Suction gas plants . Fig. 12.—Circular Form of Vaporiser. load which causes a variation in the draught of air through theproducer. Were the steam supply to remain constant at light loads, therewould be a great variation in the quality of the gas and thetemperature of the producer. 30 SUCTION GAS PLANTS. As we have seen above, there are three ways of automaticallyregulating the water or steam supply. They are :— (a) By automatically varying the amount of water sucked in. (6) By varying the dry air supply and so reducing the pro-portion of water vapour introduced into the furnace. (c) By varying
Suction gas plants . Fig. 12.—Circular Form of Vaporiser. load which causes a variation in the draught of air through theproducer. Were the steam supply to remain constant at light loads, therewould be a great variation in the quality of the gas and thetemperature of the producer. 30 SUCTION GAS PLANTS. As we have seen above, there are three ways of automaticallyregulating the water or steam supply. They are :— (a) By automatically varying the amount of water sucked in. (6) By varying the dry air supply and so reducing the pro-portion of water vapour introduced into the furnace. (c) By varying the temperature of the air supply. Mechanical devices for doing all of these things have beentried. They are usually controlled by the suction stroke of theengine. But on the whole it is found to be satisfactory undernormal conditions to work without them. The times of lightload are usually of short duration, and can generally be antici-pated by an intelligent attendant. The design of the vaporiser varies accord
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