Electrostatic Droplet Agglomeration for Fine Particle Collection
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Solution Overview
Problem
Existing dust collection systems are inefficient in collecting fine particles from exhaust gases, particularly in power plants and waste treatment facilities.
Innovation Solution
A dust collection system comprising a circulation passage with a droplet supply unit, an electrostatic flocculation unit, and an electric dust collector, where droplets are supplied downstream, charged, and collide with fine particles to facilitate collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is sprayed into exhaust gas to adhere to fine particles, then fine particles can be collected by electric dust collector, but collection efficiency is insufficient
Solution Approach 1:
The patent introduces droplets as an intermediary substance between the fine particles and the electric dust collector. The droplets are sprayed into the exhaust gas flow, adhere to the fine particles through collision and surface tension, and transport the particles to the collection electrode. This intermediary mechanism enhances collection efficiency by providing a larger surface area for particle capture and facilitating particle-droplet coagulation before electrostatic precipitation.
Solution Approach 2:
The patent changes the physical parameters of the exhaust gas by introducing liquid droplets, which alter the density, viscosity, and electrical conductivity of the gas phase. These parameter changes enhance the interaction between particles and the electric field, improving collection efficiency. The droplet size, spray rate, and distribution are optimized to maximize particle capture while maintaining flow characteristics.
2Productivity
If traditional spray method is used upstream of electric dust collector, then some fine particles are collected, but more efficient collection is required
Solution Approach 1:
The patent merges the spray injection function with the electrostatic precipitation function into an integrated system. The droplet supply unit is positioned to work in conjunction with the electric dust collector, creating a combined wet-electric precipitation system. This merging allows the droplets and electric field to work synergistically, where droplets facilitate particle capture and the electric field provides the driving force for collection, achieving higher efficiency without proportionally increasing system 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
The system efficiently collects fine particles by enhancing their adhesion to droplets, allowing for more effective removal and reducing the size of the electric dust collector.
Implementation Method 1
an electrostatic flocculation unit that is disposed in the circulation passage on a downstream side from a supply position of the droplets, forms an electric field in a flow path of the gas, and charges fine particles contained in the gas and the droplets to collide (flocculate) with each other
Implementation Method 2
a dust collection unit that is disposed in the circulation passage on a downstream side from the electrostatic flocculation unit and collects the droplets and the fine particles
Data Source
AI summary
Provided are a dust collection system and a dust collection method that make it possible to efficiently collect fine particles included in a gas. The dust collection system includes: a flow path route through which a gas flows; a droplet supply section for supplying droplets to the flow path route; an electrostatic agglomeration unit that is arranged in the flow path route downstream from the position at which droplets are supplied, forms an electric field in the flow path of the gas, electrostatically charges the droplets and fine particles included in the gas, and causes the fine particles and the droplets to collide (agglomerate); and a dust collection section t is arranged in the flow path route downstream from the electrostatic agglomeration unit and collects the droplets and fine particles.