Condenser with Segmented Packed Beds for Flue Gas Cleaning
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Solution Overview
Problem
Current condensers used in flue gas treatment are inefficient in recovering heat and cooling flue gases due to the requirement of minimizing temperature differences between flue gases and condensate, which limits heat transfer and requires high packing bed areas, and they fail to effectively remove corrosives like sulfur dioxide, leading to corrosion risks and energy losses.
Innovation Solution
A condenser design with two packed beds and separate condensate loops, where heat exchangers are used to maximize heat recovery and cooling, and anti-corrosive reagents like sodium hydroxide are injected into the condensate flow to remove corrosives, maintaining optimal temperature differences and reducing corrosive concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a packed bed condenser is used to cool flue gases, then heat recovery efficiency is improved, but the temperature difference between flue gas and condensate must be minimized (not more than 4°C), which limits the cooling effectiveness and requires larger packing bed area
Solution Approach 1:
The condenser is divided into multiple packed beds arranged in series, with each packed bed handling a specific stage of cooling. This segmentation allows the system to manage temperature differences more effectively across multiple zones while maintaining high heat recovery efficiency in each zone.
Solution Approach 2:
The patent introduces a vertical dimension to heat transfer by arranging packed beds at different elevations with condensate flowing downward through gravity while flue gas rises upward. This counter-current flow arrangement in the vertical dimension enhances heat exchange efficiency without requiring excessive horizontal space.
2Temperature
If the liquid load through the packed bed element is reduced to minimize temperature difference, then the temperature difference requirement is met, but the efficiency of heat transfer from flue stream to condensate flow is reduced and cooling of the flue stream is reduced
Solution Approach 1:
Multiple packed beds are arranged in series to distribute the cooling load across several stages. Each packed bed operates with optimized liquid load to maintain temperature difference control while collectively achieving high cooling efficiency through the cumulative effect of multiple stages.
Solution Approach 2:
The system maintains continuous cooling action through multiple packed beds where condensate flows continuously from one bed to the next. This continuous multi-stage process ensures that cooling efficiency is maintained throughout the entire flue gas treatment process without interruption or loss of effectiveness.
3Quantity of substance
If a high tower is required to sufficiently condense H2O to meet temperature difference requirements, then condensation is achieved, but the cooling of the flue gas is sacrificed
Solution Approach 1:
The condensation process is segmented into multiple packed beds, each contributing to water removal while maintaining temperature control. This segmentation allows sufficient H2O condensation to occur across the series of beds without requiring a single excessively tall structure that would compromise cooling effectiveness.
Solution Approach 2:
The patent utilizes vertical stacking of packed beds to achieve sufficient condensation in a compact footprint. By arranging beds vertically with optimized flow patterns, the system achieves thorough water condensation while maintaining effective flue gas cooling through the counter-current flow mechanism.
4Reliability
If conventional condensers are used, then flue gases are cooled and condensed, but corrosives such as sulfur dioxide are not removed, leading to corrosion risks in downstream equipment
Solution Approach 1:
A reagent injection system introduces chemical reagents into the condensate stream to neutralize corrosives like sulfur dioxide. This intermediary chemical treatment removes harmful substances from the flue gas before it reaches downstream equipment, providing corrosion protection without requiring fundamental changes to the condenser structure.
Solution Approach 2:
The system changes the chemical parameters of the condensate by injecting reagents that alter its composition and reactivity. This parameter change enables the condensate to neutralize and remove corrosives from the flue gas, transforming the condensate from a potential corrosion vector into a protective cleaning medium.
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 design enhances heat recovery and cooling efficiency, maintaining temperature differences below 4°C and reducing sulfur dioxide concentrations to less than 1 ppmv, effectively addressing energy losses and corrosion risks.
Implementation Method 1
A first heat exchanger is configured to receive condensate flow from the first packed bed. A second heat exchanger is configured to receive condensate flow at least in part from the second packed bed.
Implementation Method 2
Before a flue stream may be processed in a GPU, H2O, which is gaseous as it exits a fuel reactor in a flue stream, is generally condensed out of the flue stream
Implementation Method 3
external heat exchangers may be incorporated for recovery of heat from the flue gases and to assist in cooling of flue gases
Implementation Method 4
Anti-corrosive reagents are injected into condensate flows via at least the first valve
Data Source
AI summary
An apparatus and method to clean flue gases. As shown in FIG. 1, a condenser 10 is provided having two packed beds (20/26) and two condensate loops. The condensate loops are configured such that anti-corrosive agent (40/41) may injected. Corrosives are removed from flue gases as condensate containing anti-corrosive agents passes over the flue gases.