JPH0773658B2 - Exhaust gas desulfurization method - Google Patents
Exhaust gas desulfurization methodInfo
- Publication number
- JPH0773658B2 JPH0773658B2 JP63084106A JP8410688A JPH0773658B2 JP H0773658 B2 JPH0773658 B2 JP H0773658B2 JP 63084106 A JP63084106 A JP 63084106A JP 8410688 A JP8410688 A JP 8410688A JP H0773658 B2 JPH0773658 B2 JP H0773658B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- absorption tower
- gas
- liquid
- wall
- 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 title claims description 10
- 230000023556 desulfurization Effects 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims description 50
- 238000010521 absorption reaction Methods 0.000 claims description 48
- 239000007789 gas Substances 0.000 claims description 35
- 230000002745 absorbent Effects 0.000 claims description 12
- 239000002250 absorbent Substances 0.000 claims description 12
- 229940043430 calcium compound Drugs 0.000 claims description 8
- 150000001674 calcium compounds Chemical class 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000012856 packing Methods 0.000 description 6
- 230000012447 hatching Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 239000011575 calcium Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、冷却塔を用いず直接カルシウム化合物を含有
する吸収液で排ガスを処理する湿式の排ガスの脱硫方法
に関する。The present invention relates to a wet exhaust gas desulfurization method for treating exhaust gas directly with an absorbent containing a calcium compound without using a cooling tower.
第３図の概念図を用いて従来の吸収液と排ガスとを気液
接触させる脱硫方法に説明する。吸収塔１の塔頂より導
入された水分未飽和排ガス３に対向して複数の母管７の
各々に取付けられた複数のノズル６から吸収液２を噴出
させて気液接触させ、さらに気液接触面積の向上のため
その下流に充填物４を設けて排煙等の排ガスの脱硫を行
なっていた。A conventional desulfurization method for bringing an absorbent and exhaust gas into gas-liquid contact will be described with reference to the conceptual diagram of FIG. The absorbing liquid 2 is ejected from a plurality of nozzles 6 attached to each of a plurality of mother pipes 7 so as to face the water-unsaturated exhaust gas 3 introduced from the top of the absorption tower 1, and the gas-liquid contact is made. In order to improve the contact area, a filler 4 was provided downstream of the contact area to desulfurize exhaust gas such as flue gas.
ところが、上記の脱硫方法においては、第３図に示した
充填物４の壁寄り部分にハッチングで示した部分ａや吸
収塔１の吸収液２の噴出部分に近い壁面のハッチングで
示した部分ｂなどでカルシウム化合物のスケールが発生
した。これは、吸収塔１の壁近くではノズル６から噴出
している吸収液２の噴出量が吸収塔１の内部よりも少な
くなることと、吸収塔１の塔頂から導入した排ガス３が
水分未飽和であり吸収液１の壁寄りでは充分に増湿され
ていないことが原因と考えられる。即ち、吸収塔１の内
でのノズルからの吸収液の噴出分布状況の概念図である
第４図に示すように、黒丸で示したノズル６′から噴出
した吸収液は線２′で示す拡がりをもつが、吸収塔１の
中央部分でのノズル６′から噴出した吸収液の拡がりは
互いに隣接するノズル６′から噴出している吸収液の拡
がりの範囲が重なる部分があり充分吸収液が充分に分散
されている。しかし、吸収塔１の内壁部分にハッチング
ｃで示した部分などは全く吸収液が分散されておらず、
このためこの部分は排ガスの通気圧力損失も低くなり排
ガスは吸収等の中央部よりもより多く流れやすい環境と
なる。このように、吸収塔の内壁寄りでは噴出液量が少
なく、然も増湿されていない排ガスが吸収塔の内部より
多く流れやすくなっているために第３図のｂ部やａ部で
スケーリングがみられていた。However, in the above desulfurization method, a portion a indicated by hatching on the wall-side portion of the packing 4 shown in FIG. 3 and a portion b indicated by hatching on the wall surface near the jetted portion of the absorbing liquid 2 of the absorption tower 1 are indicated. As a result, a scale of calcium compound was generated. This is because the amount of the absorbing liquid 2 ejected from the nozzle 6 near the wall of the absorption tower 1 is smaller than that inside the absorption tower 1, and the exhaust gas 3 introduced from the top of the absorption tower 1 does not contain water. It is considered that the reason is that the saturated liquid is not sufficiently humidified near the wall of the absorbent 1. That is, as shown in FIG. 4 which is a conceptual diagram of the distribution of the jetting of the absorbing liquid from the nozzles in the absorption tower 1, the absorbing liquid jetted from the nozzle 6'denoted by a black circle spreads as shown by the line 2 '. However, the spread of the absorbing liquid ejected from the nozzle 6'in the central portion of the absorption tower 1 is sufficient because there is a portion where the ranges of the spreading of the absorbing liquid ejected from the nozzles 6'adjacent to each other overlap. Are distributed in. However, the absorption liquid is not dispersed at all in the portion indicated by hatching c on the inner wall portion of the absorption tower 1,
For this reason, the ventilation pressure loss of the exhaust gas is also reduced in this portion, and the exhaust gas becomes an environment in which the exhaust gas flows more easily than the central portion due to absorption or the like. In this way, the amount of ejected liquid is small near the inner wall of the absorption tower, and the exhaust gas that has not been humidified is more likely to flow than the inside of the absorption tower. Therefore, scaling is performed at parts b and a in FIG. It was seen.
