible to react well.
[0021]
(5) According to the means (exhaust gas treatment device) according to claim 5 described in the above (5), the bag filter in which dust is removed from one or a plurality of auxiliary agent supply means connected in the middle of the exhaust gas introduction duct. One or more kinds of new reaction aids required for the surface of the reactor are sequentially supplied and adhered in multiple layers, and used reaction aids that have been scraped off to the hopper by pulse jet air Since it is lifted up by the lifting means and is deposited on the outer surface of the new reaction aid, it exhibits a stable adsorption action by the old and new layers of the reaction aid formed on the multiple layers, and the exhaust gas Can be efficiently reacted.
[0022]
(6) According to the means (exhaust gas treatment device) according to claim 6 described in (6) above, one or more kinds of required new reaction aids are added to the bag filter according to the type of exhaust gas to be treated. In addition, the used reaction aid recovered from the hopper to the used auxiliary agent supply means can be deposited on the outer surface of the new reaction aid, so that the filter of the bag filter can be filtered. These new and old layers of reaction aids formed in multiple layers on the fabric surface enable various types of exhaust gases to be efficiently reacted in a stable state.
[0023]
As described above, the technical problems described above can be solved by the means (1) to (6), and the problems of the conventional techniques can be solved.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an exhaust gas treatment method using a pulse dust removal type bag filter according to the present invention and an apparatus thereof will be described with reference to the drawings. FIG. 1 is a front view illustrating the appearance of the exhaust gas treatment apparatus of the present invention, and FIG. FIG. 3 is an enlarged side view showing the whole of the present invention. In these drawings, a reference numeral 1 indicates a bag filter type dust collector, and 1A and 1B are A clean chamber and a filter chamber of the dust collector 1 which are partitioned vertically by the partition plate 1X, 1C is a hopper connected to the lower side of the filter chamber 1B, 2... Are bag filters suspended in the filter chamber 1B.
[0025]
3 is a pulse jet blow tube provided inside the clean chamber 1A, 3T is a header pipe, 3A... Is an air jet nozzle provided in the blow tube 3, and is blown from the header pipe 3T. Pulsed jet air (compressed air) sent to the tube 3 is blown into the bag filters 2 from the nozzles 3A, so that the used reaction adhered to the filter cloth surface of the bag filters 2 ... The structure is such that the auxiliary agent can be removed to the lower hopper 1C.
[0026]
4 is a suction duct connected to the clean chamber 1A of the dust collector 1, 4A is a suction blower (suction fan) connected to the front end side of the suction duct 4, 4M is a blower drive motor, 4T is an air volume control valve, and 4B is a drainage valve. In the cylinder, the suction action of the suction blower 4A extends from the clean chamber 1A of the dust collector 1 through the suction duct 4 to the bag filter 2... And the filter chamber 1B to the exhaust gas introduction duct 7, and the exhaust gas is collected into the dust collector 1. It is structured to suck into the filter chamber 1B.
[0027]
Further, in the figure, 5 is a discharge device for the used reaction aid provided at the bottom of the hopper 1C, 5S is a discharge screw constituting the discharge device 5, and the used reaction aid discharged by the screw 5S is Then, it is sent to the flexible container 6 through the discharge valve 5A and the discharge duct 5B and collected, and then used reaction auxiliary agent supply means (supply tank) which will be described later using a transport means such as a hoist 15 attached to the guide rail 14 This is an example of implementation. For example, the spent reaction aid recovered in the hopper 1C is directly fed into the supply tank using a transport air pipe or the like. However, the selection is arbitrary.
[0028]
Further, in the figure, reference numeral 8 denotes an aeration pipe capable of sending compressed air to an air injection pipe 8A provided in the hopper 1C and soaking up a used reaction aid that has fallen into the hopper 1C and accumulated. Is an auxiliary agent supply duct whose tip is connected to the exhaust gas introduction duct 7, 10 and 11 are auxiliary agent supply tanks connected in the middle of the supply duct 9, and 10A and 11A are auxiliary agent supply valves provided in the tanks 10 and 11, respectively. , 12 is an auxiliary agent supply blower provided in the supply duct 9, and 12M is a drive motor for the reaction contained in the supply tanks 10, 11 by the functions of the blower 12 and supply valves 10A, 11A. The structure is such that the auxiliary agent can be sequentially fed into the filter chamber 1B of the dust collector 1 through the supply duct 9.
[0029]
In FIG. 1, auxiliary supply blowers 12 and 12 and supply ducts 9 and 9 are provided for each auxiliary supply tank 10 and 11, and reaction auxiliary agents are separately supplied to the exhaust gas introduction duct 7. This is an example of implementation, and as shown in the block diagram of FIG. 3, two auxiliary agent supply tanks 10 and 11 are connected to one supply duct 9, and The auxiliary apparatus supply blower 12 may supply the reaction auxiliary agents in the auxiliary agent supply tanks 10 and 11 in order, thereby simplifying the entire apparatus. To do.
