Special Issue "Advanced Low NOx Combustion Technologies"
Deadline for manuscript submissions: 30 November 2021.
Interests: pollutant generation mechanisms and emission control technology; supercritical CO2 power generation technology; utilization of biomass and solid waste
Interests: structural features and reactivity of solid fuels; pollutant control for combustion system; utilization and incineration of solid waste
Nitrogen oxides (NOx) in the atmosphere contribute to the formation of acid rain precursors, to the destruction of ozone in the stratosphere, and to global warming. A significant amount of nitrogen oxide emissions is attributed to the combustion of biomass and fossil fuels. As a result of the need to reduce NOx emissions, various NOx reduction technologies have been investigated. Generally, the fundamental methods for NOx control technologies involve one of the following two strategies: The first strategy is that of minimizing the reaction temperature and/or delaying the mixing of nitrogen from the fuel with oxygen in the combustion air, while creating a staging zone in which NOx can be reduced to N2. This strategy is commonly called low NOx combustion and utilizes technologies including low NOx burners, combustion modifications, air-staging, fuel-staging, flue gas recirculation, reburning, and advanced reburning. The second strategy is that of injecting a reducing agent, typically ammonia or urea, that reacts with NOx to form N2 and H2O. Technologies representative of the strategy are selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR). Modifying the combustion process often controls NOx most economically, but these NOx control technologies can often be used in combination in order to obtain the ultralow NOx emissions.
In recent years, increasingly stringent NOx emissions regulations have been implemented in a number of industrialized countries; these regulations have driven and continue to drive the development of NOx emissions control techniques. Although the low NOx combustion technological principles are well established, practical and extensive adoption of low NOx combustion technology in different combustion systems is hindered by some technical and economic challenges, such as the decrease in fuel burnout and thermal efficiency, the increase in reduction gases (e.g., CO, H2S), and the increase in slagging/corrosion problems. Some efforts have been made to address those challenges by optimizing the low NOx combustion process, developing the deeply staged combustion technology and combustion diagnosis technology, and even promoting the oxy-fuel combustion and chemical looping combustion technologies. By presenting some of the latest research developments in the field of advanced low NOx combustion processes, it is hoped that additional research will provide a science-based program grounded in a fundamental understanding of NOx generation and control and will contribute to the advancement of NOx emission control technology.
Prof. Dr. Jun Xiang
Prof. Dr. Sheng Su
Manuscript Submission Information
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- Low NOx combustion technologies
- NOx emission control technologies
- CO/H2S generation control
- Low NOx burners
- Air-staging combustion process
- Fuel-staging combustion process