Arsenic removal treatment device for high-arsenic coal

Abstract

The invention provides a high-arsenic coal arsenic removal treatment device which comprises a conveying belt used for conveying coal, a coal turning mechanism, a microwave ultraviolet photolysis module and a hot air system are arranged above the conveying belt, the coal turning mechanism comprises a first support installed above the conveying belt, and a plurality of distribution assemblies are distributed on the first support in the width direction of the conveying belt; the microwave ultraviolet photolysis module comprises a second support mounted above the conveying belt, a quartz tube is mounted on the second support, and a microwave source and an ultraviolet lamp are mounted in the quartz tube; the hot air system comprises an induced draft fan and a housing installed above the conveying belt. Through the synergistic effect of the coal turning mechanism, the microwave ultraviolet photolysis module and the hot air system, full turning, photolysis oxidation and hot air catalysis of coal are achieved in a closed space, the volatilization efficiency of arsenic compounds is remarkably 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 relieved, and the service life of the catalyst is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of high-arsenic coal treatment, and particularly to a high-arsenic coal arsenic removal treatment device. Background Art

[0002] During the operation of SCR, when the arsenic content in coal is too high, the deposition of arsenic on the surface and in the micropores of the catalyst causes changes in its microscopic specific surface area and pore structure, reducing the surface acid amount and redox characteristics of the catalyst, resulting in abnormal deterioration of the catalyst activity. The denitration activity of the catalyst when the unit operates for 1000 h is only 69% of that of the new catalyst.

[0003] During the operation of SCR, we need to regularly detect and evaluate the denitration process performance, mechanical performance, and physical and chemical properties of the catalyst, that is, catalyst life management. By measures such as installing / regenerating / replacing the catalyst layer, while controlling the ammonia slip at a low level, the SCR denitration performance always meets the NOx emission requirements of thermal power units. The chemical life period of the catalyst is generally 24000 h (3 years), and in some cases with better operating conditions, the service life of the catalyst can reach 50000 h. However, during the actual operation process, the catalyst may be deactivated prematurely due to mechanical collapse, abnormal unit operation, chemical poisoning, etc.

[0004] Trace elements in coal, such as As, Hg, P, Pb, etc., come into contact with the catalyst. Especially, arsenic has an inhibitory effect on the performance of the SCR catalyst, which will reduce the activity of the catalyst and shorten its service life. When the arsenic content is relatively high, the service life of the catalyst will be shortened to about 8000 h, affecting the overall denitration level of the unit and causing greater 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 to extend the service life of the catalyst. Summary of the Invention

[0006] The present invention provides a high-arsenic coal arsenic removal treatment device, which solves the problems in the prior art that due to the high arsenic content in high-arsenic coal, the catalyst activity is reduced and the service life is shortened.

[0007] The technical solution of the present invention is realized as follows:

[0008] The present invention provides a high-arsenic coal arsenic removal treatment device, including a conveyor belt for conveying coal. Above the conveyor belt, there are a coal turning mechanism, a microwave ultraviolet photolysis module, and a hot air system. The coal turning mechanism includes a first bracket installed above the conveyor belt, and a number of dialing components are arranged on the first bracket along the width direction of the conveyor belt; the microwave ultraviolet photolysis module includes a second bracket installed above the conveyor belt, and a quartz tube is installed on the second bracket, and a microwave source and an ultraviolet lamp are installed in the quartz tube; the hot air system includes an induced draft fan and a housing installed above the conveyor belt. The coal turning mechanism and the microwave ultraviolet photolysis module are both installed in the housing, and the induced draft fan is connected to the housing through a pipeline for introducing hot air into the closed space formed by the housing and the conveyor belt.

