CN109883074B - System for extracting geothermal energy from goaf filling body and working method thereof - Google Patents
System for extracting geothermal energy from goaf filling body and working method thereof Download PDFInfo
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- CN109883074B CN109883074B CN201910246097.7A CN201910246097A CN109883074B CN 109883074 B CN109883074 B CN 109883074B CN 201910246097 A CN201910246097 A CN 201910246097A CN 109883074 B CN109883074 B CN 109883074B
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- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a system for extracting geothermal energy from a goaf filling body and a working method thereof. The mining steps are as follows: and injecting a heat storage medium required for collecting geothermal heat into the flow conveying pipeline, heating the heat storage medium after flowing through the heat collecting pipe arranged in the filling body, conveying the heated heat storage medium to a power generation workshop through the return pipeline, cooling the heat storage medium after power generation and utilization, and recycling the heat storage medium into the flow conveying pipeline, so that the heat energy in the goaf filling body is extracted. The main system comprises a flow delivery system, a reflux system, a heat collection system and a heat collection and power generation system. The invention can realize the synergy of deep mineral resource filling mining and geothermal mining, the interference among all the processes is small, the temperature of a stope can be reduced, the power generation equipment is arranged underground, a high-power lifting pump is not needed, the energy consumption is low, and the method is a green and efficient deep mine geothermal energy mining method.
Description
Technical Field
The invention belongs to the field of deep geothermal exploitation and the technical field of filling exploitation, is particularly suitable for the technical field of cooperative co-exploitation of deep coal resources and geothermal resources, and particularly relates to a system for extracting geothermal energy from a goaf filling body and a working method thereof.
Background
The mining is gradually carried out along with the gradual depletion of shallow mineral resources in China. But the increasing of the mining depth causes the temperature of the stope to be overhigh, and the life safety of stope operating personnel is seriously influenced. Geothermal heat is not only a heat hazard, but also an energy source. When the deep mine is used for mining, the geothermal energy is used for not only reducing the temperature of a stope, but also generating electricity.
The filling mining can realize the control of the movement of the rock stratum while mining mineral resources, reduce the subsidence of the earth surface, protect the stability of the aquifer, treat wastes, prevent and control disasters, and is an important direction for the development of the mining technology. The method is used for solving the heat damage while exploring how to utilize the filling mining technology to realize green, safe and efficient mining, and has very important significance for utilizing geothermal energy.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a system for extracting geothermal energy from a goaf filling body and a working method thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a method for extracting geothermal energy from a goaf filling body mainly extracts the thermal energy in the filling body by arranging a heat collecting pipeline in the goaf filling body. And injecting a heat storage medium required for collecting geothermal heat into the flow conveying pipeline, heating the heat storage medium after flowing through the heat collecting pipe arranged in the filling body, conveying the heated heat storage medium to a power generation workshop through the return pipeline, cooling the heat storage medium after power generation and utilization, and recycling the heat storage medium into the flow conveying pipeline, so that the heat energy in the goaf filling body is extracted. The method mainly comprises the following steps: the system comprises a flow delivery system, a reflux system, a heat collection system and a heat collection and power generation system.
The flow conveying system is characterized in that: the flow conveying system equipment comprises a flow conveying pipeline, a flow conveying pump and a heat storage medium replenishing valve. The flow delivery pipeline is made of heat insulation materials, so that heat exchange of the heat storage medium in the transportation process is reduced. The flow feeding pipeline is laid to a stoping roadway corresponding to the filling and heat-collecting working face from the front end of the heat-collecting power generation system, and the pipeline is laid along the original roadway of the mine without newly digging the roadway.
The backflow system is characterized in that: the return system equipment comprises a return pipeline and a return pump. The return pipeline and the flow delivery pipeline have the same material and have heat insulation performance. The sections of the flow conveying pipeline and the return pipeline at the working face are respectively positioned in two different stoping roadways. The return pipeline is laid to a corresponding stoping roadway of the filling and heat-collecting working face from the tail end of the heat-collecting power generation system, and the pipeline is laid along the original roadway of the mine without newly digging the roadway.
