Deslagging device of coal mill and coal milling equipment

Abstract

The utility model discloses a coal mill deslagging device and coal milling equipment, and relates to the technical field of coal milling equipment, the coal mill deslagging device provided by the utility model comprises a coal mill deslagging box, an air extraction pipeline, an air extractor, a collecting device, an electric valve and a controller, the air exhaust pipeline is sequentially communicated with the coal mill deslagging box, the electric valve, the air exhauster and the collecting device, the electric valve is in communication connection with the controller, and the air exhauster is in communication connection with the controller. Before the slag discharging box of the coal mill is opened, the electric valve and the air extractor are opened in a linkage mode through the controller, high-pressure air in the slag discharging box is extracted, and dust carried out by the high-pressure air is collected in the collecting device, so that positive pressure in the slag discharging box of the coal mill can be eliminated, and dust overflow is prevented; the problem that dust pollution is reduced when the slag discharging box of the coal mill is opened is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal grinding equipment, in particular to a coal grinding machine slag discharge device and coal grinding equipment. Background Art

[0002] To ensure efficient coal combustion during thermal power generation, the coal must be finely ground. During this process, non-combustible impurities within the coal, such as stones and sand, are ground along with the coal, but these non-combustible materials are unsuitable for entry into the combustion system. These impurities are separated during the screening process and accumulate in the pulverizer's slag box. The pulverizer's slag box must be opened regularly, or when the box is full, to remove this waste residue.

[0003] Because waste slag remains hot upon entering the slag box, the ambient temperature and pressure inside the box are higher than those of the outside atmosphere. When the sealed slag box is opened, the hot air inside is rapidly released, forming a powerful jet. This jet carries a large amount of dust. Once it spreads into the workshop environment, it will cause serious pollution to the production site and pose a serious threat to the health of on-site workers. Therefore, appropriate safety measures and protective measures must be implemented to minimize the impact of slag discharge operations on the environment and workers. Utility Model Content

[0004] The main purpose of the utility model is to provide a coal mill slag discharge device and coal grinding equipment, aiming to reduce the dust pollution problem when the coal mill slag box is opened.

[0005] To achieve the above-mentioned purpose, the coal mill slag discharge device proposed in the utility model includes a coal mill slag discharge box, an exhaust pipe, an exhaust fan, a collecting device, an electric valve and a controller. The exhaust pipe is connected to the coal mill slag discharge box, the electric valve, the exhaust fan and the collecting device in sequence. The electric valve is communicatively connected to the controller, and the exhaust fan is communicatively connected to the controller.

[0006] In one embodiment, an air exhaust port is provided on the outer wall of the coal mill slag box, a first annular groove is provided on the periphery of the air exhaust port, a first sealing ring is provided in the first annular groove, and one end of the air exhaust pipe close to the coal mill slag box is detachably fixedly connected to the periphery of the air exhaust port and abuts against the first sealing ring.

[0007] In one embodiment, the coal mill slag discharge device further includes a filter element, which includes a support frame and a filter screen. The filter screen is arranged on the inner wall of the support frame, and the outer wall of the support frame is detachably connected to the inner wall of the air exhaust port.

[0008] In one embodiment, the coal mill slag discharge device further includes a check valve, which is provided in the air extraction pipe and located between the air extractor and the collecting device.

[0009] In one embodiment, the collecting device is detachably connected to an end of the exhaust pipe away from the coal mill slag box.

[0010] In one embodiment, the collecting device is a dust collecting bag.

[0011] In one embodiment, the collection device is a dust collecting can, the outer wall of the dust collecting can is provided with a dust collecting inlet, the periphery of the dust collecting inlet is provided with a second annular groove, a second sealing ring is provided in the second annular groove, and one end of the exhaust pipe close to the dust collecting can is detachably fixedly connected to the periphery of the dust collecting inlet and abuts against the second sealing ring; a roller is provided at the bottom of the dust collecting can.

[0012] In one embodiment, an observation window is provided on the outer wall of the coal mill slag box, a cleaning brush is provided on the inner side of the observation window, and the cleaning brush is rotatably connected to the inner wall of the coal mill slag box.

[0013] In one embodiment, the exhaust duct is provided with an inspection port, and a door is provided outside the inspection port. The door is rotatably connected to the periphery of the inspection port, and the door can be rotatably used to cover or reveal the inspection port.

[0014] The present invention also provides a coal grinding device, which includes the coal grinding device described in any one of the above embodiments.

