In July, China ’s wells and mines talked about transportation, pipeline blocking accident handling and prevention. Zhang Xuewen Hubei Lantian Salt Chemical Plant, Hubei Yunmeng 432505 pipeline rehalogenation, Na2S4 adhered to the corner of the rehalogen pipe and gradually increased The halogen-returning pipeline can be completely blocked in production. We have summarized a relatively simple and practical method to effectively prevent the occurrence of crystallization pipe-blocking accidents and ensure the normal operation of the halogen supply.
1 Overview The mine of Hubei Lantian Salt Chemical Plant belongs to the edge of Yunmeng Yingcheng Mine. The average content of N and S04 in the original halogen is above 40gL.
With the change of service life and location of brine wells, the content of Na2S04 is also different, taking the new 1256 tablets as an example. The two pairs of wells were put into use in 1989, and their 35 and 4 scenes are at 408, while the new 341 = well is to the north of it, about 0.5 apart, and was deducted in 1990. For the 4th test, due to the length of 35, the use of a pipe back to the heart makes the heart 2504 adhere to and quickly increase in the halogen return pipe, gradually blocking the halogen return pipe. Only from 1996 to February 1997, the heart 2504 crystal blockage occurred twice. The entire factory was forced to stop production for 2 days, which seriously affected the normal production. The second pipe plugging caused a direct economic loss of nearly 50 yuan to the factory.
2 Analysis of crystal formation of Glauber's salt in rehalogen pipes According to observations, Xin, 4 The reason for crystal blocking in rehalogen capsules is the original halogen. 8 heart must, 4 average content is 1.28 10.68 a few 40. It is easy to be in, the hydra in the hydrazone and + stacking, the longer the halogen backing time with a fixed pipeline, the greater the possibility of crystallization blocking the pipe. Especially when the temperature drops below 0, it is the most suitable temperature for 28, 4 crystallization. As for the analysis of the analysis of the crystal plugging material, the crystal 98 is the heart, 4 components, 2 is the shoulder 8 and other components. As a result, the crystalline plugging tube is mainly 28, 4.
It was laid in Fudao. Due to the change of topography and landform, some areas were buried underground, and some areas were exposed. There were 90-degree and 5-type corners. It also created conditions for 325 and 4 to accumulate in the pipeline.
When laying the pipeline, the debris in the pipe, such as bricks, stones, wooden sticks, etc., are not removed. These debris waves say that the water is at the corner of the pipeline, and it is also an important factor for 12304 and other substances to adhere to the crystalline plugging. 3 Judging and handling of the 3 plugging in daily production, how to determine whether the tube is blocked, first, 23, 4 crystalline plugging The tube can be divided into two types according to the length of the product. The large and small plugs can discharge crystals 100 each time. Take the 15, 30 and 9 brine extraction pumps produced by Yichang as an example. The water injection flow rate of the pump is 155, the specific current is 200200 into the ftjJj3Mpa, 0l4Ummllif tube, and the amount of halogen output accounts for the tube. When the inner diameter is 34 strong, it can be regarded as normal. However, when the temperature is relatively low, the water intake of the brine extraction pump is reduced, the current and pipeline pressure are significantly reduced, and the halogen output is gradually reduced without impulse, it can be judged that the 1304 crystalline pipe is blocked and the tunnel is broken. Except for severe faults.
When the pipeline pressure drops significantly and the amount of halogen output decreases, you can listen along the halogen pipe. At this time, it is audible to make a squeak sound with the middle of the tube blocking the dead place. After locating the position, keep the pump and the valve closed. Use a sledgehammer to line the front of the crystal place and hit the halogen back pipe. Under the vibration of the external force, the heart will be returned. 4 The crystal is loose and under pressure Push the crystal body down to achieve the purpose of smoothing back the halogen. Be sure to pay attention when tapping the crystal. Do not use everyone to avoid breaking the halogen tube. You must knock from the front of the crystal to the opposite direction of the halogen back to prevent the back knot The body is pushed to the front knot, forming a new blocking point. If the beating does not achieve the intended purpose, firewood can be used to pile firewood on the halogen return pipe in the crystallization part. After about 4 minutes, you can hear the tearing sound from the halogen return pipe and push the melted crystal away under the pressure of the pipe.
4 Prevention of Crystallization of Glauber's Salt in Rehalation Tubes 2304 The crystallization in the rehalation tube is formed under certain conditions. As long as you have mastered this rule, use scientific methods to master every link of mining. It can be achieved to prevent the product.
First, exchange the return brine pipe with the freshwater pipe every month. Change the freshwater pipe to the return brine pipe and the return brine pipe to the freshwater pipe. In this way, after exchange and use, the 2304 crystals in the original halogen-returning tube still remain on the wall of the tube. After a period of fresh water washing, these knots will become fewer and fewer.
Finally washed away.
First, according to the original brine center of the brine wells and the level of the 4 contained in the brine, the back-halogen pipe will be back-flushed every week, and the time for each back-flush is 30 minutes. In addition, the back-halogen pipe must be recoiled after each shutdown.
Backpressure the remaining brine in the pipe to the well with fresh water. The time can be recoiled for 2030 minutes according to the distance of the return pipeline. Then close the wellhead device valve. Otherwise, there will be surplus in the back-halogen pipeline, and the water will not flow out or flow, and crystals will form after a long time.
First, when the wellhead is recoiled in the field, it requires close cooperation between the operating personnel and the wellsite personnel. The operator carefully observes the changes in the current pipeline pressure and various data of the pump at the post, and at the same time, makes good communication links, so as to avoid the high pressure caused by the bad intermediary. It can also be carried out without stopping production, without any impact on production.
5 Conclusion once happened. It has caused severe production and the losses are huge, but it can be prevented. Although its formation is caused by many factors, the treatment and prevention method of crystallization plugging of Hua 2304 in the halogen return pipe is easy to operate, flexible, economical, and operable. Provided a reliable guarantee that the National Quality and Technical Supervision Bureau approved the release of the 2000 National Standard for Edible Salt on April 20, 2000. The National Bureau of Quality and Technical Supervision approved the release of the national standard for edible salt 54612000 with the approval letter No. 2, 55 of the Quality and Technical Supervision Standard. This standard is listed as a mandatory standard and will be implemented as of October 1, 2000.
Wang Kun
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