Pebble coal sorting, recycling and conveying system

Abstract

The invention relates to a pebble coal sorting, recycling and conveying system which is used for solving the technical problems that manual sorting efficiency is low, material particles are not uniform in size, and pipelines are prone to being blocked. The pebble coal sorting and recycling conveying system comprises an iron removal device arranged at an outlet of a coal mill and used for removing iron-containing impurities in pebble coal, a first sorting device used for screening the pebble coal into impurities and pebble coal particles, a crushing device used for receiving the pebble coal particles and crushing the pebble coal particles into crushed particles, and a conveying pipeline used for conveying the crushed pebble coal particles to the coal mill. The conveying pipeline is connected between an outlet of the crushing device and an inlet of the coal mill and used for receiving and conveying crushed particles, the second sorting device is arranged on the conveying pipeline and used for screening the crushed particles into raw coal particles, dust and pebbles and discharging the pebbles out of the conveying pipeline, and the dust removal device is arranged on the conveying pipeline and used for removing dust from the conveying pipeline. And the dust removal device is arranged at the downstream of the second sorting device in the material flowing direction and is used for receiving the raw coal particles and dust and filtering out the dust.

Description

Technical Field

[0001] The present disclosure relates to the technical field of solid material sorting, and in particular, to a stone coal sorting and recovery and conveying system. Background Art

[0002] At present, most coal-fired thermal power plants use boiler direct-blowing pulverizing systems, and the coal mills are mainly configured as medium-speed coal mills. The medium-speed coal mills will produce pebble coal during operation. Pebble coal is mainly composed of coal gangue, broken coal blocks, stones, coal powder and other debris. At present, there are two main ways for power plants to deal with the discharged pebble coal: one is to discard it directly, and the other is to add it to the raw coal and re-enter the coal mill for grinding. Due to the general deterioration of the quality of raw coal in most power plants in China, the operation of the coal mills in the pulverizing system of power plants is generally poor, which directly causes a significant increase in the discharge of pebble coal from medium-speed coal mills, and the raw coal content in the pebble coal is relatively high.

[0003] It is a pity to directly discard the pebble coal containing more raw coal, but since pebble coal is an impurity that cannot be discharged by the coal mill, it is not suitable to add pebble coal directly to the raw coal and re-enter the coal mill for grinding. If you want to recover the raw coal in the pebble coal and prevent other impurities in the pebble coal from entering the coal mill, you must sort the pebble coal before recycling it. However, manual sorting is time-consuming and labor-intensive, with extremely low efficiency, and the particle size of the material after manual sorting is uneven, which is very easy to block the conveying pipeline. Summary of the invention

[0004] The purpose of the present invention is to provide a stone coal sorting and recovery conveying system to solve the technical problems of low efficiency of manual sorting and easy clogging of pipelines due to uneven material particle sizes.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a pebble coal sorting and recovery and conveying system, comprising: an iron removal device, arranged at the outlet of a coal mill, for receiving pebble coal and removing iron-containing impurities therein, a first sorting device, arranged at the outlet of the iron removal device, for screening the pebble coal into impurities with a particle size greater than 50 mm and pebble coal particles with a particle size not exceeding 50 mm, a crushing device, arranged below the first sorting device, for receiving the pebble coal particles and crushing them into crushed particles with a particle size less than 5 mm, a conveying pipeline, connected between the outlet of the crushing device and the inlet of the coal mill, for receiving and conveying the crushed particles, a second sorting device, arranged in the conveying pipeline, for screening the crushed particles into raw coal particles, dust and gravel, and discharging the gravel from the conveying pipeline, and a dust removal device, arranged in the conveying pipeline and arranged downstream of the second sorting device along the material flow direction, the dust removal device being used to receive the raw coal particles and the dust, and filter out the dust.

[0006] Optionally, the conveying pipeline is divided into a negative pressure conveying section and a positive pressure conveying section, the negative pressure conveying section is arranged between the outlet of the crushing device and the inlet of the dust removal device, and the positive pressure conveying section is arranged between the outlet of the dust removal device and the inlet of the coal mill.