[0015] The coal mill slag discharge device proposed by the utility model includes a coal mill slag box, an exhaust pipe, an exhaust fan, a collecting device, an electric valve and a controller. The exhaust pipe is connected to the coal mill slag box, the electric valve, the exhaust fan and the collecting device in sequence. The electric valve is communicatively connected to the controller, and the exhaust fan is communicatively connected to the controller. Before opening the coal mill slag box, the electric valve and the exhaust fan are first opened through the linkage of the controller to extract the high-pressure gas in the slag box and collect the dust brought out by the high-pressure gas in the collecting device. In this way, the positive pressure in the coal mill slag box can be eliminated, and dust can be prevented from overflowing, thereby reducing the problem of dust pollution when the coal mill slag box is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 This is a structural diagram of an embodiment of a coal mill slag discharge device provided by the utility model;

[0018] Figure 2 The present invention provides a coal mill slag discharge device according to an embodiment of the present invention;

[0019] Figure 3 for Figure 2 Schematic diagram of the structure at point A in the middle.

[0020] Description of Figure Numbers:

[0021] 100. Coal mill slag discharge device; 1. Coal mill; 2. Coal mill slag discharge box; 2a. Slag removal port; 2b. Air extraction port; 2c. First ring groove; 21. First sealing ring; 22. Filter element; 221. Support frame; 222. Filter screen; 23. Observation window; 24. Cleaning brush; 3. Air extraction pipe; 3a. Inspection port; 31. Bin door; 4. Air extractor; 5. Collecting device; 51. Roller; 6. Electric valve; 7. Controller; 8. Check valve.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The utility model provides a coal mill slag discharge device 100.

[0027] See also Figures 1 to 2 In one embodiment of the present invention, the coal mill slag discharge device 100 includes a coal mill slag discharge box 2, an air extraction pipe 3, an air extractor 4, a collecting device 5, an electric valve 6 and a controller 7. The air extraction pipe 3 is connected to the coal mill slag discharge box 2, the electric valve 6, the air extractor 4 and the collecting device 5 in sequence. The electric valve 6 is communicatively connected to the controller 7, and the air extractor 4 is communicatively connected to the controller 7.

[0028] In this embodiment, the coal mill slag box 2 is connected to the coal mill 1 via a slag discharge pipe. The slag box 2 is made of stainless steel for corrosion resistance and durability. A slag removal port 2a is provided on one side of the slag box 2 for periodic removal of gravel and coal particles or when the slag box 2 is fully loaded. The exhaust pipe 3 is constructed of high-temperature resistant materials to withstand high-temperature environments, such as seamless steel pipes or copper pipes. The controller 7 is equipped with a programmable logic controller 7 for precise control. The electric valve 6 utilizes a fast-response solenoid valve for rapid opening and closing. The exhaust fan 4 utilizes a high-efficiency centrifugal fan or exhaust pump. The collection device 5 utilizes a removable container, such as a dust bag or metal canister. Dust bags offer lower cost, greater convenience, and greater flexibility than metal canisters, while metal canisters offer greater loading capacity and improved sealing performance.

[0029] The coal mill slag discharge device 100 proposed in the present invention includes a coal mill slag box 2, an exhaust pipe 3, an exhaust fan 4, a collecting device 5, an electric valve 6 and a controller 7. The exhaust pipe 3 is connected to the coal mill slag box 2, the electric valve 6, the exhaust fan 4 and the collecting device 5 in sequence. The electric valve 6 is communicatively connected to the controller 7, and the exhaust fan 4 is communicatively connected to the controller 7. Before opening the coal mill slag box 2, the electric valve 6 and the exhaust fan 4 are first opened through the controller 7 to extract the high-pressure gas in the slag box and collect the dust brought out by the high-pressure gas in the collecting device 5. In this way, the positive pressure in the coal mill slag box 2 can be eliminated, and dust can be prevented from overflowing, thereby reducing the problem of dust pollution when the coal mill slag box 2 is opened.

[0030] Further, see Figures 1 to 2 In one embodiment of the utility model, an air extraction port 2b is provided on the outer wall of the coal mill slag box 2, a first annular groove 2c is provided on the periphery of the air extraction port 2b, a first sealing ring 21 is provided in the first annular groove 2c, and one end of the air extraction pipe 3 close to the coal mill slag box 2 is detachably fixedly connected to the periphery of the air extraction port 2b and abuts against the first sealing ring 21.

