Suction gas plants . -flow pipe. The ashes may be cleared out, say, every four may be done while the engine is at work, if done fuel chamber simply consists of the space between thefurnace and the hopper, and acts as a storage for fuel, instead ofusing a distilling bell, as is done in Qther plants. The tarryvapours given off from the raw fuel cannot pass directly to thegas outlet, however. They have to travel downwards throughthe incandescent fuel until they get below the vaporiser beforethey are able to do so, and by that time they are in great partsplit up into fixed g
Suction gas plants . -flow pipe. The ashes may be cleared out, say, every four may be done while the engine is at work, if done fuel chamber simply consists of the space between thefurnace and the hopper, and acts as a storage for fuel, instead ofusing a distilling bell, as is done in Qther plants. The tarryvapours given off from the raw fuel cannot pass directly to thegas outlet, however. They have to travel downwards throughthe incandescent fuel until they get below the vaporiser beforethey are able to do so, and by that time they are in great partsplit up into fixed gases. The fuel hopper is, again, of a difierenttype. This, the charging device, consists of a sliding door at thebottom of the hopper, which is moved by means of a handle from 94 SUCTION GAS PLANTS. the outside. This is preferable to the types already noted, butmust be nicely arranged to work freely, without permittingleakage of air into the furnace. If the fuel chamber has been Cleaning Door ? —--e Fuel Chamber-. ?Dratn Fig. 28.—Plant with Annular Chamber Type of Vaporiser, previously well filled, it is sometimes impossible to prevent coalfrom jamming between the top and bottom faces of the hopperand the end of the sliding door. Charging slides in general havethe advantage over valves, that a poking tool can be insertedright through the generator to the fire-bars, and that all parts APPLICATIONS AND USES OF THE SUCTION PLANT. 95 of the producer are then accessible. With a valve, poking holesmust be provided, as there is merely an annular space, relativelysmall in area, which permits access to only certain parts of thefurnace. The swinging valves also restrict the free use of theclinkering bar. A cover is fastened to the top of the hopper by means of studsand wing nuts. The valve and cover should never be open atthe same time, nor should the plug in the top of the cover beleft out, or a stoppage of the plant will take place. The vaporiser consists of an annular chamber on t
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