System and method for adjusting concentration of combustible components in dry quenching circulating gas

Abstract

The invention relates to a system and a method for adjusting the concentration of combustible components in dry quenching circulating gas. The system comprises a coke powder cooling device and an air introduction device; and the coke powder cooling device consists of a coke powder surge bin and a coke powder cooler, and the air introduction device consists of an air supply fan, an air preheater and an air distributor. By changing the position and mode of air introduction in the dry quenching system, the working efficiency of the primary dust remover is improved, and the operation and maintenance period of the primary dust remover and the waste heat boiler is prolonged; and the carbon dissolution reaction amount of coke breeze particles in the annular air channel and the primary dust remover is reduced, and coke breeze waste heat collected by the primary dust remover is recycled, so that the economic benefit of the coke dry quenching system is improved, and meanwhile, the operation stability of the coke dry quenching system is improved.

Description

technical field [0001] The invention relates to the technical field of CDQ, in particular to a system and method for adjusting the concentration of combustible components in CDQ circulating gas. Background technique [0002] CDQ is a process that uses inert gas to cool hot coke, recover sensible heat, and has the advantages of energy saving and environmental protection. CDQ system is mainly composed of CDQ furnace, annular air channel, primary dust collector, waste heat boiler, secondary dust collector, circulating fan and other equipment and circulating air duct. In the CDQ furnace, the low-temperature circulating gas and the hot red coke flow in reverse to complete the heat exchange process, and the average temperature rises from 130°C to above 800°C, and at the same time, some gas phase components undergo carbon dissolution reactions with the red coke (such as: CO 2 +C→CO、H 2 O+C→CO+H 2 , O 2 +C→CO, etc.), resulting in combustible components (CO, H 2 etc.) concentrat...

AI Technical Summary

Problems solved by technology

When the air is introduced from the end of the annular air channel, it mixes with the combustible components in the circulating gas and undergoes a combustion reaction, releasing heat, causing the temperature of the gas to rise, the volume to expand, and the flow rate to increase, which will lead to a decrease in the working efficiency of the primary dust collector.

[0006] 2) During the movement of the powder coke particles with the high-temperature air flow, the CO in the circulating gas 2 、H 2 O undergoes carbon dissolution reaction, the longer the contact time between the two, the greater the amount of carbon dissolution reaction, resulting in unnecessary loss of economic value of powder coke and unnecessary increase in carbon emissions

[0007] 3) The fluctuation of the air intake and the combustion process will cause the fluctuation of the gas pressure in the annular air channel, resulting in the deviation of the exhaust flow at each chute of the CDQ furnace, which will affect the uniform cooling of red coke in the CDQ furnace

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