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What is the working principle of oxygen analyzers(zirconium oxide type) used in CFBC boilers?
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Answer Posted / suresh xavier
there are two parts one is the sensing part and other is
converter. sensing part contains zirconium and heating
mechanism. the main caractristic of Zr. is at higher temp.
(= 750 deg.) the proprty of Zr., it allows the O2 ions to
conduct. to maintain the Zr. at 750 deg. normally we use
platinum electrode on the both side to create a heating
mechanism. when the probe is placed in the flue gas path one
side of the probe will maintaine the span gas (instrument
air contains 21% O2) and the other end is in the flue gas
path contains unknown % of O2. thus it will create a diff.
partial O2 on the each side of the cell. electrode in
contact with higher O2 pressure act as -ve electrode and it
will create an emf. the coverter pck that emf and using the
calibration produce the % O2.
calibration.
for zero calibration use zero gas (0.98% O2 ~~ nitrogen gas)
is used
for span we use 21% O2 (instrument air)
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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
