Online leak detection device for steam trap of steaming-water pipeline of thermal power plant

Abstract

The invention relates to an online leak detection device for a steam trap of a steaming-water pipeline of a thermal power plant. The online leak detection device is composed of digital temperature sensors, a digital temperature signal collector, a 485 communication cable, an optical modem, an optical cable and a data processing computer, wherein the digital temperature sensors adopt DS18B20, and a plurality of digital temperature sensors arranged in the circumferential direction of the outer side of the downstream drain water pipeline of the same steam trap share one digital temperature signal collector; the digital temperature signal collector adopts a microprocessor ARM7, and collected signals are transmitted to the data processing computer through a data communication line to be processed; and according to the data of the downstream wall surface temperature of the steam trap and the rate of change of the data, a principle of fuzzy pattern recognition is adopted to carry out fuzzy recognition on the leakage level of the steam trap. The online leak detection device has the advantages of simple system and convenience for installation and maintenance, can monitor on line in real time, and accurately judges the leakage of the steam trap in time.

Description

technical field [0001] The invention relates to an online real-time leak detection device for a steam-water pipeline trap in a thermal power plant, belonging to the detection technical field. Background technique [0002] Steam will inevitably lose heat during pipeline transmission. When its temperature drops to the saturation temperature, it will start to condense and form condensed water, that is, drain. Water impact on steam pipelines, causing damage to pipelines and equipment. At the same time, the water in the drain pipe is recycled through the drain system, which also avoids the loss of part of the working fluid and heat. [0003] A certain number of drain pipes are usually arranged on the steam pipes of thermal power plants, and at least one drain valve is installed on each drain pipe. The discharge of drain can be controlled by opening and closing the drain valve. During the start-up phase of the unit, the drain valves should be opened. At this time, a large amount...

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Problems solved by technology

For high-temperature and high-pressure pipelines, the temperature detection elements used in this method need to withstand high-temperature environments. From the perspective of safety, the temperature measurement points must be installed before the unit starts, otherwise after the unit is running, the steam parameters in the pipe will rise. There are more restrictions on its installation and use

[0010] When the above method is used for on-line detection of equipment, special equipment is required to convert the measured analog signal into a digital signal (that is, A / D conversion), the system is complex and the equipment investment is large

Considering the large number of steam traps in thermal power plants and the complex spatial distribution, the above-mentioned detection methods have problems such as complex systems, large investment in detection equipment, and high energy consumption.

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