Dust Separator for High Dust Load Flue Gas
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Solution Overview
Problem
Current dry flue gas desulfurization systems face challenges in efficiently removing sulfur dioxide and particulate pollutants under high dust load conditions while minimizing equipment wear and space requirements, and existing technologies often have high capital investment and operational costs.
Innovation Solution
A dust separator system integrated with a dry scrubber reactor and a fabric filter, utilizing a moistened reducing agent like calcium oxide or calcium hydroxide, which disperses the agent into the flue gas to react with pollutants, capturing particulate matter with a dust separator and additional particulate removal in a fabric filter, thereby reducing equipment wear and space needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a dry scrubber system is used to treat flue gas with high dust load, then capital investment and operating costs are reduced compared to wet systems, but equipment wear increases and space requirements are limited
Solution Approach 1:
A dust separator is introduced as an intermediary device between the dry scrubber reactor and the fabric filter. This separator removes a portion of the dust load before the gas stream enters the fabric filter, thereby protecting the fabric filter from excessive wear and extending its operational life while maintaining the cost advantages of dry scrubbing systems
Solution Approach 2:
The particulate removal function is segmented into two stages: first, a dust separator removes the bulk of the dust load from the high dust load gas stream, and second, a fabric filter captures remaining fine particulates. This segmentation allows each component to be optimized for its specific function, reducing overall equipment wear while maintaining effective pollution control
2Reliability
If a dust separator is added to the dry scrubber system to reduce equipment wear, then equipment wear is reduced, but device complexity increases
Solution Approach 1:
The dust separator is designed as a standalone, modular unit that can be extracted and removed from the gas stream without affecting the core dry scrubber reactor or fabric filter operations. This modular approach allows for easy maintenance, replacement, and optimization of the dust separator independently, thereby managing system complexity while providing effective protection against equipment wear
3Manufacturing precision
If a fabric filter is used for additional particulate removal, then particulate matter removal efficiency is improved, but space requirements increase
Solution Approach 1:
The dust separator utilizes a vertical or compact horizontal arrangement that efficiently utilizes available space by directing the gas stream through a optimized flow path. This dimensional optimization allows the fabric filter to achieve high particulate removal efficiency without requiring excessive floor space, making the system suitable for facilities with limited available area
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 effectively meets or exceeds regulatory emissions standards with reduced equipment wear and space requirements, lowering capital investment and operational costs compared to wet systems, while efficiently removing sulfur dioxide and particulate pollutants from high dust load flue gas.
Implementation Method 1
hydrated lime is placed in contact with the flue gas to convert the gaseous pollutants to a separable dust
Implementation Method 2
particulate matter is removed from the relatively high dust load flue gas
Implementation Method 3
dust separator for removal of particulate matter from the relatively high dust load flue gas
Implementation Method 4
dust separator captures combustion particulates and particulate by-product
Implementation Method 5
FF system for additional removal of particulate matter from the flue gas
Data Source
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AI summary
An air quality control system (AQCS) 14 useful for treating flue gas FG, such as flue gas FG produced by a fossil fuel fired boiler 12 is described. The AQCS 14 is equipped with a dust separator 37. The dust separator 37 is useful under relatively high dust load conditions downstream from a dry scrubber reactor 36 with limited equipment wear and limited space requirements. As such, the dust separator captures particulate matter with a dust trap that intercepts the flow of particulate matter for collection of the particulate matter in a hopper.