Pebble coal hopper capable of separating foreign matters and method for separating foreign matters in pebble coal

Abstract

The embodiment of the invention provides a pebble coal hopper capable of separating foreign matters and a method for separating foreign matters from pebble coal. The pebble coal hopper capable of separating foreign matters comprises a coal hopper body, an air inlet pipeline and an air outlet pipeline, a feeding hole is formed in the top of the coal bucket body; the first end of the air inlet pipeline is communicated with an air source, and the second end of the air inlet pipeline is inserted into the bottom of the coal bucket body; the first end of the air outlet pipeline is connected with an air extractor, and the second end of the air outlet pipeline is inserted into the bottom of the coal bucket body; when ventilation is conducted in the air inlet pipeline, an air pressure space is formed between the second end of the air inlet pipeline and the bottom of the coal bucket body, and meanwhile the second end of the air outlet pipeline absorbs pebble coal in the air pressure space under the preset air exhaust pressure in an entrainment mode so that the pebble coal can be separated from foreign matter. The pebble coal and the foreign matter are effectively separated through pneumatic force by utilizing the difference of the physical properties of the foreign matter and normal pebble coal, the problem that the foreign matter separation capacity of an existing pebble coal hopper is poor can be solved, and stable operation of a pebble coal negative-pressure pneumatic conveying system is guaranteed.

Description

Technical Field

[0001] The disclosed embodiments belong to the technical field of pebble coal hoppers, and specifically relate to a pebble coal hopper capable of separating foreign matter and a method for separating foreign matter from pebble coal. Background Art

[0002] Medium-speed coal mills are widely used in thermal power plants due to their low investment and good economic performance. During the operation of medium-speed coal mills, pebble coal is produced. The pebble coal mainly comes from the gangue and pyrite in the raw coal, which are dense and difficult to grind. When the coal mill is running, it falls below the wind ring and is sent into the pebble coal hopper by the scraper and discharged from the pebble coal discharge port at the bottom.

[0003] At present, due to the change of coal types in power plants, the quality of raw coal has generally deteriorated, and the amount of stones, gangue, ore and other debris in the raw coal has increased compared with before. The discharge of pebble coal has greatly increased, seriously affecting the safe operation of thermal power plants. At present, many domestic power plants use pebble coal negative pressure pneumatic conveying systems. Using moving airflow as the medium to transport materials is a transportation method that has long been used in industry, called pneumatic conveying. The advantages of the pneumatic conveying system are: simple equipment structure, high conveying efficiency, and good labor and health conditions. The conveying pipeline of pneumatic conveying is convenient for setting up the pipeline network according to local conditions, and the layout is simple and flexible. It can make full use of the workshop area and is easy to adapt to the workshop environment.

[0004] The pebble coal hopper is a key equipment of the pebble coal negative pressure pneumatic conveying system. Its function is to temporarily store the pebble coal discharged from the coal mill, and then feed the pebble coal into the conveying pipeline with a suitable gas-to-material ratio. Whether the pebble coal hopper works normally directly affects the normal operation of the entire pebble coal negative pressure pneumatic conveying system.

[0005] Stone coal often contains foreign matter such as iron wire and iron blocks, as well as some large stones with a particle size of more than 50mm. These foreign matter systems cannot be transported and must be separated from the stone coal hopper. The stone coal hopper currently used generally uses metal grids to separate foreign matter in actual applications, but due to the large aperture of the grid, the separation of foreign matter is very limited, resulting in system failures and shutdowns due to foreign matter in actual operation.

[0006] In view of the above problems, it is necessary to propose a pebble coal hopper and a method for separating foreign matter in pebble coal that are reasonably designed and can effectively solve the above problems. Summary of the invention

[0007] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide a pebble coal hopper capable of separating foreign matter and a method for separating foreign matter from pebble coal.

[0008] One aspect of the embodiment of the present disclosure provides a stone coal hopper capable of separating foreign matter, which is used in a stone coal negative pressure pneumatic conveying system, wherein the stone coal hopper comprises a coal hopper body, an air inlet duct and an air outlet duct; wherein:

[0009] The top of the coal hopper body is provided with a feed opening;

[0010] The first end of the air inlet duct is used to communicate with the air source, and the second end of the air inlet duct is inserted into the bottom of the coal hopper body;

[0011] The first end of the air outlet duct is used to connect with the air extraction device, and the second end of the air outlet duct is inserted into the bottom of the coal hopper body; wherein,

[0012] When ventilation is conducted in the air inlet duct, an air pressure space is formed between the second end of the air inlet duct and the bottom of the coal hopper body, and simultaneously the second end of the air outlet duct sucks the pebble coal under a preset suction pressure in the air pressure space to separate the pebble coal from foreign matter.

