JPH05113201A - Combustion apparatus - Google Patents
Combustion apparatusInfo
- Publication number
- JPH05113201A JPH05113201A JP3302473A JP30247391A JPH05113201A JP H05113201 A JPH05113201 A JP H05113201A JP 3302473 A JP3302473 A JP 3302473A JP 30247391 A JP30247391 A JP 30247391A JP H05113201 A JPH05113201 A JP H05113201A
- Authority
- JP
- Japan
- Prior art keywords
- selective reduction
- reduction catalyst
- gas
- nox
- adsorbent
- 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.)
- Withdrawn
Links
Landscapes
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は家庭用給湯機、ボイラ
ー、ガスタービン等の燃焼装置に関し、特に排ガス中の
窒素酸化物（以下「ＮＯｘ」という）を低減する燃焼装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustor for household water heaters, boilers, gas turbines, etc., and more particularly to a combustor for reducing nitrogen oxides (hereinafter referred to as "NOx") in exhaust gas.
【０００２】[0002]
【従来の技術】石油、ガス等の燃料を燃焼させる燃焼装
置においては、排気ガス中にＮＯｘが含まれるために、
このＮＯｘを低減するための種々の方法が講じられてい
る。例えば、(1)家庭用燃焼機においては、多段燃焼、
排ガスの再循環、バーナーの改良等のメカニカルな手段
を講じて、燃焼ガス全体もしくは局所的な高温部をなく
してＮＯｘ発生そのものを低減している。(2)自動車の
ガソリンエンジンにおいては、Ｐｔ等の貴金属を含む三
元触媒により、未燃焼ＣＯ（一酸化炭素），ＨＣ（炭化
水素）を還元剤として用いて、排気ガス中のＮＯｘを低
減している。(3)ガスタービン等の大型装置において
は、金属酸化物触媒により、アンモニアを還元剤として
用いて、排気ガス中のＮＯｘを低減している。2. Description of the Related Art In a combustion apparatus for burning fuel such as oil and gas, NOx is contained in exhaust gas,
Various methods have been taken to reduce this NOx. For example, in (1) household combustor, multi-stage combustion,
By taking mechanical measures such as recirculation of exhaust gas and improvement of burners, NOx generation itself is reduced by eliminating the entire combustion gas or local high temperature parts. (2) In a gasoline engine of an automobile, by using a three-way catalyst containing a noble metal such as Pt, unburned CO (carbon monoxide) and HC (hydrocarbon) are used as reducing agents to reduce NOx in exhaust gas. ing. (3) In a large apparatus such as a gas turbine, the metal oxide catalyst uses ammonia as a reducing agent to reduce NOx in the exhaust gas.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述し
た(1)の方法のようにメカ的に対処する場合には、燃焼
装置の性能、大きさを維持して、ＮＯｘの発生量を更に
低減することは技術的に困難である。また(2)の三元触
媒は、家庭用給湯機のように排気ガス中にＯ2が大量
（約６〜７％）に含まれる場合には用いることができな
い。更に(3)のアンモニアは、臭い、安全性、メンテナ
ンスの点で家庭用給湯機に用いるのには適しない。そこ
で本出願人はプロパン等のＨＣ（ハイドロカーボン）を
触媒を用いてＮＯｘを低減する際の還元剤として用いる
燃焼装置を提案したが、この方法が有効に働くのは一定
温度以上になっていることが条件となり、例えば家庭用
給湯機において湯を少ししか沸さないような場合にはＮ
Ｏｘを充分に除去できない。However, in the case of mechanically dealing with the above-mentioned method (1), the performance and size of the combustion device are maintained to further reduce the NOx generation amount. That is technically difficult. Further, the three-way catalyst of (2) cannot be used when a large amount of O2 (about 6 to 7%) is contained in the exhaust gas such as in a domestic hot water supply system. Furthermore, the ammonia of (3) is not suitable for use in a household water heater because of its odor, safety and maintenance. Therefore, the present applicant has proposed a combustion device that uses HC (hydrocarbon) such as propane as a reducing agent when reducing NOx using a catalyst, but this method works effectively above a certain temperature. The condition is that, for example, in the case of boiling water in a domestic hot water dispenser, N
Ox cannot be removed sufficiently.
【０００４】[0004]
【課題を解決するための手段】本発明は上記の課題を解
決するため、燃焼室の下流側にＮＯｘを吸着する吸着剤
を設け、この吸着剤の下流側に還元触媒を設け、燃料ガ
スを還元ガスとして還元触媒に導入するようにした。In order to solve the above problems, the present invention provides an adsorbent for adsorbing NOx on the downstream side of a combustion chamber, a reducing catalyst on the downstream side of the adsorbent, and a fuel gas. The reducing gas was introduced into the reducing catalyst.
