CN204816701U - Novel material grinding system - Google Patents

Abstract

The utility model relates to a novel material grinding system especially relates to an upright mill grinding system who is used for preparing raw materials or cement, grind material conveyor, lifting machine, gather dust and waste gas treatment system including feeding device, upright mill, play, the utility model discloses well adoption realizes tentatively drying to the material at the hot -blast whereabouts material in -process that passes from grinding lower part air inlet mode immediately, avoids the moisture of material to cause the influence to promoting to carry greatly, the high -efficient separator that sets up in this system constitutes integratively with standing to grind, and structural style is equitable, arranges the compactness, high -efficient separator collect for dry, material roughly select hierarchical, the material is choice hierarchical in an organic whole, reduces the grinding power consumption.

Description

New Material Grinding System

technical field

The utility model relates to a novel material grinding system, in particular to a vertical mill grinding system for preparing raw materials or cement.

Background technique

In the production of the cement industry, the grinding process is the process that consumes the most energy. Under the fierce market competition and urgent energy-saving pressure, the grinding energy-saving technology and energy-saving measures are constantly innovating and developing. In the material grinding section of the cement industry, the grinding technology of roller mills, especially vertical mills, has been successfully and rapidly promoted. The reasonable working principle of the material bed makes it have a broad application prospect. However, judging from the actual effect of most of the vertical mill grinding systems that have been used so far, the vertical mill still has the following problems in the grinding process system.

First of all, the air flow nozzle ring installed inside the traditional vertical mill, after the air flow passes through the nozzle ring, the wind speed is too high, as high as 60-90m/s. The local resistance and the resistance along the way of lifting the material cause a large loss, resulting in a large loss of airflow resistance of the entire vertical mill; at the same time, in order to lift the material, the vertical mill is required to have a high working air volume, resulting in a large overall power consumption of the circulating fan.

Secondly, for ordinary external circulation material bed grinding equipment and systems (such as roller presses, etc.), placing the powder selection and grading system outside will result in a large system equipment, and it is necessary to set up a steady flow bin and a certain height of the slide to form a certain At the same time, the structural layout of the powder selection device and the grinding device is not compact, which increases the manufacturing cost and civil construction cost.

Thirdly, the existing vertical mills include a grinding device that directly enters the separator from the middle and upper part of the vertical mill; the drying hot air directly enters the separator, and only the materials entering the separator are dried. , When the material moisture is high, the material cannot be completely dried, and the wet material will be blocked at the inlet and outlet of the mill elevator, resulting in poor adaptability of the system to the material and affecting the normal operation of the entire system.

Utility model content

The utility model proposes a novel material grinding implementation system aimed at the above related problems of material bed grinding. The grinding adopts the external circulation grinding process, and all the materials in the system are mechanically lifted, which reduces the energy consumption of material transportation, and at the same time reduces the erosion and wear of the grinding rollers by the high-speed dust-laden airflow.

In order to solve the above-mentioned technical problems, the utility model is realized as follows: a new type of material grinding system is designed, including a feeding device, a vertical mill, a material delivery device for grinding, a hoist, dust collection and waste gas treatment system;

It is characterized in that: the vertical mill is composed of a material inlet, a vertical mill air inlet, a grinding table, a high-efficiency separator, a high-efficiency separator inlet, and a high-efficiency separator air outlet; the material inlet is located at the high-efficiency separation In the lower part of the vertical mill, the air inlet of the vertical mill is located on the outer casing of the vertical mill below the grinding table; the high-efficiency separator is located in the upper part of the vertical mill, and the feed inlet of the high-efficiency separator and the air outlet of the high-efficiency separator are located in the upper part of the high-efficiency separator.

The feeding device is connected to the fresh material inlet of the vertical mill, and the two sides of the grinding table in the vertical mill are provided with low-speed nozzle rings, and the wind speed of the nozzle ring is not greater than 30m/s, and the lower part of the discharge method is adopted to discharge the material, and the vertical The outlet of the mill is connected with the material conveying device, the outlet of the material conveying device is connected with the inlet of the elevator, the outlet of the elevator is connected with the inlet of the high-efficiency separator, and the high-efficiency separator adopts the form of spreading materials from the upper part; the air inlet of the vertical mill It is connected to the hot air pipe from the drying heat source or directly connected to the cold air pipe, and the air outlet of the high-efficiency separator is connected to the exhaust gas treatment system.

As an improvement of the utility model, according to the characteristics of the material to be ground, when it is used for grinding raw material, since the material to be ground may contain large pieces of material, the outlet of the elevator is provided with a vibrating screening device , The coarse powder outlet of the vibrating screening device is connected to the feed port of the vertical mill, and the fine powder outlet of the vibrating screening device is connected to the feeding port of the high-efficiency separator. The bulk material is screened out and directly enters the vertical mill without passing through the high-efficiency separator, and is circulated in the vertical mill until the particle size becomes smaller.

