JPH0549807B2 - - Google Patents
Info
- Publication number
- JPH0549807B2 JPH0549807B2 JP63197723A JP19772388A JPH0549807B2 JP H0549807 B2 JPH0549807 B2 JP H0549807B2 JP 63197723 A JP63197723 A JP 63197723A JP 19772388 A JP19772388 A JP 19772388A JP H0549807 B2 JPH0549807 B2 JP H0549807B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- combustion
- diesel
- burner
- diesel exhaust
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Description
【発明の詳細な説明】
本発明は定置型デイーゼル機関から排出される
高濃度のNOx及びすすの効果的かつ経済的な浄
化方法及びその際のデイーゼル排ガスの吹き込み
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an effective and economical method for purifying high concentrations of NOx and soot discharged from a stationary diesel engine, and a method for blowing diesel exhaust gas therein.
定置型デイーゼル機関から排出されるNOxは
大略800〜1300ppmであり、ボイラ等のばい煙発
生施設に比較し同一燃料使用量当りの窒素酸化物
の排出量が非常に多い。従来、デイーゼル排ガス
は、大気汚染防止法の規制対象外であつたため未
処理のまま大気へ放出されていたが、今般規制対
象となり、大気保全の必要性から大気へ放出され
る前に浄化しなければならない。すでに、デイー
ゼル機関内でのNOx抑制法は検討されているが、
デイーゼル排ガスの後処理については未だあまり
検討されていない。ボイラ等のばい煙発生施設の
脱硝法は確立されているので、その脱硝設備を使
用することも可能であるが、デイーゼル排ガス中
にはNOxの他にすすも混在しているため従来の
脱硝設備が必ずしもそのまま適用できるとは考え
難い。 The NOx emitted from stationary diesel engines is approximately 800 to 1,300 ppm, and the amount of nitrogen oxides emitted per unit of fuel used is much higher than that from soot-producing facilities such as boilers. In the past, diesel exhaust gas was released into the atmosphere untreated because it was not regulated by the Air Pollution Control Act, but now it is now subject to regulations and must be purified before being released into the atmosphere due to the need for air conservation. Must be. NOx suppression methods within diesel engines are already being considered, but
After-treatment of diesel exhaust gas has not yet been studied much. Denitrification methods for soot and smoke generating facilities such as boilers have been established, so it is possible to use such denitrification equipment, but since diesel exhaust gas contains soot in addition to NOx, conventional denitrification equipment is not suitable. It is difficult to imagine that it can necessarily be applied as is.
本方法は、ボイラ等の燃焼装置がデイーゼル機
関の近くに設置されていること、あるいは設置可
能なことを前提としている。デイーゼル排ガス中
には、多量の残存酸素（約13％）が含まれてお
り、このデイーゼル排ガスをボイラ等の燃焼装置
の燃焼用空気の一部として使用し、炭化水素燃料
を燃焼させると同時にデイーゼル排ガス中の高濃
度NOx及びすすを低減させるものである。 This method assumes that a combustion device such as a boiler is installed or can be installed near the diesel engine. Diesel exhaust gas contains a large amount of residual oxygen (approximately 13%), and this diesel exhaust gas is used as part of the combustion air for combustion equipment such as boilers to burn hydrocarbon fuel and at the same time generate diesel fuel. This reduces the high concentration of NOx and soot in exhaust gas.
本発明のもとになる概念図を第１図に示す。 A conceptual diagram on which the present invention is based is shown in FIG.
