Production and use of peat coke

Jarl Brandt, Kai Sipilä, Rabbe Thun

Research output: Book/ReportReport

Abstract

The properties of peat coke are fairly similar to those of wood charcoal. A high reactivity, a porous structure and a low sulphur content are typical characteristics of peat coke. The phosphorus content of peat coke is usually high and the strength low compared to other cokes, especially anthracite coke. There are two peat coke factories in operation in the world, one in the Federal Republic of Germany (F.RG.) and the other in Finland. The German factory, owned by Inducarbon GmbH, manufactures 10 000 t/a peat coke. The capacity of the Finnish factory, owned by Vapo Oy, is 30 000 t/a peat coke, and in addition, this factory manufactures about 40 000 t/a briquettes and produces 50 000 MWh/a electricity and 20 MW district heat. Today peat coke is mainly used as a reductant in the production of ferrosilica and silica and as a raw material for activated carbon. The use of peat coke in the pro-duction of ferrosilica and silica is based on its high reactivity, which improves the economy of the process by reducing the loss of silica and the consumption of electricity. In the F.RG., peat coke has been used as the raw material for special grades of activated carbon. In Finland, barbeque coke is also produced from peat. The quality of peat coke is affected not only by the carbonization conditions, but also by the quality and pretreatment of the raw peat. The higher the degree of humi-fication, the greater the strength of both sod peat and peat coke. A higher degree of peat decomposition also results in better coke yields. A sufficiently low moist-ure content after field drying is also necessary if the sods are to withstand the mechanical stresses encountered in further processing. Peat grades with as low an ash content as possible should be chosen for the raw material. Particular attention should be paid to the contents of phosphorus and certain metals, as these components may restrict the use of peat coke in certain applications. Recently, other coking methods, developed for brown coal, have also been suggested for peat carbonization. Of these, the Lurgi-Salem method based on a hearth furnace may be worth attention. This method was originally developed for non-caking coal. Howevner, sod peat has not, as yet, been tested in this type of furnace; that is, its applicability to peat is unconfirmed.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages48
ISBN (Print)951-38-2507-8
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tiedotteita
Number542
ISSN0358-5085

Keywords

  • peat coke
  • production
  • sod peat
  • carbonization

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