Fan coal mill pulverizing system capable of improving deep adjustment capacity

Abstract

The invention relates to the technical field of coal mills, in particular to a fan coal mill pulverizing system capable of improving depth adjusting capacity, which comprises a base, a mounting seat and a mounting frame fixedly connected to the upper end of the base, a shell fixedly connected to the upper end of the mounting seat, a pulverizing mechanism and a deslagging mechanism arranged in the shell, and a depth adjusting mechanism arranged at the upper end of the shell, the deslagging mechanism comprises an air inlet formed in the rear end face of the machine shell, an air inlet frame is fixedly connected into the air inlet, a jet head is fixedly connected into the air inlet frame, a deslagging opening is formed in the front end face of the machine shell, a rotating seat is fixedly connected to the front end of the machine shell, a rotating shaft is rotationally connected into the rotating seat, and a sealing blocking plate is fixedly connected to the circumferential face of the rotating shaft. By controlling the opening and closing time of the slag discharge port, the opening time of the slag discharge port is before the pulse gas, and the slag discharge port is basically synchronously opened and closed with the pulse gas, so that a large amount of coal and slag are prevented from being discharged together when equipment runs to discharge slag, and the slag discharge accuracy of the coal mill is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mills, and more particularly to a fan coal mill pulverizing system with improved deep adjustment capability. Background Art

[0002] The fan coal mill is a high-efficiency coal mill that can simultaneously complete the three functions of drying, grinding and powder conveying. It is widely used in large-scale lignite "Π-type" and "tower-type" boiler thermal power generating units of 600MW and above. The fan mill has reliable pulverizing performance and high efficiency. Even if low calorific value lignite is used as fuel, the boiler steam parameters and boiler efficiency can meet the operating requirements. It has outstanding energy-saving and environmental protection characteristics. At the same time, in order to meet the digital control needs of power plants, the control of the coal mill adopts an optical fiber bus integrated system to achieve integrated control.

[0003] The shortcomings of the existing technology: the existing fan coal mill is not equipped with a slag discharge device, and the ungrindable slag is accumulated at the bottom of the casing under the action of gravity. When the material level at the bottom of the casing is too high and exceeds the lower edge of the striking wheel, the slag can easily cause the outer circle of the striking wheel to wear rapidly, greatly increasing the wear and tear of the striking wheel and other components. Moreover, the slag cannot be discharged online and can only be cleaned when the machine is shut down. These problems seriously interfere with the adjustment of the boiler load and limit the continuous and stable operation of the pulverizing equipment. For this reason, we propose a fan coal mill pulverizing system with improved deep adjustment capability. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a fan coal mill pulverizing system with improved deep adjustment capability to solve the problems existing in the above-mentioned background technology.

[0005] The invention provides the following technical scheme: a fan coal mill pulverizing system with improved depth adjustment capability, comprising a machine base, the upper end of the machine base is fixedly connected with a mounting seat and a mounting frame, the upper end of the mounting seat is fixedly connected with a casing, the inner wall of the casing is fixedly connected with a guard plate, the front end of the casing is fixedly connected with a feed port, a grinding mechanism and a slag discharge mechanism are arranged in the casing, a depth adjustment mechanism is arranged at the upper end of the casing, the slag discharge mechanism comprises an air inlet opened at the rear end surface of the casing, an air inlet frame is fixedly connected in the air inlet, a slide groove is provided in the air inlet frame and a sealing block is slidably connected in the slide groove, an air jet head is fixedly connected in the air inlet frame, a slag discharge port is opened on the front end surface of the casing, a rotating seat is fixedly connected to the front end of the casing, a rotating shaft is rotatably connected in the rotating seat, a sealing block is fixedly connected to the circumferential surface of the rotating shaft, the sealing block is used to block the slag discharge port, and a driving mechanism is arranged at the upper end of the machine base, and the driving mechanism is used to control the opening and closing of the slag discharge port;

[0006] Preferably, a separator is fixedly connected to the upper end of the casing, and the separator is used to filter the coal powder.

