What are the methods of heating asphalt?

(1) Direct heating with naked flame \x0d\ This is the most primitive and common asphalt heating method. There are two ways to directly heat asphalt with naked flame: direct heating from the outside and direct heating from the inside. At present, the method of internal direct heating is the most widely used. Although this method is common, the local temperature is too high, the temperature difference between asphalt and heater is huge, and the fluidity of asphalt is poor, which seriously affects the ductility and cohesiveness of asphalt. \x0d\\x0d\ (II) Fuel or gas heating \x0d\ Crude oil, heavy oil, diesel oil, residual oil, coal tar, gas and natural gas are used as heating fuels, with simple heating equipment, fast heating speed and environmental protection. However, measures should be taken to prevent asphalt aging and production safety during heating. It is best to use continuous circulation heating to prevent the local temperature of asphalt from being too high. \x0d\\x0d\ (3) Heat transfer oil heats asphalt. \x0d\ This is a heating method with heat transfer oil as heat carrier. The technological process of heating asphalt with heat transfer oil is simple and convenient, with pressure in the equipment department, safe and reliable operation, high production efficiency, low heating cost, low labor intensity and little environmental pollution. Heat transfer oil heating is an advanced heating technology, which has been widely used. \x0d\\x0d\ asphalt rapid heater adopts vortex hot film heat exchanger technology (national patent product, patent number: 02268208.2), and successfully designs and develops a new type of rapid heater (national patent product, patent number: 200720029405.3), which has achieved good results in practical application, obvious energy saving and effectively solved the problem of excessive energy consumption during heating. \x0d\\x0d\ This brand-new asphalt rapid heating technology: after the heat transfer oil enters the "rapid heater", the asphalt in the asphalt tank is quickly heated locally, and as much asphalt as needed is heated, so it is not necessary to heat the whole tank repeatedly, saving energy and making the asphalt output faster. The fluidity of asphalt is fully improved, which makes the storage and transportation of asphalt more convenient and greatly improves the convenience of asphalt use.