Biaxial Dynamic Separator with Automatic Baffle Regulation
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Solution Overview
Problem
The varying quality of coal for thermal power plant boilers leads to inefficient coal powder fineness and increased circulation rates in pulverizing systems, causing operational safety and economic issues, which existing dynamic separators struggle to address effectively.
Innovation Solution
A high-efficiency tandem biaxial dynamic sorting and return powder milling device with automatic baffle regulation, utilizing multi-stage sorting techniques, centrifugal sorting, axial ventilation, and spiral outlet pipe design to reduce resistance and improve coal powder fineness adjustment, combined with wear-resistant gear sets for milling unqualified powders into qualified ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tandem biaxial coarse powder separator is used, then separation efficiency is improved and resistance is reduced, but wear increases and powder deposition on baffles occurs
Solution Approach 1:
The patent employs a dynamic separator with rotatable baffles that can adjust their orientation during operation. The baffle shaft allows the baffles to rotate dynamically, preventing powder deposition by continuously changing the surface orientation relative to the powder flow, thereby resolving the wear and deposition issues while maintaining high separation efficiency.
2Manufacturing precision
If a dynamic separator is used in medium speed coal mills, then coal fineness adjustable range and uniformity are improved, but when coal quality deteriorates, fineness becomes finer, circulation rate increases, and resistance increases
Solution Approach 1:
The dynamic separator features adjustable baffle angles and rotatable components that can be modified in response to changing coal quality. When coal quality deteriorates, the system dynamically adjusts the baffle orientation and rotation speed to maintain optimal separation performance, preventing excessive fineness and controlling circulation rate.
Solution Approach 2:
The patent incorporates variable frequency motors that can change the rotation speed of the baffle shaft and separator components. By adjusting these operational parameters in response to coal quality variations, the system maintains stable fineness and controls circulation rate, resolving the contradiction between precision and productivity.
3Productivity
If multi-stage sorting and milling is implemented, then sorting efficiency is improved and circulation rate is reduced, but device complexity increases
Solution Approach 1:
The patent integrates the sorting and milling functions into a single unified device. The dynamic separator with its rotatable baffles and integrated milling gears combines multiple operations (separation, milling, and classification) in one compact structure, achieving high sorting efficiency without proportionally increasing device complexity.
Solution Approach 2:
The dynamic separator serves multiple functions simultaneously: it separates coal powder by size, mills returned powder, and controls airflow. This multi-functionality allows the single device to achieve high sorting efficiency and reduced circulation rate without requiring multiple separate components, thereby limiting the increase in device complexity.
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 the circulation rate and improves sorting efficiency, expanding the adjustable range of coal powder fineness, enhancing the operational reliability and adaptive capability of power station boilers to changing coal quality, while minimizing unit consumption and nitrogen oxide emissions.
Implementation Method 1
a variable frequency motor, an inner conical body, and an axial flow airfoil-type vane at the lower end of the inner conical body and a movable vane rotor at the upper end thereof; the inner conical body is driven to rotate by an output shaft of the variable frequency motor
Implementation Method 2
an axial flow airfoil-type vane at the lower end of the inner conical body
Implementation Method 3
a circle of milling gears for milling return powders is mounted in an annular cavity between the outer conical housing and the inner bearing bush fixing pipe
Data Source
AI summary
A high-efficiency, tandem biaxial dynamic sorting and return powder milling device with automatic baffle regulation, which is used for the sorting of a gas-solid two-phase fluid of an air-powder mixture, is provided. A circle of milling gears for staged milling of return powders is mounted in an annular cavity between an outer conical housing and an inlet pipe; an axial flow airfoil-type vane is fitted on an outer side of a lower part of an inner conical body which is, as a whole, driven into rotation by a variable frequency motor; a movable vane rotor for centrifugal sorting is fixedly fitted on an outer side of a top cone; and the degrees of opening of first-stage baffles and second-stage baffles are respectively controlled and regulated by an automatic baffle regulating mechanism.