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

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

[0011] Furthermore, the dialing block is a plow head or a roller. The roller is rotatably installed at the bottom of the first connecting rod through 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 by the cooperation of the plow head or the roller and the movement of the conveyor belt. The plow head has a simple structure and good dialing effect, and the roller can reduce the friction between the dialing 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 installed on the first bracket, the top end of the movable rod is hinged to the bottom end of the fixed rod through a rotating shaft, and the dialing block is installed at the bottom of the movable rod; bearings for fixing the rotating shaft are embedded in the opposite side walls of the fixed rod and the movable rod; the dialing component further includes a detection module, a control module, and a driving component. The detection module is used to detect the resistance of the dialing block to the coal pile on the conveyor belt. The control module is configured to control the driving component to drive the movable rod to rotate 90° around the rotating shaft when it detects that the resistance received by the dialing block is greater than the 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 resistance received by the dialing block is too large, the driving component can be used to drive the movable rod to rotate 90°, thereby releasing large coal blocks and avoiding equipment damage caused by coal block jamming between adjacent dialing components.

[0013] Furthermore, the driving component includes a motor, and the detection module includes a torque sensor. The motor is installed outside the fixed rod. An annular groove coaxial with the bearing is provided on the inner side surface of the movable rod. An internal gear ring is provided on the arc-shaped inner wall of the annular groove. The output shaft of the motor penetrates the inner wall of the fixed rod, and a gear meshing with the internal gear ring is provided at the end of the output shaft of the motor. The torque sensor is installed on the output shaft. The torque sensor can detect the torque received by the output shaft, thereby indirectly measuring the resistance received by the sorting block. When the resistance is too large, the output shaft can be driven to rotate by the motor, and the internal gear ring on the inner wall of the movable rod can be driven to rotate by means of the gear, thereby driving the movable rod to rotate 90°, thus avoiding the blockage of coal blocks.

[0014] Specifically, second connecting rods are installed on both sides of the first bracket, and side baffles are installed at the bottoms of the second connecting rods. The side baffles cooperate with the two side edges of the conveyor belt, which can prevent coal blocks from overflowing from both sides of the conveyor belt during the turning process.

[0015] Preferably, a plurality of coal turning mechanisms are provided along the length direction above the conveyor belt. The sorting components of adjacent coal turning mechanisms are arranged staggeredly, forming a continuous and dead-angle-free turning track, avoiding the problem of local untreated coal blocks, and significantly improving the uniformity of coal block turning.

[0016] Specifically, a first induced draft fan is installed on the air inlet pipe at the front end of the housing for introducing hot air into the interior of the housing. A plurality of exhaust pipes are connected to the top of the middle section of the housing. The outlets of the plurality of exhaust pipes are connected to an exhaust duct, and the exhaust duct is connected to a dust collector. A second induced draft fan is installed on the exhaust duct. Through the cooperation of the two induced draft fans with the exhaust pipes and the exhaust duct, it is ensured that the temperature is evenly distributed in the enclosed space, accelerating the volatilization of arsenic. At the same time, in combination with the efficient filtration of arsenic-containing dust by the dust collector, secondary pollution caused by the air discharged from the exhaust duct is avoided.

[0017] Specifically, the conveyor belt includes a first conveyor belt and a second conveyor belt with the same conveying direction. The discharging 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 turned 180 degrees after falling from the first conveyor belt to the second conveyor belt, turning the coal blocks at the bottom to the top surface, so that the coal blocks on the conveyor belt are fully turned, 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 feeding end of the third conveyor belt is located below the discharge opening of the storage tank, the discharging end of the third conveyor belt is located above the feeding opening of the hopper, and the discharging opening 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 regularly incorporated onto the conveyor belt. After the quicklime enters the boiler, it easily reacts with arsenic at temperatures above 500°C to form non-volatile arsenic compounds, thereby reducing the impact on the SCR catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

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

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

[0022] Figure 3 It is a three-dimensional diagram of the coal turning mechanism in an embodiment of the present invention;

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

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

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

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

[0027] Figure 8 It is a state schematic diagram of the distribution component after the movable rod rotates 90° in an embodiment of the present invention;

[0028] Figure 9 It is an internal connection structural schematic diagram of the movable rod and the fixed rod in an embodiment of the present invention;

