Intelligent Powder Removal System and Control Method

Abstract

The present invention provides an intelligent coal powder separation system and a control method, belonging to the field of coal equipment. It includes a coal powder separation unit, a washed coal line, a fine coal line, a product coal line and a monitoring component. An inlet box is provided at the upper end of the coal powder separation unit, and a fine coal outlet and a washed coal outlet are provided at the lower end of the coal powder separation unit. The fine coal outlet is correspondingly arranged at the feeding end of the fine coal line, and the washed coal outlet is correspondingly arranged at the feeding end of the washed coal line. The monitoring component receives the signals of the monitoring devices and controls the start and stop of the electric control elements. The discharging end of the washed coal line is correspondingly arranged with the coal preparation system. The present invention can realize online adjustment and control of the coal powder separation particle size and the coal powder separation amount, controllable ultra-fine particle coal powder separation, and is not prone to problems of sieve hole and sieve slot blockage. It is closely integrated with the product quality control system of the coal preparation plant, intelligently and precisely controls the coal powder separation amount and the product coal quality according to the product ash requirement, maximizes the product yield of the coal preparation plant, is intelligently linked with the control system of the coal preparation plant, and realizes full-automatic, unattended and intelligent operation of the coal powder separation system.

Description

Technical Field

[0001] The present invention belongs to the fields of coal technology and equipment, and relates to a dedusting unit and a dedusting system that can automatically control the dedusting particle size and dedusting amount of raw coal online according to the product quality control requirements and the raw coal quality conditions, optimize the washing ratio, and stably control the quality of the product coal, and particularly relates to an intelligent dedusting system and a control method. Background Art

[0002] In the production process of coal preparation plants (especially thermal coal preparation plants), a large amount of coal slime will be generated from the pulverized coal in raw coal. In addition, there are also problems such as difficult washing, high moisture content and low calorific value of the products after washing during the washing process of pulverized coal. The washing of pulverized coal has a great negative impact on the product quantity and quality, production cost, sales revenue, environmental protection, water saving and consumption reduction of thermal coal preparation plants. Reducing the amount of coal slime in the coal washing industry is the consensus and urgent need of the industry. From the current development trend of coal preparation technology, pre-washing dedusting is an important means of reducing coal slime. Appropriate particle size dedusting and washing according to the raw coal quality conditions and product quality requirements are the urgent needs of the current coal washing industry.

[0003] In addition, the intelligent control of the washing process is also the general trend of the national industrial plan.

[0004] At present, as a new process section of the coal preparation process, the dedusting process has begun to be gradually promoted and applied in some thermal coal preparation plants. However, due to the imperfect process and technology of the existing dedusting system and equipment, the application of the dedusting process still has great limitations:

[0005] 1. The lower limit of the dedusting classification particle size is high. Restricted by the current processing technology of dedusting equipment, the screen surface material and the dedusting theoretical model relied on, the achievable lower limit of the dedusting classification particle size is relatively high. According to different coal qualities, the achievable lower limit of the classification particle size of the current dedusting equipment is generally between 3 - 6 mm, which cannot meet the dedusting process requirements of finer particle sizes (according to different coal qualities and product quality requirements, the lower limit of the applied dedusting particle size in some cases needs to be as low as about 1.5 mm).

[0006] 2. It is impossible to realize the online adjustment of the dedusting particle size and the dedusting amount according to the principle of particle size priority. At present, the dedusting process adopted is the screening classification process, and the equipment used is a classification screen with a preset screen hole / screen slot size (a relaxation screen or an alternating screen roller screen). The dedusting particle size is completely controlled by the screen hole / screen slot, and it is relatively difficult to adjust the screen slot of this process equipment. When the coal quality fluctuates in a short time and it is necessary to flexibly adjust the dedusting particle size or the dedusting amount online, the existing dedusting process equipment cannot realize the online adjustment of the dedusting particle size or the dedusting amount according to the principle of particle size priority.

[0007] 3. The sieve holes / slits are prone to clogging. Currently, the particle size of the deslimed coal is completely controlled by small-sized sieve holes / slits. When the incoming material is relatively wet and sticky, the sieve holes often get clogged, resulting in a serious decline in desliming efficiency and even abnormal production.

[0008] 4. It cannot be effectively integrated with the on-line control system of the coal preparation plant product quality. For the desliming process before coal washing, the clean coal after washing and the unwashed fine coal are generally mixed as the product coal. Since the existing desliming equipment cannot achieve on-line adjustment of the desliming particle size or desliming amount, the control of the existing desliming device is often isolated from the product quality control system of the coal preparation plant, resulting in fluctuations in the quality of the product coal.

[0009] 5. The level of automation and intelligence is low. The existing desliming system has a low degree of automation and intelligence, which reduces the overall automation and intelligence level of the coal preparation plant and does not conform to the national industrial development orientation.

[0010] In summary, in view of the problems existing in the existing desliming process system, it is very necessary to research a desliming system and its supporting equipment and facilities that can overcome the problems existing in the existing desliming process equipment and achieve intelligent control. Summary of the Invention

[0011] The problem to be solved by the present invention is to provide an intelligent desliming system and control method, which can achieve on-line adjustable and controllable ultra-fine particle desliming, the lower limit of the desliming particle size can reach about 1.5 mm, and it is not easy to have problems of sieve hole / slit clogging, closely integrate with the product quality control system of the coal preparation plant, intelligently and accurately control the desliming amount and the quality of the product coal according to the product ash content, maximize the product yield of the coal preparation plant, and be intelligently linked with the control system of the coal preparation plant to realize full automation, unmanned operation and intelligence of the desliming system.

