Entrained-flow bed and method for recycling sulfur by reducing SO2 in desulfurization pyrolysis gas by using carbon-based material

Abstract

The invention discloses an entrained-flow bed and a method for recycling sulfur by reducing SO2 in desulfurization pyrolysis gas by using a carbon-based material. The method comprises the following steps: enabling sulfur dioxide-containing gas to enter the entrained-flow bed from a gas inlet below a venturi tube in the entrained-flow bed, accelerating the sulfur dioxide-containing gas by the venturi tube, and then enabling sulfur dioxide-containing gas to carry the carbon-based material conveyed by a powder conveying machine to form a gas-flow fluidized state; under a high-temperature condition, reducing the sulfur dioxide into the sulfur under the catalytic reduction of active coke; enabling produced gaseous sulfur to flow into a separator under the driving of a gas flow to remove solid impurities, and then enabling the gaseous sulfur to enter a reheater for initially cooling and then enter a condenser for cooling again, wherein the sulfur is condensed into liquid sulfur which is collected by a liquid sulfur collecting device, cooled gas enters a catalytic reduction device to reduce a sulfur-containing substance in the gas into sulfur, and produced waste gas is heated by the reheater and is then inflated into the entrained-flow bed for providing energy for a reduction reaction in the entrained-flow bed.

Description

Technical field

[0001] The invention specifically relates to a method of reducing SO in desulfurization gas with carbon-based materials 2 Entrained bed and method for recovering sulfur. Background technique

[0002] Coal is currently the main fossil energy source in my country. Coal contains a large amount of sulfur resources, and sulfur is an important resource in daily life and industrial production. Use SO during coal combustion 2 Form release. Currently, limestone wet desulfurization technology is widely used, and its desulfurization by-product is desulfurized gypsum. However, limestone mining causes serious environmental damage, and at the same time, the utilization rate of desulfurized gypsum is low, and a large amount of solid waste is dumped, causing secondary pollution. Activated coke dry desulfurization technology is a recyclable desulfurization technology. The saturated activated coke can be regenerated by heating or washing with water. SO 2 With sulfuric acid or li...

Images