A high-energy electrohydraulic detonation method of composite power modulation

Abstract

This invention discloses a high-energy hydroelectric detonation method using composite power pulse modulation, mainly comprising composite power modulation, load energy modulation, shock wave waveform modulation, and shock wave loading modulation. In composite power modulation, a composite power pulse is formed by superimposing a high-amplitude short-pulse pulse with a low-amplitude long-pulse pulse. In load energy modulation, a rapid phase transition of the metal wire is achieved through the high-amplitude component of the composite power pulse, and the plasma channel is maintained through the long-pulse component, igniting the metal powder to release energy. In shock wave waveform modulation, a high-amplitude shock wave is generated during the rapid phase transition stage of the metal wire, and a large-impulse shock wave is generated during the plasma channel expansion stage and the metal powder combustion stage; these two components are superimposed to regulate the shock wave waveform. In shock wave loading modulation, the intensity of the composite shock wave is adjusted according to measured rock parameters; the high-amplitude component is used to induce rock fracturing and reduce rock strength, while the large-impulse component is used to expand the fracturing range, achieving controllable rock fracturing.

Description

Technical Field

[0001] This invention belongs to the field of pulse power methods, and more specifically, relates to a high-energy liquid-electric detonation method with composite power modulation. Background Technology

[0002] High-energy liquid-electric detonation technology is an electromagnetic equipment based on pulsed power technology. It converts electrical energy into heat, light radiation, and shock waves by forming an electric arc through the breakdown of a liquid medium. The electric arc generated by the electromagnetic equipment with high system energy storage can produce shock waves comparable to explosives, and has advantages such as safety, controllability, energy saving, and environmental protection.

[0003] The intensity and impulse of the shock wave generated by high-energy electrohydraulic detonation technology depend on the amplitude and pulse width of the system's output pulse power. To ensure the shock wave amplitude, a power supply system with small capacitance and high voltage is often used to generate high-power peak pulses, thereby increasing the shock wave amplitude. However, this power supply system has low energy storage, resulting in short shock wave duration and low impulse, requiring multiple loading cycles to achieve rock breaking, thus increasing rock breaking time and energy consumption. Furthermore, existing systems generate only a single type of shock wave, failing to precisely generate shock waves according to rock breaking requirements, thus hindering controllable electrohydraulic blasting of rocks.

[0004] Therefore, it is necessary to develop a high-energy liquid-electric detonation method with composite power modulation to simultaneously take into account both shock wave amplitude and shock wave impulse. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a high-energy hydraulic detonation method with composite power modulation. This method combines high-amplitude short-pulse pulses with low-amplitude long-pulse pulses into a composite pulse, igniting a load formed by a metal wire-metal powder combination to generate a shock wave with controllable amplitude and impulse. The high-amplitude component of the shock wave is used to fracturing and weaken the rock, while the large-impulse component expands the effective range, achieving large-volume rock fragmentation. This improves the system's rock-breaking efficiency, reduces its energy consumption, meets various application conditions, and enhances system controllability.

[0006] To achieve the above objectives, this invention proposes a high-energy hydroelectric detonation method with composite power modulation, applied when pulsed power acts on a load to generate a shock wave. The load is formed by a combination of metal wire and metal powder, and includes composite power modulation, load energy modulation, shock wave waveform modulation, and shock wave loading modulation.

[0007] In composite power modulation, a high-amplitude short-pulse-width pulse is superimposed with a low-amplitude long-pulse-width pulse to form a composite power pulse;

[0008] In load energy modulation, rapid energy deposition in the phase transition stage of the metal wire is achieved by using the high-amplitude short-pulse-width pulse component in the composite power pulse, and the plasma channel is maintained by using the low-amplitude long-pulse-width pulse component, thereby improving the energy deposition in the plasma channel stage and enabling the metal powder to ignite and release energy.

[0009] In shock wave waveform modulation, a high-amplitude shock wave is generated during the rapid phase transition stage of the metal wire, and a large-impulse shock wave is generated during the expansion stage of the plasma channel and the combustion stage of the metal powder. The high-amplitude shock wave component and the large-impulse shock wave component chase and superimpose to form a composite shock wave. The composite shock wave waveform can be adjusted by adjusting the high-amplitude shock wave component and the large-impulse shock wave component.

[0010] In shock wave loading modulation, high amplitude components are used to induce fracturing in the blasted object, reducing its strength, while large impulse components are used to expand the fracturing range, thus achieving controllable fracturing of the blasted object.

