Study of NOx Inhibition Technology Based on Water-Gas Reaction

Abstract:

Pulverized coal combustion is one of the main NOx emission sources. The existing low NOx combustion technology can not meet the requirements of environment conservation. In this paper, a new low NOx combustion technology, the NOx inhibition method based on water-gas reaction, is presented, in which steam is injected into the anoxic flame of pulverized coal to bring water-gas reaction and produce CO and H₂ which will inhibit the production of NOx. The produced H₂ is especially very active. Water-gas reaction is endothermic, which has an effect of reducing the peak temperature of the flame and is very propitious to the inhibition of thermal type NOx. As the water-gas reaction is also an interim process, the heat absorbed in it will be released when burning with oxygen so that the whole amount of heat inside the furnace is not affected. The principle of the method is proved correct by experiments and industrial scale of 420 t/h boiler tests in which the effect of NOx reduction is obvious. The technology is consistent with that of air-staged combustion.

• Periodical: Applied Mechanics and Materials (Volume 737)
• Pages: 584-587
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.737.584
• Online since: March 2015
• Authors: Tian Hua Wu*, Ren Zhang Qian
• Keywords: Formation Mechanism, Nox Control, Pollution Control, Water-Gas Reaction

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