Variable Orifice for Pulverized Coal Pipe
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Solution Overview
Problem
Conventional orifices in pulverized coal pipes of pulverizers face issues with erosion due to abrasion, leading to malfunction and high maintenance costs, and result in reduced coal conveyance and space inefficiency.
Innovation Solution
A variable orifice design with a diameter expansion portion and a hemispherical opening and closing system, featuring inner and outer plates with curved shapes that rotate in different directions, and a ceramic protection member to minimize erosion and facilitate maintenance, along with a power transmission mechanism for improved space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional orifices are used in pulverized coal pipes, then the cross-sectional area can be reduced to control conveying speed and pressure, but erosion due to abrasion occurs leading to malfunction and high maintenance costs
Solution Approach 1:
The patent applies composite materials by combining the orifice body with a protective lining material that has high abrasion resistance. The orifice body is made of one material while the inner surface is lined with a different material specifically selected to resist erosion from pulverized coal particles, creating a composite structure that combines the structural integrity of the base material with the erosion resistance of the lining material.
Solution Approach 2:
The patent implements beforehand cushioning by providing a protective lining or coating on the orifice surface before the abrasion damage occurs. This protective layer acts as a sacrificial element that absorbs the erosive impact of pulverized coal particles, protecting the main orifice body from direct damage and extending its service life.
2Productivity
If conventional orifices are used in pulverized coal pipes, then the cross-sectional area can be reduced to control conveying speed and pressure, but the conveyance amount of pulverized coal is reduced
Solution Approach 1:
The patent applies dynamics by providing an adjustable orifice mechanism that can change its opening size dynamically. Instead of a fixed orifice, the system includes an actuator that can adjust the orifice aperture based on operational requirements, allowing optimization of the balance between conveying speed control and maintaining sufficient coal flow rate.
Solution Approach 2:
The patent implements parameter changes by allowing the orifice opening area to be variable rather than fixed. The system can adjust the orifice parameter (opening size) to optimize performance under different operating conditions, thereby maintaining both effective speed control and adequate coal conveyance quantity.
3Area of stationary object
If conventional orifices are used in pulverized coal pipes, then the cross-sectional area can be reduced to control conveying speed and pressure, but space utilization is inefficient
Solution Approach 1:
The patent applies nested doll by placing the adjustable orifice mechanism inside the pipe structure in a space-efficient manner. The orifice assembly is nested within the pipe wall or positioned in a compact arrangement that minimizes the external footprint while maintaining full functionality.
Solution Approach 2:
The patent implements another dimension by utilizing the radial dimension of the pipe for orifice adjustment rather than requiring additional axial space. The adjustable orifice mechanism operates in the radial direction, allowing control functionality to be integrated into the pipe's cross-sectional area without increasing the pipe's length or external dimensions.
Data Source
AI summary
A variable orifice for a pulverized coal pipe of a pulverizer includes a pipe body connected to and installed on a pipeline of the pulverized coal pipe for supplying a pulverized coal from the pulverizer to a boiler and including a diameter expansion portion having a diameter expanded more than a diameter of the pulverized coal pipe; an opening and closing portion installed inside the diameter expansion portion of the pipe body; a rotation actuating portion configured to rotate the inner opening and closing plate and the outer opening and closing plate in mutually different directions; and an opening and closing plate protection member coupled to an inner circumferential surface of each of the inner opening and closing plate and the outer opening and closing plate.