A high-temperature liquid blast furnace slag waste heat recovery device and its waste heat recovery method

Abstract

The invention provides a high temperature liquid blast furnace slag waste heat recovery device and a waste heat recovery method, the device comprises a heat exchange unit composed of a plurality of heat exchange modules connected in series, a steam separator connected to the output end of the heat exchange unit, and a soft water pressure circulation unit connected to the input end of the heat exchange unit, wherein the soft water pressure circulation unit is also in communication with the steam separator, the heat exchange modules are installed in a slag trough, each heat exchange module has ahigh temperature liquid blast furnace slag flowing channel and a heat exchange passage for introduction of soft water for heat exchange, a temperature detecting instrument is disposed at a water outlet of the heat exchange passage of the heat exchange module, and the soft water pressure circulation unit includes a boost water pump. Recovery of sensible heat of slag flowing between a slag skimmerand the head of the slag trough in high temperature liquid blast furnace slag can be maximized, high temperature and high pressure steam can be obtained, and the purpose of energy saving can be achieved; a new permanent metal structure slag groove is designed to replace a refractory material cast slag trough without repair, refractory materials can be saved, and the double effects of energy savingand cost reduction can be achieved.

Description

technical field [0001] The invention belongs to the technical field of energy saving and consumption reduction in the iron and steel industry, and in particular relates to a high-temperature liquid blast furnace slag waste heat recovery device and a waste heat recovery method. Background technique [0002] Blast furnace ironmaking is the process link with the highest energy consumption in iron and steel enterprises. High-temperature liquid blast furnace slag is a by-product directly discharged from the blast furnace during the blast furnace production process. The temperature is as high as 1500 °C and contains a lot of heat energy. During the movement of the slag ditch head, due to the erosion and corrosion of the slag ditch by the slag, the slag ditch must be repaired regularly, resulting in the consumption of refractory materials; at the same time, the movement of the slag from the skimmer to the slag ditch head The recovery rate of a large amount of heat contained in the pr...

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Problems solved by technology

[0002] Blast furnace ironmaking is the process link with the highest energy consumption in iron and steel enterprises. High-temperature liquid blast furnace slag is a by-product directly discharged from the blast furnace during the blast furnace production process. The temperature is as high as 1500 °C and contains a lot of heat energy. During the movement of the slag ditch head, due to the erosion and corrosion of the slag ditch by the slag, the slag ditch must be repaired regularly, resulting in the consumption of refractory materials; at the same time, the movement of the slag from the skimmer to the slag ditch head The recovery rate of a large amount of heat contained in the process is basically zero, which does not meet the requirements of my country's energy conservation and emission reduction policies and low-cost production and operation requirements

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