JPH074610A - Boiler with furnace desulphurization device - Google Patents
Boiler with furnace desulphurization deviceInfo
- Publication number
- JPH074610A JPH074610A JP14482093A JP14482093A JPH074610A JP H074610 A JPH074610 A JP H074610A JP 14482093 A JP14482093 A JP 14482093A JP 14482093 A JP14482093 A JP 14482093A JP H074610 A JPH074610 A JP H074610A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- limestone
- nozzle
- desulfurization
- desulphurization
- 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
Landscapes
- Incineration Of Waste (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は炉内脱硫装置を備えたボ
イラに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler equipped with a desulfurization device in a furnace.
【０００２】[0002]
【従来の技術】従来のボイラ炉内脱硫と炉外排煙の脱硫
を行う簡易排煙脱硫方式の系統図を図３によって説明す
る。図３において、１はボイラ火炉、２は燃料（例えば
微粉炭）と空気をボイラ火炉に供給する主バーナ風箱、
３は主バーナ風箱２によって形成される火炎中に石灰石
（ＣａＣＯ3 ）粉とアーフタエア（以下、ＡＡと略す）
を吹込むＡＡ風箱、６は集じん装置、７はミキシングタ
ンク、８はポンプを示す。この方式はＡＡ風箱３より吹
込まれるＣａＣＯ3 粉による炉内脱硫と、集じん装置６
で回収された未反応生石灰（ＣａＯ）及び灰分をミキシ
ングタンク内で水を加えて生成させたスラリをポンプ８
で排ガス煙道内に注入して脱硫する２段脱硫を行なわせ
る方式である。2. Description of the Related Art A conventional flue gas desulfurization system for desulfurizing a boiler inside a furnace and flue gas outside the furnace will be described with reference to FIG. In FIG. 3, 1 is a boiler furnace, 2 is a main burner wind box that supplies fuel (for example, pulverized coal) and air to the boiler furnace,
3 is limestone (CaCO 3 ) powder and after-air (hereinafter abbreviated as AA) in the flame formed by the main burner wind box 2.
Is an AA air box, 6 is a dust collector, 7 is a mixing tank, and 8 is a pump. This method uses desulfurization inside the furnace by CaCO 3 powder blown from the AA wind box 3 and dust collector 6
The unreacted quick lime (CaO) and ash collected in step 3 was added with water in a mixing tank to generate a slurry, which was pumped.
This is a method of performing two-stage desulfurization, in which it is injected into the exhaust gas flue and desulfurized.
【０００３】この図３のII−II断面矢視図を図２に示
す。図２は図１のボイラ火炉１におけるボイラ火炉１内
へのＣａＣＯ3 粉の投入方法を説明するものであり、Ｃ
ａＣＯ 3 粉はＡＡ風箱３内に設けた石灰石ノズル５から
ＡＡと同一方向にボイラ火炉１に投入している。FIG. 2 is a sectional view taken along line II-II of FIG.
You FIG. 2 shows the inside of the boiler furnace 1 in the boiler furnace 1 of FIG.
To CaCO3The method of adding powder is described below.
aCO 3The powder is from the limestone nozzle 5 provided in the AA wind box 3.
It is charged into the boiler furnace 1 in the same direction as AA.
【０００４】炉内脱硫では次の反応が行なわれていると
推定される。 ＣａＣＯ3 → ＣａＯ ＋ ＣＯ2 ＣａＯ ＋ ＳＯ2 ＋ 1/2Ｏ2 → ＣａＳＯ4 ここでの未反応ＣａＯは集じん装置６により回収され、
水と混合してスラリとすることで、ＣａＯ＋Ｈ2 Ｏ→Ｃ
ａ（ＯＨ）2 の反応により水酸化カルシウムを主成分と
するスラリとなる。It is presumed that the following reactions are carried out in desulfurization in a furnace. CaCO 3 → CaO + CO 2 CaO + SO 2 + 1 / 2O 2 → CaSO 4 The unreacted CaO here is recovered by the dust collector 6,
By mixing with water to make a slurry, CaO + H 2 O → C
The reaction of a (OH) 2 produces a slurry containing calcium hydroxide as a main component.
