JPH0247648B2 - NENSHOHAIGASUOMOCHIITABOIRACHUUBUNOFUSHOKUBOSHIHOHO - Google Patents
NENSHOHAIGASUOMOCHIITABOIRACHUUBUNOFUSHOKUBOSHIHOHOInfo
- Publication number
- JPH0247648B2 JPH0247648B2 JP26554884A JP26554884A JPH0247648B2 JP H0247648 B2 JPH0247648 B2 JP H0247648B2 JP 26554884 A JP26554884 A JP 26554884A JP 26554884 A JP26554884 A JP 26554884A JP H0247648 B2 JPH0247648 B2 JP H0247648B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- exhaust gas
- grate
- secondary air
- combustion 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
- 238000002485 combustion reaction Methods 0.000 claims description 49
- 238000005260 corrosion Methods 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 4
- 238000002309 gasification Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000000197 pyrolysis Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 23
- 239000000446 fuel Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/48—Preventing corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/10—Arrangement of sensing devices
- F23G2207/103—Arrangement of sensing devices for oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/10—Arrangement of sensing devices
- F23G2207/104—Arrangement of sensing devices for CO or CO2
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/30—Oxidant supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/00001—Exhaust gas recirculation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/07003—Controlling the inert gas supply
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は燃焼排ガスを用いたボイラチユーブの
腐食防止方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for preventing corrosion of boiler tubes using combustion exhaust gas.
従来例の構成とその問題点
ボイラ付の焼却炉においては、燃料中に塩化ビ
ニル等が含まれる場合、発生するHClにより、ボ
イラチユーブが腐食される傾向がある。この現象
は、燃料の熱分解速度が大きい場合、燃焼用空気
を一次空気と二次空気に分割しただけでは、炉床
上の燃料の熱分解速度が制御しきれないことに基
づく。すなわち、例えば燃料が都市ごみ等の性状
変動が大きい燃料の場合、二次空気だけでは、未
燃ガスの焼却が完全に行なわれず、ボイラチユー
ブ付近が還元性雰囲気となつて、下記に示す式に
従い、HClによる腐食反応が進行するといわれて
いる。また、実際にO2濃度が低く、CO濃度が高
い雰囲気下ではHClによる腐食が大きいことが確
認されている。Conventional configuration and its problems In an incinerator equipped with a boiler, when vinyl chloride or the like is contained in the fuel, the boiler tube tends to be corroded by the generated HCl. This phenomenon is based on the fact that when the rate of thermal decomposition of the fuel is high, the rate of thermal decomposition of the fuel on the hearth cannot be controlled simply by dividing the combustion air into primary air and secondary air. In other words, if the fuel is a fuel whose properties fluctuate greatly, such as municipal waste, the unburned gas will not be completely incinerated using secondary air alone, and the vicinity of the boiler tube will become a reducing atmosphere, and the It is said that the corrosion reaction caused by HCl progresses. Furthermore, it has been confirmed that corrosion due to HCl is actually large in an atmosphere where the O 2 concentration is low and the CO concentration is high.
Fe3O4＋6HCl＋Ｃ→3FeCl2＋3H2O＋CO
Fe3O4＋6HCl＋CO→3FeCl2＋3H2O＋CO2
このような現象を防止するには、ボイラチユー
ブの近傍において還元性雰囲気を作らないように
することが必要である。Fe 3 O 4 +6HCl+C→3FeCl 2 +3H 2 O+CO Fe 3 O 4 +6HCl+CO→3FeCl 2 +3H 2 O+CO 2To prevent this phenomenon, it is necessary to avoid creating a reducing atmosphere near the boiler tube. It is.
発明の目的
本発明は上記従来の問題を解消する燃焼排ガス
を用いたボイラチユーブの腐食防止方法を提供す
ることを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide a method for preventing corrosion of boiler tubes using combustion exhaust gas, which solves the above-mentioned conventional problems.
