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A system in one embodiment includes a mixing module, an oxidation module, and a heat exchanger. The mixing module is configured to receive and mix a boil-off gas stream from a cryotank. The oxidation module is configured to receive the mixed stream, and to oxidize the boil-off gas in the mixed strea

A system in one embodiment includes a mixing module, an oxidation module, and a heat exchanger. The mixing module is configured to receive and mix a boil-off gas stream from a cryotank. The oxidation module is configured to receive the mixed stream, and to oxidize the boil-off gas in the mixed stream to produce an exhaust stream. The heat exchanger is configured to exchange heat between streams passing through a first passage configured to receive at least a portion of the exhaust stream, and a second passage configured to receive a fluid including the boil-off gas. The heat exchanger is configured to heat the fluid including the boil-off gas and cool the at least a portion of the exhaust stream. The fluid including the boil-off gas is heated by the heat exchanger upstream of the oxidation module.

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1. A system, comprising: a mixing module configured to receive and mix a boil-off gas stream comprising a boil-off gas from a cryotank disposed in an upstream direction from the mixing module and art oxygen stream to form a mixed stream;an oxidation module disposed in a downstream direction of the m

1. A system, comprising: a mixing module configured to receive and mix a boil-off gas stream comprising a boil-off gas from a cryotank disposed in an upstream direction from the mixing module and art oxygen stream to form a mixed stream;an oxidation module disposed in a downstream direction of the mixing module and configured to receive the mixed stream, the oxidation module comprising a catalytic converter configured to oxidize the boil-off gas in the mixed stream to produce an exhaust stream that is output in the downstream direction; anda heat exchanger comprising a first passage and a second passage and configured to exchange heat between streams passing through the first and second passages, the first passage configured to receive at least a portion of the exhaust stream, the second passage configured to receive a fluid including the boil-off gas, the second passage comprising an inlet and an outlet, the inlet and the outlet of the second passage disposed upstream of the oxidation module, whereby the heat exchanger is configured to heat the fluid including the boil-off gas and cool the at least a portion of the exhaust stream, whereby the fluid including, the boil-off gas is heated by the heat exchanger upstream of the oxidation module, wherein the inlet of the second passage of the heat exchanger is positioned downstream of the mixing module, the inlet configured to accept the mixed stream exiting the mixing module, whereby the mixed stream is heated after leaving the mixing module and before entering the oxidation module, further comprising a second heat exchanger comprising a first passage configured to accept a portion of the exhaust stream and a second passage configured to accept the boil-off as stream, the second passage of the second heat exchanger including an inlet interposed between the cryotank and the mixing module, whereby the boil-off gas is heated by the second heat exchanger before entering the mixing module. 2. The system of claim 1, wherein the inlet of the second passage of the heat exchanger is positioned upstream of the mixing module, the inlet configured to accept the boil-off has stream, whereby the boil-off gas is heated before entering the mixing module. 3. The system of claim 1, wherein the mixing module comprises an ejector configured to receive the boil-off gas stream at a pressure greater than atmospheric pressure, whereby the oxygen stream is entrained by the ejector from the atmosphere. 4. The system of claim 1, further comprising a thermoelectric power generation module disposed downstream of the catalytic converter, the thermoelectric power generation module configured to produce electrical energy using heat from the exhaust stream. 5. The system of claim 4, further comprising an ignition module configured to receive at least a portion of the electrical energy from the thermoelectric power generation module and to use the received electrical energy to beat the catalytic converter. 6. The system of claim 1, further comprising an ignition module configured to heat the catalytic converter. 7. The system of claim 1, further comprising a downstream mixing module disposed downstream of the oxidation module and configured to mix the exhaust stream with a cooling stream. 8. The system of claim 1, further comprising a blower configured to provide the oxygen stream to the mixing module. 9. The system of claim 8, further comprising an energy generation module disposed downstream of the oxidation module and configured to use the exhaust stream to provide energy for operating the blower. 10. The system of claim 8, further comprising a downstream mixing module disposed downstream of the oxidation module and configured to mix the exhaust stream with a cooling stream, wherein the blower is configured to provide the cooling stream to the downstream mixing module. 