YONGNING
NEWS CENTER
Biomass Boiler Emission Standards
Release Time:
Sep 08,2020
Control methods and low nitrogen emission technologies for biomass boilers with NOx < 50mg/m. Research has been conducted by relevant departments on the hazards of NOx, the generation mechanism of NOx during coal-fired power generation combustion, and technologies to reduce NOx. Reducing NOx is an inevitable requirement for improving air quality.
NOx control methods can be divided into pre-combustion treatment, treatment during combustion, and post-combustion treatment. Pre-combustion denitrification refers to converting fuel into low-nitrogen fuel, which is technically complex, difficult, and costly, and is therefore still in the research stage; denitrification during combustion mainly includes: first, the formation of NOx during combustion, and second, the reduction of already formed NOx; post-combustion denitrification mainly refers to flue gas denitrification: including selective catalytic reduction, selective non-catalytic reduction, etc.
John's energy-saving boiler structure diagram, the high-temperature gasification boiler uses sealed feeding technology + (water-cooled grate + reciprocating grate technology) + adiabatic combustion technology + high-temperature NOx reduction technology to solve the NOx emission problem.
1. By using the above technologies, the original NOx emissions can generally be controlled to within 200mg/m3, and using urea water reduction can directly achieve below 50mg/m3.
2. Key to controlling NOx emissions: first, control the synthesis of NOx, and second, control the reduction of already formed NOx to N2. The main control of synthesis is to manage the excess air in the combustion chamber; lower excess air results in less NOx formation.
3. Sealed feeding technology, water-cooled grate + reciprocating grate are all aimed at controlling the excess air in the combustion chamber and reducing the damage of high-temperature air to the grate, in order to achieve a lower maintenance rate.
4. Regarding high-temperature air reduction technology for NOx: since the main component of NOx in flue gas is NO, and N2 decomposes into NO at 650℃, the main work of denitrification is to remove NO. NO reacts with reducing gases such as CO, H2, CH4 at temperatures above 850℃ to be reduced to N2.
High-temperature gasification biomass boiler, utilizing high-temperature air combustion technology and adiabatic combustion technology to increase the flue gas temperature. We set up a carbon monoxide generation zone in the combustion chamber, using CO to react with NO, reducing NO to N2, achieving the goal of curbing the generation of nitrogen oxides. John's energy-saving biomass boiler meets the requirements for low carbon and environmental protection.
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