JP2796429B2 - Combustion gas desulfurization method and apparatus - Google Patents
Combustion gas desulfurization method and apparatusInfo
- Publication number
- JP2796429B2 JP2796429B2 JP2322424A JP32242490A JP2796429B2 JP 2796429 B2 JP2796429 B2 JP 2796429B2 JP 2322424 A JP2322424 A JP 2322424A JP 32242490 A JP32242490 A JP 32242490A JP 2796429 B2 JP2796429 B2 JP 2796429B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion gas
- desulfurization
- flue
- combustion
- furnace
- 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
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- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、専業用又は産業用ボイラ等の燃焼ガスの脱
硫方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for desulfurizing a combustion gas for a specialized or industrial boiler or the like.
従来のボイラ等の燃焼炉の燃焼ガスの脱硫方法を第３
図に示す。The third method of desulfurizing the combustion gas of a combustion furnace such as a boiler is
Shown in the figure.
燃焼炉10に微粉炭11及び石灰石（CaCO3）12が供給さ
れ、炉内脱硫が行なわれる。燃焼炉10出口の燃焼ガス中
のSOx分は、スラリ21を噴霧する脱硫煙道20で、さらに
脱硫される。このスラリ21は、脱硫煙道20を出た燃焼ガ
スから電気集じん機（EP）30で回収したフライアッシュ
の一部31と水32を混合機40で混合してつくられる。Pulverized coal 11 and limestone (CaCO 3 ) 12 are supplied to a combustion furnace 10 to perform in-furnace desulfurization. The SO x content in the combustion gas at the outlet of the combustion furnace 10 is further desulfurized in a desulfurization flue 20 for spraying a slurry 21. The slurry 21 is produced by mixing a part 31 of fly ash collected by an electric precipitator (EP) 30 from the combustion gas exiting the desulfurization flue 20 with water 32 in a mixer 40.
電気集じん機30で回収されたフライアッシュと水とが
混合されたスラリ21中には、前記燃焼炉10で供給された
石灰石によってCa(OH)2が含まれており、次の反応によ
って、スラリ21によって脱硫煙道20内の燃焼ガスの脱硫
が行なわれる。In the slurry 21 in which fly ash and water collected by the electrostatic precipitator 30 are mixed, Ca (OH) 2 is contained by the limestone supplied in the combustion furnace 10, and by the following reaction, The combustion gas in the desulfurization flue 20 is desulfurized by the slurry 21.
この従来の脱硫方法では、電気集じん機30を安定して
運転するために、脱硫煙道20入口及び出口のガス温度
は、飽和温度より充分高い温度に設定される。 In this conventional desulfurization method, the gas temperature at the inlet and outlet of the desulfurization flue 20 is set to a temperature sufficiently higher than the saturation temperature in order to operate the electric precipitator 30 stably.
電気集じん機30で回収されたフライアッシュの残部33
は、EP灰として所定の処理が行なわれる。また、電気集
じん機30でフライアッシュ等のダストを除去されたガス
は煙突50から大気へ放出される。Remains 33 of fly ash collected by electric precipitator 30
Is subjected to predetermined processing as EP ash. The gas from which dust such as fly ash has been removed by the electric precipitator 30 is discharged from the chimney 50 to the atmosphere.
前記従来の脱硫方法では、脱硫煙道20での脱硫率が悪
い。ここでの脱硫は、第２図に示すように、ガス温度が
低い程効果は大きい。In the conventional desulfurization method, the desulfurization rate in the desulfurization flue 20 is poor. The effect of desulfurization here is greater as the gas temperature is lower, as shown in FIG.
なお、第２図中線(Ca/S)1は、線(Ca/S)2に比して未反
応CaOが多量に存在する場合を示す。The line (Ca / S) 1 in FIG. 2 shows a case where a large amount of unreacted CaO is present as compared with the line (Ca / S) 2 .
