Study on the suitability of New Zealand coals for hydrogen production

Clemens, Tony; Gong, Desmond; Pearce, Steven

doi:10.1016/j.coal.2005.05.006

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…1 is 499.2 PJ. The chemical composition of New Zealand coal has been found to be suitable for gasification into hydrogen (Clemens et al, 2006) and a prototype gasifier that produces fuel cell grade hydrogen is currently being tested (Brown et al, 2005). However, CO 2 emissions would be a major consideration if hydrogen were to be produced in this manner, and this has yet to be addressed.…”

Section: New Zealand Energy Systemmentioning

confidence: 98%

System-level energy efficiency is the greatest barrier to development of the hydrogen economy

Page

Krumdieck

2009

Energy Policy

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Section: New Zealand Energy Systemmentioning

confidence: 98%

System-level energy efficiency is the greatest barrier to development of the hydrogen economy

Page

Krumdieck

2009

Energy Policy

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“…New Zealand (NZ) also plays a role on the global stage by having coal resources equivalent to 30−40 times the size of Maui, its largest gas discovery with 100 000 PJ available. , There is concern over NZ’s gas supply ten years from now . Moreover, at $70 USD/barrel, NZ spends about $2−4.5 billion per annum on imported hydrocarbons. , An alternative solution embraced by Solid Energy, NZ’s largest coal miner, and recognized by the NZ Energy Strategy is gasification technology which is pertinent for conversion into transport fuels and as a mainstay driver for a possible future hydrogen economy. , Accordingly, Solid Energy is currently exploring a NZ $1 billion plant for converting coal into petrol using the FT process. It is envisaged that this could supply a third of NZ’s petrol…”

Section: Introductionmentioning

confidence: 99%

Gasification of New Zealand Coals: A Comparative Simulation Study

2008

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The aim of this study was to conduct a preliminary feasibility assessment of gasification of New Zealand (NZ) lignite and sub-bituminous coals, using a commercial simulation tool. Gasification of these coals was simulated in an integrated gasification combined cycle (IGCC) application and associated preliminary economics compared. A simple method of coal characterization was developed for simulation purposes. The carbon, hydrogen, and oxygen content of the coal was represented by a three component vapor solid system of carbon, methane, and water, the composition of which was derived from proximate analysis data on fixed carbon and volatile matter, and the gross calorific value, both on a dry, ash free basis. The gasification process was modeled using Gibb’s free energy minimization. Data from the U.S. Department of Energy’s Shell Gasifier base cases using Illinios No. 6 coal was used to verify both the gasifier and the IGCC flowsheet models. The H:C and O:C ratios of the NZ coals were adjusted until the simulated gasifier output composition and temperature matched the values with the base case. The IGCC power output and other key operating variables such as gas turbine inlet and exhaust temperatures were kept constant for study of comparative economics. The results indicated that 16% more lignite than sub-bituminous coal was required. This translated into the requirement of a larger gasifier and air separation unit, but smaller gas and steam turbines were required. The gasifier was the largest sole contributor (30%) to the estimated capital cost of the IGCC plant. The overall cost differential associated with the processing of lignite versus processing sub-bituminous coal was estimated to be of the order of NZ $0.8/tonne.

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