As an improvement of the utility model, an iron remover is installed on the conveying device of the grinding material to remove the magnetic metal substances pulverized from the bulk material. The conveying device for the grinding material is a belt conveyor, a vibrating feeder or a discharge chute.

As a further optimized implementation of the present utility model, the number of feeding ports of the high-efficiency separator is set to be three or more, and each feeding port is above the spreading plate and arranged uniformly in the circumferential direction. Especially when the amount of material fed to the high-efficiency separator is large, the material spreading device is set to multi-point uniform feeding and material spreading, and the material spreading effect is better, which is beneficial to the powder selection of the high-efficiency separator.

As an improvement of the utility model, the feeding device is a belt conveyor, a hoist or a combination of the two.

The material grinding system described in the utility model adopts the external circulation grinding process, and the material is lifted mechanically, which reduces the energy consumption of material transportation and unit product energy consumption. During the material process, the material is preliminarily dried to avoid the impact of the high moisture content of the material on the lifting and conveying. In addition, a vibrating screening device can be installed at the outlet of the elevator according to the characteristics of the material particle size, so that the system is more applicable to the material.

The positive effect of the utility model:

The utility model adopts the air intake method from the lower part of the vertical mill, and realizes the preliminary drying of the material during the process of the hot air passing through the falling material, so as to avoid the influence of the high moisture content of the material on the lifting and conveying; the high-efficiency separator set in the system and the vertical The mill is integrated, the structure is reasonable, and the layout is compact. The high-efficiency separator integrates material drying, material roughing and classification, and material selection and classification, reducing the power consumption of grinding. Specifically include the following aspects:

1. The external circulation vertical mill grinding process is adopted to give full play to the advantages of material bed grinding. At the same time, the material is lifted and transported to the high-efficiency separator by external circulation, which is more energy-saving than the existing pneumatic lifting, thereby reducing the unit energy consumption of the product and at the same time It prevents the erosion and wear of the grinding roller by the high-speed dusty airflow, which is beneficial to prolong the service life of the equipment.

2. Adopt the way of air intake from the lower part of the vertical mill. The hot air can realize the preliminary drying of the material during the process of passing through the falling material, so as to avoid the influence of the high moisture content of the material on the lifting and conveying, and improve the applicability of the system to the material.

3. The high-efficiency separator set in the system is self-contained with the vertical mill, with a reasonable structure and compact layout. The high-efficiency separator integrates material drying, rough selection and classification, and fine classification. Dispersion, further improving the sorting efficiency and reducing the power consumption of grinding.

Description of drawings

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific implementation methods and accompanying drawings. Here, the exemplary implementation of the utility model and its description are used to explain the utility model, but not as a limitation to the utility model.

Fig. 1 is the technological process schematic diagram of the present utility model.

Fig. 2 is a schematic diagram of an improved technological process of the present invention.

Fig. 3 is a schematic diagram of another improved technological process of the present invention.

In the figure, 1 feeding device 2 vertical mill 2-1 material inlet

2-2 vertical mill air inlet 2-3 grinding disc 2-4 high-efficiency separator

2-5 high-efficiency separator feed port 2-6 high-efficiency separator air outlet

3 Out of the grinding material conveying device 4 Elevator

5 Dust collection and waste gas treatment system 6 Iron remover

7 vibrating screening device

Detailed ways

As shown in Figure 1, the new material grinding system described in the utility model includes a feeding device 1, a vertical mill 2, a grinding material conveying device 3, a hoist 4, a dust collection and waste gas treatment system 5; it is characterized in that: The vertical mill 2 is composed of a material feed port 2-1, a vertical mill air inlet 2-2, a grinding disc 2-3, a high-efficiency separator 2-4, a high-efficiency separator feed port 2-5, and a high-efficiency separator air outlet 2-6, etc.; the material feed port 2-1 is located at the bottom of the high-efficiency separator 2-4, and the vertical mill air inlet 2-2 is located on the vertical mill outer shell below the grinding disc 2-3; the The high-efficiency separator 2-4 is located on the upper part of the vertical mill 2, and the high-efficiency separator feed port 2-5 and the high-efficiency separator air outlet 2-6 are located on the upper part of the high-efficiency separator 2-4.

The feeding device 1 is connected to the fresh material feed port 2-1 of the vertical mill 2, and the two sides of the millstone 2-3 in the vertical mill 2 are provided with a low-wind speed nozzle ring, and the wind speed of the nozzle ring is not more than 30m/s, and the vertical The mill adopts the discharge method of the lower part of the material. The vertical mill 2 outlet is connected to the mill material conveying device 3, the mill material conveying device 3 outlet is connected to the elevator 4 inlet, and the elevator 4 outlet is fed to the high-efficiency separator. The outlets 2-5 are connected, and the high-efficiency separator 2-4 adopts the form of upper material spreading; the air inlet 2-2 of the vertical mill is connected with the hot air pipe from the drying heat source or directly connected with the cold air pipe, and the air outlet 2-6 of the high-efficiency separator is connected with the The exhaust gas treatment system 5 is connected.

