• The CHISAKI LIME KILN Burns All Kinds of Lime.

• The High Efficiency Heat Consumption and Stable Operation

• The Best Suited 200 ton/day Production

• The Highest Quality Lime Production

• The lowest Cost of The Operation and maintenance

Movement of solids caused by the action of the rotating hearth combined with the cylindrical pushers makes the flow pattern of solids to be quite uniform. Because of this, exact and low height of the preheating zone is established, making sure the uniform flow pattern of gas stream within it, and resulting in the low pressure drop in spite of small size.

Peripheral movement of solids on the hearth enables the uniform contact of solids with combustion gas stream, and then nearly the ideal heat exchange is carried out between solids and the combustion gas streams.

In short, rotation of the hearth assures the efficient contact between combustion gas and solids streams in the preheating zone.

• Reliable Pushers

As seen in Figure 3, cylindrical pusher extrudes down the solids surrounding it, thus feeding them uniformly onto the lower portion of the kiln. Power consumption of the pusher is small, because of its small contacting surface with the bed of solids.

More than 50% of calcination reaction takes place at the bottom of the preheating zone, where temperature of solids is close to 900℃. Furthermore, the mean temperature of the combustion chamber is as high as 1200℃, and then the radiant heat transfer to the edge of the pusher is very intense, which “sees” the combustion chamber intermittently.  See Figure 3. In spite of such severe circumstance with temperature, trouble free operation of the cylindrical pushers has been confirmed through practical operations longer than 20 years. It should be noted that special cooling system is unnecessary for the pusher.

• Burner Easy to Control, Pollution Free Combustion

Only one or at most two burners are positioned downwards nearly at the center of the circular lid of the kiln. Burning of fuel in the combustion chamber is easy to control through visual or other instrumental measurements. One can use any type of fuel; for instance, fuel gas, kerosene, crude oil, heavy oil, pulverized coal or other combustible materials.

As seen in Figure 1, combustion is carried out in a wide combustion chamber, accompanied by the violent mixing with the air stream, realizing nearly complete combustion. Fuel gas from this type of kiln is thus quite clean, and electrostatic precipitator or even bag filter is usually unnecessary to meet the stringent environmental regulation in Japan.

Flame and combustion gas in the combustion chamber have enormous ability to emit thermal radiation. Sum of the radiant heat transfer to the bed surface of limestone at bottom of the preheating zone, as well as to the upper bed surface of the solids in the main body of the kiln, corresponds to nearly one half of the theoretical energy required for calcination reaction.

• Ejector Assures Uniform Calcination

• Efficient Cooling Zone

• Easy of Operation

Since solids of small size can be processed, necessary residence time of solids in the kiln is far less than in any conventional shaft kilns.

Because of product solids are quickly discharged from the bottom of the CHISAKI LIME KILN, response to the variation of operating conditions can be quickly detected.Therefore, it will be easy to set the high level of operating condition for the required “Quality Control”.Advantages by low ratio of the kiln diameter (D) and height (H), (H/D) is less than 1.5.

1. The low center of gravity because of low height of the equipment, gives lighter support structure and compact foundation.

2. Raw materials of weak mechanical strength such as coral reef and shell can be calcined because of low bed height of kiln.

3. Extremely low dust generation in the kiln, only 2 - 3 kg/CaO.ton

4. Easy to install equipment above the kiln, for example solve following problems by installing large raw material storage bin.

a. Shortage of storage area in the factory
b. Carry-up operation of raw material only at day time because of noise regulation at night
c. Protection of raw material freezing

• Capacity and Heat Consumption

The CHISAKI LIME KILN is designed to process solids of small size, and nearly the ideal heat exchange is achieved between solids and gas streams, making its capacity per unit volume is quite large.In other words, the CHISAKI LIME KILN of given volume can calcine far larger amount of limestone compared with the other types of same volume.

Substantially, counter-current heat exchange is carried out with moving bed contacting principle, resulting in high thermal efficiency even for such production of lime as small as 50 - 100 ton/day.With respect to any types of kilns, usually they say that the larger unit we use, the higher efficiency we get.The CHISAKI LIME KILN challenges to overcome this industrial tradition.

• High Technology Requires A Number of Small Kilns

Along with the recent development of new inorganic substances in advanced technologies, requirement to the quality of calcined lime is getting to be stringent, giving different severe specifications for different purposes.

Conventional large lime kilns cannot satisfy above requirement, because special operation should be made to meet such severe specification, which differs from purpose to purpose. It is predicted that a number of small kilns may replace conventional large lime kilns, in parallel to the development of new inorganic substances with high quality and special functions. The CHISAKI LIME KILN can contribute much in producing lime of high quality with different specifications from purpose to purpose.

• Reformation of Conventional Kiln

In case any conventional shaft kiln becomes old and cannot satisfy the recent requirement for the quality of its product, it can be reformed to the CHISAKI LIME KILN easily, with far less construction cost than constructing new kiln of any conventional type. Foundation support structure, blowers, housing and other else which belong to the existing kiln can be utilized in its reformation to minimize the construction cost.

Several old shaft kilns have had this reformation, and their performance is as good as the CHISAKI LIME KILN of ordinary design. Top half of the old kiln is utilized as the bin of limestone, having bottom half replaced the rotating the CHISAKI LIME KILN, which produces lime of far higher quality than the old one with higher efficiency.