If the steam and condensate are both saturated at the same pressure, they can be combined.
In fact, every time the trap operates, condensed water and steam pass through the trap at the same time. The volumetric ratio is 3:7 water:steam. it is not just condensed water, but saturated steam and water under this pressure, which are gas and liquid phases.
Only when the pressure and temperature of the gas and liquid phases are different will water impact or cavitation occur due to volume changes.
Thus, the questions raised are feasible.
Boiler water treatment mainly includes feed water treatment (i.e. boiler supplementary water), boiler water treatment condensate (i.e. turbine condensate or condensate water recovered from the process stream), deoxygenation of feed water, additionof ammonia to the feed water and the boiler. 4 part dosage treatment. Make-up water treatment Boiler make-up water volumes vary depending on the purpose of the steam (heating or electricity generation) and the degree of condensate recovery. The feedwater volume of condensing power plant boilers is generally less than 3% of the evaporation capacity, and the feedwater volume of heating boilers can reach 100%. The feed water treatment process is as follows: ① Pretreatment: When the raw water is surface water, the purpose of pretreatment is to remove suspended matter, colloids and organic matter present in water. Usually, a coagulant (such as aluminum sulfate, etc.) is added to the raw water to cause the above impurities to condense into large particles, which sink under their own weight and are absorbed.then filtered in clean water. When groundwater or urban water is used as supply water, pretreatment of raw water can be omitted and only filtration is performed. Commonly used clarification equipment includes pulse, hydraulically accelerated, and mechanically agitated clarifiers; Filtration equipment includes siphon filter, valveless filter and single or double flow mechanical filter. To further remove organic matter from the water, an activated carbon filter can be added. ② Softening: Use natural or artificial ion exchangers to convert hard calcium and magnesium salts into salts that do not form hard scale to prevent the formation of hard calcium and magnesium scale on the inner wall of the boiler tube. For water containing calcium and magnesium bicarbonate and having high alkalinity, it can equalcan be solved by sodium-hydrogen ion exchange method or pretreatment (such as lime addition method, etc.). For some industrial boilers, this treatment generally meets the requirements, although the salt content of the feed water does not necessarily decrease significantly. ③ Salt removal: With the continuous improvement of boiler parameters and the emergence of once-through boilers, it is even necessary to remove all the salt present in the boiler feed water. At this point, salt removal methods should be used. There are many types of ion exchangers used in chemical desalination. The most commonly used are cation exchange resin and anion exchange resin, called "cation resin" and "anionic resin". In the ion exchanger, when the water containing brine passes through the resin, the cations and anions contained in the salt are released.t respectively converted into cations (H) and anions (OH) in the resin and are eliminated. The image shows a schematic diagram of a chemical desalination system commonly used for water supply. When the alkalinity of the water is high, in order to reduce the load on the anion exchanger and improve the operating economy of the system, a decarbonator is usually required in series after the cation exchanger to remove carbon dioxide. Water with particularly high salt content is also Reverse osmosis or electrodialysis processes can be used to desalinate the water first and then enter the ion exchanger for deep desalination. For drum boilers or high pressure once-through boilers and above, traces of silicon in the feed water must also be removed; medium and low pressure boilers are treated according to their content. Treatment of econdensate water: During the circulation process, the condensate water will be polluted by the turbine condenser cooling water + system leakage and corrosion products, and sometimes needs to be treated. The typical treatment process is as follows: Condensate water treatment capacity is related to boiler parameters, furnace type (e.g. whether there is a drum or separator) and contamination condensate water. As boiler parameters increase, the condensate handling capacity usually increases gradually. All supercritical pressure boilers must be treated; the processing volume for ultra high pressure and subcritical pressure boilers is 25-100%; boilers with barrels below high pressure are generally not treated. Commonly used condensation water treatment equipment includes rec filters.open cellulose and electromagnetic filters. After the condensate water has removed the corrosion products (copper oxide, iron oxide, etc.), it then enters the mixed bed or resin powder coated filter for deep desalination. Deoxygenation of Feed Water Dissolved oxygen in boiler feed water can corrode metals in thermal systems. Corrosion products form copper and iron scale in areas of high heat load in the boiler, which deteriorates heat transfer and can even cause pipes to burst or deposit in the high pressure cylinder of the turbine steam, thereby reducing the efficiency of the steam turbine. Thus, the softened or desalinated feed water as well as the condensate water are generally deoxygenated before entering the boiler. Commonly used deoxidation methods include thermal deoxygenationthat and vacuum deoxygenation, sometimes supplemented by chemical deoxidation. So-called thermal deaeration means that when the feed water is heated to boiling point in the deaerator, the solubility of the gas in water decreases, causing the gas to escape from the water and be released into the atmosphere. In terms of working pressure, the most commonly used thermal deaerators are 0.12 MPa and 0.6 MPa. During thermal deoxygenation, the water must be heated to saturation temperature and the surface area of the deoxygenated water must be large (e.g. using a water spray or diffusion device). atomization) so that the escaping gas can be discharged quickly. Vacuum deaeration is often carried out in the condenser of the steam turbine. Chemical deoxidation involves adding hydrazine or sodium sulfite to the feed water to further reduce the oxygen content of the water. The ajout of ammonia to the feed water and adding chemicals to the boiler. Boiler feed water that has undergone feed water treatment, condensate water treatment and feed water deoxygenation is usually required to add ammonia or organic amines in order to increase the pH value of the feed water and avoid any problems. acidic water from corroded metal parts. Drum boilers generally require pot treatment. During treatment, trisodium phosphate or other chemicals are added to the drum to transform salty impurities in the water that can form scale into sludge that can be removed during wastewater discharge to prevent or slow the tartar formation.