Promac Engineering Industries Ltd, was established in the year 1972 and its modern and full

fledged manufacturing works is located in Bangalore, India.

Promac has successfully executed modern cement plants in India and overseas and also

manufactured and supplied specialized equipment for various process industries such as

Fertilizer, Iron & Steel, Bulk Material Handling Systems, Sinter Plants, etc.

Promac provides comprehensive and integrated engineering services from planning and

design to construction and commissioning of cement and other process plants, meeting Indian

and International standards.

Asano Roller Vertical Mill ( AVM ) which is being indigenously manufactured by Promac is one

of the most advanced Vertical Roller Mills in the world. It is designed and manufactured based

on the know how from Taiheiyo Engineering Corporation ( TEC ), JAPAN.

View of Promac’s Engineering Works, Bangalore, India

INDIA

(Promac’s Works)

“Design, Manufacture & Supply of engineering products and customized solutions &

systems which conform to the relevant national and international standards and to

enhance customer satisfaction with respect to quality and delivery on continual

improvement basis by involvement of people”

Promac’s Global Footprint

PROMAC, established more than three decades ago, is one of the

leading heavy engineering industries in India, with expertise in the

manufacture and supply of specialized heavy equipments and process

plants on turnkey basis.

Promac has complete design, manufacture and installation

capabilities under one roof.

Promac has an exclusive technical collaboration with Taiheiyo

Engineering Corporation, Japan for the manufacture of Asano

Vertical Roller Mills, in India to the high quality standards set by

their collaborators.

The Asano Vertical Roller Mill is a mill originally developed by Nihon Cement Co. Ltd. the

largest cement producer in Japan. It is named after their founder Mr. Soichiro Asano and

utilizes the cream of their technology developed over 100 years of cement production.

* ASANOTEC Ltd. ( Engineering Division of the erstwhile Nihon Cement Company) in the

Year 2000 merged with the engineering division of two major Industrial houses of Japan

namely Onoda Engineering Co. Ltd., and CHICHIBU Engineering & Consulting Co. Ltd. The

merged company is now known as Taiheiyo Engineering Corporation (TEC).

This mill, which is designed from the standpoint of the user, features outstanding efficiency

and safety and requires minimum maintenance. It incorporates a wealth of know how based

on vast amount of data. The Asano Vertical Roller Mill which performs grinding and drying

simultaneously, comes as a series in various sizes. It is used in many fields of application

such as cement raw materials, coal, slag, bauxite and other mineral grinding .

TECHNOLOGY

MANUFACTURE

WORKING PRINCIPLE

MILL DESIGN FOR LARGE CAPACITY

MILL DESIGN FOR SMALLER CAPACITY

Reducer

Classifier

The Asano Vertical Roller Mill (AVM) performs simultaneous

operations such as blending, grinding, classifying and conveying

through air flow.

The material is fed on to the center of the table by a feed chute at a

constant rate. The rotating table spreads the material across and

the material is crushed and ground between the table and the

rollers. The material is ground to the required fineness by controlling

the grinding force with the help of hydraulic pressure.

The ground material is dried continuously with hot air during

grinding and pneumatically lifted up to the classifier along with the

air flow.

The product is classified to the required particle size in the

classifier before it passes along with the air flow through the gas

duct. The coarse size material from the classifier falls on to the table

for further grinding. The particle size of the product can be achieved

easily by varying the speed of the classifier rotor with the help of

variable speed drive unit.

The grinding roller tyres and table liners can be replaced or reversed

by swinging out the roller assembly.

The construction of Asano Vertical Roller Mills varies for larger and

smaller capacities to make it cost effective without sacrificing the

efficiency and performance of the mill.

GRINDING SYSTEM WITHOUTEXTERNAL MATERIAL RE-CIRCULATION

This system is designed, with high velocity gases entering the mill through the

nozzle ring which lifts up the complete ground material ( consisting of fine and

coarse ) from the table to the classifier, thus eliminating material circulation

through nozzle ring. However, this system leads to high pressure drop across

the mill necessitating a circulating fan with higher pressure and power

demand.

