Coal drying and desulfurization system

Abstract

The application discloses a coal drying and desulfurization system, which comprises a vibrating screen, a screening discharge belt, and an air separation and desulfurization system; the upper discharge port of the vibrating screen is located above a first conveying belt, and the lower discharge port of the vibrating screen is located above the screening discharge belt; the discharge end of the screening discharge belt and the discharge end of a drying discharge belt are both located above a third conveying belt; the air separation and desulfurization system comprises a vibrating air separation screen, a desulfurization cloth bag dust collector, an air separation fan, a clean coal belt, and a gangue belt; the vibrating air separation screen is provided with a feeding port at the top, and is provided with a screen mesh inside; a vibrating motor is arranged on the sidewall of the vibrating air separation screen and is in transmission connection with the screen mesh; an air separation pipeline is arranged in communication between an air separation air inlet and a dust removal inlet, and the air separation pipeline is provided with the air separation fan; the clean coal belt is located below the discharge port of the desulfurization cloth bag dust collector, and the gangue belt is located below a gangue discharge port.

Description

Technical field:

[0001] The present invention relates to the fields of coal dry separation and coal desulfurization, and in particular to a coal drying and desulfurization system. Background technology:

[0002] my country boasts abundant coal reserves, but low-quality coal accounts for a significant portion of these reserves. Lignite, for example, accounts for approximately 12.7% of my country's total coal reserves and is primarily found in Inner Mongolia and Yunnan. With the dwindling availability of high-quality coal in recent years, the coal industry needs to address the issue of effectively utilizing some of this low-quality coal to replace high-quality coal. Low-quality coal typically has high sulfur and moisture contents, low calorific value, and poses environmental risks when burned directly. Therefore, effectively reducing its moisture and sulfur content is essential for its effective utilization.

[0003] At present, a variety of drying equipment and desulfurization equipment have been used to improve the quality of low-quality coal, but the established production processes are mainly separate drying and separate desulfurization, which makes the overall processing process of low-quality coal longer, causes great pollution to the environment, has low production capacity, high operating costs and low degree of automation. Summary of the invention:

[0004] The object of the present invention is to provide a coal drying and desulfurization system with efficient processing flow and high degree of automation.

[0005] The present invention is implemented by the following technical scheme: a coal drying and desulfurization system, comprising a crusher, a first conveyor belt, a raw coal bin, a second conveyor belt, a drying drum, and a drying discharging belt, one side of the drying drum is provided with a drying feed port and a combustion furnace, and the other side of the drying drum is provided with a dust removal system and a drying discharging port; the first conveyor belt conveys the coal crushed by the crusher to the raw coal bin, and the second conveyor belt conveys the coal in the raw coal bin to the drying feed port, and the drying discharging belt is located below the drying discharging port; it also includes a vibrating screen, a screening discharging belt, a third conveyor belt, and an air separation and desulfurization system; the vibrating screen is arranged between the crusher and the first conveyor belt, the upper discharging port of the vibrating screen is located above the first conveyor belt, and the lower discharging port of the vibrating screen is located above the screening discharging belt; the unloading end of the screening discharging belt and the unloading end of the drying discharging belt are both located Above the third conveyor belt, the discharge end of the third conveyor belt is located above the feed port of the air separation and desulfurization system; the air separation and desulfurization system includes a vibrating air separation screen, a desulfurization bag dust collector, an air separation fan, a clean coal belt, and a gangue belt; the top of the vibrating air separation screen is provided with a feed port, the outer wall of the vibrating air separation screen is provided with a clean coal discharge port and a gangue discharge port; the vibrating air separation screen is provided with a screen mesh inclined inside, the side wall of the vibrating air separation screen is provided with a vibration motor, the vibrating The motor is connected to the screen in a transmission manner; an air separation air inlet is provided at the bottom of the vibrating air separation screen, and the air separation air inlet is connected to the positive pressure port of the air separation fan; a dust removal inlet is provided at the upper part of the desulfurization bag dust collector, and the dust removal outlet of the desulfurization bag dust collector is connected to the negative pressure port of the air separation fan; the discharge port of the desulfurization bag dust collector and the clean coal discharge port of the vibrating air separation screen are both located above the clean coal belt, and the gangue discharge port is located above the gangue belt.

