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sodium carbonate to control slag in a boiler

Water Handbook -Boiler Deposits: Occurrence And Control SUEZ

Sodium carbonate treatment was used to precipitate calcium as calcium carbonate to prevent the formation of calcium sulfate. The driving force for the formation of calcium carbonate was the maintenance of a high concentration of carbonate ion in the boiler water. Even where this was accomplished, major scaling by calcium carbonate was common.

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ALKALINITY CONTROL - Guardian CSC

In an emergency, increase the blow down rate if necessary to bring boiler water alkalinity under control. Sodium hydroxide is the preferred approach, as the break down components does not form carbon dioxide. Carbon dioxide will carry off the steam and form carbonic acid in the condensate return lines.

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Sodium Carbonate To Control Slag In A Boiler, Hot Products

Sodium Carbonate To Control Slag In A Boiler. Whatever your requirements, you 'll find the perfect service-oriented solution to match your specific needs with our help.We are here for your questions anytime 24/7, welcome your consultation. Pdf using of congruent phosphate as equilibriumpdf using of congruent phosphate as equilibrium21 carbonate control phosphate control was derived to prevent ...

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The Effects of Corrosion in a Boiler Chardon Labs

Sodium carbonate can convert into sodium hydroxide through hydrolysis. The latter compound reacts with iron in the boiler, dissolving it and producing sodium ferrate. This product then undergoes hydrolysis again, converting back to sodium hydroxide, continuing the process.

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Using of congruent phosphate as equilibrium phosphate ...

Sodium carbonate treatment was used to precipitate calcium as calcium carbonate to prevent formation of calcium sulphate. As boiler temperature and pressure rose to produce more power, the calcium carbonate scale becomes unacceptable due to tubes overheating and

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Four Boiler Contaminants that Jeopardize Power Plant ...

14/02/2014  A particular problem with sodium is the cycle it undergoes during hydrolysis. During this process, sodium carbonate is turned into sodium hydroxide, which then attacks iron in the boiler.

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Performance of magnesia-modified sodium carbonate ...

Sodium carbonate-activated slag/fly ash (NC-SF) binders has recently evolved as a potentially more sustainable binding materials than both Portland cement and conventional alkali activated materials such as sodium silicate and sodium hydroxide activated materials. The reaction mechanism and some microstructural properties of NC-SF cements have been a major area of research recently. However ...

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Feed Water Treatment to Avoid Corrosion

Sodium Sulfite decomposes on heating and is prepared from sulfur dioxide and sodium carbonate or caustic soda. Sodium Sulfite is an effective scavenger for use in systems operating below 1000 psi. For pressures above 1000 psi breakdowns may form corrosive Hydrogen Sulfide and/or Sulfur Dioxide.

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Process for slag and corrosion control in boilers - Justia

12/10/2006  A slag and corrosion control process is described. The process entails: identifying the location of at least one slagging problem area in a boiler; introducing a slag control chemical comprising magnesium oxide or hydroxide into combustion gases in a location identified as having a slagging problem; identifying the location of at least one corrosion problem area in a boiler; and introducing a ...

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Refractories by Sodium Carbonate - MDPI

Corrosion of the refractory material by sodium salts in a waste liquid boiler. A large number of scientists studied the influence of additives on the corrosion resistance of refractories. Some of the researchers found that additive could significantly improve the slag corrosion resistance [12 16]. Presently, new anti-sodium corrosion refractories have been studied by changing the ratio of ...

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ALKALINITY CONTROL - Guardian CSC

Sodium hydroxide and/or sodium carbonate may be present as excess treating chemicals in the effluent from a lime-soda softener; the use of such pre-treating equipment automatically provides the alkali required for alkalinity control in the boiler water. Most raw waters contain bicarbonate (HCO-). So does effluent waters from sodium cycle and from most sodium-acid cycle zeolite softeners. Under ...

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Sodium carbonate activated slag as cement replacement in ...

01/06/2017  The dosage of sodium carbonate (expressed as equivalent Na 2 O wt%) was calculated by the mass of slag. To ensure the mechanical properties of the reaction product, dosages of sodium carbonate between 4 and 8 Na 2 O wt% by mass of slag were chosen and the water to solid ratio was kept the same as the reference. However, the produced alkali activated materials were too viscous,

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Four Boiler Contaminants that Jeopardize Power Plant ...

14/02/2014  A particular problem with sodium is the cycle it undergoes during hydrolysis. During this process, sodium carbonate is turned into sodium hydroxide, which then attacks iron in the boiler

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The Effects of Corrosion in a Boiler Chardon Labs

Sodium carbonate can convert into sodium hydroxide through hydrolysis. The latter compound reacts with iron in the boiler, dissolving it and producing sodium ferrate. This product then undergoes hydrolysis again, converting back to sodium hydroxide, continuing the process. Joints and bends are especially susceptible to this type of damage from sodium in the water. While reusing as much ...