[0011] Furthermore, in composite power modulation, the high-amplitude short-pulse-width pulse component precedes the low-amplitude long-pulse-width pulse component in timing. The timing of both can be adjusted according to application needs. The low-amplitude long-pulse-width pulse component can be synthesized from multiple pulses, and the timing of each pulse can be arbitrarily adjusted. By adjusting the timing, composite power pulses of arbitrary waveforms can be generated.

[0012] Furthermore, when the composite power pulse is applied to the load formed by the metal wire-metal powder combination, the metal wire rapidly deposits electrical energy during the phase transition process under the action of the high-amplitude, short-pulse-width pulse component. Through melting and vaporization processes, melting shock waves and vaporization shock waves are generated respectively. The vaporization shock wave chases the melting shock wave, and the two superimpose to form a high-amplitude shock wave. The high-amplitude shock wave can be adjusted by regulating the high-amplitude, short-pulse-width pulse component in the composite power pulse and the metal wire parameters. The phase transition process refers to the process by which the metal wire changes from a solid state to a liquid state and finally to a gaseous state under the action of the composite power pulse. After the phase transition process is completed, the metal wire vapor breaks down, forming an initial plasma channel.

[0013] Furthermore, after the initial plasma channel is formed, electrical energy is continuously deposited under the action of the low-amplitude long-pulse-width pulse component, the internal energy of the channel increases, expands outward, generates a plasma channel shock wave, and continuously generates light radiation and thermal radiation, igniting the metal powder. The metal powder reacts with the liquid medium, releasing a large amount of energy and gas, generating a combustion shock wave. The combustion shock wave chases the plasma shock wave, forming a high-impulse shock wave. The high-impulse shock wave can be adjusted by regulating the low-amplitude long-pulse-width pulse component and the metal powder parameters.

[0014] Furthermore, in shock wave waveform modulation, a high-impulse shock wave chases a high-amplitude shock wave, and the two superimpose to form a high-amplitude, high-impulse shock wave. The generation time of the high-amplitude shock wave is synchronized with the high-amplitude, short-pulse-width pulse component. The high-amplitude shock wave is adjusted by regulating the high-amplitude, short-pulse-width pulse component and the metal wire parameters. The generation time of the high-impulse shock wave is synchronized with the low-amplitude, long-pulse-width pulse component. The impulse of the high-impulse shock wave is adjusted by regulating the low-amplitude, long-pulse-width pulse component and the metal powder parameters.

[0015] Furthermore, in shock wave loading modulation, the composite shock wave parameters are adjusted according to the measured parameters of the object being blasted to meet the fragmentation requirements of the object. The composite shock wave is loaded onto the object being blasted through the shock wave propagation medium, thereby suppressing shock wave attenuation during the process. The high-amplitude shock wave amplitude is higher than the tensile strength of the object being blasted, achieving fracturing of the object and reducing its strength, making the tensile strength of the object lower than the amplitude of the high-impulse shock wave. After the intensity of the high-impulse shock wave is reduced, the range of action of the composite shock wave is expanded, and the controlled fragmentation of the object is achieved.

[0016] Compared with the prior art, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0017] 1. This invention proposes a high-energy hydraulic detonation method with composite power modulation, which can generate controllable shock waves according to different application requirements. This invention proposes using a high-amplitude shock wave to fracture the object being blasted, reducing its strength; then using a subsequent high-impulse shock wave to expand the effective range and break the object; simultaneously, a low-amplitude high-impulse shock wave acts on the weakened object, thus extending the duration of the composite shock wave and avoiding energy loss due to the composite shock wave intensity being far higher than the tensile strength of the object being blasted, thereby improving energy utilization efficiency and reducing rock-breaking energy consumption.

[0018] 2. The composite shock wave proposed in this invention is flexibly adjustable. By controlling the shock wave amplitude and impulse, the fracturing and fragmentation range of the blasted object can be adjusted, thereby achieving directional and controllable electric blasting of the blasted object. In addition, the waveform of the synthesized pulse can be adjusted by adjusting the timing of multiple pulses.

[0019] 3. The load of the present invention is a structure composed of metal wire and metal powder. The metal powder is ignited by the electric explosion process of the metal wire, and the energy released by the metal powder is used as the energy supplement of the electric arc to increase the impulse of the shock wave. At the same time, compared with other compounds, metal powder has higher safety and is easy to obtain, transport and store. Attached Figure Description

[0020] Figure 1 A flowchart of a high-energy liquid-electric detonation method with composite power modulation;

[0021] Figure 2This is a schematic diagram of the composite power pulse acting on the load in a high-energy hydraulic detonation method with composite power modulation provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the composite power pulse in a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the load structure of a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of load energy deposition and composite shock wave generation in a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the composite shock wave and the fragmentation of the blasted object in a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] This invention proposes a high-energy hydraulic-electric detonation method with composite power modulation, applied when a pulsed power is applied to a load to generate a shock wave. The pulsed power is the composite power described in this invention. The load is a combination of metal wire and metal powder. By applying a composite power pulse to the load, high-energy hydraulic-electric detonation occurs, generating a shock wave for blasting the target object, such as fracturing rock.

[0028] Figure 1 This is a flowchart of a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention, as shown below. Figure 1As shown, it includes composite power modulation, load energy modulation, shock wave waveform modulation, and shock wave loading modulation. Specifically: In composite power modulation, a high-amplitude short-pulse-width pulse is superimposed with a low-amplitude long-pulse-width pulse to form a composite power pulse; In load energy modulation, the load is composed of a combination of metal wire and metal powder. The high-amplitude pulse component in the composite power pulse achieves rapid energy deposition during the phase transition stage of the metal wire, while the long-pulse-width pulse component maintains the plasma channel, improves energy deposition during the plasma channel stage, and ignites the metal powder to release energy; In shock wave waveform modulation, a high-amplitude shock wave is generated during the rapid phase transition stage of the metal wire, and a large-impulse shock wave is generated during the plasma channel expansion stage and the metal powder combustion stage. The impulse is adjusted by the superposition of the two shock wave components of the composite power pulse; In shock wave loading modulation, the adjusted shock wave interacts with the object being blasted. The high-amplitude component is used to induce fracturing in the object being blasted, reducing its strength, while the large-impulse component is used to expand the fragmentation range, achieving controllable fragmentation of the object being blasted.

[0029] Figure 2 This is a schematic diagram of the composite power pulse acting on the load in a high-energy hydroelectric detonation method with composite power modulation provided by an embodiment of the present invention. As shown in the figure, it illustrates the power supply topology for generating the composite power pulse, and the first pulse capacitor in the figure... C 1 is a pulse capacitor with a rated capacitance of 20μF and a charging voltage of 18kV; the first pulse inductor... L The inductance value is 5μH, when the first thyristor S When 1 is turned on, the first pulse capacitor C 1. Through the first pulse inductor L One pair of loads discharges, generating a high-power amplitude pulse. After the energy of the first pulse capacitor is fully released, the first diode... D 1. Enable freewheeling to avoid the first pulse capacitor. C A reverse voltage is generated at both ends. (See the second pulse capacitor in the diagram.) C 2 is a pulse capacitor with a rated capacitance of 9.47mF and a charging voltage of 4kV; the second pulse inductor... L The inductance value is 25μH, when the second thyristor S When 2 is turned on, the second pulse capacitor C 2. Through the second pulse inductor L Two loads discharge, forming a long pulse width. Once the capacitor's energy is fully released, the second diode... D 2. Conduct freewheeling to avoid second pulse capacitor. C 2. Back pressure is generated at both ends. Figure 2 The power waveform generated by the composite power pulse acting on the load is shown in Figure 3. Figure 3This is a schematic diagram of the composite power pulse of a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention. As can be seen from the figure, the high-amplitude pulse power amplitude is 1200MW and the pulse width is 25μs, while the long-pulse amplitude is 75MW and the pulse width is 1.5ms.

[0030] In fact, the schematic diagram of the composite power pulse acting on the load is also a circuit topology diagram of the high-energy hydroelectric detonation method of composite power modulation. Essentially, it generates a composite power pulse by coordinating the discharge of a small capacitor with high voltage and a large capacitor with high energy storage to the load. Specifically, in composite power modulation, the high-amplitude, short-pulse-width pulse component precedes the low-amplitude, long-pulse-width pulse component in timing, and their timing can be adjusted according to application requirements. The low-amplitude, long-pulse-width pulse component can be synthesized from multiple pulses, and the timing of each pulse is arbitrarily adjustable. Through timing adjustment, composite power pulses of arbitrary waveforms can be generated.

[0031] Figure 4 This is a schematic diagram of the load structure for a high-energy liquid-electric detonation method with composite power modulation provided in an embodiment of the present invention. As shown in the figure, the load structure consists of an outermost layer of encapsulation material 304, a middle layer of a spiral structure 302 made of wound metal wire, a central layer of metal powder 303, and brass caps 301 at both ends. Specifically, the metal wire is an aluminum wire with a diameter of 0.8 mm, wound into a spiral structure 302. The metal powder 303 is aluminum powder with a particle size of 0.1 mm and a filling mass of 2 g. The encapsulation material 304 is made of polyethylene, and the brass caps 301 at both ends encapsulate the metal wire and metal powder, ensuring good contact with the discharge electrode.

