Method for Obtaining Resistance of Finned Tube Array of Waste Heat Boiler

Abstract

The invention discloses a method for obtaining the resistance of a fin tube array of a waste heat boiler. The method comprises the steps of in a fin tube array, selecting several adjacent fin tubes to form a resistance unit with a regular shape; wherein the resistance unit forms a flue gas duct for flue gas to pass through; obtaining the flow-through volume of the flue gas duct and the friction surface area with effective contact with the flue gas, wherein in the calculation of the flow-through volume and the friction surface area, the thickness, height and quantity of the fin tubes are all accounted for, thus obtaining the resistance of the fin tube array of a waste heat boiler. According to the technical scheme, a resistance units with a regular shape is selected for the calculation, the calculation manner is simplified. Moreover, in the calculation process of a volumetric hydraulic diameter, the thickness, height and quantity of the fins are accounted for, thus making the fins which occupy an important part in the fin tubes be accounted for in the calculation of volumetric hydraulic diameter, and therefore the resistance calculation results are guaranteed to be more precise.

Description

technical field [0001] The invention relates to the technical field of waste heat boilers, in particular to a method for obtaining resistance of fin tube arrays of waste heat boilers. Background technique [0002] The power plant is usually equipped with a waste heat boiler. When the flue gas flows through the waste heat boiler, it needs to cool down and recover heat. Generally, a heat exchanger is installed inside the waste heat boiler. The heat exchanger includes several rows of heat exchange tubes. The heat exchange tubes have fins, which are also called finned tubes 10 in the field. Several rows of finned tubes 10 form a finned tube array. 100. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of the arrangement of finned tube arrays in the waste heat boiler. [0004] The finned tube array 100 has the advantages of high heat exchange efficiency, small heat transfer temperature difference, good temperature uniformity, etc., and has a good applicat...

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Problems solved by technology

[0006] However, according to the way of obtaining resistance in the prior art, due to the complicated structure of the fin-tube array 100, it is difficult to carry out equivalent simulation; when using the empirical formula of resistance drop for actual calculation, also due to the complex structure of the fin-tube array 100, the equivalent calculation results It is often not accurate enough. According to the actual feedback, the calculated resistance value is too large, resulting in the improvement based on the calculated data, which cannot achieve the expected effect.

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