Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration

Sanna Tuomi, Aki Suokko

Research output: Contribution to conferenceConference PosterScientificpeer-review

Abstract

One of the most critical issues in biomass gasification based hot gas filtration is the filter blinding phenomenon at elevated filtration temperatures (above 600 °C) and pressures. The tar-laden gas has a tendency to form coke/soot on the filter. In advanced biomass gasification applications significant benefits could be gained by raising the filtration temperature. This was the main motivation for the study summarised here. The main results considering the critical filter blinding temperature at various process conditions is presented in this paper. A pressurised filtration test rig was built at VTT for studying the filter blinding phenomenon with synthetic gasification gas. The test rig consisted of an electrically heated reactor in which a ceramic fibre candle filter (alumina silicate) was mounted. The synthetic gasification gas applied in test runs consisted of three elements: gasification gas components (N2, CO, CO2, CH4, H2, steam), tar model compound and fly ash. The tar model compound consisting of toluene (90 m-%) and naphthalene (10 m-%) was fed by a liquid chromatography pump into the preheated gasification gas stream before entering the reactor. Real fly ash from CFB gasification test run was fed by a screw feeder and transported to the reactor by means of carrier gas nitrogen. The filter element was periodically cleaned by a reverse nitrogen pulse. The pressure difference across the filter element was measured. The initial test runs were performed with pure nitrogen as gasification gas. In later test runs steam alongside with other gasification gas components were introduced. In all test runs the tar and the fly ash concentration were 100 g/m3n and 9 g/m3n respectively. The filter element was operated in the temperature range of 500-800 °C at pressures 0-2 bar(g). The face velocity through the filter was kept constant at 2.1 cm/s.
Original languageEnglish
Publication statusPublished - 2011
MoE publication typeNot Eligible
EventInternational Conference on Thermochemical Conversion Science, tcbiomass2011 - Chicago, United States
Duration: 28 Sep 201130 Sep 2011

Conference

ConferenceInternational Conference on Thermochemical Conversion Science, tcbiomass2011
Abbreviated titletcbiomass2011
CountryUnited States
CityChicago
Period28/09/1130/09/11

Fingerprint

Gasification
Biomass
Gases
Tar
Fly ash
Nitrogen
Chemical elements
Steam
Filters (for fluids)
Ceramic fibers
Temperature
Liquid chromatography
Naphthalene
Soot
Coke
Silicates
Toluene
Alumina
Pumps

Keywords

  • tar
  • gasification
  • filtration
  • blinding

Cite this

Tuomi, S., & Suokko, A. (2011). Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration. Poster session presented at International Conference on Thermochemical Conversion Science, tcbiomass2011, Chicago, United States.
Tuomi, Sanna ; Suokko, Aki. / Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration. Poster session presented at International Conference on Thermochemical Conversion Science, tcbiomass2011, Chicago, United States.
@conference{85e96e04bdcd4a63878eb1e75fa70a17,
title = "Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration",
abstract = "One of the most critical issues in biomass gasification based hot gas filtration is the filter blinding phenomenon at elevated filtration temperatures (above 600 °C) and pressures. The tar-laden gas has a tendency to form coke/soot on the filter. In advanced biomass gasification applications significant benefits could be gained by raising the filtration temperature. This was the main motivation for the study summarised here. The main results considering the critical filter blinding temperature at various process conditions is presented in this paper. A pressurised filtration test rig was built at VTT for studying the filter blinding phenomenon with synthetic gasification gas. The test rig consisted of an electrically heated reactor in which a ceramic fibre candle filter (alumina silicate) was mounted. The synthetic gasification gas applied in test runs consisted of three elements: gasification gas components (N2, CO, CO2, CH4, H2, steam), tar model compound and fly ash. The tar model compound consisting of toluene (90 m-{\%}) and naphthalene (10 m-{\%}) was fed by a liquid chromatography pump into the preheated gasification gas stream before entering the reactor. Real fly ash from CFB gasification test run was fed by a screw feeder and transported to the reactor by means of carrier gas nitrogen. The filter element was periodically cleaned by a reverse nitrogen pulse. The pressure difference across the filter element was measured. The initial test runs were performed with pure nitrogen as gasification gas. In later test runs steam alongside with other gasification gas components were introduced. In all test runs the tar and the fly ash concentration were 100 g/m3n and 9 g/m3n respectively. The filter element was operated in the temperature range of 500-800 °C at pressures 0-2 bar(g). The face velocity through the filter was kept constant at 2.1 cm/s.",
keywords = "tar, gasification, filtration, blinding",
author = "Sanna Tuomi and Aki Suokko",
note = "Poster presentation; International Conference on Thermochemical Conversion Science, tcbiomass2011, tcbiomass2011 ; Conference date: 28-09-2011 Through 30-09-2011",
year = "2011",
language = "English",

}

Tuomi, S & Suokko, A 2011, 'Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration', International Conference on Thermochemical Conversion Science, tcbiomass2011, Chicago, United States, 28/09/11 - 30/09/11.

Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration. / Tuomi, Sanna; Suokko, Aki.

2011. Poster session presented at International Conference on Thermochemical Conversion Science, tcbiomass2011, Chicago, United States.

Research output: Contribution to conferenceConference PosterScientificpeer-review

TY - CONF

T1 - Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration

AU - Tuomi, Sanna

AU - Suokko, Aki

N1 - Poster presentation

PY - 2011

Y1 - 2011

N2 - One of the most critical issues in biomass gasification based hot gas filtration is the filter blinding phenomenon at elevated filtration temperatures (above 600 °C) and pressures. The tar-laden gas has a tendency to form coke/soot on the filter. In advanced biomass gasification applications significant benefits could be gained by raising the filtration temperature. This was the main motivation for the study summarised here. The main results considering the critical filter blinding temperature at various process conditions is presented in this paper. A pressurised filtration test rig was built at VTT for studying the filter blinding phenomenon with synthetic gasification gas. The test rig consisted of an electrically heated reactor in which a ceramic fibre candle filter (alumina silicate) was mounted. The synthetic gasification gas applied in test runs consisted of three elements: gasification gas components (N2, CO, CO2, CH4, H2, steam), tar model compound and fly ash. The tar model compound consisting of toluene (90 m-%) and naphthalene (10 m-%) was fed by a liquid chromatography pump into the preheated gasification gas stream before entering the reactor. Real fly ash from CFB gasification test run was fed by a screw feeder and transported to the reactor by means of carrier gas nitrogen. The filter element was periodically cleaned by a reverse nitrogen pulse. The pressure difference across the filter element was measured. The initial test runs were performed with pure nitrogen as gasification gas. In later test runs steam alongside with other gasification gas components were introduced. In all test runs the tar and the fly ash concentration were 100 g/m3n and 9 g/m3n respectively. The filter element was operated in the temperature range of 500-800 °C at pressures 0-2 bar(g). The face velocity through the filter was kept constant at 2.1 cm/s.

AB - One of the most critical issues in biomass gasification based hot gas filtration is the filter blinding phenomenon at elevated filtration temperatures (above 600 °C) and pressures. The tar-laden gas has a tendency to form coke/soot on the filter. In advanced biomass gasification applications significant benefits could be gained by raising the filtration temperature. This was the main motivation for the study summarised here. The main results considering the critical filter blinding temperature at various process conditions is presented in this paper. A pressurised filtration test rig was built at VTT for studying the filter blinding phenomenon with synthetic gasification gas. The test rig consisted of an electrically heated reactor in which a ceramic fibre candle filter (alumina silicate) was mounted. The synthetic gasification gas applied in test runs consisted of three elements: gasification gas components (N2, CO, CO2, CH4, H2, steam), tar model compound and fly ash. The tar model compound consisting of toluene (90 m-%) and naphthalene (10 m-%) was fed by a liquid chromatography pump into the preheated gasification gas stream before entering the reactor. Real fly ash from CFB gasification test run was fed by a screw feeder and transported to the reactor by means of carrier gas nitrogen. The filter element was periodically cleaned by a reverse nitrogen pulse. The pressure difference across the filter element was measured. The initial test runs were performed with pure nitrogen as gasification gas. In later test runs steam alongside with other gasification gas components were introduced. In all test runs the tar and the fly ash concentration were 100 g/m3n and 9 g/m3n respectively. The filter element was operated in the temperature range of 500-800 °C at pressures 0-2 bar(g). The face velocity through the filter was kept constant at 2.1 cm/s.

KW - tar

KW - gasification

KW - filtration

KW - blinding

M3 - Conference Poster

ER -

Tuomi S, Suokko A. Filter blinding phenomenon in pressurised biomass gasification based hot gas filtration. 2011. Poster session presented at International Conference on Thermochemical Conversion Science, tcbiomass2011, Chicago, United States.