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What are the coal-fired boilers? how to choose?

Coal-fired boilers, as the name suggests, a boiler that uses coal as a fuel.
There are many types of coal-fired boilers. According to the medium: coal-fired hot water boiler, coal-fired steam boiler, coal-fired thermal oil boiler. According to the type of grate: chain grate coal-fired boiler, fixed grate coal-fired boiler, reciprocating grate coal-fired boiler.

You can choose the coal-fired boiler of the corresponding medium according to the production needs of your own factory. Care must be taken with regard to grate selection, as each grate has its own different effects.

Chain grate: One of the most widely used mechanized combustion equipment in industrial boilers, but with a certain range of coal types. The burning method of the chain grate is to burn the moving fire bed, and the fuel ignition condition is “limited fire”. The fuel enters the grate through the coal hopper, and the combustion process begins as the grate moves into the furnace, and the burned cinder is discharged to the slag well at the tail of the grate as the grate moves.
The chain grate has higher requirements on the quality of coal. The burning coal is usually the second-class bituminous coal with low calorific value ≥17750J/Kg, volatile matter>38.5% and ash content ≤32.4%.

Fixed grate: Fixed grate furnace is mainly divided into two types: hand-burning furnace and coal-burning machine furnace. The hand-fired boiler is a manually operated fixed grate-fired boiler; the coal-shovel boiler essentially refers to a combination of a coal-splitting machine and a fixed-fired boiler. The boiler is in a boiler with a small capacity (generally D ≤ 10 t /h) is widely used. The fixed grate generally uses coal with larger coal mass as fuel. If the coal is small, it is easy to cause coal to leak from the gap of the grate, resulting in waste.

Reciprocating grate: It is a kind of mechanical push grate.Coal is added from the coal hopper. Through the reciprocating motion of the grate, the coal slowly enters the furnace from front to back and gradually moves backwards. After the new coal leaks from the coal hopper, it passes. The furnace dry zone, the high temperature coal zone and the ash sub-combustion zone enter the furnace and then fall into the slag pit.

This grate burns more fully, has lower heat load and wind pressure, less fly ash, and basically does not see the color of smoke during normal combustion. The reciprocating grate coal-fired boiler has good ignition conditions and can adapt to coal with high moisture content and high ash content. The movement mode is diversified, and the coal type which is generally coking and slagging can be properly burned, and the coal can be fully burned and has the function of saving coal.

EPCB boilers can be used to plan a complete boiler solution according to your company’s specific conditions, from boiler selection to boiler room design, to on-site guidance for one-stop service. We are a boiler manufacturer with 35 years of experience in boiler manufacturing. Our boilers are sold in more than 100 countries and regions at home and abroad, and now more than 15,000 companies are using our boilers.We have a 120,000 square meter boiler plant and seven modern boiler production lines. The annual output of the boiler is 1200 units. Our customers are very recognized by us! If you have any problems with the boiler, please feel free to contact us and we will get back to you as soon as possible.