【０００５】次に、このスラリをボイラ火炉１後流の脱
硫煙道中に噴霧して２次脱硫を行なう。ここでは次の３
種類の反応が行なわれていると推定される。 Ｃａ（ＯＨ）2 ＋ＳＯ2 ＋ 1/2Ｏ2 → ＣａＳＯ4 ＋Ｈ2 Ｏ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ｃａ（ＯＨ）2 ＋ ＳＯ2 → ＣａＳＯ3 ＋ Ｈ2 Ｏ ＣａＳＯ3 ＋ 1/2Ｏ2 → ＣａＳＯ4 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ｈ2 Ｏ ＋ ＳＯ2 → Ｈ2 ＳＯ3 Ｈ2 ＳＯ3 ＋ ＣａＯ → ＣａＳＯ3 ＋ Ｈ2 Ｏ ＣａＳＯ3 ＋ 1/2Ｏ2 → ＣａＳＯ4 Next, this slurry is sprayed into the desulfurization flue downstream of the boiler furnace 1 for secondary desulfurization. Here is the next 3
It is estimated that some kind of reaction is taking place. Ca (OH) 2 + SO 2 + 1 / 2O 2 → CaSO 4 + H 2 O −−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ca ( OH) 2 + SO 2 → CaSO 3 + H 2 O CaSO 3 + 1 / 2O 2 → CaSO 4 −−−−−−−−−−−−−−−−−−−−−−−−−−−− --- H 2 O + SO 2 → H 2 SO 3 H 2 SO 3 + CaO → CaSO 3 + H 2 O CaSO 3 + 1 / 2O 2 → CaSO 4
【０００６】[0006]
【発明が解決しようとする課題】従来の簡易脱硫方式は
実験結果から火炉内脱硫率３０〜４０％と排ガス煙道で
の脱硫率６０〜７０％の組み合わせにより全体脱硫率７
０〜８０％となっている。この方式は一般に普及してい
る脱硫率９０〜９５％の湿式石灰・石こう法と比較して
経済性では断然有利であるものの、製品化・市場拡大す
るには更に脱硫効率を向上する必要がある。According to the experimental results, the conventional simple desulfurization system has a total desulfurization rate of 7 by combining a desulfurization rate of 30 to 40% in the furnace and a desulfurization rate of 60 to 70% in the exhaust gas flue.
It is 0 to 80%. Although this method is far more economical than the wet lime / gypsum method with a desulfurization rate of 90 to 95%, which is widely used, it is necessary to further improve the desulfurization efficiency in order to commercialize and expand the market. .
【０００７】本発明は上記技術水準及び要望に応じ、特
に炉内脱硫における脱硫効率を向上しうる炉内脱硫装置
を備えたボイラを提供しようとするものである。According to the above-mentioned state of the art and demands, the present invention intends to provide a boiler equipped with an in-furnace desulfurization device which can improve desulfurization efficiency particularly in in-furnace desulfurization.
【０００８】[0008]
【課題を解決するための手段】本発明はボイラ火炉内燃
焼火炎中に、アーフタエアと石灰石粉を定量投入して炉
内で発生する硫黄酸化物を除去する炉内脱硫装置を備え
たボイラにおいて、石灰石粉投入ノズルをアーフタエア
投入ノズルの吹出し角度よりも火炉壁面に沿うように外
向角度に配設してなることを特徴とする炉内脱硫装置を
備えたボイラである。Means for Solving the Problems The present invention relates to a boiler equipped with an in-furnace desulfurization device for removing sulfur oxides generated in the furnace by quantitatively introducing arft air and limestone powder into a combustion flame in a boiler furnace, A boiler equipped with an in-furnace desulfurization device, characterized in that the limestone powder charging nozzle is arranged at an outward angle so as to follow the wall surface of the furnace rather than at the blowing angle of the after-air charging nozzle.
【０００９】[0009]
【作用】炉内脱硫率は反応領域の温度、酸素濃度、滞留
時間に影響し、過去の経験からＡＡ領域にＣａＣＯ3 粉
を投入する場合が最も高い脱硫率が得られることが判っ
ている。又、従来例で述べた炉内脱硫反応式から、Ｃａ
ＣＯ3 がＣａＯに転換する割合が高い程、脱硫率が高く
なることは容易に推定できる。従来法の火炉出口灰の分
析結果から、２次脱硫反応に寄与しないＣａＯ以外の未
反応ＣａＣＯ3 は２０〜４０％含まれることが判ってお
り、この未反応ＣａＣＯ3 を何如に減少させるかが炉内
脱硫率向上のポイントとなる。The function of desulfurization in the furnace affects the temperature, oxygen concentration and residence time in the reaction region, and it has been known from the past experience that the highest desulfurization ratio can be obtained when CaCO 3 powder is added to the AA region. In addition, according to the in-furnace desulfurization reaction formula described in the conventional example, Ca
It can be easily estimated that the higher the rate of conversion of CO 3 to CaO, the higher the desulfurization rate. From the analysis result of the conventional furnace outlet ash, it is known that unreacted CaCO 3 other than CaO that does not contribute to the secondary desulfurization reaction is contained in 20 to 40%, and how to reduce this unreacted CaCO 3 This is the key to improving the desulfurization rate in the furnace.
