Table 1 Guaranteed value and performance test results Item guaranteed value 100% Load test result Corrected result Desulfurization efficiency /% SO2 concentration in net flue gas / mgDm Dust concentration in net flue gas / mg"m HF concentration in net flue gas / mgDm net smoke Gas HCl concentration / mgDm desulfurization island total pressure loss / kPa limestone consumption (dry Vrh process water consumption / m3 °h the entire desulfurization island power consumption / kW can be seen from Table 1, desulfurization island in two circulating pump operation and At low pH, the desulfurization efficiency and pollutant emission concentration are higher than the supplier's guaranteed value. The corrected SO2 concentration can still reach the guaranteed value. The desulfurization island pressure loss is measured when the three circulating pumps are running. The value is far below the supplier's guaranteed value, and the resistance loss is only 1.99 kPa; the power consumption of the entire desulfurization island is very small, only 1 501 kW, which only accounts for about 0.6% of the unit's power generation. Corrected to the SO2 concentration of 2600 mg/m3, 3 The power consumption of the circulating pump is only 1 734 kW, which accounts for 0.7% of the unit's power generation. The desulfurization island operates at a lower molar ratio of calcium to sulfur. The limestone utilization rate is higher and the consumption is lower, satisfying the limestone. The guaranteed value of consumption while ensuring the quality of the gypsum. In addition, the load adaptability of the entire desulfurization system was also evaluated. When the load was changed from 24% to 100% and the speed was changed from 9.2% to 19.8% per minute, the operating parameters of the entire desulfurization island were relatively stable. No effect. Therefore, the desulfurization island can fully meet the requirements of the boiler unit for load changes. 3 Conclusion The main performance of the desulfurization island of No. 3 and No. 4 boilers of Guohua Beijing Thermal Power Plant has reached the guaranteed value stipulated in the contract. When the molar ratio of calcium to sulfur is lower than 1.01, the desulfurization efficiency can reach more than 95%. The whole desulfurization system has low resistance, low power consumption and good load adaptability, and can fully meet the load change requirements of the boiler unit. Flue gas purification equipment assessment acceptance test guidelines VGB sulfur dioxide measurement, infrared absorption method, instrument UNOR6 and URAS2 boiler desulfurization island technical performance guarantee value acceptance test report R. Guodian Thermal Engineering Institute, 2001. Steel ball mill lining bolt Breaking treatment Tarim Thermal Power Co., Ltd. 2 steel ball coal mills frequently broke off the liner bolts from the start of operation, which seriously affected the normal operation of the unit. In order to make the coal mill operate normally, the methods of reducing steel balls, tightening bolts every day, trimming round corners, and adding buffer materials have been adopted, but the problems have not been solved. In operation, the lining plate, steel ball, coal and coal mill barrel of the steel ball mill have a tendency to slide relatively, and its action on the lining bolts will inevitably form a transverse shear impact on the bolt. According to the analysis of the broken bolt, the broken surface of the bolt is neat and almost no plastic deformation. Therefore, it is preliminarily believed that the bolt breakage is caused by the excessive impact shear force of the bolt and the high hardness of the bolt and insufficient toughness. The impact toughness of No. 30 carbon steel is greater than that of No. 45 carbon steel, and the hardness and yield strength are almost the same. To this end, it was decided to replace the original 45th carbon steel bolt with a 30-gauge carbon steel with a slightly lower strength and higher toughness. Since the replacement in July 1999, there have been basically no bolt breaks, which has solved the problem that has been plagued for many years. (Trained by Deng Yichao, Tarim Thermal Power Co., Ltd.) Loose Leaf Tea Infuser,Loose Tea Infuser,Cute Tea Infuser,Tea Ball Infuser YANGJIANG VOSSEN INDUSTRY AND TRADE CO.,LTD , https://www.cnvossen.com
Treatment of bolt breakage of steel ball mill lining
Table 1 Guaranteed value and performance test results Item guaranteed value 100% Load test result Corrected result Desulfurization efficiency /% SO2 concentration in net flue gas / mgDm Dust concentration in net flue gas / mg"m HF concentration in net flue gas / mgDm net smoke Total HCl concentration/mgDm desulfurization island total pressure loss