Method and device for sensible heat recovery of quenched dry crushing molten blast furnace slag

Abstract

The invention relates to the field of energy recovery and utilization of steel and nonferrous metallurgy industries, in particular to a quenching dry type broken fusion blast furnace slag sensible heat recovery method and a quenching dry type broken fusion blast furnace slag sensible heat recovery device which is characterized in that a heat exchange medium is mixed with smelted slag to perform quenching heat exchange so as to prompt the solidification of the smelted slag; waste heat of the high-temperature heat exchange medium and high-temperature slag blocks is respectively recovered via water and the air, as a result, one drop of new water is not used. Compared with the prior art, the quenching dry type broken fusion blast furnace slag sensible heat recovery method and the quenching dry type broken fusion blast furnace slag sensible heat recovery device have the benefits that the heat exchange solidification time of the smelted slag is shortened via mixing the heat exchange medium and the smelted slag, the purpose of the recovery and utilization of the blast furnace slag sensible heat is achieved by combining movable bed heat exchange and waste heat generation; the obtained blast furnace slag and steam can be respectively used for manufacturing cement and generating power. Moreover, compared with the present water quenching method, the quenching dry type broken fusion blast furnace slag sensible heat recovery method and the quenching dry type broken fusion blast furnace slag sensible heat recovery device effectively recover blast furnace slag sensible heat, save energy consumption of dry waster slag and achieve the zero use of the new water; compared with a wind quenching method, the quenching dry type broken fusion blast furnace slag sensible heat recovery method and the quenching dry type broken fusion blast furnace slag sensible heat recovery device achieved the quick cooling of the fusion blast furnace slag by using the heat exchange medium and a water cooling wall, and no high-pollution mineral wool is generated.

Description

technical field [0001] The invention relates to the field of energy recovery and utilization in iron, steel and nonferrous metallurgy industries, in particular to a method and device for recovering sensible heat from quenched dry crushing molten blast furnace slag. Background technique [0002] The iron and steel industry provides important basic raw materials for the development of the national economy. It is a resource-intensive industry that consumes a lot of energy and resources. It also emits a large amount of waste while producing steel products, causing serious pollution to the environment. Molten blast furnace slag is a by-product of blast furnace ironmaking, its discharge temperature is 1400-1600°C, and its heat enthalpy is about 60Kg / t of standard coal (slag). In 2012, my country produced 657.9 million tons of pig iron, calculated as 0.35 tons of slag per ton of iron, and the output of blast furnace slag was 230 million tons. It can be seen that the recovery of se...

AI Technical Summary

Problems solved by technology

These water quenching methods not only consume high water consumption for slag flushing, and the sensible heat is not effectively recycled, but also cause pollution to the environment.

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