Zinc oxide desulfurization

Process principle: use the metallurgical industry's own zinc oxide dust for desulfurization, and recycle the desulfurization by-products. Process classification: Oxidation process: This process uses air to forcibly oxidize the desulfurized slurry to oxidize the desulfurized product to zinc sulfate. After purification, the zinc sulfate solution is used for electrolysis of metal zinc, or concentrated and crystallized to produce qualified zinc sulfate heptahydrate or zinc sulfate monohydrate products. Thermal decomposition process: this process is that the product after the desulfurization mainly enters the sediment, and after the solid-liquid separation, the sediment and the zinc iron ore are sent to a boiling furnace or a rotary kiln is used for thermal decomposition, and high-concentration SO is produced for acid production, and regenerate zinc oxide.

Furnace desulfurization

The CaCO3 powder is sprayed into the furnace through pneumatic ash conveying, and the CaCO3 is decomposed and calcined into CaO, and then reacts with SO2 in the flue gas to generate CaSO4, which is discharged with the slag.

Calcium-calcium double alkali desulfurization

Using alkaline calcium-based compounds as desulfurizers, mainly including quicklime, slaked lime, limestone, white mud (the main component of calcium carbonate), and the waste residue in the production process of Glauber's salt (the main component of calcium carbonate), etc. through pulping spray and flue gas. SO2 in the reaction occurs to achieve the purpose of desulfurization.

Semi-dry desulfurization

The semi-dry desulfurization process means that the desulfurizer is added in a wet state, and the moisture in the slurry is evaporated by the sensible heat of the flue gas. During the drying process, the desulfurizer reacts with the sulfur dioxide in the flue gas to form a dry powder product. In order to improve the desulfurization efficiency, lime powder is usually used as a desulfurizing agent. If the bag filter is used together, the desulfurization efficiency can be improved by 10% to 15%.

Calcium-calcium double alkali method & zinc oxide method compatible process desulfurization

For the lead and zinc industry, our company has developed a new compatible process combining calcium-calcium double-alkali method and zinc oxide method for desulfurization. This process is compatible with the above two processes and has the advantages of both processes. Scope of application: Enterprises that have their own zinc oxide fume and dust, but the amount of fume and dust is insufficient.

Ammonia desulfurization

Ammonia desulfurization 2017-03-3111:37:05 Source: Qingyuan Energy Environmental Technology Co., Ltd. Process principle: Ammonia desulfurization is based on ammonia (waste ammonia), liquid ammonia (gas ammonia), urea, ammonium bicarbonate and other ammonia-containing substances as desulfurization The main by-product is nitrogen fertilizer, and the desulfurization facility does not produce secondary pollution. The basic technical principles are as follows:

Selective non-catalytic reduction of NOx (SNCR)

Process principle: The urea/ammonia water is injected into the area where the flue gas temperature is 850~1100℃ as a reducing agent, and the nitrogen oxides (NOX) in the flue gas are reduced to harmless nitrogen (N2) and water (H2O) The chemical reaction formula is: NO+CO(NH2)2+1/2O2→2N2+CO2+H2O Urea 4NH3+4NO+O2→4N2+6H2O Characteristics of ammonia water system: Denitrification efficiency is 35%~65% Construction investment cost Lower scope of application: Flue gas denitrification in small and medium boilers, cement plants, iron and steel plants, glass kilns, power plants, etc. Typical project: Luzhou Lanliang Cement Co., Ltd. 2000t/d clinker new dry process rotary kiln cement production line flue gas denitrification project (SNCR-ammonia)

Selective Catalytic Reduction (SCR)

The reducing agent ammonia (NH3) is injected into the independent reactor area with a flue gas temperature of 280~420 °C, and under the action of the reactor catalyst, the nitrogen oxides (NOX) in the flue gas are reduced to harmless nitrogen ( The process of N2) and water (H2O), the chemical reaction formula is: