High-Power Microwave Borehole Fracturing Device
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Solution Overview
Problem
Conventional microwave generators and coaxial transmission lines are inadequate for high-power borehole fracturing due to low power capacity, small radiation range, and inability to adapt to dynamic load impedance changes in engineering rock masses, leading to inefficient fracturing and equipment instability.
Innovation Solution
A high-power microwave borehole fracturing device incorporating a compact high-power microwave generator with a permanent magnet and coaxial circulator, a high-power microwave coaxial heater with enhanced radiation capabilities, and a microwave power adaptive regulation and control system for real-time impedance matching, utilizing a low-loss coaxial transmission line for efficient energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional microwave generators with single-mode or multi-mode resonant chambers are used, then the equipment structure is simple and suitable for indoor tests, but the microwave power output is limited to about 30 kW which is insufficient for engineering rock mass fracturing
Solution Approach 1:
The patent combines multiple microwave heating modes (single-mode and multi-mode) within a single generator system, integrating the functions of different resonant chambers to achieve both structural simplicity and high power output capability of 100 kW or above
Solution Approach 2:
The patent changes the power output parameter from conventional 30 kW to 100 kW or above by redesigning the generator system, enabling it to meet the high power requirements for engineering rock mass fracturing while maintaining structural feasibility
2Power
If multiple groups of small power microwave heaters are stacked for heating, then the power capacity is increased, but the microwave energy radiated by the microwave heaters is coupled or offset with each other before being absorbed by the engineering rock mass, and therefore rock fracturing cannot be achieved
Solution Approach 1:
The patent employs multi-mode resonant chambers with different resonant frequencies to ensure that microwave energy from different sources does not interfere with each other, allowing each mode to effectively heat the rock mass without coupling or offset effects
Solution Approach 2:
The patent uses asymmetric arrangement of microwave heaters with different power outputs and resonant frequencies, preventing the microwave energies from being coupled or offset while achieving cumulative heating effect for rock fracturing
3Device complexity
If conventional microwave coaxial transmission lines are used, then the structure is simple, but the power capacity is low and microwave energy loss during remote transmission is high
Solution Approach 1:
The patent designs the coaxial transmission line with adjustable and adaptable structure that can be configured for different power levels and transmission distances, optimizing the balance between structural simplicity and high power capacity for remote transmission to boreholes
Solution Approach 2:
The patent changes the transmission line parameters including conductor dimensions, insulation material, and structural configuration to reduce microwave energy loss and increase power capacity while maintaining reasonable structural complexity
4Device complexity
If conventional microwave generators are used with dynamic load impedance changes in rock mass, then the equipment structure is simple, but impedance mismatch occurs inevitably leading to increased microwave reflected power and reduced equipment stability
Solution Approach 1:
The patent introduces a feedback control system that continuously monitors the load impedance of the rock mass and automatically adjusts the microwave generator parameters to maintain impedance matching, reducing reflected power and improving equipment stability
Solution Approach 2:
The patent implements dynamic impedance matching capabilities that allow the generator to adapt its output characteristics in real-time according to the changing load conditions of the rock mass, preventing instability caused by impedance mismatch
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively meets the high-power requirements for borehole fracturing, reduces equipment instability, and enhances the fracturing efficiency by ensuring real-time impedance matching, allowing for practical engineering applications of microwave-assisted rock fracturing technology.
Implementation Method 1
a permanent magnet is used in the high-power microwave generator for the first time to provide a magnetic field
Implementation Method 2
DC electrical energy is converted into microwave energy by the continuous wave magnetron
Implementation Method 3
a coaxial circulator is used in the high-power microwave generator for the first time to isolate microwave reflected power
Implementation Method 4
The high-power microwave coaxial heater has higher power capacity and larger microwave radiation range
Implementation Method 5
the microwaves are radiated to the engineering rock mass, the rate of temperature rise of the engineering rock mass is low
Implementation Method 6
a high-power low-loss microwave coaxial transmission line is used for transmitting impedance-matched microwaves into the high-power microwave coaxial heater
Implementation Method 7
the microwave power adaptive regulation and control system achieves the adaptive regulation and control of the microwave power, when the load impedance of the rock changes dynamically, the real-time matching requirement of impedance can be met
Data Source
AI summary
A high-power microwave borehole fracturing device for an engineering rock mass includes a high-power microwave generator, a high-power microwave coaxial heater, a high-power low-loss microwave coaxial transmission line, and a microwave power adaptive regulation and control system. The high-power microwave generator includes a continuous wave magnetron, a permanent magnet, a waveguide excitation chamber, a coaxial circulator, a coaxial matching load, a coaxial coupling converter, a waveguide coaxial converter, and an output waveguide. The high-power microwave coaxial heater includes a microwave transmission inner conductor, a microwave transmission outer conductor, a microwave input connector, a microwave short circuit cap, and a conductor supporting cylinder. The high-power low-loss microwave coaxial transmission line includes an input end coaxial line, middle section coaxial lines, and an output end coaxial line. The microwave power adaptive regulation and control system includes an impedance matching regulator, a microwave power controller, and a temperature sensor.