Cement raw meal grinding system and process

Abstract

The present invention discloses a cement raw material grinding system and process. The cement raw material grinding system includes a first powder classifier, a roller press, a feeding mechanism, and a separation mechanism. The discharge port of the roller press is connected to the first powder classifier, and the ground material enters the first powder classifier for sorting. The discharge port of the first powder classifier is connected to the roller press, and the first material produced after sorting enters the roller press for grinding. The feeding mechanism can selectively convey material to the first powder classifier and / or the roller press. In the present invention, the feeding direction is adjusted according to the humidity of the raw material, and the raw material is conveyed to the first powder classifier and / or the roller press. The amount of material entering the first powder classifier can be adjusted, the powder selection space of the first powder classifier is increased, and the powder selection resistance of the first powder classifier is reduced, thereby effectively improving the powder selection efficiency of the grinding system.

Description

Technical Field

[0001] The present invention relates to the technical field of cement production, and in particular to a cement raw material grinding system and process. Background Art

[0002] Cement raw meal is a basic raw material for cement production, which is made by mixing a variety of raw materials and grinding them to a certain fineness. During the raw meal preparation process, a powder concentrator is set up to screen the raw materials and perform corresponding treatment on the raw materials of different particle sizes screened out. In related technologies, the system directly feeds the powder concentrator. Due to the limited volume of the powder concentrator, it is easy to feed too much and the powder selection resistance is too large, which will lead to uneven distribution of materials in the powder concentrator, poor powder selection efficiency and effect. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a cement raw meal grinding system that can reduce powder selection resistance and improve powder selection efficiency.

[0004] The invention also provides a cement raw material grinding process.

[0005] A cement raw material grinding system according to an embodiment of the first aspect of the present invention comprises:

[0006] The first powder separator is used to separate the materials according to their particle size;

[0007] A roller press is used to grind materials. The discharge port of the roller press is connected to the first powder classifier, so that the ground materials enter the first powder classifier for sorting. The discharge port of the first powder classifier is connected to the roller press, so that the first materials produced after sorting enter the roller press for grinding.

[0008] A feeding mechanism, wherein the first powder classifier and the roller press are both connected to the feeding mechanism, and the feeding mechanism is used to selectively convey materials to the first powder classifier and / or the roller press.

[0009] The cement raw meal grinding system according to the embodiment of the present invention has at least the following beneficial effects:

[0010] The feeding mechanism in the present invention can selectively transport materials to the first powder classifier or roller press. By adjusting the feeding direction, the raw materials are transported to the first powder classifier and / or roller press, and the amount of material entering the first powder classifier can be adjusted, thereby increasing the powder selection space of the first powder classifier and reducing the powder selection resistance of the first powder classifier, thereby effectively improving the powder selection efficiency of the grinding system.

[0011] According to some embodiments of the present invention, the feeding mechanism includes a first feeding channel, a second feeding channel and a feeding valve, the first feeding channel and the second feeding channel are both connected to the feeding valve, the first feeding channel is connected to the roller press, and the second feeding channel is connected to the first powder classifier. The feeding valve is configured so that when the moisture of the raw material is greater than a preset value, the feeding valve is switched to at least connect with the second feeding channel, and when the moisture of the raw material is less than a preset value, the feeding valve is switched to connect with at least the first feeding channel.

[0012] According to some embodiments of the present invention, the cement raw material grinding system also includes a second powder classifier, which is connected downstream of the first powder classifier. The second powder classifier is used to classify materials according to their particle size. The discharge port of the first powder classifier is connected to the second powder classifier, so that the second material produced after the sorting enters the second powder classifier for further sorting. The discharge port of the second powder classifier is connected to the first powder classifier, so that the third material produced after the sorting enters the first powder classifier for sorting.

[0013] According to some embodiments of the present invention, the discharge port of the second powder classifier is connected to the lower part of the first powder classifier.

