JP2014085196A - Method and apparatus for collecting dust - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an exchange time of a filter arranged on a dust collecting apparatus to be identified while collecting dust and thereby securing an amount of dust necessary for measuring concentration.SOLUTION: A dust collecting apparatus 14 having therein a filter 18 is arranged to a sampling tube 12. A flow regulating valve 20, a suction pump 22 to collect exhaust gas e and a gas meter 24 to measure an exhaust gas flow rate are arranged downstream of the dust collecting apparatus 14. Also, a differential pressure detector 26 to measure differential pressure in an exhaust gas passage between an upstream side and a downstream side of the filter 18 is arranged on the sample tube 12. A control device 28 controls a movement of the flow regulating valve 20 and operation of the suction pump 22 on the basis of measurement values of the differential pressure detector 26 and the gas meter 24. Before sampling the exhaust gas e, a map showing a relation between the differential pressure and an amount of dust collected is created by performing an experiment using exhaust gas simulating a characteristic of the exhaust gas e. Then, an optimal region A of the amount of dust collected is estimated on the basis of the differential pressure measured by the differential pressure detector 26 and the map.

Description

  The present invention relates to a dust collection method and apparatus used for measuring dust concentration in exhaust gas in a flue, a duct or the like.

JIS Z 8808 (filter paper weight method) is applied to the measurement of the dust concentration in the exhaust gas. In this method, a suction nozzle is disposed in the exhaust gas flow path, the exhaust gas is sucked at a constant speed, and the exhaust gas is passed through a dust collector disposed inside or outside the flue. The dust collector is provided with a filter paper, and the dust concentration is obtained by calculation from the weight of the dust collected on the filter paper and the amount of exhaust gas sucked at the same time. With this method, the amount of dust collected on the filter paper is defined as about 0.5 mg per 1 cm ² of the collection area with a circular filter paper, and the total amount of dust collected with a cylindrical filter paper is defined as 5 mg or more. .

  In the JIS method, since the amount of dust collected on the filter paper cannot be confirmed during measurement, the judgment of the dust collection end time is determined from the collection time or the like. Alternatively, the replacement time of the filter paper is often determined empirically from the decrease in the suction gas flow rate (gas suction speed) during dust collection due to pressure loss when exhaust gas passes through the filter paper.

  The dust concentration measuring device disclosed in Patent Document 1 sucks exhaust gas at a constant flow rate while measuring the amount of sucked gas with a gas meter, sets a fixed sampling time as a guide for replacement time, and uses this sampling time to collect dust. The collection amount is estimated and the replacement time is estimated.

Japanese Patent Laid-Open No. 07-146227

  As described above, in the dust collecting apparatus of the JIS method and Patent Document 1, the filter paper replacement time is determined after a certain sampling time has elapsed or is determined empirically. Therefore, when the amount of dust in the exhaust gas is originally small, the amount of dust collected by the taken out filter paper may be smaller than expected. As a result, there is a problem that an error in weighing the filter paper becomes large and an accurate dust concentration cannot be measured. Moreover, since filter paper is manually replaced after dust collection, a plurality of filter papers cannot be automatically replaced and continuously measured. In particular, when the fluctuation of the dust concentration in the exhaust gas is severe, it is difficult to determine an appropriate replacement time.

  In view of the problems of the prior art, the present invention makes it possible to grasp the replacement time of the filter paper arranged in the dust collector for collecting dust even when the amount of dust in the exhaust gas varies, and is necessary for concentration measurement. The purpose is to secure a sufficient amount of dust collection.

  In order to achieve the above object, the dust collecting method of the present invention first collects dust by passing a simulated exhaust gas simulated by the properties of the exhaust gas to be dust collected through the filter paper, and between the upstream and downstream of the filter paper. A differential pressure of the exhaust gas flow is detected, and a map showing the relationship between the differential pressure and the amount of dust collected on the filter paper is created (first step). Thus, the relationship between the upstream and downstream differential pressure caused by pressure loss when the simulated exhaust gas passes through the filter paper and the amount of dust collected on the filter paper is grasped.

