Selective Catalytic Reduction (SCR), a process where a gaseous or liquid reductant (most commonly ammonia or urea) is added to the flue gas stream and is absorbed onto a catalyst. The reductant reacts with NOx in the flue gas to form H2O and N2.

Specialty Catalytic Converters are required to make an SCR system work, the current options being a Vanadium based catalyst, or a catalyst with Zeolites in the washcoat. In some jurisdictions use of a Vanadium based catalyst are frowned on (California) and the Zeolite type preferred, however Vanadium ....etc

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pleasre give a ppt on speed control of ac drives using scr.. ....etc

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Selective Catalytic Reduction (SCR), a process where a gaseous or liquid reductant (most commonly ammonia or urea) is added to the flue gas stream and is absorbed onto a catalyst. The reductant reacts with NOx in the flue gas to form H2O and N2.

Specialty Catalytic Converters are required to make an SCR system work, the current options being a Vanadium based catalyst, or a catalyst with Zeolites in the washcoat. In some jurisdictions use of a Vanadium based catalyst are frowned on (California) and the Zeolite type preferred, however Vanadium ....etc

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I request you to send me the application areas of SCR phase angle control using AT89S52. What are the advantages and disadvantages of this method? In today's time, where is it used? What modifications can be made? Please mail the reply on [email protected] or [email protected]
Thank you. ....etc

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difference between chopper fed drives and converter fed drives pdf ....etc

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CHAIN DRIVES IN LOW TORQUE DRIVES AND REDUCING PULSATIONS
INTRODUCTION TO DRIVES

Mechanical components used for power transmission.It may be belt, chain or gear depending on engine design parameters like - Distance between crankshaft and camshaft, engine maximum speed, engine-torque and engine construction cost.- Power transmission is done from one shaft to another shaft which may or may not rotate at same spe ....etc

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PHASE-ANGLE CONTROL OF SCR USING AT89C51
Silicon-controlled rectifiers (SCR) are solidstate semiconductor devices that are usually used in power switching circuits. SCR controls the output signal by switching it ‘on’ or ‘off’, thereby controlling the power to the load in context. The two primary modes of SCR control are phase-angle fired-where a partial waveform is passed to regulate the power.
In the phase-angle controller, the firing pulse is delayed to turn on the SCR in middle of every half cycle. This ....etc

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BRIEF DESCRIPTION OF COMPONENTS:
1) Transformer:-
A transformer is a static device which consists of two or more stationary circuits interlinked by a common magnetic circuit for the purpose of transferring electrical energy between them.
• E.M.F equation of a transformer:
e=4.44Baft
B=maximum flux density in the magnetic circuit.
a=area of cross-section of the core.
f and t are frequency and no. of turns respectively.
• Step up and step down transformer:
A step up transformer is one whose secondary voltag ....etc

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Selective Catalytic Reduction (SCR), a process where a gaseous or liquid reductant (most commonly ammonia or urea) is added to the flue gas stream and is absorbed onto a catalyst. The reductant reacts with NOx in the flue gas to form H2O and N2.

Specialty Catalytic Converters are required to make an SCR system work, the current options being a Vanadium based catalyst, or a catalyst with Zeolites in the washcoat. In some jurisdictions use of a Vanadium based catalyst are frowned on (California) and the Zeolite type preferred, however Vanadium ....etc

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silicon control rectifier -scr

Content

Introduction
What is SCR ?
Characteristic of SCR
Two transistor analog connection
Series connection of SCR
Parallel connection of SCR
Advantages
Disadvantages
Conclusion

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