Discuss the effects of pollutantss emmited on the atmosphere During the course of power generation with coal.

8.5 Due on 7 DEC 0800 In some states where coal is in abundant supply, the coal is the primary raw material used to produce electricity. However, the process of generating electricity occurs in several stages:

Coal is burned in a large boiler to make high-pressure, high-temperature steam;
The steam is passed through a turbine;
The turbine converts the thermal energy in the steam to mechanical energy; and
The spinning turbine then drives the generator to produce electricity.
During the course of power generation with coal, pollutants are emitted into the atmosphere. The three main pollutants which are emitted into the atmosphere, detrimental to the environment, are nitrogen oxides, sulfur dioxide, and particulates. Specialized equipment is typically used at different points throughout the steam generation process to minimize emissions from the power plant:

The first step in reducing emissions occurs by utilizing a low nitrogen oxides (NOx) burner to burn the coal. The equipment regulates the rate of combustion of the coal by controlling the amount of air available at different elevations within the boiler to complete the combustion. This process adjustment results in lower NOx emissions.
The flue gas is passed through an electrostatic precipitator (ESP) after it exits the boiler. In the ESP, a series of positively charged collection plates remove negatively charged particulate matter from the flue gas. The ESP captures more than 99 percent of the particulate matter in the flue gas.
Next, a scrubber is used to control the sulfur dioxide compound in the flue gas. These are water soluble compounds in the emissions. As the flue gas passes through the scrubber, it is mixed with limestone slurry in water. The limestone reacts with the flue gas and absorbs the sulfur dioxide in the flue gas.
What are the environmental consequences of not using these emission control devices? There are two main aspects to this problem – one is the regulatory consequences of non-compliance and the second is the cost of compliance issues. Are there any other cost-effective, alternate power generation process changes or raw material processing operations that can either add on, or have the same effect, of reducing pollutant emissions from these types of plant?

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