JPH0335573B2 - - Google Patents
Info
- Publication number
- JPH0335573B2 JPH0335573B2 JP59269033A JP26903384A JPH0335573B2 JP H0335573 B2 JPH0335573 B2 JP H0335573B2 JP 59269033 A JP59269033 A JP 59269033A JP 26903384 A JP26903384 A JP 26903384A JP H0335573 B2 JPH0335573 B2 JP H0335573B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- catalyst
- fuel
- combustion catalyst
- catalytic burner
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003054 catalyst Substances 0.000 claims description 71
- 238000002485 combustion reaction Methods 0.000 claims description 46
- 239000000446 fuel Substances 0.000 claims description 22
- 238000006477 desulfuration reaction Methods 0.000 claims description 20
- 230000023556 desulfurization Effects 0.000 claims description 20
- 230000003197 catalytic effect Effects 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052703 rhodium Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- -1 platinum group metals Chemical class 0.000 claims description 2
- 239000002759 woven fabric Substances 0.000 claims 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 229910052746 lanthanum Inorganic materials 0.000 claims 1
- 229910052763 palladium Inorganic materials 0.000 claims 1
- 239000002737 fuel gas Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 238000007084 catalytic combustion reaction Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 239000003205 fragrance Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000010718 Oxidation Activity Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000005987 sulfurization reaction Methods 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005486 sulfidation Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/18—Radiant burners using catalysis for flameless combustion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、触媒上に気体燃料あるいは気化させ
た液体燃料を供給し、燃焼用空気によつて前記の
燃料を触媒酸化させ、反応により生じた燃焼熱お
よび輻射熱を利用する触媒バーナに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention supplies gaseous fuel or vaporized liquid fuel onto a catalyst, catalytically oxidizes the fuel with combustion air, and oxidizes the combustion produced by the reaction. This invention relates to a catalytic burner that utilizes heat and radiant heat.
従来の技術
従来この種の触媒バーナは、第２図に示す様
に、多数の孔を有した燃料分散管１を裏面から設
置したバーナケース２内に、拡散材３とPt、Rh、
Pd等の白金族金属を用いた酸化触媒を担持した
燃焼用触媒層４を設けた構成になつており、燃料
分散管１から送入されたガス燃料は拡散材３中を
均一に拡散しながら燃焼用触媒層４内に至り、何
らかの着火手段で着火された後、燃焼用触媒層４
の表面上で定常的な触媒燃焼が行われる様になつ
ていた。（例えば、特開昭58−213110号公報）
発明が解決しようとする問題点
しかしながら、都市ガス等の通常のガス燃料に
は、Ｓ分を含有したメルカプタン系付臭剤が７〜
10ppm程度の微量であるが混入されている。一
方、燃焼用触媒層４に担持されている白金族金属
系の酸化触媒は前記のＳ分と容易に結合して硫化
物、すなわちPtS、PdS、PhS等を形成し急速に
酸化活性を失うことが知られている。したがつ
て、７〜10ppm程度の極く微量の付臭剤であつて
も、5000時間、10000時間といつた長時間の触媒
燃焼を行わせた場合、酸化触媒の活性低下を招き
結果的に未燃ガス量の増大につながることは必至
であつた。Conventional technology As shown in FIG. 2, this type of catalytic burner conventionally has a burner case 2 in which a fuel dispersion pipe 1 having a large number of holes is installed from the back, and a diffusion material 3 and Pt, Rh,
The structure includes a combustion catalyst layer 4 supporting an oxidation catalyst using a platinum group metal such as Pd, and the gaseous fuel fed from the fuel dispersion tube 1 is uniformly diffused through the diffusion material 3. After reaching the combustion catalyst layer 4 and being ignited by some ignition means, the combustion catalyst layer 4
Steady catalytic combustion was taking place on the surface of the (For example, Japanese Unexamined Patent Publication No. 58-213110) Problems to be Solved by the Invention However, in ordinary gas fuel such as city gas, mercaptan-based odorants containing S content are
Although it is a trace amount of about 10ppm, it is mixed in. On the other hand, the platinum group metal-based oxidation catalyst supported on the combustion catalyst layer 4 easily combines with the S content to form sulfides, such as PtS, PdS, PhS, etc., and rapidly loses its oxidation activity. It has been known. Therefore, even if the amount of odorant is extremely small, about 7 to 10 ppm, if catalytic combustion is carried out for a long time such as 5,000 or 10,000 hours, the activity of the oxidation catalyst will decrease and the result will be This inevitably led to an increase in the amount of unburned gas.
