公开(公告)号：US5806443A

公开(公告)日：1998-09-15

申请号：US462292

申请日：1995-06-05

申请人： Hironobu Kobayashi ,  Kiyoshi Narato ,  Masayuki Taniguchi ,  Tsuyoshi Kouno ,  Hirofumi Okazaki ,  Shigeki Morita ,  Toshikazu Tsumura

发明人： Hironobu Kobayashi ,  Kiyoshi Narato ,  Masayuki Taniguchi ,  Tsuyoshi Kouno ,  Hirofumi Okazaki ,  Shigeki Morita ,  Toshikazu Tsumura

IPC分类号： F23C99/00 ,  F23C7/00 ,  F23D1/00 ,  F23D1/02 ,  F23D17/00 ,  F23C1/12

CPC分类号： F23C7/006 ,  F23D1/00 ,  F23D17/007

摘要： To provide a pulverized coal burner capable of reducing the NOx concentration at the time of a low load, a pulverized coal burner includes a secondary air nozzle and a tertiary air nozzle concentrically positioned about the outer periphery of a fuel nozzle carrying a pulverized coal with a primary air, and two swirling flow generators are included at least one of these nozzles with a positional relation parallel to a flow of air. One of the swirling flow of the two swirling flow generators can be set strongly. And, under a condition of low air flow rate, air can be supplied from one swirling flow generator alone. Since the swirling strength of the combustion air can be increased, the concentration of NOx produced by the combustion of the pulverized coal can be reduced. Also, because the swirling strength at the time of low load can be increased, the NOx concentration can be reduced by keeping the pulverized coal flame stable.

摘要翻译： 为了提供能够降低低负荷时的NOx浓度的粉煤燃烧器，粉煤燃烧器包括二次空气喷嘴和三次空气喷嘴，该二次空气喷嘴和三次空气喷嘴同轴地位于燃料喷嘴的外周，该燃料喷嘴承载有粉煤 一次空气和两个旋流产生器包括具有与空气流平行的位置关系的这些喷嘴中的至少一个。 两个回旋流发生器的旋流之一可以强烈地设定。 并且，在空气流量低的条件下，可以单独从一个旋流发生器供给空气。 由于能够提高燃烧空气的旋转强度，所以可以降低由粉煤燃烧产生的NOx的浓度。 此外，由于可以提高低负荷时的旋转强度，所以可以通过保持粉煤火焰稳定而降低NOx浓度。