  Next, exhaust gas is collected from the exhaust gas flow path to be collected, and the exhaust gas is passed through a filter paper having the same material, shape and thickness as the filter paper used when creating the map, and dust is collected. (Second step). During this time, the differential pressure between the upstream and downstream of the filter paper is monitored, and the amount of dust collected on the filter paper is estimated from the differential pressure and the map. When the amount of collected dust on the filter paper reaches the set amount, the collection of the exhaust gas is stopped and the filter paper is taken out (third step). As the set amount, an optimum amount that can measure the dust concentration and does not cause breakage of the filter paper is selected. As a result, the amount of dust collected can be accurately estimated even during sampling, so the time for replacing the filter paper can be accurately estimated, and the amount of dust collected necessary for measuring the dust concentration can be secured.

  In the method of the present invention, the dust collection in the first step and the dust collection in the second step may be performed under the condition that the flow rate of the exhaust gas passing through the filter paper is the same. This makes it possible to accurately estimate the amount of dust collected from the map.

  The dust collecting apparatus of the present invention that can be directly used for carrying out the method of the present invention has a sampling port disposed in the exhaust gas flow path, a sampling tube for sampling a part of the exhaust gas, and the exhaust gas from the sampling port into the sampling tube. A suction pump for suction, a dust collector having a filter paper provided in a sampling pipe and having an exhaust gas channel formed therein and arranged to shield the exhaust gas channel, and an exhaust gas flow between upstream and downstream of the filter paper The differential pressure detector that detects the differential pressure between the filter paper and the simulated exhaust gas that simulates the properties of the exhaust gas is passed through a filter paper having the same material, shape and thickness as the filter paper, and between the exhaust gas flow upstream and downstream of the filter paper There is a map that determines the relationship between the differential pressure and the amount of dust collected at the time of the differential pressure, and a storage unit that stores the map. From the detected value and map of the differential pressure detector, the dust at the time of filter paper replacement Obtain the collected amount, and when the dust collected amount reaches the set amount, The and a control device for stopping.

  In such a configuration, during sampling of the exhaust gas, the differential pressure between the upstream and downstream of the filter paper is monitored, and the amount of dust collected on the filter paper is obtained from the differential pressure and the map by the control device. Here, when the dust collection amount of the filter paper reaches the set amount, collection of the exhaust gas is stopped and the filter paper is taken out. As a result, the amount of collected dust can be accurately estimated during sampling, so the replacement time of the filter paper can be accurately estimated, and the amount of collected dust necessary for measuring the dust concentration can be secured.

  The apparatus of the present invention further includes a turntable in which a plurality of fitting holes into which the filter paper can be fitted are arranged at a position equidistant from the rotation center, and a drive device for the turntable, and the dust collector housing includes: The two housing parts are configured to be separated from each other, and the filter paper fitted in the fitting hole of the turntable is inserted between the two housing parts. It is preferable that the inside of the dust collector can be sealed. As a result, the exchange of the filter paper is facilitated, and the dust can be continuously collected with a plurality of filter papers.

  There are combustion devices that use exhaust gas as fuel gas. The combustion equipment is, for example, a gas turbine plant that uses blast furnace gas or coke oven gas as fuel gas. In such a combustion device, a dust collector or further cleaning facility is provided in the exhaust gas supply path for supplying exhaust gas to the combustion device, and after removing and cleaning the exhaust gas, the exhaust gas is supplied to the combustion device, and the combustion device is clogged with dust and damages to parts. It is necessary to prevent the occurrence of the above. However, when the exhaust gas properties and flow rate fluctuate drastically, the concentration of the dust contained in the exhaust gas also fluctuates, so clogging by dust and damage to members are likely to occur in the combustion equipment.

  In such a case, the present invention device may be provided in the exhaust gas supply path between the combustion device, the dust collector, and the cleaning device. The apparatus of the present invention can appropriately determine the replacement time of the filter paper even when the exhaust gas properties and flow rate fluctuate greatly, and can secure the dust collection amount necessary for measuring the dust concentration. In addition, by controlling the dust collection capacity of the dust collector and the cleaning capacity of the cleaning device according to the dust concentration obtained from the amount of dust collected by the device of the present invention, clogging and damage to the members that occur in combustion equipment are prevented. And stable operation of combustion equipment can be continued.

  According to the present invention, even when there is a fluctuation in the amount of dust in the exhaust gas, the dust collection amount necessary for concentration measurement is determined by appropriately determining the replacement time of the filter paper arranged in the dust collector for dust collection. Can be secured.

