JP6978345B2 - Denitration catalyst polishing device and denitration catalyst polishing method - Google Patents

Description

The present invention relates to a denitration catalyst polishing device and a denitration catalyst polishing method for polishing a denitration catalyst used in a denitration device such as a thermal power plant.

At thermal power plants, nitrogen oxides are generated as coal burns. Due to regulations such as the Air Pollution Control Act, it is necessary to keep such nitrogen oxide emissions below a certain level. For this reason, thermal power plants are equipped with a denitration device for reducing and decomposing nitrogen oxides. The denitration device is filled with a denitration catalyst, and by coexisting with ammonia (gas), a reduction reaction is exhibited at a high temperature.
It is necessary to recover the performance of the denitration catalyst because its performance deteriorates as it continues to be used. Polishing regeneration is one of the catalyst regeneration technologies. Polishing regeneration is a method of recovering catalyst performance by polishing the surface of the denitration catalyst and scraping out a new catalyst surface (see, for example, Patent Document 1).

Polishing regeneration is a very effective method because the performance can be restored without changing the physical properties of the denitration catalyst. However, when polishing the deposits from the denitration catalyst, if the polishing amount is too large, the denitration catalyst may be polished and the denitration catalyst may be damaged. Further, if the amount of polishing is too small, sufficient polishing and regeneration cannot be performed.
Therefore, conventionally, when polishing a denitration catalyst with a denitration catalyst polishing device, an operator takes out the denitration catalyst at predetermined time intervals and measures the weight to grasp the polishing amount (see, for example, Patent Document 2). ..

Japanese Unexamined Patent Publication No. 1-119343 Japanese Unexamined Patent Publication No. 2011-104581

However, it is time-consuming and inefficient if the operator takes out the denitration catalyst and measures the weight at predetermined time intervals in order to properly polish the deposits.

An object of the present invention is to provide a denitration catalyst polishing apparatus and a denitration catalyst polishing method capable of appropriately and efficiently polishing deposits from a denitration catalyst.

The present invention is a denitration catalyst polishing device for polishing the deposits adhering to the inner surface of the through holes in a denitration catalyst provided with a plurality of through holes extending in the longitudinal direction, and the polishing material for polishing the deposits is used. An abrasive material supply device for supplying the denitration catalyst to the through hole, and a weight detecting unit capable of detecting the weight of the denitration catalyst while the abrasive material is being supplied to the through hole by the abrasive material supply device. It is a denitration catalyst polishing device provided.

It is preferable to include a control unit that stops the operation of the denitration catalyst polishing device when the weight of the denitration catalyst detected by the weight detection unit becomes a predetermined weight or less.

The abrasive material supply device is provided with an abrasive material supply amount measuring unit provided between the abrasive material supply device and the denitration catalyst, and an abrasive material replenishment unit attached to the abrasive material supply device, and the control unit is the abrasive material. When the amount of abrasive material supplied measured by the supply amount measuring unit is equal to or less than a predetermined supply amount, the abrasive material replenishing unit may replenish the abrasive material to the abrasive material supply device.

On the downstream side of the denitration catalyst, a cyclone that separates the abrasive from the air containing the abrasive after polishing the denitration catalyst, and the cyclone and the abrasive supply device are connected and separated from the cyclone. The abrasive hose that sends the abrasive material to the abrasive material supply device and the abrasive material flow rate measuring unit provided in the abrasive material hose are provided, and the control unit is measured by the abrasive material flow rate measuring unit. The amount of the abrasive material to be replenished to the abrasive material supply device from the abrasive material replenishing unit may be adjusted based on the flow rate of the abrasive material.

The denitration catalyst is sandwiched between an upstream fixing member and a downstream fixing member through which the abrasive can be distributed, and a differential pressure measuring unit is provided between the upstream fixing member and the downstream fixing member, and the control unit is provided. When the differential pressure between the upstream fixing member and the downstream fixing member measured by the differential pressure measuring unit becomes equal to or less than a predetermined differential pressure, the operation of the denitration catalyst polishing device may be stopped. ..

