Method and system to control the methane mass flow rate for the production of liquefied methane gas (lmg)
AssigneeRtj Technologies Inc.
InventorsCharles TREMBLAY, Alain ROY, Simon JASMIN
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Abstract
The system is provided for generating a mixed methane gas feed stream using at least one source of biogas and an alternate source of methane gas. The system includes a biogas subsystem, a control device for the methane gas from the at least one alternate source of methane gas, and a vertically-extending gas mixing vessel. A method of controlling a methane gas mass flow rate of a mixed methane gas feed stream is also disclosed. The proposed concept is particularly well adapted for situations where an uninterrupted and relatively constant input of methane gas is required to ensure an optimum operation of, for instance, a LMG production plant.
Claims20
A gas supply system for generating a mixed methane gas feed stream using at least one source of biogas and at least one alternate source of methane gas, the gas supply system including:
- a biogas subsystem;
- a control device for the methane gas coming from the at least one alternate source of methane gas;
- and
- a vertically-extending gas mixing vessel having an upper biogas inlet that is selectively in fluid communication with an outlet of the biogas subsystem, at least two vertically spaced-apart mid-level gas inlets that are each selectively in fluid communication with the control device for the methane gas coming from the at least one alternate source of methane gas, a bottom condensate outlet, and a mixed methane gas feed stream outlet that is located vertically above the mid-level gas inlets.
A method of controlling a mixed methane gas feed stream, coming from at least one source of biogas and an alternate source of methane gas, to supply a Liquefied Methane Gas (LMG) production plant, the method including:
- receiving biogas from the at least one source of biogas as a primary source of methane gas;
- measuring biogas pressure and a methane gas concentration in the biogas received from the at least one source of biogas;
- supplying the biogas in a gas mixing vessel;
- measuring the pressure immediately at an outlet of the gas mixing vessel;
- and
- supplying methane gas from at least one alternate source of methane gas inside the gas mixing vessel so as to counterbalance a missing methane gas fraction in the biogas and in response at least in part of at least one among the measured biogas pressure and the methane gas concentration in the biogas received from the at least one source of biogas, wherein the methane gas content in the mixed methane gas feed stream coming from the at least one source of biogas and the methane gas content in the mixed methane gas feed stream coming from the at least one alternate source of methane gas can each vary in a proportion between 0 and 100% vol. of the mixed methane gas feed stream.
Dependencies are inferred from the claim text.