AU2017408795B2 - Method of utilizing downhole roadway in coal mine for compressed air energy storage - Google Patents

Method of utilizing downhole roadway in coal mine for compressed air energy storage Download PDF

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Publication number
AU2017408795B2
AU2017408795B2 AU2017408795A AU2017408795A AU2017408795B2 AU 2017408795 B2 AU2017408795 B2 AU 2017408795B2 AU 2017408795 A AU2017408795 A AU 2017408795A AU 2017408795 A AU2017408795 A AU 2017408795A AU 2017408795 B2 AU2017408795 B2 AU 2017408795B2
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Prior art keywords
roadway
compressed air
energy storage
air
coal mine
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AU2017408795A
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AU2017408795A1 (en
Inventor
Kangyu DENG
Jiangfeng LIU
Zhanguo MA
Xinran XUE
Kai Zhang
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Priority to CN2017110084238 priority Critical
Priority to CN201711008423.8A priority patent/CN109356650B/en
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to PCT/CN2017/111800 priority patent/WO2019080219A1/en
Publication of AU2017408795A1 publication Critical patent/AU2017408795A1/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/16Modification of mine passages or chambers for storage purposes, especially for liquids or gases

Abstract

Abstract The present invention discloses a method of utilizing a downhole roadway in a coal mine for compressed air energy storage, first, the cross section of a roadway is renovated, specifically 5 including: the rock mass of surrounding rock of the roadway is reinforced by high-pressure grouting, to form a bearing layer that is stable in a wide scope; a circular reinforced concrete lining is constructed according to the cross-sectional shape of the roadway, the inner surface of the lining is smoothened, and then a rubber or steel lining is bonded to the inner surface; the space between the original cross section of the roadway and the reinforced concrete lining 10 is filled by grouting; then the two end faces of the roadway are sealed; finally, a flexible air storage bag is placed in the treated roadway. In a working process, compressed air is stored and retrieved through an air inflow pipeline and an air outflow pipeline that are connected to the flexible air storage bag. The method provides an approach for compressed air energy storage in a downhole roadway in a coal mine, which is reliable, safe, and easy to maintain. 10691978_1 (GHMatters) P109774.AU