Further, the present invention is a denitration catalyst polishing method for polishing the deposits adhering to the inner surface of the through holes in a denitration catalyst provided with a plurality of through holes extending in the longitudinal direction, wherein the polishing material for polishing the deposits is used. The weight of the denitration catalyst is detected while supplying the through hole of the denitration catalyst, and when the detected weight of the denitration catalyst becomes a predetermined weight or less, the polishing material is transferred to the denitration catalyst. This is a denitration catalyst polishing method that stops the supply.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a denitration catalyst polishing apparatus and a denitration catalyst polishing method capable of appropriately and efficiently polishing deposits from a denitration catalyst.

It is a block diagram of the coal-fired power generation facility 100 in which the denitration catalyst as a regeneration target is used in the denitration catalyst polishing apparatus of embodiment. It is a figure which shows the structural example of the denitration device 160. It is a figure which shows the schematic structure of the denitration catalyst polishing apparatus 1 used for polishing regeneration of the denitration catalyst 622 of this embodiment. This is an enlarged surface of a main part of the denitration catalyst polishing device 1.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a coal-fired power generation facility 100 in which a denitration catalyst as a regeneration target is used in the denitration catalyst polishing apparatus according to the embodiment of the present invention.

As shown in FIG. 1, the coal-fired power generation facility 100 includes a coal bunker 120, a coal feeder 125, a pulverized coal machine 130, a combustion boiler 140, and an exhaust passage 150 provided on the downstream side of the combustion boiler 140. , Denitration device 160 provided in this exhaust passage 150, air preheater 170, electrostatic dust collector 190, gas heater (for heat recovery) 180, induction blower 210, desulfurization device 220, gas heater (for reheating) 230, desulfurization. It is equipped with a blower 240 and a chimney 250.

The coal bunker 120 stores coal supplied by a coal carrier from a coal silo (not shown). The coal feeder 125 supplies the coal supplied from the coal bunker 120 to the pulverized coal machine 130 at a predetermined supply speed.
The pulverized coal machine 130 crushes the coal supplied from the coal feeder 125 to produce pulverized coal. In the pulverized coal machine 130, coal is pulverized to an average particle size of 60 μm to 80 μm. The particle size distribution of the pulverized coal is 10 to 15% for 150 μm or more, 30 to 40% for 75 μm to 150 μm, and 45 to 60% for less than 75 μm.
As the pulverized coal machine 130, a roller mill, a tube mill, a ball mill, a beater mill, an impeller mill and the like are used.

The combustion boiler 140 burns the pulverized coal supplied from the pulverized coal machine 130 together with the forcedly supplied air. Combustion of pulverized coal produces coal ash such as clinker ash and fly ash, and also generates exhaust gas.
The clinker ash refers to the lumpy coal ash that has fallen to the bottom of the combustion boiler 140 among the coal ash generated when the pulverized coal is burned. In addition, fly ash is a coal ash generated when pulverized coal is burned, and has a particle size (particle size of about 200 μm or less) that is blown up together with combustion gas (exhaust gas) and flows to the exhaust passage 150 side. Spherical coal ash.

The exhaust passage 150 is arranged on the downstream side of the combustion boiler 140, and circulates the exhaust gas generated in the combustion boiler 140 and the generated coal ash. As described above, the exhaust passage 150 includes a denitration device 160, an air preheater 170, a gas heater (for heat recovery) 180, an electrostatic precipitator 190, an attracting ventilator 210, a desulfurization device 220, and a gas heater (for reheating). ) 230, a desulfurization ventilator 240, and a chimney 250 are arranged.

The denitration device 160 removes nitrogen oxides in the exhaust gas, which will be described later. In the present embodiment, the denitration device 160 injects ammonia gas as a reducing agent into the exhaust gas at a relatively high temperature (300 ° C to 400 ° C), and by acting with the denitration catalyst, the nitrogen oxides in the exhaust gas are converted into harmless nitrogen. Nitrogen oxides in the exhaust gas are removed by the so-called dry ammonia catalytic reduction method, which decomposes into water vapor.

