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JOULE JOR3-CT98-0250
Combined dry removal of particles and gaseous compounds from biomass combustion off-gases in a filtration-type particle separator |
| Type of Project | Shared Cost | |
| Contract No | JOR3-CT98-0250 | |
| EC Contribution | 1,170,254 ECU | |
| Start Date | 29/05/1998 | |
| Duration | 36 Months |
Combined dry removal of particles and gaseous compounds from biomass combustion off-gases in a filtration-type particle separator
Objectives
The principal objective is the definition of process parameters and operating limits for a model dry gas cleaning system in which stable and economic particle filtration cycles can be achieved. In addition, this project aims to reduce the content of HCl, SO2, NOx, certain volatile organic species (VOCs) and metals in particulate form by simultaneous addition of sorbents and/or catalysts into the gas stream. Important objectives are the use of existing rigid ceramic filter material at regeneration pressures below 10 bar and temperatures below 600 ºC; emission targets for particles and HCl are 10 mg/m3, for SO2 50 mg/m3 and for NOx 200 mg/m3.
Technical Approach
A dry gas cleaning system for combined removal of particles and gaseous contaminants on the basis of VDI Guideline 3926, having a flow rate of 6 Nm3/h at max. 600 ºC will be designed, built and tested. It will then be used to establish filtration cycles for redispersed fly ash from biomass combustion during concomitant sorbent dosage to remove defined amounts of components. The particulate phase will be generated by dry dispersion of ashes; the gaseous components will be added by injection of defined amounts of HCl, SO2 and NOx.
Particulate removal will be based on ceramic filter elements. Vapour phase removal processes will be based on absorption or adsorption technology using NaHCO3, Ca(OH)2 or activated charcoal. Additional filtration cycle data related to the influence of water vapour will be obtained on an existing filter unit using rigid ceramic candies of 1.5m length. That unit will be modified for these tests. Additional data will be obtained to characterise the particulate and gas phases.
During the third project year, tests will be run with clean and contaminated biomass at up to 250 kg/h on an experimental incinerator. The previously designed and tested gas cleaning unit will be installed on a slip stream downstream of the incinerator to evaluated the significance of earlier obtained process parameters. Particle and gas phase as well as biomass and ash composition will be fully characterised by supporting lab data.
Expected Results
The data obtained will serve the definition of a reliable low energy demand process for combined dry removal of dust and certain vapour species from biomass combustion off-gas. It is expected that such a process-will run on the basis of existing filtration hardware with only minor additional investments to the filter unit for addition of chemicals. The process data will offer engineering firms the possibility of retrofitting existing gas cleaning systems.
Contacts
Coordinator
Participant
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