Premixed Boiler Burner Layout for Ultra-Low NOx and CO
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Solution Overview
Problem
Conventional techniques find it difficult to achieve significant reductions in NOx, CO, and O2 levels in boiler exhaust gases while also ensuring energy efficiency, particularly in achieving residual oxygen levels of 3% or less, NOx levels of 20 ppm or less, and CO levels of 50 ppm or less.
Innovation Solution
A boiler design incorporating a premixed gas burner that ejects premixed gas at a predetermined angle towards water tubes, with a fuel supply portion downstream to facilitate multi-stage fuel combustion, maintaining an air ratio between 1.3 and 2.0, and supplying fuel to a temperature range of 800°C to 1200°C to suppress NOx generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional combustion techniques are used, then boiler operation is simple, but NOx, CO, and O2 reduction targets cannot be achieved
Solution Approach 1:
The combustion process is divided into multiple stages: a first fuel supply portion supplies fuel at a lower position, and a second fuel supply portion supplies fuel at a higher position downstream. This segmentation allows different zones to operate under different combustion conditions, enabling simultaneous reduction of NOx (through controlled temperature zones) and CO (through extended combustion time), while maintaining manageable system complexity through modular fuel injection points
Solution Approach 2:
The invention transitions from conventional single-point or single-zone combustion to a multi-dimensional combustion approach by positioning fuel supply portions at different vertical heights and downstream distances. The first fuel supply is positioned lower and closer to the burner, while the second fuel supply is positioned higher and further downstream, creating a three-dimensional combustion zone structure that addresses multiple emission concerns simultaneously
2Object-affected harmful factors
If multi-stage fuel supply is implemented, then emission reduction is achieved, but device complexity increases
Solution Approach 1:
The fuel supply system is segmented into two independent but coordinated injection points: the first fuel supply portion positioned downstream by a first distance, and the second fuel supply portion positioned downstream by a second distance greater than the first. This segmentation enables emission control through distributed fuel injection while maintaining relatively simple system architecture through straightforward positioning and control
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 effectively reduces NOx, CO, and O2 levels in boiler exhaust gases, achieving ultra-low emissions and energy savings by maintaining a stable combustion state and promoting oxidative combustion, thereby enhancing boiler efficiency and reducing size.
Implementation Method 1
water tubes in close proximity to the premixed gas burner... the premixed gas burner ejects a premixed gas toward the water tubes
Implementation Method 2
combustion reaction promoting region for promoting combustion reaction
Implementation Method 3
promoting oxidative combustion
Data Source
AI summary
To provide a boiler capable of realizing a reduction in O2, a reduction in NOx, and a reduction in CO. The present invention provides a boiler including: a premixed gas burner, and water tubes in close proximity to the premixed gas burner, characterized in that the premixed gas burner ejects a premixed gas toward the water tubes at a predetermined angle; and the boiler further includes a fuel supply portion capable of supplying at least one of a gas fuel and a premixed gas provided at a position on a downstream side of and spaced apart by a predetermined distance from the premixed gas burner.