WO2018126572A1

WO2018126572A1 - Direct power generation device embedded in fire extinguishing drill hole in coalfield fire area

Info

Publication number: WO2018126572A1
Application number: PCT/CN2017/082986
Authority: WO
Inventors: 仲晓星; 汤研; 张新浩; 李光宇; 王德明
Original assignee: 中国矿业大学
Priority date: 2017-01-09
Filing date: 2017-05-04
Publication date: 2018-07-12
Also published as: CN106787074A

Abstract

Disclosed in the present invention is a direct power generation device embedded in a fire extinguishing drill hole in a coalfield fire area, comprising: a high heat-conduction vacuum tube, a radiating fin, and a refrigerant working medium, which together form a cooling module, the refrigerant working medium being stored in the high heat-conduction vacuum tube; the high heat-conduction vacuum tube is provided within a regular prism cavity formed by the enclosing of a temperature difference power generation module and is internally tangent within the cavity to form a cooling section of the cooling module; the upper end of the high heat-conduction vacuum tube extends out of a high heat-conduction cylindrical shell to form a heat-dissipation section of the cooling module; the heat-dissipation section of the cooling module is attached with heat-dissipation fins; the high heat-conduction cylindrical shell is externally connected to the regular prism cavity formed by enclosing the temperature difference power generation module, and gaps between the high heat-conduction vacuum tube and the temperature difference power generation module and gaps between the temperature difference power generation module and the high heat-conduction cylindrical shell are filled with high heat-conduction fillers; and the temperature difference power generation module is connected to an energy storage battery by means of wires. The present invention is simple in structure, can be recycled and can realize direct power generation within the drill holes, improving the thermoelectric conversion rate in the fire area while reducing the temperature of the fire area, thereby managing the fire area.

Description

Coal mine fire area fire extinguishing borehole embedded direct power generation device

Technical field

The invention relates to a coal mine fire extinguishing and drilling internal embedded direct power generating device, belonging to the field of thermoelectric conversion equipment.

Background technique

Coal field fire refers to the phenomenon that large-area coal combustion occurs when underground coal seams are ignited by natural or human factors and gradually develop along the coal seam into large-scale coal damage caused by coal resources and the surrounding environment. The coal field fire area has a large burning area and high temperature. There is also huge heat in the fire area. About 1 billion tons of coal is burnt down by underground coal fire every year, accounting for 12.5% of the total coal consumption, generating about 1000 GW of energy. , equivalent to 2.5 times the total energy produced by 500 nuclear power plants around the world.

In order to extract the thermal energy of the coal field fire area and convert it into electric energy, the patent document disclosed in CN106026778A discloses a system and method for the sustainable utilization of coal energy in the fire area of coal field and coal fire control, including: embedding horizontal steel pipe in the fire area of the coal field The heat carrier is used to extract the heat energy of the fire zone to the ground, and then the heat energy contained in the heat carrier is converted by the thermoelectric power generation module. The system and method first extracts the heat of the fire zone outside the fire zone, and then performs thermoelectric conversion of the extracted heat. It is impossible to realize the thermoelectric conversion of the heat in the fire zone directly inside the fire zone. Since the heat energy of the fire zone in the system reaches the thermoelectric power generation module, the heat transfer of the coal rock and the steel pipe, the heat conduction of the steel pipe wall and the heat carrier, and the heat carrier are required. The convective heat transfer, the heat carrier and the heat transfer of the thermoelectric module, the heat transfer process involved is numerous, which greatly increases the heat loss, especially the heat transfer between the heat carrier and the steel pipe wall and the flow of the heat carrier in the pipeline. The thermal process will result in a large degree of loss and loss of the extracted heat energy, resulting in low heat utilization rate in the fire zone. At the same time, the horizontal drilling needs to complete the drilling guide hole-reaming-drag-laying pipe and other processes, and the construction process is carried out in the high-temperature formation. It is difficult, the engineering quantity is large, and the pipeline is difficult to recycle and reuse, and the use cost is high. The thermal power generation in the fire zone is less suitable.

At present, vertical drilling is widely used in the treatment of coalfield fire zones to carry out fire fighting such as grouting. If the existing fire-extinguishing holes in the fire zone are used and direct thermoelectric conversion is performed therein, the cost and heat loss can be greatly reduced. To improve the power generation efficiency of thermal energy in the fire zone, but the vertical drilling power generation faces the following problems: 1. The coalfield fire zone is mostly in a remote wilderness area, and the water supply and power supply is difficult. The traditional power generation technology uses a large amount of water to circulate and heat in the borehole. The hot water body is transported to the surface and then generated by the thermoelectric conversion station set up on the surface. The power generation mode will face the problem of water shortage and equipment power supply difficulty. 2. The space inside the fire extinguishing hole is small, and the power generation device needs to meet small space. For the demand for efficient power generation, there are currently no related devices and methods for direct power generation in the fire-extinguishing space.