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

[0030] In the figure: 1, conveyor belt; 2, coal turning mechanism; 3, microwave ultraviolet photolysis module; 4, first support; 5, second support; 6, quartz tube; 7, housing; 8, first connecting rod; 9, upper baffle; 10, distribution block; 11, second connecting rod; 12, side baffle; 13, vertical plate; 14, telescopic mechanism; 15, guiding slide rail; 16, carriage; 17, cleaning assembly; 18, air inlet duct; 19, first induced draft fan; 20, exhaust duct; 21, exhaust air duct; 22, dust collector; 23, second induced draft fan; 24, first conveyor belt; 25, second conveyor belt; 26, quicklime incorporation 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. Specific embodiments

[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] Referring to Figures 1 to 6 , the present invention provides a high-arsenic coal arsenic removal treatment device, including a conveyor belt 1 for conveying coal. Above the conveyor belt 1, there are arranged a coal turning mechanism 2, a microwave ultraviolet photolysis module 3 and a hot air system. The coal turning mechanism 2 includes a first support 4 installed above the conveyor belt 1, and a plurality of distribution 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, a quartz tube 6 is installed on the second support 5, and a microwave source and an ultraviolet lamp (the wavelength of the ultraviolet lamp in this embodiment is 185 nm - 230 nm) are installed in 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 in the housing 7 (in this embodiment, the first support 4 and the second support 5 can be directly fixed on the side wall of the housing 7). The induced draft fan is connected to the housing 7 through a pipeline for introducing hot air into the closed space formed by the housing 7 and the conveyor belt 1.

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

[0034] Specifically, as Figure 2 and 3 shown, the sorting component 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 accurately control the turning amplitude of the coal seam, avoid coal block accumulation or splashing, ensure that the coal surface is evenly exposed to the ultraviolet light and hot air environment, and improve the arsenic volatilization efficiency.

[0035] During the specific implementation process, as Figure 2 and 3 shown, the first bracket 4 can be directly installed on the fixed frame of the conveyor belt 1. The first bracket 4 is of an "n" - shaped structure. A plurality of fixing holes are arranged vertically on the first connecting rod 8, and assembly holes corresponding to the fixing holes are arranged on the first bracket 4. The first connecting rod 8 can be installed on the first bracket 4 through bolts, and by adjusting the installation hole positions, the fixing height of the first connecting rod 8 can be adjusted, so as to adjust the distance between the sorting block 10 and the conveyor belt 1, avoiding scratching the conveyor belt 1 due to too small a distance or poor coal turning effect due to too large a distance. In this embodiment, in order to better adapt to the arc - shaped structure of the conveyor belt 1 with a lower middle part and higher sides, the installation height of the first connecting rod 8 on the first bracket 4 is in a layout form with a lower middle part and higher sides.

[0036] Furthermore, as Figure 2 and 3 shown, the sorting block 10 is a plow head (not shown in the figure) or a roller. The roller is rotatably installed at the bottom of the first connecting rod 8 through a U - shaped frame, and the axial direction of the roller is perpendicular to the length direction of the conveyor belt 1. The coal blocks are turned by the cooperation of the plow head or the roller and the movement of the conveyor belt 1. The plow head has a simple structure and good sorting effect, and the roller can reduce the friction between the sorting block 10 and the conveyor belt 1 and reduce wear. During the specific implementation process, the plow head or the roller can be flexibly selected as the sorting block 10 according to the actual situation.

[0037] During the specific implementation process, the first connecting rod 8 can be designed as a two - section structure. The two sections of the rod are hinged through a joint, and 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 the vertical state. When the thrust of the coal block on the lower section of the rod is too large, the lower section of the rod will rotate around the hinge shaft against the elastic force of the torsion spring, thereby releasing the coal block and avoiding the sorting block 10 from blocking larger coal blocks.