発明の構成
上記目的を達成するため、本発明の燃焼排ガス
を用いたボイラチユーブの腐食防止方法は、焼却
炉内の乾燥ゾーン、熱分解ガス化ゾーン、発炎燃
焼ゾーン、おき燃焼ゾーンを形成する各火格子の
下方から燃焼用一次空気を送入するとともに、前
記火格子上方の空間上流側部分に燃焼排ガスを送
入して焼却物の燃焼を行い、さらに前記火格子上
方の空間下流側部分に燃焼用二次空気を送入して
未燃ガスの燃焼を行い、このような三段送入によ
る燃焼期間中に、前記焼却炉に接続して設けられ
たボイラのチユーブ手前近傍空間における燃焼排
ガス中からCO、CO2、HC、NH3、O2等の特定
成分の濃度を連続的に分析し、この結果に基づい
て前記燃焼排ガスと燃焼用二次空気の送入量を前
記特定成分が所定濃度となるように調整し、未燃
ガスの完全燃焼を行うものであり、これにより、
ボイラチユーブ近傍が還元雰囲気になるのを防
ぎ、ボイラチユーブの腐食を有効に防ぐことがで
きるものである。Structure of the Invention In order to achieve the above object, the method for preventing corrosion of a boiler tube using combustion exhaust gas of the present invention includes forming a drying zone, a pyrolysis gasification zone, a flaming combustion zone, and a stoking combustion zone in an incinerator. Primary air for combustion is introduced from below each grate, and combustion exhaust gas is introduced into the upstream part of the space above the grate to combust the materials to be incinerated, and further, the downstream part of the space above the grate Secondary air for combustion is fed into the incinerator to combust the unburned gas, and during the combustion period by such three-stage feeding, combustion occurs in the space near the tube of the boiler connected to the incinerator. The concentration of specific components such as CO, CO 2 , HC, NH 3 , O 2 etc. in the exhaust gas is continuously analyzed, and based on the results, the amount of the combustion exhaust gas and secondary air for combustion to be fed is determined according to the specific components. is adjusted so that it reaches a predetermined concentration, and the unburned gas is completely combusted.
This prevents the vicinity of the boiler tube from becoming a reducing atmosphere and effectively prevents corrosion of the boiler tube.
実施例と作用
以下、本発明の一実施例を図面に基づいて説明
する。Embodiment and Operation An embodiment of the present invention will be described below based on the drawings.
図において、１は焼却炉、２はその乾燥火格
子、３は燃焼火格子、４は後燃焼火格子、５は各
火格子２，３，４の上で燃焼せしめられる焼却物
である。６は焼却炉１に接続して設けられたボイ
ラで、そのボイラチユーブの手前近傍空間に対応
する壁面には燃焼排ガス自動連続分析装置Ｓ，
Ｔ，Ｕ，Ｖ，Ｗ，Ｘ，Ｙが配設されている。これ
ら燃焼排ガス自動連続分析装置Ｓ〜Ｙは、燃焼排
ガス中の特定成分（例えば、CO、CO2、HC、
NH3、O2等の内の何れか一つ）の濃度が所定濃
度を越えているか以下であるかを分析するもので
ある。 In the figure, 1 is an incinerator, 2 is its drying grate, 3 is a combustion grate, 4 is a post-combustion grate, and 5 is an incineration material to be burned on each of the grate 2, 3, 4. 6 is a boiler connected to the incinerator 1, and on the wall corresponding to the space near the front of the boiler tube, an automatic continuous flue gas analyzer S,
T, U, V, W, X, and Y are arranged. These combustion exhaust gas automatic continuous analyzers S to Y analyze specific components in the combustion exhaust gas (for example, CO, CO 2 , HC,
This is to analyze whether the concentration of any one of NH 3 , O 2 , etc. exceeds a predetermined concentration or is below a predetermined concentration.
一方、７は各火格子２，３，４の下方から燃焼
用一次空気を送入する一次空気送入ライン、８は
火格子２，３，４上方の空間上流側部分に燃焼排
ガスを送入する燃焼排ガス送入ライン、９は火格
子２，３，４上方の空間下流側部分に燃焼用二次
空気を送入する二次空気送入ラインで、燃焼排ガ
ス送入ライン８の途中と二次空気送入ライン９の
途中には流量制御用ダンパ１０，１１，１２が介
装されている。そして各ダンパ１０，１１，１２
はそれぞれ制御装置１３に接続され、燃焼排ガス
自動連続分析装置Ｓ〜Ｙの分析結果に基づき後述
するように適宜開度調節される構成とされてい
る。 On the other hand, 7 is a primary air feed line that feeds primary air for combustion from below each grate 2, 3, 4, and 8 is a line that feeds combustion exhaust gas into the upstream part of the space above the grate 2, 3, 4. A combustion exhaust gas supply line 9 is a secondary air supply line that supplies combustion secondary air to the downstream part of the space above the grates 2, 3, and 4. Flow control dampers 10, 11, and 12 are interposed in the middle of the secondary air supply line 9. And each damper 10, 11, 12
are each connected to the control device 13, and are configured to appropriately adjust the opening degree as described later based on the analysis results of the combustion exhaust gas automatic continuous analyzers S to Y.
