| 摘要 |
<p>A coal burner comprises a stoker portion (2) which feeds coal to, and extracts ash from, a combustion portion (3). The combustion portion (3) comprises a succession of concave grate sections (51 to 56) which define steps between adjacent sections, such that the coal travels through the grate and falls progressively down the steps. Venturi ports (58) and tuyere air ports (60) provide an air flow through the combustion portion (3), to promote movement of the coal both in an axial direction and with a circulatory motion. Optionally, the concave grate sections can be provided with pawls (77) which may be caused to project through apertures in the grate sections, so as to dislodge any fuel or fuel residues within the grate sections (Figs. 7, 8).</p> |
