JPS58150416A - Treatment of exhaust gas - Google Patents
Treatment of exhaust gasInfo
- Publication number
- JPS58150416A JPS58150416A JP57032266A JP3226682A JPS58150416A JP S58150416 A JPS58150416 A JP S58150416A JP 57032266 A JP57032266 A JP 57032266A JP 3226682 A JP3226682 A JP 3226682A JP S58150416 A JPS58150416 A JP S58150416A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- desulfurization
- limestone
- coal
- spray dryer
- 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.)
- Pending
Links
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は石炭だきボイラから排出される排ガス中の硫黄
酸化物およびダストを除去する排ガス処理方法に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust gas treatment method for removing sulfur oxides and dust from exhaust gas discharged from a coal-fired boiler.
従来石炭だきボイラから排出される排ガスの排煙脱硫を
含む排ガス処理方法においては、第1図に示すごとく、
排ガスはまず高温集塵機2に導入されて、排ガス中のダ
ストを含んだ石炭灰は除去される。In conventional exhaust gas treatment methods that include flue gas desulfurization of flue gas discharged from coal-fired boilers, as shown in Figure 1,
The exhaust gas is first introduced into the high-temperature dust collector 2, and coal ash containing dust in the exhaust gas is removed.
その際発生する石炭灰は集塵機2−下部より糸外へ排出
される。 しかる後、空気予熱器3を通過して、燃焼空
気を加熱後、昇圧通風機4により昇圧して石灰・石膏方
式やソーダ灰芒硝方式の湿式脱硫装置6へ導入される。The coal ash generated at this time is discharged from the lower part of the dust collector 2 to the outside of the thread. Thereafter, the combustion air passes through an air preheater 3, is heated, and is then pressurized by a pressure booster fan 4 and introduced into a wet desulfurization device 6 using a lime/gypsum method or a soda ash method.
これら湿式脱硫装置6では、石灰(生石灰、消石灰)、
ソーダ灰等の脱硫剤を抽入して脱硫し、その後煙突7か
ら系外へ排出される。In these wet desulfurization equipment 6, lime (quicklime, slaked lime),
A desulfurizing agent such as soda ash is extracted and desulfurized, and then it is discharged from the chimney 7 to the outside of the system.
しかし、このような方法においては、脱硫剤として使用
する石灰・ソーダ灰や水の消費量が大であり、しかもこ
れら脱硫剤は高価であり、ランニングコストが高くつく
。However, in such a method, the amount of lime/soda ash and water used as desulfurization agents is large, and these desulfurization agents are expensive, resulting in high running costs.
一方、ボイラでの炉内脱硫法の技術自体公知であるが1
単独でこの方法を用いても脱硫効果はあまり期待できな
いという欠点があった。On the other hand, although the technology of in-furnace desulfurization in a boiler itself is publicly known,
Even if this method is used alone, it has the disadvantage that very little desulfurization effect can be expected.
本発明は上記欠点を解消するためになされたもので、脱
硫剤として、石灰tソーダ灰を用いることなく、安価な
石灰石をボイラ火炉に直接吹き込むことによりボイラ火
炉内での脱硫効果を上げるとともに集塵装置で回収した
石炭灰をスラリーとしてスプレードライヤ型湿式脱硫装
置に抽入して脱硫することを特徴とする。The present invention was made to solve the above-mentioned drawbacks, and by injecting inexpensive limestone directly into the boiler furnace as a desulfurizing agent without using lime and soda ash, it increases the desulfurization effect in the boiler furnace and improves the concentration of limestone. It is characterized by desulfurization by extracting the coal ash collected by the dust device as a slurry into a spray dryer type wet desulfurization device.
以下、本発明の一実施例につき、第2図を参照して説明
する。Hereinafter, one embodiment of the present invention will be described with reference to FIG.
1は石炭だきボイラで石炭を投入し、後述する空気予熱
器3で加熱された燃焼空気が導入されて、石炭が燃焼さ
れることとなる。 3は空気予熱器で、排ガス中の熱を
利用して送風機5を介し供給される空気を加熱し、石炭
だきボイラ1へ導入する燃焼空気とするものである。1 is a coal-fired boiler in which coal is charged, combustion air heated by an air preheater 3 (described later) is introduced, and the coal is combusted. Reference numeral 3 denotes an air preheater that heats the air supplied via the blower 5 using heat in the exhaust gas, and converts it into combustion air to be introduced into the coal-fired boiler 1.
8はスプレードライヤ型湿式脱硫装置で、水および石炭
灰等が混入しているスラリーが入っているスラリータン
ク11からスラリーを液状吸収剤として噴震し、さらに
、空気予熱器3を通過する排ガスを導入して接触せしめ
ることにより、硫黄−化物が除去される。8 is a spray dryer type wet desulfurization equipment, which ejects slurry as a liquid absorbent from a slurry tank 11 containing slurry mixed with water, coal ash, etc., and further discharges exhaust gas passing through an air preheater 3. By introducing and bringing into contact, sulfur compounds are removed.
9は低温の電気集塵装置で排ガス中のダストを除塵する
ものである。 5は強制送風機、10は誘引通風機であ
る。9 is a low-temperature electrostatic precipitator that removes dust from exhaust gas. 5 is a forced draft fan, and 10 is an induced draft fan.
以上の構成において、まず石炭だきボイラ1に直接石灰
石を吹き込み炉内脱硫を行う。 この際吹き込まれた石
灰石は900℃以上の燃焼ガス中でただちに分解して生
石灰(Cab)となり、1250℃以下の温度域でガス
中の亜硫酸ガスおよび酸素と反応して硫酸カルシウムを
生成する。In the above configuration, first, limestone is directly blown into the coal-fired boiler 1 to perform in-furnace desulfurization. The limestone injected at this time immediately decomposes into quicklime (Cab) in the combustion gas at a temperature of 900°C or higher, and reacts with sulfur dioxide gas and oxygen in the gas at a temperature of 1250°C or lower to produce calcium sulfate.
