Device and method for improving powder selecting efficiency of O-SEPA powder selecting machine

Abstract

The invention discloses a device and method for improving the powder selecting efficiency of an O-SEPA powder selecting machine, and belongs to the technical field of cement production equipment. The device comprises a feeding main air chute distributor, a guide plate entering a powder concentrator chute and a powder concentrator inlet chute distributing plate, an included angle of 45 degrees is formed between the distributor and the center line of a main chute, the guide plate entering the powder concentrator chute is in a splayed shape to force materials to be centered, and a powder concentrator chute is provided with a partition plate to uniformly distribute the materials. According to the method, the working state of the powder concentrator is judged by detecting material screen residues, the temperatures of an air chute and an articulated chute are measured, the material distribution uniformity is judged by checking the abrasion conditions of the chute and the articulated chute, the distribution structure is optimized by adopting the device, and then the rotating speed and the air proportion of the powder concentrator are adjusted. The problems that the powder selecting efficiency of the O-SEPA powder selecting machine is low and feeding distribution is uneven are solved, the powder selecting efficiency is improved to 75% or above from 65%, the machine-hour yield of the system is improved by 10% or above, the power consumption is reduced by 8.0% or above, the structure is simple, and the upgrading and reconstruction cost of the system is low.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cement production equipment, and particularly relates to a device and method for improving the powder selection efficiency of an O-SEPA powder selector. BACKGROUND

[0002] As a dynamic powder selection device matched with a cement mill, the powder selection efficiency of the O-SEPA powder selector directly affects the production quality and power consumption of the cement grinding system. In the prior art, the design powder selection efficiency of the O-SEPA powder selector is usually 65%, which is difficult to meet the production requirements of high efficiency and low consumption.

[0003] The main reasons for the low powder selection efficiency include that the material distribution of the material distributor is uneven, the material quantity in each feeding chute and the chute is greatly different, and an even material curtain cannot be formed on the material scattering disc; when the material scattering disc is seriously worn, the material scattering and distribution effect is more seriously affected; the ash deposition in the air inlet causes the wind speed direction to change, and the wind speed deviation is large at different positions of the circle; the static blade or the dynamic blade is worn or falls off, causing material short circuit.

[0004] Among them, the uneven material distribution problem is difficult to be found and solved due to its strong concealment, which becomes a key factor restricting the improvement of the powder selection efficiency. Therefore, it is of great significance to develop a method for judging uneven material distribution and to develop a device that can effectively solve the uneven material distribution, thereby improving the powder selection efficiency of the O-SEPA powder selector. SUMMARY

[0005] The purpose of the present application is to provide a device and method for improving the powder selection efficiency of an O-SEPA powder selector.

[0006] To achieve the above purpose, the present application provides the following technical scheme: A device for improving the powder selection efficiency of an O-SEPA powder selector, comprising a feeding main chute distributor, an inlet powder selector chute guide plate and a powder selector inlet chute; the distributor is arranged in a "7" shape at the three-way position of the end of the feeding main chute, the front half of the distributor divides the channel of the main chute into two, the included angle between the rear half of the distributor and the center line of the main chute is 45°, and the end of the rear half of the distributor is connected with the chute shell; the height of the distributor exceeds the material surface of the main chute, the extension plate length of the distributor is 100 cm, and a flexible sealing structure is arranged at the bottom of the distributor; the inlet powder selector chute guide plate comprises two symmetrically arranged plates, the distance between the ends of the two plates is half of the main air chute, and the two plates are respectively welded to the inner side of the chute; a partition plate is arranged in the main inlet chute of the powder selector, and the partition plate uniformly separates the material into two branch chutes based on the material center line, and the height of the partition plate exceeds the material surface.

[0007] Specifically, the distributor is arranged at the three-way position of the end of the feeding main chute, which is used to control the uniform distribution of the material in the main chute to the two secondary chutes of the inlet powder selector, so as to ensure that the material quantity in the two secondary chutes is consistent.

[0008] Specifically, the guide plates include guide plates symmetrically arranged at the end of the chute of the classifier.

