Steam Calculators: Boiler Calculator - Energy.gov
When a large amount of feedwater enters the boiler, the steam space above the water level becomes foggy. This fog and the resultant water-contaminated, low-quality steam continue until the water in the boiler becomes reasonably isothermal. The second problem is the suppression of the rate of steam …
Apr 15, 2008 · Because it is the least expensive option, single-element control is practically universal among boilers with steam-generation rates below about 11,000 lb per hour. In practice, however, even moderate load swings can lead to excessive fuel and maintenance costs.
Consider, for example, a 100 BHP boiler operating with make-up water at 60°F and producing steam at 125 psig. In this case, the "from and at 212°F" steaming rate is 3,450 lbs/hr, but the net steaming rate is only 2874 lbs/hr—17% less than the "from and at 212°F" steaming rate.
Steaming Rate Definitions - Clayton Industries Boiler and
Mar 17, 2015 · Using the calculated feedwater mass flow and blowdown rate: Blowdown Mass Flow = Feedwater Mass Flow * Blowdown Rate; Using the Steam Property Calculator, properties are determined using Steam Pressure and Quality = 0 (Saturated Liquid). The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow: Blowdown Energy Flow = Specific Enthalpy * Mass Flow; Step 4: Determine Boiler Energy. Boiler Energy = Steam Energy Flow + Blowdown Energy Flow - Feedwater Energy Flow…
Mar 17, 2015 · Feedwater Mass Flow = Steam Mass Flow / [ 1 - Blowdown Rate] [ Feedwater Mass Flow = 72.5 klb/hr = 67.9 klb/hr / ( 1 - 0.064 ) ] Using the Steam Property Calculator, properties are determined using Deaerator Pressure and Quality = 0 (Saturated Liquid).
Steam System Velocity (m/s) (ft/s) Saturated Steam - high pressure: 25 - 40: 82 - 131: Saturated Steam - medium and low pressure: 30-40: 99 - 131: Saturated Steam at peak load < 50 < 164: Steam and Water mix < 25 < 82: Superheated Steam: 35 - 100: 100 - 300