Galoter process

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  2. Oil shale technology
  3. Energy in Estonia


Galoter process
Enefit process
Process type Chemical
Industrial sector(s) Chemical industry
oil industry
Feedstock oil shale
Product(s) shale oil
Leading companies Eesti Energia
VKG Oil
Main facilities Narva Oil Plant
Petroter
Inventor Krzhizhanovsky Power Engineering Institute
Developer(s) Eesti Energia
Outotec

The Galoter process (also known as TSK, UTT, or SHC; its newest modifications called Enefit and Petroter) is a shale oil extraction technology for a production of shale oil, a type of synthetic crude oil. In this process, the oil shale is decomposed into shale oil, oil shale gas, and spent residue. A decomposition is caused by mixing raw oil shale with a hot oil shale ash, generated by combustion of carbonaceous residue (semi-coke) in the spent residue. The process was developed in 1950s and it is used commercially for the shale oil production in Estonia. There are projects for further development of this technology and for expansion of its usage, e.g. in Jordan and USA.

History

Research of the solid heat carrier process for pyrolysis of lignite, peat, and oil shale started in 1944 at the G. M. Krzhizhanovsky Power Engineering Institute of Academy of Sciences of the USSR.[1] At the laboratory scale, the Galoter process was invented and developed in 1945–1946.[2] The process was named Galoter after the research team leader I. Galinker who's name was combined with the word "thermal".[1][3]

The further research continued in Estonia. A pilot unit with capacity of 2.5 tonnes of oil shale per day was built in Tallinn in 1947.[1][3] The first Galoter-type commercial scale pilot retorts were built at Kiviõli, Estonia, in 1953 and 1963 (closed in 1963 and 1981 respectively) with capacities of 200 and 500 tonnes of oil shale per day respectively.[2][3][4][5] The Narva Oil Plant, annexed to the Eesti Power Plant and operating two Galoter-type 3000 tonnes per day retorts, was commissioned in Estonia in 1980.[4][5][6] These retorts were designed by AtomEnergoProject and developed in cooperation with the Krzhizhanovsky Institute.[1][4] Started as a pilot plant, the process of converting it to commercial scale plant took about 20 years. During this period, the company has modernized more than 70% of the equipment compared to the initial design.[2]

In 1978, a 12.5-tonnes pilot plant was built in Verkhne-Sinevidnoy, Ukraine. It was used for testing of Lviv–Volinsk lignite, and Carpathian, Kashpir (Russia) and Rotem (Israel) oil shales. In 1996–1997, a test unit was assembled in Tver.[1]

In 2008, Estonian energy company Eesti Energia, an operator of Galoter retorts at the Narva Oil Plant, established a joint venture with the Finnish technology company Outotec called Enefit Outotec Technology to develop and commercialize a modified Galoter process–the Enefit process–which combines the current process with circulating fluidized bed technologies.[7]

Technology

Galoter retort

The Galoter process is an above-ground oil-shale retorting technology classified as a hot recycled solids technology.[8] The process uses a horizontal cylindrical rotating kiln-type retort, which is slightly declined.[9] It has similarities with the TOSCO II process.[10][11]

Before retorting, the oil shale is crushed into fine particles with a size of less than 25 millimetres (1.0 in) in diameter. The crushed oil shale is dried in the fluidized bed drier (aerofountain drier) by contact with hot gases.[4][12] After drying and pre-heating to 135 °C (275 °F), oil shale particles are separated from gases by cyclonic separation. Oil shale is transported to the mixer chamber, where it is mixed with hot ash of 800 °C (1,470 °F), produced by combustion of spent oil shale in a separate furnace.[13] The ratio of oil shale ash to raw oil shale is 2.8–3:1.[4] The mixture is moved then to the hermetic rotating kiln. When the heat transfers from the hot ash to raw oil shale particles, the pyrolysis (chemical decomposition) begins in oxygen deficit conditions.[13] The temperature of pyrolysis is kept at 520 °C (970 °F).[10] Produced oil vapors and gases are cleaned of solids by cyclones and moved to condensation system (rectification column) where shale oil condense and oil shale gas is separated in gaseous form.[4][9] Spent shale (semi-coke) is transported then to the separate furnace for combustion to produce hot ash. A portion of the hot ash is separated from the furnace gas by cyclones and recycled to the rotary kiln for pyrolysis.[13] The remaining ash is removed from the combustion gas by more cyclones and cooled and removed for disposal by using water.[4] The cleaned hot gas returns to the oil shale dryer.