[0031] In this embodiment, the air exhaust port 2b is set to be circular. In actual applications, the shape of the air exhaust port 2b can be set by comprehensively considering factors such as the opening position and the shape of the pipe, and there is no limitation here. A flange is provided on the periphery of the air exhaust port 2b, and a corresponding flange is provided on one end of the air exhaust pipe 3 close to the coal mill slag box 2. The two flanges are connected by bolts to achieve the docking and fixation of the air exhaust pipe 3 and the air exhaust port 2b. Similarly, in this embodiment, this method can also be used when it is necessary to dock the pipe with the valve or the pipe with the dust collecting device. A ring groove is also provided on the periphery of the air exhaust port 2b for realizing the limiting of the sealing ring. The cross-sectional shape of the ring groove can be U-shaped, semicircular or V-shaped, and then the corresponding sealing ring is selected. The sealing ring is made of a high-temperature resistant elastic material, such as high-temperature resistant silicone or rubber.

[0032] To prevent large-sized particles from being sucked into the vacuum pump 4 and causing damage to the vacuum pump 4, please refer to Figures 2 to 3 In one embodiment of the present invention, the coal mill slag discharge device 100 also includes a filter element 22, the filter element 22 includes a support frame 221 and a filter screen 222, the filter screen 222 is arranged on the inner wall of the support frame 221, and the outer wall of the support frame 221 is detachably connected to the inner wall of the exhaust port 2b.

[0033] In this embodiment, the support frame 221 matches the shape of the air outlet 2b, and the filter 222 is fixedly connected to the inner wall of the support frame 221. The filter 222 can be replaced with a screen plate with holes. The support frame 221 is provided with a protrusion on the outside, and the inner wall of the air outlet is provided with an L-shaped slot. The filter element 22 is installed in the air outlet along the L-shaped slot, and then rotated so that the protrusion and the L-shaped slot are engaged. When the filter 222 needs to be replaced, the support frame 221 is rotated in the opposite direction, and the filter 22 can be removed and replaced, thereby achieving detachable installation and fixation of the filter 222. In addition, the detachable installation and fixation of the filter element 22 can also be achieved in the following way: by providing an external thread on the outer wall of the support frame 221 and an internal thread on the inner wall of the air outlet 2b, the filter element 22 can be rotatably installed in the air outlet 2b, and can be rotated in the opposite direction when it needs to be replaced.

[0034] Furthermore, in order to prevent the dust in the collecting device 5 from flowing back into the vacuum pump 4 after the vacuum pump 4 stops running, please refer to Figures 1 to 2 In one embodiment of the present invention, the coal mill slag discharge device 100 further includes a check valve 8 , which is disposed in the air extraction pipe 3 and located between the air extractor 4 and the collecting device 5 .

[0035] Furthermore, considering that the collecting device 5 should not occupy too much space, the capacity of the collecting device 5 is limited and needs to be cleaned frequently, please refer to Figures 1 to 2 In one embodiment of the present invention, the collecting device 5 is detachably connected to the end of the exhaust pipe 3 away from the coal mill slag box 2. In this way, the collecting device 5 can be replaced to shorten the idle time of the coal mill slag discharge device 100 and improve production efficiency.

[0036] Specifically, see Figure 2 In one embodiment of the present utility model, the collecting device 5 is a dust collecting tank, the outer wall of the dust collecting tank is provided with a dust collecting inlet, the periphery of the dust collecting inlet is provided with a second annular groove, a second sealing ring is provided in the second annular groove, and one end of the exhaust pipe 3 close to the dust collecting tank is detachably fixedly connected to the periphery of the dust collecting inlet and abuts against the second sealing ring; a roller 51 is provided at the bottom of the dust collecting tank.

[0037] In this embodiment, a dust collection inlet is provided on the top wall of the dust collection tank. A flange is provided around the dust collection inlet, and a corresponding flange is provided on the end of the exhaust pipe 3 near the dust collection tank. The two flanges are bolted together to achieve docking between the dust collection tank and the exhaust pipe 3. A second annular groove is provided around the dust collection inlet. The cross-sectional shape of the second annular groove can be configured as a U-shape, a semicircular shape, or a V-shape, and the corresponding sealing ring is selected accordingly. The sealing ring is made of a high-temperature resistant elastic material, such as high-temperature resistant silicone or rubber.

[0038] Further, see Figures 1 to 2In one embodiment of the present invention, an observation window 23 is provided on the outer wall of the coal mill slag box 2. A cleaning brush 24 is provided on the inner side of the observation window 23. The cleaning brush 24 is rotatably connected to the inner wall of the coal mill slag box 2. In this embodiment, the cleaning brush 24 is provided with a crank handle that is rotatably inserted through the outer wall of the coal mill slag box 2 and extends outside the coal mill slag box 2. By swinging the crank handle, the cleaning brush 24 is controlled to clean the inner side of the observation window 23, thereby providing a clearer view of the observation window 23. Optionally, the crank handle can be replaced with a drive motor.