第１図はデイーゼル排ガスとボイラ等の燃焼器
とを組み合わせたプラントを示したもので、１は
デイーゼル機関、２はデイーゼル排ガスのダクト
ライン、３はボイラである。４バーナ風箱、５は
バーナである。デイーゼル機関１より排出された
排ガスは、排ガスのダクトライン２を通つてボイ
ラ３のバーナ５に導入され、燃料の二次燃焼用空
気中に導入され燃料の燃焼用空気として使用され
る。この場合デイーゼル排ガスは燃料を還元雰囲
気下で燃焼させる必要があり、燃焼反応帯より前
流側に導入する必要がある。すなわち、デイーゼ
ル排ガス中のNOxの燃料（炭化水素）による還
元を燃焼反応帯及びそれより後流側にて行なわせ
る。デイーゼル排ガス温度はボイラ導入部入口で
180℃以上であればそのまま使用して差し支えな
い。なお、排ガスの導入方法は、バーナの二次燃
焼用空気に導入することが好ましいが、それが不
可能な場合はバーナ軸に並行して燃焼反応帯に吹
き込んでもよい。デイーゼル排ガス吹き込みによ
るバーナ火炎の安定性はデイーゼル排ガスのみを
燃焼用空気としているのではなく空気も併用して
いるため火炎の安定性は良い。 Figure 1 shows a plant that combines diesel exhaust gas and a combustor such as a boiler, where 1 is a diesel engine, 2 is a duct line for diesel exhaust gas, and 3 is a boiler. 4 burner style box, 5 is burner. Exhaust gas discharged from the diesel engine 1 is introduced into the burner 5 of the boiler 3 through the exhaust gas duct line 2, and is introduced into the air for secondary combustion of fuel and used as air for combustion of the fuel. In this case, the diesel exhaust gas must be introduced upstream of the combustion reaction zone because it is necessary to combust the fuel in a reducing atmosphere. That is, NOx in diesel exhaust gas is reduced by fuel (hydrocarbon) in the combustion reaction zone and on the downstream side thereof. Diesel exhaust gas temperature is measured at the boiler inlet.
If the temperature is 180℃ or higher, it can be used as is. Note that it is preferable to introduce the exhaust gas into the secondary combustion air of the burner, but if this is not possible, the exhaust gas may be blown into the combustion reaction zone in parallel with the burner shaft. The stability of the burner flame due to diesel exhaust gas injection is good because the combustion air is not only diesel exhaust gas, but air is also used.
燃焼反応帯における空気比は、第２図に示すご
とく還元雰囲気におき燃料を不完全燃焼させる状
態にしておく必要があり、本領域における未燃分
あるいは未反応ガスは二段燃焼用の空気を付加す
ることにより完全燃焼させる。 As shown in Figure 2, the air ratio in the combustion reaction zone must be such that the fuel is incompletely combusted in a reducing atmosphere. Complete combustion is achieved by adding
また、デイーゼル排ガス中のすすは燃料を燃焼
する際に発生するすすとともに二段燃焼により空
気比1.1より大、温度900℃以上にて再燃焼すれば
ほとんど除去することが可能である。 In addition, most of the soot in diesel exhaust gas can be removed along with the soot generated when burning fuel by re-combustion at an air ratio of greater than 1.1 and a temperature of 900°C or higher through two-stage combustion.
第２図は１本のバーナを有する試験炉によりデ
イーゼル排ガスの浄化についてデイーゼル排ガス
を燃焼用二次空気に混入して実験した結果の一例
である。デイーゼル排ガス中のNOxの初期濃度
は1520ppmである。空気比は燃焼に使用ｓれた実
際の空気量と理論空気量の比であり、Ｗを質量濃
度、添え字Ｆを燃料、Ｏを酸化剤、expを設定条
件、stoichを化学量論条件とするとき、
１／λ＝（WF／W0）exo／（WF／W0）stoich
で定義される。 FIG. 2 shows an example of the results of an experiment for purifying diesel exhaust gas by mixing diesel exhaust gas into secondary air for combustion using a test furnace having one burner. The initial concentration of NOx in diesel exhaust gas is 1520ppm. The air ratio is the ratio between the actual amount of air used for combustion and the theoretical amount of air, where W is the mass concentration, the subscript F is the fuel, O is the oxidizer, exp is the setting condition, and stoich is the stoichiometric condition. Then, it is defined as 1/λ=(W F /W 0 )exo/(W F /W 0 )stoich.
