Geothermal power in China

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Overview[edit]

Geothermal power station in Yangbajain

Geothermal energy exploitation in China started c. 1970. In the socialist planned economy geothermal exploration was handled by national bodies with public investments. Drilled productive wells were transferred free of charge to the final user. Since the mid-1980s, under the framework of privatization and liberalization of the economy, national investment in exploration has been reduced. No new plants have been commissioned in the period 2000–2005 (Zheng et al., 2005; Battocletti et al., 2000). The only electricity-producing fields are located in Tibet. According to the "2005 Chinese Geothermal Environment Bulletin" by China's Ministry of Land and Resources, the direct utilization of geothermal energy in China will reach 13.76 cubic meters per second, and the geothermal energy will reach 10,779 megawatts, ranking first in the world [1]. However such programme has not been started so far.

The most important field is Yangbajing, with eight double flash units for a total capacity of 24 MW, fueled from a water dominated shallow reservoir at 140 °C – 160 °C with 18 wells of average depth 200 m. The field extension is only 4 km2, although there are clear indications of a total thermal anomaly of 15 km2. The annual energy production is approximately 100 GW·h, about 30% of the needs of the Tibetan capital, Lhasa. A deep reservoir has been discovered beneath the shallow Yangbajing field. It is characterized by high temperatures (250–330 °C has been measured at 1,500–1,800 m depth). The field potential is estimated at about 50–90 MW. It is still un-exploited. A 2,500 m deep well has been drilled in 2004, reaching the deep reservoir at 1,000–1,300 m. Its evaluation is ongoing.

Additional plants are installed in Langju, West Tibet (two double flash unit, 1 MW each, 80–180 °C) and a 1 MW binary power station (60–170 °C) is operating in Nagqu. Two small 300 kW plants are operating in Guangdong and Hunan.

Taken from Ruggero Bertani's paper, " World Geothermal Generation 2001-2005: State of the Art", published in Proceedings of the World Geothermal Congress 2005, Antalya, Turkey, 24–29 April 2005.

Direct uses[edit]

Total thermal installed capacity in MWt: 3,687.0

Direct use in TJ/yr: 45,373.0

Direct use in GW·h/yr: 12,604.6

Capacity factor: 0.39

This country is again one of the major users of the direct-use of geothermal energy. Zheng et al. (2005) discusses the latest developments. It appears that along with the restructuring of the economy, national investment in geothermal has decreased. However, as the living standard of the population has risen, geothermal has found favor in that the waters are used more for health, tourism, and balneology in various hot springs. Investors are looking to increase their investment, which has led to an upsurge in geothermal drilling and utilization particularly in the coastal regions of Beijing and Tianjin. The management of the resource also plays a big role particularly in the large cities. Here, efficiency in utilization has improved dramatically and environmental concerns are being addressed. For example, in Beijing the total rate of extraction of hot water has been kept stable and has even decreased slightly but energy utilization in terms of GWh produced has increased significantly. The data of Zheng et al. (2005) show that for the whole of China the installed capacity has risen to 3,687 MWt with an annual energy use of 45,373 TJ/yr (including 15 heat pump units ranging from 220 to 760-kW in capacity operating at an equivalent 2,880 full-load hours annually), from the 2000 (Lund and Freeston, 2001) figures of 2,282 MWt and 37,908 TJ/yr an increase in annual energy use of about 20%.

Geothermal space heating covers 12.7 million m2 and greenhouse heating cover about 1.33 million m2. There are about 1,600 public hot spring bathing houses and swimming pools, including about 430 where balneology and medical practices prevail in the country. The details of the specific uses are as follows: district heating (550 MWt and 6,391 TJ/yr); greenhouse heating (103 MWt and 1,176 TJ/yr); fish farming (174 MWt and 1,921 TJ/yr); agricultural drying (80 MWt and 1,007 TJ/yr); industrial process heat (139 MWt and 2,603 TJ/yr); bathing and swimming (1,991 MWt and 25,095 TJ/yr); other uses (monitoring) (19 MWt and 611 TJ/yr); and heat pumps (631 MWt and 6,569 TJ/yr).

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