Characteristics of boiler feedwater

Answer 1

In the manufacture of boilers, high purity feed water is required to ensure the proper functioning of the steam generating system. High purity feed water reduces the use of chemicals in the boiler due to less frequent blow downs (reducing the blow down frequency by up to 10 times).A lower purge frequency also translates into lower fuel costs. Descaling is reduced due to the lower concentration of impurities in the boiler feed water, which pollute the heat transfer surface. Lower levels of impurities also reduce the rate of corrosion in the boiler.

When boilers are used to operate steam turbines, erosion of the turbine blades is reduced by the higher purity steam produced. The use of reverse osmosis (RO) in feed water treatment systems reduces chemical costs by reducing the frequency of ion exchange regeneration. A complete system, including reverse osmosis and ion exchange, often results in a more cost effective system than systems that do not use reverse osmosis.

However, the common use of reverse osmosis requires significant use of pre-treatment unit operations, which also adds to the overall cost of the system. Silicate and colloidal deposits reduce the efficiency of the boiler and also cause premature failure of the turbines. Ultrafiltration can remove over 99% of colloidal silica as well as precipitated iron and aluminum. Reducing particulate matter, suspended solids and total organic carbon (TOC) also improves turbine and boiler efficiency.

But the use of conventional membrane technologies has encountered significant membrane clogging problems. Task. Filtration of the boiler feed water allows for optimal downstream performance. A boiler chemicals or power plant to meet the stringent requirements for more efficient boiler efficiency. Solution Technological advances in membrane filtration systems are opening up opportunities for industrial boilers and steam. Power plants to treat boiler feed water streams to meet more stringent system performance requirements.VSEP® or New Logic Research's Vibration Cutting Advanced Processing makes this possible filter incoming water or waste water streams without the clogging problems of conventional membrane systems.

Membrane system significantly reduces TDS, TSS, TOC, color, silica and inlet hardness Sources are taken from city water, well water and river / surface water, which minimizes treatment costs. The purification system uses ultrafiltration (UF), Nano filtration (NF) or reverse osmosis modules to treat the incoming water and create permeable flow meets the boiler feed water criteria for suspended and dissolved solids, silica and hardness. After final polishing with ion exchange resin, the penetrant can be used as boiler feed water. Reverse osmosis filtration can be used if an almost complete removal of dissolved solids is required, and some have started using spiral winding for this work, that is, the final polishing step.

Thus, purification systems can be used to treat boiler water with minimal final polishing with ion exchange resins.This alternative separation process eliminates the need for pretreatment and can significantly reduce the use of regeneration chemicals, thereby reducing the disposal and associated costs of used regenerators.

For industrial boilers and power plant systems, as well as in the cogeneration industry, membrane systems are used.This process can now be used where traditional cross-flow membrane technologies in the past faced significant membrane fouling problems.It is an attractive alternative to traditional filtration methods thanks to its innovative vibration design.

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Answer 2

BOILER FEEDWATER Feed water have a low mineral content, a low chloride content, a low dissolved oxygen content and a pH of above 7-8. As the purpose of the boiler is to evaporate water, the low mineral content is required to avoid continued concentration of minerals such as Calcium and Magnesium Carbonates and Sulphates which will precipitate out as boiler scale. Soluble salts of Sodium and Potassium are also concentrated but these are removed by regularly blowing down. Chlorides and oxygen both cause corrosion of the boiler shell. High pH alters the electrochemical potentials and thereby reduces corrosion. Alkaline sodium phosphate and pyrogallol (oxygen scavenger) was/is used for boiler water treatment and Silver nitrate was used to check for chloride presence. IAN M BARRETT BOILER FEEDWATER Feed water have a low mineral content, a low chloride content, a low dissolved oxygen content and a pH of above 7-8. As the purpose of the boiler is to evaporate water, the low mineral content is required to avoid continued concentration of minerals such as Calcium and Magnesium Carbonates and Sulphates which will precipitate out as boiler scale. Soluble salts of Sodium and Potassium are also concentrated but these are removed by regularly blowing down. Chlorides and oxygen both cause corrosion of the boiler shell. High pH alters the electrochemical potentials and thereby reduces corrosion. Alkaline sodium phosphate and pyrogallol (oxygen scavenger) was/is used for boiler water treatment and Silver nitrate was used to check for chloride presence. IAN M BARRETT

Answer 3

It is the high purity water pumped into the boiler, to replace the water that is turned into steam.