Lime Shaft Kiln
Vertical Energy-Saving Limestone Calcination Kiln for High-Activity Quicklime Production
Lime Shaft Kiln (Vertical Lime Kiln) is professional vertical static calcination equipment specially designed for limestone processing. Different from rotary lime kilns, it adopts vertical gravity feeding and three-zone thermal cycling structure, featuring small footprint, low investment and low fuel consumption. It stably calcines limestone into high-activity quicklime at 900-1150℃, widely used in construction, metallurgy, chemical industry and environmental protection desulfurization fields.
High Activity
Uniform Calcination
Stable Quality
What is Lime Shaft Kiln?
Quicklime production is dominated by two mainstream equipment: rotary kiln and shaft kiln. Although rotary lime kilns have large output, they require huge capital investment, large workshop space and high operating costs, which are not suitable for medium and small-scale lime projects. Traditional old-fashioned shaft kilns suffer from uneven temperature, insufficient calcination, low lime activity, serious dust pollution and high energy consumption, resulting in unstable product quality and low economic benefits.
Our Energy-Saving Lime Shaft Kiln adopts upgraded vertical three-zone integrated calcination technology, including preheating zone, constant-temperature calcination zone and cooling zone. It realizes full countercurrent heat exchange and automatic continuous production. With dual fuel adaptability (coal/gas), precise temperature control and fully enclosed environmental protection design, it solves the defects of traditional shaft kilns, achieving uniform calcination, high lime activity, low energy consumption and zero dust pollution, becoming the preferred equipment for medium and high-quality quicklime mass production.
Core Structural Composition & Functional Advantages of Lime Shaft Kiln
1. Vertical Integrated High-Strength Kiln Body
The overall vertical cylindrical structure occupies ultra-small floor space, only 1/3 of the land area of rotary kilns with the same output. The kiln body is welded with thickened high-strength steel plates and lined with multi-layer high-temperature refractory materials. It features strong structural stability, high temperature resistance and long service life, supporting 24-hour continuous stable operation without deformation.
2. Three-Zone Zoned Thermal Insulation Structure
Scientific preheating, calcination and cooling zoning design realizes independent temperature adjustment and cyclic heat exchange. The internal temperature field is uniform without dead angles, completely avoiding raw lime, over-burning and uneven calcination problems of traditional kilns. Each batch of finished quicklime has consistent activity and stable quality.
3. Coal & Gas Dual-Fuel Flexible Combustion System
The upgraded combustion system supports multiple fuels such as clean coal powder, natural gas, blast furnace gas and converter gas. It can switch fuel modes freely according to local fuel conditions. The uniform micro-flame combustion mode ensures full fuel combustion, improves thermal utilization rate and effectively reduces unit production cost.
4. Intelligent Constant-Temperature Control System
Equipped with full-range temperature sensors and automatic PLC control system, the core calcination temperature is stably locked at 900-1150℃ with precise temperature difference control. It automatically adjusts feeding volume, air intake and combustion capacity according to raw material particle size and output, ensuring optimal limestone decomposition state and high lime activity.
5. Closed Waste Heat Recycling & Energy Saving System
It adopts internal cyclic waste heat recovery technology. The cold air for cooling finished lime is heated and reused for combustion supporting, and flue gas waste heat is used for raw material preheating. The comprehensive energy-saving rate is up to 30%, which is far more energy-efficient than traditional vertical kilns, greatly reducing long-term fuel consumption.
6. Fully Enclosed Dust Removal & Environmental Protection Structure
Top sealed feeding and bottom fully enclosed discharging structure prevents dust overflow. Matched with professional pulse dust removal and flue gas purification equipment, it realizes standard flue gas emission and dust-free production. It fully meets international environmental protection standards and solves the pollution pain point of traditional lime kilns.
7. Automatic Feeding & Discharging System
Equipped with intelligent automatic batching feeding machine and sealed disc discharging device. The whole process from feeding, calcination to discharging is automated with low manual intervention. It reduces labor costs, realizes continuous and uninterrupted production, and greatly improves production efficiency.
