| 摘要 |
There is disclosed a system for measuring and controlling the concentration of hydrogen in hydrogen-consuming hydrogen recycle processes used in oil refineries and petrochemical plants. The system is intended to reduce utilities and hydrogen usage by means of adjusting vent gas flow and the quantity of hydrogen and hydrocarbon vapor circulating to obtain the operating parameters which yield minimum cost. Specifically there can be a savings of compressor power, fuel required for heating, and hydrogen. The system is dependent on the recognition that a decrease in cooling medium temperature results in an increase in hydrogen flow, which can be decreased to the minimum permissible without endangering catalyst activity and stability and product yield if hydrogen concentration is monitored, that partial pressure is the key parameter, and that it is advantageous to optimize.
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