Steam water-level high precision, high reliability electrode sensor

Abstract

The invention is a high-accuracy, high-reliability drum water level electrode type sensor for thermal parameter measurement of drum water level in a boiler, optimizing and improving the existing electrode type sensor. And it changes the water column immersed type steam cage heater into a water column built-in type; increases the height of the condensation chamber; designs a single-tube-type or thermal-sleeve-type water-side sampling tube; changes direct connection of water collection and draining devices into transitional and indirect connection and improves mechanical sealing performance of electrode components, and reduces electrode leakage ratio. And it improves thermal exchange strength between saturated steam and sampling water column, raising dynamic response speed of the sampling water column to boiler pressure variation and purifying the quality of the sampling water column.

Description

Technical field: [0001] The invention relates to the technical field of thermal measurement of boiler drum water level, in particular to sampling, sensing and measurement of steam drum water level in high-pressure, ultra-high pressure and subcritical boilers, and is an electrode-type sensor for steam drum water level. Background technique: [0002] Drum water level is the most important safety parameter for boiler operation. In order to monitor the water level accurately and timely, the industry has paid enough attention to the measurement of the water level of the steam drum for a long time. It is stipulated that an electrode water level gauge should be equipped, and it is required that the electrode water level gauge can eliminate the influence of the steam drum pressure in time, and measure the water level with high accuracy throughout the whole process. It can shut down the furnace accurately and safely. In the early 1990s, the applicant devoted himself to the research...

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Problems solved by technology

However, starting from the concept of keeping improving, the applicant feels that the patented product still has deficiencies, for example: the structure of the steam cage heater used is still relatively complicated, which increases the difficulty of making the whole machine; and the outer part of the heater The temperature of the water sample is still low, which will inevitably affect the sampling accuracy; and when the water level of the steam drum rises rapidly, that is, when the boiler is full of water, the cooler water in the sampling pipe on the water side enters the sensor cylinder, which affects the sampling dynamic response speed; in addition, for To prevent fatigue damage caused by instantaneous thermal stress concentration, the structure of the water collection and drainage device also needs to be improved, etc.

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