Feb 25, 2014· combustion in boilers 1. Combustion Theory Lecture 12 Combustion in Boilers 2. Learning Outcomes 1. Overview of general boiler designs and applications – Heat balance/heat transfer/ heat availability/excess air/size and shape of the combustor – Boiler configurations: Smoke tube (Fire tube) and water tube/ Water wall designs Natural Circulation and Forced Circulation 2.
Definition of BoilerThe capacity of D type water tube boiler is 6-35 t/h, which can meet almost all need of industries. Circulating fluidized bed type water tube boiler ; Compared with oil gas water tube boiler, fluidized bed type water tube boiler has a large capacity and is used in large industries or power plants. Fluidized bed combustion technology is widely
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Jan 31, 2013· Fire tube & water tube boiler In the fire tube boiler the hot gases are inside the tubes & the water surrounds in the tube. ex. Cochran, locomotive etc. of 80 bar and above are called high pressure boiler. ex. Velox The boiler which produce steam at pressure below 80 bar are called low pressure boiler. ex. cochran Horizontal Straight
Mar 04, 2020· A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. This is the basic definition of water tube boiler. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water.. Advantages of Water Tube Boiler. There are many advantages of water tube boiler due to which
Boiler pressure range between 20-25 bar (Low pressure) and for medium pressure boiler pressure range about 25-80 bar. Boiler pressure is up to 80 bar. 4: Fire tube boiler steam production rate is less than water tube boiler. Water tube boiler generates steam 3000kg/Hr Or more. 5: It says Internally fired boiler. It says Externally fired boiler. 6
Nov 25, 2015· b. It is very compact. c. The pressure of the steam is limited to about 20 bar. 22. WATER TUBE BOILERS ARE CLASSIFIED AS : 1). Horizontal Straight tube boiler There are two types of Horizontal straight tube boiler: a. Longitudinal drum b. Cross drum there are three types of cross drum boiler : 1. two drum 2. four drum 3. three drum 2).
Water tube boilers were developed for a variety of reasons, including the need for higher steam pressures, higher steam generation rate, superheated steam. these types of boilers have quicker response to load changes. We briefly discuss about Water tube boiler parts and functions. In the water tube boiler, the water and steam flow inside the
WNS type boiler can burn oil or gas, which is cleaner than others. This boilers are mainly used in school, hospital, hotel, textile industry, chemical plant, power plant, paper & pulp, pharmaceuticals, refinery, food processing, building materials, etc. It include fire tube boiler, water …
Fire-tube boiler: Fire tube boilers are those boilers in which hot gases produced by the combination …Aug 28, 2019· Water Tube Boiler is a high-pressure boiler that operates at a pressure of about 165 bar. Basically, in this boiler, water will be flown inside the tubes surrounded by flue gases. More steam is generated by using this boiler so, the overall efficiency of the boiler is high.
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Jun 10, 2017· Special features of water tube boiler: Water tube boilers have the high evaporating capacity (20,000 to 40,000 kg/h) compared with other boilers. The operating pressure lies between 11.5 to 17.5 bar. The draft losses are minimum. The defective tubes in water tube boilers can be identified and replaced easily. The entire boiler rests on iron
Boiler Types and Classifications. There are two general types of boilers: ''fire-tube'' and ''water-tube''. Boilers are classified as "high-pressure" or "low-pressure" and "steam boiler" or "hot water boiler." Boilers that operate higher than 15 psig are called "high-pressure" boilers. A …
DISCOVERY® D-type watertube boilers are operating in hundreds of industrial applications in a multitude of industries wordwide. This proven design offers large furnaces and are engineered for long-term reliability. They are especially well-suited for high-pressure, superheated steam …
Boiler feed water quality is limited owing to problems of (1) scaling, (2) corrosion, and (3) foaming. In order to avoid these problems, the quality guidelines shown in Table IV have been adopted. Data in Table IV show a major difference between cooling water and boiler feed water quality constraints, in that boiler feed water has a strong relationship between water quality and the pressure of
Oct 19, 2015· In industrial boilers natural circulation is used in the water walls. For other heat transfer coils it is just forced circulation. this is the case followed in most of the boilers except for supercritical one's where there is no density difference
A high pressure watertube boiler (also spelled water-tube and water tube) is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas which heats water in the steam-generating tubes.In smaller boilers, additional generating tubes are separate in the furnace, while larger utility boilers rely on the water-filled tubes