Yu Jing Wang Xiaonan Gao Zhanjun Liaoning Dandong Yalujiang Paper Group Co., Ltd. (118001) Our company is a large pollution household in Dandong City. The main source of pollution is the waste liquor from the cooking of sulphate wood pulp (black liquor>, black liquor from the old pulp washing system of the plant. The two-row vacuum washing machine of the extraction equipment is limited by the layout of the old factory process, and after years of overloaded operation, the equipment becomes old and aging, the black liquor extraction rate is low, and the pollution is serious: for this reason, on the basis of sufficient argumentation, the factory selects the best The ZNKZ type vacuum washing machine was used as the black liquor extraction equipment.In September 1998, our company successfully carried out the installation and commissioning of the ZNKZ25W vacuum washing machine. After the equipment was put into production, the original washing system of our company was greatly eased. The lack of slurry supply capacity has greatly reduced the pollution load of our company and has good economic and social benefits.
125nf vacuum washing machine process and structural characteristics 1.1 process flow, see 1.2 Structural characteristics This machine is mainly composed of drum, tank body, distribution valve, washing device, stripping device, transmission device and screw conveyor, etc. There is only one distribution valve, one end discharge filtrate, compared with the traditional vacuum cleaner, ZNKZ type vacuum washing using wear-free conical distribution valve and water injection to increase the vacuum and other new technologies, the use of performance than the older vacuum pulper larger Improve. The main technical parameters of the equipment are as follows: drum speed:. 8-3r/min, into the pulp concentration: pressure: 2kPa, air flow: 2000mVh, for the middle of the head tank stirring roller speed: 136r/min, used in the middle of the head tank press feed tank speed 2 production process problems and Improvement measures Washing machine often appears during the operation process, the reason is that the washing pump generates wind during operation, which causes slurry to fall off and form a slurry. Therefore, we solve the problem by removing the washing pump. The problem of heap slurry.
In the cold season of winter, the windmill motors are often burned out, and we observe that it was caused by the condensed water droplets formed after condensation of steam on the motor to cause the motor to burn out. Therefore, we added a return pipe to solve this problem.
The water nozzles of the 1-5 pulp washers are often blocked. This is due to the fact that they were originally designed with a right angle. The fibers inside the whitewashed pulp tend to accumulate and cause clogging. When the water jets are changed to bevel angles, the fibers are easily exposed. Rinse out and no longer block.
The five-stage washing machine screw conveyor often broke and there was no spare, the production caused a very passive, so we then carried out the transformation, remove the screw conveyor improvement trough and use the height difference to directly feed into the vertical well.
The washing water temperature during the production process often falls short of the process requirements of 60-70: the washing effect is not very good, and the black liquor extraction rate is not high. This is because the washing water uses hot sewage, and sometimes the long-term water temperature drop cannot reach. Requirements, so we added a steam pipe in the hot water tank, so that we can control the temperature to meet the requirements.
The filter pipe is often blocked because of the high slurry concentration of the black liquor. This problem is solved by adding a black liquor dilution tube.
2.7 Defoamer motor noise is abnormal, vibration is serious, the inspection is because the exhaust hole is thin, the exhaust volume is not enough, so after the thick exhaust hole, the motor will return to normal.
2.8 Screening System The vibrating screen is often flooded into the slurry port. The pump head is too large and the amount of incoming pulp is unstable is the main reason. The measures taken are the stable slurry tank plus the return pipe.
2.9 Filtration System Shakers often have slurry at the bottom of the sieve. This is due to the sieve covering about 1/3 of the feed opening, and the blanking tube is thinner. It is 4) 159 tubes. After changing the sieve, the feed opening is let out. After the change of the pipeline to 4> 273, the slurry phenomenon no longer occurs.
3 System Operation The project was installed in August 1998. To ensure successful commissioning of one feed, the company organized related personnel in advance to study at a brother paper mill. Based on the experience of the brother paper mill, the company combined its production process flow. Characteristics, the preparation of the production process operating procedures, and operators have been carefully trained, fully prepared for the technical preparations, the company at the end of August 998 to commission the material commissioning. After a period of operation, it proved that the equipment has good performance and high vacuum.
