High temperature furnace slag sensible heat power generating method

Abstract

The invention relates to a high temperature furnace slag sensible heat power generating method, belonging to the technical field of iron-making surplus heat utilization. The method comprises the processes of molding and combining high temperature furnace slag, exchanging heat, generating electricity, etc. A forming device is used for extruding the high temperature furnace slag into furnace slag checker bricks, and the furnace slag checker bricks are sent into an adiabatic furnace channel to be sequentially arranged and combined at the same intervals between the front and the rear furnace slagchecker bricks; low-temperature flue gas enters into the furnace from an opening in front of an adiabatic furnace through a fan, and is heated up to be high-temperature flue gas by the high temperature furnace slag checker bricks; a furnace slag checker brick group is driven by a lower chain machine to do intermittent motion forward at regular time, the low-temperature furnace slag checker bricksarranged at the front row are sent out of the adiabatic furnace according to the time interval of 5-100min, and the newly molded high-temperature furnace slag checker bricks arranged at the rear row are synchronous with the low-temperature furnace slag checker bricks; after low-pressure and low-temperature vapor is heated to be high-temperature and high-pressure saturated vapor by the high-temperature flue gas through a surplus heat boiler, electric power is output by a steam turbine which does work by expansion; after heat exchange, the low-temperature flue gas flows back through the fan, and the discharged low-pressure vapor enters the surplus heat boiler for heating in a circulating way again after converging with low-pressure pipe network vapor.

Description

technical field [0001] The invention belongs to the technical field of ironmaking waste heat utilization, and in particular provides a high-temperature slag sensible heat power generation method, which adopts slag forming and checker brick heat exchange technology to realize cascaded utilization of energy resources. technical background [0002] Iron and steel is a high energy consumption and high pollution enterprise in my country's industry. There is a great potential for waste heat and energy in ironmaking, sintering, coking, steelmaking, steel rolling and other processes. In the ironmaking blast furnace, the recovery and utilization of sensible heat of high-temperature slag has a large space for recovery and utilization, and there are physical heat recovery and chemical heat recovery methods, among which dry granulation heat recovery technology and chemical heat recovery technology are the key development directions in the future. Physical heat recovery is a heat recover...

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Problems solved by technology

[0003] The original technology of treating blast furnace slag with water flushing slag, although the process is simple, has a low utilization rate of energy in the wet process. Although the rotary cup granulation technology has high efficiency, it requires rapid rotation of high-temperature slag and consumes a lot of power. , technically not economical enough to be practically applied

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