Therefore, those skilled in the art are working to develop a direct-fired direct-fired power generation device for a fire-extinguishing hole in a coal field fire area that is simple in operation, low in cost, high in heat utilization rate, and reusable, and can realize an external water supply and power supply condition in a coal field fire area. Direct power generation in the fire-fighting borehole to achieve efficient conversion of thermal energy in the fire zone and coal fire control.

Summary of the invention

OBJECT OF THE INVENTION In order to overcome the deficiencies in the prior art, the present invention provides an in-line direct power generation device for fire extinguishing and drilling of a coal field fire area, which has the characteristics of simple structure, convenient use and maintenance, and reusability, and can realize coal field fire. Direct power generation in the borehole of the area greatly simplifies the heat transfer process, improves the utilization of thermal energy, and at the same time reduces the temperature of the fire zone and achieves the purpose of controlling the fire zone.

Technical Solution: In order to achieve the above object, the technical solution adopted by the present invention is:

In-line direct power generation device for fire extinguishing and drilling of coal field fire area, including high heat conduction vacuum tube, thermoelectric power generation module, energy storage battery, high thermal conductivity cylindrical shell, high thermal conductivity filling body, heat dissipating fin and fire extinguishing hole, and temperature difference power generation The number of modules is not less than four;

Wherein, the high-heat-conducting cylindrical shell is disposed in a vertical fire-extinguishing borehole in a coal field fire zone, the upper end opening is flush with the top of the fire-extinguishing borehole and the bottom is closed; the thermoelectric power generation module has a rectangular plate shape and is vertically disposed at a height The heat-conducting cylindrical shell is filled with a refrigerant medium, and the high-heat-conducting vacuum tube, the heat-dissipating fin and the refrigerant medium constitute a cooling module; the high-heat-conducting vacuum tube is disposed in the positive prism chamber surrounded by the thermoelectric power generation module, and The cooling chamber of the cooling module is formed by the positive prism chamber enclosed by the thermoelectric power generation module; the upper end of the high thermal conductivity vacuum tube extends to the outside of the high thermal conductivity cylindrical housing to form a cooling section of the cooling module, and the heat dissipating section of the cooling module is provided with heat dissipating fins along the circumferential direction thereof; The inner wall of the high thermal conductivity cylindrical housing is externally connected to the positive prism cavity enclosed by the thermoelectric power generation module, and the gap between the high thermal conductivity vacuum tube and the thermoelectric power generation module, the gap between the thermoelectric power generation module and the high thermal conductivity cylindrical housing is made of a high thermal conductivity filling body. Filling; the thermoelectric power generation module and the energy storage battery set on the surface are connected by wires.

In the invention, the portion of the thermoelectric power generation module that is tangent to the high thermal conductivity vacuum tube is a cold end, and the heat is transferred to the surface through evaporation of the refrigerant medium in the high thermal conductivity vacuum tube, and the heat dissipating fin increases the heat exchange between the refrigerant medium vapor and the external environment. The area is accelerated to dissipate heat so that the steam is quickly condensed and returned to the cooling section of the cooling module. The circulation of the refrigerant medium can continuously transfer the heat in the area around the high heat conduction vacuum tube to the surface, so that the temperature difference power generation module in contact with the high heat conduction vacuum tube is cold. The end is maintained at a lower temperature. The end of the thermoelectric power generation module in contact with the inner wall of the high thermal conductivity cylindrical casing is a hot end, and the heat of the coal field fire zone is efficiently conducted to the hot end of the thermoelectric power generation module through the high thermal conductivity cylindrical casing and the high thermal conductivity filling body, and the heat transfer distance is short. Moreover, the thermal resistance is small, so that the cold and hot ends of the thermoelectric power generation module maintain a large temperature difference, thereby achieving high power generation efficiency.

Preferably, the refrigerant working medium is distilled water, and maintains a liquid state in a high heat conduction vacuum tube at a normal temperature, and the boiling point of the tube is lowered due to the negative pressure in the tube, the heat is easily evaporated, and the latent heat of evaporation is large, the heat energy can be efficiently carried, and the non-flammable and explosive are safe. Environmentally friendly, low cost, and the liquid filling rate in the high thermal conductivity vacuum tube is 20%-25%, which can efficiently transfer heat.

