Spiral Jet Mill Nozzle Segmentation for Gas Flow Control
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Solution Overview
Problem
Spiral jet mills face challenges in efficiently regulating grinding gas flow and pressure, leading to reduced grinding action and efficiency, particularly due to the need for complex adjustments and energy-inefficient throttling in existing systems.
Innovation Solution
Equipping each grinding gas nozzle with a switchable shut-off mechanism allows for independent control of the gas flow, enabling optimal pressure and speed maintenance regardless of the number of open nozzles, thereby improving grinding action and efficiency by varying the number of active nozzles and their cross-sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the grinding gas mass flow or pressure is regulated by inserting a throttle valve into a central supply line, then the grinding gas flow can be controlled, but the speed of the grinding gas flow at the outlet of the nozzles is reduced, which has a negative impact on grinding action and efficiency
Solution Approach 1:
The patent divides the single central supply line into multiple separate supply lines, each leading to an individual grinding gas nozzle. Each nozzle is equipped with its own switchable shut-off mechanism, allowing independent control of gas flow to each nozzle without affecting the pressure and speed at other nozzles. This segmentation eliminates the throttling problem while maintaining operational control.
Solution Approach 2:
The patent incorporates flow measuring devices at each nozzle to monitor the actual grinding gas flow. This feedback information is used by the control unit to adjust the shut-off mechanisms and maintain optimal flow conditions, ensuring that the grinding gas reaches each nozzle at the required speed and pressure regardless of the number of active nozzles.
2Quantity of substance
If the number of open nozzles is increased to maintain grinding gas flow, then the total flow is maintained, but the pressure and speed at each individual nozzle are reduced, impacting grinding efficiency
Solution Approach 1:
By providing separate supply lines for each nozzle with individual shut-off mechanisms, the system allows selective activation of nozzles. When fewer nozzles are active, each receives the full pressure and flow required for optimal performance. The total gas consumption is adjusted by controlling the number of active nozzles rather than reducing flow to all nozzles, thus maintaining grinding efficiency.
3Device complexity
If a central supply line with a throttle valve is used to regulate grinding gas, then the system structure is simple, but the controllability and regulation precision are poor
Solution Approach 1:
The patent implements separate supply lines with individual switchable shut-off mechanisms for each grinding gas nozzle. This segmentation provides precise controllability of the grinding procedure by allowing independent activation and deactivation of nozzles. The control unit can selectively open or close specific nozzles based on process requirements, achieving fine-grained regulation without excessive complexity.
Solution Approach 2:
Flow measuring devices at each nozzle provide real-time feedback on the actual gas flow, which the control unit uses to adjust the shut-off mechanisms. This feedback loop enables precise regulation of the grinding process, allowing the system to maintain optimal operating conditions while providing excellent controllability.
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
This approach enhances controllability and efficiency by maintaining maximum pressure and speed of the grinding gas, allowing for broader regulation and energy-efficient operation, even during continuous processing, without energy-inefficient throttling.
Implementation Method 1
the milling material introduced into the grinding chamber is subjected to the action of a powerful grinding gas flow that has been accelerated to speeds of several hundred meters per second and travels into the grinding chamber from the grinding gas nozzles
Implementation Method 2
the flow of the incoming grinding gas takes on a spiral shape in the grinding chamber. The supplied milling material is captured by the gas jets, accelerated, and comminuted by reciprocal particle collisions. The milling material that has the desired grain size is discharged from the grinding chamber together with the calmed grinding gas at the rotational center point of the spiral flow
Data Source
AI summary
The invention relates to a spiral jet mill (1) having a grinding chamber (10), which is delimited by a bottom (11), a cover (12), and a wall (13) that connects the bottom (11) and the cover (12), and having a plurality of grinding gas nozzles (14) that pass through the wall (13) and are connected to a grinding gas source, wherein each of at least part of the grinding gas nozzles (14) is provided with an associated switchable shut-off mechanism (15), which is able to independently open and close the connection to the grinding gas source. In addition, a method for grinding milling materials in a spiral jet mill is also disclosed.