Ground source heat comprehensive utilization system and heat supply method

Abstract

A ground source heat comprehensive utilization system comprises a heat pump unit, a rock stratum heat exchange system, a heat storage system, a mine cooling system and a control system. The heat pump unit is connected with the rock stratum heat exchange system, the heat storage system and the mine cooling system, temperature and flow control is carried out, deep geothermal energy can be utilized more efficiently and more reasonably, by arranging a plurality of water supply / return paths, the requirement for underground mining operation can be met, and the requirement for hot water of users on the ground can also be met. A heat pipe is embedded in the deep surrounding rock, heat energy in the mine surrounding rock is sucked out and exchanges heat with low-temperature water in the heat pump unit, then the quality of low-grade heat energy is improved, then the low-grade heat energy is supplied to different places for use, the power consumption of the whole process is higher than that of the prior art using a high-power fan to supply air, the system has great industrial value and environmental protection value, in addition, the temperature and the water flow of each subsystem are controlled through the control system, and the comfort degree of operators in a deep mine is improved.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a ground source heat comprehensive utilization system and a heat supply method. Background technique [0002] With the increase of the mining depth of metal mines in recent years, the temperature of the surrounding rock in the mine has also gradually increased. The high temperature of the mine has become one of the major problems in the mining of metal mines. The academic circles generally believe that the limit depth of metal mines in the future is not only determined by mining machinery. The level depends on the cooling technology of the mine. According to the calculation of the average geothermal gradient of 0.035°C / m in my country, the temperature of the surrounding rock at a kilometer depth is 35°C higher than that of the constant temperature zone on the surface. For example, when the temperature of the constant temperature layer on the surface is 15°C, The temperature of the s...

AI Technical Summary

Problems solved by technology

[0002] With the increase of the mining depth of metal mines in recent years, the temperature of the surrounding rock in the mine has also gradually increased. The high temperature of the mine has become one of the major problems in the mining of metal mines. The academic circles generally believe that the limit depth of metal mines in the future is not only determined by mining machinery. The level depends on the cooling technology of the mine. According to the calculation of the average geothermal gradient of 0.035°C / m in my country, the temperature of the surrounding rock at a kilometer depth is 35°C higher than that of the constant temperature zone on the surface. For example, when the temperature of the constant temperature layer on the surface is 15°C, The temperature of the surrounding rock at a depth of one meter will be above 50°C. It is conceivable that workers will not be able to work normally if there is no mine ventilation system to cool down the mine at a depth of 1,000 meters.

[0003] The heat sources in deep mines mainly include: heat release from surrounding rocks, heat dissipation from mining machinery, oxidation heat release, and air self-compression, etc. Among them, heat release from surrounding rocks accounts for about 57%, heat dissipation from mining machinery accounts for about 15-20%, and oxidation Heat release accounts for 12%, and air flow self-compression accounts for about 9%. It can be seen that mine heat damage is mainly affected by heat release of surrounding rocks, and there are usually two methods to eliminate heat release of surrounding rocks: when the depth of deep mine mining does not exceed When the depth is 1600mm, a high-power ventilation system can meet the requirements. When the deep mining depth exceeds 1600m, a refrigeration system must be used to cool down. However, due to mining depth and cost reasons, most domestic mines currently use a ventilation system to cool down. However, the metal mining operation cycle is long, the high-power ventilation system works for a long time, and the power consumption is huge, and when there are too many corridors in the deep mine, the power consumption of the ventilation system will far exceed the power consumption of mining machinery. In addition, The temperature of the surrounding rock in the deep layer is relatively high, and direct discharge may easily cause the ambient temperature at the pit outlet to be too high, forming a local heat island effect, and easily causing waste of heat energy

Images