Boiler system using waste heat of flue gas of rotary hearth furnace

Abstract

The invention relates to the technical field of waste heat utilization, in particular to a boiler system using waste heat of flue gas of a rotary hearth furnace, which is characterized in that a steam drum is arranged on a steel frame on the flue type heat recovery boiler, and four upper collection boxes with water-cooled walls for a hearth, four upper collection boxes with water-cooled walls for a rear flue and a lower collection box for a roof pipe are suspended under the steel frame; and the flue type heat recovery boiler adopts a vertical structure which consists of the vertical hearth and the vertical rear flue. Compared with the prior art, since the vertical flue structure is adopted by the flue type heat recovery boiler, space is occupied, the area of the occupied plane is reduced, and prospects are created for development of systems of modified or new rotary hearth furnaces which can recycle waste heat of high-temperature flue gas; and the structural layout of boiler pipes is improved, so water in the boiler can circulate naturally depending on the height difference, and the additional power and a large number of maintenance costs required for a boiler water circulating pump can be saved.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization, in particular to a waste heat boiler system for flue gas of a rotary hearth furnace developed and utilized by vanadium-titanium magnetite. Background technique [0002] The rotary hearth furnace process is a coal-based rapid direct reduction technology. Its industrial production began in the 1980s in foreign countries. On the basis of digesting and absorbing foreign technologies, my country has begun to develop and construct rotary hearth furnace devices in recent years. The rotary hearth furnace process adopts high-temperature reduction, which produces a large amount of high-temperature flue gas at 1100~1400 °C. The flue gas contains zinc dust and carbon monoxide, which means that the waste heat boiler for collecting high-temperature flue gas must meet the following conditions: 1. The function of reburning the high temperature flue gas in the furnace of the waste heat boiler; 2. P...

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Problems solved by technology

[0005] Therefore, most of the currently used rotary hearth furnace flue gas waste heat boilers are forced circulation, horizontal, and horizontal channel structures, which do not meet the special process requirements for recombustion and anti-bonding of high-temperature flue gas from rotary hearth furnaces, and are immature.

And adopt horizontal structure, horizontal passage type waste heat boiler, the required length of the boiler, occupying a large area, the existing rotary hearth furnace device or new device will be limited by the site

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