JPH0251657B2 - - Google Patents
Info
- Publication number
- JPH0251657B2 JPH0251657B2 JP57001732A JP173282A JPH0251657B2 JP H0251657 B2 JPH0251657 B2 JP H0251657B2 JP 57001732 A JP57001732 A JP 57001732A JP 173282 A JP173282 A JP 173282A JP H0251657 B2 JPH0251657 B2 JP H0251657B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- main pipe
- ammonia
- flue
- injection main
- 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
- 238000002347 injection Methods 0.000 claims description 37
- 239000007924 injection Substances 0.000 claims description 37
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 16
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Nozzles (AREA)
Description
【発明の詳細な説明】
本発明は排煙脱硝装置におけるNH3注入方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for injecting NH 3 into a flue gas denitrification device.
ボイラに設置される排煙脱硝装置は乾式アンモ
ニア接触還元法による脱硝装置で、比較的高温度
の排ガス中に還元剤としてアンモニアを注入し、
脱硝触媒の存在下で、窒素酸化物（NOまたは
NO2）を下記式にしたがつて窒素N2とH2Oに分
解するものである。 The flue gas denitrification equipment installed in the boiler uses the dry ammonia catalytic reduction method, which injects ammonia as a reducing agent into relatively high-temperature flue gas.
In the presence of a denitrification catalyst, nitrogen oxides (NO or
NO 2 ) is decomposed into nitrogen N 2 and H 2 O according to the following formula.
4NO＋4NH3＋O2触媒
――→
4N2＋6H2O
2NO2＋4NH3＋O2触媒
――→
3N2＋6H2O
このときのアンモニアは脱硝触媒の設置されて
いる場所より数ｍ〜10数ｍ上流側の煙道にNH3
注入母管を設置し、そのNH3注入母管に注入ノ
ズルを取付け、希釈空気で希釈したアンモニアを
注入ノズルより排ガス中に注入拡散し、排ガスに
混合させ脱硝触媒へ導き接触還元させるものであ
る。 4NO + 4NH 3 +O 2 catalyst---→ 4N 2 +6H 2 O 2NO 2 +4NH 3 +O 2 catalyst---→ 3N 2 +6H 2 O At this time, the ammonia is several meters upstream from the location where the denitrification catalyst is installed. NH3 in the flue of
An injection main pipe is installed, an injection nozzle is attached to the NH 3 injection main pipe, and ammonia diluted with diluted air is injected and diffused into the exhaust gas through the injection nozzle, mixed with the exhaust gas, and guided to the denitration catalyst for catalytic reduction. .
従来の脱硝装置用NH3注入装置では、排ガス
の流速、排ガスの流れ方向、偏流、あるいは脱硝
触媒を設置している脱硝反応器の構造等により、
排ガス中へのNH3注入分布が必らずしも均一で
なく、脱硝性能（入口NOx−出口NOx／入口NOx×100）
が、反応器出口における出口NOxのトラバース
でアンバランスを生じる結果となる。脱硝性能
（出口NOx）のアンバランスを解消するために
は、NH3注入分布を排ガスの入口NOx分布（排
ガスの流速、ガス流れ等）に対応した分布にする
必要があり、そのためにはNH3注入ノズルのオ
リフイス口径を変更（NH3注入量の増減）せざ
るを得ないのが実情である。 With conventional NH 3 injection equipment for denitrification equipment, there are
The distribution of NH 3 injection into the exhaust gas is not necessarily uniform, and the denitrification performance (inlet NOx - outlet NOx / inlet NOx x 100) results in an imbalance in the traverse of outlet NOx at the reactor outlet. . In order to eliminate the imbalance in denitrification performance (outlet NOx), it is necessary to make the NH 3 injection distribution correspond to the exhaust gas inlet NOx distribution (exhaust gas flow rate, gas flow, etc. ) . The reality is that it is necessary to change the orifice diameter of the injection nozzle (increase or decrease the amount of NH 3 injected).
第１図に従来の脱硝装置用NH3注入装置の断
面図を示す。第１図ａはガス流れ方向から見た断
面図、ｂはガス流れ方向と平行に切つた断面図で
ある。図中、１は煙道ダクト、２はアンモニア
（NH3）、空気Ａを混合するアンモニア―希釈空
気混合器であり、３はダンパー、４はアンモニア
注入母管、５はアンモニア注入ノズル、６は付着
デポジツトを取り除くためのパージ蒸気用配管で
あり、矢印は排ガスの流れを示している。 FIG. 1 shows a cross-sectional view of a conventional NH 3 injection device for a denitrification device. FIG. 1a is a sectional view taken from the gas flow direction, and FIG. 1b is a sectional view taken parallel to the gas flow direction. In the figure, 1 is a flue duct, 2 is an ammonia-dilution air mixer that mixes ammonia (NH 3 ) and air A, 3 is a damper, 4 is an ammonia injection main pipe, 5 is an ammonia injection nozzle, and 6 is an ammonia injection nozzle. This is a purge steam pipe for removing deposits, and the arrows indicate the flow of exhaust gas.
