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Industrial coal fired boiler is mainly composed of pulverized coal preparation system, burner, heating surface and air preheater.
1)Direct blowing type milling system:
The ground coal powder is directly sent to the furnace for combustion. It is suitable to use medium-speed and high-speed coal mills, which are suitable for grinding soft bituminous coal and lignite.
The medium-speed coal mill direct-blowing pulverizing system is divided into two types: positive pressure type and negative pressure type. Modern large-capacity boilers mostly use positive pressure systems.
2) Intermediate storage type milling system:
The characteristic is that the output of the coal mill and the fineness of the coal powder are independent of the boiler load, and it is suitable for the steel ball coal mill which can grind various kinds of hardness coal. A furnace is a boiler that burns coal. It refers to a thermal power plant that burns coal in a furnace to release heat and heats the heat medium water or other organic heat carrier (such as heat transfer oil) to a certain temperature (or pressure).