Mindblown: a blog about philosophy.
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REQUIREMENTS OF A GOOD BOILER
A good boiler should possess the following qualities:
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COMPARISON OF FIRE TUBE AND WATER TUBE BOILERS
Table 3.1 shows the comparison of fire tube and water tube boilers. Table 3.1 Comparison of fire tube and water tube boilers
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CLASSIFICATION OF STEAM GENERATORS
Steam generators are classified based on the following:
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INTRODUCTION
A steam generator, popularly known as a boiler, is a closed vessel made of high-quality steel in which steam is generated from water by the application of heat. The water receives heat from the hot gases formed by burning fuel through the heating surface of the boiler. Steam is mainly required for power generation, process…
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Example 2.1
Determine the condition of steam in the following cases: Solution Given p = 10 bar; t = 200°C; v = 0.175 m3/kg Example 2.2 Calculate the quantity of heat required to generate 1 kg of steam at a pressure of 8 bar from water at 30°C (a) when dryness fraction is 0.9, (b) when steam is just dry, and (c) when…
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DETERMINATION OF DRYNESS FRACTION OF STEAM
The different methods commonly used for the measurement of dryness fraction of steam are as follows: The working principle of all the calorimeters is to bring the state of the substance from the two-phase region to the single phase region (either compressed liquid or superheated vapour region). This is because in the two-phase region, pressure…
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ENTHALPY−ENTROPY OR MOLLIER DIAGRAM OF STEAM
In Mollier diagram (Fig. 2.3), the vertical ordinate represents the enthalpy and the horizontal ordinate represents the entropy. The regions above and below the saturation line represent the superheated and wet conditions of steam, respectively. The lines of constant dryness fraction are shown in the wet steam region, whereas the lines of constant temperature and…
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TEMPERATURE−ENTROPY DIAGRAM FOR WATER AND STEAM
It is the plot of the saturation temperature of water and steam corresponding to various absolute pressure vs entropies at those saturation temperatures, as shown in Fig. 2.2. The curve on the left marked water line (saturated liquid line) shows the relationship between entropy and temperature before steam is formed. The dry steam line (saturated vapour…
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STEAM TABLES
In actual practice, it is quite cumbersome to calculate the relation between various quantities such as pressure, temperature, volume, enthalpy, latent heat and entropy, etc., of steam. Such quantities have been determined experimentally and recorded in the form of tables known as steam tables. Steam table is a complete data book that contains various properties, like…
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PROPERTIES OF STEAM
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