JPH035616A - Simultaneous decrease of nitrogen oxides, sulfur oxides and hydrogen chloride in waste combustion gas - Google Patents
Simultaneous decrease of nitrogen oxides, sulfur oxides and hydrogen chloride in waste combustion gasInfo
- Publication number
- JPH035616A JPH035616A JP1140819A JP14081989A JPH035616A JP H035616 A JPH035616 A JP H035616A JP 1140819 A JP1140819 A JP 1140819A JP 14081989 A JP14081989 A JP 14081989A JP H035616 A JPH035616 A JP H035616A
- Authority
- JP
- Japan
- Prior art keywords
- alkaline agent
- combustion
- hydrogen chloride
- exhaust gas
- combustion gas
- 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.)
- Granted
Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052815 sulfur oxide Inorganic materials 0.000 title claims abstract description 26
- 239000000567 combustion gas Substances 0.000 title claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 13
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 title claims abstract description 12
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 title claims description 11
- 229910000041 hydrogen chloride Inorganic materials 0.000 title claims description 11
- 239000002699 waste material Substances 0.000 title abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 66
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 claims abstract description 31
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 23
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract 2
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000011575 calcium Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 239000007795 chemical reaction product Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 235000010216 calcium carbonate Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- -1 HcQ Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- YBVAXJOZZAJCLA-UHFFFAOYSA-N nitric acid nitrous acid Chemical compound ON=O.O[N+]([O-])=O YBVAXJOZZAJCLA-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chimneys And Flues (AREA)
- Incineration Of Waste (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は燃焼によって発生する窒素酸化物、硫黄酸化物
及び塩化水素の低減方法の改良に関するものであり、主
としてボイラや塵芥焼却炉、産業廃棄物焼却炉、汚泥焼
却炉等の燃焼設備に於いて利用され、湿式法ではなくし
て乾式法により、上記窒素酸化物、硫黄酸化物及び塩化
水素を同時に低減、除去するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to improvements in methods for reducing nitrogen oxides, sulfur oxides, and hydrogen chloride generated by combustion, and is mainly applied to boilers, garbage incinerators, and industrial waste. It is used in combustion equipment such as material incinerators and sludge incinerators, and uses a dry method instead of a wet method to simultaneously reduce and remove the nitrogen oxides, sulfur oxides, and hydrogen chloride.
（従来の技術）
所謂乾式法により、燃焼排ガス中から燃焼の際に発生す
る窒素酸化物（ＮＯｘ）、硫黄酸化物（ＳＯｘ）、塩化
水素（ＨＣｌ２）の王者を同時に除去する方法として下
記の（Ａ）の如き方法が、また、主としてＳＯｘとＨＣ
Ｑの王者を同時に除去する方法として下記の（Ｂ）の如
き方法が、これ迄に夫々実用に供されている。(Prior art) As a method for simultaneously removing the kings of nitrogen oxides (NOx), sulfur oxides (SOx), and hydrogen chloride (HCl2) generated during combustion from combustion exhaust gas by a so-called dry method, the following ( Methods such as A) also mainly reduce SOx and HC.
As a method for simultaneously removing the king of Q, methods such as the following (B) have been put into practical use so far.
Ωす方塾
■ 温度が約３５０℃以下の燃焼排ガス内へ粉体状又は
スラリー状の消石灰（Ｃａ （ＯＨ）ｚ）（若しくは水
酸化ナトリウム（ＮａＯＨ）、炭酸カルシウム（Ｃａ
ＣＯ３）等を噴霧し、■ 排ガス内のＳＯｘやＨＣＱ、
Ｎｏ２と反応させて硫酸カルシウムや亜硫酸カルシウム
、塩化カルシウム、硝酸塩（亜硝酸塩）等を生成させ
■ 前記反応生成物をバグフィルタ−や電気集塵機で捕
集する。Ω Shoujuku ■ Powdered or slurry slaked lime (Ca (OH)) (or sodium hydroxide (NaOH), calcium carbonate (Ca
CO3), etc., and ■ SOx and HCQ in the exhaust gas,
React with No. 2 to produce calcium sulfate, calcium sulfite, calcium chloride, nitrate (nitrite), etc. (2) Collect the reaction products using a bag filter or an electrostatic precipitator.