[0038] Preferably, as Figure 7 and 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 through a rotating shaft 33. The sorting 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 sorting assembly further includes a detection module, a control module, and a driving component. The detection module is used to detect the resistance of the sorting block 10 against the coal pile on the conveyor belt 1. The control module is configured to control the driving component to drive the movable rod 32 to rotate 90° around the rotating shaft 33 when it is detected that the resistance received by the sorting block 10 is 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 resistance received by the sorting block 10 is too large, the driving component can be used to drive the movable rod 32 to rotate 90°, thereby releasing large coal blocks and avoiding equipment damage caused by blockage between adjacent sorting components.

[0039] In this embodiment, the bearing 34 adopts 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 received by the sorting block 10 is small, it will not cause the movable rod 32 to rotate, and it shares the torque received by the output shaft 39 of the motor 35. Only when the resistance received by the sorting block 10 is large enough to overcome the resistance of the damping bearing 34, the inner gear ring 38 and the gear 40 will apply torque to the output shaft 39. When the resistance received by the sorting block 10 cannot overcome the resistance of the damping bearing 34, the damping bearing 34 completely bears the torque applied by the sorting block 10, which can prevent the motor 35 from malfunctioning when the resistance received by the sorting block 10 is small, thereby improving the reliability of equipment operation.

[0040] Further, as Figure 9 、 10 shown, the driving component includes a motor 35, the detection module includes a torque sensor 36, and the motor 35 is installed outside the fixed rod 31. An annular groove 37 coaxial with the bearing 34 is provided on the inner side surface of the movable rod 32. The inner arc wall of the annular groove 37 is provided with an inner gear ring 38. The output shaft 39 of the motor 35 penetrates the inner wall of the fixed rod 31, and a gear 40 meshing with the inner gear ring 38 is provided at the end of the output shaft 39 of the motor 35. The torque sensor 36 is installed on the output shaft 39. The torque received by the output shaft 39 can be detected through the torque sensor 36, so as to indirectly measure the resistance received by the sorting block 10. When the resistance is too large, the output shaft 39 can be driven to rotate by the motor 35, and the inner gear ring 38 on the inner wall of the movable rod 32 can be driven to rotate by means of the gear 40, thereby driving the movable rod 32 to rotate 90°, thus avoiding coal block blockage.

[0041] In this embodiment, the torque sensor 36 can adopt a clamping sensor or a shaft sensor. If a shaft sensor is adopted, the input shaft of the sensor and the output shaft 39 of the motor 35 need to be connected by a rigid coupling, and the output shaft of the sensor is connected to the gear 40. If a clamping sensor is adopted, the sensor needs to be sleeved on the output shaft 39 of the motor 35, and the clamping bolts are evenly tightened to avoid deformation caused by unilateral stress.

[0042] During the specific implementation process, the control module is built with a clock unit. When controlling the motor 35 to drive the movable rod 32 to rotate 90° for 1 s or 2 s, the motor 35 is quickly controlled to drive the movable rod 32 to rotate 90° in the reverse direction to return to the original position.

[0043] Specifically, as Figure 2 、 3 shown, the two sides of the first bracket 4 are installed with second connecting rods 11. The bottom of the second connecting rod 11 is installed with side baffles 12. The side baffles 12 cooperate with the two side edges of the conveyor belt 1, which can prevent coal blocks from overflowing from both sides of the conveyor belt 1 during the turning process. The second connecting rod 11 and the first bracket 4 are also fixedly connected through adjustable hole positions, which is convenient for flexibly adjusting the installation height of the side baffle 12 according to the actual situation.

[0044] Preferably, a plurality of coal turning mechanisms 2 are arranged along the length direction above the conveyor belt 1. The distribution components of adjacent coal turning mechanisms 2 are arranged staggeredly, forming a continuous and non-dead-angle turning track, avoiding the problem of local untreated 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. Through this alternating design, the volatilization efficiency of arsenic in coal can be improved.

