Relationship between industrial furnace and energy saving and emission reduction

Industrial furnace is a big energy consumer and polluter in China. How to save energy and reduce emissions is an important problem facing China's industry. According to the operation status and existing problems of domestic industrial furnace, this paper puts forward a variety of energy saving and emission reduction measures, such as fuel substitution, combustion system transformation and waste heat and pressure utilization, in order to improve the energy efficiency of industrial furnace and achieve good results of energy saving and emission reduction.

The energy consumption of industrial furnace is affected by many factors, but the main measures of energy saving are generally inseparable from optimization design, improvement of equipment, recovery of waste heat utilization, strengthening detection control and production management. There must be scientific measurement and comparative test methods for energy saving. At present, the generally accepted test method is heat balance test. Through the thermal measurement of the industrial furnace, the thermal process of the industrial furnace is comprehensively understood, the "illness" of the heating furnace is analyzed and diagnosed, the "cause" of the disease is found out, and the energy-saving technical transformation is carried out, so that the thermal efficiency of the heating furnace is further improved and the unit consumption is reduced, And get the parameters of the economic and technical performance index of the heating furnace, analyze the operation of the heating furnace, timely adjust the working conditions of the heating furnace to achieve the best state of operation, so as to find out the effective way and direction of energy saving.

Combustion device is the heart part of the furnace, its working quality directly affects the amount of energy consumption. At present, the burners successfully used in industrial furnaces in China include adjustable flame burners, flat flame burners, high speed burners, self preheating burners, low nitrogen oxide burners, etc. Recently, regenerative burners have been developed, which provide a variety of advanced burners to adapt to the use of gas and diesel. The correct use of high efficiency advanced burner can save more than 5% energy. Among them, flat flame burner, high speed burner and self preheating burner are widely used. Flat flame burner is most suitable for heating furnace. High speed burner is suitable for all kinds of heat treatment furnace and preheating furnace itself. Burner is a kind of combustion device which combines burner, heat exchanger and smoke exhaust device. It is suitable for heating, melting, heat treatment and other industrial furnaces. In addition, it is also an effective energy-saving measure to select the energy-saving combustion device with good performance and the matching fans, oil pumps, valves, as well as the thermal detection and automatic control system according to the type of fuel to ensure good combustion conditions and control and regulation functions. Conventional energy-saving combustion technologies include high temperature air combustion technology, oxygen enriched combustion technology, emulsification technology of heavy oil mixed with water, oxygen enriched pulverized coal injection technology of blast furnace, magnetization treatment technology of common furnace fuel before entering the furnace, etc. The application of these technologies in industrial furnace has achieved certain energy saving effect. High temperature air combustion technology and oxygen enriched combustion technology are widely used.

Furnace structure and building materials

When designing or improving the furnace, we should choose the appropriate furnace structure and new energy-saving materials according to the requirements of the production workers, so as to improve the mechanization degree and energy utilization rate. Measures commonly adopted at present

1. The effect of uniform heat transfer can be enhanced by using a circular furnace instead of a box furnace. The thermal efficiency can be improved by using a reasonable furnace space and increasing the heat exchange surface between the furnace and the workpiece without increasing the volume of the furnace space. Due to the adoption of the circular furnace body, the area of the outer wall of the furnace is reduced, and the heat loss of the furnace wall is correspondingly reduced. A kind of

2. High speed burners or fans are used to enhance the convective heat transfer in the furnace. In particular, the high-speed air flow in small heating furnace can destroy the stagnant surface of the workpiece, hinder the heat transfer and interface reaction, shorten the heating time and accelerate the increase of the temperature of the workpiece.

3. The sealing of furnace body includes the sealing of furnace shell and door. The appearance of refractory fiber products creates conditions for solving the sealing problem of furnace body and realizes soft sealing.

4. Adopt new energy-saving refractory compound lining. The furnace with integral refractory castable has high strength, integrity, good air tightness, long service life, good air tightness of ceramic fiber lining, low temperature of furnace surface and long service life. A kind of

5. On the premise of ensuring the structural strength and heat resistance of the furnace, the lining structure should try to improve the heat preservation capacity and reduce the heat storage and heat loss. The refractory fiber and rock wool are selected as the insulation layer, and the light brick is used as the lining of the furnace body to reduce the heat storage loss of the furnace body, enhance the heat insulation of the furnace, and reduce the heat loss of the furnace wall.

6. Coating high temperature and high radiation coating on the inner wall of furnace lining can enhance the radiation heat transfer in the furnace and help to make full use of the heat energy. The energy saving effect is 3% to 5%.


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