[0014] According to some embodiments of the present invention, the cement raw material grinding system also includes an air supply module and a separation mechanism, the separation mechanism is connected downstream of the first powder classifier, and is used to separate the fine powder and gas in the second material generated by the first powder classifier, the air supply module includes a circulating fan, a first air supply channel and a second air supply channel, the two ends of the first air supply channel are respectively connected to the circulating fan and the first powder classifier, and the two ends of the second air supply channel are respectively connected to the circulating fan and the second powder classifier, and the circulating fan is used to receive the gas generated from the separation mechanism and transport it to the first air supply channel and the second air supply channel.

[0015] According to some embodiments of the present invention, the lower portion of the first powder classifier is conical, and the first air supply channel is connected to the lower portion of the first powder classifier.

[0016] According to some embodiments of the present invention, the cement raw meal grinding system further includes a flow stabilization bin connected upstream of the roller press, and the feeding mechanism and the first powder classifier are both connected to the flow stabilization bin.

[0017] According to some embodiments of the present invention, the cement raw material grinding system also includes a first conveying machine, a second conveying machine and a dust collector. The first conveying machine and the second conveying machine are both connected between the roller press and the first powder classifier. The first conveying machine is used to convey the ground material to the first powder classifier, and the second conveying machine is used to convey the sorted first material to the stabilizing bin. The dust collector is connected to at least one of the first conveying machine, the second conveying machine, the roller press and the stabilizing bin, and is used to extract dust.

[0018] The cement raw material grinding process according to the second embodiment of the present invention includes:

[0019] Transporting the batched raw materials to the feeding mechanism;

[0020] The feeding mechanism can selectively deliver materials to the first powder classifier and / or the roller press;

[0021] The first powder classifier classifies the material, and the generated first material is conveyed to the roller press for grinding. The roller press grinds the material, and the ground material enters the first powder classifier for classification.

[0022] The cement raw material grinding process according to the embodiment of the present invention has at least the following beneficial effects:

[0023] The cement raw material grinding process of the present invention can adjust the feeding direction, transport the raw materials to the first powder classifier and / or roller press, adjust the amount of material entering the first powder classifier, increase the powder selection space of the first powder classifier, and reduce the powder selection resistance of the first powder classifier, thereby effectively improving the powder selection efficiency of the grinding system.

[0024] According to some embodiments of the present invention, the cement raw material grinding process also includes a secondary sorting step, which includes a second classifier performing secondary sorting on the second material produced by the first classifier, and conveying the fourth material produced by the sorting to a separation mechanism, and conveying the third material to the first classifier; the gas generated by the separation mechanism is passed into the first classifier and the second classifier for air supply.

[0025] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0027] Figure 1 Schematic diagram of a cement raw meal grinding system according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of an embodiment of a feeding mechanism;

[0029] Figure 3 The figure is a flow chart of one embodiment of the cement raw material grinding process of the present invention.

[0030] Reference numerals:

[0031] First powder selector 100; roller press 200; feeding mechanism 300, first feeding channel 310, second feeding channel 320, feeding valve 330; separation mechanism 400; batching module 500; second powder selector 600; air supply module 700, circulating fan 710, first air supply channel 720, second air supply channel 730; steady flow bin 800; dust collection module 900, first conveying machine 910, second conveying machine 920, dust collector 930. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0037] The raw meal grinding system accounts for 65%-75% of total cement production electricity consumption, and grinding costs account for approximately 35% of total cement production costs, making it a critical step in cement production. Traditional raw meal grinding systems feed directly into the classifier. For production lines with low-quality classifiers, the classifier's volume limits classifying efficiency. Due to insufficient separation space within the classifier, overfeeding leads to high internal resistance, uneven material distribution, and low classifying efficiency and effectiveness. Consequently, the industry generally opts for optimizing and upgrading the classifier's internal structure to reduce resistance and improve efficiency. For example, changes to the shape and number of classifier blades are required to lower resistance. However, equipment upgrades and optimizations require significant time and impact the overall system's process layout and civil engineering, resulting in high costs. Furthermore, the upgraded equipment is not compatible with existing construction facilities on some production lines, leaving room for improvement and failing to maximize energy savings.

