1. Composition and principle
(3, 6, 7, 8, 10), the heat-conducting oil interlayer (5,11), the heat-conducting oil pump 9, the heat-conducting oil pump 9, the heat-conducting oil pump 9, the heat- Asphalt tank 12 and a mixture tank 13, as shown in Fig. The asphalt tank in the asphalt capacity of 500L, the capacity of the mixture is 2 m3.
A double heating pipe 1 is provided in the asphalt tank 12, and the heat transfer oil interlayer 11 between the inner and outer tubes is filled with the heat transfer oil. The high-temperature gas generated during combustion of the combustor 2 flows in the double-layer heating pipe to heat the heat transfer oil in the heat-conducting oil interlayer 11. The heat- The heated heat transfer oil is first heated in the asphalt tank 12, and then the heated heat transfer oil is conveyed to the heat conducting oil interlayer 5 through the heat transfer oil pump 9, and the asphalt mixture in the mixing tank 13 is finally passed through the heat conducting oil interlayer 5 Material for heating.
The heating and heating system has two functions of heating and holding, can be asphalt and asphalt mixture and other pavement materials heated at constant temperature, and can maintain its temperature in the construction of the required temperature.
Asphalt tank 12 is both asphalt insulation tank, but also heating insulation furnace. The integrated asphalt mixture in the asphalt mixture, although there is a certain temperature of the plant mix asphalt mixture of finished products, but in its transport process, may be due to long transport distance and other reasons leading to its temperature dropped below the construction temperature. To this end, the use of conductive oil on the asphalt mixture to heat insulation. When only the asphalt in the asphalt tank 12 is heated, the shut-off valves 3, 7, 8, 10 are opened and the shut-off valves 4, 6 are closed. Under the action of the heat transfer oil pump 9, the heat transfer oil is circulated in the heat conducting oil interlayer 11. When it is necessary to heat the asphalt in the asphalt tank and to keep the asphalt mixture in the mixing tank 13, it is necessary to close the shut-off valve 7 and open all other shut-off valves. Under the action of the heat transfer oil pump 9, the heat transfer oil is circulated in the heat conducting oil interlayer (5, 11) in the asphalt tank 12 and the mixing tank 13.
2. Heat calculation required for system insulation
According to JT / T276-2004 asphalt sprinkler industry standards and the Ministry of Transportation issued the "asphalt spreading machine" standards and related experience, asphalt spreading machine insulation performance must meet the following requirements: the initial temperature of 150 ℃, the ambient temperature of 15 ~ 20 ℃ conditions, after 8h, the asphalt temperature drop shall not exceed 20 ℃.
3. Heat insulation device selection
Do a good job of heating insulation device selection work, can ensure that the asphalt and mixture heating and heating temperature, to maintain its good physical properties, so as to meet the construction requirements.
The outer wall of the heating tube is in direct contact with the asphalt mixture in the asphalt tank and the mixture tank to form the heat transfer area. Asphalt tank tube row of heat transfer area is to determine whether the heating and heating system is reasonable key. If the heat transfer and small, it can not give full play to the heating capacity of the heat transfer oil, resulting in energy waste; if the heat transfer area is too large, it will occupy too much space within the asphalt tank to increase manufacturing costs and maintenance difficulties.