JP4840990B2 - Catalyst regeneration method and catalyst regeneration facility - Google Patents

Catalyst regeneration method and catalyst regeneration facility Download PDF

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JP4840990B2
JP4840990B2 JP2006258979A JP2006258979A JP4840990B2 JP 4840990 B2 JP4840990 B2 JP 4840990B2 JP 2006258979 A JP2006258979 A JP 2006258979A JP 2006258979 A JP2006258979 A JP 2006258979A JP 4840990 B2 JP4840990 B2 JP 4840990B2
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賢 鈴木
昌明 倉田
隆行 工藤
典生 前田
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Takuma KK
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Description

本発明は触媒再生方法と触媒再生設備に関し、詳しくは、焼却設備などから排出され窒素酸化物を含む排ガスを通して脱硝する脱硝触媒装置の触媒再生方法と触媒再生設備に関する。   The present invention relates to a catalyst regeneration method and a catalyst regeneration facility, and more particularly to a catalyst regeneration method and a catalyst regeneration facility of a denitration catalyst device that denitrates through exhaust gas discharged from an incineration facility or the like and containing nitrogen oxides.

各種ゴミなどの廃棄物を焼却する焼却設備から排出される排ガス中には、窒素酸化物等の有害物質が含まれており、排ガス中にアンモニアを吹き込むことにより、脱硝触媒を有する脱硝反応設備で分解除去される。しかし、排ガス中に含まれる硫黄酸化物、塩化水素とアンモニアによって生成される酸性硫安や塩化アンモニウムが脱硝触媒表面に堆積して、触媒性能を劣化させる。   The exhaust gas discharged from the incineration equipment that incinerates various wastes and other waste contains harmful substances such as nitrogen oxides. By injecting ammonia into the exhaust gas, the denitration reaction equipment has a denitration catalyst. Decomposed and removed. However, sulfur oxides contained in the exhaust gas, acidic ammonium sulfate produced by hydrogen chloride and ammonia, and ammonium chloride are deposited on the surface of the denitration catalyst to deteriorate the catalyst performance.

そこで、劣化した触媒を再生して使用する方法が行われている。例えば、(1)反応設備から一旦触媒を取り出し、加熱炉で酸性硫安および塩化アンモニウムを揮発させる方法(例えば、特許文献1)、(2)脱硝反応設備から一旦触媒を取り出し、水で酸性硫安および塩化アンモニウムを洗い流す方法、(3)運転中の他系列の焼却設備より燃焼ガスを脱硝触媒装置に引き込み、脱硝触媒装置内で酸性硫安および塩化アンモニウムを揮発させて、再度他系列の排ガス処理設備に排出する方法であり、特に焼却現場で再生される、等がある。   Therefore, a method of regenerating and using a deteriorated catalyst has been performed. For example, (1) a method in which a catalyst is once taken out from a reaction facility and acid ammonium sulfate and ammonium chloride are volatilized in a heating furnace (for example, Patent Document 1), (2) a catalyst is once taken out from a denitration reaction facility, (3) The combustion gas is drawn into the denitration catalyst unit from the other incineration facilities in operation, and acid ammonium sulfate and ammonium chloride are volatilized in the denitration catalyst unit. It is a method of discharging, and in particular, it is regenerated at the incineration site.

(1),(2)は、触媒設備から触媒を取り出し、再生現場まで触媒を輸送して、再生設備に触媒を取り付けて再生を行うようにしているため、触媒の取り出し、輸送、取り付け時の衝撃などによって触媒が損傷するおそれがあり、特に(2)の方法では、水洗時に被毒物質と共に触媒成分であるV2 5 が溶出するという問題がある。 In (1) and (2), the catalyst is taken out from the catalyst equipment, transported to the regeneration site, and the catalyst is attached to the regeneration equipment for regeneration. The catalyst may be damaged by impact or the like. In particular, the method (2) has a problem in that V 2 O 5 which is a catalyst component is eluted together with the poisonous substance during washing with water.

(3)の方法では、2系列以上の焼却設備がある施設のみで再生可能であり、その内、1系列以上が稼働していないと再生することができない。   The method (3) can be regenerated only in a facility having two or more incineration facilities, and cannot be regenerated unless one or more of them are in operation.