【００１０】そこで１つの極端なケーススタディとして
図４に示す反応管モデルにて炉内脱硫率の調査を行なっ
た結果、図５の排ガス分析結果に示すように炉内脱硫率
が９０％以上となった。このモデルは電気ヒータにて反
応管温度を制御し、反応管上部から燃料を供給し、Ｃａ
ＣＯ3 粉は反応管中央部からＡＡと共に連続定量供給し
たもので、反応管底部は図示のようにテーパで絞ってい
る。反応管壁面及びテーパ部に付着堆積（スラッギン
グ）したＣａＣＯ3 粉の滞留時間は燃焼ガスの滞留時間
よりもはるかに長く、スラッギングしたＣａＣＯ3 のほ
ぼ１００％がＣａＯに転換したことで炉内脱硫率が向上
したものと推定される。本発明はこの作用を実炉に適用
したものであり、ＣａＣＯ3 を積極的に火炉壁面にスラ
ッギングさせることにより炉内脱硫率の向上を計るもの
である。Therefore, as one extreme case study, as a result of investigating the in-furnace desulfurization rate with the reaction tube model shown in FIG. 4, it was found that the in-reactor desulfurization rate was 90% or more as shown in the exhaust gas analysis result of FIG. became. This model controls the temperature of the reaction tube with an electric heater, supplies fuel from the upper part of the reaction tube, and
The CO 3 powder was continuously supplied together with AA from the central part of the reaction tube, and the bottom part of the reaction tube was tapered as shown in the figure. The residence time of CaCO 3 powder that has adhered and deposited (slugging) on the wall of the reaction tube and taper is much longer than the residence time of combustion gas, and almost 100% of the slugged CaCO 3 is converted to CaO. Is estimated to have improved. The present invention applies this action to an actual furnace, and intends to improve the desulfurization rate in the furnace by positively slugging CaCO 3 on the wall surface of the furnace.
【００１１】[0011]
【実施例】以下、本発明の一実施例の炉内脱硫装置を備
えたボイラを図１によって説明する。図１は本発明に係
る石灰石投入ノズルの配置を現わす図３のＩ−Ｉ断面矢
視図を示す。石灰石ノズル５はＡＡノズル４の吹出し角
度よりも外向きに配設しており、その仮想円（図中破
線）はＡＡノズル４仮想円の２〜４倍に拡げた（石灰石
ノズルによる仮想円は炉内幅の１／２〜１／４に相当す
る。）。また、石灰石の吹き出し流速はＡＡ流速の１．
５〜３倍高くすることで遠心力により石灰石の壁面到達
率を向上させた。従って、実機ＡＡ流速が略１５ｍ／ｓ
であることから石灰石吹出し流速は２０〜５０ｍ／ｓと
なる。このような条件下で石灰石粉を投入することによ
って９０％以上の脱硫率が得られる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A boiler equipped with an in-furnace desulfurization apparatus according to an embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a sectional view taken along the line I--I of FIG. 3 showing the arrangement of the limestone charging nozzle according to the present invention. The limestone nozzle 5 is arranged outward from the blowing angle of the AA nozzle 4, and its virtual circle (broken line in the figure) is expanded to 2 to 4 times the virtual circle of the AA nozzle 4 (the virtual circle by the limestone nozzle is It corresponds to 1/2 to 1/4 of the width in the furnace.) The flow rate of limestone is 1.
By increasing it 5 to 3 times, the wall surface arrival rate of limestone was improved by centrifugal force. Therefore, the actual machine AA flow velocity is approximately 15 m / s
Therefore, the flow rate of limestone is 20 to 50 m / s. By adding limestone powder under such conditions, a desulfurization rate of 90% or more can be obtained.
【００１２】[0012]
【発明の効果】本発明によれば、石灰石粉を選択的に火
炉壁面へスラッギングさせるようにすることができるの
で、スラッギングした石灰石粉の内、ほぼ１００％を脱
硫反応に寄与する生石灰に転換することができ、炉内脱
硫率の向上が図れる。EFFECTS OF THE INVENTION According to the present invention, limestone powder can be selectively slugged on the wall surface of the furnace, so that almost 100% of the slugged limestone powder is converted into quick lime that contributes to the desulfurization reaction. Therefore, the desulfurization rate in the furnace can be improved.