GRINDING SYSTEM WITHEXTERNAL MATERIAL RE-CIRCULATION

This system is designed, for optimum velocity gases entering the mill through

the nozzle ring and lift up only the ground material along with fine grit upto the

classifier and the course material falls through the nozzle ring. Hence this

system needs external material circulation arrangement as the quantity of

circulating material will be substantial. However, this system offers a low

pressure drop across the mill thus requiring a circulating fan with lower

power.

CAPACITY IN TPH (BASED ON BOND’S WORK INDEX & PRODUCT FINENESS)

CAPACITY IN TPH (BASED ON HARD GROVE INDEX & PRODUCT FINENESS)

CAPACITY CHART FOR CEMENT RAW MATERIAL GRINDING

CAPACITY CHART FOR COAL GRINDING

AVM 220 Classifier

PROMAC is the first company in India to manufacture Vertical Roller mills 100 %

indigenously with complete drawings and material specifications furnished by their

collaborators, Taiheiyo Engineering Corporation, Japan. The mills are built to the

specification and accuracy standards specified by Taiheiyo Engineering

Corporation, Japan. With the exception of the large size mill main gear reducers

which are imported, the mills are fabricated, machined and assembled at Promac's

own manufacturing shop. All other standard components are procured

indigenously. The very special alloy wear parts such as roller tyres, table liners and

shell liners which are specially developed by Nihon Cement for this purpose are

usually procured from reputed alloy steel foundries.

Promac has an added advantage over its competitors in India, as, it has set up, at its

works, a full scale Asano Vertical Roller Test Mill for grinding samples of cement

raw materials, coal, pet coke and other minerals in order to check the grindability &

power consumption figures. Thus Promac is in a position to offer its esteemed

customers an optimum size of Asano Vertical Roller Mill with required guarantee of

output and power consumption.

The mills are very cost effective being 100% indigenous keeping the high quality

standards and workmanship prescribed by their foreign collaborators.

AVM 240 Middle Shell AssemblyAVM 240 Table and Roller Assemblies

SHOP ASSEMBLY

The Asano Vertical Roller Mills are assembled in

the workshop to ensure easy installation at site

which will also assure minimum erection time and

efficient operation.

TABLE LINER SEGMENT

1. High Grinding Efficiency

2. Low Power Cost

3. Simultaneous Drying, Grinding and Classifying

4. Wide Particle Size Control Range

5. Low Noise and Vibration

6. Ease of Maintenance

7. Use of Highly Wear Resistant Rollers and Table Liners

8. Constant Output

The Rollers and Table Liners have been designed considering the material to be ground .

As a result, high grinding efficiency can be obtained with low power consumption.

Compared with a ball mill, the electrical power consumed per unit quantiy of raw material

is extremely low and moreover the required installation area is much less.

While the raw material is being ground, it also dried by the hot air drawn into the mill and

classified by the inbuilt classifier.

The adoption of a variable speed high efficiency 3rd generation cage type rotary classifier

enables the particle size to be easily controlled over a wide range.

No contact of metal parts enables very low vibration and noise level.

Careful attention has been paid to reduce maintenance work. For example, a hydraulic

roller take-out unit is employed to facilitate roller replacement.

Nihon cement has developed a special high chromium cast steel “Asano Hard” for the

rollers and “Asano Tough” for the table liners which are the wear parts. The wear

resistance of these rollers and table liners are superior. Similar special castings are now

procured indigenously from Alloy Steel Foundries.

A constant output throughout the wear life of the wear plates is possible with the help of

hydro pneumatic roller loading system.

HIGH EFFICIENCY CLASSIFIER

GRINDING ROLLER TYPE

• 100% indigenous except for gear reducer.

• Power and output guarantees based on testing samples in a full

scale Asano Vertical Roller Test Mill installed at Promac’s works.

• Timely supply, Installation, Commissioning & after Sales Support.

AVM 240 Mills for raw material grinding, working in a cement plant in India.

OTHER EQUIPMENTS & PLANTS

• Complete Rotary Kiln Cement Plants.

• Complete Modern Vertical Shaft Kiln Cement Plants.

• Grinding System by Ball Mills.

• Complete Bulk Material Handling Systems.

• Specialized Equipment for Fertilizer, Iron & Steel and Sinter Plants.

Alahalli, Anjanapura Post,Bangalore - 560062, India.Tel: + 91- 80- 2632 0372. 2632 0432Fax: + 91- 80- 2632 1204E-mail: promac@vsnl.comwww.promacindia.com