【Learn Ethylene Together】Five questions per day to easily learn about ethylene in 40 days
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【Learn Ethylene Together】Five questions per day to easily learn about ethylene; 3 short-answer questions are sufficient. 4 is too many. 3. Why shouldn’t sealed steam be introduced too early, and when is the appropriate time to introduce it? 4. Analyze the causes of the decrease in vacuum level in the rehydration unit and the corresponding treatment methods. 5. What are the hazards of high and low liquid levels in the rewatering tank of a extraction-condensing turbine compressor? 6. Briefly describe the reset procedure for the pyrolysis gas compressor? 3. Why is it not advisable to introduce sealed steam too early, and when is the appropriate time to do so? Answer: Since the temperature of the machine is low, introducing sealing steam too early can lead to high local temperatures in the sealing chamber; the shafts exposed to such heat are prone to bending. It is generally better to introduce the sealing steam 20 minutes after the machine has warmed up or before increasing its speed. Introducing sealed steam too early will cause the exhaust temperature to rise too rapidly. 4. Analyze the reasons for the decrease in the vacuum level of the reheat apparatus and the corresponding treatment methods. Answer: Reasons: 1. High temperature of the cooling water; 2. Low flow rate of the cooling water; 3. Severe leakage (leakage from the turbine seal); 4. Large fluctuations in the extraction steam regulator; 5. Faults in the jet pump; 6. Complete failure of the water seal of the atmospheric safety valve; 7. The float ball of the non-condensable gas trap cannot descend properly. Solutions: 1. Contact the dispatch team to reduce the temperature of the cooling water as much as possible; 2. Increase the flow rate of the cooling water; 3. Identify and repair the leakage points; 4. Stabilize the amount of extraction steam; 5. Inspect and fix any faults in the jet pump; 6. Re-establish the water seal; 7. Check whether the float ball is functioning properly. 5. What are the hazards associated with high or low liquid levels in the rewatering tank of a extraction-condensing turbine compressor? Answer: Excessively high liquid levels reduce the area of the heat exchanger, preventing the turbine exhaust gas from condensing properly. Excessively low liquid levels can lead to cavitation in the feedwater pump; uncondensed steam is carried along with the feedwater, which reduces the efficiency of the jet pump condenser and results in a decrease in vacuum level. 6. Briefly describe the reset procedure for the pyrolysis gas compressor? Answer: 1. Reset the electronic governor by pressing the reset button on its keyboard. 2. Press the reset button indoors. 3. Reset the on-site solenoid valve (or move the reset lever). 4. Reset the main steam valve (ensure that the main steam is shut off; otherwise it cannot be reset to its normal position)
3. Why is it not advisable to introduce sealed steam too early, and when is the appropriate time to do so? Due to the low temperature of the machine, introducing sealing steam too early can lead to high local temperatures in the sealing chamber, and the shafts exposed to such heat are prone to bending; it is generally better to do this 20 minutes after the machine has been warmed up or before increasing its speed. Introducing sealed steam too early will cause the exhaust temperature to rise too rapidly. 4. Analyze the reasons for the decrease in the vacuum level of the reheat apparatus and the corresponding treatment methods. Reasons: 1) High temperature of cooling water; 2) Low flow rate of cooling water; 3) Severe leakage (leakage in the turbine seal); 4) Large fluctuations in the extraction steam regulator; 5) Fault in the jet pump; 6) Complete destruction of the water seal of the atmospheric safety valve; 7) The float ball of the non-condensable gas trap cannot descend. Actions to take: 1) Contact the dispatch team to reduce the temperature of the cooling water as much as possible; 2) Increase the flow rate of cooling water; 3) Identify and repair the leakage points; 4) Stabilize the extraction steam volume; 5) Check and fix the faults in the jet pump; 6) Re-establish the water seal; 7) Check whether the float ball is functioning properly. 5. What are the hazards of high or low liquid levels in the recondenser of a extraction-type turbocompressor? 6. Briefly describe the reset procedure for the pyrolysis gas compressor? 1 1). Reset the electronic governor by pressing the reset button on its keyboard. 2). Press the reset button inside the control room. 3). Reset the on-site solenoid valve (or move the reset lever). 4). Reset the main steam valve (ensure that the main steam is shut off; otherwise, it cannot be reset to its normal position)