3.1 Production process conditions During the production process, we continuously adjust the process conditions according to the actual situation. Finally, the reasonable process conditions for the equipment are as follows: head tank and each section of the Internet density: 1. 0% -2.0%; each section under the network concentration: 10 % or more; vacuum degree of each section: 0.02-0.27MPa; quantity of hot water added in the fifth stage: 10m3/t slurry; hot water temperature: 60-70; liquid level of the black liquor tank: 3-section drum rotation speed: 2r/min; Second, third, fourth and fifth stage speed: 2.2-2.4r/mm; middle tank level: exposes the top of the feed roller to the pulp surface.
3.2 Washing Quality In the production process, we use the ZNKZ washing machine (new system in Table 1) for vacuum, slurry concentration, black liquor extraction rate, residual alkali volume in washing, and black liquor concentration for alkali recovery. The indicators were tested and compared with the old system pulp washers. See Table 1. The vacuum level of the unit is significantly higher than that of the old system. After washing, the residual alkali of the slurry is greatly reduced, and the quality of pulp washing is greatly improved.
3-3 Environmental Benefits In the production process, we also conducted a small test on the environmental status indicators of the new and old systems. See Table 2C for the data from the table. It can be seen that the ZNKZ 25m2 vacuum gauge 1 new and old systems black liquor extraction situation comparison Table Project Unit Old System New System Washing Machine Vacuum Into Feeding Concentration Pulp Concentration Black Liquor Extraction Rate Residual Volume Black Liquor Concentration Table 2 New and Old System Emissions Comparison Item Unit Old System New System Reduction Rate Volatile Phenol Chromatism Times pH After the pulp washers were put into operation, the concentration of pollutants discharged was far lower than that of the old system, achieving our expected goal of reducing pollution and greatly reducing pollution to the Yalu River.
4 The problems existing in the current system are mainly the flaws in the vibratory screen process of the screening system. The head pressure is large, and the stable slurry tank does not play its due role. The slurry phenomenon often occurs. This not only increases the labor intensity of the operator, but also reduces the Labor efficiency, but also affect the screening effect, affecting the quality of the product, so we have prepared to improve the screening system during the maintenance of equipment, increase the size of the slurry tank, increase the stability of the tank, completely change the process of unreasonable place.
5 Conclusion After the ZNKZ 25m2 vacuum pulp washing machine was put into operation, due to the concerted efforts of all parties, the problems encountered were solved one by one. The start-up and feed was successful, the production operation was stable, the product quality met the requirements, and the expected target was reached. The environmental benefits were very high. Obviously, in November 1998, it passed the acceptance of provincial and municipal environmental protection bureaus. In the future, we will continue to improve and improve the system, and give full play to its potential, to further improve the water environment of Dandong City, and increase the economic efficiency of enterprises. Efforts will be made to improve the economic benefits of enterprises. C Information F2 Blocking “Resistance,†January 30, 2002, from Beijing has a good news. Yueyang Paper Group was awarded the "National Advanced Unit for Internal Auditing" by the National Auditing Office and the National Association of Internal Auditors at the "China Internal Auditing Double First Commendation Meeting." This is the only company in the paper industry that has won this honor; Wang Xiang, general manager of Paper Group, made an experience presentation at the meeting as an advanced unit representative; Peng Li, director of the "Yue Paper" auditing office, was named "National Advanced Individual in Internal Audit".
Since 1998, “Yue Paper†has closely followed the “standard, innovative, and efficient†six-character principle in internal audit work, established the entire chapter, and laid a solid foundation; optimized the work flow, improved working methods; and pursued the best in work quality. The maximization of economic and economic benefits: In 1999, three years of audit projects were completed in 966, and 2,982 material price audit projects were audited. There were 12 economic responsibility audits during the tenure of office, and 21 financial revenues and expenditures, economic efficiency audits, and thematic audits. Article 11 directly approves an amount of 9.6262 million yuan, which not only blocks the company's economic profit, but also more importantly cleans up the company's operations. This time, the double-leader marks that “Yue Paperâ€'s internal audit work has leapt to a new level.
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