Efficient energy-saving vertical mill system for cement final grinding

Abstract

The utility model discloses an efficient energy-saving vertical mill system for cement final grinding, which comprises a mill and a V-shaped powder concentrator, and further comprises an air supply pipeline for conveying cold air, the mill and the V-shaped powder concentrator are separately arranged, a bucket elevator is correspondingly arranged between an outlet of the mill and a feed port of the V-shaped powder concentrator, and the discharge port of the V-shaped powder concentrator is communicated with the bucket elevator. And the air supply pipeline is communicated with an air inlet of the V-shaped powder concentrator. Cold air is fed into the V-shaped powder concentrator, the temperature of the V-shaped powder concentrator and the temperature of the powder concentrating system are reduced, and therefore the temperature of a finished cement product is reduced, the temperature of the finished cement product is low, moisture in air absorbed by the finished cement product is reduced, and the hydration phenomenon and the caking problem of cement in a cement silo are avoided. The system is separately arranged, and the operation stability of the system cannot be affected when cold air is fed into the V-shaped powder concentrator.

Description

Technical Field

[0001] The utility model relates to the technical field of cement finish grinding, in particular to a high-efficiency and energy-saving vertical mill system for cement finish grinding. Background Art

[0002] As a grinding equipment widely used in the large-scale production field of non-metallic minerals, the cement vertical mill has many advantages, such as low investment cost, high grinding efficiency, strong drying capacity, high automation degree, environmental protection and energy saving, and reliable performance. However, there are also some disadvantages. The outlet temperature of the mill of the cement vertical mill is high, the temperature of the cement finished product is high, it is easy to absorb water, and the vibration of the mill is large. When the cement vertical mill is grinding, the outlet temperature of the mill needs to be above 80 °C, otherwise the vibration of the mill is large. Then, when the outlet temperature of the mill is high, the temperature of the cement finished product is high. After the cement finished product comes out of the mill and during the cooling process, it absorbs the moisture in the air and brings it into the cement finished product warehouse. The water content of the cement finished product is high. When stored in the cement warehouse, hydration occurs, resulting in caking and reducing the strength of the cement during later use. At the same time, in the cement warehouse, when caking occurs on the wall of the cement warehouse, the attached caking adheres to the wall and becomes thicker and thicker, resulting in the caking of the cement warehouse, reducing the capacity of the cement warehouse, and the cleaning operation of cleaning the attached caking on the wall is dangerous.

[0003] In the traditional cement vertical mill, after the mill crushes the materials, the hot air carries the fine powder and flows into the separator above the mill. The separator sorts the fine powder by the speed of the blades selecting bricks. The qualified materials pass through the separator, and the unqualified materials are blocked by the rotating blades and returned to the mill to be crushed again. In this design, the environment where the mill crushes needs a certain temperature to improve the crushing efficiency and reduce the vibration. If the temperature is low, the vibration of the mill is large. A high temperature is beneficial to improving the crushing effect. At the same time, the temperature of the crushed fine powder will also be high. The fine powder selected by the separator has a high temperature and is easy to absorb the moisture in the air, resulting in hydration and caking in the subsequent processes.

[0004] For example, a raw material vertical mill separator disclosed in Patent CN205042549U includes a grinding part and a separating part. Among them, the separating part includes a separating machine body. A feeding hopper is arranged in the separating machine body, and a separator is arranged above the feeding hopper. The separator includes a static blade group and a dynamic blade group located in the static blade group. The static blade group is fixedly connected to the upper part of the feeding hopper. A driving rod group is fixedly connected in the middle of the dynamic blade group, and the other end of the driving rod group is sequentially connected to a separating speed reducer and a separating motor; the dynamic blade group is a cylindrical structure formed by a plurality of dynamic blades arranged side by side in sequence with the driving rod group as the center of the circle, and the middle and bottom of each dynamic blade are fixedly connected to the driving rod group respectively. A sheet-shaped anti-wear part is overlapped and fixed on one side of the upper part of each dynamic blade, and the sheet-shaped anti-wear part extends out of the outside of the dynamic blade; it has the above problems. Summary of the Utility Model

[0005] In view of the deficiencies of the prior art, the utility model provides an efficient and energy-saving vertical mill system for final grinding of cement, so as to achieve the purpose of system stability and reduce the temperature of the cement finished product.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0007] The efficient and energy-saving vertical mill system for final grinding of cement includes a mill and a V-type classifier, and also includes a air supply pipeline for conveying cold air. The mill and the V-type classifier are separated, and a bucket elevator is correspondingly arranged between the outlet of the mill and the inlet of the V-type classifier. The air supply pipeline is connected to the air inlet of the V-type classifier.