3. Why is it not advisable to introduce sealed steam too early, and when is the appropriate time to do so? Answer: Since the temperature of the machine is low, introducing sealing steam too early can lead to high local temperatures in the sealing chamber; the shafts exposed to such heat are prone to bending. It is generally better to introduce the sealing steam 20 minutes after the machine has been warmed up, or before increasing its speed. Introducing sealed steam too early will cause the exhaust temperature to rise too rapidly. 4. Analyze the reasons for the decrease in the vacuum level of the reheat apparatus and the corresponding treatment methods. Reasons: 1. High temperature of cooling water; 2. Low flow rate of cooling water; 3. Severe leakage (leakage from the turbine seal); 4. Large fluctuations in the extraction steam regulator; 5. Fault in the jet pump; 6. Complete destruction of the water seal of the atmospheric safety valve; 7. The float ball of the non-condensable gas trap cannot descend properly. Solutions: 1. Contact the dispatch team to reduce the temperature of the cooling water as much as possible; 2. Increase the flow rate of cooling water; 3. Identify and repair the leakage points; 4. Stabilize the amount of extraction steam; 5. Inspect and fix the faults in the jet pump; 6. Reestablish the water seal; 7. Check whether the float ball is functioning properly. 6. Briefly describe the steps for resetting the pyrolysis gas compressor 1. Reset the electronic governor by pressing the reset button on its keyboard. 2. Press the reset button indoors. 3. Reset the on-site solenoid valve (or move the reset lever). 4. Reset the main steam valve (ensure that the main steam is shut off; otherwise, it cannot be reset to its original position)
3. Why is it not advisable to introduce sealed steam too early, and when is the appropriate time to do so? Answer: Since the temperature of the machine is low, introducing sealing steam too early can lead to high local temperatures in the sealing chamber; the shafts exposed to such heat are prone to bending. It is generally better to introduce the sealing steam 20 minutes after the machine has been warmed up, or before increasing its speed. Introducing sealed steam too early will cause the exhaust temperature to rise too rapidly. 4. Analyze the reasons for the decrease in the vacuum level of the reheat apparatus and the corresponding treatment methods. Reasons: 1. High temperature of cooling water; 2. Low flow rate of cooling water; 3. Severe leakage (leakage from the turbine seal); 4. Large fluctuations in the extraction steam regulator; 5. Fault in the jet pump; 6. Complete destruction of the water seal of the atmospheric safety valve; 7. The float ball of the non-condensable gas trap cannot descend properly. Solutions: 1. Contact the dispatch team to reduce the temperature of the cooling water as much as possible; 2. Increase the flow rate of cooling water; 3. Identify and repair the leakage points; 4. Stabilize the amount of extraction steam; 5. Inspect and fix the faults in the jet pump; 6. Reestablish the water seal; 7. Check whether the float ball is functioning properly. 6. Briefly describe the steps for resetting the pyrolysis gas compressor 1. Reset the electronic governor by pressing the reset button on its keyboard. 2. Press the reset button indoors. 3. Reset the on-site solenoid valve (or move the reset lever). 4. Reset the main steam valve (ensure that the main steam is shut off; otherwise, it cannot be reset to its original position)
3. Why is it not advisable to introduce sealed steam too early, and when is the appropriate time to do so? Due to the low temperature of the machine, introducing sealing steam too early can lead to high local temperatures in the sealing chamber, and the shafts exposed to such heat are prone to bending; it is generally better to do this 20 minutes after the machine has been warmed up or before increasing its speed. Introducing sealed steam too early will cause the exhaust temperature to rise too rapidly. 4. Analyze the reasons for the decrease in the vacuum level of the reheat apparatus and the corresponding treatment methods. Reasons: 1) High cooling water temperature? ?? ?? ?? ? 2) Low cooling water flow rate? ?? ??? 3) Severe leakage (turbine seal leakage)? ?? ?? ?? ? 4) Large fluctuations in the extraction steam regulator? ?? ??? 5) Fault in the jet pump? ?? ?? ?? ? 6) Complete failure of the water seal on the atmospheric safety valve? ?? ??? 7) The float ball of the non-condensable gas trap cannot descend properly. Solutions: 1) Contact the dispatch team to reduce the cooling water inlet temperature as much as possible? ?? ?? ??? 2) Increase the cooling water flow rate? ?? ??? 3) Identify and repair the leakage points? ?? ?? ?? ? 4) Stabilize the extraction steam volume? ?? ? 5) Check and address any faults in the jet pump? ?? ?? ?? ? 6) Re-establish the water seal? ?? ??? 7) Check whether the float ball is functioning properly. 5. What are the hazards of high or low liquid levels in the rewatering unit of a extraction-condensing turbine compressor? 6. Briefly describe the reset procedure for the pyrolysis gas compressor? 1 1). Reset the electronic governor by pressing the reset button on its keyboard. 2). Press the reset button inside the control room. 3). Reset the on-site solenoid valve (or move the reset lever). 4). Reset the main steam valve (ensure that the main steam is shut off; otherwise, it cannot be reset to its normal position)