The high-efficiency separator 2-4 integrates material drying, rough selection and classification, and selection and classification, and is integrated with the vertical mill. The high-efficiency separator 2-4 has no independent air inlet. When the wind entering the vertical mill 2 passes between the shell of the vertical mill 2 and the grinding disc, it conducts a preliminary heat exchange with the material scraped off the grinding disc to realize the preliminary drying of the material. After heat exchange, the hot air enters the high-efficiency separator 2- 4, and then realize the powder selection and drying of the vertical mill material in the high-efficiency separator 2-4.

As an improvement of the utility model, as shown in Figure 2, the iron remover 6 is installed on the material conveying device 3 to remove the magnetic metal substances pulverized from the bulk material, which is conducive to the stable operation of the vertical mill and effectively avoids the The damage to the wear-resistant material of the vertical mill prolongs the service life of the grinding device.

As an improvement of the present utility model, as shown in Figure 3, according to the characteristics of the material to be ground, when used for grinding raw material, since the material to be ground may contain large pieces of material, the hoist 4 The outlet is provided with a vibrating screening device 7, the coarse powder outlet of the vibrating screening device 7 is connected to the feed port 2-1 of the vertical mill, and the fine powder outlet of the vibrating screening device 7 is connected to the feed port 2-5 of the high-efficiency separator. The bulk material is screened out and directly enters the vertical mill without passing through the high-efficiency separator, and is circulated in the vertical mill until the particle size becomes smaller.

As a further optimized embodiment of the present utility model, the number of feeding ports 2-5 of the high-efficiency separator is three or more, and each feeding port is above the spreading plate and arranged uniformly in the circumferential direction. Especially when the amount of material fed to the high-efficiency separator 2-4 is large, the material spreading device is set to multi-point uniform feeding and material spreading, and the material spreading effect is better, which is beneficial to the powder selection of the high-efficiency separator 2-4.

As another improvement of the utility model, the feeding device 1 is a belt conveyor, a hoist or a combination of the two.

Claims (5)

1. a novel material grinding system, comprises drawing-in device (1), Vertical Mill (2), goes out grind materials conveying device (3), elevator (4), to gather dust and exhaust treatment system (5); It is characterized in that: described Vertical Mill (2) is made up of material feeding mouth (2-1), Vertical Mill air inlet (2-2), mill (2-3), efficient cyclone (2-4), efficient cyclone charging aperture (2-5) and efficient cyclone air outlet (2-6); Described material feeding mouth (2-1) is positioned at efficient cyclone (2-4) bottom, mill (2-3) top; Mill (2-3) both sides are also provided with low wind speed nozzle ring; Vertical Mill air inlet (2-2) is positioned on Vertical Mill (2) shell body of mill (2-3) below; Efficient cyclone (2-4) is positioned at Vertical Mill (2) top, and efficient cyclone charging aperture (2-5) and efficient cyclone air outlet (2-6) are positioned at efficient cyclone (2-4) top; Drawing-in device (1) is connected with material feeding mouth (2-1), Vertical Mill (2) discharging opening with go out grind materials conveying device (3) and be connected, go out grind materials conveying device (3) outlet to be connected with elevator (4) import, elevator (4) outlet is connected with efficient cyclone charging aperture (2-5), and efficient cyclone (2-4) top arranges spreading disk; Efficient cyclone air outlet (2-6) is connected with exhaust treatment system (5).

2. novel material grinding system as claimed in claim 1, it is characterized in that: described in go out that grind materials conveying device (3) is ribbon conveyer, vibratory feeder or discharging scraper-trough conveyer, go out in grind materials conveying device (3) and tramp iron separator (6) be set.

3. novel material grinding system as claimed in claim 1, is characterized in that: described efficient cyclone charging aperture (2-5) quantity is more than three or three, and each charging aperture is above spreading disk and circumferentially to being evenly arranged.

4. novel material grinding system as claimed in claim 1, it is characterized in that: described elevator (4) exit is provided with oscillatory type screening plant (7), oscillatory type screening plant (7) outlet has two places, and a place is meal outlet, and another place is fine powder outlet; Described meal outlet is connected with Vertical Mill charging aperture (2-1), and described fine powder outlet is connected with efficient cyclone charging aperture (2-5).

5. novel material grinding system as claimed in claim 1, is characterized in that: described drawing-in device (1) is ribbon conveyer, the device of elevator or both combinations.