JPS62112909A - Catalyst combustion device - Google Patents

Abstract

PURPOSE:To enable a clean combustion restricting a generation of non-ignited gas and carbon monoxide to be carried out by a method wherein a combustion catalyst having several through holes therein, heat insulator and a partition plate are piled up in sequence within a burner case, an oxidation reaction with the combustion air is carried out within the combustion catalyst to perform a combustion. CONSTITUTION:Oxidation catalyst such as Pt, is carried on a porous heat- resistant fibrous ceramic complex, a combustion catalyst 8 having several through holes 7 at its entire surface and a protective net 9 for preventing a flexture or a positional displacement of the catalyst 8 are piled up in sequence in a burner case 1. Combustion air convected along the surface of the combustion catalyst 8 is passed through the holes 7 ad guided to a deep part of the combustion catalyst 8 to diffuse between the heat-resistant ceramic fibers of the combustion catalyst 8, and sufficiently diffused in the combustion catalyst 8 and supplied to it. As a result, a catalyst oxidation reaction with the fuel gas diffused through the heat insulator 5 is promoted and an increased rate of slip caused by the occurrence of non-ignited gas and a generation of toxic gas such as carbon monoxide are substantially decreased.

Description

【発明の詳細な説明】 産業上の利用分骨 本発明は、都市ガス、天然ガス、ＬＰガス等の気体燃料
を燃焼用触媒体上に拡散させ、燃焼用空気によって前記
の気体燃料を触媒酸化反応させて、゛生成した反応熱を
利用する触媒燃焼装置に関する。Detailed Description of the Invention Industrial Application The present invention diffuses gaseous fuel such as city gas, natural gas, LP gas, etc. onto a combustion catalyst, and catalytically oxidizes the gaseous fuel with combustion air. This invention relates to a catalytic combustion device that utilizes the reaction heat generated by a reaction.

従来の技術 従来この種の触媒燃焼装置は、第３図に示すよ２へ−７ うに、バーナケース１ａの底部にガス室２ａを構成し、
その下流側にラス鋼等からなる仕切板３ａ。BACKGROUND OF THE INVENTION Conventionally, this type of catalytic combustion apparatus has a gas chamber 2a at the bottom of a burner case 1a, as shown in FIG.
A partition plate 3a made of lath steel or the like is provided on the downstream side thereof.

保温材４　ａ　、多孔質耐熱性セラミック繊維集合体３
″゛・′４・門等０酸化触媒を担持し“燃焼用触媒体５
ａが積層されている。Heat insulating material 4a, porous heat-resistant ceramic fiber aggregate 3
``゛・'4・gate etc. 0 oxidation catalyst supported ``combustion catalyst body 5
a are stacked.

発明が解決しようとする問題点 しかしながら上記のような構成では、燃焼用触媒体５ａ
が比較的嵩比重の高い耐熱性繊維セラミック集合体から
なり、多数の透孔を有していないため、燃焼時の燃焼空
気の供給が耐熱性繊維間を拡散して燃焼用触媒体５ａ内
部に十分供給されず、空気不足となって完全なる触媒酸
化反応が成し得ず、未燃焼成ガスの発生、すなわちスリ
ップ率の増大や、−酸化炭素等の有害ガスの発生量が多
くなる欠点を有していた。Problems to be Solved by the Invention However, in the above configuration, the combustion catalyst body 5a
is made of a heat-resistant fiber ceramic aggregate with a relatively high bulk specific gravity and does not have many through holes, so that the combustion air supplied during combustion diffuses between the heat-resistant fibers and enters the inside of the combustion catalyst 5a. If sufficient air is not supplied, a complete catalytic oxidation reaction cannot be achieved due to lack of air, resulting in the generation of unburned gas, which increases the slip ratio, and increases the amount of harmful gases such as -carbon oxide. had.

本発明はかかる従来の問題点を解消するもので１、触媒
燃焼装置あ燃焼−における未燃焼ガスや一酸化炭素等の
不完全燃焼ガスの発生を抑制し、きれいな燃焼化を図る
ことを目的とする。The present invention solves these conventional problems, and aims to achieve clean combustion by suppressing the generation of unburned gas and incomplete combustion gas such as carbon monoxide in a catalytic combustion device. do.

問題点を解決するための手段 ３ベーン 上記問題点を解決するために本発明の触媒燃焼装置は、
バーナケース内で多数の透孔を有した燃−焼用触媒体、
保温材、仕切板を順次積層し、燃焼用触媒体内で燃焼空
気と酸化反応させ燃焼を行う構成としたものである。Means for Solving the Problems Three Vanes In order to solve the above problems, the catalytic combustion apparatus of the present invention includes:
A combustion catalyst body with a large number of through holes inside the burner case,
The structure is such that heat insulating material and partition plates are sequentially laminated, and combustion occurs through an oxidation reaction with combustion air within the combustion catalyst body.