【０００５】[0005]
【作用】燃焼室の温度が上昇していない時には吸着剤に
よってＮＯｘを吸着しておき、温度が上昇したならば吸
着剤からＮＯｘを放出し、放出されたＮＯｘを下流側の
選択還元触媒にて除去する。When the temperature of the combustion chamber does not rise, NOx is adsorbed by the adsorbent, and when the temperature rises, NOx is released from the adsorbent, and the released NOx is transferred to the downstream selective reduction catalyst. Remove.
【０００６】[0006]
【実施例】以下に本発明の実施例を添付図面を参照して
説明する。ここで、図１は本発明を適用した家庭用給湯
機の概略図であり、家庭用給湯機は、ケース１内に燃焼
室２を設け、燃焼室２の下部には流量制御部３を介して
供給される燃料ガスとしての都市ガスを燃焼させるバー
ナー４を配設し、また燃焼室２の上部外周には水を導く
通水管５を所要回数巻回している。さらに、通水管５の
燃焼室２上部に臨む部分には銅製のフィン等からなる熱
交換器６を設け、この熱交換器６の入口と出口との間に
例えばゼオライト系あるいはアルミナ系の選択還元触媒
７を設けている。Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a schematic view of a household water heater to which the present invention is applied. The household water heater is provided with a combustion chamber 2 in a case 1, and a flow rate control unit 3 is provided below the combustion chamber 2. A burner 4 for burning city gas as the fuel gas supplied as a fuel gas is disposed, and a water pipe 5 for guiding water is wound around the upper part of the combustion chamber 2 a required number of times. Further, a heat exchanger 6 composed of copper fins or the like is provided in a portion of the water pipe 5 which faces the upper part of the combustion chamber 2, and between the inlet and the outlet of the heat exchanger 6, for example, a zeolite-based or alumina-based selective reduction is performed. A catalyst 7 is provided.
【０００７】この選択還元触媒７は、給湯器が例えば発
熱量３００００kcal/hの１６号ガス給湯機である場合、
４００ｇのゼオライト系触媒を用いると、その比重は約
０．４、熱交換器６の断面寸法は１００mm×２００mmで
あるので、触媒の高さは５cmになる。また、選択還元触
媒７の形状は、排気抵抗が少なく、且つ触媒面積が大き
くなる形状が望ましく、例えば直径０．５mm×長さ５mm
のペレットを耐熱性の網に充填したもの等を用いること
ができる。更に、選択還元触媒７を設ける位置は、熱交
換器６の下流側に設けることもできる。This selective reduction catalyst 7 is used when the water heater is a No. 16 gas water heater with a calorific value of 30,000 kcal / h.
When 400 g of the zeolite-based catalyst is used, its specific gravity is about 0.4, and the cross-sectional dimension of the heat exchanger 6 is 100 mm × 200 mm, so the height of the catalyst is 5 cm. The shape of the selective reduction catalyst 7 is preferably such that the exhaust resistance is small and the catalyst area is large, for example, a diameter of 0.5 mm and a length of 5 mm.
It is possible to use a pellet in which a heat resistant net is filled. Further, the position where the selective reduction catalyst 7 is provided may be provided downstream of the heat exchanger 6.
【０００８】そして、流量制御部３から分岐するバイパ
ス管８を設けて、このバイパス管８の多数の噴出口８ａ
を形成した先端部を選択還元触媒７の下部内（触媒７の
直前でもよい。）に臨ませ、都市ガスの一部を還元ガス
として選択還元触媒７に導入するようにしている。この
バイパス管８を通じて導入する還元ガス量は、燃焼に用
いられるガス量に対して、都市ガス（「１３Ａ−１」）
の場合０．０２〜５％、好ましくは０．１３〜１．３％
程度、プロパンガスの場合０．００４〜５％、好ましく
は０．０２〜０．２％程度であればよい。A bypass pipe 8 branching from the flow control unit 3 is provided, and a large number of jet ports 8a of the bypass pipe 8 are provided.
The front end portion formed with is exposed to the lower part of the selective reduction catalyst 7 (may be just before the catalyst 7), and a part of the city gas is introduced into the selective reduction catalyst 7 as a reducing gas. The amount of reducing gas introduced through this bypass pipe 8 is the city gas (“13A-1”) with respect to the amount of gas used for combustion.
