Electrostatic Separator Shielding Insulator from Particle Contamination
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Solution Overview
Problem
Existing electrostatic precipitators for cleaning flue gases face inefficiencies due to particle re-entrainment and contamination of high-voltage insulators, leading to reduced separation efficiency and increased downtime for maintenance.
Innovation Solution
A shielded high-voltage insulator is created using an electric blocking field formed by a shielding electrode, which reduces particle deposits and voltage flashovers, with an annular gap and radial thickenings enhancing the electric field strength to increase particle deposition on the shielding electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the high-voltage insulator protrudes into the gas-flowing chamber to charge particles, then particle charging efficiency is improved, but the insulator becomes contaminated with particles leading to voltage flashovers
Solution Approach 1:
A shielding electrode is introduced as an intermediary element between the high-voltage insulator and the particle-laden flue gas. This shielding electrode creates an electric barrier field that prevents direct contact between charged particles and the insulator surface, thereby maintaining insulator cleanliness and preventing voltage flashovers while allowing the insulator to continue its particle charging function.
Solution Approach 2:
The shielding electrode establishes a preliminary protective electric field around the high-voltage insulator before particles can reach it. This pre-established barrier field actively repels or captures particles before they can deposit on the insulator surface, preventing contamination and subsequent voltage flashovers.
2Device complexity
If particles are separated in the direction of flue gas flow, then separation process is simplified, but separated particles can be carried along again by gas flow increasing emission levels
Solution Approach 1:
The separator employs multiple separation electrodes arranged at different positions and orientations within the flue gas flow path. Each electrode creates a localized electric field with specific direction and strength, ensuring that particles are captured at different stages of their trajectory and preventing re-entrainment by the gas flow.
3Ease of manufacture
If the electrostatic separator is traversed in the direction of flue gas flow, then installation in flue gas ducts is simplified, but particle separation efficiency is reduced due to re-entrainment
Solution Approach 1:
The separator design incorporates electrodes that create electric fields not only in the flow direction but also in perpendicular dimensions. This multi-dimensional field arrangement ensures particle capture occurs across the entire cross-section of the flue gas flow, preventing particles from escaping downstream and maintaining high separation efficiency.
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 configuration enhances flue gas cleaning efficiency and extends maintenance intervals by minimizing particle contamination on the insulator, reducing voltage flashovers and maintaining high separation efficiency.
Implementation Method 1
The particles contained in the flue gas are electrically charged at the high-voltage electrode via corona discharge
Implementation Method 2
As the flue gas continues to flow through the electric field, a force is exerted on the particles contained in the flue gas (electric charge carriers), causing the electric charge carriers to be deposited on the inner wall of the shielding electrode
Data Source
Figure 1
AI summary
The separator has a high voltage electrode (6) electrically charging particles by a high voltage power supply. A high-voltage insulator (4) is connected between the power supply and a separator chamber (1). A tubular shielding electrode (11) is arranged around the high voltage electrode. The voltage electrode has a blocking field electrode (12) for producing an electrical blocking field in an annular gap between the voltage electrode and the field electrode. The blocking field is formed between an inlet opening (3) and the insulator. The insulator is shielded from the waste gas by the field.