The several commonly used ignition and coal feeding methods for gasifiers were introduced. For gasifiers with a small number of units and where it is difficult and costly to separately set up a high-calorific-value backup fuel system, especially for devices that cannot be fully replaced by a fuel oil system, the use of low-calorific-value gas produced on-site or within the industrial park as a substitute for high-calorific-value natural gas, LPG, and diesel for startup fuel has been implemented. Innovations and optimizations have been made to the gasification furnace ignition and coal feeding gas system and control strategies. The implementation of this new technology has completely solved the aforementioned issues, not only saving gas costs but also reducing the construction and daily maintenance expenses of the startup gas system. Additionally, it has resolved the issue of weak flame detection signals for gasifiers operating under low-pressure conditions.