Grinding system capable of flexibly switching open circuit and closed circuit
By introducing a flexibly switchable open-circuit and closed-circuit grinding system in cement production and utilizing a combination of a dynamic powder classifier and other equipment, the problem of incomplete grinding in cement production has been solved, achieving efficient, low-cost powder utilization and environmentally friendly production.
Patent Information
- Application Number
- CN202422509117.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-16
AI Technical Summary
In existing cement production, intermittent grinding leads to limited production capacity, making it impossible to achieve large-scale continuous production. In addition, the incompletely ground clinker powder wastes particle resources, affecting the admixture powder dosage and production costs.
A flexibly convertible open and closed circuit grinding system is adopted, a dynamic powder classifier is added, and a roller press, static powder classifier, ball mill and storage bin are combined. Through the combined use of static and dynamic powder classifiers, efficient screening and re-grinding of powder materials can be achieved, and the amount of mixed material powder can be increased.
The powder utilization rate is improved, and the powder particle size reaches a high fineness of less than 32μm, which reduces production costs, reduces environmental pollution, and improves production efficiency and product quality.
Smart Images
Figure CN223351847U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of cement production and processing equipment, in particular to a flexibly switchable open and closed circuit grinding system. Background Art
[0002] The existing separate grinding and blending process for cement production used batch production, limiting production capacity and preventing large-scale continuous production. Equipped with two cement grinding systems, the clinker powder and mixed material powders are ground separately. These are then blended in specific proportions to produce various cement products as needed. By grinding the clinker powder and mixed material powders separately, the particle composition of the two materials is optimized, allowing for more complete hydration within 28 days, resulting in higher strength and allowing for an increase in the total amount of mixed material added. Ultimately, this reduces clinker usage and lowers production costs.
[0003] This grinding method is relatively simple, but since some particles of the main material clinker powder are not ground properly, the optimal strength value of the clinker powder cannot be effectively exerted, resulting in insufficient addition of mixed material powder. The unground part of the clinker powder can only serve as a filler, resulting in a waste of resources and is not conducive to low-carbon environmental protection. Utility Model Content
[0004] To solve the above problems, this application provides a flexibly switchable open-circuit and closed-circuit grinding system. The specific technical solutions are as follows:
[0005] A flexibly switchable open and closed circuit grinding system, comprising a roller press, a static powder classifier, a ball mill, a dynamic powder classifier and a storage bin;
[0006] The raw materials enter from the feed port of the roller press, the discharge port of the roller press is connected to the feed port of the static powder concentrator, the discharge port of the static powder concentrator is connected to the feed port of the ball mill, the discharge port of the ball mill is respectively connected to the feed port of the dynamic powder concentrator and the storage bin, and the discharge port of the dynamic powder concentrator is respectively connected to the feed port of the ball mill and the storage bin.
[0007] As a further solution: a plurality of dust collectors are also included, and the static powder classifier, ball mill and dynamic powder classifier are respectively connected to the dust collectors.
[0008] As a further solution: it also includes a plurality of fans, and the dust collector is connected to the fans.
[0009] As a further solution: it also includes a weighing and stabilizing flow bin, the raw materials enter the feed port of the weighing and stabilizing flow bin, the discharge port of the weighing and stabilizing flow bin is connected to the feed port of the roller press, and the discharge port of the static powder classifier is connected to the feed port of the weighing and stabilizing flow bin.
[0010] As a further solution: it also includes a first elevator and a second elevator, the first elevator puts the raw materials into the feed port of the weighing stabilizing bin; the second elevator connects the discharge port of the roller press and the feed port of the static powder classifier.
[0011] As a further solution: it also includes a third elevator and a fourth elevator, the third elevator is respectively connected to the discharge port of the ball mill and the feed port of the dynamic powder selection machine, the discharge port of the ball mill and the storage bin; the fourth elevator is connected to the discharge port of the ball mill and the storage bin.
[0012] As a further solution: a plurality of conveying chutes are also included, and the discharge ports of the second elevator, the fourth elevator and the static powder classifier are respectively connected to the conveying chutes.
[0013] As a further solution: it also includes a cyclone, the static powder classifier is connected to the cyclone, and the cyclone is connected to a fan.
[0014] As a further solution: the static powder classifier is a V-type powder classifier.
