JP5397967B1 - Filter cloth regeneration method and bag filter device - Google Patents

Abstract

The present invention relates to a novel filter cloth regeneration method and a bag filter apparatus capable of effectively regenerating the filter cloth provided in the bag filter apparatus without imposing an excessive burden on the bag filter apparatus. The purpose is to provide.
During the processing of gas by a bag filter device, when it becomes necessary to regenerate a filter cloth arranged in one dust collection chamber, a dust collected on the filter cloth is removed. By carrying out in parallel the dropping-off process for dropping and the first medicine-injecting process for injecting the medicine, the dust collected on the filter cloth 3 is removed while protecting the filter cloth 3 with the medicine. After dropping, the chemical layer is applied to the filter cloth 3 by executing an introduction amount adjusting step for adjusting the gas introduction amount to the dust collecting chamber 2A and a second chemical injection step for injecting the chemical. Form.
[Selection] Figure 1

Description

  The present invention relates to a filter cloth regeneration method in a bag filter device and a bag filter device.

  A dust collecting device called a bag filter device has a mechanism for passing gas through a filter cloth arranged in a dust collecting chamber and filtering and collecting the dust contained in the gas. In the bag filter apparatus currently in practical use, in order to neutralize the acid gas contained in the gas and protect the filter cloth, the gas introduced into the dust collection chamber through the flue is added to an alkali such as slaked lime. The mainstream is a type in which a drug consisting of components is accompanied, and a dust layer consisting of a mixture of the dust and the drug is formed on the surface of the filter cloth.

  By the way, the dust collection ability of the bag filter device is improved with the growth of the dust layer, but the pressure loss increases as the dust layer formed on the surface of the filter cloth becomes thicker. Therefore, in the bag filter device, it is necessary to regenerate the filter cloth by removing the dust layer from the filter cloth periodically or when the pressure loss increases to a certain value or more.

  However, the bag filter device immediately after the dust layer is wiped off has a low dust processing capacity because the dust layer is not completed on the filter cloth, and also has a low neutralizing ability for acid gas.

  For this reason, a method of forming a drug layer (precoat layer) on the surface of the filter cloth after the dust layer is wiped off and before resuming the filtration operation has been proposed (for example, Patent Documents 1 and 2 below). reference.).

Japanese Patent Laid-Open No. 5-123515 JP 9-10531 A

  However, the methods proposed in Patent Document 1 and Patent Document 2 are both bag filter devices having a plurality of dust collection chambers. Since the gas removal operation is performed after the gas introduction is cut off, the amount of gas introduced into the other dust collection chamber is reduced by the amount that the gas introduction into one dust collection chamber was blocked during the gas removal operation. To increase.

  Here, incineration facilities and the like are required to reduce the installation space of the entire facility as much as possible. Accordingly, the bag filter apparatus is currently selected as small as possible having the minimum necessary processing capacity capable of processing the gas discharged from the facility.

  For this reason, if the introduction of gas into one dust collection chamber is interrupted during the removal work for one dust collection chamber and the amount of gas introduced into another dust collection chamber increases, An excessive load may be applied or gas treatment may be insufficient.

  The present invention was developed to solve the technical problem, and can effectively regenerate the filter cloth provided in the bag filter device without imposing an excessive burden on the bag filter device. An object of the present invention is to provide a novel filter cloth recycling method and a bag filter device.

