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 Pyro Section |
 Reinforced Suspention preheater |
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The RSP facilities firing of fuel (upto 60% of total requirement ) before kiln, to achieve calcinations degree upto 95% and thus helps in increasing capacity of the total system substantially, without increasing heat load on the kiln.
The RSP system mainly consists of the Swirl burner (SB), Swirl Calciner (SC), Mixing Chamber (MC) and Adjustable Orifice (AO).
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| Swirl Burner (SB) |
Fuel is introduced vertically in the burner and primary air from the cooler enters tangentially. This part of the calciner helps in providing stable burning of fuel, with relatively high air/fuel ratio. |
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| Swirl Calciner (SC) |
The oxygen rich hot air tapped from cooler, enters tangentially in this furnace. Material from second stage (from bottom) cyclone is fed at the feed points as shown. The swirling action provides longer retention time and achieves complete combustion of fuel at nearly stoichiometric fuel / air ratio. The presence of oxygen rich air helps in rapid combustion of fuel. These conditions help in rapid calcinations of the raw meal fed to the calciner. |
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| Mixing Chamber (MC) |
A duct (CD) connects the SC to MC. The hot gas from kiln gets mixed with the hot gases with material coming from SC, in the MC. The material gets lifted and enters the bottom stage cyclone. The MC provides further retention time and helps in accelerating the calcination upto 95% before the material gets separated in the bottom stage cyclone and is fed to the kiln. |
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| Adjustable Orifice (AO) |
This device installed at kiln inlet before MC helps in adjusting velocity of the air entering MC and balances quantity of the air passing through kiln and that passing through the duct taking air from cooler to SC. |
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| Following are the advantages of RSP System
- Smaller kiln size for the same capacity, or higher output from the same kiln size. (Doubling of the capacity is normal).
- Lower heat consumption.
- Use of low grade, high ash coal at relatively coarse particle size is feasible
- Non conventional fuels can be used in the calciner efficiently.
- No coating formation in the SC & MC since the decarbonation is achieved at a temperature below 1000°C.
- Combustion in presence of oxygen rich air in SC ensures complete combustion at nearly stoichiometric fuel air ratio, which is the main criterion for stable operation.
- Low pressure preheater cyclones help in lowering the pressure drop at preheater fan inlet and thus saving in power consumption.
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| The six stage preheater helps in achieving better heat consumption. |
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| Rotary Kilns |
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SPM rotary kilns are mainly known for their constructional strength. Those parts which are subjected to high mechanical stresses such as kiln shell, tyres, supporting rollers bearings kiln drive are designed to withstand the most hostile conditions and are constantly being modified and kept technically upto date.
Rotary Kiln & Pre-heater tower : The kiln shell is fabricated from IS-2062 Tested plates. The unit consists of tyre rings, Girth gear, Gear guard, Inlet and outlet seal, supporting Roller assembly feed & discharge hood etc.
Tyres are made either in the form of a loose ring or they are fixed to the kiln shell in a toothed form. The toothed tyre attachment reduces the deformation of the kiln shell, and therefore also that of the refractory lining, to a minimum. Kilns with toothed tyres have particularly low lining wear. The bearings for supporting the roller are compact and robust in design and are interchangeable. Cooling is achieved by water circulation. |
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| The specific features of SPM kilns are |
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- Most efficient pneumatic inlet seal.
- Modern graphite block outlet seal.
- Hydraulic thruster for adjusting the kiln position.
- Modern three channel coal burner for efficient combustion of coal.
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| Reciprocating Grate Coolers |
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SPM has completely indigenized the grate coolers design. SPM has supplied grate coolers for various plants which are working satisfactorily. In its effort to modernize, SPM is in touch with the recent trends in grate cooler design and has already taken steps to bring the modern features, so the
recuperation efficiency is improved, total cooling air requirement is reduced and as a result, total specific power consumption for the cooler is reduced.
SPM also offers planetary coolers which are simple in design, do not require separate dedusting, drive and also make the total system compact.
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Drying chamber can be provided before first chamber. The grinding length of the mill can be suitably divided in two chambers by a control diaphragm which allows fines toriove to the second chamber and large particles get further ground in the first chamber. The grinding media grading can thus be
optimized to suit the particle size. Lifting liners are provided in the first chamber. Classifying liners are provided in the second chamber.
This mill can be used in open circuit without separator with larger L/D ratios. |
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Cement Division
