Exhaust Gas Treatment System with CO2 Removal Heating
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Solution Overview
Problem
In conventional exhaust gas treatment systems using amines for CO2 removal, incrustations form inside ducts and flues due to the reaction of amine absorbents with sulfur oxides, leading to black tarry substance formation and increased maintenance labor, especially during reheating.
Innovation Solution
Incorporating a return duct with heating means to vaporize and remove amine absorbent mist before convergence with the main duct, utilizing a heat exchanger for temperature control to ensure a temperature difference of at least 5°C between the treated and untreated exhaust gases, preventing amine sulfate polymerization and incrustation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exhaust gas is treated by CO2 removal device using amine absorbent and then converged with original exhaust gas, then CO2 removal efficiency is improved, but amine sulfate incrustations form in ducts and flues
Solution Approach 1:
The heating means is positioned in the return duct before the convergence point to preemptively vaporize and remove amine absorbent mist before it can react with sulfur oxides and form incrustations. This preliminary action prevents the harmful chemical reaction from occurring in the first place.
Solution Approach 2:
The invention converts the potentially harmful amine absorbent mist into beneficial vaporized amine that can be safely discharged. By heating the mist in the return duct, the harmful liquid/particulate form is transformed into a harmless gaseous form that won't form incrustations.
2Illumination intensity
If exhaust gas is reheated to prevent white smoke discharge, then visibility is improved, but black tarry substance forms requiring extensive cleaning
Solution Approach 1:
The invention extracts and removes the amine absorbent mist from the exhaust gas stream before convergence by using heating means in the return duct. This extraction prevents the formation of black tarry substances during subsequent reheating operations.
Solution Approach 2:
By preliminarily vaporizing and removing amine absorbent mist before the exhaust gas undergoes reheating, the invention prevents the formation of black tarry substances that would otherwise require extensive cleaning operations.
3Ease of operation
If demister is provided at CO2 removal device outlet to remove amine absorbent mist, then mist removal is improved, but complete mist elimination cannot be achieved
Solution Approach 1:
The heating means acts as an intermediary mechanism that takes the amine absorbent mist that escaped the demister and completes the removal process by vaporizing it. This two-stage approach (demister + heating) achieves complete mist elimination.
Solution Approach 2:
The invention continues the mist removal action initiated by the demister by adding heating means in the return duct. This continuous action ensures that even the trace amounts of mist that passed through the demister are completely vaporized and eliminated.
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
Prevents incrustation formation and reduces maintenance labor by ensuring complete vaporization of amine absorbent mist, facilitating long-term operation and efficient CO2 removal in power generation facilities.
Implementation Method 1
heating means configured to vaporize and remove mist of an amine absorbent
Implementation Method 2
the heating means is a heat exchanger
Data Source
AI summary
An object of the present invention is to solve these problems and to provide a exhaust gas treatment system which prevents formation of deposits in a main duct and a flue, on and after the point where the exhaust gases converge, after the removal of CO2 and reduces labor required for maintenance such as cleaning, and thus enabling a long-term operation. Disclosed is an exhaust gas treatment system equipped with a carbon dioxide removal device, comprising a main duct 6 through which an exhaust gas, after treating an exhaust gas from a boiler 1 by a wet desulfurization device, passes; a diverging duct 40 configured to diverge some of an exhaust gas flow from the main duct; an CO2 removal device 20 configured to absorb and remove carbon dioxide (CO2) in the diverged exhaust gas by an amine absorbent; and a return duct 42 configured to converge the exhaust gas, from which CO2 has been removed by the CO2 removal device, with an exhaust gas that has not yet been diverged, wherein the return duct 42, before the point where the exhaust gases converge, is provided with heating means 8 configured to vaporize mist of the amine absorbent in the exhaust gas after convergence.