In the case of 0.02-5%, preferably 0.13-1.3%
And about 0.004 to 5% in the case of propane gas, preferably about 0.02 to 0.2%.
【０００９】更に、本発明にあっては選択還元触媒７の
上流側にＮＯｘを吸着するゼオライト系の吸着剤９を設
けている。この場合、選択還元触媒７としてそれ自体が
吸着機能を有するものを用いることもでき、この場合に
は吸着剤９を別途設ける必要はない。Further, in the present invention, a zeolite adsorbent 9 for adsorbing NOx is provided upstream of the selective reduction catalyst 7. In this case, as the selective reduction catalyst 7, a catalyst which itself has an adsorption function can be used, and in this case, the adsorbent 9 need not be separately provided.
【００１０】また、バイパス管８の途中に電磁弁１０を
介装し、選択還元触媒７の温度を検出する熱電対センサ
等の温度センサ１１の検知結果に基づいて制御部１２が
電磁弁１０を駆動制御するようにしている。Further, an electromagnetic valve 10 is provided in the middle of the bypass pipe 8, and the control unit 12 controls the electromagnetic valve 10 based on the detection result of a temperature sensor 11 such as a thermocouple sensor for detecting the temperature of the selective reduction catalyst 7. The drive is controlled.
【００１１】以上のように選択還元触媒７を使用して、
還元ガスとして燃料ガスである都市ガスまたはプロパン
ガスの一部をバイパスして選択還元触媒７に導入するよ
うにしたので、給湯機から発生するＮＯｘ濃度を１，０
００ppm程度より８０ppm程度に低減することができる。Using the selective reduction catalyst 7 as described above,
Since a part of city gas or propane gas, which is the fuel gas, is introduced as the reducing gas into the selective reduction catalyst 7, the NOx concentration generated from the water heater is reduced to 1,0.
It can be reduced from about 00 ppm to about 80 ppm.
【００１２】この場合、湯を少ししか沸さないようなと
きには排ガス温度が高くならず、５０℃〜２００℃の排
ガス温度では選択還元触媒７の活性が充分でないため、
ＮＯｘの除去が充分でないので、排ガス温度が低い場合
には吸着剤９にてＮＯｘを吸着保持する。このとき、制
御部１２によって電磁弁１０を閉じて選択還元触媒７へ
の還元ガス（燃料ガス）のバイパスを閉じ、都市ガスま
たはプロパンガスが排出されるのを防止する。In this case, the exhaust gas temperature does not rise when the hot water is only slightly boiled, and the selective reduction catalyst 7 is not sufficiently active at the exhaust gas temperature of 50 ° C. to 200 ° C.
Since NOx is not sufficiently removed, the adsorbent 9 adsorbs and holds NOx when the exhaust gas temperature is low. At this time, the control unit 12 closes the solenoid valve 10 to close the bypass of the reducing gas (fuel gas) to the selective reduction catalyst 7 to prevent the city gas or the propane gas from being discharged.
【００１３】そして、排ガス温度が高温になり、選択還
元触媒７の活性が充分になったときには、制御部１２に
よって電磁弁１０を開いて選択還元触媒７へ燃料ガスを
バイパスして、選択還元触媒７にて排ガス中のＮＯｘ及
び吸着剤９から放出されるＮＯｘを除去する。When the exhaust gas temperature becomes high and the activity of the selective reduction catalyst 7 becomes sufficient, the control unit 12 opens the solenoid valve 10 to bypass the fuel gas to the selective reduction catalyst 7 and At 7, NOx in the exhaust gas and NOx released from the adsorbent 9 are removed.
【００１４】尚、上記実施例では、燃料ガスの一部をバ
イパスして選択還元触媒に導入したが、例えば還元ガス
としてのプロパンガスを封入したボンベを別途設けて、
このボンベから上記バイパス管と同様な導入管を介して
選択還元触媒にプロパンガスを導入するようにすること
もできる。In the above embodiment, a part of the fuel gas was bypassed and introduced into the selective reduction catalyst. However, for example, a cylinder containing propane gas as a reducing gas is separately provided,
It is also possible to introduce propane gas from this cylinder into the selective reduction catalyst through an introduction pipe similar to the bypass pipe.
