A coal slurry rod mill drum screen blow cleaning device

Abstract

The utility model discloses a kind of coal slurry rod mill drum screen blow cleaning device, belong to coal slurry preparation equipment technical field, including rod mill, the drum screen of its discharge end, the screening and collecting assembly located below drum screen, the protective housing of cover drum screen, blow cleaning mechanism and control unit;Blow cleaning mechanism contains high-pressure spray head, gas pipeline and gas source control valve, gas pipeline is connected high-pressure spray head with parallel factory high-pressure air pipe network and air compressor;Control unit controls gas source opening and closing.The utility model uses above-mentioned a kind of coal slurry rod mill drum screen blow cleaning device, by high-pressure gas purging replaces water washing, can effectively blow off the large particle impurities attached to drum screen mesh, guarantee mesh unobstructed;Prevent moisture from entering coal slurry system, stabilize coal slurry concentration, reduce system fluctuation;Double-path gas source ensures supply stability, saves water resources, prolongs equipment operation cycle, with significant practical value.

Description

Technical Field

[0001] This utility model relates to the technical field of coal slurry preparation equipment, and in particular to a coal slurry rod mill drum screen cleaning device. Background Technology

[0002] In chemical production, the drum screen of a coal slurry rod mill is a key component for separating fine slurry from large particulate impurities in coal slurry. The unobstructed flow of the screen directly affects the stability of the coal slurry concentration and the safe operation of the production system. To prevent clogging of the drum screen, which can lead to problems such as slurry leakage and misjudgment of coal slurry concentration, the drum screen is typically cleaned by periodically flushing it with water.

[0003] However, the above-mentioned water washing method has obvious drawbacks: the flushing water will directly enter the coal slurry system, causing excessive fluctuations in the coal slurry concentration, which in turn leads to unstable furnace conditions; at the same time, the consumption of a large amount of primary water causes water waste, and frequent water washing operations will shorten the stable operation cycle of the equipment and increase the consumption of raw coal, which will have an adverse impact on production efficiency and cost control.

[0004] Therefore, there is an urgent need for a cleaning device that can effectively ensure the smooth flow of the drum screen, avoid the influence of external media (such as flushing water) on the coal slurry concentration, and save water resources, so as to solve the problems of coal slurry concentration fluctuation, poor system stability, and resource waste in the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a cleaning device for a drum screen of a coal slurry bar mill to solve the above-mentioned problems.

[0006] This utility model provides a cleaning device for a rotary drum screen of a coal slurry bar mill, comprising: A rod mill, which has a discharge end; A rotary screen is installed at the discharge end of the rod mill; A screening and collection assembly, located below the drum screen, is used to separate and collect qualified materials from waste materials on the screen. A protective outer shell is fitted over the outside of the drum screen and connected to the screening and collecting assembly; The cleaning mechanism includes a high-pressure nozzle, an air supply pipeline, an air source control valve, and an air source supply device. The high-pressure nozzle is disposed between the protective shell and the drum screen. The air supply pipeline passes through the top wall of the protective shell and connects the high-pressure nozzle and the air source supply device. The control unit is electrically connected to the gas source control valve and the gas source supply device to control their opening and closing.

[0007] Preferably, in the above-mentioned coal slurry bar mill drum screen cleaning device, the screening and collection assembly includes a qualified hopper and a waste hopper located below the drum screen. The qualified hopper is used to collect and convey fine slurry, and the waste hopper is used to collect and convey large particles screened out.

[0008] Preferably, in the above-mentioned coal slurry bar mill drum screen cleaning device, the air supply device includes a factory high-pressure air pipeline network and an air compressor; the factory high-pressure air pipeline network and the air compressor are connected in parallel with the air transmission pipeline through branch pipelines.

[0009] Preferably, in the above-mentioned coal slurry rod mill drum screen cleaning device, a pipeline control valve and an air compressor outlet valve are respectively provided on the branch pipeline. The pipeline control valve and the factory high-pressure air pipeline are set in the same branch pipeline, and the air compressor outlet valve and the air compressor are set in the same branch pipeline.

