Pulverized coal burner and pulverized coal fired boiler comprising same

Pulverized coal burner and pulverized coal fired boiler comprising same

  • CN 102,235,666 B
  • Filed: 04/27/2010
  • Issued: 11/26/2014
  • Est. Priority Date: 04/27/2010
  • Status: Active Grant
First Claim
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1. a coal burner, comprises air duct and Pulverized Coal Concentration device;

  • With respect to the axis of a described air duct, described Pulverized Coal Concentration device can make breeze airflow concentration radially reduce gradually from inside to outside, it is characterized in that, also comprise the coal dust separating tube and the coal dust flow guiding cylinder that are arranged in an air duct and are positioned at described Pulverized Coal Concentration device downstream, described coal dust separating tube rear end and coal dust flow guiding cylinder front end join, the sectional area of described coal dust flow guiding cylinder front end is greater than the sectional area of coal dust separating tube rear end, between coal dust flow guiding cylinder and coal dust separating tube, forms sudden expansion structure;

    Described coal dust flow guiding cylinder outlet has the outer enlarging-angle of taper, and in the time that thin powdered coal air-flow passes through outer enlarging-angle, under outer enlarging-angle effect, thin powdered coal air-flow outwards penetrates along outer enlarging-angle bias combustion device axis;

    And thick coal culm air-flow is during through coal dust flow guiding cylinder, keep the direction of advancing along burner axis, and then make to produce predetermined jet angle between thick coal culm air-flow and thin powdered coal air current flow direction, owing to forming predetermined jet angle between thick coal culm air-flow and thin powdered coal air-flow, between thick coal culm air-flow and thin powdered coal air-flow, form an annular recirculating zone with predetermined negative pressure;

    Also comprise with the rear end of a described air duct flaring spout that is connected, increases gradually along breeze airflow flow direction sectional area, the outer enlarging-angle of described flaring spout is not less than the outer enlarging-angle of coal dust flow guiding cylinder;

    And described coal dust separating tube front portion has the flaring portion that sectional area increases gradually along breeze airflow flow direction, between described flaring portion and an air duct, reduce gradually along the passage section of breeze airflow flow direction.

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