The air preheater 170 is arranged on the downstream side of the denitration device 160 in the exhaust passage 150. The air preheater 170 exchanges heat between the exhaust gas that has passed through the denitration device 160 and the combustion air sent from the push-in type ventilator 75, cools the exhaust gas, and heats the combustion air.

The gas heater 180 is arranged on the downstream side of the air preheater 170 in the exhaust passage 150. The exhaust gas recovered by the air preheater 170 is supplied to the gas heater 180. The gas heater 180 further recovers heat from the exhaust gas.

The electrostatic precipitator 190 is arranged on the downstream side of the gas heater 180 in the exhaust passage 150. The exhaust gas recovered by heat in the gas heater 180 is supplied to the electrostatic precipitator 190. The electrostatic precipitator 190 is a device that collects coal ash (fly ash) in the exhaust gas by applying a voltage to the electrodes. The fly ash collected by the electrostatic precipitator 190 is collected by the fly ash recovery device 126.

The attract ventilator 210 is arranged on the downstream side of the electrostatic precipitator 190 in the exhaust passage 150. The attraction ventilator 210 takes in the exhaust gas from which the fly ash has been removed in the electrostatic precipitator 190 from the primary side and sends it out to the secondary side.

The desulfurization device 220 is arranged on the downstream side of the induction ventilator 210 in the exhaust passage 150. The exhaust gas sent out from the induction ventilator 210 is supplied to the desulfurization apparatus 220. The desulfurization apparatus 220 sprays a mixed solution of limestone and water onto the exhaust gas to absorb the sulfur oxides contained in the exhaust gas into the mixed solution to generate a desulfurized gypsum slurry, and dehydrates the desulfurized gypsum slurry. This produces desulfurized gypsum. The desulfurization gypsum produced in the desulfurization device 220 is recovered by the desulfurization gypsum recovery device 222 connected to this device.

The gas heater 230 is arranged on the downstream side of the desulfurization device 220 in the exhaust passage 150. Exhaust gas from which sulfur oxides have been removed in the desulfurization apparatus 220 is supplied to the gas heater 230. The gas heater 230 heats the exhaust gas. The gas heater 180 and the gas heater 230 are between the exhaust gas flowing between the air preheater 170 and the electrostatic precipitator 190 and the exhaust gas flowing between the desulfurization device 220 and the desulfurization ventilator 240 in the exhaust passage 150. It may be configured as a gas heater that exchanges heat with.

The desulfurization ventilator 240 is arranged on the downstream side of the gas heater 230 in the exhaust passage 150. The desulfurization ventilator 240 takes in the exhaust gas heated in the gas heater 230 from the primary side and sends it out to the secondary side.
The chimney 250 is arranged on the downstream side of the desulfurization ventilator 240 in the exhaust passage 150. Exhaust gas heated by the gas heater 230 is introduced into the chimney 250. The chimney 250 emits exhaust gas.

FIG. 2 shows a configuration example of the denitration device 160.
As shown in FIG. 2, the denitration device 160 includes a denitration reactor 61 and a plurality of stages of denitration catalyst layers 62 arranged inside the denitration reactor 61.

The denitration reactor 61 serves as a field for the denitration reaction in the denitration device 160.
As shown in FIG. 2, the denitration catalyst layer 62 includes, for example, a plurality of honeycomb-type denitration catalysts 622.

The denitration catalyst 622 is formed in a long shape (rectangular parallelepiped shape) in which a plurality of through holes 624 extending in the longitudinal direction are formed. The plurality of denitration catalysts 622 are arranged so that the extending direction of the through hole 624 is along the flow path of the exhaust gas. In the present embodiment, the plurality of denitration catalysts 622 are arranged inside the denitration reactor 61 in a state of being housed in the casing 621. In the figure, 622A is the outlet side end of the exhaust gas.

