Effects of presence of impurities on non-equilibrium MHD power generation incorporating fossil fuel-fired heat exchanger.

概要

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A theoretical analysis has been conducted to gain an insight into the effects brought on the non-equilibrium MHD gas properties and on the performance characteristics of a non-equilibrium MHD generator by the presence of impurities introduced into the potassium-seeded argon working gas from the fossil-fuel-fired heat exchanger adopted for heating the gas. Propane is envisaged as fuel, and as typical operating condition, the working gas is assumed to have a stagnation temperature of 2, 000 K, stagnation pressure of 5 atm, Mach ' number of unity, and seed fraction of 10-3. The gas enters a Faraday-type MHD generator with infinitely finely segmented electrodes operating at a loading factor of 0.75 in a magnetic field of 5 T subject to ionization instability. The results of computation reveal that the presence of impurities below certain limits in a range of roughly 10 to 100 ppm at the entrance of the generator (exact limit depending on the operation condition) will not pre-vent the MHD generator from operating at practically useful levels of power and current densities, and that the power level will not be unduly disturbed by fluctuations in the impurity concentrations if they are below the limits referred to above. The pumping work required for evacuation is found to be less than 1% of the total output power of a dual-cycle plant.
一般社団法人日本原子力学会の論文