Plastic Material Drying Hopper Airflow Regulation to Reduce Energy Waste
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plastic material drying processes in drying hoppers are inefficient, leading to excessive dry air usage and potential overdrying due to non-optimal air volume distribution, resulting in energy waste and material damage.
Innovation Solution
A method and system that regulate the actual air volume supplied to each drying hopper based on flow measurement, using a flow measuring orifice and differential pressure-air characteristic curve, adjusting the air flow through a control system and control valve to ensure only the required amount of dry air is used, minimizing energy consumption and preventing overdrying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dry air generator supplies maximum air volume to all drying hoppers based on 100% design capacity, then all hoppers receive sufficient air for drying, but smaller hoppers receive excessive air volume leading to energy waste and potential overdrying
Solution Approach 1:
The invention divides the air supply system into individual controllable segments for each drying hopper. Each hopper is equipped with its own control flap that can independently regulate air flow, allowing the system to segment the total air volume according to the specific needs of each hopper size and drying requirement, rather than supplying uniform maximum air to all hoppers
Solution Approach 2:
The invention implements dynamic air volume regulation through control flaps that can adjust in real-time based on actual drying needs. The control flaps enable the air supply system to adapt dynamically to varying drying requirements of different hoppers, transitioning from a static fixed air volume distribution to a dynamic adjustable system that optimizes energy usage while maintaining reliable drying performance
2Reliability
If more dry air is supplied to ensure adequate drying capacity, then drying reliability is improved, but energy consumption increases and material may be overdried
Solution Approach 1:
The invention implements feedback control by measuring the actual air volume supplied to each drying hopper and using this information to regulate the control flaps. The system continuously monitors air flow and adjusts the air supply to match the precise requirements of each hopper, preventing both insufficient drying and overdrying conditions while maintaining optimal energy efficiency
3Productivity
If the air volume is increased to meet the requirements of larger drying hoppers, then large hoppers achieve proper drying, but smaller hoppers receive more air than needed resulting in energy waste
Solution Approach 1:
The invention applies local quality control by tailoring the air supply characteristics to each specific drying hopper's requirements. Each hopper receives air volume and flow characteristics optimized for its size, material type, and drying needs, rather than receiving uniform air supply. This localized optimization ensures that small hoppers don't receive excessive air while large hoppers get sufficient air volume for their capacity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a method for drying plastic material in the form of granules, powder, and the like, dry air is generated by at least one dry air generator (17), which is passed through plastic material located in a drying hopper (1). The dry air absorbs the moisture in the plastic material and exits the drying hopper (1) as return air. By means of a flow measurement, the actual air quantity of the dry air supplied to the drying hopper (1) is recorded and regulated to a target air quantity. In addition, the actual total air quantity of the dry air exiting the dry air generator (17) is regulated to a target total air quantity. At least two drying hoppers (1) are connected to the dry air generator (17) by means of a dry air line (2, 2') and a return air line (3, 3'). A flow measuring orifice (8) is located in the dry air line (2, 2'), upstream of which is a motor-adjustable control flap (7).