What are the primary fan, secondary fan, and exhaust fan used for?
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I need help; I don’t understand anything and have just started working in a chemical plant
Do you have the working principle of the dust collector there? What is the function of the lift valve? What is a bypass valve used for? This is too difficult!
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Primary air in a boiler is primarily used to supply air to the coal, ensuring that the fuel burns fully in the furnace. Secondary air is designed for fluidized bed boilers, primarily to ensure complete combustion of the carbon powder that has not burned fully, thereby improving the boiler’s combustion efficiency. That air induction is designed to control the negative pressure in the furnace, and it is used for the exhaust of combustion gases.
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The primary air and secondary air in circulating fluidized bed boilers need to be clearly explained from a structural perspective. The air supplied to the bottom of the furnace is primary air, which is used for fluidization in the dense-phase region; secondary air enters tangentially from a certain position at the upper part of the boiler, thereby achieving a certain wind speed in the upper sparse-phase section and aiding in combustion.