A high-arsenic coal dearsenication treatment device

Abstract

The application provides a high-arsenic coal arsenic removal treatment device, which comprises a conveying belt for conveying coal, a coal overturning mechanism, a microwave ultraviolet photolysis module and a hot air system arranged above the conveying belt, the coal overturning mechanism comprises a first support installed above the conveying belt, and a plurality of distribution assemblies are arranged on the first support in the width direction of the conveying belt; the microwave ultraviolet photolysis module comprises a second support installed above the conveying belt, a quartz tube is installed on the second support, and a microwave source and an ultraviolet lamp are installed in the quartz tube; and the hot air system comprises an air blower and a cover shell installed above the conveying belt. Through the synergistic effect of the coal overturning mechanism, the microwave ultraviolet photolysis module and the hot air system, the coal is fully overturned, photolytic oxidation and hot air catalysis are realized in a closed space, the volatilization efficiency of arsenic compounds is significantly improved, the arsenic content in the coal is reduced by 50%-70%, the problem that the activity of an SCR catalyst is reduced is effectively alleviated, and the service life of the catalyst is prolonged.

Description

Technical Field

[0001] This invention relates to the field of high-arsenic coal treatment technology, and in particular to a high-arsenic coal arsenic removal treatment device. Background Technology

[0002] During SCR operation, the arsenic content in the coal was too high. The deposition of arsenic on the catalyst surface and in the micropores caused changes in its microscopic specific surface area and pore structure, which reduced the acidity and redox properties of the catalyst surface, resulting in abnormal deterioration of the catalyst activity. After 1000 hours of unit operation, the denitrification activity of the catalyst was only 69% of that of a new catalyst.

[0003] During SCR operation, we need to periodically test and evaluate the catalyst's denitrification process performance, mechanical properties, and physicochemical characteristics, which is known as catalyst life management. Through measures such as catalyst layer addition / regeneration / replacement, we ensure that the SCR denitrification performance always meets the NOx emission requirements of thermal power units while keeping ammonia slip at a low level. The chemical life of the catalyst is generally 24,000 hours (3 years), and under good operating conditions, the catalyst life can reach 50,000 hours. However, in actual operation, the catalyst may experience premature deactivation due to mechanical collapse, abnormal unit operation, chemical poisoning, etc.

[0004] Trace elements in coal, such as As, Hg, P, and Pb, come into contact with catalysts. In particular, arsenic has an inhibitory effect on the performance of SCR catalysts, reducing their activity and lifespan. Under conditions of high arsenic content, the lifespan of the catalyst can be shortened to about 8,000 hours, affecting the overall denitrification level of the unit and causing significant economic losses to thermal power plants.

[0005] Therefore, there is an urgent need to invent a device that can effectively reduce the arsenic content in high-arsenic coal in order to extend the service life of the catalyst. Summary of the Invention

[0006] This invention proposes an arsenic removal treatment device for high-arsenic coal, which solves the problems of reduced catalyst activity and shortened service life caused by the high arsenic content in high-arsenic coal in the prior art.

[0007] The technical solution of this invention is implemented as follows:

[0008] This invention provides a high-arsenic coal dearsenic treatment device, comprising a conveyor belt for transporting coal, a coal turning mechanism, a microwave ultraviolet photolysis module, and a hot air system above the conveyor belt. The coal turning mechanism includes a first support mounted above the conveyor belt, on which a plurality of distributing components are arranged along the width of the conveyor belt. The microwave ultraviolet photolysis module includes a second support mounted above the conveyor belt, on which a quartz tube is mounted, and a microwave source and an ultraviolet lamp are installed inside the quartz tube. The hot air system includes an induced draft fan and a housing mounted above the conveyor belt. The coal turning mechanism and the microwave ultraviolet photolysis module are both installed inside the housing. The induced draft fan is connected to the housing through a pipe to introduce hot air into the enclosed space formed by the housing and the conveyor belt.

[0009] This invention achieves full turning, photolysis oxidation, and hot air catalysis of coal in a closed space through the synergistic effect of a coal turning mechanism, a microwave ultraviolet photolysis module, and a hot air system. This significantly improves the volatilization efficiency of arsenic compounds, reduces the arsenic content in coal by 50%-70%, effectively alleviates the problem of reduced SCR catalyst activity, and extends the catalyst's service life.

