Combined two-stage flue gas desulfurization and dust-eliminating process

Abstract

The invention relates to a composite two-stage flue gas desulfurization and dust removal purification process for efficient desulfurization and dust removal of dust-containing and sulfur-containing high-dense phase flue gas. It consists of the front part and the first and second parts; the front part is a ceramic multi-tube dust collector or electrostatic precipitator, which performs a first-level dust removal on the flue gas and removes 90% to 99% of the dust in the flue gas; the first part is Venturi In the drying absorption tower, the sulfur dioxide in the flue gas reacts with the desulfurization liquid and is absorbed to realize primary desulfurization; the second part is a bag type desulfurization dust collector, which removes the desulfurization reaction products and performs secondary dust removal on the fine particles in the flue gas; The sulfur dioxide gas that has not been removed from the flue gas realizes two-stage desulfurization; the advantages of the invention are: simple process flow, optimal matching combination of equipment, low calcium-sulfur ratio, high desulfurization and dust removal efficiency, small system footprint, and less maintenance workload , Low operating costs and so on. The induced draft fan does not carry water and sticky dust, the exhaust gas temperature is high, and there is no steam "white fog" phenomenon. The desulfurization product is dry powder, which is convenient for storage, transportation and comprehensive utilization.

Description

Technical field: [0001] The invention relates to a composite two-stage flue gas desulfurization and dust removal purification process suitable for coal-fired furnaces and high-dense phase flue gas containing dust and sulfur. Background technique: [0002] The current flue gas desulfurization and dust removal process is divided into wet method and dry method. Calcium substances are mostly used as desulfurizers. The wet flue gas desulfurization and dust removal process is to remove dust and purify the flue gas first, and then the flue gas containing sulfur dioxide performs mass transfer and heat exchange with the alkaline aqueous solution containing calcium hydroxide in the absorption tower to remove sulfur dioxide in the flue gas. The wet flue gas desulfurization and dust removal process includes a circulating water system, a sewage concentration system, an ash-water separation system, a moisture-containing product treatment system, and a desulfurizer preparation system. Th...

AI Technical Summary

Problems solved by technology

Because the dry flue gas desulfurization and dust removal process belongs to the mass transfer between solid powder particles and gaseous flue gas, the efficiency of mass transfer and absorption is low

At the same time, when the solid powder desulfurizer reacts with the sulfur dioxide in the flue gas, the surface of the powder particles is first adsorbed and saturated, which increases the resistance of the reaction between the inner core of the powder particle and the sulfur dioxide, so that the solid powder desulfurizer cannot completely react with the sulfur dioxide in the flue gas. respond adequately

Even if the technical measures of repeated use of desulfurization agent are adopted, the utilization rate of desulfurization agent can only be partially improved, but the desulfurization efficiency cannot be improved

Therefore, the current dry flue gas desulfurization and dust removal process has low desulfurization efficiency and large calcium-sulfur ratio, which increases the consumption of desulfurizer and increases the operating cost

At the same time, the nozzle pipeline system wears a lot, and the maintenance workload increases

Images