[0007] Preferably, a pulse fan is fixedly connected to the upper end of the machine base, an output pipe is fixedly connected to the output end of the pulse fan, and one end of the output pipe away from the pulse fan is fixedly connected to the nozzle.

[0008] The cam is secured to the upper and lower ends of the cams and is secured to the lower ends of the cams and are secured to the second ends of the cams and are in a fixed position on the cam faces of the first and second guide wheels.

[0009] Preferably, the driving mechanism also includes a connecting shell fixedly connected to the circumferential surface of the output pipe, a driving shaft is rotatably connected in the connecting shell, a second gear is fixedly connected to the circumferential surface of the driving shaft, a second rack is fixedly connected to the rear end of the push rod, the second rack is meshed with the second gear, a support rod is fixedly connected to the upper end of the machine base, and a second tension spring is fixedly connected between the support rod and the second rack.

[0010] Preferably, the circumferential surface of the driving shaft is fixedly connected with a guide vane, and the guide vane is located in the output pipe.

[0011] Preferably, the grinding mechanism includes a connecting shaft rotatably connected in the casing, a striking wheel is fixedly connected to the circumferential surface of the connecting shaft, and the striking wheel is located in the casing.

[0012] Preferably, a driving motor is fixedly connected to the upper end of the mounting frame, and an output end of the driving motor is connected to the connecting shaft via an elastic coupling.

[0013] Preferably, the depth adjustment mechanism includes a plurality of diverter shells fixedly connected to the upper end of the casing, the upper ends of the diverter shells are respectively fixedly connected to the first powder outlet pipe, the second powder outlet pipe and the third powder outlet pipe, the diverter shells are fixedly connected to the first boosting pipe, the second boosting pipe and the third boosting pipe, the first boosting pipe, the second boosting pipe and the third boosting pipe correspond to the positions of the first powder outlet pipe, the second powder outlet pipe and the third powder outlet pipe, respectively.

[0014] Preferably, an air pump is fixedly connected to the upper end of the mounting frame, a connecting pipe is fixedly connected to the output end of the air pump, a shunt pipe is fixedly connected to the end of the connecting pipe away from the air pump, the connecting pipe is fixedly connected to the first boost pipe, the second boost pipe and the third boost pipe, and solenoid valves are provided in the first boost pipe, the second boost pipe and the third boost pipe.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The present invention controls the operation of the pulse fan to make the nozzle spray pulse gas, and at the same time controls the sealing block and the sealing plate to open under the action of the pulse gas, so that the pulse gas can be sprayed to the bottom of the casing through the air inlet frame, so that the slag deposited at the bottom is blown out through the slag discharge port. When the pulse gas ends, the sealing block and the sealing plate will be closed at the same time to seal the air inlet frame and the slag discharge port. Since the slag discharge port is opened before the pulse gas and is basically opened and closed synchronously with the pulse gas, a large amount of coal and slag are avoided from being discharged together when the equipment is running to discharge slag, thereby improving the accuracy of slag discharge.

[0017] 2. The present invention starts the air pump and then controls the solenoid valve on the third boost pipe to open. At this time, the air flow rate in the diverter shell at the corresponding position of the third boost pipe can be increased, so that a negative pressure suction state is formed in the third powder outlet pipe, so that most of the coal powder is discharged through the third powder outlet pipe. Since the diameter of the third powder outlet pipe is limited, the output coal powder is also limited, so the coal powder content therein is increased, and the powder output of other powder outlet pipes is reduced, thereby reducing the overall powder output. After being transported to the boiler, the combustion path of the coal powder can be increased, and the stability of the flame combustion in the boiler under low load and the degree of heat sufficiency can be effectively improved. The gas extracted by the air pump is the high-temperature furnace smoke generated by the combustion of the boiler. When the high-temperature furnace smoke contacts the coal powder, it can preheat and dry the coal powder, which is convenient for the subsequent combustion of the coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the rear view in the present invention.

[0020] Figure 3 It is a schematic diagram of a cross-section of the casing in the present invention.