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Solutions - Fuel Tech Inc

In addition to the application of TIFI for SO 3 control, Fuel Tech can combine this approach with the injection of trona or other sodium based sorbents such as sodium bi-sulfite (SBS) or sodium carbonate/bi-carbonate into the duct downstream of the economizer or air heater. Systems designed for the injection of dry magnesium hydroxide or dry hydratell lime are also available. Fuel Tech will ...

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Effect of sodium carbonate/sodium silicate activator on ...

01/03/2019  At early stage, the formation of calcium carbonate and sodium-calcium carbonate phases occurs as a result of reactions between the calcium ions released from slag and dissolved carbonate ions of Na 2 CO 3 present in the pore solution on one hand while silicate and aluminate ions released by the dissolution of the slag react separately with the sodium of activator to form zeolite NaA .

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Understanding recovery boiler smelt runoff phenomena

In the recovery boiler, the inorganic elements in the incoming black liquor are converted to a mixture of molten salts (primarily sodium carbonate and sulfide).

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How to Remove Industrial Steam Boiler Scale?EPCBboiler

EPCB oil/gas fired steam boiler, with 3-pass wet back structure, equipped with automatic control system, is easy to operate, fully saves manpower costs, installs high-efficiency economizer, saves fuel costs, and is widely used in textile, printing and dyeing, food, chemical industry, medicine and

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DEPOSIT CONTROL FOR A BLACK LIQUOR RECOVERY BOILER -

One established technology for achieving effective slag control in some black liquor recovery boilers is described in U.S. Pat. No. 5,740,745 to Smyrniotis, et al.; however, due to the way combustion occurs in a black liquor recovery boiler, there appears to be a unique set of requirements for introducing slag control chemicals. Because of internal structural variations among boilers, the flow ...

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ALKALINITY CONTROL - Guardian CSC

Sodium hydroxide and/or sodium carbonate may be present as excess treating chemicals in the effluent from a lime-soda softener; the use of such pre-treating equipment automatically provides the alkali required for alkalinity control in the boiler water. Most raw waters contain bicarbonate (HCO-). So does effluent waters from sodium cycle and from most sodium-acid cycle zeolite

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An overview of problems and solutions for components ...

21/12/2017  It takes place in the hottest parts of the boiler. Slag is formed when molten softened ash particles are not cooled to ... In the boiler, when the water evaporates, the concentration of sodium carbonate increases. Sodium carbonate is used for the softening of water via. lime soda process. During this process, there are chances that some of the sodium carbonate

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2-1 Recausticizing - Principles and Practice

Sodium Carbonate (Na2CO3) - This is the main constituent of the smelt generated in the recovery boiler. Dissolving the smelt in water (weak wash) produces Green liquor Calcium Carbonate (CaCO3) (Lime Mud) - Produced by slaking Quick Lime in Green Liquor. Figure 1- A simple diagram of the recausticizing flowsheet LIME GRIT DREGS WHITE LIQUOR WATER

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Using of congruent phosphate as equilibrium phosphate ...

2.1 Carbonate control Before the acceptance of phosphate treatment in the 1930’s, calcium sulphate scaling was a major boiler problem. Sodium carbonate treatment was used to precipitate calcium as calcium carbonate to prevent formation of calcium sulphate. As boiler temperature and pressure rose to produce more power, the calcium carbonate scale

More

The Effects of Corrosion in a Boiler Chardon Labs

Sodium carbonate can convert into sodium hydroxide through hydrolysis. The latter compound reacts with iron in the boiler, dissolving it and producing sodium ferrate. This product then undergoes hydrolysis again, converting back to sodium hydroxide, continuing the process. Joints and bends are especially susceptible to this type of damage from sodium in the water. While

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Refractories by Sodium Carbonate

Refractories by Sodium Carbonate Ying Zhao 1,*, Guishi Cheng 1, Yu Xiang 1, Fei Long 2 and Changqing Dong 1 1 National Engineering Laboratory for Biomass Power Generation Equipment, School of the Renewable Energy, North China Electric Power University, Beijing 102206, China; [email protected] (G.C.); [email protected] (Y.X.); [email protected]

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Performance of Magnesia-modified sodium carbonate ...

