Method for improving circulating flue gas rate

Abstract

The invention discloses a method for improving the circulating flue gas rate, and belongs to the technical field of atmospheric pollutant control in the iron and steel industry. In a sintering machinesystem adopting an internal circulating production process of flue gas, a left side flue-gas-collection adjustment system is arranged on one side of a circulating gas hood to communicate with a mainrange hood bellows, a right side flue-gas-collection adjustment system is arranged on the opposite other side of the circulating gas hood to communicate with a circulating fan bellows; a plurality offlue-gas-collection hoods are separately arranged on the left side flue-gas-collection adjustment system and the right side flue-gas-collection adjustment system, adjustment valves are separately arranged on the pipelines wherein the flue-gas-collection hoods are connected with the main range hood bellows or the circulating fan bellows, pressure monitoring devices are arranged on connecting positions of the flue-gas-collection hoods and the circulating gas hood, and the opening of the pressure monitoring devices and valves of the adjustment valves are arranged to be interlocked. By opening theadjustment valves, each adjustment valve is appropriately opened when the negative pressure in the circulating gas hood reaches the condition of flue gas escape, the negative pressure in the circulating gas hood is ensured, the escape of flue gas is prevented, and the purpose of improving the circulating flue gas rate is achieved.

Description

technical field [0001] The invention relates to the technical field of material control, in particular to a method for increasing the circulation flue gas rate, which is used in a sintering machine system adopting a sintering flue gas circulation process. Background technique [0002] The amount of waste gas emitted by the ironmaking and sintering system accounts for about 40% of the total waste gas in the iron and steel industry. Exhaust gas mainly contains particulate matter, SO2, NOx, CO2, CO, dioxins and other pollutants, among which COx, SOx, and NOx emissions account for 10%, 70%, and 48% of the total emissions of the iron and steel industry. [0003] The sintering flue gas circulation production process is a sintering method that returns the flue gas generated during the sintering process to the upper layer of the sintering machine trolley for recycling. When the flue gas is circulated to the sintering layer, the NOx in the flue gas is partially degraded, and the dio...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for increasing the rate of circulating flue gas, a method for reducing the negative pressure of the circulating fume hood by using the negative pressure in the flue of the sintering machine, and solve the problem of circulating smoke in the circulating fume hood caused by negative pressure fluctuations. Gas escape problem

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