[0010] Specifically, the sorting assembly includes a first connecting rod and a sorting block installed at the bottom of the first connecting rod, with an upper baffle installed above the sorting block; the design of the sorting block and the upper baffle can precisely control the turning amplitude of the coal seam, avoid coal block accumulation or splashing, ensure that the coal surface is evenly exposed to ultraviolet light and hot air environment, and improve arsenic volatilization efficiency.

[0011] Furthermore, the separating block is a plow or a roller. The roller is rotatably mounted on the bottom of the first connecting rod via a U-shaped frame, and the axial direction of the roller is perpendicular to the length direction of the conveyor belt. The coal blocks are turned over by the movement of the plow or roller in conjunction with the conveyor belt. The plow has a simple structure and good separating effect, while the roller can reduce the friction between the separating block and the conveyor belt and reduce wear.

[0012] Preferably, the first connecting rod includes a fixed rod and a movable rod. The fixed rod is fixedly mounted on the first bracket, and the top end of the movable rod is hinged to the bottom end of the fixed rod via a pivot. The distributing block is mounted on the bottom of the movable rod. Bearings for fixing the pivot are embedded in the opposite sidewalls of the fixed rod and the movable rod. The distributing assembly also includes a detection module, a control module, and a drive component. The detection module is used to detect the resistance of the distributing block to the coal pile on the conveyor belt. The control module is configured to control the drive component to drive the movable rod to rotate 90° around the pivot when the resistance of the distributing block is detected to be greater than a set threshold, so that the movable rod is parallel to the conveyor belt. By designing the first connecting rod as a rotatable two-section structure, when the detection module detects that the distributing block is subjected to excessive resistance, the drive component can be used to drive the movable rod to rotate 90°, thereby releasing large pieces of coal and preventing coal from blocking between adjacent distributing assemblies and causing equipment damage.

[0013] Furthermore, the driving component includes a motor, and the detection module includes a torque sensor. The motor is mounted on the outside of the fixed rod. The inner side of the movable rod has an annular groove coaxial with the bearing, and the arc-shaped inner wall of the annular groove has an internal gear ring. The output shaft of the motor passes through the inner wall of the fixed rod, and the end of the motor's output shaft has a gear that meshes with the internal gear ring. The torque sensor is mounted on the output shaft. The torque sensor can detect the torque on the output shaft, thereby indirectly measuring the resistance on the distributing block. When the resistance is too high, the output shaft can be driven to rotate by the motor, which in turn drives the internal gear ring on the inner wall of the movable rod to rotate, thereby driving the movable rod to rotate 90°, thus preventing coal blockage.

[0014] Specifically, a second connecting rod is installed on both sides of the first support, and a side baffle is installed at the bottom of the second connecting rod. The side baffle cooperates with the two side edges of the conveyor belt to prevent coal blocks from overflowing from both sides of the conveyor belt during the turning process.

[0015] Preferably, several coal turning mechanisms are provided above the conveyor belt along its length, and the distribution components of adjacent coal turning mechanisms are arranged in an alternating manner to form a continuous turning trajectory without dead angles, thereby avoiding the problem of local unprocessed coal blocks and significantly improving the uniformity of coal block turning.

[0016] Specifically, a first exhaust fan is installed on the air inlet duct at the front end of the enclosure to introduce hot air into the enclosure; several exhaust ducts are connected to the top of the middle section of the enclosure, and the outlets of these exhaust ducts are connected to an exhaust duct, which is connected to a dust collector. A second exhaust fan is installed on the exhaust duct. The cooperation of the two exhaust fans with the exhaust and exhaust ducts ensures a uniform temperature distribution within the enclosed space, accelerating arsenic volatilization; simultaneously, the dust collector efficiently filters arsenic-containing dust, preventing secondary pollution from the air discharged through the exhaust duct.

[0017] Specifically, the conveyor belt includes a first conveyor belt and a second conveyor belt with the same conveying direction. The discharge end of the first conveyor belt is located above the second conveyor belt. By setting two conveyor belts with different heights, the coal blocks are flipped 180 degrees after falling from the first conveyor belt to the second conveyor belt, turning the coal blocks at the bottom to the top. This ensures that the coal blocks on the conveyor belt are fully turned over, thereby improving the volatilization efficiency of arsenic compounds in the coal.