更に、触媒塔の内部を2室以上に分割して、1室ずつ触媒再生を行いながら、残りの室に排ガスを通して処理する方法も提案されている(例えば、特許文献2)。   Furthermore, a method has been proposed in which the interior of the catalyst tower is divided into two or more chambers, and the catalyst is regenerated one by one while exhaust gas is passed through the remaining chambers (for example, Patent Document 2).

特開2001−219078号公報Japanese Patent Laid-Open No. 2001-219078 特開平10−192657号公報Japanese Patent Laid-Open No. 10-192657

しかしながら、上記従来技術の方法は、触媒反応塔の構造が複雑となり、そのための設備コストが必要となるため、少なくない処理コストを要するという問題がある。   However, the above-described prior art method has a problem that the structure of the catalytic reaction tower is complicated and equipment costs are required for that purpose, so that a considerable processing cost is required.

そこで、本発明の目的は、上記従来技術の問題点に鑑みて、複雑で設備コストのかかる構成を要することなく、焼却施設の脱硝触媒装置などに既に設置されている設備を用いて処理コストを低減でき、それでいて触媒を脱硝触媒装置から取り外すことなく、触媒の加熱再生を可能にする触媒再生方法と触媒再生設備を提供することにある。   Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is to reduce the processing cost by using equipment already installed in a denitration catalyst device of an incineration facility without requiring a complicated and expensive equipment configuration. It is an object of the present invention to provide a catalyst regeneration method and a catalyst regeneration facility that can reduce the temperature while allowing the catalyst to be heated and regenerated without removing the catalyst from the denitration catalyst device.

上記課題は、各請求項記載の発明により達成される。すなわち、本発明に係る触媒再生方法の特徴構成は、焼却炉停止時に、焼却設備から発生する窒素酸化物を含む排ガスを通して脱硝する脱硝触媒装置の出口側ダクトと入口側ダクトとを閉鎖し排ガス流路を遮断し、系内のガスを350〜550℃に加熱して前記脱硝触媒装置に送給する循環系において、前記脱硝触媒装置の脱硝触媒に堆積した被毒物質から発生するガス成分を前記循環系に設けたガス処理装置により分解除去したガスを再生ガスとし、この再生ガスを再度前記温度範囲まで加熱し、前記脱硝触媒装置へ送給して脱硝触媒装置中の脱硝触媒を再生することにある。 The above-mentioned subject is achieved by the invention described in each claim. That is, the characteristic configuration of the catalyst regeneration method according to the present invention is such that when the incinerator is stopped, the outlet side duct and the inlet side duct of the denitration catalyst device that denitrates through the exhaust gas containing nitrogen oxides generated from the incineration facility are closed to flow the exhaust gas. In the circulation system in which the passage is shut off and the gas in the system is heated to 350 to 550 ° C. and fed to the denitration catalyst device, the gas components generated from poisonous substances deposited on the denitration catalyst of the denitration catalyst device are The gas decomposed and removed by the gas treatment device provided in the circulation system is used as a regeneration gas, and the regeneration gas is heated again to the temperature range and fed to the denitration catalyst device to regenerate the denitration catalyst in the denitration catalyst device. It is in.

この構成によれば、脱硝触媒装置に内蔵されている触媒表面の結露を防止するために設置している既存のヒータ設備や循環ファン設備などを、再生ガスを循環系内に通流させつつ加熱する工程に利用することができ、脱硝触媒を再生するための特別の装置をそれだけ軽減でき、設備コストを低減できる結果、処理コスト自体を低減できるものとなる。しかも、これらの既存設備を取り入れた循環系を形成するようにしているので、殊更複雑で設備コストのかかる設備を使用することがない。   According to this configuration, the existing heater equipment and circulation fan equipment installed to prevent condensation on the catalyst surface built in the denitration catalyst device are heated while allowing the regeneration gas to flow through the circulation system. As a result, the special equipment for regenerating the denitration catalyst can be reduced by that much, and the equipment cost can be reduced. As a result, the processing cost itself can be reduced. In addition, since the circulation system incorporating these existing facilities is formed, it is not necessary to use facilities that are particularly complicated and costly.

