Heat exchange system for reducing ash accumulation and enhancing heat exchange based on corrugated heat exchange fins

Abstract

The invention discloses a heat exchange system for reducing ash accumulation and enhancing heat exchange based on corrugated heat exchange fins. The heat exchange system comprises a flue and a heat exchanger. The heat exchanger comprises multiple heat exchange base pipes and the multiple heat exchange fins. The heat exchange base pipes are distributed in a serpentine manner. A working fluid inletin one end and a working fluid outlet in the other end of each heat exchange base pipe both are located outside the flue. The middle of each heat exchange base pipe is located in the flue. All the heat exchange fins are located in the flue. The outer wall of each heat exchange base pipe is sleeved with the corresponding heat exchange fin. The side faces of all the heat exchange fins are correspondingly provided with heat exchange enhancement corrugations and anti-ash-accumulation corrugations for guiding fly ash in flue gas in the flue to weak regions of the heat exchange base pipes. By the adoption of the system, the back faces of the heat exchange base pipes are not likely to generate accumulated ash, the heat exchange effect is good, and the flue gas resistance and the vortexes in the weak regions are small.

Description

technical field [0001] The invention belongs to the technical field of heat exchange enhancement, and relates to a heat exchange system based on corrugated heat exchange fins for reducing dust deposition and enhancing heat exchange. Background technique [0002] The exhaust heat loss is the largest among all heat losses of power plant boilers, generally 5% to 8%, accounting for about 80% of the total heat loss of the boiler. With the vigorous implementation of energy saving and emission reduction policies, the utilization of waste heat from flue gas in thermal power plants has become one of the focuses of research and transformation at the present stage, and the low-temperature economizer has been widely used as the main equipment for the utilization of waste heat from exhaust gas. A heat exchanger is installed between the heater and the electrostatic precipitator to reduce the inlet smoke temperature of the electrostatic precipitator to about 90°C, and the absorbed heat can...

AI Technical Summary

Problems solved by technology

Round pipes are easy to manufacture and widely used, but they have high resistance, large eddy currents in the wake area, and dust accumulation on the leeward surface

The elliptical tube is based on the circular tube, and is cold-drawn through an elliptical mold. The resistance is 10% lower than that of the conventional circular tube, and the heat exchange capacity is equivalent to that of the circular tube, but there is still room for optimization in the wake area

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