oxygen dosing in supercritical boiler
In some cases, the last rinse is treated with chemical to raise the pH to a normal boiler pH range, and the boiler is fired to 180F to 200F so that it can be drained hot and dried out.
Learn More
The standard recommended dosage level is 11 parts per 1 part of oxygen (as O 2). In addition, Erythorbic Acid is a vegetable-derived food preservative, and is a stereoisomer of ascorbic acid (Vitamin C).
Learn More
It can be used in boilers of any pressure, up to and including supercritical (220 bar g), and can be fed into feed-waters used for spray attemperation Catalysed Sodium Sulphite - is an efficient catalysed sodium sulphite product used to absorb oxygen in steam boiler systems.
Learn More
Hitachi, is one of the boiler manufacturers and environmental control system suppliers, had been developing new technologies for power plants including boiler, SCR, AQCS, amine-based scrubbing, oxy-fuel combustion, IGCC with CO2 absorption, and 700°C class advanced ultra supercritical boiler-turbine system, to tackle the issue of
Learn More
All boiler tube and turbine blade failures influenced by cycle water chemistry have the breakdown of the passive protective layer as part of the failure mechanism. If you protect your protective layer 24/7 seven days a week 365 days a year, you will not have boiler or turbine blade failures due to cycle chemistry.
Learn More
Jun 26, 2017 · The theoretical dosage of sodium sulfite (100% purity) is 8 ppm sulfite for every 1 ppm (0.7 cc per liter) of dissolved oxygen. However, correction must be made for the activity or purity of the commercial sulfite, which is about 90%, and for the efficiency of the scavenging reaction.
Learn More
The boiler feedwater is dosed with hydrazine as an oxygen scavenger. To monitor the effectiveness of the hydrazine dosing, a dissolved oxygen monitor is placed at the economiser inlet. This is to check that acceptable levels of dissolved oxygen have been removed (normally to below 5µgkg-1). A hydrazine monitor is also placed at the economiser inlet
Learn More
Modern once-through supercritical units operates under an oxidizing treatment without the addition of an oxygen scavenger and in most cases with the addition of oxygen to the feedwater. During operation these units either operate with their deaerator vents closed or equipped with oxygen feeders at the deaerator outlets.
Learn More
dosage at 5 to 50 cycles only varies from 0.8% to 7.6% of the total required dosage. Changing the residual in the boiler if the deaerator is operating properly can change consumption significantly, but should have little impact on results, unless the deaerator dissolved oxygen level spikes above the 0.01 ppm level.
Learn More
Yuhuan has Chinas first 1,000MW ultra-supercritical pressure boilers. Units 1 and 2 went on line in 2006, and units 3 and 4 in 2007. The site is now generating 22 billion kWh of electricity a year. The plant is operated by China Huaneng Group, Chinas largest power producer.
Learn More
SIPAT OXYGEN DOSING Dosing is being carried out in CPU outlet and Deaerator outlet The cycle oxygen is controlled by flow control valve having a automatic controller. The injection control is automatically adjusted by Feed water flow and residual dissolved oxygen and set point. DO should be in the range of < 20 ppb in condensate.
Learn More
May 05, 2015 · Boiler Chemistry Control and Treatment of Feed Water. In OT Ammonia is used to control pH and remove little Oxygen, but slightly oxidizing environment is maintained to promote formation of oxidizing layer on the metal surface. In supercritical plants as well as in subcritical plants with CPU, after start up Oxygen Treatment (OT) is done.
Learn More
Mar 09, 2016 · 39 OXYGENATED TREATMENT OF FEED WATER Dosing of oxygen(O2) or Hydrogen peroxide (H2O2) in to feed water system. Concentration in the range of 50 to 300 µg/L. Formation of a thin, tightly adherent ferric oxide (FeOOH) hydrate layer. This layer is much more dense and tight than that of Magnetite layer.
Learn More
Superctrical Boiler - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Supercritical boilers
Learn More
An effective internal boiler treatment programme involves the addition of chemicals to the feed water, boiler water and steam in order to confer desirable attributes, or to react with traces of undesirable constituents which can remain after external treatment. Typically, oxygen scavengers, dispersants and alkalinity builders are standard.
Learn More
Boiler Water Treatment Chemicals. A complete water treatment programme for a steam boiler will usually include a chemical oxygen scavenger, alkalinity builder and polymer sludge conditioner and, depending on the application, may also incorporate a phosphate treatment and a condensate line treatment. If you are looking for chemicals only,
Learn More
The application of a fast-acting oxygen scavenger, such as catalyzed sodium sulfite, also helps protect this vital part of the boiler. While oxygen pitting is the most common form of waterside corrosion that causes economizer tube failures, caustic soda has occasionally accumulated under deposits and caused caustic gouging.
Learn MoreAll boiler tube and turbine blade failures influenced by cycle water chemistry have the breakdown of the passive protective layer as part of the failure mechanism. If you protect your protective layer 24/7 seven days a week 365 days a year, you will not have boiler or turbine blade failures due to cycle chemistry.
Learn More
Aug 13, 2009 · In modern boiler systems, dissolved oxygen is handled by first mechanically removing most of the dissolved oxygen and then chemically scavenging the remainder. The mechanical degasification is
Learn More
metal surfaces. It can be used as a direct replacement for hydrazine in any boiler without the associated safety hazards and handling precautions. It can be used in boilers of any pressure, up to and including supercritical (220 bar g), and can be fed into feed-waters used for spray attemperation
Learn More
However, in high-purity water systems, such as is used for supercritical boilers, the controlled addition of oxygen during operation is beneficial as it reduces corrosion product transport to the boiler and subsequently reduces the rate of deposition within the boiler.
Learn More
Jul 23, 2018 · It takes about 1 ppm of hydrazine to remove 1 ppm of oxygen. A properly performing deaerator should get you to less than 10 ppb of oxygen. You want to have an excess of hydrazine of around 50 ppb. So you need 60 ppb added to the feedwater of the boiler.
Learn More
Nov 09, 2017 · Oxygen is used in various points in a thermal power plant. But as I can understand from the question that you might be looking for why oxygen is directly injected inside the stream of water that converts into steam.
Learn More
A boiler's efficiency is directly related to the quality of its feedwater. The feedwater system refers to deaerator, feedwater pumps, and the piping to the boiler. Before water enters the boiler, oxygen must be removed or corrosion can occur throughout the boiler system, forming pits that eat away at the metal. Resulting leaks
Learn More
Jan 25, 2016 · 3. Effect of dissolved oxygen (DO) on high temperature segment. With OT for once-through units, an oxygen level of 30150 ppb is maintained across the whole plant cycle. DO enters the high temperature segments and transports with the coolant, and plays an important role on corrosion in supercritical water (SCW).
Learn More