【Learn Ethylene Together】Five questions per day to easily learn about ethylene in 24 days
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【Learn Ethylene Together】Five questions per day to easily learn about ethylene. 24 18. The main purpose of heating the cracking furnace is . ( ) a. Remove moisture from the refractory material b. Test whether the burner burns evenly c. Stabilize the deformation of the furnace tubes. 19. The design life of the furnace tubes in the radiation section of the pyrolysis furnace is . ( ) a. 7 years b. 8 years c. 10 years. 20. The main purpose of reducing the distance between the convection section tubes and the furnace wall is . ( ) a. Saving space b. Preventing flue gas short circuits c. Increasing the equivalent area for heat exchange. 21. The material of the furnace tubes has a catalytic effect on coking. ( ) a、Ni b、Cr c、Si. 22. The surface roughness of newly cast furnace tubes by centrifugal casting is the best. ( ) a. Remachining, cutting, and finishing; b. Keep as is; c. Neither has any impact. 23. Welding of furnace tubes generally employs the ______ welding method. ( ) a. Tungsten inert gas welding b. Plasma welding c. Socket welding 18. The main purpose of heating up a pyrolysis furnace is . (a) a. Remove moisture from the refractory material; b. Check whether the test burner burns evenly; c. Stabilize the deformation of the furnace tubes. 19. The design life of the furnace tubes in the radiation section of the pyrolysis furnace is . (C) a. 7 years b. 8 years c. 10 years. 20. The main purpose of shortening the distance between the convection section tubes and the furnace wall is . (b) a. Saving space; b. Preventing smoke short-circuiting; c. Increasing the equivalent area for heat exchange. 21. Certain elements in the furnace tube material act as catalysts for coking. (a) a. Ni b. Cr c. Si 22. The surface roughness of newly cast furnace tubes is best in the case of centrifugal casting. (b) a. Remachining and finishing the cut surface; b. Keeping it as is; c. Neither has any impact. 23. Welding of furnace tubes generally employs the ______ welding method. （ ） a、TIG welding b、Plasma welding c、Socket welding
18. The main purpose of heating the pyrolysis furnace is . (a) a. Remove moisture from the refractory material; b. Check whether the test burner burns evenly; c. Stabilize the deformation of the furnace tubes. 19. The design life of the furnace tubes in the radiation section of the pyrolysis furnace is . (c) a. 7 years b. 8 years c. 10 years. 20. The main purpose of reducing the distance between the convection section tubes and the furnace wall is . (b) a. Saving space; b. Preventing flue gas short-circuiting; c. Increasing the equivalent area for heat exchange. 21. Certain elements in the furnace tube material act as catalysts for coking. (a) a. Ni b. Cr c. Si 22. The surface roughness of newly cast furnace tubes is best in the case of centrifugal casting. (b) a. Remachining and finishing the cut surface; b. Keeping it as is; c. Neither has any impact. 23. Welding of furnace tubes generally employs the ______ welding method. (a) a. TIG welding b. Plasma welding c. Socket welding