Method for determining optimal backpressure of direct air cooling unit

Abstract

The invention discloses a method for determining optimal backpressure of a direct air cooling unit, and the method comprises the steps: combining mechanism analysis with historical data, and determining the final-stage exhaust steam specific enthalpy value of a steam turbine based on historical operation data in combination with a particle swarm optimization (PSO) and XGBoost (eXtreme Graphic Boost, XGBoost) combined algorithm; calculating the micro-increasing power characteristic of the unit by adopting an equivalent enthalpy drop method; and calculating the power consumption of a fan by combining the frequency conversion characteristic of an air-cooling fan, and when the difference between the final-stage exhaust steam specific enthalpy value and the power consumption is the maximum, obtaining the optimal back pressure of the unit under the working condition. According to the method for determining the optimal backpressure of the unit, the optimal backpressure value of the unit under multiple working conditions can be provided, energy-saving optimal operation of the cold end of the air cooling unit can be achieved in an auxiliary mode, and the energy-saving potential of the direct air cooling unit can be deeply excavated.

Description

technical field [0001] The invention relates to the technical field of thermal equipment data prediction, in particular to a method for determining the optimal back pressure of a direct air-cooling unit. Background technique [0002] The operating back pressure of the direct air-cooled unit is one of the key parameters for the energy-saving operation of the unit. Although reducing the back pressure can increase the generating power of the unit, it will also increase the power consumption of the air-cooled island fan. Therefore, to determine the optimal back pressure of the unit, a balance should be sought between the increase in the generating power of the unit and the increase in the power consumption of the air-cooling fan. At the same time, the back pressure of the direct air-cooled unit will be affected by multiple boundary conditions such as unit load, oncoming wind speed, and ambient temperature, and will show different characteristics under different operating conditi...

AI Technical Summary

Problems solved by technology

However, due to the influence of online measurement conditions, the exhaust enthalpy of the unit cannot be directly obtained. Most of the existing research methods consider that the exhaust steam at the final stage of the unit is saturated wet steam, but such a simplified assumption will affect the accuracy of the model. The optimal back pressure is a theoretical value, subject to certain restrictions in engineering applications

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