０１九流
■ 温度が約８００℃〜９５０℃の燃焼室内の燃焼ガス
内へ炭酸カルシウム（Ｃａ ＣＯｓ ）やドロマイト（
ＭｇＣＯ３・ＣａＣ０３）の薬剤を噴霧し、
■ 排ガス中のＳＯｘやＨＣＱと反応せしめてカルシウ
ム塩を生成させ、
■ 反応生成物であるカルシウム塩を集塵装置等で捕集
する。019 ■ Calcium carbonate (Ca COs ) and dolomite (
A chemical agent (MgCO3/CaC03) is sprayed, (1) it reacts with SOx and HCQ in the exhaust gas to produce calcium salt, and (2) the reaction product calcium salt is collected by a dust collector or the like.
而して、前記従前の（Ａ）方法は、ＳＯｘとＨ（１につ
いては比較的高い除去率（約７０〜８０％）を容易に得
ることが出来、優れた実用的効用を奏するものである。Therefore, the conventional method (A) can easily obtain a relatively high removal rate (approximately 70 to 80%) for SOx and H (1), and has excellent practical utility. .
しかし、Ｎ Ｏｘに関してはその除去率が極めて低く（
約２〜５％）、実用的な除去効果が得られないという問
題がある。However, the removal rate for NOx is extremely low (
(approximately 2 to 5%), there is a problem that a practical removal effect cannot be obtained.
尚、ＮＯｘに対する除去率が極めて低いのは、噴霧され
たＣ ａ （ＯＨ）ｚやＮａＯＨ，ＣａＣＯ３等のアル
カリ剤がＮＯ２とだけしか反応せず、ＮＯｘ内の大部分
（約９５％）を占めるＮｏがそのまま除去されずに排出
されるからである。The removal rate for NOx is extremely low because the sprayed alkali agents such as Ca(OH)z, NaOH, and CaCO3 react only with NO2, which accounts for most of the NOx (approximately 95%). This is because No. is discharged without being removed as it is.
又、前記従前の（Ｂ）方法にあっても同様であり、ＮＯ
ｘに関しては殆んど除去効果が無いという欠点がある。Also, the same applies to the previous method (B), and NO
Regarding x, there is a drawback that there is almost no removal effect.
一方、ＮＯを何等かの方法により酸化してＮＯ□にする
ことが出来れば、前述の通りＮＯ□がアルカリ剤と反応
して硝酸塩（亜硝酸塩）となるため、アルカリ剤を用い
た乾式法により、ＳＯｘとＨｃＱとＮＯｘの王者を同時
に高い除去率で除くことが可能となる。On the other hand, if NO can be oxidized to NO□ by some method, NO□ reacts with an alkaline agent to become nitrate (nitrite) as mentioned above, so a dry method using an alkaline agent can be used. , it becomes possible to simultaneously remove the champions of SOx, HcQ, and NOx with a high removal rate.
そのため、現在各種のＮｏの酸化方法、例えばコロナ放
電法やプラズマ放電法、電子線照射法、オゾン（０３）
注入法等の開発が進められているが。Therefore, there are currently various methods of oxidizing No, such as corona discharge method, plasma discharge method, electron beam irradiation method, ozone (03)
Development of injection methods, etc. is progressing.
何れも設備費が高価になるうえ、酸化に要するエネルギ
ー費も高価となり、設備費並びに運転費の両面から実用
化が困難な状態にある。In both cases, equipment costs are high, and the energy required for oxidation is also expensive, making it difficult to put them into practical use from both equipment and operating costs.
