Desulfurization composition, desulfurizing agent and application thereof

Abstract

The invention belongs to the field of additives for cement clinker production, and particularly relates to a desulfurization composition, a desulfurizing agent and application of the desulfurizing agent in tail gas desulfurization during cement clinker production. The desulfurization composition at least comprises a sulfur fixing agent and an oxidizing agent, wherein the oxidizing agent comprisesan oxidizing agent containing metal elements; the oxidizing agent containing metal elements is selected from one or more of a lithium-containing oxidizing agent, a platinum-containing oxidizing agent,a manganese-containing oxidizing agent, a sodium-containing oxidizing agent and a potassium-containing oxidizing agent. The actual using amount of the desulfurizing agent is small, the chemical stability is high; after a catalyst is added, the decomposition temperature of CaCO3 is reduced; CaO is rapidly generated to promote adsorption of SO2 in preheating; the goals of sulfur fixing and reduction of SO2 emission are realized; the price is low, no ammonia gas escapes, the composition and desulfurizing agent are non-corrosive, harmless, nontoxic, and non-irradiative, meet the requirements of GB4915-2013 for cement production, and avoid the phenomenon such as caking, scaling, and the like, and meanwhile, the transportation stability and thermal stability of the desulfurizing agent are good.

Description

technical field [0001] The invention belongs to the field of additives for cement clinker production, and in particular relates to a desulfurization composition, a desulfurizer and an application in tail gas desulfurization during cement clinker production. Background technique [0002] The sulfur dioxide discharged into the atmosphere during the burning of cement clinker is a serious environmental pollution. After the sulfur dioxide is oxidized in the air, it will form sulfate aerosol, which increases its toxicity by more than 10 times. After people contact and inhale these toxic gases, they can Cause cough, chest tightness, eye irritation, dyspnea and other symptoms, and even severe respiratory failure. Sulfur dioxide is not only harmful to humans and animals, but also corrodes plants and inhibits plant growth, and the acid rain produced will reduce soil fertilizer efficiency and destroy soil structure. [0003] At present, ammonia desulfurization technology and dry desul...

AI Technical Summary

Problems solved by technology

Sulfur dioxide is not only harmful to humans and animals, it can also corrode plants and inhibit plant growth, and the acid rain produced will reduce soil fertilizer efficiency and damage soil structure

Among them, the ammonia desulfurization method is to add ammonia water in the form of injection between the C2-C1 pipes in the cement kiln preheater system, and use the ammonia water and the SO in the flue gas 2 The reaction produces (NH 4 ) 2 SO 4 and (NH 4 ) 2 SO 3 ; But ammonia desulfurization has problems such as uncontrollable ammonia escape and serious equipment corrosion

Dry desulfurization is to add Ca(OH) to raw meal 2 or CaO way, enter the preheater system of the cement kiln with the raw meal, and use Ca(OH) 2 Or CaO and SO in flue gas 2 The reaction produces CaSO 4 and CaSO 3 ; but dry desulfurization directly adds calcium hydroxide or calcium oxide to the raw meal without further treatment, resulting in high operating costs, 5-8 yuan / ton of clinker, with short-term desulfurization capability, the reagent used for dry desulfurization is Powder, it is difficult to fully disperse in the flue gas system, resulting in low desulfurization efficiency, the most critical is CaSO 3 Easy to decompose above 1200℃, CaSO 3 =CaO+SO 2 , forming a sulfur cycle, it is difficult to continuously meet the emission standards, and it is impossible to finally solve the problem of sulfur emissions