OCR Text |
Show The cyclonic incinerator with the base is shown in Figure 2. Heat Recovery Boiler The heat available in the incinerator exhaust gases was partially recovered in a two-pass Scotch Marine boiler with a horizontal firetube (see Figure 3). The boiler is equipped with front and rear hoppers to remove ash particles. Soot blowers, installed for final system operation at the entrance to the convective pass of the boiler, are of co-current flow, compressed air design. In addition, a 12-foot-long, retractable rotary soot blower provided Morison tube and return box cleaning. Boiler design parameters are as follows: Boiler Model York-Shipley HRH-265 Horsepower 40 Steam Output, lb/h 1390 Heating Surface, ft 2 265 Design Pressure, psig 200 Operating Pressure, psig 160 Air Heater and Hot Air Ducting Further heat recovery was provided by an air heater which is of basic shell-and-tube heat exchanger design. The air heater 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 out of the air heater. Combustion air flows counter to the flue gases which are passed through the tubes. Expansion joints are integral to the design of the air heater. The air heater design parameters are as follows: Air Flow, SCF/min Blower Pressure, oz Heating Surface, ft 2 Primary Air/Gas Mixture Temperature, of Secondary Air Temperature, ~ 450 28 330 595 650 Preheated combustion air was then conveyed to the incinerator and separated into two air streams. Primary air stream passes through a butterfly 5 |