A method for preventing sticking of flue gas system in rotary hearth furnace for metallurgical zinc-containing dust and sludge process

Abstract

The invention provides a bonding preventing method of a smoke system of the rotary hearth furnace process for treating metallurgical zinc-bearing dust, and belongs to the technical field of high-temperature smoke treatment. The rotary hearth furnace smoke system comprises a settling chamber, a heat recovery boiler, a first cooling device, low-temperature heat exchangers, a secondary cooling device, a cyclone dust collector, a bag-type dust collector, an induced draft fan and a chimney. According to the bonding preventing method, smoke is rapidly cooled within a temperature interval that easily causes bonding by the cold air blending method, and smoke within the temperature interval is prevented from being contacted with the heat recovery boiler and heat exchange pipe bundles of the low-temperature heat exchangers; the low-temperature heat exchangers are that one is used and one is standby and offline overhaul is also performed, and thus the possibility that the smoke system is blocked can be minimized, the requirement on continuous running of the rotary hearth furnace for treating metallurgical zinc-bearing dust can be met, and the temperature system of the smoke system can be flexibly adjusted on line according to the change in smoke conditions.

Description

technical field [0001] The invention belongs to the technical field of high-temperature flue gas treatment, and in particular relates to an anti-bonding method for the flue gas system of a rotary hearth furnace for treating metallurgical zinc-containing dust and mud, especially for the anti-sticking method for the flue gas system of a rotary hearth furnace for treating metallurgical zinc-containing dust and mud Processing technology. Background technique [0002] A large amount of iron-containing dust and sludge will be produced in the process of iron and steel production. The dust and sludge production accounts for about 8% to 12% of the crude steel output. The amount is huge. Zinc-containing dust and sludge contain a large amount of useful elements such as Fe, C, and Zn, which must be recycled use. The current utilization methods of dust sludge in my country's iron and steel enterprises are mainly low-Zn dust sludge return to sintering, high-zinc dust sludge export or lan...

AI Technical Summary

Problems solved by technology

In the technical solution disclosed in this patent application, since the temperature range that is prone to sticking is still on the inner surface of the heat exchanger, the possibility of secondary dust attaching to the heat exchange surface cannot be fundamentally eliminated, and due to the type of dust There are many, the composition changes greatly, and the temperature range of easy bonding will also vary with the change of raw material conditions. The above scheme is difficult to realize the continuous temperature range of the inlet and outlet of the middle and low temperature heat exchangers that are prone to bonding in a wide range. Adjustment

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