Ball mill slipper tile analysis of the causes of high temperature and modification

Ball mill slipper tile analysis of the causes of high temperature and 2021 - 02 - 27 Wang Anwei Hao Qingfeng ShuChao jian-qing liu ( Tangshan jidong qixin cement co. , LTD. ) Problems in one, describing a company's new 4000 t/d NSP cement production line, started in December 2010, continual production, cement grinding system is jidong development group independent research and development design of vertical mill and ball mill grinding system of double closed loop. The system has A, B two cement grinding production line, the host equipment configuration for JLM24. Three roller mill plus & Phi; 4. 8米× 9. 5 m slipper ball mill, the system design stage when the output is 175 t/h, through a series of technical reformation, now ZongGeTai when production has reached more than 220 t/h. But since production has been the problem of high temperature of the ball mill slipper tile, severely restricted the production of stable operation, there are a lot of equipment. Actual operation in winter temperature is 88 ℃, the summer because of the clinker temperature of 120 - 180 ℃, the necessity to tile temperature alarming outage value changed gradually from 85 ℃ to 93 ℃. But still often run continuously for several hours, temperature will be over 93 ℃, was forced to stop cool dry grinding. In 2013, was taken in turn increase pull breeze, oil changing and scraping tile; The mill cylinder asbestos board all changed to 5 mm to 10 mm asbestos board; Later in the mill slipper tile bottom increase oil pool cooling system design, the location of the cylinder inner part near the slipper made heat insulation coatings, still can't completely solve the problem, and the oil is serious. In March 2015, the company equipment management personnel and organize related personnel to analyze problems and develop solutions. Second, the analysis of the causes and reasons of high temperature rise is: ( 1) On mill design because of the support for the slipper with a hoop contact form, high linear velocity, friction heat between the slipper and lyre; ( 2) Internal grinding machine into the high temperature clinker grinding and grinding material barrel temperature continues to rise, the heat generated by heat conduction conduct temperature to the slipper tile, tile temperature is high. Even appeared the situation of the mill, grind, grind tile damage crack photos as shown in figure 1. Figure 1 ground tile damage cracking in conclusion, as the stability of equipment operation, improve reliability, formulate the retrofit scheme of the following: ( 1) Demolition of 2 pieces of cylinder liner, in discharging grate plate the original heat preservation cotton 50 mm clearance between shell and increase the castable, completely isolated from mill supporting disc temperature to the cone body heat conduction; ( 2) Will discharge the spiral blade with mill cylinder cavity near slipper position between castable isolate thermal radiation. ( 3) Because it is in the modification of cement delivery during the peak season, no ball cleaning time. To overcome the space limit problems formulated in 180 & deg; Range is divided into two construction schemes, as shown in figure 2. Concrete construction plan is as follows: (figure 2 construction scheme 1) Power grinding machine, the maintenance personnel by the upper mill shell manhole door into the mill barrel inside, began to do material and instrument related preparation work before modification. ( 2) Grinding the grate plate dismantling half, discharging device of the spiral blade symmetric 180 & deg; The removed a doing welding anchor. ( 3) The internal symmetry 180 & deg; Remove the plate a, each a piece of plate and irrigation castable fill 50 mm gap. ( 4) Barrel internal welding 'Y' type anchorage, castable for mixing into mushy solidification for 24 h. ( 5) Open mill slow drive, an internal partner of casting. The above steps, not repeat here. Three, the transformation effect contrast situation after the technical reform its cooling effect obviously, reform before 90. 8 ℃, after transforming fell to 74. 7℃。 According to the current environment temperature and the temperature 20 ℃ in summer forecast, in the summer when mill temperature should be controlled at about 80 ℃, and stable operation of tile temperature alarming value back up 85 ℃ equipment protection value in order to reduce the incidence of accidents. Combined material used in construction costs, the technical transformation of about 2. 50000 yuan. And through the technological transformation, to my company the economic benefits of analysis is as follows: mill can be shipped in the summer season when stable operation, to avoid the frequent downtime, guarantee the stability of the production and shipment. Estimate each year about 278 h, reduce downtime affect production about 5. 50000 t. Reference to 10 yuan per ton profit impact benefit is about 55. 50000 yuan. Avoid frequent stops, and equipment, its annual savings start equipment idle power consumption and power consumption of about 300000 yuan. The above total profits reduce downtime is expected to be about 85 every year. 50000 yuan. Less money through the transformation, prolong the service life of equipment; Lowering the cost of spare parts and maintenance; Both guarantee the stability of equipment operation, reduce the incidence of accidents; And improve the equipment reliability desired goal, has the long-term economic benefits. Source: 'cement project' 04, 2018