Requirement of Ash Handling System In Thermal Power Plant’s coal is generally used as fuel and hence the ash is produced as the byproduct of Combustion. Ash generated in power plant is about 30- 40% of total coal consumption and hence the system is required to handle Ash for its proper utilization or disposal.
ASH DISPOSAL : 1. A large quantity of ash, is produced in steam power plants using coal. 2. Ash produced in about 10 to 20% of the total coal burnt in the furnace. 3. Handling of ash is a problem because ash coming out of the furnace is too hot, it is dusty and irritating to handle and is accompanied by some poisonous gases 4.
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3.Fly Ash It is collected from :-1-ESP hoppers 2-Air preheaters hoppers 3-Economiser hoppers It is 80% of total ash. 4.Wet system In this system ash conveying media is water.
Ash Handling System In Thermal Power Plant In thermal power plants, coal is used as a fuel for generating electricity. After burning of coal, 40 % of total coal consumption is converted into ash which need to be properly disposed-off from the thermal power plant. Types of Ash Generated in Thermal Power Plant
The design of the ash handling plant is dependent upon the method of ash disposal. It may be pumped into a disused quarry or transported from the power station for processing into building materials. A typical system, outlined below, includes both facilities.
When new power plants were being designed in the 1970’s, the state of the art ash handling systems at the time were closed loop water recirculation systems that involved a “tank farm” thousands of feet away from the boiler. Figure 5: Conventional Bottom Ash Dewatering System In these systems the bottom ash was pumped from the ash hoppers .