900′C以上
CaCO3CaO+CO2・・・・・・・・・(1)C
aO+S()、 +JzO,−シ狙勇咀込上Ca EA
−”−(2)次に石炭だきボイラから排出された排ガ
スは空気予熱器3を通過し、スプレードライヤ型湿式脱
硫装置8に導入される。900'C or more CaCO3CaO+CO2・・・・・・・・・(1)C
aO+S(), +JzO, -Shiyaku Mikkomi Ca EA
-"- (2) Next, the exhaust gas discharged from the coal-fired boiler passes through the air preheater 3 and is introduced into the spray dryer type wet desulfurization device 8.
導入された排ガスはスラリータンク11に貯留している
スラリーと接触して硫黄−化物が除去される。 このス
ラリーは、後置の低温電気集塵装置9およびこのスプレ
ードライヤ型湿式脱硫装置8からのダストを含んだ石炭
灰を循環してスラリータンク11へ供給し、水と混合さ
せたものである。The introduced exhaust gas comes into contact with the slurry stored in the slurry tank 11 to remove sulfur compounds. This slurry is made by circulating coal ash containing dust from the downstream low-temperature electrostatic precipitator 9 and this spray dryer type wet desulfurization device 8, supplied to the slurry tank 11, and mixed with water.
を含も石炭灰はスラリータンク11へ、さらに除塵され
た清浄ガスは煙突7から誘引通風機・10を介して系外
へと排出される。The coal ash including coal ash is discharged to the slurry tank 11, and the cleaned gas from which dust has been removed is discharged from the chimney 7 to the outside of the system via the induced draft fan 10.
本発明によれば、ボイラ本体を反応器として利用するの
で、後置のスプレードライヤ型湿式脱硫装置や集塵装置
等の付加設備が小型化できるばかりでなく、価格の低廉
な石灰石を利用し、かつ、不プレードライヤ型湿式脱硫
装置では新たな石灰石を必要としないので、消費量が少
なく済み、ランミングコストが低価となる利点゛を有す
る。According to the present invention, since the boiler main body is used as a reactor, additional equipment such as a spray dryer-type wet desulfurization device and a dust collector installed downstream can not only be downsized, but also inexpensive limestone can be used. In addition, since the non-plated dryer type wet desulfurization equipment does not require new limestone, it has the advantage that the consumption amount is small and the ramming cost is low.
第1図は従来の石灰・石膏方式やソーダ灰芒硝方式の湿
式脱硫装置を含む排ガスの処理方法の概略図、第2図は
本発明のスプレードライヤ型湿式脱硫装置を含む排・ガ
ス処理刃♂の概略図である。
1・・・石炭だきボイラ 2・・・高温集塵機3・
・・空気予熱器 4・・・昇圧送風機5・・・
強制送風機
6・・・石灰・石膏方式やソーダ灰芒硝方式の湿式脱硫
装置
7・・・煙 突
8・・・スプレードライヤ型湿式脱硫装置9・・・・低
温集塵装置 10・・・誘引通風機110・スラリ
ータンクFigure 1 is a schematic diagram of an exhaust gas treatment method including a conventional lime/gypsum method or soda ash type wet desulfurization equipment, and Figure 2 is an exhaust/gas treatment blade including a spray dryer type wet desulfurization equipment of the present invention. FIG. 1...Coal-fired boiler 2...High temperature dust collector 3.
... Air preheater 4 ... Boost blower 5 ...
Forced air blower 6... Lime-gypsum method or soda ash type wet desulfurization device 7... Chimney 8... Spray dryer type wet desulfurization device 9... Low temperature dust collector 10... Induced draft Machine 110/Slurry tank
Claims (1)
ヤ゛型温式脱硫装置および集塵装置を通過せしめて、排
ガス中の硫黄徴化物および石炭灰を除去する方法におい
て、該ボイラに直接石灰石を吹を行うことを特徴とする
排ガス処理方法。A method for removing sulfur compounds and coal ash from the exhaust gas by passing the exhaust gas discharged from a coal-fired boiler through a spray dryer-type thermal desulfurization device and a dust collector, in which limestone is directly blown into the boiler. An exhaust gas treatment method characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57032266A JPS58150416A (en) | 1982-03-03 | 1982-03-03 | Treatment of exhaust gas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57032266A JPS58150416A (en) | 1982-03-03 | 1982-03-03 | Treatment of exhaust gas |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58150416A true JPS58150416A (en) | 1983-09-07 |
Family
ID=12354198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57032266A Pending JPS58150416A (en) | 1982-03-03 | 1982-03-03 | Treatment of exhaust gas |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58150416A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4925614A (en) * | 1985-02-13 | 1990-05-15 | Rheinisch-Westfalisches Elektrizitatswerk Aktiengesellschaft | Method of making shaped bodies for use in the construction trades from power-plant clarifier sludge |
JPH03213124A (en) * | 1990-01-18 | 1991-09-18 | Mitsubishi Heavy Ind Ltd | Desulfurizing method |
-
1982
- 1982-03-03 JP JP57032266A patent/JPS58150416A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4925614A (en) * | 1985-02-13 | 1990-05-15 | Rheinisch-Westfalisches Elektrizitatswerk Aktiengesellschaft | Method of making shaped bodies for use in the construction trades from power-plant clarifier sludge |
JPH03213124A (en) * | 1990-01-18 | 1991-09-18 | Mitsubishi Heavy Ind Ltd | Desulfurizing method |
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