Shandong Jinling Iron Mine Shandong Zibo 255081 water ring vacuum pump t water to two L There are two kinds of ring vacuum pump is the most important auxiliary equipment in the vacuum filtration system, its performance and reliable injection not only directly affect the filtration system The normal operation and filtration effects, but also on the operating costs of the filtration system are extremely important.
For a long time, SZ-type water ring true wings have been widely used in filtration systems of concentrators. The pump has high energy consumption, low efficiency and frequent breakdowns. Since the 1980s with the successful deletion of SK radial double-acting water ring vacuum pumps, some ore dressing plants have been updated successively with careful empty equipment, and have achieved good results. 1. The water ring vacuum pump produced in China at the time. There are two series of products: SZ type single-acting pump and SK type double-acting pump. Only a few water pump plants can produce double-acting pumps. At present, there are many manufacturers and there is such a situation: SK-type real wings with identical names and specifications have different structural forms and great differences in performance, causing inconvenience and misunderstanding to users when selecting them. If the understanding of the true fin performance characteristics is not comprehensive enough, blind selection may be related to Pan, which does not achieve the desired effect. In fact, some concentrators have gone through detours in varying degrees during the transformation process and have to perform. b) The performance curve of the pumping capacity of SZ type pumps with under-reconstructed single-acting pumps is relatively steep. As the vacuum level increases, the intake volume drops rapidly. The pumping capacity of the SK pump can be improved and the pumping performance curve is flat.
The double-acting pump has a flat pumping curve over a wide range, and when the vacuum level increases, the suction amount decreases less.
The SZ-4 type single-acting pump with the same nominal pumping capacity and the SK-27 double-acting helium-contained 0S performance curve. 13-axis power (1) Single-acting pump shaft power curve is hump-shaped and changed to 6 units. Table 3 Comparison of technical and economic indicators before and after the transformation of the water ring vacuum pump Item Number of installations Simultaneously start number Vacuum degree (kPa) Cake moisture (%) Utilization factor (t/m2h) Mounting power (kW) Actual power consumption (kW) Large water consumption. When the vacuum degree is 35~50kPa, the power is maximum.
It works in a vacuum zone (above 80 kPa) and has a high efficiency, but the load of the pump is too high under the medium and high vacuum area and the high wind volume of the cousin.
(2) The double-acting pump power curve is an approximate straight-line shape with slightly upturned ends, and the change range is small. In the medium and high vacuum areas, the high efficiency of the pump is greatly enhanced by the high wind pressure of the industrial brother.
The single-acting pump and double-acting helium from the power "can see one of the typical injection energy curves.
The working principle of single-acting pump and double-acting pump is the same, except that the structure is different, and there is a big difference in performance.
SZ type single-acting pump has simple structure and high ultimate vacuum, but it has many faults and high energy consumption. When the vacuum degree increases, the suction volume decreases. SK Teng action pump suction improved, there is no significant change in the performance of his stuffing, and with the impeller end face and end cap (or suction non-gas a disk) Teng, the pump's ultimate vacuum and gas volume will drop. SK double-acting pump has advanced structure, large pumping capacity, high efficiency, low energy consumption, low failure, long service life, and At wheel and end cover and distributor are not easy to wear, and the performance of the pump can maintain long-term stability. With the requirement for medium and more filter work, the disadvantage is that the structure is more complex and the ultimate vacuum is not as high as a single acting pump.
2 Application Practice of Radial Double-acting Water Ring Vacuum Pump Shandong Jinling iron ore concentrator (iron, copper and cobalt) filtration system has a total of 8 vacuum filter machines, the filter normally starts the most filter area 78 vacuum tone has Shanghai Yonggu machine The company produced two R200 water ring vacuum pumps and two SZ-4 water ring true wings produced by Boshan. These two kinds of real wings are old products in the 570s of the last century. They have high energy consumption, low efficiency, frequent breakdowns, and failures such as broken shafts and broken Pi wheels constantly occur. Not only do they often affect the normal operation of the filtration system, but the filtration efficiency decreases year by year. Operating costs have remained high for a long time. In order to change this situation, we decided to bribe the vacuum equipment. The coworker's characteristics and problems in the reforming system were analyzed. It was considered that the vacuum filter's filtration process is different from the vacuum suction from the closed container. Because the filter medium and the filter cake have good air permeability, they are only kept high. Under vacuum condition, when there is a large amount of air extraction, the filtering effect can be guaranteed. The key is to use a vacuum pump that has fewer energy-saving faults, long service life, and adapts to the operating requirements and operating conditions of the filter. After learning lessons from the failure of the application of the SK type single-acting pump, after investigation and technical and economic argumentation, it was determined that the SK-85 radial double-acting water ring vacuum pump produced by Henan Xinxiang Pump Factory would be replaced instead of the old vacuum pump.