In the filter cloth regeneration method of the present invention, soot and dust contained in the combustion gas transported from the combustion gas generation source to the dust collection chamber through the flue is filtered and collected by the filter cloth arranged in the dust collection chamber. A method of reclaiming filter cloth in a bag filter device, wherein the bag filter device includes a plurality of dust collection chambers, filter cloths arranged in each dust collection chamber, and smoke that guides combustion gas to each dust collection chamber. Any one of a plurality of introduction pipes formed by branching the downstream side of the road into a plurality of parts, a removal means for removing dust collected on the filter cloth, and the introduction pipes arranged in the flue comprising: a drug injection nozzle drug injection direction is made changeable so as to be able to inject the drug towards or, a valve body for adjusting the combustion gas introduction amount of the drug is entrained into the inlet tube, the using those were made, during the process of combustion gases, disposed in the dust collecting chamber When it is necessary to regenerate the filter cloth, the removing means removes the dust collected in the filter cloth arranged in one of the plurality of dust collecting chambers by the removing means. And a first medicine injection step of injecting medicine from the medicine injection nozzle with the medicine injection direction of the medicine injection nozzle directed to one introduction pipe for introducing combustion gas into one dust collection chamber By carrying out the above, after protecting the filter cloth arranged in one dust collection chamber with chemicals, the dust collected on the filter cloth arranged in one dust collection chamber is removed, An introduction amount adjusting step for reducing the amount of combustion gas introduced into another introduction pipe other than the one introduction pipe for introducing combustion gas into the one dust collection chamber with a valve body, and a chemical directed to the one introduction pipe by executing the second agent injection process for injecting the medicament from the injection nozzle, the one of the dust collecting chamber Preferentially by introducing the agent, the agent layer is formed against the filter cloth arranged on the dust collecting chamber of the one, have been reproduces filter cloth arranged on one of the dust collecting chamber, then successively , Select another dust collection chamber from other dust collection chambers other than one dust collection chamber, and for another selected dust collection chamber,
After performing the said withdrawal process and the said 1st chemical | medical agent injection process in parallel, it is distribute | arranged in each dust collection chamber by performing the said introduction amount adjustment process and the said 2nd chemical | medical agent injection process. The filter cloth is sequentially regenerated (hereinafter referred to as the method of the present invention).

  In the method of the present invention, it is preferable that in the first drug injection step, the drug is injected at a drug injection amount of 5 to 20% of the drug injection amount injected per unit time in the second drug injection step. It becomes.

In the method of the present invention, in the introduction amount adjusting step, the combustion gas introduction amount against to each other inlet pipe, to the combustion gas introducing amount into one inlet pipe, and is the preferred embodiment be reduced to 3 percent Become.

The bag filter device of the present invention is a bag filter that filters and collects soot contained in combustion gas transported from a combustion gas generation source through a flue into a dust collection chamber with a filter cloth disposed in the dust collection chamber. A plurality of dust collection chambers, filter cloths arranged in each dust collection chamber, and a downstream of the flue for introducing combustion gas from the lower side of each dust collection chamber toward each dust collection chamber A plurality of inlet pipes formed by branching a plurality of sides, a discharge pipe for discharging the clean gas that has passed through the filter cloth from the upper side of each dust collecting chamber, and dust collected on the filter cloth is removed. A dispensation means, a medicine injection nozzle arranged in the flue, the medicine injection direction being changeable so that the medicine can be injected toward any of the introduction pipes, and the introduction pipe a valve body for adjusting the combustion gas introduction amount of the drug is entrained into, and the flue A differential pressure gauge for measuring the pressure differential between the serial discharge pipe, it was provided a control unit, wherein the control unit, during the process of combustion gases, the pressure difference measured by the differential pressure gauge is above a certain value When receiving a signal indicating that it has become, an instruction is given to the dusting means to dust off dust collected on the filter cloth disposed in one dust collecting chamber, and the chemical injection nozzle On the other hand, the direction of medicine injection is directed to one introduction pipe for introducing combustion gas into one dust collection chamber, and a command to inject medicine from the medicine injection nozzle is given. After the passage of time, the valve body is instructed to reduce the amount of combustion gas introduced into other introduction pipes other than one introduction pipe for introducing combustion gas into the one dust collection chamber, and the chemical agent By giving an instruction to the spray nozzle to spray the medicine, After the filter cloth arranged in the dust collection chamber is regenerated, the filter cloth arranged in the dust collection chamber other than the one dust collection chamber is successively regenerated in the same procedure. (Hereinafter referred to as the device of the present invention).

