The Jet Technologies Concern supplies shaft furnaces that allow to solve any tasks relating to the production of metallurgical lime, construction lime and magnesia binders.
A wide range of our solutions allows in the shortest possible time to find the optimal solution for your business in every price category.
Shaft Furnaces of the KST Line
- Low-cost solutions for producing high quality metallurgical lime
- High efficiency
- The quality of the product produced is comparable to that produced in parallel/counter flow regenerative furnaces
The KST line includes four types of shaft furnaces for manufacturing of products of various grades:
- KST ML - soft firing of middle-sized limestone and dolomite
- KST MF - soft firing of fine grain limestone and dolomite
- KST B - high temperature firing of carbonate rocks
- KST S - agglomeration and sintering
Shaft furnaces of the KST brand can burn materials from 20 to 160 mm in size and at temperatures from 800 to 2200 ° C.
A particular advantage of the KST line shaft furnaces is the compatibility of shaft shapes and types of loading and unloading mechanisms with those in furnaces of early domestic manufacture, built in different years by the standard projects of Giprostrom and Rosstromproekt. Such furnaces can be upgraded to KST furnaces with minimal capital costs. As a result of such reconstruction the firing fuel rate is reduced on the average by 15-20%.
Such broad performance capabilities of KST furnaces are possible due to the structural characteristics of the shafts, advanced devices of injection and combustion of fuel, strict height setting of these devices, radius and generating line of the oven. Positioning of the devices of injection and combustion of fuel ensures the optimal temperature distribution throughout the height of the shaft and even heating of the material in all sections of the furnace.
The devices of injection and combustion of fuel in KST furnaces are installed with burners projecting into the layer of rock. They feature a unique system of thermal protection and self-cooling, ensuring long-term durability of the burners in the layer of rock at temperatures up to 1350 ° C. For use in ultra-high temperatures, up to 2200 ° C, a forced cooling system of fuel devices using a high-temperature coolant in a closed loop has been developed. Due to an efficient system of heat recovery the heat is not consumed by the cooling agent, but returns to the furnace in full with hot air.
Due to simple shapes and straight section of KST furnaces they can be lined with refractories from serial deliveries, which ensures low cost of lining and a wide range of suppliers of refractories. Refractories for the working layer of lining are selected based on the required furnace temperatures, chemical composition and properties of fired material, so the furnace lining preserves its durability and does not require replacement for many years.
MF and FTC S are specially designed for firing fine grain materials generated at the stages of enrichment and reduction of raw materials. These furnaces are equipped with powerful forced-draft equipment which pumps the air into the layer of rock at the pressure up to 40 kPa, which enables the shaft to soft burn limestone and dolomite with the grain size from 20 mm, as well as to agglomerate various materials at high temperatures with the grain size from 10 mm.
The agglomeration technology of shaft firing has significant advantages over the other technologies. It is distinguished by the lowest fuel, capital and operating costs if compared, for example, with sintering technology in the rotary kiln. Our technology allows to arrange the production of agglomerated magnesite, spinel and sintering of bauxites in KST furnaces.
Shaft Furnaces of the JTR Line
JTR furnaces are parallel/counter flow regenerative furnaces with a system of pulse firing. They have two round or rectangular shafts with common systems of gas and air supply, smoke removal and gas purification.
In comparison with typical double-shaft regenerative furnaces, the proposed solution has significant advantages due to the use of modern gas-dynamic schemes and pulse heating:
- Electricity consumption is reduced by 30-40% (relative to the classic regenerative double-shaft furnaces)
- The cost of lining is reduced by 20-30% due to the absence of complex lining structures from precast shapes
- No need for periodic repair and replacement of peak burners
- Possibility to repair the shafts without interrupting lime production
- The costs of flues cleaning are substantially reduced
Parallel/counter flow double-shaft furnaces for limestone firing are designed for soft firing of limestone to produce high-quality quick-slaking metallurgical lime, construction lime and, similar to the KST furnaces, allow sintering of rock. These furnaces are heated with natural gas.
The JTR line includes four types of shaft furnaces for manufacturing of products of various grades:
- JTR ML - soft firing of middle-sized limestone and dolomite
- JTR MF - soft firing of fine grain limestone and dolomite
- JTR B - high temperature firing of carbonate rocks
- JTR S - agglomeration and sintering
The key feature of the technology of limestone firing in JTR furnaces is the creation of two streams of gaseous heat carrier directed vertically in opposite directions along the firing stroke. This creates in the furnace chamber a uniform stream of burning fuel, going in all directions. The main gas flow in the firing zone moves in the uniflow with the material down to the bottom collector, from which it is forcibly pumped out and directed to the adjacent shaft. Consumptions of all gas mediums are time-varying, which ensures the pulse mode of heating, firing and cooling. Cooling air is injected in the bottom part of each shaft. The pulsations in the two shafts are carried out in antiphase. The pulse mode of heating of limestone granules ensures an effective use of the heat of combustion products without overheating the surface of the granules.
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