Cement Rotary Kiln Lime Rotary Kiln
1. Basic introduction to rotary kiln for active lime production
Lime rotary kiln alias drum rotary kiln, advanced structure, lime rotary kiln reliable rotary kiln with combined scale seal at both ends. Make the air leakage coefficient less than 10% using composite refractory materials to reduce radiation heat loss.
Taking a 750T/D production line as an example, it can save 5198 tons of standard coal/year, 1.24 million kWh/year of electrical energy and 150,000 tons/year of waste material. At the same time active lime can be used in steel making to reduce consumption and shorten smelting time, saving 41 million kWh per year for steel making and 25 million kWh per year for alumina and other industries.
A single production line with a daily capacity of 750 tonnes saves 5,198 tonnes of standard coal and 1.24 million kWh of electricity per year. The 1,000 tonne per day active lime technology can reduce overall system energy consumption by 12-15%. The equipment is widely used in the steel, magnesium metal, calcium carbide, alumina and paper industries.
2. Rotary kiln technology for active lime production
The active lime production line is mainly composed of three main engines: vertical preheater, rotary kiln, vertical cooler and exhaust gas treatment system, coal powder preparation system.
The crushed limestone is stored in the silo and transported to the top bin of the preheater by the conveying system. Preheater top bin, by the upper and lower 2 material level meter to control the amount of material, and then through the lower material tube will be uniform distribution of limestone to the preheater chamber.
The limestone is heated in the preheater by the high temperature flue gas at the end of the kiln and then pushed into the rotary kiln by a hydraulic pusher. The limestone is calcined at a high temperature in the rotary kiln and the burnt active limestone enters the vertical cooler where it is cooled by the cold air drummed into the cooler and discharged. The pre-heated secondary air enters the kiln and the exhaust gas is discharged through the exhaust gas treatment at the end of the kiln.
3. Technical characteristics of rotary kiln for active lime production
(1) Advanced structure, low pressure loss vertical preheater can effectively improve the preheating effect, the preheated limestone into the kiln decomposition rate of up to 20 ~ 25%, and can use 10 ~ 50mm of fine-grained limestone.
(2) Reliable combined scale seals at both ends of the rotary kiln, so that the air leakage coefficient is less than 10%, and the use of composite refractory lining to reduce radiation heat loss.
(3) Filled, zone-ventilated round or square vertical coolers, so that the limestone temperature out of the cooler is: 80°C + ambient temperature for easy conveying and storage, and to preheat the secondary air into the kiln to over 700°C, reducing moving parts and special materials.
Translated with www.DeepL.com/Translator (free version)
Cement rotary kiln product parameters
| NO. | Specification (m) | drawing Number | Basic Parameter | Main Decelerator | Main Motor | Block Type | Support Bearing | Weight(t) | Remark |
| | | | Rotating Speed (r/min) | Slope (％) | Capacity( t/d) | Model | Speed Ratio(i) | Model | Power(KW) | Rotating Speed (r/min) | | | | |
| 1 | Φ2.5×78 | J919 | 0.49～1.47 | 3.5 | 70～96 | PT800(3) | 61.88 | | 100 | | Hydraulic | | 327.5 | Treatment of paper sludge |
| 2 | Φ3.2/3.4×60 | J935 | 0.67～2.0 | 3 | 400 | PT800(3) | 55.09 | | 100 | | Hydraulic | Scroll | 340.31 | Active Lime |
| 3 | Φ3.5×115 | 928 | 0.46～1.38 | 3.5 | 450 | PT800(3) | 61.88 | | 75×2 | | Hydraulic | | 776.81 | Treatment of paper sludge |
| 4 | Φ3.6/3.8×70 | J939 | 0.4～2.0 | 3 | 600～660 | BST-1790 | 46.146 | | 160 | | Hydraulic | Scroll | 480.4 | Active Lime Dolomite |
| 5 | Φ4.2×50 | J940A | 0.33～1.8 | 3 | 600～660 | PT900(3) | 56.43 | | 160 | | Hydraulic | Scroll | 521.3 | Active Lime |
| 6 | Φ4.2×50 | J944 | 0.2～1.8 | 3 | 600～660 | PT900(3) | 56.43 | | 160 | | Hydraulic | Slide | 579 | Active Lime |
| 7 | Φ3×46 | J922A | 0.45～1.8 | 3 | 200～220 | ZSY450-63 | 63 | SZN4-225-21 | 55 | 1000 | Mechanical | Slide | 201.8 | Active Lime |
| 8 | Φ3.5×54 | J969A | 0.6～1.8 | 3.5 | 300～350 | ZSY560-56 | 56 | YP355S-8 | 132 | 750 | Hydraulic | Slide | 340.7 | Active Lime |
| 9 | Φ4.3×64 | | 0.194～1.94 | 3.5 | 800 | ZSY630-71 | 71 | YZP355L-6 | 250 | 980 | Hydraulic | Slide | 557.5 | Active Lime |
| 10 | Φ4.9×69.5 | | 0.179～1.79 | 3.5 | 1000 | ZSY710-63 | 63 | ZSN4-355-092 | 315 | 1000 | Hydraulic | Slide | 750 | Active Lime |
Cement rotary kiln photo explanation
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