Description

Method of Utilizing Downhole Roadway in Coal Mine for Compressed Air Energy Storage
Technical Field
The present invention relates to the field of electric power generation by compressed air energy storage, particularly to a method of utilizing a downhole roadway in a coal mine for compressed air energy storage.
Background Art
Presently, the problem of unbalanced electric power load in China becomes worse increasingly, and the difference in electric power load is high between seasons or even between day and night. Therefore, the storage and rational utilization of electric power receives great attention. To overcome the challenge of large-scale electric power storage, all countries in the world have invested huge manpower and financial resources and developed various energy storage means, including storage batteries, flywheels, super capacitors, superconductive power storage devices, etc. However, these energy storage means are difficult to operate owing to low efficiency, short service life, inconvenient storage and access, low energy storage capacity, and high investment cost, etc.. Compared with other energy storage techniques, compressed air energy storage and power generation systems have 20 advantages including less investment, lower operation and maintenance cost, quicker dynamic response, more flexible operation mode, higher economic efficiency, less environmental pollution, and smaller floor space, and is highly valued gradually in different countries. There are compressed air energy storage power stations under construction in different developed countries, such as Germany, USA, Japan, and Italy, etc. In China, developing compressed air 25 energy storage and electric power generation techniques vigorously is of great strategic significance in economy, society, and national security aspects, and can promote rapid
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2017408795 01 Jul 2019 development of industries related with intelligent electric grid and major equipment manufacturing technology.
Compressed air energy storage refers to an energy storage solution in which electric power is used to compress air and the compressed air is sealed at a high pressure in a storage space 5 (e.g., an air storage tank or underground cavity) in the valley period of power grid load, and the compressed air is released to drive steam turbines to generate electric power in the peak period of power grid load.
The selection of large-scale compressed air storage spaces is one of the major problems that limit the development of compressed air energy storage. At present, the application of 0 compressed air energy storage is mainly centered on compressed air storage in underground salt cavities. For example, there are Huntorf compressed air energy storage power station in Germany and Mcintosh compressed air energy storage power station in USA. However, the distribution of salt rocks is very uneven, and the available spaces are limited in quantity in China. In contrast, China is a major coal mining country, and not only has a large quantity of 5 mines abandoned owing to resource depletion, but also has underground spaces in total volume of hundreds of millions of cubic meters formed annually in the coal mining process.
The vast underground spaces in abandoned mines can provide a new approach for the application of compressed air energy storage technology.
In China, there are about 150 cities with coal mines distributed around the country. Therefore, 20 utilizing abandoned coal mines to develop compressed air energy storage power stations can successfully meet the demand for consumption of renewable energy resources in the Three-North region and western region as well as the demand for peak shaving in the high-load eastern region. Especially, in the northern region in China, it is difficult to meet the natural hydrologic conditions required for constructing pumped storage power stations owing 25 to drought and water shortage. Therefore, waste mines with good geologic conditions may be selected to construct compressed air energy storage power stations.
At present, there are two methods of utilizing the excavated spaces in underground rock mass
11490116_1 (GHMatters) P109774.AU
2017408795 01 Jul 2019 for compressed air energy storage: one method is to store compressed air in salt rock caves, where compressed air can be stored at pressure as high as several MPa without treating the cave walls, thanks to the extremely low permeability of salt rocks; the other method is to store compressed air in rock tunnels or caves; however, in this method, the rock walls have to be 5 treated before compressed air can be stored, because the permeability of the rock mass is usually high, especially, the permeability of the rock mass in the superficial part of roadway is higher under the disturbance of excavation. The treatment method is to construct a concrete lining in the walls of the caves, apply an anti-seepage layer to the surface of the lining, and then directly store compressed air in the cavity after the treatment. However, such a treatment 0 method has the following drawbacks: it is difficult to maintain the integrality of the lining in a long term; the compressed air may easily leak to the peripheral rock mass through the surface of the lining and consequently the energy of the stored air may be reduced; besides, in the case of air leakage, it is difficult to locate the specific leakage position, causing difficulties to operation and maintenance.
At present, three relevant Chinese patent applications are found. The first patent is Chinese Patent Application No. CN200810033803.1, titled as Method of Utilizing Mines for Compressed Air Energy Storage, which discloses a method of utilizing mines for compressed air energy storage; specifically, an air bag made of an air-tight material is placed in a mine, the air bag has the same shape as the inner walls of the mine, and thereby is correspondingly 20 fixed in the inner walls of the mine.
