These down-comer tube and riser tube are connected to each other by 5o to 15o straight water tubes as shown in the figure. Again if heat supplies through the tube and water supply around the tube ... Loeffler Boiler is a high pressure, forced circulation and water tube boiler with the internal furnace. A hydraulic pressure test on the boiler and pipework may also be called for. An intensive schedule of maintenance is needed to keep a high pressure railway steam boiler in safe condition. The water tube boilers are mainly used for generating steam with high temperature as well as pressure.

Water Tube Boiler. Water-tube boilers can be especially useful because they’re able to produce steam on-demand with little delay between turning the boiler on and producing steam. Forced draught is provided in the locomotive boiler by injecting exhausted steam back into the exhaust via a blast pipe in the smokebox. The steam drums and mud drums are connected through bent tube banks. Thus in the steam drum, the water, as well as steam, gets divided obviously due to variation in concentration.

In a Nuclear Power Plant steam use on a huge scale.

As firebox technology developed, it was found that placing a baffle of firebricks (heat-resistant bricks) inside the firebox to direct the flow of hot flue gasses up into the top of the firebox before it flowed into the fire tubes increased efficiency by equalizing the heat between upper and lower fire tubes. Looking for Spirax Sarco products and services? When Feed Pump started to supply the feed water then, water converted into saturated steam. Many boilers today make use of high temperature synthetics for the gaskets for both working environments and in preservation service as these materials are safer than the historic options. In the drum, the steam bubbles separate from the water and the steam can be taken off. This firebox has an open base to provide a large grate area and often extends beyond the cylindrical barrel to form a rectangular or tapered enclosure. For common usages, we use a very basic type of steam generator or boiler. Larger heating surface can be achieved by using more numbers of water tubes. The dome is the site of the regulator that controls the exit of steam from the boiler. Another technique for increasing the heating surface is to include internal rifling inside the boiler tubes (also known as Serve tubes).

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The inherent strength of the boiler means it is used as the basis for the vehicle: all the other components, including the wheels, are mounted on brackets attached to the boiler. Every boiler system is also backed by our seven-year pressure vessel guarantee. This is an open area accommodating the flame(s) from the burner(s). These high-output boilers feature the water tube design that Miura is known for, and they can produce steam from a cold start in as little as 5 minutes.

But they need cautious concentration. At the bottom of the water boiler, mud collector is located for removing the mud particles using blow down a cock. There are some other components is present with the boiler like Economizer, Air Pre-Heater, Steam Drum, Feed Water Pump, Construction and Working Principle of Lamont Boiler, Advantage and Disadvantage of Water Tube Boiler, Construction and Working Principle of Velox Boiler, Construction and Working Principle of Loeffler Boiler, Construction and Working Principle of Benson Boiler, Construction and Working Principle of Babcock and Wilcox Boiler.

However, the relatively low temperatures may mean that additional burners are required to bring the steam up to the specification required for the steam turbines. Hitting Surface: It has more hitting surface and has many water tubes that heat the feed water. The superheater may be separately fired because of the comparatively low temperature of the gas turbine exhaust. Flue gases were routed through this, outside the iron boiler shell, after passing through the fire-tube and so to a chimney that was now placed at the front face of the boiler. The longitudinal drum boiler was the original type of water-tube boiler that operated on the thermo-siphon principle (see Figure 3.3.5).

[11], The process starts with a “blowdown” while some pressure remains in the boiler, then the draining away of all the boiler water through the “mudholes” at the base of the firebox and the removal of all the “washout plugs”. But who invented it? Water-tube boilers differ from shell type boilers in that the water is circulated inside the tubes, with the heat source surrounding them. A locomotive boiler with a wide firebox may have arch tubes or thermic syphons. Power Transformer Working Principle, Construction and Types. The energy from the heat source may be extracted as either radiant or convection and conduction.
The water-tube boilers described above are usually of a large capacity. The hot gases are directed along a series of fire tubes, or flues, that penetrate the boiler and heat the water thereby generating saturated ("wet") steam.

This is because of condensed tangential pressure on tubes which is known as hoop stress. In this case, however, heavy girder frames make up the load-bearing chassis of the vehicle, and the boiler is attached to this. Here, the water becomes hot and steam is produced in the water which comes into steam chamber. During travelling of water through inclined water tubes, it absorbs heat of the hot gases, surrounds the water tube, consequently steam bubbles are created in these tubes. Generally, heat passes from the boiler Furnace or Combustion Chamber to around the Boiler Tube.

[8], A minimum return water temperature of 130 °F (54 °C) to 150 °F (66 °C) to the boiler, depending on the specific design, is used to avoid condensing water vapor from the flue gas and dissolving CO2 and SO2 from the flue gasses forming carbolic and sulfuric acid, a corrosive fluid that damages the heat exchanger.

The cross drum boiler is a variant of the longitudinal drum boiler in that the drum is placed cross ways to the heat source as shown in Figure 3.3.6. The option of multiple burners may give flexibility, but the 30 or more burners used in power stations means that complex control systems are necessary. Exhaust gases are fed out through a chimney, and may be used to pre-heat the feed water to increase the efficiency of the boiler. What is a water tube boiler?


This is a horizontal straight water tube boiler; it has a steam drum which is made of steel. Water-tube boilers are usually classified according to certain characteristics, see Table 3.3.1. In the UK the specified maximum interval between full overhauls is ten years. Figure 3.3.2 helps to explain this principle: However, when the pressure in the water-tube boiler is increased, the difference between the densities of the water and saturated steam falls, consequently less circulation occurs. This gives a far greater heating surface area for the volume and weight. A water tube boiler can be defined as a Steam boiler in which the flow of water in the tubes, as well as hot gases, enclose the tubes.

When the water heats up and generates vapor as a result of water heating then collects at the boiler’s vapor space. With this type of boiler, the water runs through a series of tubes that connect the lower mud drum at the bottom of the boiler to the steam drum at the top.

A further development of the water-tube boiler is the bent tube or Stirling boiler shown inFigure 3.3.7. Not like fire tube boilers, this boiler attains high-pressures, as well as high-steam capabilities, can be achieved.

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