本発明はかかる従来の問題点を解消するもの
で、燃料中の付臭剤のＳ分の酸化触媒に対する影
響を最小限に抑え、触媒活性の寿命を伸ばすこと
を目的とする。 The present invention solves these conventional problems, and aims to minimize the influence of the S content of the odorant in the fuel on the oxidation catalyst and extend the life of the catalyst activity.
問題点を解決するための手段
上記の問題点を解決するために、本発明の触媒
バーナは耐熱性セラミツク担体に酸化触媒を担持
した燃焼用触媒体と燃料供給部、燃料中のＳ分を
除去するための脱硫触媒層とからなり、燃料供給
部と燃焼用触媒体の間に脱硫触媒層を配置したも
のである。Means for Solving the Problems In order to solve the above problems, the catalytic burner of the present invention includes a combustion catalyst body in which an oxidation catalyst is supported on a heat-resistant ceramic carrier, a fuel supply section, and a fuel supply section that removes the S content in the fuel. The desulfurization catalyst layer is arranged between the fuel supply section and the combustion catalyst.
作 用
本発明は上記の構成によつて、燃料供給部から
供給された燃料が燃焼用触媒体に至る以前に必ず
脱硫触媒層を通過するため、燃料ガス中のＳ分は
大半が脱硫触媒層に吸着され、燃料ガスが燃焼用
触媒体に至る時点では、燃料ガス中のＳ分の含有
量は低下するため燃焼用触媒体の表面での触媒燃
焼の際に起こる触媒成分の硫化の割合も低下する
ため、硫化による触媒活性の低下は大幅に抑制で
きる。Effects According to the present invention, with the above configuration, the fuel supplied from the fuel supply section always passes through the desulfurization catalyst layer before reaching the combustion catalyst, so that most of the S content in the fuel gas is contained in the desulfurization catalyst layer. At the time when the fuel gas reaches the combustion catalyst, the S content in the fuel gas decreases, so the rate of sulfurization of the catalyst components that occurs during catalytic combustion on the surface of the combustion catalyst decreases. Therefore, the decrease in catalyst activity due to sulfidation can be significantly suppressed.
実施例
以下、本発明の実施例を添付の図面に基づいて
説明を行う。Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.
第１図に於て、耐熱性金属からなるバーナケー
ス１の下部には燃料分散ノズル２が貫通設置さ
れ、高い開孔度を有する金網あるいはラス網形式
のスペーサ３と前記バーナケース１によりガス室
４が形成されている。一方、スペーサ３から前方
には、スペーサ３に近接した部分から耐熱性セラ
ミツク繊維成型体からなる保温拡散材５、
Al2O3・SiO2等の微小細孔を有しかつ100〜200
m2／ｇといつた高い比表面積を有する耐熱性セラ
ミツク繊維成型体を担体とし、脱硫触媒として酸
化亜鉛（ZnO）を10％程度担持した本発明による
脱硫触媒層６、ニクロムヒータ線を一定のパター
ンで分布させた予熱器７、脱硫触媒層６と同様の
担体に0.5〜１％程度のRhを担持した燃焼用触媒
体８があり、燃焼用触媒体８の前面は、通気抵抗
をほとんど無視できる程度の高い開孔度を有する
金網あるいはラス網からなる保護ネツト９によつ
て保持されており、保護ネツト９はその外周部を
保持金具１０によつて固定されている。また、燃
焼用触媒体８の下部には燃焼温度検知用の熱電対
１１が設置されている。 In FIG. 1, a fuel dispersion nozzle 2 is installed through the lower part of a burner case 1 made of heat-resistant metal, and a gas chamber is formed by a spacer 3 in the form of a wire mesh or lath mesh having a high degree of aperture and the burner case 1. 4 is formed. On the other hand, in front of the spacer 3, from a portion close to the spacer 3, a heat-retaining diffusion material 5 made of a heat-resistant ceramic fiber molded body,