[0021] Figure 4 It is a schematic diagram of the peak regulation mechanism in the present invention.

[0022] Figure 5 It is a schematic diagram of the slag discharge mechanism in the present invention.

[0023] Figure 6It is a schematic diagram of the cross-section of the output pipe and the connecting shell in the present invention.

[0024] Figure 7 For the present invention Figure 6 Schematic diagram of the structure of part A.

[0025] Figure 8 It is a schematic diagram of the disassembly of the jet head in the present invention.

[0026] Fig. 9 It is a schematic diagram of the slag discharge port when it is opened in the present invention.

[0027] The accompanying drawings are marked as follows: 1. base; 101. mounting base; 102. mounting frame; 2. casing; 201. guard plate; 202. separator; 203. feed port; 3. grinding mechanism; 301. connecting shaft; 302. striking wheel; 303. driving motor; 4. deep adjustment mechanism; 401. splitter shell; 402. first powder outlet pipe; 403. second powder outlet pipe; 404. third powder outlet pipe; 405. first boosting pipe; 406. second boosting pipe; 407. third boosting pipe; 408. air pump; 409. connecting pipe; 4010. splitter pipe; 4011. solenoid valve; 5. slag discharge mechanism; 501. air inlet; 502. air inlet frame; 503. slideway; 504. sealing block; 505. nozzle ;506, slag discharge port;507, rotating seat;508, rotating shaft;509, sealing plug;5010, pulse fan;5011, output pipe;6, driving mechanism;601, first slide seat;602, push rod;603, first cone block;604, connecting rod;605, second cone block;606, second slide seat;607, connecting frame;608, first inclined block;609, spring;6010, guide seat;6011, first rack;6012, second inclined block;6013, first gear;6014, first tension spring;7, connecting shell;701, driving shaft;702, guide vane;703, second gear;704, second rack;705, support rod;706, second tension spring. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are only examples. The fan coal mill pulverizing system with improved deep adjustment capability involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0029] like Figure 1-5As shown, in one embodiment, a fan coal mill pulverizing system with improved depth adjustment capability is proposed, comprising a base 1, a mounting base 101 and a mounting frame 102 are fixedly connected to the upper end of the base 1, a casing 2 is fixedly connected to the upper end of the mounting base 101, a guard plate 201 is fixedly connected to the inner wall of the casing 2, a feed port 203 is fixedly connected to the front end of the casing 2, a grinding mechanism 3 and a slag discharge mechanism 5 are arranged in the casing 2, a depth adjustment mechanism 4 is arranged at the upper end of the casing 2, the slag discharge mechanism 5 includes an air inlet 501 opened at the rear end surface of the casing 2, and an air inlet frame 503 is fixedly connected to the air inlet 501. 2. A slide groove 503 is provided on the surface of the air intake frame 502 and the casing 2. A sealing block 504 is slidably connected in the slide groove 503. A nozzle 505 is fixedly connected in the air intake frame 502. A slag discharge port 506 is provided on the front end surface of the casing 2. A rotating seat 507 is fixedly connected to the front end of the casing 2. A rotating shaft 508 is rotatably connected in the rotating seat 507. A sealing block 509 is fixedly connected to the circumferential surface of the rotating shaft 508. The sealing block 509 is used for blocking the slag discharge port 506. A driving mechanism 6 is provided at the upper end of the machine base 1. The driving mechanism 6 is used for controlling the opening and closing of the slag discharge port 506.

