JP2010234322A - Exhaust gas purification method and exhaust gas purification apparatus - Google Patents
Exhaust gas purification method and exhaust gas purification apparatus Download PDFInfo
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- JP2010234322A JP2010234322A JP2009087069A JP2009087069A JP2010234322A JP 2010234322 A JP2010234322 A JP 2010234322A JP 2009087069 A JP2009087069 A JP 2009087069A JP 2009087069 A JP2009087069 A JP 2009087069A JP 2010234322 A JP2010234322 A JP 2010234322A
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Abstract
Description
本発明は、排ガス浄化方法、及び排ガス浄化装置に関する。 The present invention relates to an exhaust gas purification method and an exhaust gas purification device.
ボイラ等から排出された排ガスには、塵が含まれている。そこで、このような排ガスから塵を除去するために、塵を含む排ガスを電気集塵器(EP:Electrostatic Precipitator)へ供給する技術が開発されている。 The exhaust gas discharged from the boiler or the like contains dust. Therefore, in order to remove dust from such exhaust gas, a technology for supplying exhaust gas containing dust to an electrostatic precipitator (EP) has been developed.
ところが、このような排ガスには、通常、塵のほかに三酸化硫黄(SO3)も含まれているため、その三酸化硫黄が水蒸気と反応して、排ガス中に硫酸蒸気が生成されることとなる。そして、排ガスの温度が硫酸の酸露点(130℃〜150℃)未満になると、排ガス中に生成した硫酸蒸気が結露し、結露した硫酸蒸気が伝熱面を腐食させたり、或いは、結露した硫酸蒸気が塵に付着して当該塵の電気抵抗が低下し、その結果、当該塵が帯電しにくくなって、電気集塵器(EP)による集塵が困難になるなどの問題が生じてしまう。 However, since such exhaust gas usually contains sulfur trioxide (SO 3 ) in addition to dust, the sulfur trioxide reacts with water vapor to generate sulfuric acid vapor in the exhaust gas. It becomes. When the temperature of the exhaust gas becomes lower than the acid dew point of sulfuric acid (130 ° C. to 150 ° C.), the sulfuric acid vapor generated in the exhaust gas is condensed, and the condensed sulfuric acid vapor corrodes the heat transfer surface or the condensed sulfuric acid. Steam adheres to the dust and the electric resistance of the dust is reduced. As a result, the dust is difficult to be charged, and problems such as difficulty in collecting dust by the electric dust collector (EP) occur.
そこで、従来より、エアヒータ(AH:air heater)を用いて排ガスを加熱し、その温度を酸露点以上にすることによって、硫酸蒸気が結露するのを防いだり、或いは、排ガスにアンモニア(NH3)を注入し、そのアンモニアにより排ガスに含まれる三酸化硫黄(SO3)を中和させて硫酸アンモニウムにした上で、電気集塵器(EP)によって、塵とともに硫酸アンモニウムを除去している(例えば、特許文献1参照)。 Therefore, conventionally, the exhaust gas is heated using an air heater (AH) and the temperature is set to the acid dew point or higher to prevent the sulfuric acid vapor from condensing or ammonia (NH 3 ) is added to the exhaust gas. And neutralizing sulfur trioxide (SO 3 ) contained in the exhaust gas with ammonia to make ammonium sulfate, and then using an electrostatic precipitator (EP) to remove ammonium sulfate together with dust (for example, patents) Reference 1).
しかしながら、従来の技術にあっては、排ガスの温度が酸露点未満の場合(硫酸蒸気が結露し、アンモニアの注入が効を奏する場合)のみならず、酸露点以上の場合(硫酸蒸気が結露せず、アンモニアを注入する必要がない場合)においても、排ガスにアンモニアを不必要に注入していたため、排ガスへのアンモニアの注入が非効率的であった。 However, in the conventional technology, not only when the temperature of the exhaust gas is lower than the acid dew point (when sulfuric acid vapor is condensed and ammonia injection is effective), but also when the temperature is above the acid dew point (when sulfuric acid vapor is condensed). Even in the case where it is not necessary to inject ammonia), ammonia was unnecessarily injected into the exhaust gas, so that the injection of ammonia into the exhaust gas was inefficient.
そこで、本発明は、排ガスへのアンモニアの注入を効率的に行うことができる排ガス浄化方法、及び排ガス浄化装置を提供することを目的とする。 Therefore, an object of the present invention is to provide an exhaust gas purification method and an exhaust gas purification device that can efficiently inject ammonia into exhaust gas.
