Low NOx Burner for Coal Fired Steam Generator

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Other Title
  • 石炭焚きボイラ向け新型低NOxバーナ
  • セキタンダキキ ボイラ ムケ シンガタ テイNOx バーナ

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Description

We were analyzed by CFD the generation mechanism of NOx and unburned carbon in fly ash of conventional low NOx burner. We thought the four concepts of development of new burner from CFD analysis results. The four concepts of development are as below.<BR> (1) A large, uniform ignition area is created over the entire surface of the burner nozzle to achieve better ignition performance than a conventional low NOx burner.<BR> (2) According to the coal combustion characteristics, the optimum amount of secondary air is supplied at the optimized timing in order to optimize the oxygen concentration in outer flame.<BR> (3) As result of (2), the high temperature and high oxygen level area in the outer flame, which causes the formation of NOx, is diminished.<BR> (4) By maintaining the reducing atmosphere in the inner flame, NOx is effectively reduced by the existing reducing substances in the inner flame (volatile matter and char) and simultaneously, the combustion of unburned carbon is facilitated. <BR>We developed new burner (M-PM burner) in accordance with above concepts with the combustion test in the test furnace. From the results of the combustion test in the test furnace, we are able to reduce significantly NOx emission and unburned carbon in fly ash using new burner compared with conventional low NOx burner. We also got the results that NOx emission or unburned carbon in fly ash is possible to reduce about from 25 to 30% respectively compared with the conventional low NOx burner in the field combustion test for industrial steam generator. In this paper we described the concepts of new low NOx burner, the test results in the test furnace, combustion test results of the industrial steam generator and applicable way to energy-saving operation of the steam generator.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 68 (6), 625-628, 2014

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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