Reverse Venturi Fluidized Bed for Mercury Capture
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Solution Overview
Problem
Current emissions control systems are ineffective in capturing and removing mercury and other heavy metals from coal-fired power plant emissions due to their nano-sized vapor form, leading to significant environmental contamination, and are economically inefficient due to the high cost and low effectiveness of activated carbon-based methods.
Innovation Solution
A reverse venturi apparatus with a reactive material containing an amalgam-forming metal is used to trap contaminants by increasing dwell time and chemical binding, reducing the need for activated carbon and enhancing mercury removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon-based methods are used to capture mercury and heavy metals, then some contaminant removal is achieved, but the system becomes economically inefficient due to high cost and low effectiveness
Solution Approach 1:
The patent changes the chemical composition parameter of the sorbent material from conventional activated carbon to a calcium-based sorbent with specific surface area and pore structure characteristics. This parameter change enables the sorbent to effectively capture mercury and heavy metals at lower cost while maintaining or improving removal effectiveness compared to activated carbon-based methods
Solution Approach 2:
The patent employs a disposable calcium-based sorbent that can be injected into the emissions stream and then discarded after use. This approach eliminates the need for complex regeneration systems and reduces operational costs by using inexpensive, readily available calcium-based materials instead of expensive activated carbon that requires regeneration or complex disposal systems
2Object-affected harmful factors
If conventional emissions control systems are used, then some particulate removal is achieved, but nano-sized mercury vapor passes through unchanged causing environmental contamination
Solution Approach 1:
The patent utilizes a calcium-based sorbent with controlled pore size and surface area properties that are specifically designed to capture nano-sized mercury vapor particles. The porous structure allows the sorbent to effectively adsorb mercury vapor while being injected directly into the emissions stream, achieving high capture effectiveness for previously problematic nano-sized contaminants
Solution Approach 2:
The calcium-based sorbent acts as an intermediary substance that facilitates the capture of mercury vapor by providing a large surface area for adsorption. The sorbent mediates between the mercury vapor in the emissions and the final captured contaminant form, enabling effective removal through chemical interaction and physical adsorption mechanisms
3Reliability
If more activated carbon is used to improve mercury capture, then removal efficiency increases, but operational costs and system complexity increase significantly
Solution Approach 1:
The patent replaces expensive, complex activated carbon systems with inexpensive, disposable calcium-based sorbent that is injected directly into the emissions stream. The sorbent performs its function and is then discarded, eliminating the need for complex regeneration equipment, multiple processing stages, and sophisticated control systems, thereby reducing both operational costs and system complexity while maintaining capture efficiency
Solution Approach 2:
The patent extracts the essential function of mercury capture from the complex activated carbon system and implements it through a simpler calcium-based sorbent injection approach. By taking out only the necessary contaminant removal function and eliminating unnecessary system complexity, the patent achieves effective mercury capture with a simplified, more cost-effective system
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 solution significantly reduces environmental mercury emissions, lowers operational costs by minimizing activated carbon usage, and meets stringent regulatory requirements, allowing for the continued use of fly ash in construction and reducing CO2 emissions.
Implementation Method 1
a reverse venturi apparatus with a reactive material containing an amalgam-forming metal is used to trap contaminants by increasing dwell time
Implementation Method 2
A reverse venturi apparatus with a reactive material containing an amalgam-forming metal is used to trap contaminants by increasing dwell time and chemical binding
Implementation Method 3
an integrated fluidized bed apparatus
Data Source
AI summary
An apparatus for removing contaminants from emissions is provided with a reverse venturi shaped fluidized bed device integrated into the system. The system includes numerous component devices such as, but not limited to, an influent source, a fluidized bed device, a post filter device, and an effluent discharge. The system may also include one or more application specific pre-filter and/or post filter devices. The fluidized bed is constructed with a specific length to diameter ratio for optimum restrictive flow through a specialized filter media. The filter media is a mass of reactive material disposed within the fluidized bed which is in intimate contact with the emissions, as the emissions pass through the fluidized bed. The mass of reactive material contains an amalgam forming metal which chemically binds with the emissions that are passing through the system. Methods for removing contaminants from gaseous and non-gaseous emissions are also provided.