その結果、現時点に於いては、ＮＯｘ−８Ｏｘ・ＨＣＱ
の三成分同時除去は実用化が図られておらず、ＨＣＱと
ＳＯｘをアルカリ剤の注入による乾式法により除去する
と共に、ＮＯｘの方は無触媒還元法や選択式触媒還元法
により除去するという二種の除去方法を併用する方式が
、広く実用化されている。As a result, at present, NOx-8Ox・HCQ
Simultaneous removal of these three components has not been put into practical use, and there are two methods: HCQ and SOx are removed by a dry method by injecting an alkaline agent, and NOx is removed by a non-catalytic reduction method or a selective catalytic reduction method. A method that uses seed removal methods in combination is widely put into practical use.
（発明が解決しようとする課題）
しかし、燃焼排ガス中の有害物の除去に二種の除去方法
を併用するシステムは、設備費や運転費が高騰するだけ
でなく、設備の保守管理にも多くの手数を要するという
問題がある。(Problem to be solved by the invention) However, a system that uses two types of removal methods in combination to remove harmful substances from combustion exhaust gas not only increases equipment and operating costs, but also requires much maintenance and management of the equipment. There is a problem in that it requires a lot of effort.
本発明は、従前の燃焼排ガス内の有害物質の除去処理に
於ける上述の如き問題を解決せんとするものであり、特
別なＮＯの酸化設備を併用することなく、アルカリ剤を
用いた乾式法によってＳＯｘとＨＣＱとＮＯｘの三成分
を同時に、しかも何れの成分に対しても高除去率で除く
ことが出来るようにした有害物除去方法を提供するもの
である。The present invention aims to solve the above-mentioned problems in the conventional removal treatment of harmful substances from combustion exhaust gas. The present invention provides a method for removing harmful substances by which the three components of SOx, HCQ, and NOx can be removed simultaneously and at a high removal rate for each component.
（課題を解決するための手段）
本件請求項（１）に記載の発明は、従来のアルカリ剤を
用いた乾式法の如く、３５０℃以下の低温排ガス中へア
ルカリ剤を噴霧するのでは無く、燃焼室内の８００℃以
上の高温の燃焼ガスゾーンへアルカリ剤を吹き込むこと
を発明の基本構成とするものである。(Means for Solving the Problem) The invention described in claim (1) does not involve spraying an alkaline agent into low-temperature exhaust gas of 350° C. or lower, as in the conventional dry method using an alkaline agent. The basic structure of the invention is to inject an alkaline agent into the high temperature combustion gas zone of 800° C. or higher in the combustion chamber.
また、本件請求項（４）に記載の発明は、燃焼室内の８
００℃以上の高温の燃焼ガスゾーンヘアルカリ剤を吹き
込むと共に、排ガス内のＨＣＱやＳＯｘとアルカリ剤と
の反応生成物を集塵装置によって捕集することを発明の
基本構成とするものである。In addition, the invention described in claim (4) is based on the
The basic structure of the invention is to inject an alkaline agent into the combustion gas zone at a high temperature of 00° C. or higher, and to collect reaction products of HCQ and SOx in the exhaust gas with the alkaline agent using a dust collector.
（作用）
８００℃以上の高温の燃焼ガスゾーンへＮａＯＨ等のア
ルカリ剤を吹き込むことにより、■ＮＯｘの発生そのも
のが著しく低減すると同時に、■ＨＣｆｉやＳＯｘがア
ルカリ剤と反応して塩化ナトリウムや硫酸ナトリウム等
の塩類が形成される。(Function) By injecting an alkaline agent such as NaOH into the combustion gas zone at a high temperature of 800°C or higher, ■NOx generation itself is significantly reduced, and at the same time, ■HCfi and SOx react with the alkaline agent to produce sodium chloride and sodium sulfate. Salts such as salts are formed.
また、前記中和反応により形成された塩類は、燃焼排ガ
スの下流側に設置された集塵装置により捕集除去される
。Further, the salts formed by the neutralization reaction are collected and removed by a dust collector installed on the downstream side of the combustion exhaust gas.
