Method of recovery of excess gas energy of blast furnace gas

摘要

A method of recovery of furnace gas energy for use to recover excess gas energy from a single or a plurality of furnace gas energy recovering plants each including an expansion turbine mounted in each exhaust system of each blast furnace. In one embodiment, excess gas beyond the power of the respective expansion turbine to recover is removed from each exhaust system of each blast furnace concerned through a branch line, and the removed excess gas is introduced into another expansion turbine through a pressure control valve, to thereby recover the energy possessed by the excess gas. In another embodiment, excess gas is removed through a branch line from each exhaust system of each plant having excess gas beyond the power of the respective expansion turbine to recover mounted in each blast furnace, and the removed excess gas is introduced through a pressure control valve and a flow distribution valve into at least one plant having reserve in the furnace gas energy recovering capacity to thereby recover the energy possessed by the excess gas.PP The pressure control valve is regulated by pressure control valve regulating means having the functions of furnace gas pressure control and backflow prevention.