Core Product Advantages of Lime Shaft Kiln
1. Low Investment & Small Floor Space
Compared with rotary lime kilns, the vertical shaft kiln has simpler structure, lower equipment and civil engineering investment, and smaller site occupation. It is very suitable for small and medium-sized lime factories with limited plant area and budget, with short construction cycle and quick return on investment.
2. Uniform Calcination & High Quicklime Activity
Three-zone balanced temperature field and sufficient heat exchange ensure complete decomposition of limestone. The produced quicklime features uniform particle size, low over-burning and under-burning rate, high activity (280-340ml), strong reactivity and stable industrial application performance, meeting high-standard industrial lime demands.
3. Dual-Fuel Adaptability & Low Operating Cost
Flexible switching of gas and coal fuel modes adapts to different regional energy structures. The high-efficiency waste heat recycling system reduces comprehensive energy consumption by 25-30%. With low failure rate and simple daily maintenance, the long-term operating cost is far lower than that of rotary kilns.
4. High Automation & Stable Continuous Production
Full PLC intelligent control realizes automatic temperature adjustment, feeding and discharging. The production process is stable and controllable without manual intervention errors. The equipment can operate continuously for a long time with stable daily output and consistent batch quality.
5. Eco-Friendly & Standard Emission
Full sealed production and complete flue gas dust removal system eliminate dust and exhaust gas pollution. It meets global industrial environmental protection emission standards, realizing green and environmentally friendly lime production, and helping enterprises pass environmental assessment smoothly.
6. Wide Raw Material Adaptability
It is suitable for limestone with particle size of 30-80mm, covering most common limestone raw materials. It supports flexible adjustment of output and parameters according to raw material characteristics, with strong production adaptability and high resource utilization rate.
Working Principle & Complete Calcination Process of Lime Shaft Kiln
Core Working Principle
The Lime Shaft Kiln adopts vertical gravity countercurrent heat exchange calcination principle. Limestone materials are evenly fed from the top of the kiln, and slowly descend by gravity. Hot flue gas rises upward in reverse with materials to form a stable and uniform temperature field. Materials pass through three independent thermal zones in sequence to complete the entire lime calcination reaction.
Preheating Zone: High-temperature flue gas preheats and dries raw limestone to remove surface and internal moisture, improving subsequent calcination efficiency. Calcination Zone: Constant temperature maintained at 900-1150℃, limestone undergoes complete thermal decomposition reaction to generate high-activity quicklime. Cooling Zone: Cold air is blown in from the bottom to cool finished lime, and the heated cold air re-enters the calcination zone for combustion supporting, realizing waste heat recycling and energy saving.
Standard Lime Production Flow
Limestone Raw Material Crushing & Screening → Proportioning & Feeding → Top Kiln Preheating → Vertical Shaft Kiln Constant-Temperature Calcination → Bottom Air Cooling → Automatic Discharging → Finished Quicklime Screening & Storage
Application Scenarios of Lime Shaft Kiln
Main Application Fields
Lime Shaft Kiln is the core equipment for medium and small-scale high-quality quicklime production. The produced high-activity quicklime is widely used in building concrete, mortar raw materials, metallurgical steelmaking desulfurization and dephosphorization, chemical calcium salt processing, industrial wastewater treatment, road foundation stabilization and environmental protection flue gas desulfurization projects. It is the preferred equipment for civilian and industrial grade lime production.
Classic Matching Production Line
Limestone Crushing & Screening → Automatic Batching & Feeding → Vertical Shaft Kiln Preheating & Calcination → Air Cooling & Discharging → Finished Lime Fine Screening → Dust Removal & Purification → Automatic Packaging & Storage
FAQs of Lime Shaft Kiln
Q1: What is a lime shaft kiln used for?
A: Lime shaft kiln is vertical professional calcination equipment for limestone. It calcines natural limestone into high-activity quicklime through high-temperature decomposition, widely used in building materials, metallurgy, chemical industry, environmental protection desulfurization and water treatment fields.
Q2: What is the difference between shaft kiln and rotary kiln for lime production?