The performance of the denitration catalyst 622 in the denitration device 160 used in the above-mentioned coal-fired power generation facility 100 deteriorates as the use is continued. Therefore, it is necessary to recover the performance. Polishing regeneration is performed as a method for recovering performance. Polishing regeneration is a method of recovering catalyst performance by polishing the catalyst surface to remove deposits and scraping out a new catalyst surface.

FIG. 3 shows a schematic configuration of the denitration catalyst polishing apparatus 1 used for polishing and regeneration of the denitration catalyst 622 of the present embodiment. Further, FIG. 4 shows an enlarged view of a main part of the denitration catalyst polishing apparatus 1.
The denitration catalyst polishing device 1 includes an upstream connecting member 30, an upstream fixing member 10, a denitration catalyst 622, a downstream fixing member 20, and a downstream, in order from the abrasive supply device 40 arranged at the upstream end of the air flow. The side connecting member 60, the cyclone 70, the transport pipe 72, the bag filter 80, the connecting pipe 81, the suction fan 95, and the abrasive hose 48 connected to the abrasive material supply device 40 from the lower part of the cyclone 70. , Equipped with.

Further, the denitration catalyst polishing device 1 includes an abrasive material supply amount measuring unit 201 provided on the upstream connecting member 30, a differential pressure measuring unit 202 provided between the upstream fixing member 10 and the downstream fixing member 20. It includes a flow meter 203 provided on the abrasive hose 48, an abrasive replenishing unit 204 provided on the abrasive supply device 40, and a control unit 200 for controlling each of these units.

The polishing material supply device 40 is a device that supplies the polishing material A for polishing the denitration catalyst 622, and its lower portion is connected to the upstream end of the upstream side connecting member 30. An abrasive hose 48 extending from the lower end of the cyclone 70 is connected to the abrasive supply device 40.
Further, an abrasive material replenishing unit 204 is arranged above the abrasive material supply device 40. The abrasive material replenishing unit 204 is provided with a valve (not shown) that can be opened and closed, and the valve can be opened and closed under the control of the control unit 200, which will be described later, to replenish the abrasive material A to the abrasive material supply device 40. It has become.

An abrasive material supply amount measuring unit 201 is provided in the middle of the upstream connecting member 30. The abrasive material supply amount measuring unit 201 is, for example, a laser densitometer, and automatically measures the flow rate of the abrasive material A flowing through the upstream connecting member 30 while the abrasive material supply device 40 is supplying the abrasive material A, and measures the flow rate thereof. The measurement result is sent to the control unit 200.

The downstream end of the upstream connecting member 30 is connected to the upstream end of the upstream fixing member 10. The upstream fixing member 10 has a larger cross-sectional area from the upstream end toward the downstream end. That is, the upstream fixing member 10 has a tapered shape in which the cross-sectional area increases from the upstream side connecting member 30 side toward the downstream side holding the denitration catalyst 622.

The upstream end of the denitration catalyst 622 is held on the downstream end side of the upstream fixing member 10, and the downstream end of the denitration catalyst 622 is held on the upstream end side of the downstream fixing member 20. In the denitration catalyst 622, the gas outlet side end portion 622A, which was arranged in the coal-fired power generation facility 100, is arranged so as to be on the upstream end side.
The periphery of the denitration catalyst 622 is guarded in four directions by plastic or the like so as not to absorb moisture.

Here, the upstream fixing member 10 holds the denitration catalyst 622 so that the upstream end of the denitration catalyst 622 is arranged on the upper surface of the upstream fixing member 10, and the weight of the denitration catalyst 622 is added to the upper surface of the upstream fixing member 10. ing. The upstream fixing member 10 can measure the weight of the denitration catalyst 622 added to the upper surface in this way, and also functions as a weight detection unit.
The detection result of the weight of the denitration catalyst 622 measured by the upstream fixing member 10 is sent to the control unit 200.

