A Texas lignite has the following ultimate analysis: carbon 39.25%, hydrogren 6.93%, oxygen 41.11%, nitrogen 7.2%, sulphur 7.9%, and ash 11.20%. a. Compute the air required for the perfect combustion b. Compute the pounds of flue gas formed per pound of flue unde conditions (a) c. Compute the volume of each gaseous constituent at 800F

Using the vapor pressure curve, estimate the normal boiling point of substance B. Report your answer in 1 decimal place with appropriate unit.

21. A large containment is filled with steam, air, and nitrogen. The containment also has a pool of water, which is sprayed in the containment atmosphere. Heat is added to the con- tainment at a specified rate. Use the given data to find a) the initial containment pressure and b) the time it takes for the containment pressure to reach the pressure limit of 145 psia (1 MPa). Total mass of water (water in the pool and steam) m,, = 3.42E6 lbm (1.55E6 kg) Water-steam quality x = 0.03 Air mass m, = 0.132E6 lbm (6E4 kg) Nitrogen mass m, = 2200 lbm (998 kg) Containment initial temperature T; = 688 R (109 C) Initial relative humidity ø = 100% Rate of heat addition to containment atmosphere Q = 1.02E8 Btu/h (30 MW) [Ans.: 7.66 h].

You work in a chemical plant which recovers gold from gold-plated electrical connectors using heated (Tacid = 55oC) nitric acid.  Once the acid is “used up” it gets piped through the plant to a separate facility for disposal.  During that time, it passes through a cooling chamber to strip the waste heat off the acid for recovery.  The acid passes through the chamber in 6m long, 400mm OD, 360mm ID aluminum tubes. The chamber passes room-temperature air over the tubes at 8 m/s.  Approximately 0.45 cubic meters of acid is processed per hour. a) What is the Reynold’s number of the nitric acid passing through the tube?  Is it turbulent or laminar? b) What is the heat transfer coefficient of the nitric acid to the inside of the aluminum tube? c) What is the heat transfer coefficient of the air over the tube? d) What is the overall heat rate from the nitric acid to the air? e) Based on your answers here, in a gas-liquid heat exchanger, which side of the exchanger are the fins usually on?…