本発明は、上記の欠点を解消しようとするものであり、
吸収塔内壁を吸収液で充分濡れるようにすると共に、吸
収塔の内壁寄りでの排ガスの通気量が増加することを抑
制しようとするものである。The present invention is intended to solve the above drawbacks,
The present invention aims to sufficiently wet the inner wall of the absorption tower with the absorbing liquid and to suppress an increase in the amount of ventilation of exhaust gas near the inner wall of the absorption tower.
本発明は、亜硫酸ガスを含有する水分が未飽和な排ガス
を気液並流式吸収塔の塔頂部より導入し、複数のノズル
からカルシウム化合物を含有する吸収液を噴出させて上
記排ガスと吸収液とを気液接触処理して排煙脱硫するに
当って、上記吸収液と上記排ガスの気液接触開始部分の
吸収塔の断面積を拡巾したことを特徴とする。The present invention, the moisture-containing unsaturated gas containing sulfurous acid gas is introduced from the top of the gas-liquid co-current absorption tower, and the absorbent containing a calcium compound is ejected from a plurality of nozzles to discharge the exhaust gas and the absorbent. In the flue gas desulfurization by subjecting and to the gas-liquid contact treatment, the cross-sectional area of the absorption tower at the gas-liquid contact start portion of the absorbing liquid and the exhaust gas is expanded.
本発明は上記のように気液接触開始部分の吸収塔の断面
積を拡巾しているために、この拡巾した部分にもノズル
を設けることが可能になり、吸収塔の内壁よりの部分に
もノズルから噴出された収収液が分散されて気液の接触
が行なわれる。また上記内壁よりの部分に吸収液を噴出
されることによって、この部分の通気圧力損失は低下せ
ず、排ガスが内壁寄りの部分を多く流れることがない。Since the present invention widens the cross-sectional area of the absorption tower at the gas-liquid contact start portion as described above, it is possible to provide a nozzle in this widened portion as well. Also, the collected liquid collected from the nozzle is dispersed and the gas and liquid come into contact with each other. Further, since the absorbing liquid is ejected to the portion from the inner wall, the ventilation pressure loss in this portion does not decrease, and the exhaust gas does not flow much in the portion near the inner wall.
このように、排ガスは吸収塔内の全域において充分に吸
収液と気液接触して増湿され、吸収塔の断面にわたって
均一な量で流れることになり、吸収塔内壁面及び下流側
の充填物におけるカルシウム化合物のスケールの発生が
防がれる。In this way, the exhaust gas is sufficiently vapor-liquid contacted with the absorbing liquid to be humidified in the entire area of the absorption tower, and flows in a uniform amount over the cross section of the absorbing tower. It is possible to prevent the scale of calcium compounds from being generated.
本発明の一実施例を第１図に基づいて説明する。 An embodiment of the present invention will be described with reference to FIG.
