文档介绍：ELECTRIC EAR
MISSIONNING & MAINTENANCE MANUAL
SUMMARY
1 - PURPOSE 3
2 - MILL LEVEL MEASUREMENT PRINCIPLES 4
- Foreword 4
- Comparison between the different level methods 5
- Noise characteristics of mills 7
- Application of the . 2000 on tube mills in direct firing 8
3 - DESCRIPTION OF THE EOUIPMENT 9
- General presentation 9
- Microphone 11
- Audio signal converter 错误!未定义书签。
- Power supply 12
- Display 13
4 - INSTALLATION OF THE EQUIPMENT 13
- Microphone 13
-Transmitter 14
5 - PRIMARY TESTS BEFORE START UP 14
- Installation check 14
- Audio signal converter 15
6 - START UP CALLBRATION 15
- Calibration of the booster 15
- Calibration of the transmitter 15
7 - NOISE CORRECTION MEASUREMENT 16
8 - SETTING OF THE CONTROL LOOP 17
9 - PERFORMANCE TESTS 18
10 - ANNEXES TO THE MANUAL 18
1 - PURPOSE
The purpose of this present manual is to describe the equipment, Installation missioning procedure of the mill noise level system called “ELECTRIC EAR”. This system can substitute other mill level equipments such as deep tubes P system or mill motor power system.
2 - MILL LEVEL MEASUREMENT PRINCIPLES
- Foreword
A prerequisite for the correct use of horizontal mills (tube mills), for direct firing of pulverized coal, is that the amount of coal inside the mill must be controlled to a "constant level" in order to maintain the air/coal ratio as constant as possible and also to be sure that the grinding is optimum.
From the begining of use of this kind of mill several systems have been envisaged (some of them "accrobatic"), but in fact three types of measurement are today petition.
They are :
- the measure of the mill motor power consumption
- the probe method (deep tubes system)
- the measure of the noise emitted by the mill.
Each of these measures has its own advantages and it is very interresting pare the different solutions in order to adopt the best final we have to k