[0012] To solve the above technical problems, the technical solution adopted by the present invention is: the intelligent desliming system and control method include a desliming unit, a coal feed line for washing, a fine coal line, a product line and a monitoring component. An inlet box is provided at the upper end of the desliming unit, and a fine coal outlet and a coal feed outlet for washing are provided at the lower end. The fine coal outlet corresponds to the feeding end of the fine coal line, and the coal feed outlet for washing corresponds to the feeding end of the coal feed line for washing. The monitoring component receives the signals of the monitoring device and controls the start and stop of the electric control components;

[0013] The discharging end of the coal feed line for washing is correspondingly arranged with the coal washing system.

[0014] Further, the raw coal feeding line refers to the device for conveying raw coal to be washed and selected to the washing and selection system, including a No. 1 scraper conveyor and a raw coal feeding belt arranged in sequence on the production line. The No. 1 scraper conveyor is arranged at the lower end of the raw coal outlet of the washing line. The discharging end of the No. 1 scraper conveyor corresponds to the raw coal feeding belt. The discharging end of the raw coal feeding belt corresponds to the starting equipment of the coal washing and selection system. The output end of the washing and selection system is provided with a clean coal belt and a gangue belt.

[0015] Further, the pulverized coal line refers to the device for conveying the pulverized coal separated by the pulverized coal separation unit to the product line, including a No. 2 scraper conveyor and a pulverized coal belt arranged in sequence on the production line. The No. 2 scraper conveyor corresponds to the pulverized coal outlet. The discharging end of the No. 2 scraper conveyor corresponds to the pulverized coal belt. The discharging end of the pulverized coal belt corresponds to the product belt.

[0016] Further, the pulverized coal separated by the pulverized coal separation unit does not enter the washing and selection system. The clean coal produced by the washing and selection system and the pulverized coal both enter the product belt and are mixed as product coal.

[0017] Further, the monitoring component includes three belt scales. One belt scale is used to measure the weight of the raw coal for feeding. One belt scale is used to measure the weight of the pulverized coal. One belt scale is used to measure the weight of the product coal. The monitoring component also includes two on-line quality measurement instruments such as two calorimeters or two ash content meters. One calorimeter or ash content meter is used to measure the calorific value or ash content of the product coal on the product belt. One is used to measure the calorific value or ash content of the gangue in the washing and selection system. The monitoring component receives the detection data of the three belt scales and the two calorimeters or ash content meters, conducts transmission and comparative analysis, and issues action instructions to the relevant adjustment actuators.

[0018] Further, the pulverized coal separation unit includes a feeding box, a frame and a screening component. The upper end of the feeding box is open as the feeding port, and the lower end is communicated with the frame. The discharging end at the lower end of the frame corresponds to the upper end of the discharging box. A partition adjustment flap and a material flow switching flap are arranged inside the discharging box;

[0019] The screening component is mounted on the frame to conduct dry classification on the raw coal;

[0020] The frame is arranged obliquely downward from one end to the other end of the feeding box, and the screening component is arranged obliquely downward from one end to the other end of the feeding box; the screening component includes a rotating shaft and a rotating motor arranged in a matching manner. The rotating shaft is mounted on the frame, and the rotating motor drives the rotating shaft to rotate in the same direction. A plurality of sieve plates coaxial with the rotating shaft are arranged on the rotating shaft, and the sieve plates on adjacent rotating shafts are arranged staggeredly.

[0021] Further, the blanking bin is divided into several regions along the length direction of the deflouring unit by a dividing and adjusting flap. The dividing and adjusting flap is installed between two adjacent regions inside the blanking bin and is used to adjust the size of the divided regions. There are two discharge ports at the lower end of each divided region of the blanking bin. One outlet leads to the pulverized coal line and the other outlet leads to the washed coal inlet line. The material flow switching flap is used to enable the material to enter one of the directions. The dividing and adjusting flap and the material flow switching flap are driven to rotate by an electric, electro-hydraulic or pneumatic actuator, and the actuators of the dividing and adjusting flap and the material flow switching flap accept the remote online control of the monitoring component.

[0022] Further, a double-layer scraper is provided along the length direction at the lower edge of the blanking bin. The upper layer of the double-layer scraper is correspondingly arranged with the material under the screen chute. The double-layer scraper runs continuously up and down. The upper scraper runs in the opposite direction to the over-screen material, and the lower scraper runs in the same direction as the over-screen material. The discharge port of the upper layer of the double-layer scraper is correspondingly arranged with the pulverized coal collection device, and the discharge port of the lower layer of the double-layer scraper is correspondingly arranged with the washed coal collection device.

[0023] Further, below the two regions of the blanking bin far from the feeding bin, regulating gates are provided at the corresponding positions of the upper layer of the double-layer scraper. The regulating gates are driven by an electric power source, a pneumatic power source or a hydraulic power source. When the regulating gates are opened, the under-screen material in the corresponding section enters the lower layer of the double-layer scraper and then enters the washing system. The regulating gates are gradually opened from the side far from the feeding bin to the other side, or gradually closed from the side close to the feeding bin to the other side to achieve the purpose of lowering or raising the classification particle size.

[0024] Further, a secondary screening machine is provided at the discharge end of the deflouring unit. The secondary screening machine includes a second screening component, a second frame and a discharge box. There is one discharge port at the lower end of the discharge box. The second screening component is arranged on the second frame. The structure of the second screening component is the same as that of the screening component. The second screening component is inclined downward from the side close to the feeding bin to the other end and the slope is the same as that of the screening component. The upper end of the second screening component is lower than the lowest end of the screening component. A diversion plate is arranged between the second screening component and the screening component and is inclined downward.