The Galoter process has high thermal and technological efficiency, and high oil recovery ratio.[6][9] Oil yield reaches 85–90% of Fischer Assay and retort gas yield accounts for 48 cubic meters per tonne.[9] Oil quality is considered good, but the equipment is sophisticated and capacity is relatively low.[6] This process creates less pollution than internal combustion technologies, as it uses less water, but it still generates carbon dioxide as also carbon disulfide and calcium sulfide.[14]

Enefit process

Enefit process is a modification of the Galoter process being developed by Enefit Outotec Technology.[15] In this process, the Galoter technology is combined with proven circulating fluidized bed (CFB) combustion technology used in coal-fired power plants and mineral processing. Oil shale particles and hot oil shale ash are mixed in a rotary drum as in the classical Galoter process. The primary modification is the replacing of the Galoter semi-coke furnace with a CFB furnace. The Enefit process also incorporates fluid bed ash cooler and waste heat boiler commonly used in coal-fired boilers to convert waste heat to steam for power generation. Compared to the traditional Galoter, the Enefit process allows complete combustion of carbonaceous residue, improved energy efficiency by maximum utilization of waste heat, and less water use for quenching. According to promoters, the Enefit process has a lower retorting time compare to the classical Galoter process and therefore its has a greater throughput. Avoidance of moving parts in the retorting zones increases their durability.[16]

Commercial use

Two Galoter retorts built in 1980 are used for oil production by the Narva Oil Plant, a subsidiary of the Estonian energy company Eesti Energia.[17] Both retorts process 125 tonnes per hour of oil shale.[18] The annual shale oil production is 135,000 tonnes and oil shale gas production is 40 million cubic metres per annum (1.4×10^9 cu ft/a).[2] The company is building a new plant employing its newer Enefit process with a processing capacity of 2.26 million tonnes of oil shale per year and producing 290,000 tonnes of shale oil and 75 million cubic metres (2.6×10^9 cu ft) of oil shale gas. It is planned to become operational by 2012.[19] In addition, Eesti Energia plans to begin construction of a similar Enefit plant in Jordan by 2015[20] and in USA by 2017.[21]