[0030]
Further, the configuration diagram shown in FIG. 3 shows a configuration in which the used reaction auxiliary agent recovered in the flexible container 6 using the screw 5S is sent to the second auxiliary agent supply tank 10 and reused. This is also an example of implementation, and each of the first auxiliary agent supply tank 11, the second auxiliary agent supply tank 10, or the third auxiliary agent supply tanks of three or more, A third or other supply tank (not shown) that contains different types of new reaction aids selected according to the nature of the exhaust gas, while separately providing spent reaction aids recovered using the flexible container 6 The used reaction aid can be reused only by raising it up by air injection (aeration) from the air injection pipe 8A without using the flexible container 6 and reusing it. In At best, the selection is also optional.
[0031]
1 to 3, 1H is a support leg for supporting the dust collector 1, 1R is a support base, 1E and 1F are protective fences, and 7A is a tip portion of an exhaust gas introduction duct 7 connected to the dust collector 1. , 7X is a check valve, and 13 is the dust (reaction aid) rising from the auxiliary agent supply tanks 10 and 11 when the reaction auxiliary agent is supplied, and sucking it to the duct 7 side using the hoods 13A and 13B. It is a dust collection duct to be made.
[0032]
Since the present invention is configured as described above, the air blowing action of the auxiliary agent supply blower 12 is exerted, and further, the suction action of the suction blower 4A is applied to the exhaust gas introduction duct 7 side through the inside of the dust collector 1. When the supply valve 11A of the second auxiliary agent supply tank 11 is operated and new unused reaction auxiliary agent is sent out to the supply duct 9, this reaction auxiliary agent is sent into the filter chamber 1B of the dust collector 1 through the exhaust gas introduction duct 7. Therefore, this new reaction aid can be attached to the filter cloth surface of each bag filter 12.
[0033]
Next, when the supply valve 10A of the second auxiliary agent supply tank 10 is actuated to send out a different new reaction auxiliary agent to the supply duct 9, the reaction auxiliary agent is attached to the bag filters 2 in an air stream. It is possible to form a double layer of different unused reaction aids on the filter cloth surface of each bag filter 2... By adhering to the outer surface of the agent layer. Of course, it is not necessary to attach the reaction aid of the second auxiliary agent supply tank 10.
[0034]
Thereafter, air is injected from the air injection pipe 8A and the spent reaction aid accumulated in the hopper 1C is raised to the filter chamber 1B, or a third or other auxiliary supply tank not shown in the figure. The spent reaction aid collected in the air is placed in an air stream and sent to the filter chamber 1B, so that the layer of the spent reaction aid (third layer) is multiplexed on the outer surface of the second reaction aid. Adhesion can be formed.
[0035]
FIG. 4 is a cross-sectional view illustrating a state in which a total of three layers of the reaction assistants are formed on the filter cloth surface of the bag filter 2. In FIG. 4, 2A is the reaction aid for the first layer using, for example, zeolite. The agent layer, 2B is, for example, the second reaction assistant layer using activated coke, and 2C is the third used reaction assistant layer (for example, zeolite + active coke), which was used last time, The exhaust gas that passes through is first roughened (AC contact) by the third spent reaction aid layer 2C, and then the second new reaction aid layer 2B and the first new reaction aid layer. Contact is repeated in the order of 2A, reaction treatment such as deodorization and desulfurization is performed, and the purified gas after the reaction treatment is discharged to the clean chamber 1A side through the bag filter 2 and further through the suction duct 4 to the dust collector. It is structured to be discharged to the outside of 1.
[0036]
Each of the reaction aid layers 2A, 2B, 2C, which has been subjected to the above reaction process, is applied to the lower hopper 2C by pulse jet air blown into the bag filters 2 from the nozzles 3A of the blow tube 3 at a certain time. Then, the above-mentioned adhesion process of each reaction aid is repeated again to form multiple reaction aid layers 2A, 2B, 2C on the filter cloth surface of each bag filter 2. Resume processing operation.
[0037]
In the configuration diagram shown in FIG. 3, the used reaction aid 2C recovered using the flexible container 6 is sent to the second auxiliary agent supply tank 10 and reused. The spent reaction aid layer 2C is deposited and formed on the outer surface of the first reaction aid layer 2A formed by the new reaction aid supplied from the eye aid supply tank 11. Of course, this is an example of implementation.
[0038]
【The invention's effect】
As described above, according to the exhaust gas processing method and apparatus using the pulse dust removal type bag filter according to the present invention, an unused new reaction aid layer is first formed on the filter cloth surface of the bag filter. Since the layers of used reaction aids that have been wiped off by pulse jet air are deposited on the outside of the layers in multiple layers, these new and old reaction aid layers can be used without degrading the adsorption capacity of the reaction aids. It is possible to efficiently treat exhaust gas by using this method and to attach a plurality of different types of reaction aids to the filter cloth surface of the bag filter. Combined with the point that the used reaction aid can be effectively reused and the existing dust collector can be used as it is, it is used for deodorization and desulfurization of various exhaust gases. It is suitable for.