[0030] In actual application of the embodiment of the present invention, the raw coal is transported into the casing 2 through the action of the feed port 203, and then the grinding mechanism 3 is operated to grind the raw coal into powder. Then, the airflow drives the coal powder to be transported upward, and then the coal powder is filtered by the separator 202. The filtered coal powder enters the diversion shell 401, and then is transported to the boiler through the first powder outlet pipe 402, the second powder outlet pipe 403 and the third powder outlet pipe 404 for combustion. When some slag cannot be ground into coal powder, most of it will fall to the bottom of the casing 2. At this time, the pulse fan 501 is controlled to 0 operation, so that the nozzle 505 sprays out pulse gas, and at the same time controls the sealing block 504 and the sealing plug plate 509 to open, so that the pulse gas can be sprayed to the bottom of the casing 2 through the air inlet frame 502, so that the slag deposited at the bottom is blown out through the slag discharge port 506. When the pulse gas ends, the sealing block 504 and the sealing plug plate 509 will be closed at the same time to seal the air inlet frame 502 and the slag discharge port 506. Since the slag discharge port 506 is opened before the pulse gas and is basically opened and closed synchronously with the pulse gas, it is avoided that a large amount of coal is discharged together with the slag when the equipment is running to discharge slag, thereby improving the accuracy of slag discharge.

[0031] like Figure 3 As shown, as a preferred embodiment of the present invention, a separator 202 is fixedly connected to the upper end of the casing 2, and the separator 202 is used to filter the coal powder.

[0032] When the embodiment of the present invention is actually applied, the crushed coal powder can be filtered through the separator 202, so that the coal powder transported upward by air can reach a qualified volume.

[0033] like Figure 5 As shown, as a preferred embodiment of the present invention, a pulse fan 5010 is fixedly connected to the upper end of the machine base 1, an output pipe 5011 is fixedly connected to the output end of the pulse fan 5010, and the end of the output pipe 5011 away from the pulse fan 5010 is fixedly connected to the nozzle 505.

[0034] When the embodiment of the present invention is actually applied, by controlling the operation of the pulse fan 5010, the pulse fan 5010 will transport the pulse gas to the nozzle 505 through the output pipe 5011. When the sealing block 504 and the sealing plate 509 are opened, the pulse gas can impact the bottom of the casing 2 to discharge the slag accumulated at the bottom of the casing 2.

[0035] like Figure 5-9 As shown, as another preferred embodiment of the present invention, the driving mechanism 6 includes a first slide 601 fixedly connected to the upper end of the machine base 1, a push rod 602 is slidably connected in the first slide 601, a first cone block 603 is fixedly connected to the front end of the push rod 602, a connecting rod 604 is fixedly connected to the front end of the first cone block 603, a second cone block 605 is fixedly connected to the front end of the connecting rod 604, a second slide 606 is fixedly connected to the upper end of the mounting seat 101, the connecting rod 604 and the second slide 606 are slidably connected, a connecting frame 607 is fixedly connected to the lower end of the sealing block 504, and the lower end of the connecting frame 607 is fixedly connected to the first inclined block 60 8. The first inclined block 608 is slidably connected to the first cone block 603, a spring 609 is fixedly connected between the housing 2 and the sealing block 504, a guide seat 6010 is fixedly connected to the front end of the housing 2, a first rack 6011 is slidably connected in the guide seat 6010, a second inclined block 6012 is fixedly connected to the lower end of the first rack 6011, the second inclined block 6012 is slidably connected to the second cone block 605, a first gear 6013 is fixedly connected to the circumferential surface of the rotating shaft 508, the first gear 6013 is meshed with the first rack 6011, and a first tension spring 6014 is fixedly connected between the second inclined block 6012 and the mounting seat 101.

[0036] In actual application of the embodiment of the present invention, when the push rod 602 is pushed forward, the push rod 602 will drive the first cone block 603 to move forward. Under the action of the connecting rod 604, the first cone block 603 will synchronously drive the second cone block 605 to move forward. When the first cone block 603 and the second cone block 605 move forward at the same time, the first inclined block 608 and the second inclined block 6012 will be pushed upward to move upward. The first inclined block 608 drives the sealing block 504 to slide upward through the connecting frame 607, so that the air intake frame 502 is opened, and the second inclined block 6012 drives the first rack 6011 to slide upward, and the first rack 6011 drives the first rack 6012 to slide upward. The gear 6013 rotates, and the first gear 6013 drives the rotating shaft 508 to rotate. The rotating shaft 508 will drive the sealing plug 509 to open, thereby achieving the effect of opening the slag discharge port 506 for slag discharge. At the same time, when the push rod 602 is reset backward, the first cone block 603 and the second cone block 605 move backward and reset at the same time. At this time, under the action of the spring 609 and the first tension spring 6014, the sealing block 504 and the first rack 6011 will be reset to the lowered position. Subsequently, under the action of the first rack 6011, the sealing plug 509 will be driven to rotate and reset, thereby achieving the effect of re-blocking the air intake frame 502 and the slag discharge port 506.

