Process and equipments for operating high-pressure boilers with low-quality fuels, particularly lignitic fuels, generating a low emission of dangerous products

摘要

Process and associated equipment utilize at least one prefiring according to the principle for the low-temperature carbonization gas after-burning divulged information with suction draught. Target of the invention will produce a process together with associated equipment, using the harmful flue gas components of its limit, during the burning of low-quality fuel, occur to a minimum. According to the present invention, this is realized with a process, together with associated equipment, wherein in the first phase before high-pressure boiler, one alkaline steam is blown through the low-temperature carbonization air-flow of prefiring supply or enters low-temperature carbonization gas burner, which steam is obtained by the mist for mixing droplet form from the grey milk solution being preferably saturated with saturated vapor. In this respect the supply of alkaline steam be affected so that it by fully with low-temperature carbonization air-flow mix, it enter high flame temperature region, and accommodate the harmful sulphur compound of lime reaction to form wet, collectable component while. Still the therefore increased solid content in flue gas and harmful sulphur compound for including largely is removed from flue gas in second, in the boiler. of high pressureDust and desulfurization installationimageare combined later