Electrode rod for detecting water-level, method of detecting water-level, and method of controlling water-level

Abstract

An insulating coating ( 6 ) formed of engineering plastic with high heat resistance, high-pressure resistance, and chemical resistance is formed on a surface of a water-level detecting electrode part ( 3 ) of an electrode rod for detecting water-level ( 1 ) attached to penetrate a metal container ( 5 ) communicating with a boiler ( 7 ) and including an external power supply connecting terminal part ( 2 ) projecting outside the container ( 5 ) and the water-level detecting electrode part ( 3 ) projecting inside the container ( 5 ). One side of a power supply ( 27 ) is connected to the external power supply connecting terminal part ( 2 ), and another side of the power supply ( 27 ) is connected to the container ( 5 ) for energization. An electrostatic capacity between the water-level detecting electrode part ( 3 ) and the container ( 5 ) is measured by using the insulating coating ( 6 ) formed on the surface of the water-level detecting electrode part ( 3 ) as a dielectric. The water-level of water to be brought into contact with the water-level detecting electrode part ( 3 ) in the container ( 5 ) can be detected from the electrostatic capacity. Proportional target water-level in the boiler ( 7 ) is set based on at least one of the burning capacity, vapor pressure, supply water temperature, and electrical conductivity of boiler water, and at least one of the burning capacity, vapor pressure, supply water temperature, and electrical conductivity of boiler water during operation of the boiler ( 7 ) is detected. A difference between the proportional target water-level to be specified by the detected values and actual water-level in the boiler ( 7 ) detected by the electrode rod for detecting water-level ( 1 ) is constantly calculated.

Description

technical field [0001] The present invention relates to a water level detection electrode rod installed in a metal container for detecting the water level in the container, a water level detection method using the water level detection electrode rod, a water level control method of a boiler, and a water level control method of a gas-water separator . Background technique [0002] When the steam generated in the boiler is heated and the bubbles generated in the water pipe of the boiler exceed the upper header, water is mixed in the generated steam, and the obtained steam is wet and poor in quality. of steam. In addition, when the bubbles generated in the water pipe do not reach the upper header, although there is no water mixed in the generated steam, the obtained steam is dry and high-quality steam, but the bubbles generated in the water pipe When the position is low and no bubble-based water film is formed on the upper header, since the water pipe is made of iron, the upp...

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Problems solved by technology

Therefore, if, for example, the water level of the gas-water separator is made to correspond to a state where the steam velocity is fast, the upper limit water level in the gas-water separator is set lower. The water level of the device is the upper limit water level, and the upper part of the water pipe or even the upper header is damaged due to the action of the flame.

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