1 is a front cross-sectional view of a dust collection device according to a first embodiment of a method and a device of the present invention. It is a map which shows the relationship between the differential pressure | voltage and dust collection amount based on 1st Embodiment. It is a front view of the dust sampling device which concerns on 2nd Embodiment of this invention method and this invention apparatus. It is a perspective view which shows a part of dust collection apparatus which concerns on 2nd Embodiment. It is a systematic diagram of the gas turbine which provided the present invention device.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(Embodiment 1)
An embodiment of the method and the device of the present invention will be described with reference to FIGS. FIG. 1 shows the overall configuration of a dust sampling apparatus 10A according to this embodiment. A flue s through which the exhaust gas e flows in the direction of the arrow is formed inside the partition wall 32 constituting a flue duct or the like. The collection tube 12 is inserted into the flue through a through hole 32 a provided in the partition wall 32, and the collection tube 12 is fixed to the partition wall 32. The tip nozzle opening 12a of the sampling tube 12 is directed in the flow direction of the exhaust gas e in the flue s.

  A dust collector 14 is provided in the sampling tube 12. In the dust collector 14, an exhaust gas passage having a cross-section enlarged from the exhaust gas passage formed in the sampling tube 12 is formed. The dust collector 14 has a filter paper holder 16 for fixing the filter paper 18. The filter paper 18 has a circular plate shape and is fixed by a filter paper holder 16 at a position facing the exhaust gas flow path. A flow rate adjusting valve 20 is provided in the sampling tube 12 downstream of the dust collector 14, and a suction pump 22 is provided in the sampling tube 12 downstream of the flow rate adjusting valve 20.

  A gas meter 24 for measuring the exhaust gas flow rate is connected to the sampling pipe 12 further downstream of the suction pump 22. Further, a differential pressure detector 26 for measuring the differential pressure of the exhaust gas flowing through the sampling pipe 12 upstream and downstream of the dust collector 14 is provided. As the differential pressure detector 26, for example, a pressure sensor can be used. The measured values of the differential pressure detector 26 and the gas meter 24 are sent to the control device 28, and the control device 28 operates the flow rate adjusting valve 20 and the suction pump 22 based on the measured values of the differential pressure detector 26 and the gas meter 24. Control the operation.

  In such a configuration, the suction pump 22 is operated with the flow rate adjustment valve 20 opened, and the exhaust gas e is collected from the tip nozzle opening 12a. The flow rate of the exhaust gas e flowing through the sampling tube 12 is measured by a gas meter 24. The flow rate of the exhaust gas e flowing through the sampling tube 12 is controlled by the suction pump 22 and the flow rate adjustment valve 20 according to a command from the control device 28.

  Before sampling the exhaust gas e, an experiment using the exhaust gas simulated by the properties of the exhaust gas e is performed to acquire data. In this experiment, a filter paper having the same material, shape and thickness as the filter paper 18 is used, and the differential pressure between the upstream and downstream of the filter paper due to the pressure loss of the pseudo exhaust gas passing through the filter paper is obtained. A map showing the relationship between the amount of collected dust on the filter paper and the differential pressure is created from the data thus obtained. In this case, the suction flow rate of the exhaust gas e by the suction pump 22 is maintained at a constant speed, and is the same as the suction flow rate (suction flow rate) when the exhaust gas e is actually sucked. An example of the map created in this way is shown in FIG. This map is stored in the storage unit 30 of the control device 28.

  The relationship between the differential pressure before and after the filter paper and the amount of dust collected on the filter paper is confirmed from the map of FIG. As a result, it is possible to confirm the optimum dust collection amount region A in which the filter paper is not damaged and the dust concentration can be measured, and the differential pressure corresponding to the optimum region A. For example, when the differential pressure is about 2 kPa, the optimum dust collection amount (about 15 mg) can be collected, and the dust concentration can be calculated from the suction exhaust gas amount measured by the gas meter 24.

  Next, the exhaust gas e is sampled. In this case, the flow rate adjusting valve 20 and the suction pump 22 are controlled by the control device 28, and the suction flow rate of the exhaust gas e flowing through the sampling tube 12 is controlled at a constant speed. Further, the suction flow rate (suction flow rate) is the same as that at the time of map creation. When the differential pressure indicated by the differential pressure detector 26 becomes a differential pressure corresponding to the optimum region A of the amount of dust collected, the control device 28 stops the operation of the suction pump 22 and ends the sampling.