[0009] Specifically, the partition plate arranged in the main chute of the classifier separates the material evenly into two branch chutes with the material center line as the reference, the height of the partition plate exceeds the height of the material surface, and the materials on both sides of the partition plate enter the two branch chutes and are fed to the material distribution disc of the classifier.

[0010] A method for improving the classification efficiency of an O-SEPA classifier, comprising the following steps: S1, by detecting the 45μm and 80μm sieve residue percentage in the material entering the O-SEPA classifier, the coarse material and the finished product, calculating the classification efficiency and the coarse powder sieve residue, and determining the running state of the classifier; S2, by measuring the temperature of the chute and the horizontal side of the chute or observing and measuring the wear height of the inside of the chute, quantitatively judging the uniformity of material distribution, when the temperature mutation point height of each chute and the wear height are consistent, it is determined that the distribution is uniform; S3, based on the judgment results of S1 and S2, the above-mentioned device is used to optimize the material distribution structure, so that the material quantity in each feeding chute and chute is consistent; S4, after optimization, the 80μm, 45μm square hole sieve residue value and specific surface area of the finished product and coarse powder are tracked and detected, the rotation speed of the classifier and the proportion of primary, secondary and tertiary air are adjusted until the system is stable.

[0011] Specifically, the detection frequency of the adjustment process in step S4 is 30min / time, and after the system is stable, the adjustment is 2h / time.

[0012] Specifically, in step S4, the rotation speed of the classifier is reduced by 10%-15%, and the tertiary air volume is dynamically adjusted according to the proportion of primary and secondary air to achieve the best air-material matching.

[0013] The beneficial effects of the present application are: By optimizing the material distribution structure, the problem of uneven distribution of traditional O-SEPA classifier is solved, the material forms a uniform material curtain on the material distribution disc, combined with dynamic adjustment of the air-material ratio, the classification efficiency can be improved from the original 65% to more than 75%, which is much higher than the industry standard. After the classification efficiency is improved, the per hour output of the cement grinding system increases by 10%, and at the same time, the system power consumption is reduced by 10.0% due to the reduction of over-grinding phenomenon and optimization of the rotation speed of the classifier, realizing the production goal of high efficiency and low consumption.

[0014] The device consists of a main feed chute distributor, a guide plate for the classifier chute, and an inlet chute for the classifier. It features a simple structure, low modification difficulty, and is suitable for upgrading and optimizing existing O-SEPA classifiers without requiring large-scale equipment replacement, thus reducing application costs. By tracking and monitoring the sieve residue and specific surface area of ​​the finished product and coarse powder, combined with adjustments to rotation speed and air ratio, the quality of the finished product can be stably controlled, reducing product fluctuations caused by poor classification. Attached Figure Description

[0015] Figure 1 The red line represents the structural diagram of the feeding chute tee position shown in this invention. Figure 2 A schematic diagram of the guide plate of the inclined trough of the powder separator shown in this invention; Figure 3 The schematic diagram of the feeding chute tee for material distribution shown in this invention.

[0016] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a distributor 2 is installed at the end of the main feeding chute 1. The distributor makes an angle of 45° with the center line of the main chute. The end of the distributor intersects the center line of the main chute. The distributor is 5cm higher than the material surface of the main chute. The extension plate is 100cm long. The bottom is sealed with a rubber gasket to prevent material leakage.

[0019] Specifically, distributor 2 is a three-way valve; like Figure 2 As shown, a guide plate 4 is installed at the end of the inclined chute 3 of the powder feeder, which is 5cm higher than the material surface. A rubber sealing gasket is used at the bottom to achieve a flexible seal and prevent material leakage.

[0020] like Figure 3 As shown, the inlet chute 5 is equipped with a stainless steel partition plate 6, which is 5cm higher than the material surface. It is installed vertically with the center line of the material in the connected inclined chute as the reference to ensure that the material volume on both sides is consistent. The yellow rectangle is the partition plate, and the red solid line and dashed line are the guide plates 7 of the front and rear chutes, respectively.

