A device and method for synchronously improving the air temperature and water temperature of a boiler coal mill

Abstract

The present application relates to coal-fired boiler body equipment technical field, specifically said is a kind of device and method for synchronously improving boiler coal mill air temperature and water temperature, including base, first heating structure, second heating structure, adjusting structure, crushing structure, overhaul structure, coal mill body, blanking pipe, powder pipe, fixed pipe and conveying pipe;The setting of first heating structure and second heating structure can synchronously improve the primary air temperature of coal mill body outlet and the feedwater temperature of boiler body, create more optimal conditions for pulverized coal combustion, make pulverized coal combustion more fully, thereby improve the combustion efficiency of boiler body, while increasing the feedwater temperature can reduce the amount of fuel required to heat feedwater to steam, the setting of crushing structure facilitates the preliminary crushing of materials entering the coal mill body, avoid material block size too large to increase energy consumption and wear, affect the normal operation and service life of coal mill body, the setting of overhaul structure improves the internal overhaul efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of coal-fired boiler body equipment, specifically to a device and method for simultaneously increasing the air temperature and water temperature of the boiler coal mill. Background Technology

[0002] In the operation of coal-fired boilers, the primary air temperature at the coal mill outlet and the feedwater temperature are key factors affecting their performance. The main function of the primary air at the coal mill outlet is to dry and transport pulverized coal. Its temperature must be within a suitable range. Too high or too low a temperature will affect the degree of drying and transport of pulverized coal, thereby affecting combustion efficiency. At the same time, the feedwater temperature is directly related to the boiler's thermal efficiency. Increasing the feedwater temperature can reduce fuel consumption because the feedwater needs to absorb a large amount of heat during the process of being heated into steam. Increasing the feedwater temperature can reduce the amount of fuel required for this process and improve steam generation efficiency.

[0003] However, when it is necessary to adjust the primary air temperature and feedwater temperature, only the primary air temperature or feedwater temperature at the coal mill outlet can be adjusted individually, making it difficult to achieve simultaneous and efficient increases in both. Moreover, during the adjustment process, there is a problem of insufficient energy utilization; some energy is not effectively utilized during the temperature increase, resulting in energy waste. At the same time, if the material entering the coal mill is too large, it will increase the energy consumption and wear of the coal mill, affecting its normal operation and service life. Furthermore, the coal mill maintenance plate is usually tightly installed on the coal mill with multiple bolts. When it is necessary to inspect the inside of the coal mill, maintenance personnel need to spend a lot of time disassembling numerous bolts one by one, and then reinstalling and tightening them one by one after the inspection is completed. The operation is cumbersome, time-consuming, and labor-intensive, affecting maintenance efficiency. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a device and method for simultaneously increasing the air temperature and water temperature of a boiler coal mill.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a device and method for simultaneously increasing the air temperature and water temperature of a boiler coal mill, comprising a base, two coal mill bodies installed on the base, a first heating structure installed between the base and the coal mill bodies, a second heating structure installed between the base and the first heating structure, an adjustment structure installed on the base, a crushing structure installed on the adjustment structure, a maintenance structure provided on the coal mill bodies, four powder pipes installed on the coal mill bodies, a fixed pipe installed on the eight powder pipes, a conveying pipe fixedly connected to the fixed pipe, and a discharge pipe installed on the coal mill bodies;

[0006] The first heating structure includes a boiler body mounted on the base and a first pipe mounted on the boiler body. The conveying pipe is connected to the burner interface of the boiler body. A sleeve heat exchanger is mounted on the pulverized coal pipe. A spiral blade is fixedly connected between the pulverized coal pipe and the sleeve heat exchanger. A sixth pipe is installed at both the inlet and outlet of the sleeve heat exchanger. A regulating valve is installed between every four sixth pipes. A fifth pipe is installed on the regulating valve. A first isolation valve is installed on the fifth pipe. A fourth pipe is installed between two first isolation valves. A third pipe is fixedly connected to the upper fourth pipe. A pressure reducing valve is installed on the third pipe. A second pipe is installed between the pressure reducing valve and the first pipe.

