JP7464523B2 - Denitrification catalyst polishing method and denitrification catalyst polishing device - Google Patents

Denitrification catalyst polishing method and denitrification catalyst polishing device Download PDF

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JP7464523B2
JP7464523B2 JP2020535145A JP2020535145A JP7464523B2 JP 7464523 B2 JP7464523 B2 JP 7464523B2 JP 2020535145 A JP2020535145 A JP 2020535145A JP 2020535145 A JP2020535145 A JP 2020535145A JP 7464523 B2 JP7464523 B2 JP 7464523B2
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denitration catalyst
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敏和 吉河
和広 吉田
啓一郎 盛田
亨浩 吉岡
展充 伊田
大輔 坂本
広大 日高
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HASHIDA GIKEN INC.
Chugoku Electric Power Co Inc
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Description

本発明は、脱硝触媒を研磨する、脱硝触媒研磨方法及び脱硝触媒研磨装置に関する。 The present invention relates to a method and apparatus for polishing a denitration catalyst.

火力発電所では、石炭燃焼に伴い窒素酸化物が発生する。環境保全のため、窒素酸化物の排出量は一定水準以下に抑える必要がある。このため、火力発電所には窒素酸化物を還元するための脱硝触媒が充てんされた脱硝装置が設置されている。脱硝触媒は、使用の継続に伴い性能が低下する。性能の低下した脱硝触媒を再生する技術の一つとして研磨再生が挙げられる。研磨再生は、性能の低下した脱硝触媒の表面を研磨することで、触媒性能を回復させる技術である。At thermal power plants, nitrogen oxides are generated when coal is burned. To protect the environment, nitrogen oxide emissions must be kept below a certain level. For this reason, thermal power plants are equipped with de-nitration equipment filled with de-nitration catalysts to reduce nitrogen oxides. The performance of de-nitration catalysts deteriorates with continued use. One technique for regenerating de-nitration catalysts with reduced performance is polishing regeneration. Polishing regeneration is a technique that restores catalytic performance by polishing the surface of de-nitration catalysts with reduced performance.

国際公開第２０１４／１５５６２８号International Publication No. 2014/155628

特許文献１には、研磨材（研削材）と気体との混合物を脱硝触媒の貫通孔に通過させて、貫通孔の内壁を研削する脱硝触媒の再生方法に関する技術が開示されている。脱硝触媒からなる被研削部材の一端部には、当該被研削部材の断面積より大きな断面積の拡開部を具備する上流固定部材が連結される。当該拡開部には、スクリーン部材が配置される。このような拡開部内で、研磨材と気体との混合物は流速が低下されると共に分散され、貫通孔の内壁の均一な研削が可能となる。 Patent Document 1 discloses a technique for regenerating a denitration catalyst in which a mixture of an abrasive (grinding material) and gas is passed through the through-holes of the denitration catalyst to grind the inner walls of the through-holes. An upstream fixed member having an expansion section with a cross-sectional area larger than the cross-sectional area of the grinding member made of the denitration catalyst is connected to one end of the grinding member. A screen member is disposed in the expansion section. Within this expansion section, the flow rate of the mixture of abrasive and gas is reduced and dispersed, enabling uniform grinding of the inner walls of the through-holes.

特許文献１に記載された技術は、拡開部内で研磨材と気体との混合物の流速を低下させ、分散させることで貫通孔を均一に研磨できるものであるが、研磨材の流速を低下させれば研磨効率が低下する問題がある。しかし、研磨効率を向上させるため、研磨材の流速を上昇させるのみでは、必ずしも研磨効率の向上に繋がらない場合があった。The technology described in Patent Document 1 reduces the flow rate of the mixture of abrasive and gas within the expanding section and disperses it, thereby enabling the through-holes to be polished uniformly, but there is a problem in that reducing the flow rate of the abrasive reduces the polishing efficiency. However, there are cases in which simply increasing the flow rate of the abrasive in order to improve the polishing efficiency does not necessarily lead to an improvement in the polishing efficiency.

本発明は、上記に鑑みてなされたものであり、脱硝触媒の研磨効率を向上させることができる脱硝触媒研磨方法及び脱硝触媒研磨装置に関する。The present invention has been made in consideration of the above, and relates to a denitration catalyst polishing method and a denitration catalyst polishing apparatus that can improve the polishing efficiency of the denitration catalyst.

本発明は、長手方向に延びる複数の貫通孔が設けられた脱硝触媒の前記貫通孔に、空気と共に研磨材を流通させて、前記貫通孔の内面を研磨する脱硝触媒研磨方法であって、前記脱硝触媒は、前記貫通孔の流路方向が水平面に対して略垂直になるように配置され、前記研磨材は、前記貫通孔の下方から上方に向けて流通し、前記研磨材は、第１の砥粒と、第２の砥粒と、を含み、前記第１の砥粒と、前記第２の砥粒とは、前記貫通孔を流通する速度が異なる、脱硝触媒研磨方法に関する。The present invention relates to a method for polishing a denitration catalyst, in which an abrasive is caused to flow together with air through the through holes of a denitration catalyst having a plurality of through holes extending in the longitudinal direction to polish the inner surfaces of the through holes, the denitration catalyst is arranged so that the flow direction of the through holes is approximately perpendicular to a horizontal plane, the abrasive flows from below to above the through holes, the abrasive includes first abrasive grains and second abrasive grains, and the first abrasive grains and the second abrasive grains flow through the through holes at different speeds.

前記第１の砥粒の平均粒子径Ｄ１は、前記第２の砥粒の平均粒子径Ｄ２よりも大きいことが好ましい。It is preferable that the average particle diameter D1 of the first abrasive grains is larger than the average particle diameter D2 of the second abrasive grains.

前記平均粒子径Ｄ１は、１．６５～２．１６ｍｍであり、前記平均粒子径Ｄ２は０．３０～０．４５ｍｍであることが好ましい。It is preferable that the average particle diameter D1 is 1.65 to 2.16 mm and the average particle diameter D2 is 0.30 to 0.45 mm.

前記第１の砥粒は、前記研磨材中に５～１５重量％含まれることが好ましい。It is preferable that the first abrasive grains are contained in the abrasive material in an amount of 5 to 15% by weight.

前記研磨材の補充工程を有し、前記研磨材の補充工程で補充される前記第１の砥粒は、補充される前記研磨材中に５～２０重量％含まれることが好ましい。It is preferable that the method has a process for replenishing the abrasive material, and that the first abrasive grains replenished in the process for replenishing the abrasive material are contained in an amount of 5 to 20% by weight in the abrasive material being replenished.

