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Oil Shale Utilization in Israel: the First Year of Combustion Demonstration Plant Operation

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Oil Shale Utilization in Israel: the First Year of Combustion Demonstration Plant Operation OIL SHALE UTILIZATION IN ISRAEL: THE FIRST YEAR OF COMBUSTION DEMONSTRATION PLANT OPERATION A. KAISER PAMA (Energy Resources Development) Ltd, Mishor Rotem ABSTRACT. Geological surveys have confirmed the existence of substantial Israeli oil shale reserves. The proven reserves contain approximately 12 billion tons of available ore, and the potential is deemed to be much higher. Economic studies conducted by PAMA indicate promising potential for power generation via Israeli oil shale combustion. Electric power from oil shale appears competitive with power generated from coal fired power plants located along the coast. PAMA's demonstration power plant has been in operation since the end of 1989. Based on the successful results of the first year of operation, PAMA and IEC are now engaged in a pre-project program for a 1000 MW commercial oil shale fired power plant, based on eight 120 MW units; the first unit is scheduled to begin operation in 1996. INTRODUCTION much larger oil shale reserves, prompted the MOEI Oil shales are sedimentary rocks containing a and some major Israeli energy companies to form petroleum-like substance called "kerogen," whose PAMA, a company for commercial exploitation of age is estimated by geologists as 70 million years. oil shale in Israel. The financial structure of PAMA Oil shale reserves are the only major fossil fuel is shown in Figure 1. resource which has been discovered in Israel so far. The shale deposits have been found all over the BASIC APPROACH AND ACTIVITIES country, but the largest reserves are in the Northern As is well known, the mineral and chemical industry Negev. is typically capital intensive, and the economy of Oil shale exploration in the area began in the scale has a very significant effect on it Israeli oil 1930's with geological surveys mainly — to locate shale is a low quality material with poor energy oil shale deposits. During the fifties and the sixties content (about 14% organic matter). Thus, from the research activity was begun on oil shale properties. outset it was obvious that the oil shale industry In the early seventies, the Rotem-Yamin deposit was would require large and expensive installations. discovered and R&D on combustion technology Nevertheless, given the economic constraint of our picked up considerable momentum. country, coupled with the high risk development In the late 1970s, under the sponsorship of the program envisaged, a cautious strategy was adopted Ministry of Energy and Infrastructure (MOEI), the incorporating two main guidelines: R&D activity in this area significantly increased. The • Disregarding the economy of scale impact of the oil crisis, combined with indications of considerations during the first development stages with preference for low risk over GOVERNMENT INDUSTRY 50% 50% economic optimization. So, the development strategy is based on small modular units; Israel Chemicals Ltd. — 25% •In the quest for suitable technologies, all Israel's Ministry of Energy Oil Refineries Lid. — 25% traditional stages of development should be implemented. The Israel Electric Corp. — 50% PAMA's development effort is concentrated on proceeding simultaneously in two main lines of activity: j| PAMA {EflcijyRcjourcclDciclufmicnl) Lid. jj • The development/adaption of a commercial Goal: Commercial Utilization Of Israel's Oil St&re Resource technology for shale's oil production (retorting); • The development/adaption of a commercial Fig. 1. Financial structure of PAMA technology for oil shale combustion. 16 OH. SHALE UTIEATON IN ISRAR A. KAISER The R&D program is structured according to the The biggest deposit, which has been the most classical three stage development plan: thoroughly studied, is the Rotem-Yamin deposit, • Feasibility study, including piloting and formerly called the Efe deposit The northern techno-economic evaluation; part of the deposit contains about 2.S billion tons • Demonstration stage, completed by erection and of mineable ore and the southern part about S operation of small scale units; billion tons of mineable ore. • Commercial program with erection and • PAMA Center operation of full scale commercial facilities. PAMA has established its center adjacent to the To date, PAMA has successfully concluded the Rotem-Yamin deposit The center contains pilot feasibility stage, meeting the following targets: units, laboratory and support facilities which • Reserves enable PAMA to examine, adapt and develop Large-scale deposits containing over 12 billion technologies suitable for the commercial tons of oil shale have been identified and utilization of Israeli shale. characterized (Figure 2); The oil shale deposits • Technology found in Israel are equivalent to 600 million tons Oil production from shale as well as oil shale of crude oil. Since Israel consumes nearly 11 combustion have been successfully proven in million tons of oil equivalent (TOE) annually, several laboratory and pilot plants, both in Israel the nation's oil shale reserves are sufficient to and abroad. It was also found that by supply Israel's total fuel consumption for 50 conventional methods die upgrading of extracted years. oil to a higher quality product is possible. • Techno-economic potential PAMA identified and tested a number of processes that reached advanced stages of development Several processes were found to be suitable for synthetic fuel production and direct combustion. u r F>K* 1 POWER i C,u 1 FEED MINE PREPARATION RETORTS 1 GENERAL OIL SEHVICT-S TREATMENT FAClLmES UPGttMJING > Anvnoui L '— fliury tuniu r Agih>mented Find | Gil PI^NT l.Shcfa/am i 1 2. Hadcra LJ 3. Natu Mus i 4. Hjrtuv FEED 5. Shcqcf MINE | PREPARATION RFTTORTS 6 7. Efral Bc'cr Shcva 1 R Rnttm (Zcfa-Efe) 9. Mtihot Yajnin ID. Zavoa 1 1. Ycrnham 1 2. Oron OrNFRAL OIL stfl victs TREATMENT i. BiqalZm 1 UPGRADING 4. Shivia FAHI nii;S S ZinSynclme 6. Natal H 7Nirdinc 1 Fig 2. Oil shale resources in Israel (April 1984) Fig. 3. Alternatives for oil production by oil shale retorting 17 ISRAEL — USSR ENERGY CONFERENCE MAV 13-15,1991 Two extensive techno-economic evaluations were made by PAMA as part of the feasibility study for oil Summary of Results shale utilization. The first study examined a large-scale oil production plant with the following characteristics: •Oil production rate: 18,000 barrels per day • Oil production rate —18,000 barrels a day; • Investment: about 1 billion dollars • Investment — approximately 1 billion dollars; • Discount rate —12%; • Operating cost: about 1 hundred million dollars per year • Operating cost —100 million dollars per year, ' Production duration: 20 years • Project duration — 20 years. This study was carried out in 1982-1983, when oil prices reached levels of 40 dollars per barrel. Results Production Cost of One Oil Barrel of the study indicated a price range of 30-35 dollars per barrel, demonstrating that such utilization would be technically feasible and under certain conditions economically viable from the national standpoint discount rate 12% cost of money (Figures 3 and 4). 30 -35 dollars = The second study indicated promising potential for large-scale power generation from Israeli shale. operating cost This study was motivated by a comparison showing that oil shales could be provided at approximately half the cost of equivalent coal (Table 1). So, it examined the trade-off between the lower fuel prices and the higher investment and operation costs Fig. 4. Production of oil from shale — an economic needed for an oil shale power plant, as compared to evaluation. coal combustion. The study concluded that a 600 MW station, powered by oil shale would generate There is another reason to develop the combustion electricity at a cost compatible to large scale coal process — a combustion plant, combined with an fired coastal power plants (Table 2). Figure 5 is a oil-extraction plant, is an essential condition for large schematic presentation of PAMA's shales scale oil production from shales, improving the combustion pilot plant. economics of both. Table 1. Comparison of coal and oil shale cost COAL OILSHALE Low heating value 6125 Kcal/Kg 700 Kcal/Kg Price per ton $ 55-65 $2.5 Efficiency of coastal coal plant = 1.34 Efficiency of inland oil shale plant 6125 $ Shale cost in equivalent price of coal: 2.5 x x 1.34 ~ 30 — 700 ton Table 2. Comparative cost ofpower generation from coal and oil shale in 600 MW stations. < in centslKWh, 1986 US $) TYPE OF PLANT COAL COAL OIL OIL SHALE Discount Rate INLAND SEA SHORE SHALE (20% HIGHER INVESTMENT) 12% 5.0 4.2 4.1 4.5 8% 4.2 3.6 3.4 3.7 18 A. KAISER OIL SHALE UTUZATON IN ISRAEL BUCKET ELEVATOR FLUID BED COMBUSTOR CYCLONE SECONDARY CRUSHER • PRIMARY CRUSHER Fig. S. PAMA's fluidized bed combustion pilot plant Having concluded the feasibility stage, PAMA study the combustion of Israeli oil shale at a began the construction of a demonstration unit for sufficient scale to resolve the technical and economic direct combustion of oil shale. Given the recent issues associated with large scale commercial plants decline in oil prices, the company decided to thereby reducing the uncertainties and risks. Table 3 postpone construction of the retorting demonstration lists the design parameters of the demonstration unit, while concentrating instead on developing an plant The plant is producing electricity for the advanced extraction process tailored to the specific central grid, as well as low-pressure steam, utilized properties of Israeli shale. directly by Negev Phosphates Ltd. Figure 7 presents The objective of the recently constructed the oil
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