[0046] Preferably, as Figure 4 shown, a cleaning mechanism is installed on the second bracket 5 for cleaning the dust on the quartz tube 6. The cleaning mechanism includes a vertical plate 13 provided at one end of the second bracket 5, and a telescopic mechanism 14 is horizontally installed on the side wall of the vertical plate 13. A guiding slide rail 15 is installed on the second bracket 5, and a sliding frame 16 is slidably installed on the guiding slide rail 15. The telescopic rod of the telescopic mechanism 14 is fixedly connected to the sliding frame 16. A plurality of cleaning components 17 cooperating with the quartz tube 6 are provided on the sliding frame 16. The telescopic mechanism 14 is used to drive the telescopic rod to stretch and drive the sliding frame 16 to linearly reciprocate along the guiding slide 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 the stability of the photolysis efficiency, and reduces the manual maintenance frequency and downtime.

[0047] Specifically, the cleaning component 17 includes a sliding sleeve (not shown in the figure). The sliding hole of the sliding sleeve is sleeved outside the quartz tube 6, and bristles are evenly arranged along the circumferential direction on the inner wall of the sliding hole. The design of the sliding sleeve and the bristles can closely fit the surface of the quartz tube 6, ensuring thorough cleaning effect, avoiding dust residue, prolonging the service life of the quartz tube 6, and at the same time reducing the problem of decreased photolysis efficiency caused by dust accumulation.

[0048] Specifically, as Figure 1 shown, a first induced draft fan 19 is installed on the air inlet duct 18 at the front end of the housing 7 to introduce hot air into the interior of the housing 7; several exhaust ducts 20 are connected to the top of the middle section of the housing 7, and the outlets of the multiple exhaust ducts 20 are connected to an exhaust duct 21, the exhaust duct 21 is connected to a 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 with the exhaust ducts 20 and the exhaust duct 21, it is ensured that the temperature is evenly distributed in the enclosed space, accelerating the volatilization of arsenic; at the same time, combined with the high-efficiency filtration of arsenic-containing dust by the dust collector 22, secondary pollution caused by the air discharged from the exhaust duct 21 is avoided. In this embodiment, a material receiving port is provided on the top surface of the housing 7 at the front end of the conveyor belt 1 for receiving coal.

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

[0050] Specifically, as Figure 5 shown, the conveyor belt 1 includes a first conveyor belt 24 and a second conveyor belt 25 with the same conveying direction. The discharging 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 surface, so that the coal blocks on the conveyor belt are fully turned over, thereby improving the volatilization efficiency of arsenic compounds in the coal.

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

[0052] Preferably, as Figure 6As shown in the figure, 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 feeding end of the third conveyor belt 28 is located below the discharging port of the storage tank 27, the discharging end of the third conveyor belt 28 is located above the feeding port of the hopper 29, and the discharging 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 regularly incorporated onto the conveyor belt 1. After the quicklime enters the boiler 30, it is very easy to react with arsenic at a temperature above 500°C to form non-volatile arsenic compounds, thereby reducing the impact on the SCR catalyst.

[0053] During the specific implementation process, vibrating screens are provided at the discharging ports of the storage tank 27 and the hopper 29. By using a vibrator in cooperation with the screen, quicklime can be incorporated into the coal pile, which can prevent the quicklime from clogging the screen.

[0054] In this embodiment, by constructing a closed tunnel-type conveyor belt or transforming the existing conveyor belt into a closed tunnel structure (i.e., installing a housing 7 on the conveyor belt 1), hot air at 40 - 80°C is introduced into the coal conveying tunnel to increase the ambient temperature and the air flow 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, the arsenic-containing coal dust generated in the coal conveying tunnel is pumped into a bag filter 22, and the coal dust is filtered and then the clean air is discharged into the atmosphere. This system will reduce the arsenic content in the coal on the conveyor belt 1 by about 50 - 70%. And appropriate amount of CaO is incorporated into the coal at the end of the coal conveying tunnel as needed to reduce the impact of arsenic on the catalyst after the boiler 30 burns, ensure the activity and performance of the SCR catalyst, and extend the service life of the catalyst. Reducing the arsenic content in the coal can also effectively reduce the ammonia slip, reduce the crystallization of ammonium bisulfate and ammonium chloride in the post-furnace equipment including the air preheater, the dust collector 22, and the induced draft fan, protect the stable operation of the post-furnace equipment, and ensure the stable operation of the thermal power unit. This system can effectively provide the safety and economic benefits of the thermal power unit.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-arsenic coal arsenic removal treatment device, characterized in that It includes a conveyor belt (1) for conveying coal. Above the conveyor belt (1), there are a coal-turning mechanism (2), a microwave ultraviolet photolysis module (3) and a hot air system. The coal-turning mechanism (2) includes a first support (4) installed above the conveyor belt (1). Along the width direction of the conveyor belt (1), a number of distribution components are arranged on the first support (4); the microwave ultraviolet photolysis module (3) includes a second support (5) installed above the conveyor belt (1). 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 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). The induced draft fan is connected to the housing (7) through a pipeline for introducing hot air into the closed space formed by the housing (7) and the conveyor belt (1).

