What is a traveling grate?
Traveling grates are designed for the use of granulated fuels, treated or not, of medium size. The biomass used for combustion can have a high ash content and a medium-low percentage of humidity.
What is chain grate stoker?
Definition of chain-grate stoker : a wide endless traveling chain that feeds and supports the fuel in a boiler furnace.
What is the stoker describe the process of underfeed and overfeed stokers?
Overfeed stoker is the type of stoker in which the coal is fed from the top and air is blown from below. Underfeed stoker is one where coal is fed from underneath and the air is fed from top.
What is the function of grate?
A furnace grate is provided in a steam boiler furnace for supporting the solid fuel in the furnace. Grate is so designed that it can also allow air to admit air in the solid fuel for combustion.
What is grate technology?
Grate combustion is the best-proven thermal waste treatment technology for mixed municipal solid waste, and the heart of any modern, state-of-the-art energy from waste (EfW) plant.
What is boiler grate?
Grates are provided in solid fuel boilers to help with the fuel-burning such as biomass or coal. It is designed to enable the passing of air for combustion.
What does a stoker do?
stoker, machine for feeding coal or other solid fuel into a furnace, usually supporting the fuel during combustion. A good stoker also supplies air for combustion and regulates the rate of burning and, in large installations, disposes of the ashes.
What is stoker boiler?
Stoker boiler means a boiler that burns solid fuel in a bed, on a stationary or moving grate, which is located at the bottom of the furnace.
What is stoker fired boiler?
Stoker fired boilers are the smallest units among hard coal fired boilers. They are mainly operated in local or industrial heat or heat and power generating plants.
What does the overfeed stoker and underfeed stoker principles of coal firing and working of spreader stoker with the help of neat sketch mean?
In case of overfeed stokers, the coal is fed into the grate above the point of air admission. While in case of underfeed stokers, the coal is admitted into the furnace below the point of air admission.
What are the principles of stokers?
Explanation: In under feed type of stokers, the fuel and air move in the same direction. In this stoker air after passing through the holes in the grate comes in contact with the raw coal. As air diffuses through the bed of raw coal, it mixes with the volatile matter generated by the raw coal.
What is called grating?
A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings usually consist of a single set of elongated elements, but can consist of two sets, in which case the second set is usually perpendicular to the first (as illustrated).
What is grate area?
The grate area is the area of the grate (length x width). The larger the grate area, the more fuel can be burned per hour. The amount of fuel burned also depends on the fuel or bed movement velocity.
What is CFB boiler?
Circulating fluidized bed (CFB) boilers use all kinds of solid fuels, from biomass to refuse derived fuel (RDF), to produce reliable and efficient clean energy. Fuel flexibility is at the core of CFB technology, contributing to fossil fuel and CO 2 emissions reduction while using local alternative renewable fuels.
What is a spreader stoker boiler?
Fuel Feed. The pneumatic spreader stoker is the most common fuel feed mechanism for the Vibrating and Traveling Grates. An adjustable air swept fuel distributor is used to deposit the fuel into the furnace and on to the vibrating grate.