The heat collecting system is characterized in that: the heat collecting system equipment comprises a heat collecting pipe, heat conducting silicone grease, a heat collecting pipe fixing device, and a linking device of the heat collecting pipe, a flow conveying pipeline and a return pipeline. The heat collecting pipe adopts a pipe body with excellent heat conducting performance, and in order to increase the contact compactness between the pipe body and the filling body and increase the heat conduction coefficient, heat conducting silicone grease is coated around the heat collecting pipe. The heat collecting pipe is in a snake shape and is arranged along the direction of the working surface and respectively connected with the flow conveying pipeline and the return pipeline. The snakelike plane of the snakelike heat collecting pipe is perpendicular to the top bottom plate of the working face, and the bent parts at two sides of the snakelike heat collecting pipe are respectively fixed on the top bottom plate by using a fixing device. The installation form of the heat collecting pipe can realize one-time full-height filling of filling operation without layered filling and solidification waiting time.
The heat collection and power generation system is characterized in that: the heat collecting and power generating system equipment comprises water storage equipment, flash evaporation equipment and power generating equipment. Because the temperature of a filling body of a deep mine suitable for mining is generally difficult to reach the boiling point of a heat storage medium, the heat storage medium is difficult to form steam after heat absorption to push a generator to operate, and low-pressure flash evaporation equipment is generally adopted to gasify the heat storage medium, so that a turbine is pushed to generate electricity. In addition, power generation can be performed by using thermal expansion energy without using steam. The power generation principle of the generator can be that power generation equipment is arranged underground, so that the problems of difficult pumping of the heat storage medium of the deep well and high energy consumption can be solved.
The heat storage medium is characterized in that: the heat storage medium can be liquid with larger specific heat capacity and lower boiling point, such as water, ethanol and the like, and can adopt a single medium form or a double medium form. The single medium is only one heat storage medium adopted in the whole geothermal exploitation and utilization system, the double media is one medium adopted in the flow conveying pipeline, the heat collecting pipeline and the return pipeline, and the other medium adopted in the heat collecting and power generating system. The double-medium type has the advantages that the medium with lower boiling point and higher cost can be adopted in the heat collecting and power generating system, the gasification efficiency of the heat storage medium is improved, and the cheap and environment-friendly medium is adopted in other systems, so that the power generating efficiency is improved, and the economic cost is reduced.
The process flow between geothermal mining and filling coal mining comprises the following steps: the filling mining method can be paste filling, high-water filling and roadway-by-roadway cemented filling, and different filling mining methods have different corresponding technological processes.
When paste filling and high water filling are carried out, the process flow between geothermal mining and filling coal mining is as follows: along with the advance of the working face, the bag hanging filling section and the open type filling section are arranged at intervals, wherein the heat collecting pipeline is arranged at the open type filling section, and the filling operation of the open type filling section is carried out after the bag hanging filling operation and the heat collecting pipeline are both installed at two sides. The heat collecting pipeline is connected with the backflow pipeline and the flow conveying pipeline after being installed, a complete loop is formed, and heat storage media are communicated to realize geothermal exploitation and utilization.
When roadway-by-roadway cemented filling mining is carried out, the process flow between geothermal mining and filling coal mining is as follows: the method comprises the steps of firstly tunneling a filling connection roadway by a fully-mechanized excavating machine (a continuous miner), installing a heat production pipeline in the filling connection roadway after tunneling, and filling the filling connection roadway after the heat production pipeline is installed. And the heat collecting pipeline is connected with the backflow pipeline and the flow delivery pipeline after being installed to form a complete loop, and then the heat storage medium is led → the starting flow delivery pump → the heat collection and the power generation are carried out.
The heat pipe fixing device is characterized in that: the fixing device is a U-shaped sleeve with two lugs, and holes for fixing are respectively arranged on the two lugs of the U-shaped sleeve. The heat pipe is sleeved by the U-shaped sleeve, and the heat pipe is fixed in a mode of hammering the anchoring rod body to the top bottom plate.
Has the advantages that: compared with the prior art, the system for extracting geothermal energy by the goaf filling body and the working method thereof provided by the invention have the following advantages: the invention can realize the cooperation of deep mineral resource filling mining and geothermal mining, and has small interference among filling, coal mining and heat collecting processes. The operation of the geothermal mining system can reduce the temperature of a stope, and geothermal power generation can be used for mine production and the life of residents in mining areas. The power generation equipment is arranged underground, a small height difference exists between the flow delivery system and the backflow system, a high-power lifting pump is not needed, and energy consumption is low. The heat storage medium used by the heat collecting system is in a closed system, can be recycled, and cannot cause pollution and waste. The geothermal mining system is based on the existing filling coal mining production system, a new tunnel does not need to be dug on a working face, the added cost is low, and the geothermal mining system can be used for a new mine and can also be used for the reconstruction of an old mine. In conclusion, the method for extracting geothermal energy from the goaf filling body is a green and efficient method for exploiting geothermal energy from deep mines.