VKG Oil, a subsidiary of Viru Keemia Grupp, constructed a new Galoter retort (Petroter) at Kohtla-Järve that is similar to the two retorts operating at Narva. The basic engineering of the retort was done by Atomenergoproject of Saint Petersburg. The basic engineering of the condensation and distillation plant was done by Rintekno of Finland.[22] The plant has a processing capacity of 1.1 million tonnes of oil shale per year and it produces 100,000 tonnes of shale oil, 30 million cubic metres (1.1×10^9 cu ft) of oil shale gas, and 150 GWh of steam per year. Operation started in December 2009.[23] The company plans to start construction of the second Petroter plant in 2012.[24]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Script error
  2. ↑ 2.0 2.1 2.2 2.3 Petersen, Ilmar (2006-09-07). "The Unique Experience of Oil Shale Utilization at Narva Power Plants (NPP)" (PDF). World Energy Council. Executive Council. Tallinn, Estonia: WEC-Estonia. http://www.wec-estonia.ee/energy_day/fscommand/Ilmar_Petersen_WEC.pdf. Retrieved 2009-07-10.
  3. ↑ 3.0 3.1 3.2 Script error
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Script error
  5. ↑ 5.0 5.1 Script error
  6. ↑ 6.0 6.1 6.2 Script error
  7. ↑ "Eesti Energia, Outotec to form oil shale processing JV". Energy Business Review (Progressive Media Group). 2008-12-17. http://www.energy-business-review.com/news/eesti_energia_outotec_to_form_oil_shale_processing_jv_171208. Retrieved 2009-07-10.
  8. ↑ Burnham, Alan K.; McConaghy, James R. (2006-10-16). "Comparison of the acceptability of various oil shale processes" (PDF). 26th Oil shale symposium. Golden, Colorado: Lawrence Livermore National Laboratory. p. 17. UCRL-CONF-226717. https://e-reports-ext.llnl.gov/pdf/341283.pdf. Retrieved 2008-12-06.
  9. ↑ 9.0 9.1 9.2 9.3 Qian, Jialin; Wang Jianqiu (2006-11-07). "World oil shale retorting technologies" (PDF). Amman, Jordan: International Oil Shale Conference. http://www.sdnp.jo/International_Oil_Conference/rtos-A118.pdf. Retrieved 2008-12-13.
  10. ↑ 10.0 10.1 Script error
  11. ↑ Script error
  12. ↑ Script error
  13. ↑ 13.0 13.1 13.2 Soone, Jüri; Riisalu, Hella; Kekisheva, Ljudmilla; Doilov, Svjatoslav (2006-11-07). "Environmentally sustainable use of energy and chemical potential of oil shale" (PDF). Amman, Jordan: International Oil Shale Conference. http://www.sdnp.jo/International_Oil_Conference/rtos-A104.pdf. Retrieved 2008-12-06. "Dry oil shale leaves the drier at temperature up to 135 °C and then is mixed with solid heat carrier – hot ash (750 – 800 °C) – at a ratio of 1,8/1. The ash is obtained by combustion of spent residue in a separate furnace. Mixture of oil shale and heat carrier is fed into a horizontal rotating retort."
  14. ↑ Script error
  15. ↑ Rikken, Kristopher (2011-06-28). "Enefit Gets Lookover from Utah Officials". ERR. http://news.err.ee/economy/5b56f965-02fd-4adb-8cf5-6988361e1550. Retrieved 2011-06-30.
  16. ↑ Siirde, Andres; Martins, Ants (2009-06-07). "Oil shale fluidized bed retorting technology with CFB furnace for buring the by-products" (PDF). International Oil Shale Symphosium. Tallinn, Estonia: Tallinn University of Technology. http://www.oilshalesymposium.com/fileadmin/user_upload/documents/SIIRDE.pdf. Retrieved 2009-07-10.
  17. ↑ Script error
  18. ↑ Script error
  19. ↑ Mardiste, David (2009-05-22). "Estonia plans $260 mln oil shale plant, eyes nuclear". Reuters. http://uk.reuters.com/article/idUKLM70129220090522?sp=true. Retrieved 2009-07-10.
  20. ↑ "Jordan Oil Shale Project". Omar Al-Ayed, Balqa Applied University. 2008. Archived from the original on 2008-06-03. http://web.archive.org/web/20080603231353/http://www.jordanoilshale.net/page4.aspx. Retrieved 2008-08-15.
  21. ↑ Mikk, Harri (2011-06-03). "Introduction to Enefit" (PDF). Unconventional Fuel Conference. Salt Lake City, Utah: University of Utah. http://www.icse.utah.edu/assets/archive/2011/assets/pdfs/enefit_mikk_2011.pdf. Retrieved 2011-06-24.
  22. ↑ Script error
  23. ↑ Script error
  24. ↑ Roman, Steve (2011-03-08). "VKG Preparing to Build Second Shale Oil Plant". ERR. http://news.err.ee/economy/76a616ec-d3db-48e3-96b4-d252b4e6ff24. Retrieved 2011-03-20.


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