[0032] Figure 5 This diagram illustrates the load energy deposition and composite shock wave generation of a high-energy liquid-electric detonation method with composite power modulation provided in this invention. As shown, a composite power pulse is applied to a metal wire-metal powder composite load. Under the influence of a high-amplitude, short-pulse-width pulse component, the metal wire rapidly deposits electrical energy during the phase transition. Through melting and vaporization processes, melting shock waves and vaporization shock waves are generated respectively. The vaporization shock wave chases the melting shock wave, and the two superimpose to form a high-amplitude shock wave. The high-amplitude shock wave is adjusted by coordinating the high-amplitude, short-pulse-width pulse component in the composite power pulse with the metal wire parameters. Specifically, the energy deposited by the high-amplitude pulse component during the phase transition stage of the composite power pulse should be higher than the energy required for the vaporization of the metal wire. The pulse width and amplitude of the composite power pulse component can be adjusted according to the metal wire mass and superheat coefficient requirements. After the phase transition process, the metal wire vapor breaks down, forming an initial plasma channel.

[0033] Subsequently, under the influence of a low-amplitude, long-pulse component, the initial plasma channel continuously deposits electrical energy, increasing its internal energy and expanding outwards to generate a plasma channel shock wave. This shock wave also continuously produces light and heat radiation, igniting the metal powder. The metal powder reacts with the liquid medium, releasing a large amount of energy and gas, generating a combustion shock wave. This combustion shock wave chases the plasma shock wave, forming a high-impulse shock wave. The high-impulse shock wave is adjusted by coordinating the long-pulse component of the composite power pulse with the metal powder parameters. The liquid medium is positioned such that the metal wire-metal powder composite load is placed within the liquid medium.

[0034] Furthermore, in shock wave modulation, a high-impulse shock wave chases a high-amplitude shock wave, and the two superimpose to form a high-amplitude, high-impulse shock wave. The generation time of the high-amplitude, high-impulse shock wave is synchronized with the high-amplitude, short-pulse component, and its amplitude is adjusted jointly by the high-amplitude, short-pulse component and the metal wire parameters. Specifically, the adjustment method or direction is as follows: according to the actual shock wave requirements, adjust the metal wire size and the amplitude of the high-amplitude power pulse component, adjust the overheating coefficient, and adjust the shock wave amplitude. The generation time of the high-impulse shock wave is synchronized with the low-amplitude, long-pulse component, and its impulse is adjusted jointly by the long-pulse component and the metal powder parameters.

[0035] In practice, the parameters of the composite shock wave are adjusted according to the measured parameters of the object being blasted to meet the fragmentation requirements of the object. The composite shock wave is applied to the object being blasted through a shock wave propagation medium, suppressing shock wave attenuation during the process. The propagation medium must meet the following requirements: the acoustic characteristics of the shock wave propagation medium should be similar to those of the object being blasted; for rocks, polyethylene is often used as the shock wave propagation medium. The high-amplitude shock wave amplitude is higher than the tensile strength of the object being blasted, inducing fracturing and reducing the strength of the object, making its tensile strength lower than the amplitude of the high-impulse shock wave. After the intensity of the high-impulse shock wave decreases, the range of action of the composite shock wave is expanded, and the controlled fragmentation of the object is achieved.

[0036] Figure 6 This is a schematic diagram illustrating the composite shock wave and the fragmentation of the blasted object in a high-energy hydraulic detonation method with composite power modulation provided in an embodiment of the present invention. Figure 6 As shown, the composite shock wave is formed by the combination of a high-amplitude shock wave and a high-impulse shock wave. At a distance of 6 cm from the load, the peak value of the shock wave is 20 MPa, and the impulse of the shock wave is 2500 Pa·s. In this embodiment, the object to be blasted is granite. A pre-drilled hole with a diameter of 8 cm is drilled in the granite, and the load is placed in the pre-drilled hole for discharge. The tensile strength of the granite is 10 MPa, which is lower than the peak value of the composite shock wave. After the shock wave is loaded, the object to be blasted develops cracks, and its tensile strength decreases to 2 MPa. Under the action of the high-impulse shock wave component, the overall fragmentation and peeling between the pre-drilled hole and the free surface are achieved.