[0025] The intelligent deflouring system control method includes the following steps

[0026] S1. Feeding and screening. The raw coal is screened by a desliming unit. First, parameters are input and compared. The coal preparation control system sends product quality control indicators, control interval set values, and preset separation densities to the intelligent desliming system and the control center. Different products have different parameter settings, which are adjusted according to the actual situation. The intelligent desliming system, based on the reference coal quality data pre-stored in the system, uses the pre-established desliming model curve to simulate and calculate the desliming ratio and desliming particle size, and then sends these signals to the desliming unit for execution;

[0027] S2. Online adjustment of desliming particle size and desliming amount. A partition adjustment flap and a material flow switching flap are arranged in the feeding box. The partition adjustment flap is installed between two adjacent areas inside the feeding box and is used to adjust the size of the partition area, thereby realizing the adjustment of desliming particle size and desliming amount. There are two discharge ports at the lower end of each partition area of the feeding box. One outlet leads to the pulverized coal line, and one outlet leads to the coal-in-washing line. The material flow switching flap is used to make the material enter one of the directions;

[0028] S3. Automatic selection and online switching of material flow direction. The coal-in-washing line and the pulverized coal line. The coal-in-washing line refers to the device for transporting the raw coal to be washed to the coal preparation system, including a No. 1 scraper conveyor and a coal-in-washing raw coal belt arranged in sequence on the production line. The No. 1 scraper conveyor is arranged at the lower end of the coal-in-washing outlet. The discharge end of the No. 1 scraper conveyor is correspondingly arranged with the coal-in-washing raw coal belt. The discharge end of the coal-in-washing raw coal belt is correspondingly arranged with the starting equipment of the coal preparation system. The output end of the coal preparation system is provided with a clean coal belt and a gangue belt;

[0029] The pulverized coal line refers to the device for transporting the pulverized coal separated by the desliming unit to the product line, including a No. 2 scraper conveyor and a pulverized coal belt arranged in sequence on the production line. The No. 2 scraper conveyor is correspondingly arranged with the pulverized coal outlet. The discharge end of the No. 2 scraper conveyor is correspondingly arranged with the pulverized coal belt. The discharge end of the pulverized coal belt is correspondingly arranged with the product belt;

[0030] S4. Online monitoring and debugging. The data collected by the belt scale and the ash analyzer are fed back to the control center of the intelligent desliming system. The intelligent desliming system automatically calculates the quantity of coal-in-washing raw coal and the quantity of pulverized coal based on the above feedback data. These data serve as the basis for adjusting the partition adjustment flap of the intelligent desliming system. The intelligent desliming system compares the product ash data fed back by the product ash analyzer in real time with the preset product ash range. If the actual feedback product ash is within the preset range, the partition adjustment flap of the desliming system will not act. If the actual feedback product ash is higher than the upper limit of the preset product ash interval, the partition adjustment flap will move towards one end of the feeding box to reduce the desliming particle size and increase the coal-in-washing ratio;

[0031] If the actual ash content of the feedback product coal is lower than the lower limit of the preset product coal ash content range, the splitting and adjusting flap moves towards the end away from the feed box, increasing the dedusting particle size and reducing the washing ratio. The intelligent dedusting system and control method monitor the data of the ash meter in real time through the monitoring component, adjust the cutting position of the undersize material, control the dedusting amount, and ensure that the product coal ash content is always within the set range.

[0032] Compared with the prior art, the present invention has the following advantages and positive effects.

[0033] 1. The present invention can achieve online adjustable and controllable ultra-fine particle dedusting. The lower limit of the dedusting particle size can reach about 1.5 mm, and it is not easy to have problems such as sieve holes / sieve slots clogging. It is closely integrated with the product quality control system of the coal preparation plant, intelligently and accurately controls the dedusting amount and the quality of the product coal according to the product ash content, maximizes the product yield of the coal preparation plant, and is intelligently linked with the control system of the coal preparation plant to realize full-automatic, unattended, and intelligent operation of the dedusting system.

[0034] 2. In this structure, the sieve slot of the fine particle sizing screen can be appropriately larger than the actual dedusting classification particle size. The final dedusting classification particle size is further adjusted and controlled by the method of segmentally cutting the undersize material. That is, the closer the splitting and adjusting flap is to the feed box, the finer the final dedusting classification particle size, so as to further reduce the lower limit of the dedusting classification particle size and avoid / mitigate the phenomenon of sieve slot clogging of the fine particle sizing screen. The larger the sieve slot size, the less likely it is to clog. In addition, the position of the splitting and adjusting flap can be accurately adjusted online according to the instruction of the control center through electric, pneumatic or electro-hydraulic driving components. The undersize material can also flexibly switch the position of the material flow switching flap according to the instruction of the control center to adjust the destination. In this way, the entire intelligent dedusting unit has a flexible online adjustment function.

[0035] 3. This structure breaks the limitation of the performance of existing dedusting equipment on the popularization of the dedusting process, enabling the environmentally friendly, energy-saving, and efficient coal washing process of dedusting and washing to be applied in the vast majority of steam coal preparation plants, thereby greatly saving water, electricity, and reagent consumption in steam coal preparation plants, reducing the environmental pressure caused by the landing of coal slime, and reducing the economic losses brought to coal production enterprises.

