Suction gas plants . f the hotgases, not only because it returns heat which would otherwise bewasted, to the producer, but because the cooling down of thegas enables a greater weight of it to be drawn into the engine onthe suction stroke, with the result that more power can beobtained from a given cylinder volume. Yet another type of vaporiser, mostly used in Continentaldesigns, is the tube vaporiser, placed outside the producer. Inthis design the gas, on its way from producer to scrubber, passesthrough an arrangement somewhat resembling a locomotiveboiler. A cylindrical casing is divided into
Suction gas plants . f the hotgases, not only because it returns heat which would otherwise bewasted, to the producer, but because the cooling down of thegas enables a greater weight of it to be drawn into the engine onthe suction stroke, with the result that more power can beobtained from a given cylinder volume. Yet another type of vaporiser, mostly used in Continentaldesigns, is the tube vaporiser, placed outside the producer. Inthis design the gas, on its way from producer to scrubber, passesthrough an arrangement somewhat resembling a locomotiveboiler. A cylindrical casing is divided into three compartmentsby two tube plates, the two outer compartments being connectedby a tube or bank of tubes. In some cases the gas passes insidethe tubes, whilst the water contained in the middle compartmentsurrounds them, and in others the water is inside and the gaspasses outside the tubes, as in an ordinary water-tube are objections to both these arrangements. If fire tubes DETAILS OF CONSTRUCTION. 27. 28 SUCTION GAS PLANTS. are used, the lime salts present in the water are deposited onthe outside of the tubes, where cleaning operations are impossibleand the flow of heat from gas to water is retarded. If, on theother hand, water tubes are used, there is the drawback that theyreadily become clogged up by the deposition of lime and othermatter present in the water, and their exterior surfaces arereadily covered with tar and soot from the gases. The use ofbrass or copper tubes should be avoided, as they quickly becomecorroded by the ammonia and sulphuretted hydrogen containedin the gas. A coiled pipe is used by some makers, somewhat like a flashboiler. This is open to the same objections as the water-tubes ofthe tubular type, with the addition that, being coiled, the inside ofthe tubes is not accessible for cleaning purposes (fig. 30). Other makers allow the water to trickle over a hot type is immune from the above disadvantages, and has thefurther mer
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