Anti-corrosion device and method for heater drain system of heat-engine plant

Abstract

The invention relates to an anti-corrosion device and a method for a heater drain system of a heat-engine plant. The device comprises a heater and an ammonification pump, an oxygenation pump, a pH sensor and an online oxygen dissolving instrument which are communicated with the heater through a valve on a pipeline, wherein the ammonification pump and an ammonification system are connected, the oxygenation pump and an oxygenation system are connected, and the ammonification pump, the oxygenation pump, the pH sensor and the online oxygen dissolving instrument are all connected on a variable frequency speed regulation control cabinet. The innovation point of the device is as follows: a sensor for monitoring pH and the online oxygen dissolving instrument are installed behind the valve of the heater drain system, thus detecting the hydrophobic pH and oxygen concentration of the heater drain system in real time, and transmitting the hydrophobic pH and oxygen concentration to the variable frequency speed regulation control cabinet at real time so as to control the ammonification pump to add ammonia and oxygen into the hydrophobic system to regulate the pH to be about 9.0 and the oxygen concentration to be about 100mu g/L, being beneficial to maintaining a passive film in the drain system pipeline, and effectively inhibiting flow accelerated corrosion.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion of hydrophobic systems, and in particular relates to an anti-corrosion device and method for high / low addition of hydrophobic systems in thermal power plants. Background technique [0002] Flow-accelerated corrosion is a kind of corrosion caused by the influence of liquid flow, and it often occurs in local areas, especially in turbulent flow areas in strong reducing environments, such as pipe elbows, tees, variable diameters, thermal power plant drainage The system is the most complex and cumbersome system in a thermal power plant. There are many pipe elbows and valves. When the local water flow condition deteriorates, if there is no dense oxide film in the drain pipe to resist corrosion, it is easy to cause flow-accelerated corrosion. Thermal power plants can effectively prevent flow-accelerated corrosion by adopting the condition of adding oxygen to the feed water. However, when the steam...

AI Technical Summary

Problems solved by technology

In actual operation, a large part of the high iron content in the water vapor system of thermal power plants is caused by the corrosion of the heater's drain system. Therefore, no matter whether the feed water is oxygenated or not, there will be flow in the heater's drain system of the thermal power plant. risk of accelerated corrosion

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