After examination, the oil furnace is working properly. Check bitumen found the circulatory system, the temperature of the asphalt mainly the conveying line, causing the line of bitumen solidification. Analysis that resulted in this outcome There are four reasons: First, the high thermal oil tank is too low, resulting in thermal oil circulation; Second, the double eccentric inner tube tube; Third conducting oil pipeline is too long; fourth is due to the thermal oil pipe insulation measures are not adopted.
The high thermal oil tank from the ground less than 3m, while the oil circulation pipe 5m from the ground up to the highest point. After the end of the asphalt mixing plant work, because of the height difference, high circulating tube HTF HTF high tank all back, but a lot of air into the oil circulation tube. When the asphalt mixing plant working again, oil circulation pump can not put high oil circulation pipe is completely drained of residual air to form air resistance, so they lead to poor oil circulation, affecting heating effect.
The asphalt mixing plant asphalt pipes with double tube structure, namely oil heating the outer tube and inner tube transporting bitumen. After the demolition of asphalt pipes found, due to the production of double-tube, not the inner tube in the center of the outer pipe welding, pipe leading to the inner tube double eccentric. Butt duct flange at the asphalt, oil pipe connecting joints precisely welded pipe eccentric side of the gap is too small, which led to the joint HTF flow decreases. Residual bitumen production and delivery tube dross and impurities deposited on the eccentricity of the small gap, resulting in a sharp decrease of the thermal fluid flow fittings, resulting in lower heating efficiency of the thermal fluid delivery tube pitch.
HTF piping is too long, the end of the pipeline will transport HTF insufficient pressure, the pipeline ends HTF cooling too quickly. When the ambient temperature is low, oil pipe insulation measures are not adopted, HTF will exacerbate heat loss.