The downstream fixing member 20 has a smaller cross-sectional area from the upstream end holding the denitration catalyst 622 to the downstream end. That is, the downstream fixing member 20 has a tapered shape in which the cross-sectional area becomes smaller from the denitration catalyst 622 side to the downstream connecting member 60 side.
In the present embodiment, the cross-sectional shape of each flow path of the upstream fixing member 10 and the downstream fixing member 20 is rectangular, but the cross-sectional shape is not limited to this and may be circular or may differ depending on the portion.

Further, a differential pressure measuring unit 202 is arranged in parallel with the denitration catalyst 622 between the upstream fixing member 10 and the downstream fixing member 20. The differential pressure measuring unit 202 measures the differential pressure between the pressure of the air flowing through the upstream fixing member 10 and the pressure of the air flowing through the downstream fixing member 20.
The measured value of the differential pressure measured by the differential pressure measuring unit 202 is sent to the control unit 200.

A cyclone 70 is connected to the downstream end of the downstream connecting member 60. The cyclone 70 is a known cyclone classifier, and is arranged at a position higher than the abrasive material supply device 40.
A transport pipe 72 is connected to the downstream side of the cyclone 70, and a bag filter 80 is connected to the downstream end of the transport pipe 72.
Further, the lower portion of the cyclone 70 is connected to the abrasive material supply device 40 via the abrasive material hose 48.

The cyclone 70 separates the air conveyed from the upstream side into the abrasive A and the air containing dust. The separated abrasive material A falls and accumulates on the lower part of the cyclone 70 due to its own weight, and is supplied to the abrasive material supply device 40 again via the abrasive material hose 48.
At this time, the cyclone 70 side of the abrasive hose 48 is at a higher position than the abrasive material supply device 40 side of the abrasive hose 48. Therefore, when the abrasive material is supplied to the abrasive material supply device 40, the abrasive material A can be sufficiently supplied even if the suction force of the abrasive material supply device 40 is small.
Further, an abrasive material flow rate measuring unit 203 is arranged in the middle of the abrasive material hose 48. The abrasive material flow rate measuring unit 203 measures the flow rate of the abrasive material A returning from the cyclone 70 to the abrasive material supply device 40.
The measurement result of the abrasive material A flowing through the abrasive material flow rate measuring unit 203 is sent to the control unit 200.

The bag filter 80 is a known dust collector. The bag filter 80 collects dust in the air including dust. The collected dust is stored in a storage unit (not shown) provided at the bottom and collected at a desired timing.

The upstream end of the connecting pipe 81 is connected to the downstream side of the bag filter 80, and the downstream end of the connecting pipe 81 is connected to the suction fan 95. The clean air that has passed through the bag filter 80 and has dust removed is sucked by the suction fan 95 and discharged into the atmosphere through the exhaust duct 90.

Here, the denitration catalyst 622 arranged in the denitration catalyst polishing apparatus 1 of the present embodiment is a used one, and deposits such as coal ash adhere to the inner wall of the through hole 624. The denitration catalyst 622 may be clogged by this deposit. In such a case, it is preferable to displace the denitration catalyst 622 in the denitration catalyst polishing device 1 after opening the closed portion by washing with water or the like in advance. .. Further, since the denitration catalyst 622 is porous and easily absorbs water, a drying step may be provided, and by providing the drying step, the accuracy of weight measurement described later can be improved.

When the denitration catalyst 622 is sandwiched between the upstream fixing member 10 and the downstream fixing member 20, the denitration catalyst 622 has the exhaust gas outlet side end portion 622A in the coal-fired power generation facility 100 shown in FIG. 1 as described above. , Arranged on the inlet side (upstream side) of the abrasive material A in the abrasive material supply device 40.

