CFS™ Flue Gas Desulphurisation System                                     

                                    - A New Technology Break-through System For FGD

Recently, our scientists and engineers have improved our De-SOx/Dust System, CFS™ Flue Gas Desulphurisation (FGD) System, on the basis of modern technology, the principle of aerodynamics and our extensive industrial experiences and latest research findings. This latest technology can provide the best solution for the removal of SOx /Dust of coal-fired power plants, iron and steel companies, and other industries. 

CFS™ FGD System has focused on the development of key elements, which dominates the efficiency of the SOx removal.  With our advanced CFS™ FGD systems, rather than droplets with 3 mm in diameter of conventional spraying devices for FGD, we have created a new spraying system which can produce much smaller sized droplets, having 100~200 µm in diameter. 

The factors which are contributed to the performance of an FGD are: 

  • For a certain gas volume, an increase in contact surface areas of gas-liquid cannot be just simply achieved through increase of the quantity of absorbent liquids for improving the removal efficiency of SOx. This should be more economically obtained through a good quality of atomizing the liquids via an advanced atomization technology, which will increase the number or density of droplets tremendously to increase the contact surface areas of gas-liquid;
  • Ultra fine liquid droplets filling in the tower will lead to greater coverage in the cross section of the absorbing areas, will make the most effective use of the absorbents, and will certainly result in gaining high efficiency of  De-SOx/Dust;  
  • A droplet breaking up will generate 8 times of the number of droplets with half of its original size. So a droplet in millimeters breaking up will lead to hundreds of thousands of droplets in micrometers, which dramatically increases the contact surface areas of gas-liquid, certainly saving a lot of water and absorbents; 
  • Charged droplets will have a super absorbing or collection efficiency on gases and fine particles. 

On the basis of the above factors, the core part of CFS™ FGD system is its spraying and charging systems. Rather than a pneumatic or centrifugal atomization of liquids, a hydrostatic atomization of liquids is implemented to simplify engineering processes and minimize troubles for dealing with large volumes of gases treated. A specific range of droplet sizes, about 150 µm in diameter, can be optimized through controlling of the scrubbing liquid flow rates and pressures, and spraying nozzle diameters, producing a significant amount of charge on droplets at a voltage of about 15,000-20,000 volts. As droplets will have the same polar charges, they repel each other to achieve the smallest possible droplets of scrubbing slurry, and this also minimizes the possibility of small droplet becoming larger due to collision. 

Along with our new spraying system, we have also developed a new kind of perforated plates, on the basis of modern aerodynamics, to achieve a better gas condition in the absorbing tower. This reduces the pressure drops of the tower, and leads to a result of increasing the efficiency of SOx removal. 

In CFS™ FGD System, just water or waste water is used to scrub acid gases such as SO2 or alkaline gases such as NH3, where charged water droplets play the role of absorbing gases. Alkaline solutions/substances or acid solutions/substances are added to neutralize the absorbed matters in the sump of the bottom of the tower. Due to this feature, neutralizing reagents could be changed according to the local resources and needs of byproducts without much changing of the existing FGD equipment and processes. This is distinguished greatly with the conventional FGD technologies. 

As CFS™ FGD System has an excellent collection performance on submicron particles, it will save a lot of money for reformation of the existing ESP or baghouse which has a dust collection efficiency lower than the requirements.  In contrast, if an ESP is used as the dust collection device, as the particles escaped have some charges on them, if the droplets produced by CFS™ have charges on them opposite to the sign of the particles from ESP, then the particles and the droplets will be attracted to each other, which results in a very high collection efficiency of fine particles. This will save up to millions dollars for reformation of the dust collection device or a low collection efficiency of ESP can be used to save large investment.

 Using CFS™ FGD System to De-SOx/Dust, a plume which contains small particles and aerosols will normally not occur from the cleaned gas.  This is particularly suitable to deal with desulfurization of exhausts from iron ore sintering process in iron and steel industries where a large quantity of waster ammonia water are generated and can be used as reagents without significant problems of aerosols coming out from the stack. So ammonia can be used as reagents for desulphurization of flue gases from coal-fired boilers by retrofitting our CFS™ FGD System to produce saleable by-products of ammonium sulphate. Traditional limed based FGD system will generate gypsum which is normally of disposal and deemed as secondary pollutants. Our CFS™ FGD System can better realize cyclic economy for a sustainable development. 

This innovative technology will just need 1/5-1/10 of liquid-to-gas ratio of the conventional wet FGD technologies, and save a lot of operation costs. Compared with the traditional technologies, CFS™ FGD System requires less consumption of energy, meaning a reduction of CO2 emissions from another point of view. Hence, implementation of our technology will certainly generate significant benefits of "Energy-saving and emission reduction" and "low-carbon economy". 

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