Semi-wet slag treatment waste heat recovery generating system and method

Abstract

The invention discloses semi-wet slag treatment waste heat recovery generating system and method. The system comprises a slag treatment system, a waste heat recovery system and a waste heat generating system, wherein the slag treatment system is a semi-wet slag treatment system; the semi-wet slag treatment system cools liquid slag of a blast furnace by utilizing less high-pressure water fog and mechanically crushes the slag into raw materials used for manufacturing cement by utilizing a crushing plant; the waste heat recovery system carries out fractional recovery and fractional storage on the waste heat of the semi-wet slag treatment system; and the waste heat generating system generates electricity by utilizing the heat energy fractionally stored in a multistage heat energy storage system. The invention has the advantages that the slag byproduct quality is not lowered, the quality of the recovered waste heat is high, the recovery efficiency is high and the thermoelectric conversion efficiency is high.

Description

technical field [0001] The invention relates to the fields of slag treatment and waste heat recovery and utilization in iron and steel metallurgical processes; in particular, it refers to a semi-wet slag treatment waste heat recovery power generation system and method involving semi-wet slag treatment, slag waste heat recovery and storage, and waste heat power generation. Background technique [0002] Iron and steel metallurgical process - blast furnace ironmaking, converter steelmaking and other processes produce a large amount of smelting slag at a rate of 30-40% of the steel output every year, and the global output is hundreds of millions of tons per year. The heat energy taken away by it is equivalent to standard There are more than 20 million tons of coal, which is equivalent to more than 15 billion yuan. In order to effectively consume this part of the slag and turn waste into treasure, a lot of work has been done by the predecessors. [0003] Among them, the most used...

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Problems solved by technology

The disadvantages of this dry treatment method include: on the one hand, if the wind speed is too high, the liquid slag can easily be blown into flocs; if the wind speed is low, it is not enough to take away a large amount of heat energy , will cause the slag to stick again, increasing the unstable factors of granulation production

When stored as medium-quality heat energy, a large amount of low-quality heat energy at the end cannot be recovered and dissipated and wasted; when stored as low-quality heat energy, the waste of end dissipation is solved, but it increases the difficulty and cost of low-quality heat energy utilization

[0007] As for the waste heat power generation system, since electric energy is the most convenient high-quality energy source for energy utilization, traditional waste heat power generation systems usually use steam turbines to convert the pressure energy of high-pressure steam into power to drive generators to generate electricity. The steam at the end is condensed into water and returned to the boiler return water system. A large amount of latent heat of condensation generated during the condensation process of the end steam is taken away by the cooling tower and dissipated. This heat usually accounts for more than 50% of the total heat, which is the main reason for the low efficiency of traditional thermoelectricity

[0008] To sum up, the traditional slag treatment method has the disadvantages of waste of water resources, low heat recovery efficiency, poor production stability, and low product quality; The heat energy waste at the end of the steam turbine waste heat power generation system is serious, and the heat-to-electricity conversion efficiency is extremely low

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