Improved double-closed-circuit cement grinding system
By changing the conveying path of the fine material, the fine material is fed into the cement grinding and powder selection machine for screening, the problem of over-grinding of the existing cement grinding system is solved, reducing power consumption and load, and improving equipment utilization.
Patent Information
- Application Number
- CN202421617813.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The existing cement grinding system has excessive grinding, resulting in increased power consumption and load.
By feeding the fine material out of the cyclone separator into the cement grinding and powder selection machine for screening, instead of directly sending it all into the cement grinding, the conveying path of the fine material is changed, ensuring that only unqualified coarse powder is fed back to the cement grinding, and avoiding excessive grinding of qualified finished powder.
It reduces the load and power consumption of cement mills and improves the comprehensive utilization rate of system equipment.
Smart Images
Figure CN222930959U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cement production, in particular to an improved double-closed-circuit cement grinding system. Background Art
[0002] The original cement grinding adopted a double-closed-circuit semi-finished grinding process, that is, the fine powder collected by the roller press pre-grinding system through the three-separator classifier and the cyclone separator could be used as finished products. Due to the influence of multiple factors such as the grinding fineness of the roller press, the classification efficiency of the three-separator classifier, and the cement adaptability, it is currently difficult to implement the cement semi-finished grinding process. Therefore, all the material powder collected by the cyclone separator of the roller press is now sent into the cement mill. Since the material powder collected by the cyclone separator contains a certain proportion of finished products with qualified fineness, after all entering the mill, it will cause problems such as over-grinding phenomenon in the cement mill, increased load, and increased power consumption. Content of the Utility Model
[0003] (1) Technical Problems to be Solved
[0004] In view of the deficiencies of the prior art, the utility model provides an improved double-closed-circuit cement grinding system, which solves the problems of excessive grinding phenomenon existing in the existing cement grinding system and the resulting increase in power consumption and load.
[0005] (2) Technical Solutions
[0006] To achieve the above object, the utility model provides the following technical solutions: An improved double-closed-circuit cement grinding system includes a roller press circulating bucket elevator. A V-shaped classifier is arranged at the discharge port of the roller press circulating bucket elevator. The V-shaped classifier includes a coarse material outlet and a fine material outlet. The coarse material outlet is communicated with an intermediate small bin, the discharge port of the intermediate small bin is communicated with the roller press, and the fine material outlet is communicated with a three-separator classifier.
[0007] The three-separator classifier includes three discharge ports, which are respectively communicated with the roller press, the cement mill, and the cyclone separator.
[0008] A cement mill circulating bucket elevator is arranged at the discharge port of the cement mill, and a cement mill classifier is arranged at the top of the cement mill circulating bucket elevator.
[0009] The cement mill classifier includes two discharge ports. One of the discharge ports is communicated with the cement mill through a grinding tail conveying chute, and the other discharge port is communicated with the cement mill system dust collector.
[0010] A three-way valve is arranged at the bottom of the cyclone separator. Two discharge ports of the three-way valve are respectively provided with a finished product conveying chute and a semi-finished product material conveying chute. The finished product conveying chute is communicated with a finished product bucket elevator, and the discharge opening of the semi-finished product material conveying chute is communicated with the cement mill circulating bucket elevator.
[0011] As a further preference, it further includes a circulation fan which is respectively connected to the V-shaped classifier, the cyclone separator and the cement mill classifier.
[0012] As a further preference, a tail exhaust fan is provided on the dust collector of the cement mill system, and the dust collector of the cement mill system conveys the finished material to the finished bucket elevator through a finished product conveying chute.
[0013] As a further preference, a ventilation dust collector is provided on the cement mill, and the ventilation dust collector is connected to a ventilation fan.
[0014] (III) Beneficial effects
[0015] The present utility model provides an improved double-closed-circuit cement grinding system, which has the following beneficial effects:
[0016] In this improved double-closed-circuit cement grinding system, the fine material coming out of the cyclone separator is sent to the cement mill classifier for screening instead of being directly sent into the cement mill entirely, which changes the conveying path of the fine material. The cement mill classifier will directly collect the qualified finished product through the dust collector, and only the unqualified coarse powder will be fed back to the cement mill. In this way, the qualified finished powder will not be sent into the cement mill for excessive grinding anymore, thereby reducing the load and power consumption of the cement mill and improving the comprehensive utilization rate of the system equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic structural diagram of the present utility model.
