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classification of steam generator

27.2.2. No. GENERATORS FOR ZONE 2, CLASS 1 DIVISION 2, IECEx, NEC, ATEX. (i) Path of Flue gas: The flue gases complete their path in three passes in boiler before they finally are discharged to the atmosphere. Steam turbine generator also improves the turbine efficiency. Gas turbines are widely used in chemical plants, refineries and industrial plants as a … The fired steam generator always includes a superheater, and usually a desuper-heater to supply cooled steam for auxiliary purposes. Classification of Steam turbines The steam turbines are classified based on many factors like exhaust condition, stage design, steam flow, shaft design, types of drive etc. Thus a steam turbine could be viewed as a complex series of windmill-like arrangements, all assembled on the same shaft. The name “steam generator” is also still called “boiler,” but modern steam generators in the supercritical class do not involve the “boiling” phenomenon. Fired boiler: The water receives heat for steam generation by burning of fuel. Nature of heat Source: Depending on the nature of heat source, boilers can be classified as: Fuel fired boiler – These derive their heat energy by combustion of fuel which may be solid, liquid, or gaseous. First pass: The hot flue gases from the fuel burnt in the furnace first travel up to back of the boiler through flue tubes and then at the end of first path they are deflected by dampener in the downward direction towards the bottom flue to start second pass. Hazardous area classification is a method used to identify where an explosive environment may exist. They rarely exceed about 1,500 Megawatts (2 million horsepower) on the top end and are used on a small scale as well, down to about 500 kW (670 horsepower) on the low end. Classification Steam Generator Boiler Fuel Fossil, Waste, Nuclear Tube Contain Fire Tube, Water Tube Furnace Natural, Pressurized, Induced, Balance Pressure Method Water of Firing Circulation of Steam Externally, Internally, HRSG Natural, Forced Low, Medium, High Prepared by: Mohammad Shoeb Siddiqui Sr. Steam systems can be classified by pressure, method for returning condensate and/or pipe lay out. 27.2).The furnace of this boiler is simple and easy to construct and can be easily enlarged. A turbine may be used as stand by drive system. Sudgen’s hair pin type Superheater of Lancashire Boilers. This website uses cookies to improve your experience. More than 120,000 steam turbines delivered worldwide prove that we are a reliable and experienced partner. Babcock and Wilcox, Lamont, Velox, Benson, power etc. The probable load factor. This is a turbine of my own design the generator portion or Technically the Alternator to be more precise is as mentioned above 45 kw 3 phase AC power output. High pressure boiler: the steam pressure in the boiler is higher than 80 bar. This is not the only type of steam generator used (some horizontal in Russian plants and some once-through steam generators in US PWRs), but still the dominant type used. The steam turbines are classified based on many factors like exhaust condition, stage design, steam flow, shaft design, types of drive etc. Alongside we help you get detailed information on the vital import fields that encompass HS codes, product description, duty, quantity, price etc. Turbine Classification. The submerged tube type fresh water generator uses heat from the main engine jacket cooling water to produce water drinkable,by evaporating seawater due to high vacuum, which allows the feed water to evaporate at a comparatively low temperature.Steam can also be used as a source of heat instead of the main engine jacket cooling water. Picture taken from http://universalerectors.com/steam_turbine_generator.html A Steam Generator generate steam at desired rate at the desired pressure and temperature. Zone2 SD (Standard) Zone 2 PT (Project) Zone2 SD (Standard) Zone 2 SD ( Standard ) The Gen Ex Zone 2 SD Diesel Generators are designed to include components which are all certified as suitable for Zone II (G) Group II Cat 3. Classification of Boilers: The steam boilers are classified according to the following basic: 1. Content of tubes: The boiler is either Fire-tube boiler or Water-tube boiler, depending upon the content flowing inside its tubes. Save my name, email, and website in this browser for the next time I comment. 01 Steam generators Art. are examples for high pressure boilers. Recirculation boiler: In this boiler, only a part of water is evaporated and the remaining water is circulated. The steam coming from the steam generator is passed to the first ring of fixed nozzles, where it gets partially expanded. 27.2.4. Side flue The side flue on both sides of the shell directs the flue gases from front to back along the side of the boiler shell. We'll assume you're ok with this, but you can opt-out if you wish. •  The temperatures of the hotter, lighter gases in the chimney increases the draft. Yet another classification is on the operation pressure. Most of the industrial boilers used for processing work and power plant boilers used for power generation are of stationary boilers. Classification … Main flue The main flue directs the flue gases from side flues to chimney. Because of differences in features and characteristics of different boilers, the boilers can be classified on the basis of the following: Mode of circulation of working fluid (water), Shape of tubes and their spatial position. Steam generator — This method also involves heating a container with coils, but the water is contained in a sealed, pressurized tank rather than being open to the air. Its common to classify steam systems as. Shape of tubes and their spatial position. Steam Turbine Driven Generators can range widely in size. Advantages. Using Whyte notation for steam locomotives, each frame is a 4-6-0 locomotive, which in the Pennsylvania Railroad classification system is a "G". The steam produced does not come into contact with heating elements. Third  pass: After completing second pass, the flue gases are then bifurcated into separate paths in the side flues and complete their third pass by travelling from front to back of the boiler in the side flues as shown by the arrows in the sectional top and side view of Fig. Water level gauge indicates the level of water in the boiler and enables the attendant to regulate the supply of feed water. This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Steam Generators – Classification of Boilers”. Steam and feedwater together is called working fluid. A steam boiler in which steam is generated at pressure exceeding 15 psi or a boiler in which hot water is generated at pressure exceeding 160 psi and/or temperature exceeding 250 o F 2. Heating surface: It is the part of the boiler which is exposed to hot gases on one side and water or steam on the other side. Considerations with culinary steam Not as hygienic — While culinary steam is food safe, it’s simply not going to be as hygienic as pure steam that doesn’t contain any chemicals or additives. If the superheated steam is not required, the damper to the superheater U-tubes is closed as shown in Fig 27.4 and the other damper to the bottom flue is opened thus the hot gasses by passing superheater U-tubes and flows directly into the bottom flue and also valve V3 is opened  and valve V1 and V2 are closed and passing boiler steam directly out to main steam outlet through valve V3. There are several classifications for modern steam turbines. They can be classified by cycle and steam conditions, such as Rankine cycle, Rankine regenerative cycle, reheat cycle, condensing or noncondensing, and by the number and arrangement of turbine shaft shafts and casings. (iv) Draft system: The supply of air to the grate is usually done naturally with the help of a chimney. When superheated steam is desired to be produced, damper to superheater U-tubes is opened and the other damper to bottom flue is closed as shown in Fig. Class B and Class S steam sterilization in compliance with international standards A safe and efficient reprocessing workflow provides protection for patients and clinic personnel alike. One type is called an impulse turbine. Based on the inclination of tubes the boilers may be classified as a) Horizontal boiler,  b) Vertical boiler  and c) Inclined boiler. By adjusting the gas damper, the temperature of the steam coming out of the superheater is always maintained constant irrespective of the amount of steam through the superheater. Steam is also used for heating buildings. Working principle of a Steam-Driven Generator. This is similar to conventional combustion boilers. The water to steam conversion takes place in one single pressure circuit. In this post we will discuss each type of tripping classes and their significance. 27.2.13. Illustration Designation and short description 01.10 Article description: Jumag steam generator DG120 Jumag steam generator DG120, with maintenance -free centrifugal pump and water space evaporation system (no coiled pipe) Technical data: - Steam … Flue gas: Heat which is transferred to water in boiler is usually produced by combustion of fuel in the furnace. Introduction to Steam Turbines: A steam turbine is a form of prime mover in which the energy available with high-pressure steam is converted into mechanical power directly in the form of rotary motion. 27.4. 27.5. The high velocity steam strikes moving blades, converting the velocity energy into work. Division of steam flow indicates whether the steam flows in just one direction or if it flows in … The GG1 has two such frames back to back, 4-6-0+0-6-4. Generally, a steam boiler is a type of closed container, designed with steel for heating the water to generate steam by some energy source like burning of fuel with eventually. 2.9 Conclusions. The cast iron boilers are suitable for low pressure; steel boilers are suitable for high pressure and copper and stainless steel boilers are suitable for miniature type of boilers. No. Mobile boilers: The boilers which are fitted on vehicles and continuously move from place to place are called mobile boilers. The parts are as follows: Boiler shell: The cylindrical shaped boiler shell is made by steel plates which are either riveted or welded. In this case, valve V1 and V2 are opened and valve V3 is closed so that steam from shell passes to the superheater U-tubes and after getting superheated passes to the main steam pipe outlet. Classification of the steam turbine:-According to the different principles of doing work, the steam turbine can be divided into impulse type and reaction type.The steam turbine can be classified into the following types according to its thermal power process: Each HRSG solution is custom-engineered to meet your desired operating flexibility and … Heat Recovery Steam Generators Gas Turbine Heat Recovery Steam Generators (HRSGs) are widely used in cogeneration or combined-cycle plants to recover energy from turbine exhaust gases. Position of boiler: The boiler may be classified as (a) horizontal, (b) inclined and (c) vertical,according to position of the boiler. The circulation of water in the shell is shown by solid arrows in the sectional side view. 27.2.16. Pressure of Steam: Boilers may be classified according to steam pressure in the boiler. Comparative advantages and disadvantages of fire-tube and water-tube boilers: Not very necessary as minor scaling would not go far enough to cause overheating and tube-bursting, Required as scaling will lead to tube-bursting, Inconvenient due to large size of the shell. The forced circulation helps in to increase the water circulation along with uniform heat distribution throughout the boiler water thus results in rapid steam generation at high pressure. The Benson boiler is an example of once through boiler. The kinetic energy is transferred to the rotating buckets by the expansion of the steam in the passages between the buckets. Bottom flue directs the flue gases from back to front along the bottom of the boiler shell. The hot gas generated in a furnace is called flue gasses. After completing three passes, the two streams of the flue gases from side flue meet again in the main flue where they finally discharged to atmosphere through the chimney.

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