The reason is as follows.
At the time of denitration in the coal-fired power generation facility 100, the denitration catalyst 622 has more deposits on the inlet side (upstream side) of the exhaust gas.
On the other hand, since the abrasive material supply device 40 of the present embodiment sucks air (and the abrasive material A) to generate an air flow instead of blowing air, the abrasive material A flowing through the denitration catalyst 622 is on the outlet side (downstream side). ) Is faster and has a higher polishing effect.
Therefore, in the present embodiment, the denitration catalyst 622 is set between the upstream fixing member 10 and the downstream fixing member 20 with the outlet side end portion 622A at the time of denitration in the coal-fired power generation facility 100 on the upstream side.

Next, a method of regenerating the denitration catalyst 622 by the denitration catalyst polishing apparatus 1 will be described.
First, the denitration catalyst 622 is removed from the denitration device 160 used in the coal-fired power generation facility 100. At this time, as described above, the denitration catalyst 622 often has more deposits on the exhaust gas inlet side end than on the outlet side end 622A.

The denitration catalyst 622 is held between the upstream fixing member 10 and the downstream fixing member 20. At this time, the outlet side end portion 622A is arranged on the inlet side (upstream side) of the air in the abrasive material supply device 40.

When the operation of the denitration catalyst polishing device 1 is started, the suction fan 95 starts the operation, and the suction of air from the abrasive material supply device 40 is started. The abrasive material A is supplied to the upstream connecting member 30 from the inside of the abrasive material supply device 40. The abrasive A is supplied to the denitration catalyst 622 through the upstream connecting member 30 and the upstream fixing member 10.

Here, the abrasive material supply amount measuring unit 201 provided in the middle of the upstream side connecting member 30 automatically starts measuring the flow rate of the abrasive material A flowing through the upstream side connecting member 30 by the operation of the denitration catalyst polishing device 1. Then, the measurement result is sent to the control unit 200.
When the flow rate of the abrasive material A measured by the abrasive material supply amount measuring unit 201 becomes less than a predetermined flow rate, the control unit 200 opens the valve of the abrasive material replenishing unit 204 and causes the abrasive material from the abrasive material supply device 40. Replenish A. Then, when the flow rate of the abrasive material A measured by the abrasive material supply amount measuring unit 201 becomes equal to or higher than a predetermined flow rate, the valve of the abrasive material replenishing unit 204 is closed and the abrasive material A is supplied to the abrasive material supply device 40. Stop supply.
Here, the predetermined flow rate is the lower limit of the flow rate of the polishing material A capable of achieving a desired polishing rate in the denitration catalyst 622.
In this case, the control unit 200 takes into account the flow rate of the abrasive material A returning from the cyclone 70 to the abrasive material supply device 40, which is measured by the abrasive material flow rate measuring unit 203 provided in the middle of the abrasive material hose 48. The amount of the abrasive material A supplied to the abrasive material supply device 40 may be determined.

Further, the upstream fixing member 10 automatically measures the weight of the denitration catalyst 622 by the operation of the denitration catalyst polishing device 1, and sends the measurement result to the control unit 200. When the weight of the denitration catalyst 622 measured by the upstream fixing member 10 becomes a predetermined weight or less, the control unit 200 stops the operation of the denitration catalyst polishing device 1. That is, the supply of the abrasive material by the abrasive material supply device 40 and the suction of air by the suction fan 95 are stopped, and the operations of the cyclone 70 and the bag filter 80 are also stopped (1).
Here, the predetermined weight is the weight when the deposits are necessary and sufficiently removed from the denitration catalyst 622, and is, for example, a weight reduced by about 12% from the weight at the start of polishing. Therefore, the case where the weight of the denitration catalyst 622 measured by the upstream fixing member 10 is equal to or less than a predetermined weight is the case where the removal of deposits from the denitration catalyst 622 is completed.

