Browse Prior Art Database

Active Control of Cathode Air Using Oxygen Concentration Sensor

IP.com Disclosure Number: IPCOM000028645D
Publication Date: 2004-May-25
Document File: 2 page(s) / 559K

Publishing Venue

The IP.com Prior Art Database

Abstract

Active Control of Cathode Air Using Oxygen Concentration Sensor, Active control of cathode process air using a hot wire anemometer/thermal dispersion mass flow sensor.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 59% of the total text.

Active control of cathode process air using an oxygen concentration sensor

Active control of cathode process air using a hot wire anemometer/thermal dispersion mass flow sensor.


Fuel cell power plants require a specific quantity of reactant/process air to ensure good performance. This process air is provided to the cell stack assembly (“CSA”) cathode by an air blower. The air supply can be controlled by adjusting the process air blower speed using a fixed schedule, based upon CSA current. This control scheme will not compensate for variations in environmental conditions (e.g. changes in ambient pressure due to elevation and weather conditions, changes in ambient temperature). In addition the control scheme will not compensate for variations in component operating characteristics (e.g., changes due to wear of equipment, plugging of filters). Not compensating for these conditions can cause an insufficient supply of air reducing performance and efficiency of the power plant.  The schedule that sets process air blower speed respective to current has to be re-tuned whenever a modification is made to the air flow train, before the power plant back into operation, This can incur additional cost associated with testing of the power plant and with providing the manpower to analyze the data and reset the schedule.
A new approach intended to alleviate the foregoing problems involves:


(1) Establish a conservative nominal blower speed - current schedule for the particular power plan...