Low-temperature economizer system with leakage detection function and control method

Abstract

The invention discloses a low-temperature economizer system with a leakage detection function and a control method. The system comprises a boiler body, a low-temperature economizer, a dust remover, aninduced draft fan, a desulfurizing tower, a chimney, a circulating water inlet pipeline, a circulating water outlet pipeline, a condensed water heater, a water tank, a water tank liquid level meter,a condensed water inlet pipeline, a condensed water outlet pipeline, a variable-frequency circulating pump and a variable-frequency booster pump, wherein the boiler body, the low-temperature economizer, the dust remover, the induced draft fan, the desulfurizing tower and the chimney communicate in sequence; circulating water inlets and circulating water outlets of the circulating water inlet pipeline, the low-temperature economizer, the circulating water outlet pipeline and the condensed water heater communicate in sequence; the water tank and the water tank liquid level meter are used for leakage detection; the condensed water inlet pipeline, the condensed water heater and the condensed water outlet pipeline communicate in sequence; the variable-frequency circulating pump is used for driving circulating water; the variable-frequency booster pump is used for driving condensed water, and temperature measuring points are arranged at a flue gas outlet and the circulating water inlet of the low-temperature economizer and remotely transmitted to a boiler centralized control system; and the variable-frequency circulating pump and the variable-frequency booster pump perform negative feedback regulation control through a set value and an actual value, a water tank liquid level alarm value is set, and an alarm is given when the water tank liquid level continuously descends. Leakage detection of the low-temperature economizer can be timely and reliably realized, and the reliability and economical property of the low-temperature economizer are improved.

Description

technical field [0001] The invention belongs to the technical field of boiler energy saving and environmental protection, and in particular relates to a low-temperature economizer system and a control method with a leak detection function, which can be used for leak detection of the low-temperature economizer. Background technique [0002] 2020 is the final year of the "Coal Power Energy Conservation and Emission Reduction Upgrade and Transformation Action Plan (2014-2020)". Most coal power units in my country have completed energy conservation and emission reduction upgrades, and low-temperature economizers are an important part of it. ring. The low-temperature economizer can not only recover the waste heat of the flue gas, but also improve the efficiency of the electrostatic precipitator and reduce the water consumption of the desulfurization tower. It has significant economic and environmental benefits and has been widely used. However, in recent years, many low-temperatu...

AI Technical Summary

Problems solved by technology

At present, there is no reliable and effective leak detection method for low-temperature economizers, and the research and development of related technologies is imminent

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