Liquid oxygen phase change fracturing device using alcohol as ignition agent

Abstract

The embodiment of the utility model provides a liquid oxygen phase change fracturing device using alcohol as an ignition agent, and relates to the technical field of liquid oxygen phase change blasting, the liquid oxygen phase change fracturing device comprises a closed container filled with liquid oxygen, and the upper part of the closed container is at least provided with a first opening, a second opening and a third opening; the device comprises a first liquid filling pipe, a first input valve, a hydrogen peroxide storage box, a first output pipe and a first output valve, wherein a catalytic bed is arranged at the lower end of the first output pipe; the alcohol squeezing and pushing supply pipeline system comprises a second liquid filling pipe, a second input valve, an alcohol storage box, a second output pipe and a second output valve, the alcohol storage box, the second output pipe and the second output valve are located in the closed container, the lower end of the second liquid filling pipe is connected to the hydrogen peroxide storage box, and the second input valve is located on the second liquid filling pipe; the input end of the second output pipe is connected to the closed container; the combustion chamber is provided with a first input port, a second input port and an exhaust port, a first exhaust pipe is inserted into the exhaust hole, and the upper end of the first exhaust pipe penetrates out of the third open hole.

Description

Technical Field

[0001] The invention relates to the technical field of liquid oxygen phase change explosion, in particular to a liquid oxygen phase change fracturing device using alcohol as an ignition agent. Background Art

[0002] Liquid oxygen phase change rock breaking technology is a technology that uses the large amount of heat and high-pressure gas released by the phase change of liquid oxygen to blast rocks into countless rock blocks. Its principle is to spray liquid oxygen into the blasthole, so that it changes from liquid to gas in an instant, releasing a large amount of heat and gas, generating high-pressure and high-temperature shock waves, thereby breaking the rock. Compared with traditional blasting technology, liquid oxygen phase change rock breaking technology has the advantages of low noise, low vibration, and environmental protection, and can also more accurately control the crushing effect.

[0003] Before the liquid oxygen changes phase, it is usually necessary to provide sufficient heat for the liquid oxygen so that the internal temperature of the fracturing tube filled with liquid oxygen reaches a certain level, so that the liquid oxygen can absorb a large amount of heat, change phase instantly, and generate high-pressure gas to act on the blasthole, causing the rock to break.

[0004] At present, the heating part of the liquid oxygen phase change fracturing device generally includes heating methods such as fuel combustion, electric heating, heat pipes or heat exchangers.

[0005] Among them, the current devices that heat liquid oxygen by burning fuel generally use methane, hydrogen, propane, etc. due to structural limitations. However, these fuels will produce a large amount of waste gas and waste residue when burned, which will pollute the environment. Summary of the invention

[0006] In view of this, an embodiment of the present invention provides a liquid oxygen phase change fracturing device using alcohol as an ignition agent. Alcohol can be used as an ignition agent, thereby improving the environmental pollution problem during the combustion and fracturing process of the fracturing device.

[0007] In order to achieve the above-mentioned invention object, the following technical scheme is adopted:

[0008] A liquid oxygen phase change fracturing device using alcohol as an ignition agent, comprising:

[0009] A closed container, wherein the interior of the closed container is used to be filled with liquid oxygen, and the upper portion of the closed container is provided with at least a first opening, a second opening, and a third opening;

[0010] A hydrogen peroxide squeezing and pushing supply pipeline system, comprising: a first liquid filling pipe, a first input valve, a hydrogen peroxide storage tank, a first output pipe and a first output valve, wherein the hydrogen peroxide storage tank, the first output pipe and the first output valve are respectively located inside the closed container, the lower end of the first liquid filling pipe passes through the first opening into the closed container and is connected to the hydrogen peroxide storage tank, the first input valve is located on the first liquid filling pipe, the input end of the first output pipe is connected to the closed container, the first output valve is located on the first output pipe, and the lower end of the first output pipe is provided with a catalytic bed for chemically reacting with hydrogen peroxide to release heat;

[0011] The alcohol squeezing and pushing supply pipeline system comprises: a second liquid filling pipe, a second input valve, an alcohol storage tank, a second output pipe and a second output valve, wherein the alcohol storage tank, the second output pipe and the second output valve are respectively located inside the sealed container, the lower end of the second liquid filling pipe passes through the second opening into the sealed container and is connected to the hydrogen peroxide storage tank, the second input valve is located on the second liquid filling pipe, the input end of the second output pipe is connected to the sealed container, and the second output valve is located on the second output pipe; the first output valve and the second output valve are electric valves;

[0012] A combustion chamber, wherein a first input port, a second input port and an exhaust port are provided on the combustion chamber, wherein the first input port is connected to the lower end of the first output pipe, the second input port is connected to the lower end of the second output pipe, a first exhaust pipe is inserted in the exhaust hole, and the upper end of the first exhaust pipe passes through the third opening.

[0013] Optionally, a rotatable centrifugal nozzle is provided at the lower end of the second output pipe, a thread is provided on the inner wall of the second input port, the centrifugal nozzle is arranged in the combustion chamber and is connected to the second input port through threads.

[0014] Optionally, the catalytic bed includes a bed body, an interior of the bed body containing thermite and metal oxidant components, and an inlet and outlet are provided on the surface of the bed body.

[0015] Optionally, the first filling tube, the first output tube, the second filling tube, the second output tube, the hydrogen peroxide storage tank and the alcohol storage tank are respectively stainless steel double-layer hollow structures, and the interlayer of the double-layer hollow structure is filled with rock wool for insulation.

[0016] Optionally, the combustion chamber is a hollow structure made of ceramic, and a graphene layer is coated on the inner wall of the combustion chamber.

[0017] Optionally, the upper portion of the sealed container further includes: a fourth opening and a fifth opening, a liquid oxygen filling pipe is inserted into the fourth opening, the lower end of the liquid oxygen filling pipe is arranged inside the sealed container, and a second exhaust pipe is inserted into the fifth opening.

[0018] Optionally, the sealed container includes: a plastic bag with a single open end and a stainless steel cylinder, the open end of the plastic bag is connected to the lower end of the stainless steel cylinder, the upper part of the stainless steel cylinder is a sealing structure, and the first opening to the fifth opening are located on the surface of the sealing structure.

[0019] The liquid oxygen phase change fracturing device using alcohol as an igniter provided in an embodiment of the present invention improves the structure of the liquid oxygen phase change fracturing device and provides an alcohol squeezing and pushing supply pipeline system, including: a second liquid filling pipe, a second input valve, an alcohol storage tank, a second output pipe and a second output valve, wherein the alcohol storage tank, the second output pipe and the second output valve are respectively located inside the closed container, the lower end of the second liquid filling pipe passes through the second opening into the closed container and is connected to the hydrogen peroxide storage tank, the second input valve is located on the second liquid filling pipe, the input end of the second output pipe is connected to the closed container, and the second output valve is located on the second output pipe; and a hydrogen peroxide squeezing and pushing supply pipeline system is provided, the two cooperate with each other and form a complete technical solution with other structures, which can not only be applied to engineering blasting to achieve efficient rock breaking, but also can use alcohol as an igniter, thereby improving the environmental pollution problem in the combustion and fracturing process of the fracturing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of a liquid oxygen phase change fracturing device using alcohol as an ignition agent according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic structural diagram of an embodiment of a hydrogen peroxide squeezing and pushing supply pipeline system;

[0023] Figure 3 for Figure 1 A schematic structural diagram of an embodiment of an alcohol squeezing and pushing supply pipeline system;

[0024] Figure 4 for Figure 1 A schematic structural diagram of an embodiment of a combustion chamber. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] It should be clear that in order to more clearly illustrate the present invention, many technical details are described in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without some of the details. In addition, in order to highlight the main purpose of the present invention, some methods, means, parts and their applications well known to those skilled in the art are not described in detail, but this does not affect the implementation of the present invention. The embodiments described herein are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0027] See also Figures 1 to 4 As shown, the liquid oxygen phase change fracturing device using alcohol as an ignition agent provided in the embodiment of the present invention is suitable for excavation or mining projects such as mines, lanes, and tunnels. The device is mainly composed of the following parts:

[0028] The sealed container 100 is used for filling liquid oxygen, and at least three openings are provided on the upper portion of the sealed container 100, namely, a first opening, a second opening, and a third opening. In addition, a liquid oxygen filling hole can also be provided on the upper portion of the sealed container 100 to facilitate filling of liquid oxygen 101.

[0029] The hydrogen peroxide squeezing and pushing supply pipeline system 200 includes: a first liquid filling pipe 201, a first input valve 202, a hydrogen peroxide storage tank 203, a first output pipe 204 and a first output valve 205. The hydrogen peroxide storage tank 203, the first output pipe 204 and the first output valve 205 are located inside the closed container 100. The lower end of the first liquid filling pipe 201 passes through the first opening and enters the closed container 100, and is connected to the hydrogen peroxide storage tank 203. The first input valve 202 is located on the first liquid filling pipe 201, the input end of the first output pipe 204 is connected to the closed container 100, the first output valve 205 is located on the first output pipe 204, and the lower end of the first output pipe 204 is provided with a catalytic bed 206 for chemically reacting with hydrogen peroxide to release heat. The system can ensure that the delivery of hydrogen peroxide is accurate and controllable.

[0030] The alcohol squeeze supply pipeline system 300 includes: a second liquid filling pipe 301, a second input valve 302, an alcohol storage tank 303, a second output pipe 304 and a second output valve 305. The alcohol storage tank 303, the second output pipe 304 and the second output valve 305 are located inside the closed container 100. The lower end of the second liquid filling pipe 301 passes through the second opening into the closed container 100 and is connected to the alcohol storage tank 303. The second input valve 302 is located on the second liquid filling pipe 301, the input end of the second output pipe is connected to the closed container 100, and the second output valve 305 is located on the second output pipe 304. The first output pipe 204 and the second output pipe 304 are electric valves, which generally include a housing, an electric actuator and a valve core in the housing, and the electric actuator drives the valve core to move under the control of the upper computer to change the opening and closing degree of the valve port, thereby controlling the flow of the fluid. By using an electric valve, the output of alcohol and hydrogen peroxide can be accurately controlled. Preferably, the electric valve is a flow valve, so that the output flow of alcohol and hydrogen peroxide can be controlled to ensure that the reaction in the combustion chamber proceeds at a predetermined ratio and rate, thereby improving the safety and reaction efficiency of the equipment.

[0031] In some embodiments, the first output valve 205 and the second output valve 305 are electric stop valves and are remotely connected to an external electric control system for remotely controlling the opening and closing of the second output valve 305 and the second output valve 305 .

[0032] The combustion chamber 400 is provided with a first input port, a second input port and an exhaust port. The first input port is connected to the lower end of the first output pipe 204, the second input port is connected to the lower end of the second output pipe 304, a first exhaust pipe 401 is inserted in the exhaust hole, and the upper end of the first exhaust pipe 401 passes through the third opening. The combustion chamber is used to provide an effective mixing and combustion space for alcohol and hydrogen peroxide.

[0033] The liquid oxygen phase change fracturing device and rock breaking method using alcohol as an ignition agent provided in the embodiment of the present invention improve the structure of the liquid oxygen phase change fracturing device and set an alcohol squeezing and pushing supply pipeline system, including: a second liquid filling pipe 301, a second input valve 302, an alcohol storage tank 303, a second output pipe 304 and a second output valve 305, wherein the alcohol storage tank 303, the second output pipe 304 and the second output valve 305 are respectively located inside the closed container 100, and the lower end of the second liquid filling pipe 301 passes through the second opening and enters the closed container 100. , and connected to the hydrogen peroxide storage tank, the second input valve 302 is located on the second liquid filling pipe 301, the input end of the second output pipe 304 is connected to the closed container 100, and the second output valve 305 is located on the second output pipe 304; and a hydrogen peroxide squeezing and pushing supply pipeline system is set, the two cooperate with each other and form a complete technical solution with other structures, which can not only be applied to engineering blasting to achieve efficient rock breaking, but also can use alcohol as an ignition agent, thereby improving the environmental pollution problem in the combustion and fracturing process of the fracturing device.

[0034] See also Figure 1 and Figure 4 As shown, in some embodiments, a rotatable centrifugal nozzle 306 is provided at the lower end of the second output pipe 304, a thread is provided on the inner wall of the second input port, and the centrifugal nozzle 306 is provided in the combustion chamber and connected to the second input port through a thread. In this way, by providing the centrifugal nozzle 306 to realize the atomization of alcohol, the mixing of the decomposition products of alcohol and hydrogen peroxide can be accelerated.

[0035] In some embodiments, the catalytic bed 206 includes a bed body, thermite and metal oxidant components located inside the bed body, and an inlet and outlet are provided on the surface of the bed body. Specifically, the catalytic bed is filled with granular manganese dioxide and a small amount of thermite, wherein the main function of manganese dioxide is to catalyze and decompose hydrogen peroxide, and the function of thermite is to release heat in contact with part of the hydrogen peroxide.

[0036] In some embodiments, the first liquid filling pipe 201, the first output pipe 204, the second liquid filling pipe 301, the second output pipe 304, the hydrogen peroxide storage tank 200 and the alcohol storage tank 300 can respectively adopt a stainless steel double-layer hollow structure, and the interlayer is filled with rock wool. Each pipe and the hydrogen peroxide storage tank are processed into a double-layer structure using stainless steel material. Since the stainless steel material itself has high temperature resistance and corrosion resistance, and can resist the decomposition of hydrogen peroxide to a certain extent, in this way, the hydrogen peroxide can be prevented from being decomposed prematurely in the pipeline during the transportation process.

[0037] In addition, by filling the interlayer with rock wool, which is a thermal insulation material with good thermal insulation and high temperature resistance, adding it to the interlayer can effectively isolate heat transfer and improve the thermal insulation effect, so that the entire pipeline system will not be greatly affected when surrounded by liquid oxygen inside the closed container 100.

[0038] The combustion chamber may be a hollow structure made of ceramic with a graphene layer coated on the inner wall.

[0039] The combustion chamber is made of high-temperature ceramics, which are resistant to high temperatures, corrosion, and have good thermal conductivity, and can withstand high-temperature and high-pressure combustion environments. A layer of graphene is added to the inner wall of the combustion chamber. Graphene has a high thermal conductivity and single-phase thermal conductivity, so that the heat inside the combustion chamber can be transferred to the outside of the combustion chamber more quickly, and the impact of the external environment on the inside of the combustion chamber can be reduced, so that the inside of the combustion chamber is kept in a stable state without being disturbed by the low-temperature environment of liquid oxygen, and the temperature outside the combustion chamber can be quickly raised to the temperature required for the phase change of liquid oxygen.

[0040] Furthermore, two holes are opened on the left and right sides of the combustion chamber, respectively used to fix the centrifugal nozzle 306 and the catalyst bed.

[0041] The upper portion of the sealed container 100 may further include a fourth opening and a fifth opening. A liquid oxygen filling pipe 102 is inserted into the fourth opening for filling liquid oxygen. A second exhaust pipe 103 is inserted into the fifth opening for discharging excess gas to ensure safety during the liquid oxygen filling process.

[0042] The sealed container includes: a plastic bag with a single open end and a stainless steel cylinder, the open end of the plastic bag is connected to the lower end of the stainless steel cylinder, the upper part of the stainless steel cylinder is a sealing structure, and the first opening to the fifth opening are located on the surface of the sealing structure.

[0043] The second liquid-filling tube 301 is connected to a high-pressure squeezing and pushing air source device 307 , and an output pipe of the high-pressure squeezing and pushing air source device 307 is in communication with the interior of the second liquid-filling tube 301 .

[0044] The liquid oxygen phase change fracturing device of the present invention can effectively use alcohol as an ignition agent, improve the environmental pollution problem in the combustion fracturing process of the fracturing device, and improve the fracturing efficiency and safety. In addition, the design of the device takes into account the convenience of operation and the simplicity of maintenance, making it more suitable for use in practical applications.

[0045] In order to help understand the technical solutions and technical effects provided by the embodiments of the present invention, the working process of a specific embodiment is now described in detail as follows:

[0046] After the above device is completed, it is sent into the blasthole, and an appropriate amount of high-concentration hydrogen peroxide is first injected into the hydrogen peroxide storage tank through the first liquid filling pipe 201. At this time, the first output valve is closed, and the first input valve 202 is opened. After the injection is completed, the first input valve 202 is closed. Then, an appropriate amount of alcohol is injected into the alcohol storage tank 303 through the second liquid filling pipe 301. At this time, the second output valve 305 is closed, and the second input valve 302 is opened. After the injection is completed, the second input valve 302 is closed, and then liquid oxygen is injected into the device through the liquid oxygen liquid filling pipe. After all liquids are injected, the first output valve is opened first through the remote control system. At this time, hydrogen peroxide flows downward through the first output pipe. When hydrogen peroxide flows through the catalyst bed, part of the hydrogen peroxide will contact the thermite in the catalyst bed, an exothermic reaction occurs, heat is released, the temperature around the catalyst bed rises, and the decomposition rate of hydrogen peroxide is accelerated. At the same time, hydrogen peroxide passes through the catalyst bed and is catalytically decomposed by the manganese dioxide therein, releasing heat and producing high-pressure gas oxygen.

[0047] Among them, hydrogen peroxide is selected with a concentration of 90%. It is known that 1 mol of hydrogen peroxide will release 98.2KJ of heat after being catalytically decomposed. A certain amount of hydrogen peroxide can make the average temperature inside the combustion chamber rise to 740°C after being catalytically decomposed. The high-temperature gas generated - oxygen will be released into the combustion chamber, and 2 mol of hydrogen peroxide will generate 1 mol of oxygen after being catalytically decomposed. After the first output valve is opened for a period of time, within about ten seconds, the second output valve 305 is opened through the remote control system, and the high-pressure gas generated by the high-pressure squeezing and pushing gas source device is used to push the alcohol in the alcohol storage tank 303 to flow downward, to prevent the alcohol from not flowing down due to the combustion chamber being full of oxygen. The alcohol is sprayed around the combustion chamber in the form of mist through the rotatable centrifugal nozzle 306 to accelerate the mixing of the alcohol in the combustion chamber.

[0048] Alcohol and oxygen will react with combustion at about 360°C. When hydrogen peroxide is catalytically decomposed, the heat generated causes the temperature inside the combustion chamber to reach this level. The alcohol spray comes into contact with oxygen and a combustion reaction occurs, releasing a large amount of heat and producing water and carbon dioxide.

[0049] The choice of alcohol concentration was also determined by the inventor through creative work, and a concentration of 70% alcohol was selected. It is known that when 1 mol of alcohol and 3 mol of oxygen are completely burned, 1367KJ of heat will be released, causing the temperature inside the combustion chamber to rise rapidly and be in a high temperature state. Therefore, hydrogen peroxide and alcohol are injected in a ratio of 6:1.

[0050] In this way, the first output valve 205 and the second output valve 305 are opened successively, so that the hydrogen peroxide is first catalytically decomposed to produce oxygen, and then contacts with the sprayed alcohol to generate combustion reaction and release heat. At this time, in the combustion chamber, the hydrogen peroxide is catalytically decomposed to produce high-pressure gas oxygen on one side, and on the other side, the oxygen contacts with the sprayed alcohol to generate combustion reaction. The two processes are carried out simultaneously and release heat, so that the temperature inside the combustion chamber rises very quickly and is transferred to the surrounding liquid oxygen, so that the temperature inside the device rises rapidly. Since the standard phase change heat of liquid oxygen is 6.82KJ / mol, it is found through experiments that: the selection of this parameter makes the heat released by the combustion reaction of alcohol completely cause the surrounding liquid oxygen to undergo phase change, expand the volume by more than 800 times, and generate high-pressure gas to act on the blasthole to break the rock.

[0051] Specifically, this embodiment also provides a working method of a liquid oxygen phase change fracturing device using alcohol as an ignition agent, comprising the following steps:

[0052] S10, place the liquid oxygen phase change fracturing device into the blasthole, open the first input valve 202, inject hydrogen peroxide of the first concentration into the first liquid filling pipe 201, and flow into the hydrogen peroxide storage tank 203 for temporary storage; at the same time, open the second input valve 302, inject alcohol of the second concentration into the second liquid filling pipe 301, and flow into the alcohol storage tank 303 for temporary storage; then, fill liquid oxygen into the sealed container 100. This step ensures the preparation of all reactants and provides a basis for subsequent fracturing reaction explosion.

[0053] S20: After all the above liquids are injected, the first output valve 205 is controlled to open, and the hydrogen peroxide flows downward from the storage tank 203 along the first output pipe 204. When it flows through the catalytic bed 206, it contacts the catalyst to react chemically, releases heat, accelerates the decomposition speed, generates high-temperature gas, and enters the combustion chamber 400. The high-temperature gas contains oxygen; the key to the design of the catalytic bed 206 is to optimize the decomposition of hydrogen peroxide and ensure efficient heat and gas generation.

[0054] S30. After a predetermined time, the second output valve 305 is controlled to open, and the alcohol flows downward from the storage box 303 along the second output pipe 304 and enters the combustion chamber 400 which has been filled with high-temperature oxygen. After the alcohol and the high-temperature oxygen come into contact, a combustion reaction occurs, generating a large amount of heat which diffuses around the combustion chamber 400.

[0055] S40. When the heat outside the combustion chamber 400 reaches the liquid oxygen vaporization temperature, the liquid oxygen inside the sealed container 100 undergoes a phase change and vaporizes. The volume of the sealed container 100 expands rapidly and explodes instantly. High-pressure gas is ejected from the sealed container 100 and impacts the blast hole, breaking the rock.

[0056] In the optional step of S20, when hydrogen peroxide flows through the catalyst bed 206, part of the hydrogen peroxide contacts the thermite in the catalyst bed, an exothermic reaction occurs, and the decomposition rate of hydrogen peroxide is accelerated; at the same time, hydrogen peroxide is catalytically decomposed by the manganese dioxide in the catalyst bed, releasing heat and generating high-pressure gas. In this way, the efficiency of the catalytic reaction and the generation of heat can be improved, ensuring that the interior of the combustion chamber 400 can quickly reach the required high temperature state.

[0057] In this embodiment, hydrogen peroxide flows through the catalytic bed and is decomposed by the catalyst therein, generating high-temperature gaseous oxygen and releasing a certain amount of heat: , 1 mol concentration is 90% After catalytic decomposition, 98.2KJ of heat will be released, causing the surrounding temperature to rise rapidly. A certain amount of hydrogen peroxide can cause the average surrounding temperature to rise to about 740°C after catalytic decomposition, which is enough to reach the temperature required for the combustion of alcohol and oxygen.