  According to the present embodiment, the dust collection amount of the filter paper 18 can be accurately estimated even during the collection of the exhaust gas e, so that the replacement time of the filter paper 18 can be accurately grasped. Therefore, it is possible to secure a dust collection amount necessary for measuring the dust concentration. Further, when the dust collection amount reaches the optimum region A, the suction pump 22 can be automatically stopped by the control device 28, so that the operator does not make an erroneous stop timing. Further, since the suction speed of exhaust gas is made constant by sampling at the time of map creation and sampling of exhaust gas e, the flow of exhaust gas e inside the sampling tube 12 can be stabilized. Furthermore, since the same suction flow rate is used when creating the map and when sampling the exhaust gas e, it is possible to create an accurate map in which the dust collection amount does not differ from the dust collection amount of the exhaust gas e.

(Embodiment 2)
Next, a second embodiment of the method and the device of the present invention will be described with reference to FIGS. In FIG. 3, the exhaust gas e flows in the flue duct 76 in the direction of the arrow. In the dust collecting apparatus 10B of the present embodiment, the tip of the collecting pipe 40 is inserted into the flue duct 76, and the tip nozzle opening 40a of the collecting pipe 40 is directed in a direction opposite to the flow direction of the exhaust gas e. . The other end of the sampling tube 40 is connected to a dust collector 42. The housing of the dust collector 42 is constituted by two separate housing members 42a and 42b.

  The flange 44a of the housing member 42a and the flange 44b of the housing 42b are in positions facing each other. The interval between both flanges can be made variable by an air cylinder 60 described later. The sampling tube 40 is connected to a housing member 42a, and a pipe 46 having the same inner diameter as the sampling tube 40 is connected to the housing member 42b. The sampling pipe 40 is provided with a flow rate adjustment valve 48, and the pipe 46 is provided with a flow rate adjustment valve 50, a suction pump 52, and a gas meter 54 in order from the upstream side. The exhaust gas e is sucked into the sampling tube 40 by the suction pump 52, and the flow rate of the exhaust gas e flowing through the pipe 46 is measured by the gas meter 54.

  The housing member 42 a is supported by the support 58 via the flange 44 a, and the support 58 is erected on the base 56. An air cylinder 60 is fixed to the support column 58, and a piston 60a of the air cylinder 60 is coupled to the flange 44b. The distance between the flange 44a and the flange 44b can be adjusted by the vertical movement of the piston 60a. Another support 62 is erected on the base 56 next to the support 58. Bearings 64 are attached to the upper and lower portions of the column 62, and a drive motor 66 is fixed to the column 62 below the lower bearing 64. An output shaft 66 a of the drive motor 66 is rotatably supported by the bearing 64.

  As shown in FIG. 4, the upper end of the output shaft 66 a is coupled to the center of the lower surface of the turntable 68. In the outer peripheral area of the turntable 68, eight circular fitting holes 68a are provided in the circumferential direction. A circular filter paper 70 can be freely detachably fitted in each fitting hole 68a. The outer peripheral edge region of the turntable 68 provided with the fitting hole 68a is disposed so as to be insertable between the flanges 44a and 44b. By rotating the turntable 68 with the drive motor 66, a plurality of filter papers 70 loosely fitted in the fitting holes 68a can be sequentially disposed between the flanges 44a and 44b. In a state where one filter paper 70 is disposed between the flanges 44a and 44b, the inside of the dust collector 42 can be kept airtight. A seal member may be inserted between the flanges 44a and 44b if necessary to keep it airtight.

  Further, a differential pressure detector 72 is provided for measuring a differential pressure between the pressure of the exhaust gas flow path in the sampling tube 40 and the pressure of the exhaust gas flow path in the pipe 46. The measured values of the gas meter 54 and the differential pressure detector 72 are input to the control device 74, and the control device 74 adjusts the opening of the flow rate adjusting valves 48 and 50 based on these measured values, and the suction pump 52, The operation of the air cylinder 60 and the drive motor 66 is controlled.

  In such a configuration, with the filter paper 70 inserted into the dust collector 42, the suction pump 52 is operated to collect the exhaust gas e from the collection pipe 42 into the collection pipe 42. A differential pressure detector 72 measures the differential pressure before and after the filter paper 70, that is, the differential pressure between the exhaust gas pressure in the collection pipe 42 and the exhaust gas pressure in the pipe 46. Also in the present embodiment, the map shown in FIG. 2 is created in advance as in the first embodiment. The map is stored in a storage unit (not shown) of the control device 74. Therefore, the amount of dust collected by the filter paper 70 can be estimated from the measured value of the differential pressure detector 72 and the map.