11. A system comprising: a cryotank configured to contain a cryogenic fluid;a control valve operably connected to the cryotank, the control valve configured to release a boil-off gas stream from the cryotank, the boil-off gas stream comprising a boil-off gas;a mixing module disposed downstream of the cryotank and configured to receive and mix the boil-off gas stream and an oxygen stream to form a mixed stream;a heat exchanger comprising a first passage and a second passage and configured to exchange heat between streams passing through the first and second passages the first passage configured to receive at least a portion of the exhaust stream, the second passage configured to receive a fluid including the boil-off gas, the second passage comprising an inlet and an outlet, the inlet and the outlet of the second passage disposed upstream of the oxidation module, whereby the heat exchanger is configured to heat the fluid including the boil-off gas and cool the at least a portion of the exhaust stream, whereby the fluid including the boil-off gas is heated by the heat exchanger upstream of the oxidation module, wherein the inlet of the second passage of the heat exchanger is positioned downstream of the mixing module, the inlet configured to accept the mixed stream exiting the mixing module, whereby the mixed stream is heated after leaving the mixing module and before entering the oxidation module, further comprising a second heat exchanger comprising a first passage configured to accept a portion of the exhaust stream and a second passage configured to accept the boil-off gas stream, the second passage of the second heat exchanger including an inlet interposed between the cryotank and the mixing module, whereby the boil-off gas is heated by the second heat exchanger before entering the mixing module;an oxidation module disposed downstream of the mixing module and configured to receive the mixed stream, the oxidation module comprising a catalytic converter configured to oxidize the boil-off gas in the mixed stream to produce an exhaust stream that is output downstream from the oxidation module; andan energy generation module disposed downstream of the oxidation module and configured to use the exhaust stream to provide energy for operating at least a portion of the system. 12. The system of claim 11, further comprising a blower configured to provide the oxygen stream to the mixing module, wherein the energy generation module comprises a turbine configured to provide mechanical energy for operating the blower. 13. The system of claim 11, wherein the energy generation module comprises a thermoelectric power generation module configured to produce electrical energy using heat from the exhaust stream. 14. The system of claim 13, further comprising an ignition module configured to receive at least a portion of the electrical energy from the thermoelectric power generation module and to use the received electrical energy to heat the catalytic converter. 15. The system of claim 13, further comprising a blower configured to provide the oxygen stream to the mixing module, wherein the blower is configured to receive at least a portion of the electrical energy from the thermoelectric power generation module. 16. The system of claim 11, further comprising a downstream mixing module disposed downstream of the oxidation module and configured to mix the exhaust stream with a cooling stream. 17. A tangible and non-transitory computer readable medium comprising one or more computer software modules configured to direct at least one processor to: direct a boil-off gas stream comprising boil-off gas from a cryotank to a mixing module;direct an oxygen stream to the mixing module;mix the boil-off gas stream and the oxygen stream in the mixing module to produce a mixed stream;direct the mixed stream through an oxidation module comprising a catalytic converter, whereby an exhaust stream is produced by the catalytic converter; anddirect the exhaust stream through at least one of: a heat exchanger comprising a first passage and a second passage and configured to exchange heat between streams passing through the first and second passages, the first passage configured to receive the exhaust stream, the second passage configured to receive a fluid including the boil-off gas, the second passage comprising an inlet and an outlet, whereby the inlet and the outlet of the second passage are disposed upstream of the oxidation module, whereby the heat exchanger is configured to heat the fluid including, the boil-off gas and cool the exhaust stream, whereby the fluid including the boil-off gas is heated by the heat exchanger upstream of the oxidation module; oran energy generation module disposed downstream of the oxidation module and configured to use the exhaust stream to provide energy for operating at least a portion of a system configured to process the boil-off gas stream), wherein the one or more software modules are further configured to direct the at least one processor to:direct at least a portion of the exhaust stream through a first heat exchanger having an inlet configured to accept the boil-off gas stream and disposed upstream of the mixing module, whereby the boil-off gas is heated before entering the mixing module; anddirect at least a portion of the exhaust stream through a second heat exchanger having an inlet configured to accept the mixed stream and disposed downstream of the mixing module, whereby the mixed stream is heated after leaving the mixing module and before entering the oxidation module. 18. The tangible and non-transitory computer readable medium of claim 17, wherein the one or more software modules are further configured to direct the at least one processor to determine if the temperature of the exhaust stream downstream of the at least one of the heat exchanger and the energy generation module exceeds a threshold exhaust temperature, and if the temperature of the exhaust stream exceeds a threshold temperature, to direct the exhaust stream through a downstream mixing module disposed downstream of the oxidation module and configured to mix the exhaust stream with a cooling stream. 19. The tangible and non-transitory computer readable medium of claim 17, wherein the one or more software modules are further configured to direct the at least one processor to direct energy generated by an energy generation module disposed downstream of the oxidation module to a blower configured to provide the oxygen stream to the mixing module.