Method for the gasification of coal

✍ Scribed by Y. Katayama

• Publisher: Elsevier Science
• Year: 2002
• Weight: 385 KB
• Volume: 43
• Category: Article
• ISSN: 0140-6701
• DOI: 10.1016/s0140-6701(02)86191-4

✦ Synopsis

XRD, CaO peaks can be observed in raw char and CaFz peaks can be observed in demineralized char. So, it was clarified that the active species is CaO and the CaF2 cannot act as catalyst during gasification. During acid washing process, CaO reacts with HF product CaFz is the reason of the demineralized char has a lower reactivity.

02/01908 Initial operation of the PSDF transport gasifier

Smith, P. V. et al. Proceedings of the International Conference on Fluidized Bed Combustion, 2001, (16), 428438. The Power Systems Development Facility (PSDF) is an engineering scale demonstration of advanced coal-fired power systems and hightemperature, high-pressure gas filtration systems. The PSDF was designed at sufficient scale so that advanced power systems and components could be tested in an integrated fashion to provide data for commercial scale-up. One of the two processes at the PSDF is based on the Transport reactor, which is an advanced circulating fluidized bed reactor designed to operate as either a pressurized combustor or a gasifier. The reactor operates at considerably higher circulation rates, velocities and riser densities compared to a conventional circulating bed. This results in higher throughput, better mixing, and higher mass and heat transfer. The Transport reactor was operated in combustion mode for approximately 5000 h from 1996-1999 at a typical operating conditions of 1625°F and 200 psig. The Transport reactor was reconfigured for gasification operations and began operation as a gasifier in September 1999. During the initial commissioning test runs, over 450 h of gasification was achieved with three different fuels. Gasification was carried out under conditions of 1600 to 1800°F and pressures of up to 240 psig at coal rates of 2500 to 4600 lb per h. Synthesis gas heating values of 80--120 Btu/SCF and coal carbon conversions of up to 90% have been achieved. The highest heating values were obtained at the maximum coal rate. Reactor performance was limited somewhat by an inability to maintain sufficient carbon in the circulating bed due to lower than expected char retention in the reactor loop.