Preferably, the high thermal conductivity cylindrical housing has a diameter of 73-127 mm.

Preferably, the high thermal conductivity vacuum tube and the heat dissipating fin are made of metal copper, and the heat dissipating fin adopts a winding type, has strong heat conduction capability, is not easy to be corroded and damaged, and has a long service life.

Preferably, in order to ensure electrical safety, the wire is a flexible fireproof cable.

Preferably, the inner wall of the high thermal conductivity cylindrical housing is provided with a high temperature resistant thermocouple, and the power generating device can be taken out when the thermocouple shows a temperature of less than 50 °C.

Advantageous Effects: The present invention provides a coal mine fire zone fire-extinguishing bore-in-line direct power generation device, which has the following advantages over the prior art: 1. Simple structure, low cost, convenient use and maintenance, flexible mobile installation, and operation Safe and reliable, avoiding the problem of building a water supply system or erecting a power supply circuit; 2. The device can be taken out and reused when the heat extraction in the fire area is exhausted, which greatly reduces the cost, is safe and environmentally friendly, and has wide practicality; The heat transfer process in the coal field fire area effectively improves the heat energy utilization rate, effectively reduces the temperature of the fire zone, and achieves the purpose of controlling the fire zone; 4. Realizing direct power generation in the borehole of the coal field fire zone, by maintaining the temperature difference power generation module The large temperature difference between the hot and cold ends enables efficient power generation and good universality.

DRAWINGS

1 is a schematic overall structural view of an embodiment of the present invention;

The figure includes: 1, high thermal conductivity vacuum tube, 2, thermoelectric power generation module, 3, energy storage battery, 4, high thermal conductivity cylindrical housing, 5, high thermal conductivity filling body, 6, heat dissipation fins, 7, cooling module heat dissipation section, 8, cooling module refrigeration section, 9, refrigerant working fluid, 10, coalfield fire zone high temperature zone, 11, fire drilling.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 shows a coal mine fire zone borehole in-line direct power generation device, which is characterized in that it comprises a high thermal conductivity vacuum tube 1, a thermoelectric power generation module 2, an energy storage battery 3, a high thermal conductivity cylindrical housing 4, and a high thermal conductivity filling. Body 5, heat dissipating fins 6 and fire extinguishing holes 11, and the number of thermoelectric power generation modules 2 is not less than four;

The high-heat-conducting cylindrical casing 4 is disposed in the vertical fire-extinguishing hole 11 of the high-temperature zone 10 of the coal field fire zone, and the upper end opening is flat with the top of the fire-extinguishing hole 11 and the bottom is closed; the thermoelectric power generation module 2 has a rectangular plate shape. And vertically disposed in the high thermal conductivity cylindrical casing 4; the high thermal conductivity vacuum tube 1 stores a refrigerant medium 9, and the high thermal conductivity vacuum tube 1, the heat dissipating fins 6 and the refrigerant medium 9 constitute a cooling module; the high thermal conductivity vacuum tube 1 is disposed Cooling module cooling is formed in the positive prism cavity enclosed by the thermoelectric power generation module 2 and in the positive prism cavity enclosed by the thermoelectric power generation module 2 Section 8; the upper end of the high thermal conductivity vacuum tube 1 extends to the outside of the high thermal conductivity cylindrical housing 4 to form a cooling module heat dissipating section 7, and the cooling module heat dissipating section 7 is provided with heat dissipating fins 6 along the circumferential direction thereof; the inner wall of the high thermal conductivity cylindrical housing 4 is The positive prism chamber enclosed by the thermoelectric power generation module 2 is externally connected, and the gap between the high thermal conductivity vacuum tube 1 and the thermoelectric power generation module 2, the temperature difference power generation module 2 and the high thermal conductivity cylindrical housing 4 is filled by the high thermal conductive filling body 5; The thermoelectric power generation module 2 is connected to the energy storage battery 3 provided on the surface by a wire.

In the embodiment, the refrigerant working medium 9 is distilled water, which is safe, environmentally friendly and low in cost, can carry heat energy efficiently, and has a liquid filling rate of 24% in the high heat conduction vacuum tube, and can efficiently transfer heat; the high heat conductive cylindrical shell The height of the body 4 is 80 mm; the high heat conduction vacuum tube 1 and the heat dissipating fins 6 are all made of metal copper, and the heat dissipating fins 6 are wound; the wires are flexible fireproof cables; A high temperature thermocouple is attached to the inner wall.

