Application of precession vortex gas flowmeter in cement industry

In the chemical industry, petrochemical, steel, power, heating and water treatment industries, various flowmeter applications are very common, used to measure the flow of various liquids and gases. With the increasing demand for flow measurement in the industrial field, various new flowmeters on the market are no longer new. They have different modified terms according to the measurement mechanism, such as Coriolis, ultrasonic, electromagnetic, and vortex flowmeters. Compared with traditional volumetric, venturi, and mechanical orifice flowmeters, the new flowmeters are more novel. The characteristics of it are significantly different from the old-style flowmeter in terms of accuracy, reliability, repeatability, and maintainability. In these devices, there are few or no moving parts that are easy to wear; most of the flowmeters are non-invasive components, which have a smaller pressure drop and better safety; many meters are equipped with microprocessors that can perform Self-diagnosis and other functions, which can provide users with real-time feedback and historical data collection.

Compared with other industries, various flow meters are rarely used in the cement industry. This is because the main medium in the production process is the material flow and the air flow, and the material flow is mainly powder and particles. In the main process flow, the liquid material There is almost no flow, and the air flow still carries a certain amount of dust, and it passes through a large pipe, which brings great difficulty to the flow measurement. Although at some process points such as the air volume of each room of the cooler, because the high-pressure air flow is measured, the diameter of the pipe is not large. Generally, a traditional Venturi tube can be used to measure through the differential pressure, but due to the low measurement accuracy, The flow value can only be used as a reference, and it is used to adjust the opening of the damper. Constant air volume is also difficult. At present, some 5000t / d do not measure the flow of high-pressure air, but estimate the flow by measuring the electrical power output of the high-pressure roots fan . Therefore, flow measurement was almost a blank in the cement industry in the past, and automation technicians often only knew temperature, pressure, level and other measurement sensors. With the increase in the scale of cement production and the continuous updating of the process, flow measurement and new flow meters have also begun to be applied in the cement industry, manifested in the following aspects:

1. Measurement of gas flow in large pipelines

In the early introduction of some dry process cement production lines, foreign companies proposed to detect the gas flow at the exit of the kiln and in the large pipeline for waste gas treatment and adjust the relevant valves accordingly. I used the through-hole plate type flowmeter and flute-shaped uniform velocity tube flowmeter. However, it is too difficult to use, because the flow measurement does not affect the production of cement, and has not been used since. With the continuous updating of cement technology and scale, large-scale vertical mills have been widely used. In the process flow of vertical mills, it is required to measure the air volume of the import and export of the mill and keep the circulating air volume constant, such as the 3300t / d cement production line exported to Oman in China. The vertical mill of the extraordinary company is used, which is required in the list of measuring points. The diameter of the outlet duct of the raw mill of the 3000t / d cement production line is generally about 800mm. In the flow measurement specification, the pipe diameter greater than 200mm is a large-diameter flow measurement. For example, with a traditional orifice-type flowmeter, in operation, due to the sharp edge of the orifice orifice wear, the surface of the plate is contaminated, the pipeline accumulates condensed dust It needs to be replaced after being worn; orifice flowmeters also have shortcomings such as small range ratio, low accuracy, and large irrecoverable pressure loss; for large-diameter pipelines, large flanges are required, and their price, installation cost, and maintenance are also a Issues worthy of attention. In addition, the gas flow measurement is subject to changes in temperature and pressure. It will have a serious impact on the gas flow measurement, mainly in terms of accuracy and repeatability; in the cement industry, most of the measured process gas contains dust, measurement sensors There are generally small holes in the middle, and the dust will easily cause the blocking of the measurement sensor. Therefore, it is difficult to measure the gas flow of the large pipeline in the cement industry, and there are many problems to be solved.

With the emergence of a new type of differential pressure equalizing tube flowmeter, the problem of measuring the gas flow of large pipelines has been solved. It has the characteristics of large range ratio, high accuracy, and small non-recoverable pressure loss. It can also be prevented by various measures. The dust in the gas clogs the measuring sensor. This article will focus on the working principle, basic structure, performance characteristics and applications of the new differential pressure equalizing tube flowmeter.

2. The measuring mechanism of the precession vortex gas flowmeter is used for material measurement

In the cement process, the raw materials, intermediate products and final products are all solid, and mainly granular and powder materials. The flow measurement of these materials in the cement factory is achieved by electronic belt scales and various solid flow meters. The process equipment is also automatic equipment, but it is not a flow meter. In recent years, some foreign companies have used the measurement mechanism of new flow meters such as Coriolis and ultrasonics for measuring scales. The most typical example is the Coriolis scale developed by the German Schenck company using the mechanism of Coriolis force to measure the quality of fluids. It is used to measure coal powder. Compared with other coal powder measurement scales, it has a simple structure and control accuracy. The characteristics of high, integration of metering and transportation are now widely used in China's cement industry. Some domestic companies also use measuring scales developed by Coriolis, but the indicators in many aspects are not as good as Schenck's products.

3. Adopt new flowmeter in auxiliary process and low temperature waste heat power generation

The auxiliary process in the cement industry is mainly used to improve equipment operation rate and protect equipment. For example, the humidification and water spraying in the exhaust gas treatment process is to increase the specific resistance of the dust, thereby improving the efficiency of the electric dust collector. The new dry process cement plants are equipped with automatic water injection control loops. In the water volume control, electromagnetic flow meters are installed in each plant, and some are also equipped with bundled ultrasonic flow meters, which play a good monitoring role and also make the water spray The auto-regulation loop can operate normally.

The cement industry has generally used low-temperature waste heat from waste gas to generate electricity, and many new flowmeters have been used in waste heat power generation systems, such as ultrasound and vortex.

3. Conclusion

With the increase in the scale of cement production and the continuous updating of the process, the precession vortex gas flow meter has also begun to be applied in the cement industry, and the development trend is optimistic. If it is used as an adjustment and monitoring in the automation system of a cement plant, the measurement of the gas flow of a large pipeline can be the first choice of the differential pressure equalizer tube flowmeter. As the large pipeline gas in the cement process contains dust, be sure to determine the "tailor-made" and each detail of the direct installation with the differential pressure equalizing tube manufacturer when selecting, and some necessary accessories must be determined in the order.

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