また、本発明は、長手方向に延びる複数の貫通孔が設けられた脱硝触媒の前記貫通孔に、空気と共に研磨材を流通させて、前記貫通孔の内面を研磨する脱硝触媒研磨装置であって、前記脱硝触媒の上流側に配置され、研磨材と空気とを混合する混合部と、前記混合部と、前記脱硝触媒とを接続し、前記脱硝触媒の下方から空気と混合された前記研磨材が流入する流入路と、前記脱硝触媒を、前記貫通孔の流路方向が水平面に対して略垂直になるように固定する固定部材と、前記脱硝触媒の下流側に配置され、前記脱硝触媒の上方から空気と共に研磨材を吸引する吸引部と、を有し、前記研磨材は、第１の砥粒と、第２の砥粒と、を含み、前記第１の砥粒と、前記第２の砥粒とは、前記貫通孔を流通する速度が異なる、脱硝触媒研磨装置に関する。The present invention also relates to a denitration catalyst polishing device that polishes the inner surface of a denitration catalyst having a plurality of through holes extending in the longitudinal direction by circulating an abrasive together with air through the through holes, the denitration catalyst having a plurality of through holes extending in the longitudinal direction, the denitration catalyst polishing device comprising: a mixing section that is disposed upstream of the denitration catalyst and mixes the abrasive with air; an inflow passage that connects the mixing section to the denitration catalyst and through which the abrasive mixed with air flows in from below the denitration catalyst; a fixing member that fixes the denitration catalyst so that the flow direction of the through holes is approximately perpendicular to a horizontal plane; and a suction section that is disposed downstream of the denitration catalyst and sucks in the abrasive together with air from above the denitration catalyst, the abrasive including first abrasive grains and second abrasive grains, the first abrasive grains and the second abrasive grains flowing through the through holes at different speeds.

本発明は、脱硝触媒の研磨効率を向上させることができる脱硝触媒研磨方法及び脱硝触媒研磨装置を提供できる。 The present invention provides a denitration catalyst polishing method and a denitration catalyst polishing apparatus that can improve the polishing efficiency of the denitration catalyst.

本実施形態に係る脱硝触媒が使用される火力発電設備の構成図である。1 is a configuration diagram of a thermal power plant in which a denitration catalyst according to an embodiment of the present invention is used. 火力発電設備における脱硝装置の構成例を示す図である。FIG. 1 is a diagram showing an example of the configuration of a denitrification device in a thermal power generation facility. 本実施形態に係る脱硝触媒研磨装置の概略構成図である。1 is a schematic configuration diagram of a denitration catalyst polishing apparatus according to an embodiment of the present invention. 本実施形態に係る脱硝触媒研磨方法を示す模式図である。1 is a schematic diagram showing a method for polishing a denitration catalyst according to an embodiment of the present invention;

以下、本発明の実施形態について説明する。
本発明の実施形態に係る脱硝触媒研磨方法及び脱硝触媒研磨装置の被研磨対象である脱硝触媒は、例えば、以下説明する石炭火力発電設備１００で一定期間使用され、性能の低下した脱硝触媒Ｃである。 Hereinafter, an embodiment of the present invention will be described.
The denitration catalyst to be polished by the denitration catalyst polishing method and denitration catalyst polishing apparatus according to the embodiment of the present invention is, for example, a denitration catalyst C that has been used for a certain period of time in a coal-fired power generation facility 100 described below and has deteriorated in performance.

［石炭火力発電設備］
図１に示すように、石炭火力発電設備１００は、石炭バンカ１１０と、給炭機１１５と、微粉炭機１２０と、微粉炭供給管１３０と、燃焼ボイラ１４０と、燃焼ボイラ１４０の下流側に設けられる排気通路１５０と、この排気通路１５０に設けられる脱硝装置１６０、空気予熱器１７０、熱回収用ガスヒータ１８０、電気集塵装置１９０、誘引通風機２１０、湿式脱硫装置２２０、再加熱用ガスヒータ２３０、脱硫通風機２４０、及び煙突２５０と、を備える。 [Coal-fired power generation facilities]
As shown in FIG. 1, the coal-fired power generation facility 100 includes a coal bunker 110, a coal feeder 115, a coal pulverizer 120, a pulverized coal supply pipe 130, a combustion boiler 140, an exhaust passage 150 provided downstream of the combustion boiler 140, a denitration device 160 provided in the exhaust passage 150, an air preheater 170, a heat recovery gas heater 180, an electrostatic precipitator 190, an induced draft fan 210, a wet desulfurization device 220, a reheat gas heater 230, a desulfurization fan 240, and a chimney 250.

石炭バンカ１１０は、図示しない石炭サイロから運炭設備により供給される石炭を貯蔵する。給炭機１１５は、石炭バンカ１１０から供給される石炭を所定の供給スピードで微粉炭機１２０に供給する。
微粉炭機１２０は、給炭機１１５から供給された石炭を平均粒径６０μｍ～８０μｍに粉砕して微粉炭を製造する。微粉炭機１２０としては、ローラミル、チューブミル、ボーラミル、ビータミル、インペラーミル等が用いられる。 The coal bunker 110 stores coal supplied from a coal silo (not shown) by a coal transport facility. The coal feeder 115 supplies the coal supplied from the coal bunker 110 to the coal pulverizer 120 at a predetermined supply speed.
The coal pulverizer 120 pulverizes the coal supplied from the coal feeder 115 to an average particle size of 60 μm to 80 μm to produce pulverized coal. As the coal pulverizer 120, a roller mill, a tube mill, a bora mill, a beater mill, an impeller mill, or the like is used.

燃焼ボイラ１４０は、微粉炭供給管微粉炭機１３０から供給された微粉炭を、強制的に供給された空気と共に微粉炭バーナｂにより燃焼する。微粉炭を燃焼することによりクリンカアッシュ及びフライアッシュなどの石炭灰が生成されると共に、排ガスが発生する。クリンカアッシュとは、石炭灰のうち、燃焼ボイラ１４０の底部に落下する塊状の石炭灰をいう。フライアッシュとは、石炭灰のうち、排ガスと共に排気通路１５０側に流通する、粒径の小さい（粒径２００μｍ程度以下）の石炭灰をいう。
排気通路１５０は、燃焼ボイラ１４０の下流側に配置され、燃焼ボイラ１４０で発生した排ガス及び石炭灰を流通させる。 The combustion boiler 140 burns the pulverized coal supplied from the pulverized coal supply pipe coal pulverizer 130 with forcibly supplied air by the pulverized coal burner b. By burning the pulverized coal, coal ash such as clinker ash and fly ash is generated, and exhaust gas is generated. The clinker ash refers to the coal ash in the form of lumps that fall to the bottom of the combustion boiler 140. The fly ash refers to the coal ash with a small particle size (particle size of about 200 μm or less) that flows into the exhaust passage 150 side together with the exhaust gas.
The exhaust passage 150 is disposed downstream of the combustion boiler 140 and allows the exhaust gas and coal ash generated in the combustion boiler 140 to flow therethrough.

脱硝装置１６０は、排ガス中の窒素酸化物を除去する。脱硝装置１６０は、例えば、乾式アンモニア接触還元法により排ガス中の窒素酸化物を除去する。乾式アンモニア接触還元法は、比較的高温（３００℃～４００℃）の排ガス中に還元剤としてアンモニアガスを注入し、脱硝触媒との作用により排ガス中の窒素酸化物を窒素と水蒸気に分解する方法である。The denitration device 160 removes nitrogen oxides from the exhaust gas. The denitration device 160 removes nitrogen oxides from the exhaust gas, for example, by dry ammonia catalytic reduction. The dry ammonia catalytic reduction method involves injecting ammonia gas as a reducing agent into exhaust gas at a relatively high temperature (300°C to 400°C), and decomposing the nitrogen oxides in the exhaust gas into nitrogen and water vapor through the action of a denitration catalyst.