  In the device according to the present invention, it is preferable that the introduction pipe is formed by bifurcating the downstream side of the flue, and the valve body is a damper provided at a branch point of the flue. Become.

  ADVANTAGE OF THE INVENTION According to this invention, the filter cloth with which the bag filter apparatus was equipped can be reproduced | regenerated effectively, without putting an excessive burden on a bag filter apparatus.

FIG. 1 is a schematic view of the apparatus of the present invention. FIG. 2 is a flowchart showing the logical operation of the control unit in the apparatus of the present invention. 3 (a) to 3 (e) are explanatory views showing stepwise how the method of the present invention is executed in the device of the present invention.

  Hereinafter, although an embodiment of the present invention is described based on a drawing, the present invention is not limited to this embodiment.

FIG. 1 shows a schematic diagram of a device 1 of the present invention in which the method of the present invention is implemented. The apparatus 1 of the present invention is arranged in the dust collection chamber 2 for soot contained in the combustion gas transported into the dust collection chamber 2 through a flue 9 from a gas generation source (not shown) such as an incinerator. This is a dust collecting device (bug filter device) that filters and collects with the filter cloth 3.

The device 1 of the present invention includes two adjacent dust collection chambers (first dust collection chamber 2A, second dust collection chamber 2B) 2, filter cloth 3 disposed in each dust collection chamber 2A, 2B, and each dust collection chamber. chamber 2A, each dust collecting chamber 2A from the lower side of 2B, inlet tube for introducing the combustion gases towards the inside 2B (first introduction pipe 4A, the second introduction pipe 4B) and 4, cleaned passing through the filter cloth 3 Disposed in the flue 9 is a discharge pipe 5 for discharging gas from the upper side of each dust collection chamber 2A, 2B, a dusting means 6 for dusting off the dust collected on the filter cloth 3. The medicine injection nozzle 71, the valve body 8 that adjusts the amount of gas introduced into each of the introduction pipes 4 </ b> A and 4 </ b> B, and the control unit 10 are provided.

  The dust collection chambers 2A and 2B are divided into two chambers, the first dust collection chamber 2A and the second dust collection chamber 2B, by a partition plate 200 that partitions the inside of the dust collection tower 20. Each of the dust collection chambers 2A and 2B includes a filtration chamber 21, a hopper chamber 22 common to the dust collection chambers 2A and 2B, which is provided below the filtration chamber 21, and an upper portion of the filtration chamber 21. And a clean gas chamber 23 common to the dust collection chambers 2A and 2B.

The filter cloth 3 is arranged in a suspended state in the filtration chamber 21 in each of the dust collection chambers 2A and 2B. More specifically, the filter cloth 3 is formed by forming a cloth base material such as a woven cloth or a non-woven cloth into a bag shape, and the filtering cloth 3 is opened with the mouth portion of the bag opened to the clean gas chamber 23. It is suspended in the chamber 21. Accordingly, the combustion gas introduced into the filtration chamber 21 passes from the surface of the filter cloth 3 formed in a bag shape toward the inside of the bag and is guided to the clean gas chamber 23 through the mouth of the bag. . The dust contained in the combustion gas is collected by filtration when passing from the surface of the filter cloth 3 formed in a bag shape toward the inside of the bag.

The introduction pipes 4A and 4B are formed by branching the downstream side of the flue 9 into two branches. Accordingly, the combustion gas transported through the flue 9 (for example, combustion gas containing acidic harmful gas and soot and dust) is led to the flue branch point 91 existing downstream of the flue 9 and the flue branch point. It flows into each of the dust collecting chambers 2A and 2B via each of the introduction pipes 4A and 4B branched into two branches by 91.