[0036] 4. This structure overcomes the problem that the dedusting particle size of existing dedusting equipment cannot be adjusted online, enabling the process adjustment of the dedusting process link to achieve automation and intelligence. This can not only greatly reduce the labor cost and waste of production materials caused by replacing the sieve plate or reinstalling the sieve surface during the particle size adjustment of existing equipment, reduce the impact of the dedusting particle size adjustment time on normal production, but more importantly, it can organically integrate the dedusting process link into the entire process automatic control and adjustment system of the coal washing plant, and can timely and accurately adjust the dedusting particle size and control the dedusting amount according to the feedback data of the raw coal and product quality, so as to achieve the purpose of accurately and stably controlling the product quality and increasing the product yield. Description of the Drawings

[0037] The accompanying drawings that form a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0038] Figure 1 is the screening principle diagram of the present invention;

[0039] Figure 2 is the front view of the powder removal unit of the present invention;

[0040] Figure 3 is the cross-sectional view of the powder removal unit of the present invention in the front view direction;

[0041] Figure 4 is the present invention Figure 3 detail drawing of part A;

[0042] Figure 5 is the present invention Figure 3 detail drawing of part B;

[0043] Figure 6 is the structural schematic diagram of the powder removal unit of the present invention in the top view;

[0044] Figure 7 is the structural schematic diagram of the powder removal unit of the present invention in the side view;

[0045] Figure 8 is the structural schematic of the powder removal unit of the present invention without the frame and protective cover in the top view;

[0046] Figure 9 is the structural schematic of the powder removal unit of the present invention without the frame and protective cover in the side view;

[0047] Figure 10 is the structural schematic diagram of Embodiment 2 of the present invention;

[0048] Figure 11 is the process schematic diagram of the intelligent powder removal system of the present invention;

[0049] Figure 12 is the structural schematic diagram of the intelligent powder removal system of the present invention in the top view;

[0050] Figure 13 is the structural schematic diagram of the intelligent powder removal system of the present invention in the rear view;

[0051] Figure 14 is the cross-sectional view of the No. 1 scraper conveyor of the present invention in the front view;

[0052] Figure 15 is the present invention Figure 14 detail drawing of part C;

[0053] Figure 16It is the present invention Figure 14 Detailed drawing of part D of

[0054] Reference numerals:

[0055] 10, coal dust removal unit; 11, feed box; 12, frame; 13, screening assembly; 131, rotating shaft; 132, sieve plate; 133, rotating motor; 14, blanking box; 141, first driving member; 142, second driving member; 143, dividing and adjusting flap; 144, material flow switching flap; 145, washed coal inlet; 146, pulverized coal outlet; 15, secondary screening machine; 151, second frame; 152, second screening assembly; 153, discharge box; 154, discharge plate; 16, guide plate; 17, double-layer scraper; 18, regulating gate; 19, chute; 20, washed coal line; 21, No. 1 scraper conveyor; 22, raw coal belt for washing; 23, washing system; 24, washed clean coal belt; 25, gangue belt; 30, pulverized coal line; 31, No. 2 scraper conveyor; 32, pulverized coal belt; 33, product belt; 40, monitoring assembly; 41, belt scale; 42, ash analyzer. Detailed implementation manners

[0056] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0059] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0060] Figure 1 It is the screening mechanism of materials during the screening process, which has been proven correct through a large number of experiments and observation results. Particles with a size less than half of the sieve hole size (termed "half grains" in professional terms) are easily screened particles and will quickly pass through the sieve near the feed end of the screening machine. Moreover, the smaller the particle size is compared to the sieve hole / slot size, the easier it is for the particle to pass through the sieve. Therefore, along the length direction of the screening machine, from the feed end to the discharge end, the particle size composition of the undersize material follows the following rule: Materials smaller than half grains are concentrated near the feed end of the screening machine. Then, the closer to the discharge end, the higher the content of materials with a larger particle diameter and the lower the content of materials with a smaller particle diameter in the particle size composition of the undersize material.

[0061] As Figures 12 - 14 shown, the present invention is an intelligent coal powder removal system and control method, including a coal powder removal unit 10, a coal washing line 20, a pulverized coal line 30, and a monitoring component 40. An inlet box 11 is provided at the upper end of the coal powder removal unit 10, and a pulverized coal outlet 146 and a coal washing inlet outlet 145 are provided at the lower end of the coal powder removal unit 10. The pulverized coal outlet 146 is arranged corresponding to the feeding end of the pulverized coal line 30, and the coal washing inlet outlet 145 is arranged corresponding to the feeding end of the coal washing line 20. The monitoring component 40 receives signals from the electric control components and controls the start and stop of the electric control components. The discharging end of the coal washing line 20 is correspondingly arranged with the coal washing system 23. More preferably, a chute 19 is provided at the lower end of the pulverized coal outlet 146, and an independent chute 19 is provided at the outlet of the coal washing inlet. The upper end of each chute 19 corresponds to a unique inlet, and the lower end corresponds to a unique outlet, realizing the transfer of materials from the coal powder removal unit 10 to the coal washing line 20 or the pulverized coal line 30.

[0062] Preferably, the coal washing line 20 includes a No. 1 scraper conveyor 21, a raw coal belt for coal washing 22, and a coal washing system 23 arranged in sequence in a production line. The No. 1 scraper conveyor 21 is arranged at the lower end of the coal washing inlet outlet 145. The discharging end of the No. 1 scraper conveyor 21 is correspondingly arranged with the raw coal belt for coal washing 22. The discharging end of the raw coal belt for coal washing 22 is correspondingly arranged with the coal washing system 23. A washed coal belt 24 and a gangue belt 25 are provided at the output end of the coal washing system 23.

[0063] Preferably, the pulverized coal line 30 includes a No. 2 scraper conveyor 31 and a pulverized coal belt 32 arranged in sequence in a production line. The No. 2 scraper conveyor 31 is arranged corresponding to the pulverized coal outlet 146. The discharging end of the No. 2 scraper conveyor 31 is correspondingly arranged with the pulverized coal belt 32. The outlets of the pulverized coal belt 32 and the washed coal belt 24 both enter the product belt 33 and are mixed to be used as product coal.

[0064] As Figures 14 - 16As shown, the structures of scraper No. 1 21 and scraper No. 2 31 are the same. The upper end of scraper No. 1 21 is opened to receive the falling materials. A discharge port 212 is provided at the lower part of the lower discharge end. Scraper No. 1 21 is a box structure with a conveyor belt structure inside. A plurality of toggle plates 211 are evenly distributed on the upper end of the conveyor belt to facilitate the material box discharge port 212 to be transported during the transportation process.

