Experimental program for the development of peat gasification. Interim report No. 5: Process design and cost estimates for a 250 billion Btu/Day SNG from peat plant by he PEATGAS Process
This report presents a process design and cost estimate of a plant for the production of 250 billion Btu's of SNG per stream day from a Minnesota peat by the PEATGAS Process. The plant is self-sufficient, generating all steam and power (including that needed for oxygen production) from the peat. The total daily plant requirement of milled peat with a 50% water content is estimated at about 56,300 tons. Of this total, 78% is used in the reactor; the rest is used as boiler fuel. In the PEATGAS Process peat is gasified in a two-stage reactor at 500 psig. The process makes about 78% of the total methane directly within the reactor. The plant produces by-product hydrocarbon liquids: 136,000 gal/day of benzene and 280,560 gal/day of aromatic oils. These liquid by-products account for 18.2% of the total heating value of all products. The total daily fuel (SNG + liquids) output of the plant is 309 billion Btu. Other by-products from the plant include 546 tons/day of anhydrous ammonia and 52 long tons/day of sulfur. Overall plant thermal efficiency is estimated to be 67%. On the basis of early 1978 dollars the total plant cost is $942 million, and the total capital requirement is $1191 million. The estimated price of the product gas is based on utility-type financial factors. With milled peat at 75 cents/10/sup 6/ Btu, the 20-year average price of product is $3.06/10/sup 6/ Btu. The gas price sensitivity to peat cost: a 1 cent change in peat cost changes gas price by about 2 cents. A modification of the base case in which the milled peat is dried to 35% H/sub 2/O in an external peat-fueled dryer before feeding to the PEATGAS reactor was also evaluated. Preliminary evaluation of the modifieddesign indicates a possible savings of about 25 cents in the gas price because the dryer heat load in the gasifier is reduced and results in savings of oxygen and process steam.
- Research Organization:
- Institute of Gas Technology, Chicago, IL (United States)
- DOE Contract Number:
- EX-76-C-01-2469
- OSTI ID:
- 6245791
- Report Number(s):
- FE-2469-34
- Country of Publication:
- United States
- Language:
- English
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010404* - Coal
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090121 - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)