[0038] For ease of understanding, the relevant contents of this application are explained as follows:

[0039] "Connected to" refers to direct or indirect connection between two components, such as direct connection achieved by the discharge port of one component being directly connected to the feed port of another component, or indirect connection achieved by the discharge port of one component being connected to the feed port of another component through a pipe. Some equipment has one or more feed ports or discharge ports, and different feed ports or discharge ports may allow different types of materials to be introduced. For example, different discharge ports of a powder classifier output fine powder and coarse powder respectively, and different feed ports of a powder classifier may allow materials or gases to be input from different devices to be sorted. When describing "the discharge port of device A supplies the generated material B to enter device C", the discharge port of device A here refers only to the discharge port for material B to pass through.

[0040] The embodiment of the present application provides a cement raw material grinding system (hereinafter referred to as grinding system), referring to Figure 1 and Figure 2The cement raw material grinding system includes a first powder classifier 100, a roller press 200 and a feeding mechanism 300. The feeding mechanism 300 is the feeding structure of the grinding system, which is used to transport the raw materials mixed by the batching mechanism in corresponding proportions to the corresponding equipment for processing; the first powder classifier 100 is used to classify the materials according to their particle size, and to break up and dry the materials. For example, the materials after being sorted by the first powder classifier 100 are divided into first material and second material. The first material is a coarse powder with a larger particle size, and the second material is a fine powder with a smaller particle size. The particle size of the first material is larger than that of the second material; the roller press 200 is used to grind the materials, reduce the particle size of the materials, and form powder. The roller press 200 has obvious energy-saving effect. Compared with grinding methods such as vertical mills, it has lower power consumption indicators and can reduce the overall power consumption of the grinding system.

[0041] In this embodiment, the first powder concentrator 100 and the roller press 200 are both connected to the feeding mechanism 300, and the feeding mechanism 300 is used to selectively convey materials to the first powder concentrator 100 or the roller press 200. In this way, not all of the raw materials to be processed are conveyed to the first powder concentrator 100, but the feeding direction is adjusted according to the actual situation of the raw materials, and the raw materials are conveyed to the first powder concentrator 100 and / or the roller press 200. The amount of material entering the first powder concentrator 100 can be adjusted, the powder selection space of the first powder concentrator 100 is increased, and the powder selection resistance of the first powder concentrator 100 is reduced, thereby effectively improving the powder selection efficiency of the grinding system. The grinding system in this application does not need to change the internal structure, process layout and civil engineering conditions of the equipment. It directly uses the original grinding and sorting equipment in the grinding system, and adjusts the amount of material entering the first powder concentrator 100 by adjusting the feeding direction. The transformation time is short and the economic cost is low.

[0042] It should be noted that the feeding direction of the feeding mechanism 300 can be adjusted based on various parameters of the raw materials being processed, such as raw material particle size, raw material quantity, and raw material humidity. For example, when the raw material particle size is large, the feeding mechanism 300 preferentially feeds the roller press 200; alternatively, when the raw material quantity is large, the feeding mechanism 300 preferentially feeds the roller press to alleviate the separation pressure on the first classifier 100. Because the first classifier 100 has drying and atomizing functions, it can dry materials with high humidity, reducing their viscosity, facilitating material separation during the sorting process, and improving sorting efficiency. Therefore, in this embodiment, the feeding mechanism 300 can adjust the feeding direction based on the raw material humidity. When the raw material humidity is high, the feeding mechanism preferentially feeds the first classifier 100, while when the raw material humidity is low, the feeding mechanism preferentially feeds the roller press 200. The feeding mechanism 300 rationally distributes the raw material direction based on the specific conditions of the raw material, ensuring that the grinding system operates under optimal conditions, thereby reducing power consumption and improving grinding efficiency.