Drawings
FIG. 1: a heat collection utilization system overall schematic diagram;
FIG. 2: pipeline layout of paste filling/high water filling working face heat collection system;
FIG. 3: a pipeline layout of a heat collection system of the roadway-by-roadway cemented filling working face;
FIG. 4: a schematic diagram of installation and fixation of the heat collecting pipe;
in the figure: 1-a streaming system; 1.1-a heat storage medium replenishing valve; 1.2-flow pump; 2-heat collecting system; 3-a reflux system; 3.1-reflux pump; 4-heat collection and power generation system; 5-filling section of filling bag; 6-open filling section; 7-a heat collecting pipe; 8-a flow delivery pipeline; 9-a return line; 10-mining a roadway I on a working face; 11-working face mining roadway II; 12-a mining machine; 13-filling the hydraulic support; 14-a coal body; 15-cementing the filling body; 16-spacing coal pillars; 17-a goaf; an 18-U shaped sleeve; 18.1-U-shaped sleeve fixing holes; 19-working face top plate; 20-working face bottom plate.
Detailed Description
The invention is further described with reference to the following figures and examples.
The invention mainly extracts the heat energy in the filling body in the goaf by arranging the heat collecting pipeline in the filling body. And injecting a heat storage medium required for collecting geothermal heat into the flow conveying pipeline, heating the heat storage medium after flowing through the heat collecting pipe arranged in the filling body, conveying the heated heat storage medium to a power generation workshop through the return pipeline, cooling the heat storage medium after power generation and utilization, and recycling the heat storage medium into the flow conveying pipeline, so that the heat energy in the goaf filling body is extracted. The method mainly comprises the following steps: a flow delivery system 1, a reflux system 3, a heat collection system 2 and a heat collection and power generation system 4, as shown in figure 1.
The flow feeding system 1 comprises a flow feeding pipeline 8, a flow feeding pump 1.2 and a heat storage medium replenishing valve 1.1. The flow delivery pipeline is composed of 8 heat insulating materials, and heat exchange of the heat storage medium in the transportation process is reduced. The flow delivery pipeline 8 is laid to a working face stoping roadway I10 corresponding to a filling and heat-mining working face from the front end of the heat collection power generation system 4, and the pipeline is laid along the original roadway of the mine without newly digging the roadway.
The return system 3 comprises a return line 9 and a return pump 3.1. The return pipeline 9 and the flow delivery pipeline 8 are made of the same material, have heat insulation performance, and are all heat-insulating pipes, the types of the heat-insulating pipes can be selected from steel-sleeve-steel composite type, polyurethane type or other types, and the pipe diameter is determined by the flow of the heat storage medium. The sections of the flow conveying pipeline 8 and the return pipeline 9 at the working face are respectively positioned in two different stoping roadways. The return pipeline 9 is laid to a working face extraction roadway II 11 corresponding to the filling and heat extraction working face from the tail end of the heat collection power generation system 4, and the pipeline is laid along the original roadway of the mine without newly digging the roadway.
The heat collecting system 2 comprises a heat collecting pipe 7, heat conducting silicone grease, a heat collecting pipe fixing device, and a linking device of the heat collecting pipe, a flow conveying pipeline and a return pipeline. The heat collecting pipe adopts a pipe body with excellent heat conducting performance, and in order to increase the contact compactness between the pipe body and the filling body and increase the heat conduction coefficient, heat conducting silicone grease is coated around the heat collecting pipe. The heat collecting pipe is in a snake shape and is arranged along the direction of a working surface and is respectively connected with a flow conveying pipeline 8 and a return pipeline 9. The snakelike plane of the snakelike heat collecting pipe is perpendicular to the top bottom plate of the working face, and the bent parts at two sides of the snakelike heat collecting pipe are respectively fixed on the top bottom plate by using a fixing device. The installation form of the heat collecting pipe can realize one-time full-height filling of filling operation without layered filling and solidification waiting time. The heating pipe fixing device is a U-shaped sleeve with two lugs, and U-shaped sleeve fixing holes 18.1 for fixing are respectively arranged on the two lugs of the U-shaped sleeve. The heat pipe is sleeved by the U-shaped sleeve, and the heat pipe is fixed in a mode of punching an anchoring rod body to the top bottom plate, as shown in fig. 4.
