Material selection and conditioning to avoid brittleness caused by nitriding
AssigneeABB Combustion Engineering
InventorsFrank Gabrielli, Thomas B. Gibbons, Stephen L. Goodstine, James K. O'Neill
Life of this patent
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Abstract
A system for changing the temperature of a working fluid, including amonia, includes a working fluid source and a steel tube. The working fluid source is configured to direct a flow of the working fluid. The working fluid from the source is at a temperature. The steel tube has a treated inner surface layer defining a flow passage. The surface may comprise a mill finish surface, an oxidizing surface and/or a chromized surface. The tube is configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path to change the temperature of the received working fluid.
Claims20
A system for transferring heat to a working fluid, including ammonia, comprising:
- a working fluid source configured to direct a flow of a working fluid which includes ammonia and has a temperature;
- and
- a plurality of steel tubes, each tube having a flow passage defined by a treated inner surface, configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path exposed to heat to increase the temperature of the received working fluid.
A system for transferring heat to a working fluid, including ammonia, comprising:
- a working fluid source configured to direct a flow of a working fluid which includes ammonia and has a temperature;
- and
- a plurality of steel tubes, each tube having a flow passage defined by an oxidized inner surface of the tube, configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path exposed to heat to increase the temperature of the received working fluid.
A system for transferring heat to a working fluid, including ammonia, comprising:
- a working fluid source configured to direct a flow of a working fluid which includes ammonia and has a pressure substantially greater than ambient pressure;
- and
- a mild steel flow tube, having an inner surface defining a flow passage, configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path.
A system for transferring heat to a working fluid, including ammonia, comprising:
- a working fluid source configured to direct a flow of a working fluid which includes ammonia and has a temperature;
- and
- a plurality of steel tubes, each tube having a flow passage defined by a chromized inner surface of the tube, configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path exposed to heat to increase the temperature of the received working fluid.
A system for changing the temperature of a working fluid, including ammonia, comprising:
- a working fluid source configured to direct a flow of a working fluid, including ammonia, at a temperature;
- and
- a steel tube, having a treated inner surface defining a flow passage, configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path to change the temperature of the received working fluid.
A Kalina cycle power generation system, comprising:
- a plurality of steel tubes configured to heat a binary working fluid including ammonia, each of the plurality of tubes having a treated surface for contacting the binary working fluid and for defining a flow passage for directing a flow of the binary working fluid;
- and
- a turbine for receiving the heated binary working fluid from the plurality of tubes and expanding the received heated binary working fluid to generate power.
Dependencies are inferred from the claim text.