KIM THU SÉT INDELEC

A special development for the burning of low-calorific gases
The LOMA-heater combined with a multiple lance burner represent a special development and is characterized by the following features:
minimum stored heat,
low preheating period only when starting from the cold state,
wide control range,
plant can be immediately started and shut down,
no supporting burner necessary,
no emergency chimney necessary.
The multiple lance burner (1) is made up of a number of individual nozzles, for both low-calorific gas and combustion air. Both constituents meet within the nozzle mixture; the basic requirement for efficient combustion is therefore achieved.
Owing to this flow design, it is possible to carry out the major portion of the combustion process in a very small burner muffle (3).
To start the hot gas generator, is it essential to use a start burner (2) installed co-axially.
This start burner has the function of heating up the interior wall of the burner muffle to a surface temperature of approx. 700 °C - the inflammability limit temperature of CO. After the main burner has been started, the start burner is switched off.
At the same time, the start burner can be sized so that an entire plant can be heated up. e.g. for the dry-grinding of coal, dry-grinding of slag etc.
To ensure a stepless operation, the capacity ranges of the main burner and the start burner are designed to overlap.
The main burner has a control range of 1:10, the start burner control range is 1:5 - 1:8. Every essential operating point within the control range of approx. 1:50 - 1:70 can therefore easily be achieved.
The hot flue gases escaping from the burner muffle (3), are in the area of the perforated jacket (4), mixed with the process air to be heated up, which is supplied to the hot gas generator via the spiral housing (5).
LOMA-heater Type LF 20 with a multiple lance burner for combustion of blast furnace gas at steel plant Dillingen, Germany with a heat capacity of 15 x 106 kJ/h
Its main application is the burning of blast furnace gas. By means of this combustion system, low-calorific gases with a thermal value from 2,500 kJ/m3 (S.T.P.) are burned without a supporting burner.
Such hot gas generators are used in connection with Loesche roller grinding mills in dry-grinding plants to process coal for the smelting of iron ore.
Since 1991 fourteen hot gas generators - as described - have been built and put into operation. The thermal output of these plants is between 16.7 x 106 kJ/h and 54 x 106 kJ/h.

BỘ TIẾT CHẾ LƯU LƯỢNG LOESCHE

MÁY NGHIỀN THAN LOESCHE

Coal mills
Since 1925 - for over 80 years - we have been concerned with pulverized fuel for kiln and boiler firing. For all grades - hard coal, woody lignite and lignite as well as anthracite coal and petroleum coke - we design and build, on turnkey basis, safe and reliable dry-grinding installations for pressure, suction or inert operation, equipped with Loesche pressure-shock-resistant grinding mills.
2 Loesche grinding plants for predried lignite coal.
Grinding rollers and mill lining of a Loesche 2-roller coal mill.
The Loesche coal mill is a modular and flexible design. The modular design allows a 2, 3 or 4 roller mill to be custom built to suit the required output. This saves time and money from the design to the erection stage.
The ground product quality is consistently high irrespective of plant capacity. During start, stop and full or partial-load operation, no contact takes place between the grinding elements to disturb the vibration free running. A flat grinding track - individually guided - adjustable rollers and a roller swing-out device for servicing ensure that the Loesche coal mill achieves almost 100% availability. The service for the mill is easy to maintain.
The drawing shows the operating principle of the Loesche coal mill in the present design for a production capacity up to 200 t/h.
Intro
Dry-grinding plants
Pioneer and pacemaker in grinding
For decades Loesche has successfully claimed the lead in technological development of efficient mills.
Cement raw materials
Loesche roller grinding mills are applied with great success to the most varied raw materials.
Cement clinker and blast furnace slag
The total process is executed in one single machine: Loesche's 2+2 and 3+3 technology.
Rocks, clays, earths, minerals and ores
For the mineral and mining industry we design and build dry-grinding and interparticle comminution plants.
Coal mills
For over 80 years we have been concerned with coal preparation technology.
Hot gas producers
With the hot gas system LOMA heater / multiple lance burner, low-calorific gases are burned very efficiently without a supporting burner.
Classifiers
Our speciality, the Loesche high efficiency classifier, produces products in a homogeneous field of streaming forces in conjunction with centrifugal forces.

Last update: January 22, 2007

INDELEC LIGHTING PROTECTION

Lightning protection
Two types of protection exist : protection against direct lightning strike and protection against surge due to lightning activity.



