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Show • 180° to 190°F. The conveying pipe is stainless steel and connections are made by quick-clamp fittings. A pressure switch is provided before a dual filter arrangement to detect low flow in the conveying line. The pump is designed only to shut off on an overload condition, but when flow to the incinerator is not desired, as in the case of an exceeded limit, the flow can be diverted away from the incinerator with a diverter valve. Boiler Gases from the incinerator are ducted directly to the boiler which is a two-pass heat recovery scotch marine boiler with horizontal firing tube design. The boiler is equipped with front and rear particulate drops to remove any ash particles deposited in the boiler. Ash removal is manual through two knife-gate valves. Soot blowers, provided in the front of the boiler, are of the reverseflow, compressed air design. Boiler data for both designs are presented in the following table: Boiler Model Horsepower Steam Output, Ib/h Heating Surface, ft 2 Design Pressure, psig Operating Pressure, psig Recuperator Demonstration Unit HRH-265 40 1390 265 200 160 Industrial Unit HRH-1400 270 9330 1400 200 160 Combustion air for the demonstration unit is provided by a Chicago Blower Turbo Pressure blower for which the inlet is ducted from the ceiling of the plant to provide an air inlet temperature of 100° to 110°F. Prior to entering the recuperator, all of the main air is passed through an orifice plate for metering. The recuperator is designed to utilize exhaust gases from the boiler and is of basic shell and tube heat exchanger design. The recuperator consists of two vertical columns connected by turning boxes for both exhaust gases and clean combustion air. Ash drops in each column are provided to remove ash which is dropped out in the recuperator. Combustion air flows counter to the exhaust gas which is passed through the tubes. Expansion joints are integral to the design of the heat exchanger. Combustion air is then conveyed to the incinerator via an 8-inch duct, but separated into two air streams before reaching the incinerator. One air stream passes through a butterfly valve and then onto the natural gas mixer where the air is mixed with natural gas before passing through a stainless steel cell type flame arrestor and then into a distribution collar. From the distribution collar, the gasair mixture is piped directly to the top row of nozzles of the incinerator. Metering valves are provided in each leg before the mixture enters the incinerator. 45 |