Specific embodiments of the invention are as follows:

Firstly, a vertical fire-extinguishing hole 11 is set up in the high-temperature zone 10 of the coalfield fire zone, and the power-generating device is arranged in the fire-extinguishing hole 11; the high-temperature zone of the coal field fire zone contains high thermal energy, and the heat passes through the high-heat-conducting cylindrical shell. 4. The high thermal conductive filling body 5 is conducted to the hot end of the thermoelectric power generation module 2, and the refrigerant working medium 9 in the high thermal conductivity vacuum tube 1 rapidly extracts the heat around the cooling section 8 of the high thermal conductivity cooling module by evaporation and transmits it to the surface, and utilizes the cooling section of the cooling module. The heat dissipating fins 6 on the 7 cool down the steam and condense into a liquid working medium 9 and then flow back to the cooling section of the cooling module 8, and the heat in the peripheral area of the high thermal conductivity vacuum tube 1 can be continuously transmitted to the surface through the evaporation condensation cycle of the refrigerant medium 9. Therefore, the cold end of the thermoelectric power generation module 2 in contact with the high thermal conductivity vacuum tube 1 is maintained at a lower temperature. Therefore, the cold and hot ends of the thermoelectric power generation module 2 will maintain a large temperature difference, and the thermal energy can be continuously and efficiently converted into electric energy. . After a period of use, the power generator can be taken out when the thermocouple shows a temperature of less than 50 ° C and reused in other high temperature areas of the coal field fire zone.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

The utility model relates to a coal mine fire extinguishing borehole embedded direct power generating device, which is characterized in that it comprises a high thermal conductivity vacuum tube (1), a thermoelectric power generation module (2), an energy storage battery (3), a high thermal conductivity cylindrical housing (4), a high thermal conductivity filling body (5), a heat dissipating fin (6), and a fire extinguishing hole (11), and the number of the thermoelectric power generation modules (2) is not less than four;

Wherein, the high thermal conductivity cylindrical casing (4) is disposed in the vertical fire extinguishing hole (11) of the high temperature zone (10) of the coal field fire zone, and the upper end opening is flat with the top of the fire extinguishing hole (11) and the bottom is closed; The thermoelectric power generation module (2) has a rectangular plate shape and is vertically disposed in the high thermal conductivity cylindrical casing (4); the high thermal conductivity vacuum tube (1) stores a refrigerant working medium (9), and a high thermal conductivity vacuum tube (1), The heat dissipating fin (6) and the refrigerant working medium (9) constitute a cooling module; the high thermal conductivity vacuum tube (1) is disposed in the positive prism cavity enclosed by the thermoelectric power generation module (2), and is surrounded by the thermoelectric power generation module (2) The positive prism cavity is cut into a cooling module cooling section (8); the upper end of the high thermal conductivity vacuum tube (1) extends to the high heat conduction cylindrical casing (4) to form a cooling module heat dissipation section (7), and the cooling module heat dissipation section (7) The heat radiating fins (6) are arranged along the circumferential direction thereof; the inner wall of the high heat conductive cylindrical shell (4) is externally connected with the positive prism chamber surrounded by the thermoelectric power generation module (2), and the high heat conduction vacuum tube (1) and the temperature difference power generation The gap between the module (2), the thermoelectric power generation module (2) and the high thermal conductivity cylindrical housing (4) is filled by the high thermal conductive filling body (5); the thermoelectric power generation module (2) surface is provided with an energy storage battery (3) is connected by a wire.
The coal mine fire zone fire-extinguishing direct-embedded direct power generation device according to claim 1, wherein the refrigerant working fluid (9) is distilled water and the liquid filling rate in the high thermal conductivity vacuum tube (1) It is 20%-25%.
The coal mine fire zone fire-extinguishing in-line direct power generating device according to claim 1, wherein the high-heat-conducting cylindrical casing (4) has a diameter of 73-127 mm.
The coal mine fire extinguishing and drilling internal in-line direct power generating device according to claim 1, wherein the high thermal conductivity vacuum tube (1) and the heat dissipating fin (6) are made of metal copper, and the heat dissipating The fins (6) are wound around a sheet.
The coal mine fire zone fire-extinguishing in-line direct power generating device according to claim 1, wherein the wire is a flexible fireproof cable.
The coal mine fire zone fire-extinguishing in-line direct power generation device according to claim 1, characterized in that the inner wall of the high thermal conductivity cylindrical casing (4) is provided with a high temperature resistant thermocouple.