【００１５】[0015]
【発明の効果】以上に説明したように本発明によれば、
選択還元触媒を使用して燃料ガスの一部を還元ガスとし
て触媒に導入するようにしたので、燃焼装置の大型化を
避けながら騒音、安全性、性能低下の問題を生じること
なくＮＯｘを低減することができるとともに、吸着剤を
設けたので選択還元触媒の活性が不十分なときにもＮＯ
ｘを吸着して除去することができる。As described above, according to the present invention,
Since a part of the fuel gas is introduced into the catalyst as a reducing gas using a selective reduction catalyst, NOx can be reduced without causing problems of noise, safety and performance while avoiding an increase in size of the combustion device. In addition, since the adsorbent is provided, NO can be generated even when the activity of the selective reduction catalyst is insufficient.
x can be adsorbed and removed.
【図１】本発明を適用した家庭用給湯機の概略図FIG. 1 is a schematic diagram of a household water heater to which the present invention is applied.
１…ケース、２…燃焼室、３…流量制御部、６…熱交換
器、７…選択還元触媒、８…バイパス管、９…吸着剤。1 ... Case, 2 ... Combustion chamber, 3 ... Flow control part, 6 ... Heat exchanger, 7 ... Selective reduction catalyst, 8 ... Bypass pipe, 9 ... Adsorbent.
Claims (1)
て、燃焼室の下流側に窒素酸化物を吸着する吸着剤を設
け、この吸着剤の下流側に選択還元触媒を設け、この選
択還元触媒に前記燃料ガスの一部を導入するようにした
ことを特徴とする燃焼装置。1. A combustion device for burning fuel gas, wherein an adsorbent for adsorbing nitrogen oxides is provided on the downstream side of a combustion chamber, and a selective reduction catalyst is provided on the downstream side of the adsorbent, and the selective reduction catalyst is provided with A combustion device characterized by introducing a part of fuel gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3302473A JPH05113201A (en) | 1991-10-22 | 1991-10-22 | Combustion apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3302473A JPH05113201A (en) | 1991-10-22 | 1991-10-22 | Combustion apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05113201A true JPH05113201A (en) | 1993-05-07 |
Family
ID=17909375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3302473A Withdrawn JPH05113201A (en) | 1991-10-22 | 1991-10-22 | Combustion apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05113201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012052750A (en) * | 2010-09-02 | 2012-03-15 | Miura Co Ltd | Method of purifying combustion gas, and combustion device |
-
1991
- 1991-10-22 JP JP3302473A patent/JPH05113201A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012052750A (en) * | 2010-09-02 | 2012-03-15 | Miura Co Ltd | Method of purifying combustion gas, and combustion device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4413020B2 (en) | Exhaust gas purification device and control method thereof | |
| JP2722987B2 (en) | Exhaust gas purification device for internal combustion engine | |
| JP2727906B2 (en) | Exhaust gas purification device for internal combustion engine | |
| JPH0724575Y2 (en) | Exhaust gas purification device for internal combustion engine | |
| US6955042B1 (en) | CPO regenerated lean NOx trap with no moving parts | |
| WO2017177853A1 (en) | Catalysis flameless combustion device and combustion method producing extremely-low pollutant emission | |
| JP6054057B2 (en) | Exhaust gas purification filter, smoke filter regeneration system, and regeneration method thereof | |
| JP2012097735A (en) | System, method, apparatus for regenerating catalyst material | |
| KR101269383B1 (en) | Exhaust gas pyrification device | |
| JP2011033018A (en) | Method for eliminating nitrogen oxide in exhaust gas and exhaust device for performing the same | |
| JP5285296B2 (en) | Exhaust gas purification device | |
| WO2009099181A1 (en) | Exhaust gas purification device | |
| JP4767909B2 (en) | Exhaust gas purification device | |
| JP5282568B2 (en) | Exhaust gas purification method and exhaust gas purification system | |
| JP3779828B2 (en) | Exhaust gas purification device for internal combustion engine | |
| JPH05113201A (en) | Combustion apparatus | |
| JP2015151894A (en) | Exhaust gas purification device mounted with exhaust gas temperature increase device | |
| JPH05113203A (en) | Combustion apparatus | |
| JP2008114115A (en) | Harmful substance reduction system | |
| JPH05113202A (en) | Combustion apparatus | |
| JPS63242323A (en) | Method and apparatus for removing nitrogen oxide in gas | |
| JP3500686B2 (en) | Operating method of cogeneration system | |
| KR102639057B1 (en) | Harmful substance reduction system for exhaust gas capable of continuously removing harmful substances during regeneration of the catalytic converter and reducing method for harnful substance in exhaust gas using the same | |
| JP2011069270A (en) | Exhaust emission control device | |
| KR20240022240A (en) | Apparatus for absorbing flue gas of combined cycle power plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990107 |