Boiler and HRSG Tube Failures - Lesson 6 Acid Phosphate
HOT
Capacity:1-20t/h
Rated thermal efficiency: 100-104%
Fixed working pressure: ≤1.6MPa
Applicable fuel:natural gas etc.
HOT
Capacity:0.7-14MW
Rated thermal efficiency:96-98%
Fixed working pressure:≤1.25MPa
Applicable fuel:Natural gas, light oil, etc.
HOT
Capacity:0.7-2.8Mw
Rated thermal efficiency: 97.2-106%
Fixed working pressure:0.1MPa
Applicable fuel:Natural gas, etc.
HOT
Capacity:2.8-7.0Mw
Rated thermal efficiency:≥105.5%
Fixed working pressure:-0.02MPa
Applicable fuel:Natural gas, etc.
HOT
Capacity:99Kw
Rated thermal efficiency:97.2-104.4%
Fixed working pressure:1.0MPa
Applicable fuel:Natural gas, etc.
HOT
Capacity:0.5-4.0 t/h
Rated thermal efficiency:98%
Fixed working pressure:≤1.25MPa
Applicable fuel:electric energy
Jun 04, 2020 · Comment is necessary regarding phosphate. For decades, tri-sodium phosphate (Na 3 PO 4) has been a core boiler water treatment chemical in many drum units. However, control of the phosphate concentration is difficult due to the compound's reverse solubility, aka "hideout," above 300°F.Get Price
Root cause and mechanism of the boiler failure. Generally, it was reported that there are three under deposit corrosion namely: (1) hydrogen damage, (2) …Get Price
Jun 24, 2014 · That oxygen comes out of solution as the water boils, and it can eat holes in the boiler, right at the boiler's waterline. If you decide to feed with hot water instead of cold water, the minerals in the water will come out of solution on the automatic water-feeder's seat, and that can cause a flood, especially if it's a one-pipe-steam system.Get Price
Aug 12, 2016 · The Terry Bundy N 2 generator supplies 5-psig nitrogen to the low-pressure and high-pressure drums during wet layups; the nitrogen also serves to "push" water from an HRSG during dry layup draining. A nitrogen pressure of 5 psig is maintained during the dry layup, provided no major tube work is required. An obvious major concern with nitrogen blanketing — …Get Price
Acid Conductivity Conductivity of a water sample after passage phosphate compound or blend of compounds to the boiler water UDC Boiler/HRSG tube failure mechanism Water Treatment Plant WTP Facility where high purity water is prepared and stored . 5 2. Introduction: Purpose of Document and How to Use itGet Price
How to Alleviate Waterside Issues in Boilers and HRSGsGet Price
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The tube failure occurred on June 2011, 5 tubes were cracked and leaked cause very high conductivity of condensate and low pH of boiler water (<6.0 for more than 4 hours). This tube failure has forced the plant to have unscheduled shutdown for 2 days.Get Price
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PPChemPPChem 101 – Boiler and HRSG Tube Failures sure parts of the HSRG, subsequently deposit in water- walls (conventional boilers) and in the HP evaporator tubing (HRSGs). These heavy deposits are the locators of the under-deposit corrosion mechanisms and thus of acid phosphate corrosion.Get Price
• influences about 50% of the boiler tube failures (BTF) • influences about 70% of the HRSG tube failures (HTF) • influences/controls every one of the main damage mechanisms in the steam turbine except liquid droplet erosion • has a major influence on condenser tube and feedwater heater tube failures.Get Price
Examination of Water-Formed Deposits in Steam Boilers by Scanning Electron Microscopy. August 2002; Microscopy and Microanalysis 8(S02):810-811Get Price
Boilers. 2 GE Title or job number 6/10/2014 Greater reliability Less downtown costs . 4 / GE / Compromised boiler efficiency . Overheating tube failure due to scale 5 From 600 psig boiler . Metal oxide-induced overheating & under deposit corrosion From 400 psig boiler . - Acrylic acid plus two unique monomers • Two unique, sulfonated Get Price
Answer (1 of 10): Boiler Scale Inhibitors Boiler water chemical treatment is necessary to prevent or control scale and deposit formation. The formation of scale and sludge can cause tube failures, restrict circulation, reduce system efficiency, and …Get Price