[0043] In addition, in this embodiment, the discharge port of the roller press 200 is connected to the first powder concentrator 100, and the material ground by the roller press 200 can be transmitted to the first powder concentrator 100 for sorting. The discharge port of the first powder concentrator 100 is connected to the roller press 200, and the first material produced after sorting by the first powder concentrator 100 is ground in the roller press 200; therefore, no matter whether the feeding mechanism 300 feeds the first powder concentrator 100 or the roller press 200, the material will undergo the sorting of the first powder concentrator 100 and the grinding of the roller press 200, and the first material will repeatedly enter the roller press 200 for grinding after being sorted by the first powder concentrator 100, and the second material ground to the preset requirements will be output from the first powder concentrator 100. After multiple sorting and grinding, the powder selection of the grinding system is more thorough, the powder selection efficiency is higher, and the fine powder output from the first powder concentrator 100 is more uniform.

[0044] In one embodiment, the feeding mechanism 300 includes a first feeding channel 310, a second feeding channel 320 and a feeding valve 330. The first feeding channel 310 and the second feeding channel 320 are both connected to the feeding valve 330. The grinding system also includes a batching module 500. The batching module 500 mixes different types of raw materials according to a preset ratio, and transports them to the first powder concentrator 100 and the roller press 200 through a conveying machine such as a feeding belt through the feeding valve 330. The first feeding channel 310 is connected to the roller press 200, and the second feeding channel 320 is connected to the first powder concentrator 100. The feeding valve 330 is used to open and close the first feeding channel 310 and the second feeding channel 320 to adjust the feeding direction of the feeding mechanism 300. Specifically, the feeding valve 330 is configured such that, when the humidity of the raw material is greater than a preset value, the feeding valve 330 switches to at least communicate with the second feeding channel 320. At this time, the raw material delivered by the batching module 500 is at least delivered to the first powder concentrator 100, which then disperses and dries the material. When the humidity of the raw material is less than a preset value, the feeding valve 330 switches to at least communicate with the first feeding channel 310. At this time, the raw material delivered by the batching module 500 is at least delivered to the roller press 200, which then grinds the material. In this way, by setting the feeding valve 330 to open and close the first feeding channel 310 and the second feeding channel 320, the feeding direction of the feeding mechanism 300 can be changed, making operation more convenient.

[0045] As will be appreciated, a sensing element and a controller may also be provided within the feeding mechanism 300. The controller and the sensing element, as well as the controller and the feeding valve 330, may be in communication. The sensing element is used to detect the humidity of the raw materials delivered by the batching module 500 and transmit the information to the controller. Based on the sensing element's detection results, the controller sends a command to the feeding valve 330 to change the flow direction or opening of the feeding valve 330. Alternatively, the sensing element may be configured to detect the humidity of the raw materials in real time, enabling the feeding valve 330 to make real-time adjustments based on the current state of the delivered raw materials. Alternatively, the sensing element may employ an intermittent detection method, i.e., the sensing element performs detection actions at preset time intervals.

[0046] It should be noted that the feeding valve 330 is not completely switched to be connected with the first feeding channel 310 or the second feeding channel 320 under different working conditions, that is, the feeding valve 330 has a state of being connected with the first feeding channel 310 or the second feeding channel 320 alone, and a state of being connected with the first feeding channel 310 and the second feeding channel 320 at the same time. Specifically, taking the feeding valve 330 switching working state according to the humidity of the raw material as an example, when the humidity of the raw material is higher than the preset value and the difference is large, the humidity of the raw material is too high, and the feeding valve 330 is switched to be completely connected with the second feeding channel 320, and the feeding mechanism 300 only feeds the first powder concentrator 100, so that the material is first dried and broken up by the first powder concentrator 100 to reduce the humidity of the material; when the humidity of the raw material is lower than the preset value and the difference is large, the humidity of the raw material is too low, and the feeding valve 330 is switched to be completely connected with the first feeding channel 310, and the feeding mechanism 300 only feeds the roller press 200, so that the material is first dried and broken up by the roller press The machine 200 grinds the raw materials to reduce the particle size of the materials; when the humidity of the raw materials is not much different from the preset value, or is within a certain range, the feeding valve 330 is switched to be connected to the first feeding channel 310 and the second feeding channel 320 at the same time. At this time, the feeding mechanism 300 simultaneously conveys materials to the first powder concentrator 100 and the roller press 200. Part of the materials enters the first powder concentrator 100 for drying and breaking up, and part of the materials enters the roller press 200 for grinding. The roller press 200 can bear the sorting pressure of the first powder concentrator 100, so that the first powder concentrator 100 has sufficient powder selection space, thereby improving the powder selection efficiency of the first powder concentrator 100.