[0010] Preferably, in the above-mentioned coal slurry bar mill drum screen cleaning device, a cleaning valve is provided on the gas supply pipeline, and the cleaning valve is electrically connected to the control unit.

[0011] Preferably, in the above-mentioned coal slurry bar mill drum screen cleaning device, the high-pressure nozzles are arranged at intervals along the axial direction of the drum screen, and the number is 5-8.

[0012] Preferably, in the above-mentioned coal slurry bar mill drum screen cleaning device, the distance between the high-pressure nozzle and the outer wall of the drum screen is 3-5 cm.

[0013] Therefore, the present invention employs the above-mentioned coal slurry bar mill drum screen cleaning device, which has the following beneficial effects: (1) High-pressure gas purging is used to replace the traditional water washing method, which eliminates the entry of primary water into the coal slurry system, fundamentally avoids the fluctuation of coal slurry concentration caused by external water, effectively reduces system fluctuation problems such as unstable furnace conditions, and ensures long-term stable operation of the production system.

[0014] (2) By setting multiple high-pressure nozzles between the protective shell and the drum screen, the impurities attached to the drum screen can be blown away accurately and efficiently, ensuring that the drum screen is always unobstructed, avoiding the problem of mill slurry running or screening failure caused by blockage, and improving screening efficiency.

[0015] (3) Using high-pressure air from the factory or high-pressure gas provided by an air compressor as the cleaning medium completely replaces the traditional single-pass water rinsing, significantly reducing water consumption and reducing resource waste in the production process, which meets the production needs of energy conservation and consumption reduction.

[0016] (4) The protective outer shell is set outside the drum screen, providing a relatively enclosed space for high-pressure purging and reducing the impact of impurity splashing on the surrounding environment; the air supply device adopts a dual-circuit design with the factory high-pressure air pipeline network and air compressor connected in parallel. With the control valve on the branch pipeline, it can automatically switch to the backup air source when the main air source fails, ensuring uninterrupted purging operation and further improving the operational reliability of the device.

[0017] (5) By using stable high-pressure gas to clean the screen, wear caused by screen blockage or water washing corrosion is reduced, the service life of the drum screen and related components is extended, the frequency and cost of equipment maintenance are reduced, and the long-term stable operation of the production equipment is achieved.

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the cleaning device in an embodiment of the cleaning device for a coal slurry bar mill drum screen according to this utility model.

[0020] Reference numerals: 1. Rod mill; 2. Rotary drum screen; 3. Protective housing; 4. Cleaning mechanism; 41. High-pressure nozzle; 42. Air pipeline; 43. High-pressure air pipeline network; 44. Air compressor; 45. Pipeline control valve; 46. Air compressor outlet valve; 5. Qualified hopper; 6. Waste hopper; 7. Cleaning valve. Detailed Implementation

[0021] To better understand the above technical solutions, a detailed description of the solutions will be provided below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “the,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0023] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0024] This utility model provides a cleaning device for a rotary drum screen of a coal slurry bar mill, comprising: Rod mill 1, which has a discharge end; A rotary screen 2 is installed at the discharge end of the rod mill 1; The screening and collection assembly is located below the drum screen 2 and is used to separate and collect qualified materials from waste materials on the screen. The protective outer shell 3 is fitted over the outside of the drum screen 2 and is connected to the screening and collecting assembly; The cleaning mechanism 4 includes a high-pressure nozzle 41, an air supply pipe 42, an air source control valve, and an air source supply device. The high-pressure nozzle 41 is disposed between the protective shell 3 and the drum screen 2. The air supply pipe 42 passes through the top wall of the protective shell 3 and connects the high-pressure nozzle 41 with the air source supply device. The control unit is electrically connected to the gas source control valve and the gas source supply device to control their opening and closing.