Protection against direct lightning strikes
Lightning rods are dedicated to the protection of structures against direct lightning strikes and then to conduct the lightning current safely to the ground (through the down conductors and the earthing system)
Lightning rod history starts in 1753.



1753
Benjamin FRANKLIN invents the lightning conductor. He was the first to demonstrate the electrical nature of lightning with his now famous «kite experiment». At more or less the same time in France, DALIBARD confirms the theory in Marly with his experiment with a metal rod which was electrified during storms. Jacques de ROMAS also reaches this conclusion, with a different kite than FRANKLIN’s : a copper wire is winded around the rop to the ground. The discovery rapidly lead to an extraordinary fascination for lightning conductors. They began to appear first of all on church spires and shortly afterwards on buildings. This trend in lightning conductors even gave rise to a number of original inventions including a certain lightning conducting umbrella.



1880
A Belgian physicist, named MELLSENS, recommends protecting buildings by covering them with metal wires connected to a series of spikes on the roof and then well earthed. This was the very first meshed cage.



1914
First attempts to improve on the single lightning rod by the Hungarian-born SZILLARD and the Frenchman, DOZÈRE.



1986
Following several years’ research resulting in improved awareness of the physical properties of lightning, a new type of lightning conductor is developed giving stronger ionisation around the terminal through the use of electrical equipment independent of any external power source. Indelec decides to develop this new theory and registers its first world patent for the PREVECTRON® technology. Immediate national recognition for the initiative comes in the form of two awards for innovation.



1996
The PREVECTRON® lightning conductor has been used successfully in France and throughout the world for 10 years. Making the most of the 1993, 1994, 1995 and 1996 on-site test campaigns carried out in real- life lightning conditions in the USA and in France by the C.E.A. (French Atomic Energy Commission), Indelec has developed the latest addition to their range of lightning conductors : the PREVECTRON®2.



1999
Indelec is certified ISO 9002 delivered by BVQI for manufacturing and marketing the PREVECTRON®.



2000
Indelec opens its firts foreign subsidiary on the american continent in Florida.



Several standards are available, depending on the type of air terminals :



Early Streamer Emission Lightning conductors :

NFC 17-102 (France)
UNE 21 -186
I 20
JUS N.B4.810
STN 3-1391




Single rods and Meshed cage :
Single rods and meshed cage :

NFC 17-100
CEI 62 305 Part 1 to 4
BS 6651
DIN 48-850
NFPA 780




Early Streamer Emission Lightning conductors
Single rods and Meshed cage
Thanks to its wide range of lightning rods, INDELEC is complying all the existing standards.



Protection against the indirect effects of a lightning discharges
The Surge Protection Devices (SPD) are designed to limit the transitory excess voltage caused by a lightning discharge. It can affect every types of cable for power supply, telecom lines, computer networks, remote control system, TV and CCTV network….

Lightning can cause these phenomena either directly through a discharge on high voltage overhead power lines or indirectly by coupling. The choice of the SPD is based on each model nominal and maximum discharge current, maximum permissible operating voltage, protection level as well as power supply distribution set-up.



The following standards are available for choosing and installing the SPD’s :

CEI 61643-11 : Low voltage SPD
CEI 61643-12 : Installation of low voltage SPD
NFC 61740/95 : Low voltage SPD
NFC 15100 - 534 & 443 : Protection against overvoltage due to lightning or industrial interferences

Máy nghiền Loesche 2+2 và 3+3

Loesche's 2+2 and 3+3 technology
for clinker and slag grinding

The first Loesche 2+2 mill for clinker and slag grinding at Pu-Shin plant of Lucky Cement, Taiwan, R.O.C.
Loesche introduced the 2+2 technology for clinker and slag grinding in 1994 into the market. The first mill of this kind started up in 1994 in the Pu-Shin plant of Lucky Cement, Taiwan, R.O.C.. It produces 500.000 t/y of a 3.400 cm²/g OPC and 250.000 t/y of ground granulated blast furnace slag (GGBS) of 4.300 cm²/g. The second mill started up early 1995 for GGBS only.
Since then the 2+2 system became a widespread reliable technology for clinker and slag grinding. Until the end of 2002 36 mills have been installed with a total power of approx. 110.000 kW and a production capacity in total of approx. 5.500 t/h.


