A method for temperature control in a sintering flue gas multi-pollutant treatment process

Abstract

A method for temperature control in a sintering flue gas multi-pollutant treatment process, the method comprising the following steps: 1) The sintering flue gas enters the denitrification tower after being adsorbed and desulfurized by activated carbon in the desulfurization tower, and enters the denitrification tower after being adsorbed and denitrated by activated carbon in the denitrification tower Chlorine tower, finally discharged from the dechlorination tower; 2) Activated carbon circulates between the desorption tower, screening system, denitrification tower and desulfurization tower; a detection device is installed at the entrance of the desulfurization tower to obtain the state data of the sintering flue gas at the entrance of the desulfurization tower; The state data of the sintering flue gas includes the total flow rate of the sintering flue gas and the concentration of each gas component in the sintering flue gas, so as to determine the quality of the circulating activated carbon; according to the adsorption capacity of the activated carbon for each gas and the initial concentration of each gas, calculate the sintering flue gas The temperature range when the gas enters the denitrification tower and dechlorination tower. The invention calculates the temperature range at the denitrification tower in the sintering flue gas multi-pollutant treatment process, effectively prevents the ammonium chloride crystal from blocking the flue gas circulation channel, and reduces the cost.

Description

technical field [0001] The invention relates to a temperature control method in flue gas treatment, in particular to a temperature control method in a sintering flue gas multi-pollutant treatment process, belonging to the field of sintering flue gas treatment. Background technique [0002] Hydrogen chloride is second only to SO in the steel industry 2 , NO x , dust and fluoride are the fifth largest air pollutants. Among them, sintering is the main emission source of hydrogen chloride gas in the iron and steel industry. The chlorine in the sintering process mainly comes from ore, coal fuel and flux, and its emission concentration is mostly 20-60mg / Nm 3 (in one case up to 130mg / Nm 3 above), mainly depends on the total input of chlorine. Generally speaking, for the same ore, coal and flux, the coastal areas are higher than the inland areas, because the concentration of chloride ions in the precipitation in coastal areas is high; Dust, the HCl concentration in the sinterin...

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Problems solved by technology

[0005] Aiming at the problem that the denitrification tower is prone to crystallization in the prior art, the present invention aims at the characteristics of large fluctuations in the components of sintering flue gas pollutants, combines the adsorption rules of different pollutants on the surface of activated carbon, and based on the crystallization temperature curve of ammonium chloride, the current There is a two-stage activated carbon flue gas purification process improvement and optimization, and a control method is formed to finally achieve SO 2 , NO x , Efficient and low-cost removal of HCl

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