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FEEDWATER, ACCESSORIES, AND PIPING
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64 Feedwater Heaters and Economizers Feedwater heaters are of two gen-
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eral classes: (1) open heaters, in which the water comes into direct contact and mixes with the heating steam; (2) closed heaters, in which the steam and water are separated by metal surfaces through which heat is transferred The deaerating heater is a special form of open heater which is designed to remove dissolved gases from engines or processes or steam extracted from turbines The purpose of feedwater heating is to improve the thermal performance of the plant; a fuel saving of approximately 1 percent will result from each 12 F (67 C) rise in temperature of the feedwater if the steam used in the heater would otherwise be wasted Other heat exchangers may be incorporated in the feedwater system to supplement feedwater heaters Economizers are closed heaters that utilize the heat in the exit gases to heat the feedwater Economizers may be independent and located above or behind the boiler; or integral, ie, located within the boiler setting and connected directly to the boiler circulating system
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CHAPTER THIRTEEN
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65 Boiler-Water Conditioning Untreated water contains solids and dissolved gases that may cause scale formation, corrosion, caustic embrittlement, foaming, or priming Water conditioning may consist of sedimentation or ltration to reduce suspended solids, softening by chemical treatment to reduce formation of hard scale, evaporation of makeup water to reduce the concentration of suspended solids and dissolved gases, blowdown to reduce the concentration of solids, and deaeration to reduce the concentration of dissolved or mechanically entrained gases to minimize corrosion 66 Boiler Accessories Boiler accessories are those devices which are directly
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connected to the boiler for the purpose of giving safe and convenient operation Certain accessories are required by law, and others are used for improving performance Accessories commonly provided are a steam-pressure gage, water column, safety valve, stop-and-check valve, fusible plug, feedwater regulator, blowoffs, soot blowers, and tube cleaners
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67 General Characteristics Steam turbines are built in sizes from less than 1 kW to over 200,000 kW The small requirements of space per unit of capacity, the enormous capacities possible, the high rotative speed, and close regulation make turbines particularly suitable as prime movers for central-station generation of electrical energy The large speci c volume of steam at low pressure may be handled more satisfactorily by a turbine than by a reciprocating engine, and back pressures of under 1 in Hg (25 cm Hg) abs are successfully used Highly superheated steam may be used without lubrication dif culties, and the exhaust steam is free from oil 68 Types Steam turbines are divided into two general classes: (1) impulse tur-
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bines, in which the expansion of the steam occurs only in the stationary blades or nozzles; (2) reaction turbines, in which the steam expands in both the stationary and the moving blades In impulse turbines, the energy made available by the drop in pressure of the steam as it passes through the nozzles or stationary blades imparts velocity to the steam The steam jet strikes the blades on a rotating disk and transfers its velocity energy to them Velocity staging or velocity compounding is the principle illustrated in Fig 1381
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69 Reaction Turbine The reaction turbine, frequently called the Parsons type,
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is a multipressure-stage machine each stage consisting of a set of xed blades or nozzles followed by a set of rotating blades, as indicated in Fig 1382 The pressure drop is continuous and gradual from supply to exhaust; in any one stage it is small, seldom over 3 lb / in2 (21 kPa), and consequently the number of stages is large The stationary blades extend around the entire circumference because partial peripheral admission is impossible The clearances must be small to minimize steam leakage around the blades to a lower pressure region The leakage loss diminishes toward the exhaust end
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