Calculation of the natural gas volume required for gas steam boilers

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Calculation of the natural gas volume required for a gas steam boiler: A gas steam boiler needs 5 tons of steam at 160 degrees Celsius per hour under normal pressure. Calculate the amount of natural gas required per hour. 1. Calculation of required heat: The average specific heat capacity of water, Cpm = 4.1868 KJ/(Kg*K) ； The enthalpy of water at 100°C is 2684 KJ/Kg, and its latent heat of vaporization is 2257.2 KJ/Kg ； The enthalpy value of water at 160°C is 2800 KJ/Kg ； The set pressure value is 100000 Pa. 1. The heat q1 required for water to go from 0°C to 100°C is equal to Cpm*△t = 418.68 KJ/Kg ； 2. The latent heat of transformation from 100℃ wet steam to dry steam, q2 = 2257.2 KJ/Kg ； 3. The heating value of superheated steam q3 = h2 – h1 = 116 KJ/Kg. The heat Q = m*(q1+q2+q3) = 5000*2791.88 = 13959400 KJ. 2. Calculation of natural gas volume: Assume that x Nm3 of natural gas is required. Since the lower calorific value of 1 Nm3 is 35906 Kj, then x * 35906 * 0.9 = 13959400. Therefore, X = 13959400/35906/0.9 = 412 Nm3/h. Thus, the amount of natural gas needed to produce 5 tons of steam at 160 degrees per hour is 412 Nm3/h. This post was last edited by yps_78 on 2009-3-11 at 17:13