[0013] Optionally, the depth to which the second end of the air outlet duct is inserted into the bottom of the coal hopper body is greater than the depth to which the second end of the air inlet duct is inserted into the bottom of the coal hopper body.

[0014] Optionally, the air outlet duct is provided with a vertical section, a curved section and an inclined section which are connected in sequence from the second end to the first end.

[0015] Optionally, the air inlet duct is located in the central area of ​​the coal hopper body.

[0016] Optionally, the air inlet duct is arranged upright.

[0017] Optionally, a first sealing cover is provided at the first end of the air inlet duct, and a second sealing cover is provided at the second end of the air outlet duct.

[0018] Optionally, the feed port is provided with a third sealing cover.

[0019] Optionally, it also includes a foreign matter collection bin and a latch door;

[0020] The foreign matter collecting bin is connected to the coal hopper body, and the plug-in door is inserted between the foreign matter collecting bin and the coal hopper body.

[0021] Optionally, a collector is also included, and the collector can be drawn out and arranged in the foreign matter collection bin.

[0022] Another aspect of the disclosed embodiment provides a method for separating foreign matter from pebble coal, which is used in a pebble coal negative pressure pneumatic conveying system, and uses the pebble coal hopper capable of separating foreign matter as described above, and the method comprises:

[0023] Adding the coal containing foreign matter and stone into the coal hopper body through the feed opening, and keeping the feed opening in a sealed state;

[0024] Ventilating the air inlet duct to form an air pressure space between the second end of the air inlet duct and the bottom of the coal hopper body;

[0025] At the same time, the air outlet pipe is evacuated at a preset air extraction pressure so that the second end of the air outlet pipe can suck up the pebble coal in the air pressure space to separate the pebble coal from foreign matter.

[0026] The pebble coal hopper capable of separating foreign matters and the method for separating foreign matters from pebble coal of the disclosed embodiment, when the pebble coal hopper capable of separating foreign matters is ventilated in the air inlet duct, an air pressure space is formed between the second end of the air inlet duct and the bottom of the coal hopper body, and at the same time, the second end of the air outlet duct sucks the pebble coal under a preset suction pressure in the air pressure space and flows out of the air outlet duct, and the foreign matters in the pebble coal are retained at the bottom of the coal hopper body due to their high density, thereby separating the pebble coal from the foreign matters. The pebble coal hopper utilizes the difference in physical properties between foreign matters and normal pebble coal, and effectively separates the pebble coal from the foreign matters by pneumatic force, which can solve the problem of poor ability of the current pebble coal hopper to separate foreign matters, and ensure the stable operation of the pebble coal negative pressure pneumatic conveying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a stone coal hopper capable of separating foreign matter according to one embodiment of the present disclosure;

[0028] Figure 2 The present invention is a schematic flow chart of a method for separating foreign matter from stone coal according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1 As shown, one aspect of the embodiment of the present disclosure provides a stone coal hopper 100 capable of separating foreign matter, which is used in a stone coal negative pressure pneumatic conveying system. The stone coal hopper 100 includes a coal hopper body 110, an air inlet duct 120 and an air outlet duct 130.

[0031] The top of the coal hopper body 110 is provided with a feed port 111, and the stone coal containing foreign matter enters the coal hopper body 110 through the feed port 111. In this embodiment, the feed port 111 is located at the edge area of ​​the top of the coal hopper body 110. The foreign matter may include iron wire, iron block, etc.

[0032] The first end of the air inlet duct 120 is used to communicate with the air source, and the second end of the air inlet duct 120 is inserted into the bottom of the coal hopper body 110. Air can enter the bottom of the coal hopper body 110 through the air inlet duct 120 to form an air pressure space between the second end of the air inlet duct 120 and the bottom of the coal hopper body 110.

[0033] The first end of the air outlet duct 130 is used to be connected to the air extraction device, and the second end of the air outlet duct 130 is inserted into the bottom of the coal hopper body 110. The air pressure space of the coal hopper body 110 can be exhausted through the air outlet duct 130.

[0034] When air is ventilated in the air inlet duct 120, an air pressure space is formed between the second end of the air inlet duct 120 and the bottom of the coal hopper body 110. At the same time, the second end of the air outlet duct 130 sucks the pebble coal under a preset suction pressure in the air pressure space to separate the pebble coal from foreign matter.

[0035] It should be noted that the air outlet duct 130 can only extract the pebble coal under the preset air extraction pressure, but cannot extract the foreign matter in the pebble coal. The preset air extraction pressure can be selected according to actual needs, and this embodiment does not make any specific limitation.