The second patent application is Chinese Patent Application No. CN200810033801.2, titled as Method of Utilizing Hydraulic Pressure Produced in Mine for Compressed Air Energy Storage, which provides a method of utilizing the hydraulic pressure produced in a mine for compressed air energy storage; specifically, first, the mine is treated by waterproofing 25 treatment and filled with water, so that hydraulic pressure is generated against the bottom of the mine after the mine is filled with water; then, an air bag made of a waterproof and air-tight material is placed in the water in the bottom part of the mine for air storage.
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2017408795 01 Jul 2019
The third patent application is Chinese Patent Application No. CN200810033800.8, titled as Method of Utilizing Artificial Hydraulic Pressure in Cave for Compressed Air Energy Storage, which provides a method of utilizing artificial hydraulic pressure in a cave for compressed air energy storage; specifically, first, a waterproof bag made of waterproof material is placed on the inner walls of the cave and filled with water; then an air bag made of waterproof and air-tight material is placed in the water, and air is compressed and fed into the air bag through an air pipeline, to attain the purpose of energy storage; when energy is required, the compressed air in the air bag may be squeezed out under the hydraulic pressure in the cave to release energy.
Though the above-mentioned three patent applications are related with compressed air storage in underground chambers, all of them are inapplicable to downhole roadways in coal mines, and the reasons are as follows: (1) downhole roadways in coal mines have different types of shapes, such as rectangular shape or horseshoe shape, etc., and have rough and uneven surfaces; consequently, a flexible air storage bag may be deformed non-uniformly and damaged after it is placed in such a roadway; (2) since a large quantity of downhole gobs exist in a coal mine and the permeability of rock mass is relatively high, it is difficult to retain water in the downhole spaces for a long time, because the water may leak easily; (3) a loose zone exists within a certain scope in the surrounding rock of roadway under the effect of excavation disturbance and rock mass rheology, the strength of rock mass (especially tensile 20 strength) within the scope is lower, but the air pressure required for compressed air energy storage may be as high as lOMPa; consequently, under the long-term effect of the working pressure, the surrounding rock mass of roadway may be damaged easily, and the stability of the entire energy storage system may be affected. In summary, existing patents are inapplicable to the compressed air energy storage engineering in downhole roadways in coal 25 mines.
Summary of the Invention
In view of the drawbacks in the method for compressed air energy storage in rock tunnels or
11490116_1 (GHMatters) P109774.AU
2017408795 01 Jul 2019 caves in the prior art, embodiments of the present invention attempt to provide a method of utilizing a downhole roadway in a coal mine for compressed air energy storage, which solves the problems of high gas leakage risk and difficult ongoing maintenance in the existing methods.
In one aspect the present invention provides a method of utilizing a downhole roadway in a coal mine for compressed air energy storage, comprising the following steps:
Step 1: reinforcing a loose zone of surrounding rock of the roadway by high-pressure grouting;
Step 2: constructing a reinforced concrete lining with a circular cross section in the roadway, wherein, the size of the circular cross section is determined with the following method: drawing a circle with maximum area that is tangent to at least two edges of the cross sectional shape of the roadway; the position of the circle is determined with the following method: the bottom part of the circle is tangent to the floor of the cross section of the roadway, and the center of the circle is in a vertical bisecting line of the cross section of the roadway;
Step 3: grouting filling a clearance space between the original cross section of the roadway and the reinforced concrete lining;
Step 4: smoothening the inner surface of the reinforced concrete lining, and then bonding rubber or steel lining to the inner surface;
Step 5: sealing the two end faces of the roadway, wherein, the sealing structure comprises an inner steel barrier and an outer concrete barrier; arranging an air inflow pipeline, an air outflow pipeline, and a staff/equipment passageway at one end or two ends of the sealing structure;
Step 6: placing a flexible air storage bag made of butyl rubber or a high-polymer elastic material in the roadway, and connecting the air inflow pipeline and the air outflow pipeline.
Furthermore, in the step 1, the loose zone of surrounding rock of the roadway is ascertained by field testing with a borehole acoustic detection method.
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2017408795 01 Jul 2019
Furthermore, the clearance between the inner steel barrier and the outer concrete barrier is sealed with a sealant.
Benefits: compared with the prior art, the present invention attains the following beneficial effects:
(1) Since there are two air-sealing layers in the present invention, i.e., the flexible air storage bag and the anti-seepage layer on the surface of reinforced concrete lining, the overall reliability is greatly improved;
(2) In the present invention, the ongoing maintenance is convenient and easy; specifically, any leaking air storage bag may be replaced quickly to ensure continued operation of the system;
(3) The method in the present invention is highly adaptive to different geologic conditions;
specifically, even if there is any weak zone (e.g.,fault) on the periphery of the roadway, the method in the present invention can still be applied after the scope of high-pressure grouting reinforcement is enlarged appropriately; since there are two gas-sealing layers, the leak tightness of the entire air storage structure will not be affected by such a weak zone; in addition, damage of the air storage bag can be avoided effectively.
The method in the present invention has a clearly conceived scheme, easy to operate in the field, solves the problems of possible air leakage and difficult ongoing maintenance in the prior art, and has a good prospect of wide application.
Description of Drawings
