Containment Hydrogen Control System

The containment hydrogen control system consists of three elements ... 

Although active safety is provided by the control systems mentioned above, passive safety is an additional important feature of a distributed plant. Due to the low inventory, even a total release of the reaction volume or an explosion would create no significant impact on the environment [139]. To prevent such scenarios, a total containment of the plant is envisaged it needs to be sealed for life . Hydrogen cyanide synthesis and chlorine point-of-sale manufacture are two examples for safety-sensitive distributed syntheses. 

Apparatus. The hydrogen-absorption system, a modified Sievert s apparatus, consisted of three self-contained units. The first unit provided a source of, and storage facilities for, pure hydrogen, which was obtained by the thermal decomposition of uranium hydride. The second unit provided precise metering of hydrogen at a known temperature, for delivery to the reaction system. The third unit was a constant-volume section in which the reaction of hydrogen with the zirconium-uranium alloy occurred at a controlled temperature ( 3° C.). The equilibrium pressures of hydrogen were measured in this section also. 

The bulk of the energy demands of the cell are met within the mitochondria by the production of ATP during the oxidation of substrates by way of the hydrogen transport line (see Chapter 7). When the enzymes and carriers of this system are studied in isolation, they are found to be capable of extremely rapid reactions, yet if the intact mitochondrion is presented with substrates such as pyruvic acid it is found that the rate of pyruvic acid oxidation reaches a maximum which is considerably below the maximum velocities shown by the individual carriers. As increasing the amount of pyruvic acid does not alter this oxidation rate, it is clear that the mitochondrion must contain its own built-in control system to limit the rate at which it burns fuel. We can isolate some of the elements in this control system if we draw a schematic flowsheet of the operations involved in oxidation (Figure 25). 

A CATOX unit facilitates the oxidation of carbon monoxide, hydrogen, and volatile organic compounds contained in an air stream such as that emerging from the particle filter in the pollution control system of the CDC. Generally, the air stream is passed through a bed of a catalytic solid that acts very much like that in an automotive catalytic converter. 

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