しかし、次工程の電気集じん機30での安定運転を考慮
すると、水分によるベタツキ等の不具合を避けるため
に、ガス温度を大きく低下できず、従って、脱硫煙道20
での脱硫率を高めることができなかった。However, in consideration of the stable operation of the electric precipitator 30 in the next process, the gas temperature cannot be significantly reduced in order to avoid problems such as stickiness due to moisture.
Could not increase the desulfurization rate.
本発明は、従来の燃焼ガスの脱硫方法の前記問題点を
解決しようとするものである。SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the conventional combustion gas desulfurization method.
本発明は、燃焼炉内に石灰石を投入して炉内脱硫を行
ない、電気集じん機で回収した燃焼ガス中のフライアッ
シュをスラリ化して前記燃焼炉から出る燃焼ガスの煙道
に噴霧して脱硫を行なう燃焼ガスの脱硫方法において、
前記煙道のフライアッシュのスラリの噴霧点の上流側の
前記煙道において、煙道内の燃焼ガスとフライアッシュ
のスラリを噴霧して脱硫を行なった燃焼ガスとの間に熱
交換を行ない煙道中の燃焼ガス温度を飽和温度近くまで
低下させることを特徴とする。According to the present invention, limestone is charged into a combustion furnace to perform in-furnace desulfurization, and fly ash in combustion gas collected by an electric dust collector is slurried and sprayed into a flue of combustion gas exiting the combustion furnace. In a desulfurization method of a combustion gas for performing desulfurization,
In the flue upstream of the spray point of the fly ash slurry in the flue, heat exchange is performed between the combustion gas in the flue and the combustion gas sprayed with the fly ash slurry to perform desulfurization. Is characterized by lowering the temperature of the combustion gas to near the saturation temperature.
また本発明は、石灰石を投入して炉内脱硫を行なう燃
焼炉、前記燃焼炉の燃焼ガス中のフライアッシュを回収
する電気集じん機、前記電気集じん機で回収したフライ
アッシュをスラリ化する混合機、及び前記燃焼炉と前記
燃焼炉との間に設けられ前記燃焼炉から出た燃焼ガス中
に前記混合機でつくられたスラリが噴霧される煙道を備
えた燃焼ガスの脱硫装置において、前記煙道のフライア
ッシュのスラリの噴霧点の上流側に煙道内の燃焼ガスと
フライアッシュのスラリを噴霧して脱硫が行なわれた燃
焼ガスとの間に熱交換を行なう熱交換器を設けたことを
特徴とする。Further, the present invention provides a combustion furnace for performing in-furnace desulfurization by charging limestone, an electric precipitator for collecting fly ash in combustion gas of the combustion furnace, and slurrying fly ash collected by the electric precipitator. A combustion gas desulfurization apparatus comprising: a mixer; and a flue provided between the combustion furnace and the combustion furnace, wherein a flue generated by the mixer is sprayed into combustion gas discharged from the combustion furnace. A heat exchanger for performing heat exchange between the combustion gas in the flue and the combustion gas that has been desulfurized by spraying the fly ash slurry is provided upstream of the spray point of the fly ash slurry in the flue. It is characterized by having.
燃焼炉に石灰石を投入して炉内脱硫を行ない、燃焼ガ
ス中のフライアッシュを電気集じん機で回収してこれを
スラリ化して、同電気集じん機の上流の燃焼ガスの煙道
に噴霧してスラリ中のCa(OH)2による脱硫を行なう場合
には、前記したように、スラリが噴霧される燃焼ガスの
温度が低い程脱硫率が高くなり、炉内脱硫と組合わせた
全体の脱硫率が向上する。Limestone is charged into the combustion furnace to perform in-furnace desulfurization, fly ash in the combustion gas is collected by an electric precipitator, turned into a slurry, and sprayed into the flue of the combustion gas upstream of the electric precipitator. When performing desulfurization with Ca (OH) 2 in the slurry, as described above, the desulfurization rate increases as the temperature of the combustion gas to which the slurry is sprayed is lower, and the overall desulfurization combined with furnace desulfurization is performed. The desulfurization rate is improved.
