The molten salt furnace is an upright cylindrical coil-type tube structure. The heating surface is composed of inner and outer spiral coils arranged in two layers. The burner is placed in the center of the furnace top and the flame of the combustion chamber is from the top to the bottom and the inner layer disk. After the radiation heat exchange on the inner side of the tube, the high-temperature flue gas generated by combustion enters the first convection heat exchange zone composed of the inner and outer coils from the bottom to the bottom of the inner coil tube, and then passes through the convection heat exchanger. The second convection heat exchange zone formed by the upper part of the coiled tubing entering the outer coil and the shell is exhaled from the exhaust port at the lower part of the housing after the convection heat exchange from top to bottom. The molten salt heat carrier is fed into the furnace in 8 passes through the lower header (5 in the inner coil and 3 in the outer coil). After the heat is absorbed in the furnace, it is collected in the upper header and discharged from the upper header. . The outer coil is supported on the hearth support, and the inner coil is hung on the shell by a hanging device. The furnace body is shipped in a fully assembled form after the manufacturing plant is manufactured.

　　In the 350 ~ 600 °C temperature range, molten salt is usually used as a heat carrier.

　　The currently used molten salt is a ternary inorganic salt: a melt mixture formed after melting, belonging to dangerous articles. Compared with the heat transfer oil, the molten salt can obtain a higher use temperature under similar pressure, and has good thermal stability. Its main physical characteristics data are as follows: The melting point is 142°C. At a density of 150°C, the temperature decreases linearly within this temperature range. The kinematic viscosity decreases exponentially with increasing temperature and approaches a stable value at 400-550°C. Specific heat capacity Thermal conductivity (at 500°C). Solid salt expansion coefficient Melting salt expansion coefficient.