ここで一次空気比とはバーナ単独燃焼の際の空
気比を意味し、全空気比とは一次空気比と二段燃
焼用空気などを加味したtotalの空気比を表わす。
本実験の場合には一次空気比が0.84の時最小
NOx濃度となり、全空気比1.1より大で1.3以下に
おいてNOxは160〜180ppmとなり、NOx除去率
は88〜89％と非常によく抑制できる。 Here, the primary air ratio means the air ratio during burner combustion alone, and the total air ratio represents the total air ratio that takes into account the primary air ratio and the air for second-stage combustion.
In this experiment, the minimum is when the primary air ratio is 0.84.
The NOx concentration is 160 to 180 ppm when the total air ratio is greater than 1.1 and less than 1.3, and the NOx removal rate can be suppressed very well at 88 to 89%.
第３図は火炎帯の中にデイーゼル排ガスを吹き
込んだ場合の実験の結果の一例である。この場合
は空気比の低い場合の方がNOx抑制率は高いが、
この吹き込み方法の相違はあつても一次空気比が
還元雰囲下にあるときはデイーゼル排ガス中の
NOxは非常によ還元でき、特にバーナの二次燃
焼用空気とともにデイーゼル排ガスを吹き込んだ
時の方がNOx抑制率は高い結果が得られる。 Figure 3 shows an example of the results of an experiment in which diesel exhaust gas was blown into the flame zone. In this case, the NOx suppression rate is higher when the air ratio is lower, but
Although there are differences in this blowing method, when the primary air ratio is in a reducing atmosphere,
NOx can be reduced very well, and especially when diesel exhaust gas is blown in with the burner's secondary combustion air, a higher NOx suppression rate can be obtained.
以上のことは、NOxの抑制の原理からすれば
炭化水素によるNOxの抑制技術、排ガス再循環
によるNOx抑制技術、二段燃焼によるNOx抑制
技術と多岐にわたるNOx抑制技術を駆使したデ
イーゼル排ガス抑制法である。 Based on the principle of NOx suppression, the above is a diesel exhaust gas suppression method that makes full use of a wide variety of NOx suppression technologies, including NOx suppression technology using hydrocarbons, NOx suppression technology using exhaust gas recirculation, and NOx suppression technology using two-stage combustion. be.
この様に、デイーゼル排ガスをボイラ等の燃焼
装置の燃焼用空気の一部として炭化水素燃料を燃
焼させると高濃度のNOx及びすすを効果的に抑
制でき、且つ他の脱硝設備等を付加することもな
いので経済的な方法である。 In this way, if hydrocarbon fuel is burned using diesel exhaust gas as part of the combustion air of a combustion device such as a boiler, high concentrations of NOx and soot can be effectively suppressed, and it is also possible to add other denitrification equipment. This is an economical method since there are no
第１図は本発明のもとになる概念を示す構成図
であり、定置型デイーゼル機関排ガスをボイラ内
に導入し燃焼させるプラントを示す。第２図及び
第３図は当該吹き込み方法によりデイーゼル排ガ
スを浄化した場合の実施例のグラフである。
１……デイーゼル機関、２……デイーゼル排ガ
スのダクトライン、３……ボイラ、４……バーナ
風箱、５……バーナ。
FIG. 1 is a block diagram showing the concept underlying the present invention, and shows a plant in which stationary diesel engine exhaust gas is introduced into a boiler and combusted. FIGS. 2 and 3 are graphs of examples in which diesel exhaust gas is purified by the blowing method. 1... Diesel engine, 2... Diesel exhaust gas duct line, 3... Boiler, 4... Burner wind box, 5... Burner.
