Total heat recovery system for molten blast furnace slag

Abstract

The invention discloses a total heat recovery system for molten blast furnace slag, which solves the problem that waste heat of blast furnace slag is low in utilization rate in the prior art. Molten blast furnace slag can be poured into a high-pressure steam tank filled with water, water generates a great deal of steam upon high heat, the blast furnace slag is broken into particles, and the generated steam is recycled through a high-pressure steam tank. Devices include a slag feeding hopper, a conveying and storage passage and the high-pressure steam tank for recycling steam. The conveying and storage passage is provided with an insulating device and a heating device, and the upper end and the lower end of the conveying and storage passage are connected with the slag feeding hopper and the high-pressure steam tank respectively. The upper portion of the high-pressure steam tank is provided with a water injection hole and a steam outlet, and the lower portion of the high-pressure steam tank is provided with a slagging device. The system fully utilizes total heat (sensible heat and latent heat) of the blast furnace slag, and the efficiency of recycling waste heat of the blast furnace slag is improved.

Description

technical field [0001] The invention relates to the field of energy recovery and utilization, in particular to a total heat recovery system for molten blast furnace slag in the steel and nonferrous metallurgy industries. Background technique [0002] China's iron and steel and metallurgical industries are the industries that consume the most energy, accounting for 10-15% of the country's total energy consumption. The production process of iron and steel consists of iron-making process and steel-making process. The energy consumption of the iron-making process is the largest. In the iron-making process, about 0.34 tons of blast furnace slag with a temperature of about 1400°C is produced for every ton of iron smelted. The blast furnace slag contained The thermal energy is considerable. [0003] At present, the treatment of blast furnace slag mostly adopts the water quenching method, that is, the molten blast furnace slag is poured into water, and the water explodes at high te...

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Problems solved by technology

[0003] At present, the treatment of blast furnace slag mostly adopts the water quenching method, that is, the molten blast furnace slag is poured into water, and the water explodes at high temperature, breaking the blast furnace slag into particles and generating a large amount of steam. The disadvantage of this method is that not only the waste heat of blast furnace slag It cannot be used, and it causes a lot of waste of water resources, and it also causes serious pollution to the atmosphere, water and soil, and deteriorates the environment.

[0004] Chinese patents with application numbers 200810229556.2 ("Blast Furnace Slag Sensible Heat Recovery System"), 200910187586.6 ("Method and Device for Recovery of Sensible Heat from Molten Blast Furnace Slag"), and 201120063272.8 ("High Temperature Sensible Heat Recovery System for Molten Blast Furnace Slag") are all for The sensible heat of blast furnace slag is recovered and utilized, while the latent heat of blast furnace slag is wasted, which reduces the utilization rate of blast furnace slag

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