[0006] Preferably, the dust removal system includes a cyclone dust collector and a drying bag dust collector; the air inlet of the cyclone dust collector is connected to the drying drum, the air outlet of the cyclone dust collector is connected to the air inlet of the drying bag dust collector, the dust outlet of the cyclone dust collector is connected to the fuel inlet of the combustion furnace through a return coal pipe, and the dust outlet of the cyclone dust collector is located above the drying discharging belt through a discharge pipe; a return coal air lock, a return coal auger, and a return coal fan are provided in sequence on the return coal pipe along the material conveying direction, and a discharge air lock and a discharge auger are provided in sequence on the discharge pipe along the material conveying direction; the air outlet of the drying bag dust collector is connected to a drying dust removal fan and a desulfurization tower in sequence through a pipe, and the dust outlet of the drying bag dust collector is located above the drying discharging belt.

[0007] Preferably, the PLC controller, the combustion furnace temperature sensor, the flue temperature sensor, the drying discharge temperature sensor are further included; the combustion furnace temperature sensor is located in the combustion furnace, the flue temperature sensor is located at the drying feed inlet, and the drying discharge temperature sensor is located at the drying discharge outlet; the combustion furnace temperature sensor, the flue temperature sensor and the drying discharge temperature sensor are electrically connected with the input end of the PLC controller; the motor of the drying roller, the drying dust removal fan, the coal return air lock, the coal return auger, the coal return fan, the discharge air lock and the discharge auger are electrically connected with the PLC controller; the fuel inlet of the combustion furnace is provided with an oxygen increasing fan and an oil pump; the oxygen increasing fan and the oil pump are electrically connected with the PLC controller.

[0008] Preferably, the drying bag dust collector is provided with a drying dust removal air lock and a drying dust removal auger which are electrically connected with the PLC controller.

[0009] Preferably, the drying bag dust collector is provided with a drying dust removal air lock and a drying dust removal auger which are electrically connected with the PLC controller.

[0010] Preferably, the desulfurization bag dust collector is provided with a desulfurization dust removal fan, and the vibration motor, the air separation fan and the desulfurization dust removal fan are electrically connected with the PLC controller.

[0011] Preferably, the motor of the crusher, the motor of the first conveying belt, the motor of the second conveying belt, the motor of the third conveying belt, the motor of the drying discharge belt, the motor of the screening discharge belt, the motor of the clean coal belt and the motor of the gangue belt are electrically connected with the PLC controller.

[0012] The application has the advantages that: the system design is reasonable, the processing flow is efficient, the crushing system, the drying system and the desulfurization system are sequentially connected, the automatic operation of the system is realized through the sensor and the PLC controller; the cyclone dust collector and the coal return pipeline are arranged in the drying system, the coal return pipeline can directly provide fuel for the combustion furnace, the use amount of external fuel is reduced, and the heat efficiency is improved; the separation of the clean coal and the gangue is realized through the air separation vibrating screen and the air separation fan, the operation is simple, and the screening efficiency is high; the air separation fan can provide positive pressure air to realize air separation, and can also provide negative pressure air to further recover the coal powder, and the air separation efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0013] 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 these drawings without paying any creative work.

[0014] Figure 1 This is a schematic diagram of the crushing system structure of Example 1 of the present invention.

[0015] Figure 2 This is a schematic structural diagram of the drying system of Example 1.

[0016] Figure 3 This is a schematic diagram of the desulfurization system structure of Example 1.

[0017] Figure 4 This is a schematic diagram of the system structure of Example 1 of the present invention.

[0018] Crushing system 1, crusher 1.1, vibrating screen 1.2, screening discharge belt 1.3, first conveyor belt 1.4, raw coal bunker 1.5, second conveyor belt 1.6, drying system 2, drying drum 2.1, drying discharge belt 2.2, drying discharge port 2.3, drying feed port 2.4, combustion furnace 2.5, fuel bunker 2.5.1, oxygen enrichment fan 2.6, oil pump 2.7, cyclone dust collector 2.8, drying bag filter 2.9, return coal pipe 2.10, return coal air lock 2.11, return coal auger 2.12, return coal fan 2.1 3. Discharge pipe 2.14, discharge air lock 2.15, discharge auger 2.16, drying and dust removal fan 2.17, desulfurization tower 2.18, drying and dust removal air lock 2.19, drying and dust removal auger 2.20, air separation and desulfurization system 3. Vibrating air separation screen 3.1, screen 3.1.1, vibration motor 3.1.2, air separation air inlet 3.1.3, gangue discharge port 3.1.4, desulfurization bag filter 3.2, desulfurization and dust removal fan 3.2.1, air separation fan 3.3, clean coal conveyor 3.4, gangue conveyor 3.5, third conveyor belt 4. Specific implementation method:

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1:

[0021] like Figure 1-4A coal drying and desulfurization system shown is provided with a crushing system 1, a drying system 2, and an air separation and desulfurization system 3 in sequence according to the material transmission direction.

[0022] The crushing system 1 includes a crusher 1.1, a vibrating screen 1.2, a screening discharge belt 1.3, a first conveyor belt 1.4, a raw coal bin 1.5, and a second conveyor belt 1.6; Figure 1 As shown, a vibrating screen 1.2 is installed between the crusher 1.1 and the first conveyor belt 1.4. The upper discharge port 1.2.1 of the vibrating screen 1.2 is located above the first conveyor belt 1.4, and the lower discharge port 1.2.2 of the vibrating screen 1.2 is located above the screening discharge belt 1.3. After separation by the vibrating screen 1.2, the finely pulverized coal is transferred to the screening discharge belt 1.3 and then to the desulfurization system. The finely pulverized coal is then transferred to the raw coal bunker 1.5 via the first conveyor belt 1.4. A second conveyor belt 1.6 transports the coal from the raw coal bunker 1.5 to the feed port of the drying system 2.

[0023] like Figure 2 As shown, the drying system 2 comprises a drying drum 2.1 and a drying discharge belt 2.2, which is located below a drying outlet 2.3. One side of the drying drum 2.1 is provided with a drying feed port 2.4 and a combustion furnace 2.5. In this embodiment, the combustion furnace 2.5 is a high-low furnace. The feed port of the combustion furnace 2.5 is connected to a coal bunker 2.5.1. The pipe connecting the combustion furnace 2.5 and the coal bunker 2.5.1 is equipped with an oxygen fan 2.6 and an oil pump 2.7. A dust removal system and the drying outlet 2.3 are located on the other side of the drying drum 2.1.

[0024] The dust removal system includes a cyclone dust collector 2.8 and a drying bag dust collector 2.9. The air inlet of the cyclone dust collector 2.8 is connected to the drying drum 2.1, and the air outlet of the cyclone dust collector 2.8 is connected to the air inlet of the drying bag dust collector 2.9. The dust outlet of the cyclone dust collector 2.8 is connected to the fuel inlet of the combustion furnace 2.5 through a coal return pipe 2.10. The dust outlet of the cyclone dust collector 2.8 also conveys part of the dried raw material to the drying discharge conveyor 2.2 through a discharge pipe 2.14.

[0025] A return coal air lock 2.11, a return coal auger 2.12, and a return coal fan 2.13 are sequentially provided on the return coal pipeline 2.10 along the material conveying direction; a discharge material air lock 2.15 and a discharge material auger 2.16 are sequentially provided on the discharge material pipeline 2.14 along the material conveying direction.

[0026] The air outlet of the drying bag dust collector 2.9 is connected to a drying dust removal fan 2.17 and a desulfurization tower 2.18 in sequence through a pipeline. The dust outlet of the drying bag dust collector 2.9 is located above the drying discharge belt 2.2. The dust outlet of the drying bag dust collector 2.9 is also equipped with a drying dust removal air lock 2.19 and a drying dust removal auger 2.20.

[0027] A third conveyor belt 4 is provided between the drying system 2 and the air separation desulfurization system 3. The unloading end of the screening discharge belt 1.3 and the unloading end of the drying discharge belt 2.2 are both located above the third conveyor belt 4. The unloading end of the third conveyor belt 4 is located above the inlet of the air separation desulfurization system 3.

[0028] like Figure 3 As shown, the air separation and desulfurization system 3 includes a vibrating air separation screen 3.1, a desulfurization bag dust collector 3.2, an air separation fan 3.3, a clean coal belt 3.4, and a gangue belt 3.5.