Loesche´s first 3+3 cement mill installation at Orissa Cement, India. The world´s largest cement mill with
300 t/h
It was not until 2003 that demand for mills in the cement industry began to pick up slowly. Now, however, customers were looking for bigger and more powerful mills. Loesche received orders from Orissa Cement and Dalmia Cement in India for what was at the time the largest cement mill in the world, the LM 56.3+3. The mill has the capability of producing over 300 t/h. In the first 20 hours of operation, the plant OCL in Rajgangpur produced an astonishing 6.300 tonnes of cement.

The mills produce OPC as well as cements with interground additives like blast furnace slag, limestone, pozzolana and fly ash. The excellent drying capability of the mills allow the use of moist additives. In many plants the high flexibility of the system is utilized and between 2 and 6 different types of cement are produced in the same mill. Switching from one product to the other can be done within minutes.

GGBS can be produced in Loesche mills with the 2+2 and 3+3 technology highly energy efficient. The drying capability of the Loesche mill allows the use of slag with moisture contents of 15 % and more. Surface areas of more than 6.000 cm²/g (BLAINE) have been reached. Power savings of 50 % and more in comparison to ball mills can be achieved.

MÁY NGHIỀN LOESCHE ( ĐỨC )

Cement raw materials
More than 100 years we have been concerned with comminution. Loesche roller grinding mills remain the heart of our dry-grinding installations in the cement industry worldwide.
The Loesche grinding principle combines a horizontal grinding table with large tapered roller under hydropneumatic loading - the best possible compromise between output and wear.

We supply 2-, 3-, 4- and 6-roller mills to suit the required output; the product quality can be varied during operation by altering the classifier speed

All Loesche mills can be started with grinding rollers raised. Metal-to-metal contact between the grinding parts does not occur. Their quiet, ‘smooth’, operation is appreciated.


The great flexibility of Loesche mills:
A 6-roller mill can be operated as a 4-roller mill with a capacity
of around 80 %. A 4-roller mill can be operated as a 2-roller mill
with a capacity of 60%.

Our roller grinding mills are supplied for pressure or suction operation, with internal or external circulation, with rotary or static classifiers as well as with vertical or side raw material feed.

The cost advantages of Loesche roller grinding mills in comparison with other systems of grinding with regard to building expenditure, energy consumption and wear behavior have been verified and published.

MÁY NGHIỀN XI MĂNG LOESCHE

Pioneer and pacemaker in grindingThe patent for the roller grinding mill in 1928 was a milestone for the company and this branch of industry, because based on its design principles, the roller grinding mill possesses an operational flexibility unsurpassed to this day.
Loesche roller grinding mills are applied with great success to the most varied raw materials. These include:
cement raw materials, cement clinker, cement blends, pozzolane, limestone, burnt lime and blast furnace slag,
hard coal, brown coal, lignite, anthracite, petroleum and other coke types,
phosphate, feldspar, talcum, clay, kaolin, bentonite, barite, graphite, colemanite, titanium dioxide, titanium slag, minerals and ores.
Loesche roller grinding mills are the most efficient mills in the world and achieve very high throughputs. They are also extremely maintenance friendly. Service tasks can be carried out quickly. Downtimes are therefore reduced to a minimum.
For grinding and interparticle comminution of minerals and ores Loesche vertical roller mills are also very efficient. Plants can be designed with airswept or overflow mills.
The use of ball media grinding was further developed in 1959 for use in cascade mills. In these mills ferrous and non-ferrous ores are milled; or refuse and sewage sludge combined to produce a homogenous ground product.
The cascade mill finds an equally successful application when drying and grinding chalks in an autogenous process.
As an experienced supplier of process systems - having started with shaft kiln technology - we today concentrate our efforts on further core technologies in the cement industry.

Intro
Dry-grinding plants
Pioneer and pacemaker in grindingFor decades Loesche has successfully claimed the lead in technological development of efficient mills.
Cement raw materialsLoesche roller grinding mills are applied with great success to the most varied raw materials.
Cement clinker and blast furnace slagThe total process is executed in one single machine: Loesche's 2+2 and 3+3 technology.
Rocks, clays, earths, minerals and oresFor the mineral and mining industry we design and build dry-grinding and interparticle comminution plants.
Coal millsFor over 80 years we have been concerned with coal preparation technology.
Hot gas producersWith the hot gas system LOMA heater / multiple lance burner, low-calorific gases are burned very efficiently without a supporting burner.
ClassifiersOur speciality, the Loesche high efficiency classifier, produces products in a homogeneous field of streaming forces in conjunction with centrifugal forces.
Last update: January 22, 2007