System for High Temperature Waste Heat Recovery from Molten Slag in Cooling Process

摘要

PURPOSE: A system for recovering high temperature waste heat from molten slag granulating facility of blast furnace is provided through which high temperature heat source of power generation system for producing electricity is obtained, and which solves contaminative hot water treatment problems and improves heat efficiency of the generation system. CONSTITUTION: The system for recovering high temperature waste heat from molten slag granulating facility of blast furnace comprises an agitation tank(22) to the upper part of which a preheater(10) is connected, at the center of which a high temperature waste heat recovering heat exchanger(18) comprising spiral shaped heating tubes(16) is installed, and at one side of the lower part of which a slurry outlet(20) is installed; a heat exchanger(24) to an inlet of the upper part of which a humid vapor pipe connected to the outlet of the high temperature waste heat recovering heat exchanger(18) is connected; a recovery pipe(28) one side of which is connected to an outlet of the lower part of the heat exchanger(24), the other end of which is connected to the inlet of the preheater(10), and at a certain part of which a pump(26) for high boiling point medium is installed; and a power generation system for recovering middle to low temperature heat(40) integrally comprising a turbine(30) connected to a humid vapor pipe connected to an outlet of the upper part of the heat exchanger(24), a condensation heat exchanger(34) which is connected to an inlet of a humid vapor pipe connected to the outlet of the turbine(30), and on which a cooling water inlet pipe(32) is integrally formed, and a cooling water supply pipe(38) which is connected to the outlet of the condensation heat exchanger(34) and the inlet of the lower part of the heat exchanger(24), and at a certain part of which a pump(36) for organic refrigerant is installed.