The problem each heating system - the presence in water of oxygen and anions, which seriously shorten the lifetime of heat networks. To increase this time, the water before you get into the system, undergoes a process of deaeration in the deaerator, in which the water removed from the oxygen and anions. This process increases the resistance of metal to corrosion - ultimately extending the service life of heat networks.
In order to reduce the amount of oxygen in the water is just enough to heat the liquid, but in order to remove all the oxygen necessary to bring the water to a boil. So here is a device in which water is brought to a boil, called a deaerator. Heating the liquid to a boil in the deaerator is due to the steam from the turbine. In order to completely remove various gases from the water, she should warm up to the saturation temperature, since even small underheating of water at 1-4 °C leads to an increase of residual gas in the water. For effective de-aeration process is necessary to continuously remove the gases released in the process of boiling water. To this end, the deaerator exhaust steam and gas provided by the special part. This process is called heaving. The more heaving of the deaerator, the better it will work.
Types of deaerators: surface, mixed and superheated water. With nailuchshimi performance and reliability, the highest prevalence of mixed deaerators.
Types of deaerators to the principle of pressure: atmospheric, vacuum deaerators and high pressure.
Set on the lines, which is used to supply the incremental water.
Set the backfeed of calorific nets.
The deaerator high blood pressure.
Set on the main thread-forming condensate.
The device of deaerator vent is a column where heated water flows from the top down and from the bottom towards the heating steam is supplied. Deaerating column installed in tank battery feed water, which is in the process and drains the water subjected to the de-aeration process. Figuratively speaking, the work of the deaerator is a collection of columns, the vent and the vent of the tank on which they are installed.
The water level in deaerator (vacuum, atmospheric) must be fixed and controlled. If the water level increase, it should automatically drain through the overflow device. Because when you raise the water level deteriorates the process of deaeration. Pressure in atmospheric deaerator and vacuum deaerator should be constant. A sharp increase or decrease of pressure in the system leads to disruption of the operation of the pumps of the deaerator.
Major cities of shipment of deaerators: Moscow, Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod, Kazan, Samara, Omsk, Chelyabinsk, Rostov-on-don, Ufa, Volgograd, Krasnoyarsk, Perm, Voronezh, Saratov, Krasnodar, Tolyatti, Barnaul, Ulyanovsk, Tyumen, Izhevsk, Irkutsk, Vladivostok, Yaroslavl, Khabarovsk, Makhachkala, Orenburg, Novokuznetsk, Tomsk, Kemerovo, Ryazan, Astrakhan, Penza, Naberezhnye Chelny, Lipetsk, Tula, Kirov, Cheboksary, Kaliningrad, Kursk, Ulan-Ude, Stavropol, Magnitogorsk, Yaroslavl, Ivanovo, Tver, Belgorod, Nizhniy Tagil, Arkhangelsk.
We supply deaerators to Kazakhstan in the following cities: Almaty, Shymkent, Karaganda, Taraz, Astana, Pavlodar, Ust-Kamenogorsk, Semipalatinsk, Aktobe, Uralsk, Kostanay, Petropavlovsk, Temirtau, Kyzylorda, Aktau, Atyrau, Ekibastuz.
Deaerators in Belarus are: Minsk, Gomel, Mogilev, Vitebsk, Grodno, Brest, Bobruisk, Baranovichi, Borisov, Orsha.
