【Daily Question】1.4 Principle of thermal deaeration (3 wealth points for a reply + additional 3–8 wealth points if the answer is correct)
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Question: Please briefly explain the principle of thermal deaeration. The principle is based on the law of gas dissolution (Henry’s law): the solubility of any gas in water is related to the partial pressure of that gas at the gas-water interface as well as the water temperature. The higher the temperature, the higher the partial pressure of water vapor, while the partial pressures of other gases decrease. When the water temperature rises to the boiling point, the partial pressures of other gases become zero, and thus their concentration in water also becomes zero. Requirements and hints for answering the question: Requirements: Basic laws must be provided. Hint: Solubility. Note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful one), along with the answer and explanation. Other details: Recruitment for moderators & technicians in the [Mechanical Zone] – applications and referrals are welcome. 【Valid indefinitely】【If you’re interested, come ahead!】 】(Click to enter) 【Mechanical Zone】Comprehensive guide to preventing equipment freezing over during winter 【Mechanical Zone】Call for collection of essential knowledge 【Seeking manufacturer sponsors】(Ongoing campaign) Rewards for recommending valuable content; the “Most Active Users and Weekly Stars” competition in the Mechanical Zone has begun. Wealth, metals, corrosion, zones, machinery
1. The principle of thermal deoxidation is based on Henry’s law and Dalton’s law. Henry’s law states that when a liquid and a gas are in equilibrium, at a given temperature, the amount of gas dissolved per unit volume of water is constant. Dalton’s law states that the total pressure of a mixed gas is equal to the sum of the partial pressures of its constituent gases, and this total pressure is proportional to the partial pressure of that gas above the water surface.
1. The principle of thermal deoxidation is based on Henry’s law and Dalton’s law. Henry’s law states that when a liquid and a gas are in equilibrium, at a given temperature, the amount of gas dissolved per unit volume of water is constant. Dalton’s law states that the total pressure of a mixed gas is equal to the sum of the partial pressures of its constituent gases, and this total pressure is proportional to the partial pressure of that gas above the water surface.
Basic principle of thermal deaeration: In a container, the amount of gas dissolved in water is proportional to the partial pressure of the gas above the water surface. Based on the dissolution properties of gases in water, to remove any given gas from water, it is sufficient to eliminate that gas from the surface of the water. Therefore, to remove various gases from water, it is ideal for there to be only water vapor on the surface and no other gases. Thermal deoxygenation involves heating water to its boiling point, which reduces the solubility of oxygen and causes it to escape; the oxygen that forms on the surface of the water is then removed, filling the water with steam. In this way, oxygen is continuously removed from the water, ensuring that its oxygen content meets the requirements specified for water quality standards.
The principle of thermal deoxidation. The principle of thermal deoxidation is based on Henry’s law and Dalton’s law. Henry’s law states that when a liquid and a gas are in equilibrium, at a given temperature, the amount of gas dissolved per unit volume of water is constant. Dalton’s law states that the total pressure of a mixed gas is equal to the sum of the partial pressures of its constituent gases, and this total pressure is proportional to the partial pressure of that gas above the water surface. The thermal deaerator (high-efficiency rotating film deaerator) relies on Henry’s law; its design features components consisting of three rotating film elements with different functions, thereby establishing a mass transfer mechanism in the gaseous phase and improving the rotating film technology. The heat and mass transfer mechanism of the rotary membrane deaerator differs from that of existing liquid-column, atomization, and bubbling types; it integrates three mechanisms—jet flow, rotating membrane, and suspended bubbling—into a single heat and mass transfer approach, thereby achieving high efficiency. Replace natural falling film with forced falling film to increase the renewal rate of the liquid film, enabling it to rotate vigorously along the tube wall and draw in a large amount of steam, thereby enhancing heat and mass transfer efficiency ； Changing from counter-current bubbling to suspended bubbling increases the onset of splashing at high steam flow rates within the layer, while maintaining the gas channels ； The three separate modes of heat and mass transfer are combined into one, carried out within the components of a single unit.
