Structural principle
Deoxygenation equipment mainly consists of deoxygenation tower head, deoxygenation tank two big pieces and take over and external connections, its main components deoxidizer (deoxygenation tower head) is composed of the shell, vapor separator, the new cyclone (membrane tube), drenching grates, heat storage filler liquid vapor network and other components. Below to you to highlight the deoxidation tower head of the structural principle.
1. Shell: It is made of cylinder body and stamping oval head welding. The medium and small low pressure deaerator is equipped with a pair of flanges to connect the upper and lower parts for assembly and maintenance, and the high pressure deaerator is equipped with a manhole for maintenance.
2. steam and water separator: the device replaces the original old deaerator within the straw hat cone form of structural design, so that the deaerator eliminates the exhaust steam with water phenomenon.
3. rotating membrane device group: by the water chamber, steam chamber, rotating membrane tube, condensate receiver, supplemental water receiver and once into the steam receiver. Condensate, chemical make-up water, through the rotating membrane device was spiral according to a certain angle of spray, the formation of a water film skirt, and with the introduction of primary heating steam receiver heating steam heat exchange, the formation of a primary deoxygenation, feed water through the drenching grate and the rise of the secondary heating steam contact is heated to close to the saturation temperature of the deoxidizer working pressure that is lower than the saturation temperature of 2-3 ℃, and coarse deoxidization. Generally, the rotating membrane section can remove about 90-95% of the oxygen content of the feed water.
4. Drenching grate: is made of several layers of staggered arrangement of angular steel production, by the rotating membrane section of the coarse deoxygenation of the feed water in the second distribution here, was a uniform rain fall to the liquid vapor installed under the network.
5. Thermal storage packing liquid vapor network: It is composed of mutually spaced flat steel bands and a cylindrical body with a certain height of special stainless steel wire mesh inside, where the feed water is fully contacted with the secondary steam, heated to saturation temperature and carried out for the purpose of in-depth deoxidation, with the purpose that the low-pressure atmospheric deoxidizer is lower than 10ug/L, and the high-pressure deoxidizer is lower than 5ug/L (the ministerial standards are 15ug/L and 7ug/L respectively). /L).
6. Water tank in addition to the oxygen of the feed water gathered to the lower container of the deaerator that is the water tank, deaerating water tank is equipped with the latest scientific design of the strong heat transfer and re-boiling device, the device has a strong heat transfer, quickly raise the water temperature, the depth of deaerating, reduce the vibration of the water tank to reduce the accent and other advantages, improve the service life of the equipment to ensure that the equipment operation of the safety and reliability.
Working principle
Condensate and supplementary water firstly enters into the water chamber of the rotating membrane group in the deoxidizing head, and then sprays to the inner hole obliquely from the small hole of the membrane tube under a certain differential pressure of the water level to form a jet, and since the inner hole is full of rising heating steam, the water in the jet movement will be a large amount of heating steam suction and rolled in (the test proves that the jet movement has a rolled suction effect); on the stroke of a very small amount of time, a violent mixed heating effect will be produced, and a large quantity of heating steam will be sucked and rolled in. Produce a violent mixing and heating effect, the water temperature increased substantially, and the rotating water along the membrane tube inside the hole wall continues to rotate, forming a layer of tumbling water film skirt, (water in the rotating flow of the critical Reynolds number down a lot of turbulence that produces a tumbling), at this time, turbulent state of the water heat and mass transfer is the most desirable effect, the water temperature reaches the saturation temperature. Oxygen that is separated out, because oxygen in the hole can not be diffused at will, only rising steam from the exhaust pipe to the atmosphere (the old deaerator although heated water, separated from the oxygen but oxygen specific gravity is greater than the heated steam, part of the oxygen and the downstream water into the tank, is also caused by the deoxygenation effect is poor for a reason). By starting the membrane section of the coarse deoxygenation of the feed water and the introduction of hydrophobic water from the hydrophobic pipe here mixed for the second distribution, was uniformly rained down to the liquid vapor installed under the network, and then the depth of deoxygenation before flowing into the water tank. The oxygen content of the water in the tank is 0-7 цɡ/L for high pressure, and less than 15 цɡ/L for low pressure to meet the operating standards of the Ministry.
Because of the rotating membrane deaerator in the work of the water is always in a turbulent state, and there is a sufficiently large surface area of heat transfer, so the better the heat and mass transfer effect, the small amount of exhaust steam (i.e., with the heating of the steam volume is small, energy loss is small brought about by the economic benefits can be considerable) deaerating effect of a good amount of wealth can make the deaerator overloaded (usually short-term over the rated output of 50%) or low-water temperature of all the water under the water replenishment To achieve the operating standard.