The treatment method for the large fluctuation range of the measured value of the coal slurry flow

Abstract: The information on the processing method of the large fluctuation range of the measurement value of the coal slurry flow rate is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. In practical applications, regarding the application of electromagnetic flowmeters in Texaco process coal-water slurry, there are usually some misunderstandings in the selection and application of relevant technicians [7-8]. It is now summarized as follows. ①The wear of coal slurry is large, so wear-resistant ones are used. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the treatment method for the large fluctuation of the measured value of coal slurry flow. In practical applications, regarding the application of electromagnetic flowmeters in Texaco process coal-water slurry, there are usually some misunderstandings in the selection and application of relevant technicians [7-8]. It is now summarized as follows. ①“The wear of coal slurry is large, so wear-resistant ETFE lining is used”The point of view is not accurate, ETFE mainly solves the problem of adhesion to metal. Although the raw material of ETFE is cheap, its current processing technology is complicated. The cost of using it to make linings is higher than that of PFA, and there is no evidence that the wear resistance of ETFE is better than that of PTFE. The sensors produced by Shanghai Welltech are lined with hard rubber and have been used effectively on site for three years, and no obvious wear has been found. ②“Low-noise electrodes are used, so the fluctuation is small”view is inaccurate. The shape of the electrodes does correlate with the magnitude of the noise. Since the electrode of the original imported flowmeter has scaling phenomenon in a coal chemical enterprise, it is often necessary to remove the flowmeter and polish the electrode with crystalline sandpaper. fouling problem. The practical application shows that although the smoothness of the self-cleaning electrode flowmeter is slightly worse than that of the spherical electrode, there is no abnormal fluctuation. Therefore, we believe that low-noise electrodes are not the key technology in solving the abnormal fluctuation of coal propeller flow output. ③“The original imported flowmeter has low installation requirements,‘Front 5D back 2D’just fine”view is inaccurate. In the laboratory calibration, the straight pipe section is required to be relatively long (up to 10D); in applications, generally“5D before 3D”Enough is enough, this is not just for inlet flow meters. If the diameter is reduced, the requirements for straight pipe sections can be further reduced. In addition, the current coal slurry flowmeter is basically not used for closed-loop control, and the requirements for accuracy are not very high. The key is to ensure that the safety interlock is in an effective state to avoid abnormal fluctuations. ④“The flow rate of the original inlet flowmeter has little effect on the flow rate, and is suitable for a flow rate of 0.3m/s”view is inaccurate. This statement is very misleading. Practical application experience shows that when the flow rate is low, especially when the flow rate is lower than 0.5m/s, the coal slurry flowmeter is easy to fluctuate. Therefore, this view is not accurate. ⑤“Simple diameter reduction”view is inaccurate. We used to reduce the diameter of the pipeline and install a smaller diameter flowmeter according to the reducing scheme of Shanghai Weiltai, but the actual use effect is not as good as the scheme proposed in this article. On the one hand, due to pipeline reconstruction, high-pressure flange and pressure vessel-level welding, the overall cost is not low; on the other hand, if the diameter of the pipeline is reduced, the length of the small diameter will be much larger than that of the flowmeter, resulting in an increase in pressure loss. large, and the converter is not replaced, many results are unpredictable. ⑥“The original imported flowmeter has less risk because of its high performance.”view is inaccurate. High performance and good performance are two concepts, and there is no cause and effect between them. Due to historical reasons, the market share of the original imported flowmeter is relatively high. Although there are many good performances, there are also poor performances. Once the fluctuations cause a false jump, the loss is very large. According to incomplete statistics, the loss of a 200,000t methanol production line is about 300,000 yuan due to the fluctuation of the coal slurry flowmeter, and the loss of a 600,000t methanol production line is about 800,000 yuan. This is also one of the reasons why the price of high-quality coal slurry flow meters remains high. We have used two brands of imported flowmeters, and there have been cases where they broke in eight months, and three sets of flowmeters broke down in one year. The solution provided by Shanghai Welltech has carried out a number of targeted designs according to the special working conditions of the Texaco gasifier, and it has been used safely and reliably for more than three years. In summary, we believe that the appropriate choice is the best choice for practical applications. In the measurement application of coal slurry flow in Texaco gasifier, the source of coal and the formulation of coal slurry are not the same due to the complex fluid parameters involved in the flow state of the flow field. Therefore, the application effects of different coal slurry flow meters are also quite different. The same kind of flowmeter is prone to fluctuations in some occasions, but the application effect is better in other occasions, which is caused by the insufficient stable working range of the selected coal slurry flowmeter. In order to minimize or avoid accidental trips and ensure that the safety interlock is in an effective state, a coal slurry flowmeter with a wider stable working range should be selected, and a stable and fast coal slurry flowmeter should be selected to meet the basic requirements of the process. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Processing Method for Large Fluctuation of Coal Slurry Flow Metered Value'

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