Thermogravimetric analysis of the Co-carbonisation of biomass-lignite blends

Benjamin Lindsey, Tim Mays

Research output: Contribution to conferencePaper

Abstract

With the one of many benefits of reduced net CO2 emissions from power stations, there is a strong motive for co-firing biomass with coal fuel. However, the impacts of co-firing on other aspects of performance (e.g. particle burnout) are not well understood. This study characterizes different coal-biomass blends by thermogravimetric anal. (TGA), deriving data to be later correlated with plant performance. Carbonisation of blends of olive kernels in Ptolemais lignite (0-100 dry-wt%), were performed in a Setaram TG-92 TGA (N2, 5 K min-1, 398 to 1200 K), fuels selected as being readily available in Europe. When compared with a rule-of-mixts. type model, the wt.-loss (TG) profiles revealed linear correlations between biomass content and wt.-loss (RMS error < 1.03 wt%). Wt.-loss rate (-dTG) data of the blends were deconvolved using five Lorentzian peaks. Carbonisation of pure olive kernels was fitted with four -dTG peaks (Tmax = 561, 594, 717 and 1058 K) and pure lignite fitted with two peaks (Tmax = 661 and 1010 K). The blend -dTG profiles retain the two lignite peaks and three of the kernel peaks; the missing kernel peak being too small to be resolved. The absence of significant addnl. TG events within the blends strongly suggests that carbonisation of blends two components progress sep. The two sets of expts. support published suggestions that co-carbonisation processes are non-synergistic. Using the Lorentz peak parameters, a highly accurate model of the blends co-carbonisation -dTG was reproduced (RMS error < 0.032 wt%). [on SciFinder (R)]
Original languageEnglish
Publication statusPublished - 2005
EventWorld Congress of Chemical Engineering, 7th - Glasgow, UK United Kingdom
Duration: 10 Jul 200514 Jul 2005

Conference

ConferenceWorld Congress of Chemical Engineering, 7th
CountryUK United Kingdom
CityGlasgow
Period10/07/0514/07/05

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Keywords

  • thermogravimetric analysis carbonization coal biomass lignite air pollution power
  • Air pollution (control
  • Combustion (cocombustion
  • Statistical analysis
  • Thermal decomposition
  • unclassified)
  • modeling thermogravimetric anal. of co-carbonization of different coal biomass lignite blends)
  • Biomass
  • USES (Uses) (modeling thermogravimetric anal. of co-carbonization of different coal biomass lignite blends)
  • Lignite Role
  • Simulation and Modeling
  • Carbonization
  • Power plants
  • Thermogravimetric analysis (modeling thermogravimetric anal. of co-carbonization of different coal biomass lignite blends)
  • NUU (Other use

Cite this

Lindsey, B., & Mays, T. (2005). Thermogravimetric analysis of the Co-carbonisation of biomass-lignite blends. Paper presented at World Congress of Chemical Engineering, 7th, Glasgow, UK United Kingdom.