前記「■ＮＯｘの発生そのものが低減する」という事象
の理由は未だ十分に解析されていないが、８００℃以上
の高温の燃焼ガスゾーンへアルカリ剤を吹き込むことに
より、後述する如くＣＯの発生が著しく増加することか
らして、アルカリ剤が燃焼反応そのもにの何等かの影響
を与え、これによりＮＯｘの発生そのものが抑えられた
ものと推定される。即ち、吹き込まれたアルカリ剤は、
■燃焼段階でＮＯｘの発生を抑える役割をしているか、
又は■発生したＮ Ｏｘを高温下でＮ２に還元する触媒
的な作用をしているか、或いは＠前記■及び■の前作用
を並列的に果たしているかの何れかであると推定される
。The reason for the above-mentioned phenomenon of "■ NOx generation itself is reduced" has not yet been fully analyzed, but by injecting an alkaline agent into the combustion gas zone at a high temperature of 800°C or higher, CO generation can be significantly reduced, as will be explained later. Judging from this increase, it is presumed that the alkali agent had some influence on the combustion reaction itself, thereby suppressing the generation of NOx itself. That is, the alkali agent blown into
■Does it play a role in suppressing the generation of NOx during the combustion stage?
It is presumed that either ① acts as a catalyst to reduce the generated NOx to N 2 at high temperatures, or ① plays the preceding functions of ① and ① in parallel.
（実施例） 以下、本発明の一実施例を具体的に説明する。(Example) Hereinafter, one embodiment of the present invention will be specifically described.
第１図は、本発明の実施に供した廃熱ボイラ付ごみ焼却
炉の概要を示すものであり、図に於いて１はごみ供給ホ
ッパー ２はプッシャー ３は乾燥ストーカ、４は燃焼
スト力、５は後燃焼スト力、６はコンベヤ、７は廃熱ボ
イラ、８は電気集塵装置、９は誘引ファン、１ｏは煙突
、１１は燃焼室である。FIG. 1 shows an outline of a waste incinerator equipped with a waste heat boiler used for implementing the present invention. In the figure, 1 is a waste supply hopper, 2 is a pusher, 3 is a drying stoker, 4 is a combustion force, 5 is a post-combustion force, 6 is a conveyor, 7 is a waste heat boiler, 8 is an electrostatic precipitator, 9 is an induction fan, 1o is a chimney, and 11 is a combustion chamber.
アルカリ剤の噴霧ノズル１２ａ、１２ｂ、１２ｃ。Alkaline agent spray nozzles 12a, 12b, 12c.
１２ｃｌはスト力３，４．５の上方に４個設けられてお
り、何れも燃焼が激しく行なわれている火炎中にある。Four 12cl units are installed above the 3 and 4.5 strokes, and all of them are in the flame where combustion is occurring intensely.
又、当該噴霧ノズル１２ａ、１２ｂ。Moreover, the said spray nozzle 12a, 12b.
１２ｃ、１２ｄは、何れもストーカ上の高温の燃焼ガス
中へ向けられており、各ノズルから所定流量のアルカリ
剤水溶液１３が噴出される。Both nozzles 12c and 12d are directed into the hot combustion gas above the stoker, and a predetermined flow rate of the alkaline agent aqueous solution 13 is ejected from each nozzle.
前記ごみ焼却炉は３００ Ｔｏｎ／２４１（ｒのごみ焼
却能力を有する平均的な都市ごみ焼却炉であり、その平
均排ガス量は８０．０００ＤｒｙＮｒｎ”／Ｈｒである
。The waste incinerator is an average municipal waste incinerator with a waste incineration capacity of 300 Ton/241 (r), and its average exhaust gas amount is 80.000 DryNrn''/Hr.
