A converter gas purification and waste heat recovery and utilization system

Abstract

The invention discloses a rotary kiln gas purification and waste heat recycling and utilizing system. The problems that the gas sensible heat of an existing rotary kiln is not effectively utilized, the iron loss is serious, and the like are solved. According to the technical scheme, the rotary kiln gas purification and waste heat recycling and utilizing system comprises a rotary kiln smelting system and a rotary kiln smoke waste heat recycling, purifying and conditioning system. The rotary kiln smelting system comprises a rotary kiln and a cold material preheater located above the rotary kiln,wherein the rotary kiln is provided with a rotary kiln smoke hood and a movable hood skirt. A material outlet of the cold material preheater is connected with a material inlet in the rotary kiln smoke hood, a smoke inlet of the cold material preheater is connected with a smoke outlet in the rotary kiln smoke hood through a vaporizing cooling flue, and a smoke outlet of the cold material preheateris connected with the rotary kiln smoke waste heat recycling, purifying and conditioning system. The rotary kiln gas purification and waste heat recycling and utilizing system is simple, capable of effectively recycling the rotary kiln smoke visible heat and increasing the gas recycling amount and meanwhile capable of processing high-concentration organic waste liquid and medical garbage in a harmless manner.

Description

technical field [0001] The invention relates to the field of energy saving and environmental protection of metallurgy, in particular to a converter gas purification and waste heat recovery and utilization system. Background technique [0002] During the converter steelmaking process, the carbon in the molten iron and the oxygen blown in at high temperature generate CO and a small amount of CO 2 The mixed gas becomes converter flue gas, and the purified converter flue gas is called converter gas. The converter flue gas has a large dust content (80-150g / m 3 , the main component of the soot is ferrous oxide, accounting for more than 60%), the dust content accounts for about 1% to 2% of the charge, and the temperature is as high as 1600°C, mainly composed of iron oxide, and the rest includes oxide impurities (such as calcium oxide) and other metal oxides (mainly zinc oxide). [0003] Aiming at the mechanism of soot generation in the converter steelmaking process, Bi Xiurong e...

AI Technical Summary

Problems solved by technology

The disadvantage of the LT method is that the equipment investment is huge and the energy consumption is high; the heat energy of the flue gas at 900-1000°C cannot be effectively recycled; There are two explosion hotspots, which are safe; the open flame in the evaporative cooler has not been completely extinguished. In order to ensure the effect of evaporative cooling and dust removal, the cross section and air flow in the evaporative cooler and electrostatic precipitator have changed greatly, and the mixing process in the container has not been fully implemented. Considering that the risk of explosion is increased; the control and detection equipment is complicated, and the system maintenance workload is heavy

[0010] Regardless of wet method or dry method, the sensible heat energy of the flue gas at about 1000°C has not been effectively recovered.

At the same time, due to the discontinuity of converter smelting, the discontinuity of converter gas recovery is determined, which in turn causes the discontinuity of sensible heat recovery to bring about difficulties in the recovery process

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