[0007] Optionally, a negative pressure fan is provided at the inlet of the dust removal device, and the negative pressure fan can provide negative pressure for the negative pressure conveying section. A raw coal particle feeding device is provided at the outlet of the dust removal device, and the raw coal particle feeding device can provide positive pressure for the positive pressure conveying section.

[0008] Optionally, the first sorting device includes: a pebble coal hopper, which is arranged above the crushing device, and the outlet of the pebble coal hopper is connected to the inlet of the crushing device in an on-off manner; an emergency hopper, which is arranged beside the pebble coal hopper; a screen, which is arranged at the outlet of the iron removal device, the aperture of the screen is 50 mm, the screen has an initial position above the pebble coal hopper and a dumping position above the emergency hopper, and a screen flipping mechanism, which is used to flip the screen between the initial position and the dumping position.

[0009] Optionally, the screen flipping mechanism includes: a connecting rod rotatably connected to the outlet of the iron removal device, the screen is fixedly connected to the connecting rod, and a driving member for driving the connecting rod to rotate so that the connecting rod drives the screen to flip.

[0010] Optionally, the screen flipping mechanism also includes a first material level meter arranged above the screen, and the screen flipping mechanism is configured to: when the first material level meter monitors that the material level in the screen reaches a first preset material level, flip the screen to the pouring position; when the first material level meter monitors that the material level in the screen is reset to zero, reset the screen to the initial position.

[0011] Optionally, a second level meter is provided in the pebble coal hopper, and a second door panel is provided at the outlet of the pebble coal hopper. The pebble coal hopper is configured as follows: when the second level meter monitors that the material level in the pebble coal hopper reaches the second preset material level, the second door panel is controlled to open the outlet of the pebble coal hopper; when the second level meter monitors that the material level in the pebble coal hopper is reset to zero, the second door panel is controlled to close the outlet of the pebble coal hopper.

[0012] Optionally, the second sorting device includes a rotary separator and a gravel discharge hopper, the gravel discharge hopper is arranged below the rotary separator, the material inlet of the rotary separator is connected to the conveying pipeline to receive the crushed particles, the gravel outlet of the rotary separator is arranged above the gravel discharge hopper, and the dust outlet of the rotary separator is connected to the conveying pipeline.

[0013] Optionally, the dust removal device includes: a bag dust collector, used to filter the dust and discharge exhaust gas, and a raw coal particle bin, arranged downstream of the bag dust collector along the material flow direction, used to receive the raw coal particles, and the outlet of the raw coal particle bin is connected to the conveying pipeline fluid.

[0014] Optionally, a first door plate is provided at the inlet of the iron removal device, and the first door plate can control the connection between the outlet of the coal mill and the inlet of the iron removal device.

[0015] Through the above technical scheme, in the pebble coal sorting and recovery and conveying system disclosed in the present invention, the pebble coal discharged from the coal mill needs to pass through the iron removal device, the first sorting device, the crushing device, the second sorting device and the dust removal device in sequence, wherein the iron removal device can remove iron impurities in the pebble coal to avoid harmful gases generated by combustion, the first sorting device can separate impurities with larger particle sizes in the pebble coal to avoid these impurities entering the crushing device and damaging the crushing device, the crushing device can crush the pebble coal particles into crushed particles with smaller particle sizes to avoid clogging and wearing the conveying pipeline, the second sorting device can screen out the stones in the crushed particles, and the raw coal particles and dust are transported to the dust removal device through the conveying pipeline, the dust removal device can discharge the exhausted gas, and after the above-mentioned iron removal, screening and dust removal, it can be ensured that the remaining raw coal particles and dust particles are small in size and have a high raw coal content, and can be efficiently reused by the coal mill, effectively saving the power generation cost.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a pebble coal sorting and recovery conveying system in a specific embodiment of the present disclosure; Figure 2 It is a schematic diagram of the assembly of the iron removal device, the first sorting device and the crushing device in the specific embodiment of the present disclosure; Figure 3is a partial cross-sectional view of the iron removal device and the first separation device after being assembled in a specific embodiment of the present disclosure; Figure 4 It is a schematic diagram of the structure of the second sorting device.