[0029] A feed port is provided at the top of the vibrating air separation screen 3.1, and one or more screens 3.1.1 are tilted inside the vibrating air separation screen 3.1, and the tilt angle of the screens can be adjusted according to the composition of the coal and the coal analysis results; a vibration motor 3.1.2 is provided on the side wall of the vibrating air separation screen 3.1, and the vibration motor 3.1.2 is transmission-connected to the screen 3.1.1; an air separation air inlet 3.1.3 is provided at the bottom of the vibrating air separation screen 3.1, and the air separation air inlet 3.1.3 is connected to the positive pressure port of the air separation fan 3.3; a gangue discharge port 3.1.4 and a clean coal discharge port 3.1.5 are respectively provided on the outer wall of the vibrating air separation screen 3.1; the structure and principle of the vibrating air separation screen 3.1 used in this embodiment are mature existing technologies in this field, and its specific structure will not be described in detail.

[0030] The desulfurization bag dust collector 3.2 is provided with a dust collection inlet 3.2.1, which is connected to the negative pressure port of the air separation fan 3.3. The desulfurization dust collection fan 3.2.1 is provided at the air outlet of the desulfurization bag dust collector 3.2.

[0031] The discharge port of the desulfurization bag filter 3.2 and the clean coal discharge port 3.1.5 of the vibrating air separation screen 3.1 are both located above the clean coal belt 3.4, and the gangue discharge port 3.1.4 is located above the gangue belt 3.5.

[0032] In order to realize the automatic operation of the drying desulfurization system, the system also includes a low furnace temperature sensor T1, a blast furnace temperature sensor T2, a fire channel temperature sensor T3, a drying discharge temperature sensor T4, and a PLC controller.

[0033] Among them, the low furnace temperature sensor T1 is arranged in the low furnace of the high-low furnace to monitor the combustion heat of the combustion furnace 2.5, the blast furnace temperature sensor T2 is arranged in the blast furnace of the high-low furnace to monitor the blast furnace temperature of the combustion furnace 2.5, the fire channel temperature sensor T3 is located at the drying feed port 2.4 of the combustion furnace 2.5, and the drying discharge temperature sensor is located at the drying discharge port 2.3; the above temperature sensors are all electrically connected to the PLC controller.

[0034] To achieve automatic temperature regulation of the drying system 2, the motor of the drying drum 2.1, the oxygen-enhancing fan 2.6, the oil pump 2.7, the coal return air lock 2.11, the coal return auger 2.12, the coal return fan 2.13, the unloading air lock 2.15, the unloading auger 2.16, the drying dust removal fan 2.17, the drying dust removal air lock 2.19, and the drying dust removal auger 2.20 are all electrically connected to the PLC controller.

[0035] In order to realize the automatic operation of the air separation and desulfurization system 3, the vibration motor 3.1.2, the air separation fan 3.3, and the desulfurization and dust removal fan 3.2.1 are all electrically connected to the PLC controller.

[0036] In addition, in order to automatically control the material conveying speed, the motor of the crusher 1.1, the motor of the first conveyor belt 1.4, the motor of the second conveyor belt 1.6, the motor of the third conveyor belt 4, the motor of the drying discharge belt 2.2, the motor of the screening discharge belt 1.3, the motor of the clean coal belt 3.4, and the motor of the gangue belt 3.5 are all electrically connected to the PLC controller.

[0037] The connection between the above-mentioned equipment and PLC belongs to the mature existing technology in this field and will not be described in detail here.

[0038] Instructions for use: When using the system of the present invention to dry and desulfurize coal, the process is as follows:

[0039] (1) The coal to be processed enters the crusher 1.1 for crushing, and the crushed coal falls into the vibrating screen 1.2 for sorting. Among them, the coal with larger particle size passes through the upper discharge port 1.2.1 of the vibrating screen 1.2 and enters the first conveyor belt 1.4 and is transported to the raw coal bin 1.5; the coal powder with smaller particle size passes through the lower discharge port 1.2.2 of the vibrating screen 1.2 and enters the screening discharge belt 1.3, and is directly transferred to the third conveyor belt 4 through the screening discharge belt 1.3.

