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EVENTS & NEWS
How to Improve the Thermal Efficiency of the Gas Fired Aluminum Melting Furnaces?
Release time:
Mar 29,2023
source:
Improving the melting efficiency of gas-fired aluminum melting furnaces can significantly reduce the cost of casting aluminum production. Therefore, all aluminum ingot casting production lines will try to improve the production process to improve the melting efficiency. One of the most important is to improve the thermal efficiency of the furnace. So, how to improve the thermal efficiency of the gas fired aluminum melting furnace? Today, Luoyang HTGP will give you a detailed introduction.
Increase the Preheating Temperature of the Combustion Air
Aluminum melting furnaces fueled by natural gas require preheating of the combustion air. Therefore, increasing the preheating temperature of the combustion-supporting air is beneficial to improving the thermal efficiency of the aluminum alloy melting furnace. According to research calculations, every time the preheating temperature of the combustion air increases by 100°C, the thermal efficiency of the aluminum melting furnace increases by 5%. Since the preheating temperature of the air in the heat-exchanging mold aluminum melting furnace is lower than that in the regenerative aluminum melting furnace, the former unit fuel consumption is higher than the latter. In the heat-exchanging mold aluminum melting furnace, the air preheating temperature using the ceramic heat exchanger is higher than that of using the metal heat exchanger, so the fuel consumption of the former is lower than the fuel consumption of the latter.
Oxygen or Oxygen-Enriched Combustion
The use of full oxygen or oxygen-enriched combustion is an effective measure to reduce fuel consumption and lower harmful gas emissions such as NO and NO2.
Setting the Proper Tilt Angle of Gas-fired Aluminum Melting Furnace
Influence of small furnace inclination angle on heat transfer efficiency. The pre-combustion gas has a certain directionality when it is sprayed from the small furnace mouth so that the combustion flame is close to the material and can increase the radiation and convective heat transfer coefficient between the flame and the material.
Control Air and Natural Gas Intake Velocity Ratio
For air and gas to mix well and have a good flame shape, the momentum of the air and gas must be equal. From this, we can calculate the suitable speed of air and natural gas.
Choose the Right Flame Shape
The flame shapes commonly used in kilns are horseshoe flame and straight flame. Horseshoe-fired kilns with the same output have higher thermal efficiency than direct-fired kilns. However, it should be combined with the quality of the product to choose the appropriate flame shape.
Controlling Air and Gas Intersection Angles
The intersection angle of two streams of preheated combustion air and natural gas has a huge influence on combustion efficiency. According to the flow rate and velocity of the combustion air and natural gas, the appropriate intersection angle of the two is determined by an empirical formula.
Increased Swirl of Natural Gas Stream
Increase or improve the swirl slice of the natural gas burner.
Effective Use of Waste Heat
The waste heat of the flue gas of the kiln can be used to produce high-pressure and low-pressure steam. We can use the former to generate electricity and drive the turbine air compressor to work while the latter for heating fuel. The flue gas from the boiler can re-enter the heat exchanger for preheating. By applying this system, we can increase the thermal efficiency to more than 70%, much higher than the thermal efficiency of traditional aluminum melting furnaces of 25% to 45%.
Summary
Improving the thermal efficiency of combustion is an effective way to increase the melting efficiency of gas fired aluminum melting furnaces. However, once thermal efficiency reaches a certain level, additional investment and improvement have little effect. Everyone is also constantly exploring new methods of melting aluminum. An intermediate frequency aluminum melting furnace came into being.
Intermediate Frequency Aluminum Melting Furnace
The intermediate frequency aluminum melting furnace is of fast melting speed, high melting efficiency, low burning loss rate, a high recovery rate of waste aluminum, and low energy consumption. Intermediate frequency aluminum melting furnace is the most popular aluminum melting equipment in the market.
About HTGP
Luoyang HTGP is a professional manufacturer of intermediate frequency aluminum melting furnaces. According to different customer needs, we can provide medium frequency aluminum melting furnaces with output ranging from 0.1 to 5 tons. Moreover, we also offer professional installation and after-sales service to solve customers' worries.
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