System and method for generating power with blast-furnace slag washing water and exhaust steam low-temperature waste heat

Abstract

The invention discloses a system and a method for generating power with blast-furnace slag washing water and exhaust steam low-temperature waste heat. The system comprises a blast-furnace slag washing subsystem, a precipitation heat exchange subsystem and a low-temperature power generating subsystem, and exhaust steam and high-temperature slag washing water are separated from the slag washing water after slag washing of the blast-furnace slag washing subsystem, and then are delivered into the low-temperature power generating subsystem for generating power by the slag washing water after heat exchange of the heat exchange subsystem. Compared with the prior art, when recycling the blast-furnace slag washing water and the exhaust steam low-temperature waste heat, the system has the advantages that heat in the slag washing subsystem is comprehensively recycled so that the efficiency of the power generating subsystem is improved, cooling towers are dual-purpose, the number of the cooling towers is decreased, field resources are used, the blast-furnace slag washing water and the exhaust steam waste heat resources are recycled, energy is saved, emission is reduced, and fine economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of coke oven flue gas waste heat recovery and utilization, in particular to a blast furnace slag flushing water and exhaust steam low-temperature waste heat power generation system and method. technical background [0002] The high temperature molten slag produced in the process of blast furnace ironmaking is as high as 1450℃, which contains a large amount of waste heat resources. The existing process mainly adopts water quenching method for resource treatment. During water quenching of slag, a large amount of exhausted steam and hot slag flushing water are generated, and the heat of slag is discharged into the environment through exhausted steam and hot slag flushing water. Electricity, resulting in waste of energy such as heat and electricity. [0003] The water quenching process of slag is very mature, and the "water slag" produced has high activity. It can be used not only as clinker for cement, but als...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a blast furnace slag flushing water and exhaust steam low-temperature waste heat power generation system and method to solve the incomplete recovery of heat contained in the slag flushing system in the prior art, and a large amount of exhaust steam with waste heat is discharged to the atmosphere through the chimney. Increase thermal pollution and visual pollution caused by exhausted steam chimneys; at the same time, blast furnace slag flushing water and exhausted steam carry a large amount of waste heat resources, which are discharged into the atmosphere and cause pollution, resulting in serious social and environmental problems.

Images