Principle of thermal deaeration: Steam is used to heat the boiler feedwater to its saturated temperature at the pressure of an atmospheric thermal deaerator (0.018 MPa). At this point, the vapor pressure at the water surface is close to the total pressure at that level, and the partial pressures of various gases dissolved in the water are close to zero. As a result, the feedwater can no longer hold any dissolved gases, and these gases precipitate out, thereby removing oxygen and protecting thermal equipment and pipelines. Basic principle of thermal deaeration: In a container, the amount of gas dissolved in water is proportional to the partial pressure of the gas above the water surface. Based on the dissolution properties of gases in water, to remove any given gas from water, it is sufficient to eliminate that gas from the surface of the water. Therefore, to remove various gases from water, it is ideal for there to be only water vapor on the surface and no other gases. Thermal deoxygenation involves heating water to its boiling point, which reduces the solubility of oxygen and causes it to escape; the oxygen that forms on the surface of the water is then removed, filling the water with steam. In this way, oxygen is continuously removed from the water, ensuring that its oxygen content meets the requirements specified for water quality standards.
It is based on Henry's law and Dalton's law. In a container, the amount of gas dissolved in water is proportional to the partial pressure of the gas above the water surface. The main method used is thermal deoxidation, which involves using steam to heat the feed water, raising its temperature. This increases the vapor pressure of steam at the water surface, while the partial pressure of dissolved gases decreases gradually. As a result, the gases dissolved in the water escape continuously. When the water is heated to its boiling temperature at the corresponding pressure, the water surface is entirely covered with water vapor; the partial pressure of dissolved gases becomes zero, and the water loses its ability to dissolve gases. In other words, all gases dissolved in the water, including oxygen, can be removed.
The principle of thermal deaeration involves using steam to heat the boiler feedwater to its saturated temperature at the pressure of an atmospheric thermal deaerator (0.018 MPa). At this point, the vapor pressure at the water surface is close to the total pressure at that level, while the partial pressures of various gases dissolved in the water are close to zero. As a result, the feedwater can no longer hold any dissolved gases, and these gases precipitate out, thereby removing oxygen and protecting thermal equipment and pipelines.
The principle of thermal deoxidation is based on Henry’s law and Dalton’s law. Henry’s law states that when a liquid and a gas are in equilibrium, at a given temperature, the amount of gas dissolved per unit volume of water is constant. Dalton’s law states that the total pressure of a mixed gas is equal to the sum of the partial pressures of its constituent gases, and this total pressure is proportional to the partial pressure of that gas above the water surface.
Please briefly explain the principle of thermal deaeration. 1. The principle of thermal deoxidation is based on Henry’s law and Dalton’s law. Henry’s law states that when a liquid and a gas are in equilibrium, at a given temperature, the amount of gas dissolved per unit volume of water is constant. Dalton’s law states that the total pressure of a mixed gas is equal to the sum of the partial pressures of its constituent gases, and this total pressure is proportional to the partial pressure of that gas above the water surface. 2. The thermal deaerator (high-efficiency rotary film deaerator) relies on Henry’s law; its design features components consisting of three rotary film elements with different functions, thereby establishing a mass transfer mechanism in the gaseous phase and improving the rotary film technology. 3. The heat and mass transfer mechanism of the rotary membrane deaerator differs from that of the existing liquid column, atomization, and bubbling types; it integrates three mechanisms – jet flow, rotating membrane, and suspended bubbling – into one single heat and mass transfer approach, thereby achieving high efficiency. 4. Replace natural falling film with forced falling film to increase the renewal rate of the liquid film, enabling it to rotate vigorously along the tube wall and draw in a large amount of steam, thereby enhancing heat and mass transfer efficiency ； Changing from counter-current bubbling to suspended bubbling increases the onset of splashing at high steam flow rates within the layer, while maintaining the gas channels ； The three separate modes of heat and mass transfer are combined into one, carried out within the components of a single unit.
As the temperature rises, the solubility of oxygen decreases