上記課題を解決するために、本発明は、塵及び三酸化硫黄(SO3)が含まれる排ガスにアンモニアを注入し、当該アンモニアが注入された排ガスを電気集塵器へ供給することにより、前記排ガスから前記塵を除去して当該排ガスを浄化する排ガス浄化方法であって、
前記排ガスの温度を測定し、その測定温度が硫酸の酸露点未満の場合には、前記排ガスへの前記アンモニアの注入を継続する一方で、前記測定温度が前記酸露点以上の場合には、前記排ガスへの前記アンモニアの注入を停止することを特徴とする。
In order to solve the above-mentioned problem, the present invention injects ammonia into an exhaust gas containing dust and sulfur trioxide (SO 3 ), and supplies the exhaust gas into which the ammonia has been injected to an electric dust collector. An exhaust gas purification method for purifying the exhaust gas by removing the dust from the exhaust gas,
When the temperature of the exhaust gas is measured and the measurement temperature is lower than the acid dew point of sulfuric acid, the ammonia is continuously injected into the exhaust gas, while the measurement temperature is equal to or higher than the acid dew point, the The injection of the ammonia into the exhaust gas is stopped.
また、本発明の排ガス浄化装置は、電気集塵器と、前記電気集塵器へ塵及び三酸化硫黄が含まれる排ガスを供給する排ガス管と、前記排ガス管内を流れる前記排ガスにアンモニアを注入するアンモニア注入装置と、前記排ガス管内を流れる前記排ガスの温度を測定する排ガス温度測定器と、前記排ガス温度測定器によって測定された前記排ガスの測定温度が硫酸の酸露点未満の場合には、前記排ガスへの前記アンモニアの注入を継続する一方で、前記測定温度が前記酸露点以上の場合には、前記排ガスへの前記アンモニアの注入を停止するように前記アンモニア注入装置を制御する制御装置と、を有することを特徴とする。 The exhaust gas purifying apparatus of the present invention includes an electric dust collector, an exhaust gas pipe for supplying exhaust gas containing dust and sulfur trioxide to the electric dust collector, and injecting ammonia into the exhaust gas flowing through the exhaust gas pipe. An ammonia injection device, an exhaust gas temperature measuring device for measuring the temperature of the exhaust gas flowing in the exhaust gas pipe, and the exhaust gas when the measured temperature of the exhaust gas measured by the exhaust gas temperature measuring device is lower than the acid dew point of sulfuric acid. A control device for controlling the ammonia injection device so as to stop the injection of the ammonia into the exhaust gas when the measurement temperature is equal to or higher than the acid dew point. It is characterized by having.
本発明によれば、排ガスへのアンモニアの注入を効率的に行うことができる。 According to the present invention, ammonia can be efficiently injected into exhaust gas.
以下、図1を参照しながら、本発明の実施形態について説明する。図1は、本発明の実施形態に係る排ガス浄化装置を示す概略図である。 Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic view showing an exhaust gas purifying apparatus according to an embodiment of the present invention.
図1に示すように、排ガス浄化装置10は、電気集塵器1と、電気集塵器1へ塵及び三酸化硫黄(SO3)が含まれる排ガスを供給する排ガス管2と、排ガス管2内を流れる排ガスにアンモニア(NH3)を注入するアンモニア注入装置3と、排ガス管2内を流れる排ガスの温度を測定する排ガス温度測定器4と、アンモニア注入装置3を制御する制御装置5と、を有する。なお、排ガス管2の上流側には、排ガスを加熱するためのエアヒータ(AH)が設けられており、電気集塵器1へ供給する排ガスの温度を制御することが可能である。制御装置5は、アンモニア注入装置3を制御する装置であり、排ガス温度測定器4によって測定された排ガスの測定温度が硫酸の酸露点未満の場合には、排ガスへのアンモニアの注入を継続する一方で、測定温度が硫酸の酸露点以上の場合には、排ガスへの前記アンモニアの注入を停止するようにアンモニア注入装置3を制御する。
As shown in FIG. 1, the exhaust
このような排ガス浄化装置10にあっては、制御装置5によって、排ガスの温度が酸露点未満の場合(硫酸蒸気が結露し、アンモニアの注入が効を奏する場合)にのみ、排ガスにアンモニアを注入することとし、これとは逆に、排ガスの温度が酸露点以上の場合(硫酸蒸気が結露せず、アンモニアを注入する必要がない場合)には、排ガスにアンモニアを注入しないように制御されている。従って、排ガス浄化装置10にあっては、不必要なアンモニアの注入が抑制されるため、排ガスへのアンモニアの注入が効率的になる。
In such an exhaust
1 電気集塵器
2 排ガス管
3 アンモニア注入装置
4 排ガス温度測定器
5 制御装置
6 エアヒータ(AH)
10 排ガス浄化装置
DESCRIPTION OF SYMBOLS 1 Electric dust collector 2 Exhaust gas pipe 3 Ammonia injection device 4 Exhaust gas
10 Exhaust gas purification device
Claims (2)
前記排ガスの温度を測定し、その測定温度が硫酸の酸露点未満の場合には、前記排ガスへの前記アンモニアの注入を継続する一方で、前記測定温度が前記酸露点以上の場合には、前記排ガスへの前記アンモニアの注入を停止することを特徴とする排ガス浄化方法。 Purify the exhaust gas by removing the dust from the exhaust gas by injecting ammonia into the exhaust gas containing dust and sulfur trioxide (SO 3 ) and supplying the ammonia-injected exhaust gas to an electric dust collector. An exhaust gas purification method for
When the temperature of the exhaust gas is measured and the measurement temperature is lower than the acid dew point of sulfuric acid, the ammonia is continuously injected into the exhaust gas, while the measurement temperature is equal to or higher than the acid dew point, the An exhaust gas purification method comprising stopping injection of the ammonia into the exhaust gas.
