In-situ monitoring device and method for corrosion depth of high-temperature alloy

Abstract

The invention provides a high-temperature alloy corrosion depth in-situ monitoring device and a high-temperature alloy corrosion depth in-situ monitoring method. The device is simple in structure and reasonable in design, meanwhile, the boiler pipe environment is simulated in real time, and in-situ monitoring of corrosion of the boiler pipe can be achieved. The device comprises a corrosion gas source, a quantitative injection container, a preheating furnace, a high-temperature reaction kettle and a tail gas treatment device which are sequentially connected, wherein a quartz tube is arranged in the high-temperature reaction kettle; two ends of the quartz tube are opened and are respectively provided with a vacuum electrode flange for sealing, the vacuum electrode flanges at two ends are respectively provided with a gas inlet, a gas outlet and a vacuum electrode, the gas inlet is connected with a gas conveying pipe preheated by a preheating furnace, and the gas outlet is connected with a tail gas treatment device through an exhaust pipe; the high-temperature alloy to-be-tested piece is fixed in the constant-temperature area of the quartz tube, two ends of the high-temperature alloy to-be-tested piece are connected with the vacuum electrodes on the inner sides of the vacuum electrode flanges through high-temperature-resistant wires, the vacuum electrode wires on the outer sides of the vacuum electrode flanges are connected with the digital microohm meter after being cooled by the cooling device, and the digital microohm meter is interactively connected with the data terminal.

Description

technical field [0001] The invention relates to the monitoring of boiler heating surface materials, in particular to an in-situ monitoring device and method for corrosion depth of high-temperature alloys. Background technique [0002] Boiler heating surface includes water wall, superheater, reheater and economizer, also known as "four tubes" of boiler; it is the key component responsible for recovering coal-fired flue gas energy, heating steam, and realizing energy conversion in the boiler. The corrosion suffered by the heating surface alloy of coal-fired boiler mainly comes from two aspects: one is the high-temperature steam oxidation corrosion on the inner side of the furnace tube, that is, the steam side; the other is the high-temperature soot / gas corrosion on the flue gas side outside the furnace tube. Power plant boiler superheaters, reheaters, steam pipes and other components often suffer from severe oxidation and shedding of inner walls during operation. For example,...

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Problems solved by technology

However, the laboratory test equipment that can effectively simulate the operating conditions of the boiler is still very limited, and considering the power generation efficiency of the power plant, it is difficult to carry out actual measurement experiments in the power plant

Many scientific research institutes at home and abroad have developed steam oxidation / flue gas corrosion test equipment, and from normal pressure to high pressure, from static corrosion to high temperature and high pressure dynamic corrosion gradually to super (super) critical conditions, but they cannot be corroded in situ Monitoring, that is, it is impossible to measure the corrosion and thinning of boiler tubes of different materials

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