COAL CO-GASIFICATION METHOD

摘要

A coal co-gasification method, comprising the following steps: 1, fuel and a first pressurised oxygen-containing gas are injected into a gasifier, and the fuel is ignited so as to increase the temperature inside the gasifier; 2, when the temperature increase reaches a temperature capable of igniting powdered coal to be injected, injection of the fuel is stopped, injection of the first pressurised oxygen-containing gas is continued, and a pressurised carbon dioxide gas carrying the powdered coal to be injected is injected into the gasifier so as to perform powdered coal gasification; 3, once the powdered coal gasification has stabilised, coal-water slurry and an oxygen-containing gas are injected into the gasifier to perform co-gasification. The method operates stably, and overcomes cumbersome and time-consuming adjustment steps in the prior art.

主权项

1. A method for co-gasification of coal, comprising the following steps:
step 1: injecting fuel and a first pressurized oxygen-containing gas into a gasifier, and igniting the fuel for temperature rise inside the gasifier; step 2: when the temperature rise reaches an extent at which pulverized coal to be injected can be ignited, stopping injecting the fuel, and maintaining injection of the first pressurized oxygen-containing gas; and injecting pressurized carbon dioxide gas carrying the pulverized coal to be injected into the gasifier for gasification of pulverized coal; and step 3: after the gasification of the pulverized coal is stable, injecting coal water slurry and a second pressurized oxygen-containing gas into the gasifier for co-gasification.