A
sintering flue gas reduction and
waste heat comprehensive utilization process is composed of
flue gas circulating
sintering, sinter vertical cooling, circulating
air cooling,
waste heat power generation and the like. The process comprises the following specific steps that part of
sintering flue gas is guided out from a sintering trolley head and
tail bellows branch pipes, and after dedusting and boosting, the
flue gas is circulated to the surface of a middle material layer of a sintering trolley; sintering
waste gas in the middle of the sintering
machine trolley is guided out and subjected to dedusting and purification, most of the purified
waste gas is emitted, and a small amount of
waste gas takes participation in high-temperature sinter vertical cooling; the sinter at the
tail end of the sintering trolley is crushed and then enters a vertical cooling furnace,
counter flow cooling is conducted on the crushed sinter and circulating air blown from the bottom, and the sinter is discharged; the circulating
cold air enters a
waste heat power generation system after being subjected to heat exchange and primary dedusting; and the circulating air flowing through the waste
heat power generation
system is subjected to secondary dedusting and is mixed with part of purified sintering waste gas, boosting is conducted, and then the
mixed gas enters the vertical furnace for hot ore circulating
air cooling. According to the sintering
flue gas reduction and waste heat comprehensive utilization process, the sintering
flue gas and sinter
sensible heat can be utilized effectively, the flue gas emission is
cut down, pollutants such as dust, SO2,
NOx and dioxin can be removed at the same time, the occupied space is small, and the investment is small.