JP3073366B2 - Boiler with in-furnace desulfurizer - Google Patents
Boiler with in-furnace desulfurizerInfo
- Publication number
- JP3073366B2 JP3073366B2 JP05144820A JP14482093A JP3073366B2 JP 3073366 B2 JP3073366 B2 JP 3073366B2 JP 05144820 A JP05144820 A JP 05144820A JP 14482093 A JP14482093 A JP 14482093A JP 3073366 B2 JP3073366 B2 JP 3073366B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- desulfurization
- boiler
- limestone
- powder
- 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 - Fee Related
Links
- 238000006477 desulfuration reaction Methods 0.000 claims description 39
- 230000023556 desulfurization Effects 0.000 claims description 39
- 235000019738 Limestone Nutrition 0.000 claims description 17
- 239000006028 limestone Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 14
- 239000000292 calcium oxide Substances 0.000 description 11
- 235000012255 calcium oxide Nutrition 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 239000011575 calcium Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000009491 slugging Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 102220579497 Macrophage scavenger receptor types I and II_F23C_mutation Human genes 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
Landscapes
- Incineration Of Waste (AREA)
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 provided with an in-furnace desulfurizer.
【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 system diagram of a conventional simple flue gas desulfurization system for performing desulfurization in a boiler furnace and desulfurization of 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 for supplying fuel (for example, pulverized coal) and air to the boiler furnace,
Reference numeral 3 denotes limestone (CaCO 3 ) powder and after air (hereinafter abbreviated as AA) in the flame formed by the main burner wind box 2.
, A dust collecting device, a mixing tank, and a pump. This method includes desulfurization in a furnace using CaCO 3 powder blown from an AA wind box 3 and a dust collecting device 6.
The unreacted quick lime (CaO) and ash collected in the above step are mixed with water in a mixing tank to produce a slurry.
In this method, two-stage desulfurization is performed, in which the fuel 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 the line II-II of FIG.
You. FIG. 2 shows the inside of the boiler furnace 1 in the boiler furnace 1 of FIG.
CaCO toThreeIt explains the method of charging the powder.
aCO ThreeThe powder comes from the limestone nozzle 5 provided in the AA-like box 3
It is thrown 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。The following reaction is presumed to take place in furnace desulfurization. CaCO 3 → CaO + CO 2 CaO + SO 2 + 1 / 2O 2 → CaSO 4 Unreacted CaO here is recovered by the dust collecting device 6,
By mixing with water to form a slurry, CaO + H 2 O → C
The reaction of a (OH) 2 results in 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, the slurry is sprayed into a desulfurization flue downstream of the boiler furnace 1 to perform secondary desulfurization. Here is the next 3
It is assumed 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 conventional simple desulfurization method, the total desulfurization rate is 7 by the combination of the desulfurization rate in the furnace of 30 to 40% and the desulfurization rate in the exhaust gas flue of 60 to 70%.
0 to 80%. Although this method is far more economically advantageous than the commonly used wet lime / gypsum method with a desulfurization rate of 90 to 95%, 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。[0007] The present invention is directed to provide a boiler provided with an in-furnace desulfurization apparatus capable of improving the desulfurization efficiency particularly in the in-furnace desulfurization in response to the above technical level and demand.
