CN108643956A - Geothermal power generation cooling system is utilized in deep well in mine exploitation - Google Patents

Abstract

The invention discloses a cooling system using geothermal power generation in deep mine mining. The geothermal power generation and cooling system is used in deep mine mining, including serpentine pipes, heat pumps, hot water tanks, cold water tanks, thermoelectric generators, grid-connected inverters, and refrigeration devices; the serpentine pipes are arranged in the main shaft, ventilation shaft and Heat collection is carried out in the working roadway, one end of which is connected to the refrigeration device, and the other end is connected to the heat pump; the cold water entering from the refrigeration device or its cold water injection port collects the heat of the deep well of the mine through the serpentine tube, and then enters the heat pump; the heat pump converts the warm water into The temperature difference water leads to the hot water tank and the cold water tank respectively; the hot water tank and the cold water tank are connected with a thermoelectric generator for power generation, and the generated direct current is converted into an alternating current through a grid-connected inverter and connected to the grid; the thermoelectric generator After the energy is collected, the water in the hot water tank and the cold water tank is passed into the refrigeration device; the cold water obtained by the refrigeration device enters the serpentine tube to collect heat and circulates.

Description

Using geothermal power generation and cooling system in deep mine mining

technical field

The invention belongs to the technical field of mining, and in particular relates to a cooling system utilizing geothermal power generation in deep mine mining.

Background technique

With the development of science and technology and the advancement of mining technology, the mining of mines is also developing deeper and deeper. The mining depth depends not only on the mining technology, but also on the working environment of the deep mine roadway. Because all mineral resources that need to be mined through mines, including coal, metal and non-metallic ores, etc., will encounter heat damage caused by high mine temperatures when they reach a certain mining depth. When the ambient temperature in the mine exceeds the temperature that can be tolerated by the normal thermal balance of the human body, it will reduce the labor efficiency of workers, increase the frequency of accidents, damage health, and even heatstroke shock, etc. Excessively high temperatures will also cause equipment to fail to work normally. Therefore, prevention and control of geothermal hazards must be carried out in deep mine mining.

At present, the control measures for mine heat damage usually include: improving mine ventilation, spraying technology to reduce air temperature, and personal cooling work clothes, etc. Some mines also pass low-temperature gas or low-temperature water into the underground to reduce the overall temperature of the mine. The disadvantage of improving mine ventilation is that it needs to consume a lot of electricity; the disadvantage of spraying technology is that there are large limitations in the layout of the site; the disadvantage of cooling clothing is that it cannot provide all-round cooling, and at the same time restricts the movement of underground personnel and affects work efficiency; The disadvantage of introducing low-temperature gas and low-temperature water is that the effect is better in the shallow well area, and the cooling effect in the deep well is not obvious. Therefore, there is not a very ideal method for the prevention of deep well heat damage at present.

Contents of the invention

The purpose of the present invention is to solve the problem of geothermal disasters in deep well mining, and proposes a self-circulation system that uses deep well geothermal energy to generate temperature difference and cool down, which can effectively alleviate geothermal disasters, and utilize geothermal power generation for electrical appliances in mines to improve underground work surroundings.

In order to achieve the above purpose, the following technical solutions are adopted:

Geothermal power generation and cooling system used in deep mine mining, including serpentine tubes, heat pumps, hot water tanks, cold water tanks, thermoelectric generators, grid-connected inverters, and refrigeration devices;

The serpentine pipe is arranged in the main shaft, ventilation shaft and working roadway to collect heat, one end of which is connected to the refrigeration device, and the other end is connected to the heat pump; the cold water entering from the refrigeration device or its cold water injection port is collected through the serpentine pipe in the deep mine well of heat, which then enters the heat pump;

The heat pump converts the warm water flowing out after collecting heat from the serpentine tube into temperature difference water, which leads to the hot water tank and the cold water tank respectively;

The hot water tank and the cold water tank are connected with a thermoelectric generator to generate electricity, and the generated direct current is converted into alternating current through a grid-connected inverter and connected to the power grid;

After the thermoelectric generator collects energy, the water in the hot water tank and the cold water tank is passed into the refrigeration device; the cold water obtained by the refrigeration device enters the serpentine tube to collect heat and circulates.

According to the above scheme, the electric current generated by the thermoelectric generator is used to support the work of the refrigeration device and the heat pump.

Compared with the prior art, the present invention has the following advantages:

1) It can effectively alleviate geothermal disasters in deep wells, provide a more comfortable working environment for underground personnel and machinery, and improve production efficiency;

2) After the system enters the working state, it is completely driven by geothermal heat, which reduces the power consumption of mines, saves energy and costs, and conforms to the theme of green mines;

3) The heat collecting device of the system is laid on the roadway and shaft wall, which will not affect the mine production, will not produce harmful substances, and does not need to occupy too much space.

Description of drawings

Figure 1: The working diagram of the present invention utilizing geothermal power generation and cooling system;

Fig. 2: the 3D simulation diagram of serpentine tube of the present invention;

Fig. 3: the sectional view of serpentine pipe of the present invention;

Fig. 4: the working principle diagram of the heat pump of the present invention;

1-heat pump, 2-hot water tank, 3-cold water tank, 4-thermoelectric generator, 5-grid inverter, 6-refrigeration device, 7-serpentine tube, 8-evaporator, 9-condenser, 10-compressor, 11-expansion valve.

