| 摘要 |
PURPOSE:To provide a coal gasifier whereby the chemical energy of coal can be effectively utilized and the concentration of sulfur components in the formed gas can be lowered. CONSTITUTION:A formed gas 700a leaving a coal gasifier 1 is led to a desulfurization oven 2 in which a fluidized bed of limestone is formed. The inside of the oven 2 is divided into upper and lower fluidized layers 2B and 2A with an inside dispersing plate 22. The char 101 from the oven 1 passes hoppers 7a to 74a, is elevated in pressure and is fed to an oxidation oven 3. The CaS, etc., also leaving the oven 2 pass hoppers 70b to 74b, are elevated in pressure, and are fed to the oven 3. In the oven 3, the heat generated by the oxidation of the char 101 and the CaS, etc., 401 with air 201 and steam 300 is recovered with a heat exchanger 4 in the oven 3. The combustion gas from the oven 3 is led through a cyclone 6 to the gasifier 1. In the Fig., 10a, 10b, 10c and 10d are flow rate control means in which inert gas is utilized.
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