Further, in the control unit 200, when the differential pressure between the pressure of the air flowing through the upstream fixing member 10 and the pressure of the air flowing through the downstream fixing member 20 detected by the differential pressure measuring unit 202 becomes equal to or less than a predetermined differential pressure. Also, the operation of the denitration catalyst polishing device 1 is stopped (2).
Here, the predetermined differential pressure is the differential pressure when the deposits are necessary and sufficiently removed from the denitration catalyst 622 and the air flow in the through hole 624 is improved. Therefore, when the differential pressure between the pressure of the air flowing through the upstream fixing member 10 and the pressure of the air flowing through the downstream fixing member 20 is equal to or less than the predetermined differential pressure, the removal of the deposits from the denitration catalyst 622 is completed. If you do.

Here, the operation of the denitration catalyst polishing device 1 by the control unit 200 is stopped when the weight of the denitration catalyst 622 measured by the above (1) upstream fixing member 10 is equal to or less than a predetermined weight (2). ) Satisfies both the case where the differential pressure between the pressure of the air flowing through the upstream fixing member 10 and the pressure of the air flowing through the downstream fixing member 20 detected by the differential pressure measuring unit 202 is equal to or less than a predetermined differential pressure. It may be a case, or it may be a case where either one is satisfied.

As described above, according to the denitration catalyst polishing apparatus 1 of the present embodiment, as described above, the upstream fixing member 10 measures the weight of the denitration catalyst 622, sends the measurement result to the control unit 200, and the control unit 200 controls the denitration catalyst 622. When the weight of the denitration catalyst polishing device 1 becomes less than a predetermined weight, the operation of the denitration catalyst polishing device 1 is stopped.
Therefore, the denitration catalyst 622 is not polished more than necessary, and it is possible to prevent insufficient polishing.

The weight measurement by the upstream fixing member 10 is automatically performed when the denitration catalyst polishing device 1 is operated, and it is not necessary to stop the denitration catalyst polishing device 1 and take out the denitration catalyst 622 to measure the weight. The denitration catalyst 622 can be efficiently polished.
In the present embodiment, the polishing amount of the denitration catalyst 622 is detected by measuring the weight, but the polishing amount is not limited to this, and the polishing amount is determined by measuring the film thickness of the through hole 624 of the denitration catalyst 622, for example, by using a laser or the like. It may be detected. In this case, for example, the polishing is finished when the film thickness is reduced by about 100 μm.

Further, the abrasive material supply amount measuring unit 201 automatically measures the flow rate of the abrasive material A flowing through the upstream connecting member 30 when the denitration catalyst polishing device 1 is operated, and the control unit 200 measures the flow rate of the abrasive material A. When the flow rate becomes less than the predetermined flow rate, the valve of the abrasive material replenishing unit 204 is opened, and the abrasive material A is replenished from the abrasive material supply device 40.
Therefore, since the flow rate of the polishing material A is automatically adjusted to the optimum flow rate, the denitration catalyst 622 can always be polished under the optimum polishing conditions.

The abrasive material A becomes finer due to crushing or the like during polishing, and the amount recovered from the cyclone 70 through the abrasive material hose 48 decreases. However, according to the present embodiment, the abrasive material hose 48 Since the abrasive material flow rate measuring unit 203 is arranged, it is possible to check the recovered amount of the abrasive material A.

Further, the upstream fixing member 10 has a tapered shape in which the cross-sectional area increases from the upstream side connecting member 30 side toward the denitration catalyst 622. Therefore, the flow velocity of the abrasive A slows down when flowing into the denitration catalyst 622, so that wear is further reduced.

In the present embodiment, since the abrasive A is supplied into the denitration catalyst 622 by sucking air with the suction fan 95, the denitration catalyst 622 is compared with the case where air is sent from the upstream side of the abrasive supply device 40, for example. The impact of the collision of the abrasive when entering is mitigated.

In the denitration catalyst 622, the amount of deposits is large on the exhaust gas inlet side of the denitration catalyst 622 as described above. In the present embodiment, the gas inlet side of the denitration catalyst 622 is arranged on the outlet side of the abrasive in the denitration catalyst 622. In the denitration catalyst polishing apparatus 1 of the present embodiment, the polishing material A flowing through the denitration catalyst 622 has a high speed on the polishing material outlet side and a high polishing effect. Therefore, since the polishing effect on the side of the denitration catalyst 622 having a large amount of deposits is high, the deposits can be efficiently polished.