How to Alleviate Waterside Issues in Boilers and HRSGsGet Price
6.6 Units not Pre-Operationally "Acid" Cleaned 24 6.7 Other Aspects that need Consideration in Understanding HP HRSG Tube Failure HTF Once-through boiler or HRSG mechanisms: hydrogen damage [11], acid phosphate corrosion [12] and caustic gouging [13]. All three mechanisms require significant deposits on the internal surfaces of the HPGet Price
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E -1112 T i C ond/ Feed P r eheater M P / HP / HHP s team 1 H N 1.05 0.1 10. 55 0.7 7.35 6Y V I & HT SD/ I 5/ 1/ 07 C ombined P i pi ng C L-021-212 Demi n Water P i pi ng Demi ner al i s ed Water 1 M N 0.25 0.01 25 0.6 15 6Y UT T M OS/ NI 1/ 1/ 04 F-4101 T o GT Gener ati ng tubes Fl ue Gas 1 VH H 0.25 0.01 25 0.5 12.5 3Y V I, UT T M & HT SD/ I Get Price
Battling Fatigue: Failure Mechanisms and Assessment Methods for Boilers and Heat-Recovery Steam Generators . Cycle chemistry conditions continue to be a primary cause of operational problems and component failures in the water-steam cycles of conventional pulverized-coal (PC) boilers and the heat-recovery steam generators (HRSGs) of combined-cycle (CC) units fueled …Get Price
13 Extensive boiler tube caustic corrosion (Figure 5) in high pressure drum boiler during one year at MCR/overpressure [6] High heat flux at MCR not compatible with phosphate boiler water control Replaced tubes, changed to AVT 14 Overheat failures of superheater tubes within one month of operation High boiler carry-over andGet Price
Feb 02, 2010 · HRSG Boiler Tube Repair Thursday, April 17, 2008 - 1169 Views My company owns/operates several large thermal plants, and a common problem is in the repair of combined cycle boiler tubes. While cut-in-weld-out is fairly standard, we are looking for a better way. Get Price
Conclusion: Micro examination indicates several rounded pits filled with oxides on the ID surface of the tube. The failure is attributed to waterside corrosion. 70 However, take the case of a similar failure in the same Boiler. Tube shows bulging (OD= 83.5 mm) and burst opened with thin lips. No significant amount of deposits is observed on ID Get Price
How to Alleviate Waterside Issues in Boilers and HRSGsGet Price
Sep 01, 2014 · As a general rule, the DWD criteria for HRSG tubes is about 20% higher than for a conventional boiler. Occasionally, a utility will want to take …Get Price
Cycle Chemistry –Why is it important? "It is clear that the major Boiler/HRSG failure mechanisms are driven by thermal and/or cycle chemistry influences" (EPRI, 2003) Effective cycle chemistry monitoring and control is required to: Operate plant safely. Protect plant integrity. Meet legal requirements, e.g. PSSR. Maintain reliability and availability.Get Price
Dec 15, 2020 · Figure 1: Iron oxide deposits in boiler tubes leading to tube bursts with the typical fishmouth openings. Sufficient pretreatment to remove suspended solids ahead of RO membranes and a well-designed chemical treatment program to minimize scale formation are important to successful RO unit operation. Careful RO feedwater analysis is critical for proper …Get Price
internal surfaces of the boiler (which is called phosphate hideout) leaving behind a high pH caustic solution [3, 4]. Hideout can occur with tri-sodium phosphate or when Na/PO4 is more than 2.6 for boilers suffer from scale deposition, it also occurs when more phosphate is dosed to the boiler drum, that exceeds the equilibrium concentration.Get Price
Jun 01, 2017 · This method relies on a family of curves and is aimed at protecting the boiler heating surface tubes from either caustic gouging which can occur above the 2.6 control range or acid phosphate tube Get Price
Examples of this type of failure include cracks in boiler components at support brackets or rolled in tubes when a boiler undergoes thermal fatigue due to repeated start-ups and shutdowns. Thermal fatigue occurs in horizontal tube runs as a result of steam blanketing and in water wall tubes due to frequent, prolonged lower header blowdown.Get Price
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