Fig. 1 is a side view of the scheme of utilizing a downhole roadway in a coal mine for compressed air energy storage in an embodiment of the present invention;
Fig. 2 is a front view of the scheme of utilizing a downhole roadway in a coal mine for compressed air energy storage in an embodiment of the present invention;
In the figures: 1 - original rock area of roadway; 2 - grouted reinforcement area; 3 - grouted 25 filling area between original roadway and lining; 4 - reinforced concrete lining; 5 - rubber or
11490116_1 (GHMatters) P109774.AU
2017408795 01 Jul 2019 steel anti-seepage layer; 6 - steel barrier; 7 - concrete barrier; 8 - flexible air storage bag; 9 air inflow pipeline; 10 - air outflow pipeline; 11 - staff/equipment passageway
Embodiments
Hereunder an embodiment of the present invention will be further detailed with reference to the accompanying drawings.
As shown in Fig. 1, an embodiment of the method of utilizing a downhole roadway in a coal mine for compressed air energy storage comprises the following steps:
Step 1: first, testing the original rock area 1 of a roadway with a borehole acoustic inspection method to ascertain the scope of loose zone in the surrounding rock; then, reinforcing the 0 loose zone in the surrounding rock in the original rock area 1 of the roadway by high-pressure grouting, to form a grouted reinforcement area 2. The scope of grouting reinforcement may be slightly greater than the scope of the loose zone; as shown in Fig. 2, an annular grouted reinforcement area is formed.
Step 2: constructing a reinforced concrete lining with a circular cross section in the roadway, wherein, the size of the circular cross section is determined with the following method: drawing a circle with maximum area that is tangent to at least two edges of the cross sectional shape of the roadway; the position of the circle is determined with the following method: the bottom part of the circle is tangent to the floor of the cross section of the roadway, and the center of the circle is in a vertical bisecting line of the cross section of the roadway. In the 20 case that the cross section of the roadway is in a horseshoe shape, the reinforced concrete lining 4 is tangent to the two sides of the horseshoe-shaped cross section that are at the minimum distance from each other and tangent to the floor of the roadway, as shown in Fig. 2. In the case that the cross section of the roadway is a trapezoid or rectangular cross section, the size and position of the reinforced concrete lining 4 are determined according to the method 25 in this step.
Step 3: filling the clearance space between the original cross section of the roadway and the
11490116_1 (GHMatters) P109774.AU
2017408795 01 Jul 2019 reinforced concrete lining by grouting, the filing body should be compacted, to form a grouted filling area 3.
Step 4: smoothening the inner surface of the reinforced concrete lining 4, and then applying a rubber or steel liner 5 to attain two purposes: one purpose is to make the contact between the 5 flexible air storage bag and the inner surface of the reinforced concrete lining 5 more uniform, to prevent local large deformation of the flexible air storage bag incurred by defect of the reinforced concrete lining 4; the other purpose is to prevent the air from leaking to the peripheral rock mass in a case of air leakage from the air storage bag.
Step 5: sealing the two end faces of the roadway, wherein, the sealing structure comprises an 0 inner steel barrier 6 and an outer concrete barrier 7; sealing the clearance between the inner steel barrier 6 and the outer concrete barrier 7 with a sealant. In the construction, the steel barrier 6 is installed first, and then the reinforced concrete barrier 7 is constructed. Next, an air inflow pipeline 9, an air outflow pipeline 10, and a staff/equipment passageway 11 are arranged at one end or two ends of the sealing structure; preferably the staff/equipment 5 passageway 11 is arranged at a position on the barrier near the floor of the roadway.
Step 6: placing a flexible air storage bag 8 made of butyl rubber or a high-polymer elastic material in the roadway, and connecting the air inflow pipeline 9 and the air outflow pipeline 10.
The working principle of an embodiment of the present invention may be as follows: after air 20 flows into the flexible air storage bag 8, the flexible air storage bag 8 expands and comes into contact with the reinforced concrete lining 4 and the steel barriers 6 at the two ends; after the flexible air storage bag 8 fully contacts with the reinforced concrete lining 4 and the steel barriers 6, any additional air pressure will mainly be borne on the reinforced concrete lining 4 and transferred via the reinforced concrete lining 4 into the peripheral rock mass. In the 25 present invention, the strength and rigidity of the peripheral rock mass of the roadway are improved by grouting reinforcement, the stress can be transferred effectively via the filling body between the rock mass and the reinforced concrete lining, and the reinforced concrete
11490116_1 (GHMatters) P109774.AU
2017408795 01 Jul 2019 lining is supported strongly, to prevent excessive deformation and cracking of the reinforced concrete lining. With the method provided in the present invention, the flexible air storage bag and lining, which are weaker in the overall air storage structure, are protected effectively, to ensure long-term efficient operation of the system.
While the present invention is described above in some preferred embodiments, it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and those improvements and modifications should be deemed as falling in the scope of protection of the present invention.
Any discussion of the background art throughout this specification should in no way be 0 considered as an admission that such background art is prior art, nor that such background art is widely known or forms part of the common general knowledge in the field in Australia or worldwide.
In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word “comprise” and 5 variations such as “comprises” or “comprising” are used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features of the embodiments as disclosed herein

