Shunt and closure type flow guide device for tubular gas-gas heater flue system

Abstract

The invention relates to a shunt and closure type flow guide device for a tubular gas-gas heater flue system. The shunt and closure type flow guide device is arranged on a flue curve of an original flue in the upstream of an inlet of a heat exchanger, and is composed of an arc-shaped lamellar structure and a straight lamellar structure; the convex surface of the arc-shaped lamellar structure facesthe direction of flow incoming of flue gas and plays the closure role; the straight lamellar structure is located on the rear part of the arc-shaped lamellar structure and plays the shunt role; and the bottom end of the arc-shaped lamellar structure is closely connected with the front end of the straight lamellar structure, incoming flow is shunted and stopped through the shunt and closure type flow guide device, two fluid with similar radial velocity magnitude and opposite directions are obtained after streaming, and the radial velocity of the fluid is mostly and mutually cancelled out afterconverging, so that the velocity direction of a main flow field is parallel to the flue direction. The shunt and closure type flow guide device plays the shunt and closure roles on the flue gas, an unsteady flow area can be away from the inlet of the heat exchanger and migrate to the flue curve, and the main flow field parallel to the flue direction is formed near the inlet of the heat exchanger,so that the uniformity of flow fields near the inlet of the heat exchanger is improved.

Description

technical field [0001] The invention relates to a tube-and-pipe GGH flue system, in particular to a diversion-cut-off flow guide device for the tube-and-tube GGH flue system. Background technique [0002] In the wet flue gas desulfurization process of thermal power plants, when the exhaust gas temperature is as low as about 50°C, the outlet of the chimney will appear in the form of white water mist, accompanied by the generation of gypsum rain, causing environmental pollution. In order to avoid this situation, Germany and Japan installed flue gas-flue gas heat exchangers (GGH) after flue gas desulfurization (FGD) in the last century. Corrosion problems of existing chimneys, enhanced dispersion of pollutants, reduced water consumption and increased flue gas discharge temperatures. [0003] GGH has high requirements on the uniformity of the flue gas flow field near the inlet of the heat exchanger. Before the flue gas enters the heat exchanger tube bundle, if the flow rate is...

AI Technical Summary

Problems solved by technology

However, this kind of scheme is not only difficult to implement, requires a lot of consumables, but also has a poor effect on optimizing the distribution of the flow field near the inlet of the heat exchanger. side, it is easy to cause swirling flow, resulting in vibration and wear of the tube bundle, which is not conducive to the stability and safety of equipment operation

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