What is stoker firing?
Mechanical Stoker Firing. When fuel i.e. coal is put into the steam boiler furnace by means of a mechanical stoker, the firing of boiler method is referred as mechanical stoker firing. There are mainly two types of mechanical stoker firing systems.
What is stoker in thermal power plant?
stoker, machine for feeding coal or other solid fuel into a furnace, usually supporting the fuel during combustion. Power for running a stoker is usually furnished by an electric motor, and control of combustion is achieved by variable speed or intermittent drive.
What are the two types of stoker fired boiler?
The stoker-fired boilers are classified into two types namely chain-gate or traveling grate stoker and. Thermax Under feed stoker technology – YouTube12 Jun 2018 Under feed stoker technology for compact boilers and heaters ensuring silent and highly efficient combustion.
What are the various types of stokers used for coal firing?
Also called Mechanical Stokers.
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.
How coal is pulverized?
Pieces of coal are crushed between balls or cylindrical rollers that move between two tracks or “races.” The raw coal is then fed into the pulverizer along with air heated to about 650 °F (340 °C) from the boiler. The powdered coal from the pulverizer is directly blown to a burner in the boiler.
What are the principal 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.
How does a mechanical stoker work?
A mechanical stoker is a mechanical system that feeds solid fuel like coal, coke or anthracite into the furnace of a steam boiler. The under feeder pushes fresh coal into the bottom of the furnace and then advances it upwards so that it mixes with the burning coal above.
What is the difference between overfeed and underfeed stoker?
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 are the principles of stokers?
What is difference between Afbc and CFBC boiler?
AFBC means atmospheric fluidized bed combustion, where the furnace pressure is atmospheric pressure. CFBC boiler stands for circulating fluidized bed combustion boiler, the furnace is pressurised and the furnace gas is recirculated to capture the unburnt carbon, to increase the thermal efficiency of the boiler.
What is an spreader stoker?
Spreader stokers utilize a combination of suspension burning and grate burning. The coal is continually fed into the furnace above a burning bed of coal. The coal fines are burned in suspension; the larger particles fall to the grate, where they are burned in a thin, fastburning coal bed.
What is a spreader feeder and how does it work?
Spreader feeders have the capability to uniformly feed coal into a device that can propel it along the depth of a grate in an evenly distributed pattern. Many designs have been used successfully over the years. The coal feed mechanisms include gravity reciprocating plates and metering chain conveyors.
How does a chip spreader work on a gas boiler?
Immediately inside of the boiler ther is an iron chip spreader that deflects the chips horizontally to provide for an even spread over the grates and help further facilitate the over grate combustion of the particulates. Save up to 80% on your next printer ink cartridges!
Why choose Indeck Keystone Energy for your Stoker?
In addition to the traditional coal or lignite fired applications, both the Indeck Keystone Energy Travagrate® and stationary grate stokers have been supplied to fire the less common biomass fuels found throughout the U.S. and the world. Indeck Keystone Energy provides service, repair, and upgrades for all stokers.