また、当該ごみ焼却炉のアルカリ剤水溶液を噴霧する前
に定常運転時に於ける排ガス中の有害酸物濃度（平均）
は第１表の通りであった。In addition, the concentration of harmful acids in the exhaust gas (average) during steady operation of the waste incinerator before spraying the alkaline aqueous solution.
were as shown in Table 1.
第１表 有害物の平均濃度（アルカリ剤噴霧前）本実施
例に於いては、アルカリ剤としてＮａＯＨを使用し、先
ず最初に、前記第１表に記載の濃度のＨＣＱとＳＯｘの
合計量を中和するために必要なＮａＯＨの理論計算量Ｑ
（ｋｇ／Ｈｒ）を算定しておく、即ち、平均排ガス量８
０．０ＯＯＮｒｒｌ’／Ｈｒの下に於ける前記ＮａＯＨ
の所要理論計算量Ｑ（ｋｇ／Ｈｒ）は、
Ｑ＝（７６０＋６０Ｘ２）Ｘ８０．０ＯＯＸ１Ｅ臀Ｘ４
０＝１２５．７ｋｇ／Ｈｒとなる。尚、ここで当該Ｑを
１当量と呼称する。Table 1 Average concentration of harmful substances (before alkali spraying) In this example, NaOH is used as the alkali agent, and first, the total amount of HCQ and SOx at the concentrations listed in Table 1 above is Theoretical calculation amount Q of NaOH required for neutralization
(kg/Hr), that is, the average exhaust gas amount 8
The above NaOH under 0.0OOONrrl'/Hr
The required theoretical calculation amount Q (kg/Hr) is: Q=(760+60X2)X80.0OOX1EbuttocksX4
0=125.7kg/Hr. In addition, the said Q is called 1 equivalent here.
次に、前記１２５．７ｋｇ／ＨｒのＮａＯＨを水溶液と
し、このアルカリ水溶液を前記４個のノズル１２から８
００℃以上の高温の燃焼ガス中へ噴霧した。Next, the 125.7 kg/Hr NaOH is made into an aqueous solution, and this alkaline aqueous solution is applied to the four nozzles 12 to 8.
It was sprayed into combustion gas at a high temperature of 00°C or higher.
高温燃焼ガス中へ噴霧されたＮ ａ ＯＨの水溶液は、
急速にその水分が蒸発され、ＮａＯＨの方はヒユーム状
となって燃焼ガス内へ混合されて行くことが観測されて
いる。The aqueous solution of N a OH sprayed into the high temperature combustion gas is
It has been observed that the moisture evaporates rapidly and NaOH becomes a fume and is mixed into the combustion gas.
前記ＮａＯＨの噴霧により生成した反応物は。The reactants generated by the above NaOH spraying are:
集塵装置８で捕集され、その結果ＳＯｘ、ＨＣＱ及びＮ
Ｏｘの除去率は夫々９０％、８５％及び４０％となった
。The dust collector 8 collects SOx, HCQ and N.
The removal rates of Ox were 90%, 85% and 40%, respectively.
下記の第２表は、同じごみ焼却炉に於いて、ＮａＯＨの
噴霧量を変えた場合の有害成分の除去率を示すものであ
り、ＮａＯＨの１当量は前述の通りＱ＝１２５．７ｋｇ
／Ｈｒである。Table 2 below shows the removal rate of harmful components when the amount of NaOH sprayed is changed in the same garbage incinerator, and as mentioned above, 1 equivalent of NaOH is Q = 125.7 kg.
/Hr.
