How does a rotary diaphragm deaerator work? 20

Principle. 1.Shell: It is welded by barrel body and stamped oval head. The medium and small low-pressure deaerators are equipped with a pair of flange connections for assembly and maintenance, and the high-pressure deaerator is equipped with a manhole for maintenance.

2.Rotary membrane group: It is composed of a water chamber, a steam chamber, a rotary tube, a condensate pipe, a supplementary water pipe and a primary steam inlet pipe.

Condensate, chemical water replenishment, spiral sprayed out at a certain angle through the film spinner, forming a water film skirt, and heat exchange with the heating steam introduced by a heating steam to take over, forming a deoxygenation, the feed water is heated to a saturation temperature close to the working pressure of the deaerator that is lower than the saturation temperature 2-3, and crude deoxygenation is carried out. Generally, about 90-95% of the oxygen content in the feed water can be removed through this rotary membrane section.

3.Water grate: It is composed of several layers of staggered angular steel, and the feed water that is coarsely deoxygenated through the rotating membrane section is redistributed here, and falls to the liquid vapor net installed under it in the form of uniform rain.

4.Regenerative packing liquid vapor mesh: It is composed of flat steel strips and a cylindrical body, which is equipped with a certain height of special stainless steel wire mesh, where the feed water is in full contact with the secondary steam, heated to saturation temperature and carried out deep deoxygenation, low-pressure atmospheric deaerator is less than 10ug l, high-pressure deaerator is less than 5ug l (ministerial standards are 15ug l, 7ug l).

5.The feed water of the water tank deoxygenation is collected into the lower container of the deaerator, that is, the water tank, and the deoxygenation water tank is equipped with the latest scientific design of the powerful heat exchange and re-boiling device, which has the advantages of strong heat exchange, rapid increase of water temperature, deeper deoxygenation, reduction of water tank vibration, reduction of accent, etc., which improves the service life of the equipment and ensures the safety and reliability of the operation of the equipment.

Hehe, I work in a power plant, and the deaerator is a utility system. The working principle of the high-pressure rotary membrane deaerator is to pass the steam with stable pressure into the deaerator to heat the water, and in the heating process, the partial pressure of the water vapor on the water surface gradually increases, and the partial pressure of other gases gradually decreases, and the gas in the water is continuously separated and pre-empted. When the water is heated to the saturation temperature under the pressure of the deaerator, the space on the water surface is filled with water vapor, and the partial pressure of various gases tends to zero, at which point the oxygen and other gases in the water are removed.

The working principle of the deaerator is:The condensate and supplementary water first enter the water chamber of the inner spinning membrane group of the deaeration head, and spray obliquely from the small hole of the membrane tube to the inner hole under a certain water level difference pressure to form a jet, because the inner hole is filled with rising heating steam, the water will suck a large amount of heating steam into it in the jet movement (the test proves that the jet movement has the effect of coiling and suctioning);

In a very short period of time and a small stroke, the water temperature is greatly increased, and the rotating water continues to rotate down along the inner hole wall of the membrane tube, forming a tumbling water film skirt, (the critical Reynolds number of the water in the rotating flow decreases a lot, that is, turbulent tumbling), at this time, the water heat and mass transfer effect in the turbulent state is the most ideal, and the water temperature reaches the saturation temperature. The oxygen is separated, because the oxygen cannot be diffused at will in the inner hole, and the rising steam can only be discharged from the exhaust pipe to the atmosphere (although the old deaerator heats the water and separates the oxygen, the specific gravity of oxygen is greater than that of the heated steam, and part of the oxygen is brought into the water tank by the downstream water, which is also a reason for the poor deoxygenation effect).

The feed water that has been coarsely deoxygenated by the membrane section and the water introduced by the trap pipe are mixed here for secondary distribution, and fall into the liquid vapor net installed under it in a uniform rain-like manner, and then flow into the water tank after deep deoxygenation. The oxygen content of the water in the tank is 0-7 ɡ l at high pressure, and less than 15 ɡ l at low pressure, which meets the operating standard issued by the ministry.