なお、再生ガスの温度が350℃未満であると、脱硝触媒の再生効率が低くなって好ましくなく、550℃を超えると脱硝触媒が熱分解する可能性があり劣化するため好ましくない。   Note that if the temperature of the regeneration gas is less than 350 ° C., the regeneration efficiency of the denitration catalyst is lowered, which is not preferable. If the temperature exceeds 550 ° C., the denitration catalyst may be thermally decomposed and deteriorated.

その結果、複雑で設備コストのかかる構成を要することなく、焼却施設の排ガス処理設備などに既に設置されている設備を用いて処理コストを低減でき、それでいて触媒を脱硝触媒装置から取り外すことなく、触媒の加熱再生を可能にする触媒再生方法を提供することができた。   As a result, the processing cost can be reduced by using the equipment already installed in the exhaust gas treatment equipment of the incineration facility without requiring a complicated and costly configuration, and the catalyst can be reduced without removing the catalyst from the denitration catalyst device. It was possible to provide a catalyst regeneration method that enables heat regeneration of the catalyst.

前記循環系内に設けた圧力計により循環系内の圧力を監視し、圧力が高くなれば、前記循環系内の再生ガスを引き抜き、前記循環系内の圧力を略一定の範囲になるように保持することが好ましい。   The pressure in the circulation system is monitored by a pressure gauge provided in the circulation system, and when the pressure increases, the regeneration gas in the circulation system is withdrawn so that the pressure in the circulation system is in a substantially constant range. It is preferable to hold.

この構成によれば、循環系内の圧力を所定範囲に制御することにより、効果的で安定した操業を可能にする。   According to this configuration, effective and stable operation is enabled by controlling the pressure in the circulation system within a predetermined range.

又、本発明に係る触媒再生設備の特徴構成は、窒素酸化物を含む排ガスを通して脱硝する脱硝触媒装置と、この脱硝触媒装置の出口側ダクトと入口側ダクトとを閉鎖して排ガス流路を遮断する循環系を形成可能な閉鎖手段と、系内のガスを加熱して生成した再生ガスを通流させることにより、この再生ガス中に含まれる、前記脱硝触媒装置の脱硝触媒に堆積した被毒物質から発生するガス成分を分解除去して再度再生ガスを生成するガス処理装置と、前記再生ガスを前記循環系内に通流させる通流手段と、この通流手段により通流される前記再生ガスを加熱する加熱手段と、を前記循環系内に備え、加熱した前記再生ガスを前記脱硝触媒装置へ送給して脱硝触媒装置中の脱硝触媒を再生可能にすることにある。   The characteristic configuration of the catalyst regeneration facility according to the present invention includes a denitration catalyst device that denitrates through exhaust gas containing nitrogen oxides, and shuts off the exhaust gas flow path by closing the outlet side duct and the inlet side duct of the denitration catalyst device. And a poisoning means deposited in the denitration catalyst of the denitration catalyst device contained in the regeneration gas by passing the regeneration gas generated by heating the gas in the system and the closing means capable of forming a circulating system. A gas processing device that decomposes and removes a gas component generated from a substance to generate a regenerated gas; a flow means for flowing the regenerated gas into the circulation system; and the regenerated gas that is flowed by the flow means And a heating means for heating the denitration catalyst in the circulation system and supplying the heated regeneration gas to the denitration catalyst device so that the denitration catalyst in the denitration catalyst device can be regenerated.

この構成によれば、複雑で設備コストのかかる構成を要することなく、焼却施設の排ガス処理設備などに既に設置されている設備を用いて処理コストを低減でき、それでいて触媒を脱硝触媒装置から取り外すことなく、触媒の加熱再生を可能にする触媒再生設備を提供することができる。   According to this configuration, it is possible to reduce the processing cost by using the equipment already installed in the exhaust gas treatment equipment of the incineration facility without requiring a complicated and costly construction, and yet the catalyst is removed from the denitration catalyst device. Thus, it is possible to provide a catalyst regeneration facility that enables heat regeneration of the catalyst.

