Economic and reliable FGD-Gypsum Dewatering

A Filter Belt Generation used all over the World

Economic and reliable FGD-Gypsum Dewatering

Although the market share of renewab le energies has risen exponentially, coal is still the base for more than 40 per cent of the world’s electricity production. In recently built plants, flue gas desulphurisation is a standard. For further processing of the herewith produced gypsum sludge effective dewatering is of paramount importance.
(ed. wgeisler - 23/8/2017)
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A Trend recognised at the right Time

An assessment that Detlev Stronczek, Head of Sales Power Plant Processing at Thyssenkrupp Fördertechnik (TKF), also shares. He states that the Vacubelt 2015 is a “state-of-the-art filter cloth which GKD, a highly innovative firm, has brought to the market”. Consequently, he too has been using this belt type in various vacuum belt filters for FGD gypsum dewatering since 2009: in the Rheinhafen-Dampf­kraftwerk Karlsruhe, Datteln 4 and Maas­vlakte (Netherlands) mineral coal power stations and in the Belchatov (Poland), Turcini (Romania) and Maritza II (Bulgaria) brown coal power stations. And he adds: “GKD not only introduced the innovative belt several years ago, but also impressed with extremely good results at competitive prices.”

A Host of operational Advantages

Good reason for him to consider using this kind of belt at the Belchatov power station, for instance. With 12 blocks, this largest brown coal power station in the world supplies a total output of 4400 megawatts of electricity. Thyssenkrupp Fördertechnik had already equipped six of the blocks in years past, four of them with complete belt filter systems and two with hydrocyclones. So it was not surprising that TKF was commissioned with equipping the 13th block which is to produce another 850 megawatts of electricity.

FGD gypsum dewatering system in Belchatov, Poland                                               
(Picture: © thyssenkrupp Fördertechnik)                                                                    


GKD Vacubelt filter belts, installed in the Belchatov FGD gypsum dewatering system
Picture: © thyssenkrupp Fördertechnik                                                                         

Three vacuum belt filters with 55 square metres of filter surface area each were installed here in 2011, all of them equipped with Vacubelt filter belts. The belt of the 2015 type impressed Detlev Stronczek immediately for several reasons: In addition to the high air flow rate and the dewatering effect optimised as a result, the polyester monofilament’s thermal resistance is particularly significant. He cites the cross-stability and smooth belt surface as another advantage, whereby the belt can be easily cleaned by spray pipes in the integrated cleaning unit. Moreover, the smooth surface texture reduces the possibility of confusion because the cloth can be applied from either side. Thanks to its extreme mechanical sturdiness the Vacubelt 2015 can be adjusted to a speed of operation in line with demand. An advantage that proves its worth with major flexibility in throughput times and nominal thickness as regards non-contract specific feeding quality for gypsum suspension in particular. The continuous density measurement immediately detects aberrant solid matter concentrations in the flue gas scrubber, the system will automatically run faster or slower in order to achieve unalteredly good results. The spreader vanes typical of TKF systems in suspension feeding also ensure uniform spreading of the gypsum suspension and unvarying dewatering efficiency even at different speeds. Belt filters equipped with Vacubelt 2015 belts reduce residual gypsum moisture permanently to under 10 percent and at Belchatov produce 45 tonnes of drier per unit per hour.

The dewatered gypsum dissolves from the belt  (Picture: © GKD)                              

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