第２表
有害物質の除去率（％）
前記ＮａＯＨ水溶液をストーカ上方の燃焼炎中へ噴霧す
ると、高温燃焼ゾーンに於けるＣＯ量が著しく増大する
ことが観測されている。第２図は、ＮａＯＨ水溶液（１
当量）を噴霧する前（曲線Ａ）と噴霧した後（曲線Ｂ）
の燃焼排ガス中のＣＯ量を示すものであり、Ｎ ａ Ｏ
Ｈの噴霧によりＣＯ量が急増する。このことは、前述の
如くアルカリ剤が燃焼反応に大きな影響を与えているこ
とを示すものであり、これによってＮＯｘの低減が誘起
されているものと推定される。Table 2 Removal rate of harmful substances (%) It has been observed that when the NaOH aqueous solution is sprayed into the combustion flame above the stoker, the amount of CO in the high temperature combustion zone increases significantly. Figure 2 shows the NaOH aqueous solution (1
Before (curve A) and after (curve B) spraying (equivalent amount)
It shows the amount of CO in the combustion exhaust gas of N a O
The amount of CO increases rapidly due to H spraying. This indicates that the alkaline agent has a large influence on the combustion reaction as described above, and it is presumed that this induces a reduction in NOx.
一方噴霧されたＮａＯＨと有害物質（ＳＯｘ。On the other hand, sprayed NaOH and harmful substances (SOx).
ＨＯ２）との中和反応によって発生した塩類は、排ガス
と共に集塵装置８へ導出され、ここで排ガス内から捕集
除去される。The salts generated by the neutralization reaction with HO2) are led to the dust collector 8 together with the exhaust gas, where they are collected and removed from the exhaust gas.
前記第２表の結果からも明らかな様に、噴霧するＮａＯ
Ｈ量は０．６〜１．４当量位が適量である。As is clear from the results in Table 2 above, the sprayed NaO
A suitable amount of H is 0.6 to 1.4 equivalents.
１．４当量以上のＮａＯＨを噴霧しても、有害成分の除
去率があまり向上しないうえ、燃焼の安定性等に悪影響
が出るからであり、また、０．６当量以下の場合には、
有害ガス除去率が十分でないからである。This is because even if 1.4 equivalents or more of NaOH is sprayed, the removal rate of harmful components will not improve much and the stability of combustion will be adversely affected.In addition, if the amount is 0.6 equivalents or less,
This is because the harmful gas removal rate is not sufficient.
また、Ｎ ａ ＯＨ水溶液はストーカ上方の燃焼炎内へ
噴霧するのが最適であり、温度が８００℃以下の燃焼ガ
ス内へＮ ａ ＯＨ水溶液を噴出しても、十分なＮＯｘ
の低減を図れないことが判明している。Furthermore, it is best to spray the NaOH aqueous solution into the combustion flame above the stoker, and even if the NaOH aqueous solution is sprayed into the combustion gas at a temperature of 800°C or less, it will not produce enough NOx.
It has been found that it is not possible to reduce the
更に、本実施例ではアルカリ剤としてＮａＯＨを使用し
ているが、ＫＯＨを使用した場合にもＮａＯＨの場合と
ほぼ同じ有害物質の除去率を得ることか可能なことが確
認されており、ＮａＯＨやＫＯＨ以外のアルカリ性物質
であっても良いことは勿論である。Furthermore, although NaOH is used as the alkaline agent in this example, it has been confirmed that it is possible to obtain almost the same removal rate of harmful substances when using KOH as with NaOH. Of course, alkaline substances other than KOH may be used.
（発明の効果）
本発明に於いては、８００℃以上の高温の燃焼ガスゾー
ンへアルカリ剤を吹き込んでアルカリ剤とＨＣＱ及びＳ
Ｏｘを中和反応させ、反応生成物を集塵装置により捕集
除去すると共に、燃焼反応へのアルカリ剤の影響を利用
してＮＯｘそのものの発生を抑制する構成としている。(Effect of the invention) In the present invention, an alkali agent is blown into a combustion gas zone at a high temperature of 800°C or higher, and the alkali agent, HCQ, and S
The structure is such that the oxygen is subjected to a neutralization reaction, the reaction products are collected and removed by a dust collector, and the generation of NOx itself is suppressed by utilizing the influence of the alkaline agent on the combustion reaction.
その結果、アルカリ剤を用いた乾式法により。As a result, by a dry method using an alkaline agent.