A: Lime shaft kiln has low investment, small floor space and low energy consumption, suitable for 50-500TPD medium and small-scale projects; rotary lime kiln has larger output and higher automation, suitable for large-scale super-large lime production lines. Shaft kilns have higher cost performance for small and medium projects.
Q3: What is the calcination temperature of lime shaft kiln?
A: The standard calcination temperature is 900-1150℃. Through three-zone staged temperature control, limestone is fully decomposed to ensure high activity and low impurity of finished quicklime, avoiding under-burning and over-burning quality problems.
Q4: What fuel does the lime shaft kiln support?
A: It supports multiple fuel options including natural gas, coal powder, blast furnace gas and biomass fuel. Customers can choose freely according to local fuel conditions to minimize production costs.
Q5: What is the activity of finished lime from shaft kiln?
A: Our upgraded lime shaft kiln can produce high-activity quicklime with activity of 280-340ml, which meets national and international industrial high-standard lime requirements, far superior to traditional old-fashioned shaft kiln products.
Lime Shaft Kiln Of Real Project Cases
Case 1: Medium-Sized Industrial Lime Production Project | Indonesia Building Material Plant
Project Info: The customer needed cost-effective high-activity quicklime for local construction and metallurgical industries. Our Φ3.0×12m lime shaft kiln was adopted. With dual-fuel gas combustion and intelligent constant temperature control, the lime activity reaches 320ml, and the product qualification rate is over 98%. The energy-saving design reduces fuel cost by 28%, realizing low-cost and stable mass production of industrial lime.
Case 2: Environmental Protection Desulfurization Lime Project | Malaysia Power Plant Supporting Project
Project Info: The power plant needs stable supply of high-activity quicklime for flue gas desulfurization. Our fully enclosed environmental protection lime shaft kiln solves the dust pollution problem of traditional kilns. The three-zone uniform calcination technology ensures high and stable lime activity, which perfectly meets the strict desulfurization efficiency requirements of power plants. The equipment runs stably all year round with low maintenance cost.
Case 3: Small-Scale Low-Investment Lime Plant | Cambodia Local Construction Project
Project Info: The customer has limited plant area and project budget, suitable for small and medium output lime production. Our Φ2.5×10m mini lime shaft kiln features small floor space, fast installation and low investment. The automatic operation reduces labor input, and the finished lime fully meets local construction material standards, with quick project payback and significant economic benefits.
Technical Parameters of Lime Shaft Kiln
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Item
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Specification
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Machine Model
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Φ2.5×10 / Φ3.0×12 / Φ3.5×14m Customizable
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Daily Production Capacity
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50 – 500 TPD High-Activity Quicklime
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Calcination Temperature Range
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Preheating: 200-600℃; Calcination: 900-1150℃; Cooling: 100-300℃
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Applicable Raw Material
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Natural Limestone, Particle Size: 30-80mm
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Applicable Fuel
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Natural Gas, Coal Powder, Blast Furnace Gas, Biomass Fuel
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Quicklime Activity
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280 – 340ml (High activity industrial grade)
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Qualified Rate of Finished Products
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≥98% Low under-burning & over-burning rate
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Comprehensive Energy Saving Rate
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25% – 30% Higher than traditional vertical kilns
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Thermal Efficiency
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≥88% Waste heat cyclic utilization
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Operation Mode
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24h Continuous automatic production
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Core Function
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Limestone preheating, high-temperature calcination, quicklime cooling and shaping
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Applicable Industry
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Construction building materials, metallurgical desulfurization, chemical industry, water treatment, road engineering
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Core Features
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Low investment, energy-saving, small footprint, high lime activity, dual-fuel optional, environmental protection
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Get Custom Lime Shaft Kiln Solution
Our Lime Shaft Kiln adopts upgraded three-zone cyclic calcination and dual-fuel energy-saving technology, specially optimized for medium and small-scale quicklime production. With core advantages of low investment, small floor space, high lime activity, low energy consumption and environmentally friendly production, it provides cost-effective and stable core equipment support for global small and medium lime manufacturing projects.
Contact us now for free process design, model selection and accurate turnkey quotation!
