Magnetizing roasting self-heating balancing device and method for iron ore tunnel kiln

Abstract

The invention discloses a magnetizing roasting self-heating balancing device and method for an iron ore tunnel kiln. A heat-accumulating type heat exchanger is arranged outside a tunnel kiln heating reduction zone. A high-temperature smoke inlet of the heat-accumulating type heat exchanger is connected with a smoke exhaust port of the tunnel kiln heating reduction zone. A heating reduction zone smoke exhauster is arranged at a smoke outlet of the heat-accumulating type heat exchanger. An air blower is arranged at a cold air inlet of the heat-accumulating type heat exchanger. A hot air outlet of the heat-accumulating type heat exchanger is connected with a hot wind pass-in channel arranged on the side wall of the tunnel kiln heating reduction zone through a hot wind pipeline. According to the magnetizing roasting self-heating balancing device and method for the iron ore tunnel kiln, the ratio of the quantity of exhaust smoke exhausted out of a kiln feeding end to the quantity of exhaust smoke exhausted out of the heating reduction zone is adjusted, so that the smoke exhaust temperature at the kiln feeding end of the tunnel kiln and the heat loss due to the fact that heat is taken away by the smoke are reduced; in addition, material heating with coal as fuel is achieved when the tunnel kiln does not use externally supplied gas fuel, and the smoke exhaust temperature at the smoke outlet is reduced below 250 EDG C at the same time; the energy utilization rate is increased and unit cost of iron ore magnetizing roasting is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral and metallurgy, and in particular relates to a self-heat balance device and method for iron ore tunnel kiln magnetization roasting. Background technique [0002] In the iron ore tunnel kiln magnetization roasting process, the fuel used for tunnel kiln heating is generally gaseous fuel. When the tunnel kiln is used in an area where gas fuel is scarce, the gas supply problem is difficult to solve, which limits the iron ore tunnel kiln. Popularization and application of magnetization roasting. However, when the tunnel kiln uses producer gas as fuel, it generally needs to be equipped with a gas producer. The coal gasifier uses coal as the raw material, and converts the coal into producer gas through high-temperature cracking and gasification, and then supplies the producer gas to the tunnel kiln for utilization. Due to the secondary conversion of energy in the process of fuel use in tunnel kilns, th...

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Problems solved by technology

[0005] To sum up, the main problems of iron ore tunnel kiln magnetization roasting are as follows: (1) gas fuel is needed for heating in tunnel kiln; Larger, resulting in higher energy consumption for iron ore roasting

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