Blast furnace smelting slag water quenching waste steam waste heat recovery system

Abstract

The present invention provides a blast furnace smelting slag water quenching waste steam waste heat recovery system. The system comprises a blast furnace slag water quenching apparatus, a slag quenching water circulation apparatus and a waste steam waste heat recovery apparatus. The blast furnace slag water quenching apparatus comprises a smelting slag groove, a water quenching apparatus and a slag discharging and conveying belt. The slag quenching water circulation apparatus comprises the water quenching apparatus, a water circulating tank, a water quenching pump and a water supplying pipe. The waste steam waste heat recovery apparatus comprises the water quenching apparatus, a three-phase separator, a fan, a heat exchanger, a hot water pump and a low-temperature user. The method of the present invention is different from the method in the prior art, wherein the recovery of the slag quenching waste water waste heat is adopted to recover the smelting slag waste heat by the method in the prior art, and the waste heat in the waste steam generated from the smelting slag quenching by the recovered water is adopted to recover the smelting slag waste heat by the method of the present invention, the water quality of the waste steam is better than the water quality of the waste water, such that the disadvantages of high hardness of the waste water, equipment scaling, equipment blocking and the like in the prior art are overcome. According to the present invention, the slag quenching waste steam waste heat is effectively recovered; the system has advantages of energy saving and emission reduction, and environmental protection; the collected waste heat can be used to meet the requirements of the low-temperature user.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery, in particular to a waste heat recovery system for blast furnace slag water quenching waste steam. Background technique [0002] In recent years, my country's iron and steel industry has developed rapidly, and iron and steel production has grown rapidly. According to data in 2010, my country's annual pig iron production has reached nearly 600 million tons. Calculated on the basis of 0.3-0.6 tons of slag per 1 ton of pig iron produced, the annual output of blast furnace slag Up to 180 to 360 million tons. The temperature of blast furnace slag is about 1500°C, and the heat contained in 1 ton of blast furnace slag is equivalent to 64kg of standard coal, so the heat carried by blast furnace slag is equivalent to 0.11-23 million tons of standard coal per year. Therefore, the recovery and utilization of waste heat from blast furnace slag has become the focus of my country's industrial energy...

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Problems solved by technology

But the disadvantage is that it still mainly uses the heat in the slag flushing water, and also absorbs the waste heat in the steam, and the first-stage heat exchanger that exchanges heat with the slag flushing water has a fatal flaw - fouling; in addition, it needs Develop a specific working medium suitable for this power generation condition. If it cannot be developed, the invention cannot be implemented

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