この図から判るように、NH3注入母管は煙道
１内に設置されており、NH3注入ノズル５オリ
フイスを取り替える為にはNH3注入母管を引抜
くか、ボイラ停缶を行い、煙道内に入つてNH3
注入ノズルオリフイスを取替えねばならない。そ
して一回の取替えでまだアンバランスがあると数
回、ノズルオリフイス口径を変更しなければなら
ない。 As can be seen from this figure, the NH 3 injection main pipe is installed in the flue 1, and in order to replace the NH 3 injection nozzle 5 orifice, the NH 3 injection main pipe must be pulled out or the boiler must be stopped. Enter the flue and NH 3
The injection nozzle orifice must be replaced. If there is still an imbalance after one replacement, the nozzle orifice diameter must be changed several times.
本発明は脱硝性能（出口NOx）の均一化を左
右するNH3注入装置において、上記のノズルオ
リフイス口径の変更によらずに脱硝性能の均一化
を計ることを目的としたもので、煙道内にガスの
流れと直交して10〜10数本設けるNH3注入母管
を２以上に区切り、各分割部へのNH3注入量を、
煙道外のNH3注入本管に取付けているダンパー
により垂直方向において自由に増減できるように
したことを特徴とするものである。 The present invention aims to equalize the denitrification performance without changing the nozzle orifice diameter described above in an NH 3 injection device that affects the uniformity of the denitrification performance (outlet NOx). The NH 3 injection main pipe, which is installed perpendicularly to the gas flow, is divided into two or more parts, and the amount of NH 3 injected into each divided part is determined by
It is characterized by a damper attached to the NH 3 injection main pipe outside the flue, which allows it to be freely increased or decreased in the vertical direction.
本発明の垂直方向におけるNH3注入量の増減
の仕方には(1)第２図に示すようにNH3注入母管
を２以上に仕切り、各分割部にNH3注入配管を
各々連結し、煙道外のNH3注入母管に設けられ
ているダンパーの開閉角度の調整により、各分割
部へのNH3注入量を増減するものと、(2)第３図
に示すように煙道ダクト内に排ガス流れ方向に
NH3注入母管を２系列以上設置し、１系列目は
上の一部側のみ、２系列目は次の一部のみという
ように、各系列毎に垂直方向に一部づつのみノズ
ルオリフイスを取り付け、各ダンパーの開閉角度
の調整により各部のNH3注入量を調節するもの
等が挙げられる。 The method of increasing/decreasing the amount of NH 3 injection in the vertical direction according to the present invention is as follows: (1) As shown in Fig. 2, the NH 3 injection main pipe is divided into two or more parts, and the NH 3 injection pipe is connected to each divided part. The amount of NH 3 injected into each division can be increased or decreased by adjusting the opening/closing angle of the damper installed in the NH 3 injection main pipe outside the flue. in the direction of exhaust gas flow
Install two or more series of NH 3 injection main pipes, and install the nozzle orifice only in one part in the vertical direction for each series, such as the first series only on the upper part, and the second series only on the next part. For example, the amount of NH 3 injected into each part can be adjusted by adjusting the opening/closing angle of each damper.
上記２方法について、第２図、第３図を用いて
更に具体的に説明する。 The above two methods will be explained in more detail using FIGS. 2 and 3.
(1) 第２図に示すもの
煙道ダクト１内に、NH3注入母管４を設置し、
仕切盲板９にて、上部Ａ、中央部Ｂ、下部Ｃに
NH3注入母管４を仕切り、NH3注入配管７，８
により上部Ａ、、中央部Ｂ、下部ＣへとNH3−希
釈空気混合ガスを注入する。よつて煙道ダクト１
外部に設置しているダンパー３の開閉角度を調整
する事により、NH3注入量を増減し、上部Ａ、
中央部Ｂ、下部Ｃのノズルオリフイス５より、排
ガス中に注入、拡散するNH3量をコントロール
する。(1) What is shown in Figure 2: Install the NH 3 injection main pipe 4 in the flue duct 1,
At the partition blind plate 9, the upper part A, the center part B, and the lower part C.
Partition the NH 3 injection main pipe 4 and connect the NH 3 injection pipes 7 and 8
NH 3 -diluted air mixture gas is injected into the upper part A, the middle part B, and the lower part C. Yotsute flue duct 1
By adjusting the opening/closing angle of the damper 3 installed externally, the amount of NH 3 injected can be increased or decreased.