[0047] In addition, in the case where the feeding structure feeds the first powder concentrator 100 and the roller press 200 at the same time, the opening of the feeding valve 330 at the first feeding channel 310 and the second feeding channel 320 can also be adjusted according to the current humidity of the raw materials and the working conditions of the first powder concentrator 100 and the roller press 200 to change the feeding amount to the first powder concentrator 100 and the roller press 200. For example, when the moisture content of the raw material is slightly greater than a preset value, the opening of the feeding valve 330 at the second feeding channel 320 is appropriately increased to allow more material to enter the first powder concentrator 100 for breaking up and drying first; when the moisture content of the raw material is slightly less than a preset value, the opening of the feeding valve 330 at the first feeding channel 310 is appropriately increased to allow more feed to enter the roller press 200 for grinding first; when the first powder concentrator 100 is close to the rated working state and the roller press 200 has a grinding margin, the opening of the feeding valve 330 at the first feeding channel 310 is appropriately increased to allow more material to enter the roller press 200, thereby alleviating the powder selection pressure of the first powder concentrator 100. Similarly, when the roller press 200 is close to the rated working state and the first powder concentrator 100 has a powder selection margin, the opening of the feeding valve 330 at the second feeding channel 320 is appropriately increased to allow more material to enter the first powder concentrator 100, thereby alleviating the grinding pressure of the roller press 200.

[0048] The grinding system also includes a second powder classifier 600, which is connected to the downstream of the first powder classifier 100. The second powder classifier 600 can classify the material according to the particle size of the material. The second powder classifier 600 is located downstream of the first powder classifier 100, and the discharge port of the first powder classifier 100 is connected to the second powder classifier 600. The second material generated by the classification of the material by the first powder classifier 100 enters the second powder classifier 600 for further classification. The second material generated by the first powder classifier 100 may be mixed with large-particle materials. Multiple classification of the second material can improve the powder selection efficiency of the grinding system. In addition, after the second powder classifier 6 00 The materials after sorting are divided into the third material and the fourth material. The third material is a coarse powder with a larger particle size, and the fourth material is a fine powder with a smaller particle size. The particle size of the third material is larger than that of the fourth material. The discharge port of the second powder selector 600 is connected to the first powder selector 100, so that the third material produced by the sorting of the second powder selector 600 can enter the first powder selector 100 for further sorting. There is a possibility that small-sized materials are mixed in the third material produced by the second powder selector 600. Multiple sorting of the third material can make the material sorting more thorough, and the fine powder selected by the second powder selector 600 is more uniform, thereby improving the quality of the raw material and the powder selection efficiency.

[0049] It can be understood that the discharge port of the first powder classifier 100 is connected to the feed port of the second powder classifier 600 through a pipeline. At the same time, the discharge port of the second powder classifier 600 is connected to the feed port of the first powder classifier 100 through a pipeline to facilitate material transportation.

[0050] When the first powder classifier 100 and the second powder classifier 600 are in working condition, high-temperature airflow is introduced into the inside. The materials entering the first powder classifier 100 and the second powder classifier 600 are broken up and dried under the action of the high-temperature airflow. Under the action of the gravity of the materials themselves and the guidance of the internal structure of the powder classifier, materials of different particle sizes are separated. As the air flow continues to flow in the first powder classifier 100, the flow rate and pressure of the air flow gradually decrease, and the air flow at the lower part of the first powder classifier 100 is relatively weak. Therefore, the discharge port of the second powder classifier 600 is connected to the lower part of the first powder classifier 100. On the one hand, the air flow in the second powder classifier 600 is introduced into the first powder classifier 100 to increase the air flow in the first powder classifier 100. On the other hand, the third material in the second powder classifier 600 is directly introduced into the lower part of the first powder classifier 100. Since the particle size of the third material generated by the second powder classifier 600 is relatively small, under the action of the air flow, the smaller particle size material in the third material is quickly separated from the larger particle size material, thereby improving the powder selection efficiency of the grinding system and reducing the circulation load of the system.