The exhaust pipe 5 is attached in a state of communicating with the clean gas chamber 23. Therefore, the passes through the filter cloth 3, purifying gas led to the clean gas chamber 23 is discharged is led to a chimney (not shown) through the discharge pipe 5. The exhaust pipe 5 is provided with a concentration meter CM for measuring the acid gas concentration in the clean gas passing through the exhaust pipe 5. The discharge pipe 5 is provided with a differential pressure gauge PM for measuring a differential pressure between the flue 9 and the discharge pipe 5, that is, a pressure loss of the entire device 1 of the present invention.

  The pay-off means 6 is disposed in the clean gas chamber 23. In the present embodiment, a pulse jet system that removes a dust layer formed on the surface of the filter cloth 3 by jetting compressed air is employed as the wiping-off means 6. More specifically, the wiping means 6 injects compressed air toward the inside of the filter cloth 3 formed in a bag shape, and allows the compressed air to pass from the inside of the filter cloth 3 to the outside. The dust layer formed on the surface of the filter cloth 3 is blown off (backwashed). Note that the dust removed from the surface of the filter cloth 3 falls to the hopper chamber 22.

  The medicine injection nozzle 71 includes a medicine storage tank 72 that stores medicine (for example, slaked lime), a carry-out device 73 that draws out the medicine, a transport device 74 that transports the medicine, and a medicine supply pipe 75. It is arranged at the downstream end of the device 7 and injects the medicine stored in the medicine storage tank 72 toward one of the introduction pipes 4A and 4B. The medicine injection nozzle 71 can change the medicine injection direction so that the medicine can be injected toward one of the introduction pipes 4A and 4B.

  The valve body 8 is a movable damper. The valve body 8 is attached to the flue branch point 91 where the flue 9 is bifurcated, and one introduction pipe (for example, a first introduction pipe) selected from the two introduction pipes 4A and 4B. By tilting toward the side of the pipe 4A), the inlet of the flow path of one introduction pipe 4A is narrowed.

  The controller 10 is connected to the densitometer CM, the differential pressure gauge PM, the withdrawal means 6, the medicine supply device 7, and the valve body 8. The control unit 10 receives signals transmitted from the measuring instruments CM and PM, and gives predetermined instructions to the withdrawal means 6, the medicine supply device 7, and the valve body 8.

  More specifically, the control unit 10 repeats the logical operation based on the flowchart shown in FIG. 2, thereby operating the withdrawal means 6, the medicine supply device 7, and the valve body 8 as shown in FIG. 3. Thus, the method of the present invention is executed. Hereinafter, the state of control by the control unit 10 and the method of the present invention will be described with reference to the flowchart of FIG. 2 and FIGS. 3 (a) to 3 (e).

FIG. 3A is a diagram showing an operating state of the device 1 of the present invention at normal times. At this time, the valve body 8 is in a neutral position where none of the introduction pipes 4A and 4B is narrowed. Thus, the combustion gas transported through the flue 9 is divided into two substantially equal parts at the flue branching point 91, and enters the dust collection chambers 2A and 2B through the introduction pipes 4A and 4B, respectively. Led. The dust contained in the combustion gas introduced into each of the dust collection chambers 2A and 2B is collected by filtration when passing through the filter cloth 3 and is deposited on the surface of the filter cloth 3. The clean gas that has passed through the filter cloth 3 moves into the clean gas chamber 23 and is discharged through the discharge pipe 5.

  During the normal operation of the device 1 of the present invention, the control unit 10 constantly monitors the value of the differential pressure gauge PM (S1). When the value of the differential pressure gauge PM becomes equal to or greater than a predetermined value, the controller 10 directs the medicine injection nozzle 71 toward the first introduction pipe 4A as shown in FIG. 3B (S2). ) While performing the first medicine injection process for injecting medicine from the medicine injection nozzle 71 (S3), the withdrawal process for operating the withdrawal means 6 is executed (S4).