The heat collecting and generating system 4 comprises water storage equipment, flash evaporation equipment and generating equipment. Because the temperature of a filling body of a deep mine suitable for mining is generally difficult to reach the boiling point of a heat storage medium, the heat storage medium is difficult to form steam after heat absorption to push a generator to operate, and low-pressure flash evaporation equipment is generally adopted to gasify the heat storage medium, so that a turbine is pushed to generate electricity. In addition, power generation can be performed by using thermal expansion energy without using steam. The power generation principle of the generator can be that power generation equipment is arranged underground, so that the problems of difficult pumping of the heat storage medium of the deep well and high energy consumption can be solved.
The heat storage medium can be liquid with larger specific heat capacity and lower boiling point, such as water, ethanol and the like, and can adopt a single medium form or a double medium form. The single medium is only one heat storage medium adopted in the whole geothermal exploitation and utilization system, the double media is one medium adopted in the flow conveying pipeline, the heat collecting pipeline and the return pipeline, and the other medium adopted in the heat collecting and power generating system. The double-medium type has the advantages that the medium with lower boiling point and higher cost can be adopted in the heat collecting and power generating system, the gasification efficiency of the heat storage medium is improved, and the cheap and environment-friendly medium is adopted in other systems, so that the power generating efficiency is improved, and the economic cost is reduced.
The process flow between geothermal mining and filling coal mining comprises the following steps: the filling mining method can be paste filling, high-water filling and roadway-by-roadway cemented filling, and different filling mining methods have different corresponding technological processes.
As shown in fig. 2, the process flow between geothermal mining and filling coal mining during paste filling and high water filling is as follows: along with the advance of the working face, filling bag filling sections 5 such as a hanging bag filling section and an open type filling section 6 are arranged in the goaf at intervals, wherein a heat production pipeline is arranged in the open type filling section 6, and the filling operation of the open type filling section 6 is carried out after the hanging bag filling operation on two sides and the installation of the heat production pipeline are finished. The heat collecting pipeline 7 is connected with the return pipeline 9 and the flow delivery pipeline 8 after being installed to form a complete loop, and geothermal exploitation and utilization can be carried out through the heat storage medium. Along the face of the coal 14, the mining machine 12 performs mining work with the hydraulic support 13 in place.
As shown in fig. 3, during roadway-by-roadway cemented filling mining, the process flow between geothermal mining and filling coal mining is as follows: the method comprises the steps of firstly tunneling a filling connection roadway by a fully-mechanized excavating machine (continuous miner), installing a heat collecting pipeline 7 in the filling connection roadway of the goaf 17 at two sides of the spacing coal pillar 16 after tunneling is finished, and filling a cemented filling body 15 in the filling connection roadway after the heat collecting pipeline 7 is installed. The heat collecting pipeline 7 is connected with the return pipeline 9 and the flow delivery pipeline 8 after being installed to form a complete loop, and geothermal exploitation and utilization can be carried out through the heat storage medium.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (2)
1. The utility model provides a system for collecting space area obturator draws geothermal energy which characterized in that: the mining goaf heat collection and power generation system comprises a circulation system formed by sequentially interconnecting a flow delivery pipeline (8), a heat collection pipeline (7), a return pipeline (9) and a heat collection and power generation system (4), wherein the flow delivery pipeline (8) and the return pipeline (9) are respectively positioned in two different stoping roadways at the working face section, one end of the flow delivery pipeline is connected with the heat collection pipeline (7) arranged in a goaf filling body, and the other end of the flow delivery pipeline is connected with the underground heat collection and power generation system (4); a heat storage medium required for collecting geothermal heat is injected into the flow conveying pipeline (8); the heat collection and power generation system (4) comprises water storage equipment, flash evaporation equipment and power generation equipment, and the power generation equipment is arranged underground;
