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我厂用自制的内混合天然气割枪,采用外送粉的方式成功地切割了1800×1100毫米的不锈钢冒口。割枪及其咀子如图1所示。不锈钢切割时,由于氧化反应产生的高熔点(约2000℃)的Cr_2O_3熔渣,妨碍切割的正常进行。因此在大厚度切割中,采用铁粉助熔,去掉Cr_2O_3熔渣。铁粉输送咀起割咀外层咀套和输送铁粉两种作用。采用的铁粉为80～100目的低碳铁粉(含碳0.06～0.07%)。使用前,烘干过筛,而后装入送粉罐。送粉气为天燃气,其关路压力为2.2公斤/厘米~2,实际用1公斤/厘米~2。铁粉耗量为0.5公斤/分。切割的高压氧压力为8～9公斤/厘米~2,咀芯孔径为9.5毫米,其切割氧耗量为115～120米~3/小时。切割速度最大为60毫米/分。工件需预热
I plant with homemade internal mixed gas torch, the use of powder delivery to successfully cut the 1800 × 1100 mm stainless steel riser. Torch and its Tsui shown in Figure 1. Stainless steel cutting, due to the oxidation reaction of high melting point (about 2000 ℃) Cr_2O_3 slag, hinder the normal cut. Therefore, cutting in a large thickness, the use of iron powder flux, remove Cr_2O_3 slag. Tsui iron nozzle Tsui Tsui from the outer sleeve and the role of iron transport. The used iron powder is 80-100 mesh low carbon iron powder (carbon 0.06 ~ 0.07%). Before use, drying screen, and then into the powder tank. To send powder gas for natural gas, the pressure off the road for 2.2 kg / cm ~ 2, the actual use of 1 kg / cm ~ 2. Iron consumption of 0.5 kg / min. The pressure of cutting hyperbaric oxygen is 8 ~ 9 kg / cm ~ 2, the core hole diameter is 9.5 mm, the cutting oxygen consumption is 115 ~ 120 m ~ 3 / h. Cutting speed up to 60 mm / min. Workpiece to be preheated