本実施例では、SO2を含んだ水分未飽和の排ガス３を塔
頂より導入する吸収塔１には、複数個設けられた母管７
の各々に複数取付けたノズル６からカルシウム化合物を
含有する吸収液２を前記排ガス３の流れに対向して上方
に噴出させるが、記吸収液２の噴出部分の吸収塔１は、
ノズル６から噴出している吸収液２の噴出高さ程度の位
置ｉの部分から母管７の下の位置ｊに互って断面積を拡
巾５させると共にこの拡巾部分にも吸収液２の噴出ノズ
ル６を配設する。これによって吸収塔１内で排ガス３が
吸収液２と気液接触させるに当って、上記母管７の下の
位置ｊ以下の吸収塔１の内壁寄りでの吸収液２の噴出量
が少なくなることが解消されると共に、前記拡巾部５に
も吸収液２の噴出ノズル６を配したことによって排ガス
３が吸収塔１の内壁寄りに偏よって流れることが防止さ
れる。In the present embodiment, a plurality of mother tubes 7 are provided in the absorption tower 1 into which the moisture-unsaturated exhaust gas 3 containing SO 2 is introduced from the top.
The plurality of nozzles 6 attached to each of the above-mentioned means ejects the absorbing liquid 2 containing the calcium compound upwards in opposition to the flow of the exhaust gas 3, and the absorbing tower 1 at the ejecting portion of the absorbing liquid 2 is
The cross-sectional area is widened 5 from a position i, which is about the ejection height of the absorbing liquid 2 ejected from the nozzle 6, to a position j below the mother tube 7, and the absorbing liquid 2 also extends to this widening part. The ejection nozzle 6 is disposed. As a result, when the exhaust gas 3 comes into gas-liquid contact with the absorbing liquid 2 in the absorbing tower 1, the amount of jetting of the absorbing liquid 2 near the inner wall of the absorbing tower 1 below the above-mentioned mother pipe 7 is reduced. In addition to that, the exhaust gas 3 is prevented from flowing toward the inner wall of the absorption tower 1 due to the fact that the jet nozzle 6 for ejecting the absorbing liquid 2 is arranged in the widening portion 5 as well.
即ち、第１図における拡巾部５でのノズル６からの噴出
液量の分布状況を示す第２図において、母管中心線７′
上の各ノズル６′から噴出された吸収液は環状２′に拡
がり、第１図のｊ部での吸収塔の断面Ｊ′に対応する部
分及び拡巾部５で拡巾された吸収塔の断面５′の範囲内
にもノズル６′を配したことによって、これらのノズル
６から噴出される吸収液の抵抗によって拡巾の拡巾され
た部分５′に排ガスが偏よって多量流れることを防止す
るとともに、この部分５′で噴出させた吸収液は第１図
の吸収塔１の拡巾部分５から縮少されたｊの部分で集め
られ、ｊ位置以下の吸収塔の壁寄りに流れることとな
る。That is, in FIG. 2, which shows the distribution of the amount of liquid ejected from the nozzle 6 in the widened portion 5 in FIG.
The absorbing liquid ejected from each of the upper nozzles 6'spreads into an annular shape 2 ', and the portion corresponding to the cross section J'of the absorbing tower at j in FIG. By arranging the nozzles 6 ′ within the range of the cross section 5 ′, it is possible to prevent a large amount of exhaust gas from flowing unbalancedly in the widened portion 5 ′ due to the resistance of the absorbing liquid ejected from these nozzles 6. At the same time, the absorbing liquid ejected at this portion 5'is collected at the reduced j portion from the widening portion 5 of the absorption tower 1 in FIG. 1 and flows toward the wall of the absorption tower below the j position. Becomes
以上のように、本実施例では、吸収塔１の内壁よりに排
ガスの流れやすい部分が発生することが防止され、か
つ、この部分を通る排ガスは吸収液３に充分に気液接触
してこれを増湿させ、後流側の吸収塔１の内壁及び充填
層４にカルシウム化合物のスケールが発生することが防
止される。As described above, in the present embodiment, the generation of the portion where the exhaust gas easily flows from the inner wall of the absorption tower 1 is prevented, and the exhaust gas passing through this portion is sufficiently gas-liquid contacted with the absorbing liquid 3 To prevent the scale of the calcium compound from being generated on the inner wall of the absorption tower 1 and the packed bed 4 on the downstream side.
