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- Jeddah semi - final grinding technology helps cement enterpr
- Release date:2019-03-11 Clicks:89 Classification:Company News
China is a big cement producer, and the technology of cement grinding directly affects the revitalization and development of cement industry. The data show that it takes 3-4 tons of grinding materials to produce 1 ton of cement, the power consumption of grinding takes up 65%~75% of the total power consumption of cement production, and the cost of grinding takes up 35% of the total cost of cement production. In today's increasingly tense energy, this requires us to constantly explore, adopt new ideas, new processes, new technology, toward high-quality, high-yield, energy saving and consumption reduction direction. Therefore, this newspaper published zhu shunming's signed article "jeddah semi final grinding technology helps cement enterprises to save energy and achieve high production", to provide the readers with the experience.
In June 2012, yancheng jida machinery manufacturing co., ltd. made a major breakthrough in the roller-pressing ball mill "double closed circuit combined grinding system" of the 5000t/d production line of China national materials tianshan co., LTD. Kuqa cement branch, which adopted the semi-final grinding process for the roller-pressing system. Φ 4.2 x 13 m output of cement grinding system of 350 t/h, through nearly a year of steady running, finished products the quality of cement production, the manufacturer's full approval, make the system in tianshan shares and domestic same type dry process production line got a comprehensive promotion.
The basic situation before technical reform
At present, the combined grinding system composed of roller press and ball mill is a mature grinding technology widely used by domestic cement manufacturers. This kind of process cement enterprise has high recognition, stable cement output and quality, moderate energy consumption and high system operation rate. On the basis of summing up years of experience in pulverization, the combined pulverization process with roller press and ball mill was studied and analyzed systematically. Analysis showed that in the rolling system, material after roller press strong extrusion, again after early V classifier classification, meal still back roller press, powder after cyclone tube (filter) to collect the direct feed mill, and this part into the grinding powder contains a large number of qualified under 30 microns and fine powder, formed in mill "mat", reduces the ball mill grinding efficiency and produce the serious phenomenon of grinding. Therefore, separating the qualified fine powder produced in the roller pressing system from the grinded material and feeding it into the finished product can greatly increase the output of the finished product and improve the working condition of the ball mill, so as to increase the output of the ball mill.
Nakamura tianshan co kuqa cement branch 5000 t/d production line, cement grinding system host Φ 1800 * 1200 mm roller press + 4.2 * 13 m Φ combined grinding system composed of ball mill, roller press installed power of 1250 kw * 2, with capacity of 610 t ~ 850 t/h; The installed power of the ball mill is 3550kw, and the production capacity is 180t~200t/h. The proportion of materials is 75% of which are mixed, coal gangue 18.5%, gypsum 6.5%, helpless grinding agent, and the specific surface area of finished products is 350m /kg. To give full play to the system of production capacity, saving energy and reducing consumption, in early 2012, sinoma southern xinjiang tianshan shares division Yang Zhaoqi chairman with a group of technical renovation project came to jeddah on Kong jeddah company provides 4 sets of technical process. The technical reform team of the south xinjiang branch of sinoma tianshan co., LTD., together with chengdu cement industry design and research institute and jedda company, had an in-depth exchange and discussion on the technical reform plan, and finally decided to choose the third plan. The fourth plan has further energy-saving potential, which can be used for future transformation.
In the third scheme, the original v-type separator is connected in series with a special high-efficiency eddy current separator, and the fine material after the "V" coarse selection is accurately separated again. The coarse powder is fed into the ball mill, and the fine powder with particle size less than 30 m is separated and then collected into the finished product by a subsequent cyclone. Finally, three parties agree that this kind of technology feasibility of high and low, strong operability, risk, but chengdu cement industry design and research institute put forward original roller press system circulation air volume reached 250000 m after/h, the wind pressure of circulation fan can provide 3500 pa, require new efficient vortex classifier on the system resistance is not more than 1000 pa, choose powder precision to reach more than 0.9 K values. Because the above two kinds of powder concentrator roller pressing semi-final grinding system still involves the selected "fine powder" into the ball mill for grinding, which cannot meet the requirements of the system technical reform, jeddah company has carried out a low-resistance design for the eddy current powder concentrator of the semi-final grinding system, and finally makes the pressure loss of the powder concentrator system less than 800Pa.
The main effect after technical change
In May 2012, the classifier was transported to the technical renovation site. After two weeks of careful installation and trial run, the system was jointly started on June 10 for trial production. In Φ 4.2 * 13 m new ball mill load is only 75%, the system output reached 290 t/h, all doubt such high production system, promptly by combining field calibration measurement system boot time and inventory cement quantity calculation, found that the average yield of 300 t/h. After the operation of the new mill for a period of time, the output of the combined grinding system composed of roller press and ball mill reached a record high of 350t/h after adding the grinding body load of the mill according to the standard.
Good economic benefits have been achieved after the technical renovation of tianshan stock kuqa cement branch:
(1) after the system transformation, due to the increase of output, the system power consumption decreased by more than 20% (about 6kwh/h) year on year. It was calculated based on the output of 350t/h and the annual operation for 300 days. The average comprehensive electricity charge was calculated based on 0.6 yuan/KWH, so the annual electricity saving benefit was 9.072 million yuan.
(2) if the average production increase is calculated as 100t/h and the benefit per ton is calculated as 15 yuan, 720,000 tons of cement will be produced annually and 10.8 million yuan of benefit will be generated.
(3) if the mixing amount of mixed materials and the decrease of consumption of steel balls and lining plates are included, the benefits will be more obvious. The above items are the annual increase of 19872 million yuan.
(4) based on the annual increase benefit of RMB 1,9872 million, the total investment of system reform is about RMB 1.2 million, and the recovery is 22 days.
The qualified fine powder in the roller pressing system is selected to form the semi-final grinding system. The technological process is mostly a powder separator in series between the "V selection" and the fine powder collector to form the semi-final grinding system. There are two forms of powder separator: one is the dynamic vertical powder separator; Second, horizontal cyclone separator. But these two kinds of separator after the use of practice in recent years, the use effect is not very ideal. In this technical renovation, jeddah vortex separator was used to fine grade the "V" fine material, and the fine powder below 30 m was selected into the finished cement. In particular, the quality of cement has been greatly improved, the standard consistency of cement water consumption reduced by 1 percentage point, by the concrete enterprises. The system output is 350t/h, which is more than 100t/h higher than that of the similar production line in tianshan group. The cement power consumption is reduced to below 25kw/t, which is less than 6kwh/t. The economic benefits generated after 1 year of operation are considerable.
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