Summary Of Nitrogen Generator

One aspect of the present invention includes the realization that cryogenic nitrogen

generators can be made sufficiently portable to provide practicable sources of higher purity nitrogen gas for drilling operations.

Another aspect of the present invention includes the realization that standard sized containers can be used to provide a protective housing during transportation and operation of the cryogenic nitrogen generator. By using standard size containers to form a housing for a cryogenic nitrogen generator, such as a cryogenic distillation and associated heat exchanger unit, the device can be shipped to a drilling site and efficiently and quickly assembled into an operative state. For example, a cryogenic nitrogen generator can include an air preparation unit and a cryogenic distillation and associated heat exchanger unit. The air preparation unit typically will include an absorption device, such as a Pressure Swing Absorption (PSA) or a Temperature Swing Absorption (TSA) unit. Optionally, the air preparation unit can also include one or a plurality of air compressor units. The air preparation unit can be configured to fit within a standard ISO container resting horizontally. However, a cryogenic distillation unit is quite tall. For example, typical cryogenic distillation units, also known as cold boxes, can be as tall as 30 feet or more to produce Nitrogen gas of better than 99% purity. Thus, the distillation unit can be separately housed in a standard ISO container. With these units separately housed as such, they can be transported to and through virtually any country in the world using standard sized trucks or via ocean-going ships. Additionally, once delivered to a drilling site, the separate components can be connected and operated while they remain in the separate containers.

A further advantage in using ISO containers is that such containers include standard anchoring points which can be connected together. For example, anchoring points of each container can be connected together so as to provide further stability for plumbing connections between the containers and also to provide further stability to the container housing the distillation unit. For example, because the distillation unit is tall, connection to another container, and in particular another ISO container, provides further stability to the total system.

Typical cryogenic air separation plants are designed to remove normal levels of carbon dioxide, hydrocarbons, sulfur containing compounds, and other acid gases in ambient feed air. However, ambient air contaminate levels at oil or gas exploration drilling and recovery sites can be higher than normal levels, making it necessary to use additional precautions to ensure safe air separation plant operation. Accordingly, in one embodiment, the air preparation unit also includes a catalytic converter to remove hydrocarbons from an ambient air stream, preferably before the air stream enters the absorption device.

by: ericfu

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