Method for removing sulfur dioxide in flue gas and used sulfur-dioxide absorbent

Abstract

The invention discloses a method for removing sulfur dioxide in flue gas. The method comprises the following steps: a solid sulfur-dioxide absorbent is arranged at a circulation area from a reactor outlet to a flue inlet in a covering manner; flue-gas flow in a reactor is discharged by a flue after passing through the sulfur-dioxide absorbent, and when the discharge of the flue gas is not up to the standard, the sulfur-dioxide absorbent is updated, wherein the sulfur-dioxide absorbent is prepared by mixing 50-80% of powdery calcium-containing substance and the balance of pasty forming agent inpercent by mass and carrying out high-temperature forming; the pasty forming agent is prepared by mixing an adhesive, granular asphalt and water according to the mass ratio of (5-10):(10-20):(15-30).The method disclosed by the invention has the beneficial effects that standard discharge of sulfur dioxide can be realized, and water is not needed, so that the problems of waste water treatment andwater-evaporation energy consumption are avoided; dust-removing facilities for collecting desulfurized products are not needed, the applicable flue-gas temperature range is wide, and the method is applicable to flue gas with the temperature being lower than calcium-sulfate decomposition temperature; the setting mode is flexible, the replacement and the operation are convenient, and a desulfurizingsystem is small in area occupation and low in investment and operation cost.

Description

technical field [0001] The invention relates to flue gas treatment, in particular to a method for removing sulfur dioxide in flue gas and a sulfur dioxide absorbent used. Background technique [0002] my country's increasingly serious air pollution and increasingly stringent emission standards have promoted the full implementation of smoke pollution emission control. According to the type of fuel, the flue gas is divided into flue gas such as coal, fuel oil, gas, etc., and according to the combustion equipment and source of flue gas, it is divided into flue gas such as power plant boilers, various industrial boilers, calciners, kilns, etc. So far, the flue gas pollution of power plant boilers has been effectively controlled, but the flue gas pollution of small industrial boilers, calciners, and kilns has not been effectively controlled, especially the sulfur dioxide pollution of small-volume flue gas. [0003] Flue gas desulfurization has been developed for more than 60 yea...

AI Technical Summary

Problems solved by technology

However, for small-scale enterprises or small-scale flue gas, such as small industrial boilers, calciners or kilns, on the one hand, the space is limited, on the other hand, funds for environmental protection are insufficient, and there is no heat recovery facility resulting in high flue gas temperature, so it is impossible to Use the above four calcium-based desulfurization technologies and other non-calcium-based wet desulfurization technologies to solve the problem of sulfur dioxide pollution