前記循環系内の圧力を監視する圧力計が設けられていると共に、この圧力計の測定に応じて前記再生ガスを引き抜き、前記循環系内の圧力を略一定の範囲になるように保持可能な再生ガス引抜手段が設けられていることが好ましい。   A pressure gauge for monitoring the pressure in the circulation system is provided, and the regeneration gas can be withdrawn according to the measurement of the pressure gauge, and the pressure in the circulation system can be maintained within a substantially constant range. It is preferable that a regeneration gas extraction means is provided.

この構成によれば、効果的で安定した操業を可能にする触媒再生設備を提供することができる。   According to this configuration, it is possible to provide a catalyst regeneration facility that enables effective and stable operation.

本発明の実施形態を、図面を参照して詳細に説明する。図1は、本実施形態に係る触媒再生方法に用いる触媒再生設備の概略全体構成を示す。   Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic overall configuration of a catalyst regeneration facility used in the catalyst regeneration method according to the present embodiment.

この触媒再生設備は、図外の焼却炉から排出される排ガス中の窒素酸化物を除去して排ガスを無害化する、脱硝触媒装置に内蔵されている脱硝触媒を再生するものであり、脱硝触媒装置を構成する脱硝反応塔1に近接して設けられていて、加熱手段である温風循環ヒータ3と、排ガスを送給して通流させる通流手段である温風循環ファン4と、温風を脱硝反応塔1に導く温風循環ダクト7とを備えていると共に、更に、循環系を形成するために排ガス入口側に設けた入口ダンパ6および出口側に設けた出口ダンパ5と、循環経路14にガス処理装置2を備えている。ここに、入口ダンパ6と出口ダンパ5とは閉鎖手段に相当する。   This catalyst regeneration facility regenerates the denitration catalyst built in the denitration catalyst device, which removes nitrogen oxides in the exhaust gas discharged from the incinerator outside the figure and renders the exhaust gas harmless. A hot air circulation heater 3 as a heating means, a hot air circulation fan 4 as a flow means for supplying and passing exhaust gas, and a warm air circulation heater 3 provided near the denitration reaction tower 1 constituting the apparatus. A hot air circulation duct 7 for guiding the wind to the denitration reaction tower 1, and an inlet damper 6 provided on the exhaust gas inlet side and an outlet damper 5 provided on the outlet side for forming a circulation system, and circulation The gas processing apparatus 2 is provided in the path 14. Here, the inlet damper 6 and the outlet damper 5 correspond to closing means.

この内、温風循環ヒータ3と温風循環ファン4と温風循環ダクト7と入口ダンパ6と出口ダンパ5とは、焼却炉を稼働させる際の立ち上げ時に、触媒反応塔1に内蔵されている触媒表面の結露を防止するために設置している既存の設備であり、本発明の実施のために新たに設けられたものではないため、脱硝触媒を再生する設備として処理コストをそれだけ低減できるものとなっている。   Among them, the hot air circulation heater 3, the hot air circulation fan 4, the hot air circulation duct 7, the inlet damper 6 and the outlet damper 5 are incorporated in the catalytic reaction tower 1 when the incinerator is started up. This is an existing facility installed to prevent condensation on the surface of the catalyst, and is not newly provided for the implementation of the present invention. Therefore, it can reduce the processing cost as a facility for regenerating the denitration catalyst. It has become a thing.

ガス処理装置2は、脱硝触媒を加熱して再生する際、発生する硫黄酸化物、塩化水素、アンモニアなどを除去するため、反応剤(例えば、消石灰など)充填層とアンモニアを分解する触媒(例えば、三元触媒など)を内蔵している。   When the gas treatment apparatus 2 heats and regenerates the denitration catalyst, in order to remove generated sulfur oxides, hydrogen chloride, ammonia and the like, a catalyst (for example, slaked lime etc.) packed bed and a catalyst for decomposing ammonia (for example, Built-in three-way catalyst.