Al 2 O 3 / SiO 2 etc. with micro pores and 100 to 200
The desulfurization catalyst layer 6 according to the present invention, which uses a heat-resistant ceramic fiber molded body having a high specific surface area of m 2 /g as a carrier and supports about 10% zinc oxide (ZnO) as a desulfurization catalyst, and a nichrome heater wire at a constant rate. There is a preheater 7 distributed in a pattern, and a combustion catalyst 8 carrying about 0.5 to 1% Rh on the same carrier as the desulfurization catalyst layer 6, and the front side of the combustion catalyst 8 almost ignores ventilation resistance. It is held by a protective net 9 made of wire mesh or lath mesh having as high aperture as possible, and the protective net 9 is fixed at its outer periphery by a holding fitting 10. Further, a thermocouple 11 for detecting combustion temperature is installed at the lower part of the combustion catalyst body 8.
次に上記構成に於ける作用を説明する。 Next, the operation of the above configuration will be explained.
予熱器７に通電されると、発生した熱は脱硫触
媒層６、燃焼用触媒体８の双方に伝達され、双方
が活性化温度に至るまで予熱器７へ通電が続けら
れる。燃焼用触媒体８の温度が260〜300℃程度に
到達したことを燃焼温度検知用の熱電対１１が感
知すると、燃料ガス供給用の電磁弁（図示せず）
に通電され、燃料ガスが供給される。供給された
燃料ガスは燃料分散ノズル２によつてガス室４内
に充満し、保温拡散材５内部を均一に拡散しなが
ら脱硫触媒層６を通過し、燃焼用触媒体８に至
る。燃料ガスは燃焼用触媒体８内部で一部酸化反
応を起こし、燃焼用触媒体８の温度を内部から上
昇させながら、燃焼用触媒体８の中央部から表面
部に至り、拡散してくる大量の燃焼用空気によつ
て急激に反応し、発生した反応熱によりさらに燃
焼用触媒体８の温度を上昇させ、着火を完了す
る。着火により燃焼用触媒体８が一定の温度に到
達したことを燃焼温度検知用の熱電対１１が感知
すると、予熱器７への通電が停止され、燃焼用触
媒体８上での触媒燃焼は450〜550℃程度の定常燃
焼となる。この時、燃焼用触媒体８の裏面と接触
している脱硫触媒層６は、燃焼用触媒体８からの
伝熱を受け、350℃程度まで温度上昇する。脱硫
触媒層６に担持されている、酸化亜鉛は上記の
350℃程度の温度で最も高いＳの吸着性能を有す
るため、燃料ガスは脱硫触媒層６を通過する際
に、含有する付臭剤中のＳ分が酸化亜鉛によつて
吸着され燃焼用触媒体８へ至る時点で燃料ガス中
のＳの含有量は1ppm以下となり、燃焼用触媒体
８への影響を最小限に抑制できる。したがつて、
燃焼用触媒体８の酸化活性の寿命は、触媒燃焼に
よる温度上昇が招く触媒金属粒子のシンタリング
現象、あるいは燃料ガスの一部熱分解によるカー
ボンの付着等による劣化を考えるだけで良く、硫
化による急速な活性劣化は防止できる。また、燃
焼用触媒体８は担体として、ｒ−Al2O3、
Al2O3・SiO2等の高い比表面積を有し、800〜900
℃程度の耐熱性を持つているため、酸化触媒金属
の粒子の大きさも非常に微細な状態を保ち、450
〜550℃程度の燃焼温度では上記の触媒金属のシ
ンタリングの進行も非常に緩慢であるため、5000
時間以上の長時間でも比較的高い触媒活性を保持
することができる。 When the preheater 7 is energized, the generated heat is transferred to both the desulfurization catalyst layer 6 and the combustion catalyst body 8, and the energization to the preheater 7 is continued until both reach the activation temperature. When the combustion temperature detection thermocouple 11 senses that the temperature of the combustion catalyst 8 has reached approximately 260 to 300°C, a solenoid valve (not shown) for fuel gas supply is activated.