[0018] Preferably, a quicklime incorporation system is provided at the end of the conveyor belt. The quicklime incorporation system includes a storage tank for storing quicklime, a third conveyor belt, and a hopper. The inlet end of the third conveyor belt is located below the outlet of the storage tank, the outlet end of the third conveyor belt is located above the inlet of the hopper, and the outlet of the hopper is located above the conveyor belt. By adding a quicklime incorporation system above the conveyor belt, a small amount of quicklime is periodically incorporated into the conveyor belt. After entering the boiler, the quicklime easily reacts with arsenic at temperatures above 500°C to generate non-volatile arsenic compounds, thereby reducing the impact on the SCR catalyst. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a system architecture diagram of a high-arsenic coal arsenic removal treatment device according to the present invention;

[0021] Figure 2 This is a front structural diagram of the coal turning mechanism in an embodiment of the present invention;

[0022] Figure 3 This is a perspective view of the coal turning mechanism in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the cleaning mechanism in an embodiment of the present invention;

[0024] Figure 5 This is a partial structural diagram of the first conveyor belt and the second conveyor belt in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the quicklime incorporation system in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the distribution component in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the state of the distributing assembly after the movable lever rotates 90° in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the internal connection structure between the movable rod and the fixed rod in an embodiment of the present invention;

[0029] Figure 10 This is a partially enlarged structural diagram of the movable rod in an embodiment of the present invention;

[0030] In the diagram: 1. Conveyor belt; 2. Coal turning mechanism; 3. Microwave ultraviolet photolysis module; 4. First support; 5. Second support; 6. Quartz tube; 7. Cover; 8. First connecting rod; 9. Upper baffle; 10. Dividing block; 11. Second connecting rod; 12. Side baffle; 13. Vertical plate; 14. Telescopic mechanism; 15. Guide rail; 16. Slide frame; 17. Cleaning assembly; 18. Air inlet duct; 19. First induced draft fan; 20. Exhaust duct. ; 21. Exhaust duct; 22. Dust collector; 23. Second induced draft fan; 24. First conveyor belt; 25. Second conveyor belt; 26. Quicklime mixing system; 27. Storage tank; 28. Third conveyor belt; 29. ​​Hopper; 30. Boiler; 31. Fixed rod; 32. Movable rod; 33. Rotating shaft; 34. Bearing; 35. Motor; 36. Torque sensor; 37. Annular groove; 38. Internal gear ring; 39. Output shaft; 40. Gear. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Reference Figures 1 to 6 This invention provides a high-arsenic coal dearsenic treatment device, including a conveyor belt 1 for transporting coal. A coal turning mechanism 2, a microwave ultraviolet photolysis module 3, and a hot air system are provided above the conveyor belt 1. The coal turning mechanism 2 includes a first support 4 installed above the conveyor belt 1, with several distributing components arranged along the width of the conveyor belt 1 on the first support 4. The microwave ultraviolet photolysis module 3 includes a second support 5 installed above the conveyor belt 1, with a quartz tube 6 installed on the second support 5. A microwave source and an ultraviolet lamp (in this embodiment, the wavelength of the ultraviolet lamp is 185nm-230nm) are installed inside the quartz tube 6. The hot air system includes an induced draft fan and a housing 7 installed above the conveyor belt 1. The coal turning mechanism 2 and the microwave ultraviolet photolysis module 3 are both installed inside the housing 7 (in this embodiment, the first support 4 and the second support 5 can be directly fixed to the side wall of the housing 7). The induced draft fan is connected to the housing 7 through a pipe to introduce hot air into the enclosed space formed by the housing 7 and the conveyor belt 1.

[0033] This invention achieves full turning, photolysis, and hot air catalysis of coal in a closed space through the synergistic effect of the coal turning mechanism 2, microwave ultraviolet photolysis module 3, and hot air system. This significantly improves the volatilization efficiency of arsenic compounds, reduces the arsenic content in coal by 50%-70%, effectively alleviates the problem of reduced SCR catalyst activity, and extends the catalyst's service life.

[0034] Specifically, such as Figure 2 , 3 As shown, the sorting assembly includes a first connecting rod 8 and a sorting block 10 installed at the bottom of the first connecting rod 8. An upper baffle 9 is installed above the sorting block 10. The design of the sorting block 10 and the upper baffle 9 can precisely control the turning amplitude of the coal seam, avoid coal block accumulation or splashing, ensure that the coal surface is evenly exposed to ultraviolet light and hot air environment, and improve the arsenic volatilization efficiency.

