COMBUSTION METHOD OF FINE PULVERISED COAL AND REGULAR PULVERISED COAL IN PULVERISED COAL BURNER, AND DEVICE FOR ITS IMPLEMENTATION

摘要

FIELD: power industry. ^ SUBSTANCE: combustion method of fine pulverised coal and regular pulverised coal in PC burner involves introduction of coal and air and intensification of combustion process; coal combustion process is performed inside heat insulated chamber the inner space of which is formed by means of four coaxial channels the first internal coaxial channel of which is used for combustion of fine pulverised coal, and the third coaxial channel is used for regular pulverised coal while the second and the fourth coaxial channels are used for supply of additional air to coal combustion zone. Intensification of coal combustion process is performed due to increase in turbulence and constant expansion of hot flow of PC mixture in the direction of its movement, as well as due to arranging inside coaxial channels of hollow cylindrical shells from fire-resistant and low-heat-conducting material, for example pyrographite. Increase in turbulence of hot PC mixture flow is provided due to transfer of rotational movement to coal flows and additional air in initial sections of coaxial channels, as well as owing to additional vortex formation in streamlining zone of edges of hollow cylindrical shells from fire-resistant and low-het-conducting material. Increase in turbulence of hot PC mixture flow is provided due to changing the vector direction of tangential velocity of hot flow inside the next coaxial channel to opposite direction relative to vector direction of tangential velocity of hot flow of the previous coaxial channel. ^ EFFECT: invention allows improving fuel combustion quality and reducing the emission of hazardous substances to atmosphere. ^ 8 cl, 4 dwg