Combustion-Gas Supply System and Method Thereof, Device Equipped with Turbine Engine, and Fracturing System

A method for operating a combustion-gas supply system comprising a first sub-pipeline, a second sub-pipeline, and a multi-functional pipeline connected in tandem, the first sub-pipeline comprising a first gas intake pipe, a first gas supply valve and a first gas outlet pipe arranged in sequence, the second sub-pipeline comprising a combustion-gas supply valve and a gas supply pipe, the first gas outlet pipe being connected with the combustion-gas supply valve and the gas supply pipe being configured to be connected with a turbine engine, the multi-functional pipeline comprising a second gas intake pipe, a second gas supply valve and a second gas outlet pipe arranged in sequence, the second gas outlet pipe being communicated with the first gas outlet pipe, and the method comprising:

• before supplying combustion-gas via the combustion-gas supply system, turning on the second gas supply valve, and introducing first high-pressure gas into the first sub-pipeline through the multi-functional pipeline, to test pressure of the first sub-pipeline;
• supplying the combustion-gas to a load;
• and
• after supplying the combustion-gas, turning on the second gas supply valve, and introducing second high-pressure gas into the first sub-pipeline through the multi-functional pipeline, to discharge residual combustion-gas in the first sub-pipeline from the first gas intake pipe.