[0018] Description of Reference Numerals 100- coal mill, 1-Iron removal device, 11-First door panel, 2-first sorting device, 20-screen, 21-stone coal hopper, 211-second door plate, 22-accident hopper, 23-screen flipping mechanism, 231-driving member, 232-connecting rod, 24-guiding channel, 3- Crushing device, 4-transport pipeline, 41-negative pressure transport section, 42-positive pressure transport section, 5-second sorting device, 50-rotating separator, 501-material inlet, 502-stone outlet, 503-dust outlet, 51-stone discharge bucket, 511-third door panel, 6-dust removal device, 61-bag dust collector, 62-raw coal particle bin, 621-fourth door panel, 7- Negative pressure fan, 8-Raw coal particle feeding device. DETAILED DESCRIPTION

[0019] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0020] In this disclosure, unless otherwise stated, directional words such as "upper" and "lower" generally refer to the upper and lower positions of the pebble coal sorting and recycling conveying system in normal use, that is, the upper and lower positions along the direction of gravity. Figures 1 to 4 In the drawing direction, "upstream" and "downstream" refer to upstream and downstream along the material flow direction, that is, the material flows from upstream to downstream, and "inside" and "outside" refer to the inside and outside relative to the contour of the corresponding component itself. The terms "first", "second", etc. used in this disclosure are to distinguish one element from another and do not have order and importance. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0021] In order to achieve the above-mentioned purpose, the present disclosure provides a pebble coal sorting and recovery and conveying system, comprising: an iron removal device 1, arranged at the outlet of a coal mill 100, for receiving pebble coal and removing iron-containing impurities therein, a first sorting device 2, arranged at the outlet of the iron removal device 1, for screening the pebble coal into impurities with a particle size greater than 50 mm and pebble coal particles with a particle size not exceeding 50 mm, a crushing device 3, arranged below the first sorting device 2, for receiving pebble coal particles and crushing them into crushed particles with a particle size less than 5 mm, a conveying pipeline 4, connected between the outlet of the crushing device 3 and the inlet of the coal mill 100, for receiving and conveying the crushed particles, a second sorting device 5, arranged on the conveying pipeline 4, for screening the crushed particles into raw coal particles, dust and gravel, and discharging the gravel from the conveying pipeline 4, and a dust removal device 6, arranged on the conveying pipeline 4, and arranged downstream of the second sorting device 5 along the material flow direction, the dust removal device 6 is used to receive raw coal particles and dust, and filter out the dust.

[0022] Through the above technical scheme, in the pebble coal sorting and recovery and conveying system disclosed in the present invention, the pebble coal discharged from the coal mill 100 needs to pass through the iron removal device 1, the first sorting device 2, the crushing device 3, the second sorting device 5 and the dust removal device 6 in sequence, wherein the iron removal device 1 can remove iron impurities in the pebble coal to avoid the combustion and generation of harmful gases, the first sorting device 2 can separate impurities with larger particle sizes in the pebble coal to avoid these impurities entering the crushing device 3 and damaging the crushing device 3, the crushing device 3 can crush the pebble coal particles into crushed particles with smaller particle sizes to avoid clogging and wearing the conveying pipeline 4, the second sorting device 5 can screen out the stones in the crushed particles, and the raw coal particles and dust are conveyed to the dust removal device 6 through the conveying pipeline 4, the dust removal device can discharge the exhaust gas, and after the above-mentioned iron removal, screening and dust removal, it can ensure that the remaining raw coal particles and dust particles are small in size and have a high raw coal content, and can be efficiently reused by the coal mill, effectively saving the power generation cost.

[0023] In order to avoid powder leakage during material transportation, refer to Figure 1 As shown, the conveying pipeline 4 can adopt a wear-resistant lining composite ceramic tube, and can be divided into a negative pressure conveying section 41 and a positive pressure conveying section 42, wherein the negative pressure conveying section 41 can be arranged between the outlet of the crushing device 3 and the inlet of the dust removal device 6, so that the material is conveyed under negative pressure before dust removal to avoid dust leakage, and the positive pressure conveying section 42 can be arranged between the outlet of the dust removal device 6 and the inlet of the coal mill 100 to convey the dust-removed material under positive pressure, thereby improving the conveying efficiency.