[0018] In the figure: 1, roller press circulating bucket elevator; 2, V-shaped classifier; 3, intermediate small bin; 4, roller press; 5, three-separation classifier; 6, cyclone separator; 7, circulation fan; 8, cement mill; 9, cement mill circulating bucket elevator; 10, cement mill classifier; 11, cement mill system dust collector; 12, tail exhaust fan; 13, finished bucket elevator; 14, ventilation dust collector; 15, ventilation fan; 16, finished product conveying chute; 17, semi-finished product conveying chute; 18, mill tail conveying chute; 19, three-way valve. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0020] Such as Figure 1As shown in the figure, the utility model provides a technical solution: an improved double-closed-circuit cement grinding system, which includes a roller press circulating bucket elevator 1. A V-shaped classifier 2 is arranged at the discharge port of the roller press circulating bucket elevator 1. The V-shaped classifier 2 includes a coarse material outlet and a fine material outlet. The coarse material outlet is communicated with an intermediate small bin 3, the discharge port of the intermediate small bin 3 is communicated with a roller press 4, and the fine material outlet is communicated with a three-separator classifier 5.
[0021] The three-separator classifier 5 includes three discharge ports, which are respectively communicated with the roller press 4, a cement mill 8 and a cyclone separator 6. A ventilation dust collector 14 is arranged on the cement mill 8, and the ventilation dust collector 14 is communicated with a ventilation fan 15. The dust in the cement mill 8 is absorbed by the ventilation dust collector 14, and the tail gas is discharged through the ventilation fan 15.
[0022] A cement mill circulating bucket elevator 9 is arranged at the discharge port of the cement mill 8, and a cement mill classifier 10 is arranged at the top of the cement mill circulating bucket elevator 9.
[0023] It also includes a circulating fan 7 (air flow providing device), and the circulating fan 7 is respectively communicated with the V-shaped classifier 2, the cyclone separator 6 and the cement mill classifier 10.
[0024] The cement mill classifier 10 includes two discharge ports. One discharge port is communicated with the cement mill 8 through a grinding tail conveying chute 18, and the other discharge port is communicated with a cement mill system dust collector 11. A tail discharge fan 12 is arranged on the cement mill system dust collector 11. The waste gas of the classifier system is discharged into the atmosphere by the tail discharge fan 12 after passing through the dust collector. The cement mill system dust collector 11 conveys the finished product material to the finished product bucket elevator 13 through a finished product conveying chute 16.
[0025] A three-way valve 19 is arranged at the bottom of the cyclone separator 6. The two discharge ports of the three-way valve 19 are respectively provided with a finished product conveying chute 16 and a semi-finished product material conveying chute 17. The finished product material in the finished product conveying chute 16 is conveyed to the finished product warehouse through the finished product bucket elevator 13, and the discharge port of the semi-finished product material conveying chute 17 is communicated with the cement mill circulating bucket elevator 9.
[0026] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.
[0027] During use, after the raw materials are crushed in the roller press 4, they are lifted by the roller press circulating bucket elevator 1 and sent into the V-shaped classifier 2. The fine materials after screening are sent into the three-separator classifier 5, and the coarse materials enter the roller press 4 again through the intermediate small bin 3 for crushing until they meet the requirements and then are sent into the three-separator classifier 5.
[0028] The three-separation powder separator 5 can screen materials into three grades (coarse powder, medium powder, and fine powder). The coarse powder is directly fed into the roller press 4 for repeated grinding. The medium powder is fed into the cement mill 8 for fine grinding, and after grinding, it is fed into the cement mill powder separator 10 through the cement mill circulating bucket elevator 9. The selected fine powder enters the cyclone separator 6 along with the separation air flow.
