Application of Wedge Flow Meter in Metallurgical Enterprise

Abstract: The application information of wedge flowmeter in metallurgical enterprises is provided by excellent flowmeter and flowmeter manufacturers. The wedge flowmeter is a differential pressure flowmeter. After using this product, it can be used satisfactorily in the measurement of high-viscosity liquids in chemical enterprises. From 1987 to 1988, a sewage treatment plant in the United States installed a total of 15 wedge-shaped flowmeters to measure the sewage flow, and the meters ran after they were put into operation. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the application article details of wedge flowmeters in metallurgical enterprises. Wedge-shaped flowmeter is a differential pressure flowmeter, and the use of this product is satisfactory in the measurement of high-viscosity liquids in chemical enterprises. From 1987 to 1988, a sewage treatment plant in the United States installed a total of 15 wedge-shaped flowmeters to measure the flow of sewage, and the meters ran normally after being put into operation. According to relevant foreign reports: a wedge-shaped flowmeter with a pipe diameter of 76.2mm contains 19% to 23% of solids in the measured liquid, and the viscosity reaches 680mPa·s, the Reynolds number is only 12 to 17, under such operating conditions, the measurement accuracy still reaches±2%, which is beyond the reach of other throttling devices. The orifice plate and electric target flowmeter used in the raw material flow detection of distillation residue, propane deasphalting, and ketone benzene dewaxing units in the refinery of Dushanzi Petrochemical General Plant in my country have not been used well. good results. Measurement principle Wedge flowmeter is based on Bernoulli's formula, using the fluid to obey the law of conservation of energy during the flow process, that is, the sum of kinetic energy and static pressure energy is unchanged, and the pressure is generated when the fluid passes through the circular wedge-shaped block that acts as a throttling. The principle of poor flow measurement is carried out. The wedge-shaped flow orifice plate is made of two flat plates (usually stainless steel), which are welded together at the critical angle, and then inserted into the groove. When the fluid flows through the V-shaped throttling block, the flow area decreases, the flow velocity increases, and the static pressure decreases, resulting in a static pressure difference. Since the square root of the pressure difference is proportional to the flow rate, the flow rate in the pipeline can be obtained by measuring the pressure difference. Structure and basic features 1. Basic structure of wedge-shaped flowmeter The structure of the wedge-shaped flowmeter is simple, and its structure (see Figure 2) is between the circular orifice plate, the nozzle and the 1/4 circular orifice plate, taking into account the above forms While the advantages of the flowmeter, it also has good adaptability. 2. Main features (1) Dirty fluids are easy to pass through, and the dirt is not easy to adhere and deposit, which improves the accuracy of measurement and prolongs the use and maintenance cycle. It is suitable for the measurement of various media such as metallurgy, chemical industry, and environmental protection. (2) The requirement for the sharpness of the entrance of the orifice plate is improved, and the measurement accuracy is improved. (3) It is suitable for high viscosity medium and widely used. (4) The range ratio is wide, usually up to 10:1 or more; the measurement accuracy is high, up to±(0.5～1)% FS. (5) The pressure loss is smaller than that of the wedge-shaped orifice plate, and the included angle is generally 60°~90°. If the included angle is 0°, that is, a circular hole plate. The smaller the included angle, the larger the static pressure difference and the corresponding increase in pressure loss. Because the wedge-shaped orifice plate is an inverted triangle, this shape has a diversion effect, and the fluid can smoothly transition when flowing. The wedge-shaped orifice plate produces less pressure loss than the orifice plate. Comparison of pressure losses for wedge-shaped orifice plate and orifice plate. (6) The wedge-shaped orifice plate has the advantage of a round orifice plate. When the fluid contains impurities or solids, it is easy to flow through the lower part of the wedge-shaped orifice plate and will not deposit around the orifice plate, that is, the wedge-shaped orifice plate has a self-cleaning effect. (7) Suitable for low Reynolds number RD flow measurement standard orifice plate, Venturi tube, etc. should not be measured at low Reynolds number. The flow coefficient of the standard orifice plate usually tends to be stable when the Reynolds number is above 4000, and when the Reynolds number is low, the flow coefficient changes with the change of the Reynolds number. When the Reynolds number is less than 1800, the flow and differential pressure will deviate from the basic square root relationship, which obviously has a great impact on the measurement accuracy. The wedge-shaped orifice plate is a V-shaped throttling element with good linearity of the flow coefficient, and has the characteristics of a smooth curve at the nozzle inlet and no stagnation area, and the Reynolds number has little influence on it. When the Reynolds number is as small as 500, the accuracy and flow coefficient of the wedge flowmeter do not change much; when the Reynolds number is between 400 and 10000 for flow measurement, the error is less than±3%, the curve of Reynolds number and flow coefficient of the wedge-shaped orifice plate. (8) Easy to install and use Compared with the orifice plate, both ends of the wedge-shaped flowmeter can be connected with the process pipeline by flanges, which is convenient for installation, small in daily maintenance and operation cost. relatively cheap. Application of wedge flowmeter The wedge flowmeter has a wide range ratio, and the applicable range of Reynolds number is between 300 and 106, so it is especially suitable for the measurement of high-viscosity fluids, such as various high-viscosity fluids and sewage in chemical plants; more dirty gases, Such as blast furnace gas, coke oven gas measurement; steam, natural gas and other gases can also be measured. Examples of practical applications are as follows: (1) The measurement of industrial naphthalene primary tower circulation flow, refining tower circulation, initial tower raw material, refining tower raw material, first-stage and second-stage tar measurement in the heavy steel coking plant has been using target flowmeters in the past, and the use effect is not good good. The plant first tried to use a wedge-shaped flowmeter for flow detection on the circulating flow of the industrial naphthalene primary tower, and the practice showed that its operation was stable and reliable.

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