Explosive Charge Recovery via Pneumatic Fluidization
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Solution Overview
Problem
Current methods for recovering explosive charges from suspensions are inefficient, requiring extensive energy consumption, long operating times, and pose risks due to mechanical stresses and pyrotechnical hazards, making them unsuitable for handling sensitive explosive materials.
Innovation Solution
A process involving filtration, dewatering under gas pressure, and disintegration using controlled gas jets to create a fluidized bed of the explosive charge, minimizing mechanical stress and energy consumption while ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the cake is scraped mechanically to fragment it, then the explosive charge is broken up, but the mechanical stresses may detonate the explosive charge due to sensitivity to friction and static electricity
Solution Approach 1:
The patent replaces mechanical scraping systems with a pneumatic system. Gas jets are injected through the filter support screen to fluidize and break up the cake from the underside, eliminating direct mechanical contact with the explosive charge that could cause detonation through friction or static electricity.
Solution Approach 2:
The patent utilizes the porous structure of the filter support screen to distribute gas jets uniformly across the cake. The gas passes through the porous screen to reach the cake from below, enabling gentle fluidization and fragmentation without concentrated mechanical stress points that could trigger detonation.
2Productivity
If hot gases are injected at high flow rate to break up the cake, then drying efficiency is improved, but the cake breaks up suddenly and uncontrollably creating major mechanical stresses
Solution Approach 1:
The patent employs dynamic control of gas flow parameters, adjusting pressure and flow rate during the process. The gas jets are controlled to progressively fluidize and break up the cake rather than applying sudden high-energy冲击, maintaining controlled stress levels while achieving efficient drying.
Solution Approach 2:
The patent uses periodic or pulsed gas injection through the filter support screen to gradually break up the cake. This periodic action allows the cake to fluidize and fragment in a controlled manner over time, preventing sudden uncontrollable break-up while maintaining drying efficiency.
3Quantity of substance
If the cake is dried in an oven for 1 to 2 days, then moisture content is reduced to less than 0.1%, but energy consumption is very high and operating time is very long
Solution Approach 1:
The patent uses pneumatic drying with gas jets injected through the filter support screen to remove moisture from the cake. This pneumatic approach is much faster and more energy-efficient than conventional oven drying, achieving low moisture content in significantly reduced time without the high energy consumption of thermal ovens.
Solution Approach 2:
The patent implements continuous drying action through sustained gas jet injection throughout the filtration and drying process. The gas flows continuously through the filter support screen and cake, maintaining constant moisture removal activity that achieves rapid drying without the extended time and energy requirements of batch oven drying.
4Ease of operation
If the cake is spread manually over trays, then handling is possible, but operator exposure to explosive material increases pyrotechnical risks
Solution Approach 1:
The patent enables the cake to be broken up and dried in situ on the filter without manual handling. The pneumatic system performs the fragmentation and drying automatically, eliminating the need for operators to manually spread and handle the explosive cake, thereby removing the associated pyrotechnical risks.
Solution Approach 2:
The patent extracts the hazardous manual handling step from the process entirely. By implementing in-situ pneumatic breaking and drying, the system removes the intermediate step where operators would handle the explosive material on trays, eliminating exposure and associated risks.
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 process effectively reduces moisture content to less than 1% and achieves efficient recovery of explosive charges in granular form with reduced handling risks and energy consumption, producing a high-quality final product.
Implementation Method 1
disintegrating the cake retained on the filter and obtaining a fluidized bed of the explosive charge in dry and granular form
Implementation Method 2
by the action on the cake retained on the filter of at least one jet of gas injected under the cake
Implementation Method 3
dewatering the cake retained on the filter by placing it under gas pressure
Implementation Method 4
filtering by passage through a static filter the suspension to be treated, in order to obtain a cake resting on the filter including the explosive charge agglomerated by the residual liquid
Data Source
AI summary
A method for obtaining the explosive charge in dry granular form as well as a device suitable for implementing the method. The method includes: filtering the suspension, by passing same through a static filter in order to obtain a cake containing the granular explosive charge agglomerated by residual liquid; dewatering the cake by subjecting the cake to pressurized gas; splitting the dewatered cake and obtaining a fluidized bed of the desired explosive charge by exposing the dewatered cake to at least one stream of gas; at least one stream of gas being injected, under the dewatered cake to impinge said dewatered cake, according to two consecutive modes and the gas having a humidity height below that of the dewatered cake and a dew point temperature higher than the injection temperature thereof; and stopping at least one stream of gas and recovering the explosive charge in dry, granular form.