METHOD FOR PREPARING LIQUID HYDROCARBON PRODUCT FROM BIOMASS-PRODUCED SYNTHETIC GAS

摘要

Provided in a method for preparing a liquid hydrocarbon product from a biomass-produced synthetic gas, specific steps are as follows: 1) mixing a crude synthetic gas produced by a reaction in a biomass gasifier with a hydrogen-rich gas, where the volume ratio of the hydrogen-rich gas to the crude synthetic gas is between 0.7 and 2.1; 2) feeding the gaseous mixture acquired in step 1) into a dehydration apparatus to remove the moisture, carbon dioxide, and other hazardous impurities contained in the gas, acquiring a synthetic gas meeting the requirement of a Fischer-Tropsch synthesis reaction; 3) reacting the synthetic gas acquired in step 2) into a Fischer-Tropsch synthesis reactor, where the Fischer-Tropsch synthesis is a process catalyzed with a high efficiency Fischer-Tropsch synthesis catalyst to produce the liquid hydrocarbon product, where the temperature is between 150°C and 300°C, and where the pressure is usually between 2 and 4 MPa(A), producing the liquid hydrocarbon product, and discharging water generated from the apparatus, where the volume ratio of H2/CO of the Fischer-Tropsch synthesis raw material gas introduced into the Fischer-Tropsch synthesis reactor is between 1.8 and 3.0, and where the H2+CO of the effective synthetic gas accounts for 50% to 99% of the total gaseous volume; and, 4) returning 70% to 95% of a discharged exhaust produced in step 3) to step 3) to be mixed with the synthetic gas and then be reacted in the Fischer-Tropsch synthesis reactor.