[0040] (2) Drying the coal in the raw coal bin 1.5: The coal in the raw coal bin 1.5 is transported to the drying feed port 2.4 of the drying drum 2.1 via the second conveyor belt 1.6. In the initial drying stage, the PLC controller controls the oxygenation fan 2.6 and the oil pump 2.7 to start, and the fuel bin 2.5.1 supplies fuel to the combustion furnace 2.5. The PLC controller controls the drying dust removal fan 2.17 to start, and part of the coal powder in the drying drum 2.1 falls into the cyclone dust collector 2.8. At the same time, the low furnace temperature sensor T1 and the high furnace temperature sensor T2 monitor the temperature in the combustion furnace 2.5. When the low furnace temperature sensor T1 and the high furnace temperature sensor T2 detect that the temperature reaches the preset value, the PLC controller controls the oxygenation fan 2.6 and the oil pump 2.7 to turn off, and controls the return coal air shutoff device 2.11, the return coal auger 2.12 and the return coal fan 2.13 on the return coal pipe 2.10 to start, and the cyclone dust collector 2.8 supplies fuel to the combustion furnace 2.5. During this process, the PLC controller controls the opening size of the return coal auger 2.12 and the air supply volume of the return coal fan 2.13 according to the temperatures monitored by the low furnace temperature sensor T1, the blast furnace temperature sensor T2, and the fire channel temperature sensor T3.

[0041] During the drying process, the temperature of the dried coal is monitored by the drying discharge temperature sensor T4. The PLC controller controls the motor speed of the drying drum 2.1 and the air volume of the drying dust removal fan 2.17 based on the dried coal temperature, preventing the coal from being dried too hot or being incompletely dried. Under the action of the drying dust removal fan 2.17, some of the pulverized coal in the drying drum 2.1 falls into the cyclone dust collector 2.8 and the bag filter 2.9. Some of the pulverized coal in the cyclone dust collector 2.8 is then recycled into the combustion furnace 2.5 via the coal return pipe 2.10. Some of the pulverized coal in the cyclone dust collector 2.8 passes through the discharge air lock 2.15 and the discharge auger 2.16 and falls onto the drying discharge conveyor 2.2. The pulverized coal in the bag filter 2.9 passes through the drying dust removal air lock 2.19 and the drying dust removal auger 2.20 and falls onto the drying discharge conveyor 2.2.

[0042] (3) The dried coal and the screened small-particle coal powder are subjected to air separation and desulfurization: the dried coal powder is transferred to the third conveyor belt 4 via the drying discharge belt 2.2, and the small-particle coal powder is transferred to the third conveyor belt 4 via the screening discharge belt 1.3, and then transferred to the inlet at the top of the vibrating air separation screen 3.1 via the third conveyor belt 4. At the same time, the air separation fan 3.3 blows positive pressure air into the vibrating air separation screen 3.1, and the material in the vibrating air separation screen 3.1 is screened under the combined action of the vibration motor 3.1.2, the screen 3.1.1 and the positive pressure air.

[0043] Due to the large difference between the quality ratio of coal gangue and clean coal, the material in the vibration air separation screen 3.1 is screened into a clean coal layer and a gangue layer; then the clean coal and the gangue respectively fall into the clean coal belt 3.4 and the gangue belt 3.5 through the corresponding discharge ports. After the air separation is completed, the desulfurization bag-type dust collector 3.2 starts to work, and the air separation fan 3.3 and the desulfurization dust removal fan 3.2.1 enter a negative pressure adsorption state, so that the coal powder in the vibration air separation screen 3.1 is sucked into the bag-type dust collector 3.2, and the coal powder in the desulfurization bag-type dust collector 3.2 falls from the bottom dust removal port onto the clean coal belt 3.4.