作　　用 本発明は上記した構成によって、燃焼用触媒体上に多数
設けた透孔から、燃焼用触媒体内に十分なる拡散空気を
得て、触媒酸化反応を促進し、未燃焼ガスや一酸化炭素
の発生を抑制してクリーン燃焼化が図れるものである。Function: With the above-described configuration, the present invention obtains sufficient diffused air into the combustion catalyst body through the numerous through holes provided on the combustion catalyst body, promotes the catalytic oxidation reaction, and removes unburned gas and carbon monoxide. It is possible to achieve clean combustion by suppressing the generation of .

実施例 以下、本発明の実施例を添付図面にもとづいて説明する
。Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

第１図、第２図において、耐熱性金属からなるバーナケ
ース１の底部には、ガス室２と燃料ガス流入口３があり
、ガス室２の下流側には金属製打゛　　抜板より構成し
た仕切板４、耐熱性繊維セラミ・ツク集合体よりなる保
温材５、ニクロムヒータ線から構成したヒータ体６、多
孔質耐熱性繊維セラミック集合体にＲｈ、　Ｐｄ、　Ｐ
ｔ等の酸化触媒を担持し、全面に多数の透孔７を有する
燃焼用触媒体８、前記燃焼…触媒体８のたわみ、位置ず
れを防止するための保護ネット９が順次積層され設置さ
れている。一方、燃焼用触媒体８の全面に設けた多数の
透孔７は、触媒燃焼に必要な燃焼用空気を燃焼用触媒体
８内に十分に供給し、しかも、未燃焼ガスが漏出しない
孔径、例えば２〜１０ｔｎＷＬの孔径に設定しである。In Figures 1 and 2, the bottom of a burner case 1 made of heat-resistant metal has a gas chamber 2 and a fuel gas inlet 3, and the downstream side of the gas chamber 2 is made of a stamped metal plate. A heat insulating material 5 made of a heat-resistant fiber-ceramic aggregate, a heater body 6 made of nichrome heater wire, and a porous heat-resistant fiber-ceramic aggregate containing Rh, Pd, and P.
A combustion catalyst body 8 supporting an oxidation catalyst such as T and having a large number of through holes 7 on the entire surface, and a protective net 9 for preventing deflection and displacement of the combustion catalyst body 8 are sequentially laminated and installed. There is. On the other hand, the large number of through holes 7 provided on the entire surface of the combustion catalyst body 8 supply a sufficient amount of combustion air necessary for catalytic combustion into the combustion catalyst body 8, and have a hole diameter that prevents unburned gas from leaking. For example, the pore diameter is set to 2 to 10 tnWL.

また燃焼用触媒体日内あるいは燃焼用触媒体８とヒータ
体６との間には、燃焼用触媒体８の燃焼温度を検知す、
る熱電対１０がバーナケース１を貫通して設置されてい
る。　　□上記構成において、ヒータ体６に通電すると
、ヒータ体６からの発熱が保温材５及び燃焼用触媒体８
の双方に伝熱され、燃焼用触媒体８の温度が活性化温度
、すなわち着火可能な温度に到達したことを熱電対１０
が検知すると、電磁弁（図示せず）に通電され、燃料ガ
ス流入１」３よりガス室２内に燃料ガスが一定流量で供
給される。燃料ガスはある程度昇温しでいる保温材５内
を拡散するこ５　ページ とにより、自らも昇温しで燃焼用触媒体８の温度をあま
り低下させることなく燃焼用触媒体８内に拡散する。こ
の際、燃焼用触媒体８内では、外気から対流して来た燃
焼用空気が多数の透孔７内に導かれ、耐熱性セラミック
繊維間隙より燃焼用触。In addition, between the combustion catalyst body 8 and the heater body 6, there is a device for detecting the combustion temperature of the combustion catalyst body 8.
A thermocouple 10 is installed passing through the burner case 1. □In the above configuration, when the heater body 6 is energized, the heat generated from the heater body 6 is transferred to the heat insulating material 5 and the combustion catalyst body 8.
The thermocouple 10 indicates that the temperature of the combustion catalyst 8 has reached the activation temperature, that is, the temperature at which ignition is possible.
When detected, a solenoid valve (not shown) is energized, and fuel gas is supplied into the gas chamber 2 from the fuel gas inflow 1'' 3 at a constant flow rate. The fuel gas diffuses inside the heat insulating material 5 whose temperature has risen to a certain extent, and as a result, the fuel gas also rises in temperature and diffuses into the combustion catalyst body 8 without significantly lowering the temperature of the combustion catalyst body 8. . At this time, within the combustion catalyst body 8, combustion air convected from the outside air is guided into a large number of through holes 7, and is passed through the gaps between the heat-resistant ceramic fibers.