[0036] Specifically, the pebble coal containing foreign matter enters the coal hopper body 110 through the feed port 111, and the feed port 111 is sealed. Air is ventilated into the air inlet duct 120 to form an air pressure space between the second end of the air inlet duct 120 and the bottom of the coal hopper body 110. At the same time, the air outlet duct 130 is evacuated at a preset air pressure so that the second end of the air outlet duct 130 sucks the pebble coal in the air pressure space, so that the air flow and the pebble coal flow out of the air outlet duct, and the foreign matter in the pebble coal is retained at the bottom of the coal hopper body due to its high density, thereby separating the pebble coal from the foreign matter.

[0037] The pebble coal hopper capable of separating foreign matter in the disclosed embodiment utilizes the difference in physical properties between foreign matter and normal pebble coal to effectively separate the pebble coal from foreign matter through pneumatic means, thereby solving the current problem of poor foreign matter separation capability of the pebble coal hopper and ensuring stable operation of the pebble coal negative pressure pneumatic conveying system.

[0038] For example, Figure 1 As shown, the depth of the second end of the air outlet duct 130 inserted into the bottom of the coal hopper body 110 is greater than the depth of the second end of the air inlet duct 120 inserted into the bottom of the coal hopper body 110. In this way, the air outlet duct 130 can extract the stone coal at the bottom of the coal hopper body 110 in the air pressure space, thereby separating the stone coal from foreign matter.

[0039] Exemplarily, the air outlet duct 130 is provided with a vertical section 131, a curved section 132 and an inclined section 133 connected in sequence from the second end to the first end thereof. The vertical section 131 is inserted in the air pressure space, the curved section 132 is curved in an arc shape and is bent toward the side wall direction of the coal hopper body 110, and the inclined section 133 is inclined obliquely upward of the coal hopper body 110.

[0040] It should be noted that the position of the inclined section 133 of the air outlet duct 130 can be set according to the space of the equipment, etc., and this embodiment does not specifically limit it.

[0041] It should be further explained that, in this embodiment, the bending angle of the bending section 132 and the inclination angle of the inclination section 133 are not specifically limited and can be selected according to actual needs.

[0042] In this embodiment, a vertical section, a curved section and an inclined section connected in sequence are provided from the second end to the first end of the air outlet duct, so that the pebble coal can be better extracted and prevented from falling back into the coal hopper body.

[0043] For example, Figure 1 As shown, the air inlet duct 120 is located in the central area of ​​the coal hopper body 110 , and can provide air pressure space at the bottom of the coal hopper body 110 to the greatest extent.

[0044] For example, Figure 1 As shown, the air inlet duct 120 is arranged upright, so that air can better enter the bottom of the coal hopper body 110, thereby better providing air pressure space.

[0045] Exemplarily, a first sealing cover is disposed at the first end of the air inlet duct 120 , and a second sealing cover is disposed at the second end of the air outlet duct 130 .

[0046] Specifically, when filling the coal hopper body 110 through the feed port 111 , the first sealing cover of the air inlet duct 120 is closed, and the second sealing cover of the air outlet duct 130 is closed at the same time, so as to prevent dust from entering the air inlet duct 120 and the air outlet duct 130 .

[0047] Exemplarily, a third sealing cover is provided at the feed port 111. Specifically, after the filling of the coal hopper body 110 is completed through the feed port 111, the third sealing cover of the feed port 111 is closed, and the first sealing cover and the second sealing cover are opened to ensure that the coal hopper body 110 maintains a negative pressure state during the process of ventilating to the air inlet duct 120 and extracting air through the air outlet duct 130.

[0048] For example, Figure 1As shown, the stone coal hopper 100 capable of separating foreign matter further includes a foreign matter collecting bin 140 and a plug-in door 150. The foreign matter collecting bin 140 is connected to the coal hopper body 110, and the plug-in door 150 is inserted between the foreign matter collecting bin 140 and the coal hopper body 110. During the air extraction process of the air outlet duct 130, the plug-in door 150 is closed. After the foreign matter separation is completed, the separated foreign matter is accumulated at the bottom of the coal hopper body 110. By opening the plug-in door 150, the foreign matter is discharged into the foreign matter collecting bin 140.

[0049] Exemplarily, the stone coal hopper 100 capable of separating foreign matter further comprises a collector 160, which is retractably arranged in the foreign matter collecting bin 140. The separated foreign matter is discharged into the collector 160, and when the collector 160 is full, the collector 160 is pulled out and the foreign matter is poured into a corresponding collecting device, and then the collector 160 is reinserted into the foreign matter collecting bin 140 to collect the foreign matter.

[0050] In this embodiment, the collector 160 is detachably disposed in the foreign matter collecting bin 140 , so that the separated foreign matter can be collected more conveniently.

[0051] like Figure 2 As shown, another aspect of the embodiment of the present disclosure provides a method S100 for separating foreign matter from pebble coal, which is used in a pebble coal negative pressure pneumatic conveying system, and adopts the pebble coal hopper 100 capable of separating foreign matter as described above, wherein the specific structure of the pebble coal hopper 100 capable of separating foreign matter has been described in detail above, and will not be repeated here. The method S100 for separating foreign matter from pebble coal may specifically include:

[0052] S110, adding coal containing foreign matter and stones into the coal hopper body through the feed port, and keeping the feed port in a sealed state.