[0008] Furthermore:

[0009] The outlet of the mill is a pair of outlets arranged on both sides of the mill, and a bucket elevator is arranged corresponding to each side outlet. The top of each bucket elevator is connected to the inlet of the V-type classifier through a pipeline.

[0010] The air supply pipeline is a cold air conveying pipe.

[0011] It also includes a fine powder classifier. The air-powder outlet of the V-type classifier is connected to the inlet of the fine powder classifier.

[0012] A temperature sensor and a flow control valve are arranged on the air supply pipeline.

[0013] The pair of outlets are symmetrically arranged on opposite sides of the mill.

[0014] The air inlet of the V-type classifier is inclined, and an adjustable angle opening baffle structure is arranged corresponding to the air inlet inside the V-type classifier.

[0015] The fine powder classifier is a rotary vane classifier, and the rotary vane classifier is fixedly connected above the V-type classifier.

[0016] Coarse powder outlets are arranged at the bottom of the V-type classifier and the bottom of the rotary vane classifier, and both coarse powder outlets are connected to the cavity of the mill.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The efficient and energy-saving vertical mill system for final grinding of cement is reasonably designed. Cold air is sent into the V-type classifier to reduce the temperature of the V-type classifier and the classification system, thereby reducing the temperature of the cement finished product. The low temperature of the cement finished product reduces the absorption of moisture in the air by the cement finished product, thus avoiding the hydration phenomenon and caking problem of the cement in the cement silo; the system is separated, and sending cold air into the V-type classifier will not affect the stability of the system operation. Description of the Drawings

[0019] The following is a brief description of the content expressed in each attached drawing of this specification and the markings in the drawings:

[0020] Figure 1 It is a schematic diagram of the vertical mill system of the present utility model.

[0021] Figure 2 It is a schematic diagram of the powder separator of the present utility model.

[0022] In the figure:

[0023] 1. Mill, 2. V-type powder separator, 3. Dust collector, 4. Air supply duct, 5. Bucket elevator. Specific embodiments

[0024] The following is a further detailed description of the specific embodiments of the present utility model by describing the embodiments with reference to the attached drawings.

[0025] As Figure 1 and Figure 2 shown, the high-efficiency and energy-saving vertical mill system for cement finish grinding includes a mill 1, a V-type powder separator 2, and an air supply duct 4 for conveying cold air; the mill 1 and the V-type powder separator 2 are separated, that is, they are fixedly arranged through different support frames; a bucket elevator is correspondingly arranged between the outlet of the mill and the feed inlet of the V-type powder separator, and the air supply duct is connected to the air inlet a of the V-type powder separator.

[0026] The outlet of the mill 1 is a pair of outlets arranged on both sides of the mill, and a bucket elevator 5 is arranged corresponding to each side outlet. The top of each bucket elevator is connected to the feed inlet b of the V-type powder separator through a pipeline. Further, the pair of outlets and the two bucket elevators are symmetrically arranged on the opposite sides of the mill, with a compact structure.

[0027] The present utility model further includes a fine powder separator and a dust collector 3. The air-powder outlet c of the V-type powder separator is connected to the inlet of the fine powder separator, and the outlet of the fine powder separator is connected to the dust collector, so as to select the qualified fine powder.

[0028] The air supply duct 4 is a cold air conveying pipe; further, a temperature sensor and a flow control valve are provided on the air supply duct to facilitate the control of cold air conveying.

[0029] The fine powder separator is a rotary vane powder separator, and the rotary vane powder separator is fixedly connected above the V-type powder separator to form an integral powder selection structure, with a compact structure, stable and reliable operation. And in the V-type powder separator, cold air is sent in, and at the same time, the temperature of the V-type powder separator and the fine powder separator system is reduced, so as to reduce the temperature of the cement finished product.

[0030] Coarse powder outlets d are provided at the bottom of the V-type powder separator and the bottom of the rotary vane powder separator, and both coarse powder outlets are connected to the cavity of the mill, which can effectively improve the system efficiency.

[0031] The air inlet of the V-type classifier is inclined, and an opening baffle structure with an adjustable angle is provided inside the V-type classifier corresponding to the air inlet to adjust the cold air intake, and the temperature of the cement finished product is low.

[0032] Furthermore, a branch cold air pipe is connected to the cold air conveying pipe. The branch cold air pipe has a smaller diameter relative to the cold air conveying pipe. The branch cold air pipe is connected to the rotary vane classifier to fully reduce the temperature of the cement finished product coming out.

