Roller Mill Aspiration Opening Pressure Control
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Solution Overview
Problem
Existing roller mills face issues with dust escape and condensate formation when the inspection opening is opened, leading to contamination and increased cleaning needs, as the pressure changes disrupt the aspiration system, allowing dust to escape into the environment.
Innovation Solution
A roller mill design featuring a closable partition wall with an aspiration opening that automatically opens or closes based on pressure differences between the grinding and aspiration spaces, eliminating the need for aspiration plates and reducing dust escape by controlling airflow through the inspection opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aspiration plates are installed to maintain air pressure during inspection opening operation, then dust escape is reduced, but condensate formation increases due to temperature differences in the air flow
Solution Approach 1:
The invention extracts and removes the aspiration plates from the system entirely. Instead of using aspiration plates to maintain air pressure, the design allows the inspection opening to remain open without requiring these intermediate components, thereby eliminating the source of temperature differences that caused condensate formation while still preventing dust escape through the open inspection opening
Solution Approach 2:
The invention converts the potentially harmful effect of open inspection opening (which could allow dust escape) into a beneficial state by designing the system so that the open inspection opening no longer causes dust escape. The aspiration air flow pattern is modified to maintain positive pressure in the grinding chamber even with the inspection opening open, turning what was a problematic condition into an acceptable operating state
2Ease of operation
If the inspection opening is opened for routine checks, then operational monitoring is improved, but air pressure changes cause dust to escape into the environment
Solution Approach 1:
The invention ensures continuous containment of dust throughout operation by maintaining positive air pressure in the grinding chamber even when the inspection opening is open. The aspiration system continuously draws air through the grinding chamber, preventing dust from escaping through the open inspection opening, thus maintaining the useful action of dust containment without interruption during routine monitoring
3Object-affected harmful factors
If aspiration plates are used to control air flow during inspection, then dust containment is improved, but device complexity and cleaning requirements increase
Solution Approach 1:
The invention completely removes the aspiration plates from the system. The design achieves dust containment without requiring these additional components by relying on the aspiration air flow pattern and pressure differential maintained by the ventilation system, thereby reducing device complexity and eliminating the cleaning requirements associated with maintaining aspiration plates
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 minimizes dust escape into the environment and eliminates the need for aspiration plates, reducing cleaning efforts and condensate formation by maintaining controlled airflow, even when the inspection opening is opened.
Implementation Method 1
at least one closure element for opening and closing the aspiration opening, which is designed and arranged and/or controllable in such a manner that it is located in an open position in which it opens the aspiration opening when the pressure difference exceeds a threshold value, and it is located in a closed position in which it closes the aspiration opening when the pressure difference undershoots the threshold value
Implementation Method 2
a pneumatic conveying system arranged in the region of the discharge of the roller mill hopper... which ensures that there is a reduced pressure in the grinding space, and this ensures that the grinding dust cannot escape from the inspection opening into the environment on account of the air draft which arises when the inspection opening is opened
Implementation Method 3
Frictional heat arises from the grinding rollers during the operation of a roller mill. Said frictional heat heats the air in the grinding space to a relatively high degree
Data Source
AI summary
A roller mill (10) for grinding material, an aspirating assembly (23; 23′) and a method of retrofitting an existing roller mill. The roller mill (10) contains a grinding space (11, 11′) for grinding material, a separating wall (17) separates the grinding space from an aspiration space (21, 21′). At least one aspiration opening (13), is formed in the separating wall (17) through which aspiration air can flow due to a pressure difference between the aspiration space and the grinding space. The roller mill (10) has a closing element (14) for opening and closing the aspiration opening (13). The closing element (14) is in or moves into an opening position (O), which opens the aspiration opening (13), when the pressure difference exceeds a threshold value, and is in or moves into a closing position (S), which closes the aspiration opening (13), when the pressure difference falls bellow the threshold value.