Light gray kiln (self-alkali steam calcination kiln)
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  • Light gray kiln (self-alkali steam calcination kiln)

The light soda ash kiln (self-recarbonation steam calcination kiln) is the core equipment for soda ash (sodium carbonate) production. It adopts the advanced "self-recarbonation" process, achieving high-temperature decomposition of sodium bicarbonate (heavy soda ash) and continuous production of light sodium carbonate (light ash) through indirect steam heating. The equipment integrates mechanical transmission, thermal energy utilization, and material circulation technologies, featuring high efficiency, low consumption, environmental protection, and stability. It is suitable for the calcination process in soda ash production by the combined soda process or ammonia-soda process.

Product Applications

1. Soda Ash Production Industry: Used as key production equipment for high-temperature decomposition of heavy soda ash to produce light soda ash.

2. Glass Manufacturing: Supplies high-quality light soda ash for the production of float glass, container glass, etc.

3. Chemical Industry: Provides raw alkali for industries such as alumina and sodium silicate.

4. Detergents and Daily Chemicals: Used in the production of synthetic detergents, sodium silicate, and other daily chemical products.

5. Food Processing: Produces food-grade soda ash used in flour, fermentation, and other processes.

Product Features

1. Self-Recarbonation Technology: Innovative design of the recarbonation device automatically recovers and returns alkaline substances (such as sodium carbonate dust) generated during decomposition back into the kiln, reducing raw material loss. Recarbonation rate ≥98%, reducing raw material consumption by 3-5%.

2. Indirect Steam Heating: Uses high-temperature steam (3.82-5.3MPa, 400-450°C) to heat the kiln chamber through coils, avoiding pollution caused by direct combustion and improving thermal efficiency by over 15%.

3. Low Energy Consumption Design: Optimizes kiln chamber structure and insulation layer (using alumina silicate fiber modules + lightweight bricks) to reduce heat loss, lowering comprehensive energy consumption to ≤1.2 GJ/t soda ash.

4. Continuous Production: Achieves full-process automation control of feeding, calcination, and discharging, with stable processing capacity and continuous operation time ≥7200 hours/year.

5. Environmental Performance: Equipped with flue gas dust removal, desulfurization, and denitrification systems, with emission indicators better than national standards (dust <10mg/Nm³, NOx <100mg/Nm³).

6. High Reliability: Key components (such as transmission system and sealing devices) use imported brands, with a failure rate <1%.

Product Functions

1. Material Conveying: Screw feeder uniformly feeds heavy soda ash (moisture content ≤2%) into the kiln chamber.

2. High-Temperature Decomposition: Kiln chamber temperature is 950-1050°C, decomposing heavy soda ash into light soda ash, carbon dioxide, and steam.

3. Recarbonation Recovery: Alkali dust is recovered through a cyclone separator and bag filter, then returned to the kiln head for reuse via a scraper conveyor.

4. Steam Generation: Hot gases generated by decomposition pass through a waste heat boiler to produce medium-pressure steam (1.27-1.5MPa, 250-300°C) for workshop use.

5. Product Cooling: Light ash is transported by a chain plate conveyor to a cooler, indirectly cooled with water to ≤100°C to prevent caking.

6. Automatic Control: PLC system monitors temperature, pressure, speed, and other parameters in real time, supporting remote operation and fault alarms.

Product Technical Parameters

Parameter Category

Technical Specifications

Processing Capacity

15-30 t/h (customizable according to demand)

Kiln Chamber Diameter

Φ3200-Φ4500mm

Kiln Chamber Length

25-40m

Kiln Body Rotation Speed

0.8-2.5 rpm (variable frequency adjustable)

Operating Temperature

Kiln Chamber: 950-1050°C; Recarbonation Zone: 600-800°C

Operating Pressure

Slight positive pressure (50-100Pa)

Steam Parameters

Heating Steam: 3.82-5.3MPa, 400-450°C; Steam Generation: 1.27-1.5MPa, 250-300°C (steam output ≈0.8t/t soda ash)

Motor Power

Main Drive: 75-160kW; Auxiliary Drive: 15-30kW

Equipment Weight

Approximately 200-400t (including support frame and transmission system)

Dimensions

Length × Width × Height: approximately 45-60m × 8m × 8m (including auxiliary equipment)

Material

Kiln Body: SA213T12 alloy steel + refractory lining; Recarbonation Device: 316L stainless steel; Seals: silicon carbide + packing seal

Note: The above parameters are designed based on the heavy soda ash decomposition process. Specific configurations can be customized and optimized according to user capacity, raw material characteristics, and environmental requirements.

Keywords

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Light gray kiln (self-alkali steam calcination kiln)
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  • Light gray kiln (self-alkali steam calcination kiln)

Light gray kiln (self-alkali steam calcination kiln)

The light ash kiln (self-regenerating alkali steam calcination kiln) is the core equipment for soda ash (sodium carbonate) production. It adopts the advanced "self-regenerating alkali" process, achieving high-temperature decomposition of sodium bicarbonate (heavy alkali) and continuous production of light sodium carbonate (light ash) through indirect steam heating. The equipment integrates mechanical transmission, thermal energy utilization, and material circulation technologies, featuring high efficiency, low consumption, environmental protection, and stability. It is suitable for the calcination process in soda ash production using the combined alkali or ammonia-soda methods.

Contact Information

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Phone: +86-18695999359

Email: sales@zszxjx.com

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