Two-Stage NOx Reduction in Regenerative Thermal Oxidation
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Solution Overview
Problem
Regenerative thermal oxidation devices generate significant amounts of nitrogen oxides due to high-temperature combustion, which are difficult to effectively reduce using existing methods, especially in industrial furnaces where high temperatures increase NOx production.
Innovation Solution
A nitrogen oxide reduction system combining a selective non-catalytic reduction method for primary reduction and a selective catalytic reduction method for secondary reduction, utilizing a temperature control system and emission control to optimize NOx removal from exhaust gases, with a two-stage reduction process involving a first reduction device and a second catalytic reduction device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature combustion is used in regenerative thermal oxidation device, then VOC oxidation efficiency is improved, but nitrogen oxide generation increases
Solution Approach 1:
The system divides the exhaust gas treatment into multiple stages: primary treatment in the RTO device for VOC oxidation, followed by secondary NOx reduction stages. This segmentation allows each stage to optimize for its specific function without compromising the other.
Solution Approach 2:
A reduction agent (such as ammonia or urea) is introduced as an intermediary substance that reacts with nitrogen oxides to convert them into harmless nitrogen and water vapor, thereby reducing the harmful effects of high-temperature combustion.
2Device complexity
If single-stage reduction method is used, then device complexity is reduced, but nitrogen oxide removal efficiency is insufficient
Solution Approach 1:
The reduction process is divided into multiple stages with different reduction methods (non-catalytic and catalytic) to achieve better overall NOx removal efficiency while managing system complexity through modular design.
Solution Approach 2:
The system changes operational parameters such as temperature, pressure, and reduction agent injection timing across different stages to optimize NOx removal efficiency at each phase of the treatment process.
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 significantly improves the efficiency of nitrogen oxide reduction, achieving high removal rates of NOx by leveraging both non-catalytic and catalytic reduction methods to control and manage exhaust gas temperatures and discharge rates effectively.
Implementation Method 1
a first reduction device for primarily reducing nitrogen oxides generated by a regenerative thermal oxidation device based on a selective non-catalytic reduction method
Implementation Method 2
a second reduction device for secondarily reducing nitrogen oxides based on a selective catalytic reduction method for an exhaust gas stored in the exhaust gas storage device
Implementation Method 3
a regenerative thermal oxidation (RTO) device that stores heat of exhaust gas by direct contact and reuses the stored heat
Implementation Method 4
recovering up to 95% using a ceramic heat storage agent, not a general heat exchanger such as a fin-tube or a plate type, and by using it to preheat the process exhaust gas
Implementation Method 5
the organic gas contained in the gas starts to be oxidized and passes through the upper chamber having an appropriate residence time, and all organic matters are oxidized
Data Source
AI summary
A nitrogen oxide reduction type regenerative thermal oxidation system and a method for nitrogen oxide reduction thereof are disclosed. The nitrogen oxide reduction type regenerative thermal oxidation system according to the present invention is characterized by comprising: a first reduction device for primarily reducing nitrogen oxides generated by a regenerative thermal oxidation device based on a selective non-catalytic reduction method; an exhaust gas storage device for storing the exhaust gas being discharged from the regenerative thermal oxidation device; a second reduction device for secondarily reducing nitrogen oxides based on a selective catalytic reduction method for an exhaust gas stored in the exhaust gas storage device; and a suction and discharge device for sucking in the exhaust gas with secondarily reduced nitrogen oxides from the exhaust gas storage device and discharging it into the atmosphere.