【Learn Ethylene Together】Five questions per day to easily learn about ethylene 14

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【Learn about Ethylene Together】Five questions per day to easily learn about ethylene. 14 66. The safety accessories of the cracking furnace drum include ( ), ( ), ( ), ( ). 67. There is a cross-sectional section between the convection and radiation sections of the pyrolyzer vessel; its purpose is ( ). 68. Generally, in situations where only cutting off the flow is required and no flow regulation is needed, in order to reduce pipeline resistance, ( ) valves are used ； Valves of type ( ) are used in situations where it is necessary to regulate flow rate or where high pressure is required. 69. The magnitude of the output signal from the integral control mechanism depends not only on ( ), but also on ( ). 70. For pipelines transporting media at high temperatures over long distances, the best choice for thermal compensation is ( ). 66. The safety accessories of the cracking furnace drum include ( ), ( ), ( ), ( ). Safety valve, level gauge, pressure gauge, emergency vent valve. 67. There is a cross-sectional section between the convection and radiation sections of the cracking furnace body; its purpose is ( ). To prevent the furnace tubes at the top of the radiation chamber from cooling down due to radiation heat loss, 68. In situations where only cutting off the flow is required and no flow regulation is needed, in order to reduce pipeline resistance, ( ) valves are used ； Valves of type ( ) are used in situations where it is necessary to regulate flow rate or where high pressure is required. Gate, cutoff at 69. The magnitude of the output signal for integral regulation depends not only on ( ), but also on ( ). The magnitude of the deviation, the duration for which the deviation exists. 70. For pipelines used for transporting media at high temperatures over long distances, the best option for thermal compensation is ( ). expansion joint