前記電気集塵器へ塵及び三酸化硫黄が含まれる排ガスを供給する排ガス管と、
前記排ガス管内を流れる前記排ガスにアンモニアを注入するアンモニア注入装置と、
前記排ガス管内を流れる前記排ガスの温度を測定する排ガス温度測定器と、
前記排ガス温度測定器によって測定された前記排ガスの測定温度が硫酸の酸露点未満の場合には、前記排ガスへの前記アンモニアの注入を継続する一方で、前記測定温度が前記酸露点以上の場合には、前記排ガスへの前記アンモニアの注入を停止するように前記アンモニア注入装置を制御する制御装置と、
を有することを特徴とする排ガス浄化装置。 An electric dust collector,
An exhaust pipe for supplying exhaust gas containing dust and sulfur trioxide to the electric dust collector;
An ammonia injection device for injecting ammonia into the exhaust gas flowing in the exhaust gas pipe;
An exhaust gas temperature measuring device for measuring the temperature of the exhaust gas flowing in the exhaust gas pipe;
When the measurement temperature of the exhaust gas measured by the exhaust gas temperature measuring instrument is lower than the acid dew point of sulfuric acid, the ammonia is continuously injected into the exhaust gas, while the measurement temperature is equal to or higher than the acid dew point. A control device that controls the ammonia injection device to stop the injection of the ammonia into the exhaust gas;
An exhaust gas purification apparatus comprising:
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Cited By (4)
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EP2397213A1 (en) * | 2010-06-18 | 2011-12-21 | Lab Sa | Method for managing corrosion risk in smoke treatment methods |
JP2012206055A (en) * | 2011-03-30 | 2012-10-25 | Chugoku Electric Power Co Inc:The | Consumption method of entire amount of ammonia in storage tank and system thereof |
CN105170331A (en) * | 2015-08-31 | 2015-12-23 | 浙江菲达环保科技股份有限公司 | Method for determining inlet flue gas temperature of low-low temperature electrostatic precipitator |
CN109847937A (en) * | 2019-03-04 | 2019-06-07 | 佛山华碳环境科技有限公司 | A kind of electric precipitation defogging method |
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JPH02265618A (en) * | 1989-04-07 | 1990-10-30 | Mitsubishi Heavy Ind Ltd | Capture of sulfur trioxide in waste gas |
JP2001179047A (en) * | 1999-12-24 | 2001-07-03 | Toshiba Corp | Wastewater treatment facility |
JP2001269601A (en) * | 2000-03-27 | 2001-10-02 | Hitachi Plant Eng & Constr Co Ltd | Device and method for treating exhaust gas |
JP2001269538A (en) * | 2000-03-28 | 2001-10-02 | Mitsubishi Heavy Ind Ltd | Device and method for treating waste gas |
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EP2397213A1 (en) * | 2010-06-18 | 2011-12-21 | Lab Sa | Method for managing corrosion risk in smoke treatment methods |
JP2012206055A (en) * | 2011-03-30 | 2012-10-25 | Chugoku Electric Power Co Inc:The | Consumption method of entire amount of ammonia in storage tank and system thereof |
CN105170331A (en) * | 2015-08-31 | 2015-12-23 | 浙江菲达环保科技股份有限公司 | Method for determining inlet flue gas temperature of low-low temperature electrostatic precipitator |
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