[0037] In one case of an embodiment of the present invention, when slag discharge is being carried out, the slag discharged from the slag discharge port 506 is collected by an external collecting device to prevent the slag from splashing to the outside. At the same time, after the slag discharge is completed, after the slag discharge port 506 is blocked by the sealing plug 509, the sealing plug 509 can be fixed by an external device to improve the stability of the sealing plug 509. At the same time, when slag discharge is required, the sealing plug 509 needs to be released first.

[0038] like Figure 8 As shown, as another preferred embodiment of the present invention, the driving mechanism 6 also includes a connecting shell 7 fixedly connected to the circumferential surface of the output tube 5011, a driving shaft 701 is rotatably connected in the connecting shell 7, a second gear 703 is fixedly connected to the circumferential surface of the driving shaft 701, a second rack 704 is fixedly connected to the rear end of the push rod 602, the second rack 704 is meshed with the second gear 703, a support rod 705 is fixedly connected to the upper end of the base 1, and a second tension spring 706 is fixedly connected between the support rod 705 and the second rack 704.

[0039] When the embodiment of the present invention is actually applied, the driving shaft 701 can be controlled to rotate under the action of the pulse airflow and the guide blade 702. After the driving shaft 701 rotates, it will drive the second gear 703 to rotate, and the second gear 703 will drive the second rack 704 to move forward, and the second rack 704 will push the push rod 602 forward. When the pulse gas ends, the second rack 704 will be quickly reset by the action of the second tension spring 706, and then the pull rod will be driven to move backward to complete the reset. The opening and closing timing of the slag discharge port 506 is controlled to start and end with the pulse gas impact in the casing 2. The timing is almost synchronized, which avoids the discharge of a large amount of coal and slag when the equipment is running to discharge slag, thereby improving the accuracy of slag discharge.

[0040] like Figure 8 As shown, as another preferred embodiment of the present invention, the circumferential surface of the driving shaft 701 is fixedly connected with a guide vane 702 , and the guide vane 702 is located in the output pipe 5011 .

[0041] In actual application of the embodiment of the present invention, when the pulse gas is transported in the output pipe 5011, the guide vane 702 will drive the drive shaft 701 to rotate under the action of the pulse gas, thereby achieving the effect of controlling the operation of the drive mechanism 6.

[0042] like Figure 2 and 3 As shown, as another preferred embodiment of the present invention, the grinding mechanism 3 includes a connecting shaft 301 rotatably connected in the casing 2, and a striking wheel 302 is fixedly connected to the circumferential surface of the connecting shaft 301, and the striking wheel 302 is located in the casing 2.

[0043] In actual application, by controlling the rotation of the connecting shaft 301, the connecting shaft 301 will drive the impact wheel 302 to rotate. After the raw coal contacts the high-speed rotating impact wheel 302 and collides with it, the raw coal can be crushed.

[0044] like Figure 2 As shown, as another preferred embodiment of the present invention, a driving motor 303 is fixedly connected to the upper end of the mounting frame 102, and the output end of the driving motor 303 is connected to the connecting shaft 301 through an elastic coupling.

[0045] In actual application, the embodiment of the present invention controls the driving motor 303 to operate, and the driving motor 303 drives the connecting shaft 301 to rotate, thereby achieving the effect of driving the grinding mechanism 3 to operate.

