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A further 740 kJ / kg of heat energy has to be added to the water in the boiler before saturation temperature at 10 bar g is reached. Figure 3.11.5(b) again shows the formation of steam at 10 bar g, but this time the boiler is fed with feedwater heated to 70°C by returning more condensate.
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boiler. 1. Generation of steam is much quicker due to small. ratio of water content to steam content. This also helps. in reaching the steaming temperature in short time. 2. Its evaporative
Get priceFor the same output the outer shell of fire tube boilers is much larger than the shell of water-tube boiler. Water tube boilers require less weight of metal for a given size, are less liable to explosion, produce higher pressure, are accessible and can respond quickly to …
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This ratio depends on two factors: boiler pressure and boiler water pH. The value of the ratio increases almost logarithmically with increasing pressure and decreases with increasing pH. If the silica enters the boiler water, the usual corrective action is to increase boiler blowdown, to decrease it to acceptable levels and then to correct the condition that caused the silica …
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Water-tube boiler plant is much less tolerant of high TDS levels, and even less so as the pressure increases. This is due to a number of reasons, including: Water-tube boilers have a limited water surface area in the steam drum, relative to the evaporation rate.
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c) A fire tube boiler occupies less space than a water tube boiler, for a given power d) All of the mentioned Answer: a Explanation: "A simple vertical boiler has one fire tube" is the wrong statement. 51. When the circulation of water, in a boiler, is by a centrifugal
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Difference Between Fire Tube Boiler and Water Tube Boiler
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Consequently, the condensing vapor must have a temperature of not less than ∼50 °C, and this sets the lower limit of the column operating pressure. The boiling temperature of the bottoms product increases as the column pressure increases. Typically, medium-pressure steam, which has a temperature of ∼200 °C, is used in the reboiler.
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2012/10/26 · The water tube boiler is a quicker steamer than the fire tube because there is no large mass of water in one body to be acted upon by the hot gases, since it is very effectually broken up by the large number of water tubes.
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2021/6/23 · MCQ Objective Questions and Answers for Boiler Operator Jobs. 1. In the fire tube boilers : (A) The hot gases pass through tubes and water surrounds the tubes. (B) The water passes through the tubes and hot gases surround the tubes. (C) Fire surrounds the tubes and water passes in the tubes. (D) All of the above. 2.
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A. A fire tube boiler occupies less space than a water tube boiler, for a given power B. Steam at a high pressure and in large quantities can be produced with a simple vertical boiler C. A simple vertical boiler has one fire tube D. All of the above
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Difference Between Fire Tube Boiler and Water Tube Boiler
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The water tube boiler is capable of raising steam to a much higher pressure than the shell or fire tube boiler. For an example of a Yarrow marine boiler we may take one having a total heating surface of 3,420 sq. ft., of which 870 sq. ft. are provided by the superheater.
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Definition of Boiler: The equipment used for producing steam is called Boiler or Steam Generator. Or it is also defined as " A closed vessel in which steam is produced from water by the combustion of fuel.". The steam generated is used for: Power generation. Heating.
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The demand for large size boiler units and Increased pressure led to the introduction of water tube boilers and one of the best design of a water tube boiler is the Babcock and Wilcox Boiler. In this article, I will explain all the parts of Babcock and Wilcox Boiler along with working, construction, boiler terms, advantages, and disadvantages.
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2. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency. 3. The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C. 4. The factor of evaporation for all boilers is always greater than unity.
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b. Water tube boiler : The arrangement in the water tube boiler water is that the water is contained inside the tubes while the hot combustion gas is flows on other side of tubes. Water tubes boilers produce high pressure steam which is used for power generation
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A further 740 kJ / kg of heat energy has to be added to the water in the boiler before saturation temperature at 10 bar g is reached. Figure 3.11.5(b) again shows the formation of steam at 10 bar g, but this time the boiler is fed with feedwater heated to 70°C by returning more condensate.
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Water-tube boilers are available for all practicable pressures and outputs. The largest are for up to 5000 ton/h, super critical up to about 35 MPa with both superheater, and reheater up to about 600 C. The water-tube boiler consists of one or more steam drums
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Fire-tube boiler – Wikipedia A fire-tube boiler is a type of boiler in which hot gases pass from a fire through one or (many) more tubes running through a sealed container of water. The heat Ask Price View More Fire Tube Steam Boiler – Nationwide Boiler Nationwide
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Both types of boilers had certain advantages The watertube boiler steams more quickly than does the fire-tube boiler due to the fact that there is not a large mass of water to be heated. Moreover, boilers of this type are not subject to dangerous explosions, since, in the event an explosion does occur, only one of the tubes is likely to let go It likely will cause little or no …
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2021/6/23 · MCQ Objective Questions and Answers for Boiler Operator Jobs. 1. In the fire tube boilers : (A) The hot gases pass through tubes and water surrounds the tubes. (B) The water passes through the tubes and hot gases surround the tubes. (C) Fire surrounds the tubes and water passes in the tubes. (D) All of the above. 2.
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boiler, device for generating steam. It consists of two principal parts: the furnace, which provides heat, usually by burning a fuel, and the boiler proper, a device in which the heat changes water into steam. A steam engine is driven by steam generated under pressure
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Improving Boiler Efficiency Your boiler probably accounts for the majority, if not all, of your heating fuel bill. If you tend to budget a fixed dollar amount for this fuel bill, you may be interested in knowing that most boiler systems are, at best, 85% efficient with an
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Boiler retubing & boiler tube replacementIndustrial Boiler & Mechanical provides retubing and tube replacement for firetube boilers, watertube boilers and other industrial pressure vessels. Bo 1-20 ton gas/oil fired boiler Capacity: 1-20 ton/h Pressure: 0.7-2 Mpa Fuel: Nature gas, coke oven gas, biogas, methanol, liquid propane gas, diesel, heavy oil, light oil, crude oil, etc.
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A steam boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure (7–2,000 kPa or 1–290 psi) but, at pressures above this, it is more usual to speak of a steam generator.
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Boiler retubing & boiler tube replacementIndustrial Boiler & Mechanical provides retubing and tube replacement for firetube boilers, watertube boilers and other industrial pressure vessels. Bo 1-20 ton gas/oil fired boiler Capacity: 1-20 ton/h Pressure: 0.7-2 Mpa Fuel: Nature gas, coke oven gas, biogas, methanol, liquid propane gas, diesel, heavy oil, light oil, crude oil, etc.
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Examples of conduction : Heat flow through the brick wall of a furnace, the metal sheet of a boiler and the metal wall of a heat exchanger tube. Convection : It is the transfer of heat from one point to another point within a fluid (gas or liquid) by mixing of hot and cold portions of the fluid.
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Make-up Water Water which is added to compensate for losses of water and steam from the system. Once-through boiler or HRSG Benson Boiler Boiler in which output steam is generated from input water by evaporation to dryness without recirculation.
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A A water tube boiler has a capacity of 1000 kg/hr of steam. The factor of evaporation is 1.3 boiler rating is 200%, boiler efficiency is 65% heating surface area is 0.91 m^3 per bo.Hp, and the heating value of fuel is 18,400 Kcal/kg. the total coal available in the bunker is 50,000 kg. determine the no, of hrs to consume the available fuel.
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