[0025] To further optimize the above technical solution, the screening and collection assembly includes a qualified hopper 5 and a waste hopper 6 located below the drum screen 2. The qualified hopper 5 is used to collect and transport fine slurry, and the waste hopper 6 is used to collect and transport large particles that have been screened out.

[0026] To further optimize the above technical solution, the gas supply device includes a factory high-pressure air pipeline network 43 and an air compressor 44; the factory high-pressure air pipeline network 43 and the air compressor 44 are connected in parallel with the gas transmission pipeline 42 through branch pipelines.

[0027] To further optimize the above technical solution, a network control valve 45 and an air compressor outlet valve 46 are respectively installed on the branch pipeline. The network control valve 45 and the factory high-pressure air network 43 are located on the same branch pipeline, and the air compressor outlet valve 46 and the air compressor 44 are located on the same branch pipeline.

[0028] To further optimize the above technical solution, a purge valve 7 is provided on the gas pipeline 42, and the purge valve 7 is electrically connected to the control unit.

[0029] To further optimize the above technical solution, high-pressure nozzles 41 are arranged at intervals along the axial direction of the drum screen 2, with a quantity of 5-8.

[0030] To further optimize the above technical solution, the distance between the high-pressure nozzle 41 and the outer wall of the drum screen 2 is 3-5cm.

[0031] Working Principle: This coal slurry rod mill drum screen cleaning device is based on the core principle of high-pressure gas purging replacing traditional water washing. Through the synergistic action of various components, it achieves efficient cleaning of the drum screen while avoiding the influence of external media on the coal slurry concentration. The discharge end of the rod mill 1 is connected to the drum screen 2. After the coal slurry enters the drum screen 2, the fine slurry is separated from large particles of impurities through screening. The screening and collection components collect the qualified fine slurry and the large particles on the screen, ensuring orderly separation of materials. The protective outer shell 3 covers the outside of the drum screen 2, forming a relatively enclosed space, which not only prevents impurities from splashing during the purging process but also provides a stable installation environment for the high-pressure nozzle 41.

[0032] A high-pressure nozzle 41 is positioned between the protective housing 3 and the drum screen 2, and is connected to an air supply device via an air pipeline 42, allowing high-pressure gas to be directionally sprayed onto the surface of the drum screen 2. The air source control valve is electrically connected to the control unit, which, by opening the purging valve, regulates the opening and closing of the air source control valve and the air supply device, achieving precise control over the timing and duration of the purging process. Through the impact force of the high-pressure gas, large particles of impurities adhering to the surface of the drum screen are blown off and enter the waste hopper along with the waste material on the screen, thus keeping the screen unobstructed. Dual air sources ensure a stable supply of purging air, preventing cleaning interruptions due to a single air source failure.

[0033] Workflow: Coal slurry enters the drum screen 2 from the discharge end of the rod mill 1. During the operation of the drum screen 2, fine slurry falls through the screen mesh and enters the qualified hopper 5 below, where it is collected and transported to subsequent processes. Large particles that cannot pass through the screen are transported to the end with the rotation of the drum screen 2 and fall into the waste hopper 6 for collection and treatment. The control unit starts the cleaning process according to the preset program or actual needs: First, it confirms the air supply status, opens the cleaning valve 7, and prioritizes the use of the factory high-pressure air pipeline 43. At this time, the pipeline control valve 45 is open, the air compressor 44 is in standby mode, and the air compressor outlet valve 46 is closed. If the factory high-pressure air pipeline 43 fails, the control unit automatically switches to the air compressor 44 and opens the air compressor outlet valve 46 to ensure a stable air supply. The air source is delivered to the high-pressure nozzle 41 through the air delivery pipeline 42, and the high-pressure gas is directionally sprayed onto the surface of the drum screen 2 through the nozzle. The high-pressure gas jet impacts and blows away residual large particles of impurities adhering to the screen surface, preventing screen blockage. The blown-off impurities enter the waste hopper 6 along with the waste material on the screen. After purging is completed, the control unit closes the purging valve 7 and the gas source control valve, and the purging mechanism stops working; the device returns to the coal slurry screening stage, awaiting the next purging command. Throughout the process, the protective shell 3 remains closed, ensuring that the purged impurities are effectively collected in the waste hopper, avoiding any impact on the surrounding environment.