[0065] Preferably, the monitoring component 40 includes three belt scales 41, one belt scale 41 is used to measure the weight of the raw coal fed into the feed, one belt scale 41 is used to measure the weight of the pulverized coal, and one belt scale 41 is used to measure the weight of the product coal. The monitoring component 40 also includes two ash meters 42, one ash meter 42 is set corresponding to the product coal on the product belt 33, and the other is set corresponding to the gangue belt 25 of the coal washing line 20. The monitoring component 40 receives the detection data of the three belt scales 41 and the two ash meters 42 and transmits them, collects the quantitative and qualitative information of the raw coal, pulverized coal and product coal, which is conducive to real-time monitoring and adjustment, and forms a closed-loop control and self-feedback system. In the present application, the belt scale 41 can also be replaced by other electronic weighing instruments, which is not limited in the present application.

[0066] The ash meter 42 is used for real-time monitoring of the ash content. Ash content is an important parameter for measuring product quality. The monitoring component 40 receives the data monitored in real time by the ash meter 42, and then compares the collected data with the preset data. Comparison and algorithms are commonly used methods in this field, which will not be described here. The action of the de-powdering unit 10 is adjusted by the control center, as described in detail as follows. This realizes closed-loop control and is suitable for rapid analysis and online adjustment of coal quality. In the present application, the ash meter 42 can also be replaced by a calorimeter. Any detector that can detect product quality can realize the functions of the present application. The calorimeter can measure calorific value, and both ash content and calorific value can be used to measure product quality.

[0067] The monitoring component 40 and the control center in this structure can complete the analysis and collation of the quality information of the raw coal and the product quantity, the PID control of the powder removal amount and the final quality (ash content), etc., communicate with the production system of the coal preparation plant, and can be incorporated into the overall centralized control system of the coal preparation plant as a subsystem.

[0068] like Figures 2 - 10 As shown, the powder removal unit 10 includes a feed box 11, a frame 2, a screening assembly 13 and a discharge box 14. The upper end opening of the feed box 11 is set as a feed port, and the lower end is connected to the frame 2. The upper end of the frame 2 is closed, and the discharge at the lower end is set corresponding to the upper end of the discharge box 14. The lower end of the discharge box 14 is provided with a grading assembly;

[0069] The screening assembly 13 is installed on the frame 12 to screen the raw coal. The coal with a particle size meeting the requirements can fall into the lower blanking bin 14. On the basis of automatic screening, with the intervention of the screening assembly 13, it is beneficial to the deep classification and screening of the raw coal, improving the efficiency of deep classification screening.

[0070] The frame 2 is arranged obliquely downward from one end to the other end of the feeding box 11, and the screening assembly 13 is arranged obliquely downward from one end to the other end of the feeding box 11. The frame 2 and the screening assembly 13 are matched and arranged obliquely downward, ensuring that the raw coal is continuously conveyed downward under the action of gravity, saving power transmission and making the structure simpler and more compact.

[0071] Preferably, a diversion plate 111 arranged obliquely downward is provided inside the feeding box 11, which has a buffering and guiding effect during the process of the raw coal falling from the upper end, reducing noise and also preventing the raw coal from directly falling onto the screening assembly 13, causing impact or dust, and avoiding the flying and leakage of particles, being more environmentally friendly. A maintenance door 121 with a portal structure is provided at the upper end of the frame 2. In case of unsmooth screening, it can be opened in time for inspection, which is beneficial to timely maintenance and repair, improving the convenience of maintenance. The number of maintenance doors 121 is multiple and they are evenly distributed. A convenient operation handle is provided at the upper end of the maintenance door 121, improving the convenience of operation. Multiple lifting holes are provided at the upper end of the frame 2, facilitating lifting during assembly and improving the convenience of operation.

[0072] Preferably, the screening assembly 13 includes a matching rotating shaft 131 and a rotating motor 133. The rotating shaft 131 is installed on the frame 2. Both ends of the rotating shaft 131 rotate relative to the frame 2 through a bearing and bearing seat structure. The rotating motor 133 is installed on the frame 2 through a motor seat, and the rotating motor 133 drives the rotating shaft 131 to rotate. A plurality of coaxial sieve plates 132 are provided on the rotating shaft 131. The plurality of sieve plates 132 are arranged in parallel, and the sieve plates 132 on adjacent rotating shafts 131 are arranged staggeredly. During the rotation of the rotating shaft 131, the sieve plates 132 are driven to rotate. The incoming coal enters between the sieve plates 132 or between the sieve plates 132 and the rotating shaft 131, and the pulverized coal falls through the gaps between the sieve plates.

[0073] Preferably, two dividing and adjusting flap plates 143 are hinged to the upper part of the blanking box 14. The dividing and adjusting flap plates 143 are rotated by a first driving member 141. The blanking box 14 is sequentially divided into three regions by the two dividing and adjusting flap plates from one side to the other side of the feeding box 11. Two discharge ports are provided at the lower end of each region, one is the pulverized coal outlet 146 and the other is the washed coal inlet 145. Only one of the pulverized coal outlet 146 and the washed coal inlet 145 is in an open state through the position change of the material flow switching flap 144. The dividing and adjusting flap rotates under the action of the first driving member 141. The dividing and adjusting flap is fixed to the output shaft of the first driving member 141. According to the discharging situation, that is, the particle size situation of each region, the rotation angle of the dividing and adjusting flap is adjusted. If the particles in the region close to the feeding box 11 are larger, then the first driving member 141 drives the dividing and adjusting flap to rotate towards the side close to the feeding box 11 to ensure that the particle size in the region closest to the feeding box 11 is the smallest and meets the set requirements. On the contrary, if the particle size in the region close to the feeding box 11 is small enough and the particles in the adjacent second region are also very small, then the dividing and adjusting flap rotates towards the side away from the feeding box 11 under the action of the first driving member 141 to expand the corresponding region. The first driving member 141 can be adjusted at any time through the control center. Because online real-time adjustment is achieved and the automation degree is high, manpower is saved. The control center can adopt a PLC control center, which is a common control form in the market, with simple programming and easy to learn, reducing the training cost of operators. In addition to using a PLC control program, a single-chip microcomputer structure can also be adopted. According to the process parameters input from the outside, the operating states of all electrical components are monitored through the PLC / single-chip microcomputer and related control components in the cabinet, and the segmented cutting positions of the undersize materials and the destinations of the undersize materials in each section are controlled, etc.