[Brief description of the drawings]
FIG. 1 is a front view of a dust collector embodying the present invention.
FIG. 2 is a side view of a dust collecting apparatus embodying the present invention.
FIG. 3 is a configuration diagram clearly showing the whole of the present invention.
FIG. 4 is an enlarged cross-sectional view showing a layer of reaction aids that are formed in multiple layers on the filter cloth surface of a bag filter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dust collector 1C Hopper 2 Bag filter 2A, 2B New reaction aid layer 2C Used reaction aid layer 3 Pulse jet air blow tube 4A Suction blower 5 Used reaction aid discharge device 7 Exhaust gas introduction duct 8A Air injection pipes 10 and 11 for raising the reaction aid supply tank 12 Auxiliary supply blower

Claims (6)

A powdery reaction aid is attached to the filter cloth surface of the pulse dust-removing bag filter, and the exhaust gas such as combustion harmful gas and malodorous gas that passes through the bag filter under the suction action of the blower is brought into contact with the reaction aid. Exhaust gas using a pulse dust removal type bag filter in which the spent reaction aid adhering to the filter cloth surface of the bag filter is removed to the lower hopper with pulse jet air for backwashing while the reaction treatment is performed. A processing method,
After the used reaction aid is wiped off with pulse jet air, one or more kinds of new reaction aids are attached to the filter cloth surface of the bag filter, and then used in the hopper. The reaction aid is adhered to the outer surface of the new reaction aid attached to the filter surface of the bag filter, and the exhaust gas is reacted with the old and new reaction aids attached in multiple layers. An exhaust gas treatment method using a pulse dust removal type bug filter as a feature. After removing the used reaction aid to the lower hopper with pulse jet air, select one or more required reaction aids from multiple types of new reaction aids and filter them through the bag filter. 2. The pulse dust removing type bag filter according to claim 1, wherein the used reaction aid that has adhered to the cloth surface and then dropped into the hopper is adhered to the outer surface of the new reaction aid. Exhaust gas treatment method using 3. The spent reaction aid that has fallen to the hopper is blown up with air, and this is adhered to the outer surface of the new reaction aid in multiple using the suction action of the blower. Exhaust gas treatment method using a pulse dust removal type bag filter. The spent reaction aid removed to the hopper is collected outside the hopper, and the collected spent reaction aid is re-supplied to the bag filter side by the blower blowing action or suction action to remove the new reaction aid. The exhaust gas treatment method using a pulse dust-removing bag filter according to claim 1 or 2, wherein a plurality of deposits are attached to the side surface. The powdery reaction aid supplied or sucked into the filter chamber through the exhaust gas introduction duct under the blower's blowing action or suction action adheres to the filter cloth surface of the pulse dust removal type bag filter and is sucked through the introduction duct. The exhaust gas such as flammable toxic gas and bad odor gas is brought into contact with the above reaction aid for reaction treatment, while the used reaction aid adhering to the filter cloth surface of the bag filter is treated with a pulse jet for backwashing. An exhaust gas treatment apparatus using a pulse dust removal type bag filter configured to be backwashed with air and wiped off to the lower hopper,
One or a plurality of auxiliary agent supply means for supplying a new reaction auxiliary agent are connected in the middle of the exhaust gas introduction duct, and the used auxiliary agent removed by pulse jet air is supplied to the hopper with air. Auxiliary uplifting means is provided for jetting up, and after the supply of the new reaction auxiliary by the auxiliary supply means is completed, the spent reaction auxiliary is raised up by the auxiliary uplifting means, An exhaust gas treatment apparatus using a pulse dust removal type bag filter, characterized in that the old and new reaction aids are sequentially and multiply attached to the filter cloth surface of the bag filter. The powdery reaction aid supplied or sucked into the filter chamber through the exhaust gas introduction duct under the blower's blowing action or suction action adheres to the filter cloth surface of the pulse dust removal type bag filter and is sucked through the introduction duct. The exhaust gas such as flammable toxic gas and bad odor gas is brought into contact with the above reaction aid for reaction treatment, while the used reaction aid adhering to the filter cloth surface of the bag filter is treated with a pulse jet for backwashing. An exhaust gas treatment apparatus using a pulse dust removal type bag filter configured to be backwashed with air and wiped off to the lower hopper,
One or more new auxiliary agent supplying means for supplying a new reaction auxiliary agent in the middle of the exhaust gas introduction duct, and a used auxiliary agent for supplying the used reaction auxiliary agent recovered from the hopper After the supply means is connected and the supply of the new reaction auxiliary by the new auxiliary agent supply means is completed, the used reaction auxiliary agent is supplied by the used auxiliary agent supply means, and the bag filter is applied to the filter cloth surface. An exhaust gas treatment apparatus using a pulse dust removal type bag filter, characterized in that old and new reaction aids are sequentially and multiply attached.

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