JPH0657299B2 - Exhaust gas denitration method for refuse incinerator - Google Patents
Exhaust gas denitration method for refuse incineratorInfo
- Publication number
- JPH0657299B2 JPH0657299B2 JP59086258A JP8625884A JPH0657299B2 JP H0657299 B2 JPH0657299 B2 JP H0657299B2 JP 59086258 A JP59086258 A JP 59086258A JP 8625884 A JP8625884 A JP 8625884A JP H0657299 B2 JPH0657299 B2 JP H0657299B2
- Authority
- JP
- Japan
- Prior art keywords
- denitration
- exhaust gas
- catalytic
- refuse incinerator
- reducing agent
- 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
Landscapes
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ この発明はごみ焼却炉の排ガス脱硝方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an exhaust gas denitration method for a refuse incinerator.
＜従来技術＞ ごみ焼却炉の排ガスは通常脱硝、除塵、HCl 除去等の処
理過程を経て無害化された上で煙突から排出される。<Prior Art> Exhaust gas from a refuse incinerator is normally detoxified through a treatment process such as denitration, dust removal, and HCl removal, and then discharged from a chimney.
このようなごみ焼却炉の排ガス処理過程での脱硝方法に
は無触媒脱硝法と触媒脱硝法とがある。前者の無触媒脱
硝法は、高温ゾーンにアンモニア等の還元剤を添加（通
常は炉出口近傍にこのような添加ゾーンを設けている）
して脱硝する方法である。後者の触媒脱硝法は触媒反応
ゾーンを設け、この反応ゾーン前にアンモニア等の還元
剤を添加して触媒上で脱硝する方法である。The denitration method in the exhaust gas treatment process of such a waste incinerator includes a non-catalytic denitration method and a catalytic denitration method. In the former non-catalytic denitration method, a reducing agent such as ammonia is added to the high temperature zone (usually such an addition zone is provided near the furnace outlet).
And denitration. The latter catalytic denitration method is a method in which a catalytic reaction zone is provided, and a reducing agent such as ammonia is added before the reaction zone to denitrate on the catalyst.
＜発明が解決しようとする問題点＞ 無触媒脱硝法は、還元剤を添加する反応空間の温度が一
定範囲内（750 〜950 ℃）にないと脱硝効果が低くなる
特性を有するが、ごみ焼却炉から排出され、炉出口にあ
る排ガスは温度変動が大きく、そのため脱硝効率の変動
も大きくなる欠点がある。また二次公害防止のため還元
剤の添加量が制限され、これらのことから脱硝効果は約
３０〜７０％程度である。<Problems to be Solved by the Invention> The non-catalytic denitration method has a characteristic that the denitration effect becomes low unless the temperature of the reaction space in which the reducing agent is added is within a certain range (750 to 950 ° C). The exhaust gas discharged from the furnace and present at the furnace outlet has a large temperature fluctuation, which causes a large fluctuation in the denitration efficiency. Further, the amount of reducing agent added is limited in order to prevent secondary pollution, and for these reasons, the denitration effect is about 30 to 70%.
一方触媒脱硝法は、触媒のコストが高く設備費、ランニ
ングコスト共に高くなる欠点がある。On the other hand, the catalytic denitration method has a drawback that the cost of the catalyst is high and the equipment cost and the running cost are high.
＜問題点を解決するための手段＞ 本発明は上記した従来のごみ焼却炉排ガス処理における
脱硝法の欠点を改善するためになされたもので、無触媒
脱硝法を高温で安定している領域の得られるごみ焼却炉
内で特に実施すると共に、これと触媒脱硝法を組合せる
ことにより高効率で低廉なごみ焼却炉排ガスの脱硝法を
提供しようとするものである。<Means for Solving Problems> The present invention has been made to improve the above-mentioned drawbacks of the denitration method in the conventional waste incinerator exhaust gas treatment. The present invention intends to provide a highly efficient and low-cost denitration method for exhaust gas of a refuse incinerator by performing the method in the obtained incinerator and combining it with a catalytic denitration method.
