The gas mass flowmeter system was successfully put into operation on November 10, 2011. Under the condition of full-load production, the technical development department organized relevant personnel to conduct a comprehensive assessment of the liquid ammonia metering system from 0:00 on December 8 to 24:00 on December 16. The nine-day average ammonia production meter was 193.11t, the daily average ammonia consumption meter (the sum of FIQ-103 and FIQ-101 meters) was 188.30t, and the daily average ammonia stock was withdrawn (increased) by 4.82t (193.11-188.30=4.82 ), while the actual ammonia inventory was lifted 5.37t on average on the 9th day (this data is obtained by converting the height of the level gauge of the liquid ammonia storage tank. In the accumulation of long-term experience, the conversion method of the height of the liquid level gauge is basically reliable). Because the ammonia metering system is a closed system, and there is no way to use an instrument with a higher accuracy than the T-type flowmeter (dynamic ±0.2%) to individually test the metering accuracy of the flowmeter one by one. Therefore, the above comparison method had to be adopted. In contrast, the daily average liquid ammonia inventory meter data is smaller than the liquid level meter converted data. This shows that there are still problems in the liquid ammonia metering system: there is a bypass pipeline in the liquid ammonia production meter pipeline. It can be seen from the scene that there is a slight internal leakage in the bypass, and the liquid ammonia that leaks in the internal leakage is not measured by the meter. Therefore, it is credible that the daily average meter inventory is slightly smaller than the calculated amount of the liquid level gauge. After 9 days of actual assessment, the members of the assessment team agreed that the liquid ammonia metering system was running stably, and the mass flowmeter detection was accurate and reliable, which was in line with the actual production situation. On December 17, 2011, liquid ammonia measurement was officially included in the company's target cost assessment with meter data. So far, the liquid gas mass flowmeter has been put into operation for nearly 9 months, and the flowmeter has never had any failure. As a matter of fact, the ammonia meter used by Sokali was put into operation as early as the middle of May 1997, and it was also the first time we used a mass flow meter. It has been in use for nearly 6 years since it was put into operation in mid-May, 1997. The measurement is very accurate and no failure has occurred. Therefore, when the liquid ammonia metering system was perfected in 2001, two mass flowmeters were put into operation and it was also very successful. The above practice shows that it is correct to choose gas mass flowmeter for liquid ammonia measurement, and the system scheme is reasonable and feasible. The commissioning of the liquid ammonia metering system ended decades of history in which liquid ammonia production was measured by glass level gauges in liquid ammonia storage tanks. The conflicts and disputes caused by the apportionment of liquid ammonia measurement also reduced the workload and maintenance of the instrument, which was well received by all the cadres and employees of the company. The improvement of the liquid ammonia metering system has improved the scientific management level of the company.
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