  When replacing the filter paper 70, the air cylinder 60 is driven to lower the housing member 42b, the interval between the flanges 44a and 44b is widened, the turntable 68 is rotated, and the adjacent filter paper 70 is moved between the flanges 44a and 44b. To place. Thereafter, the housing member 42b is raised, and the flanges 44a and 44b are sandwiched around the upper and lower surfaces of the filter paper 70. As a result, another filter paper 70 can be disposed in the exhaust gas passage formed inside the dust collector 42 and the inside of the dust collector 42 can be sealed.

  According to the present embodiment, the same effect as the first embodiment can be obtained, and when the dust collection amount of one filter paper 70 reaches the optimum region A, the housing member 42b is lowered by the control device 74. At the same time, a new filter paper 70 can be exchanged by rotating the turntable 68. Therefore, the replacement of the filter paper becomes easy and the replacement speed of the filter paper can be increased, so that the interruption time of the exhaust gas collection when the filter paper is replaced can be shortened. Therefore, dust can be collected continuously with a plurality of filter papers.

(Embodiment 3)
Next, FIG. 5 demonstrates 3rd Embodiment which applied this invention method and this invention apparatus to the gas turbine combined plant which uses blast furnace gas and coke oven gas as fuel gas. In FIG. 5, a fuel gas line 86 connects the gas line 82 through which the blast furnace gas BFG flows and the gas compressor 84 of the gas turbine combined plant 80. A mixer 88 is provided in the fuel gas line 86, and a gas line 90 that supplies the coke oven gas COG is connected to the mixer 88. A blower 92 is provided in the gas line 90, and the coke oven gas COG is supplied to the fuel gas line 86 by the blower 92. The blast furnace gas BFG and the coke oven gas COG are mixed by the mixer 88 and sent to the gas compressor 84 as fuel gas.

  A wet electric dust collector 94 is provided in the fuel gas line 86 downstream of the mixer 88, and the fuel gas is removed by the wet electric dust collector 94. A dust collecting device 100 according to the first embodiment is provided downstream of the wet electrostatic precipitator 94. The dust collection device 100 includes a control device 74 as in the second embodiment. The turbine shaft 98 is connected to a steam turbine 102, a generator 104, and a compressor 108 and a turbine 110 that constitute a gas turbine 106. The rotation of the turbine shaft 98 is transmitted to the gas compressor 84 with the speed increasing gear 96 increasing the rotation speed.

  The fuel gas compressed by the gas compressor 84 is sent to the combustor 112 of the gas turbine 106 via the line 114, but a part is sent to the gas cooler 116 from the line 114. The fuel gas sent to the gas cooler 116 is cooled by the gas cooler 116 and then sent to the fuel gas line 86 between the mixer 88 and the wet electrostatic precipitator 94 via the line 118 to cool the fuel gas. .

  The exhaust gas after driving the turbine 110 is sent from the line 115 to the exhaust heat recovery boiler 120. The steam after being used to drive the steam turbine 102 is sent from the line 122 to the condenser 124 by the condensate pump 126, and is sent to the exhaust heat recovery boiler 120 as condensed water. Some high-pressure steam that is not used to drive the steam turbine 102 is also sent from the line 128 to the exhaust heat recovery boiler 120. In the exhaust heat recovery boiler 120, the condensed water and the high-pressure steam are reheated by the retained heat of the exhaust gas. The steam generated in the exhaust heat recovery boiler 120 is divided into a high pressure line 130, an intermediate pressure line 132 and a low pressure line 134 according to the pressure, and is returned to the steam turbine 102 to drive the steam turbine 102. The exhaust gas discharged from the exhaust heat recovery boiler 120 is released from the chimney 136.

  The mixed gas of the blast furnace gas BFG and the coke oven gas COG supplied from the fuel gas line 86 to the gas compressor 84 has a large variation in gas properties. Further, since the amount of dust contained in the mixed gas is reduced downstream of the wet electrostatic precipitator 94, it may not be possible to obtain a dust collection amount necessary for measuring the dust concentration. Further, since the concentration of dust contained in the mixed gas also fluctuates, the gas compressor 84 may be clogged or the blades of the turbine 110 may be damaged.

  However, by providing the dust collecting apparatus 100 of the present invention, it is possible to appropriately determine the replacement time of the filter paper, and to secure a dust collection amount necessary for measuring the dust concentration. The control device 74 controls the dust collection capacity of the wet electric dust collector 94 according to the dust concentration obtained from the dust amount collected by the dust collecting device 100, thereby controlling the dust amount contained in the fuel gas. it can. Therefore, clogging, damage to members, and the like that occur in the gas turbine combined plant 80 can be prevented, and stable operation can be continued.