[0007] The second heating structure includes a steam turbine mounted on the base and an eighth pipe mounted on the steam turbine. The other end of the first pipe is mounted on the steam turbine. A high-pressure heater is mounted on the base. A second isolation valve is mounted on the eighth pipe. A ninth pipe is installed between the second isolation valve and the high-pressure heater. A seventh pipe is fixedly connected between the high-pressure heater and the fourth pipe below. A tenth pipe is installed between the high-pressure heater and the water pump inlet of the boiler body.

[0008] Specifically, the adjustment structure includes a guide frame mounted on the base and an adjustment plate slidably connected to the guide frame. A first lead screw is rotatably connected inside the guide frame, and the adjustment plate is threadedly connected to the first lead screw.

[0009] Specifically, a guide rod is fixedly connected inside the guide frame, the adjusting plate is slidably connected to the guide rod, an adjusting shaft is rotatably connected to the adjusting plate, a second motor is installed at the bottom of the adjusting plate, the adjusting shaft is fixedly connected to the output shaft of the second motor, a first motor is installed on the guide frame, and the first lead screw is fixedly connected to the output shaft of the first motor.

[0010] Specifically, the crushing structure includes a feed box fixedly connected to the adjusting shaft and a connecting shaft rotatably connected to the feed box. A crushing roller is fixedly connected to the connecting shaft, and a gear is fixedly connected to the connecting shaft, with the two gears meshing with each other.

[0011] Specifically, a mounting base is fixedly connected to the feeding box, and a third motor is mounted on the mounting base, with one of the connecting shafts fixedly connected to the output shaft of the third motor.

[0012] Specifically, the bottom of the feeding box is fixedly connected to two connecting sleeves, and the two connecting sleeves are slidably connected to two feeding pipes respectively.

[0013] Specifically, the maintenance structure includes three maintenance doors detachably connected to the coal mill body and three mounting sleeves installed on the coal mill body. Mounting blocks are slidably connected inside the mounting sleeves, and the three mounting blocks are respectively engaged with the three maintenance doors. The cross-section of the mounting blocks is trapezoidal.

[0014] Specifically, a guide block is fixedly connected to the mounting block, a spring is fixedly connected between the guide block and the mounting sleeve, and a pull plate is fixedly connected to the mounting block.

[0015] Specifically, a connecting frame is slidably connected inside the inspection door, a sealing ring is fixedly connected to the connecting frame, the sealing ring abuts against the coal mill body, a sliding rod is fixedly connected to the connecting frame, a second lead screw is rotatably connected to the sliding rod, the second lead screw is threadedly connected to the inspection door, and a rotating rod is fixedly connected to the second lead screw.

[0016] A method for simultaneously increasing the air temperature and water temperature of a boiler coal mill includes the following steps:

[0017] S1: A portion of high-temperature steam is drawn from the steam system of the first heating structure and transported to the primary air to exchange heat with the primary air, thereby increasing the temperature of the primary air and drying the pulverized coal. When the feedwater flows through the second heating structure, its temperature is gradually increased through heat exchange with the high-temperature medium, so that the feedwater temperature rises steadily to the set target value, and the preheated feedwater enters the boiler body.

[0018] S2: Before entering the coal mill body, the material is initially crushed by the crushing structure, and then fed into the coal mill body after being turned into small pieces. At the same time, when it is necessary to maintain or replace the crushing components in the crushing structure, the height of the crushing structure can be adjusted by adjusting the structure.

[0019] S3: During maintenance, the coal grinding components inside the coal mill body are replaced and repaired by using the maintenance structure.

[0020] The beneficial effects of this invention are:

[0021] (1) The device and method for simultaneously increasing the air temperature and water temperature of a coal mill in a boiler, as described in this invention, have a first heating structure between the base and the coal mill body, and a second heating structure between the base and the first heating structure. The arrangement of the first heating structure and the second heating structure can simultaneously increase the primary air temperature at the outlet of the coal mill body and the feedwater temperature of the boiler body, creating better conditions for pulverized coal combustion, making the pulverized coal combustion more complete, thereby improving the combustion efficiency of the boiler body. At the same time, increasing the feedwater temperature can reduce the amount of fuel required to heat the feedwater to steam. Meanwhile, the optimized primary air temperature helps to stabilize and improve the efficiency of the combustion process, reduce the additional fuel input, and achieve energy saving.

