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Fluidized beds (see Figure P26.7) are used in the chemical industry as steam generators n Such equipment can burn almost any fuel, including low-quality coals such as lignite. Flue Fuel Injection pipes 1550F Plenum Air distribution grid Fluid bed steam generator Figure E26.7 Coal burns rapidly in a fluidized bed, even at 1500F. Based on bed volume, the heat release is 300,000-400,000 Btu/hr)(ft). Counting the open furnace space above the bed the rate is 100.000-200,000 Btu/hr)(ft). Suppose that 200,000 Btu/(hr)(ft)) are generated in a 40 ft) steam generator, that the water enters the two sets of coils at 70F, and that in the upper set of coils the water flow rate is 3,000 lb/hr leaving as steam at 900F and 380 psia. If the steam leaving the lower coils is at 1200F and 400 psia, what is the flow rate of the water into the lower set of coils