本発明では、煙道内でスラリが噴霧されて脱硫が行な
われて温度が低下した燃焼ガスを、スラリの噴霧点の上
流側の煙道において煙道内の燃焼ガスと熱交換させて燃
焼ガス温度を飽和温度近くまで低下させることによっ
て、スラリの噴霧による脱硫率が向上する。In the present invention, the combustion gas whose temperature has been reduced by spraying the slurry in the flue and being desulfurized is exchanged with the combustion gas in the flue in the flue upstream of the spraying point of the slurry to reduce the combustion gas temperature. By decreasing the temperature to near the saturation temperature, the desulfurization rate by spraying the slurry is improved.
また、スラリが噴霧されて脱硫が行なわれた燃焼ガス
は、前記のように煙道内の燃焼ガスと熱交換を行なって
温度が上昇した上電気集じん機に供給されるために、電
気集じん機は安定した運転が行なわれる。Further, the combustion gas subjected to desulfurization by spraying the slurry is subjected to heat exchange with the combustion gas in the flue as described above, and is supplied to the electric precipitator whose temperature has increased. The machine operates stably.
本発明の一実施例を、第１図によって説明する。 One embodiment of the present invention will be described with reference to FIG.
本実施例は、第３図に示す燃焼炉の燃焼ガスの脱硫方
法において、以下説明する点を付加したものであり、第
１図において対応する部分には第３図における同一の符
号を付し、その説明を省略する。In the present embodiment, the points described below are added to the method for desulfurizing the combustion gas of the combustion furnace shown in FIG. 3, and the corresponding parts in FIG. 1 are denoted by the same reference numerals in FIG. , The description of which is omitted.
本実施例では、燃焼炉10から脱硫煙道20へ燃焼ガスを
導く煙道35に、ガス／ガスヒータ60を設置し、同ガス／
ガスヒータ60には、スラリ21が噴射されて脱硫が行なわ
れた脱硫煙道20を出る燃焼ガスを導入し、同ガス／ガス
ヒータ60を通過した同ガスを電気集じん機30へ供給する
ようになっている。In the present embodiment, a gas / gas heater 60 is installed in the flue 35 that guides the combustion gas from the combustion furnace 10 to the desulfurization flue 20,
The gas heater 60 is supplied with a combustion gas that exits the desulfurization flue 20 into which the slurry 21 has been injected and desulfurized, and supplies the same gas / gas passing through the gas heater 60 to the electric precipitator 30. ing.
本実施例では、脱硫煙道20でスラリ21が噴霧され温度
が低下した脱硫後の燃焼ガスがガス／ガスヒータ60に導
かれ、ここで燃焼炉10を出た燃焼ガスと熱交換してその
温度を飽和温度近くまで低下させる。このように燃焼炉
10を出た燃焼ガスは、その温度が飽和温度近くまで低下
した上、脱硫煙道20へ入ってスラリ21による脱硫作用を
受けるために、第２図に示すように脱硫率が向上する。In this embodiment, the desulfurized flue gas from which the slurry 21 is sprayed in the desulfurization flue 20 is led to the gas / gas heater 60 where the temperature of the combustion gas is reduced. To near saturation temperature. Thus the combustion furnace
The temperature of the combustion gas that has exited 10 drops to near the saturation temperature, and then enters the desulfurization flue 20 and is subjected to the desulfurization action of the slurry 21, so that the desulfurization rate is improved as shown in FIG.
また、脱硫煙道20を出た脱硫後の燃焼ガスは、ガス／
ガスヒータ60において燃焼炉10を出た温度の高い燃焼ガ
スと熱交換してその温度が高められた上、電気集じん機
30に供給されるために、電気集じん機30の安定した運転
を行なうことができる。The combustion gas after desulfurization that has exited the desulfurization flue 20 is gas /
The gas heater 60 exchanges heat with the high-temperature combustion gas exiting the combustion furnace 10 to increase its temperature, and furthermore, an electric precipitator.
Since the electric dust collector 30 is supplied, the electric dust collector 30 can be operated stably.
第１図に示された方法による本発明と第３図に示され
る従来の方法とを比較試験した結果を、第１表に示す。Table 1 shows the results of a comparison test between the present invention according to the method shown in FIG. 1 and the conventional method shown in FIG.