ＳＯｘ、ＨＣＱ及びＮＯｘの王者を同時にしかも高除去
率で除くことが可能となり、従前のＮｏの酸化装置を用
いたり、或いは二種類の除去方法を併用してＳＯｘ及び
ＨＣＱとＮＯｘとを夫々分けて除去する方法に比較して
、排ガス処理の設備費や運転費の大幅な引下げが可能と
なる。It is now possible to remove the kings of SOx, HCQ, and NOx at the same time and with a high removal rate, and it is now possible to use a conventional NO oxidation device or to use two types of removal methods together to separate SOx, HCQ, and NOx, respectively. Compared to removal methods, equipment costs and operating costs for exhaust gas treatment can be significantly reduced.
本発明は上述の通り、優れた実用的効用を有するもので
ある。As mentioned above, the present invention has excellent practical utility.
第１図は、−本発明を適用したごみ焼却炉の概要図であ
る。
第２図は、本発明を実施した場合の燃焼排ガス内のＣＯ
量を示す線図である。
３．４．５ ストーカ
７ 廃熱ボイラ
８、 集塵装置
１１ 燃焼室
１２ 噴霧ノズル
１３ アルカリ土類金属
第
１
図
第２図
Ｃ○
０
１
２
３
４
５
０２°１０
０発
０発
■出願人 円相
■出願人 三谷
＠出願人 茂木
禎
明度
岩夫
大阪府大阪市北区堂島浜１丁目３番お号 株式会社タク
マ内
大阪府大阪市北区堂島浜１丁目３番ｎ号 株式会社タク
マ内FIG. 1 is a schematic diagram of a waste incinerator to which the present invention is applied. Figure 2 shows the CO in the combustion exhaust gas when the present invention is implemented.
It is a diagram showing quantities. 3.4.5 Stoker 7 Waste heat boiler 8, Dust collector 11 Combustion chamber 12 Spray nozzle 13 Alkaline earth metal 1 Figure 2 C○ 0 1 2 3 4 5 02°10 0 shots 0 shots ■Applicant Enso ■ Applicant Mitani @ Applicant Yoshiaki Mogi Iwao 1-3 Dojimahama, Kita-ku, Osaka, Osaka Prefecture Takuma Co., Ltd. 1-3-n Dojimahama, Kita-ku, Osaka, Osaka Prefecture Takuma Co., Ltd.
Claims (4)
ンへアルカリ剤を吹き込むことを特徴とする燃焼排ガス
内の窒素酸化物、硫黄酸化物及び塩化水素の同時低減方
法。(1) A method for simultaneously reducing nitrogen oxides, sulfur oxides, and hydrogen chloride in combustion exhaust gas, which comprises blowing an alkaline agent into a high-temperature combustion gas zone of 800° C. or higher in a combustion device.
剤水溶液を高温の燃焼ガスゾーン内へ噴霧するようにし
た請求項（１）に記載の燃焼排ガス内の窒素酸化物、硫
黄酸化物及び塩化水素の同時低減方法。(2) Nitrogen oxides, sulfur oxides, and hydrogen chloride in the combustion exhaust gas according to claim (1), wherein an aqueous solution of an alkaline agent such as sodium hydroxide or potassium hydroxide is sprayed into the high-temperature combustion gas zone. How to simultaneously reduce
中和に必要とするアルカリ剤の理論計算量Ｑ（ｋｇ／Ｈ
ｒ）の０．６〜１．５倍のアルカリ剤を高温燃焼ガスゾ
ーンへ吹き込むようにした請求項（１）に記載の燃焼排
ガス内の窒素酸化物、硫黄酸化物及び塩化水素の同時低
減方法。(3) Theoretically calculated amount of alkaline agent required to neutralize the total amount of hydrogen chloride and sulfur oxide in the combustion exhaust gas
The method for simultaneously reducing nitrogen oxides, sulfur oxides, and hydrogen chloride in combustion exhaust gas according to claim (1), wherein the alkaline agent in an amount of 0.6 to 1.5 times r) is blown into the high-temperature combustion gas zone. .