更に、脱硝反応塔1の脱硝触媒を加熱再生中に循環系内の圧力を監視する圧力計13、再生ガスを引き抜くための流路を形成する再生ガス引き抜きダクト8、引き抜きガス量を調節するための再生ガス引抜手段の1種である再生ガス引き抜きダクトダンパ9、脱硝触媒内の圧力を調整するためのパージ弁11などを備えると共に、脱硝反応塔1の内部の温度を監視して、内部を適正な再生温度範囲内に調節するための温度計12を備えている。また、再生ガスの引き抜きには、既に設置されている誘引通風機10を流用して使用する。   Furthermore, a pressure gauge 13 for monitoring the pressure in the circulation system during heating regeneration of the denitration catalyst of the denitration reaction tower 1, a regeneration gas extraction duct 8 for forming a flow path for extracting regeneration gas, and adjusting the amount of extracted gas Is equipped with a regenerative gas extraction duct damper 9 which is a kind of regenerative gas extraction means, a purge valve 11 for adjusting the pressure in the denitration catalyst, etc., and the internal temperature of the denitration reaction tower 1 is monitored appropriately. There is provided a thermometer 12 for adjusting within a regenerative temperature range. In order to draw out the regeneration gas, the already-provided induction fan 10 is used.

以下に、図1に示す触媒再生設備を用いた触媒再生方法について説明する。まず、焼却炉(図示略)からの排ガス送給を停止し、脱硝触媒装置を構成する脱硝反応塔1の出口側ダクト20と入口側ダクト21とを遮断すべく、出口ダンパ5および入口ダンパ6を閉鎖し、排ガス流路を遮断して、脱硝触媒装置を閉鎖循環系におく。   The catalyst regeneration method using the catalyst regeneration facility shown in FIG. 1 will be described below. First, the exhaust gas supply from the incinerator (not shown) is stopped, and the outlet damper 5 and the inlet damper 6 are used to shut off the outlet side duct 20 and the inlet side duct 21 of the denitration reaction tower 1 constituting the denitration catalyst device. Is closed, the exhaust gas flow path is shut off, and the denitration catalyst device is placed in a closed circulation system.

次に、温風循環ヒータ3を所定温度(350〜550℃)に加熱して循環系内のガスを加熱・昇温させ、この加熱・昇温させたガスを、温風循環ファン4を用いて温風循環ダクト7を通して脱硝反応塔1へ送給して通気する。この場合、再生ガスの温度が350℃未満であると、脱硝触媒の再生効率が低くなって好ましくなく、550℃を超えると脱硝触媒が熱分解する可能性があり劣化するため好ましくない。   Next, the hot air circulation heater 3 is heated to a predetermined temperature (350 to 550 ° C.) to heat / heat the gas in the circulation system, and the heated / heated gas is heated using the hot air circulation fan 4. Then, it is sent to the denitration reaction tower 1 through the hot air circulation duct 7 and aerated. In this case, if the temperature of the regeneration gas is less than 350 ° C., the regeneration efficiency of the denitration catalyst is lowered, which is not preferable, and if it exceeds 550 ° C., the denitration catalyst may be thermally decomposed and deteriorated.

昇温された再生ガスが脱硝反応塔1へ送られ通気されると、脱硝触媒表面に堆積した被毒物質である酸性硫安、塩化アンモニウムなどが分解して、硫黄酸化物、塩化水素、アンモニアを発生させる。これらを含む再生ガスは、ガス処理装置2に送給されると、硫黄酸化物と塩化水素はガス処理装置2中の反応剤と反応して反応剤充填層中に固定される。アンモニアガスは、ガス処理装置2中に充填されたアンモニア分解触媒により、窒素に分解される。   When the heated regeneration gas is sent to the denitration reaction tower 1 and vented, poisonous substances deposited on the surface of the denitration catalyst, such as acidic ammonium sulfate and ammonium chloride, are decomposed and sulfur oxide, hydrogen chloride, and ammonia are removed. generate. When the regeneration gas containing these is supplied to the gas processing device 2, the sulfur oxide and hydrogen chloride react with the reactants in the gas processing device 2 and are fixed in the reactant packed bed. The ammonia gas is decomposed into nitrogen by the ammonia decomposition catalyst filled in the gas processing device 2.