Claims (3)

1. A method of utilizing a downhole roadway in a coal mine for compressed air energy storage, comprising the following steps:
5 step 1: reinforcing a loose zone of surrounding rock of the roadway by high-pressure grouting;
step 2: constructing a reinforced concrete lining with a circular cross section in the roadway, wherein, the size of the circular cross section is determined with the following method: drawing a circle with maximum area that is tangent to at least two edges of the cross sectional 0 shape of the roadway; the position of the circle is determined with the following method: the bottom part of the circle is tangent to the floor of the cross section of the roadway, and the center of the circle is in a vertical bisecting line of the cross section of the roadway;
step 3: filling a clearance space between the original cross section of the roadway and the reinforced concrete lining by grouting;
5 step 4: smoothening the inner surface of the reinforced concrete lining, and then bonding rubber or steel lining to the inner surface;
step 5: sealing the two end faces of the roadway, wherein, the sealing structure comprises an inner steel barrier and an outer concrete barrier; arranging an air inflow pipeline, an air outflow pipeline, and a staff-/equipment passageway at one end or two ends of the sealing 20 structure; and step 6: placing a flexible air storage bag made of butyl rubber or a high-polymer elastic material in the roadway, and connecting the air inflow pipeline and the air outflow pipeline.
2. The method of utilizing a downhole roadway in a coal mine for compressed air energy storage according to claim 1, wherein, in the step 1, the loose zone of surrounding rock of the
25 roadway is ascertained by field testing with a borehole acoustic detection method.
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2017408795 01 Jul 2019
3. The method of utilizing a downhole roadway in a coal mine for compressed air energy storage according to claim 1 or 2, wherein, in the step 5, the clearance between the inner steel barrier and the outer concrete barrier is sealed with a sealant.
AU2017408795A 2017-10-25 2017-11-20 Method of utilizing downhole roadway in coal mine for compressed air energy storage Active AU2017408795B2 (en)

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CN2017110084238 2017-10-25
CN201711008423.8A CN109356650B (en) 2017-10-25 2017-10-25 Method for storing energy by utilizing compressed air in underground coal mine roadway
PCT/CN2017/111800 WO2019080219A1 (en) 2017-10-25 2017-11-20 Method for using coal mine underground tunnel for compressed air energy storage

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CN111257209B (en) * 2020-01-23 2021-11-19 中国矿业大学 Experimental device for simulating corrosion effect of saturated brine in waste salt cavern on top plate

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