このような構成で、焼却炉１の運転を行う場
合、各火格子２，３，４の下方から一次空気送入
ライン７を通して燃焼用一次空気を送入するとと
もに、火格子２，３，４上方の空間上流側部分に
燃焼排ガス送入ライン８を通して燃焼排ガスを送
入し、さらに火格子２，３，４上方の空間下流側
部分に二次空気送入ライン９を通して燃焼用二次
空気を送入する。 When operating the incinerator 1 with such a configuration, primary air for combustion is fed from below each grate 2, 3, 4 through the primary air feed line 7, and Combustion exhaust gas is fed into the upstream side of the space above through a combustion exhaust gas feed line 8, and secondary air for combustion is fed through a secondary air feed line 9 into the downstream side of the space above the grates 2, 3, and 4. Send.
そして、このような三段送入による燃焼期間中
に、ボイラチユーブ手前近傍空間における燃焼排
ガスを燃焼排ガス自動連続分析装置Ｓ〜Ｙのサン
プリングノズルの一つあるいは全部で採取し、
CO、CO2、HC、NH3あるいはO2の濃度を自動
連続分析する。全部のサンプリングノズルで濃度
を分析した場合には平均値を出す。このときの分
析値は瞬時値であつてもよいし、ある一定時間内
の平均値であつてもよい。 Then, during the combustion period by such three-stage feeding, the combustion exhaust gas in the space near the front of the boiler tube is sampled by one or all of the sampling nozzles of the combustion exhaust gas automatic continuous analyzer S to Y,
Automatic continuous analysis of CO, CO 2 , HC, NH 3 or O 2 concentration. When the concentration is analyzed using all sampling nozzles, the average value is calculated. The analysis value at this time may be an instantaneous value or may be an average value within a certain period of time.
そこで、COの値が所定濃度（例えば100ppm）
を越えると、制御装置１３によつてダンパ１０，
１１を開き、燃焼排ガスの送入量を増加させる。
これにより、炉床上の熱分解ガス化速度が抑制さ
れることになる。また制御装置１３によつてダン
パ１２を開き、燃焼用二次空気の送入量を増加さ
せる。そうすると、未燃ガスが完全燃焼してCO
が減少し、もつて、ボイラチユーブの腐食が防止
されることになる。なお、所定濃度以下であれ
ば、所定濃度となるように燃焼排ガスおよび燃焼
用二次空気の送入量を減少させる。このような制
御はCO2、HCあるいはNH3がそれぞれ所定濃度
を越えている場合も同様に行う。 Therefore, if the CO value is set to a specified concentration (for example, 100 ppm)
When the damper 10,
11 to increase the amount of combustion exhaust gas fed.
This will suppress the pyrolysis gasification rate above the hearth. Further, the damper 12 is opened by the control device 13 to increase the amount of secondary air for combustion. Then, the unburned gas is completely combusted and CO
As a result, corrosion of the boiler tube is prevented. Note that if the concentration is below the predetermined concentration, the amount of the combustion exhaust gas and the secondary air for combustion is reduced so that the concentration becomes the predetermined concentration. Such control is performed in the same way even if CO 2 , HC or NH 3 exceeds a predetermined concentration.
一方、O2の値が所定濃度（例えば２％）以下
であると、制御装置１３によつてダンパ１０，１
１を開き、燃焼排ガスの送入量を増加させて、炉
床上の熱分解ガス化速度を抑制する。そして、制
御装置１３によつてダンパ１２を開き、燃焼用二
次空気の送入量を増加させれば、上記COの場合
と同様に完全燃焼が行われ、ボイラチユーブの腐
食が防止されることになる。なお、所定濃度を越
えていれば、燃焼排ガスおよび燃焼用二次空気の
送入量を所定濃度となるように減少させる。 On the other hand, if the O 2 value is below a predetermined concentration (for example, 2%), the control device 13 controls the dampers 10 and 1.
1 is opened, the amount of flue gas fed is increased, and the rate of pyrolysis gasification on the hearth is suppressed. Then, if the damper 12 is opened by the control device 13 and the amount of secondary air for combustion is increased, complete combustion will occur as in the case of CO, and corrosion of the boiler tube will be prevented. become. Note that, if the concentration exceeds the predetermined concentration, the amount of the combustion exhaust gas and secondary air for combustion is reduced to the predetermined concentration.
発明の効果
以上本発明によれば、ボイラチユーブ近傍が還
元雰囲気になるのを防ぎ、ボイラチユーブの腐食
を有効に防ぐことができる。Effects of the Invention As described above, according to the present invention, the vicinity of the boiler tube can be prevented from becoming a reducing atmosphere, and corrosion of the boiler tube can be effectively prevented.
図面は本発明の一実施例を説明するための焼却
炉縦断面図である。
１……焼却炉、２……乾燥火格子、３……燃焼
火格子、４……後燃焼火格子、６……ボイラ、７
……一次空気送入ライン、８……燃焼排ガス送入
ライン、９……二次空気送入ライン、１３……制
御装置、Ｓ〜Ｙ……自動連続分析装置。
The drawing is a longitudinal sectional view of an incinerator for explaining one embodiment of the present invention. 1...Incinerator, 2...Drying grate, 3...Combustion grate, 4...Post-combustion grate, 6...Boiler, 7
...Primary air feed line, 8...Combustion exhaust gas feed line, 9...Secondary air feed line, 13...Control device, S to Y...Automatic continuous analysis device.
