Dynamic early warning method for growing of dirt of reclaimed water heat exchanger

Abstract

The invention discloses a dynamic early warning method for the growing of the dirt of a reclaimed water heat exchanger, and the method comprises three parts: 1, carrying out the fitting of a heat transfer criterion equation of two sides of the heat exchanger in a clean state through data sampling; 2, carrying out the plotting of a dirt thermal resistance increase characteristic curve through the collection of the data of the reclaimed water heat exchanger in one operation period, and building a dirt thermal resistance increase mathematical model; 3, carrying out the dirt growing early warning of the next period through employing the dirt thermal resistance increase characteristic curve and the dirt thermal resistance increase mathematical model, which are obtained in a former period, and carrying out online updating. The method can achieve the early warning of the growing of dirt, can achieve the online updating, provides decision making basis for the operation and maintenance of the heat exchanger through the early warning of the growing of dirt in the next period, and can enable the reclaimed water heat exchanger to operate in an energy-saving and efficient manner.

Description

technical field [0001] The invention belongs to the field of heating, ventilating and air-conditioning engineering, and in particular relates to a dynamic early warning method for dirt growth in a regenerated water heat exchanger. Background technique [0002] Reclaimed water refers to the water that can be used beneficially after the sewage has been properly treated and reached a certain water quality index. In the field of HVAC, heat exchangers are usually used to obtain heat or cold from reclaimed water to meet people's needs. However, due to the poor quality of the reclaimed water, the regenerated water heat exchanger is prone to fouling, which significantly deteriorates its heat transfer performance. In order to reduce the influence of fouling on the heat transfer performance of the reclaimed water heat exchanger, it is necessary to grasp the growth of the fouling in the reclaimed water heat exchanger, so as to clean and descale in time. [0003] At present, the monit...

AI Technical Summary

Problems solved by technology

Although this real-time on-line monitoring method can detect the thermal resistance value of dirt in real time and give an alarm for descaling, it does not have an early warning function and cannot realize early decision-making for operation and maintenance. When the alarm signal is issued, the thermal resistance of dirt has reached a high value , and the descaling process has hysteresis, which will greatly reduce the heat transfer performance of the heat exchanger, which is not conducive to the energy-saving and efficient operation of the heat exchanger

In addition, changes in parameters such as load rate and flow rate in actual operation will affect the heat transfer performance of the heat exchanger, and there will be some differences in the growth of fouling in each cycle, and the real-time online detection and calculation method cannot realize the accuracy of the calculation model. Online update may cause a large deviation between the calculated fouling growth thermal resistance and the actual value, resulting in misjudgment

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