Sodium carbonate-activated slag/fly ash (NC-SF) binders has recently evolved as a potentially more sustainable binding materials than both Portland cement and conventional alkali activated materials such as sodium silicate and sodium hydroxide activated materials. The reaction mechanism and some microstructural properties of NC-SF cements have been a major area of

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Internal Feedwater Treatment and Testing Methods

hydroxide, sodium carbonate, sodium phosphate and sodium aluminate. Sludge Conditioning The sludge that is produced by the precipitating of the scale forming compounds in the boiler must be conditioned so that it will stay fluid and well dispersed. In this way the sludge will be easily removed from the boiler through the blowoff connections. The chemicals used for this

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DEPOSIT CONTROL FOR A BLACK LIQUOR RECOVERY BOILER -

One established technology for achieving effective slag control in some black liquor recovery boilers is described in U.S. Pat. No. 5,740,745 to Smyrniotis, et al.; however, due to the way combustion occurs in a black liquor recovery boiler, there appears to be a unique set of requirements for introducing slag control chemicals. Because of internal structural variations among boilers

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AP-42, CH 8.12: Sodium Carbonate

8.12 Sodium Carbonate 8.12.1 General1-3 Sodium carbonate (Na2CO3), commonly referred to as soda ash, is one of the largest-volume mineral products in the U. S., with 1991 production of over 9 million megagrams (Mg) (10.2 million tons). Over 85 percent of this soda ash originates in Wyoming, with the remainder coming from Searles Valley, California. Soda ash is used mostly

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sodium carbonate to control slag in a boiler – Grinding ...

Drilling and cementing with blast furnace slag/soluble/insoluble Oct 25, 1994 A composition suitable for drilling and cementing comprising blast furnace slag, lithium carbonate, sodium slag tends to reduce fluid loss control. » More detailed. calcium chloride manufacturing process from waste slag-Shanghai slag milling ...

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Boiler Water Treatment - Home The Association of Water ...

• SODIUM Na+ • ... 3 = • SULFATE SO 4 = • CARBONATE CO 3 = • ... Modulating control is expensive, prevents loss of gas deaeration Feed Water and Tray Deaeration Feed Water is make up water plus condensate. This blending occurs in the feed water tank or a deaerator. Controlled heat should be added to reduce thermal shock and drive off the dissolved gasses. Tray Type Makeup Deaerator ...

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US4874541A - All-in-one boiler water treatment composition ...

An all in one boiler water treatment composition includes an oxygen scavenging system, an alkalinity control agent such as sodium carbonate, diethylaminoethanol as a condensate treatment, a polymer system including polymethacrylate or polyacrylate and polymaleic acid along with an oxygen scavenging system. The oxygen scavenging system includes the diethylaminoethanol, a polyhydroxy acid and a ...

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Performance of magnesia-modified sodium carbonate ...

Sodium carbonate-activated slag/fly ash (NC-SF) binders has recently evolved as a potentially more sustainable binding materials than both Portland cement and conventional alkali activated materials such as sodium silicate and sodium hydroxide activated materials. The reaction mechanism and some microstructural properties of NC-SF cements have been a major area of research recently. However ...

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CORROSION PROTECTION OF CONDENSATE SYSTEMS

Sodium Water Sodium Carbon Carbonate Hydroxide Dioxide Gas These equations show that 2 molecules of sodium bicarbonate in the feedwater are a potential source of 2 molecules of carbon dioxide in the condensate. Equation #3 illustrates that since soda ash (i.e., sodium carbonate) is also a source of carbon dioxide, sodium hydroxide (i.e., caustic soda) should be used for boiler water pH control ...

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Boiler Water Treatment Sodium Chloride Sodium Hydroxide

Control of sludge formation within the boiler. Boiler Feedwater Treatment ... Sodium carbonate, with sludge conditioning agents and anti-foams in the approximate proportions of 3, 4 and 1 by weight respectively. For high-pressure boilers a stricter regime is required, with more control over the reserves of chemical and separate chemicals are usually supplied. Alternative Sources The ...

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Water Treatment Requirements for Low and Medium Pressure ...

27/04/2015  Alternatively, sodium carbonate (Na2CO3, aka soda ash) may be used. This product is available as a 99% active powder having a 58% Na2O content. Soda ash reacts under boiler temperature and pressure to produce sodium hydroxide and free carbon dioxide. This has the disadvantage of increasing the carbon dioxide content of the steam, which, in turn, results in the

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Chemical acceleration of a neutral granulated blast ...

furnace slag activated using sodium carbonate. As strength development of alkali-activated slag cements containing neutral GBFS and sodium carbonate as activator at room temperature is known to be slow, three accelerators were investigated: sodium hydroxide, ordinary Portland cement and a combination of silica fume and slaked lime. In all cements, the main hydration product is C–(A)–S–H ...

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Process for slag and corrosion control in boilers - Fuel ...

A slag and corrosion control process is described. The process entails: identifying the location of at least one slagging problem area in a boiler; introducing a slag control chemical comprising magnesium oxide or hydroxide into combustion gases in a location identified as having a slagging problem; identifying the location of at least one corrosion problem area in a boiler; and introducing a ...

More

DEPOSIT CONTROL FOR A BLACK LIQUOR RECOVERY BOILER

01/08/2017  One established technology for achieving effective slag control in some black liquor recovery boilers is described in U.S. Pat. No. 5,740,745 to Smyrniotis, et al.; however, due to the way combustion occurs in a black liquor recovery boiler, there appears to be a unique set of requirements for introducing slag control chemicals. Because of internal structural variations among boilers, the flow ...

More