A Flue Gas Desulphurisation (FGD) system is a pollution control system that aims at decreasingthe exhaust of harmful SO2 to permissible limits. In many coal based power plants and industrial boilers, as a result of pet coke (or other forms of coal) burning, a residual Sulphur Dioxide SO2 is produced which is very harmful for the environment. As a result, Govt. Of India has set up a permissible limit for SO2 exhaust which is achieved by using a Flue Gas Desulphurisation (FGD) system. The FGD systems use alkali reagent for Sulphur Dioxide (SO2) removal. In addition to SO2 removal, the FGD system also treat chemicals like HCl, HF, SO3 and fly ash.
At Mago Thermal, our (NaOH Based)Flue Gas Desulphurisation system can have 98 – 99% capture efficiency.
“SIEVENT” FGD SCRUBBERfor100 %PET COKE — FIRED BOILER.
The flue gases are passed through the proposed Scrubber (combination ofVenturiandSieve Tray) at the downstream ofESPandIDFan .
提议Scrubberis designed to去硫化theFlue Gasesin three stages, namely :
CaCO3(solid) + SO2(gas) → CaSO3(solid) + CO2(gas)/
In free board zone, we sprayCa(OH)2through specially designed Nozzles. These Nozzles are placed at strategic locations in Free Board Zone to generate Dry Scrubbing action. In this zone, the SOxlevel is reduced to 3500 PPM – 5000 PPM.
Ca(OH)2(solid) + SO2(gas) → CaSO3(solid) + H2O (liquid)
Flue gases laden with1500 PPM – 2000 PPM SOxpasses through the Boiler Bank tubes, Economiser, APH etc and finally through ESP where SPM level is brought down. Partially CLEAN Flue Gases then pass through aSieve Tray Scrubber通过这NaOHsolution is sprayed to absorp balanceSOIn this zone, theSOxis brought down to less than50 PPMlevel.
2NaOH(solid) + SO2(gas) → Na2SO3（sol。）+ h2O (liquid)
Na2SO3（溶胶）+所以2(gas) + H2O (liquid)→ NaHSO3(solid)
Here onwards the Scrubbed Gases are made to pass through a set of雾消除器从清洁气体中分离雾气。
流出物从文丘里含有“Na 2 SO 3 / NaHSO3 / Na 2 SO 4”Sieve Tray Scrubberis PUMPED to Regeneration system. Regenration system consists of Mixing tank (For CaCO3 + Effluent Solution), Thickner & Vacuum Filter for Solid Recovery ( CaSO3/ CaSO4).
CaCO3(solid) + NaHSO3（sol）→na2SO3+ CaSO3。1/2H.2O (liquid) + ½ H2O + CO2
HSO3–+ ½ O2→所以4+ H+SO3=+ ½ O2→所以4=
Na2SO4+ Ca(哦)2.+ 2小时2O → 2NaOH + CaSO4。2H2O (sol)
Adequate amount of系统自动化has been considered for periodic PURGING along with field instruments to monitor the Pressure Drop and Temperature of the gas at Different Stages.
SO2 : less than 50 Ppm on continuous basis
COST OF SOX removal Shall Be Rs 0.20 / Kg of Steam generation.
We, at Mago Thermal, undertake Flue Gas Desulphurisation (FGD systems industries in Uttar Pradesh (UP), Maharashtra, Haryana, Punjab, Gujrat and other regions across India. For further details on Mago Thermal’s FGD Plants, call us or email us at marketing (at) magothermal.com