[0046] like Figure 3As shown, as another preferred embodiment of the present invention, the deep adjustment mechanism 4 includes a plurality of diverter shells 401 fixedly connected to the upper end of the casing 2, the upper ends of the diverter shells 401 are respectively fixedly connected to the first powder outlet pipe 402, the second powder outlet pipe 403 and the third powder outlet pipe 404, the diverter shells 401 are fixedly connected to the first boosting pipe 405, the second boosting pipe 406 and the third boosting pipe 407, the first boosting pipe 405, the second boosting pipe 406 and the third boosting pipe 407 correspond to the positions of the first powder outlet pipe 402, the second powder outlet pipe 403 and the third powder outlet pipe 404, respectively.

[0047] In actual application of the embodiment of the present invention, when the boiler is running at a low load and the amount of pulverized coal entering the boiler is reduced, the electromagnetic valve 4011 on the third boost pipe 407 can be controlled to open. At this time, the air flow rate in the diverter shell 401 at the corresponding position of the third boost pipe 407 can be increased, so that a negative pressure suction state is formed in the third powder outlet pipe 404, so that most of the pulverized coal is discharged through the third powder outlet pipe 404. Since the diameter of the third powder outlet pipe 404 is limited, the output pulverized coal is also limited, thereby increasing the pulverized coal content therein and reducing the powder output of other powder outlet pipes, thereby The overall powder output is reduced. After being transported to the boiler, the combustion path of the coal powder can be increased, effectively improving the stability of flame combustion and the degree of heat sufficiency in the boiler under low load. When the boiler needs to operate at high load, the solenoid valves 4011 on the second boost pipe 406 and the third boost pipe 407 are all opened, so that the air flow rate in the first powder outlet pipe 402, the second powder outlet pipe 403 and the third powder outlet pipe 404 is increased, and the attraction for coal powder is increased through negative pressure, thereby increasing the powder output of the first powder outlet pipe 402, the second powder outlet pipe 403 and the third powder outlet pipe 404.

[0048] like Figure 4 As shown, as another preferred embodiment of the present invention, an air pump 408 is fixedly connected to the upper end of the mounting frame 102, a connecting pipe 409 is fixedly connected to the output end of the air pump 408, a shunt pipe 4010 is fixedly connected to the end of the connecting pipe 409 away from the air pump 408, the connecting pipe 409 is fixedly connected to the first boost pipe 405, the second boost pipe 406 and the third boost pipe 407, and the first boost pipe 405, the second boost pipe 406 and the third boost pipe 407 are all provided with solenoid valves 4011.

[0049] When the embodiment of the present invention is actually applied, by controlling the operation of the air pump 408, the air pump 408 will transport the gas to the first boost pipe 405, the second boost pipe 406 and the third boost pipe 407 through the connecting pipe 409 and the diversion pipe 4010. At the same time, the powder output of each powder output pipe can be controlled by controlling the opening and closing degree of the solenoid valve 4011. The gas extracted by the air pump 408 is the high-temperature furnace smoke generated by the combustion of the boiler. When the high-temperature furnace smoke contacts the coal powder, it can preheat and dry the coal powder, which is convenient for the subsequent combustion of the coal powder.

[0050] The working principle of the coal mill of the present invention is as follows: the raw coal with a particle size of less than 50 mm after being crushed by a crusher is transported to a drying tube through a coal feeder for pre-drying (the medium in the drying tube is a mixture of high-temperature furnace smoke in the boiler furnace and air heated by an air preheater, with an initial temperature of about 700-800°C and an oxygen content of no more than 11%). After passing through the 15-meter-long drying tube, preheating drying and self-peeling are achieved, the surface moisture of the raw coal is rapidly reduced, and the drying medium is cooled down at the same time, and then it enters the feed port of the coal mill. The coal is distributed along the inner diameter of the striking wheel and enters the casing. The coal is crushed under the impact and friction of the striking wheel, and most of the moisture in the coal is evaporated at the same time, completing sufficient drying. The conveying gas and coal powder move in the volute area of ​​the casing, and finally enter the separator at the mill outlet; some large-particle coal powder returns to the coal mill through the internal powder return pipe (the powder return pipe is shown in the figure, and the powder return pipe is the existing technology) for re-grinding, and the qualified coal powder is sent to the boiler burner for combustion through the powder conveying pipeline. The striking wheel plays the role of crushing coal and ventilation at the same time. The ventilation volume of the fan coal mill system includes: high-temperature furnace smoke (low oxygen content) extracted from the boiler combustion chamber; hot air from the air preheater; water vapor evaporated from the raw coal and leakage air (control leakage to reduce oxygen content), and blow sealing air into the side wall of the bearing. This wind prevents dust in the machine from leaking from the gap between the main shaft and the casing and protects the bearing box. The large fan coal mill crushes the raw coal through the high-speed rotating impact wheel. The impact wheel generates air volume through the blast effect generated by the high-speed rotation in the casing with a spiral inner wall to transport the ground coal powder to the boiler burner, and can ensure that a sufficiently high lifting pressure head is generated to overcome the coal mill inlet resistance and powder conveying resistance of the pulverizing system. The impact wheel of the large fan coal mill is cantilevered and installed on the connecting shaft, and the driving motor transmits power to the impact wheel through an elastic coupling;

