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A pyrolytic hydrogen generator comprising a pressure vessel containing a plurality of cardboard receptacles for the thermally decomposable hydrogen generating material and an associated ignition system. Also, a modular pellet tray assembly for use in the generator comprises a plurality of trays havi

A pyrolytic hydrogen generator comprising a pressure vessel containing a plurality of cardboard receptacles for the thermally decomposable hydrogen generating material and an associated ignition system. Also, a modular pellet tray assembly for use in the generator comprises a plurality of trays having pellet holders and associated igniters and held in a stack by support rods that also provide electrical connectivity to the trays. Also, a pellet tray assembly comprises a plurality of pellet holders, wherein some of more outwardly disposed pellet holders contain only outwardly facing vents and are fired first. Also, the generator has an array of hydrogen generating elements arranged side by side and separated from one another into cells by partitioning provided with directional venting that only permits laterally exiting gases to vent outwardly. Alternatively, the elements can be separated into cells by a baffle system comprising gas confining and gas venting elements, which may be heat conductive.

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1. A pyrolytic hydrogen generator comprising an array of pyrolytic hydrogen generating elements arranged side-by-side and separated from one another into cells by partitioning provided with directional venting designed to permit gases to exit laterally in outward directions only with respect to the

1. A pyrolytic hydrogen generator comprising an array of pyrolytic hydrogen generating elements arranged side-by-side and separated from one another into cells by partitioning provided with directional venting designed to permit gases to exit laterally in outward directions only with respect to the centre of the array. 2. A pyrolytic hydrogen generator as claimed in claim 1, wherein initiation of pyrolysis of the hydrogen generating elements is controlled by a control system in a sequence that minimises or avoids hydrogen generating elements venting outwardly towards unfired adjacent hydrogen generating elements. 3. A pyrolytic hydrogen generator as claimed in claim 1, wherein the directional venting for inwardly disposed hydrogen generating elements in the array directs exiting gases and any exiting waste products towards gaps between neighbouring outwardly disposed hydrogen generating elements. 4. A pyrolytic hydrogen generator as claimed in claim 1, wherein the hydrogen generating elements comprise pellet(s) of hydrogen generating material and the partitioning comprises individual housings surrounding the pellets(s), which housings have only outwardly facing vents. 5. A pyrolytic hydrogen generator as claimed in claim 4, wherein the housings are additionally surrounded by a system of baffles extending between them and partitioning them into a further set of individual cells. 6. A pyrolytic hydrogen generator as claimed in claim 5, wherein the baffles demarcate cells containing designated empty spaces disposed outwardly and adjacent to the housings. 7. A pyrolytic hydrogen generator as claimed in claim 6, wherein the outwardly facing vents in the housings direct exiting gases and any exiting waste products towards the designated empty spaces inside the baffles. 8. OA pyrolytic hydrogen generator as claimed in claim 5, wherein the baffles are substantially porous so that most of their surface area allows gases to vent freely therethrough. 9. A pyrolytic hydrogen generator as claimed in claim 7, wherein the baffles are formed as a one-piece grid arrangement. 10. A pyrolytic hydrogen generator as claimed in claim 1, wherein the array of hydrogen generating elements is partitioned up by a system of baffles into the cells, there being a central region of one or more cells, and one or more successive outwardly disposed annular regions of cells. 11. A pyrolytic hydrogen generator as claimed in claim 10, wherein the system of baffles comprises two or more concentric rings of circumferentially extending gas venting baffle elements intersected by radially extending, gas confining baffle elements, so as to form the cells. 12. A pyrolytic hydrogen generator as claimed in claim 9, wherein the one-piece grid arrangement is formed of a collapsible honeycomb structure. 13. A method of operating a pyrolytic hydrogen generator according to claim 1, wherein pyrolysis of the outermost hydrogen generating elements is initiated prior to the more inwardly disposed hydrogen generating elements. 14. Portable equipment comprising a pyrolytic hydrogen generator according to claim 1.