Detailed ways

The technical solution of the present invention is further explained below in conjunction with specific examples, but it is not intended to limit the protection scope of the present invention.

The present invention uses geothermal power generation and cooling system in deep mine mining, as shown in accompanying drawing 1: includes serpentine tube 7, heat pump 1, hot water tank 2, cold water tank 3, thermoelectric generator 4, grid-connected inverter 5, refrigeration device 6;

The serpentine tube 7 is arranged in the main shaft, the ventilation shaft and the working roadway to collect heat, one end of which is connected to the refrigeration device 6, and the other end is connected to the heat pump 1; the cold water entering from the refrigeration device 6 or its cold water injection port passes through the serpentine Pipe 7 collects the heat from the deep well of the mine, and then enters the heat pump 1;

The heat pump 1 makes temperature difference water from the hot water flowing out after collecting heat from the serpentine tube 7, and leads to the hot water tank 2 and the cold water tank 3 respectively;

The hot water tank 2 and the cold water tank 3 are connected with a thermoelectric generator 4 to generate electricity, and the generated direct current is converted into alternating current through a grid-connected inverter 5 and connected to the power grid;

After the thermoelectric generator 4 collects energy, the water in the hot water tank and the cold water tank is passed into the refrigeration device 6; the cold water obtained by the refrigeration device enters the serpentine tube to collect heat and circulates.

Wherein, the serpentine pipe is shown in accompanying drawings 2 and 3, the serpentine pipe is close to the rock wall, and is designed as a flat shape, which increases the contact area with the rock wall, and the flowing water therein fully absorbs the heat in the rock, and at the same time The side of the serpentine tube facing the air is covered with thermal insulation material to reduce the diffusion of heat into the air, achieve a better cooling effect, and improve the heat collection efficiency at the same time. The serpentine pipes are arranged in stages to form a small regional circulation and save the power consumption of water lifting.

After the warm water in the serpentine tube is passed into the heat pump, a part of it releases heat to cool down, and the cooling water is passed into the cold water tank; the other part absorbs the heat released by the cooling water and heats up, and the heated water is passed into the hot water tank; In this way, the water flow has a large temperature difference and is used to generate electricity.

The working principle of the heat pump is shown in Figure 4. When the warm water collected by the serpentine pipe flows into the evaporator 8, it will release the stored heat and cool it down and inject it into the cold water tank. At the same time, the refrigerant evaporates and absorbs in the evaporator 8. The generated steam is inhaled by the compressor 10 and compressed to a higher pressure and enters the condenser 9. The refrigerant steam is condensed in the condenser, and at the same time, it releases heat and heats warm water and injects it into the hot water tank. The liquid refrigerant enters the expansion valve 11 , expand adiabatically, do work externally, make it reach a very low temperature, and then enter the evaporator to absorb the heat stored in the water for the next cycle.

The thermoelectric generator is connected to the grid-connected inverter, and the power generated by the thermoelectric generator is direct current, which needs to be converted into alternating current through the grid-connected inverter, and its output voltage is basically the grid voltage, which may be slightly increased , the output current is generally a sinusoidal waveform, the frequency and phase are completely consistent with the mains, and can be directly connected to the mine power grid for use by electrical appliances.

After the water in the hot water tank and the cold water tank undergoes power generation, the temperature difference becomes smaller, and after being mixed, it is passed into the refrigeration device. After the water temperature is lowered, the cold water is pumped out by the water pump, and then passed into the serpentine pipeline again, so as to realize cooling and heat exchange. collected to form a water cycle in the area. The refrigeration device, heat pump, etc. can use the electric energy generated by the thermoelectric generator to solve the geothermal hazard in deep wells without consuming external power, and at the same time, the electric energy can also be used by electrical appliances such as fans in the mine and hoisting devices.

Claims (2)

1. The use of geothermal power generation and cooling system in deep mine mining is characterized by including serpentine tubes, heat pumps, hot water tanks, cold water tanks, thermoelectric generators, grid-connected inverters, and refrigeration devices; The serpentine pipe is arranged in the main shaft, ventilation shaft and working roadway to collect heat, one end of which is connected to the refrigeration device, and the other end is connected to the heat pump; the cold water entering from the refrigeration device or its cold water injection port is collected through the serpentine pipe in the deep mine well of heat, which then enters the heat pump; The heat pump converts the warm water flowing out after collecting heat from the serpentine tube into temperature difference water, which leads to the hot water tank and the cold water tank respectively; The hot water tank and the cold water tank are connected with a thermoelectric generator to generate electricity, and the generated direct current is converted into alternating current through a grid-connected inverter and connected to the power grid; After the thermoelectric generator collects energy, the water in the hot water tank and the cold water tank is passed into the refrigeration device; the cold water obtained by the refrigeration device enters the serpentine tube to collect heat and circulates. 2. Utilize geothermal power generation cooling system in deep mine mining as claimed in claim 1, it is characterized in that the electric current that thermoelectric generator produces is used for supporting the work of refrigerating device and heat pump.