Document n91ZbrLd7RpN8L6eG3gyqrmYR

More TECHNICAL BRIEFS. **fta o When the ammonia feed woe slopped, which provided much belter control. It the reducing power and iron content of the 16th stogo umple were etill high sad the pH in the range 6 to 7. When the may be of interest to note that only one evaporator has been cleaned me chanically In the five year history of tha parent as the carbon dioxide in the tom was reduced to reasonable rals^ Soon alter this unit was placed in open sulfite treatment wee mopped but with station. Subsequent inspections proves don, conductivity of (he condensate t ammonia treatment in uk, the reducing that cleaning by any means has been the bolweil was reduced to a tve*j, power and the iron pickup both were almost zero. The pH varied from 6.8 (NH, 0.2S) in the steam to 7.6 (Ml* 0.05} la the 18th stage cample. When both sulfite and ammonia treat" found to be unnecessary to date. Jn the past few years we had noticed, in various publications pertaining to steam power plants, a growing interest and awareness of the problem caused 0.6 mlcrombos and ettrboa dioxide ^ the deaerator discharge decreased approximately 3.5 to l ppm. This program, primarily aimed at r* dueiog corro&ion In the system, was menu were stopped, the reduei&g power by iron In high pressure, low make-up riously a great step forward. While as and ammonia were low at ell templing plants. With all of these factors in serious problems had been encounter^, point*. The pH remained In tha range 7.0 to 7.5 but there su some iron pick" up in the 16th stage sample. These results indicated that the best mind, and thinking that we should at tack the problem before trouble oc curred, li was decided to make some eflort to minimize carbon dioxide and (hot could be attributed to corrode* only, we did experience coosidsrtM* difficulty with healer drains. While I*, temol conditions in the major equlpc&em treatment, as far as iron pickup and the maintenance of a higher pH In the consequently, Iron. After gping Into this problem thoroughly with both our showed no unusual amounts of ins oxide deposits, we believed that U u 18th stage, was with the ammonia treat* water consultants and station designers, possible to still further reduce corra. moot and without sulfite treatment In the boiler water- To operate under these conditions meant loss of reducing our belief was that (he evaporator feed water could best be treated for the re move) of excess carbon dioxide with on sive tendencies prevailing In the wi*'cycle and consequently the iron eoattu of (he system. agent protection in the boiler water. The work was then directed toward acid regenerated zeolite, followed fay degassification and neutralization with We had observed, in technical pokfe.' cations of the last few years, a tendency using a reducing agent other than sulfite. Hydrexlne (NjH,) bad been caustic soda. Consequently, In the lat ter port of{1950 such a unit was placed toward the Increasing use of higher cosdentate pH values to further minimize reported successfully used in low pres* on order and put into operation in July corrosive tendencies prevailing in other sure Inatallationa in Europe and labora o< 19$l. Results wete immediately op- plants. At that lime we thought it feas tory tests Indicated that it was fairly ible to conaider (our methods of further stable at high sictra pressure*. Solu reducing the carbon dioxide and increas tions of bydrssine In water are available ing the pH in the cycle. The author In concentrations around 22%. This is a clear water white liquid that is TO OBTAIN COMPLETE TEXT then summarizes the methods considered' and reasons why they were discarded or easily handled. APC Paper, no number. Material for these abstract! accepted. dPC Paper, no number. comet from the following sources Use of Amines In low Mokw-Up Steam Plant. By II / Guillory, Central Louis iana Electric Co. All makeup (approximately 1%) for the author's company's Coughlin sta tion comes from two bent-tube evapora tor! discharging their vapor into deaerating heaters- One of these evap orators discharge Into tha one deaerator serving Units i end Z The other evap orator discharges Into the deaerator for No. 3 or that for No. 4 Unit. An inter- connected ityitem of four 10,000'gaffon condensate storage tonka provide max imum flexibility of make-up control. In addition to the conventional deaeration supplied by the heaters, all condensers are equipped with deaerating hotwolle. Initially, all feeds for these two evap orators were obtained from deep wells, located on the property, with no pro visions made for softening or pretrentmeot of the well water. However, they were treated internally with phosphate, a lignin organic and todfum sulfite. The phosphate was fed at the deep well pump discharges for Iron stabilisation end the orgonio and sulfite "slug*' fed to the evaporator shells. Later, continuous (eed of these chemicals was resorted to unleu otherwise stored. Order complete paper from sources, net Powcn. American Power Conference, annual meeting, Sherman Haiti, Chicago, HU Mar 24-27, 1953. Identified by Initials APC and ob tainable in proceedings printed and distributed by R A Bttdenhotter, chairmen, Illinois Insti tute of Technology. 3300 Federal St, Chicago 16, /U. $6/10. American Institute of Electrical Engineers, winter general meet ing, Statler Hotel, New York. N. K, Jan 19-23, 1953. fdentb fied by initials AIEE and obtain, eblo through AIEE, 33 V 39th St, Hew York 18, N. Y. Manufacturing Chemists' Asso ciation, Inc, Voter and Air Pollution Abatement Conferences, Oct 23-24,1952, NethcrUtnd plaza ffotef, Cincinnati, Ohio and Feb 26-27,1953, Hotel Statler, Detroit, Mich. Identified by buiialf MPC and obtainable from Manufactur ing Chemists' Attn, 246 Wood ward Bldg, Washington 5 D. C. , OoolkoHiollon of Boiler Feedwater In Smell Power Plants. By A E KUtredgt, Cochrane Corp. Awareness of the need of alkalinity reduction gave leadership u> the hoi. process precipitation type softener In preparing feedwater for industries re quiring large volumes of treated water. When the need of alkalinity reductiea was appreciated end demanded, the exchange type zeolite water softener led its advantage of simplicity and economy since the only method of accomplishing alkalinity reduction with that softening process was, until recently, by use ol scfd either directly or through the am of acid regenerated hydrogen zeolites.' Alkalinity reduction by anion. ex change is basically a process where practically all o! tho anions dissolved in a water supply arc exchanged In the same way as in on ordinary eeoflte water softener for the chloride too el ordinary salt. Sodium softening ex changes all calcium and msgnejiuro cations for sodium. Chloride daalksNsa(too exchanges all bicarbonate and . fetes for chloride. The latter process produces a water supply haring the {Continued on page 214) m. Your "burning 'is quickly answere \Bt,0 Bituminous Whether your xpedfle question concerns power, coking, qfcttcacrt, or spaa heating, you'll find the perfect answer among wide variety of Bituminous coals in Baltimore &. Ohio KWrritory. Hero Ilea on almost inexhaustible source of low-cost fheot end energy. The benefits of BAO Bituminous are many. Highly mechanized mines keep production costa low, size and quality ^ uniform. Closeness to America's industrial heart means eeo^ .noraial transportation. 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