Compact Pulp Dryer Structure Air Flow Control
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Solution Overview
Problem
Existing pulp dryer structures and control systems face inefficiencies in air supply and exhaust management, leading to increased energy consumption, web instability, and dust generation, with unreliable measurements for regulating exhaust air and lack of control over supply air.
Innovation Solution
A compact dryer structure with integrated air supply and exhaust systems, where air is directly supplied to the bottom part and exhausted from the top, allowing for reduced ducting and fan usage, and a control system that regulates air flow based on production-level variables like temperature and pressure to maintain optimal air balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate supply part and cooling section are used in the dryer structure, then air supply and cooling functions are provided, but device complexity and energy consumption increase
Solution Approach 1:
The patent merges the supply part and cooling section into a single integrated bottom part. The bottom part simultaneously performs air supply functions and cooling functions that were previously separated into different components, thereby reducing device complexity while maintaining operational effectiveness
Solution Approach 2:
The bottom part is designed as a multi-functional component that combines air supply, cooling, and structural support functions. This universal design eliminates the need for separate dedicated components for each function, reducing overall system complexity
2Productivity
If traditional air supply and exhaust systems are used, then air flow is provided, but energy consumption increases due to longer ducting and more fans
Solution Approach 1:
By integrating the air supply and exhaust functions into the bottom part and exhaust part respectively, the patent reduces the number of separate fans and extends shorter ducting paths, thereby reducing energy consumption while maintaining air flow efficiency
Solution Approach 2:
The patent extracts and eliminates the separate supply part from the traditional dryer structure, reducing the number of components and associated energy losses. The supply function is directly integrated into the bottom part, reducing ducting length and fan requirements
3Temperature
If cooling air is supplied into the building from the cooling section, then cooling function is provided, but humidity load on the building increases
Solution Approach 1:
The patent extracts the cooling air supply function from the building environment and redirects it to be supplied directly to the bottom part of the dryer structure. This prevents cooling air from increasing the building's humidity load while maintaining the cooling function
Solution Approach 2:
The bottom part acts as an intermediary that receives cooling air and directs it to the appropriate location within the dryer structure, preventing direct release of cooling air into the building environment and thus reducing humidity load
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 reduces energy consumption, stabilizes web runnability, minimizes dust and web breaks, and enhances heat recovery efficiency by optimizing air flow control, ensuring reliable measurements and reduced humidity loads within the building.
Implementation Method 1
a drying gas is blown, which is e. g. hot air, steam or any other medium suitable for the purpose, through a nozzle from both sides towards the web
Implementation Method 2
From the upper exhaust part 121 the exhaust air is exhausted to a heat recovery 131 where supply air can be preheated
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention refers to a dryer structure for a pulp making process. The dryer structure comprises a compact dryer unit, means (33, 34) for supplying air to the bottom part (23), and means (31) for exhausting air from the exhaust part (21). The compact dryer unit consists of an integrated exhaust part (21) on one end side of said dryer unit, a dryer part (22) arranged adjacent to the exhaust part (21), and a bottom part (23) on the opposite end side of said dryer unit. The bottom part (23) is arranged adjacent to the dryer part (22). The invention further refers to a control system for a dryer and a control method for a dryer.