Alkalinity Agent Supply in Compressor Gas Separation to Prevent Corrosion
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Solution Overview
Problem
Conventional exhaust gas treatment systems for oxyfuel combustors are costly and complex due to the large size and high installation costs of equipment needed to remove impurities, particularly sulfur oxides, which can corrode compressors and reduce the purity of carbon dioxide, necessitating the development of a more efficient and cost-effective method for impurity removal.
Innovation Solution
A compressor-based impurity separation mechanism that uses a refrigerator-type heat exchanger and an alkalinity control agent supply system to remove impurities from exhaust gas before liquefaction, employing a series of compressors and aftercoolers to stepwise compress and cool the gas, with an alkalinity control agent being supplied upstream of the aftercooler to enhance impurity removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wet desulfurizer equipment is used to remove sulfur oxides, then impurity removal effectiveness is improved, but equipment size and installation cost increase
Solution Approach 1:
The invention extracts the essential function of wet desulfurization from complex conventional equipment and implements it through a simplified system consisting of a compressor, aftercooler, and alkalinity control agent supply mechanism. This extraction approach maintains effective sulfur oxide removal while eliminating unnecessary equipment complexity and reducing installation costs.
Solution Approach 2:
The invention changes the operational parameters by controlling alkalinity through pH measurement and automated agent supply. By monitoring pH levels and dynamically adjusting alkalinity control agent dosage, the system maintains optimal impurity removal effectiveness without requiring large-scale conventional desulfurization equipment.
2Device complexity
If sulfur oxides are not removed, then equipment complexity is reduced, but compressor corrosion occurs
Solution Approach 1:
The invention applies preliminary action by supplying alkalinity control agents before the exhaust gas reaches the compressor. The aftercooler and agent supply mechanism treat the gas in advance, neutralizing sulfur oxides and preventing corrosion before the gas enters the compressor, thereby protecting equipment while maintaining system simplicity.
Solution Approach 2:
The invention introduces an intermediary substance (alkalinity control agent) that mediates between the harmful sulfur oxides and the compressor. This agent neutralizes the corrosive components in the exhaust gas, allowing the gas to pass through the compressor without causing corrosion, thus protecting the equipment while maintaining operational simplicity.
3Quantity of substance
If impurities are not removed, then treatment cost is reduced, but carbon dioxide purity decreases
Solution Approach 1:
The invention implements self-service by using an automated control system that monitors pH levels and automatically supplies alkalinity control agents as needed. This self-regulating mechanism maintains high carbon dioxide purity through continuous impurity removal without requiring complex manual intervention or oversized equipment, achieving both purity and simplicity.
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 approach allows for effective removal of impurities at a low cost using simple equipment, preventing compressor corrosion and maintaining carbon dioxide purity, thereby reducing equipment size and installation costs.
Implementation Method 1
aftercoolers for cooling the exhaust gas compressed by the respective compressors through heat exchange with water
Implementation Method 2
water condensed by the cooling being discharged as drain
Implementation Method 3
supplying of an alkalinity control agent... to enhance impurity removal performance
Implementation Method 4
a plurality of compressors for stepwisely compressing carbon dioxide up to a target pressure for liquefaction
Implementation Method 5
aftercoolers for cooling the exhaust gas compressed by the respective compressors through heat exchange with water
Data Source
AI summary
Exhaust gas from which impurities have been removed through pressurization and cooling by a compressor-based impurity separation mechanism is further cooled by a refrigerator-type heat exchanger. Drain produced from the cooling by the refrigerator-type heat exchanger is discharged and supplied as an alkalinity control agent to at least upstream of an aftercooler in a first impurity separator.