A power plant boiler waste heat utilization system with intelligent control of fan frequency

Abstract

The invention provides a power station boiler residual heat utilization system capable of achieving intelligent control for fan frequency. The system comprises a boiler, a main flue, a bypass flue, a heat exchanger, a flue temperature sensor and a central controller, wherein smoke generated by the boiler enters into the heat exchanger through an inlet of the bypass flue; smoke subjected to heat exchange flows into the main flue via the outlet of the bypass flue and then is discharged; a main flue fan is arranged on the main flue; a bypass flue fan is arranged on the bypass flue; the flue temperature sensor measures the temperature of discharged smoke; the central controller is in data connection with the temperature sensor, the main flue fan and the bypass flue fan; the central controller automatically adjusts the frequency of the main flue fan and the bypass flue fan according to the exhaust gas temperature measured by the temperature sensor. According to the power station boiler residual heat utilization system, the exhaust gas temperature of smoke is automatically controlled through intelligently controlling fan frequency to adjust flow of smoke participating in residual heat utilization and heat exchange, so that low-temperature corrosion is avoided, and intelligentized adjustment of the system is realized.

Description

technical field [0001] The invention belongs to the field of steam boilers, in particular to the field of waste heat utilization of steam boilers. Background technique [0002] With the rapid development of my country's economy, energy consumption is increasing day by day, and the problem of deteriorating urban air quality is becoming more and more prominent. It is urgent to save energy and reduce the emission of harmful environmental substances. In the common steam generation process, one of the main reasons for high energy consumption and serious pollution is that the exhaust temperature of boiler flue gas is too high, which wastes a lot of energy. Therefore, the waste heat of boiler exhaust gas is recovered and reused to achieve energy saving and emission reduction. purpose, while protecting the environment. However, in the prior art, low-temperature corrosion may occur while satisfying the residual heat of the flue gas, so how to avoid low-temperature corrosion is an im...

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Problems solved by technology

However, in the prior art, low-temperature corrosion may occur while satisfying the residual heat of the flue gas, so how to avoid low-temperature corrosion is an important issue. At the same time, if only to avoid low-temperature corrosion, the waste heat in the flue gas is wasted Too much, leading to the problem of poor utilization of waste heat, so the above-mentioned related problems need to be solved urgently

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