the working method of the system for extracting geothermal energy by the goaf filling body comprises the following steps: the heat energy in the filling body is extracted in a mode of arranging a heat collecting pipeline (7) in the goaf filling body: heat storage media required for collecting geothermal heat are injected into the flow conveying pipeline (8), the heat storage media are heated after flowing through a heat collecting pipeline (7) arranged in the filling body, and are conveyed to a power generation workshop of the heat collecting and power generating system (4) through a return pipeline (9), the heat storage media are cooled after being used for power generation, and are circulated into the flow conveying pipeline (8) again, and the circulation is carried out, so that the extraction of the heat energy in the goaf filling body is realized;
when the paste filling and high water filling method is adopted, the process flow between geothermal mining and filling coal mining is as follows: along with the advance of the working face, a filling bag filling section (5) and an open type filling section (6) are arranged at intervals, wherein a heat collecting pipeline (7) is arranged on the open type filling section (6), and the filling operation of the open type filling section (6) is carried out after the operations of the filling bag filling sections (5) on two sides and the installation of the heat collecting pipeline (7) are finished; the heat collecting pipeline (7) is connected with the return pipeline (9) and the flow conveying pipeline (8) after being installed, a complete loop is formed, and heat storage media are introduced for geothermal exploitation and utilization;
when the lane-by-lane cemented filling mining method is adopted, the process flow between geothermal mining and filling coal mining is as follows: firstly, a filling connection roadway is tunneled by the fully-mechanized excavating machine, a heat collecting pipeline (7) is arranged in the filling connection roadway after tunneling is finished, and the filling connection roadway is filled after the heat collecting pipeline (7) is arranged; the heat collecting pipeline (7) is connected with the return pipeline (9) and the flow conveying pipeline (8) after being installed, a complete loop is formed, and heat storage media are introduced for geothermal exploitation and utilization;
the flow delivery pipeline (8) and the return pipeline (9) both adopt heat-insulating pipes, the types of the heat-insulating pipes are steel-sheathed-steel composite type, polyurethane type or other types, and the pipe diameters are determined by the flow of heat storage medium;
the flow delivery pipeline (8) is laid to a working face stoping roadway I (10) corresponding to a filling and heat-collecting working face from the front end of the heat collecting and generating system (4), and a flow delivery pump and a heat storage medium supplement valve are arranged on the flow delivery pipeline; the return pipeline (9) is laid to a working face recovery roadway II (11) corresponding to the filling and heat-collecting working face from the tail end of the heat-collecting and power-generating system (4), and a return pump is arranged on the return pipeline; the flow delivery pipeline (8) and the return pipeline (9) are laid along the original roadway of the mine;
the heat collecting pipeline (7) is a heat conducting pipe body coated with heat conducting silicone grease on the outer surface; the heat collecting pipeline (7) is in a snake shape, the snake-shaped plane is arranged perpendicular to the top bottom plate of the working surface, and the bent parts at the two sides of the heat collecting pipeline (7) are respectively fixed on the top bottom plate;
the heating pipeline (7) respectively fixes the bent parts at two sides of the snakelike heating pipe on the top bottom plate by using a heating pipe fixing device, the heating pipe fixing device is a U-shaped sleeve with two lugs, and U-shaped sleeve fixing holes (18.1) for fixing are respectively arranged on the two lugs of the U-shaped sleeve; the heat collecting pipeline (7) is sleeved by the U-shaped sleeve, and the heat collecting pipeline (7) is fixed in a mode of punching an anchoring rod body to the top bottom plate.
2. The system for extracting geothermal energy from a goaf fill in accordance with claim 1, wherein: the heat storage medium is liquid with high specific heat capacity and low boiling point, including water and ethanol; either in single media form or dual media form.
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| CN110318675B (en) * | 2019-07-01 | 2020-11-03 | 山东科技大学 | Deep coal bed gas thermal co-production method |
| CN111561297B (en) * | 2020-05-18 | 2021-03-30 | 中国矿业大学 | Coal-geothermal water collaborative mining method based on fault water-flowing fractured zone |
| CN111997612B (en) * | 2020-07-24 | 2021-07-06 | 中国矿业大学 | Deep mine geothermal energy and coal resource fluidization collaborative mining method |
| CN111927454B (en) * | 2020-09-04 | 2022-04-01 | 山东科技大学 | Ultra-long drilling water exploration and geothermal integrated mining method for deep coal seam |
| CN111911159B (en) * | 2020-09-04 | 2022-01-11 | 山东科技大学 | Deep coal seam mining goaf filling geothermal mining method |
| CN112031774B (en) * | 2020-09-04 | 2022-12-27 | 山东科技大学 | Deep coal seam goaf buried pipe heat extraction method |
| CN112325684A (en) * | 2020-11-12 | 2021-02-05 | 西安科技大学 | Deep well filling body radiation cooling stope cooling and heating system and application method |
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