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Engineering, 27.11.2019 22:31 wolfking800

2. consider a proposal to fuel the gas turbine at the kettle falls generating station discussed in problem 1 with syngas generated by gasifying corn stover. the corn stover and the resulting gasification products are carbon neutral. the process has a gasification efficiency of 60% based on the lower heating value of the corn stover on a mass basis. the gasification process converts 1.00 kg of dry, ash-free corn stover to 0.830 kg syngas and 0.110 kg dry biochar (i. e., these are the yield ratios for syngas and biochar). the resultant biochar is composed of 92.0% carbon and 8.0% ash on a dry basis. the as-received corn stover is purchased for $60.00 per ton (as-received) and the natural gas is purchased for $4.00/mbtu. the dry, ash-free higher heating value of the corn stover is 18.1 mj/kg. the hydrogen content of the corn stover is 4% on an as-received basis. the moisture and ash content of the corn stover are 20.0% and 10.0%, respectively on an as-received basis. assume the heat rate for the syngas-fired gas turbine is 8000 btu/kwh. a. what is the lhv of the syngas produced (mj/kgayngas)? b. how much syngas is needed annually to fuel the gas turbine (mgsyngas/y)? c. how much corn stover (as-received basis) must be gasified annually to provide syngas for the gas turbine (tas-reco/y)? d. how much biochar (dry basis) is produced annually from the gasification of the corn stover (mgoiochar(ory/y)? e. what mass of co2 is sequestered by the biochar per mwh of electricity produced by the gas turbine (mgoo/mwhturbine)? assume that 90% of the biochar remains in the soil on a long term basis. f. how much co2 is avoided per mwh of electricity produced by the use of syngas with biochar carbon capture (mgoo2/mwhturbine)? g. what is the increased fuel cost of using corn stover instead of natural gas ($/y)? h. if carbon emissions are taxed at $70.00/mg0o2, what are the annual carbon cost savings of using corn stover with biochar for carbon capture ($/y)?

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