Granulate Conveying and Drying with Adaptive Vacuum Relief Control
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Solution Overview
Problem
Conventional conveying and drying systems for granulated materials face inefficiencies due to the use of fixed-speed induction motors and variable frequency drives (VFDs, which have limited operational speed ranges and generate electrical harmonics, and relief valves that require manual adjustment for safety.
Innovation Solution
Integration of Interior Permanent Magnet Synchronous Motors (IPMSM), Permanent Magnet Synchronous Motors (PMSM), and Internal Permanent Magnet Synchronous Reluctance Motors (IPM-SynRM) to control vacuum/pressure systems, with real-time adjustments based on sensors and predetermined criteria to optimize energy efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed-speed induction motors are used in conveying systems, then the system structure is simple, but the operational efficiency and energy consumption are poor
Solution Approach 1:
The patent applies parameter changes by transitioning from fixed-speed induction motors to variable-speed permanent magnet synchronous motors. This allows the motor speed and torque parameters to be dynamically adjusted according to actual operational demands, optimizing energy consumption while maintaining simple system architecture through integrated motor-drive units.
2Speed
If variable frequency drives are used to control motor speed, then the operational speed range is wider, but electrical harmonics are generated and cooling issues occur at low speeds
Solution Approach 1:
The patent replaces the conventional VFD control system with direct torque control of permanent magnet synchronous motors. This substitution eliminates the need for traditional VFDs that generate electrical harmonics, while achieving wide speed range control through advanced motor control algorithms that provide smooth torque delivery across the entire operational spectrum without cooling issues.
3Reliability
If relief valves are used to prevent excessive vacuum or pressure, then equipment safety is ensured, but manual adjustment is required and operational flexibility is reduced
Solution Approach 1:
The patent implements feedback control by integrating sensors that continuously monitor vacuum and pressure levels, with the control system automatically adjusting motor speed and torque to maintain safe operational parameters. This eliminates manual relief valve adjustment while providing real-time adaptive control that ensures equipment safety and maximizes operational flexibility.
4Ease of operation
If conventional induction motors are used in drying systems, then the system is simple to operate, but energy efficiency and drying performance are suboptimal
Solution Approach 1:
The patent applies dynamics by replacing static fixed-speed motors with dynamic variable-speed permanent magnet synchronous motors in drying systems. The motor speed is continuously adjusted based on real-time moisture content feedback, optimizing energy efficiency while maintaining simple operation through automated control that adapts to varying drying conditions.
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
Enhances operational efficiency, reduces maintenance, and optimizes energy consumption by dynamically adapting to varying operational demands, while ensuring safe operation through intelligent control of vacuum/pressure levels.
Implementation Method 1
an IPM-SynRM motor configured to generate a magnetic field that interacts with a stator to produce rotational torque
Implementation Method 2
a motor configured to generate a torque that drives the impeller in rotation
Implementation Method 3
a blower configured to generate a vacuum or a pressurized airflow, and including a housing, and an impeller mounted in the housing and configured to rotate in relation to the housing
Implementation Method 4
a dryer that receives the process air from the drying hopper after the process air has absorbed the moisture from the granular material. The dryer may include a desiccant material that absorbs the moisture from the process air
Implementation Method 5
one or more heater/blower units that heat dry process air and circulate the process air through a drying hopper in which the granulated material resides, so that the heated air can remove moisture from the granulated material
Data Source
AI summary
Systems for conveying granulated materials from a material source include a receiver in fluid communication with a material source, a vacuum generator or a pump unit having a blower configured to generate a vacuum or a pressurized airflow that transports the granulated material to the receiver from the material source, and a combination relief and break valve located in the flow path between the blower and the receiver. The valve is configured to interrupt the vacuum or the pressurized airflow provided to the receiver when the vacuum level or the positive pressure level reaches a relief set point. An electronic control unit of the system is configured to automatically adjust the relief set point based on one or more predetermined criteria. The vacuum generator or the pump unit can include an IPM-SynRM motor, IPMSM motor, or a PMSM motor that drives the blower of the impeller in rotation.