How to control Sox and NOx emission in Power Plant - ASKPOWERPLANT

How to control Sox and NOx emission in Power Plant

How to control Sox and NOx emission in power plant
BOILER OPERATION
2

How to control Sox and NOx emission in Power Plant

Now these days power industries left huge amount of smoke in the enivorment which causes the air pollution. This smoke is comes out from the boiler chimney in the form of waste flue gases which are generated from the combustion of fuel. These flue gases are contain sulphur dioxide and nitrogen oxide which cause the air pollution and also effect the human life also . in this article we discussed some methods for how to control Sox and NOx emission in power plant.

Method used in control Sox

1. Switching the low sulphur fuel
2. Desulfurization the fuel
3. Utilizing a flue gas desulfurization ( FGD ) system
4. Combustion control techniques

Fuel desulfurization :-

Which primarily applies to coal , involves removing sulphur from the fuel prior to burning. Flue gas desulfurization involves the utilization of scrubber to remove Sox emission
From the flue gases. Flue gas desulfurization systems are classified as either non – regenerable or regenerable.

1. Non regenerable FGD system, the most common type result in a waste product that requires proper disposal.

2. Regenerable FGD converted the waste by product into a marketable product , such as sulfuric acid. Sox emission reduce 90 – 95 % can be achieved through now these days FGD. fuel desulfurization and FGD is a primarily source of reduction of Sox emissions for large utility boilers. Generally the technology cannot be cost justify on industrial boilers.

3. For users of industrial boilers, utilizing low sulphur fuels is the most effective method of Sox reduction. Beacuse Sox emission primarily depending upon the sulphur content of the fuel, burning fuels containing a minimal amount of sulphur can achieved Sox reduction, without the need to install and maintain expensive equipment.
4. Combustion control techniques
Combustion control techniques reduce the amount of NOx emission by limiting the amount of NOx formation during the combustion process. This is typically accomplished by lowering flame temperatures. Combustion control techniques are more economical than post combustion methods and are frequently utilized on industrial boilers requiring NOx controls.

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Method use to control NOx :-

1. Post combustion method :-

Post combustion method is adopted for NOx emission after formation while combustion control techniques prevent the formation of NOx during the combustion process. Post combustion method is more expensive than combustion control techniques and generally is not used on boilers with input of less than 100 MMBtu/hr. Following is a list of different NOx control methods.
Post combustion control methods include
Selective non catalytic reduction
Selective catalytic reduction

2. Combustion control techniques:-

-Low excess air firing
-Low nitrogen fuel oil
-Burners modification
-Water /steam injection
-Flue gas re-circulation

Each method results in a different degree of NOx control. It is assumed that when firing natural gas , low excess air firing typically reduce NOx by 10 % , flue gas recirculation by 75 % , and selective catalytic reduction by 90 %

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