Boilers And Furnaces Considered In Their Relations To Steam Engineering

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 edition. Excerpt: ... in mixing the hot gas at the centre with the cold film next the surface of the tube. Also in every horizontal tube there is a tendency for the gases to be cooler in the upper part of the tube and hotter in the lower, for the upper part of the tube extracts heat far more readily from the gases than the lower half. The twist of the retarder has the effect of repeatedly turning over the gas in the tube as it flows along. In the second place, the retarder acts by direct radiation of heat to the tube surface. While this action may not be apparent at first sight, it is of such importance that it should be clearly understood. To this end the fact should first be realized that the temperature of the tube surface exposed to the fire in any steam boiler is practically the same as that of water in contact with it, no matter what the temperature of the gas on the other side, supposing, of course, the tube surface to be clean. The reason is that water absorbs heat many times as rapidly as gas. Now suppose we place in the tube any solid body, of any shape whatever. Manifestly, as it is surrounded and bathed on all sides by gases at a temperature of say io00 Fahr., it will, if it loses no heat, soon become of the same temperature as the hot gases. Suppose the surface of the tube is of a temperature of 3000 Fahr., the hot body at the centre of the tube will energetically radiate heat to the walls of the tube and will materially increase the amount of heat transmitted to the water. Whitham's Experiments.--A trial of retarders on a 100 horse-power horizontal tubular boiler was conducted by J. M. Whitham, to ascertain under what conditions, if any, they would add to the efficiency of the boiler. The boiler was 60 inches diameter by 20 feet long, fitted...

A joint effort of three continents, this book is about rational utilization of the fossil fuels for generation of heat or power. It provides a synthesis of two scientific traditions: the high-performance, but often proprietary, Western designs, and the elaborate national standards based on less advanced Eastern designs; it presents both in the same Western format. It is intended for engineers and advanced undergraduate and graduate students with an interest in steam power plants, burners, or furnaces. The text uses a format of practice based on theory: each chapter begins with an explanation of a process, with basic theory developed from first principles; then empirical relationships are presented and, finally, design methods are explained by worked out examples. It will thus provide researchers with a resource for applications of theory to practice. Plant operators will find solutions to and explanations of many of their daily operational problems. Designers will find this book ready with required data, design methods and equations. Finally, consultants will find it very useful for design evaluation.