In the wiping-off step, the wiping-off means 6 blows compressed air from the clean gas chamber 23 side toward the filter cloth 3 arranged in the first dust collecting chamber 2A, and the surface of the filter cloth 3 Remove the dust layer deposited on the surface. At this time, since the valve body 8 remains in a neutral position where none of the introduction pipes 4A and 4B is narrowed, the first dust collection chamber 2A has almost the same amount of combustion as that during normal operation. Although gas is continuously introduced, since the first chemical injection step is performed in parallel with the pay-off step, the acidic gas contained in the combustion gas is neutralized by the chemical. Thereby, the filter cloth 3 disposed in the first dust collecting chamber 2A is protected during execution of the wiping-off process. In addition, since the said 1st chemical | medical agent injection process is not performed in order to form the precoat of a chemical | medical agent on the surface of the said filter cloth 3, the injection quantity of the chemical | medical agent in the said 1st chemical | medical agent injection process is the said filter cloth 3. Any amount sufficient to protect is sufficient. Specifically, in the step of forming a precoat of the drug on the surface of the filter cloth 3 to be described later (second drug injection step), the drug injection amount is 5 to 20% of the drug injection amount injected per unit time. Spray medicine.

After a predetermined time has elapsed after the operation of the dropping means 6 (S5), the control unit 10 tilts the valve body 8 toward the second introduction pipe 4B as shown in FIG. The flow rate on the inlet side of the second introduction pipe 4B is narrowed (S6), thereby reducing the introduction amount of the combustion gas introduced into the second dust collecting chamber 2B through the second introduction pipe 4B. Execute the process.

In the introduction amount adjusting step, the introduction amount is introduced into the second dust collection chamber 2B in order to avoid applying an excessive load to the first dust collection chamber 2A in which the introduction amount of the combustion gas increases as much as possible. introduction amount of the combustion gas to be found to the introduction amount of the combustion gas introduced into the first collecting dust chamber 2A, it is preferable to be 1 to 3 percent decrease. The amount of combustion gas introduced can be increased or decreased by adjusting the degree of narrowing of the flow path by the valve body 8. Usually, the degree of narrowing of the flow path by the valve body 8 is 1/3 to 2/3.

  After the execution of the introduction amount adjustment step, the control unit 10 causes the medicine injection nozzle 71 to generate a relatively large amount of medicine (5 to 20 times the medicine injection amount injected per unit time in the first medicine injection step). A second medicine injection step of injecting is performed (S7).

As described above, by performing the introduction amount adjusting step, the amount of introduction of the combustion gas introduced into the second dust collection chamber 2B is reduced, so that the first dust collection chamber 2A is passed through the first introduction pipe 4A. The amount of combustion gas introduced into the gas increases. Thus, the medicine sprayed from the medicine spray nozzle 71 is preferentially introduced into the first dust collection chamber 2A, and a precoat layer is formed on the surface of the filter cloth 3 disposed in the first dust collection chamber 2A. (Corresponding to the “drug layer” in the claims).

  After a predetermined time has elapsed after the execution of the second medicine injection step (S8), the control unit 10 returns the valve body 8 to the neutral position (S9), and then sequentially executes S10 to S16. That is, this time, the filter cloth 3 disposed in the second dust collection chamber 2B is regenerated (see FIGS. 3D to 3E).

In the present embodiment, while the apparatus 1 of the present invention is in operation, the control unit 10 constantly monitors the value of the differential pressure gauge PM (S1), but at the same time, clean gas passing through the exhaust pipe 5 The value of the concentration meter CM that measures the acid gas concentration in the inside is also monitored (S17). That the value of the densitometer CM is equal to or greater than a certain value means that the neutralizing ability of the precoat layer formed on the surface of the filter cloth 3 has decreased.

  Then, when the value of the densitometer CM is equal to or greater than a predetermined value, the control unit 10 directs the medicine injection nozzle 71 toward the first introduction pipe 4A (S18), and supplies the medicine from the medicine injection nozzle 71. Inject (S19).

