Boiler energy efficiency test is an important part of boiler energy-saving work, and organic heat carrier boiler is an important part of China's industrial boilers. Especially in areas where printing, dyeing, chemical, textile and other industries are developed, organic heat carrier boilers have a larger proportion. The key to the energy efficiency test of organic heat carrier boiler is to accurately measure the flow rate of high temperature heat transfer medium (high temperature heat transfer oil, boiler feed water, dissolved salt). The high temperature ultrasonic flowmeter detection technology can be used to measure the organic heat carrier boiler without cutting off the process pipeline. High temperature medium flow.
In the energy efficiency test, since the temperature of the high temperature heat transfer oil is usually between 250 and 320 degrees, the measurement of the flow rate is always a difficult point. Conventional flow meters such as turbines and vortex flowmeters generate pressure loss during testing, and the measurable temperature is generally around 120 degrees, which is a measure that cannot meet the high-temperature boiler flow.
Configuration requirements for ultrasonic flowmeters in industrial boiler energy efficiency tests:
(1) Ability to 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) Flow rate range: 0.01-25m/s
(5) Resolution: 0.00025m/s
Senyi intelligent instrument introduced German FLEXIM high-temperature ultrasonic flowmeter to measure the influence of medium on two-way acoustic signal by time difference measurement method to determine the flow velocity of medium. At the same time, high-temperature waveguide with special sensor can measure the flow of high-temperature medium within 400 degrees. Calculated, solved an important test difficulty. And it is easy to install, small in maintenance, can be used for the measurement of all sound-conducting liquid flow, and is a reliable organic heat carrier boiler medium flow measuring instrument.
In the specific boiler energy efficiency test, the FLEXIM high-temperature ultrasonic flowmeter is composed of a main machine, a high-temperature waveguide (consisting of a metal wave guide plate, a sensor fixture, a pipe clamp, an acoustic coupling piece), and a sensor. It uses a unique dual UP technology and automatic adaptive signal processing technology. By using a high temperature waveguide, the waveguide transmits the sensor signal to the tube wall. At the same time, the cooling effect of the waveguide causes the surface between the sensor and the surface of the pipe to be generated. A temperature difference effectively blocks heat transfer and protects the sensor from high temperatures, thus meeting the high temperature requirements of flow measurement.
The parameters that should be noted during field measurement:
(1) The sound velocity of the medium has a great relationship with the temperature. According to the normal operating temperature and the speed of the heat medium, the estimated interval is 700-800 m/s. When the system is commissioned, the sensor spacing needs to be re-adjusted to obtain an accurate media sound velocity.
(2) The organic heat carrier is non-corrosive to the metal pipe, the pipe is generally not lined, and the roughness is usually evaluated in combination with the service life of the pipe, usually 0.05-0.1 mm;
(3) There may be deviation between the design wall thickness of the pipeline and the actual wall thickness. Before the instrument parameters are set, multi-point measurement should be made on the wall thickness and outer diameter of the pipeline to ensure the accuracy of parameter setting.
Ningxia Xinshuncheng Special Alloy Co., Ltd. , http://www.xinshunchengalloy.com