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Figure 108 Boiler feed piping with Hartford loop
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Figure 109 Condensate return and boiler feedwater system
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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There is little that a client or consulting engineer can do to in uence the basic design of a boiler However, clearly established performance criteria can be used to ensure a long-lived, ef cient system Some of these factors include: 1 Heat release per square foot of at projected radiant surface, a measure of the intensity of radiant heat transfer A high value may contribute to a short boiler life 2 Combustion volume the physical volume in the furnace necessary for complete combustion Too large or too small a volume may reduce ef ciency 3 Convection air unit tube spacing critical when solid fuels are used Small spaces can easily be blocked by scale or ash 4 Combustion ef ciency based on accepted test procedures 5 Flue gas temperature critical in the prevention of condensation and corrosion in the nal sections of the boiler 6 Physical size especially important in existing structures where installation access is limited In the design and installation of larger boilers and high-pressure boilers, it is especially important that the design engineer have experience in the eld, in order to properly evaluate the claims of competing suppliers 1010 Acceptance and Operational Testing
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Residential and small commercial boilers are seldom tested individually for combustion ef ciency For larger boilers and high-pressure boilers, thermal testing in the eld is usually required The standard test is the ASME power test code, short form, input/output test method It is expensive and time-consuming but provides accurate measurement of actual performance There are other tests, but any simpler test is of questionable accuracy and will seldom yield consistent results when it is repeated For operational testing, the operator should have, at the least, a simple ef ciency test kit, such as an Orsat, a Baccharach, or Fyrite gas absorption device These devices or one of the newer automatic gas sampling devices can be used on a regular basis to measure ef ciency and to indicate changes in performance The instruments measure ue gas temperature as well as the percentage of oxygen, carbon monoxide, and carbon dioxide By using a nomograph, the com-
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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bustion ef ciency can be calculated from these data Signi cant changes 10 percent must be investigated Newer automatic gas sampling equipment which simultaneously reads ue gas, oxygen, and carbon monoxide is wonderful for regular testing of boiler performance 1011 Direct- and Indirect-Fired Heating Equipment A direct- red heater is one in which the fuel is converted to heat energy at the point of use The usual fuel is either electricity or a fuel gas, either natural gas or lique ed petroleum gas (LP) Fuel oil is seldom used Direct fuel ring in an occupied space requires background ventilation, enough to dilute the products of combustion Indirect- red heaters utilize a heated uid, eg, steam or hot water, which is heated elsewhere and transported through a piping system to the point of use 1012 Heat Exchangers Water Heating
Heat exchangers for steam to water or water to water are commonly of the shell-and-tube type similar to those described in Chap 9 A steam-to-water exchanger (Fig 1010) could also be called a steam condenser, because it is the latent heat of condensation which is being used to heat the water The steam is in the shell, the water in the tubes The system is controlled as shown in Fig 1011 For more accurate control at light loads, it is common practice to use two control valves in parallel, sequenced, with the smaller valve sized to handle one-third of the load It is more dif cult to control with higher steam
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