[0015] Compared with the prior art, the beneficial effects are as follows:
[0016] A flexible open-circuit and closed-circuit grinding system adds a dynamic powder concentrator to the existing grinding mill system, improving the utilization rate of powder and increasing the amount of mixed material powder. The flexible open-circuit and closed-circuit grinding system is used for grinding powder, so that the powder particles can reach a particle size of less than 32μm, accounting for more than 90%. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of a flexibly switchable open-circuit and closed-circuit grinding system;
[0018] As shown in the figure: 1-roller press, 2-static powder classifier, 3-ball mill, 4-dynamic powder classifier, 5-storage bin, 6-dust collector, 7-fan, 8-weighing and stabilizing flow bin, 9-first elevator, 10-second elevator, 11-third elevator, 12-fourth elevator, 13-conveyor chute, 14-cyclone, A-raw materials.
[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor. DETAILED DESCRIPTION
[0020] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
[0021] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.
[0022] like Figure 1 As shown, a flexibly switchable open-circuit and closed-circuit grinding system includes a roller press 1, a static classifier 2, a ball mill 3, a dynamic classifier 4, and a storage bin 5. Raw material A enters the roller press 1 from the feed port, the roller press 1's discharge port is connected to the feed port of the static classifier 2, the static classifier 2's discharge port is connected to the feed port of the ball mill 3, the ball mill 3's discharge port is connected to the feed port of the dynamic classifier 4 and the storage bin 5, respectively, and the dynamic classifier 4's discharge port is connected to the feed port of the ball mill 3 and the storage bin 5, respectively. Specifically, the static classifier 2 is a V-shaped classifier.
[0023] After initial grinding in roller press 1, raw material A enters static powder selector 2, where fine material is screened and fed into ball mill 3 for secondary grinding. The selector then selects the finished product that meets the requirements, and the coarse powder returns to roller press 1 for further grinding. Upon entering ball mill 3, a dynamic powder selector 4 is added after the ball mill 3. When the powder from the discharge of ball mill 3 is transported directly to storage silo 5, this system becomes an open-circuit grinding system, requiring less equipment and facilitating faster production. When the discharge of ball mill 3 is transported to the dynamic powder selector 4, this system becomes a closed-circuit grinding system. After milling, the powder passes through the selector system, where coarse powder is returned to ball mill 3 for further grinding, and fine powder is transported to storage silo 5. This reduces over-grinding, increases production, reduces power consumption, and makes product fineness easier to control.
[0024] A flexibly switchable open-circuit and closed-circuit grinding system adds a dynamic powder selector 4 to the existing grinding mill system, improving the utilization rate of the powder and increasing the amount of mixed material powder. The flexibly switchable open-circuit and closed-circuit grinding system is used for grinding powder, so that the powder particles can have a particle size of less than 32μm, accounting for more than 90%.
[0025] In this embodiment, a number of dust collectors 6 are also included. The static powder classifier 2, the ball mill 3 and the dynamic powder classifier 4 are respectively connected to the dust collector 6, and the dust collector 6 is connected to the fan 7. The main function of the dust collector 6 is to capture dust and prevent it from diffusing into the air. Through the filtering and purification effect of the dust collector 6, the dust-containing gas can be converted into clean gas emission, which greatly reduces the negative impact of cement production on the environment. The reduction of dust reduces energy consumption in the production process and also helps to improve the purity and quality of the product. At the same time, the dust collector 6 can also realize the recycling and utilization of powder while collecting dust. The filtering device inside the dust collector 6 sieves and classifies the powder particles, recovers them in the storage bin 5 or transports them to the dynamic powder classifier 4, and can be used as finished powder. This not only improves the utilization rate of resources, but also reduces production costs.
[0026] In this embodiment, a weighing and stabilizing flow bin 8 is also included. Raw material A enters the feed port of the weighing and stabilizing flow bin 8. The discharge port of the weighing and stabilizing flow bin 8 is connected to the feed port of the roller press 1, and the discharge port of the static powder classifier 2 is connected to the feed port of the weighing and stabilizing flow bin 8. The weighing and stabilizing flow bin 8 can automatically adjust the feed amount to ensure a continuous and stable supply of powder. This automatic adjustment mechanism helps to achieve the continuity and consistency of the production process and improves production efficiency. The weighing and stabilizing flow bin 8 can not only receive the coarse powder from the V-type powder classifier, but also can stably and continuously feed the coarse powder into the roller press 1 for further grinding. This setting helps to ensure full-feed operation of the roller press 1 and improve the grinding efficiency and stability of the roller press 1.
[0027] In this embodiment, the system also includes a first elevator 9 and a second elevator 10. The first elevator 9 places raw material A into the feed port of the weighing and stabilizing bin 8. The second elevator 10 connects the discharge port of the roller press 1 to the feed port of the static powder concentrator 2. A third elevator 11 and a fourth elevator 12 are also included. The third elevator 11 connects the discharge port of the ball mill 3 to the feed port of the dynamic powder concentrator, and the discharge port of the ball mill 3 to the storage bin 5, respectively. The fourth elevator 12 connects the discharge port of the ball mill 3 to the storage bin 5. Several conveying chutes 13 are also included. The second elevator 10, the fourth elevator 12, and the discharge port of the static powder concentrator 2 are each connected to a conveying chute 13. The elevators and conveying chutes are designed based on the locations of different process steps. Raw materials are efficiently transported from the ground or low-lying areas to the higher levels of the mill or other processing equipment, improving production efficiency.