[0024] In order to form the negative pressure conveying section 41 and the positive pressure conveying section 42, refer to Figure 1As shown, the inlet of the dust removal device 6 may be provided with a negative pressure fan 7, which can provide negative pressure for the negative pressure conveying section 41, and the outlet of the dust removal device 6 may be provided with a raw coal particle feeding device 8, which can provide positive pressure for the positive pressure conveying section 42. The raw coal particle feeding device 8 may be a compressed air storage tank, which may be filled with compressed air for miscellaneous use in the factory.

[0025] refer to Figure 2 and Figure 3 As shown, the first sorting device 2 may include a pebble coal hopper 21, an emergency hopper 22, a screen 20 and a screen flipping mechanism 23, wherein the screen 20 is arranged at the outlet of the iron removal device 1 to receive the pebble coal from which the iron has been removed, the aperture of the screen 20 may be 50 mm, so that impurities with a particle size greater than 50 mm can be retained in the screen 20, and pebble coal particles with a particle size not exceeding 50 mm can pass through the screen 20, the pebble coal hopper 21 may be arranged above the crushing device 3, and the outlet of the pebble coal hopper 21 may be connected to the inlet of the crushing device 3 in an on-off manner, and the pebble coal hopper 21 is used to receive the pebble coal particles passing through the screen 20. The accident hopper 22 can be set beside the pebble coal hopper 21 and is used to receive impurities retained on the screen 20. In addition, when the coal mill 100 is in an accident state, the pebble coal can be directly discharged into the accident hopper 22. The screen 20 can have an initial position located above the pebble coal hopper 21 and a dumping position located above the accident hopper 22. In the initial position, the pebble coal particles passing through the screen 20 can fall into the pebble coal hopper 21. The screen flipping mechanism 23 is used to flip the screen 20 between the initial position and the dumping position.

[0026] refer to Figure 3 As shown, a first door panel 11 can be provided at the entrance of the iron removal device 1. When the material level in the accident hopper 22 reaches the alarm level, the first door panel 11 can be controlled to close to cut off the connection between the iron removal device 1 and the coal mill 100, and the accident hopper 22 can be manually transported and cleaned, and then the first door panel 11 can be opened again.

[0027] refer to Figure 3 As shown, the screen flipping mechanism 23 may include a connecting rod 232 and a driving member 231, wherein the connecting rod 232 may be rotatably connected to the outlet of the iron removal device 1, the screen 20 may be fixedly connected to the connecting rod 232, and the driving member 231 is used to drive the connecting rod 232 to rotate, so that the connecting rod 232 drives the screen 20 to flip. Specifically, the driving member 231 may be a cylinder, and the connecting rod 232 may be rotatably connected to the output end of the cylinder, and the movement of the output end of the cylinder can drive the connecting rod 232 to rotate.

[0028] In order to prevent the impurities retained on the screen 20 from overflowing due to excessive amounts of impurities, the screen flipping mechanism 23 may also include a first level meter disposed above the screen 20, and the first level meter can monitor the level of impurities in the screen 20. The screen flipping mechanism 23 may be configured to: when the first level meter detects that the level in the screen 20 reaches a first preset level, flip the screen 20 to a dumping position so that the impurities in the screen 20 can be dumped into the accident hopper 22; when the first level meter detects that the level in the screen 20 is cleared, reset the screen 20 to an initial position so that the screen 20 can continue to screen the stone coal from the iron removal device 1.

[0029] In addition, reference Figure 2 As shown, a guide channel 24 can be provided between the dumping position of the screen 20 and the accident hopper 22. The guide channel 24 can extend obliquely and be constructed as a closed channel, which can not only guide the impurities, but also allow the impurities to slide slowly, avoiding noise, dust and splashing caused by impact.

