14-09-2012, 03:48 PM
NTPC Limited
ntpc 1.docx (Size: 583.65 KB / Downloads: 81)
ABOUT THE COMPANY
Corporate Vision:
“A world class integrated power major, powering India’s growth, with increasing global presence”
Core Values:
B-Business Ethics
C-Customer Focus
O-Organizational & Professional pride
M-Mutual Respect and Trust
I- Innovation & Speed
T-Total quality for Excellence
NTPC Limited is the largest thermal power generating company of India. A public sector company, it was incorporated in the year 1975 to accelerate power development in the country as a wholly owned company of the Government of India. At present, Government of India holds 89.5% of the total equity shares of the company and the balance 10.5% is held by FIIs, Domestic Banks, Public and others. Within a span of 31 years, NTPC has emerged as a truly national power company, with power generating facilities in all the major regions of the country.
GENERATION OF ELECTRICITY FROM COAL
Coal from the coal wagons is unloaded with the help of wagon tipplers in the C.H.P. this coal is taken to the raw coal bunkers with the help of conveyor belts. Coal is then transported to bowl mills by coal feeders where it is pulverized and ground in the powered form. This crushed coal is taken away to the furnace through coal pipes with the help of hot and cold mixture P.A fan. This fan takes atmospheric air, a part of which is sent to pre heaters while a part goes to the mill for temperature control. Atmospheric air from F.D fan in the air heaters and sent to the furnace as combustion air. Water from boiler feed pump passes through economizer and reaches the boiler drum . Water from the drum passes through the down comers and goes to the bottom ring header. Water from the bottom ring header is divided to all the four sides of the furnace. Due to heat density difference the water rises up in the water wall tubes. This steam and water mixture is again taken to the boiler drum where the steam is sent to super heaters for super heating. The super heaters are located inside the furnace and the steam is super heated (540 degree Celsius) and finally it goes to the turbine. Fuel gases from the furnace are extracted from the induced draft fan, which maintains balance draft in the furnace with F.D fan. These fuel gases heat energy to the various super heaters and finally through air pre heaters and goes to electrostatic precipitators where the ash particles are extracted. This ash is mixed with the water to from slurry is pumped to ash period. The steam from boiler is conveyed to turbine through the steam pipes and through stop valve and control valve that automatically regulate the supply of steam to the turbine. Stop valves and controls valves are located in steam chest and governor driven from main turbine shaft operates the control valves the amount used. Steam from controlled valves enter high pressure cylinder of turbines, where it passes through the ring of blades fixed to the cylinder wall. These act as nozzles and direct the steam into a second ring of moving blades mounted on the disc secured in the turbine shaft. The second ring turns the shaft as a result of force of steam. The stationary and moving blades together.
AUTOMATION : THE DEFINITION
The word automation is widely used today in relation to various types of applications, such as office automation, plant or process automation.
This subsection presents the application of a control system for the automation of a process / plant, such as a power station. In this last application, the automation actively controls the plant during the three main phases of operation: plant start-up, power generation in stable or put During plant start-up and shut-down, sequence controllers as well as long range modulating controllers in or out of operation every piece of the plant, at the correct time and in coordinated modes, taking into account safety as well as overstressing limits.
AUTOMATION LAB
This lab deals in automating the existing equipment and feeding routes. Earlier, the old technology dealt with only (DAS) Data Acquisition System and came to be known as primary systems. The modern technology or the secondary systems are coupled with (MIS) Management Information System. But this lab universally applies the pressure measuring instruments as the controlling force. However, the relays are also provided but they are used only for protection and interlocks. Once the measured is common i.e. pressure the control circuits can easily be designed with single chips having multiple applications. Another point is the universality of the supply, the laws of electronic state that it can be any where between 12V and 35V in the plant. All the control instruments are excited by 24V supply (4-20mA) because voltage can be mathematically handled with ease therefore all control systems use voltage system for computation. The latest technology is the use of ‘ETHERNET’ for control signals.
ntpc 1.docx (Size: 583.65 KB / Downloads: 81)
ABOUT THE COMPANY
Corporate Vision:
“A world class integrated power major, powering India’s growth, with increasing global presence”
Core Values:
B-Business Ethics
C-Customer Focus
O-Organizational & Professional pride
M-Mutual Respect and Trust
I- Innovation & Speed
T-Total quality for Excellence
NTPC Limited is the largest thermal power generating company of India. A public sector company, it was incorporated in the year 1975 to accelerate power development in the country as a wholly owned company of the Government of India. At present, Government of India holds 89.5% of the total equity shares of the company and the balance 10.5% is held by FIIs, Domestic Banks, Public and others. Within a span of 31 years, NTPC has emerged as a truly national power company, with power generating facilities in all the major regions of the country.
GENERATION OF ELECTRICITY FROM COAL
Coal from the coal wagons is unloaded with the help of wagon tipplers in the C.H.P. this coal is taken to the raw coal bunkers with the help of conveyor belts. Coal is then transported to bowl mills by coal feeders where it is pulverized and ground in the powered form. This crushed coal is taken away to the furnace through coal pipes with the help of hot and cold mixture P.A fan. This fan takes atmospheric air, a part of which is sent to pre heaters while a part goes to the mill for temperature control. Atmospheric air from F.D fan in the air heaters and sent to the furnace as combustion air. Water from boiler feed pump passes through economizer and reaches the boiler drum . Water from the drum passes through the down comers and goes to the bottom ring header. Water from the bottom ring header is divided to all the four sides of the furnace. Due to heat density difference the water rises up in the water wall tubes. This steam and water mixture is again taken to the boiler drum where the steam is sent to super heaters for super heating. The super heaters are located inside the furnace and the steam is super heated (540 degree Celsius) and finally it goes to the turbine. Fuel gases from the furnace are extracted from the induced draft fan, which maintains balance draft in the furnace with F.D fan. These fuel gases heat energy to the various super heaters and finally through air pre heaters and goes to electrostatic precipitators where the ash particles are extracted. This ash is mixed with the water to from slurry is pumped to ash period. The steam from boiler is conveyed to turbine through the steam pipes and through stop valve and control valve that automatically regulate the supply of steam to the turbine. Stop valves and controls valves are located in steam chest and governor driven from main turbine shaft operates the control valves the amount used. Steam from controlled valves enter high pressure cylinder of turbines, where it passes through the ring of blades fixed to the cylinder wall. These act as nozzles and direct the steam into a second ring of moving blades mounted on the disc secured in the turbine shaft. The second ring turns the shaft as a result of force of steam. The stationary and moving blades together.
AUTOMATION : THE DEFINITION
The word automation is widely used today in relation to various types of applications, such as office automation, plant or process automation.
This subsection presents the application of a control system for the automation of a process / plant, such as a power station. In this last application, the automation actively controls the plant during the three main phases of operation: plant start-up, power generation in stable or put During plant start-up and shut-down, sequence controllers as well as long range modulating controllers in or out of operation every piece of the plant, at the correct time and in coordinated modes, taking into account safety as well as overstressing limits.
AUTOMATION LAB
This lab deals in automating the existing equipment and feeding routes. Earlier, the old technology dealt with only (DAS) Data Acquisition System and came to be known as primary systems. The modern technology or the secondary systems are coupled with (MIS) Management Information System. But this lab universally applies the pressure measuring instruments as the controlling force. However, the relays are also provided but they are used only for protection and interlocks. Once the measured is common i.e. pressure the control circuits can easily be designed with single chips having multiple applications. Another point is the universality of the supply, the laws of electronic state that it can be any where between 12V and 35V in the plant. All the control instruments are excited by 24V supply (4-20mA) because voltage can be mathematically handled with ease therefore all control systems use voltage system for computation. The latest technology is the use of ‘ETHERNET’ for control signals.