A thousand pounds per hour of vacuum residue is fed into a flexicoker which has a CCR of 15%. Find the circulation rate of coke between the reactor and the burner in order to keep the temperature of the reactor, heater and burner (gasifier) at 1000, 1300 and 1500 F, respectively. The low Btu gas (LBG) flow rate is 2000 lb/h. The specific heat of carbon 14 0.17 Btu/lb F and the specific heat (Cp) for the gases 14 0.24 Btu/lb F. The net coke production in this case is 2.0 wt%. Assume 70% of the coke is consumed in the burner.