Patent ID: 11898429
Assignee: BJ ENERGY SOLUTIONS, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 17:
18. A powertrain to supply power, the powertrain comprising:
a gas turbine engine comprising:
a compressor positioned to compress air for a combustor section;
a starter assembly connected to the compressor;
a compressor turbine connected to the compressor such that the compressor and the compressor turbine rotate a first rotational speed;
a power turbine positioned such that heated combustion gas from the combustor section causes the power turbine to rotate at a second rotational speed;
a fracturing unit controller configured to generate one or more idle signals to cause the starter assembly to cause at least one of the compressor and the compressor turbine to rotate at a target idle speed while the power turbine remains at zero rotational speed; and
a transmission comprising:
an input shaft connected to the power turbine such that the input shaft rotates at the second rotational speed; and
an output shaft configured to drive a pump and positioned to be driven by the input shaft at a third rotational speed;
a brake assembly configured to at least partially control the second rotational speed of the power turbine independent from the first rotational speed of the compressor turbine; and
a controller in communication with one or more of the gas turbine engine or the transmission, the controller being configured to:
control one or more of the first rotational speed, the second rotational speed, or the third rotational speed based at least in part on one or more of a target pressure or a target flow rate associated with a fluid to be pumped by the pump, and generate one or more brake control signals configured to at least partially control operation of the brake assembly.