The working principle of the deaerator is that the water is sprayed out in a spiral shape through the membrane pipe and the heating steam is sprayed at a certain angle for heat exchange and deoxygenation, and the feed water is heated to the saturation temperature under the corresponding working pressure of the deaerator, so as to remove the oxygen and other gases dissolved in the feed water, and prevent and reduce the corrosion of the boiler feed pipe, economizer and other ancillary equipment.

Because the rotary membrane deaerator always keeps the water in a turbulent state during the work, and has a large enough heat exchange surface area, the better the heat and mass transfer effect, the smaller the exhaust steam (that is, the amount of steam used and heated is less, and the economic benefits brought by the small energy loss are also considerable), the rich amount generated by the good deaeration effect can make the deaerator overload the operation (usually 50% of the rated output in the short term) or meet the operation standard under low water temperature and full water replenishment.

The main function of the deaerator is to remove the oxygen in the feed water and ensure the quality of the feed water. When oxygen is dissolved in water, it corrodes the metal that comes into contact with the water; If there is gas accumulation in the heat exchanger.

It will hinder the heat transfer process and reduce the heat transfer effect of the equipment. Therefore, any gas dissolved in the water is unfavorable, especially oxygen, which will directly threaten the safe operation of the equipment.

The deaerator itself is a hybrid heater in the feed water recuperation system, and at the same time, the hydrophobic, chemical water replenishment of the high-pressure heater and the hydrophobic and exhaust gas with qualified water quality throughout the plant can be passed into the deaerator and used to reduce the loss of steam and water in the power plant. When water comes into contact with a gas mixture, some of the gas melts into the water. The solubility of a gas is the amount of gas dissolved in water, measured in milliliters, which is related to the type of gas and its partial pressure on the surface of the water, and the temperature of the water.

At a certain pressure, the higher the temperature of the water, the less solubility of the gas; Conversely, the greater the solubility of the gas. At the same time, the higher the partial pressure of the gas on the water surface, the greater its solubility, and vice versa, the lower its solubility. Natural water often.

Contains a large amount of dissolved oxygen, up to 10 milligrams of liters. The condensate of the steam turbine may contain a large amount of oxygen because the air can penetrate through the loose parts of the equipment in a vacuum. In addition, the make-up water also contains other gases such as oxygen and carbon dioxide.

The full pressure of the gas mixture on the liquid surface includes the partial pressure of the liquid vapor. When water is heated, the partial pressure of water vapor near the liquid surface increases, and the partial pressure of other gases near the liquid surface decreases. When the water is heated to the boiling point, the partial pressure of the steam will be close to the full pressure on the liquid surface.

Current oxygen removal: filter material filtration and oxygen removal; thermal spray deoxygenation; Analytical oxygen removal; Membrane deoxygenation.

The working principles are different, and the specific ones should be introduced to you by their own manufacturers, but this is generally given you a general introduction.

According to Henry's law: the concentration of a certain gas dissolved in water is proportional to the partial pressure of the gas on the surface of the gas and liquid, if the water is heated to boiling, the surface of the gas and liquid is almost 100% water vapor, and at the same time, the original dissolved in the water and other gases such as oxygen will escape from the water, as long as the water is divided into small enough water droplets and the gas on the liquid surface is pumped out in time, the oxygen and other dissolved gases in the water can be removed, and the escaped gas will not be re-dissolved in the water. The deaerator heats the water (with steam) to the boiling point at this pressure, and continuously extracts the escaping gases to achieve the purpose of oxygen removal (in fact, the removal of all dissolved gases).

Basis: Dalton's principle of partial pressure (the total pressure of an ideal gas mixture is the sum of the partial pressures of each component gas) and Henry's theorem (at a certain temperature, the saturation concentration of a gas in a liquid is proportional to the equilibrium partial pressure of the gas on the liquid surface), so the prerequisite is to heat the water to a saturation temperature at the corresponding pressure.

Hello, I personally recommend that you go directly to the local store for on-the-spot consultation, and what you understand by yourself is the most real.