Boiler energy efficiency test is an important part of boiler energy-saving work, and organic heat carrier boiler is also an important part of China's industrial boilers, especially in areas with developed industries such as printing and dyeing, chemical industry, and textile, organic heat carrier boilers account for a larger proportion. The key to the energy efficiency test of the organic heat carrier boiler is to accurately measure the flow rate of the high-temperature heat-conducting medium (high-temperature heat-conducting oil, boiler feed water, and dissolved salt). The high-temperature ultrasonic flowmeter detection technology can measure the organic heat carrier boiler without cutting the process pipeline High temperature medium flow.
In the energy efficiency test, since the temperature of the high-temperature thermal oil is usually 250-320 degrees, the measurement of the flow rate is always a difficult point. Normal flowmeters such as turbines and vortex flowmeters will produce pressure loss during testing, and the measurable temperature is generally around 120 degrees, which is unable to meet the measurement of high-temperature boiler flow.
Requirements for the configuration of ultrasonic flowmeters in energy efficiency testing of industrial boilers:
(1) It can complete the flow test of the pipe diameter range DN10-DN400;
(2) The accuracy is not less than 0.5%;
(3) Temperature measurement range: 0-200 degrees;
(4) Velocity range: 0.01-25m / s
(5) Resolution: 0.0025m / s
The German FLEXIM high temperature ultrasonic flowmeter measures the influence of the medium on the bidirectional sound wave signal by the time difference measurement method to determine the flow rate of the medium. At the same time, the high temperature wave guide is used with a special sensor to measure the high temperature medium within 400 degrees. Difficulties in important testing. And it is easy to install, small maintenance, can be used to measure the flow of all sound-guiding liquid, is a reliable organic heat carrier boiler medium flow measurement instrument.
In the specific boiler energy efficiency test, the FLEXIM high-temperature ultrasonic flowmeter is composed of a host, a high-temperature wave guide (consisting of a metal wave guide plate, a sensor fixture, a pipe fixture, and an acoustic coupling sheet) and a sensor. It uses unique dual-UP technology and automatic adaptive signal processing technology. By using a high-temperature wave guide, the wave guide plate transmits the sensor person signal to the pipe wall. At the same time, the cooling effect of the wave guide plate causes the surface of the sensor to be generated between the pipe surface A temperature difference effectively blocks heat transfer and protects the sensor from high temperatures, thus meeting the high temperature requirements of flow measurement.
Problems that should be paid attention to when setting parameters during on-site measurement:
(1) The sound velocity of the medium has a great relationship with the temperature. According to the estimated operating temperature and sound velocity of the heat transfer medium, the English interval is set to 700-800m / s. When the system is debugged, the sensor spacing needs to be readjusted to obtain the accurate medium sound velocity;
(2) The organic heat carrier is not corrosive to metal pipelines, and the pipelines are generally not lined, and the roughness is usually evaluated in conjunction with the service life of the pipeline, usually 0.05-0.1mm;
(3) The design wall thickness of the pipeline may deviate from the actual wall thickness. Before setting the instrument parameters, the wall thickness and outer diameter of the pipeline should be measured at multiple points to ensure the accuracy of the parameter settings.
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