[0051] The grinding system also includes an air supply module 700 and a separation mechanism 400. The separation mechanism 400 is used to separate gas and material, so as to separate the gas and fine powder in the material. The fine powder finally formed is stored in the warehouse, and the gas is further processed. The separation mechanism 400 is connected to the downstream of the first powder concentrator 100. The separation mechanism 400 can be selected as a cyclone. The separation mechanism 400 receives the material transmitted from the upstream and performs gas-powder separation. The material transmitted from the upstream can be the second material directly produced by the first powder concentrator 100, or it can be a fine material produced by other equipment located between the first powder concentrator 100 and the separation mechanism 400. The separation mechanism 400 separates the fine powder from the gas in the material, and the fine powder can be stored in the finished product warehouse through a chute. In one embodiment of the present application, the separation mechanism 400 receives the fourth material produced by the second powder concentrator 600 and performs gas-powder separation. The air supply module 700 includes a circulating fan 710, a first air supply channel 720 and a second air supply channel 730. The two ends of the first air supply channel 720 are respectively connected to the circulating fan 710 and the first powder classifier 100, and the two ends of the second air supply channel 730 are respectively connected to the circulating fan 710 and the second powder classifier 600. The circulating fan 710 is used to receive the gas generated from the separation mechanism 400 and transport the gas to the first air supply channel 720 and the second air supply channel 730 to supply air to the first powder classifier 100 and the second powder classifier 600, thereby increasing the air flow rate and pressure in the first powder classifier 100 and the second powder classifier 600, and improving the powder selection efficiency of the grinding system.

[0052] It is understood that a valve may be further provided in the air supply module 700 and connected to the first air supply channel 720 and the second air supply channel 730 so that the valve controls the opening and closing of the first air supply channel 720 and the second air supply channel 730. The air supply module 700 can selectively supply gas to the first air supply channel 720, the second air supply channel 730, or both of them. In addition, the first air supply channel 720 may be provided with multiple branches, and the branches may be connected to different positions of the first powder concentrator 100. For example, two branches may be provided, and the two branches may be connected to the upper and lower parts of the first powder concentrator 100, respectively, so as to simultaneously supply air to the upper and lower parts of the first powder concentrator 100.

[0053] Furthermore, the lower part of the first powder classifier 100 is conical, so that the first material is guided by the first powder classifier 100 and rolls downward step by step, which facilitates the separation of the first material and the second material; due to the conical shape, the lower space of the first powder classifier 100 is reduced, which restricts the airflow in the lower space of the first powder classifier 100 and affects the sorting efficiency. Based on this, in this embodiment, the first air supply channel 720 is connected to the lower part of the first powder classifier 100 to increase the airflow in the lower part of the first powder classifier 100 and improve the powder selection efficiency of the first powder classifier 100; and, the third material generated by the second powder classifier 600 is passed into the lower part of the first powder classifier 100, and the third material is directly affected by the airflow passed into the lower part of the first powder classifier 100 and is quickly separated, which can further improve the powder selection efficiency of the first powder classifier 100.

[0054] The grinding system also includes a stabilizing bin 800, which is connected to the upstream of the roller press 200. The feeding mechanism 300 and the first powder selector 100 are both connected to the stabilizing bin 800. Specifically, one end of the first feeding channel 310 is connected to the feeding valve 330, and the other end is connected to the stabilizing bin 800. The stabilizing bin 800 is connected to the roller press 200 through a pipeline and transports materials to the roller press 200. The materials entering the stabilizing bin 800 through the feeding mechanism 300 are mixed evenly in the stabilizing bin 800, which facilitates the roller press 200 to grind the materials. In addition, the first material after sorting by the first powder selector 100 is first transported to the stabilizing bin 800, and after being mixed evenly in the stabilizing bin 800, it enters the roller press 200 for grinding, so that the grinding of the material is more thorough.

