【Learn Ethylene Together】Five questions per day to easily learn about ethylene 28

Thread Content

【Learn Ethylene Together】Five questions per day to easily learn about ethylene. Question 28: Multiple choice. 6. The electronic speed control system of a steam turbine consists of the following components: ( ) a. Speed setting system b. Speed control system c. Pressure control system d. Hydraulic control system e. Steam inlet volume control system f. Steam inlet pressure control system. 7. The seals used in ethylene production units include . （） a. Dry gas seal b. Labyrinth seal c. Floating ring seal d. Mechanical seal 8. The possible reasons for an increase in the oil tank level are . ( ) a. Oil cooler leakage b. Failure of the lubricating oil control valve c. Oil pump shutdown d. Steam condensate leakage. 9. The possible reasons for fluctuations in the intake volume of the ethylene plant are as follows. ( ) a. Fluctuations in the feed to the demethanization tower b. Fluctuations in the operation of the ethylene tower c. Changes in the liquid level in the suction tank d. Changes in the composition of the refrigerant 10. Possible reasons for inadequate drying in the pyrolysis gas dryer are. （） a、High exit temperature at the fifth stage of the pyrolysis gas compressor b、Failure of the cooling system at the top of the alkali scrubber, resulting in ice-like condensation c、High exit temperature at the fourth stage of the pyrolysis gas compressor d、Mild poisoning of the pyrolysis gas dryer 6、The electronic speed control system of the turbine consists of the following parts: （a, b, c, d） a、Speed setting system b、Speed control system c、Pressure-based speed control system d、Hydraulic control system e、Steam inlet volume control system f、Steam inlet pressure control system 7、The seals used in the ethylene plant are . (a, d) a. Dry gas seal b. Labyrinth seal c. Floating ring seal d. Mechanical seal 8. Possible reasons for an increase in the oil tank level include . (a, d) a. Oil cooler leakage b. Failure of the lubricating oil control valve c. Oil pump shutdown d. Steam condensate leakage 9. Possible reasons for fluctuations in the ethylene compressor’s suction volume include. (a, b) a. Fluctuations in the feed to the demethanization tower; b. Fluctuations in the operation of the ethylene tower; c. Changes in the liquid level in the suction tank; d. Changes in the composition of the refrigerant. 10. Possible reasons for inadequate drying in the pyrolysis gas dryer are as follows. (a, b, c, d) a. High exit temperature at stage 5 of the pyrolysis gas compressor; b. Failure of the refrigeration system at the top of the alkali scrubber due to extremely low temperatures; c. High exit temperature at stage 4 of the pyrolysis gas compressor; d. Slight poisoning of the pyrolysis gas dryer