2019年11月20日，操作人员郑寿兵、刘文斌在Y58幢硫酸氨基葡萄糖

On November 20, 2019, the operators Zheng Shoubing and Liu Wenbin dissolve anhydrous sodium sulfate in the R103 tank in the general production area of ​​Y58 glucosamine sulfate sodium chloride complex salt. After the steam was heated for a period of time, the steam valve was closed and the temperature was natural. After rising to 60.3 ℃ and stabilizing, the two went to weigh glucosamine hydrochloride. At 08:46 in the morning, they found that the steam valve had a “chirp” sound, and the temperature continued to rise to 61.2 ℃, which exceeded the dissolution temperature range (58 ~ 62 ℃) trend. <br><br>Because the steam valve is exposed to high temperature steam for a long time, the graphite PTFE gasket is damaged and deformed, resulting in a gap between the ball valve and the graphite PTFE gasket, steam leakage, and eventually the temperature rise. <br><br>1. The operator takes cooling measures in time and closes the steam main valve to keep the temperature within the process range. The heat preservation in the process is to fully dissolve the anhydrous sodium sulfate. Because the anhydrous sodium sulfate solution is stable, the maintenance personnel should replace the steam. After the valve, continue to feed, without affecting the quality of the product. 2. The Y58 steam main valve was closed at 8:50 on November 20, 2019, and opened at 9:26. The closing time lasted a total of 36 minutes. Building Y58 includes Y58-01 and Y58-02 production areas. During the Y58-02 production area, no steam was used and no other products were involved. Y58-01 Glucosamine Sulfate Sodium Chloride Compound Salt 9051-A191135 and 9051-A191136 are dried in a vacuum oven during the clean area. The temperature of the hot water tank of the baking material shows 55.6 ℃, within the scope of the baking process (50 ~ 60) ℃ , No need to heat up. Closing the steam main valve has no effect on product quality. 3. This year's equipment maintenance records were reviewed and checked, and no leaks were found in the steam valve. The steam valve is a long-term accessory. If there is steam leakage, it is easy to be found during daily inspections. The probability of such events is very small and the risk is controllable. <br><br>1. Replace the steam valve.

On November 20, 2019, operators Zheng Shoubing and Liu Wenbin dissolved the R103 can of sodium sulphate in the general production area of Y58 ammonia-based glucose chloride compound salt, and after a period of steam heating, close the steam valve to the temperature naturally rise to 60 After stabilizing at .3 degrees C, the two went to weigh amino glucosamine, at 08:46 a.m., found that the steam valve had a "snort" sound, and the temperature continued to rise to 61.2 degrees C, more than the dissolution temperature range (58 to 62 degrees C) trend. <br><br>Because the steam valve is monotone by the high steam temperature for a long time, resulting in the damage and deformation of graphite tetrafluorotherhepheds, resulting in a gap between the ball valve and the graphite tetrafluorotherhep, steam leakage, which eventually leads to temperature rise. <br><br>1. Operators take timely cooling measures, and close the steam valve, so that the temperature control in the process range, the process of insulation is to fully dissolve the waterless sodium sulfate, because the waterless sodium sulfate solution is stable, to be repaired personnel to replace the steam valve, continue to feed, the quality of the product has no effect. 2.Y58 steam valves were closed at 8:50 on 20 November 2019 and opened at 9:26 a.m. for a total of 36 minutes. Y58 buildings comprising Y58-01 and Y58-02 production areas, Y58-02 production area during the use of steam, not related to other products. Y58-01 during the clean zone of ammonia-based glucose chloride sodium compound salt 9051-A191135 and 9051-A19136 in the vacuum oven oven baking, baking hot water tank temperature shows 55.6 degrees C, in the baking process range (50-60) in the range, no need to heat up. Closing the steam valve has no effect on product quality 3.Review and verification of this year's equipment maintenance records and no leakage from the steam valve was found. Steam valve for long-term use of accessories, such as steam leakage, daily inspection is easy to be found, the probability of such an event is very small, the risk can be controlled. <br><br>1. Replace the steam valve.

On November 20, 2019, operators Zheng Shoubing and Liu Wenbin dissolved the anhydrous sodium sulfate in r103 tank in the general production area of glucosamine sulfate and sodium chloride double salt in building y58. After opening the steam for heating for a period of time, close the steam valve and wait for the temperature to rise naturally to 60.3 ℃ and stabilize, two people weighed the glucosamine hydrochloric acid. At 08:46 am, they found that the steam valve had "Hiss" sound, and the temperature continues to rise to 61.2 ℃, there is a trend beyond the range of dissolution temperature (58-62 ℃).<br>Because the steam valve is impacted by the high temperature for a long time, the graphite tetrafluoro gasket is damaged and deformed, resulting in the gap between the ball valve and the graphite tetrafluoro gasket, and the steam leaks, eventually leading to the temperature rise.<br>1. The operator shall take cooling measures in time and close the main steam valve to control the temperature within the process range. The purpose of heat preservation in the process is to fully dissolve the anhydrous sodium sulfate. Since the anhydrous sodium sulfate aqueous solution is stable, the maintenance personnel shall continue to feed after replacing the steam valve, which has no impact on the product quality. 2. The main steam valve of building y58 was closed at 8:50 and opened at 9:26 on November 20, 2019, with a total closing time of 36 minutes. Building y58 includes production areas y58-01 and y58-02. No steam is used during the production area of y58-02, and no other products are involved. During the cleaning area of y58-01, the compound salt 9051-a191135 and 9051-a191136 of glucosamine sulfate and sodium chloride were baked in a vacuum oven, and the temperature of the hot water tank for drying materials was 55.6 ℃, and the temperature did not need to be increased in the range of drying materials (50 ~ 60) ℃. Closing the main steam valve has no impact on the product quality. 3. The equipment maintenance records of this year were reviewed and checked, and no leakage of steam valve was found. Steam valve is a long-term accessory. If there is steam leakage, it is easy to be found in daily patrol inspection. The probability of such event is very small and the risk is controllable.<br>1. Replace the steam valve.