Nonuniform finned radiator for Heller type indirect air cooling system

Abstract

The invention discloses a nonuniform finned radiator for a Heller type indirect air cooling system. The nonuniform finned radiator comprises a top portion, a middle portion and a bottom portion along the height direction, heights of the top portion, the middle portion and the bottom portion are h1, h2 and h3 respectively, and distribution spaces of cooling fins of the top portion, the middle portion and the bottom portion are d1, d2 and d3 respectively; when h1 is larger than or equal to 0.02H and smaller than or equal to 0.25H, h2 is larger than or equal to 0.5H and smaller than or equal to 0.96H, and h3 is larger than or equal to 0.02H and smaller than or equal to 0.25H, d1 is larger than or equal to 1.1d and smaller than or equal to 3.5d, d2 is equal to d, and d3 is larger than or equal to 1.1d and smaller than or equal to 3.5d, wherein H refers to the length of the radiator with the cooling fins, and d refers to a spacing of the cooling fins in uniform arrangement. The nonuniform finned radiator has the advantages that distribution of the fins is optimized, ventilation resistance of each of the bottom portion and the top portion of the radiator is reduced, vortexes of a back area of the radiator are weakened, and integral heat exchange performance of the radiator is improved; due to decrease of the number of the fins, a small quantity of aluminum resources can be saved.

Description

technical field [0001] The invention relates to a non-uniform fin radiator for Heller type indirect air cooling system. Background technique [0002] Compared with thermal power units using wet cooling towers, dry cooling towers or direct air cooling systems can save 65%-90% of water, which is of great significance for the sustainable development of the power industry in areas rich in coal and short of water. Dry cooling system can be divided into direct air cooling system and indirect air cooling system (hereinafter referred to as intercooling system). According to the type of condenser and the arrangement position of radiator, intercooling system can be divided into Heller type and Harmon type. , SCAL type. In the intercooling system, since the heat transfer between the gas and water phases is non-contact heat transfer, the cooling limit is the dry bulb temperature of the ambient air, making the average coal consumption 3.3%-6.2% higher than that of the wet cooling unit. ...

AI Technical Summary

Problems solved by technology

[0004] Air flowing through the radiator area is a heat-absorbing and heating-up process. During the actual operation of the Fogo radiator with evenly arranged fins, the local heat exchange area is the same as that in the middle area for the bottom and top areas of the radiator. However, Due to the influence of the ground and top sealing plates, the air flow rate is low, which will inevitably cause the local heat transfer capacity in this area to be lower than that in the middle of the radiator. Based on the optimal aerodynamic field theory of cooling towers, the aerodynamic field, temperature field and gas The more balanced the heat transfer driving force between the two phases of water, the stronger the overall heat transfer capacity. Therefore, the aerodynamic field of the radiator with evenly arranged fins is not the best matching relationship with the local heat transfer area; Different, vertical vortexes are prone to appear on the back of the radiator, resulting in local resistance, which is not conducive to the circulation of air, and is not conducive to the heat dissipation of the radiator as a whole, resulting in a decrease in the cooling efficiency of the air cooling tower

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