[0039] Considering that after long-term use, a layer of dust will accumulate in the exhaust pipe 3, which will reduce the inner diameter of the pipe and affect the efficiency of exhaust. In order to facilitate the cleaning of dust in the pipe, please refer to Figure 2 In one embodiment of the present invention, the exhaust duct 3 is provided with an inspection port 3a. A door 31 is provided outside the inspection port 3a. The door 31 is rotatably connected to the periphery of the inspection port 3a, and the door 31 can be rotatably concealed or exposed. A sealing ring is provided around the periphery of the inspection port 3a. The door 31 is provided with a fastening lock hole, and a lock buckle is provided at a corresponding position on the inspection port 3a. When the lock hole and the lock buckle are engaged, the door 31 abuts against the sealing ring, thereby enhancing the sealing of the inspection port 3a.

[0040] The present invention also provides a coal grinding apparatus, comprising a coal mill slag discharge device 100 according to any of the aforementioned embodiments. Since this second embodiment utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects provided by the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated upon herein. The coal grinding apparatus includes a coal mill 1 and a slag discharge pipe, which connects the coal slag outlet of the coal mill 1 to the inlet of the coal mill slag box 2.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A coal mill slag discharge device, characterized in that: The coal mill slag discharge device comprises a coal mill slag discharge box (2), an air extraction pipeline (3), an air extractor (4), a collecting device (5), an electric valve (6) and a controller (7); The air extraction pipeline (3) is connected in sequence to the coal mill slag box (2), the electric valve (6), the air extractor (4) and the collecting device (5); The electric valve (6) is in communication connection with the controller (7), and the air pump (4) is in communication connection with the controller (7).

2. The coal mill slag discharge device according to claim 1, characterized in that: An air extraction port (2b) is provided on the outer wall of the coal mill slag discharge box (2), a first annular groove (2c) is provided on the periphery of the air extraction port (2b), a first sealing ring (21) is provided in the first annular groove (2c), and an end of the air extraction pipe (3) close to the coal mill slag discharge box (2) is detachably fixedly connected to the periphery of the air extraction port and abuts against the first sealing ring (21).

3. The coal mill slag discharge device according to claim 2, characterized in that: The coal mill slag discharge device further comprises a filter element, the filter element comprising a support frame (221) and a filter screen (222), the filter screen (222) being arranged on the inner wall of the support frame (221), and the outer wall of the support frame (221) being detachably connected to the inner wall of the air extraction port (2b).

4. The coal mill slag discharge device according to claim 1, characterized in that: The coal mill slag discharge device further comprises a check valve (8), which is arranged in the air extraction pipeline (3) and located between the air extractor (4) and the collecting device (5).

5. The coal mill slag discharge device according to claim 1, characterized in that: The collecting device (5) is detachably connected to the end of the air extraction pipe (3) away from the coal mill slag discharge box (2).

6. The coal mill slag discharge device according to claim 5, characterized in that: The collecting device (5) is a dust collecting bag.

7. The coal mill slag discharge device according to claim 5, characterized in that: The collecting device (5) is a dust collecting tank, the outer wall of the dust collecting tank is provided with a dust collecting inlet, the periphery of the dust collecting inlet is provided with a second annular groove, a second sealing ring is provided in the second annular groove, one end of the exhaust pipe (3) close to the dust collecting tank is detachably fixedly connected to the periphery of the dust collecting inlet and abuts against the second sealing ring; the bottom of the dust collecting tank is provided with a roller (51).

8. The coal mill slag discharge device according to claim 1, characterized in that: An observation window (23) is provided on the outer wall of the coal mill slag box (2), and a cleaning brush (24) is provided on the inner side of the observation window (23). The cleaning brush (24) is rotatably connected to the inner wall of the coal mill slag box (2).

9. The coal mill slag discharge device according to claim 1, characterized in that: The exhaust pipe (3) is provided with an inspection port (3a), and a door (31) is provided outside the inspection port (3a). The door (31) is rotatably connected to the periphery of the inspection port (3a), and the door (31) can rotatably cover or reveal the inspection port (3a).

10. A coal grinding device, characterized in that: The coal grinding equipment includes the coal grinding mill slag discharge device according to any one of claims 1 to 9.

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