Hello friends, today I am going to tell you What is a Babcock & Wilcox Boiler, Working of the Babcock and Wilcox boilers: If you also want to know, then keep reading this article completely.
What is a Babcock & Wilcox Boiler
It is a longitudinal, water tube, externally ignited, fixed boiler. Mostly use it for pressure of 25 bar. Steam can be obtained up to 450°C temperature on the vent valve due to the provision of superheating of steam. The maximum evaporation capacity of this boiler is up to 5 x 10 kg/h. Such boilers have also been made for critical pressure.
Working of the Babcock and Wilcox boilers
It consists of a water drum up to 0.5-1.5m in diameter with the front end connected by a shorter bottom to the ascending header and the rear end connected by a longer bottom to the descending header. Many infinite straight tubes of about 100 mm in diameter are connected to these headers. These tubes are placed in such a way that each tube of each row lies between two tubes of the row above or below. The advantage of this stage is that each water pipe comes in more contact with liquefied gases.
Generally dynamic grating is used in this boiler. The coal on the grating is sent in fixed quantity by the hopper at one end. The mesh moves with a speed of about 0.5 m/min. Therefore, when the coal reaches the other end, it burns completely and the ash falls down into the pit.
To control the flow, a vent controller is installed, which can be operated by chain or rope from the front of the boiler. The entire boiler hangs on the iron girders by iron rods. It remains independent from the manufacture of bricks, so that the shrinkage and expansion of the boiler has no effect on the structures of the bricks.
The boiler compartment is about half filled with water and the remaining space is for steam. When the coal is driven from the hopper onto the grating, the hot gases from the furnace rise up and pass three times over the water tubes attached to the barricade plates and also provide heat to the lower end of the drum and the superheater, and finally to the vent. It reaches the chimney by the controller and exits out of the chimney into the atmosphere. When heated by liquefied gases, the water of the tubes comes into the cell through the ejection header.
From the shell itself, cold water comes into the downstream header. From where it again enters several tubes for heating, thus the continuous circulation of water continues. The steam generated from the water keeps on collecting over the water in the shell. From here the steam enters the superheater through the storage tube, absorbing heat and becomes superheated. From here the steam reaches the stop valve through another tap which is coaxial with the steam bringer.
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