Introduction to the results: Large and medium-sized industrial electric heaters usually adopt multi-circle annular layered arrangement of U-shaped electric heating tubes, and arched baffles support the tube bundles. The spacing between the U-shaped electric heating tubes and tubes is different, resulting in uneven flow field distribution. Moreover, there are shortcomings such as flow dead zones, low heat transfer coefficients, large flow resistance, easy induction of vibration and fouling, uneven surface temperature of the electric heating tubes, easy formation of local hot spots, and shortening of service life. The oblique sun-shaped unit regular triangular tube distribution spiral baffle electric heater is arranged according to a regular triangular grid, and the flow direction is basically unchanged. It has the advantages of high efficiency and low resistance. It can save the heat transfer area of the electric heater by more than 30[%]. The surface temperature is low and uniform, and the service life is extended; laser cutting is used, which is convenient to manufacture and low in cost.

Technical characteristics: The three-part spiral baffle electric heater is a new scheme optimized and improved for the arched baffle electric heater with the multi-turn annular layered tube layout method commonly used in industrial engineering. The "oblique day" unit annular tube layout scheme solves the problem that the shell size is large when maintaining the minimum tube spacing due to the non-uniform tube spacing in the multi-turn annular tube layout scheme, and it is unfavorable to flow and heat transfer; Replacing the arcuate baffles with circumferentially overlapping three-part spiral baffles to enhance the flow and heat transfer performance of the electric heater, while inheriting the high efficiency and low resistance characteristics of the spiral baffles, it avoids the shortcomings of flow dead zones and heat transfer coefficients in the arcuate baffle scheme., large flow resistance, easy induction of vibration, easy fouling, etc., which greatly improves the temperature uniformity problem on the surface of the heating tube. On this basis, in order to improve the inconvenient processing, installation and fixing of the three-part spiral baffle, a folded lug three-part spiral baffle was designed, and the two ends of the original sector-part spiral baffle were bent close to the pull rod hole. The folded lug baffle plan further improves the leakage flow in the triangular area. At the same time, the annular end plate in the original three-part plan is eliminated, and its negative impact on obstructing fluid is eliminated, the flow field and temperature field are optimized, and the electric heater is prolonged. Life, and the structure is compact. It is convenient to process and simple to position and install. Because each set of pull rod sleeve can fasten two groups of adjacent baffles, the number of pull rod sleeve groups is also the minimum, which has a good effect on the energy-saving optimization design of the electric heater.