[0037] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-energy hydroelectric detonation method with composite power modulation, characterized in that, This application is used when pulsed power is applied to a load to generate a shock wave. The load is formed by a combination of metal wire and metal powder, and includes composite power modulation, load energy modulation, shock wave waveform modulation, and shock wave loading modulation. In composite power modulation, a high-amplitude short-pulse-width pulse is superimposed with a low-amplitude long-pulse-width pulse to form a composite power pulse; In load energy modulation, the high-amplitude short-pulse-width pulse component in the composite power pulse is used to achieve rapid energy deposition in the phase transition stage of the metal wire, while the low-amplitude long-pulse-width pulse component is used to maintain the plasma channel and improve the energy deposition in the plasma channel stage so as to ignite the metal powder and release energy. In the modulation of composite shock wave waveform, a high-amplitude shock wave is generated during the rapid phase transition stage of the metal wire, and a large-impulse shock wave is generated during the expansion stage of the plasma channel and the combustion stage of the metal powder. The high-amplitude shock wave component and the large-impulse shock wave component chase and superimpose to form a composite shock wave. The composite shock wave waveform can be adjusted by adjusting the high-amplitude shock wave component and the large-impulse shock wave component. In shock wave loading modulation, high-amplitude components are used to induce fracturing in the blasted object, reducing its strength, while large-impulse components are used to expand the fragmentation range, achieving controllable fragmentation of the blasted object. In composite power modulation, the high-amplitude, short-pulse-width pulse component precedes the low-amplitude, long-pulse-width pulse component in timing, and their timing can be adjusted according to application requirements. Low-amplitude, long-pulse-width pulse components can be synthesized from multiple pulses, and the timing of each pulse can be arbitrarily adjusted. By adjusting the timing, composite power pulses of arbitrary waveforms can be generated. When a composite power pulse is applied to a load formed by a metal wire and metal powder assembly, the metal wire rapidly deposits electrical energy during the phase transition process under the influence of the high-amplitude, short-pulse-width pulse component. Through melting and vaporization processes, it generates melting shock waves and vaporization shock waves, respectively. The vaporization shock wave chases the melting shock wave, and the two superimpose to form a high-amplitude shock wave. This high-amplitude shock wave can be adjusted by modifying the high-amplitude, short-pulse-width pulse component in the composite power pulse and the parameters of the metal wire. Phase transition refers to the process by which a metal wire changes from a solid state to a liquid state and finally to a gaseous state under the action of a composite power pulse. After the phase transition is completed, the metal wire undergoes vapor breakdown, forming an initial plasma channel. After the initial plasma channel is formed, electrical energy is continuously deposited under the action of low-amplitude long-pulse-width pulse components. The internal energy of the plasma channel increases, expands outward, and generates plasma channel shock waves. It also continuously generates light and heat radiation, igniting the metal powder. The metal powder reacts with the liquid medium to generate combustion and explosion shock waves. The combustion and explosion shock waves chase the plasma shock waves to form high-impulse shock waves. The high-impulse shock waves can be adjusted by regulating the low-amplitude long-pulse-width pulse components and the parameters of the metal powder.

2. The high-energy hydraulic detonation method with composite power modulation as described in claim 1, characterized in that, In composite shock wave waveform modulation, a high-impulse shock wave chases a high-amplitude shock wave, and the two superimpose to form a high-amplitude, high-impulse composite shock wave. The generation time of the high-amplitude shock wave is synchronized with the high-amplitude, short-pulse-width pulse component. The high-amplitude shock wave is adjusted by regulating the high-amplitude, short-pulse-width pulse component and the metal wire parameters. The generation time of the high-impulse shock wave is synchronized with the low-amplitude, long-pulse-width pulse component. The impulse of the high-impulse shock wave is adjusted by regulating the low-amplitude, long-pulse-width pulse component and the metal powder parameters.

3. The high-energy hydroelectric detonation method with composite power modulation as described in claim 2, characterized in that, In shock wave loading modulation, the composite shock wave parameters are adjusted according to the measured parameters of the object being blasted to meet the fragmentation requirements of the object being blasted.

4. The high-energy hydroelectric detonation method with composite power modulation as described in claim 3, characterized in that, The composite shock wave is applied to the object being blasted through the shock wave propagation medium, thereby suppressing the attenuation of the shock wave during the process.

5. The high-energy hydroelectric detonation method with composite power modulation as described in claim 4, characterized in that, The high-amplitude shock wave has an amplitude higher than the tensile strength of the object being blasted, causing it to fracture and reducing its strength. This reduces the tensile strength of the object to be lower than that of the high-impulse shock wave. The reduced intensity of the high-impulse shock wave expands the range of the composite shock wave and enables the controlled fragmentation of the object.

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