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HTW – High Temperature Winkler Gasification
The HTW fluidized-bed gasification process was developed in the 1920s in Germany by Fritz Winkler. Commercial-scale Winkler gasifiers were operated in over 40 applications around the world. In the 1970s, thyssenkrupp Industrial Solutions together with Rheinische Braunkohlenwerke AG commenced with the development of a pressurised version of the Winkler gasifier – the High-Temperature Winkler (HTW) gasification process. The HTW process enables shorter residence time, higher reaction velocity, higher reactor throughput for larger plant capacity, higher carbon conversion rate, higher plant efficiency and improved syngas quality.

In 1978, the HTW pilot plant started-up in Frechen, Germany. The operating experience gained therein laid the foundation for the design and construction of the HTW commercial-scale plant at Berrenrath, which started-up in 1986. The plant achieved availabilities of over 8,000 hours per year. In 1988, another commercial HTW gasification plant started-up for Kemira in Oulu, Finland. Within the further development of the HTW process for IGCC applications, and the later engineering for the KoBra IGCC plant at Hürth, an additional HTW gasification plant started-up in 1989 at Wesseling. Around the same time, the HTW plant at Berrenrath ran a programme to add up to 50 % of plastic wastes as feedstock to the gasifier. Due to the excellent results, Sumitomo Heavy Industries selected the HTW process for a municipal solid waste gasification plant that started up in Japan in Niihama in 2000. Today, HTW projects are under design and development e.g. in Scandinavia, China and India.
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