脱硝装置１６０は、図２に示すように、脱硝反応が行われる脱硝反応器１６１と、脱硝反応器１６１の内部に配置される複数段の脱硝触媒層１６２とを備える。脱硝触媒層１６２は、複数のケーシング１６３により構成される。ケーシング１６３には、複数の脱硝触媒Ｃが収容される。
脱硝触媒Ｃは、長手方向に延びる複数の貫通孔Ｃ１が形成されたハニカム構造を有する、長尺状（直方体状）の触媒である。複数の脱硝触媒Ｃは、貫通孔Ｃ１の延びる方向が排ガスの流路に沿うように配置される。 2, the denitration device 160 includes a denitration reactor 161 in which a denitration reaction takes place, and a plurality of stages of denitration catalyst layers 162 disposed inside the denitration reactor 161. The denitration catalyst layers 162 are composed of a plurality of casings 163. A plurality of denitration catalysts C are housed in the casings 163.
The denitration catalyst C is an elongated (rectangular) catalyst having a honeycomb structure with a plurality of through holes C1 extending in the longitudinal direction. The plurality of denitration catalysts C are arranged such that the extension direction of the through holes C1 is along the flow path of the exhaust gas.

空気予熱器１７０は、排気通路１５０における脱硝装置１６０の下流側に配置される。空気予熱器１７０は、脱硝装置１６０を通過した排ガスと燃焼用空気とを熱交換させ、排ガスを冷却すると共に、燃焼用空気を加熱する。加熱された燃焼用空気は、押込通風機１７５によりボイラ１４０に供給される。The air preheater 170 is disposed downstream 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, cooling the exhaust gas and heating the combustion air. The heated combustion air is supplied to the boiler 140 by the forced draft fan 175.

熱回収用ガスヒータ１８０は、排気通路１５０における空気予熱器１７０の下流側に配置される。熱回収用ガスヒータ１８０には、空気予熱器１７０において熱回収された排ガスが供給される。熱回収用ガスヒータ１８０は、排ガスから更に熱回収を行う。The heat recovery gas heater 180 is disposed downstream of the air preheater 170 in the exhaust passage 150. The heat recovery gas heater 180 is supplied with exhaust gas whose heat has been recovered in the air preheater 170. The heat recovery gas heater 180 further recovers heat from the exhaust gas.

電気集塵装置１９０は、排気通路１５０における熱回収用ガスヒータ１８０の下流側に配置される。電気集塵装置１９０には、熱回収用ガスヒータ１８０において熱回収された排ガスが供給される。電気集塵装置１９０は、電極に電圧を印加することによって排ガス中の石炭灰（フライアッシュ）を収集（捕捉）する装置である。電気集塵装置１９０において収集（捕捉）されるフライアッシュは、フライアッシュ回収装置１９１に回収される。The electrostatic precipitator 190 is disposed downstream of the heat recovery gas heater 180 in the exhaust passage 150. The electrostatic precipitator 190 is supplied with exhaust gas whose heat has been recovered in the heat recovery gas heater 180. The electrostatic precipitator 190 is a device that collects (captures) coal ash (fly ash) in the exhaust gas by applying a voltage to the electrodes. The fly ash collected (captured) in the electrostatic precipitator 190 is collected in the fly ash recovery device 191.

誘引通風機２１０は、排気通路１５０における電気集塵装置１９０の下流側に配置される。誘引通風機２１０は、電気集塵装置１９０においてフライアッシュが除去された排ガスを、一次側から取り込んで二次側に送り出す。The induced draft fan 210 is disposed downstream of the electrostatic precipitator 190 in the exhaust passage 150. The induced draft fan 210 takes in the exhaust gas from which the fly ash has been removed by the electrostatic precipitator 190 from the primary side and sends it out to the secondary side.

脱硫装置２２０は、排気通路１５０における誘引通風機２１０の下流側に配置される。脱硫装置２２０には、誘引通風機２１０から送り出された排ガスが供給される。脱硫装置２２０は、例えば湿式石灰－石膏法により排ガス中の硫黄酸化物を除去する。湿式石灰－石膏法は、排ガスに石灰石と水との混合液を吹き付けることにより、排ガスに含有されている硫黄酸化物を混合液に吸収させて脱硫石膏スラリーを生成させ、排ガス中の硫黄酸化物を除去する方法である。この際に発生したホウ素やセレン等の微量物質が含まれる排水は、排水処理装置２２１によって処理される。The desulfurization device 220 is disposed downstream of the induced draft fan 210 in the exhaust passage 150. The desulfurization device 220 is supplied with the exhaust gas sent out from the induced draft fan 210. The desulfurization device 220 removes sulfur oxides from the exhaust gas, for example, by a wet lime-gypsum method. The wet lime-gypsum method is a method in which a mixture of limestone and water is sprayed onto the exhaust gas, causing the sulfur oxides contained in the exhaust gas to be absorbed by the mixture to generate a desulfurized gypsum slurry, thereby removing the sulfur oxides from the exhaust gas. The wastewater generated during this process, which contains trace substances such as boron and selenium, is treated by the wastewater treatment device 221.

再加熱用ガスヒータ２３０は、排気通路１５０における脱硫装置２２０の下流側に配置される。再加熱用ガスヒータ２３０には、脱硫装置２２０において硫黄酸化物が除去された排ガスが供給される。再加熱用ガスヒータ２３０は、排ガスを加熱する。熱回収用ガスヒータ１８０及び再加熱用ガスヒータ２３０は、排気通路１５０における、空気予熱器１７０と電気集塵装置１９０との間を流通する排ガスと、脱硫装置２２０と脱硫通風機２４０との間を流通する排ガスと、の間で熱交換を行うガス－ガスヒータとして構成してもよい。The reheating gas heater 230 is disposed downstream of the desulfurization device 220 in the exhaust passage 150. The reheating gas heater 230 is supplied with exhaust gas from which sulfur oxides have been removed in the desulfurization device 220. The reheating gas heater 230 heats the exhaust gas. The heat recovery gas heater 180 and the reheating gas heater 230 may be configured as a gas-gas heater that performs heat exchange between the exhaust gas flowing between the air preheater 170 and the electrostatic precipitator 190 in the exhaust passage 150 and the exhaust gas flowing between the desulfurization device 220 and the desulfurization fan 240.

脱硫通風機２４０は、排気通路１５０における再加熱用ガスヒータ２３０の下流側に配置される。脱硫通風機２４０は、再加熱用ガスヒータ２３０において加熱された排ガスを一次側から取り込んで二次側に送り出す。The desulfurization fan 240 is disposed downstream of the reheat gas heater 230 in the exhaust passage 150. The desulfurization fan 240 takes in the exhaust gas heated in the reheat gas heater 230 from the primary side and sends it out to the secondary side.

煙突２５０は、排気通路１５０における脱硫通風機２４０の下流側に配置される。煙突２５０には、再加熱用ガスヒータ２３０で加熱された排ガスが導入される。煙突２５０は、排ガスを排出する。The chimney 250 is disposed downstream of the desulfurization fan 240 in the exhaust passage 150. Exhaust gas heated by the reheat gas heater 230 is introduced into the chimney 250. The chimney 250 discharges the exhaust gas.

