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Help CenterIndustrial Two-Stage Sealing Valve | High Air-Tightness Discharge Valve for Lime Vertical Kiln
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Item |
Technical Specification |
Remarks |
|---|---|---|
Applicable Kiln Type |
Active Lime Vertical Kiln / Shaft Kiln |
Matching 100-800TPD lime production line |
Working Temperature |
≤800℃ |
Long-term stable high-temperature operation |
Working Pressure |
±5000Pa |
Adapt to positive/negative pressure kiln environment |
Discharging Capacity |
5-30t/h |
Customizable according to production demand |
Air Leakage Rate |
≤1% |
Ultra-low air leakage, energy-saving |
Driving Mode |
Electric Servo Drive / Pneumatic Drive |
Optional dual driving modes |
Switching Cycle |
3-10s |
Adjustable switching frequency |
Main Material |
Wear-resistant Cast Steel + Heat-resistant Alloy |
Valve plate and sealing surface reinforced |
Operation Mode |
Automatic PLC Interlocking Control |
Unattended intelligent operation |
Service Life |
≥3 years |
Under normal working conditions |
Installation Method |
Vertical Flange Connection |
Convenient for disassembly and maintenance |
Product Overview
The two-stage valve is a core sealing and discharging equipment specially designed for vertical lime kiln calcination systems. It solves the key industry pain point of air leakage and heat loss during the ash discharging process of lime vertical kilns. Adopting a dual-valve sequential switching structure, the equipment realizes intermittent feeding and continuous sealed discharging, effectively isolating the internal high-temperature calcination atmosphere from the external environment. It ensures stable internal air pressure and uninterrupted combustion-supporting air supply inside the kiln, which guarantees continuous and efficient lime calcination production, improves finished lime quality, and reduces energy consumption. Widely applicable to active lime vertical kilns, shaft kiln calcination production lines and other metallurgical and building material industrial kiln systems.
Core Features & Advantages
1. Excellent Air-Tight Sealing Performance
Different from single-layer discharge valves, the two-stage staggered opening and closing structure completely avoids direct air convection between the kiln interior and the outside. It maintains stable negative/positive pressure inside the vertical kiln, prevents hot air overflow and cold air infiltration, ensures sufficient combustion of fuel, and effectively reduces kiln body heat loss by 15%-20%, greatly improving thermal utilization efficiency.
The dual-valve group works in a circulating alternate switching mode. While one valve completes material discharging, the other keeps sealed and closed, realizing non-stop sealed ash discharge without affecting the continuous operation of the lime kiln. It matches the working rhythm of disc ash unloaders and other supporting equipment, ensuring uniform and stable discharge of finished lime, avoiding material blockage and intermittent production shutdowns, and improving overall production efficiency.
Key contact parts are made of high-strength heat-resistant alloy and wear-resistant cast steel materials, which can adapt to the long-term high-temperature working environment of lime kilns (300-800℃). The valve plate and sealing surface adopt precision processing technology, with strong anti-abrasion and anti-deformation capabilities, resisting material impact and high-temperature oxidation, extending the service life of the equipment and reducing frequent replacement costs.
Equipped with a mature electric servo drive system, the valve opening and closing actions are precise, sensitive and stable, with accurate switching time control. The whole machine has a simple and compact mechanical structure, fewer vulnerable parts, low operation noise and low failure rate. It supports automatic intelligent control linkage with the lime kiln production line, realizing unattended automatic discharging and reducing manual operation costs.
The standardized integrated structural design is convenient for on-site installation, transformation and docking with new or old vertical kiln equipment. The detachable structural design of key components facilitates daily inspection, cleaning and maintenance. No complex debugging is required after installation, with low later maintenance cost and high equipment operation stability.
The two-stage valve adopts an upper and lower dual-valve layered layout. During the operation process, the upper valve opens first to receive the lime material, then closes tightly after material feeding is completed. Subsequently, the lower valve opens to discharge the material. Through this sequential alternate opening and closing logic, the equipment always keeps one valve in a closed sealing state during the whole discharging process. It thoroughly isolates the internal and external air flow of the kiln, achieves zero air leakage during material discharging, and ensures the stable operation of the high-temperature calcination environment inside the vertical lime kiln.
This two-stage sealing valve is specially customized for vertical lime kiln production lines, and is widely used in active lime production, metallurgical auxiliary material calcination, building material lime processing, chemical calcium oxide production and other industries. It is compatible with various specifications of vertical shaft kilns, and can be perfectly matched with disc ash unloaders, belt conveyors and other supporting equipment to form a fully sealed and continuous lime discharging system.
By optimizing the sealing and discharging process of the lime vertical kiln, our two-stage valve effectively stabilizes the calcination temperature and air pressure in the kiln, reduces fuel consumption and production failure rate, improves the whiteness and activity of finished lime, and enhances product market competitiveness. It is an essential energy-saving, efficient and stable core auxiliary equipment for modern automated lime vertical kiln production lines.
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