第１図において(1)はごみ焼却炉、(2)はガス冷却装置、
(3)は電気集塵機である。In Fig. 1, (1) is a refuse incinerator, (2) is a gas cooling device,
(3) is an electrostatic precipitator.
本発明においてはまずごみ焼却炉(1) で火炎が存在せ
ず、且つ温度変動の少ない安定高温域(750〜950℃)であ
って、しかも滞留時間の十分とれる所に還元剤供給装置
(5) によって還元剤を添加し、無触媒脱硝を行う。この
ように炉内は通常温度変動が少なく安定しているため、
白煙目視限界のNH3／NOX≒1.2〜1.3で40〜70％の脱硝効
率が得られる。In the present invention, a reducing agent supply device is first provided in the refuse incinerator (1) in a stable high temperature region (750 to 950 ° C) where flame does not exist and temperature fluctuation is small, and the residence time is sufficient.
(5) Add a reducing agent and perform non-catalytic denitration. In this way, since the temperature inside the furnace is usually small and stable,
A denitration efficiency of 40 to 70% is obtained when NH 3 / NO X ≈1.2 to 1.3, which is the limit of visual observation of white smoke.
脱硝後の排ガスを冷却装置(2)、電気集塵機(3)で処理
後、前記還元剤供給装置(5) によって再び還元剤を添加
してからこの後段に設けた触媒反応装置(4)で再び脱硝
を行う。装置(4)に入つてくる排ガス中のNOＸ濃度は無
触媒脱硝で既に低下しているため、この触媒反応装置本
体及び付属する触媒再生装置等を小さくすることができ
る。また、触媒の使用量も抑えることができる。更に無
触媒脱硝における炉温低下による脱硝効率の低下をこの
触媒脱硝で確実にカバーし、排出NOＸ濃度を安定して低
く抑えることができる。After treating the exhaust gas after denitration with the cooling device (2) and the electrostatic precipitator (3), the reducing agent is added again by the reducing agent supply device (5) and then again with the catalytic reaction device (4) provided in the latter stage. Perform denitration. Since the NO X concentration in the exhaust gas entering the device (4) has already been lowered by non-catalytic denitration, the main body of the catalytic reaction device and the attached catalyst regenerating device can be downsized. Also, the amount of catalyst used can be suppressed. Further, this catalytic denitration can reliably cover the decrease in the denitration efficiency due to the decrease of the furnace temperature in the non-catalytic denitration, and the exhaust NO X concentration can be stably suppressed to a low level.
しかも、触媒脱硝前に排ガスの集塵を直前の電気集塵機
(3) により行なっているため、ダストのないクリーンな
排ガスに対して触媒脱硝を行なうことになり、触媒反応
装置(4) の装置寿命も長くなる。Moreover, before the catalytic denitration, the dust collector of the exhaust gas is collected just before the electric dust collector.
Since it is performed by (3), catalytic denitration is performed on clean exhaust gas without dust, and the life of the catalytic reaction device (4) is extended.
第２図は触媒反応装置(4)の他の構成例を示すもので、
バイパス(40)設け、ダンパ(41)で反応装置(4)への通ガ
ス量及びアンモニア供給量を制御することにより排出NO
Ｘ濃度を一定にするように構成している。またの構成で
は全ガス量を反応装置(4)に通ガスすることがなく、触
媒の被毒を低く抑えることが可能となる。FIG. 2 shows another structural example of the catalytic reaction device (4).
By providing a bypass (40) and controlling the amount of gas passing through the damper (41) to the reactor (4) and the amount of ammonia supplied, NO emissions can be reduced.
The X concentration is configured to be constant. In addition, with this configuration, the total amount of gas is not passed through the reaction device (4), and it is possible to suppress poisoning of the catalyst to a low level.