The injected chemical is introduced into the first dust collecting chamber 2A while being entrained by the combustion gas, and the surface of the filter cloth 3 (to be precise, the dust layer deposited on the surface of the filter cloth 3). A dust layer composed of a mixture of the chemical and the dust contained in the combustion gas is formed on the surface). After a certain period of time has elapsed since the injection of the chemical (S20), the same steps (S21 to S23) are performed on the filter cloth 3 disposed in the second dust collecting chamber 2B, and the chemical and the combustion gas are contained. The dust layer which consists of the mixture of the dust contained in is formed. Thereafter, the control unit 10 confirms again whether or not the acid gas concentration has become a certain value or less (S17). That is, this process is repeated until the neutralizing ability for the acid gas is restored.

The device 1 of the present invention that executes the method of the present invention has the above-described configuration and executes the first chemical injection step in parallel with the payout step. Therefore, the acidic gas contained in the combustion gas is caused by the chemical. Neutralized. Thereby, the filter cloth 3 is protected during execution of the pay-off process.

Further, when the precoat layer is formed on the surface of the filter cloth 3, the introduction amount adjusting step is executed to reduce the introduction amount of the combustion gas introduced into the second dust collection chamber 2B. Since the introduction amount of the combustion gas introduced into the first dust collection chamber 2A through the one introduction pipe 4A is increased, the chemical injected from the chemical injection nozzle 71 is preferentially given to the first dust collection chamber 2A. The precoat layer is efficiently formed on the surface of the filter cloth 3 disposed in the first dust collection chamber 2A.

Furthermore, when the filter cloth 3 disposed in one dust collection chamber (for example, the first dust collection chamber 2A) is regenerated, combustion gas is continuously introduced into the one dust collection chamber 2A. Thus, during the regeneration of the filter cloth 3 disposed in one dust collection chamber 2A, the amount of combustion gas introduced into another dust collection chamber (for example, the second dust collection chamber 2B) does not increase. Thus, an excessive load is applied to the other dust collection chamber 2B, and the processing of the combustion gas is preferably prevented from being insufficient.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

The present invention can be suitably used as, for example, an apparatus for filtering and collecting combustion gas discharged from an incineration processing facility or the like.

DESCRIPTION OF SYMBOLS 1 Invention apparatus 2 Dust collection chamber 2A First dust collection chamber 2B Second dust collection chamber 21 Filtration chamber 22 Hopper chamber 23 Clean gas chamber 3 Filter cloth 4 Introduction pipe 4A First introduction pipe 4B Second introduction pipe 5 Discharge pipe 6 Dispensing means 7 Drug supply device 71 Drug injection nozzle 72 Drug storage tank 73 Transport device 74 Transport device 75 Drug transport pipe 8 Valve body 9 Flue 91 Flue branch point 10 Control unit 20 Dust collector 200 Partition plate CM Concentration meter PM Differential pressure gauge

Claims (5)

