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RATES OF REACTION AND PROCESS DESIGN DATA FOR THE HYDROCARB PROCESS
Citation:
Steinberg, M., A. Kobayashi, AND Y. Dong. RATES OF REACTION AND PROCESS DESIGN DATA FOR THE HYDROCARB PROCESS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/020 (NTIS PB93-155976), 1993.
Impact/Purpose:
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Description:
The report provides experimental and process design data in support of studies for developing the coprocessing of fossil fuels with biomass by the Hydrocarb process. The experimental work includes the hydropyrolysis of biomass and the thermal decomposition of methane in a 2.44 m long tubular flow reactor with a 25.4 mm inside diameter. The rates of reaction and conversion were obtained at temperature and pressure conditions pertaining to a Hydrocarb process design. A process simulation computer model was used to optimize the process configuration and obtain energy and mass balances. Multiple feedstocks were evaluated, including biomass with natural gas and biomass with coal. Additional feedstocks (including sewage sludge and digester gas) were evaluated for a pilot plant unit. Under conditions of rapid heat up, high temperatures, and high hydrogen pressure, hydrogasification of biomass is especially effective in producing carbon monoxide and methane An overall conversion of 88-90 wt % of biomass was obtained. At 800 C and 51 atm (5166 kPa) pressure, the initial rate of biomass conversion to gases is 92,% per min. The reaction rate of methane decomposition in the same tubular reactor was investigated at between 700 and 900 C, with pressures from 28 to 56 atm (2836 to 5673 kPa).