[0051] The powder return pipe adjustment device installed at the lower section of the separator can adjust the ventilation volume of the powder outlet pipe of the mill. The adjustment capacity can reach 0% to 30% of the rated outlet air volume, effectively adjusting the air-coal ratio of the separator powder outlet to meet the variable load requirements of the boiler;

[0052] Large fan coal mill can increase the total pressure head up to 1900Pa, which is even higher at low load, meeting the boiler powder feeding requirements. When the fan mill speed remains unchanged, the internal circulation of the mill is reduced;

[0053] Control the oxygen content, increase the air temperature at the mill outlet, and improve the drying effect. It has very good adaptability to lignite with a raw coal moisture content of up to 30% to 50%;

[0054] The coal mill is equipped with an external lubricating oil station, which not only lubricates the bearings and the sliding connecting shafts of the drive motor, but also cools the bearing box and the sliding connecting shafts of the drive motor, ensuring that the temperature of the bearings in the bearing box and the motor bearings does not exceed 70°C, ensuring safe operation.

[0055] A coal powder fineness adjustment device is installed inside the separator, which has a large adjustment range for the coal powder fineness at the separator outlet, and the adjustment range is about 5% to 10%.

[0056] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0057] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0058] Finally: 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 in the protection scope of the present invention.

Claims

1. A fan coal pulverizing system with improved deep adjustment capability, comprising a machine base (1), characterized in that: The upper end of the machine base (1) is fixedly connected to a mounting seat (101) and a mounting frame (102); the upper end of the mounting seat (101) is fixedly connected to a housing (2); the inner wall of the housing (2) is fixedly connected to a guard plate (201); the front end of the housing (2) is fixedly connected to a feed port (203); a grinding mechanism (3) and a slag discharge mechanism (5) are provided in the housing (2); a depth adjustment mechanism (4) is provided at the upper end of the housing (2); the slag discharge mechanism (5) comprises an air inlet (501) opened at the rear end surface of the housing (2); an air inlet frame (502) is fixedly connected to the air inlet (501); and the air inlet frame (502) and the housing (2) are both provided with A slide groove (503) is provided, a sealing block (504) is slidably connected in the slide groove (503), a nozzle (505) is fixedly connected in the air intake frame (502), a slag discharge port (506) is provided on the front end face of the casing (2), a rotating seat (507) is fixedly connected to the front end of the casing (2), a rotating shaft (508) is rotatably connected in the rotating seat (507), a sealing block (509) is fixedly connected to the circumferential surface of the rotating shaft (508), and the sealing block (509) is used to block the slag discharge port (506). A driving mechanism (6) is provided at the upper end of the machine base (1), and the driving mechanism (6) is used to control the opening and closing of the slag discharge port (506).

2. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 1, characterized in that: A separator (202) is fixedly connected to the upper end of the casing (2), and the separator (202) is used to filter coal powder.

3. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 1, characterized in that: The upper end of the machine base (1) is fixedly connected to a pulse fan (5010), the output end of the pulse fan (5010) is fixedly connected to an output pipe (5011), and the end of the output pipe (5011) away from the pulse fan (5010) is fixedly connected to the nozzle (505).

4. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 1, characterized in that: The driving mechanism (6) comprises a first slide seat (601) fixedly connected to the upper end of the machine base (1), a push rod (602) slidably connected inside the first slide seat (601), a first cone block (603) fixedly connected to the front end of the push rod (602), a connecting rod (604) fixedly connected to the front end of the first cone block (603), a second cone block (605) fixedly connected to the front end of the connecting rod (604), a second slide seat (606) fixedly connected to the upper end of the mounting seat (101), the connecting rod (604) and the second slide seat (606) are slidably connected, a connecting frame (607) fixedly connected to the lower end of the sealing block (504), a first inclined block (608) fixedly connected to the lower end of the connecting frame (607), and the first inclined block ( 608) is slidably connected to the first cone block (603), a spring (609) is fixedly connected between the housing (2) and the sealing block (504), a guide seat (6010) is fixedly connected to the front end of the housing (2), a first rack (6011) is slidably connected inside the guide seat (6010), a second inclined block (6012) is fixedly connected to the lower end of the first rack (6011), the second inclined block (6012) is slidably connected to the second cone block (605), a first gear (6013) is fixedly connected to the circumferential surface of the rotating shaft (508), the first gear (6013) is meshed with the first rack (6011), and a first tension spring (6014) is fixedly connected between the second inclined block (6012) and the mounting seat (101).

5. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 4, characterized in that: The driving mechanism (6) further comprises a connecting shell (7) fixedly connected to the circumferential surface of the output tube (5011), a driving shaft (701) being rotatably connected inside the connecting shell (7), a second gear (703) being fixedly connected to the circumferential surface of the driving shaft (701), a second rack (704) being fixedly connected to the rear end of the push rod (602), the second rack (704) being meshed with the second gear (703), a support rod (705) being fixedly connected to the upper end of the machine base (1), and a second tension spring (706) being fixedly connected between the support rod (705) and the second rack (704).

6. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 5, characterized in that: A guide vane (702) is fixedly connected to the circumferential surface of the driving shaft (701), and the guide vane (702) is located in the output pipe (5011).

7. The fan coal mill pulverizing system with improved deep adjustment capability according to claim 1, characterized in that: The grinding mechanism (3) comprises a connecting shaft (301) rotatably connected in the housing (2), a striking wheel (302) being fixedly connected to the circumferential surface of the connecting shaft (301), and the striking wheel (302) is located in the housing (2).

8. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 7, characterized in that: A driving motor (303) is fixedly connected to the upper end of the mounting frame (102), and an output end of the driving motor (303) is connected to the connecting shaft (301) via an elastic coupling.

9. The fan coal mill pulverizing system with improved deep adjustment capability according to claim 1, characterized in that: The depth adjustment mechanism (4) comprises a plurality of flow dividing shells (401) fixedly connected to the upper end of the casing (2); the upper ends of the flow dividing shells (401) are respectively fixedly connected to a first powder outlet pipe (402), a second powder outlet pipe (403) and a third powder outlet pipe (404); the flow dividing shells (401) are fixedly connected to a first boosting pipe (405), a second boosting pipe (406) and a third boosting pipe (407); the first boosting pipe (405), the second boosting pipe (406) and the third boosting pipe (407) respectively correspond to the positions of the first powder outlet pipe (402), the second powder outlet pipe (403) and the third powder outlet pipe (404).

10. A fan coal mill pulverizing system with improved deep adjustment capability according to claim 9, characterized in that: The upper end of the mounting frame (102) is fixedly connected to an air pump (408), the output end of the air pump (408) is fixedly connected to a connecting pipe (409), one end of the connecting pipe (409) away from the air pump (408) is fixedly connected to a shunt pipe (4010), the connecting pipe (409) is fixedly connected to the first boosting pipe (405), the second boosting pipe (406) and the third boosting pipe (407), and the first boosting pipe (405), the second boosting pipe (406) and the third boosting pipe (407) are all provided with solenoid valves (4011).

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