媒体８内に十分に拡散し、保温材５内を拡散して来た燃
料ガスと触媒酸化反応を行い、二酸化炭素と水蒸気とな
って触媒燃焼が開始される。さらにこの様な触媒反応が
燃焼用触媒体８全体に”及び触媒反応は安定化する。こ
の時点で熱電対１０は触媒燃焼の安定温度を温度上昇に
よって検知し、同時にヒータ体６への通電も停止きれ、
完全な賜燃焼による触媒燃焼状態が形成されて、燃焼用
触媒体８の温度が４５０〜６００°Ｃ程度を保持し定常
燃焼が持続される。It sufficiently diffuses into the medium 8 and undergoes a catalytic oxidation reaction with the fuel gas that has diffused within the heat insulating material 5, turning into carbon dioxide and water vapor, and catalytic combustion begins. Furthermore, such a catalytic reaction spreads over the entire combustion catalyst body 8 and the catalytic reaction becomes stable. At this point, the thermocouple 10 detects the stable temperature of catalytic combustion by the temperature rise, and at the same time, the heater body 6 is also energized. Stop,
A catalytic combustion state is formed due to complete combustion, and the temperature of the combustion catalyst body 8 is maintained at about 450 to 600°C, and steady combustion is maintained.

一方、触媒燃焼装置では燃焼箱触媒体８の熱劣□ 化と防止するため、燃料ガスと空気との予混合は行えず
全２次空気燃焼を行う必要性が有り、触媒燃焼体８内へ
の燃焼用空気の十分なる拡散を得る□ことが、完全燃焼
を行わしめる前提となる。On the other hand, in a catalytic combustion device, in order to prevent thermal deterioration of the combustion box catalyst body 8, premixing of fuel gas and air cannot be performed and it is necessary to perform all secondary air combustion. Obtaining sufficient diffusion of the combustion air □ is a prerequisite for complete combustion.

６ヘー／゛ 本実施例では、燃焼用触媒体８の全面に渡って多数の透
孔７を設けているので、燃焼用触媒体８表面に沿って対
流してきた燃焼用空気が、透孔７を通して燃焼用触媒体
８の深部へと導かれ、燃焼用触媒体８の耐熱性、セラミ
ック繊維間を拡散して、燃焼用触媒体８内部に十分に拡
散して供給される。6 h/゛In this embodiment, a large number of through holes 7 are provided over the entire surface of the combustion catalyst body 8, so that the combustion air that has convected along the surface of the combustion catalyst body 8 flows through the through holes 7. It is guided deep into the combustion catalyst body 8 through the combustion catalyst body 8, diffuses between the heat-resistant ceramic fibers of the combustion catalyst body 8, and is sufficiently diffused and supplied into the combustion catalyst body 8.

この結果、保温材５を通じて拡散してきた燃料ガスと触
媒酸化反応が促進され未燃焼ガス発生によるスリップ率
の増大や、−酸化炭素等の有害ガスの発生を大巾に減少
したクリーン燃焼が成し得るものである。As a result, the catalytic oxidation reaction with the fuel gas diffused through the heat insulating material 5 is promoted, resulting in an increase in the slip ratio due to the generation of unburned gas and a clean combustion in which the generation of harmful gases such as -carbon oxide is greatly reduced. It's something you get.

発明の効果 以上のように本発明の触媒燃焼装置によれば次の効果が
ある。、すなわち、燃焼用触媒体の全面に渡って多数の
透孔を設けることで、燃焼用触媒体内への燃焼用空気の
拡散を促進し、未燃焼ガスや、−酸化炭素の発生を抑制
したクリーン燃焼が可能となる。Effects of the Invention As described above, the catalytic combustion apparatus of the present invention has the following effects. In other words, by providing a large number of holes throughout the combustion catalyst body, it is possible to promote the diffusion of combustion air into the combustion catalyst body, thereby suppressing the generation of unburned gas and carbon oxide. Combustion becomes possible.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明一実施例における触媒燃焼装置７　ペー
ジ の縦断面図、第２図は第１図の要部切欠平面図、第３図
は従来の触媒燃焼装置の縦断面図である。 １・・・・バーナケース、５・・・・保温材、７・・・
・・・透孔、８・・・・燃焼用触媒体。FIG. 1 is a vertical cross-sectional view of page 7 of a catalytic combustion device according to an embodiment of the present invention, FIG. 2 is a cutaway plan view of the main part of FIG. 1, and FIG. 3 is a vertical cross-sectional view of a conventional catalytic combustion device. 1...Burner case, 5...Heat insulation material, 7...
...Through hole, 8...Catalyst for combustion.

Claims (2)

【特許請求の範囲】[Claims] （１）多孔質耐熱性セラミック繊維に酸化触媒を担持す
ると共に多数の透孔を有した燃焼用触媒体と、この上流
側に保温材と積層してバーナケース内に収納してなる触
媒燃焼装置。(1) A catalytic combustion device consisting of a combustion catalyst body that supports an oxidation catalyst on porous heat-resistant ceramic fibers and has a large number of through holes, and a heat insulating material layered on the upstream side of the combustion catalyst body and housed in a burner case. . （２）酸化触媒として、Ｐｔ、Ｐｄ、Ｒｈ等の白金族金
属の内１種以上、あるいはＦｅ、Ｃｏ、Ｎｉ等の遷移金
属の酸化物の内１種類以上を混入した特許請求の範囲第
１項記載の触媒燃焼装置。(2) As an oxidation catalyst, one or more of platinum group metals such as Pt, Pd, and Rh, or one or more of transition metal oxides such as Fe, Co, and Ni are mixed. Catalytic combustion device as described in section.