New instruments for online measurements of alkali and tars during gasification of Biomass KENT DAVIDSSON, MOHIT PUSHP, DAN GALL, JAN PETTERSSON.

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Presentation transcript:

New instruments for online measurements of alkali and tars during gasification of Biomass KENT DAVIDSSON, MOHIT PUSHP, DAN GALL, JAN PETTERSSON

Background Gasification: heat CO2 or H2O Tars are unwanted Gaseous alkali affects the process Need for online monitoring of tars and alkali gas KOH(g), NaCl(g) … gas tar KOH(g), NaCl(g), …

Objectives Measurements in a demo-scale gasifier (GoBiGas) Long-term measurements Obtain reasonable concentrations Calibrations Response to operational changes

The GoBiGas gasifier

Extraction Instruments

Surface Ionisation e- + The process of an atom being ionised upon desorbtion from a surface. Alkali specific e- Hot surface

Surface Ionisation Detector (SID) Simple and robust technique A – Grounded detector plate B – Hot platinum filament, +400 V

Alkali and particles Startup and shutdown of GoBiGas: An submicron particle instrument and the SID connected to the extraction system. Measurement for two days.

Scanning Mobility Particle Sizer Startup Fluidisation off Fluidisation on Feedstock

SID step response Alkali concentrations during addition of K2CO3:

Alkali Aerosol Mass Spectrometer (Alkali AMS) 1. Aerosol inlet (aerodynamic lens system) inlet 3. Time-of-flight mass spectrometer ions Box-like Pt surface at 1500 K 2. Particle vaporisation and surface ionization (hot surface) 11

Alkali AMS Potassium concentration measured with Alkali AMS Total alkali concentration measured with SID Olivine addition

Volatility Tandem Differential Mobility Analyser (VTDMA) Tar KCl NaCl NaOH KOH Aerosol

VTDMA Thermal stability of particles Exp. 1 Exp. 2 Exp. 3

Conclusions Calibrated long-term measurements have for the first time been carried out with two alkali instruments and two particle instruments. Thermal stability (VTDMA) has been used to analyse alkali and tars. The methods are promising for online monitoring of large-scale gasification processes.