Ball mills type UMS, TMS and TUMS ■ Up-to-date technology based on
proven design ■ Multi-purpose concept featuring
standard modules ■ Customised sizing and layout to
specific requirements ■ 120 mill sizes with capacities
ranging from 1,000 to 10,000 kW
MILL SYSTEMS
Main features
• Shell supported ball mill of well-proven design. • Either side or central drive. • Considerably shorter overall length than mills with trunnion bearings. • Grinds all types of cement and similar products in open or closed circuit to any fineness required. • Designed for drying of moist mill feed materials. • Large through-flow area ensures low pressure drop.
Versatile system based on standard modules The Unidan mill, type UMS, is designed for grinding of clinker, gypsum and dry or moist additives to any type of cement and for separate dry grinding of similar materials with moderate moisture content. The mill types TMS and TUMS are fully and semi air-swept mills respectively, designed for dry grinding of raw materials for cement manufacture. All mill types may operate in either open or closed circuit and with or without pre-grinder, to achieve maximum overall grinding efficiency and high flexibility in terms of product quality. All mill types have large through-flow areas, which allows the mill to operate with large volumes of venting air and a low pressure drop across the mill. Hence the energy consumption of the mill ventilation fan is low. The mills consist of standard modules and are easily adapted to specific requirements in terms of plant layout, mill drive, lining types and end product specifications.
Cement grinding In two-compartment finish-grinding UMS mills, the first, coarse grinding compartment is provided with a step lining that is suitable for large grinding media and ensures optimum lifting of the mill charge. The shell lining in the second compartment or in a one-compartment finish-grinding mill is a corrugated lining designed to obtain maximum power absorption and grinding efficiency. For special applications a classifying shell lining may be adopted for fine grinding in the UMS mill. The ball charge in the UMS mill consists of grinding media in various sizes to ensure optimum grinding efficiency and easy maintenance. The size distribution of the grinding media in the coarse grinding compartment is designed to just crush the coarsest particles in the mill feed material and to ensure adequate fineness of the material passing the diaphragm. For fine grinding, the charge consists of small balls, which ensures the best possible grinding efficiency without obstructing the material flow through the ball charge.
In two-compartment UMS mills, the STANEX diaphragm between the grinding compartments effectively screens the material passing from the coarse to the fine grinding compartment. The diaphragm is fitted with adjustable lifters to ensure an adequate level of material in the preceding compartment. The STANEX diaphragm is suitable for all applications, even for mills operating with high material flow rates and moist mill feed. An internal water cooling system may be installed in one or both grinding compartments to optimise mill performance and to ensure an appropriate material temperature inside the mill and at the mill discharge end. The material temperature in the diaphragm, monitored by the Indutherm equipment, and the temperature of the mill discharge material control the injection of water into the first and second compartments, respectively. If the materials to be ground contain more water than can be dried off in the first compartment, the UMS mill will be fitted with a bolted-on drying compartment with lifters. A seal between the stationary inlet and the drying compartment minimises ingress of false air. Mill performance is monitored by continuous measurements of the material and air temperatures as well as the pressure at the mill exit. The venting of the mill is adjusted by a damper in the inlet to the mill fan. The level of material in the mill is monitored by an electronic device (a Folaphone) that measures the noise emission from the mill. For UMS mills operating in closed circuit, the circulation load is monitored by weighing the flow of reject material from the separator.
Section of mill body designed for central drive
STANEX diaphragm with adjustable lifters
Ball mill – UMS 2
1
6
3
4
5
7
8
1
Stationary inlet
2
Mill shell with welded-in slide rings and flange for girth gear.
3
Slide shoe bearing
4
STANEX diaphragm with adjustable lifters
5
Outlet grate with adjustable lifters
6
Lining of coarse grinding compartment
7
Lining of fine grinding compartment
8
Girth gear with casing
Proven mill design
Raw material grinding
Slide shoe bearing
In raw material grinding mills (types TMS and TUMS) the first section of the mill body is a built-in drying compartment fitted with lifters. Hot drying air enters through an insulated inlet with feed chute. The dried material is conveyed from the drying compartment to the grinding compartment by built-in lifters and by the flow of air. The grinding compartment has a classifying lining and a ball charge designed for grinding in one compartment only. The TMS mill type is fully airswept, in other words the drying air sweeps all the ground material out of the mill and lifts it to the separator, whereas the TUMS mill type is semi air-swept, which means that the ground material is carried to the separator by an elevator except the finest portion which is conveyed by the mill exit air.
Proven mill design with innovative features The mill types UMS, TMS and TUMS are shell-supported ball mills resting on slideshoe bearings with two slide-shoes at each end of the mill. The UMS and the TUMS mills may be supplied with either side drive or central drive, whereas the TMS type is always with a side drive.
