[Q&A Question 331] 2017.12.15
Thread Content
【Q&A Question 331】December 15, 2017: What is the function and working principle of the deaerator in a hydrogen production plant? Its function is to remove oxygen and other gases from the boiler feedwater, ensuring the quality of the feedwater; at the same time, it acts as a mixed heater in the heating system, serving to heat the feedwater. Principle: The amount of gas dissolved in water is related to the type of gas, the temperature of the water, and the partial pressures of various gases at the water surface. The working principle of a deaerator is to pass steam at stable pressure into the deaerator to heat the feed water. During this heating process, the partial pressure of steam above the water surface gradually increases, while the partial pressures of other gases decrease, causing the gases present in the water to be continuously separated out. When water is heated to its saturation temperature at the pressure of the deaerator, the space above the water surface is completely filled with water vapor, and the partial pressures of various gases approach zero; at this point, the oxygen and other gases in the water are removed. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2017 Daily Image Summary Thread https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 2017 LNG Version Daily Question List https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html
The principle of the deaerator relies primarily on Henry’s law and Dalton’s law: the solubility of oxygen in water is directly proportional to the partial pressure of the gas, and inversely proportional to temperature. When the demineralized water is heated to 90 degrees, it enters an atmospheric deaerator; the partial pressure of gas above the water surface is almost zero, so oxygen is removed from the liquid.
The main function of the deaerator is to remove oxygen from the feedwater in order to ensure its quality. The working principle of a deaerator is to use steam to heat water, bringing it to its saturated temperature at a certain pressure, that is, its boiling point.
The oxygen in the hydrogen of the semi-finished product is removed by causing oxygen and hydrogen to react to form water under the action of a catalyst at a certain temperature, followed by drying treatment
The principle of the deaerator relies primarily on Henry’s law and Dalton’s law: the solubility of oxygen in water is directly proportional to the partial pressure of the gas, and inversely proportional to temperature. When the demineralized water is heated to 90 degrees, it enters an atmospheric deaerator; the partial pressure of gas above the water surface is almost zero, so oxygen is removed from the liquid.
Steam with stable pressure is introduced into the deaerator to heat the feed water. During this heating process, the partial pressure of steam at the water surface gradually increases, while the partial pressures of other gases decrease, causing the gases present in the water to continuously separate and precipitate out.
By heating, the partial pressure of oxygen in water is increased, facilitating the diffusion of oxygen from the liquid state to the gas state, which is then removed by blowing air.
Remove oxygen from the demineralized water to prevent scaling. I don’t know the principle; is it heating?
The principle of the deaerator relies primarily on Henry’s law and Dalton’s law: the solubility of oxygen in water is directly proportional to the partial pressure of the gas, and inversely proportional to temperature. When the demineralized water is heated to 90 degrees, it enters an atmospheric deaerator; the partial pressure of gas above the water surface is almost zero, so oxygen is removed from the liquid.
The main function of the deaerator is to remove oxygen from the feedwater in order to ensure its quality. The working principle of a deaerator is to use steam to heat water, bringing it to its saturated temperature at a certain pressure, that is, its boiling point. At this point, the space inside the deaerator is filled with water vapor, and the partial pressure of oxygen gradually drops to zero; all the oxygen dissolved in the water escapes, ensuring that the oxygen content in the feedwater remains within acceptable levels.