Air Pollution Control Unit with Co-Current Gas Washing
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Solution Overview
Problem
Existing air pollution control systems face inefficiencies in particle collection, leading to fouling and clogging issues due to low particle collection efficiency, and require excessive makeup water, particularly in countercurrent gas-liquid contact systems.
Innovation Solution
An air pollution control unit with a gas washing column for co-current gas-liquid contact and a gas cooling column in countercurrent contact, utilizing a sloped plate to enhance gas flow regulation and a condensed water transfer line to reduce makeup water needs, along with a basic compound for desulfurization if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If countercurrent gas-liquid contact system is used, then gas cleaning is performed, but particle collection efficiency is insufficient
Solution Approach 1:
The gas treatment system is divided into two separate columns: a gas washing column for particle removal and a gas cooling column for cooling and condensation. This segmentation allows each column to be optimized for its specific function, with the gas washing column achieving high particle collection efficiency through co-current contact and the gas cooling column handling thermal processing, thereby resolving the contradiction between reliable particle collection and productive gas cleaning.
Solution Approach 2:
The patent inverts the conventional countercurrent contact approach by implementing co-current gas-liquid contact in the gas washing column. This inversion allows both gas and liquid to flow in the same direction, creating a more effective particle collection mechanism where particles are captured throughout the entire contact path rather than only at the interface, thus improving particle collection efficiency without compromising gas cleaning performance.
2Reliability
If co-current gas-liquid contact followed by countercurrent gas-liquid contact is used, then gas treatment is enhanced, but large supply of makeup water is required
Solution Approach 1:
The patent recovers condensed water from the gas cooling column and returns it to the gas washing column as makeup water. This water recovery mechanism reduces the quantity of fresh makeup water required while maintaining the particle collection efficiency achieved through co-current contact, thereby resolving the contradiction between reliable particle collection and reduced water consumption.
Solution Approach 2:
The condensed water from the gas cooling column serves multiple functions: it acts as makeup water for the gas washing column and is recycled through the system. This multi-functionality reduces the overall water demand of the system while maintaining effective particle collection, addressing the contradiction between particle collection efficiency and makeup water quantity.
3Device complexity
If particle collection efficiency is low, then gas treatment is simpler, but particles attach to apparatus causing fouling and clogging
Solution Approach 1:
By segmenting the gas treatment into a dedicated gas washing column for particle removal followed by a gas cooling column, the system achieves high particle collection efficiency without excessive complexity. The separation of functions allows each column to be optimized for its specific task, preventing fouling and clogging while maintaining manageable system complexity.
Solution Approach 2:
The gas washing column performs preliminary particle removal before the gas enters the gas cooling column. This preliminary action prevents particles from reaching downstream equipment, thereby maintaining apparatus operability and preventing fouling and clogging without requiring complex treatment systems throughout the entire gas path.
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 achieves enhanced particle collection efficiency, reduces fouling and clogging risks, and minimizes the requirement for makeup water by optimizing gas flow and utilizing recycled condensed water.
Implementation Method 1
a gas washing column having a gas cleaning section in which the particle-containing gas and the washing liquid are brought into co-current contact with each other
Implementation Method 2
a gas cooling column which is disposed downstream of the gas washing column along a gas flow and in which the particle-containing gas that has been cleaned and cooling liquid are brought into countercurrent contact with each other
Implementation Method 3
a condensed water reservoir section in which condensed water that has been condensed from the cleaned gas is reserved
Implementation Method 4
a sloped plate which is disposed at a connection opening of the gas communication path on the gas washing column side and regulates the gas flow
Implementation Method 5
a washing liquid circulation line through which the washing liquid from the washing liquid reservoir section is circulated to a top side of the gas washing column
Implementation Method 6
a condensed water transfer line through which the condensed water from the gas cooling column is transferred to the gas washing column
Implementation Method 7
a cooling device which is interposed in the condensed water circulation line and cools the condensed water
Data Source
AI summary
An air pollution control unit is configured to bring particle-containing gas and washing liquid into contact with each other to collect particles in the particle-containing gas. The air pollution control unit includes a gas washing column having a gas cleaning section in which the particle-containing gas and the washing liquid are brought into co-current contact with each other, a gas cooling column disposed downstream of the gas washing column along the gas flow and having a gas cooling section in which the particle-containing gas that has been cleaned (cleaned gas) and cooling liquid are brought into countercurrent contact with each other, and a gas communication path.