石炭：三池炭 供給CaCO3:Ca/Sモル比2.0 以上の通り、本発明においては、従来の脱硫方法に比
して、全体の脱硫率が著しく向上することが確認され
た。 Coal: Miike coal Supply CaCO 3 : Ca / S molar ratio 2.0 As described above, in the present invention, it was confirmed that the overall desulfurization rate was significantly improved as compared with the conventional desulfurization method.
以上説明したように、本発明では、石灰石による炉内
脱硫を行なう燃焼炉から出る燃焼ガスの温度を飽和温度
近くの非常に低温にした上、電気集じん機で回収した燃
焼ガス中のフライアッシュのスラリを前記低温の燃焼ガ
スに噴霧することによって、脱硫率を上げることがで
き、従って、炉内脱硫と組合せた全体の脱硫率を非常に
高くすることができる。As described above, in the present invention, the temperature of the combustion gas discharged from the combustion furnace for performing in-furnace desulfurization using limestone is set to a very low temperature near the saturation temperature, and fly ash in the combustion gas collected by the electric dust collector is used. By spraying the slurry on the low-temperature combustion gas, the desulfurization rate can be increased, and therefore, the overall desulfurization rate combined with the furnace desulfurization can be extremely increased.
また、フライアッシュのスラリによる脱硫後の燃焼ガ
スは、燃焼炉を出る高温の燃焼ガスと熱交換を行なって
昇温された上電気集じん機に供給されるために、電気集
じん機を安定して運転することができる。In addition, the combustion gas after desulfurization by the fly ash slurry exchanges heat with the high-temperature combustion gas that exits the combustion furnace, and is supplied to the heated electric precipitator, which stabilizes the electric precipitator. You can drive.
第１図は本発明の一実施例の系統図，第２図は脱硫煙道
における燃焼ガス温度と煙道脱硫効率の関係を示すグラ
フ，第３図は従来の燃焼ガスの脱硫方法の系統図であ
る。 10……燃焼炉,11……微粉炭,12……石灰石,20……脱硫
煙道,12……石灰石,20……脱硫煙道,21……スラリ,30…
…電気集じん機,40……混合機,50……煙突,60……ガス
／ガスヒータ。1 is a system diagram of one embodiment of the present invention, FIG. 2 is a graph showing a relationship between a combustion gas temperature and a flue gas desulfurization efficiency in a desulfurization flue, and FIG. 3 is a system diagram of a conventional combustion gas desulfurization method. It is. 10 combustion furnace, 11 pulverized coal, 12 limestone, 20 desulfurization flue, 12 limestone, 20 desulfurization flue, 21 slurry, 30
... Electric dust collector, 40 ... Mixer, 50 ... Chimney, 60 ... Gas / gas heater.
Claims (2)
ない、電気集じん機で回収した燃焼ガス中のフライアッ
シュをスラリ化して前記燃焼炉から出る燃焼ガスの煙道
に噴霧して脱硫を行なう燃焼ガスの脱硫方法において、
前記煙道のフライアッシュのスラリの噴霧点の上流側の
前記煙道において、煙道内の燃焼ガスとフライアッシュ
のスラリを噴霧して脱硫が行なわれた燃焼ガスとの間に
熱交換を行ない煙道中の燃焼ガス温度を飽和温度近くま
で低下させることを特徴とする燃焼ガスの脱硫方法。A limestone is charged into a combustion furnace to perform desulfurization in the furnace, and fly ash in the combustion gas collected by an electric dust collector is slurried and sprayed into a flue of the combustion gas discharged from the combustion furnace. In the desulfurization method of combustion gas to perform desulfurization by
In the flue upstream of the spray point of the fly ash slurry in the flue, heat exchange is performed between the combustion gas in the flue and the combustion gas that has been subjected to desulfurization by spraying the fly ash slurry. A method for desulfurizing a combustion gas, comprising reducing the temperature of a combustion gas in a road to near a saturation temperature.
