Device and method for monitoring and controlling residual carbon combustion during hot sintering mineral cooling process

Abstract

The invention relates to a device for monitoring and controlling residual carbon combustion during a hot sintering mineral cooling process. The device for monitoring and controlling residual carbon combustion during the hot sintering mineral cooling process comprises a vertical cooler, a waste heat boiler, a dust collector and a circulating fan. According to an exhaust gas flowing direction, a high-temperature gas outlet located in the upper part of a tower wall of the vertical cooler is connected to an air inlet of the waste heat boiler through a first pipeline; a second pipeline drawn from an air outlet of the waste heat boiler is connected to a low-temperature gas inlet located in the lower part of the tower wall of the vertical cooler through the dust collector and the circulating fan;and the low-temperature gas inlet communicates with an air supply device on the bottom part of a tower body of the vertical cooler. The device for monitoring and controlling residual carbon combustion during the hot sintering mineral cooling process is characterized in that a first temperature measurement device and a first flow detection device are arranged on the low-temperature gas inlet of the vertical cooler, and a second temperature measurement device and a second flow detection device are arranged on the high-temperature gas inlet of the vertical cooler. According to the device for monitoring and controlling residual carbon combustion during the hot sintering mineral cooling process provided by the invention, whether secondary combustion occurs on residual carbon during the hot sintering mineral cooling process or not can be accurately judged, and meanwhile, secondary combustion on the residual carbon is effectively controlled through a nitrogen spraying device.

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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