Removal of Nitrogen Oxides Contained in Combustion Exhaust Gas by Nitrogen Plasma Injection

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概要

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• The purpose of this study is to investigate the method of removing the NO_x contained in combustion exhaust gases by nitrogen plasma injection. Removal characteristics of NO_x are studied under the Zeldovich mechanism. First, the temperature and velocity distributions of the plasma wake were measured along the plasma jet axis. Optimum flow rates of plasma N_2 gas and simulated exhaust gas were determined after consideration of stable plasma operation and the formation of N atoms in arc plasma. Secondly, the simulated exhaust gas (N_2+O_2+CO_2+NO) was mixed with N atoms produced in the N_2 plasma. The Zeldovich reactions for excited N atoms with NO and O_2 will take place. The effects of O_2, CO_2, and H_2O on the reduction of NO_x were studied experimentally. The NO_x removal ratio of 40 to 50% is observed under the condition of O_2 concentration of 3 to 5% and the plasma power of 600 W ; CO concentration generated in the exhaust gas is about 300 ppm. The removal ratio η is highest for a low reaction temperature of less than 500 K. The value of η changes from 100 to 60% due to the addition of H_2O to gas. However, the recovery of the removal ratio is achieved by changing the gas injection site to plasma, as a result of the decrease of OH radical formation. Retention time required for reaction is less than ten milliseconds.

• 一般社団法人日本機械学会の論文
• 1994-11-15

著者

• Morimune Takaaki

  Department Of Mechanical Engineering Faculty Of Technology Tokyo Metropolitan University

• Ejiri Yuhji

  Graduate School of Mechanical Engineering, Tokyo Metropolitan University

• Ejiri Yuhji

  Graduate School Of Mechanical Engineering Tokyo Metropolitan University

関連論文

• Study of Compressible High Speed Gas Flow in Piping System : 2nd Report, Piping Systems with Sudden Enlargement
• Study of ComPressible High Speed Gas Flow in Piping System : 1st Report, Piping Systems with Bends or Elbows
• Study of Catalytic Reduction of Nox in Flue Gas from a Municipal Refuse Incinerator (Experimental Results of Nox Removal Test Plant)
• Removal of Nitrogen Oxides Contained in Combustion Exhaust Gas by Nitrogen Plasma Injection
• Exhaust Gas Cleaning by Plasma Jet : Designing of Plasma Generator and Formation of Nitrogen Oxides in Presence of Oxygen

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