[0035] In the specific implementation process, such as Figure 2 , 3 As shown, the first bracket 4 can be directly installed on the fixed frame of the conveyor belt 1. The first bracket 4 has an "n" shaped structure. The first connecting rod 8 has several fixing holes along its vertical direction. The first bracket 4 has mounting holes corresponding to the fixing holes. The first connecting rod 8 can be installed on the first bracket 4 with bolts. By adjusting the mounting hole position, the fixing height of the first connecting rod 8 can be adjusted, thereby adjusting the distance between the distribution block 10 and the conveyor belt 1. This avoids scratching the conveyor belt 1 if the distance is too small or poor coal turning effect if the distance is too large. In this embodiment, in order to better adapt to the arc-shaped structure of the conveyor belt 1, which is low in the middle and high on both sides, the installation height of the first connecting rod 8 on the first bracket 4 is arranged in a layout where the middle is low and the sides are high.

[0036] Furthermore, such as Figure 2 , 3 As shown, the separating block 10 is either a plow (not shown) or a roller. The roller is rotatably mounted on the bottom of the first connecting rod 8 via a U-shaped frame, and the axial direction of the roller is perpendicular to the length direction of the conveyor belt 1. The plow or roller, in conjunction with the movement of the conveyor belt 1, turns the coal blocks. The plow has a simple structure and good separating effect, while the roller can reduce the friction between the separating block 10 and the conveyor belt 1, thus reducing wear. In specific implementation, either a plow or a roller can be flexibly selected as the separating block 10 according to the actual situation.

[0037] In the specific implementation process, the first connecting rod 8 can be designed as a two-section structure, with the two sections connected by a joint. A torsion spring is sleeved on the hinge shaft. The torsion spring forces the lower section of the rod to rotate around the hinge shaft to a vertical state. When the lower section of the rod is subjected to excessive pushing force from the coal block, the lower section of the rod will overcome the elastic force of the torsion spring and rotate around the hinge shaft, thereby releasing the coal block and preventing the separating block 10 from blocking larger coal blocks.

[0038] Preferably, such as Figure 7 , 8As shown, the first connecting rod 8 includes a fixed rod 31 and a movable rod 32. The fixed rod 31 is fixedly installed on the first bracket 4. The top end of the movable rod 32 is hinged to the bottom end of the fixed rod 31 via a rotating shaft 33. The distributing block 10 is installed at the bottom of the movable rod 32. Bearings 34 for fixing the rotating shaft 33 are embedded in the opposite side walls of the fixed rod 31 and the movable rod 32. The distributing assembly also includes a detection module, a control module, and a drive component. The detection module is used to detect the resistance of the distributing block 10 to the coal pile on the conveyor belt 1. The control module is configured to control the drive component to drive the movable rod 32 to rotate 90° around the rotating shaft 33 when the resistance of the distributing block 10 is detected to be greater than a set threshold, so that the movable rod 32 is parallel to the conveyor belt 1. By designing the first connecting rod 8 as a rotatable two-section structure, when the detection module detects that the distributing block 10 is subjected to excessive resistance, the drive component can be used to drive the movable rod 32 to rotate 90°, thereby releasing large pieces of coal and preventing coal from blocking between adjacent distributing assemblies and causing equipment damage.

[0039] In this embodiment, the bearing 34 is a damping bearing, which can prevent the movable rod 32 from rotating easily. When the resistance (or thrust) of the coal block on the conveyor belt 1 on the distribution block 10 is small, it will not cause the movable rod 32 to rotate, and it shares the torque on the output shaft 39 of the motor 35. Only when the resistance of the distribution block 10 is large and can overcome the resistance of the damping bearing 34 will the torque be applied to the output shaft 39 through the internal gear ring 38 and the gear 40. When the resistance of the distribution block 10 cannot overcome the resistance of the damping bearing 34, the torque applied by the distribution block 10 is completely borne by the damping bearing 34. This can prevent the motor 35 from malfunctioning when the resistance of the distribution block 10 is small, thereby improving the reliability of the equipment operation.

