Reflux Circulating Fluidized Bed (RCFB) Dry FGD Technology

Reflux circulating fluidized bed flue gas desulfurization (RCFB-FGD) is an advanced dry flue gas desulfurization process based on the principle of circulating fluidized bed technology. In this process, quicklime [CaO] or hydrated lime [Ca (OH) 2] is used as absorbent, and through multiple recycling of absorbent, chemical reactions occur in the absorber in full contact with flue gas pollutants, prolonging the contact time between absorbent and flue gas, in order to achieve the purpose of efficient desulfurization, so, HF and HCI in flue gas can be effectively removed. The end product desulfurization slag is a free flowing dry powder mixture, which can be further utilized comprehensively. This process is mainly used in flue gas desulfurization of power plant boilers. The flue gas volume of single tower treatment can be used in boilers of 6MW-600MW units. So, the removal rate can reach 90%-99%. The removal rates of SO2, HF and HC are generally higher than 90%. At present, it is a method with the largest single volume processing capacity and the most comprehensive desulfurization efficiency among similar desulfurization technologies such as dry and semi-dry methods.


+ The flue gas and desulfurizer in the absorber react sufficiently, the residence time is long, and the utilization ratio of absorbent is high.

+ There are no rotating parts and fragile parts in the absorption tower, so the whole device has high availability.

+ The desulfurizer and desulfurization slag are dry state, and the system equipment will not produce bonding, blockage and corrosion.

+ When the sulfur content of coal increases or the desulfurization efficiency is required to be improved, no additional equipment is needed and only desulfurizer can be added.

+ So, the removal rate is high, the dew point of flue gas after desulfurization is low, and the equipment and flue need not be anticorrosion.

+ The load of desulfurization system can be applied in a wide range, reaching 30%-110% of the boiler load.


System Composition

+ Absorbent preparation system

+ Absorption tower system

+ Dust catcher system

+ Desulfurization Ash Recycling System

+ sprinkler system

+ Flue gas system

+ Ash conveying system


+ the removal rate of SO2 is 90% - 99%.

+ The removal rates of SO2, HF and HC were over 98%.

+ The removal rate of Hg was over 99%.

+ The desulfurization system is simple and the area of desulfurization device is small.

+ The cost of investment, operation and maintenance is low.

+ The energy consumption of auxiliary system is low.

+ No waste water discharge;

+ No need for corrosion protection;

+ Low water consumption;