Water tube boilers in Software

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In water tube boilers, the water is inside the boiler tubes and the products of combustion surround the tubes There is a wide variety of con gurations, including slant-tube (Fig 101), bent-tube (D-type),
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Equipment: Part 2 324 Ten
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Figure 101 Slant-tube water tube boiler
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O-type, C-type, and express type They range in size from small residential units to large utility boilers They have an extended service life if proper water treatment and maintenance are provided Water tube boilers may be factory-assembled and tested, package type, or eld-assembled; the eld-assembled boiler is more common in sizes above 200,000 lb/h capacity Operating pressures of 150 to 900 lb/in2 gauge or greater are used where process requirements are severe or where power generation is a consideration
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Thermal liquid boilers
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Thermal liquid boilers are of the water tube type, but instead of water, a special thermal liquid is used This liquid permits the generation of high temperatures 600 to 800 F at low pressures These units are often found in manufacturing facilities, with the thermal liquid used in processes Steam is generated through a heat exchanger for use in space heating and other purposes These boilers are prevalent in Europe but have seen limited application in the United States Thermal liquids are often elusive in containment Special consideration must be given to joint systems and device seals
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Equipment: Part 2 Equipment: Part 2 325
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Steam quality
Heating and domestic hot water applications utilize saturated steam Saturated steam is at a temperature and pressure that correspond to the saturation conditions discussed in Sec 62 and is said to have 100 percent quality Steam with some free moisture present has less than 100 percent quality (down to zero quality for condensed water) Superheated means that additional heat is applied to the steam to drive its temperature above the saturation temperature at the existing pressure In the boiler, this is accomplished in a special tube bank called a superheater Superheat is required for many turbine and process applications, including cogeneration, but this steam must be desuperheated for use in normal heating and domestic water applications
Combustion Processes and Fuels
The primary source of energy in a heating boiler is the combustion of a fossil fuel coal, oil, or gas or waste materials The use of peat, garbage, sawdust, petroleum coke, and other waste products is increasing, but it is still a small fraction of the total fuel burned in this country Combustion is a process of burning combining the fuel with oxygen and igniting the mixture The result is heat release, absorbed through radiation, convection, and, to some degree, conduction
The combustion process
The combustion process follows basic principles called the three T s of combustion The rst one is time the time required for the air to properly mix with the fuel and for the combustion process to be completed It is critical when waste materials are being combusted in conjunction with standard fuels The second is temperature the temperature at which the fuel will ignite, oxidation is accelerated, and the process of combustion begins Ignition temperatures are well established for standard fossil fuels but must be carefully considered when waste or other organic-type materials are being burned The third is turbulence the process of thoroughly mixing the air and fuel so that each particle of fuel is in contact with the right amount of oxygen and combustion can continue to completion The turbulence must be violent enough to ensure good contact between the fuel and the oxygen Assuming there is enough combustion air to work with, inadequate turbulence is the most common cause of incomplete combustion Inadequate turbulence can result in the generation of excessive amounts
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