鞍钢某炼钢厂固定式大型平炉煤气支烟道和空气支烟道的变向阀(包括两个煤气阀、两个煤气废气阀、两个空气阀和一个空气废气阀)内衬,原为115毫米厚的耐火粘土砖砌体。生产过程中,煤气废气阀和空气废气阀在变向时通过的废气温度一般为600～700℃,有时较高(700～900℃),并有火焰。由于 The lining of the orientation valve (including two gas valves, two gas exhaust valves, two air valves, and an air exhaust valve) of a fixed large-scale open hearth gas branch and air branch flue of an iron and steel plant of Ansteel was originally 115 mm thick fire-resistant clay brickwork. During the production process, the temperature of exhaust gas passing through the gas exhaust valve and the air exhaust valve during redirection is generally 600-700°C, sometimes higher (700-900°C), and there is a flame. due to