[0028] In this embodiment, a cyclone 14 is also included. The static powder concentrator 2 is connected to the cyclone 14, and the cyclone 14 is connected to the fan 7. One of the main functions of the cyclone 14 is to separate dust and particulate matter in the ball mill 3. When the gas carrying dust and particulate matter enters the cyclone 14, due to the mechanical principle of the cyclone, the dust and particulate matter are separated onto the inner wall of the cyclone 14 under the action of the cyclonic force, and slide down along the inner wall to the discharge port, and finally fall into the ball mill 3, ensuring that relatively clean gas can be discharged outside the system and reducing environmental pollution. Among them, the cyclone 14 is connected to the second transport chute, which acts as a buffer, allowing fine-particle powder to smoothly enter the ball mill 3 for grinding.
[0029] Taking the production of P.P32.5 cement as an example, under the premise of using raw materials of equal quality, the original combined grinding system grinds cement with a clinker ratio of 61%, a gypsum ratio of 4%, and a total admixture content of 35%. After the implementation of this technical solution, a flexible open-circuit and closed-circuit grinding system can be flexibly converted, the admixture content can be increased by more than 5% on the basis of the original grinding cement process, that is, the clinker ratio is 56%, the gypsum ratio is 4%, and the total admixture content is 40%. This can significantly reduce the cost of cement production, achieve better economic benefits, and also help improve market competitiveness.
[0030] In the description of the present invention, it should be understood that the terms "middle", "length", "upper", "lower", "front", "back", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0031] In the present invention, unless otherwise expressly specified or limited, a first feature "on" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. "Multiple" means at least two, such as two or three, unless otherwise expressly specified or limited.
[0032] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0033] The above is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention without creative work should be included in the scope of protection of the present invention.
Claims
1. A flexibly switchable open and closed circuit grinding system, characterized in that: Including roller press, static powder classifier, ball mill, dynamic powder classifier and storage bin; The raw materials enter from the feed port of the roller press, the discharge port of the roller press is connected to the feed port of the static powder concentrator, the discharge port of the static powder concentrator is connected to the feed port of the ball mill, the discharge port of the ball mill is respectively connected to the feed port of the dynamic powder concentrator and the storage bin, and the discharge port of the dynamic powder concentrator is respectively connected to the feed port of the ball mill and the storage bin.
2. The flexibly switchable open and closed circuit grinding system according to claim 1 is characterized in that: It also includes several dust collectors, and the static powder classifier, ball mill and dynamic powder classifier are respectively connected to the dust collectors.
3. The flexible switchable open and closed circuit grinding system according to claim 2 is characterized in that: It also includes a plurality of fans, and the dust collector is connected to the fans.
4. The flexibly switchable open and closed circuit grinding system according to claim 1 is characterized in that: It also includes a weighing and stabilizing flow bin, the raw materials enter the feed port of the weighing and stabilizing flow bin, the discharge port of the weighing and stabilizing flow bin is connected to the feed port of the roller press, and the discharge port of the static powder classifier is connected to the feed port of the weighing and stabilizing flow bin.
5. The flexibly switchable open and closed circuit grinding system according to claim 4 is characterized in that: It also includes a first elevator and a second elevator. The first elevator puts the raw materials into the feed port of the weighing and stabilizing flow bin; the second elevator connects the discharge port of the roller press and the feed port of the static powder classifier.
6. The flexibly switchable open and closed circuit grinding system according to claim 5 is characterized in that: It also includes a third elevator and a fourth elevator, the third elevator is respectively connected to the discharge port of the ball mill and the feed port of the dynamic powder selection machine, the discharge port of the ball mill and the storage bin; the fourth elevator is connected to the discharge port of the ball mill and the storage bin.
7. The flexibly switchable open and closed circuit grinding system according to claim 6 is characterized in that: It also includes a plurality of conveying chutes, and the discharge ports of the second elevator, the fourth elevator and the static powder classifier are respectively connected to the conveying chutes.
8. The flexibly switchable open and closed circuit grinding system according to claim 1 is characterized in that: It also includes a cyclone, the static powder classifier is connected to the cyclone, and the cyclone is connected to a fan.
9. The flexibly switchable open and closed circuit grinding system according to any one of claims 1 to 8, characterized in that: The static powder classifier is a V-type powder classifier.