JPH0221853B2 - - Google Patents
Info
- Publication number
- JPH0221853B2 JPH0221853B2 JP57095689A JP9568982A JPH0221853B2 JP H0221853 B2 JPH0221853 B2 JP H0221853B2 JP 57095689 A JP57095689 A JP 57095689A JP 9568982 A JP9568982 A JP 9568982A JP H0221853 B2 JPH0221853 B2 JP H0221853B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- gypsum
- sulfuric acid
- produce
- direct reduction
- 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
- 238000000034 method Methods 0.000 claims description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- 238000006477 desulfuration reaction Methods 0.000 claims description 13
- 230000023556 desulfurization Effects 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 10
- 239000010440 gypsum Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 229940043430 calcium compound Drugs 0.000 claims description 4
- 150000001674 calcium compounds Chemical class 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000007800 oxidant agent Substances 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
【発明の詳細な説明】
この発明は、炭素質固体還元剤と脱流剤（例え
ば石灰、ドロマイト）を使用する直接還元製鉄
（以下DRという）プロセスにおける湿式排ガス
脱硫方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for wet exhaust gas desulfurization in a direct reduction ironmaking (DR) process using a carbonaceous solid reducing agent and a deflow agent (eg, lime, dolomite).
従来から、湿式排ガス脱硫方法として、排ガス
中の二酸化イオウを水により吸収して亜硫酸を生
成し、この亜硫酸を酸化させて硫酸とする脱硫工
程と、前記硫酸にカルシウム化合物を加えて石膏
とする石膏工程とからなる脱硫方法が知られてい
る。 Conventionally, wet flue gas desulfurization methods include a desulfurization process in which sulfur dioxide in flue gas is absorbed by water to produce sulfurous acid, and this sulfurous acid is oxidized to produce sulfuric acid, and a gypsum process in which a calcium compound is added to the sulfuric acid to produce gypsum. A desulfurization method is known which consists of steps.
この発明は、このような湿式排ガス脱硫方法を
DRプロセスに適用し、DRプロセス特有の廃棄
物を利用して新たにカルシウム化合物を投入する
ことなく安価に脱硫を行なえるようにしたもので
ある。 This invention utilizes such a wet exhaust gas desulfurization method.
This method is applied to the DR process, making it possible to perform desulfurization at low cost without adding new calcium compounds by using waste material unique to the DR process.
以下、この発明を図示する実施例に基づいて説
明する。図面に示すように、DRプロセスから排
出された排ガスＧは、プレスクラバー１に導入さ
れ、ここで冷却水W1により冷却および排ガスＧ
中のダストＤ処理が行なわれる。 The present invention will be described below based on illustrated embodiments. As shown in the drawing, the exhaust gas G discharged from the DR process is introduced into the prescrubber 1, where it is cooled by cooling water W1 and the exhaust gas G is
Dust D treatment inside is performed.
プレスクラバー１を出た排ガスは、吸収装置２
の底部へ送られ、後段の酸化装置３をオーバーフ
ローした吸収液Lqにより排ガス中のSO2が吸収さ
れ、亜硫酸H2SO3（SO3＋H2O→H2SO3）が生成
される。除去された排ガスは頂部より排出され、
白煙防止と拡散のために再加熱器４で加熱され大
気に放出される。 The exhaust gas leaving the pre-scrubber 1 is transferred to the absorption device 2.
The SO 2 in the exhaust gas is absorbed by the absorption liquid Lq that overflows the oxidizer 3 in the latter stage, and sulfurous acid H 2 SO 3 (SO 3 +H 2 O→H 2 SO 3 ) is generated. The removed exhaust gas is discharged from the top,
In order to prevent and diffuse white smoke, it is heated in a reheater 4 and released into the atmosphere.
生成した亜硫酸H2SO3は、酸化装置３に送ら
れて空気O2により硫酸H2SO4（H2SO3＋１／２O2→
H2SO4）となる。この硫酸は、酸化装置３頂部
から大部分が吸収液Lqとして吸収装置２へ戻り、
残りが次の石膏工程の晶析槽５へ送られる。 The generated sulfite H 2 SO 3 is sent to the oxidizer 3 and converted into sulfuric acid H 2 SO 4 (H 2 SO 3 +1/2O 2 → H 2 SO 4 ) by air O 2 . Most of this sulfuric acid returns from the top of the oxidizer 3 to the absorber 2 as an absorption liquid Lq.
The remainder is sent to the crystallization tank 5 for the next gypsum process.
晶析槽５には、CaO、CaS等からなるDRプロ
セル廃棄物Mxがスラリ状で導入され、ここで、
スラリ状となつたCaOはCa（OH）2として存在す
る。 DR process waste Mx consisting of CaO, CaS, etc. is introduced in the form of a slurry into the crystallization tank 5, and here,
The slurry of CaO exists as Ca(OH) 2 .