Claims (1)
ン、発炎燃焼ゾーン、おき燃焼ゾーンを形成する
各火格子の下方から燃焼用一次空気を送入すると
ともに、前記火格子上方の空間上流側部分に燃焼
排ガスを送入して焼却物の燃焼を行い、さらに前
記火格子上方の空間下流側部分に燃焼用二次空気
を送入して未燃ガスの燃焼を行い、このような三
段送入による燃焼期間中に、前記焼却炉に接続し
て設けられたボイラのチユーブ手前近傍空間にお
ける燃焼排ガス中からCO、CO2、HC、NH3、
O2等の特定成分の濃度を連続的に分析し、この
結果に基づいて前記燃焼排ガスと燃焼用二次空気
の送入量を前記特定成分が所定濃度となるように
調整し、未燃ガスの完全燃焼を行うことを特徴と
する燃焼排ガスを用いたボイラチユーブの腐食防
止方法。1. Primary air for combustion is introduced from below each grate forming the drying zone, pyrolysis gasification zone, flaming combustion zone, and arbor combustion zone in the incinerator, and the upstream part of the space above the grate Combustion exhaust gas is fed into the grate to burn the incinerated material, and secondary air for combustion is fed into the downstream part of the space above the grate to burn unburned gas. CO, CO2 , HC, NH3 ,
The concentration of specific components such as O 2 is continuously analyzed, and based on the results, the amount of the combustion exhaust gas and secondary air for combustion is adjusted so that the specific components have a predetermined concentration, and unburned gas is A method for preventing corrosion of boiler tubes using combustion exhaust gas, characterized by complete combustion of boiler tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26554884A JPH0247648B2 (en) | 1984-12-17 | 1984-12-17 | NENSHOHAIGASUOMOCHIITABOIRACHUUBUNOFUSHOKUBOSHIHOHO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26554884A JPH0247648B2 (en) | 1984-12-17 | 1984-12-17 | NENSHOHAIGASUOMOCHIITABOIRACHUUBUNOFUSHOKUBOSHIHOHO |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61143615A JPS61143615A (en) | 1986-07-01 |
| JPH0247648B2 true JPH0247648B2 (en) | 1990-10-22 |
Family
ID=17418644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26554884A Expired - Lifetime JPH0247648B2 (en) | 1984-12-17 | 1984-12-17 | NENSHOHAIGASUOMOCHIITABOIRACHUUBUNOFUSHOKUBOSHIHOHO |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0247648B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106687744A (en) * | 2014-09-12 | 2017-05-17 | 三菱重工环境·化学工程株式会社 | Stoker-type incinerator |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK0765454T3 (en) * | 1995-10-06 | 1999-04-19 | Consorzio Nazionale Imballaggi | Removal of high temperature acid gases and particles in waste incineration processes |
| JPH09273733A (en) * | 1996-02-06 | 1997-10-21 | Nkk Corp | Combustion control method for refuse incinerator |
| JP3319327B2 (en) * | 1997-03-26 | 2002-08-26 | 日本鋼管株式会社 | Combustion control method and device for refuse incinerator |
| FR2785976B1 (en) * | 1998-11-17 | 2000-12-15 | Air Liquide | WASTE COMBUSTION PROCESS FOR REDUCING DIOXIN EMISSIONS |
| NL1015519C2 (en) * | 2000-06-14 | 2001-12-28 | Amsterdam Gem Dienst Afvalverw | Flue gas recirculation at a waste incineration plant. |
| DE10347340A1 (en) * | 2003-10-11 | 2005-05-19 | Forschungszentrum Karlsruhe Gmbh | Apparatus and method for optimizing exhaust burnout in incinerators |
| JP6030913B2 (en) * | 2012-10-11 | 2016-11-24 | 川崎重工業株式会社 | Stoker-type incinerator |
| JP5473098B1 (en) * | 2013-06-06 | 2014-04-16 | 株式会社タクマ | Stoker-type incinerator |
-
1984
- 1984-12-17 JP JP26554884A patent/JPH0247648B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106687744A (en) * | 2014-09-12 | 2017-05-17 | 三菱重工环境·化学工程株式会社 | Stoker-type incinerator |
| US10386064B2 (en) | 2014-09-12 | 2019-08-20 | Mitsubishi Heavy Industries Environmental & Chemical Engineering Co., Ltd. | Stoker-type incinerator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61143615A (en) | 1986-07-01 |
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