Control device and method for converter smelting through CO2 and argon of rotary kiln

Abstract

The invention provides a control device and method for converter smelting through CO2 and argon of a rotary kiln. The control device comprises a rotary kiln part and a converter smelting part. An inner cylinder combustion chamber used for performing combustion to generate a heat source and an outer cylinder calcining compartment used for containing to-be-calcined limestone are arranged in the rotary kiln. A heat transmission wall is arranged between an inner cylinder and an outer cylinder. After carbon dioxide generated through calcination is collected through a preheater and a gas collecting pipe, dust removing, drying and pressurizing are carried out on the carbon dioxide, then the carbon dioxide enters pressure buffering tanks, and the clean carbon dioxide is obtained. The converter smelting part comprises a composite carbon dioxide and argon blowing control system mainly composed of the carbon dioxide and argon pressure buffering tanks, pressure detecting devices, flow detecting devices, temperature detecting devices, electromagnetic valves, adjusting valves and the like. During smelting, the respective electromagnetic valves and the respective adjusting valves are used for performing controlling, carbon dioxide blowing is carried out in the earlier stage and the medium stage, argon blowing is carried out in the later stage, and the electromagnetic valves and the adjusting valves can complement one another. According to the control device and method, the steelmaking production cost is reduced, the carbon emission and greenhouse effect can be reduced, and the control device and method conform to circular economy.

Description

technical field [0001] The invention relates to the field of metallurgy and iron and steel, in particular to a smelting control device and method for compounding carbon dioxide gas produced by indirect calcined limestone and externally supplied argon in the metallurgical industry for steelmaking converters. Background technique [0002] The 2009 Copenhagen Climate Change Symposium brought the low-carbon economy into the global focus. The low-carbon economy is an economic development model based on low energy consumption, low pollution, and low emissions. It is a fundamental change to the current production mode that consumes a lot of fossil energy and emits a lot of carbon dioxide. In 2005, it decreased by 40-45%, and was incorporated into the medium and long-term planning of national economic and social development as a binding indicator. [0003] Carbon dioxide emissions in the steel production process account for about 16% of industrial carbon dioxide emissions, and the ...

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Problems solved by technology

Because lime is mixed with fuel and burned together, the carbon dioxide produced by decomposition contains residual gas, and it is difficult to recycle the discharged carbon dioxide. Moreover, the high-temperature flue gas generated by combustion contains a lot of dust, so it is difficult to recycle, the cost is high, and the waste heat is difficult to use. At present, almost Directly discharged into the atmosphere, causing environmental pollution and energy waste, which does not meet the national requirements of circular economy and low-carbon emissions. Therefore, there is an urgent need for a pure carbon dioxide technology that fundamentally solves the separation, extraction, and low cost of calcined limestone.

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