［脱硝触媒研磨装置］
上記説明した石炭火力発電設備１００に用いられる脱硝触媒Ｃは、使用の継続に伴いシンタリング等の熱的劣化、触媒成分の被毒による化学的劣化、及び煤塵が触媒表面を被覆する物理的劣化等により、脱硝性能が低下する。脱硝性能が低下した脱硝触媒Ｃは、触媒表面である貫通孔Ｃ１の内面を研磨し、表面の付着物等を除去することで脱硝性能が回復する。
以下、脱硝性能の低下した脱硝触媒Ｃの貫通孔Ｃ１の内面を研磨し、脱硝性能を回復させる脱硝触媒研磨装置１について説明する。 [Denitrification catalyst polishing equipment]
The denitration catalyst C used in the above-described coal-fired power plant 100 loses its denitration performance due to thermal deterioration such as sintering with continued use, chemical deterioration due to poisoning of the catalyst components, and physical deterioration due to coating of the catalyst surface with soot, etc. The denitration performance of the denitration catalyst C with reduced denitration performance can be restored by polishing the inner surface of the through hole C1, which is the catalyst surface, and removing the deposits on the surface, etc.
Hereinafter, a description will be given of a denitration catalyst polishing device 1 that polishes the inner surface of the through hole C1 of a denitration catalyst C whose denitration performance has deteriorated, thereby recovering the denitration performance.

本実施形態に係る脱硝触媒研磨装置１は、脱硝触媒Ｃの貫通孔Ｃ１に空気と共に研磨材Ａを流通させて、貫通孔Ｃ１の内面を研磨する装置である。脱硝触媒研磨装置１は、図３に示すように、混合部１０と、流入路２０と、流出路３０と、サイクロン４０と、コンプレッサ５０と、バグフィルタ６０と、吸引ファン７０と、を備える。脱硝触媒研磨装置１の被研磨対象である脱硝触媒Ｃは、流入路２０における上流側固定部材２２と、流出路３０における下流側固定部材３２との間に挟持される。脱硝触媒Ｃは、脱硝触媒Ｃの貫通孔Ｃ１の流路方向が水平面に対して略垂直になるように固定される。The denitration catalyst polishing device 1 according to this embodiment is a device that polishes the inner surface of the through hole C1 of the denitration catalyst C by circulating the abrasive A together with air through the through hole C1. As shown in FIG. 3, the denitration catalyst polishing device 1 includes a mixing section 10, an inlet passage 20, an outlet passage 30, a cyclone 40, a compressor 50, a bag filter 60, and a suction fan 70. The denitration catalyst C, which is the object to be polished by the denitration catalyst polishing device 1, is sandwiched between an upstream fixing member 22 in the inlet passage 20 and a downstream fixing member 32 in the outlet passage 30. The denitration catalyst C is fixed so that the flow direction of the through hole C1 of the denitration catalyst C is approximately perpendicular to the horizontal plane.

混合部１０は、空気と研磨材Ａとを混合し、流入路２０を介して脱硝触媒Ｃに空気と混合された研磨材Ａを供給する。混合部１０には、ブラストガン１１と、漏斗部１２と、これらを収容するキャビネット１３とが設けられる。ブラストガン１１は、エアホース５１を介してコンプレッサ５０と連結されており、圧縮空気を噴射可能である。ブラストガン１１は、複数台設けられていてもよい。ブラストガン１１には、後述する研磨材供給路３３が連結される。ブラストガン１１から圧縮空気が噴射されると、エジェクター効果が生じ、研磨材供給路３３を通じて研磨材Ａがブラストガン１１内に供給される。そして、ブラストガン１１の内部で研磨材Ａと圧縮空気とが混合され、漏斗部１２に噴射される。噴射された研磨材Ａは、空気と均一に混合された状態で、漏斗部１２を通じて流入路２０に流入する。The mixing section 10 mixes air and abrasive A, and supplies the abrasive A mixed with air to the denitrification catalyst C through the inflow passage 20. The mixing section 10 is provided with a blast gun 11, a funnel section 12, and a cabinet 13 that houses them. The blast gun 11 is connected to a compressor 50 through an air hose 51, and can inject compressed air. A plurality of blast guns 11 may be provided. The blast gun 11 is connected to an abrasive supply passage 33, which will be described later. When compressed air is injected from the blast gun 11, an ejector effect occurs, and the abrasive A is supplied into the blast gun 11 through the abrasive supply passage 33. Then, the abrasive A and the compressed air are mixed inside the blast gun 11 and injected into the funnel section 12. The injected abrasive A flows into the inflow passage 20 through the funnel section 12 in a state where it is uniformly mixed with air.

流入路２０は、脱硝触媒Ｃの上流側の流路であり、空気と混合された研磨材Ａが脱硝触媒Ｃの下方から流入する流路である。流入路２０は、上流側流路２１及び上流側固定部材２２からなる。上流側流路２１は、屈曲部を有する流路であり、上流側が漏斗部１２と連結され、下流側が上流側固定部材２２と連結される。上流側固定部材２２は、直線状の流路を有し、下流側が脱硝触媒Ｃの下端部（上流側端部）と連結されて脱硝触媒Ｃを固定する。空気と混合された研磨材Ａは、上流側固定部材２２を通じて脱硝触媒Ｃの貫通孔Ｃ１に流入する。脱硝触媒Ｃの貫通孔Ｃ１に流入する研磨材Ａの構成については、後段で詳述する。The inlet passage 20 is a flow path on the upstream side of the denitration catalyst C, and is a flow path through which the abrasive A mixed with air flows in from below the denitration catalyst C. The inlet passage 20 consists of an upstream flow path 21 and an upstream fixing member 22. The upstream flow path 21 is a flow path with a bent portion, and the upstream side is connected to the funnel portion 12, and the downstream side is connected to the upstream fixing member 22. The upstream fixing member 22 has a straight flow path, and the downstream side is connected to the lower end (upstream end) of the denitration catalyst C to fix the denitration catalyst C. The abrasive A mixed with air flows into the through hole C1 of the denitration catalyst C through the upstream fixing member 22. The configuration of the abrasive A flowing into the through hole C1 of the denitration catalyst C will be described in detail later.

流出路３０は、脱硝触媒Ｃの下流側の流路である。流出路３０は、研磨材Ａと、脱硝触媒Ｃの表面が研磨されることで生じた被研磨物とが流通する流路である。研磨材Ａと被研磨物とは、吸引部としての吸引ファン７０により空気と共に吸引される。流出路３０の途中にはサイクロン４０が設けられ、研磨材Ａと被研磨物とが分離される。
流出路３０は、脱硝触媒Ｃの上端部（下流側端部）と連結されて脱硝触媒Ｃを固定する下流側固定部材３２と、下流側固定部材３２とサイクロン４０とを連結する下流側流路３１と、サイクロン４０と混合部１０とを連結する研磨材供給路３３と、を有する。 The outflow path 30 is a flow path downstream of the denitration catalyst C. The outflow path 30 is a flow path through which the abrasive A and the object to be polished generated by polishing the surface of the denitration catalyst C flow. The abrasive A and the object to be polished are sucked together with air by a suction fan 70 serving as a suction section. A cyclone 40 is provided midway through the outflow path 30, and the abrasive A and the object to be polished are separated.
The outflow path 30 has a downstream fixing member 32 that is connected to the upper end (downstream end) of the denitration catalyst C to fix the denitration catalyst C, a downstream flow path 31 that connects the downstream fixing member 32 to the cyclone 40, and an abrasive supply path 33 that connects the cyclone 40 to the mixing section 10.

