METHOD OF HEATING OF LONG ITEMS, SUCH AS STEEL PIPES, AND POWDER COATING POLYMERISATION IN FURNACE Russian patent published in 2015 - IPC F27B9/00 

FIELD: metallurgy.

SUBSTANCE: method involves preliminary furnace heating to a given temperature by heating source, item loading, item heating to required temperature and temperature adjustment, further coating polymerisation with further cooling, where heated gas flow is added from gas turbine motor of gas turbine power plant to flue duct in furnace chambers for item heating and in furnace chambers for applied powder coating polymerisation, direction and volume of heated gas flow proceeding to furnace chambers is adjusted automatically by draught generated by flue duct and gas turbine motor, heated gas flow temperature is adjusted to a given value. In furnace chambers for item heating, heated gas flow is directed along spiral towards external and internal surfaces of rotating item to ensure heat exchange in turbulent flow of heated gas and regular and efficient heating, while in furnace chambers for polymerisation, heated gas flow is directed to walls of furnace chambers. First furnace chamber is pre-heated, a batch of items is loaded and heated to a given temperature in the first furnace chamber, excessive volume is utilised in the second and further furnace chambers for pre-heating, and items are withheld in the first chamber to remove various corroding media that reduce adhesion strength.

EFFECT: enhanced furnace performance, efficient use of heated gas flow, boosted furnace efficiency.

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