Compared with traditional coal-fired hot air furnaces, what technical advantages does the biomass pellet hot air furnace have in reducing nitrogen oxide emissions?
Publish Time: 2025-01-21
Compared with traditional coal-fired hot air furnaces, the biomass pellet hot air furnace has significant technical advantages in reducing nitrogen oxide (NOx) emissions.1. Fuel characteristicsBiomass pellet fuel: Biomass pellet fuel is mainly derived from plant materials, such as wood chips, straw, rice husks, etc. These fuels usually have a low nitrogen content and produce relatively few nitrogen oxides during combustion.Low nitrogen combustion: The combustion characteristics of biomass pellet fuel make it produce low nitrogen oxide emissions when burned under appropriate conditions. NOx generation can be further reduced by controlling the combustion temperature and oxygen supply.2. Combustion technologyLow oxygen combustion: The biomass pellet hot air furnace adopts low oxygen combustion technology, which allows the combustion process to be carried out at a lower excess air coefficient by precisely controlling the oxygen concentration in the combustion chamber. This can suppress the generation of thermal NOx, because high temperature and excess oxygen are the main factors in NOx generation.Staged combustion: The staged combustion technology is used to divide the combustion process into multiple stages, and different combustion conditions are controlled in each stage. This can reduce the peak temperature during the combustion process and reduce the generation of thermal NOx.3. Combustion chamber designOptimized combustion chamber structure: The combustion chamber design of the biomass pellet hot air furnace is optimized to promote complete combustion of the fuel and reduce the generation of pollutants. For example, a swirl burner or a specially shaped combustion chamber is used to improve combustion efficiency and reduce NOx emissions.Secondary air injection: By introducing secondary air at the right time during the combustion process, the combustion rate and flame temperature can be controlled to further reduce the generation of NOx.4. Control systemCNC technology: The biomass pellet hot air furnace is equipped with an advanced digital control system that can monitor and adjust parameters in the combustion process, such as temperature, pressure, oxygen concentration, etc. in real time. By precisely controlling the combustion conditions, it ensures that the combustion process runs in the best state, thereby reducing NOx emissions.Adaptive control: The system has an adaptive control function, which can automatically adjust the combustion parameters according to the characteristics of the fuel and the changes in the load to maintain stable combustion performance and low emission levels.5. Tail gas treatmentSelective catalytic reduction (SCR): In some high-end biomass pellet hot air furnaces, SCR devices may be equipped to convert NOx into nitrogen and water through catalytic reactions, further reducing emissions.Non-selective catalytic reduction (SNCR): Reductants such as ammonia or urea are injected into the furnace to react chemically with NOx and convert it into nitrogen and water vapor.6. Operation managementRegular maintenance: Regularly maintain and inspect the hot air furnace to ensure that the equipment operates in the best condition and avoid increased emissions due to equipment failure.Operation training: Provide professional training for operators to ensure that they understand how to properly operate and manage the equipment to achieve low-emission operation.The biomass pellet hot air furnace achieves the goal of significantly reducing nitrogen oxide emissions by utilizing the low nitrogen characteristics of biomass pellet fuel, advanced combustion technology, optimized combustion chamber design, precise control system, and possible tail gas treatment measures. These technical advantages make the biomass pellet hot air furnace an important choice to replace traditional coal-fired hot air furnaces and achieve environmentally friendly heating.
