The invention relates to the technical field of
coal pulverizing, in particular to a storage bin type hot air
powder feeding and pulverizing
system adopting
tertiary air for heating. The storage bin type hot air
powder feeding and pulverizing
system comprises a boiler, a
fine powder separator for separating pulverized
coal from
tertiary air, a
powder discharging fan for conveying the
tertiary airand a tertiary
air heater for heating the tertiary air, the boiler comprises a
hearth and a
combustor in communication with the front end of the
hearth, and a tertiary air outlet of the
fine powder separator is connected with the
combustor through the powder discharging fan and the tertiary
air heater in sequence. The tertiary air separated by the
fine powder separator is heated and then sent to the
combustor, so that the tertiary air can be used as secondary air of a main
combustion area of the boiler, on one hand, the temperature of the tertiary air is increased, high-temperature combustionof the
hearth is facilitated, and on the other hand, the secondary air proportion is increased, hearth air distribution is optimized, hearth organization
combustion is facilitated, the pulverized
coal,
smoke and air are mixed more strongly,
combustion in the hearth is stronger, and therefore the carbon content of
fly ash is smaller, mechanical incomplete losses are smaller, and the combustion efficiency of the boiler is higher.