【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。SUMMARY OF THE INVENTION The present invention relates to a boiler provided with an in-furnace desulfurization apparatus for removing sulfur oxides generated in a furnace by quantitatively charging after air and limestone powder into a combustion flame in a boiler furnace. A boiler provided with an in-furnace desulfurization device, wherein a limestone powder input nozzle is disposed at an outward angle along the furnace wall surface with respect to a blowing angle of an after air air injection 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 desulfurization rate in the furnace affects the temperature, oxygen concentration and residence time in the reaction zone, and it has been found from the past experience that the highest desulfurization rate is obtained when CaCO 3 powder is introduced into the AA zone. Also, from the in-furnace desulfurization reaction formula described in the prior art, 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 results of the furnace outlet ash of the conventional method, 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 the unreacted CaCO 3 is determined. This is the point for 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。As one extreme case study, the furnace desulfurization rate was investigated using the reaction tube model shown in FIG. 4, and as shown in the exhaust gas analysis results in FIG. 5, the furnace desulfurization rate was 90% or more. became. In this model, the temperature of the reaction tube is controlled by an electric heater, fuel is supplied from the top of the reaction tube, and Ca
The CO 3 powder was continuously supplied together with AA from the center of the reaction tube, and the bottom of the reaction tube was narrowed by a taper as shown in the figure. The reaction tube wall and attached deposited tapered portion (slugging) was CaCO 3 powder residence time is much longer than the residence time of the combustion gas, furnace desulfurization rate by almost 100% was converted to CaO of CaCO 3 was slugging Is estimated to have improved. The present invention applies this effect to an actual furnace, and aims to improve the in-furnace desulfurization rate by positively slugging CaCO 3 on the furnace wall.
【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 provided with an in-furnace desulfurization apparatus according to one embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a sectional view taken along the line II of FIG. 3 showing an arrangement of a limestone charging nozzle according to the present invention. The limestone nozzle 5 is disposed more outward than 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 (Corresponds to 1/2 to 1/4 of the furnace inner width.) Also, the limestone blowing velocity is 1.A of the AA velocity.
By increasing the height by 5 to 3 times, centrifugal force improved the limestone wall reach ratio. Therefore, the actual machine AA flow rate is approximately 15 m / s.
Therefore, the limestone blowing velocity 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。According to the present invention, since limestone powder can be selectively slugged to the furnace wall, almost 100% of the slugged limestone powder is converted to quicklime which contributes to the desulfurization reaction. 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 view showing one mode of charging limestone powder into a boiler provided with an in-furnace desulfurization apparatus according to one embodiment of the present invention, which is described later with reference to 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 one mode of charging limestone powder into a boiler provided with a conventional in-furnace desulfurization apparatus, and is a sectional view taken along the line II-II of FIG.
【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 provided with a conventional in-furnace desulfurizer and a boiler exhaust gas desulfurizer using an out-of-furnace desulfurizer.
【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 apparatus for explaining the operation of a boiler provided with the in-furnace desulfurization apparatus 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。FIG. 5 is a table showing the desulfurization effect of the experimental apparatus of FIG.
フロントページの続き (56)参考文献 特開 平３−254815（ＪＰ，Ａ) 特開 昭61−96319（ＪＰ，Ａ) 実開 昭61−53615（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F23C 11/00 F23J 7/00 F23J 15/00 Continuation of front page (56) References JP-A-3-254815 (JP, A) JP-A-61-96319 (JP, A) JP-A-61-53615 (JP, U) (58) Fields investigated (Int) .Cl. 7 , DB name) F23C 11/00 F23J 7/00 F23J 15/00
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. A boiler equipped with an in-furnace desulfurization device that removes sulfur oxides generated in a furnace by quantitatively introducing after air and limestone powder into a combustion flame in a boiler furnace, and introducing a limestone powder input nozzle to the after air. A boiler provided with an in-furnace desulfurization device, which is disposed at an outward angle along the furnace wall surface rather than the nozzle blowing angle.
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 JPH074610A (en) | 1995-01-10 |
| JP3073366B2 true 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) |
Families Citing this family (4)
| 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 |
| JP2024118818A (en) * | 2023-02-21 | 2024-09-02 | 中国電力株式会社 | Dissolution prevention agent injection device |
| CN116734265B (en) * | 2023-07-17 | 2024-05-14 | 中国环境科学研究院 | A method for controlling acidic pollutants in a furnace during the combustion of domestic garbage mixed with industrial organic solid waste |
-
1993
- 1993-06-16 JP JP05144820A patent/JP3073366B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH074610A (en) | 1995-01-10 |
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