[0029] In the traditional semi-finished cement grinding process, for example, when producing low-grade cement (such as M32.5), the particle size of the powder coming out of the cyclone separator 6 has reached the finished product requirements, so it can be directly sent out through the finished product conveying chute 16 and finally conveyed to the finished product warehouse through the finished product bucket elevator 13. However, for cement varieties with a grade above 42.5 currently produced, the particle size and morphology of the powder coming out of it are difficult to meet the requirements. Therefore, it cannot be directly conveyed as a finished product, but needs to be fed into the cement mill powder separator 10 through the semi-finished product conveying chute 17 for secondary screening and then continue grinding. Therefore, we actually provide two process routes: when the three-way valve 19 is connected to the finished product conveying chute 16, it is a semi-finished grinding process, and the finished product can be directly output through the finished product conveying chute 16; when the three-way valve 19 is connected to the semi-finished product conveying chute 17, it is a newly added series and parallel hybrid grinding process of double powder separators, which can be used for the production of cement with a grade above 42.5. Therefore, for now, we temporarily retain the structure of the finished product conveying chute 16.
[0030] The cement mill powder separator 10 can perform secondary screening on materials. The qualified finished product materials are directly absorbed by the cement mill system dust collector 11, fed into the finished product bucket elevator 13 through the finished product conveying chute 16, and finally conveyed to the finished product warehouse. The unqualified materials are fed into the cement mill 8 through the tail grinding conveying chute 18 for continuous grinding. By gradually separating the finished product materials, the load on the cement mill 8 is reduced.
[0031] In summary, in the improved double-closed-circuit cement grinding system, by feeding the fine materials coming out of the cyclone separator into the cement mill powder separator for screening instead of directly feeding them all into the cement mill, the conveying path of the fine materials is changed. The cement mill powder separator will directly collect the qualified finished products through the dust collector, and only the unqualified coarse powder will be fed back to the cement mill. In this way, the qualified finished product powder will no longer be fed into the cement mill for excessive grinding, thereby reducing the load and power consumption of the cement mill and improving the comprehensive utilization rate of the system equipment.
[0032] It should be noted that all the electrical components mentioned in this article are electrically connected to the external main controller and the 220V or 380V mains power supply. And the main controller can be a conventional known device such as a computer that plays a control role. Its control principle, internal structure, control switch method, etc. are all conventional means of the existing technology and are directly cited here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.
[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An improved double closed-circuit cement grinding system, characterized in that: It comprises a roller press circulating bucket elevator (1), a V-shaped powder classifier (2) is arranged at the discharge port of the roller press circulating bucket elevator (1), the V-shaped powder classifier (2) comprises a coarse material outlet and a fine material outlet, wherein the coarse material outlet is connected to an intermediate small bin (3), the discharge port of the intermediate small bin (3) is connected to the roller press (4), and the fine material outlet is connected to a three-separation powder classifier (5); The three-separation powder separator (5) comprises three discharge ports, which are respectively connected to the roller press (4), the cement mill (8) and the cyclone separator (6); The discharge port of the cement mill (8) is provided with a cement mill circulating bucket elevator (9), and the top of the cement mill circulating bucket elevator (9) is provided with a cement mill powder separator (10); The cement mill powder concentrator (10) comprises two discharge ports, one of which is connected to the cement mill (8) through a mill tail conveying chute (18), and the other is connected to a cement mill system dust collector (11); A three-way valve (19) is provided at the bottom of the cyclone separator (6), and two discharge ports of the three-way valve (19) are respectively provided with a finished product conveying chute (16) and a semi-finished product conveying chute (17), the finished product conveying chute (16) is connected to a finished product bucket elevator (13), and a discharge port of the semi-finished product conveying chute (17) is connected to a cement mill circulating bucket elevator (9).
2. The improved double closed-circuit cement grinding system according to claim 1 is characterized in that: It also includes a circulating fan (7), which is respectively connected to the V-shaped powder classifier (2), the cyclone separator (6) and the cement mill powder classifier (10).
3. The improved double closed-circuit cement grinding system according to claim 1 is characterized in that: The cement mill system dust collector (11) is provided with a tail exhaust fan (12), and the cement mill system dust collector (11) conveys the finished product material to the finished product bucket elevator (13) through the finished product conveying chute (16).
4. The improved double closed-circuit cement grinding system according to claim 1 is characterized in that: The cement mill (8) is provided with a ventilation dust collector (14), and the ventilation dust collector (14) is connected to a ventilation fan (15).