ã€Abstract】 This paper introduces a composite heat pipe heat exchanger, which adopts a spiral groove fin-and-tube heat exchanger in the high temperature section and a heat pipe heat exchanger in the low temperature section to perform two-stage countercurrent heat transfer. It is successfully applied to gas. The field of waste heat recovery and utilization of cylinder quenching furnace, and discussed the enhancement of heat transfer measures and the saving rate of industrial furnace fuel.
The use of waste heat can save a lot of fuel, save transportation, reduce air pollution, improve working conditions, reduce floor space, increase production, increase by-products and reduce costs. The gas-fired cylinder quenching furnace has a flue gas temperature of 550-600 °C, and its heat loss is 20%-30%. It can effectively utilize a large amount of waste heat resources, which is a major issue for energy saving of industrial furnaces, and also improves the utilization rate of energy of enterprises. To solve the most effective way of contradiction between current energy supply and demand.
The heat treatment industry is a large energy consumer, accounting for 25% to 30% of the electricity used in the machinery processing industry. China's annual electricity consumption is about 10 billion kW•h, equivalent to 3.5 million tons of standard coal, and the comprehensive heat utilization rate of the resistance furnace is less than 30%. Direct fuel use is cheaper than electric heating. Natural gas is a primary energy source. The direct heat of the heat treatment furnace can obtain 50% thermal efficiency. The waste heat of the flue gas is used to preheat the air, the heating of the tempering furnace and the heating of the quenching oil and other domestic uses, so that the absolute heat utilization rate is over 80%. . The heat treatment process using natural gas as fuel is the most convenient and economical, and there is no environmental pollution. Using fuel exhaust heat to preheat the air is the most effective energy saving measure for the furnace. For example, the exhaust gas temperature is 700 ° C, and the heat loss rate of the exhaust gas is 40%. If the air is preheated to 300 ° C, the fuel can be saved to 15%. .
Author: Baoding city can heat transfer equipment Limited places Xintian