Evotech Pvt. Ltd., Sister Concern of Evcon Technologies, Providers of Evcon Turbo TMT System
Totem Bell-Less Rotary Charging Unit
Advantages
Kalugin Shaftless Hot Stoves for Blast Furnaces (KSS)
1. Flexible control of the radial distribution of material at the blast furnace top
It is achieved due to the fact that material is shifted along the furnace radius by varying the centrifugal force which would affect material as the turning speed of the rotor is being varied. The width of the flow of material, as it is falling from the rotor, is equal approximately to the rotor half radius and quite thin , therefore, as the rotor turning speed is being varied the ore/coke ratio would be also varied in a graduate manner. This would make it possible to optimize ore/coke ratios along the furnace radius thus minimizing the rate of coke.
2. Soft dumping of material on the burden surface
Kalugin Shaftless Hot Stoves for Blast Furnaces (KSS) The charging through BRCU does not destroy the profile of the preceding batch of material, which improves the possibility of prognostication and modeling of the burden layer-wise stacking topography. Besides, the soft charging of material would not result in the formation of excessively compacted volumes of burden, which would otherwise may impede the gas permeability.
3. High rate of circular distribution of burden and averaging of the loaded batch of material
As BRCU is used, material is stacked on the surface of burden in five thin layers at one turn of the rotor. Up to 30-50 layers of burden would be stacked from one batch of material. Owing to the multi-layer charging of material it becomes averaged and circularly distributed in a highly uniform manner. In case of the charging through as chute-type apparatus when circular loading is practiced, only 6-8 layers would be stacked. And in case of a spiral charging , it would be only one layer. Besides, as the chute-type apparatuses are used, there is a problem of having the rings “closed”. As the beginning and end of the ring do not meet, some layers might be not be superimposed adequately, which would result in non-uniform distribution of material.
4. High rate of charging
It is achieved owing to the fact that material is loaded into the furnace with the burden gate being kept fully open. In case of chute-type apparatuses, to achieve circular uniformity the charging is performed the burden gate being partly closed. The outflow time of burden materials in BRCU is 1.5-2. times shorter then that in chute-type apparatuses. Owing to the faster rate of charging, BRCU does not create difficulty to operate the furnace in a “catch-up” mode.
5. Longer service life of the rotor as compared with the chute
Kalugin Shaftless Hot Stoves for Blast Furnaces (KSS)Over the years of operating rotors at the West Siberia Steel Plant and Bhilai Steel Plant in India , none of them happened to fail. It was necessary only to replace the protective plates on the vanes. At BSP the rotor has been in operation for more then 10 years. The protective plates were replaced after 7 years of operation.
6. BRCU central gearbox is simple in design
BRCU central gearbox consists of only one cylindrical gear pair. To distribute material it is only the rotary motion of the rotor which is needed, with a possibility to control its speed. The central gearbox of a chute-type apparatus , which is used for varying the chute inclination angle and rotating the water cooling system, is of a complicated planetary design, in addition, it includes also two worm reducing gears.
7. Long service life of BRCU burden gates
As there is no need to control the falling speed of material on the rotor, practically there is no wear of burden gate wings. In its opened position, BRCU burden gate does not contact with the burden.
8. Less number of mechanisms
In BRCI there are twp burden gates and two gas sealing valves. In a two hopper chute apparatus there are twp burden gates, four gas sealing valves and a flinging chute. On balance, a smaller number of equipments makes the dependability of the whole system better.

Kalugin Shaftless Hot Stoves for Blast Furnaces (KSS)
9. No weighing system
For BRCU there is no need to weigh up the transfer hopper. This makes the design of the charger and the charging process automatic control system simpler, which contributes to the dependability of the apparatus as a whole. In a chute-type apparatus to control the speed of material outflow its is necessary to measure the weight of the transfer hopper.
10. Central flow of material
In BRCU burden travels along one through path, which goes along the central line of the apparatus, without turns in the charging direction from the conveyer (skip) to the rotor. This arrangement is conducive to a uniform distribution of material thanks to the symmetrical loading into the furnace, to a lower wear rate of the equipment.
11. BRCU compact design
By force of the its design features, BRCU is of a lower height , as compared with the chute-type apparatuses. . This makes it possible to install it on the extant blast furnaces to substitute the extant chargers without modifications in basic steel structures at the top and in the upper segment of the skip bridge.
12. Shorter pay-back period (ROI) - not longer than 1 year.
It is achieved due to a reduced rate of coke (by 4 – 6%) and enhance productivity of the blast furnace (by 4-8% and more). TOTEM Co. Ltd. obtained data from the field that corroborated improvements in the operating indices in four steel plants in India and Russia This information has been published at large and their trustworthiness would not evoke any doubts. So, BRCU makes it possible to reduce substantially the production cost of hot metal even in the period of crises, which would make the way out of it easier.
13. BRCU environment friendliness
The BRCU implied reduction in coke rate is achieved owing to a better utilization of the reducibility of gases, not by substituting one type of fuel with another, i.e. by a more beneficial method. Therefore, effluents of gas into the ambient air , CO2 inclusive, will be curtailed in proportion to the reduction in coke rate. Such an ecology index is the topic of to-day ("Kyot Protocol") and CO2 effluents are expected to be put under rigid control soon in many states. Thanks to a reduced rate of coke in iron making the hazardous effluents in coke making production will be also reduced.
14. BRCU installation project is characterized by a comparatively low cost and longer service life of the equipment
Thanks to that, BRCU installation project will pay for itself by a sheer replacement of morally obsolete equipment with a new, advanced equipment, nothing to say about reduced coke rate and enhanced productivity of the furnace implementation of this project can be funded as a scheduled maintenance work.
15. BRCU project is a technicaly intensive affair
It includes an original automatic control system and mathematical models, which apart from other economic benefits, will give rise to a better culture of production work.

To illustrate the efficiency of the rotary charging unit, we are giving the operating indices of the blast furnaces with rotary distribution of burden and chute-type distribution obtained from Bhilai Steel Plant (BSP) in India. Also the performance data of blast furnace No2 at JSPL (Jindal Group) with BRCU, as compared with the performance data of blast furnace “G” at Tata Steel with Paul Wurth apparatus. I'd like to draw your attention to an innovative equipment, developed by the engineers of our Company - a rotary charging unit, designed for blast furnaces of various volumes. (RCU). When installed, this Unit improves substantially the production and economic indices of iron making. Thanks to RCU, such benefits can be provided as a high degree of uniformity in circumferential distribution of stock, flexible and efficient control over the distribution of burden along the top radius.