[0030] In order to save energy, a second level meter can be provided in the pebble coal hopper 21, and the second level meter can monitor the level of the pebble coal particles in the pebble coal hopper 21. The outlet of the pebble coal hopper 21 can be provided with a normally closed second door panel 211. The pebble coal hopper 21 can be configured as follows: when the second level meter monitors that the level in the pebble coal hopper 21 reaches a second preset level, the second door panel 211 is controlled to open the outlet of the pebble coal hopper 21 to unload the pebble coal particles into the crushing device 3; when the second level meter monitors that the level in the pebble coal hopper 21 is zero, the second door panel 211 is controlled to close the outlet of the pebble coal hopper 21. When the pebble coal particles enter the crushing device 3, the crushing device 3 starts to crush the pebble coal particles into crushed particles with a particle size of less than 5 mm. After that, the crushed particles are discharged into the conveying pipeline 4, and the crushing device 3 stops working and waits for the pebble coal hopper 21 to unload next time. In this way, the crushing device 3 can work intermittently to save energy.

[0031] refer to Figure 1 and Figure 4 As shown, the second sorting device 5 may include a rotary separator 50 and a gravel discharge hopper 51. The gravel discharge hopper 51 may be arranged below the rotary separator 50. The material inlet 501 of the rotary separator 50 may be connected to the conveying pipeline 4 to receive the crushed particles. The gravel outlet 502 of the rotary separator 50 may be located at the bottom of the rotary separator 50 and arranged above the gravel discharge hopper 51 so that the separated gravel can fall into the gravel discharge hopper 51. The dust outlet 503 of the rotary separator 50 may be connected to the conveying pipeline 4, so that the raw coal particles and dust will enter the conveying pipeline 4 and be conveyed to the dust removal device 6.

[0032] In addition, reference Figure 1 As shown, the gravel discharge hopper 51 may be provided with a third level meter for monitoring the gravel material level, and the bottom outlet of the gravel discharge hopper 51 may be provided with a normally closed third door panel 511, and the gravel discharge hopper 51 may be configured as follows: when the third level meter detects that the gravel material level reaches a third preset level, the third door panel 511 may be controlled to open to unload the gravel into the waste cart; when the third level meter detects that the gravel material level returns to zero, the third door panel 511 may be controlled to close.

[0033] refer to Figure 1 As shown, the dust removal device 6 may include a bag dust collector 61 and a raw coal particle bin 62 arranged in sequence along the material flow direction, the bag dust collector 61 is used to filter dust and discharge exhaust gas, the raw coal particle bin 62 is used to receive raw coal particles, and the outlet of the raw coal particle bin 62 can be fluidically connected to the conveying pipeline 4.

[0034] Specifically, the raw coal particle feeding device 8 can be arranged at the bottom outlet of the raw coal particle bin 62. Since the raw coal particle feeding device 8 can blow compressed air into the positive pressure conveying section 42, in order to save energy, a fourth material level meter can be arranged in the raw coal particle bin 62, and a fourth door panel 621 can be arranged at the bottom outlet of the raw coal particle bin 62. The fourth door panel 621 is located above the raw coal particle feeding device 8. The raw coal particle bin 62 can be configured as follows: when the fourth material level meter monitors that the raw coal particle material level reaches the fourth preset material level, the fourth door panel 621 is controlled to open, so that the raw coal particle bin 62 discharges the raw coal particles into the positive pressure conveying section 42; when the fourth material level meter monitors that the raw coal particle material level returns to zero, the fourth door panel 621 is controlled to close.

[0035] After the raw coal particle bin 62 is discharged to the positive pressure conveying section 42, the raw coal particle feeding device 8 is started to blow the raw coal particles to the inlet of the coal mill 100 through compressed air. After the raw coal particles enter the coal mill 100, the raw coal particle feeding device 8 stops supplying compressed air to the positive pressure conveying section 42 and waits for the next discharge of the raw coal particle bin 62. In this way, the raw coal particle feeding device 8 can work intermittently to save energy.