Claims (1)
燃焼用空気中に吹き込んで導入し、全空気比が
1.1より大きく1.3以下の燃焼用空気として使用し
炭化水素燃料を燃焼することによりデイーゼル排
ガス中のNOx及びすすを低減することを特徴と
する定置型デイーゼル機関からの排ガスの浄化方
法。 ２ デイーゼル排ガスをボイラ等のバーナのバー
ナ軸に並行して燃焼反応帯に吹き込んで、全空気
比が1.1より大きく1.3以下となるようにして炭化
水素燃料を燃焼することによりデイーゼル排ガス
中のNOx及びすすを低減することを特徴とする
定置型デイーゼル機関からの排ガスの浄化方法。[Claims] 1. Diesel exhaust gas is blown into the secondary combustion air of a burner such as a boiler, and the total air ratio is
1. A method for purifying exhaust gas from a stationary diesel engine, characterized by reducing NOx and soot in diesel exhaust gas by using it as combustion air of greater than 1.1 and less than 1.3 and burning hydrocarbon fuel. 2 Diesel exhaust gas is injected into the combustion reaction zone in parallel with the burner shaft of a burner such as a boiler, and hydrocarbon fuel is combusted with a total air ratio greater than 1.1 and less than 1.3, thereby reducing NOx and A method for purifying exhaust gas from a stationary diesel engine, characterized by reducing soot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63197723A JPH0249915A (en) | 1988-08-08 | 1988-08-08 | Method for purifying exhaust gas from stationary diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63197723A JPH0249915A (en) | 1988-08-08 | 1988-08-08 | Method for purifying exhaust gas from stationary diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0249915A JPH0249915A (en) | 1990-02-20 |
| JPH0549807B2 true JPH0549807B2 (en) | 1993-07-27 |
Family
ID=16379278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63197723A Granted JPH0249915A (en) | 1988-08-08 | 1988-08-08 | Method for purifying exhaust gas from stationary diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249915A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2315099A1 (en) * | 1975-06-20 | 1977-01-14 | Cgr Mev | CONTROL DEVICE FOR IRRADIATION DOSE MEASURING SYSTEMS AND RADIOTHERAPY DEVICES USING SUCH A DEVICE |
-
1988
- 1988-08-08 JP JP63197723A patent/JPH0249915A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0249915A (en) | 1990-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5224334A (en) | Low NOx cogeneration process and system | |
| US5022226A (en) | Low NOx cogeneration process and system | |
| JPS5623615A (en) | Burning method for low nox | |
| JPH06508409A (en) | internal combustion engine operation | |
| JPH03503735A (en) | Two-stage boiler injection method and device for the purpose of reducing nitrogen oxides | |
| JPH0549807B2 (en) | ||
| Straitz III et al. | Combat NOx with better burner design | |
| US20060246385A1 (en) | NOx emissions reduction process and apparatus | |
| EP0317110A2 (en) | Low NOx cogeneration process | |
| US6602067B1 (en) | Method for improving fuel efficiency in combustion chambers | |
| RU2037099C1 (en) | Method of fuel burning | |
| JP3489966B2 (en) | Incinerator | |
| JP2634279B2 (en) | Method for burning NOx-containing gas | |
| JPH0130044B2 (en) | ||
| JPS5819928B2 (en) | Nitrogen oxide reduction combustion method | |
| JPS5450471A (en) | Treating method for nitrogen oxides contained in exhaust gas | |
| JP2781684B2 (en) | Two-stage combustion method | |
| JPH0367728B2 (en) | ||
| JPS61223411A (en) | Pulverized coal catalytic combustion method | |
| JPS5836620B2 (en) | Method for reducing nitrogen oxides in combustion exhaust gas | |
| JPS5813906A (en) | Low nitrogen oxide combustion method | |
| JPH0250017A (en) | Exhaust gas application burner | |
| JP2759850B2 (en) | Method for reducing nitrogen oxides in exhaust gas | |
| JPH0240921B2 (en) | ||
| Li | Emissions performance study of oxygen-enriched combustion on spark-ignition engine at cold-start |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |