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Principle of activated coke dry desulfurization

Many big holes (> 50mm), medium holes (2.0~50nm) and a few small holes (< 2nm) exist in coherent form in activated coke. Activated coke (AC) adsorbs pollutants either physically or chemically. Physically, its large porous specific surface area helps to intercept pollutants in flue gas and its micropore in comparable size to molecular radius limits pollutant molecules within AC. Chemically, defective C atoms, oxygen-containing functional group and polar surface oxides on AC surface fix targeted pollutants to the internal surface of AC


Composition of Activated Coke Dry Desulfurization System

The Activated Coke Dry Desulfurization System is composed of flue gas system, adsorption system, desorption system, AC storage and transfer system and sulfur recovery system.The Activated Coke Dry Desulfurization System is composed of flue gas system, adsorption system, desorption system, AC storage and transfer system and sulfur recovery system.


Flue gas homogenization device for convection adsorber for activated coke dry desulfurization

This flue gas homogenization device is at the core of convection adsorber, enabling even flow of flue gas in the adsorption layer, carrying AC and discharging saturated AC evenly and smoothly. It improves AC utilization rate and guarantees FGD efficiency. This technology greatly improves AC utilization rate and reduces the amount of AC recycled. It makes the system more adaptable by using ingeniously saturated AC to intercept dust in flue gas. The AC adsorption layer is highly flexible and adjustable to deal with variation of SO2 concentration in flue gas. The adsorber has a modular design and is able to adapt to boiler load variation by opening/closing units flexibly. It also allows unit maintenance under load, contributing to safe and stable operation of generator units in the power plant.


Desorber for activated coke dry desulfurization

The desorber system plays a critical role in the whole system by desorbing SO2, HCI and HF from saturated AC through heating so that AC can be reused. The desorber is designed with nitrogen filling technology to effectively prevent AC oxidation during desorption, with pressure gradient to prevent desorbed AC from adsorbing SO2 again, and with gas mass transfer disturbance technology to save energy by improving heat exchange efficiency.


Application of activated coke dry desulfurization technology 

The activated coke dry desulfurization technology is not just a desulfurization technology, but can also remove HCL, HF, dust, mercury, arsenic, other heavy metals and macromolecular organic matters such as dioxin in flue gas and remove NOx if equipped with ammonia spraying device. It is an efficient way to purify flue gas. Its byproducts, which can be turned into useful resource, can ease China's shortage of sulfur resource, dependence on import of sulphur ore and foreign monopoly of sulphur and coproduct prices.

China is among countries in the world suffering from water shortage, especially in its north where the development of power industry is restricted by water shortage. In 2004 National Development and Reform Commission issued a Notice of Requirements for Planning and Construction of Coal-fired Power Plants (FGNY [2004] No. 864), making it clear that "Dry/semi-dry FGD technology must be used for coal-fired power plants in water-deficient areas". So SPC conducted widespread researches of dry/semi-dry FGD technologies at home and abroad. The research results show: The FGD technology based on dry activated coke method virtually requires no water but AC made from coal and produces no secondary pollutants such as wastewater and solid wastes. This meets the state's industrial policy and environmental requirements. With strong support from the government and power generation companies, we believe this green, water-efficient flue gas purification technology will thrive in China.