Explosive Emulsion Density Control via Coaxial Mixing
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Solution Overview
Problem
Current methods for producing explosive emulsions for mining and extraction are limited in their ability to vary the density of the explosive product in real time during filling, leading to inefficient energy distribution and increased costs due to the need for multiple fillings and complex, fragile piping systems.
Innovation Solution
A method using flexible coaxial pipes with a static mixer at the downstream end to mix and control the proportions of an inverse emulsion matrix and a gasification reagent separately transferred from distant tanks, allowing for real-time adjustment of the explosive product's density during a single filling cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate transfer circuits for matrix and gasification reagent are used with flexible pipes, then adaptability and ease of operation are improved, but device complexity increases
Solution Approach 1:
The system divides the transfer process into two separate circuits: one for the matrix and one for the gasification reagent. This segmentation allows independent control of each component's flow rate, enabling real-time density adjustment without requiring complex integrated systems. Each circuit can be optimized separately, reducing overall system complexity while maintaining high adaptability.
Solution Approach 2:
The system employs variable speed pumps in each transfer circuit that can be dynamically adjusted to change flow rates in real time. This dynamic control capability allows the density of the explosive product to be varied continuously during filling operations, providing high adaptability while using relatively simple pump control mechanisms rather than complex valve systems.
2Manufacturing precision
If dense explosive product is filled first and then less dense product is added, then manufacturing precision is improved, but loss of time increases due to multiple fillings
Solution Approach 1:
The system performs density variation and filling operations in a single continuous process. By controlling the flow rates of matrix and gasification reagent simultaneously throughout the filling operation, the desired density distribution is achieved in one continuous filling action rather than requiring multiple separate filling steps, thereby eliminating time losses associated with stopping and restarting the filling process.
Solution Approach 2:
The system pre-calculates and sets the appropriate flow rate ratios of matrix to gasification reagent based on the desired final density distribution. This preliminary configuration allows the correct density profile to be achieved automatically during the single filling operation, eliminating the need for subsequent adjustments or multiple fillings while maintaining high manufacturing precision.
3Manufacturing precision
If static mixer is placed inside the borehole, then mixing precision is improved, but object-generated harmful factors increase due to impact risks
Solution Approach 1:
The static mixer is extracted from the borehole environment and positioned outside, in the transfer circuit. This removes the potential source of impact sparks and damage from the hazardous zone. The mixing function is maintained through the external static mixer, and the already-mixed explosive product is then transferred into the borehole, eliminating the harmful effects while preserving mixing precision.
Solution Approach 2:
The system uses the transfer circuit as an intermediary zone where mixing occurs before the explosive product enters the borehole. The static mixer in the transfer circuit acts as a safe intermediate mixing location, allowing thorough mixing to occur in a controlled environment away from the borehole, thereby preventing impact hazards while maintaining mixing quality.
Data Source
Figure 1~1B
Figure 2
Figure 3~3A
AI summary
The present invention relates to an in situ method for producing an explosive product (10). Said method includes the steps wherein: 1) an emulsion-containing matrix and a gasification reagent are separately transferred to a first mixer (7) from tanks (1-1, 1-2) containing them; 2) they are mixed in a first mixer (7); and 3) said explosive product obtained from said first mixer is transferred and deposited into an explosion hole (11). Said method is characterized in that: - in Step 1), the amounts and/or flow rates of said matrix and gasification reagent entering into said first mixer are controlled and monitored so as to produce a so-called explosive product having a density of a predetermined value when removed from the first mixer in Step 2); and - in Step 3), the density of the explosive product obtained is varied, during filling of a single hole, according to the deposited amount of explosive product and/or the depth at which the explosive product was deposited in said hole, or said density is varied from one hole to another in different holes.