Asphalt has high viscosity and poor fluidity at low temperature. During long‑term storage in asphalt tanks, local temperature drop easily causes asphalt solidification, wall adhesion and pipeline blockage, which affects continuous feeding of construction equipment. Optimizing the insulation structure and heating‑pipe layout of the asphalt tank can form a uniform temperature field inside the tank, eliminate low‑temperature dead zones, prevent asphalt caking and plugging, and guarantee stable discharging in long‑period operation.

Analyze the causes of asphalt solidification and blockage. The tank wall and tank bottom lose heat rapidly. If heating pipes are sparsely arranged or concentrated only at the outlet area, large low‑temperature dead zones appear in the middle and upper part of the tank. The asphalt near the tank wall cools down and gradually thickens, forming hardened deposits adhering to the inner surface. Traditional single‑point heating leads to local overheating and asphalt aging, while other areas still suffer poor fluidity. Insulation layer aging, cracks and water infiltration greatly increase heat loss. Uneven heat distribution makes solid deposits accumulate continuously, eventually blocking the discharge pipeline and outlet.

Optimize the overall thermal insulation structure of the asphalt tank. Select high‑temperature‑resistant, low‑thermal‑conductivity composite insulation materials with good water resistance. Control the insulation thickness according to local ambient temperature, avoid insufficient heat preservation or excessive material waste. Seal all insulation joints tightly and add outer protective layers to prevent rainwater penetration and insulation failure. Reinforce thermal preservation at manholes, flanges, pipe penetrations and tank top, these positions are major heat‑leakage points and prone to asphalt condensation.

Carry out zoning design and layout optimization of heating pipes. Adopt combined heating layout of tank bottom coil pipes and tank wall vertical heating pipes. Arrange heating coils densely around the discharge outlet and tank bottom sediment zone to ensure the fluidity of asphalt near the outlet. Lay vertical heating pipes along the inner wall at intervals to heat the boundary layer and reduce asphalt crusting on the tank wall. Keep proper spacing between heating pipes, avoid local overheating caused by dense arrangement. Reserve enough gap between pipelines and tank plate for heat transfer, prevent local high‑temperature aging of asphalt.

Match heat‑conducting medium and temperature control strategy. Strictly limit the upper storage temperature. Excessively high temperature will accelerate asphalt aging and performance degradation, while too low temperature fails to maintain fluidity. Set independent temperature measuring points at tank wall, tank bottom and discharge pipeline, monitor temperature distribution in multiple regions. The control system adjusts the heat supply according to real‑time temperature feedback, realizes constant‑temperature heat preservation and avoids intermittent severe temperature fluctuation.

Optimize auxiliary measures combining stirring and cyclic circulation. A single heating system cannot solve the problem of static asphalt layering and local cooling. Cooperate with low‑speed agitator or external circulation pipeline to make asphalt flow gently, break static cold boundary layer and eliminate dead zones. The circulating pipeline shall also be equipped with heat tracing and insulation to prevent asphalt cooling and solidification during circulation.

Standardize daily maintenance and periodic inspection. Regularly check insulation layer damage, pipeline corrosion and heating pipe scaling. Clean hardened asphalt deposits on tank wall and tank bottom regularly before thick caking accumulates. Verify temperature sensor accuracy on schedule to avoid wrong temperature feedback leading to abnormal heating. Repair cracked insulation and leaking heat pipes in time to restore thermal performance.