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Shree Cement orders TRT Triplex dryer

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World Cement,

Kolkata-based Shree Cement has ordered a TRT 5000/8.0 Triplex dryer from Gebr. Pfeiffer to reduce the moisture content of FGD gypsum produced during flue gas desulfurisation of the company’s captive coal-fired power plant.

The FGD gypsum is used as an additive in the company’s cement production – but has a moisture content of up to 20%, limiting its usability. The planned dryer will reduce residual moisture to <2%, allowing the artificial gypsum to be processed at cement grinding plants around India.

Shree Cement’s decision to order the dryer from Gebr. Pfeiffer comes on the back of a long-standing relationship between the two companies in the field of grinding technology, as well as the technical concept of the TRT Triplex dryer, with its compact design and high efficiency.

According to Gebr. Pfeiffer, material in the TRT Triplex dryer “flows in co-current with the hot gases used for drying through the dryer. It passes through the three concentric tubes inserted one into another from the centre outwards before the dried material leaves the unit downwards and the exhaust air is led upwards to a dedusting system.”

Radiation losses are minimised due to the fact that the operating temperature of the material in the outer tube is already low and the outer surface of the three-tube dryer is only about one third of other dryer systems.The energy balance is further optimised by the possibility of recycling the cleaned exhaust air as secondary air in hot gas generation.

The new 50 tph dryer will be installed at the end of 2018 to go into operation in spring 2019.

It is also planned to partially calcine the gypsum. Tests conducted at the Pfeiffer test station produced positive results in this respect. Further installations at other cement plants will be considered after the successful testing of the first installation.

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