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Shaanxi Chemical: The Replacement of the Gasification Furnace’s Components Author/Source: Sinochem News Network Date: 2020-08-24 Clicks: 5 “Replacing the valves today was like pulling a tooth from a tiger’s mouth.” ‘The ‘tiger’s mouth’ refers to our gasification furnace, while the ‘teeth’ are the faulty valves of model Lv14005B. This ‘tooth’ is located at a critical point between the vaporization furnace and the third-stage flasher of the carbon scrubber; although it does not cause the system to stop operating immediately, its malfunction can affect the system’s ‘nervous system’. We must remove this faulty ‘tooth’ right away today and replace it with a new one. ”At around 5 p.m. on August 17, the Gasification Plant of Shaanxi Chemical Industry Company, in conjunction with the Maintenance Plant and the Electrical and Instrumentation Plant, replaced the Lv14005B valve of Gasifier No. 2. After the failure of the Lv14005B valve, a joint consultation among the gasification, electrical and instrumentation, and maintenance teams led to the decision to replace the valve, removing this \"faulty tooth\". During this period, to maintain continuous operation of the gasification furnace, the black water in front of the valve was temporarily diverted to the V1048 sedimentation tank. However, prolonged direct discharge into the V1408 sedimentation tank will affect the quality of the circulating ash water in the gasification system. Thus, a jointly organized emergency operation to “extract” the gasifier nozzle began. In the storm, they followed the plan and various thorough \"desktop\" simulation steps, working diligently and methodically to carefully eliminate the peripheral \"components\". The operators at the gasification plant adjusted the valves of the relevant pipelines accordingly, and the Lv14005B valve was isolated; the electrical and instrumentation crew then removed the air supply device from that valve. Due to the large size of the valve and its location below the third-floor floor, the operating space is limited ； After measuring the valve dimensions, the welders at the maintenance facility cut a square hole in the floor right above it, and used chain blocks to secure the valve on all sides ； After the operators at the gasification plant quickly adjusted the valves on the relevant pipelines, the electrical and instrumentation staff skillfully removed the electrical and instrumentation equipment. At around 6 p.m., all areas surrounding the “tooth” were isolated, and maintenance staff followed shortly after. The high-mounted chain block acted like large-sized \"scissors,\" used to extract the \"damaged tooth\" from the furnace mouth in a steady, precise, and rapid manner. At 9:30 p.m., the new valve arrived. By using the winch to pull it back, it was brought to the furnace opening, and a new \"tooth\" was successfully installed in the gasification furnace opening; the tooth replacement operation was a success.