（実験例） 第１図に示した吸収塔の構造をもち、且つ第２図に示し
たような吸収液噴出ノズルの配設を施した装置を用い
て、SO2760ppmを含み温度が126℃で水分を7.9％を含ん
だ石炭燃焼排ガス20,000m3N/Hrを処理した。本実施例で
は、第１図の拡巾部の断面は1.2m正方形とし、第１図の
ｊ部での断面は1m正方形として吸収塔を用い、また、吸
収塔の拡巾部の始まりであるｉ部からｊ部までの高さは
1mとし、該拡巾部の上部のｉ部からの拡がり角度は45度
とし又ｊ部迄の絞り角も45゜とした。この該拡幅部に40
Aのノズル６本を0.2m間隔で上向きに設けた80Aの母管を
６本0.2m間隔で取付けた。また各母管における１番目の
ノズルと６番目のノズルは拡巾部吸収塔の壁から0.1m離
して設置した。同様に両端の母管も拡巾部吸収塔の壁面
から0.1m離して設置した。また、充填物は2mのものを３
段設けた。この仕様の吸収塔を用いて流量300m3/HrのCa
CO3を含む吸収液を噴射SO2の吸収剤として吸収したSO2
のほぼ当量のCaCO3粉沫を供給して脱硫運転を約700時間
実施した後吸収塔の開放点検を実施した。その結果吸収
塔内壁及び充填物にはスケールの発生はなかった。(Experimental Example) Using an apparatus having the structure of the absorption tower shown in FIG. 1 and provided with the absorbent jet nozzle as shown in FIG. 2 , the temperature is 126 ° C. including 760 ppm of SO 2 20,000m 3 N / Hr of coal combustion exhaust gas containing 7.9% of water was treated with. In the present embodiment, the cross section of the widening part of FIG. 1 is 1.2 m square, the cross section at j part of FIG. 1 is 1 m square, the absorption tower is used, and the widening part of the absorption tower starts. The height from part i to part j is
The divergence angle from the part i at the top of the widening part was 45 degrees, and the drawing angle up to the part j was also 45 °. 40 in this widened part
Six 80A mother tubes with six A nozzles installed 0.2m apart were installed at six 0.2m intervals. Further, the first nozzle and the sixth nozzle in each mother tube were installed at a distance of 0.1 m from the wall of the widening section absorption tower. Similarly, the mother tubes at both ends were also installed at a distance of 0.1 m from the wall of the expansion tower. Also, the packing should be 3m if it is 2m.
A step is provided. Using an absorption tower of this specification, a Ca flow rate of 300 m 3 / Hr
SO 2 absorbed by absorbing liquid containing CO 3 as an absorbent of injected SO 2
After approximately 700 hours of desulfurization operation was performed by supplying CaCO 3 powder of about the same amount, the absorption tower was opened and inspected. As a result, no scale was generated on the inner wall of the absorption tower and the packing.
（比較例） 実施例と同じ排ガス20000m3N/Hrを、第３図の態様をな
す吸収塔で処理した。吸収塔の断面は1m正方形であり、
母管は100Aのものを５本用い0.2m間隔で取付け、又各母
管には40Aのノズル５本を0.2m間隔で取付けた。５本の
母管の両端の母管は吸収塔内壁より各々0.1mずつ離して
設置した。各母管の１番目と５番目のノズルは吸収塔壁
より0.1m離して設置した。この仕様の吸収塔を用いて30
0m3/Hrの吸収液を噴射し、実験例と同様吸収剤としてCa
CO3を用いて約700時間運転後開放点検を実施した結果、
第１図のｂ部に２〜15mmの厚みのスケールがみられ、ま
た、充填物についても吸収塔壁から50mm程度の幅のスケ
ールが吸収塔内壁周囲の充填物に発生しており、充填物
の高さ方向については、充填高さ2mのものを３段用いた
が各段とも多少の差異はあったもののスケールの発生を
確認した。また充填物については母管に近いもの程厚み
の厚いスケールが発生した。(Comparative Example) The same exhaust gas 20000 m 3 N / Hr as in the example was treated in the absorption tower having the embodiment shown in FIG. The cross section of the absorption tower is a 1m square,
Five 100 A nozzles were used at 0.2 m intervals, and five 40 A nozzles were installed at 0.2 m intervals on each mother tube. The mother tubes at both ends of the five mother tubes were installed at a distance of 0.1 m from the inner wall of the absorption tower. The first and fifth nozzles of each mother tube were installed at a distance of 0.1 m from the absorption tower wall. 30 with an absorption tower of this specification
Spray 0 m 3 / Hr of absorbing liquid, and use Ca as an absorbent as in the experimental example.
As a result of conducting an open inspection after operating for about 700 hours using CO 3 ,
A scale with a thickness of 2 to 15 mm is seen in part b of Fig. 1, and a scale with a width of about 50 mm from the absorption tower wall also occurs in the packing around the inner wall of the absorption tower. As for the height direction, 3 stages with a filling height of 2 m were used, but the generation of scale was confirmed although there were some differences in each stage. As for the packing, a thicker scale was generated closer to the mother tube.