[0055] A slide conveyor may be provided on the flow stabilizing bin 800 to ensure that the material is distributed more evenly before entering the flow stabilizing bin 800 .

[0056] The grinding system also includes a dust collection module 900, which includes a first conveying mechanism 910, a second conveying mechanism 920 and a dust collector 930. The first conveying mechanism 910 and the second conveying mechanism 920 are both connected between the roller press 200 and the first powder concentrator 100. The first conveying mechanism 910 and the second conveying mechanism 920 can both be selected as bucket elevators, wherein the first conveying mechanism 910 is located downstream of the roller press 200 and is used to convey the material ground by the roller press 200 to the first powder concentrator 100. The second conveying mechanism 920 is located downstream of the first powder concentrator 100 and is used to convey the first material sorted by the first powder concentrator 100 to the stabilizing bin 800, and then conveyed to the roller press 200 for grinding through the stabilizing bin 800. The dust collector 930 is connected to at least one of the first conveying mechanism 910, the second conveying mechanism 920, the roller press 200 and the stabilizing bin 800, and is used to extract dust. The traditional grinding system directly uses the airflow inside the system to collect dust. For example, the airflow provided by the kiln system enters the grinding system, providing a high-temperature airflow for the classifier to select powder, and uses the high-temperature airflow to form a negative pressure in the above-mentioned machine to collect dust. This method is likely to cause fluctuations in the air and material in the system, and cause dust to escape due to insufficient negative pressure, posing a safety hazard. In this application, a dust collector 930 is set up separately to form an independent dust collection system, which provides sufficient negative pressure for the dust collection of each machine, and will not affect the air and material inside the system, and can prevent dust from escaping, reducing safety hazards.

[0057] like Figure 3 , this application also provides a cement raw material grinding process (hereinafter referred to as grinding process), comprising the following steps:

[0058] S100: The batched raw materials are conveyed to the feeding mechanism 300; S200: The feeding mechanism 300 can optionally convey materials to the first powder concentrator 100 and / or the roller press 200; S300: The material entering the first powder concentrator 100 is sorted by the first powder concentrator 100, and the resulting first material is conveyed to the roller press 200 for grinding. The material entering the roller press 200 is ground by the roller press 200 and then enters the first powder concentrator 100 for sorting. The grinding process in this embodiment can adjust the feeding direction, convey the raw materials to the first powder concentrator 100 and / or the roller press 200, and adjust the amount of material entering the first powder concentrator 100, thereby increasing the powder selection space of the first powder concentrator 100 and reducing the powder selection resistance of the first powder concentrator 100, thereby effectively improving the powder selection efficiency of the grinding system.

[0059] It should be noted that a separation mechanism 400 can be provided to separate the gas and fine powder in the material. The material entering the separation mechanism 400 can be the second material directly produced by the first classifier 100 or a fine material produced by other equipment. Specifically, the grinding process also includes a secondary sorting step, which includes secondary sorting of the second material produced by the first classifier 100 by the second classifier 600, and conveying the fourth material produced by the sorting to the separation mechanism 400. The third material produced by the sorting is conveyed to the first classifier 100, and the gas generated by the separation mechanism 400 is passed into the first classifier 100 and the second classifier 600 for air supply. The secondary sorting and the air supply to the first classifier 100 and the second classifier 600 can improve the powder selection efficiency of the grinding process.

