【Daily Question】Chemical Engineering Principles 417: Deaerator (August 30)
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The last edit to this post was made by Zaihui Kangqiao on 2016-8-30 at 08:38. The Chemical Engineering Theory section is now launching a \"One Question per Day\" initiative aimed at helping everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope you will give it your active support! Wishing everyone a happy Christmas! Answers to the questions in the \"One Question per Day\" initiative can be viewed directly; the thread will be closed after 1 day ! To encourage continued participation from everyone this year! Participation earns 3 wealth points, with an additional 4 wealth points for correct answers~~~ Short answer question: From an operational perspective, how can the deoxidation efficiency of a deaerator be ensured? Answer: 1) Deoxygenated water should be heated to its boiling point; pay attention to adjusting the amount of steam and water to ensure that the water in the deaerator remains in a boiling state ； 2) The exhaust from the deaerator should be unobstructed ； 3) The amount of make-up water should be stable; it must flow into the deaerator in a continuous and even manner, without interruptions, and large amounts of make-up water should not be introduced suddenly
Answer: 1) Deoxygenated water should be heated to the boiling point; pay attention to adjusting the amount of steam and water to ensure that the water in the deaerator remains in a boiling state； 2) The exhaust from the deaerator should be unobstructed ； 3) The amount of make-up water should be stable; it must flow into the deaerator in a continuous and even manner, without interruptions, and large amounts of make-up water should not be introduced suddenly ； 4) The water distribution in the deaerator must be even, so as to provide the water with sufficient surface area for mixing with the heating steam; this ensures that the required heat is available for deoxygenated water and helps to facilitate the rapid removal of oxygen from the water.
First, it is necessary to keep the pressure of the deaerator within the specified range; otherwise, a low pressure may result in poor deoxygenation, while a high pressure leads to steam waste. Secondly, it is necessary to ensure that the temperature of the water entering the deaerator is appropriate; if the inlet water temperature is too high, the deoxygenation effect will be poor, and if it is too low, more steam will be required to achieve an effective deoxygenation. Third, it is necessary to control the level of the deaerator properly; otherwise, large fluctuations in the liquid level can also cause fluctuations in the deaerator pressure, which in turn affects the deoxidation efficiency.
①Heat to the saturation temperature at the corresponding pressure; ② Ensure a thorough separation of the gases; ③ Provide space for the separation of water and steam
1. Heat the deoxygenated water to its boiling point; the amounts of steam and water must be adjusted appropriately to ensure that the water in the deoxygenator remains at a boiling state； 2. The exhaust from the deaerator should be unobstructed ； 3. Make sure the make-up water enters the deaerator in a continuous and uniform manner, with no significant fluctuations in flow rate ； 4. The water distribution in the deaerator is even, allowing for thorough mixing of water and heating steam; this ensures that the necessary heat is available for the deoxygenated water, thereby enabling oxygen to be removed from the water.
1. Deoxygenated water should be heated to the boiling point; pay attention to adjusting the amount of steam and water to ensure that the water in the deaerator remains in a boiling state； 2. The exhaust from the deaerator should be unobstructed ； 3. The amount of make-up water should be stable; it must flow into the deaerator in a continuous and even manner, without interruptions, and large amounts of make-up water should not be introduced suddenly ； 4. The water distribution in the deaerator must be even, so that the water has sufficient surface area to mix with the heating steam; this ensures that the required heat is supplied to the deoxygenated water and that oxygen can be rapidly removed from it.
Check the sealing performance and add online monitoring for water output
1) Deoxygenated water should be heated to the boiling point; pay attention to adjusting the amount of steam and water to ensure that the water in the deaerator remains in a boiling state； 2) The exhaust from the deaerator should be unobstructed ； 3) The amount of make-up water should be stable; it must flow into the deaerator in a continuous and even manner. Intermittent supply is not suitable, nor is it acceptable to introduce a large amount of make-up water suddenly ； 4) The water distribution in the deaerator must be even, so that the water has sufficient surface area to mix with the heating steam, thereby ensuring the heat required for deoxygenated water and allowing oxygen to be separated from the water rapidly.
1. Ensure the water replenishment temperature； 2. Adjust the opening degrees of the primary and secondary steam valves appropriately ； 3. Reasonably arrange the operating mode of the water pump ； 4. Minimize or eliminate water in the exhaust steam ； 5. Detect defects promptly and address them in a timely manner ； 6. Strengthen training for operators
1) Deoxygenated water should be heated to the boiling point; pay attention to adjusting the amount of steam and water to ensure that the water in the deaerator remains in a boiling state； 2) The exhaust from the deaerator should be unobstructed ； 3) The amount of make-up water should be stable; it must flow into the deaerator in a continuous and even manner, without interruptions, and large amounts of make-up water should not be introduced suddenly ； 4) The water distribution in the deaerator must be even, so that the water has sufficient surface area to mix with the heating steam, thereby ensuring the heat required for deoxygenated water and allowing oxygen to be separated from the water rapidly.