vertical shaft lime kiln:
1.under-firing and over-baking 5-8%
2.operate continuously : 48 to 50 weeks
3.ISO9001certification

vertical shaft lime kilnDescription of vertical shaft lime kiln

vertical shaft lime kiln is a kiln used to produce quicklime by the calcinations of limestone (calcium carbonate). The chemical equation for this reaction is:

CaCO3 + heat → CaO + CO2

This reaction takes place at 900°C (at which temperature the partial pressure of CO2 is 1 atmosphere), but a temperature around 1000°C (at which temperature the partial pressure of CO2 is 3.8 atmospheres) is usually used to make the reaction proceed quickly. Excessive temperature is avoided because it produces unreactive, "dead-burned" lime.

Take the300t/d kiln as example.

1.capacity: It can be regulated within 180t/d-300t/d range without influencing quality and consumption targets.

2. Chalk size:  400mm to 80 mm. size range ratio is 1:2

3.Kinds of fuel: natural gas,oil,cola dust,coke oven gas,coal gas of low heat value and mixed fuel of all kinds of fuel(gas and gas,gas and liquid.gas and solid,liquid and solid and so on).

4. Lime products: fine lime and high activity(reaching 360ml,4N HCL Ten minutes). The ratio of lime stone under-firing and over-baking is 5-8%.

5. Low heat wastage: they can make full use of heat energy.when primary air passes.fuel gas is preheated.when secondary air passes.cooled lime is preheated. fuel is burned cmpletely adn fuel heat is made full use of .low heat rate is 800-900kal/kg

6. High work ratio: they can operate continuously for 48 to 50 weeks each year.

7. Calcination way: use our new technolohy, three-way pressure system to reduce lime raw burned and burnt rate and raise lime activety.

1.Composition :The kiln body is rectangular or cylindrical. There are double-deck burner girders in the kiln body with periphery burners in the middle kiln body. Waste gas drawing-out girder is set on the kiln top. The kiln is divided into five parts: material storage zone, preheated zone, calcining zone, posterior calcining zone, cooling zone.

◊storage zone  is between the kiln gas drawing-out device and the crown. it can store adequate lime stone in order not to stop producing when the crown feed device needs short-term maintenance.

◊ preheating zone is between the kiln gas drawing-out device and the upper burner gireder to preheat lime stone.

◊The part between the upper burner girder and the lower girder the calcining zone where lime stone is calcined into fine lime .Its height can be regulated according to requirement of quality or lime stone physical property.

◊posterior calcining zone is between the lower burner girder and lower gas drawing-out girder  . The lime that was calcined will gain the even and refine quality and raise the activity, when through this zone that has the high temperature and no pressure.

◊ cooling zone joins  lower berner and  lime output , cooling air comes into the kiln from the bottom cools lime stone to 75c and comes out of the kiln.Heated secondary air comes into calcining zone to help burn.

2. Central part :Tow-girder burning device is central part of the kiln.Some fuel feed  pipes are placed into the girder, the burner mixes fuel with the combustion air even.the quantity and the are of burners on the level are the same.this makes the kiln section temperature distrbuted even to cut down raw-burner rate and raise lime activety.

3. Gas:Gas extracing girder is on the kiln top. The quantity of pipes is decided by the kiln size.there are many evenly-distributed opens downside of the pipes, kiln gas is extracted by the gas extracing girder through the opens to ensure negative pressure of the kiln section is evenly distributed.

4. dual-pressure system:The small blower blows secondary air.Secondary air comer into the cooling zone to cool line even. This makes the part under the calcining zone keep positive pressure. Dual-pressure system controls the quantity of primary air and secondary air more precisely than all negative pressure sysrem. Waste air of the kiln top is extracted by the run-off regulator device to keep negative in the zones above the calcining zone and make heat temperature on the kiln section.

Technical data of vertical shaft lime kiln

Note: For our company id continuously developing technology, technological parameters can be changed without notice; technical parameters shall prevail to drawing.