JZL Series Rotary-Drum Slag Cooler

JZL series rotary-drum slag coolers are suitable for hot slag cooling and waste heat recovery in carbon graphitization and circulating fluidized bed boilers.

Key Features and Advantages:

This equipment combines the advantages of foreign products and adopts a double-layer cylinder with continuous helical heat transfer fins, which has higher heat transfer efficiency than blade-spiral drums.

• Cooling medium mainly uses water cooling, supplemented by air cooling.
• The transmission mechanism adopts a variable frequency speed control system, which can be manually adjusted or automatically adjust the slag cooler output according to changes in equipment thermal load.
• Energy Saving: This equipment can also utilize the heat of the cooling medium, thereby achieving the purpose of reducing energy consumption and improving economic benefits.
• Designed and developed to meet the requirements of carbon graphitization and circulating fluidized bed boilers developing towards larger capacities.

Cooling Water Usage:

The cooling water for large-scale unit drum slag coolers is generally taken from the outlet of the condenser condensate pump and returned to the outlet of the last-stage low-pressure heater.

Based on a condensate pump outlet water temperature of 45℃, a cooler outlet temperature of 95℃, a slag inlet temperature of 950℃, and a slag outlet temperature of 100℃, 4.08 tons of cooling water are required per ton of slag, saving a large amount of water resources. At the same time, the thermal energy released by the hot slag can be fully recovered and utilized.

Cooling Medium & Air Cooling Considerations:

The cooling medium is mainly water, suitable for softened water.

Air cooling has a minor effect (generally no more than 5%), but its air outlet needs to be connected to the induced draft system (usually connected to the dust collector inlet); otherwise, dust will escape from the slag cooler and pollute the environment.

Cooling Water Flow Rate Formula:

Technical Specifications