A filter cloth regeneration method in a bag filter device that collects soot and dust contained in combustion gas transported from a combustion gas generation source through a flue into a dust collection chamber using a filter cloth disposed in the dust collection chamber. There,
As the bug filter device,
Multiple dust collection chambers;
A filter cloth arranged in each dust collection chamber;
A plurality of introduction pipes formed by branching the downstream side of the flue into a plurality of branches to guide the combustion gas to each dust collection chamber;
A dusting means for dusting off the dust collected on the filter cloth;
A medicine injection nozzle arranged in the flue and capable of changing the medicine injection direction so that the medicine can be injected toward any of the introduction pipes;
A valve body for adjusting the amount of combustion gas introduced along with the chemical into the introduction pipe;
Use what comprises
When it is necessary to regenerate the filter cloth placed in each dust collection chamber during the treatment of the combustion gas,
In the dusting means, a dusting step of dusting off the dust collected on the filter cloth arranged in one dust collecting chamber of the plurality of dust collecting chambers;
A first medicine injection step of injecting a medicine from the medicine injection nozzle after directing the medicine injection direction of the medicine injection nozzle to one introduction pipe for introducing combustion gas into one dust collection chamber;
By removing the dust collected on the filter cloth arranged in one dust collection chamber while protecting the filter cloth arranged in one dust collection chamber with chemicals by executing in parallel ,
An introduction amount adjusting step for reducing the amount of combustion gas introduced into another introduction pipe other than the one introduction pipe for introducing the combustion gas into the one dust collection chamber in the valve body;
A second medicine injection step of injecting a medicine from a medicine injection nozzle directed to the one introduction pipe ;
Is performed to preferentially introduce the drug into one dust collection chamber, form a drug layer on the filter cloth disposed in the one dust collection chamber, and thus, into the one dust collection chamber. Recycle the arranged filter cloth,
Then, sequentially select another dust collection chamber from other dust collection chambers other than one dust collection chamber,
For another selected dust chamber,
The withdrawal step, the first medicine injection step,
In parallel,
The introduction amount adjustment step, the second medicine injection step,
By running
A method for regenerating a filter cloth, comprising sequentially regenerating the filter cloth disposed in each dust collection chamber. In the regeneration method of the filter cloth according to claim 1,
In the first drug injection step, the filter cloth regeneration method in which the drug is injected at a drug injection amount of 5 to 20% of the drug injection amount injected per unit time in the second drug injection step. In the regeneration method of the filter cloth of Claim 1 or 2,
Wherein the introduction amount adjusting step, the combustion gas introduction amount against to each other inlet pipe, to the combustion gas introducing amount into one inlet pipe, filter cloth regeneration method of reducing 1-3 percent. A bag filter device that filters and collects soot contained in combustion gas transported from a combustion gas generation source through a flue into a dust collection chamber with a filter cloth disposed in the dust collection chamber,
Multiple dust collection chambers;
A filter cloth arranged in each dust collection chamber;
Introducing a combustion gas from the lower side of each dust collection chamber toward each dust collection chamber, a plurality of introduction pipes formed by branching a plurality of downstream sides of the flue,
A discharge pipe for discharging the clean gas that has passed through the filter cloth from the upper side of each dust collection chamber;
A dusting means for dusting off the dust collected on the filter cloth;
A medicine injection nozzle arranged in the flue and capable of changing the medicine injection direction so that the medicine can be injected toward any of the introduction pipes;
A valve body for adjusting the amount of combustion gas introduced along with the chemical into the introduction pipe;
A differential pressure gauge for measuring a differential pressure between the flue and the discharge pipe;
A control unit;
Comprising
When the control unit receives a signal indicating that the differential pressure measured by the differential pressure gauge has reached a certain value or more during the processing of the combustion gas, the control unit distributes to the dust collection chamber in one dust collection chamber. A command to remove dust collected on the filter cloth is given, and the chemical injection direction of the chemical injection nozzle is directed to one introduction pipe for introducing combustion gas into one dust collection chamber. In order to inject the medicine from the medicine injection nozzle,
After a predetermined time has elapsed after the start of the dropping step, the amount of combustion gas introduced into other introduction pipes other than one introduction pipe for introducing combustion gas into the one dust collection chamber is reduced with respect to the valve body. After regenerating the filter cloth arranged in the one dust collection chamber by giving a command to spray the drug to the drug spray nozzle and giving the command,
A bag filter device characterized by performing control to successively regenerate filter cloths arranged in other dust collection chambers other than one dust collection chamber in the same procedure. The bug filter device according to claim 4,
The introduction pipe is formed by bifurcating the downstream side of the flue;
A bag filter device, wherein the valve body is a damper provided at a branch point of the flue.

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