[0040] Furthermore, such as Figure 9 , 10 As shown, the driving component includes a motor 35, and the detection module includes a torque sensor 36. The motor 35 is mounted on the outside of the fixed rod 31. The inner side of the movable rod 32 is provided with an annular groove 37 coaxial with the bearing 34. The arc-shaped inner wall of the annular groove 37 is provided with an internal gear ring 38. The output shaft 39 of the motor 35 passes through the inner wall of the fixed rod 31, and the end of the output shaft 39 of the motor 35 is provided with a gear 40 that meshes with the internal gear ring 38. The torque sensor 36 is mounted on the output shaft 39. The torque sensor 36 can detect the torque on the output shaft 39, thereby indirectly measuring the resistance on the distributing block 10. When the resistance is too high, the output shaft 39 can be driven to rotate by the motor 35, and the internal gear ring 38 on the inner wall of the movable rod 32 can be driven to rotate by the gear 40, thereby driving the movable rod 32 to rotate 90°, thus preventing coal blockage.

[0041] In this embodiment, the torque sensor 36 can be a clamp-type sensor or a shaft-type sensor. If a shaft-type sensor is used, the sensor input shaft and the motor 35 output shaft 39 need to be connected by a rigid coupling, and the sensor output shaft is connected to the gear 40. If a clamp-type sensor is used, the sensor needs to be fitted onto the motor 35 output shaft 39, and the clamping bolts need to be tightened evenly to avoid deformation caused by unilateral stress.

[0042] In the specific implementation process, the control module has a built-in clock unit. After the control motor 35 drives the movable rod 32 to rotate 90° for 1 second or 2 seconds, it quickly controls the motor 35 to drive the movable rod 32 to rotate 90° in the opposite direction to return to its original position.

[0043] Specifically, such as Figure 2 , 3 As shown, the first support 4 is equipped with second connecting rods 11 on both sides, and side baffles 12 are installed at the bottom of the second connecting rods 11. The side baffles 12 cooperate with the two side edges of the conveyor belt 1 to prevent coal blocks from overflowing from both sides of the conveyor belt 1 during the turning process. The second connecting rods 11 and the first support 4 are also fixedly connected by adjustable holes, which makes it convenient to flexibly adjust the installation height of the side baffles 12 according to the actual situation.

[0044] Preferably, a plurality of coal turning mechanisms 2 are provided above the conveyor belt 1 along the length direction. The distribution components of adjacent coal turning mechanisms 2 are arranged in an alternating manner to form a continuous turning trajectory without dead angles, thereby avoiding the problem of local unprocessed coal blocks and significantly improving the uniformity of coal block turning.

[0045] In this embodiment, a microwave ultraviolet photolysis module 3 is provided between two adjacent coal turning mechanisms 2. This alternating design can improve the volatilization efficiency of arsenic in coal.

[0046] Preferably, such as Figure 4 As shown, a cleaning mechanism is installed on the second support 5 for cleaning dust from the quartz tube 6. The cleaning mechanism includes a vertical plate 13 at one end of the second support 5, and a telescopic mechanism 14 is horizontally installed on the side wall of the vertical plate 13. A guide rail 15 is installed on the second support 5, and a slide 16 is slidably installed on the guide rail 15. The telescopic rod of the telescopic mechanism 14 is fixedly connected to the slide 16. Several cleaning components 17 that cooperate with the quartz tube 6 are provided on the slide 16. The telescopic mechanism 14 is used to drive the telescopic rod to extend and retract, causing the slide 16 to move linearly back and forth along the guide rail 15, thereby driving the cleaning components 17 to clean the quartz tube 6. The cleaning mechanism automatically removes the coal ash accumulated on the surface of the quartz tube 6, maintains the ultraviolet light transmittance, ensures stable photolysis efficiency, and reduces the frequency of manual maintenance and downtime.

[0047] Specifically, the cleaning assembly 17 includes a sliding sleeve (not shown in the figure), the sliding sleeve having a sliding hole that fits over the outside of the quartz tube 6, and the inner wall of the sliding hole being uniformly provided with bristles along the circumference. The design of the sliding sleeve and the bristles can closely fit the surface of the quartz tube 6, ensuring thorough cleaning, avoiding dust residue, extending the service life of the quartz tube 6, and reducing the problem of decreased photolysis efficiency due to dust accumulation.