[0034] Therefore, this utility model adopts the aforementioned coal slurry rod mill drum screen cleaning device, using high-pressure gas cleaning instead of traditional water washing, eliminating the entry of primary water into the coal slurry system, fundamentally avoiding fluctuations in coal slurry concentration caused by external moisture, effectively reducing system fluctuations such as unstable furnace conditions, and ensuring long-term stable operation of the production system. By setting multiple high-pressure nozzles between the protective shell and the drum screen, impurities adhering to the drum screen mesh can be precisely and efficiently blown away, ensuring that the drum screen mesh is always unobstructed, avoiding problems such as mill slurry leakage or screening failure caused by blockage, and improving screening efficiency. Using high-pressure air from the factory or high-pressure gas provided by an air compressor as the cleaning medium, it completely replaces traditional primary water washing, significantly reducing water consumption, reducing resource waste in the production process, and meeting the production requirements of energy conservation and consumption reduction. The protective outer casing, located outside the drum screen, provides a relatively enclosed space for high-pressure purging, reducing the impact of impurity splashing on the surrounding environment. The air supply system employs a dual-path design, with the factory's high-pressure air pipeline network and air compressor connected in parallel. Combined with control valves on the branch pipelines, it automatically switches to the backup air source in case of a main air source failure, ensuring uninterrupted purging operation and further improving the reliability of the equipment. Stable high-pressure gas purging reduces wear on the screen caused by clogging or water corrosion, extending the service life of the drum screen and related components, reducing equipment maintenance frequency and costs, and achieving long-term stable operation of the production equipment.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A cleaning device for a rotary drum screen of a coal slurry bar mill, characterized in that, include: A rod mill, which has a discharge end; A rotary screen is installed at the discharge end of the rod mill; A screening and collection assembly, located below the drum screen, is used to separate and collect qualified materials from waste materials on the screen. A protective outer shell is fitted over the outside of the drum screen and connected to the screening and collecting assembly; The cleaning mechanism includes a high-pressure nozzle, an air supply pipeline, an air source control valve, and an air source supply device. The high-pressure nozzle is disposed between the protective shell and the drum screen. The air supply pipeline passes through the top wall of the protective shell and connects the high-pressure nozzle and the air source supply device. The control unit is electrically connected to the gas source control valve and the gas source supply device to control their opening and closing.

2. The cleaning device for a coal slurry bar mill drum screen according to claim 1, characterized in that, The screening and collection assembly includes a qualified hopper and a waste hopper located below the drum screen. The qualified hopper is used to collect and convey fine slurry, and the waste hopper is used to collect and convey large particles that have been screened out.

3. The cleaning device for a coal slurry bar mill drum screen according to claim 1, characterized in that, The gas supply device includes a factory high-pressure air pipeline network and an air compressor; the factory high-pressure air pipeline network and the air compressor are connected in parallel to the gas transmission pipeline through branch pipelines.

4. The cleaning device for a coal slurry rod mill drum screen according to claim 3, characterized in that, The branch pipelines are respectively equipped with a pipeline control valve and an air compressor outlet valve. The pipeline control valve and the factory high-pressure air pipeline are located on the same branch pipeline, and the air compressor outlet valve and the air compressor are located on the same branch pipeline.

5. The cleaning device for a coal slurry bar mill drum screen according to claim 1, characterized in that, The gas pipeline is equipped with a purge valve, which is electrically connected to the control unit.

6. The cleaning device for a coal slurry bar mill drum screen according to claim 1, characterized in that, The high-pressure nozzles are spaced apart along the axial direction of the drum screen, with a quantity of 5-8.

7. The cleaning device for a coal slurry bar mill drum screen according to claim 1, characterized in that, The distance between the high-pressure nozzle and the outer wall of the drum screen is 3-5cm.

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