Anti-blockage rotary hearth furnace smoke processing system and method

Abstract

The invention provides an anti-blockage rotary hearth furnace smoke processing system and method. The anti-blockage rotary hearth furnace smoke processing system comprises a smoke inlet (11), a vertical flue (1), a forcing evaporative cooling device (3), an air heat exchanging device (5), a secondary cooler (9), a cloth bag dust removing device (12) and an exhaust port (13), all of which are connected in sequence. According to the anti-blockage rotary hearth furnace smoke processing method, the temperature of the smoke inlet (11) is set to be 1,200 DEG C or higher, smoke enters the vertical flue (1) from the smoke inlet (11) to enter the forcing evaporative cooling device (3) along the flue so that one-level cooled smoke with the temperature controlled to be 600 DEG C or higher can be obtained; the one-level cooled smoke enters the air heat exchanging device (5) to be cooled, and two-level cooled smoke with the temperature of 300 DEG C or higher is obtained; the two-level cooled smoke enters the secondary cooler (9), and three-level cooled smoke with the temperature ranging from 150 DEG C to 190 DEG C is obtained; the three-level cooled smoke is exhausted out of the exhaust port (13) after entering the cloth bag dust removing device (12).

Description

technical field [0001] The invention relates to the technical field of high-temperature flue gas treatment, in particular to an anti-clogging rotary hearth furnace flue gas treatment system and method. [0002] Background technique [0003] In the process of steel production, a large amount of waste sludge is inevitably produced. The company produces about 100kg of dust sludge per 1 ton of steel produced, and the harmful elements such as zinc, potassium, iron, lead, and sodium contained in these dust sludge, Direct discharge will cause serious pollution to the environment, requiring further recycling and dust sludge treatment. The traditional dust sludge treatment method is mainly low-Zn dust sludge sintering treatment, high-Zn dust sludge export or landfill, this treatment method not only cannot realize the rational utilization of useful elements in the waste sludge, but also causes blast furnace nodules, Difficulty cleaning etc. With the increase of iron and steel smelt...

AI Technical Summary

Problems solved by technology

Although this kind of flue gas treatment system can realize basic flue gas recovery and utilization treatment, due to the frequent blockage of high-temperature flue gas passing through the waste heat boiler and heat exchanger, it has to be shut down for maintenance frequently, which seriously affects the continuous production of the rotary hearth furnace.

[0006] The blockage of the flue gas system has caused a series of consequences to the production and operation of the rotary hearth furnace: the blockage of the flue gas system has caused positive pressure in the rotary hearth furnace, further leading to gas overflow, destroying the reducing conditions in the rotary hearth furnace, and equipment operation, safety In particular, the adhesives that cause the blockage of the flue gas system of the rotary hearth furnace are highly viscous, corrosive and water-absorbent, and combine with zinc oxide dust to form a dense substance, which is difficult to clean and the equipment is easily damaged, which may easily cause poisoning of cleaning personnel

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