Oscillation monitor for pulverizer journal assembly
AssigneeALSTOM Technology Ltd
InventorRichard Brian Stone
Life of this patent
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Abstract
A pulverizer 10 includes a journal assembly 19 with a grinding roller 18 that grinds solids in a grinding table 14. The oscillations of the journal assembly 19 are monitored by an angular displacement transducer (ADT) 32 that creates a composite signal. A controller 83 receives the composite signal from the ADT and compares it with known information of the pulverizer 10. It then identifies abnormal situations such as damage to a grinding roll 14, the grinding table 14, the spring assembly 20 and other parts of the pulverizer 10 before they cause major damage.
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A method of identifying potential problems of a pulverizer comprising the steps of:
- providing a pulverizer housing with a rotatable shaft, a grinding table mounted on the rotatable shaft, at least one journal assembly pivotally mounted on the pulverizer housing, a grinding roll coupled to the at least one journal assembly, a spring assembly mounted on the pulverizer housing;
- providing an angular displacement transducer (ADT) coupled to the journal assembly by a coupling and a coupling adapter, with the ADT, coupling and coupling adapter each supported by a mounting bracket for ADT measurement of angular displacement of the journal assembly and electronic signal generation corresponding to the measurement of angular displacement;
- acquiring ADT measurement of angular displacement of the journal assembly over time;
- and
- generating an electronic signal indicating a potential problem with the pulverizer when the measurement of angular displacement is abnormal.
A device for measuring operation of at least one journal assembly pivoting on a trunnion shaft of a pulverizer comprising:
- an angular displacement transducer (ADT) operable to measure degree of rotation of a trunnion shaft;
- a coupling attached between the trunnion shaft and a shaft connected to the ADT to transmit rotation of the trunnion shaft to the ADT for continuous ADT to measurement of the trunnion shaft degree of rotation;
- and
- a controller coupled to the ADT for reading the measured trunnion shaft degree of rotation and for identifying abnormal journal assembly operation conditions.
Dependencies are inferred from the claim text.