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JOULE JOR3-CT97-0220
Clean biomass staged gasifier based on new tar cracking and ash slagging techniques for efficient combined heat and power generation
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Contacts
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Electricity
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JOULE/THERMIE Programme
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Solid Biofuels
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Thermochemical Conversion
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Type of Project |
Shared Cost |
| Contract No |
JOR3-CT97-0220 |
| EC Contribution |
798,595 ECU |
| Start Date |
27/03/1997 |
| Duration |
36 Months |
Clean biomass staged gasifier based on new tar cracking and ash slagging techniques for
efficient combined heat and power generation
Objectives
The objective is the development of a new process characterised by the minimisation of the gas
cleaning part. Detailed the industrial objectives are:
- a greater tolerance towards quality of the feedstock (ash 15% and above, moisture up to 30% and
above depending on gas cleaning)
- a reduction of carbon content in the ash (98 to 99 % carbon recovery)
- a reduction of the tar in the end gases to meet standards for engine uses
- a more robust and efficient gasification set up
Technical Approach
The activities will include:
- Introduction of a new device, known as the Total Char Combustion and Tar Cracking Chamber
(TCC)2, between the pyrolysis unit and the char reduction chamber in a stage divided
gasifier. With this design, the char conversion takes place in 2 steps. The first step is the char reduction
Chamber (CRC) whose main purpose is to convert as much as possible carbon of the char supplied
directly from the pyrolysis unit into gas by means of reduction reactions. The second step takes place in
the (TCC)2 the purpose of which, with respect to the char, is to perform a complete
conversion of the remaining carbon from the CRC drain off. At the same time pyrolysis gases are
thermally cracked and residual ashes are vitrified and eliminated as slag.
- Design and implementation of a new vibrated fluidisation pyrolysis unit able to achieve an
appropriate and constant quality of char with minimum preparation of biofuel with a good phase
separation.
- The opportunity to orientate the process for gas and solid reactions by simple operating conditions
as a function of the plant requirement and market condition.
Expected Results
For all industrial partners, achievement of the objectives should result in the following benefits:
- the present costly tar cleaning set up will not be necessary
- the efficiency of the process will increase because carbon content of ashes will approach zero
- the total gasification process will become environmentally cleaner
- the elimination of operational problems arising from low melting point biomass ashes as a result of
the vitrification process
Contacts
Coordinator
Participant
