METHOD AND APPARATUS FOR LOW-TEMPERATURE BIOMASS PYROLYSIS AND HIGH TEMPERATURE BIOMASS GASIFICATION

摘要

A METHOD AND AN APPARATUS FOR LOW-TEMPERATURE BIOMASS PYROLYSIS AND HIGH-TEMPERATURE BIOMASS GASIFICATION. THE METHOD USES A SUPER-HEATED WATER VAPOR AS AN OXIDIZER AND AN ENERGY CARRIER. FIRST, THE BIOMASS IS SUBJECTED TO A LOW-TEMPERATURE PYROLYSIS AT A TEMPERATURE BETWEEN 500 AND 800°C. NEXT, A CRUDE SYNTHETIC GAS AND COKE THUS OBTAINED ARE SUBJECTED TO A HIGH-TEMPERATURE GASIFICATION AT A TEMPERATURE BETWEEN 1200 AND 1600°C TO OBTAIN A TAR-FREE SYNTHETIC GAS. FINALLY, THE SYNTHETIC GAS GENERATED IS SUBJECTED TO A SEQUENCE OF COOLING, DUST REMOVAL, ACID REMOVAL, AND DEHYDRATION PROCESSES. THE APPARATUS CONSISTS ESSENTIALLY OF A PYROLYSIS FURNACE (5), A GASIFICATION FURNACE (9), A LOW-TEMPERATURE PLASMA TORCH HEATER (8), A HIGH-TEMPERATURE PLASMA TORCH HEATER (10), A WATER STORAGE CONTAINER (17), A WATER DELIVERY PUMP (16), AND A HEAT EXCHANGER (11). (FIGURE 1)