Potential to use sorghum brewers spent grains as a boiler fuel

Musaida Mercy Manyuchi, Richard Frank, Charles Mbohwa, Edison Muzenda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The potential of using sorghum brewers spent grain (BSG) was examined for the production of bioelectricity. A local brewery company, with a production capacity of 24 tons per day of sorghum brewers spent grain as biomass waste, was used as a source of boiler fuel. After a full proximate analysis, the sorghum brewers spent grain had an average calorific value of 12.6 MJ/kg whilst coal had 19.9 MJ/kg. In addition, the BSG had a fixed carbon content of 41.6%. This indicated that it was feasible to generate electricity using sorghum brewers spent grain as a source of fuel just like coal; however the moisture content of the BSG must be controlled at minimum levels to attain high calorific values. An assumed feed rate of 1100 kg/h BSG being fed, operation at 86% efficiency, maximum pressure of 9 bars, and a steam output of 1689 kg/h were designed to supply a one megawatt (MW) turbine generator. An economic analysis was done with a total investment cost of USD$ 3.4 million, a payback period of 3.7 years, and a return on investment of 27.4%. Sorghum BSG can be provided as an alternative source of bioelectricity for the brewery industry.

Original languageEnglish
Pages (from-to)7228-7240
Number of pages13
JournalBioResources
Volume12
Issue number4
DOIs
Publication statusPublished - Nov 1 2017

Fingerprint

sorghum
Boilers
Bioelectric phenomena
Breweries
Calorific value
Coal
coal
economic analysis
turbine
moisture content
electricity
boiler
Economic analysis
Steam
Turbogenerators
industry
carbon
biomass
Industry
Biomass

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Bioengineering
  • Waste Management and Disposal

Cite this

Manyuchi, Musaida Mercy ; Frank, Richard ; Mbohwa, Charles ; Muzenda, Edison. / Potential to use sorghum brewers spent grains as a boiler fuel. In: BioResources. 2017 ; Vol. 12, No. 4. pp. 7228-7240.
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Potential to use sorghum brewers spent grains as a boiler fuel. / Manyuchi, Musaida Mercy; Frank, Richard; Mbohwa, Charles; Muzenda, Edison.

In: BioResources, Vol. 12, No. 4, 01.11.2017, p. 7228-7240.

Research output: Contribution to journalArticle

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