[0053] Specifically, the first sealing cover of the air inlet duct 120 and the second sealing cover of the air outlet duct 130 are closed, the third sealing cover of the feed port 111 is opened, and the coal containing foreign matter and stones is added into the coal hopper body 110 through the feed port 111, and then the third sealing cover is closed to keep the feed port 111 in a sealed state.

[0054] S120, ventilate the air inlet duct to form an air pressure space between the second end of the air inlet duct and the bottom of the coal hopper body.

[0055] Specifically, the first sealing cover is opened, and air is ventilated into the air inlet duct 120 through the air source, so that an air pressure space is formed between the second end of the air inlet duct 120 and the bottom of the coal hopper body 110 .

[0056] S130. At the same time, the air outlet pipe is evacuated at a preset air extraction pressure, so that the second end of the air outlet pipe sucks the pebble coal in the air pressure space to separate the pebble coal from foreign matter.

[0057] Specifically, while ventilating the air inlet duct 120, the air outlet duct 130 is evacuated at a preset exhaust pressure so that the second end of the air outlet duct 130 sucks the pebble coal in the air pressure space, so that both the air flow and the pebble coal flow out from the air outlet duct, while foreign matter in the pebble coal is retained at the bottom of the coal hopper body due to its high density, thereby separating the pebble coal from the foreign matter.

[0058] The method for separating foreign matter from pebble coal in the disclosed embodiment adopts the pebble coal hopper capable of separating foreign matter as described above to separate foreign matter from the pebble coal, which can solve the problem of poor foreign matter separation ability of the current pebble coal hopper and ensure stable operation of the pebble coal negative pressure pneumatic conveying system.

[0059] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.

Claims

1. A pebble coal hopper capable of separating foreign matter, used in a pebble coal negative pressure pneumatic conveying system, characterized in that: The stone coal hopper includes a coal hopper body, an air inlet duct and an air outlet duct; wherein, The top of the coal hopper body is provided with a feed opening; The first end of the air inlet duct is used to communicate with the air source, and the second end of the air inlet duct is inserted into the bottom of the coal hopper body; The first end of the air outlet duct is used to connect with the air extraction device, and the second end of the air outlet duct is inserted into the bottom of the coal hopper body; wherein, When ventilation is conducted in the air inlet duct, an air pressure space is formed between the second end of the air inlet duct and the bottom of the coal hopper body, and simultaneously the second end of the air outlet duct sucks the pebble coal under a preset suction pressure in the air pressure space to separate the pebble coal from foreign matter.

2. The stone coal hopper according to claim 1, characterized in that: The depth to which the second end of the air outlet duct is inserted into the bottom of the coal hopper body is greater than the depth to which the second end of the air inlet duct is inserted into the bottom of the coal hopper body.

3. The stone coal hopper according to claim 1, characterized in that: The air outlet duct is provided with a vertical section, a curved section and an inclined section connected in sequence from the second end to the first end.

4. The stone coal hopper according to any one of claims 1 to 3, characterized in that: The air inlet duct is located in the central area of ​​the coal hopper body.

5. The stone coal hopper according to claim 4, characterized in that: The air inlet duct is arranged upright.

6. The stone coal hopper according to any one of claims 1 to 3, characterized in that: A first sealing cover is disposed at the first end of the air inlet duct, and a second sealing cover is disposed at the second end of the air outlet duct.

7. The stone coal hopper according to any one of claims 1 to 3, characterized in that: The feed inlet is provided with a third sealing cover.

8. The stone coal hopper according to any one of claims 1 to 3, characterized in that: It also includes a foreign matter collection bin and a latch door; The foreign matter collecting bin is connected to the coal hopper body, and the plug-in door is inserted between the foreign matter collecting bin and the coal hopper body.

9. The stone coal hopper according to any one of claims 1 to 3, characterized in that: It also includes a collector, which can be pulled out and arranged in the foreign matter collection bin.

10. A method for separating foreign matter from pebble coal, used in a pebble coal negative pressure pneumatic conveying system, characterized in that: Using the stone coal hopper capable of separating foreign matter according to any one of claims 1 to 9, the method comprises: Adding the coal containing foreign matter and stone into the coal hopper body through the feed opening, and keeping the feed opening in a sealed state; Ventilating the air inlet duct to form an air pressure space between the second end of the air inlet duct and the bottom of the coal hopper body; At the same time, the air outlet pipe is evacuated at a preset air extraction pressure so that the second end of the air outlet pipe can suck up the pebble coal in the air pressure space to separate the pebble coal from foreign matter.

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