The amount of NH 3 injected and diffused into the exhaust gas is controlled from the nozzle orifices 5 in the center part B and lower part C.
(2) 第３図に示すもの
煙道ダクト１内に、排ガス流れ方向にNH3注
入母管４をＡ，Ｂ，Ｃと３系列設置し、１系列目
Ａは上部側のみ、２系列目Ｂは中央部、３系列目
Ｃは下部側にノズルオリフイス５を取付け、煙道
ダクト１外部に設置しているダンパー３の開閉角
度を調整する事により、各部へのNH3注入量を
増減し、上部Ａ、中央部Ｂ下部Ｃのノズルオリフ
イス５より、排ガス中に注入、拡散するNH3量
をコントロールする。(2) What is shown in Fig. 3 In the flue duct 1, three series of NH 3 injection main tubes 4 are installed as A, B, and C in the exhaust gas flow direction.The first series A is only on the upper side, and the second series is The nozzle orifice 5 is attached to the center part of B, and the lower part of the third series C, and the amount of NH 3 injected to each part can be increased or decreased by adjusting the opening/closing angle of the damper 3 installed outside the flue duct 1. , the amount of NH 3 injected and diffused into the exhaust gas from the nozzle orifices 5 in the upper part A, the center part B, and the lower part C is controlled.
第１図ａ，ｂは従来のアンモニア注入配管装置
の断面図であり、第２図、第３図は本発明のアン
モニア注入システムの機構を示す断面図である。
図中、１は煙道ダクト、２はNH3−希釈空気混
合器、３はダンパー、４はNH3注入母管、５は
ノズルオリフイス、６はパージ蒸気用配管、７，
８はNH3注入配管、９は仕切盲板である。
FIGS. 1a and 1b are sectional views of a conventional ammonia injection piping device, and FIGS. 2 and 3 are sectional views showing the mechanism of the ammonia injection system of the present invention.
In the figure, 1 is a flue duct, 2 is an NH 3 -dilution air mixer, 3 is a damper, 4 is an NH 3 injection main pipe, 5 is a nozzle orifice, 6 is a purge steam pipe, 7,
8 is an NH 3 injection pipe, and 9 is a partition blind plate.
Claims (1)
において、煙道内にガスの流れに直交して設けた
アンモニア注入母管を２以上に区切り、各分割部
に開閉調整を行うダンパーを備えたアンモニア注
入配管を各々連結し、該アンモニア注入母管から
のアンモニア注入量を注入母管の長さ方向におい
て調節できるようにしたことを特徴とする排煙脱
硝におけるアンモニア注入方法。1 In the flue gas denitrification method using the dry ammonia catalytic reduction method, an ammonia injection main pipe installed perpendicular to the gas flow in the flue is divided into two or more parts, and each divided part is equipped with a damper to adjust opening and closing. An ammonia injection method for flue gas denitrification, characterized in that the ammonia injection amount from the ammonia injection main pipe can be adjusted in the length direction of the injection main pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001732A JPS58119326A (en) | 1982-01-11 | 1982-01-11 | Ammonia injection in denitrification of flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001732A JPS58119326A (en) | 1982-01-11 | 1982-01-11 | Ammonia injection in denitrification of flue gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58119326A JPS58119326A (en) | 1983-07-15 |
| JPH0251657B2 true JPH0251657B2 (en) | 1990-11-08 |
Family
ID=11509727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57001732A Granted JPS58119326A (en) | 1982-01-11 | 1982-01-11 | Ammonia injection in denitrification of flue gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58119326A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3736306C1 (en) * | 1987-10-27 | 1988-09-29 | Didier Eng | Flue gas duct for the treatment of a flue gas |
| JPH1057764A (en) * | 1996-08-19 | 1998-03-03 | Hitachi Zosen Corp | Ammonia diffusion accelerating device in waste gas denitrification system |
| JP4069196B2 (en) * | 1998-06-09 | 2008-04-02 | バブコック日立株式会社 | Exhaust gas denitration equipment |
| JP7211834B2 (en) * | 2019-02-01 | 2023-01-24 | 三菱重工業株式会社 | REDUCING AGENT SUPPLY DEVICE AND METHOD OF OPERATION OF REDUCING AGENT SUPPLY DEVICE |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635234U (en) * | 1979-08-28 | 1981-04-06 |
-
1982
- 1982-01-11 JP JP57001732A patent/JPS58119326A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635234U (en) * | 1979-08-28 | 1981-04-06 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58119326A (en) | 1983-07-15 |
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