サイクロン４０は、公知のサイクロン分級器であり、混合部１０よりも高い位置に配置される。サイクロン４０の上流端は、下流側流路３１と連結される。サイクロン４０の下部には研磨材供給路３３が連結され、サイクロン４０により分離された研磨材Ａは、研磨材供給路３３を通じて重力により落下して混合部１０に供給される。サイクロン４０の下流端は、搬送パイプ４１と連結され、搬送パイプ４１の下流端は、バグフィルタ６０と連結される。サイクロン４０により分離された被研磨物は、空気と共に搬送パイプ４１を通じてバグフィルタ６０に流入する。The cyclone 40 is a known cyclone classifier and is positioned higher than the mixing section 10. The upstream end of the cyclone 40 is connected to the downstream flow path 31. The abrasive supply path 33 is connected to the bottom of the cyclone 40, and the abrasive A separated by the cyclone 40 falls by gravity through the abrasive supply path 33 and is supplied to the mixing section 10. The downstream end of the cyclone 40 is connected to the conveying pipe 41, and the downstream end of the conveying pipe 41 is connected to the bag filter 60. The polished material separated by the cyclone 40 flows into the bag filter 60 through the conveying pipe 41 together with air.

バグフィルタ６０は、公知の集塵装置である。バグフィルタ６０は、脱硝触媒Ｃの被研磨物を含む空気中の粉塵を捕集する。捕集された粉塵は、バグフィルタ６０の下部に設けられた図示しない貯蔵部に貯蔵され、所望のタイミングで回収される。バグフィルタ６０の下流端は、連結パイプ６１と連結される。連結パイプ６１の下流端は、吸引部としての吸引ファン７０に連結される。バグフィルタ６０を通過して粉塵が除去された清浄な空気は、吸引ファン７０によって吸引されて、排気ダクト７１により大気中に排出される。The bag filter 60 is a known dust collecting device. The bag filter 60 captures dust particles in the air, including the polished material of the denitration catalyst C. The captured dust particles are stored in a storage unit (not shown) provided at the bottom of the bag filter 60, and are collected at the desired timing. The downstream end of the bag filter 60 is connected to a connecting pipe 61. The downstream end of the connecting pipe 61 is connected to a suction fan 70 as a suction unit. The clean air from which dust particles have been removed by passing through the bag filter 60 is sucked in by the suction fan 70 and discharged into the atmosphere by an exhaust duct 71.

次に、本実施形態に係る脱硝触媒研磨装置１の、脱硝触媒Ｃに流入する研磨材Ａの構成について、図面を参照して以下説明する。図４は、上流側固定部材２２に固定された脱硝触媒Ｃ付近の断面を示す概念図である。Next, the configuration of the abrasive A flowing into the denitration catalyst C in the denitration catalyst polishing device 1 according to this embodiment will be described below with reference to the drawings. Figure 4 is a conceptual diagram showing a cross section near the denitration catalyst C fixed to the upstream fixing member 22.

図４に示すように、本実施形態に係る脱硝触媒Ｃは、複数の貫通孔Ｃ１の流路方向が水平面に対して略垂直になるように配置されて固定される。そして、複数の貫通孔Ｃ１に対し、脱硝触媒Ｃの下方に連結される上流側固定部材２２を通じ、空気と混合された研磨材Ａが、下方から上方に向けて流通し、貫通孔Ｃ１の内面が研磨される。As shown in Figure 4, the denitration catalyst C according to this embodiment is arranged and fixed so that the flow direction of the multiple through holes C1 is approximately perpendicular to the horizontal plane. Abrasive A mixed with air flows from the bottom to the top of the multiple through holes C1 through the upstream fixing member 22 connected to the bottom of the denitration catalyst C, polishing the inner surface of the through holes C1.

本実施形態に係る研磨材Ａは、第１の砥粒Ａ１と、第２の砥粒Ａ２（以下、単に「砥粒Ａ１」及び「砥粒Ａ２」と記載する場合がある）と、からなり、砥粒Ａ１と砥粒Ａ２とは、貫通孔Ｃ１を流通する速度が異なる。例えば、砥粒Ａ１と砥粒Ａ２とは、平均粒子径及び密度のうち、少なくとも何れかが異なる。
砥粒Ａ１と、砥粒Ａ２とは、図４に示すように、例えば粒径の大きな砥粒Ａ１と、粒径の小さな砥粒Ａ２と、からなる。砥粒Ａ１と砥粒Ａ２の密度が同じである場合、粒径の大きな砥粒Ａ１は、砥粒Ａ２と比較し、質量が大きい。従って、砥粒Ａ１及び砥粒Ａ２が空気と共に下方から上方に向けて貫通孔Ｃ１を流通する際、砥粒Ａ１に働く重力が砥粒Ａ２よりも大きいため、砥粒Ａ１の流通速度は砥粒Ａ２の流通速度よりも小さくなる。すると、砥粒Ａ１に対し、砥粒Ａ２が衝突し、砥粒Ａ２は貫通孔Ｃ１の中で飛散する。これにより、貫通孔Ｃ１の内面に衝突する砥粒Ａ２の割合が増える結果、脱硝触媒Ｃの研磨効率が向上する。 The abrasive A according to this embodiment is composed of first abrasive grains A1 and second abrasive grains A2 (hereinafter, sometimes simply referred to as "abrasive grains A1" and "abrasive grains A2"). The abrasive grains A1 and A2 have different flow rates through the through holes C1. For example, the abrasive grains A1 and A2 have different average particle diameters and/or densities.
As shown in FIG. 4, the abrasive grains A1 and A2 are, for example, abrasive grains A1 with a large grain size and abrasive grains A2 with a small grain size. When the density of the abrasive grains A1 and A2 is the same, the abrasive grains A1 with a large grain size have a larger mass than the abrasive grains A2. Therefore, when the abrasive grains A1 and A2 flow through the through hole C1 from the bottom to the top together with the air, the gravity acting on the abrasive grains A1 is larger than that on the abrasive grains A2, so that the flow speed of the abrasive grains A1 is smaller than that of the abrasive grains A2. Then, the abrasive grains A2 collide with the abrasive grains A1, and the abrasive grains A2 are scattered in the through hole C1. As a result, the ratio of the abrasive grains A2 that collide with the inner surface of the through hole C1 increases, and the polishing efficiency of the denitration catalyst C is improved.

仮に、研磨材Ａに含まれる砥粒の流通速度が同じである場合、上記のような衝突は起こりにくい。そうすると、研磨材Ａの流速を増加させた場合に、貫通孔Ｃ１の内面に衝突せず、貫通孔Ｃ１をすり抜けてしまう砥粒の割合が増加する。従って、研磨材Ａの流速を増加させても、それに見合う研磨効率の向上が得られない場合がある。本実施形態においては、２種類の流通速度が異なる砥粒Ａ１及び砥粒Ａ２を研磨材Ａとして用いる事で、脱硝触媒Ｃの研磨効率を向上させることができる。If the flow speed of the abrasive grains contained in the abrasive A is the same, the above collision is unlikely to occur. In that case, when the flow speed of the abrasive A is increased, the proportion of abrasive grains that do not collide with the inner surface of the through hole C1 and slip through the through hole C1 increases. Therefore, even if the flow speed of the abrasive A is increased, there are cases where an increase in the flow speed of the abrasive A does not result in a commensurate improvement in the polishing efficiency. In this embodiment, by using two types of abrasive grains A1 and A2, which have different flow speeds, as the abrasive A, the polishing efficiency of the denitrification catalyst C can be improved.

