WESP Gas Inlet Liquid Sealing for Offline Module Cleaning
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Solution Overview
Problem
Maintenance issues in wet electrostatic precipitators (WESP) arise due to sticky particulate build-up, which requires manual intervention and reduces efficiency, as conventional scrubbing water decreases electric field strength and is ineffective in removing all particles.
Innovation Solution
A method and apparatus for cleaning WESP internals using a sealing liquid to submerge gas inlets, stopping gas flow and allowing for modular offline cleaning, with a volume reducer and anti-wave baffles to manage liquid and prevent wave formation, enabling efficient and cost-effective removal of particulate matter without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scrubbing water flow is used to wash collection electrode surfaces, then particle removal is improved, but electric field strength decreases due to high conductivity of water
Solution Approach 1:
The precipitator is divided into multiple modules that can be operated independently. Each module can be taken offline for cleaning while others continue operating, allowing thorough cleaning without compromising overall system performance and electric field strength
Solution Approach 2:
The system implements periodic flushing cycles where sealing liquid is introduced to flood the chamber and shut off gas flow temporarily. This periodic action allows effective particle removal while maintaining electric field strength during normal operation periods
2Reliability
If manual cleaning intervention is implemented, then particle build-up is removed, but downtime increases and operational cost increases
Solution Approach 1:
The system implements self-cleaning capabilities through automated periodic flushing cycles. The sealing liquid automatically floods the chamber to remove particle build-up without requiring manual intervention, reducing both downtime and operational costs
Solution Approach 2:
The system performs preliminary cleaning actions during scheduled maintenance windows by flooding the chamber with sealing liquid. This prevents excessive particle accumulation that would require extended manual cleaning periods
3Ease of operation
If sealing liquid is introduced to submerge gas inlet and stop gas flow, then module isolation for cleaning is achieved, but liquid management complexity increases
Solution Approach 1:
The system extracts the gas flow control function from mechanical dampers or valves and replaces it with a liquid seal mechanism. The sealing liquid directly blocks the gas inlet, simplifying the isolation mechanism while enabling effective module shutdown for cleaning
Solution Approach 2:
The system uses hydraulic principles by introducing sealing liquid to create a physical barrier that stops gas flow. This hydraulic approach replaces complex pneumatic or mechanical flow control systems with a simpler liquid-based isolation mechanism
4Stability of the object's composition
If volume reducer and anti-wave baffles are added to manage sealing liquid, then wave formation is prevented, but device complexity increases
Solution Approach 1:
The volume reducer employs curved or barrel-shaped surfaces to guide liquid flow smoothly into the chamber. This curvature prevents abrupt flow changes that would generate waves, while the streamlined shape minimizes structural 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 approach allows for efficient and cost-effective cleaning of WESP internals by isolating modules for offline cleaning, minimizing manual intervention, and maintaining high particulate removal efficiency while preventing mist carryover and reducing downtime.
Implementation Method 1
introducing a sealing liquid into the chamber in an amount sufficient to submerge the at least one inlet and stop the flow of process gas into the chamber
Implementation Method 2
the particulate matter and/or mist is electrically charged by corona emitted from the high voltage discharge electrodes
Implementation Method 3
the charged particulate matter and/or mist is electrostatically attracted to grounded collecting plates or electrodes
Implementation Method 4
electrically charged by corona emitted from the high voltage discharge electrodes
Data Source
AI summary
Method and apparatus for cleaning pollution control equipment, such as particulate removal devices, including wet electrostatic precipitators (WESP). The apparatus may include a housing having a chamber, at least one process gas inlet in fluid communication with the chamber, a process gas outlet spaced from the at least one process gas inlet and in fluid communication with the chamber, one or more ionizing electrodes in the housing and one or more collection electrodes or plates in the housing. Sealing liquid is provided and introduced into the chamber in an amount sufficient to submerge the at least one process gas inlet and stop the flow of contaminated gas into the chamber.