Inlet to UMS mills
Mill body. The mill body consists of an allwelded mill shell and a T-sectional weldedup slide ring at either end, the cylindrical part of which is welded onto the ends of the shell. Side-driven mills have a reinforced shell section with a flange for bolting-on the girth gear. Centrally driven mills have an outlet cone with large openings for material and venting air. The large diameter of this cone is welded onto the cylindrical part of the outlet slide ring, while the small diame-
ter of the cone has a flange for bolting-on the coupling of the central drive. The mill shell has four manholes, two for each grinding compartment. Slide-shoe bearings. Each slide ring runs in a bearing with two self-aligning slide shoes. One of the slide shoes at the drive end of the mill is fixed in axial direction; the others are supported by rollers on heavy bedplates to allow longitudinal thermal expansion and contraction of the mill body. The slide shoes are water-cooled, and each bearing is provided with a panel enclosed lubrication unit including oil tank, motorised low and high pressure oil pumps as well as an oil conditioning circuit with motorised pump for heating/cooling and filtration of the oil. Each bearing is enclosed in a dustproof and oiltight casing with inspection doors. The bearings and the lubrication units include the necessary safety equipment for monitoring the bearing temperature, the oil flow and the oil pressure, connected to a local control panel with safety interlocking for both bearings. Inlet. Mills of the UMS type have a stationary steel plate inlet funnel that leads the venting air into the mill through a protruding central cone bolted to the web of the slide ring. The funnel is equipped with a throttle valve and a pressure monitor to adjust the pressure at the inlet end, thus preventing dust emission from the inlet. The feed chute, which is lined with boltedon wear plates, slopes down through the air funnel to the mill inlet opening. Mill types TUMS and TMS have a stationary inlet, which leads the material and the drying air into the drying chamber through
a large opening in the web of the slide ring. Between the funnel and the mill is an air seal and the air intake is lined with refractory castable. Outlet. Mill types UMS and TUMS have a stationary steel plate outlet casing that is insulated with mineral wool and provided with seals between the casing and the rotating outlet cone. The outlet end of the fully air-swept TMS mill has a bolted-on cylinder including lining, lifters and flights that reaches into the stationary outlet funnel. Here, material precipitated from the air is led back into the mill. The outlet funnel is lined with wear plates and provided with a flange connection to the riser duct. An air seal is fitted between the stationary funnel and the rotating parts. Mill linings and internal fittings. In the UMS mill, the inlet cone and the inner side of the inlet slide ring web exposed to wear are protected by bolted-on, wear-resistant lining plates. The first compartment shell lining in UMS mill is a highly wear-resistant step type lining. A rubber backing prevents damage to the mill shell and lowers the noise emission from the mill during operation. The shell lining in the second compartment or in one-compartment UMS mills is of the semi-boltless corrugated or classifying types. With both lining types, boltless lining bars are fitted between bolted-on lining rings, and a dovetail assembly between the parts keeps the boltless bars in place. The STANEX diaphragm used for twocompartment UMS mills is of a rigid design and is supported on a ring of cast steel segments that are bolted to the mill shell. The structural parts consist of a rigid mild steel supporting plate with spacers, onto which is bolted a mild steel front plate with large openings. The diaphragm is fitted with radial, adjustable lifters between the supporting plate and the front plate and with a central screen plate with support. Facing the first compartment the STANEX
diaphragm is provided with segmented wear resistant grates bolted onto the front plate with throughgoing bolts. The openings in the front plate allow screened material to pass the diaphragm. The downstream side of the diaphragm is provided with highly wear resistant segmented lining plates. At the discharge end of the UMS (and the TUMS) mills, the wear resistant outlet grate is fitted on a supporting structure which is bolted onto the web of the slide ring. Also the discharge end is with radial, adjustable lifters behind the outlet grate. The TMS and TUMS mills have a highly wear resistant bolted-on lining, comprising a step lining for the first 1.5 metres of the grinding compartment, followed by a classifying lining. Water cooling. A separate unit comprising water tank, pump(s) and valves for internal water cooling of the material in one or in both compartments of the UMS mill is usually provided. The flow of cooling water into the outlet end of the mill is controlled by the temperature of the mill discharge material. The water cooling into the inlet end is controlled from a thermocouple in the diaphragm, connected to a wireless transmission system (Indutherm). Special nozzles ensure optimum water spray without pressurised air. The nozzle and internal piping for water injection into the second compartment of the UMS mill with central drive rotate with the mill. The connection between this internal piping and the stationary external water supply system is established via a specially designed stuffing box.
STANEX diaphragm
Stuffing box for mill with central drive
A wide range of equipment
Machinery range 19.0
The UMS cement mill system comprises 120 combinations of mill diameters and mill lengths with capacities ranging between approximately 1,000 and 10,000 kW as illustrated in the chart. All mill sizes may be supplied either with side drive or with central drive, and with different types of gear units. Special drive types such as double side drive or flange mounted planetary gear unit for central drive are also available.
18.0 17.0
Mill length [m]
16.0 15.0 14.0 13.0 Mill diameter [m] D=5.8 D=5.4 D=5.0 D=4.6 D=4.2 D=3.8 D=3.4
12.0 11.0 10.0 9.0
9,500
10,000
9,000
8,500
8,000
7,500
7,000
6,500
6,000
5,500
5,000
4,500
4,000
3,500
3,000
2,500
2,000
1,500
500
1,000
8.0
Mill power [kW]
1 3
Mill diameter
UMS mill with central drive
6 5 2
4
Mill length
1
UMS mill with side drive
3
Mill diameter
1
2 3 4 2
5 6
6
4
Inlet Outlet Slide shoe bearing Main gear Mill motor Barring device
5
www.flsmidth.com Up-to-date addresses of worldwide subsidiaries and sales offices are available from our website
USA
INDIA
DENMARK
F.L.Smidth Inc. 2040 Avenue C Bethlehem, PA 18017-2188 Tel: +1 610-264-6011 Tel: +1 800-523-9482 Fax: +1 610-264-6170 E-mail:
[email protected]
Fuller India Limited Capital Towers 180, Kodambakkam High Road Nungambakkam Chennai 600 034 Tel: +91 44-827-6030/8228623 Fax: +91 44-827-9393 E-mail:
[email protected]
F.L.Smidth A/S Vigerslev Allé 77 DK-2500 Valby Copenhagen Tel: +45 36 18 10 00 Fax: +45 36 30 18 20 E-mail:
[email protected]
07-01-259 Gramstrup Design ApS
Data in this brochure is intended for preliminary project planning only. Manufacturer reserves the right to modify equipment details and/or specifications without notice.
