Vortex flowmeter measures hot water flow and heat1

In the water supply system of the boiler, the normal temperature water first passes through the economizer to raise the water temperature to 105~140°C, and then sends it into the boiler. In the urban heating system, hot water is the main heat carrier. According to different uses, the water supply temperature is divided into several grades of 60°C, 90°C, and 130°C. Both of the above two systems require measuring the flow of hot water, but the purpose is different. The purpose of measuring the flow of hot water in the former is to control the water supply and water level of the boiler, the steam production and the safe water quality of the boiler; while the latter is to measure the quality of hot water. flow and heat. 2: Characteristics of hot water flow measurement (1) The temperature of hot water is not very high, and the maximum temperature does not exceed 140 ℃; (2) The cleanliness of hot water is high, and the water does not contain solid substances; (3) The water contains chloride ions , has a corrosive effect on ordinary steel, and as the water temperature rises, the corrosiveness increases; (4) The high pressure of hot water used in the heating system is 1MPa, while the water pressure used for water is relatively high, about several trillion (5) The diameter of the pipe varies from 50 to 300mm for the boiler water supply pipe; the pipe diameter of the heating system is quite different, the small pipe diameter is 20-40mm, and the large pipe diameter can reach l000mm. (6) The range is about 5:1~10:1. 3: Vortex flowmeters measure hot water flow. At present, instruments used for hot water flow measurement include orifice flowmeters, electromagnetic flowmeters, and vortex flowmeters. Using a vortex flowmeter to measure hot water has advantages over an orifice flowmeter in terms of pressure loss, accuracy and range. The pipe diameter of the boiler water supply is below 300mm, which is exactly the pipe diameter range of the full pipe vortex flowmeter. On the other hand, the vortex flowmeter can meet the above-mentioned characteristics of hot water flow measurement. Therefore, in recent years, the application of vortex flowmeters in this field has gradually increased. When using the vortex flowmeter to measure the water flow of the boiler, there are also problems that cannot be ignored, that is, the site environmental conditions are poor, the pipeline vibration, the noise and electromagnetic interference of various powerful power equipment around are relatively strong, so the installation should pay attention to the position. Choose, take vibration reduction measures, and strengthen shielding protection. When the meter is debugged on site, the sensitivity of the meter should be lowered appropriately. Hot water heating systems are mostly used for heating in winter in northern regions, so measuring the flow of hot water is an important part of heat measurement.

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