[0033] The system of the present utility model is reasonably designed. Cold air is sent into the V-type classifier to reduce the temperature of the V-type classifier and the classification system, thereby reducing the temperature of the cement finished product coming out. The temperature of the cement finished product is low, reducing the absorption of moisture in the air by the cement finished product, thereby avoiding the hydration phenomenon and caking problem of cement in the cement silo; the system is separated, and sending cold air into the V-type classifier will not affect the stability of the system operation.

[0034] The specific working principle of the present utility model is as follows:

[0035] The design purpose is to separate the systems of the mill and the classifier; the material after being pulverized by the mill flows out from the mill outlet into the bucket elevator, and the bucket elevator sends it into the V-type classifier for preliminary sorting. The fine powder is sent to the fine powder classifier by the negative pressure air flow. Through the fine powder classifier, the qualified fine powder is selected and sent to the bag filter for collection. The unqualified fine powder is blocked by the rotating blades of the fine powder classifier and returns to the mill for re-pulverization. In the V-type classifier, cold air is sent in to reduce the temperature of the V-type classifier and the fine powder classifier system, thereby reducing the temperature of the cement finished product coming out. The temperature of the cement finished product is low, reducing the absorption of moisture in the air by the cement finished product, thereby avoiding the hydration phenomenon and caking problem of cement in the cement silo.

[0036] The present utility model separates the systems of the mill and the classifier. When cold air is sent into the classifier system, the temperature of the mill system will not be reduced, thus not reducing the pulverization effect and efficiency of the mill; the material after being pulverized by the mill is sent to the V-type classifier through the bucket elevator, and the bucket elevator sends it into the V-type classifier for preliminary sorting. The light fine powder is sent to the fine powder classifier by the air flow, and the heavy material returns to the mill for re-pulverization; the fine powder is sent to the fine powder classifier by the negative pressure air flow. Through the fine powder classifier, the qualified fine powder is selected and sent to the bag filter for collection. The unqualified fine powder is blocked by the rotating blades of the fine powder classifier and returns to the mill for re-pulverization, and the system has high efficiency; in the V-type classifier, cold air is sent in to reduce the temperature of the V-type classifier and the fine powder classifier system. A multi-piece combined baffle electrically adjusted is provided at the inlet of the V-type classifier. According to the operating conditions of the system, the opening degree of the combined baffle at the cold air inlet is adjusted to adjust the cold air intake, the temperature of the cement finished product is low, reducing the absorption of moisture in the air by the cement finished product, thereby avoiding the hydration phenomenon and caking problem of cement in the cement silo.

[0037] The temperature of the cement finished product produced by using the system of the present utility model is reduced by about 16°C, which reduces the absorption of moisture in the air by the cement finished product and avoids the hydration phenomenon and caking in the cement silo.

[0038] The above is only an illustration of the preferred embodiments of the present utility model, and the above technical features can be arbitrarily combined to form multiple embodiment schemes of the present utility model.

[0039] The present utility model has been described exemplarily above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the concept and technical solution of the present utility model, or the concept and technical solution of the present utility model are directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. An efficient and energy-saving vertical mill system for final grinding of cement, comprising a mill and a V-type classifier, characterized in that: It also includes a blast pipe for conveying cold air. The mill and the V-type powder separator are separately arranged. A bucket elevator is correspondingly arranged between the outlet of the mill and the inlet of the V-type powder separator. The blast pipe is communicated with the air inlet of the V-type powder separator.

2. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 1, wherein: The outlet of the mill is a pair of outlets arranged on both sides of the mill. A bucket elevator is arranged corresponding to each side of the outlet. The top of each bucket elevator is connected to the inlet of the V-type powder separator through a pipe.

3. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 1, wherein: The blast pipe is a cold air conveying pipe.

4. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 1, wherein: It also includes a fine powder separator. The air-powder outlet of the V-type powder separator is communicated with the inlet of the fine powder separator.

5. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 1, characterized in that: A temperature sensor and a flow control valve are arranged on the blast pipe.

6. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 1, characterized in that: The pair of outlets are symmetrically arranged on opposite sides of the mill.

7. The high-efficiency and energy-saving vertical mill system for final cement grinding according to claim 3, characterized in that: The air inlet of the V-type powder separator is inclined, and an opening baffle structure with an adjustable angle is arranged corresponding to the air inlet inside the V-type powder separator.

8. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 4, characterized in that: The fine powder separator is a rotary vane separator, and the rotary vane separator is fixedly connected above the V-type powder separator.

9. The high-efficiency and energy-saving vertical mill system for final grinding of cement according to claim 8, characterized in that: Coarse powder outlets are arranged at the bottoms of both the V-type powder separator and the rotary vane separator, and both coarse powder outlets are connected to the cavity of the mill.

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