[0048] Specifically, such as Figure 1 As shown, a first induced draft fan 19 is installed on the air inlet duct 18 at the front end of the cover 7 to introduce hot air into the interior of the cover 7; several exhaust ducts 20 are connected to the top of the middle section of the cover 7, and the outlets of the multiple exhaust ducts 20 are connected to the exhaust duct 21. The exhaust duct 21 is connected to the dust collector 22, and a second induced draft fan 23 is installed on the exhaust duct 21. Through the cooperation of the two induced draft fans, the exhaust ducts 20, and the exhaust duct 21, the temperature distribution within the enclosed space is ensured to accelerate arsenic volatilization; at the same time, the dust collector 22 efficiently filters arsenic-containing dust, preventing secondary pollution caused by the air discharged from the exhaust duct 21. In this embodiment, a material receiving port is opened on the top surface of the cover 7 at the front end of the conveyor belt 1 for receiving coal.

[0049] In this embodiment, the hot air from the first induced draft fan 19 is taken from the air heated by the filtered flue gas from the boiler 30 flue. The function of the hot air system is to raise the air temperature above the conveyor belt 1 to 40-60°C and promote air flow. It works in conjunction with the microwave ultraviolet photolysis module 3 to accelerate the volatilization of arsenic compounds.

[0050] Specifically, such as Figure 5 As shown, the conveyor belt 1 includes a first conveyor belt 24 and a second conveyor belt 25 with the same conveying direction. The discharge end of the first conveyor belt 24 is located above the second conveyor belt 25. By setting two conveyor belts with different heights, the coal blocks are flipped 180 degrees after falling from the first conveyor belt 24 to the second conveyor belt 25, turning the coal blocks at the bottom to the top. This ensures that the coal blocks on the conveyor belt are fully turned, thereby improving the volatilization efficiency of arsenic compounds in the coal.

[0051] In this embodiment, an inclined plate is installed below the discharge end of the first conveyor belt 24 to buffer the coal blocks falling from the first conveyor belt 24 and prevent the coal blocks from splashing when falling from the first conveyor belt 24 onto the second conveyor belt 25 due to the large drop.

[0052] Preferably, such as Figure 6As shown, a quicklime incorporation system 26 is provided at the end of the conveyor belt 1. The quicklime incorporation system 26 includes a storage tank 27 for storing quicklime, a third conveyor belt 28, and a hopper 29. The feed end of the third conveyor belt 28 is located below the discharge port of the storage tank 27, the discharge end of the third conveyor belt 28 is located above the feed port of the hopper 29, and the discharge port of the hopper 29 is located above the conveyor belt 1. By adding a quicklime incorporation system 26 above the conveyor belt 1, a small amount of quicklime is periodically incorporated into the conveyor belt 1. After the quicklime enters the boiler 30, it easily reacts with arsenic at temperatures above 500°C to generate non-volatile arsenic compounds, thereby reducing the impact on the SCR catalyst.

[0053] In the specific implementation process, the discharge ports of the storage tank 27 and the hopper 29 are equipped with vibrating screens. By using a vibrator in conjunction with the screen to mix quicklime into the coal pile, the quicklime can be prevented from clogging the screen.