砥粒Ａ１は、上記研磨効率を向上させるため、ＪＩＳ Ｒ６００１に規定される粒度がＦ７～Ｆ１４であることが好ましく、粒度Ｆ８～Ｆ１２であることがより好ましく、粒度Ｆ１０であることが更に好ましい。同様に、砥粒Ａ２の平均粒子径は、ＪＩＳ Ｒ６００１に規定される粒度がＦ３６～Ｆ６０であることが好ましく、粒度Ｆ４０～Ｆ５４であることがより好ましく、Ｆ４６であることが更に好ましい。砥粒Ａ１の累積高さ５０％点の粒子径である平均粒子径は、１．６５～２．１６ｍｍであることが好ましい。砥粒Ａ２の累積高さ５０％点の粒子径である平均粒子径は、０．３０～０．４５ｍｍであることが好ましい。In order to improve the polishing efficiency, the grain size of the abrasive grain A1 is preferably F7 to F14 as specified in JIS R6001, more preferably F8 to F12, and even more preferably F10. Similarly, the average grain size of the abrasive grain A2 is preferably F36 to F60 as specified in JIS R6001, more preferably F40 to F54, and even more preferably F46. The average grain size of the abrasive grain A1 at the 50% point of the cumulative height is preferably 1.65 to 2.16 mm. The average grain size of the abrasive grain A2 at the 50% point of the cumulative height is preferably 0.30 to 0.45 mm.

砥粒Ａ１の研磨材Ａにおける割合は、５～１５重量％であることが好ましい。砥粒Ａ１の割合が上記範囲に対して少なすぎると、研磨効率を十分向上させることができない。また、砥粒Ａ１の割合が上記範囲に対して多すぎると、脱硝触媒Ｃを均一に研磨できず、研磨が不十分な箇所と、研磨過剰な箇所が生じてしまう。また、脱硝触媒Ｃが破損する恐れがある。The proportion of abrasive grains A1 in abrasive material A is preferably 5 to 15% by weight. If the proportion of abrasive grains A1 is too low relative to the above range, the polishing efficiency cannot be sufficiently improved. Furthermore, if the proportion of abrasive grains A1 is too high relative to the above range, the denitration catalyst C cannot be polished uniformly, resulting in some areas that are insufficiently polished and others that are over-polished. There is also a risk of the denitration catalyst C being damaged.

砥粒Ａ１及び砥粒Ａ２の材質としては、特に制限されないが、例えば、ダイヤモンド、ＣＢＮ（立方晶窒化ホウ素）、Ｂ４Ｃ（炭化ホウ素）、炭化ケイ素、シリカ、セリア、アルミナ、ホワイトアルミナ、ジルコニア、チタニア、マンガン酸化物、炭酸バリウム、酸化クロム、及び酸化鉄等が挙げられる。砥粒Ａ１及び砥粒Ａ２の材質を同一とする場合、砥粒Ａ１及び砥粒Ａ２の平均粒子径を異なるものとすることで、砥粒Ａ１及び砥粒Ａ２の貫通孔Ｃ１を流通する速度を異なるものにできる。
また、砥粒Ａ１及び砥粒Ａ２の材質を異なるものとしてもよい。この場合、平均粒子径以外に、砥粒Ａ１と砥粒Ａ２との密度差により、砥粒Ａ１及び砥粒Ａ２の貫通孔Ｃ１を流通する速度を異なるものにできる。更に、流通速度の小さい砥粒を砥粒Ａ１とした場合に、砥粒Ａ１の硬度を、流通速度が大きい砥粒Ａ２の硬度よりも高いものとすることが好ましい。砥粒Ａ１及び砥粒Ａ２は、使用の継続に伴い、割れや欠けが生じ、また、角が取れることで研磨効率が低下するので、一定時間ごとに補充の必要がある。上記構成により、砥粒Ａ１が摩耗しにくくなり、砥粒Ａ１の補充頻度を低減することができる。例えば、砥粒Ａ２としてアルミナやホワイトアルミナを用いる場合、砥粒Ａ１として、より硬度の高いダイヤモンドやＣＢＮを用いることが好ましい。 The material of the abrasive grains A1 and A2 is not particularly limited, and examples thereof include diamond, CBN (cubic boron nitride), B4C (boron carbide), silicon carbide, silica, ceria, alumina, white alumina, zirconia, titania, manganese oxide, barium carbonate, chromium oxide, and iron oxide, etc. When the material of the abrasive grains A1 and A2 is the same, the average particle diameters of the abrasive grains A1 and A2 can be made different from each other to make the speeds at which the abrasive grains A1 and A2 flow through the through holes C1 different.
The abrasive grains A1 and A2 may be made of different materials. In this case, in addition to the average particle size, the density difference between the abrasive grains A1 and A2 can make the flow speeds of the abrasive grains A1 and A2 through the through holes C1 different. Furthermore, when the abrasive grains A1 have a low flow speed, it is preferable that the hardness of the abrasive grains A1 is higher than the hardness of the abrasive grains A2 have a high flow speed. The abrasive grains A1 and A2 are cracked or chipped with continued use, and the polishing efficiency is reduced by the corners being rounded off, so they need to be replenished at regular intervals. With the above configuration, the abrasive grains A1 are less likely to wear out, and the frequency of replenishment of the abrasive grains A1 can be reduced. For example, when alumina or white alumina is used as the abrasive grains A2, it is preferable to use diamond or CBN, which has a higher hardness, as the abrasive grains A1.

（研磨再生方法）
次に、脱硝触媒研磨装置１を用いて脱硝触媒Ｃを研磨再生する方法について説明する。
脱硝触媒研磨装置１の被研磨対象である、脱硝性能が低下した脱硝触媒Ｃを、石炭火力発電設備１００の脱硝装置１６０から取り外す。この際、脱硝触媒Ｃの貫通孔Ｃ１は、石炭灰等で閉塞されている場合があるため、適宜エアブローや水洗等により閉塞物を取り除く。次に、上流側固定部材２２と、下流側固定部材３２との間に脱硝触媒Ｃを挟持し、脱硝触媒Ｃを固定する。この際、例えば脱硝触媒Ｃの、脱硝装置１６０における排ガスの入口側端部であった付着物の多い側を、研磨材Ａの流速の高い下流側となるように配置して固定してもよい。 (Polishing and Regeneration Method)
Next, a method for polishing and regenerating the denitration catalyst C using the denitration catalyst polishing apparatus 1 will be described.
The denitration catalyst C with reduced denitration performance, which is the object to be polished by the denitration catalyst polishing device 1, is removed from the denitration device 160 of the coal-fired power plant 100. At this time, since the through-holes C1 of the denitration catalyst C may be blocked by coal ash or the like, the blocked material is removed by air blowing, water washing, or the like as appropriate. Next, the denitration catalyst C is sandwiched between the upstream fixing member 22 and the downstream fixing member 32 to fix the denitration catalyst C. At this time, for example, the side of the denitration catalyst C with more deposits, which was the inlet end of the exhaust gas inlet of the denitration device 160, may be arranged and fixed so that it is located downstream, where the flow rate of the abrasive A is high.