[0074] Preferably, the material flow switching flap 144 is hinged inside the blanking box 14. The material flow switching flap 144 is driven to rotate by a second drive provided on the blanking box 14. The two extreme positions of the material flow switching flap 144, one corresponds to the pulverized coal outlet 146 and the other corresponds to the washed coal inlet 145, and only one of them can be opened. Then, for different regions of the blanking box 14, the opened positions are different. In the region close to the feeding box 11, the particle size of the undersize material is fine, and the material flow switching flap 144 covers the washed coal inlet 145. The screened pulverized coal is directly discharged through the pulverized coal outlet 146 and directly enters the next process. Both the first driving member 141 and the second driving member 142 can adopt a motor, a rotary cylinder or a pneumatic limit automatic plug gate structure, which is not limited in this application. Many equivalent structures can be realized, such as a rotary cylinder, a rotary oil cylinder, a motor lead screw and other structures.

[0075] Preferably, a secondary screening machine 15 is provided at one end of the rack 2 away from the feeding box 11. The secondary screening machine 15 includes a second screening assembly 152, a second rack 151, and a discharge box 153. The second rack 151 is provided at the upper end of the discharge box 153 and the two are communicated. A discharge port is provided at the lower end of the discharge box 153. The second screening assembly 152 is provided on the second rack 151. The structure of the second screening assembly 152 is the same as that of the screening assembly 13. An inclined downward discharge plate 154 is provided at one end of the second rack 151 away from the rack 2 to improve the efficiency of washing coal. More preferably, the second screening assembly 152 is inclined downward from the side close to the feeding box 11 to the other end and the slope is the same as that of the screening assembly 13. The upper end of the second screening assembly 152 is lower than the lowest end of the screening assembly 13. A diversion plate 16 inclined downward is provided between the second screening assembly 152 and the screening assembly 13, so as to ensure the stability of the transmission while the raw coal is conveyed in a stepped manner, and the drop-type setting has a certain vibration effect, playing a role in separating and discharging the materials in the front and rear sections.

[0076] In this structure, the screening assembly 13 adopts a screen roller screen structure, and a relaxation screen suitable for fine particle classification can also be selected according to the actual situation. The results of screening can be achieved in either case. The lengths and widths of the rack 2 and the feeding box 14 are matched, and the number of regional segments of the feeding box 14 can also be adjusted according to the actual situation and can be set to multiple, and set and adjusted according to actual requirements.

[0077] During the actual working process, this structure is locked with other production system equipment in the coal preparation plant and starts automatically in the reverse coal flow order. First, parameters are input and compared. The washing control system sends product quality control indicators, control interval set values, and preset separation densities to the intelligent de-dusting system and control method. Different products are set with different parameters and adjusted according to the actual situation. The intelligent de-dusting system uses the reference coal quality data stored in the system in advance and the pre-established de-dusting model curve to simulate and calculate the de-dusting ratio and de-dusting particle size, and then sends these signals to the de-dusting unit to execute. The de-dusting unit acts in place according to the signals sent by the control center of the intelligent de-dusting system, which is the initial working state of the de-dusting system. This step is completed during the automatic start-up process. The washing control system is a system that has been used in this field, and existing structures on the market can be used in combination with this application.

[0078] Monitor the operation of the component 40, and the data collected by the belt scale and the ash meter are fed back to the control center of the intelligent de-dusting system. The intelligent de-dusting system automatically calculates the quantity of raw coal washed and the de-dusting quantity according to the above feedback data, and these data can be used as the basis for adjusting the dividing and adjusting flap of the intelligent de-dusting system.

[0079] The intelligent powder separation system compares the product coal ash data fed back by the product coal ash meter with the preset product coal ash range in real time. If the actual fed-back product coal ash is within the preset range, the splitting adjustment flap of the powder separation system will not act. If the actual fed-back product coal ash is higher than the upper limit of the preset product coal ash range, the splitting adjustment flap will move towards one end of the feed box to reduce the powder separation particle size and increase the washing ratio. If the actual fed-back product coal ash is lower than the lower limit of the preset product coal ash range, the splitting adjustment flap will move towards the end away from the feed box to increase the powder separation particle size and reduce the washing ratio. The intelligent powder separation system and control method monitor the data of the ash meter in real time through the monitoring component, adjust the cutting position of the under-screen material, control the powder separation amount, and ensure that the product coal ash is always within the set range.

[0080] When the coal preparation plant stops, the equipment of the intelligent powder separation process system is locked with other production system equipment of the coal preparation plant and stops automatically in the order of the coal flow.

