Cascade-type cooling air guides for direct air cooling units

Abstract

The invention discloses a cascade-type cooling air diversion device of a direct air cooling unit. The cooling air diversion device comprises an air-cooling fan and two finned-tube bundles arranged on the left side and the right side of the air-cooling fan, the upper ends of the finned-tube bundles are connected through a steam tube, the lower ends of the finned-tube bundles are connected with the two ends of the air-cooling fan respectively to form an A-shaped channel, the two sides of the upper edge of the air-cooling fan are each provided with 4-6 arc-shaped diversion blades which are symmetrically arranged, and the diversion blades are arranged in the A-shaped channel. According to the cascade-type cooling air diversion device of the direct air cooling unit, the A-shaped channel in the direct air cooling unit is utilized, the cascade-type cooling air diversion device is arranged to recombine an air flow field at an outlet of an axial flow fan, a cooling air flow which is irregular and has a rotational flow uniformly flows to the finned-tube bundles as much as possible after being guided by the cascade-type cooling air diversion device, the tube bundle heat transfer area is fully utilized, the heat transfer characteristic of the air cooling unit is improved, and the running safety and economical efficiency of an air cooling system are improved.

Description

technical field [0001] The invention relates to the technical field of energy and power, in particular to a cascade-type cooling air guide device of a direct air-cooling unit. Background technique [0002] The contradiction between rich coal and water shortage in northern my country has promoted the development and promotion of air cooling technology for power stations. The direct air-cooling system is an air-cooling island composed of dozens of air-cooling units. The air-cooling unit is composed of a finned tube bundle and an axial flow fan. Just below the "A"-shaped structure, the air-cooling unit is forced to ventilate and cool down by an axial flow fan. In actual operation, the diameter of the air-cooled axial flow fan is large, the flow field at the outlet of the fan is extremely uneven, and the axial speed and radial speed change significantly along the radial direction. In addition, the finned tube bundles of the air-cooling unit are arranged in an "A"-shaped obliqu...

AI Technical Summary

Problems solved by technology

In addition, the finned tube bundles of the air-cooling unit are arranged in an "A" shape, the flow velocity in the space is not uniform, and the air velocity on the windward side of the tube bundle is also unevenly distributed, resulting in uneven air temperature field, which makes the effective use of the air-cooled finned tube bundles The efficiency is reduced, the cooling effect is deteriorated, and the performance of the air cooling unit is reduced

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