Smaller size boiler can be operated by hand firing system. In this case, the railway is used to transport the coal from the mines directly to the power stations, most of the thermal power stations will receive the coal from rail transport. The efficiency of a pulverised fuel firing system depends mostly on the size of the powder. The lighter ash particles and combustion gases fly away with primary air. Lot of fly-ash in the exhaust creates a problem. This effectively prevents air circulation in the interior of the pile. Cold ashes are carried to the sump through the trough. Due to pulverization, the surface area of coal becomes much larger, and in this method air required for combustion is much less. In this post, you'll learn about what is a solar power plant and different types of solar power plants. The beds must be washed periodically to remove the dirt that collects in the voids of the filter material. For obtaining the most calorific value of coal, the coal is pulverised in fine powder and then mixed with sufficient air. To burn the combustible gases, additional secondary air must be fed at high speed into the furnace to supply the needed oxygen. 3. A simple coal handling layout as shown in the figure. g. Medium pressure boiler: 3.8MPa ≤ P ≤ 5.4MPa. This method of firing provides good flexibility to meet load fluctuations, since ignition is almost instantaneous when firing rate is increased. Our combustion systems ensure complete combustion of all waste types for stable treatment. Flue gas treatment systems reliably eliminate toxic substances from flue gasses and help lower life cycle costs. Iron must be removed, otherwise during pulverizing iron particles will cause spark which results in unwanted fire hazard. If the coal mine is nearer to the plant or when the necessary railway facilities are not available, then the coal is supplied by truck. It consists of an endless belt running over a pair of end pulleys and supported by a series of rollers called idlers provided at regular intervals. Types of Boilers Used in Power Plants 2017-07-31 17:31:22 . Stoker/Grate Firing: Grate-type boilers are likely the oldest commercial combustion technology still in use today. The sections also oscillate parallel to the fuel bed movement. Notify me of follow-up comments by email. Not only initial cost, running cost of this plant is quite high as separate pulverisation plant is to install and run additionally. You have entered an incorrect email address! Necessary to protect the collector from sparking. In this system, a trough or drain is provided below the boilers and the water is made to flow through the trough. On the inward stroke, the ram forces the coal into the retort, thereby slowly move the entire down the length of the stoker. It supplies a large quantity of coal continuously without any problem and loss. b. Supercritical boiler: 22.1MPa ≤ P ≤ 27.0MPa; Types of power plant boilers. This stoker consists of a series of sloping parallel troughs formed by tuyers stocks. It is generally used for the transfer of coal when filling of the number of storage bins situated under the conveyor is required.
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