As described above, according to the method for regenerating the denitration catalyst 622 of the embodiment, it is possible to suppress the wear of the denitration catalyst 622 even if the flow velocity of the airflow containing the abrasive A is increased in order to shorten the polishing time. Therefore, efficient polishing can be performed.

1 Abrasive denitration catalyst polishing device 10 Upstream fixing member 20 Downstream fixing member 30 Upstream side connecting member 40 Abrasive material supply device 48 Abrasive material hose 60 Downstream side connecting member 61 Denitration reactor 62 Denitration catalyst layer 70 Cyclone 72 Conveyance pipe 80 Bug filter 81 Connection Pipe 90 Exhaust duct 95 Suction fan 100 Coal-fired power generation equipment 200 Control unit 201 Abrasive supply amount measurement unit 202 Abrasive pressure measurement unit 203 Abrasive material flow rate measurement unit 204 Abrasive material replenishment unit 621 Casing 622 Denitration catalyst 622A Exit side end 624 Penetration Hole

Claims (6)

A denitration catalyst polishing device for polishing deposits adhering to the inner surface of the through holes in a denitration catalyst provided with a plurality of through holes extending in the longitudinal direction.
An abrasive material supply device that supplies an abrasive material for polishing the deposits to the through hole of the denitration catalyst, and an abrasive material supply device.
A weight detector capable of detecting the weight of the denitration catalyst while the abrasive material is being supplied to the through hole by the abrasive material supply device.
A denitration catalyst polishing device equipped with. A control unit for stopping the operation of the denitration catalyst polishing device when the weight of the denitration catalyst detected by the weight detection unit becomes a predetermined weight or less is provided.
The denitration catalyst polishing apparatus according to claim 1. An abrasive material supply amount measuring unit provided between the abrasive material supply device and the denitration catalyst,
The abrasive material replenishment unit attached to the abrasive material supply device is provided.
The control unit replenishes the abrasive material to the abrasive material supply device from the abrasive material replenishment unit when the abrasive material supply amount measured by the abrasive material supply amount measuring unit becomes equal to or less than a predetermined supply amount. ,
The denitration catalyst polishing apparatus according to claim 2. On the downstream side of the denitration catalyst, a cyclone that separates the abrasive from the air containing the abrasive after polishing the denitration catalyst,
An abrasive hose that connects the cyclone and the abrasive supply device and sends the abrasive material separated from the cyclone to the abrasive material supply device.
A polishing material flow rate measuring unit provided on the polishing material hose is provided.
The control unit adjusts the amount of the abrasive material to be replenished from the abrasive material replenishing unit to the abrasive material supply device based on the flow rate of the abrasive material measured by the abrasive material flow rate measuring unit.
The denitration catalyst polishing apparatus according to claim 3. The denitration catalyst is sandwiched between an upstream fixing member and a downstream fixing member through which the abrasive can be distributed.
A differential pressure measuring unit is provided between the upstream fixing member and the downstream fixing member.
The control unit stops the operation of the denitration catalyst polishing device when the differential pressure between the upstream fixing member and the downstream fixing member measured by the differential pressure measuring unit becomes equal to or less than a predetermined differential pressure. do,
The denitration catalyst polishing apparatus according to any one of claims 2 to 4. A denitration catalyst polishing method for polishing deposits adhering to the inner surface of the through holes in a denitration catalyst provided with a plurality of through holes extending in the longitudinal direction.
The weight of the denitration catalyst is detected while supplying the polishing material for polishing the deposits to the through holes of the denitration catalyst.
When the detected weight of the denitration catalyst becomes a predetermined weight or less, the supply of the abrasive to the denitration catalyst is stopped.
Denitration catalyst polishing method.

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