Integrated device and operation method for efficiency enhancement and antifreeze of photothermal assisted indirect air cooling tower

Abstract

The invention provides an integrated device and operation method for efficiency enhancement and antifreeze of a photothermal assisted indirect air cooling tower, which includes a multi-flow transparent air duct with a heat storage medium inside, the outlet of which is connected to the inlet of a tapered pipe, and the outlet of the tapered pipe passes through The connecting pipe is connected to the inlet of the air supply pipe. The air supply pipe includes two air outlet branches. The first air outlet is located inside the indirect air cooling tower, close to the inner wall of the indirect air cooling tower, and the air outlet direction is obliquely upward. The second air outlet is located in the air cooling cooling tower. Above the triangular area formed by the device and the louvers, the air outlet direction is vertically downward; it also includes a first temperature sensor, a second temperature sensor and a third temperature sensor, respectively measuring the air temperature T inside the indirect air cooling tower a1 , Air temperature T at the air inlet of the air-cooled radiator a2 , The air temperature T before the bifurcation of the two outlet branch pipes of the air supply duct a3 . The invention can not only improve the cooling capacity of the indirect air-cooling tower under the summer working condition, but also reduce the antifreezing pressure of the radiator of the indirect air-cooling tower under the winter working condition.

Description

technical field [0001] The invention relates to the technical field of indirect air cooling, in particular to an integrated device and operation method for efficiency enhancement and antifreezing of a photothermal assisted indirect air cooling tower. Background technique [0002] Indirect air cooling technology has been widely used in thermal power units in my country's coal-rich and water-poor areas because of its significant water-saving benefits. The core equipment of indirect air cooling technology is the indirect air cooling tower and numerous air cooling radiators (also known as cooling triangles) arranged at the bottom of the tower. The circulating water absorbs the waste heat of the exhausted steam from the condenser and is transported by the circulating water pump to the radiator at the bottom of the indirect air-cooling tower. When the ambient air flows through the radiator, it conducts surface heat exchange with the internal circulating water and then heats up. At...

AI Technical Summary

Problems solved by technology

[0003] When the ambient temperature rises, the heat transfer temperature difference of the air-cooled radiator decreases, and the cooling capacity of the air-cooling tower decreases, resulting in an increase in the back pressure of the unit. Therefore, the indirect air-cooled unit often operates with high back pressure in summer, and the unit is under extreme high temperature and occasional strong wind conditions. Back pressure can also exceed a critical value, causing unit load limitation

Under low temperature conditions in winter, the cooling capacity of the indirect air-cooling tower is often excessive, causing the radiator to face severe antifreeze pressure. On the one hand, the indirect air-cooling tower mostly uses thin-sheet aluminum radiators with excellent heat transfer performance, and its antifreeze ability itself is poor; On the other hand, the common air leakage effect at the bottom of the indirect air-cooling tower will still lead the radiator to continue to dissipate heat to the environment after all the shutters are closed.

Once the radiator is frozen, the freezing point will spread rapidly, which will not only damage the equipment, but also cause unplanned shutdown of the unit, resulting in huge economic losses

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