[0081] The working process of the powder separation unit is as follows. The raw coal is fed to the feed box 11 through the belt for feeding. Under the action of gravity, the raw coal is conveyed from one end of the feed box 11 to the other end. At this time, according to Figure 1 the principle shown, the pulverized coal with a particle size less than 1.5 mm that meets the requirements falls into the area of the discharge box 14 closest to the feed box 11. Then, the material flow switching flap 144 covers the washed coal outlet 145, and the pulverized coal that meets the particle size requirements is output from the pulverized coal outlet 146. The raw coal that does not meet the particle size requirements continues to be conveyed downward on the screening component 13. During the conveying process, the position of the material flow switching flap 144 is adjusted according to the particle size to achieve the output of the pulverized coal. As the raw coal is continuously conveyed and screened, the raw coal is continuously deeply classified and output, and finally enters the secondary screening machine 15 to improve the efficiency of the washed coal. In the whole structure, the positions of the material flow switching flap 144 and the splitting adjustment flap can be adjusted through the control center, realizing online intelligent adjustment and classification, with high automation degree, reducing the labor intensity and improving the work efficiency.

[0082] Embodiment 2: As Figure 11 shown, different from the above embodiment, the discharge box 14 is divided into three regions in sequence from one side to the other side of the feed box 11. A double-layer scraper 17 is arranged along the length direction of the lower edge of the discharge box 14. The upper layer of the double-layer scraper 17 is correspondingly arranged with the under-screen chute material. The double-layer scraper 17 runs continuously up and down. The upper scraper runs in the opposite direction to the over-screen material, and the lower scraper runs in the same direction as the over-screen material. The discharge port of the upper layer of the double-layer scraper 17 is correspondingly arranged with the pulverized coal collection device, and the discharge port of the lower layer of the double-layer scraper 17 is correspondingly arranged with the washed coal collection device.

[0083] Preferably, below the two regions of the blanking box 14 far from the feeding box 11, adjusting gates 18 are provided at the corresponding positions on the upper layer of the double-layer scraper 17. The adjusting gates 18 are driven by an electric power source, a pneumatic power source or a hydraulic power source. When the adjusting gates 18 are opened, the undersize materials in the corresponding sections enter the lower layer of the double-layer scraper 17 and then enter the washing system. The adjusting gates 18 are gradually opened from the side far from the feeding box 11 to the other side and are set according to the decreasing order of the controlled pulverized coal particle size. The opening degree of each adjusting gate 18 can also be arbitrarily controlled according to requirements to achieve online automatic adjustment, which is convenient, reliable and intelligent.

[0084] The specific working process of Embodiment 2 is different from the above embodiment in the screening of particle size. Instead of adjusting the turning plate by segmentation, it is controlled by the adjusting gates 18 on the double-layer scraper 17. The adjusting gates 18 are equivalent to the function of the segmented adjusting turning plate, and the double-layer scraper 17 is equivalent to the powder outlet and the washed coal outlet 145. The blanking screening of the two embodiments is different, but both can achieve the function of deep classification and can also achieve online adjustment.

[0085] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. An intelligent powder removal system, characterized in that: It includes a coal powder removal unit, a raw coal washing line, a pulverized coal line, a product line and a monitoring component. An inlet box is provided at the upper end of the coal powder removal unit, and a pulverized coal outlet and a raw coal washing outlet are provided at the lower end. The pulverized coal outlet is correspondingly arranged at the feeding end of the pulverized coal line, and the raw coal washing outlet is correspondingly arranged at the feeding end of the raw coal washing line. The monitoring component receives the signals from the monitoring devices and controls the start and stop of the electric control components; The discharging end of the raw coal washing line is correspondingly arranged with the coal washing system; The raw coal washing line refers to the device for transporting the raw coal to be washed to the coal washing system, including a No. 1 scraper conveyor and a raw coal washing belt arranged in sequence on the production line. The No. 1 scraper conveyor is arranged at the lower end of the raw coal washing outlet. The discharging end of the No. 1 scraper conveyor is correspondingly arranged with the raw coal washing belt. The discharging end of the raw coal washing belt is correspondingly arranged with the starting equipment of the coal washing system. The output end of the coal washing system is provided with a clean coal belt and a gangue belt; The coal powder removal unit includes an inlet box, a frame and a screening component. The upper end of the inlet box is open as the inlet, and the lower end is communicated with the frame. The discharging end at the lower end of the frame is correspondingly arranged with the upper end of the blanking box. A partition adjusting flap and a material flow switching flap are arranged inside the blanking box; The screening component is installed on the frame to perform dry classification on the raw coal; The frame is arranged obliquely downward from one end to the other end of the inlet box, and the screening component is arranged obliquely downward from one end to the other end of the inlet box; The screening component includes a rotating shaft and a rotating motor arranged in a matching manner. The rotating shaft is installed on the frame, and the rotating motor drives the rotating shaft to rotate in the same direction. A plurality of sieve plates coaxial with the rotating shaft are arranged on the rotating shaft, and the sieve plates on adjacent rotating shafts are arranged staggeredly; The blanking box is divided into several areas by the partition adjusting flap along the length direction of the coal powder removal unit. The partition adjusting flap is installed between adjacent two areas inside the blanking box for adjusting the size of the divided area; There are two discharging ports at the lower end of each divided area of the blanking box, one port leads to the pulverized coal line, and one port leads to the raw coal washing line. The material flow switching flap is used to realize the material entering one of the directions; The partition adjusting flap and the material flow switching flap are driven to rotate by an electric, electro-hydraulic or pneumatic actuator, and the actuators of the partition adjusting flap and the material flow switching flap accept the remote online control of the monitoring component.

2. The intelligent powder removal system according to claim 1, wherein: The pulverized coal line refers to the device for transporting the pulverized coal discharged from the coal powder removal unit to the product line, including a No. 2 scraper conveyor and a pulverized coal belt arranged in sequence on the production line. The No. 2 scraper conveyor is correspondingly arranged with the pulverized coal outlet. The discharging end of the No. 2 scraper conveyor is correspondingly arranged with the pulverized coal belt. The discharging end of the pulverized coal belt is correspondingly arranged with the product belt.

