The industrial furnace is a big energy consumption and polluter in Our country. How to save energy and reduce emission is an important problem facing our industry at present. In view of the operation status and existing problems of domestic industrial furnaces, this paper puts forward various measures of energy saving and emission reduction, such as fuel replacement, combustion system transformation and waste heat and pressure utilization, in order to improve the energy efficiency of industrial furnaces and achieve good results in energy saving and emission reduction.
The energy consumption of industrial furnace normalizing 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 of detection control and production management. Energy conservation must have scientific measurement and comparative testing methods. At present, the accepted test method is heat balance test. Through to the industrial furnaces are measuring comprehensive understanding of the industrial furnace thermal furnace thermal process analysis, diagnosis, furnace "illness" to find the "cause" to further improve thermal efficiency of heating furnace for energy saving technical reconstruction to make consumption down, and to obtain the parameters of heating furnace operation economic and technical performance indicators analysis of heating furnace operation timely adjustment to the operation of the furnace conditions best so as to find out the effective ways to save energy and direction.
The burning device is the heart part of the furnace and how well it works directly affects how much energy it USES. At present, the burners successfully used in industrial furnaces include adjustable flame burner, flat flame burner, high speed nozzle, self-preheating burner, low nitrous oxide burner, etc. Recently, regenerative burner has been developed to provide a variety of advanced burners for gas and diesel. The correct use of efficient advanced burners can generally save more than 5. Among them, widely used are flat flame burner, high - speed burner and self - preheating burner. The flat flame burner is most suitable for the use of high speed burner on the heating furnace. It is suitable for all kinds of heat treatment furnace and preheating furnace. The burner is a kind of combustion device which combines burners, heat exchangers and smoke exhaust devices into one. In addition, it is also an effective energy saving measure to select the energy-saving combustion device with good performance according to the fuel type and the corresponding fan, oil pump, valve parts and thermal inspection and automatic control system to ensure good combustion conditions and control regulation functions. The conventional energy-saving combustion technologies include high temperature air combustion technology, oxygen-enriched combustion technology, heavy oil mixed with water emulsification technology, oxygen-enriched blast furnace pulverized coal injection technology, and magnetization treatment technology before the fuel is put into the furnace. The application of these technologies in industrial furnaces has achieved a certain energy-saving effect. Among them, high temperature air combustion technology and oxygen-rich combustion technology are widely used.
Furnace structure and building materials
In the design or improvement of the mesh belt type quenching furnace, the appropriate furnace structure and new energy-saving materials should be selected as far as possible according to the production requirements to improve the degree of mechanization and energy efficiency. Current measures commonly used are
1. Adopting circular furnace instead of box furnace can enhance the uniform heat transfer effect of furnace on workpiece by adopting reasonable furnace space and increasing the heat exchange surface with workpiece on the premise of not increasing the furnace space volume, thus improving the thermal efficiency. Because of the use of circular furnace body to reduce the furnace wall area and wall heat loss accordingly reduced.
2. Adopt high speed burner or set fan in furnace to enhance convection heat transfer. In particular, the high-speed air flow in a small heating furnace can destroy and stop the heat transfer on the surface of the workpiece and at the bottom of the gas boundary of the reaction furnace at the interface, which can shorten the heating time and increase the temperature of the workpiece.
3. The furnace body seal includes the seal of the furnace shell door, etc. of each leading member in the furnace chamber. The appearance of refractory fiber products created the conditions for solving the furnace seal and realized the soft seal.
4, the use of new type of energy-saving refractory composite furnace lining. Refractory castable furnace with high strength, integrity, good air tightness, long life ceramic fiber furnace lining good air tightness, low temperature outside the furnace, long service life.
5. On the premise of ensuring the structural strength and heat resistance of the furnace, the furnace lining structure should try to improve the heat preservation capacity and reduce the heat storage and heat dissipation losses. Refractory fiber, rock wool and so on are selected as insulation layer and light brick is used as lining of furnace body to reduce heat storage loss of furnace body, enhance heat insulation and heat preservation of furnace and reduce heat dissipation loss of furnace wall.
6, coating the inner wall of the furnace lining with high temperature and high radiation coating to enhance the radiant heat transfer in the furnace is conducive to the full use of heat energy, its energy-saving effect is 3% to 5%.
On 2018-08-08 11:45:46