炉、前記燃焼炉の燃焼ガス中のフライアッシュを回収す
る電気集じん機、前記電気集じん機で回収したフライア
ッシュをスラリ化する混合機、及び前記燃焼炉と前記燃
焼炉との間に設けられ前記燃焼炉から出た燃焼ガス中に
前記混合機でつくられたスラリが噴霧される煙道を備え
た燃焼ガスの脱硫装置において、前記煙道のフライアッ
シュのスラリの噴霧点の上流側に煙道内の燃焼ガスとフ
ライアッシュのスラリを噴霧して脱硫が行なわれた燃焼
ガスとの間に熱交換を行なう熱交換器を設けたことを特
徴とする燃焼ガスの脱硫装置。2. A combustion furnace in which limestone is charged to perform in-furnace desulfurization, an electric precipitator for collecting fly ash in the combustion gas of the combustion furnace, and a fly ash collected by the electric precipitator being slurried. A combustion gas desulfurization apparatus comprising: a mixer; and a flue provided between the combustion furnace and the combustion furnace, wherein a flue generated by the mixer is sprayed into combustion gas discharged from the combustion furnace. A heat exchanger for performing heat exchange between the combustion gas in the flue and the combustion gas that has been desulfurized by spraying the fly ash slurry is provided upstream of the spray point of the fly ash slurry in the flue. A desulfurization device for combustion gas, characterized in that:
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2322424A JP2796429B2 (en) | 1990-11-28 | 1990-11-28 | Combustion gas desulfurization method and apparatus |
| AT91120292T ATE148367T1 (en) | 1990-11-28 | 1991-11-27 | DEVICE FOR DESULPHURIZING EXHAUST GAS |
| EP91120292A EP0492167B1 (en) | 1990-11-28 | 1991-11-27 | Apparatus for desulfurizing exhaust gas |
| EP94114112A EP0628340B1 (en) | 1990-11-28 | 1991-11-27 | Method for desulfurizing exhaust gas |
| AT94114112T ATE144722T1 (en) | 1990-11-28 | 1991-11-27 | METHOD FOR DESULPHURIZING EXHAUST GAS |
| DE69124496T DE69124496T2 (en) | 1990-11-28 | 1991-11-27 | Exhaust gas desulfurization device |
| DE69122974T DE69122974T2 (en) | 1990-11-28 | 1991-11-27 | Process for desulfurizing exhaust gas |
| CN91111184A CN1039677C (en) | 1990-11-28 | 1991-11-27 | Process and unit for desulfuration of flue gases |
| PL29257391A PL292573A1 (en) | 1990-11-28 | 1991-11-28 | Method of desulfurizing combustion gases and apparatus therefor |
| CN96107404A CN1075744C (en) | 1990-11-28 | 1996-05-16 | Exhaust sweetener |
| CN96107407A CN1081941C (en) | 1990-11-28 | 1996-05-16 | Exhaust sweetener |
| CN96107405A CN1081940C (en) | 1990-11-28 | 1996-05-16 | Exhaust sweetening method |
| CN96107406A CN1086596C (en) | 1990-11-28 | 1996-05-16 | Exhaust desulfation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2322424A JP2796429B2 (en) | 1990-11-28 | 1990-11-28 | Combustion gas desulfurization method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04193325A JPH04193325A (en) | 1992-07-13 |
| JP2796429B2 true JP2796429B2 (en) | 1998-09-10 |
Family
ID=18143510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2322424A Expired - Fee Related JP2796429B2 (en) | 1990-11-28 | 1990-11-28 | Combustion gas desulfurization method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2796429B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4920993B2 (en) * | 2005-04-26 | 2012-04-18 | 三菱重工メカトロシステムズ株式会社 | Exhaust gas treatment apparatus and exhaust gas treatment method |
| CN114887765B (en) * | 2022-06-16 | 2022-10-04 | 浙江安达环保设备有限公司 | Novel high-temperature electrostatic dust collector |
-
1990
- 1990-11-28 JP JP2322424A patent/JP2796429B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04193325A (en) | 1992-07-13 |
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