Everyone knows that water contains air, and the process of aeration allows you to remove the air from the water. For example, in heating systems the presence of oxygen in the water and anions seriously reduces their service life. To increase this time, the water before you get into the system, undergoes a process of deaeration in which the water removed from the oxygen and anions. This increases the resistance of metal to corrosion, and ultimately extends the service life of heat networks. In order to reduce the amount of oxygen in the water is just enough to heat the liquid, but in order to remove all the oxygen necessary to bring the water to a boiling state. A device in which water is brought to a state of boiling, called a deaerator. Heating the water to a boil in the deaerator is due to the steam from the turbine. In order to completely remove any possible gases from the water, it definitely needs to warm up to the saturation temperature. Because even a slight underheating of water 1-4 °C leads to an increase of residual gas in the water. For effective de-aeration process need to constantly remove the gases that are released in the process of boiling water. To this end, the deaerator there is a special steam-gas exhaust part, this process is called heaving. The more heaving of the deaerator, the more effective his work is. Deaerators come in different types. And divided according to the principle of pressure: atmospheric, vacuum and high pressure deaerators. Atmospheric deaerators are installed on the lines that supply the incremental water. Vacuum on the backfeed of calorific nets, high blood pressure - on the main thread-forming condensate. The device is aboutearlier de-aerator column where heated water flows from the top down. From the bottom towards the heating steam is supplied.Deaerating column is mounted in the tank battery of the feed water, which in the process flows and water subjected to deaeration. In General, operation of the deaerator is a collection of columns, the vent and the vent of the tank on which they are installed. For the most efficient process of deaeration in deaerator mixed type increase the contact surface of the heated water from the steam. Thermal de-aerators by means of the crushing waters are divided into film, nozzle, nozzles, jet, and bubble. The most widely jet deaerators. In order to increase the surface contact of water with the steam, deaerator with a slender deaeration can be combined with bubbling. This allows the most effectively remove gases from water.
Capacity of deaerator tanks is selected from the calculation of the three-minute work of feed pump after the cessation of water flow into the deaerator. The water level in the deaerator should be specified and monitored with the help of a water gauge glass. When reaching the maximum permissible level, the excess water drained through the overflow device. Increase over the maximum allowable degrade the performance of the ventilation column. The pressure in the deaerator is necessary to maintain a constant. This is due to the fact that after the deaerator water heated to the saturation temperature, nutrient pump in the nutrient line and then to the drum separator. The sudden change of pressure in the deaerator can occur boiling water, and the pump is broken. When the load changes on the turbine steam pressure at extractions change, change and pressure in the deaerator. If the turbine has adjustable steam extraction, the de-aerator should be connected to this selection. Adjustable steam extraction from turbine power plant, as a rule, are absent. To ensure constant pressure in the deaerator steam is connected to multiple turbines. The constancy of the pressure in the deaerator will disturb the optimal heating of feed water in degrees. But when underheating of the water going to the deaerator, at 8-10 °C the effect is negligible, and heated in the deaerator can be considered as a General heating level, the more that they eat from the same steam extraction.
The deaerator can act in other threads, the pressure above the water is determined by the saturated vapor pressure of water vapor and condensate. In the deaerator single-circuit NPP merges the condensate of the heating vapor of the intermediate superheaters turbine. Through the deaerator can also conduct a cooldown of the primary circuit of the reactor, if the discharge of fresh steam into the deaerator to establish the technological condenser. In addition, on all types of nuclear power plants in accordance with the Rules of technical design installation of a 100% purification of turbine condensate is required. This means that all the impurities coming from the flowing cooling water in the condenser, including bicarbonates, will be removed on ion-exchange filters condensate refining. The appearance of carbon dioxide eliminated, oxygen, as already stated, is partially removed in the deaerating device of the capacitor. In addition, oxygen in high purity water with conductivity less than 0.3 MCCI/cm performs a positive function. When interacting with carbon steels the oxygen forms a protective oxide film that reduces corrosion and removal of corrosion products into the water. Corrosion of brass alloy in the presence of oxygen even in water of high purity is not reduced. The absence of a deaerator simplifies the thermal design of nuclear power plants, however, there are some problems, in particular, to the sink drains heating vapor PVD, collection of secondary flows of steam and condensate receiver which is the deaerator. If there is a need to avoid de-aeration, this can be done in circuit with the deaerator, blocking the line for the discharge of flash steam. Betzdearborn scheme yet not a single nuclear power plant unit is not implemented.