脱硝触媒研磨装置１の作動を開始すると、吸引ファン７０及びコンプレッサ５０が作動を開始し、混合部１０で空気と混合された研磨材Ａが上流側に吸引される。研磨材Ａは、上流側流路２１及び上流側固定部材２２を介して脱硝触媒Ｃの貫通孔Ｃ１に流入する。研磨材Ａは、砥粒Ａ１及び砥粒Ａ２からなり、例えば砥粒Ａ１は砥粒Ａ２よりも平均粒子径が大きく、貫通孔Ｃ１における流通速度が砥粒Ａ２よりも小さい。従って、砥粒Ａ２は砥粒Ａ１と衝突して飛散することで、貫通孔Ｃ１の内面に衝突しやすい。このような砥粒Ａ１及び砥粒Ａ２により、効率よく貫通孔Ｃ１の内面が研磨される。When the denitration catalyst polishing device 1 starts operating, the suction fan 70 and compressor 50 start operating, and the abrasive A mixed with air in the mixing section 10 is sucked upstream. The abrasive A flows into the through hole C1 of the denitration catalyst C via the upstream flow path 21 and the upstream fixing member 22. The abrasive A is composed of abrasive grains A1 and A2. For example, the abrasive grains A1 have a larger average particle diameter than the abrasive grains A2, and have a smaller flow rate in the through hole C1 than the abrasive grains A2. Therefore, the abrasive grains A2 collide with the abrasive grains A1 and scatter, and are likely to collide with the inner surface of the through hole C1. The inner surface of the through hole C1 is efficiently polished by such abrasive grains A1 and A2.

研磨材Ａは、貫通孔Ｃ１の内面の研磨を行った後、下流側固定部材３２から流出する。流出した研磨材Ａと被研磨物とは、空気と共に吸引ファン７０により吸引されて、下流側流路３１を介してサイクロン４０に流入する。サイクロン４０では、研磨材Ａと被研磨物とが分離され、研磨材Ａは研磨材供給路３３を介して混合部１０に供給される。即ち、研磨材Ａは脱硝触媒研磨装置１内を循環する。サイクロン４０で分離された被研磨物は吸引ファン７０により吸引されて、搬送パイプ４１を介してバグフィルタ６０に流入して捕集される。被研磨物が捕集された後の空気は排気ダクト７１を通じて外部に排出される。所定時間、脱硝触媒研磨装置１の作動を継続させ、脱硝触媒Ｃの貫通孔Ｃ１の内面を研磨し、貫通孔Ｃ１の内面に付着した付着物等を取り除くことで脱硝触媒Ｃを再生する。After polishing the inner surface of the through hole C1, the abrasive A flows out from the downstream fixed member 32. The flowed out abrasive A and the object to be polished are sucked in by the suction fan 70 together with the air and flow into the cyclone 40 through the downstream flow path 31. In the cyclone 40, the abrasive A and the object to be polished are separated, and the abrasive A is supplied to the mixing section 10 through the abrasive supply path 33. That is, the abrasive A circulates inside the denitration catalyst polishing device 1. The object to be polished separated in the cyclone 40 is sucked in by the suction fan 70 and flows into the bag filter 60 through the conveying pipe 41 and is collected. The air after the object to be polished is discharged to the outside through the exhaust duct 71. The operation of the denitration catalyst polishing device 1 is continued for a predetermined time, the inner surface of the through hole C1 of the denitration catalyst C is polished, and the adhering matter attached to the inner surface of the through hole C1 is removed to regenerate the denitration catalyst C.

本実施形態に係る脱硝触媒Ｃの研磨再生方法は、研磨材Ａの補充工程を含む。所定時間、脱硝触媒Ｃの研磨を行うと、研磨材に割れや欠けが生じ、また、研磨材の角が取れることで研磨効率が低下する。また、粒子径が一定以上小さくなった砥粒は、被研磨物と共にサイクロン４０で分離されてバグフィルタ６０側に流入する。つまり、装置内を循環する研磨材Ａの量は研磨時間と共に減少する。従って、研磨効率を維持するため、研磨材Ａの補充工程により、研磨材Ａの補充を行う。上記補充工程は、例えば脱硝触媒研磨装置１を停止させ、脱硝触媒Ｃを取り換えるタイミングで行うことができる。あるいは、脱硝触媒Ｃの研磨中に、脱硝触媒研磨装置１の混合部１０に研磨材Ａを投入して補充してもよい。The polishing and regenerating method for the denitration catalyst C according to this embodiment includes a refilling process for the abrasive A. When the denitration catalyst C is polished for a certain period of time, the abrasive cracks and chips, and the polishing efficiency decreases due to the corners of the abrasive being rounded off. In addition, the abrasive grains whose particle diameter has become smaller than a certain value are separated by the cyclone 40 together with the object to be polished and flow into the bag filter 60. In other words, the amount of the abrasive A circulating in the device decreases with the polishing time. Therefore, in order to maintain the polishing efficiency, the abrasive A is replenished by the refilling process for the abrasive A. The refilling process can be performed, for example, when the denitration catalyst polishing device 1 is stopped and the denitration catalyst C is replaced. Alternatively, the abrasive A may be added to the mixing section 10 of the denitration catalyst polishing device 1 during the polishing of the denitration catalyst C to refill it.

研磨材Ａの補充工程では、例えば平均粒子径の大きな砥粒Ａ１の、研磨材Ａにおける割合を５～２０重量％とし、残りを平均粒子径の小さな砥粒Ａ２とした研磨材Ａを補充する。上記砥粒Ａ１の割合は、研磨開始前の研磨材Ａにおける砥粒Ａ１の割合よりも高い。これは、砥粒Ａ１は、砥粒Ａ２と衝突して割れが生じる等の理由により、流通速度の小さい砥粒Ａ１として機能しなくなる割合が砥粒Ａ２よりも高いためである。In the process of replenishing abrasive A, for example, 5-20% by weight of abrasive grains A1 with a large average particle size is replenished with abrasive grains A2 with a small average particle size. The proportion of abrasive grains A1 is higher than the proportion of abrasive grains A1 in abrasive A before polishing begins. This is because abrasive grains A1 collide with abrasive grains A2 and fail to function as abrasive grains A1 with a low flow rate at a higher rate than abrasive grains A2, due to reasons such as cracking.

本発明は、上記実施形態に制限されるものではなく、適宜変更が可能である。The present invention is not limited to the above embodiments and can be modified as appropriate.

上記実施形態に係る砥粒Ａ１及び砥粒Ａ２を、平均粒子径が異なるものとして説明したが、上記に限定されない。砥粒Ａ１及び砥粒Ａ２は、貫通孔Ｃ１を流通する速度が異なるものであればよい。例えば、砥粒Ａ１の密度が砥粒Ａ２の密度よりも大きく、大きさが同じである場合、砥粒Ａ１の質量は砥粒Ａ２の質量と比較して大きくなる。これにより、同様に２種類の砥粒の流通速度に差が生じて砥粒Ａ１に砥粒Ａ２が衝突して飛散する同様の現象が起こり、研磨効率を向上させることができる。例えば砥粒Ａ１と砥粒Ａ２の材質を異なるものとすることで、砥粒Ａ１と砥粒Ａ２の平均密度を異なるものとすることができる。砥粒Ａ１と砥粒Ａ２とは、平均粒子径と平均密度のいずれもが異なることで、流通速度に差があるものであってもよい。Although the abrasive grains A1 and A2 in the above embodiment have been described as having different average particle diameters, the present invention is not limited to the above. The abrasive grains A1 and A2 may have different flow speeds through the through hole C1. For example, if the density of the abrasive grains A1 is greater than that of the abrasive grains A2 and the grains are the same size, the mass of the abrasive grains A1 will be greater than the mass of the abrasive grains A2. This will cause a difference in the flow speed of the two types of abrasive grains, resulting in a similar phenomenon in which the abrasive grains A2 collide with the abrasive grains A1 and scatter, thereby improving the polishing efficiency. For example, by making the materials of the abrasive grains A1 and A2 different, the average densities of the abrasive grains A1 and A2 can be made different. The abrasive grains A1 and A2 may have different flow speeds due to differences in both average particle diameter and average density.

