Boiler burner types pdf

ZOZEN, who is one of the most influential industrial manufactures in Asia, is sparing no effort to innovate the power economized boilers. During the processing of broilers, whether it is retort sterilization, baking and cooking, or heating and drying, the heat source provided by the steam boiler is required. Furnace is on the right side and convection tube bundle is on the left.

The boiler body is fixed on the basement by middle and both end flexible supports and make the boiler to expand horizontally to sideways.

The water-cooled membrane wall on the left side of the furnace completely seals the furnace from the convection tube bundle. Generally, the consumption of the steam boiler fuel in the textile industry is relatively large. Therefore, the steam boiler that provides thermal source is very important.

This series of boiler has the advantages of high efficiency, strong overload capacity and wide adaptability of fuel types. Advantages: save energy, reduce consumption and help customers reduce the costs. The key processing technologies of the steel plate of ZOZEN gas fired boiler, such as the slanting of the steel plate, the circle, and the drilling of the drum, all adopt advanced CNC processing technology to reduce assembly stress and extend the service life of the boiler.

Email Address. Saif M. He completed his engineering studies in and is currently working in a large firm as Mechanical Engineer. He is also an author and editor at www. Notify me of follow-up comments by email. Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed. Earlier generation boilers used to be dry back. The layout of the tubes involves the number of passes the tube will make to pass the heat from the boiler furnace before being discharged.

These can be two- pass and three pass boiler. Combustion gases should be cooled before entering the reversal chamber. Excess temperature causes overheating and cracking of the tube. The heat transfer rate is maximum at the first pass, this rate decreases with the increasing passes.

A three pass design provides three opportunities for heat transfer. The stack temperature of 3 pass will be lower than that of 2 pass boiler, of the same design and operating pressure. Efficiency is more than two pass boiler. Each pass in boiler should be designed with cross sectional area to achieve optimal flue gas velocity, which in turn maximizes heat transfer while also minimizing performance robbing sooth build up within the tubes.

Of pass Area of tube m2 Temperature 0C Heat transfer. In water tube boilers, water and steam flow inside the tubes and the hot gases flow over the outside surface. Modern high capacity boilers are of water tube type. The boiler circulation system is constructed of tubes, headers, and drums joined in arrangement that provide water flow to generate steam.

Water tubes have high pressures and capacity than shell tube boilers. These boilers can be of single- or multiple-drum type.

These have higher efficiencies than fire tube boilers. The feedwater is feed in drum. The drum is placed above the heat source. The cooler water goes to the inclined tubes and the water is heating eventually in the hot tubes. As the water boils its density decreases and there is circulation of hot water and steam. Steam is separated from water in steam drum and taken out. The drum in this type is placed in cross to the heat source.

The temperature obtained in this type of arrangement is more uniform. When the steam loads are high the upper tubes can become dry which cause them to fail.

The layout of tubes is made in such a way that large numbers of tubes are made available. A Stirling boiler has near vertical, almost straight water tubes that zig-zag between a number of steam and water drum. Usually there are three banks of tubes in a four drum layout. The feedwater enters the left upper drum, from where it falls to lower water drum.

Water in pipes and two drums is heated, the steam produced rise in upper drum from where steam is separated and taken off. These boilers come as complete package. It requires only the steam, water pipe work, fuel supply and electrical connections to be made for it to become operational.

Package boilers are generally shell type with fire tube design so as to achieve high heat transfer rates. The packaged boiler is so called because it comes as a complete package.