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Uhde
Uhde
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The uhde® entrained-flow gasification process with direct quench (PDQ) is an optimized design of the proven PSG gasification process for chemical applications (e.g. ammonia, methanol, hydrogen, synthetic fuel) and IGCC plants with carbon capture and storage (CCS), where hydrogen-rich syngases are required. Here, the technologically advanced dry feed system, multiple burners and membrane wall of the uhde® entrained-flow gasification process with steam generation (PSG) are combined with a proprietary water quench system which saturates the raw syngas with water for subsequent gas treatment.
Capital-intensive systems, such as the waste heat boiler system, the dry fly ash removal system and the quench gas compressor, are therefore no longer required.
INPUT: feedstocks with low ash content or low ash softening point.
OUTPUT: Hydrogen-rich syngas for chemical applications, such as ammonia, methanol, synthetic fuels, or electrical power with carbon capture and storage/utilization (CCS/CCU).
up to 1,200 MWth single train capacity
Process data
Gasification pressure: 40 bar and higher
Gas temperature at outlet of gasifier quench: 200-250 ℃
Carbon conversion: > 99%
Typical raw gas composition:
CO2 + H2 > 81 vol.%
CO2: 6-8 vol.%
CH4 < 0.1 vol.%
Entrained-flow
Dry fust feed for high efficiency
Multiple burners with high availabiltity and life time
Horizontally arranged burners for high carbon conversion
Membrane wall with a long lifetime
Full water quench for syngas saturation
Shorter supply and construction schedule
Lower investment cost
Operates above ash melting point
First, the feed dust is prepared in the feed preparation unit. Approximately 80% of the dust is smaller than 0.1 mm. This feed dust is then gasified in the uhde® entrained-flow gasifier using oxygen and steam as the gasification agent. The gasification temperature is higher than the ash melting temperature, which allows the feedstock to be removed as slag. The cooled-type gasifier is equipped with multiple, horizontally arranged burners.
The raw gas produced, which contains mainly carbon monoxide and hydrogen, is quenched with water in the gasifier direct quench and then cleared in a scrubber.
The filter cake from the slurry filtration system is mainly recycled to the gasifier via the feed preparation unit.
The slag from the gasifier can be used as a construction material.
The uhde® entrained-flow gasification process with direct quench is used in Bionext's BioTfueL® plant for advanced biofuels in Dunkirk, France.
The uhde® entrained-flow PDQ process is an optimized design of the proven uhde® entrained-flow PSG process for the production of chemicals where partial or complete CO-shift of the generated syngas is required.
The gasification chamber, the membrane wall and the burner setup is identical to the PSG version, the only modification is the replacement of the cost-intensive heat recovery sections by a full-water quench system.