ガス処理装置2により硫黄酸化物などを除去された再生ガスは、再度温風循環ヒータ3により所定温度(350〜550℃)に加熱され、脱硝反応塔1での脱硝触媒の再生に使用される。この動作を繰り返す。   The regeneration gas from which sulfur oxides and the like have been removed by the gas treatment device 2 is again heated to a predetermined temperature (350 to 550 ° C.) by the hot air circulation heater 3 and used for regeneration of the denitration catalyst in the denitration reaction tower 1. . This operation is repeated.

以上の再生工程において、圧力計13により脱硝触媒装置系内の圧力を常時監視しており、圧力が高くなれば、再生ガス引き抜きダクト8に設けた再生ガス引き抜きダクトダンパ9を開いて再生ガスを引き抜き、脱硝触媒装置系内の圧力を略一定の範囲になるように保持する。その場合、再生ガス引き抜きは誘引通風機10を使用してなされる。なお、上記循環系に、外部より新鮮空気を導入する空気導入口を設けていてもよい。   In the above regeneration process, the pressure inside the denitration catalyst system is constantly monitored by the pressure gauge 13. If the pressure increases, the regeneration gas extraction duct damper 9 provided in the regeneration gas extraction duct 8 is opened to extract the regeneration gas. The pressure in the denitration catalyst device system is maintained so as to be in a substantially constant range. In that case, regeneration gas extraction is performed using the induction fan 10. Note that an air inlet for introducing fresh air from the outside may be provided in the circulation system.

このように、本実施形態による再生方法によれば、脱硝触媒を脱硝反応塔1から取り出すことなく、再生することができるので、触媒の取り出し、輸送、取り付け時の衝撃などによって触媒が物理的に損傷するおそれがなく、それでいて温風循環ヒータや温風循環ファンや温風循環ダクトなどは、既に焼却炉の排ガス処理設備として設置されている既存の設備であるため、触媒再生する設備として新たな設備を必要とせず、触媒再生に要する新たな設備コストを不要にでき、結局、処理コストを低減できることになる。しかも、従来技術のように、2系列以上の焼却設備がある施設のみで再生でき、その内の1系列以上が稼働していないと再生することができないといった問題もない。もとより、再生ガスを循環利用するので、加熱再生するための熱エネルギーを顕著に軽減できる。   As described above, according to the regeneration method according to the present embodiment, the denitration catalyst can be regenerated without being removed from the denitration reaction tower 1, so that the catalyst is physically removed by impacts during removal, transportation, and installation of the catalyst. There is no risk of damage, and hot air circulation heaters, hot air circulation fans, hot air circulation ducts, etc. are existing equipment already installed as exhaust gas treatment equipment for incinerators. No equipment is required, and a new equipment cost required for catalyst regeneration can be made unnecessary, resulting in a reduction in processing costs. In addition, unlike the prior art, it can be regenerated only in a facility having two or more incineration facilities, and there is no problem that it cannot be regenerated unless one or more of them are in operation. Of course, since the regeneration gas is circulated and used, the heat energy for heating regeneration can be remarkably reduced.

〔別実施の形態〕
(1)上記実施形態において、排ガスは焼却炉から排出されたものを例に挙げて説明したが、被処理ガスとしての排ガスは、焼却炉に限定されるものではなく、要は脱硝する必要性のある排ガス発生源に対して用いられる脱硝触媒の再生に、本願発明を適用することができる。
[Another embodiment]
(1) In the above embodiment, the exhaust gas has been described by taking the exhaust gas discharged from the incinerator as an example. However, the exhaust gas as the gas to be treated is not limited to the incinerator, and the necessity is to denitrate. The present invention can be applied to regeneration of a denitration catalyst used for a certain exhaust gas generation source.

本発明の一実施形態に係る触媒再生方法に用いる触媒再生設備の概略全体構成図1 is a schematic overall configuration diagram of a catalyst regeneration facility used in a catalyst regeneration method according to an embodiment of the present invention.