3. The intelligent powder removal system according to claim 1, characterized in that: The monitoring component includes three belt scales. One belt scale is used to measure the weight of the raw coal fed in, one belt scale is used to measure the weight of pulverized coal, and one belt scale is used to measure the weight of the product coal. The monitoring component also includes two online quality measurement instruments such as two calorimeters or two ash analyzers. One calorimeter or ash analyzer is used to measure the calorific value or ash content of the product coal on the product belt, and one is used to measure the calorific value or ash content of the gangue in the washing system. The monitoring component receives the detection data of the three belt scales and the two calorimeters or ash analyzers, transmits, compares and analyzes them, and issues action instructions to the relevant adjustment actuators.

4. The intelligent powder removal system according to claim 1, wherein: A double-layer scraper is provided along the length direction of the lower edge of the blanking box. The upper layer of the double-layer scraper is correspondingly arranged with the material in the under-screen chute. The double-layer scraper runs continuously up and down. The upper-layer scraper runs in the opposite direction to the over-screen material, and the lower-layer scraper runs in the same direction as the over-screen material. The discharge port of the upper layer of the double-layer scraper is correspondingly arranged with the pulverized coal collection device, and the discharge port of the lower layer of the double-layer scraper is correspondingly arranged with the washed coal collection device.

5. The intelligent powder removal system according to claim 4, wherein: Below the two areas of the blanking box far from the feeding box, adjustment gates are provided at the corresponding positions of the upper layer of the double-layer scraper. The adjustment gates are driven by an electric power source, a pneumatic power source or a hydraulic power source. When the adjustment gates are opened, the under-screen material in the corresponding section enters the lower layer of the double-layer scraper and then enters the washing system. The adjustment gates are gradually opened from the side far from the feeding box to the other side, or gradually closed from the side close to the feeding box to the other side to achieve the purpose of lowering or raising the classification particle size.

6. The intelligent powder removal system according to any one of claims 1-5, characterized in that: A secondary screening machine is provided at the discharge end of the deflaking unit. The secondary screening machine includes a second screening component, a second frame and a discharge box. There is a discharge port at the lower end of the discharge box. The second screening component is arranged on the second frame. The structure of the second screening component is the same as that of the screening component. The second screening component is inclined downward from the side close to the feeding box to the other end, and the slope is the same as that of the screening component. The upper end of the second screening component is lower than the lowest end of the screening component. A deflector plate inclined downward is provided between the second screening component and the screening component.

7. Control method for intelligent powder removal system, characterized in that: Including the following steps, S1. Feed and screen. The raw coal is screened by the deflaking unit. First, parameters are input and compared. The washing control system sends product quality control indicators, control interval set values and preset separation densities to the intelligent deflaking system and the control center. Different products are set with different parameters and adjusted according to the actual situation. The intelligent deflaking system uses the reference coal quality data stored in the system in advance and the deflaking model curve established in advance to simulate and calculate the deflaking ratio and deflaking particle size, and then sends these signals to the deflaking unit to execute; S2. Online adjustment of the powder separation particle size and powder separation amount. A partition adjustment flap and a material flow switching flap are arranged in the blanking box. The partition adjustment flap is installed between two adjacent areas inside the blanking box and is used to adjust the size of the partition area, thereby realizing the adjustment of the powder separation particle size and powder separation amount. There are two discharge ports at the lower end of each partition area of the blanking box. One outlet leads to the pulverized coal line, and one outlet leads to the raw coal line for washing. The material flow switching flap is used to make the material enter one of the directions; S3. Automatic selection and online switching of the material flow direction. There are a raw coal line for washing and a pulverized coal line. The raw coal line for washing refers to the device for transporting the raw coal to be washed and selected to the washing system, including a No. 1 scraper conveyor and a raw coal belt for washing arranged in sequence on the production line. The No. 1 scraper conveyor is arranged at the lower end of the outlet of the raw coal for washing. The discharge end of the No. 1 scraper conveyor is correspondingly arranged with the raw coal belt for washing. The discharge end of the raw coal belt for washing is correspondingly arranged with the starting equipment of the coal washing system. The output end of the washing system is provided with a clean coal belt and a gangue belt; The pulverized coal line refers to the device for transporting the pulverized coal separated by the pulverized coal separation unit to the product line, including a No. 2 scraper conveyor and a pulverized coal belt arranged in sequence on the production line. The No. 2 scraper conveyor is correspondingly arranged with the pulverized coal outlet. The discharge end of the No. 2 scraper conveyor is correspondingly arranged with the pulverized coal belt. The discharge end of the pulverized coal belt is correspondingly arranged with the product belt; S4. Online monitoring and debugging. The data collected by the belt scale and the ash analyzer are fed back to the control center of the intelligent powder separation system. The intelligent powder separation system automatically calculates the quantity of raw coal for washing and the quantity of pulverized coal based on the above feedback data. These data serve as the basis for adjusting the partition adjustment flap of the intelligent powder separation system. The intelligent powder separation system compares the product ash data fed back by the product ash analyzer with the preset product ash range in real time. If the actual feedback product ash is within the preset range, the partition adjustment flap of the powder separation system will not move. If the actual feedback product ash is higher than the upper limit of the preset product ash range, the partition adjustment flap moves towards one end of the feeding box, reducing the powder separation particle size and increasing the proportion of coal for washing; If the actual feedback product ash is lower than the lower limit of the preset product ash range, the partition adjustment flap moves towards the end away from the feeding box, increasing the powder separation particle size and reducing the proportion of coal for washing. The intelligent powder separation system and the control method monitor the data of the ash analyzer in real time through the monitoring component, adjust the cutting position of the undersize material, and control the powder separation amount to ensure that the product ash is always within the set range.

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