[0060] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. Cement raw meal grinding system, characterized by: include: The first powder separator is used to separate the materials according to their particle size; A roller press is used to grind materials. The discharge port of the roller press is connected to the first powder classifier, so that the ground materials enter the first powder classifier for sorting. The discharge port of the first powder classifier is connected to the roller press, so that the first materials produced after sorting enter the roller press for grinding. A feeding mechanism, wherein the first powder classifier and the roller press are both connected to the feeding mechanism, and the feeding mechanism is used to selectively convey materials to the first powder classifier and / or the roller press; the feeding mechanism includes a first feeding channel, a second feeding channel and a feeding valve, and the first feeding channel and the second feeding channel are both connected to the feeding valve, the first feeding channel is connected to the roller press, and the second feeding channel is connected to the first powder classifier, and the feeding valve is configured such that when the humidity of the raw material is greater than a preset value, the feeding valve is switched to at least communicate with the second feeding channel, when the humidity of the raw material is less than a preset value, the feeding valve is switched to communicate with at least the first feeding channel, and when the humidity of the raw material is within a range, the feeding valve is switched to communicate with the first feeding channel and the second feeding channel at the same time.

2. The cement raw meal grinding system according to claim 1, characterized in that: The cement raw material grinding system also includes a second powder classifier, which is connected downstream of the first powder classifier. The second powder classifier is used to classify materials according to their particle size. The discharge port of the first powder classifier is connected to the second powder classifier, so that the second material produced after the classification can enter the second powder classifier for further classification. The discharge port of the second powder classifier is connected to the first powder classifier, so that the third material produced after the classification can enter the first powder classifier for classification.

3. The cement raw meal grinding system according to claim 2, characterized in that: The discharge port of the second powder classifier is connected to the lower part of the first powder classifier.

4. The cement raw meal grinding system according to claim 2, characterized in that: The cement raw material grinding system also includes an air supply module and a separation mechanism. The separation mechanism is connected downstream of the first powder classifier and is used to separate the fine powder and gas in the second material generated by the first powder classifier. The air supply module includes a circulating fan, a first air supply channel and a second air supply channel. The two ends of the first air supply channel are respectively connected to the circulating fan and the first powder classifier, and the two ends of the second air supply channel are respectively connected to the circulating fan and the second powder classifier. The circulating fan is used to receive the gas generated from the separation mechanism and transport it to the first air supply channel and the second air supply channel.

5. The cement raw meal grinding system according to claim 4, characterized in that: The lower part of the first powder classifier is conical, and the first air supply channel is connected to the lower part of the first powder classifier.

6. The cement raw meal grinding system according to claim 1, characterized in that: The cement raw material grinding system further includes a flow stabilizing bin connected to the upstream of the roller press, and the feeding mechanism and the first powder classifier are both connected to the flow stabilizing bin.

7. The cement raw meal grinding system according to claim 6, characterized in that: The cement raw material grinding system also includes a first conveying machine, a second conveying machine and a dust collector. The first conveying machine and the second conveying machine are both connected between the roller press and the first powder classifier. The first conveying machine is used to convey the ground material to the first powder classifier, and the second conveying machine is used to convey the sorted first material to the stabilizing bin. The dust collector is connected to at least one of the first conveying machine, the second conveying machine, the roller press and the stabilizing bin, and is used to extract dust.

8. A cement raw material grinding process, characterized in that: include: Transporting the batched raw materials to the feeding mechanism; The feeding mechanism can selectively feed materials to the first powder concentrator and / or the roller press; when the moisture content of the raw material is greater than a preset value, the feeding mechanism feeds the materials to the first powder concentrator; when the moisture content of the raw material is lower than a preset value, the feeding mechanism feeds the materials to the roller press; when the moisture content of the raw material is within a certain range, the feeding mechanism feeds the materials to both the first powder concentrator and the roller press; The first powder classifier classifies the material, and the generated first material is conveyed to the roller press for grinding. The roller press grinds the material, and the ground material enters the first powder classifier for classification.

9. The cement raw material grinding process according to claim 8, characterized in that: The cement raw material grinding process also includes a secondary sorting step, which includes a second classifier performing secondary sorting on the second material produced by the first classifier, and conveying the fourth material produced by the sorting to a separation mechanism, and conveying the third material to the first classifier; the gas produced by the separation mechanism is passed into the first classifier and the second classifier for air supply.

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