【図１】本発明の一実施例の炉内脱硫装置を備えたボイ
ラの石灰石粉投入の一態様を示す図で後述の図３のＩ−
Ｉ断面矢視図。FIG. 1 is a diagram showing one mode of charging limestone powder in a boiler equipped with an in-furnace desulfurization device according to one embodiment of the present invention, and is indicated by I- in FIG.
FIG.
【図２】従来の炉内脱硫装置を備えたボイラの石灰石粉
投入の一態様を示す図で後述の図３のII−II断面矢視
図。FIG. 2 is a view showing an aspect of charging limestone powder in a boiler equipped with a conventional in-furnace desulfurization device, and is a sectional view taken along the line II-II of FIG. 3 described later.
【図３】従来の炉内脱硫装置を備えたボイラ及び炉外脱
硫装置によるボイラの排ガスの脱硫装置の側面図。FIG. 3 is a side view of a boiler equipped with a conventional in-furnace desulfurization device and a desulfurization device for exhaust gas from a boiler by an out-furnace desulfurization device.
【図４】本発明の炉内脱硫装置を備えたボイラの作用を
説明するための実験装置の説明図。FIG. 4 is an explanatory view of an experimental device for explaining the operation of the boiler equipped with the in-furnace desulfurization device of the present invention.
【図５】図４の実験装置による脱硫効果を示す図表。5 is a chart showing the desulfurization effect by the experimental apparatus of FIG.
Claims (1)
アと石灰石粉を定量投入して炉内で発生する硫黄酸化物
を除去する炉内脱硫装置を備えたボイラにおいて、石灰
石粉投入ノズルをアーフタエア投入ノズルの吹出し角度
よりも火炉壁面に沿うように外向角度に配設してなるこ
とを特徴とする炉内脱硫装置を備えたボイラ。1. In a boiler equipped with an in-furnace desulfurization device for removing sulfur oxides generated in the furnace by quantitatively introducing arftaair and limestone powder into a combustion flame in a boiler furnace, the limestone powder charging nozzle is charged with the aftermath air. A boiler equipped with an in-furnace desulfurization device, which is arranged at an outward angle so as to follow the wall surface of the furnace rather than the blowing angle of the nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05144820A JP3073366B2 (en) | 1993-06-16 | 1993-06-16 | Boiler with in-furnace desulfurizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05144820A JP3073366B2 (en) | 1993-06-16 | 1993-06-16 | Boiler with in-furnace desulfurizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH074610A true JPH074610A (en) | 1995-01-10 |
| JP3073366B2 JP3073366B2 (en) | 2000-08-07 |
Family
ID=15371221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05144820A Expired - Fee Related JP3073366B2 (en) | 1993-06-16 | 1993-06-16 | Boiler with in-furnace desulfurizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3073366B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011012875A (en) * | 2009-07-01 | 2011-01-20 | Nippon Steel Engineering Co Ltd | Method and device for suppressing generation of hydrogen chloride gas in waste gasification melting furnace |
| WO2018066080A1 (en) * | 2016-10-04 | 2018-04-12 | 中国電力株式会社 | Method for suppressing elution of harmful trace elements and coal fired power generation system |
| CN116734265A (en) * | 2023-07-17 | 2023-09-12 | 中国环境科学研究院 | In-furnace control method for acidic pollutants in household garbage co-combustion industrial organic solid waste process |
-
1993
- 1993-06-16 JP JP05144820A patent/JP3073366B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011012875A (en) * | 2009-07-01 | 2011-01-20 | Nippon Steel Engineering Co Ltd | Method and device for suppressing generation of hydrogen chloride gas in waste gasification melting furnace |
| WO2018066080A1 (en) * | 2016-10-04 | 2018-04-12 | 中国電力株式会社 | Method for suppressing elution of harmful trace elements and coal fired power generation system |
| JPWO2018066080A1 (en) * | 2016-10-04 | 2018-10-04 | 中国電力株式会社 | Harmful trace element elution suppression method and coal thermal power generation system |
| CN116734265A (en) * | 2023-07-17 | 2023-09-12 | 中国环境科学研究院 | In-furnace control method for acidic pollutants in household garbage co-combustion industrial organic solid waste process |
| CN116734265B (en) * | 2023-07-17 | 2024-05-14 | 中国环境科学研究院 | In-furnace control method for acidic pollutants in household garbage co-combustion industrial organic solid waste process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3073366B2 (en) | 2000-08-07 |
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