[0044] The above description is merely preferred embodiments of the present application but not to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coal drying and desulfurization system, comprising a crusher, a first conveyor belt, a raw coal bin, a second conveyor belt, a drying drum, and a drying discharge belt, wherein a drying feed port and a combustion furnace are provided on one side of the drying drum, and a dust removal system and a drying discharge port are provided on the other side of the drying drum; the first conveyor belt conveys the coal crushed by the crusher to the raw coal bin, the second conveyor belt conveys the coal in the raw coal bin to the drying feed port, and the drying discharge belt is located below the drying discharge port; characterized in that It also includes a vibrating screen, a screening discharge belt, a third conveyor belt, and an air separation and desulfurization system; The vibrating screen is provided between the crusher and the first conveyor belt, the upper discharge port of the vibrating screen is located above the first conveyor belt, and the lower discharge port of the vibrating screen is located above the screening discharge belt; The discharge end of the screening discharge belt and the discharge end of the drying discharge belt are both located above the third conveyor belt, and the discharge end of the third conveyor belt is located above the inlet of the air separation desulfurization system; The air separation and desulfurization system includes a vibrating air separation screen, a desulfurization bag dust collector, an air separation fan, a clean coal belt, and a gangue belt; The vibrating air separation screen is provided with a feed port on the top, and a clean coal discharge port and a gangue discharge port are provided on the outer wall of the vibrating air separation screen; a screen is provided obliquely inside the vibrating air separation screen, and a vibration motor is provided on the side wall of the vibrating air separation screen, and the vibration motor is connected to the screen in a transmission manner; The inclination angle of the screen can be adjusted according to the composition of the coal and the coal analysis results; The bottom of the vibrating air separation screen is provided with an air separation air inlet, which is connected to the positive pressure port of the air separation fan; the upper part of the desulfurization bag dust collector is provided with a dust removal inlet, and the dust removal outlet of the desulfurization bag dust collector is connected to the negative pressure port of the air separation fan; The discharge port of the desulfurization bag dust collector and the clean coal discharge port of the vibrating air separation screen are both located above the clean coal belt, and the gangue discharge port is located above the gangue belt; The dust removal system includes a cyclone dust collector and a drying bag dust collector; The air inlet of the cyclone dust collector is connected to the drying drum, the air outlet of the cyclone dust collector is connected to the air inlet of the drying bag dust collector, the dust outlet of the cyclone dust collector is connected to the fuel inlet of the combustion furnace through a coal return pipe, and the dust outlet of the cyclone dust collector is located above the drying discharge belt through a discharge pipe; The return coal pipe is provided with a return coal air lock, a return coal auger, and a return coal fan in sequence along the material conveying direction, and the discharge material pipe is provided with a discharge material air lock and a discharge material auger in sequence along the material conveying direction; The air outlet of the drying bag dust collector is connected to a drying dust removal fan and a desulfurization tower in sequence through pipelines. The dust outlet of the drying bag dust collector is located above the drying discharge belt.

2. A coal drying and desulfurization system according to claim 1, characterized in that: It also includes a PLC controller, a combustion furnace temperature sensor, a fire channel temperature sensor, and a drying discharge temperature sensor; the combustion furnace temperature sensor is located inside the combustion furnace, the fire channel temperature sensor is located at the drying feed port, and the drying discharge temperature sensor is located at the drying discharge port; The combustion furnace temperature sensor, the fire channel temperature sensor, and the drying discharge temperature sensor are all electrically connected to the input end of the PLC controller; The motor of the drying drum, the drying dust removal fan, the coal return air lock, the coal return auger, the coal return fan, the unloading air lock, and the unloading auger are all electrically connected to the PLC controller; An oxygen-enriching fan and an oil pump are provided at the fuel inlet of the combustion furnace; the oxygen-enriching fan and the oil pump are both electrically connected to the PLC controller.

3. A coal drying and desulfurization system according to claim 2, characterized in that: A drying dust removal air shutoff device and a drying dust removal auger electrically connected to the PLC controller are respectively provided at the dust outlet of the drying bag dust collector.

4. A coal drying and desulfurization system according to claim 3, characterized in that: A desulfurization dust removal fan is provided at the air outlet of the desulfurization bag dust collector, and the vibration motor, the air separation fan, and the desulfurization dust removal fan are all electrically connected to the PLC controller.

5. A coal drying and desulfurization system according to any one of claims 2 to 4, characterized in that: The motor of the crusher, the motor of the first conveyor belt, the motor of the second conveyor belt, the motor of the third conveyor belt, the motor of the drying discharging belt, the motor of the screening discharging belt, the motor of the clean coal belt, and the motor of the gangue belt are all electrically connected to the PLC controller.

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