1技术要求及砂型工艺存在问题火力发电厂用浓淡燃烧器零件（包括偏流短管、风口及方圆节等），均属框型铸件，壁较薄（14～16mm），内孔较大（内径或内边长500～600mm），为典型的“薄皮大馅”类铸件。燃烧器工作时，这套铸件要承受900～1150℃的高温作用及高速划过的煤粉的磨 1 technical requirements and sand-type process problems Power plant with rich and low burner parts (including bias short tube, tuyere and square section, etc.), are frame castings, the wall thinner (14 ~ 16mm), the hole larger Or the inner edge of 500 ~ 600mm), a typical “thin skinned stuffing” type castings. Burner work, the set of castings to withstand 900 ~ 1150 ℃ high temperature and high-speed across the pulverized coal mill