...Abstract This work presents the results of a field-based study designed to evaluate the corrosion performance of five alloys exposed in a Canadian biomass-fired boiler attached to a gasifier for 3,552 h. The corrosion performance of the candidate alloys can be ranked as follows: N08028 > S34709...

...Abstract Boiler treatment chemistry has been shown to be critical in maintaining clean heat transfer surfaces and minimizing corrosion in higher pressure industrial boilers. Monitoring boiler feedwater contamination, especially iron and copper, from condensate leakage and upsets is a critical...

...Abstract Weld overlay of the UNS K1157 (ASME SA213-T11) boiler tubes is required in coal fired boilers operating in a low-NO_x combustion mode to prevent excessive corrosion of the pressure tubes. When retrofitting boilers to a low-NO_x combustion mode (to reduce emissions...

...The purpose of this study is the acquisition of fundamental data required for optimum material selection. The heavy liquid fuel oil properties considered in this study are shown in Table 1 . The boiler layout is given in Figure 1 . The main concerns affecting a heavy liquid fuel fired boiler...

...Abstract Tube damage due to stress-assisted corrosion (SAC, or Corrosion Fatigue) is relatively common in recovery boilers. Another damage mechanism, known as “phosphate hideout,” has been attributed to under-deposit corrosion in high-pressure boilers. Phosphate hideout is characterized...

...There are extensive publications related to SCC resistance of nickel base alloys and stainless steels in nuclear and conventional fossil fuel power generation: Abstract Several nickel base alloys are currently being considered for use in advanced ultra-supercritical (A-USC) boiler applications...

...Water quality of feedwater has been going worse because steam condensate is aggressively recovered to save energy and various water sources are used for make-up due to a water shortage. Additionally, the heat load of boiler heating surface has been increased to achieve high boiler efficiency...

...) analyzer. The sample chemical composition matches the composition of ASTM A 179 ( Table 1 ). Abstract This paper presents failure analysis performed to investigate thinning observed in bank tubes of a package boiler. Thorough investigation using visual inspection, chemical analyses, metallographic...

...In the tubes after the de-aerator, FAC occurs, where the iron ion solubility in water becomes high at a lower pH than 10, so that the generated iron ions by FAC begin to become iron oxide suspended solids (SS) in water after the high pressure heater (HPH); the iron oxide enters the boiler...

...Abstract Using oxygen, rather than air, in coal-fired boilers is a leading strategy to reduce NO_x emissions and concentrate CO₂ for capture. However, with flue gas recirculation, higher levels of CO₂ and possibly H₂O and SO₂ are expected...

... AND DISCUSSION Gas-Only Oxidation Experiments Abstract Replacing air with oxygen in coal-fired boilers (i.e. oxy-firing) combined with flue gas recirculation is a leading strategy to concentrate CO₂ in the flue gas and assist in carbon capture for subsequent sequestration. A significant area...

...Abstract UNS R20033 is produced as a welding consumable and is covered under AWS A.9 under the designation of ER33-31. This material is now being widely used as weld overlay material in the fossil boiler industry. The high chromium content of ER33-31 has been shown to provide excellent corrosion...

... CO₂ and passing through a cation exchange resin column. DCC depends on the amount of produced organic acid by thermal decomposition of amine. Table 1 Conditions of Thermal Behavior Test Pressure of boiler 10 MPa 310 °C Temperature at the exit of superheater 310 - 600 °C Feedwater...

... the efficiency of a boiler’s steam cycle can be increased by raising its maximum steam temperature, alkali metals and chlorine released in biofuel boilers cause accelerated corrosion and fouling at high superheater steam temperatures. Most alloys that resist high temperature corrosion protect themselves...

... (1) Retired from NIMS(National Institute of Material Science) Abstract 9Cr steel has been widely used for boiler tube, header and pipe because of the excellent high temperature strength. It is well known that the creep failure is anticipated in weld joint, like Type four cracking due to the low...

... (OTSG) or drum boilers, both of which are typically observed at oil sands in-situ facilities. Table 2 summarizes typical drum boiler and OTSG specifications. TABLE 1 CHANGES IN OSPW WATER 1997 1998 1999 2000 2001 PH 7.9 8.1 8.2 8.4 8.5 Conductivity, uS/cm 1703 2178 2237...

... been developed for use in advanced coal fired power boilers. The grade is designed for high creep- and oxidation resistance, high structural stability and good fabricability. It can be utilized at temperatures up to around 700°C. The temperature strength is reached by precipitate strengthening through...

... costly than those with welded coatings, while the induction heating process reduces distortion in the products, facilitating easier final assembly. After a successful first experimental application of tubes in a boiler wall, 11 units (five six-meter tubes per unit) were put to the test in a Waste...

... to the temperature of the saturated steam entering the de-aerator, demonstrating that efficient heating occurred during off-loading and non offloading periods, i.e., at higher and lower boiler loads. Removal of the pre-heater was evaluated not to be a root cause. However it was recommended to continue to monitor...

...Abstract Generally, it is well know that the bank tubes are one of the components of package boilers that fail frequently. In the investigated case the bank tube experienced a leak due to a circumferential through wall crack developed on the top half. This portion of the tube is swaged...