A device and method for monitoring and controlling residual carbon combustion in the cooling process of hot sintered ore

Abstract

A device for monitoring and controlling residual carbon combustion in a hot sintering mineral cooling process comprises a vertical cooler, a waste heat boiler, a dust remover and a circulation fan; ahigh temperature gas outlet located in the upper portion of the vertical cooler tower wall is connected to an air inlet of the waste heat boiler through a first pipe in the flow direction of flue gas;and a second pipe led from the air outlet of the waste heat boiler is connected to a low temperature gas inlet located in the lower portion of the vertical cooler tower wall through a dust remover and the circulation fan. The device is characterized in that a first temperature measuring device, a first flow detecting device and an oxygen concentration detecting device are arranged at the low temperature gas inlet of the vertical cooler, and a second temperature measuring device and a second flow detecting device are arranged at the high temperature gas outlet of the vertical cooler. Whether residual carbon is secondarily combusted in the hot sintering mineral cooling process can be precisely judged, required nitrogen flow rate is calculated simultaneously, a corresponding amount of nitrogen is introduced in, and secondary combustion of the residual carbon is effectively controlled.

Description

technical field [0001] The invention relates to a device and a method for monitoring residual carbon combustion of hot sintered ore, in particular to a device and method for monitoring and controlling residual carbon combustion of hot sintered ore during cooling, and belongs to the field of sintered ore production in the iron and steel industry. Background technique [0002] The sustainable use of energy is of great importance to the survival and development of human beings, and it is one of the most important social issues facing all countries in the world. With the gradual optimization of the production process of the iron and steel industry and the continuous reduction of process energy consumption, recycling the waste heat and energy of each production process has become one of the most effective ways for iron and steel enterprises to save energy and reduce emissions. The waste heat resources carried by 1 ton of sinter ore in large and medium-sized iron and steel enterpr...

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Problems solved by technology

However, when there is air leakage in the system (especially the feed and discharge of the vertical cooling device), the oxygen content of the circulating gas increases rapidly, and the oxygen content detection device does not respond to the control system in time, it is likely to cause secondary carbon residues. Combustion, at this time, other methods are needed to judge the combustion state of residual carbon

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