[0022] (2) The device and method for simultaneously increasing the air temperature and water temperature of a boiler coal mill as described in this invention have an adjustment structure on the base and a crushing structure on the adjustment structure. The crushing structure facilitates the preliminary crushing of the material entering the coal mill body, avoiding excessively large material pieces that increase the energy consumption and wear of the coal mill body and affect the normal operation and service life of the coal mill body. At the same time, the crushed material will slide down the feed pipe into the coal mill body. The adjustment structure facilitates the reduction of the height of the feed box, thereby reducing the difficulty of maintenance of the crushing components.

[0023] (3) The device and method for simultaneously increasing the air temperature and water temperature of a coal mill in a boiler, as described in this invention, have a maintenance structure on the coal mill body. The mounting block in the maintenance structure engages with the maintenance door, which facilitates quick disassembly and assembly of the maintenance door and the coal mill body, thereby improving the disassembly and assembly efficiency of the maintenance door and thus improving the internal maintenance efficiency. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of the device and method for simultaneously increasing the air temperature and water temperature of a boiler coal mill provided by the present invention;

[0026] Figure 2 for Figure 1 The diagram shown is an enlarged view of the structure of part A.

[0027] Figure 3 A schematic diagram of the connection structure between the steam turbine and the base of the present invention;

[0028] Figure 4 A schematic diagram of the connection structure between the coal mill body and the base of the present invention;

[0029] Figure 5 A schematic diagram of the connection structure between the connecting shaft and the feeding box of the present invention;

[0030] Figure 6 A schematic diagram of the connection structure between the adjusting plate and the guide frame of the present invention;

[0031] Figure 7 A schematic diagram of the structure of the crushing roller of the present invention;

[0032] Figure 8 A schematic diagram of the connection structure between the maintenance door and the coal mill body of the present invention;

[0033] Figure 9 A schematic diagram of the connection structure between the sliding rod and the access door of the present invention;

[0034] Figure 10 for Figure 9 The diagram shown is an enlarged view of the structure of section B.

[0035] Figure 11 A schematic diagram of the connection structure between the guide block and the mounting block of the present invention;

[0036] Figure 12 A schematic diagram of the connection structure between the sealing ring and the connecting frame of the present invention;

[0037] Figure 13 A schematic diagram of the connection structure between the sleeve heat exchanger and the powder tube of the present invention;

[0038] Figure 14 A schematic diagram of the structure of the spiral blade of the present invention.

[0039] In the diagram: 1. Base; 2. First heating structure; 201. Boiler body; 202. First pipe; 203. Second pipe; 204. Pressure reducing valve; 205. Third pipe; 206. Fourth pipe; 207. First isolation valve; 208. Fifth pipe; 209. Regulating valve; 210. Sixth pipe; 211. Sleeve heat exchanger; 212. Seventh pipe; 213. Spiral blade; 3. Second heating structure; 301. Steam turbine; 302. Eighth pipe; 303. Second isolation valve; 304. Ninth pipe; 305. High-pressure heater; 306. Tenth pipe; 4. Regulating structure; 401. Guide frame; 402. Regulating plate; 403. 404. Lead screw; 405. First motor; 406. Guide rod; 407. Adjusting shaft; 408. Second motor; 5. Crushing structure; 501. Feed box; 502. Connecting shaft; 503. Crushing roller; 504. Gear; 505. Mounting base; 506. Third motor; 507. Connecting sleeve; 6. Maintenance structure; 601. Maintenance door; 602. Mounting sleeve; 603. Mounting block; 604. Pull plate; 605. Guide block; 606. Spring; 607. Sealing ring; 608. Connecting frame; 609. Slide rod; 610. Second lead screw; 611. Rotating rod; 7. Coal mill body; 8. Feed pipe; 9. Powder pipe; 10. Fixed pipe; 11. Conveying pipe. Detailed Implementation

