Saturday 16 July 2011

Power generation at Thermal (coal) power plant

Practical:-






Theory:-






1.Cooling tower:
                  Cooling towers are heat removal devices used to transfer process waste heat to the atmosphere. Cooling towers may either use the evaporation of water to remove process heat and cool the working fluid to near the wet-bulb air temperature or in the case of closed circuit dry cooling tower rely solely on air to cool the working fluid to near the dry-bulb air temperature.

 2.Cooling tower Pump:
 
3.Transmission:
                   Electric power transmission or "high voltage electric transmission" is the bulk transfer of electrical energy, from generating power plants to substations located near population centers.



4.Transformer:
                           A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core and thus a varying magnetic field through the secondary winding. This varying magnetic field induces a varying electromotive force (EMF), or "voltage", in the secondary winding. This effect is called mutual induction.
                                                                  \frac{V_\text{s}}{V_{\text{p}}} = \frac{N_\text{s}}{N_\text{p}}

5.Generator:
                    In electricity generation, an electric generator is a device that converts mechanical energy to electrical energy. A generator forces electrons in the windings to flow through the external electrical circuit.

6.Steam turbine:
                     A steam turbine is a mechanical device that extracts thermal energy from pressurized steam, and converts it into rotary motion.

7.condensate pump:
              A condensate pump is a specific type of pump used to pump the condensate (water) produced in an HVAC (heating or cooling), refrigeration, condensing boiler furnace or steam system. They may be used to pump the condensate produced from latent water vapor in any of the following gas mixtures:
  • Conditioned (cooled or heated) building air
  • Refrigerated air in cooling and freezing systems
  • Steam in heat exchangers and radiators
  • The exhaust stream of very-high-efficiency furnaces
8.Surface condenser:
      Surface condenser is the commonly used term for a water-cooled shell and tube heat ex changer installed on the exhaust steam from a steam turbine in thermal power stations.These condensers are heat ex changers which convert steam from its gaseous to its liquid state at a pressure below atmospheric pressure. Where cooling water is in short supply, an air-cooled condenser is often used.

10.Control valves:
          Control valves are valves used to control conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to signals received from controllers that compare a "setpoint" to a "process variable" whose value is provided by sensors that monitor changes in such conditions.

12.Deaerator:
              A deaerator is a device that is widely used for the removal of air and other dissolved gases from the feedwater to steam-generating boilers. In particular, dissolved oxygen in boiler feedwaters will cause serious corrosion damage in steam systems by attaching to the walls of metal piping and other metallic equipment and forming oxides (rust).

13.Feedwater heater:
             A feedwater heater is a power plant component used to pre-heat water delivered to a steam generating boiler.
for more details in feedwater heater click here Feedwater.pdf

14.Coal Conveyor:
          A conveyor system is a common piece of mechanical handling equipment that moves materials from one location to another. Conveyors are especially useful in applications involving the transportation of heavy or bulky materials.
 

16.Coal Pulverizer:
 A pulverizer or grinder is a mechanical device for the grinding of many different types of materials. For example, they are used to pulverize coal for combustion in the steam-generating furnaces of fossil fuel power plants.

17.Steam Drum:
                     A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture.

  
18.Bottom ash hopper:
                 Bottom ash refers to part of the non-combustible residues of combustion. In an industrial context, it usually refers to coal combustion and comprises traces of combustibles embedded in forming clinkers and sticking to hot side walls of a coal-burning furnace during its operation. The portion of the ash that escapes up the chimney or stack is, however, referred to as fly ash. The clinkers fall by themselves into the water or sometimes by poking manually, and get cooled. 

19.Superheater:
               A superheater is a device used to convert saturated steam or wet steam into dry steam used for power generation or processes. There are three types of superheaters namely: radiant, convection, and separately fired.

A radiant superheater is placed directly in the combustion chamber.
A convection superheater is located in the path of the hot gases.
A separately fired superheater, as its name implies, is totally separated from the boiler.


 21.Reheater:
               A steam boiler component in which heat is added to intermediate-pressure steam, which has given up some of its energy in expansion through the high-pressure turbine. 

 22.Combustion air intake:
             Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species. The release of heat can result in the production of light in the form of either glowing or a flame.

23.Economizer:
                Economizers are mechanical devices intended to reduce energy consumption, or to perform another useful function such as preheating a fluid. The term economizer is used for other purposes as well. Boiler, powerplant, and heating, ventilating, and air-conditioning.

24.Air preheater:
               An air preheater (APH) is a general term to describe any device designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the process. They may be used alone or to replace a recuperative heat system or to replace a steam coil. 


25.Electostatic precipitator:
                    An electrostatic precipitator is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. Electrostatic precipitators are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.

27.Flue-gas stack:
             A flue-gas stack is a type of chimney, a vertical pipe, channel or similar structure through which combustion product gases called flue gases are exhausted to the outside air. Flue gases are produced when coal, oil, natural gas, wood or any other fuel is combusted in an industrial furnace, a power plant's steam-generating boiler, or other large combustion device. 

9.Intermediate pressure steam turbine
10.High pressure steam turbine
20.Forced draught (draft) fan
26. Induced draught (draft) fan

Friday 8 July 2011

How the motors works


Electrical Engineer jobs in UK

Top 10 sites to search jobs in UK






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Friday 27 May 2011

Important for your Mobile Phone

1.Emergency

                          The Emergency Number worldwide for Mobile is 112. If you find yourself out of the coverage area of your mobile network and there is an Emergency, dial 112 and the mobile will search any existing network to establish the emergency number for you, and interestingly, this number 112can be dialed even if the keypad is locked. Try it out.
2.Locked your keys in the car?

                           
                                 If you lock your keys in the car, call someone at home on their cell phone from your cell phone. Hold your cell phone about a foot from your car door and have the person at your home press the unlock button, holding it near the mobile phone on their end. Your car will unlock. 
3.Hidden Battery Power 

                    Imagine your cell battery is very low. To activate, press the keys *3370#. Your cell phone will restart with its reserve power and the instrument will show a 50% increase in battery. This reserve will get charged when you charge your cell phone next time.

  4.Disable a stolen mobile




    To check your Mobile phone's serial number, press *#06#. A 15-digit code will appear on the
screen. This number is unique to your handset. Write it down and keep it somewhere safe. 
                  When your phone get stolen, you can phone your service provider and give them this code. They will then be able to block your handset so even if the thief changes the SIM card, your phone will be totally useless. You probably won't get your phone back, but at least you know that whoever stole it can't use/sell it either. If everybody does this, there
would be no point in people stealing mobile phones.

Thursday 26 May 2011

Ten places you can’t enter


Ten places you can’t enter

The world is full of secret and exclusive places that we either don’t know about, or simply couldn’t visit if we wanted to. This list takes a look at ten of the most significant places around the world that are closed to the general public or are virtually impossible for the general public to visit.
10. Mezhgorye
Underground16 01
Mezhgorye is a closed town in Russia which is believed to house people working on the highly secret Mount Yamantaw. The town was founded in 1979. Mount Yamantaw stands at 1,640 metres (5,381 ft) and is the highest mountain in the southern Urals. Along with Kosvinsky Mountain (600 km to the north), it is suspected by the United States of being a large secret nuclear facility and/or bunker. Large excavation projects have been observed by U.S. satellite imagery as recently as the late 1990s, during the time of Boris Yeltsin’s pro-Western government after the fall of the Soviet Union. Two garrisons, Beloretsk-15 and Beloretsk-16, were built on top of the facility. Repeated U.S. questions have yielded several different responses from the Russian government regarding Mount Yamantaw. They have said it is a mining site, a repository for Russian treasures, a food storage area, and a bunker for leaders in case of nuclear war.
Vatican-Archives2
This has been mentioned on a previous list – the archives are not secret despite their names. You can view any document you wish. But you cannot enter the archive. You must submit your request for a document and it will be supplied to you. Despite the foolishness of the recent junk from Ron Howard and Dan Brown (Angels and Demons) the documents are all available and there are no copies of suppressed scientific theories or great works that were banned. The only documents you can’t access are those which are not yet 75 years old (in order to protect diplomatic and governmental information). Indexes are available for people who want to see if a document exists in the archives. The Vatican Secret Archives have been estimated to contain 52 miles (84 km) of shelving, and there are 35,000 volumes in the selective catalog alone.
8. Club 33
800Px-Dscn1166
Contrary to popular belief, Disneyland has a full liquor license which is used when the place closes down to the general public to accommodate private parties. But there is one place in Disneyland that is always open to sell booze: Club 33. Club 33 is a private club located in the heart of the New Orleans Square section of Disneyland. Officially maintained as a secret feature of the theme park, the entrance of the club is located next to the Blue Bayou Restaurant at “33 Royal Street” with the entrance recognizable by an ornate address plate with the number 33 engraved on it. Fees for joining range from 10 – 30 thousand US dollars and membership comes with a car park. If you want to join the club, you have to go to the end of the fourteen year waiting list.
7. Moscow Metro-2
Mapmetro2
Metro-2 in Moscow, Russia is a purported secret underground metro system which parallels the public Moscow Metro. The system was built supposedly during (or from) the time of Stalin and codenamed D-6 by the KGB. Russian journalists have reported that the existence of Metro-2 is neither confirmed nor denied by the Federal Security Service of the Russian Federation (FSB) or the Moscow Metro administration. The length of Metro-2 is rumored to exceed even that of the “civil” (i.e. public) Metro. (It is said to have 4 lines and lie 50 to 200 m deep. It is said to connect the Kremlin with the FSB headquarters, the government airport at Vnukovo-2, and an underground town at Ramenki, in addition to other locations of national importance. Needless to say, the fact that no one confirms its existence makes it pretty difficult to visit.
6. White’s Gentlemen’s Club
400Px-White's.Jpg
White’s is the most exclusive English gentlemen’s club. It was founded in 1693 by Italian Francesco Bianco (Francis White) to sell the newly discovered hot chocolate but eventually became a typical (but extremely private) gentlemen’s club. The club is famous for its “betting book” in which members make bizarre gambles. The most famous of which is a 3,000 pound bet on which of two raindrops would slide down the window first. So why is this club on the list? Women are excluded completely from membership, so that is half our audience out. Secondly, men who want to join this exclusive club can only do so if invited by a sitting member who has the support of two other members. Unless you are a member of royalty, or are extremely powerful in politics or the arts, you are unlikely to ever see the exclusive White’s invitation.
5. Area 51
800Px-Wfm X51 Area51 Warningsign
I have put this so high on the list because it is the one place most readers are likely to expect to see. Area 51 is a nickname for a military base that is located in the southern portion of Nevada in the western United States, 83 miles (133 km) north-northwest of downtown Las Vegas. Situated at its center, on the southern shore of Groom Lake, is a large secretive military airfield. The base’s primary purpose is to support development and testing of experimental aircraft and weapons systems. The intense secrecy surrounding the base, the very existence of which the U.S. government barely acknowledges, has made it the frequent subject of conspiracy theories and a central component to unidentified flying object (UFO) folklore. The sign above states that deadly force can be used if people enter the Area 51 zone.
4. Room 39
Ob-Ej709 North  G 20090903195628
Room 39 or Bureau 39 is arguably one of the most secretive organizations in North Korea that seeks ways to obtain foreign currency for Kim Jong-il, North Korea’s Chairman of the National Defense Commission. Room 39 was established in the late 1970s. It has been described as the lynchpin of the North’s so-called “court economy” centered on the dynastic Kim family. It is unknown how the name originated. Very little is known about Room 39 due to the secretive nature surrounding the organization, but it is widely speculated that the organization uses 10 to 20 bank accounts in China and Switzerland for the purposes of counterfeiting, money laundering, and other illicit transactions. It is also alleged that Room 39 is involved in drug smuggling and illicit weapon sales. It is known, however, that the organization has 120 foreign trade companies under its jurisdiction and is under the direct control of Kim Jong-il. North Korea has denied taking part in any illegal activities. Room 39 is believed to be located inside a ruling Workers’ Party building in Pyongyang, the capital city of North Korea.
3. Ise Grand Shrine
800Px-Naiku 01.Jpg
The Ise Grand Shrine in Japan (which is actually a series of over 100 shrines) is the most sacred shrine in Japan. It is dedicated to Amaterasu (the Sun goddess) and has been in existence since 4BC. The main shrine is alleged to hold the most important item in Japan’s imperial history: the NaikÅ« (the mirror from Japanese mythology which eventually ended up in the hands of the first emperors). The shrine is demolished and rebuilt every 20 years in keeping with the Shinto idea of death and rebirth (the next rebuilding will be in 2013). This ranks very high on the list of places you will never go because the only person who can enter is the priest or priestess and he must be a member of the Japanese imperial family. So unless we have a Japanese prince or princess reading the site, no one here will ever see anything more than the thatched roof of the Ise Grand Shrine.
2. Mount Weather Emergency Operations Center
Mountweatherfema
This is a place that is not only closed to the public, but it is a place that the public hope to never have to enter! In most “end of the world” films we see these days, there is always a highly classified area where US government officials and a chosen few get to go in the hopes that they can escape the impending doom. The Mount Weather Emergency Operations Center is the real thing. It was set up in the 1950s due to the cold war but continues to operate today. It is a “last hope” area. For obvious reasons its operations are highly classified. It is run by the Federal Emergency Management Agency (FEMA). The center is already functioning and even in small local disasters in the US, much of the telecommunications traffic is routed through it.
1. RAF Menwith Hill
071105 Menwith2 0
RAF Menwith Hill is a British military base with connections to the global ECHELON spy network. The site contains an extensive satellite ground station and is a communications intercept and missile warning site and has been described as the largest electronic monitoring station in the world. The site acts as a ground station for a number of satellites operated by the US National Reconnaissance Office, on behalf of the US National Security Agency, with antennae contained in a large number of highly distinctive white radomes, and is alleged to be an element of the ECHELON system. ECHELON was reportedly created to monitor the military and diplomatic communications of the Soviet Union and its Eastern Bloc allies during the Cold War in the early 1960s, but since the end of the Cold War it is believed to search also for hints of terrorist plots, drug dealers’ plans, and political and diplomatic intelligence. It has also been involved in reports of commercial espionage and is believed to filter all telephone and radio communications in the nations which host it – an extreme violation of privacy.

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