晶析槽５では、硫酸H2SO4とCaS、Ca（OH）2
とが反応し（H2SO4＋CaS→CaSO4＋H2S、
H2SO4＋Ca（OH）2→CaSO4＋2H2O）、石こう
（CaSO4）ができる。これにより発生した硫化水
素H2Sは次の二つの方法で処理される。 In crystallization tank 5, sulfuric acid H 2 SO 4 and CaS, Ca(OH) 2
(H 2 SO 4 +CaS→CaSO 4 +H 2 S,
H 2 SO 4 +Ca(OH) 2 →CaSO 4 +2H 2 O), gypsum (CaSO 4 ) is formed. The hydrogen sulfide H 2 S generated thereby is treated in the following two ways.
(i) 晶析槽５より排出された硫化水素H2Sは、燃
焼炉６で燃焼され（H2S＋３／２O2→SO2＋
H2O）、これにより発生したSO2を再びプレス
クラバー１へ戻す。(i) Hydrogen sulfide H 2 S discharged from the crystallization tank 5 is burned in the combustion furnace 6 (H 2 S + 3/2O 2 → SO 2 + H 2 O), and the SO 2 generated thereby is returned to the pre-scrubber. Return to 1.
(ii) 硫化水素H2Sをクラウス反応炉７へ送り、ク
ラウス（2H2S＋SO2→3S〔単体〕＋H2O）によ
り単体Ｓを回収する。(ii) Hydrogen sulfide H 2 S is sent to the Claus reactor 7, and simple S is recovered by Claus (2H 2 S + SO 2 → 3S [single] + H 2 O).
晶析槽５から出てきた石こうCaSO4は、遠心
分離機７と洗浄水W2で洗浄し、石こうを回収
する。 The gypsum CaSO 4 coming out of the crystallization tank 5 is washed with a centrifuge 7 and washing water W 2 to recover the gypsum.
なお、晶析槽５へは補助用のH2SO4および
CaCO3が投入される。 In addition, auxiliary H 2 SO 4 and
CaCO 3 is introduced.
このような湿式排ガス脱硫方法において、DR
プロセスの廃棄物CaO、CaSを脱硫工程で生成し
た硫酸の中和剤として利用し、全く無公害な石こ
うとして廃棄物処理を行なうことができる。さら
に、硫酸の中和の際に発生した硫化水素を燃焼に
よつてSOxとして再処理するか、あるいはクラウ
ス反応によつて単体Ｓを回収し、無公害の脱硫を
行ない得る。 In such a wet flue gas desulfurization method, DR
Process wastes CaO and CaS can be used as neutralizing agents for the sulfuric acid produced in the desulfurization process, and can be treated as completely non-polluting gypsum. Furthermore, the hydrogen sulfide generated during neutralization of sulfuric acid can be reprocessed as SOx by combustion, or elemental S can be recovered by Claus reaction to perform pollution-free desulfurization.
図面は、この発明に係る脱硫方法を実施するた
めの系統図である。
１……プレスクラバー、２……吸収装置、３…
…酸化装置、４……再加熱器、５……晶析槽、６
……燃焼炉、７……遠心分離機。
The drawing is a system diagram for implementing the desulfurization method according to the present invention. 1... Pre-scrubber, 2... Absorption device, 3...
...Oxidizer, 4...Reheater, 5...Crystallization tank, 6
... Combustion furnace, 7 ... Centrifugal separator.
Claims (1)
化イオウを水により吸収して亜硫酸を生成し、こ
の亜硫酸を酸化させて硫酸とする脱硫工程と、前
記硫酸にカルシウム化合物を加えて石膏とする石
膏工程とからなる湿式排ガス脱硫方法において、
前記カルシウム化合物として直接還元製鉄プロセ
スの廃棄物を使用し、石膏工程で生成した硫化水
素を燃焼させ生成した二酸化イオウを再び最初の
排ガスラインに戻すか、あるいはクラウス反応に
よつて単体イオウを回収することを特徴とする直
接還元製鉄プロセスにおける湿式排ガス脱硫方
法。1. A desulfurization process in which sulfur dioxide in the exhaust gas from the direct reduction ironmaking process is absorbed by water to produce sulfurous acid, and this sulfurous acid is oxidized to produce sulfuric acid; and a gypsum process in which a calcium compound is added to the sulfuric acid to produce gypsum. In a wet flue gas desulfurization method consisting of
Waste from the direct reduction ironmaking process is used as the calcium compound, and the hydrogen sulfide produced in the gypsum process is combusted and the produced sulfur dioxide is returned to the first exhaust gas line, or elemental sulfur is recovered by Claus reaction. A wet exhaust gas desulfurization method in a direct reduction ironmaking process characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57095689A JPS58214321A (en) | 1982-06-04 | 1982-06-04 | Wet desulfurization of exhaust gas in direct reduction iron manufacturing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57095689A JPS58214321A (en) | 1982-06-04 | 1982-06-04 | Wet desulfurization of exhaust gas in direct reduction iron manufacturing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58214321A JPS58214321A (en) | 1983-12-13 |
| JPH0221853B2 true JPH0221853B2 (en) | 1990-05-16 |
Family
ID=14144455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57095689A Granted JPS58214321A (en) | 1982-06-04 | 1982-06-04 | Wet desulfurization of exhaust gas in direct reduction iron manufacturing process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58214321A (en) |
-
1982
- 1982-06-04 JP JP57095689A patent/JPS58214321A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58214321A (en) | 1983-12-13 |
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