ンへアルカリ剤の水溶液を噴霧すると共に、排ガス内の
硫黄酸化物及び塩化水素とアルカリ剤との中和反応生成
物を集塵装置により捕集することを特徴とする燃焼排ガ
ス内の窒素酸化物、硫黄酸化物及び塩化水素の同時低減
方法。(4) In addition to spraying an aqueous solution of an alkaline agent into the high-temperature combustion gas zone of 800°C or higher in the combustion equipment, the product of the neutralization reaction between sulfur oxides and hydrogen chloride in the exhaust gas and the alkaline agent is removed by a dust collector. A method for simultaneously reducing nitrogen oxides, sulfur oxides, and hydrogen chloride in combustion exhaust gas, the method comprising collecting them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1140819A JP2788997B2 (en) | 1989-06-01 | 1989-06-01 | Method for simultaneous reduction of nitrogen oxides, sulfur oxides and hydrogen chloride in flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1140819A JP2788997B2 (en) | 1989-06-01 | 1989-06-01 | Method for simultaneous reduction of nitrogen oxides, sulfur oxides and hydrogen chloride in flue gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH035616A true JPH035616A (en) | 1991-01-11 |
| JP2788997B2 JP2788997B2 (en) | 1998-08-20 |
Family
ID=15277462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1140819A Expired - Lifetime JP2788997B2 (en) | 1989-06-01 | 1989-06-01 | Method for simultaneous reduction of nitrogen oxides, sulfur oxides and hydrogen chloride in flue gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2788997B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001093988A1 (en) * | 2000-06-08 | 2001-12-13 | Clearstack Combustion Corporation | Potassium hydroxide flue gas injection technique to reduce acid gas emissions and improve electrostatic precipitator performance |
| JP2002333124A (en) * | 2001-03-09 | 2002-11-22 | Nippon Steel Corp | Method of inhibiting synthesis of dioxins and the like |
| JP2008200631A (en) * | 2007-02-21 | 2008-09-04 | Takuma Co Ltd | Method and apparatus for treating combustion exhaust gas |
| CN104906936A (en) * | 2015-06-06 | 2015-09-16 | 长春黄金研究院 | High temperature and high pressure desorbing electrolysis waste gas integrated utilization method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6286517B1 (en) * | 2016-12-07 | 2018-02-28 | 株式会社プランテック | Incinerator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52108365A (en) * | 1976-03-09 | 1977-09-10 | Ishikawajima Harima Heavy Ind Co Ltd | Removal of noxious components in exhaust gas |
| JPS60156563A (en) * | 1984-01-26 | 1985-08-16 | Mitsubishi Heavy Ind Ltd | Waste gas treating apparatus |
-
1989
- 1989-06-01 JP JP1140819A patent/JP2788997B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52108365A (en) * | 1976-03-09 | 1977-09-10 | Ishikawajima Harima Heavy Ind Co Ltd | Removal of noxious components in exhaust gas |
| JPS60156563A (en) * | 1984-01-26 | 1985-08-16 | Mitsubishi Heavy Ind Ltd | Waste gas treating apparatus |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001093988A1 (en) * | 2000-06-08 | 2001-12-13 | Clearstack Combustion Corporation | Potassium hydroxide flue gas injection technique to reduce acid gas emissions and improve electrostatic precipitator performance |
| JP2002333124A (en) * | 2001-03-09 | 2002-11-22 | Nippon Steel Corp | Method of inhibiting synthesis of dioxins and the like |
| JP2008200631A (en) * | 2007-02-21 | 2008-09-04 | Takuma Co Ltd | Method and apparatus for treating combustion exhaust gas |
| CN104906936A (en) * | 2015-06-06 | 2015-09-16 | 长春黄金研究院 | High temperature and high pressure desorbing electrolysis waste gas integrated utilization method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2788997B2 (en) | 1998-08-20 |
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