Catalyst Bag Filtration Before CO2 Absorption to Protect Amines
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Solution Overview
Problem
Existing CO2 absorption pretreatment devices for exhaust gas require high installation and operation costs, and the removal of substances that alter amine compounds is often insufficient, leading to deterioration of CO2 absorbent liquid performance.
Innovation Solution
An exhaust gas purification method involving a catalyst bag filter with denitration, NO oxidation, Hg0 oxidation, and desulfurization functions, followed by cooling and direct contact with a CO2 absorbent liquid to remove harmful substances before CO2 absorption, using a sequence of devices including a catalyst bag filter, gas cooling device, and CO2 absorption device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a CO2 absorption pretreatment device is provided to remove substances that alter amine compounds, then the CO2 absorption performance is maintained, but the installation and operation costs increase significantly
Solution Approach 1:
The patent combines multiple purification functions (denitration, dust collection, desulfurization, dehydrochlorination) into a single integrated catalyst bag filter system. This merging of functions eliminates the need for separate pretreatment devices, thereby maintaining CO2 absorption performance while significantly reducing installation and operation costs.
Solution Approach 2:
The catalyst bag filter is designed to perform multiple functions simultaneously: removing soot dust, nitrogen oxides, sulfur oxides, hydrogen chloride, and other substances that alter amine compounds. This multi-functionality ensures comprehensive protection of CO2 absorbent liquid while avoiding the need for multiple specialized devices.
2Object-generated harmful factors
If conventional pretreatment devices are used to remove harmful substances, then some purification is achieved, but the removal of substances that alter amine compounds is insufficient, leading to deterioration of CO2 absorbent liquid
Solution Approach 1:
The catalyst bag filter employs different catalytic materials in different regions or layers to target specific harmful substances. For example, certain catalysts are positioned to specifically address nitrogen oxides, while others target sulfur oxides or mercury, ensuring thorough removal of all substances that would otherwise alter and deteriorate the amine compounds in the CO2 absorbent liquid.
Solution Approach 2:
The filter system uses composite catalytic materials that combine multiple active components capable of simultaneously or sequentially removing different types of harmful substances. This composite approach ensures comprehensive purification, preventing any single type of contaminant from compromising the CO2 absorbent liquid performance.
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
Efficiently removes harmful substances like nitrogen dioxide, nitrogen monoxide, sulfur oxides, and mercury, extending the lifetime of the CO2 absorbent liquid and reducing costs by minimizing deterioration, while maintaining effective CO2 absorption performance.
Implementation Method 1
allowing exhaust gas containing at least one selected from the group consisting of soot dust, hydrogen chloride, nitrogen oxides, sulfur oxides, mercury, volatile organic compounds, and carbon oxides to pass through a catalyst bag filter which has at least one function selected from the group consisting of a denitration function, an NO oxidization function, an Hg0 oxidization function, and a desulfurization function
Implementation Method 2
cooling the exhaust gas that has passed through the catalyst bag filter
Implementation Method 3
allowing the exhaust gas to directly contact a CO2 absorbent liquid to remove carbon dioxide from the exhaust gas
Data Source
Figure 1
AI summary
An exhaust gas purification method includes: allowing exhaust gas containing at least one selected from the group consisting of soot dust, hydrogen chloride, nitrogen oxides, sulfur oxides, mercury, volatile organic compounds, and carbon oxides to pass through a catalyst bag filter which has at least one function selected from the group consisting of a denitration function, an NO oxidization function, an Hg0 oxidization function, a desulfurization function, and an adsorption function; bringing the exhaust gas after passing through the catalyst bag filter into direct contact with a cooling liquid to decrease a temperature of the exhaust gas; and bringing the exhaust gas after directly contacting the cooling liquid into direct contact with a CO2 absorbent liquid to reduce carbon dioxide in the exhaust gas.