[0040] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8 , Figure 9 , Figure 10 , Figure 13 and Figure 14 As shown, the device and method for simultaneously increasing the air and water temperatures of a boiler coal mill according to the present invention includes a base 1, two coal mill bodies 7 mounted on the base 1, a first heating structure 2 mounted between the base 1 and the coal mill bodies 7, a second heating structure 3 mounted between the base 1 and the first heating structure 2, an adjustment structure 4 mounted on the base 1, a crushing structure 5 mounted on the adjustment structure 4, a maintenance structure 6 mounted on the coal mill bodies 7, four powder pipes 9 mounted on the coal mill bodies 7, and an installation... The first heating structure 2 includes a boiler body 201 mounted on the base 1 and a first pipe 202 mounted on the boiler body 201. The conveying pipe 11 is connected to the burner interface of the boiler body 201. A sleeve heat exchanger 211 is installed on the powder pipe 9. A spiral blade 213 is fixedly connected between the powder pipe 9 and the sleeve heat exchanger 211. The inlet and outlet of device 211 are each equipped with a sixth pipe 210. A regulating valve 209 is installed between every four sixth pipes 210. A fifth pipe 208 is installed on the regulating valve 209. A first isolation valve 207 is installed on the fifth pipe 208. A fourth pipe 206 is installed between two first isolation valves 207. A third pipe 205 is fixedly connected to the upper fourth pipe 206. A pressure reducing valve 204 is installed on the third pipe 205. A second pipe 202 is installed between the pressure reducing valve 204 and the first pipe 202. 3; The second heating structure 3 includes a steam turbine 301 mounted on the base 1 and an eighth pipe 302 mounted on the steam turbine 301. The other end of the first pipe 202 is mounted on the steam turbine 301. A high-pressure heater 305 is mounted on the base 1. A second isolation valve 303 is mounted on the eighth pipe 302. A ninth pipe 304 is installed between the second isolation valve 303 and the high-pressure heater 305. A seventh pipe 212 is fixedly connected between the high-pressure heater 305 and the fourth pipe 206 below it.

[0042] Specifically, such as Figure 3 and Figure 4As shown, a tenth pipe 306 is installed between the high-pressure heater 305 and the water pump inlet of the boiler body 201. First, the steam in the boiler body 201 enters the steam turbine 301 through the first pipe 202 to perform work. The bypass superheated steam enters the pressure reducing valve 204 through the second pipe 203 and is then reduced in pressure to become low-pressure bypass superheated steam. The low-pressure bypass superheated steam enters the third pipe 205, and then enters the two first isolation valves 207 through the fourth pipe 206 above, and then through the fifth pipe 20... The flow rate is regulated by the regulating valve 209 between pipe 8 and the sixth pipe 210, and then enters the sleeve heat exchanger 211. After entering the sleeve heat exchanger 211, the steam flows in a spiral motion along the vertical spiral blades 213. The steam exchanges heat with the primary air in the sleeve heat exchanger 211, transferring heat to the primary air in the pulverized coal pipe 9. The temperature of the heated primary air is increased, which dries the pulverized coal. The pulverized coal then enters the combustion stage of the boiler body 201 from the fixed pipe 10 and the conveying pipe 11, ensuring the drying of the pulverized coal and... The conveying effect is improved, and the combustion efficiency is enhanced. At the same time, the low-temperature steam enters the seventh pipe 212 from the fourth pipe 206 below, and then enters the high-pressure heater 305 from the seventh pipe 212. Then, the second isolation valve 303 between the eighth pipe 302 and the ninth pipe 304 is closed. At this time, the low-temperature steam heats the low-temperature feedwater through the high-pressure heater 305, ensuring that the feedwater temperature rises steadily to the set target value. The preheated feedwater enters the boiler body 201 through the tenth pipe 306. By preheating the feedwater, it can be quickly converted into steam with relatively less fuel heat absorption, which improves the steam generation efficiency. By simultaneously increasing the primary air temperature at the outlet of the coal mill body 7 and the feedwater temperature of the boiler body 201, better conditions are created for pulverized coal combustion, making the pulverized coal combustion more complete, thereby improving the combustion efficiency of the boiler body 201. At the same time, increasing the feedwater temperature can reduce the amount of fuel required to heat the feedwater to steam. In addition, the optimized primary air temperature helps to stabilize and improve the efficiency of the combustion process, reduce the additional fuel input, and achieve energy saving.