[0036] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0038] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A stone coal sorting and recovery conveying system, characterized in that: include: The iron removal device is installed at the outlet of the coal mill to receive the stone coal and remove the iron impurities therein. The first sorting device is arranged at the outlet of the iron removal device, and is used to screen the pebble coal into impurities with a particle size greater than 50 mm and pebble coal particles with a particle size not exceeding 50 mm. A crushing device is arranged below the first sorting device, and is used to receive the stone coal particles and crush them into crushed particles with a particle size of less than 5 mm. A conveying pipeline is connected between the outlet of the crushing device and the inlet of the coal mill, and is used to receive and convey the crushed particles. a second sorting device, arranged in the conveying pipeline, for screening the crushed particles into raw coal particles, dust and gravel, and discharging the gravel from the conveying pipeline, and A dust removal device is arranged in the conveying pipeline and is arranged downstream of the second sorting device along the material flow direction. The dust removal device is used to receive the raw coal particles and the dust and filter out the dust.

2. The stone coal sorting and recovery conveying system according to claim 1 is characterized in that: The conveying pipeline is divided into a negative pressure conveying section and a positive pressure conveying section. The negative pressure conveying section is arranged between the outlet of the crushing device and the inlet of the dust removal device, and the positive pressure conveying section is arranged between the outlet of the dust removal device and the inlet of the coal mill.

3. The stone coal sorting and recovery conveying system according to claim 2 is characterized in that: The inlet of the dust removal device is provided with a negative pressure fan, and the negative pressure fan can provide negative pressure for the negative pressure conveying section. The outlet of the dust removal device is provided with a raw coal particle feeding device, and the raw coal particle feeding device can provide positive pressure for the positive pressure conveying section.

4. The stone coal sorting and recovery conveying system according to claim 1, characterized in that: The first sorting device comprises: A pebble coal hopper is arranged above the crushing device, and the outlet of the pebble coal hopper is connected to the inlet of the crushing device in an on-off manner. The emergency hopper is arranged beside the stone coal hopper. A screen is arranged at the outlet of the iron removal device, the aperture of the screen is 50 mm, the screen has an initial position located above the stone coal hopper and a dumping position located above the accident hopper, and The screen flipping mechanism is used to flip the screen between the initial position and the dumping position.

5. The stone coal sorting and recovery conveying system according to claim 4 is characterized in that: The screen flipping mechanism comprises: A connecting rod is rotatably connected to the outlet of the iron removal device, and the screen is fixedly connected to the connecting rod, and The driving member is used to drive the connecting rod to rotate so that the connecting rod drives the screen to flip.

6. The stone coal sorting and recovery conveying system according to claim 4 or 5, characterized in that: The screen flipping mechanism also includes a first material level meter arranged above the screen. The screen flipping mechanism is configured as follows: When the first material level meter detects that the material level in the screen has reached a first preset material level, the screen is flipped to the dumping position; When the first material level meter detects that the material level in the screen is zero, the screen is reset to the initial position.

7. The stone coal sorting and recovery conveying system according to claim 4, characterized in that: A second material level meter is provided in the pebble coal hopper, and a second door panel is provided at the outlet of the pebble coal hopper. The stone coal hopper is configured as follows: When the second material level meter detects that the material level in the pebble coal hopper reaches the second preset material level, the second door panel is controlled to open the outlet of the pebble coal hopper; When the second material level meter detects that the material level in the pebble coal hopper is zero, the second door panel is controlled to close the outlet of the pebble coal hopper.

8. The stone coal sorting and recovery conveying system according to claim 1, characterized in that: The second sorting device includes a rotary separator and a stone discharge bucket. The stone discharge bucket is arranged below the rotary separator. The material inlet of the rotary separator is connected to the conveying pipeline to receive the crushed particles. The stone outlet of the rotary separator is arranged above the stone discharge bucket. The dust outlet of the rotary separator is connected to the conveying pipeline.

9. The stone coal sorting and recovery conveying system according to claim 1, characterized in that: The dust removal device comprises: A bag filter for filtering the dust and discharging the exhaust gas, and A raw coal particle bin is arranged downstream of the bag filter along the material flow direction and is used to receive the raw coal particles. An outlet of the raw coal particle bin is fluidly connected to the conveying pipeline.

10. The stone coal sorting and recovery conveying system according to claim 1, characterized in that: The inlet of the iron removal device is provided with a first door plate, and the first door plate can control the connection between the outlet of the coal mill and the inlet of the iron removal device.

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