A coal-thermal co-mining method based on high ground temperature mine

Abstract

The invention discloses a coal-heat co-mining method based on a high ground temperature mine. The method uses a goaf formed after coal mining as a reservoir; at the same time, a geothermal well is excavated into a thermal reservoir in a roadway. Hot water is pumped out through a geothermal exploitation well, and cold water is recharged through a geothermal recharging well; at the same time, a WSHP(Water Source Heat Pump) heat exchange station and a wind source heat pump station are built on surface to recover heat energy in the hot water and the hot wind. Through the method, coal mining can effectively change structure of a underground rock stratum, and exert a certain pressure relief and anti-reflection effect on the thermal reservoir, thereby improving heat extraction efficiency of thegeothermal well; by the method, the waste high ground temperature mine can also be reused for reproduction; the extracted geothermal resources are energy-saving and emission-reducing; and the geothermal well is excavated in the mine, which greatly reduces mining depth of the geothermal well, reduces drilling difficulty, shortens drilling cycle and reduces mining cost.

Description

Technical field[0001]The invention relates to a method for co-mining coal and thermal energy, in particular to a method for co-mining coal and thermal energy based on a high ground temperature mine, and belongs to the field of coal mining and thermal energy mining.Background technique[0002]In recent years, with the high-intensity and large-scale development of coal resources, coal resources in the shallow parts of my country's central and eastern mining areas have gradually depleted, and coal mining has moved to the deep underground. As of 2016, my country has more than 50 mines with a depth of more than 1,000m, distributed in areas such as Yanzhou mining area, Huainan mining area, Pingdingshan mining area, Xuzhou mining area, and most of these mines are under high geothermal gradient conditions. In the mine, the high ground temperature and heat hazard in the mine seriously affects production efficiency and production safety.[0003]During the period from the late 1990s to 2014 in Chi...

AI Technical Summary

Problems solved by technology

[0003] From the late 1990s to 2014 in China, a total of 70,000 coal mines were closed nationwide. The transformation and utilization of abandoned mines developed slowly. At present, the utilization mode of abandoned mines in foreign countries is mainly to build mine parks, develop underground space, mine Associated resources, etc., but the high-temperature geothermal heat in mines has always been regarded as heat damage, but as an energy source, it has been ignored

Images