Coupling intelligent control system of cold flue gas recirculation system and its construction method

Abstract

The invention discloses a coupled intelligent control system of a cold flue gas recirculation system and a construction method thereof. The system includes: a data acquisition layer for collecting the operating state data of the boiler and the operating state data of the cold flue gas recirculation system; The processing layer is used to filter the operating status data sent by the data acquisition layer, eliminate the pathological data, and extract the feature quantity; the execution module selection layer is used to perform calculations based on the data processed by the mathematical model and the data processing layer , and make real-time adjustments to the primary circulation volume and secondary circulation volume of the cold flue gas according to the operation results, so that the boiler operates in the best state during the deep peak shaving period; the result output layer is used to perform result output for the intelligent control system, important The output of operating data and abnormal alarm output to guide and remind the operator of the operation. The invention realizes the intelligent adjustment of cold flue gas recirculation, and effectively improves the deep peak-shaving capability of the boiler.

Description

technical field [0001] The invention relates to a coupling intelligent control system of a cold flue gas recirculation system and a construction method thereof, belonging to the technical field of power generation equipment. Background technique [0002] my country's power grid is presenting some new features-the capacity of the power grid is increasing rapidly, UHV and DC transmission are completed and put into operation, and the proportion of new energy is rapidly increasing. The provincial grid needs to explain that renewable energy The power generation of renewable energy has intermittent characteristics. On the other hand, the power consumption structure at the user end has changed significantly, and the proportion of residential electricity consumption has increased, and the proportion of industrial electricity consumption has decreased. The above two forms make the peak-to-valley difference of power grid load show an increasing trend, which is more obvious in some reg...

AI Technical Summary

Problems solved by technology

Therefore, a power plant explores the use of cold flue gas recirculation technology to improve the deep peak-shaving capability of the boiler, and divides the cold flue gas into two paths: primary cold flue gas recirculation and secondary cold flue gas recirculation. The primary cold flue gas recirculation is The cold flue gas is boosted and sent to the position before the outlet of the primary fan enters the air preheater, and the secondary cold flue gas is recirculated to the place where the cold flue gas is boosted and sent to the outlet of the blower to enter the air preheater location, the booster fan for the primary cold flue gas and the booster fan for the secondary cold flue gas use variable frequency fans, so as to minimize the impact of the cold flue gas on the boiler, and it is also conducive to adjustment, because the cold flue gas recirculation can be simultaneously Increase the SCR inlet smoke temperature and reheat steam temperature to solve the two limited conditions of deep peak regulation at the same time. At the same time, when the high load is not needed, the cold flue gas recirculation can be cut off. At this time, the advantages of cold flue gas recirculation are: It will lead to an increase in the exhaust gas temperature, an increase in the power consumption rate of the factory, that is, a decrease in economy, and at the same time, it is necessary for the operator to accurately grasp the switching and adjustment of the input amount of cold flue gas recirculation according to the boiler status, which has high requirements for the operator.

[0005] From the above analysis, it can be seen that it is completely feasible for the cold flue gas recirculation to improve the deep peak shaving capability of the boiler technically, but it will have a negative impact on the economy, etc. At the same time, operators need to make more fine adjustments to the cold flue gas recirculation system , causing a certain pressure on the operators

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