符号の説明Explanation of symbols

1 脱硝触媒装置
2 ガス処理装置
5,6 閉鎖手段
9 再生ガス引抜手段
13 圧力計
DESCRIPTION OF SYMBOLS 1 Denitration catalyst apparatus 2 Gas processing apparatus 5,6 Closing means 9 Regenerative gas extraction means 13 Pressure gauge

Claims (4)

焼却炉停止時に、焼却設備から発生する窒素酸化物を含む排ガスを通して脱硝する脱硝触媒装置の出口側ダクトと入口側ダクトとを閉鎖し排ガス流路を遮断し、系内のガスを350〜550℃に加熱して前記脱硝触媒装置に送給する循環系において、前記脱硝触媒装置の脱硝触媒に堆積した被毒物質から発生するガス成分を前記循環系に設けたガス処理装置により分解除去したガスを再生ガスとし、この再生ガスを再度前記温度範囲まで加熱し、前記脱硝触媒装置へ送給して脱硝触媒装置中の脱硝触媒を再生する触媒再生方法。 When the incinerator is stopped, the outlet side duct and the inlet side duct of the NOx removal catalyst device for removing NOx through the exhaust gas containing nitrogen oxides generated from the incinerator are closed, the exhaust gas passage is shut off, and the gas in the system is 350 to 550 ° C. In the circulation system that is heated and supplied to the denitration catalyst device, the gas component generated from poisonous substances deposited on the denitration catalyst of the denitration catalyst device is decomposed and removed by the gas treatment device provided in the circulation system. A catalyst regeneration method in which the regeneration gas is reheated to the temperature range and fed to the denitration catalyst device to regenerate the denitration catalyst in the denitration catalyst device. 前記循環系内に設けた圧力計により循環系内の圧力を監視し、圧力が高くなれば、前記循環系内の再生ガスを引き抜き、前記循環系内の圧力を略一定の範囲になるように保持する請求項1の触媒再生方法。 The pressure in the circulation system is monitored by a pressure gauge provided in the circulation system, and when the pressure increases, the regeneration gas in the circulation system is withdrawn so that the pressure in the circulation system is in a substantially constant range. The catalyst regeneration method according to claim 1, wherein the catalyst is regenerated. 窒素酸化物を含む排ガスを通して脱硝する脱硝触媒装置と、この脱硝触媒装置の出口側ダクトと入口側ダクトとを閉鎖して排ガス流路を遮断する循環系を形成可能な閉鎖手段と、
系内のガスを加熱して生成した再生ガスを通流させることにより、この再生ガス中に含まれる、前記脱硝触媒装置の脱硝触媒に堆積した被毒物質から発生するガス成分を分解除去して再度再生ガスを生成するガス処理装置と、
前記再生ガスを前記循環系内に通流させる通流手段と、この通流手段により通流される前記再生ガスを加熱する加熱手段と、を前記循環系内に備え、加熱した前記再生ガスを前記脱硝触媒装置へ送給して脱硝触媒装置中の脱硝触媒を再生可能にする触媒再生設備。
A denitration catalyst device that denitrates through exhaust gas containing nitrogen oxides, and a closing means capable of forming a circulation system that closes the outlet side duct and the inlet side duct of the denitration catalyst device to block the exhaust gas flow path;
By causing the regeneration gas generated by heating the gas in the system to flow, the gas components generated in the denitration catalyst of the denitration catalyst device contained in the regeneration gas are decomposed and removed. A gas processing device for generating regenerated gas again;
The circulation system includes a flow means for flowing the regeneration gas into the circulation system, and a heating means for heating the regeneration gas passed by the flow means, and the heated regeneration gas is added to the circulation system. A catalyst regeneration facility that supplies the denitration catalyst device to regenerate the denitration catalyst in the denitration catalyst device.
前記循環系内の圧力を監視する圧力計が設けられていると共に、この圧力計の測定に応じて前記再生ガスを引き抜き、前記循環系内の圧力を略一定の範囲になるように保持可能な再生ガス引抜手段が設けられている請求項3の触媒再生設備。 A pressure gauge for monitoring the pressure in the circulation system is provided, and the regeneration gas can be withdrawn according to the measurement of the pressure gauge, and the pressure in the circulation system can be maintained within a substantially constant range. 4. The catalyst regeneration facility according to claim 3, wherein regeneration gas extraction means is provided.
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