Heat exchange set for flue gas waste heat recovery

Abstract

A heat exchange set for flue gas waste heat recovery comprises a flue gas inlet, a heat-accumulating temperature homogenizer, a flue gas passage, a heat pipe bank, a flue gas outlet, an ash hopper, a circulation pipe, a steam drum and a steam accumulator. The heat exchange set is characterized in that the top of the flue gas passage is provided with the flue gas inlet, the outside of the bottom of the flue gas passage is provided with the flue gas outlet, the bottom of the flue gas passage is provided with the ash hopper, the heat pipe bank is disposed within the flue gas passage and is connected with the steam drum through the circulation pipe, the steam drum is connected with the steam accumulator through a pipe, the steam drum is disposed on the top of the outside of the flue gas passage, the heat-accumulating temperature homogenizer is disposed at the upper end of the heat pipe bank in the flue gas passage, the heat-accumulating temperature homogenizer comprises carbon-carbon composite accumulating members and a shock wave ash-remover, and the shock wave ash-remove is disposed among the carbon-carbon composite accumulating members segment by segment. The heat exchange set has the advantages that heat in the flue gas can be recovered to the maximum extent, investment on waste heat utilization equipment is lower and the waste heat utilization equipment is more stable.

Description

technical field [0001] The invention relates to a waste heat utilization device, in particular to a heat exchange device for recovering flue gas waste heat, and belongs to the technical field of flue gas waste heat utilization. Background technique [0002] The iron and steel industry consumes a large amount of energy every year, and the high-temperature flue gas generated during the smelting process and the heat dissipation of equipment take away a large amount of energy. Due to the high temperature of the flue gas from submerged arc furnace steelmaking, the temperature entering the pipeline after being captured is generally around 1300°C, and the temperature of the flue gas fluctuates violently, with a large dust content. Waste heat recovery from furnace flue gas. During a smelting cycle of submerged arc furnace, the flue gas temperature fluctuates greatly, usually rising from 110°C to 1300°C, and then dropping to 110°C. Ordinary heat pipe steam generators cannot fully a...

AI Technical Summary

Problems solved by technology

[0004] 2. The waste heat recovery system is complex, and other cooling equipment must be used to reduce the flue gas temperature to below 800°C

[0005] 3. Alternating changes in flue gas temperature lead to a decrease in the strength of the pressure components of the heat pipe steam generator, which is prone to leakage

However, the actual steam output is far lower than the maximum evaporation capacity of the waste heat recovery equipment, resulting in the situation of large horses and small carts

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