is energized and fuel gas is supplied. The supplied fuel gas fills the gas chamber 4 through the fuel dispersion nozzle 2, passes through the desulfurization catalyst layer 6 while uniformly diffusing inside the heat-insulating diffusion material 5, and reaches the combustion catalyst body 8. The fuel gas partially undergoes an oxidation reaction inside the combustion catalyst body 8, and while increasing the temperature of the combustion catalyst body 8 from inside, a large amount of fuel gas diffuses from the center to the surface of the combustion catalyst body 8. The combustion air reacts rapidly, and the generated reaction heat further increases the temperature of the combustion catalyst 8, completing ignition. When the combustion temperature detection thermocouple 11 senses that the combustion catalyst body 8 has reached a certain temperature due to ignition, the power supply to the preheater 7 is stopped, and the catalytic combustion on the combustion catalyst body 8 reaches a temperature of 450℃. Steady combustion occurs at ~550℃. At this time, the desulfurization catalyst layer 6 that is in contact with the back surface of the combustion catalyst body 8 receives heat transferred from the combustion catalyst body 8, and its temperature rises to about 350°C. The zinc oxide supported on the desulfurization catalyst layer 6 is
Since it has the highest S adsorption performance at a temperature of about 350°C, when the fuel gas passes through the desulfurization catalyst layer 6, the S component in the odorant contained in the fuel gas is adsorbed by zinc oxide, and the combustion catalyst 8, the content of S in the fuel gas becomes 1 ppm or less, and the influence on the combustion catalyst 8 can be suppressed to a minimum. Therefore,
The lifespan of the oxidation activity of the combustion catalyst body 8 can be determined only by considering deterioration due to sintering of catalyst metal particles caused by temperature rise due to catalytic combustion, or carbon adhesion due to partial thermal decomposition of fuel gas, and deterioration due to sulfurization. Rapid deterioration of activity can be prevented. Further, the combustion catalyst body 8 uses r-Al 2 O 3 , r-Al 2 O 3 ,
Has a high specific surface area such as Al 2 O 3 / SiO 2 , 800 ~ 900
Because it has a heat resistance of about 450°C, the oxidation catalyst metal particles remain extremely fine.
At combustion temperatures of ~550°C, the sintering of the catalyst metal described above is very slow, so
Relatively high catalytic activity can be maintained even for long periods of time, such as hours or more.
発明の効果
以上の様に本発明の触媒バーナによれば次に列
記する効果が得られる。Effects of the Invention As described above, the catalytic burner of the present invention provides the following effects.
(1) 燃焼用触媒体の裏面に脱硫触媒層を設け、燃
料ガスが脱硫触媒層を先に通過する構成となつ
ているため、燃焼用触媒体からの燃焼熱を効率
良く脱硫触媒層に伝えることができ、脱硫触媒
層の活性化温度を保持できる。(1) A desulfurization catalyst layer is provided on the back side of the combustion catalyst, and the fuel gas is configured to pass through the desulfurization catalyst layer first, so combustion heat from the combustion catalyst is efficiently transferred to the desulfurization catalyst layer. The activation temperature of the desulfurization catalyst layer can be maintained.
(2) 上記構成により、燃料ガス中のＳ分は脱硫触
媒層に大部分吸着され、燃焼用触媒体へは純度
の高い炭化水素燃料が供給されるため、燃焼用
触媒体の触媒金属の硫化による失活は抑制でき
る。(2) With the above configuration, most of the S content in the fuel gas is adsorbed in the desulfurization catalyst layer, and highly pure hydrocarbon fuel is supplied to the combustion catalyst, so that the catalytic metal in the combustion catalyst is sulfurized. deactivation caused by this can be suppressed.
