【Daily Question】Chemical Engineering Principles 268: Dissolved Oxygen (December 20)
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This post was last edited by “Back to Cambridge” on December 26, 2015, at 13:21. Starting today, the Chemical Engineering Theory section is launching the “Question of the Day” activity, aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequently, series such as “Fundamentals of Chemical Engineering”, “Mass Transfer and Separation”, “Chemical Thermodynamics”, and “Chemical Process Technology” will also be introduced. We hope for your active participation! For responses to the “Question of the Day” activity, answers can be viewed directly; however, the thread will be closed after one day ! To encourage continued participation from everyone this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points for correct answers~~~ Short answer question: What are the reasons for insufficient dissolved oxygen? The main reasons for insufficient dissolved oxygen in the feed water are: (1) Abnormal operating parameters of the deaerator (temperature, pressure). (2) Excessively high dissolved oxygen at the deaerator inlet. (3) There are defects inside the deaerator unit. (4) Large load fluctuations result in increased water replenishment. (5) The exhaust valve opening is not appropriate.
What are the reasons for insufficient dissolved oxygen? (1) The operating parameters of the deaerator (temperature, pressure) are abnormal. (2) Excessively high dissolved oxygen at the deaerator inlet. (3) There is a defect inside the deaerator unit. (4) Large load fluctuations result in increased water makeup. (5) The exhaust valve opening is not appropriate. ）
1. The operating parameters of the deaerator (pressure, temperature) are abnormal； 2. Excessively high dissolved oxygen at the deaerator inlet ； 3. Defects exist within the deaerator unit ； 4. Load fluctuations are large, resulting in an increase in ice volume ； 5. The exhaust valve opening is not appropriate.
1. The operating parameters of the deaerator (temperature, pressure) are abnormal. 2. The dissolved oxygen at the deaerator inlet is too high. 3. There are defects inside the deaerator. 4. Load fluctuations are large, resulting in increased water replenishment. 5. The opening degree of the exhaust valve is inappropriate.
What are the reasons for insufficient dissolved oxygen? The main issues are: (1) Abnormal operating parameters of the deaerator (temperature, pressure). (2) Excessively high dissolved oxygen at the deaerator inlet. (3) There are defects inside the deaerator unit. (4) Large load fluctuations result in increased water replenishment. (5) The exhaust valve opening is not appropriate.
The following situations can lead to insufficient dissolved oxygen levels in the feedwater: (1) Abnormal operating parameters of the deaerator (temperature, pressure); (2) Leaks at the inlet of the feedwater pump; (3) Excessively high dissolved oxygen levels at the deaerator inlet; (4) Air leakage due to leaks in the sampling pipes; (5) Insufficient addition of diamine to the feedwater; (6) Defects inside the deaerator unit; (7) Large fluctuations in load, resulting in increased make-up water volume; (8) Inappropriate opening degree of the steam exhaust valve; (9) Expired analytical reagents or inaccurate instruments
Reasons for unacceptable dissolved oxygen levels in boiler feedwater: The following situations can lead to unacceptable dissolved oxygen levels in the feedwater: (1) Abnormal operating parameters of the deaerator (temperature, pressure); (2) Leaks at the inlet of the feedwater pump; (3) Excessively high dissolved oxygen levels at the deaerator inlet; (4) Air leakage due to leaks in the sampling pipes; (5) Insufficient addition of diamine to the feedwater; (6) Defects within the deaerator apparatus; (7) Large fluctuations in load, resulting in increased make-up water volume; (8) Inappropriate opening degree of the steam exhaust valve; (9) Expired testing reagents or inaccurate instruments
The main reasons for insufficient dissolved oxygen in the feed water are: (1) Abnormal operating parameters of the deaerator (temperature, pressure). (2) Excessively high dissolved oxygen at the deaerator inlet. (3) There are defects inside the deaerator unit. (4) Large load fluctuations result in increased water replenishment. (5) The exhaust valve opening is not appropriate.
Answer: 1. The operating parameters of the deaerator (temperature, pressure) are abnormal. 2. The dissolved oxygen at the deaerator inlet is too high. 3. There are defects inside the deaerator unit. 4. The load varies greatly, resulting in an increased water replenishment volume. 5. The exhaust valve opening is not appropriate.
1. The device has defects. 2. Improper operation adjustment. Such as low steam pressure, excessive water inflow, low water temperature, and high water level. 3. The operating mode is unreasonable. Such as excessive water drainage at high temperatures, or steam resistance caused by too high heating steam pressure. 4. The exhaust valve opening is insufficient.