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W形火焰是国外开发出来用于燃烧低挥发分煤种的一种燃烧技术。在现代高参数、大容量燃煤锅炉中,较多的采用四角切圆燃烧方式。但这种燃烧方式在燃烧劣质煤,特别是低挥发分的无烟煤时,存在着火不好、燃烧不稳定、运行易结渣、低负荷下必须投油等问题。为了更好地燃烧无烟煤,国外锅炉厂商开发出多种燃烧技术,其中W形火焰技术是实践证明比较成功的燃烧技术,并已在国外得到广泛应用。在结构上W型火焰锅炉(见图1)和一般四角切圆燃烧方式锅炉的п型结构不同,它的燃烧室由2部分组成,上部是辐射炉室,下部为拱形的燃烧室,燃烧室的深度一般比辐射炉室大80%～120%,前面突出部分的顶部构成拱体,煤粉气流和二次风喷嘴装设在拱体上,下喷的煤粉气流接受炉
W-shaped flame is developed abroad for combustion of low-volatile coal combustion technology. In the modern high-parameter, high-capacity coal-fired boilers, more use of tangential combustion four corners. However, when this kind of combustion method burns low-grade coal, especially low-volatile anthracite coal, there are problems such as poor fire, unstable combustion, easy operation and slagging, and low oil load. In order to better burn anthracite, foreign boiler manufacturers have developed a variety of combustion technologies, of which W-shaped flame technology is proved to be more successful combustion technology, and has been widely used abroad. Structure in the W-type flame boiler (Figure 1) and the general square tangentially fired boiler п type structure, its combustion chamber consists of two parts, the upper part of the radiation chamber, the lower part of the arch-shaped combustion chamber, combustion The depth of the chamber is generally 80% ~ 120% larger than the radiant chamber, the top of the front protruding part forms the arch, the pulverized coal flow and the secondary air nozzle are arranged on the arch body,