(3) 上記構成により、燃焼用触媒体の長寿命化が
行える。(3) With the above configuration, the life of the combustion catalyst can be extended.
第１図は本発明の一実施例の触媒バーナの縦断
面図、第２図は従来の触媒バーナの縦断面図であ
る。
２……燃料分散ノズル、６……脱硫触媒層、８
……燃焼用触媒体。
FIG. 1 is a longitudinal sectional view of a catalytic burner according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional catalytic burner. 2... Fuel dispersion nozzle, 6... Desulfurization catalyst layer, 8
...Catalyst for combustion.
Claims (1)
ラミツク織布、またはセラミツク多孔体等の内１
種類を担体として、この担体上に酸化触媒を担持
した燃焼用触媒体と、ガス燃料あるいは気化させ
た液体燃料を前記の燃焼用触媒体中へ供給する燃
料供給部と、燃焼用触媒体と燃料供給部の間に設
けた脱硫触媒層からなる触媒バーナ。 ２ 燃焼用触媒体の担体として、γ−Al2O3、
Al2O3・SiO2、SiO2等の多孔質かつ高い比表面積
を有するセラミツクスを用いた特許請求の範囲第
１項記載の触媒バーナ。 ３ 酸化触媒として、Pt、Pd、Rh等の白金族金
属の内１種類以上、またはLa、Co、Ce、Sr等か
らなるペロブスカイト型構造を有する酸化物等を
用いた特許請求の範囲第１項記載の触媒バーナ。 ４ 脱硫触媒層は、セラミツク繊維の非圧縮成型
体、あるいはセラミツク織布を担体とし、脱硫触
媒として活性炭、あるいは酸化亜鉛（ZnO）等の
内１種類を用いた特許請求の範囲第１項記載の触
媒バーナ。[Scope of Claims] 1. 1 of non-compressed molded ceramic fibers, ceramic woven fabrics, ceramic porous bodies, etc.
a combustion catalyst body in which an oxidation catalyst is supported on the carrier; a fuel supply section that supplies gaseous fuel or vaporized liquid fuel into the combustion catalyst body; a combustion catalyst body and a fuel supply unit; A catalytic burner consisting of a desulfurization catalyst layer provided between a supply section. 2 As a support for the combustion catalyst, γ-Al 2 O 3 ,
The catalytic burner according to claim 1, which uses ceramics such as Al 2 O 3 .SiO 2 and SiO 2 that are porous and have a high specific surface area. 3. Claim 1 in which one or more of platinum group metals such as Pt, Pd, Rh, etc., or oxides having a perovskite structure consisting of La, Co, Ce, Sr, etc. are used as the oxidation catalyst. Catalytic burner as described. 4. The desulfurization catalyst layer is a non-compression molded body of ceramic fibers or a ceramic woven fabric as a carrier, and the desulfurization catalyst is activated carbon, zinc oxide (ZnO), etc. as described in claim 1. catalytic burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59269033A JPS61147012A (en) | 1984-12-19 | 1984-12-19 | catalyst burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59269033A JPS61147012A (en) | 1984-12-19 | 1984-12-19 | catalyst burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61147012A JPS61147012A (en) | 1986-07-04 |
| JPH0335573B2 true JPH0335573B2 (en) | 1991-05-28 |
Family
ID=17466739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59269033A Granted JPS61147012A (en) | 1984-12-19 | 1984-12-19 | catalyst burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61147012A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08256809A (en) * | 1995-03-28 | 1996-10-08 | Nifco Inc | Buckle |
| KR100371208B1 (en) * | 2000-06-16 | 2003-02-06 | 한국에너지기술연구원 | premixed fiber-mat catalytic burner |
-
1984
- 1984-12-19 JP JP59269033A patent/JPS61147012A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61147012A (en) | 1986-07-04 |
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