The pattern of exploitation and utilization of geothermal energy in China is gradually becoming clear

The first domestic geothermal cascade utilization national demonstration project - Boye "power generation + industrial application + heating + modern agriculture" integration project has been started, which is higher than 90 ° C for geothermal power generation, 70 ° C ~ 90 ° C for heating, and the remaining tail water for agricultural irrigation. After completion, the installed geothermal power generation capacity will be 5 megawatts and the heating area will be 2 million square meters.

The composite energy utilization system launched in Xinji, Hebei Province in 2013, through geothermal energy, solar energy, biomass energy and other renewable energy and industrial waste heat and conventional energy composite energy utilization, combined with energy dynamic regulation technology system integration, improve energy development and utilization efficiency. It is expected that by 2030, Xinji will form: the leather industrial zone will use deep geothermal energy, sewage source heat pump, industrial waste heat and solar energy to jointly heat; The new town Clean Chemical Park uses deep geothermal energy, industrial waste heat and solar energy to provide heat; The southern area of the central city is dominated by geothermal, supplemented by industrial waste heat, while the other areas of the central city are dominated by deep geothermal heating, supplemented by shallow geothermal energy. Deep geothermal heat is used for central heating in each township. By then, with the municipal construction, the heating area will reach 60 million square meters.

In the petrochemical industry, a number of industrial and civil demonstration projects have been initially built to convert the waste heat of low-grade reinjection sewage into heat sources that can meet the needs of crude oil transport and water heating as well as remote mining areas, replacing the past fuel oil and natural gas heating furnaces, and the effect of energy saving and emission reduction is remarkable.

Actively participate in major national projects

Geothermal resources are generally divided into two ways according to different temperatures: power generation and direct utilization. High temperature geothermal resources are mainly used for power generation; Moderate and low temperature geothermal resources are mainly used directly. For shallow geothermal energy below 25 ° C, ground source heat pumps can be used for heating and cooling.

Geothermal central heating, instead of coal-fired heating boilers and direct-fired loose coal. At present, China's heating boilers and direct-burning loose coal are about 600 million to 700 million tons/year, and vigorously develop geothermal heating has a very important role in improving the atmospheric environment. It is reported that by the end of 2015, China has formed an annual use of geothermal heating/cooling area of 494 million square meters, to replace 14.5 million tons of standard coal, reduce carbon dioxide 37.5 million tons, bringing good economic benefits, social benefits and environmental benefits.

The Fifth Plenary Session of the 18th CPC Central Committee proposed to promote low-carbon and circular development, build a clean, low-carbon, safe and efficient modern energy system, and implement the near-zero carbon emission zone demonstration project. This provides a broad development space for the large-scale utilization of geothermal resources.

Wang Yanxin told reporters that now Sinopec new Star company in Xiongxian pilot, not only for urban heating, but also began to combine with the construction of new rural areas around the city, has signed an agreement with nine towns, in addition to ensuring the heating of Xiongxian urban areas, but also to ensure new rural heating. It is reported that during the 13th Five-Year Plan period, 650,000 square meters of new rural heating is planned, and 480,000 square meters of heating demand has been achieved.

As we all know, the total direct utilization of geothermal resources in China has ranked first in the world for many years. At the end of 2014, the direct use of geothermal in China has undergone gratifying changes, and the proportion of geothermal heating exceeds that of hot spring bathing for the first time, of which the ground source heat pump is 58%, the geothermal heating is 19%, and the hot spring bath is 18%. The energy and technology of geothermal exploitation in China are more prominent. However, by the end of 2015, China's total installed geothermal power capacity was only 27.88 megawatts.

"There is still some way to go to achieve commercial use of dry hot rock, and the problem now is that there are technical bottlenecks, many can not be used, and the efficiency can be used is not too high." Warm Tibetan areas, light Tibetan areas, geothermal can do a lot of work in poverty alleviation and wealth." At the 2016 China International Mining Conference, Wang Guiling, director of the Institute of Hydrogeology and Environmental Geology of the China Geological Survey, introduced that according to the survey and evaluation of geothermal resources conducted by the China Geological Survey during the "Twelfth Five-Year Plan" period, if the implementation of recharge, geothermal heating can replace 1.884 billion tons of standard coal, geothermal power generation has 1/3 of the power generation potential of the Three Gorges power Station. It is of great significance to improve the energy structure of our country.