  According to the present invention, even when there is a fluctuation in the amount of dust in the exhaust gas, it is possible to grasp the replacement time of the filter paper arranged in the dust collector to collect dust, and the amount of dust collected for concentration measurement can be determined. It can be secured.

10A, 10B, 100 Dust collection device 12, 40 Collection tube 12a, 40a Tip nozzle opening 14, 42 Dust collector 16 Filter paper holder 18, 70 Filter paper 20, 48, 50 Flow rate adjustment valve 22, 52 Suction pump 24, 54 Gas meter 26, 72 Differential pressure detector 28, 74 Control device 30 Storage unit 32 Partition 32a Through hole 42a, 42b Housing member 44a, 44b Flange 46 Piping 56 Base 58, 62 Post 60 Air cylinder 60a Piston 64 Bearing 66 Drive motor 66a Output Shaft 68 turntable 68a fitting hole 76 flue duct 80 gas turbine combined plant 82,90 gas line 84 gas compressor 86 fuel gas line 88 mixer 92 blower 94 wet electric dust collector 96 speed increasing gear 98 turbine shaft 102 steam turbine Bin 104 Generator 106 Gas turbine 108 Compressor 110 Turbine 112 Combustor 116 Gas cooler 120 Waste heat recovery boiler 124 Condenser 126 Condensate pump 130 High-pressure line 132 Medium-pressure line 134 Low-pressure line 136 Chimney A Optimal region BFG Blast furnace gas COG coke oven gas e exhaust gas s flue

Claims (5)

Dust is collected by passing simulated exhaust gas that simulates the properties of the exhaust gas to be collected through the filter paper, and detects the differential pressure of the exhaust gas flow between the upstream and downstream of the filter paper, and captures the differential pressure and the filter paper. A first step of creating a map showing a relationship with the collected amount of collected dust;
A second step of collecting the exhaust gas from a flow path of the exhaust gas to be collected by dust, collecting the dust by allowing the exhaust gas to pass through a filter paper having the same material, shape and thickness as the filter paper;
While collecting dust in the second step, the differential pressure of the exhaust gas flow between the upstream and downstream of the filter paper is measured, and the amount of dust collected on the filter paper is estimated from the differential pressure and the map. A dust collection method comprising: a third step of stopping collection of exhaust gas when the collection amount reaches a set amount.   The dust collection in the first step and the dust collection in the second step are performed under the same flow rate of exhaust gas passing through the filter paper. How to collect dust. A sampling port is disposed in the exhaust gas flow path, a sampling pipe for sampling a part of the exhaust gas, and a suction pump for sucking the exhaust gas into the sampling pipe from the sampling port;
A dust collector having a filter paper provided in the sampling pipe and having an exhaust gas flow path formed therein, and arranged to shield the exhaust gas flow path;
A differential pressure detector for detecting the differential pressure between the exhaust gas flow upstream and downstream of the filter paper;
The simulated exhaust gas that simulates the properties of the exhaust gas is passed through a filter paper having the same material, shape, and thickness as the filter paper, and the differential pressure between the exhaust gas flow upstream and downstream of the filter paper and the dust at the time of the differential pressure A map to find the relationship with the amount collected,
Having a storage unit storing the map, from the detection value of the differential pressure detector and the map, obtain the dust collection amount at the time of filter paper replacement, when the dust collection amount becomes a set amount, A dust collecting device comprising: a control device for stopping the suction pump. A tene table in which a plurality of fitting holes into which the filter paper can be fitted are arranged at positions equidistant from the rotation center, and a drive device for the tene table;
The housing of the dust collector is composed of two housing members, the two housing members are provided so as to be separated from each other, and the filter paper fitted in the fitting hole of the turntable is the 2 The dust collecting device according to claim 3, wherein the dust collector is configured to be hermetically sealed when inserted between two housing members. Combustion equipment using the exhaust gas as fuel gas;
An exhaust gas supply path for supplying the exhaust gas to the combustion device;
A dust collector provided in the exhaust gas supply path;
The dust collecting device according to claim 3 is provided in the exhaust gas supply path between the combustion device and the dust collector,
A dust collection device characterized in that a dust concentration is obtained from the amount of dust collected by the dust collection device, and the dust collection capacity of the dust collector is controlled according to the dust concentration.

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