[0021] The method of using the above-mentioned device is as follows: S1, orientation judgment: take into the material, coarse powder, finished product sample, respectively, detect 45 μm and 80 μm screen residue. If the powder efficiency is less than or equal to 65%, or the coarse powder 45 μm screen residue is less than or equal to 65%, it is determined that optimization is needed. S2, quantitative judgment: use a temperature detector to detect the temperature of each chute side, and mark the temperature mutation point (material surface height). If the temperature mutation point height difference of each chute or chute is more than 2 cm, or the observation and measurement of the internal wear height difference of the chute is greater than 1 cm, it is determined that the distribution is uneven, and optimization is needed. S3, structure optimization: install the above distributor, guide plate and separation assembly to ensure that the material quantity in each feeding chute and chute is consistent; S4, system adjustment: after optimization, the screen residue and specific surface area of finished product and returned powder are detected every 30 min, the speed of the powder separator is reduced by 10%, the air volume of the three-stage air is adjusted to make the proportion of the first, second and third stage air, determine the maximum use of the circulating fan over the containing sedimentary wind, the third stage air is less than 10%, the remaining is supplemented by the second stage air. After stabilization, it is detected every 2 h.

[0022] After implementation, the powder selection efficiency is increased from 63% to more than 75%, the per hour output is increased by 11%, the power consumption is reduced by 10.5%, the over-grinding phenomenon is obviously reduced, and the water requirement of cement is reduced.

[0023] The technical features of the above-described embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0024] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A device for improving the air classifying efficiency of an O-SEPA air classifier, characterized in that, The system includes a main air chute distributor, a classifier chute guide plate, and a classifier inlet chute distribution plate. The distributor is located at the tee position at the end of the main air chute, with an angle of 45° to the center line of the main air chute, and its end intersects the center line of the main air chute. The height of the distributor exceeds the material surface of the main air chute, its extension plate is 100cm long, and a sealing structure is provided at the bottom. The classifier chute guide plate consists of two symmetrical pieces, with the distance between the ends of the guide plates being half the distance between the main air chute and welded to the inner side of the chute. The inlet chute includes two symmetrically distributed branch chutes, with a partition plate at the branch chute branching point. The partition plate is higher than the material surface and evenly divides the material into the two branch chutes based on the material center line.

2. The apparatus according to claim 1, characterized in that, The distributor is a "7"-shaped guide plate. The front half is located at the center of the main inclined channel and divides the channel in the main inclined channel into two parts. The rear half forms a 45° angle with the center and the end is connected to the main inclined channel. The bottom of the distributor adopts a flexible sealing structure.

3. The apparatus according to claim 1, characterized in that, A flow restrictor is installed at the end of the inlet chute of the O-SEPA classifier.

4. The apparatus according to claim 1, characterized in that, A feed distribution plate is added to the inlet chute of the air classifier to evenly distribute the feed into the four main chutes of the O-SEPA air classifier.

5. A method for improving the air classifying efficiency of an O-SEPA air classifier, characterized in that, Includes the following steps: S1. By detecting the percentage of 45μm and 80μm sieve residues in the material entering the O-SEPA classifier, the coarse material exiting the classifier, and the finished product, the classifier efficiency and the sieve residue of the returned coarse powder are calculated, and the classifier status is determined in a directional manner. S2. By measuring the temperature of the transverse side of the chute and the sluice or by observing and measuring the wear height inside the chute and the sluice, the uniformity of material distribution can be quantitatively determined. When the temperature change point height and wear height of each chute and sluice are consistent, it is determined to be uniform distribution. S3. Based on the judgment results of S1 and S2, the material distribution structure is optimized using the device described in any one of claims 1-4 so that the amount of material in each feeding chute is consistent. S4. After optimization, track and detect the sieve residue value and specific surface area of ​​the 80μm and 45μm square hole screens of the feed material, finished product and coarse powder return powder, and adjust the speed of the classifier and the ratio of primary, secondary and tertiary air until the system is stable.

6. The method according to claim 5, characterized in that, In step S4, the detection frequency during the adjustment process is 30 minutes per time, and after the system stabilizes, it is adjusted to 2 hours per time.

7. The method according to claim 5, characterized in that, In step S4, the air classifier speed is reduced by 10%-15%, and the tertiary air volume is dynamically adjusted according to the ratio of primary and secondary air to achieve optimal air-material matching.

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