Hydrogen leakage

As particle size decreases, hydrogen leakage decreases and hot spot temperature in the bed is higher. Thus the smaller particle size has greater activity (see Table VI). A kinetic system which defines the reaction in terms of CO and C02 methanation and CO shift conversion was used to determine the activity (see last column of Table VI). 

In the various laboratory studies when the outlet gas composition was not at equilibrium, it was observed that the steam-to-gas ratio (S/G) significantly affected the hydrogen leakage while the carbon monoxide still remained low. On the assumption that various reactions will proceed at different rates, a study was made to determine the effect of S/G on the reaction rate. The conditions for this test are presented in Table VII the findings are tabulated in Table VIII. 

Swain, M.R., Filoso, P., Grilliot, E.S., and Swain, M.N., Hydrogen leakage into simple geometric enclosures, Int.. Hydrogen Energ, 28, 229, 2003. 

The following is a brief description of the use of the Hydrogen Risk Assessment Method (HRAM) to analyze the risk associated with hydrogen leakage in a residential garage. The four-step method is as follows ... 

Open Flames. Open flames are an obvious ignition source (others are subtle, obscure). One must control smoking, welding, burning and other flame sources in areas of potential hydrogen leakage. 

The goals and objectives of this work effort were developed anticipating the needs of various projects and authors of codes and standards. This work addresses potential safety concerns due to hydrogen leakage in three areas of hydrogen utilization. These safety concerns affect the widespread use of hydrogen in the private sector. The three areas of hydrogen utilization are as follows ... 

A stream of helium filled soap bubbles can be utilized to visualize hydrogen leakage in an enclosure. 

It is thus probable that the hydrogen concentration is no longer explosive at electrical equipment level. Hydrogen leakage in the network due to equipment failure can however stiU be envisaged. 

Illustration 3.4 Sievert s Law Hydrogen Leakage through a Reactor Wall... 

In this section, the effectiveness of the hydrogenous moderator layer in reducing the coolant void reactivity is explained. Its influence on breeding capability is also studied. The neutron spectra with and without the layer are analyzed and compared. Two different coolants, steam (water) and liquid sodium, are considered. The hydrogen leakage from the layer during normal operation and accidental conditions are also studied. 

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