本発明は、以上説明したように、吸収塔内で水分未飽和
な排ガスを複数のノズルから噴出されたカルシウム化合
物を含む吸収液と気液接触させ湿式脱硫するに当って、
上記排ガスと上記吸収液との気液接触開始部分の吸収塔
断面積を拡巾することによって、気液接触開始後の吸収
塔の内壁寄り部分での排ガスの偏った流れを抑制すると
共に吸収塔内壁寄りでの吸収液の噴出量を充分に確保で
き、これにより、吸収塔内でのスケール発生を防止する
ことができる。The present invention, as described above, in wet desulfurization in gas-liquid contact with the absorbent liquid containing the calcium compound ejected from the moisture unsaturated gas in the absorption tower,
By widening the absorption tower cross-sectional area of the gas-liquid contact start portion between the exhaust gas and the absorption liquid, while suppressing the uneven flow of the exhaust gas in the inner wall side portion of the absorption tower after the start of gas-liquid contact and the absorption tower It is possible to sufficiently secure the ejection amount of the absorbing liquid near the inner wall, and thus it is possible to prevent scale generation in the absorption tower.
第１図は本発明の一実施例を示す概念図、第２図は同実
施例における吸収液の分布状況を示す説明図、第３図は
従来例を示す概念図、第４図は従来例における吸収液の
分布状況を示す説明図である。 １……吸収塔,2……吸収液,3……排ガス,4……充填物,5
……拡巾部,6……ノズル,7……母管,7′……母管中心
線。FIG. 1 is a conceptual diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the distribution of absorbing liquid in the same embodiment, FIG. 3 is a conceptual diagram showing a conventional example, and FIG. 4 is a conventional example. FIG. 5 is an explanatory diagram showing a distribution state of the absorbing liquid in FIG. 1 ... Absorption tower, 2 ... Absorption liquid, 3 ... Exhaust gas, 4 ... Packing material, 5
…… Widening part, 6 …… Nozzle, 7 …… Mother tube, 7 ′ …… Mother tube center line.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/77 Ｂ０１Ｄ 53/34 ＺＡＢ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display B01D 53/77 B01D 53/34 ZAB
Claims (1)
スを気液並流式吸収塔の塔頂部より導入し、複数のノズ
ルからカルシウム化合物を含有する吸収液を噴出させ、
上記排ガスと吸収液とを気液接触処理して排煙脱硫する
脱硫方法において、上記吸収液と上記排ガスの気液接触
開始部分の吸収塔断面積を拡巾したことを特徴とする排
ガスの脱硫方法。1. An exhaust gas containing sulfurous acid and having an unsaturated water content is introduced from the top of a gas-liquid co-current absorption tower, and an absorbent containing a calcium compound is ejected from a plurality of nozzles.
In the desulfurization method of subjecting the exhaust gas and the absorbent to gas-liquid contact treatment for flue gas desulfurization, the desulfurization of exhaust gas is characterized in that the absorption tower cross-sectional area of the gas-liquid contact start portion of the absorbent and the exhaust gas is expanded. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63084106A JPH0773658B2 (en) | 1988-04-07 | 1988-04-07 | Exhaust gas desulfurization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63084106A JPH0773658B2 (en) | 1988-04-07 | 1988-04-07 | Exhaust gas desulfurization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01258729A JPH01258729A (en) | 1989-10-16 |
| JPH0773658B2 true JPH0773658B2 (en) | 1995-08-09 |
Family
ID=13821269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63084106A Expired - Fee Related JPH0773658B2 (en) | 1988-04-07 | 1988-04-07 | Exhaust gas desulfurization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0773658B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5289668B2 (en) * | 2005-05-18 | 2013-09-11 | バブコック日立株式会社 | Wet flue gas desulfurization equipment |
| JP5693076B2 (en) | 2010-07-29 | 2015-04-01 | 三菱重工業株式会社 | Gas-liquid contact device and CO2 recovery device |
| JP6679548B2 (en) | 2017-09-20 | 2020-04-15 | 三菱日立パワーシステムズ株式会社 | Desulfurization equipment |
-
1988
- 1988-04-07 JP JP63084106A patent/JPH0773658B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01258729A (en) | 1989-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |