Safe low-energy-consumption liquid oxygen pressurization output system

Abstract

The invention discloses a safe low-energy-consumption liquid oxygen pressurization output system, and belongs to the technical field of mineral resource exploitation. The system comprises a vertical Dewar tank, a liquid pressurization system, a horizontal Dewar tank, a liquid-gas separation device and a shunting pipeline system, the vertical Dewar tank is connected with an inlet of the horizontal Dewar tank through the liquid pressurization system, and an outlet of the horizontal Dewar tank is connected with the shunting pipeline system through the liquid-gas separation device. And a preset flow valve group is mounted on a shunting pipeline of the shunting pipeline system. The invention aims to solve the problems of improving the liquid oxygen conveying efficiency and safety, reducing the gasification loss, reducing the energy consumption and improving the rock breaking accuracy in the prior art, improve the liquid oxygen conveying safety, ensure the liquid oxygen rock cracking effect and reduce the rock cracking cost.

Description

Technical Field

[0001] The invention relates to a safe and low-energy consumption liquid oxygen pressurized output system, belonging to the technical field of mineral resource mining. Background Art

[0002] Gas energy rock breaking technology is a technology that uses gas energy to break rocks. It is widely used in mining and earthwork engineering. Common gas energy rock breaking methods include high-pressure gas rock breaking and liquid oxygen rock breaking. Among them, liquid oxygen rock breaking has become an important part of rock breaking technology due to its advantages such as high efficiency and environmental protection.

[0003] For liquid oxygen rock breaking, liquid oxygen is used as the working medium, and its feeding speed, stability and safety have an important impact on the rock breaking effect. The traditional liquid oxygen booster output system mainly transports liquid oxygen to the rock breaking point through a pressure vessel, but there are the following problems: 1. The output of cryogenic liquid oxygen in existing rock-breaking technology is directly output through the liquid outlet of the dewar tank, which has low pressure and long delivery pipeline, up to 100 meters at most. That is, long-distance delivery causes the liquid oxygen to be gasified in advance, so the amount of liquid oxygen delivered to the rock-breaking hole is very small, which seriously affects the rock-breaking effect and reduces the rock-breaking efficiency; 2. The existing low-temperature dewar tank pressurization technology uses a finned heat exchanger installed at the bottom of the dewar tank to increase the pressure inside the dewar tank. However, when the liquid level in the dewar tank is low, the pressurization speed is very slow. Secondly, when the liquid level in the dewar tank is low, the pressure boosting in the dewar tank does not work, and the remaining liquid oxygen in the tank cannot be used, resulting in serious waste of liquid oxygen and increasing the cost of rock breaking construction; 3. In the existing rock breaking technology, the amount of liquid oxygen delivered to the fracturing hole is not quantified and is based on the operator's experience and the instrument display of the dewar tank. Since the number displayed on the dewar tank instrument only represents the output of the liquid oxygen outlet of the dewar tank, that is, the total amount of pipeline gasification and input into the fracturing hole, but the amount of liquid oxygen input into the fracturing hole is not quantified, and the amount of liquid oxygen delivered to the fracturing hole cannot be accurately controlled, which affects the prediction and control of the rock breaking results; 4. Safety hazards in the process of liquid oxygen transportation, especially in complex mining environments, liquid oxygen leakage and increased gasification may lead to dangerous accidents, and the high energy consumption of liquid oxygen transportation and pressurization systems is not conducive to reducing mining costs.

[0004] Therefore, it is urgent to propose a safe and low-energy consumption liquid oxygen pressurization output system to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art of improving the efficiency and safety of liquid oxygen transportation, reducing gasification losses, reducing energy consumption and improving rock breaking accuracy. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention: A safe and low-energy consumption liquid oxygen pressurized output system comprises a vertical dewar tank, a liquid pressurizing system, a horizontal dewar tank, a liquid-gas separation device and a shunt pipeline system. The vertical dewar tank is connected to the inlet of the horizontal dewar tank through the liquid pressurizing system, and the outlet of the horizontal dewar tank is connected to the shunt pipeline system through the liquid-gas separation device. A preset flow valve group is installed on the shunt pipeline of the shunt pipeline system. The liquid oxygen stored in the vertical dewar tank is pressurized by the liquid pressurizing system and then enters the horizontal dewar tank. The flow rate is controlled in the horizontal dewar tank. Then, after liquid-gas separation is performed by the liquid-gas separation device, the pure liquid liquid oxygen at the separation point flows to the shunt pipeline system and is finally transported to the crack-causing hole.

[0007] Preferably, the liquid pressurization system comprises a liquid flow controller, a gas mass flow controller and a vaporizer, the inlet end of the vaporizer is connected to the vertical Dewar tank through the liquid flow controller, and the outlet end of the vaporizer is connected to the inlet end of the horizontal Dewar tank through the gas mass flow controller.

[0008] Preferably, a solenoid valve is provided at the outlet of the gas mass flow controller.

[0009] Preferably, the horizontal Dewar tank is provided with a return air pipe, and a low-pressure vent valve is installed on the return air pipe.

[0010] Preferably, a flow meter is provided between the liquid-gas separation device and the diversion pipeline system.

[0011] Preferably: the liquid-gas separation device comprises an outer shell, an inner shell, a deceleration baffle and a one-way safety valve, the inner shell is arranged inside the outer shell, and a vacuum insulation layer is formed between the two, a liquid inlet and a liquid discharge port connected to the inner shell are respectively arranged on both sides of the outer shell, a deceleration baffle is slidably arranged in the inner shell, an exhaust port connected to the inner shell is arranged on the outer shell between the deceleration baffle and the liquid inlet, and a one-way safety valve is arranged on the exhaust port.

[0012] The present invention has the following beneficial effects: 1. The present invention improves the transportation safety of liquid oxygen, ensures the rock cracking effect of liquid oxygen, and reduces the rock cracking cost; 2. The liquid-gas separation device of the present invention ensures that the oxygen output to the fracturing hole is pure liquid oxygen, which not only reduces the possibility of liquid oxygen vaporization in the fracturing hole, but also reduces the complexity of on-site operation, reduces the difficulty of operation and safety risks, improves the safety of operation, and at the same time can increase the amount of liquid oxygen input into the fracturing hole to ensure the rock breaking effect; 3. The liquid pressurizing system of the present invention can accurately control the liquid oxygen output pressure of the dewar tank, and ensure that the residual liquid oxygen in the dewar tank can be fully utilized while ensuring the efficiency of rapid liquid oxygen output, thereby reducing liquid oxygen damage and improving liquid oxygen utilization; 4. The present invention uses a liquid boosting device in conjunction with a liquid oxygen flow rate control device to not only quickly and stably provide the necessary liquid oxygen boosting, but also increase the delivery speed, reduce the gasification of liquid oxygen in the pipeline, reduce energy consumption, and at the same time ensure the consistency and stability of liquid oxygen required for rock breaking, thereby improving the efficiency and effect of gas energy rock breaking; 5. The flow diversion pipeline system of the present invention can accurately control the amount of liquid oxygen required for each group of fracture holes, realize accurate oxygen supply, optimize resource allocation, effectively avoid the waste of liquid oxygen, improve the overall utilization rate of liquid oxygen in gas energy rock breaking, and thus reduce the overall cost of rock breaking mining; 6. The design of the present invention takes safety and economy into consideration, fundamentally solves the problems existing in traditional gas-energy rock breaking, and combines quantitative management methods to make the operation more humane and enhance the controllability of the rock breaking process, providing a new working method and idea for the development of the field of gas-energy rock breaking. It not only realizes the efficient delivery and use of liquid oxygen in the process of gas-energy rock breaking, but also greatly improves the safety and economy of the operation, providing strong support for the advancement of gas-energy rock breaking technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a safe and low-energy consumption liquid oxygen pressurized output system; Figure 2 It is a structural schematic diagram of a liquid pressurization system; Figure 3 It is a structural schematic diagram of the liquid-gas separation device.

[0014] In the figure: 1-vertical Dewar tank, 2-liquid booster system, 3-horizontal Dewar tank, 4-liquid-gas separation device, 5-diversion pipeline system, 6-preset flow valve group, 7-flow meter, 21-liquid flow controller, 22-gas mass flow controller, 23-gasifier, 24-solenoid valve, 31-return air pipe, 32-low-pressure vent valve, 41-outer shell, 42-inner shell, 43-slow baffle, 44-one-way safety valve, 45-vacuum insulation layer, 46-liquid inlet, 47-drain port, 48-exhaust port. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0016] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: a fixed connection is selected as a welding connection, and a detachable connection is selected as a hinge connection.

[0017] Specific implementation method 1: Combination Figure 1-Figure 3 The present embodiment is described. A safe and low-energy consumption liquid oxygen boost output system of the present embodiment comprises a vertical dewar tank 1, a liquid boost system 2, a horizontal dewar tank 3, a liquid-gas separation device 4 and a shunt pipeline system 5. The vertical dewar tank 1 is connected to the inlet of the horizontal dewar tank 3 through the liquid boost system 2, and the outlet of the horizontal dewar tank 3 is connected to the shunt pipeline system 5 through the liquid-gas separation device 4. A preset flow valve group 6 is installed on the shunt pipeline of the shunt pipeline system 5 to quantify the amount of liquid oxygen in the fracture hole by digital display, so as to realize the separate liquid supply to the fracture hole and improve the utilization rate of liquid oxygen. The liquid oxygen stored in the vertical dewar tank 1 is pressurized by the liquid boosting system 2 and then enters the horizontal dewar tank 3. The flow rate is controlled in the horizontal dewar tank 3. Then, the liquid-gas separation is performed by the liquid-gas separation device 4. The pure liquid liquid oxygen at the separation point flows to the diversion pipeline system 5 and is finally transported to the crack-causing hole.

[0018] The liquid pressurizing system 2 comprises a liquid flow controller 21, a gas mass flow controller 22 and a vaporizer 23. The inlet end of the vaporizer 23 is connected to the vertical Dewar tank 1 through the liquid flow controller 21, and the outlet end of the vaporizer 23 is connected to the inlet of the horizontal Dewar tank 3 through the gas mass flow controller 22. The liquid pressurizing system 2 is used to centrally pressurize the liquid oxygen inside the vertical Dewar tank 1, and detect and control the flow rate and pressure of liquid conversion into gas through the liquid flow controller 21 and the gas mass flow controller 22, so as to achieve the liquid oxygen output pressurization effect, and ensure that the liquid oxygen is quickly and stably output from the liquid outlet of the vertical Dewar tank 1, wherein the liquid flow controller 21 is used to control the liquid source flow rate, the gas mass flow controller 22 is used to control the carrier gas flow rate, and the vaporizer 23 is a temperature-adjustable vaporizer for liquid vaporization, and also includes an optional flow temperature display controller, which controls the liquid flow controller 21, the gas mass flow controller 22 and the vaporizer 23 respectively, and is used to set the flow rate and temperature.

[0019] A regulating valve is provided between the liquid pressurizing system 2 and the horizontal dewar tank 3 to adjust the flow rate of the liquid oxygen outlet.

[0020] The outlet of the gas mass flow controller 22 is provided with a solenoid valve 24 , which is a gas one-way valve and is used to set a gas flow switch.

[0021] The horizontal dewar tank 3 is provided with a return air pipe 31 , and a low-pressure vent valve 32 is installed on the return air pipe 31 .

[0022] A flow meter 7 is provided between the liquid-gas separation device 4 and the diversion pipeline system 5. The liquid-gas separation device 4 is used to ensure that the oxygen delivered to the fracture hole is in liquid state.

[0023] The liquid-gas separation device 4 includes an outer shell 41, an inner shell 42, a deceleration baffle 43 and a one-way safety valve 44. The inner shell 42 is arranged inside the outer shell 41, and a vacuum insulation layer 45 is formed between the two to ensure that the temperature of the liquid and gas entering the device is constant and reduce gasification. A liquid inlet 46 and a liquid discharge port 47 connected to the inner shell 42 are respectively arranged on both sides of the outer shell 41. A deceleration baffle 43 is slidably arranged in the inner shell 42. An exhaust port 48 connected to the inner shell 42 is arranged on the outer shell 41 between the deceleration baffle 43 and the liquid inlet 46. A one-way safety valve 44 is arranged on the exhaust port 48. A small hole is arranged on the deceleration baffle 43. The design of the deceleration baffle 43 is mainly a structure that can change the direction of the airflow, so that the speed of the gas is reduced when passing through the baffle, thereby promoting the sedimentation of droplets. This design can be achieved by increasing the path length of the gas flow and changing the flow direction; the design of the small holes on the slow-down baffle 43 can help disperse the airflow, further reduce the speed of the gas when it passes through, and provide more sedimentation opportunities for the droplets.

[0024] The liquid-gas separation device 4 is mainly designed by utilizing the different densities of the liquid and gaseous states of the same substance. The interaction force between liquid oxygen molecules is strong, so that the liquid oxygen molecules are relatively fixed in space and difficult to move. In contrast, the interaction force between gaseous oxygen molecules is weak, and the molecules can move freely in space, that is, inside the liquid-gas separation device 4, utilizing the difference in flow characteristics between liquid oxygen and gaseous oxygen, liquid oxygen has a relatively slow flow speed due to its high density and strong intermolecular force, while gaseous oxygen has a relatively fast flow speed due to its low density and weak intermolecular force. A slow-down baffle 43 is designed to discharge gaseous oxygen from the exhaust port 48, and store the liquid phase inside the inner shell 42. A drain port 47 is provided at the bottom, and the drain port 47 flows the liquid phase medium into the shunt pipeline system 5 through the pipe section, and then transports it to the crack-causing hole.

[0025] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safe and low energy consumption liquid oxygen boost output system, characterized by: The invention comprises a vertical dewar tank (1), a liquid pressurizing system (2), a horizontal dewar tank (3), a liquid-gas separation device (4) and a shunt pipeline system (5). The vertical dewar tank (1) is connected to the inlet of the horizontal dewar tank (3) through the liquid pressurizing system (2), and the outlet of the horizontal dewar tank (3) is connected to the shunt pipeline system (5) through the liquid-gas separation device (4). A preset flow valve group (6) is installed on the shunt pipeline of the shunt pipeline system (5). The liquid oxygen stored in the vertical dewar tank (1) is pressurized by the liquid pressurizing system (2) and then enters the horizontal dewar tank (3). The flow rate is controlled in the horizontal dewar tank (3). After liquid-gas separation is performed by the liquid-gas separation device (4), the pure liquid liquid oxygen at the separation point flows to the shunt pipeline system (5) and is finally transported to the crack-causing hole.

2. A safe and low-energy consumption liquid oxygen pressurized output system according to claim 1, characterized in that: The liquid pressurizing system (2) comprises a liquid flow controller (21), a gas mass flow controller (22) and a vaporizer (23); the inlet end of the vaporizer (23) is connected to the vertical Dewar tank (1) via the liquid flow controller (21), and the outlet end of the vaporizer (23) is connected to the inlet end of the horizontal Dewar tank (3) via the gas mass flow controller (22).

3. A safe and low-energy consumption liquid oxygen pressurized output system according to claim 2, characterized in that: A solenoid valve (24) is provided at the outlet of the gas mass flow controller (22).

4. A safe and low energy consumption liquid oxygen pressurized output system according to claim 3, characterized in that: The horizontal Dewar tank (3) is provided with a gas return pipe (31), and a low-pressure vent valve (32) is installed on the gas return pipe (31).

5. A safe and low energy consumption liquid oxygen pressurized output system according to claim 4, characterized in that: A flow meter (7) is provided between the liquid-gas separation device (4) and the flow diversion pipeline system (5).

6. A safe and low energy consumption liquid oxygen pressurized output system according to claim 5, characterized in that: The liquid-gas separation device (4) comprises an outer shell (41), an inner shell (42), a deceleration baffle (43) and a one-way safety valve (44); the inner shell (42) is arranged inside the outer shell (41), and a vacuum insulation layer (45) is formed between the inner shell (42); a liquid inlet (46) and a liquid outlet (47) communicating with the interior of the inner shell (42) are respectively arranged on both sides of the outer shell (41); a deceleration baffle (43) is slidably arranged inside the inner shell (42); an exhaust port (48) communicating with the interior of the inner shell (42) is arranged on the outer shell (41) between the deceleration baffle (43) and the liquid inlet (46); a one-way safety valve (44) is arranged on the exhaust port (48); and a small hole is arranged on the deceleration baffle (43).

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