23-07-2012, 12:14 PM
FAILURE ANALYSIS AND ALTERATION OF RECYCLE GAS BLOWER
FAILURE ANALYSIS.ppt (Size: 825.5 KB / Downloads: 153)
INTRODUCTION
The Recycle Gas (RG) blower is used in Pigment Processing Plant(PPP) of Kerala Minerals And Metals Limited (KMML).The section deals with conversion of Beneficiated Illuminate to Rutile Titanium Dioxide.
The blower used in PPP section is manufactured by TLT Egg India Ltd, Ahmadabad.
Significant machine in KMML
PLANT PROFILE
KMML is India’s only rutile grey titanium dioxide faculty through chlorine route.
The trade name of KMML product is KEMOX.
Products have many applications in plants like Plastics, medicines and cosmetic industries.
KMML was established by a private enterprise in 1932 as F.X. Perriera and Sons P Ltd During 1956.this concern was taken over by state government as an ltd company with effects from 1972 with its present name.
PIGMENT PRODUCTION PLANT
PPP consists of following units
1. Raw material handling unit (U-100)
2. Chlorination Unit (U-200)
3. Oxidation Unit (U-300)
4. Pigment production unit (U-400)
5. Chemical storage (U-500)
In U-100, raw materials like BI,PC are stored in their respective storages.
In chlorination unit (U-200) ,the illuminate is
chlorinated with chlorine gas to form Titanium tetra Chlorine(TiCl4)
Oxidation plant (U-300) oxidation takes place TiCl4 is converted to TiO2, here chlorine gas is liberated.
The liberated chlorine gas is serrated in the pigment separator, the gas is recovered,cooled,dried and compressed to enable it flow up in to chlorine.
BLOWERS
Gas turbo machinery- gas is compressed and moved by the dynamic action of rotating vanes.
Exhauster- remove gas from a process and discharge it to atmosphere
Booster- raise the pressure of a system that is already in atmospheric pressure
ELECTRIC MOTOR
Directly driven – impeller has its own shaft, this shaft is directly coupled with the motor.- optimum speed cannot be achieved.
Belt driven- any speed may be achieved by choosing the correct pulley ratio & fan selection is simple.
VIBRATION ANALYSIS
It is the back & forth movement from rest.
Useful technique to control machinery condition
Measuring and noting vibration characteristics mechanical defects are identified
Help to take appropriate action before the failure occurs
BENEFITS OF VIBRATION ANALYSIS
Prolongs machinery life.
Minimize unscheduled down time.
Eliminates unnecessary overhauls.
Eliminates stand by equipment.
Provides more efficient operation.
Increases machinery safety.
Improve quality of performance.
RECYCLE GAS BLOWER AT KMML
Single inlet centrifugal fan.
The impeller is arranged on the shaft
Bearing nearer to impeller is located bearing(B1), other one is no located bearing(B2).
Motor of 250KW drives the impeller fan at a speed of 2980 rpm.
FAN
Unit is a single inlet centrifugal fan.
Bearings are outside the casing.
Impeller is arranged on one shaft end.
Stator parts of the impeller can be replaced with out any difficulties.
The rotor consist of shaft impeller, coupling and Labyrinth seal.
Impeller draws the gas through a control butterfly valve.
SHAFT
Made of stainless steel (SS 31610).
Supported by two bearings.
Impeller attached to shaft by means of washer, bolt and securing plate.
The threaded centre holes for mounting the bearing, the coupling and the impeller.
BEARING ASSEMBLY
Plummer block bearing consist of located& non- located bearing.
located is cylindrical roller bearing of NU design(Nu-2220).
Non Located bearing is Deep Groove ball bearing (SKF 6318).
Lubrication is provided by flinger.
BALANCING OF BLOWER ROTOR
What is Un Balance in Rotating Parts?
Unbalance is caused by the displacement of the mass centerline from the rotor's axis by an eccentricity in the distribution of the rotor mass. In simpler terms, due to centrifugal force, the "heavy" point of a rotor exceeds the centrifugal force exerted by the light side of the rotor and pulls the entire rotor in the direction of the heavy point. Balancing is the correction of this phenomena by the removal or addition of mass to the component to compensate for centerline error.