1 Usage It was completed in 2000. After more than 5 years of production practice, the SK-85 Radial Double-Axis Water Ring Vacuum Pump has the following advantages: (1) Smooth operation, less failure, and no long-lived, broken shaft or broken for 5 years Impeller and other mechanical failures, less maintenance work, low cost; (2) high efficiency, low energy consumption, large amount of power-saving electricity saving effect is significant, the actual power consumption is reduced by 594%. When the vacuum is high, can still maintain a large suction Gas capacity, its performance is very suitable for beneficiation 1 air filter machine working requirements; (3) work reliability can be adjusted easily to facilitate the leafhopper distributor and end cover is almost no Teng, long-term operation can maintain stable or even improve performance (due to fouling so that the gap becomes Small marriage green so). A cone-shaped distributor is used. The gap between the inner hole of ti wheel and the distributor can be adjusted according to different conditions of use. (4) The noise is low and a dual-chamber reflective muffler separator is used. The noise is low and the work environment is good. .
7 The technical and economic indicators before and after the water ring construction are shown in Table 3 > 2 Economic benefits (1) The annual energy saving of the real pump is 95.04 million kWh, the energy saving fee is 4Z52 million, the annual water saving is 76,000 tons, and the water saving fee is 45.6 million yuan; The audio fee was 2.85 million yuan and the above three items were 54S3 million.
(2) Due to the increase of filtration efficiency, the filtration system reduced driving time, saving 21.87 million sand Vh per year, and saving 10 million yuan in electricity.
The annual comprehensive efficiency of 870,000 yuan.
3 Concluding remarks (1) The selection of the water ring type true wing should be based on the working requirements and operating conditions of the filter system, and considering reliability and operating costs, etc., and after fully understanding the performance characteristics of the pump, it is determined after technical and economic argumentation. Must not blindly choose.
A Convenient Algorithm for Tension of Belt Conveyor LI Geng-hui 1 SONG Ji-ming 1 SHEN Yan-ling 2 1 Nanfang Concentrator, Bengang Group Mining Co., Ltd., Benxi, Liaoning 117014 2 The calculation of the School of Civil and Environmental Sciences at Beijing University of Science and Technology needs to be based on the actual lateral shape of the conveyor belt. Auxiliary loading conditions with M radial double acting water ring vacuum pump, report. 199 Type 51 conveyor tensioning is one of the basic guarantees for the reliable operation of the tape. It has the necessary tension to prevent the tape from slipping and the excessive tape sag. Insufficient tension on the belt conveyor can lead to slippage. In severe cases, it will cause tape to cause significant loss of staff.
“General 3 tension calculations shall firstly determine the total resistance of the tape and determine the driving force and the special injection point tension through resistance. However, when determining the actual tension of the belt conveyor, the analysis and calculation of the bearing branch resistance are complicated and the parameters are To determine the difficulty, this article describes a simple algorithm, as follows.
1 Force analysis of belt conveyors The basic layout of belt conveyors is seen in the fact that due to the ambiguity in their design criteria, the actual calculation of the tension force is based on the basic data of a simple side belt conveyor. Therefore, The following analysis and calculation of force are based on a simple belt conveyor of the side type.
Since the belt conveyor is a viscoelastic body, during the operation, rigid displacement and elastic displacement occur, and the normal stress of the tape is in a curve relationship with the line strain. Therefore, the tension at each point is different, and the tension of the simple belt conveyor of the lateral type is From the encounter point to the separation point, the point gradually becomes smaller. According to the point-by-point calculation method, the tape 3 long-distance from the dynasty to the graves CD point is added point by point, and the enthalpy point is the minimum tension point of the return branch, and the point C is the bearing branch. The minimum point of tension, point D is the maximum tension point of the belt conveyor, a 々 two points of tension difference is the traction force of the conveyor. The belt conveyor is basically affected by three kinds of forces: the peripheral driving force Fu, the tensioning force F. and the P rib and the factory 0 are visible, but the resistance is more complicated, the P-rib and the IF resistance are numerically equal to the weekly driving force, In contrast, the direction includes the main resistance additional resistance plant, the main special resistance FS1, the additional special Pfi force FS2 and the tilt resistance Fst. Among the five resistances, the heart FN is common to all belt conveyors, FS1, FS2 and Fst(2) SK Radial Double-acting Water Ring Vacuum Pump has the advantages of advanced structure, reliable operation, stable performance, long life, high efficiency and energy saving, and has the characteristics of large volume and energy saving under moderate and high vacuum conditions, and its performance. It is very suitable for the working requirements of the vacuum filter in the ore dressing plant and it is worth popularizing and applying.
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