An internally fired boiler is a type of boiler where the furnace or firebox is located inside the boiler shell or the main body of the boiler. The fuel used for combustion is placed inside the furnace and the hot gases generated by the combustion process pass through the tubes of the boiler and the water surrounding the tubes gets heated, converting it into steam. In this type of boiler, the combustion process is completely enclosed, making it safer and more efficient compared to externally fired boilers where the fire is outside the boiler shell. Internally fired boilers are commonly used in steam locomotives and in industries such as food processing, textile, and chemical where the steam generated by the boiler is used for various industrial processes. They are also used in power generation plants where they are coupled with steam turbines to produce electricity. Internally fired boilers are commonly used in the food industry for various applications such as cooking, sterilizing, and pasteurizing. These boilers are used to generate steam that is then used to heat, cook or sterilize food products. For example, in the dairy industry, internally fired boilers are used to pasteurize milk and other dairy products. The milk is heated to a specific temperature for a certain amount of time to kill any harmful bacteria and ensure the product is safe for consumption. In bakeries, these boilers are used to produce steam for baking bread and other baked goods. Internally fired boilers are also used in the food processing industry for cooking and sterilizing canned foods, meat products, and vegetables. They are an essential part of the food production process, ensuring that the food is cooked or sterilized to the required standards and is safe for consumption. Internally fired boilers are an important and efficient technology for the food industry, helping to ensure the safety and quality of the food products that we consume. The working principle of internally fired boilers is based on the concept of generating steam by heating water using combustion gases that are produced inside the furnace, which is located inside the boiler shell. The fuel used for combustion, such as coal, wood, oil, or gas, is placed inside the furnace, which is surrounded by water-filled tubes. The heat generated by the burning fuel causes the water in the tubes to boil and turn into steam. The steam produced is then collected and used for various industrial applications. As the hot gases produced during combustion pass through the tubes, they transfer their heat energy to the surrounding water. This process is called heat transfer, and it is the fundamental principle that drives the functioning of an internally fired boiler. The hot gases, after heating the water, are discharged into the atmosphere through a chimney or exhaust pipe. Internally fired boilers can be classified into different types based on the arrangement of the tubes inside the boiler. For example, in a fire-tube boiler, the hot gases pass through the tubes, and the water surrounds the tubes. In a water-tube boiler, the water flows through the tubes, and the hot gases surround the tubes. The working principle of internally fired boilers is based on the principle of converting the heat energy produced by combustion into steam, which is then used for various industrial applications. There are several manufacturers of internally fired boilers around the world. Some of the key manufacturers are: a) Babcock & Wilcox - an American company that produces a range of boilers, including internally fired boilers, for various industries. b) Forbes Marshall - an Indian company that specializes in manufacturing steam boilers, including internally fired boilers, for a wide range of industries. c) Cochran - a Scottish company that produces a range of steam boilers, including internally fired boilers, for various industrial applications. d) Clayton Industries - an American company that specializes in manufacturing high-efficiency steam boilers, including internally fired boilers, for a variety of industries. e) Thermax - an Indian company that produces a range of steam boilers, including internally fired boilers, for various industrial applications. f) Cleaver-Brooks - an American company that specializes in producing a range of boilers, including internally fired boilers, for various industries such as food processing, chemical, and pharmaceutical. g) Miura - a Japanese company that produces high-efficiency steam boilers, including internally fired boilers, for various industries such as food processing, healthcare, and hospitality. These are just a few examples of the many manufacturers of internally fired boilers around the world.
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