Estimation of air compressor power and estimation of turbine steam consumption
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I am currently carrying out preliminary work on some coal-to-methanol projects, and I would appreciate some guidance on the following question: 1. For an air separation unit with a capacity of 40,000 m3/h (used to supply oxygen to a 6.5 MPa water-coal slurry gasifier), what is the approximate power requirement for the air compressor and the booster pump? How to calculate it? 2. If a fully condensing type turbine is used in conjunction with an air compressor + booster, how many tons of steam are required approximately? (Steam inlet pressure of the turbine is approximately 9.8 MPa, at 540 degrees) How to calculate it? 3. For a turbine used in conjunction with an air compressor and a booster, if it is of the back-pressure type, with a back-pressure steam pressure of 5.4 MPa and the same inlet steam pressure, how many tons of steam are required? How to calculate it? This post was last edited by Chemical Hacker on 2008-1-1 21:45.]
Why isn’t anyone responding? Pick yourself back up first
A 4000 m3/h air separation unit paired with a 6.5 MPa water-coal slurry gasifier seems to have somewhat limited capacity; it’s not clear what device it is intended for. It is likely that a 40,000 Nm3/h air separation unit would be needed. The estimated power requirements for a 4000 m3/h air separation unit are as follows: the power consumption of the air compressors and boosters is assumed to be 0.6 Kw/Nm3O2, which amounts to 2400 Kw. With a full-condensation type, the steam consumption is 4.5 kg/kWh, resulting in 10,800 kg/h of steam usage; whereas with a back-pressure type, the steam consumption is 25 kg/kWh, giving 60,000 kg/h of steam usage. Different manufacturers provide varying values for the power consumption of air compressors and boosters. The figures given here are estimates, with variations not exceeding 10%. If a higher actual capacity is required, simply multiply these values by the appropriate factor.
Sorry, the air separation capacity should be 40,000 Nm3/h. Thank you very much for the reply from the 3rd floor.