1-20 of 34 Search Results for

Feedwater

Sort by
Image
Published: 01 January 2000
Fig. 38 A cast steel feedwater-pump impeller severely damaged by cavitation. Note how damage is confined to the outer edges of the impeller where vane speed was maximum. Source: Nalco Chemical Company More
Image
Published: 01 December 2006
Fig. 12 Feedwater economizer, finned tube harp assembly More
Image
Published: 01 March 2001
Fig. 12 A cast steel feedwater-pump impeller severely damaged by cavitation. Note how damage is confined to the outer edges of the impeller where vane speed was maximum. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430343
EISBN: 978-1-62708-253-2
... insist on running the plant at 110% of the MCR or beyond in order to maximize production. This often results in continuous and sometimes severe over-firing of the equipment, leading to tube failure. Failures Due to Poor Water Chemistry Control Boiler feedwater comprises make-up water...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430379
EISBN: 978-1-62708-253-2
... of impurities and feedwater parameters on high-pressure boiler components. It discusses deposition and scaling, types of corrosion, and carryover, a condition that occurs when steam becomes contaminated with droplets of boiler water. The chapter also covers water treatment procedures, including filtration...
Image
Published: 01 July 2000
Fig. 7.32 (a) Pitting corrosion of inner wall of boiler tube due to insufficient deaeration of feedwater. Corrosion products brush removed from right side of section. (b) Cross section of pipe wall showing distribution of pits More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820077
EISBN: 978-1-62708-339-3
... in the HRSG low-pressure feedwater economizer. Heat-Recovery Steam Generator Design An HRSG generates steam from the heat of exhaust gases from a combustion turbine (CT). The steam produced in the HRSG is sent either to a steam turbine (ST) to produce electricity and/or to be used in another process...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310243
EISBN: 978-1-62708-286-0
... viable quantities began with multistage flash technology in the 1950s. The underlying principle of this process is the evaporation of water vapor from salt water with the subsequent condensation of the salt-free water vapor. In the multi-stage flash (MSF) approach feedwater is heated and the pressure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430204
EISBN: 978-1-62708-253-2
... of the magnetite layer is that, once formed, it protects the tube from subsequent corrosion. In other words, it acts as a passive layer and therefore is desired for longer life of the tube. Treatment of boiler feedwater (BFW) with water treatment chemicals such as hydrazine helps to promote the formation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030089
EISBN: 978-1-62708-282-2
... in these systems are now being postweld stress relieved. Corrosion of Welds in Carbon Steel Deaerator Tanks Deaerator tanks, the vessels that control free oxygen and other dissolved gases to acceptable levels in boiler feedwater, are subject to a great deal of corrosion and cracking. Several years ago...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.9781627082532
EISBN: 978-1-62708-253-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430017
EISBN: 978-1-62708-253-2
... gases coming out of the boiler carry a lot of heat. The economizer is a horizontal continuous-type counterflow heat exchanger. The function of the economizer is to recover some of the heat from the heat carried away in the flue gases up the chimney and utilize it for heating the feedwater to the boiler...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430001
EISBN: 978-1-62708-253-2
... to form a fireball in the combustion chamber. The combustion takes place at 1300 to 1700 °C (2370 to 3090 °F) and the heat generated is transferred to the feedwater that flows through the waterwall tubes that form the walls of the furnace. The feedwater consists of condensate or condensed steam returned...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930217
EISBN: 978-1-62708-359-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820013
EISBN: 978-1-62708-339-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490001
EISBN: 978-1-62708-340-9
... to a relatively low temperature in feedwater heaters and pumped into tubes contained in a boiler. The water is heated to steam by the heat of combustion of pulverized coal in the boiler and then superheated. Superheated and pressurized steam is then allowed to expand in a high-pressure (HP) steam turbine...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
...) steam to a paper machine. This line was 30 m (100 ft) downstream from a spray attemperator that cooled higher-temperature steam by spraying boiler feedwater into the line. When cracks were initially discovered, they were ground out and rewelded. The repair welds reportedly cracked after only a few...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090349
EISBN: 978-1-62708-266-2
... the oxygen level in the entire coolant system through additions of hydrogen to the feedwater. Laboratory and in-reactor experiments have revealed that the conductivity of the water (the content of ionic impurities) must be closely controlled to a level of 0.3 μS/cm or less to suppress intergranular SCC...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430107
EISBN: 978-1-62708-253-2
... of scales occurs when elements such as calcium, magnesium, and silica, commonly found in boiler feedwater, react with the tube material to form a continuous layer on the water side of the tube. Scale formation can occur on the OD side of the tube as well, mainly due to flue gases ( Fig. 5.6 ). Because...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430290
EISBN: 978-1-62708-253-2
... steel with dimensions of 38.1 mm (1.5 in.) OD and 3.25 mm (0.13 in.) wall thickness. The boiler had been in operation for 12 years, and external deposits were observed at every outage. The flue gas temperature was reported to be about 220 °C (430 °F). The temperature of the boiler feedwater (BFW...