上記実施形態では、研磨材Ａを砥粒Ａ１及び砥粒Ａ２からなるものとして説明したが、上記に限定されない。研磨材Ａは、砥粒Ａ１及び砥粒Ａ２以外に、他の砥粒を含んでいてもよい。In the above embodiment, the abrasive A is described as being composed of abrasive grains A1 and A2, but is not limited to the above. The abrasive A may contain other abrasive grains in addition to the abrasive grains A1 and A2.

１ 脱硝触媒研磨装置
１０ 混合部
２０ 流入路
２２ 上流側固定部材
７０ 吸引ファン（吸引部）
Ｃ 脱硝触媒
Ｃ１ 貫通孔
Ａ 研磨材
Ａ１ 第１の砥粒
Ａ２ 第２の砥粒 1 Denitration catalyst polishing device 10 Mixing section 20 Inflow passage 22 Upstream side fixing member 70 Suction fan (suction section)
C Denitration catalyst C1 Through hole A Abrasive A1 First abrasive grain A2 Second abrasive grain

Claims (9)

長手方向に延びる複数の貫通孔が設けられた脱硝触媒の前記貫通孔に、空気と共に研磨材を流通させて、前記貫通孔の内面を研磨する脱硝触媒研磨方法であって、
前記脱硝触媒は、前記貫通孔の流路方向が水平面に対して略垂直になるように配置され、
前記研磨材は、前記貫通孔の下方から上方に向けて流通し、
前記研磨材は、第１の砥粒と、第２の砥粒と、を含み、
前記第１の砥粒と、前記第２の砥粒とは、前記貫通孔を流通する速度が異なる、脱硝触媒研磨方法。 A method for polishing a denitration catalyst, the method comprising: passing an abrasive through a plurality of through holes extending in a longitudinal direction of the denitration catalyst together with air to polish an inner surface of the through holes, the method comprising the steps of:
The denitration catalyst is disposed such that a flow path direction of the through hole is substantially perpendicular to a horizontal plane,
The abrasive flows from the bottom to the top of the through hole,
The abrasive material includes a first abrasive grain and a second abrasive grain,
A method for polishing a Denitration catalyst, wherein the first abrasive grains and the second abrasive grains flow through the through holes at different speeds. 前記第１の砥粒の平均粒子径Ｄ１は、前記第２の砥粒の平均粒子径Ｄ２よりも大きい、請求項１に記載の脱硝触媒研磨方法。 A denitration catalyst polishing method as described in claim 1, wherein the average particle diameter D1 of the first abrasive grains is larger than the average particle diameter D2 of the second abrasive grains. 前記平均粒子径Ｄ１は、１．６５～２．１６ｍｍであり、前記平均粒子径Ｄ２は０．３０～０．４５ｍｍである、請求項２に記載の脱硝触媒研磨方法。 A method for polishing a denitration catalyst as described in claim 2, wherein the average particle diameter D1 is 1.65 to 2.16 mm and the average particle diameter D2 is 0.30 to 0.45 mm. 前記第１の砥粒は、前記研磨材中に５～１５重量％含まれる、請求項１～３いずれかに記載の脱硝触媒研磨方法。 A method for polishing a denitration catalyst as described in any one of claims 1 to 3, wherein the first abrasive grains are contained in the abrasive material in an amount of 5 to 15 weight %. 前記研磨材の補充工程を有し、
前記研磨材の補充工程で補充される前記第１の砥粒は、補充される前記研磨材中に５～２０重量％含まれる、請求項１～４いずれかに記載の脱硝触媒研磨方法。 A step of replenishing the abrasive material,
5. The method for polishing a denitration catalyst according to claim 1, wherein the first abrasive grains replenished in the step of replenishing the abrasive are contained in the replenished abrasive in an amount of 5 to 20% by weight. 長手方向に延びる複数の貫通孔が設けられた脱硝触媒の前記貫通孔に、空気と共に研磨材を流通させて、前記貫通孔の内面を研磨する脱硝触媒研磨装置であって、
前記脱硝触媒の上流側に配置され、研磨材と空気とを混合する混合部と、
前記混合部と、前記脱硝触媒とを接続し、前記脱硝触媒の下方から空気と混合された前記研磨材が流入する流入路と、
前記脱硝触媒を、前記貫通孔の流路方向が水平面に対して略垂直になるように固定する固定部材と、
前記脱硝触媒の下流側に配置され、前記脱硝触媒の上方から空気と共に研磨材を吸引する吸引部と、を有し、
前記研磨材は、第１の砥粒と、第２の砥粒と、を含み、
前記第１の砥粒と、前記第２の砥粒とは、前記貫通孔を流通する速度が異なる、脱硝触媒研磨装置。 A denitration catalyst polishing apparatus for polishing an inner surface of a denitration catalyst having a plurality of through holes extending in a longitudinal direction, the apparatus comprising:
A mixing section disposed upstream of the denitration catalyst and configured to mix an abrasive with air;
an inflow passage connecting the mixing section and the denitration catalyst, through which the abrasive mixed with air flows in from below the denitration catalyst;
a fixing member that fixes the denitration catalyst so that a flow path direction of the through hole is approximately perpendicular to a horizontal plane;
a suction section that is disposed downstream of the denitration catalyst and that sucks in an abrasive together with air from above the denitration catalyst;
The abrasive material includes a first abrasive grain and a second abrasive grain,
The first abrasive grains and the second abrasive grains flow through the through holes at different speeds. 前記第１の砥粒の平均粒子径Ｄ１は、前記第２の砥粒の平均粒子径Ｄ２よりも大きい、請求項６に記載の脱硝触媒研磨装置。 A denitration catalyst polishing apparatus as described in claim 6, wherein the average particle diameter D1 of the first abrasive grains is larger than the average particle diameter D2 of the second abrasive grains. 前記平均粒子径Ｄ１は、１．６５～２．１６ｍｍであり、前記平均粒子径Ｄ２は０．３０～０．４５ｍｍである、請求項７に記載の脱硝触媒研磨装置。 A denitration catalyst polishing apparatus as described in claim 7, wherein the average particle diameter D1 is 1.65 to 2.16 mm and the average particle diameter D2 is 0.30 to 0.45 mm. 前記第１の砥粒は、前記研磨材中に５～１５重量％重量％含まれる、請求項６～８いずれかに記載の脱硝触媒研磨装置。A denitration catalyst polishing device as described in any one of claims 6 to 8, wherein the first abrasive grains are contained in the abrasive material in an amount of 5 to 15% by weight.
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Citations (2)

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JPS58150439A (en) * 1982-03-04 1983-09-07 Mitsubishi Heavy Ind Ltd Activation of catalyst
JPS6257864A (en) * 1985-09-09 1987-03-13 Ebara Corp Polishing method for bend part
JPH04197451A (en) * 1990-11-29 1992-07-17 Japan Carlit Co Ltd:The Recycling of denitration catalyst

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JP2012000693A (en) 2010-06-14 2012-01-05 Hidaka Fine-Technologies Co Ltd Grinding device and grinding method
US20180141034A1 (en) 2015-05-12 2018-05-24 Geesco Co., Ltd. Method for regenerating catalyst

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