2. The high-arsenic coal arsenic removal treatment device according to claim 1, characterized in that, The distribution component includes a first connecting rod (8) and a distribution block (10) installed at the bottom of the first connecting rod (8). An upper baffle (9) is installed above the distribution block (10).

3. The arsenic removal treatment device for high-arsenic coal according to claim 2, characterized in that, The distribution block (10) is a plow head or a roller. The roller is rotatably installed at the bottom of the first connecting rod (8) through a U-shaped frame, and the axial direction of the roller is perpendicular to the length direction of the conveyor belt (1).

4. The arsenic removal treatment device for high-arsenic coal according to claim 2, characterized in that 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 support (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); bearings (34) for fixing the rotating shaft (33) are embedded on the opposite side walls of the fixed rod (31) and the movable rod (32); the distribution component further includes a detection module, a control module and a driving 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 driving component to drive the movable rod (32) to rotate 90° around the rotating shaft (33) when it detects that the resistance received by the distribution block (10) is greater than the set threshold, so that the movable rod (32) is parallel to the conveyor belt (1).

5. The arsenic removal treatment device for high-arsenic coal according to claim 4, wherein, The driving component includes a motor (35). The detection module includes a torque sensor (36). The motor (35) is installed outside the fixed rod (31); an annular groove (37) coaxial with the bearing (34) is provided on the inner side surface of the movable rod (32). An internal gear ring (38) is provided on the arc-shaped inner wall of the annular groove (37). The output shaft (39) of the motor (35) penetrates the inner wall of the fixed rod (31), and a gear (40) meshing with the internal gear ring (38) is provided at the end of the output shaft (39) of the motor (35). The torque sensor (36) is installed on the output shaft (39).

6. The arsenic removal treatment device for high-arsenic coal according to claim 1, wherein Second connecting rods (11) are installed on both sides of the first support (4). Side baffles (12) are installed at the bottom of the second connecting rods (11).

7. The arsenic removal treatment device for high-arsenic coal according to claim 1, characterized in that, Above the conveyor belt (1), several coal turning mechanisms (2) are provided along the length direction, and the distribution components of adjacent coal turning mechanisms (2) are arranged staggeredly.

8. The arsenic removal treatment device for high-arsenic coal according to claim 1, characterized in that, A first induced draft fan (19) is installed on the air inlet pipe (18) at the front end of the housing (7) to introduce hot air into the interior of the housing (7); several exhaust pipes (20) are connected to the top of the middle section of the housing (7), the outlets of the multiple exhaust pipes (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).

9. The arsenic removal treatment device for high-arsenic coal according to 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 discharging end of the first conveyor belt (24) is located above the second conveyor belt (25).

10. The arsenic removal treatment device for high-arsenic coal according to claim 1, characterized in that, A quicklime incorporation system (26) is provided at the end of the conveyor belt (1), and the quicklime incorporation system (26) includes a storage tank (27) for storing quicklime, a third conveyor belt (28) and a hopper (29). The feeding end of the third conveyor belt (28) is located below the discharging port of the storage tank (27), the discharging end of the third conveyor belt (28) is located above the feeding port of the hopper (29), and the discharging port of the hopper (29) is located above the conveyor belt (1).

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