Dry/Semi Dry Flue Gas Desulfurization

This is an advanced semi-dry flue gas desulfurization technology based on the principle of circulating fluidized bed. The process uses dry hydrated lime powder Ca(OH)2 as the absorbent and injects process atomized water into the flue gas to increase humidity and activation of acidic substances in the flue gas. The absorbent is repeatedly circulated in a dry powder state and chemically reacts with flue gas pollutants in the absorption tower to extend the contact time between the absorbent and flue gas, achieving efficient desulfurization. Through chemical reaction, SO2, SO3, HF, and HCl in the flue gas can be effectively removed, and the final desulfurization product is a free-flowing dry powder mixture that does not cause secondary pollution and can be further utilized.

The desulfurization system mainly consists of the flue gas system, absorption tower system, absorbent preparation system, dust removal system, material return and discharge system, public system (process water, compressed air, etc.), and electrical control system.

This technology has the following features:

a) Strong adaptability to changes in the inlet SO2 concentration.

b) High desulfurization efficiency of up to 90%.

c) Dry desulfurization by-product is easy to handle; no wastewater discharge or secondary pollution.

d) Low system resistance, low operating costs, and good long-term economic performance.

e) Small footprint, simple and reliable system, and easy to control.

f) Advanced fluidized bed reaction tower design provides excellent desulfurization reaction environment and optimized gas-solid velocity ratio for temperature, humidity, concentration, flow field, ensuring the best heat and mass transfer effects.

g) The absorbent is suspended and constantly updated on the surface for high utilization and reduced CaS ratio and consumption of the desulfurizing agent.

h) The best reaction temperature in the tower is controlled by water spraying, and the absorbent is activated by secondary humidification. Multiple layers of water spraying can be set according to different flue gas volume, temperature, and humidity, and the water spraying quantity of each layer can be individually adjusted to ensure a uniform temperature field inside the reaction tower.

i) There is a flue gas recirculation system that can effectively adapt to boiler load changes and ensure a good fluidized bed effect in the tower.

Flue gas desulfurization in coal-fired power boilers, cogeneration boilers, district heating boilers, garbage incineration boilers, sintering machines, pellet kilns, coking furnaces, glass kilns, etc.

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