Abstract: Aeeident of tube failure in the waste heat boilers with vertiealU一shaPed tubes used insynthetie ammonia Plants oecurs frequently in oPeration.In order to find out the cause ofthe tube failure,and to Present the method of solution,investigations on two一Phase flowPattern in the bend of vertiealU一shaPed tubes and the wall temPerature behavior along the忱nd under the oPerating

摘要： Aeeident of tube failure in the waste heat boilers with vertiealU一shaPed tubes used insynthetie ammonia Plants oecurs frequently in oPeration.In order to find out the cause ofthe tube failure,and to Present the method of solution,investigations on two一Phase flowPattern in the bend of vertiealU一shaPed tubes and the wall temPerature behavior along the忱nd under the oPerating