[0058] In the optional step of S30, after the alcohol flows downward from the storage box 303 along the second output pipe 304, the following steps are also included: using the high-pressure gas generated by the high-pressure squeezing and pushing gas source device to push the alcohol in the alcohol storage box 303 to flow downward to prevent the alcohol from being unable to flow down due to the combustion chamber 400 being filled with oxygen; the alcohol is sprayed into the combustion chamber 400 in the form of a spray through the rotatable centrifugal nozzle 306; when the hydrogen peroxide is catalytically decomposed into high-pressure gas after passing through the catalytic bed 206, the heat generated causes the interior of the combustion chamber 400 to reach a predetermined temperature, and the alcohol spray The mist comes into contact with the oxygen in the high-pressure gas to produce a combustion reaction, releasing a large amount of heat and producing water and carbon dioxide; as the alcohol spray and oxygen are completely burned, the temperature inside the combustion chamber 400 rises rapidly and is in a high temperature state; at this time, the remaining hydrogen peroxide in the combustion chamber 400 is catalytically decomposed to produce high-pressure gas, and at the same time, the oxygen in the high-pressure gas comes into contact with the injected alcohol spray to produce a combustion reaction. The two processes proceed simultaneously and release heat, causing the internal temperature of the combustion chamber 400 to rise sharply, and is transferred to the surrounding liquid oxygen, causing the internal temperature of the closed container 100 to rise rapidly.

[0059] In some embodiments, the ratio of hydrogen peroxide to alcohol is 6:1, and the alcohol concentration used is 70%. The selection of this ratio and concentration is based on the best efficiency obtained through experiments and calculations. It is known that alcohol and oxygen will undergo a combustion reaction at about 360°C. When hydrogen peroxide is catalytically decomposed, the heat generated causes the interior of the combustion chamber to reach this temperature, and the alcohol spray and oxygen come into contact to undergo a combustion reaction, releasing a large amount of heat and producing water and carbon dioxide. Here, a concentration of 70% alcohol is selected. It is known that when 1 mol of alcohol and 3 mol of oxygen are completely burned, 1367KJ of heat will be released, causing the temperature inside the combustion chamber to rise rapidly and be in a high temperature state. Therefore, hydrogen peroxide and alcohol are injected at a ratio of 6:1. Since the standard phase change heat of liquid oxygen is 6.82KJ / mol, under this parameter, the heat released by the combustion reaction of alcohol can completely cause the surrounding liquid oxygen to undergo a phase change, expand the volume by more than 800 times, and generate high-pressure gas to act on the blasthole, so that the rock is efficiently broken to ensure the maximum heat output of the combustion reaction and the optimal fracturing effect.

[0060] Among them, alcohol and oxygen will undergo a combustion reaction when they come into contact at around 365°C. The reaction will release a large amount of heat and produce water and carbon dioxide: , 1 mol concentration is 70% When completely burned, 1367KJ of heat will be released.

[0061] From the two reaction equations of hydrogen peroxide and alcohol and oxygen mentioned above, it can be seen that hydrogen peroxide and alcohol are injected into the container in a ratio of 6:1. The hydrogen peroxide is first catalytically decomposed, and the high-temperature gas oxygen produced then contacts the alcohol to undergo a combustion reaction to release heat, which is sufficient to provide sufficient heat for the phase change of the surrounding liquid oxygen.

[0062] The liquid oxygen phase change fracturing device and rock breaking method using alcohol as an ignition agent provided by the embodiment of the present invention use alcohol and hydrogen peroxide as ignition agents, first catalytically decompose hydrogen peroxide to produce high-temperature gaseous oxygen, then use the combustion reaction of alcohol and oxygen to provide heat for the liquid oxygen phase change, and use the explosive impact force generated at the moment of liquid oxygen phase change gasification to achieve rock crushing. During the filling process, since alcohol is a relatively safe fuel that is not easy to explode, and the combustion products are water and carbon dioxide, it will not cause pollution to the environment during the fracturing process. Compared with other fuels, alcohol is safer; secondly, alcohol is a common chemical with relatively low cost and easier to obtain; finally, alcohol is a flammable liquid that can burn in the air and generate a large amount of heat and water vapor. The heat generated by it can completely make liquid oxygen undergo a phase change to achieve rock crushing.

[0063] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A liquid oxygen phase change fracturing device using alcohol as an ignition agent, characterized in that: include: A closed container, wherein the interior of the closed container is used to be filled with liquid oxygen, and the upper portion of the closed container is provided with at least a first opening, a second opening, and a third opening; A hydrogen peroxide squeezing and pushing supply pipeline system, comprising: a first liquid filling pipe, a first input valve, a hydrogen peroxide storage tank, a first output pipe and a first output valve, wherein the hydrogen peroxide storage tank, the first output pipe and the first output valve are respectively located inside the closed container, the lower end of the first liquid filling pipe passes through the first opening into the closed container and is connected to the hydrogen peroxide storage tank, the first input valve is located on the first liquid filling pipe, the input end of the first output pipe is connected to the closed container, the first output valve is located on the first output pipe, the lower end of the first output pipe is provided with a catalytic bed for chemically reacting with hydrogen peroxide to release heat, and the first output valve is an electric valve; An alcohol squeezing and pushing supply pipeline system, comprising: a second liquid filling pipe, a second input valve, an alcohol storage tank, a second output pipe and a second output valve, wherein the alcohol storage tank, the second output pipe and the second output valve are respectively located inside the sealed container, the lower end of the second liquid filling pipe passes through the second opening into the sealed container and is connected to the hydrogen peroxide storage tank, the second input valve is located on the second liquid filling pipe, the input end of the second output pipe is connected to the sealed container, the second output valve is located on the second output pipe, and the second output valve is an electric valve; A combustion chamber, wherein a first input port, a second input port and an exhaust port are provided on the combustion chamber, wherein the first input port is connected to the lower end of the first output pipe, the second input port is connected to the lower end of the second output pipe, a first exhaust pipe is inserted in the exhaust port, and the upper end of the first exhaust pipe passes through the third opening.

2. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 1 is characterized in that: A rotatable centrifugal nozzle is provided at the lower end of the second output pipe, a thread is provided on the inner wall of the second input port, the centrifugal nozzle is arranged in the combustion chamber and is connected to the second input port through threads.

3. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 1, characterized in that: The catalytic bed comprises a bed body, the interior of the bed body contains thermite and metal oxidant components, and the surface of the bed body is provided with an inlet and an outlet.

4. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 1 is characterized in that: The first liquid filling pipe, the first output pipe, the second liquid filling pipe, the second output pipe, the hydrogen peroxide storage tank and the alcohol storage tank are respectively stainless steel double-layer hollow structures, and the interlayer of the double-layer hollow structure is filled with rock wool for thermal insulation.

5. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 1, characterized in that: The combustion chamber is a hollow structure made of ceramics, and a graphene layer is coated on the inner wall of the combustion chamber.

6. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 1, characterized in that: The upper part of the sealed container also includes: a fourth opening and a fifth opening, a liquid oxygen filling pipe is inserted into the fourth opening, the lower end of the liquid oxygen filling pipe is arranged inside the sealed container, and a second exhaust pipe is inserted into the fifth opening.

7. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 6 is characterized in that: The sealed container includes: a plastic bag with a single open end and a stainless steel cylinder, the open end of the plastic bag is connected to the lower end of the stainless steel cylinder, the upper part of the stainless steel cylinder is a sealing structure, and the first opening to the fifth opening are located on the surface of the sealing structure.

8. The liquid oxygen phase change fracturing device using alcohol as an ignition agent according to claim 1, characterized in that: The second liquid-filling tube is connected to a high-pressure squeezing and pushing air source device, and an output pipe of the high-pressure squeezing and pushing air source device is in communication with the interior of the second liquid-filling tube.

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