Special flow meters for heat exchange stations from Shanghai Linxuan Instruments

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Special flow meters for heat exchange stations utilize the throttling effect created by a cone in the flow field to measure flow rate by detecting the pressure difference between the upstream and downstream areas. Compared to ordinary throttle elements, it changes the throttling layout, shifting from central-hole throttling to annular throttling. Practical use has shown that flow meters dedicated for heat exchange stations offer advantages over other flow meters, including high long-term accuracy and stability, minimal reliance on installation conditions, wear resistance, a wide measurement range, low pressure loss, and suitability for dirty media. Moreover, the cone itself acts as a flow field regulator, making it an excellent flow meter with unique properties. 1. The flow meter dedicated for heat exchange stations is a type of flow meter featuring high accuracy, high stability, a wide range, and the ability to measure a variety of media. 2. Measurable media include liquids, gases, vapors, etc., covering almost all fluid media. 3. The maximum operating temperature of the fluid can reach 800°C, and the maximum pressure can reach 10.5 Mpa. 4. If a case made of special materials is used, the operating temperature and pressure of the medium can be even higher. 5. The flow meters designed for heat exchange stations can measure Reynolds numbers as high as 5 million, and as low as 8,000 or even lower. 6. The full-scale differential pressure signal ranges from as low as 0.1 kPa to several tens of kPa. Quality 1: High accuracy: ±0.075%. 2. High stability: better than 0.1% fs/year. 3. High static pressure: 40 MPa. 4. No calibration is required after 5 years of continuous operation. 5. The effects of temperature and static pressure can be ignored. 6. Protection against overvoltage. Features: 1. It has good accuracy (≤0.5%) and repeatability (≤0.1%). 2. It has a wide range ratio (10:1 to 15:1). 3. Self-regulating function, requiring only a very short straight pipe section (1–3D at the front and 0–1D at the back). 4. Self-cleaning function; capable of detecting dirty and scaling-prone fluids, suitable for media with many impurities such as blast furnace gas. 5. Self-protection function: the critical parts of the throttle element do not wear out, ensuring long-term stable operation. 6. Resistant to high temperatures, high pressures, corrosion, and vibration. 7. The types of fluids that can be measured are very diverse (liquids, gases, vapors), and the flow measurement range is wide (from very low flows to high flows); it is suitable for pipes with a diameter ranging from DN15 to DN3000. 8. The structural design of the flow meter dedicated for heat exchange stations features a fluid-scanning design, which makes it impossible for it to retain any gas, liquid, or solid contaminants present in the fluid; thus, it is highly suitable for measuring the flow rate of dirty fluids such as coke oven gas and wet gases. 9. No moving parts. 10. When the fluid flows through the filled cone, a boundary layer is formed around it, guiding the fluid away from the edge of the cone’s tail and thereby reducing the likelihood of wear on that area. 11. When measuring steam and hot water at the heat exchange station, a straight pipe section is not required. Due to the limited space in the heat exchange station, conventional flowmeters require long straight sections, which affects operational efficiency; however, those used for measuring blast furnace gas have a self-cleaning function, and their pressure guide pipe are less prone to blockage. Parameters for the connected table body: 1. Nominal diameter: Φ15–Φ2000; Medium being measured: liquids, gases, steam. 2. Temperature range of the measured medium: –200°C to +800°C. 3. Pressure rating: 1.0MPa~10.5MPa. 4. Longitude grade: 0.5 grade, 1.0 grade, 1.5 grade, 2.5 grade. 5. Material of the table body: The material of the cone is stainless steel, while the pipes and flanges are made of carbon steel. (Supply under agreement for other materials). 6. β value range: 0.45……0.85.