＜発明の効果＞ 以上説明したように本発明法では、無触媒脱硝を高温で
安定している領域の得られるごみ焼却炉内で特に実施す
ると共に、これと触媒脱硝の両方を行なうことにより高
効率でしかも安定した脱硝が行え、排出NOＸ濃度を安定
して低く抑えることが可能となる。また触媒脱硝装置も
小さくて済み触媒使用量も減少するため、設備コスト、
ランニングコストの低減が図れる。更に無触媒脱硝で添
加した還元剤も触媒脱硝で有効に利用できる。加えて、
触媒脱硝前に排ガスを集塵を行なっているため、ダスト
のないクリーンな排ガスに対して触媒脱硝を行なうこと
になり、触媒反応装置の装置寿命も長くなる。<Effects of the Invention> As described above, in the method of the present invention, non-catalytic denitration is carried out particularly in a refuse incinerator where a stable region at high temperature can be obtained, and by performing both this and catalytic denitration, It is possible to perform denitration efficiently and stably, and it is possible to stably suppress the exhausted NO X concentration to a low level. In addition, the catalyst denitration equipment is small and the amount of catalyst used also decreases, so equipment cost,
The running cost can be reduced. Further, the reducing agent added without catalytic denitration can also be effectively used with catalytic denitration. in addition,
Since the exhaust gas is collected before the catalyst denitration, the catalyst denitration is performed on the clean exhaust gas without dust, and the life of the catalytic reaction device is extended.
第１図は本発明方法の説明図、第２図は触媒反応装置の
他の実施例の説明図である。 (1)……ごみ焼却炉、(2)……ガス冷却装置、(3)……電
気集塵機、(4)……触媒反応装置。FIG. 1 is an illustration of the method of the present invention, and FIG. 2 is an illustration of another embodiment of the catalytic reactor. (1) …… Gas incinerator, (2) …… Gas cooling device, (3) …… Electrostatic precipitator, (4) …… Catalytic reactor.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭53−61555（ＪＰ，Ａ) 特開 昭56−141819（ＪＰ，Ａ) 特開 昭51−105970（ＪＰ，Ａ) 特開 昭52−128873（ＪＰ，Ａ) 実公 昭56−11937（ＪＰ，Ｙ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-53-61555 (JP, A) JP-A-56-141819 (JP, A) JP-A-51-105970 (JP, A) JP-A-52- 128873 (JP, A) Actual public Sho 56-11937 (JP, Y2)
Claims (1)
にて還元剤を添加することで排ガスの無触媒脱硝を行
い、次いでこの排ガスを冷却、電気集塵した後排ガスの
全部又は一部につき、先に還元剤の添加を行った後触媒
反応装置により触媒脱硝することを特徴とするごみ焼却
炉の脱硝方法。1. Exhaust gas is subjected to non-catalytic denitration by adding a reducing agent in a stable high temperature region where the flame of a refuse incinerator does not exist, and then the exhaust gas is cooled and subjected to electrostatic precipitating, in whole or in part. Therefore, a denitrification method for a refuse incinerator, which comprises first adding a reducing agent and then performing catalytic denitration by a catalytic reaction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59086258A JPH0657299B2 (en) | 1984-05-01 | 1984-05-01 | Exhaust gas denitration method for refuse incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59086258A JPH0657299B2 (en) | 1984-05-01 | 1984-05-01 | Exhaust gas denitration method for refuse incinerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60232237A JPS60232237A (en) | 1985-11-18 |
| JPH0657299B2 true JPH0657299B2 (en) | 1994-08-03 |
Family
ID=13881791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59086258A Expired - Lifetime JPH0657299B2 (en) | 1984-05-01 | 1984-05-01 | Exhaust gas denitration method for refuse incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0657299B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117145A (en) * | 1994-10-24 | 1996-05-14 | Nobuyoshi Shima | Toilet paper holder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW386894B (en) * | 1997-06-20 | 2000-04-11 | Von Roll Umwelttechnik Ag | Process and plant for deNOxing combustion off-gas |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5361555A (en) * | 1976-11-15 | 1978-06-02 | Toho Rayon Kk | Method of removing nitrogen oxides from exhaust gas |
| JPS56141819A (en) * | 1980-04-03 | 1981-11-05 | Babcock Hitachi Kk | Treatment of waste gas |
-
1984
- 1984-05-01 JP JP59086258A patent/JPH0657299B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117145A (en) * | 1994-10-24 | 1996-05-14 | Nobuyoshi Shima | Toilet paper holder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60232237A (en) | 1985-11-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |