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0 2012-11-01 ZhangPengxiao Li Hongsheng Yu Tingwei REV DATE DESCRIPTION DRWN CHKD APPN

OWNER

OWNERS CONSULTANT

EPC CONTRACTOR

EPC CONTRACTORS CONSULTANT

PROJECT TITLE

VUNG ANG 1 THERMAL POWER PLANT 2 x 600MW

CONTRACT No. 251209/LILAMA-NHI

DRAWING TITLE MGS4766 Double-inlet and Double-outlet Coal Mill Instruction

(Dextral) FUNCTION NAME SIGN DATE DRWN Zhang Pengxiao

2012-11-01

CHKD Li Hongsheng 2012-11-01

SUB-CONTRACTOR

APPD Yu Tingwei 2012-11-01

DOCUMENT No. VA1-NHI-00100-M-M1C-MAN 1001

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VIETNAM OIL AND GAS GROUP (PVN) POYRY ENERGY LTD

VIETNAM MACHINERY INSTALLATIONCORPPORATION (LILAMA) FICHTNER GmbH & Co. KG

NORTHERN HEAVY INDUSTRIES GROUP CO.LTD

Instruction

Name Instruction Code DZMS0007.00 SM

Product MGS4766 Double-inlet and Double-outlet Coal Mill Manu. No. M121507

PUR No. Page 2 / 5

Page 2 of 5

1 Application The double-inlet and double-outlet coal mill is used for the

pulverization of coals, and is the main device in the direct

pulverized-coal system. The mill is mainly assembled with the

boiler in large thermal power plant, and can also be used as the

pulverization device in territories of chemical industry, building

material, phosphoresce, etc.

2Specification and Performance Performance Parameter of MGS4766 Double-inlet and

Double-out Coal Mill No. Description Unit Data

1 Output (HGI=42, H2O=8.2%, 92% through 200 mesh) t/h 53.6

2 Effective Internal Diameter of Shell mm 4650

3 Effective Length of Shell mm 6740 4 Rotational Speed of Shell r/min 15.3 5 Effective Capacity of Shell m3 114.46

6 Maximum Ball Charging Quantity t 117

7 Flow Rate of Sealing air kg/h 4950 8 Diameter of Classifier mm 3200

Module mm 25 Tooth Number of Girth Gear 228 9 Gear and Pinion Tooth Number

of Pinion 28

Center distance mm 1080 10 Speed Reducer Transmission Ratio 7.1

Instruction

Name Instruction Code DZMS0007.00 SM

Product MGS4766 Double-inlet and Double-outlet Coal Mill Manu. No. M121507

PUR No. Page 3 / 5

Page 3 of 5

Type Power (kW) Voltage

(V)

Rotational Speed

( r/min) 11 Motor

YTM800-6 2300 10000 993

33Outline Drawing See Drawing No.1

4Structure and Operation Principle The double-inlet and double-outlet coal mill comprises shell,

screw convey device, main bearing, sealing air device, mixer,

Instruction

Name Instruction Code DZMS0007.00 SM

Product MGS4766 Double-inlet and Double-outlet Coal Mill Manu. No. M121507

PUR No. Page 4 / 5

Page 4 of 5

classifier, gear and pinion in transmission system, lubrication for

main bearing, spray lubrication system for gear, differential pressure

detector, electric ear detector, low-speed drive system, etc. The coal

mill is connected with the coal feeder. Simultaneously, the

accessories such as ball charging device, pulverized coal cut-off

valve and sound-proof shield are also assembled.

The raw coal with particle size between 0~30mm is conveyed

to the chute by a coal feeder, and falls into the mixer, in which the

coal is dried by by-pass air. Then the coal goes through the coal

falling pipe, and gets to the screw convey device which is arranged

at the center of the hollow shaft. The convey device rotates with the

shell of the coal mill, and the raw coal gets into the shell through the

hollow shaft. In accordance to the technology of the coal mill, the

shell is charged by steel balls (with diameter of50, 40, 30). During the rotation of the shell, the raw coal is impacted and crushed

by the steel balls into pulverized coal. The primary hot air is blown

into the coal mill through the hollow pipe to dry the raw coal and

pulverized coal, and is blown out of coal mill with pulverized coal

from the opposite direction to the raw coal inlet. The primary hot air

meets the by-pass air at the outlet of coal mill, and gets into the

Instruction

Name Instruction Code DZMS0007.00 SM

Product MGS4766 Double-inlet and Double-outlet Coal Mill Manu. No. M121507

PUR No. Page 5 / 5

Page 5 of 5

classifier through the pulverized coal pipe. The classifier is provided

with adjustable laminas which can be used for adjusting and

controlling the fineness of the pulverized coal. The qualified

pulverized coal is sent to the burner of the boiler through the outlet

at the upper part of the classifier, and the unqualified coal falls back

to the coal mill by gravity for re-pulverization.

5Lubrication System The lubrication system can be divided into the lubrication

system for main bearing, and spray lubrication system for girth gear.

The applications refer to the instructions.

6The installation, commissioning and pre-operation refer to the Double inlet and double outlet coal mill installation operation

instruction.

7The guidelines for operation refer to Double inlet and double outlet coal mill trial operation guide.