[0054] This embodiment constructs a closed tunnel conveyor belt, or modifies an existing conveyor belt into a closed tunnel structure (i.e., installs a cover 7 on conveyor belt 1). Hot air at 40-80℃ is introduced into the coal conveying tunnel to increase the ambient temperature and airflow above the coal. A coal turning mechanism 2, a microwave ultraviolet photolysis module 3, and a hot air system are installed in the coal conveying tunnel to promote the volatilization of arsenic in the coal. At the same time, arsenic-containing coal dust generated in the coal conveying tunnel is extracted to a bag filter 22, filtered, and then the clean air is discharged into the atmosphere. This system will reduce the arsenic content in the coal of conveyor belt 1 by about 50-70%. If necessary, an appropriate amount of CaO is added to the coal at the end of the coal conveying tunnel to reduce the impact of arsenic on the catalyst after combustion in boiler 30, ensuring the activity and performance of the SCR catalyst and extending the service life of the catalyst. Reducing the arsenic content in coal can also effectively reduce ammonia escape, thereby decreasing the crystallization of ammonium bisulfate and ammonium chloride in downstream equipment, including the air preheater, dust collector 22, and induced draft fan. This protects the stable operation of downstream equipment and ensures the stable operation of the thermal power unit. This system can effectively improve the safety and economic benefits of thermal power units.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-arsenic coal arsenic removal treatment device, characterized in that, The system includes a conveyor belt (1) for transporting coal, a coal turning mechanism (2), a microwave ultraviolet photolysis module (3), and a hot air system above the conveyor belt (1). The coal turning mechanism (2) includes a first support (4) installed above the conveyor belt (1), and several sorting components are arranged on the first support (4) along the width direction of the conveyor belt (1). The microwave ultraviolet photolysis module (3) includes a second support (5) installed above the conveyor belt (1), and a quartz tube (6) is installed on the second support (5). A microwave source and an ultraviolet lamp are installed inside the quartz tube (6). The hot air system includes an induced draft fan and a cover (7) installed above the conveyor belt (1). The coal turning mechanism (2) and the microwave ultraviolet photolysis module (3) are both installed inside the cover (7). The induced draft fan is connected to the cover (7) through a pipe and is used to introduce hot air into the enclosed space formed by the cover (7) and the conveyor belt (1). The dispensing assembly includes a first connecting rod (8) and a dispensing block (10) installed at the bottom of the first connecting rod (8), with an upper baffle (9) installed above the dispensing block (10); The first connecting rod (8) includes a fixed rod (31) and a movable rod (32). The fixed rod (31) is fixedly installed on the first bracket (4). The top end of the movable rod (32) is hinged to the bottom end of the fixed rod (31) through a rotating shaft (33). The distribution block (10) is installed at the bottom of the movable rod (32). The side walls of the fixed rod (31) and the movable rod (32) are embedded with bearings (34) for fixing the rotating shaft (33). The distribution assembly also includes a detection module, a control module and a drive component. The detection module is used to detect the resistance of the distribution block (10) to the coal pile on the conveyor belt (1). The control module is configured to control the drive component to drive the movable rod (32) to rotate 90° around the rotating shaft (33) when the resistance of the distribution block (10) is detected to be greater than a set threshold, so that the movable rod (32) is parallel to the conveyor belt (1).

2. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, The separating block (10) is a plow or a roller. The roller is rotatably mounted on the bottom of the first connecting rod (8) via a U-shaped frame, and the axial direction of the roller is perpendicular to the length direction of the conveyor belt (1).

3. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, The driving component includes a motor (35), and the detection module includes a torque sensor (36). The motor (35) is installed on the outside of the fixed rod (31). The inner side of the movable rod (32) is provided with an annular groove (37) coaxial with the bearing (34). The arc-shaped inner wall of the annular groove (37) is provided with an internal gear ring (38). The output shaft (39) of the motor (35) passes through the inner wall of the fixed rod (31), and the end of the output shaft (39) of the motor (35) is provided with a gear (40) meshing with the internal gear ring (38). The torque sensor (36) is installed on the output shaft (39).

4. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, The first bracket (4) is equipped with second connecting rods (11) on both sides, and the bottom of the second connecting rods (11) is equipped with side baffles (12).

5. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, Several coal turning mechanisms (2) are provided above the conveyor belt (1) along its length, and the distribution components of adjacent coal turning mechanisms (2) are arranged alternately.

6. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, A first exhaust fan (19) is installed on the air inlet duct (18) at the front end of the cover (7) to introduce hot air into the interior of the cover (7); a number of exhaust ducts (20) are connected to the top of the middle section of the cover (7), the outlets of the multiple exhaust ducts (20) are connected to the exhaust duct (21), the exhaust duct (21) is connected to the dust collector (22), and a second exhaust fan (23) is installed on the exhaust duct (21).

7. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, The conveyor belt (1) includes a first conveyor belt (24) and a second conveyor belt (25) with the same conveying direction, and the unloading end of the first conveyor belt (24) is located above the second conveyor belt (25).

8. The high-arsenic coal arsenic removal treatment device as described in claim 1, characterized in that, The end of the conveyor belt (1) is provided with a quicklime incorporation system (26). The quicklime incorporation system (26) includes a storage tank (27) for storing quicklime, a third conveyor belt (28) and a hopper (29). The feed end of the third conveyor belt (28) is located below the discharge port of the storage tank (27), the discharge end of the third conveyor belt (28) is located above the feed port of the hopper (29), and the discharge port of the hopper (29) is located above the conveyor belt (1).

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