System and method for heating, supplying power and cooling by using blast furnace slag water, exhaust steam and smoke waste heat

Abstract

The invention discloses a system and method for heating, supplying power and cooling by using the blast furnace slag water, exhaust steam and smoke waste heat. The system comprises a slag water subsystem, a heat exchanging subsystem and a hot-water utilizing subsystem; the heat exchanging subsystem is connected with the slag water subsystem and the hot-water utilizing subsystem respectively; the heat exchanging subsystem is used for exchanging the heat of the slag water, the exhaust steam and the smoke step by step; and the heat-exchanged hot purified water is utilized by the hot-water utilizing subsystem, namely, the heat exchanged hot purified water is delivered to a heating device, a low-temperature power generating device and a low-temperature cooling device respectively to heat, supply power and cool. Compared with the prior art, the system has the advantages that: the waste hear resource of the exhaust steam is recovered, the thermal pollution and the visual pollution caused by the exhaust steam are reduced, the energy is recycled step by step by fully utilizing the characteristics that the temperature of the slag water, exhaust steam and smoke increases step by step, the heating, power supplying and cooling functions are fulfilled, the corresponding energy is provided according to the needs of the user, and good economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of coke oven flue gas waste heat, in particular to a system and method for co-supplying heat, electricity and cooling of blast furnace slag washing water, exhaust steam and flue gas waste heat. 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 leads to waste of energy such as heat energy and electricity. At the same time, iron and steel enterprises need a large amount of high-grade steam as a heat source for heating devices, and there i...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a system and method related to the co-supply of blast furnace slag water, exhaust steam and waste heat of flue gas, so as to solve the problem of using recycling equipment in the prior art to flush slag water, exhaust steam and waste heat of flue gas Utilization still has the characteristics of not making full use of slag washing water, exhausted steam, and gradual increase of flue gas temperature, and the energy is recycled and utilized step by step, so that the problems of heat pollution and visual pollution are increased; in addition, corresponding energy cannot be provided according to user needs , causing energy waste, random discharge, and serious economic and social problems

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