Rectangular Tilting Aluminum Melting Furnace Supports Remelting and Melt Adjustment

Product Overview

The Regenerative Aluminum Melting Tilting Furnace is a natural gas-fired melting system designed for aluminum processing, recycled aluminum, and aluminum alloy casting applications.

The furnace described in the PDF uses a rectangular, single-chamber hydraulic tilting structure. It is designed for melting aluminum and aluminum alloy scrap, followed by skimming, refining, and molten aluminum temperature adjustment.

Key Product Specifications

• Furnace Type: 20-ton tilting aluminum melting furnace
• Structure: Rectangular, single chamber, hydraulic tilting
• Fuel: Natural gas
• Combustion: Regenerative combustion
• Combustion-air preheating: Around 1000°C
• Main exhaust temperature: ≤200°C
• Regenerative heat recovery: >85%
• Melting rate: ≥4 t/h
• Unit gas consumption: ≤65 Nm³/t-Al
• Normal molten aluminum temperature: 690–760°C
• Maximum working temperature: 1200°C
• Molten aluminum level accuracy: ≤±2 mm
• Hydraulic system design pressure: 16 MPa

The melting-rate and gas-consumption figures are performance guarantees under specified test conditions.

Regenerative Combustion System

Heat Recovery and Air Preheating

The furnace uses a pair of regenerative burners operating alternately between combustion and exhaust. One burner fires while the other absorbs heat from the flue gas through regenerative media. After reversing, the stored heat is used to preheat combustion air.

The proposal specifies combustion-air preheating around 1000°C, main exhaust temperature of ≤200°C, and stated regenerative heat recovery efficiency above 85%.

The >85% figure refers to the regenerative combustion system and should not be interpreted as the overall energy efficiency of the complete furnace under every operating condition.

Melting Performance and Gas Consumption

Defined Performance Test Conditions

The furnace performance guarantee specifies a melting rate of ≥4 t/h and unit gas consumption of ≤65 Nm³/t-Al.

The acceptance test uses 100% aluminum ingots as raw material, with melting time calculated until molten aluminum reaches 720°C. Actual performance can vary with raw material, charging method, target temperature, and operating conditions.

Hydraulic Tilting and Molten Aluminum Control

Hydraulic Discharge

Two hydraulic tilting cylinders and proportional-valve control provide continuous adjustment of tilting speed. The tilting operation can be coordinated with casting speed or controlled by the casting machine. The hydraulic system has a design pressure of 16 MPa.

Laser Level Detection

A laser rangefinder continuously detects molten aluminum level, while an encoder measures furnace tilting angle. The electronic closed-loop system specifies molten aluminum level control accuracy of ≤±2 mm, with maximum-level protection and automatic return functions.

Automatic Combustion Control

The regenerative combustion system uses PLC control for purging, automatic ignition, burner reversing, and flame monitoring. The proposal specifies a S7 PLC and flame detection equipment, with main-flame shutdown and alarm functions in the event of flame failure.

Variable-frequency control is also used for the combustion and exhaust fans to adjust airflow according to operating requirements and support furnace-pressure control.