Box-like Runnability Component for Paper Machine Drying Section
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Solution Overview
Problem
The drying section of paper machines experiences runnability issues due to web detachment at opening and closing nips, and existing energy-saving methods consume significant energy to maintain web contact with drying wires.
Innovation Solution
An arrangement with a box-like runnability component and sealing elements is used to create underpressure in the pocket space between drying cylinders and a turning suction roll, reducing energy consumption by intensifying the suction effect without increasing air flow, thereby maintaining web contact and reducing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If runnability components (blow or suction boxes, turning suction rolls) are used to create underpressure in the pocket space, then web contact with wire is improved and runnability is enhanced, but energy consumption increases considerably
Solution Approach 1:
The invention changes the pressure parameters by creating a localized underpressure zone only in the pocket space between the drying cylinder and turn roll, rather than applying underpressure throughout the entire drying section. This localized parameter change maintains web contact at critical points while reducing overall energy consumption
Solution Approach 2:
The invention applies underpressure locally only where needed - in the pocket space between the drying cylinder and turn roll - rather than throughout the entire drying section. The box-like structure with sealing elements creates a localized underpressure zone that improves web contact at opening and closing nips without the energy cost of system-wide underpressure
2Reliability
If higher underpressure is applied in the pocket space to ensure web contact, then runnability improves, but energy consumption increases
Solution Approach 1:
The invention segments the drying section into distinct pressure zones: a localized underpressure zone in the pocket space and atmospheric pressure zones elsewhere. The box-like structure with sealing elements creates this segmentation, applying underpressure only where web contact is problematic while leaving other areas at normal pressure, thus reducing overall energy consumption
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 solution significantly reduces energy consumption in the drying section by up to 20% while maintaining production rate or increasing running speed, enhancing runnability and energy efficiency.
Implementation Method 1
on the entry side the runnability component has an entry side blow nozzle in connection with a gap between the runnability component and the first drying cylinder in order to blow air substantially against the travelling direction of the web run
Implementation Method 2
A first sealing element is arranged in the lower part of the runnability component, in a gap between the runnability component and the turn roll, in order to seal said gap and thereby to intensify the operation of the turn roll
Implementation Method 3
a turning suction roll... The underpressure promotes keeping of the web in contact with the wire and thereby improves the runnability of a paper machine
Data Source
AI summary
The invention relates to an arrangement and a method of a paper machine or the like for saving energy in the drying section. According to the invention, in the drying section of a paper machine or the like in connection with a pocket space (9) between two drying cylinders (1, 2) and one turn roll (3), there are the following delimiting said pocket space (9): a first drying cylinder (1), a second drying cylinder (2), a turning suction roll (3) and a wire (5, 5a, 5b), which is arranged to travel from the first drying cylinder (1) to the turning suction roll (3) and from there on to the second drying cylinder (2). The arrangement further comprises a box-like runnability component (10) and a sealing element (19) arranged in the lower part of the runnability component (10), in the gap between the runnability component and the turning suction roll (3) in order to seal said gap and thereby to promote the operation of the turning suction roll (3).