[0043] Specifically, such as Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the adjustment structure 4 includes a guide frame 401 mounted on the base 1 and an adjustment plate 402 slidably connected to the guide frame 401. A first lead screw 403 is rotatably connected inside the guide frame 401, and the adjustment plate 402 is threadedly connected to the first lead screw 403. A guide rod 405 is fixedly connected inside the guide frame 401, and the adjustment plate 402 is slidably connected to the guide rod 405. An adjustment shaft 406 is rotatably connected to the adjustment plate 402. A second motor 407 is mounted at the bottom of the adjustment plate 402, and the adjustment shaft 406 is fixedly connected to the output shaft of the second motor 407. A first motor 404 is mounted on the guide frame 401, and the first lead screw 403 is fixedly connected to the output shaft of the first motor 404. The crushing structure 5 includes a feed box 501 fixedly connected to the adjusting shaft 406 and a connecting shaft 502 rotatably connected to the feed box 501. A crushing roller 503 is fixedly connected to the connecting shaft 502, and gears 504 are fixedly connected to the connecting shaft 502, meshing between the two gears 504. A mounting base 505 is fixedly connected to the feed box 501, and a third motor 506 is mounted on the mounting base 505. One of the connecting shafts 502 is fixedly connected to the output shaft of the third motor 506. Two connecting sleeves 507 are fixedly connected to the bottom of the feed box 501, and the two connecting sleeves 507 are slidably connected to two feed pipes 8 respectively. When it is necessary to add material to the coal mill body 7, Material is conveyed to the feed box 501 by a conveying device. Simultaneously, the third motor 506 on the mounting base 505 is activated. The output shaft of the third motor 506 rotates, driving one of the connecting shafts 502. The connecting shaft 502 drives the gear 504, causing the two gears 504 to rotate relative to each other. This causes the two connecting shafts 502 to drive the two crushing rollers 503, which then perform preliminary crushing on the material entering the coal mill body 7. This prevents the material from entering the coal mill body 7 with excessively large pieces, which would increase energy consumption and wear, affecting the normal operation and service life of the coal mill body 7. The crushed material then slides down the feed pipe 8 into the coal mill body 7. When replacement or maintenance of the crushing components is required, it can be... When the first motor 404 is started, its output shaft rotates, driving the first lead screw 403 to rotate. The rotation of the lead screw 403 drives the adjusting plate 402 to slide within the guide frame 401. The adjusting plate 402 slides against the guide rod 405. The guide rod 405 ensures smoother sliding of the adjusting plate 402. First, the adjusting plate 402 moves the feeding box 501 upwards a certain distance, causing the feeding box 501 and connecting sleeve 507 to no longer be inserted into the feeding pipe 8. Then, the second motor 407 is started, and its output shaft rotates, driving the adjusting shaft 406 to rotate. The adjusting shaft 406 then rotates the feeding box 501 to one side, and the first lead screw 403 drives the adjusting plate 402 downwards.The adjusting plate 402 moves the feed box 501 downwards, making it easier to lower its height and thus reducing the difficulty of maintenance of the crushing components.

[0044] Specifically, such as Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the maintenance structure 6 includes three maintenance doors 601 detachably connected to the coal mill body 7 and three mounting sleeves 602 installed on the coal mill body 7. Mounting blocks 603 are slidably connected inside each mounting sleeve 602. The three mounting blocks 603 respectively engage with the three maintenance doors 601. The mounting blocks 603 have a trapezoidal cross-section. Guide blocks 605 are fixedly connected to each mounting block 603. Springs 606 are fixedly connected between the guide blocks 605 and the mounting sleeves 602. Pull plates 604 are fixedly connected to each mounting block 603. Connecting... A frame 608 is connected to a sealing ring 607, which abuts against the coal mill body 7. A slide rod 609 is fixedly connected to the frame 608, and a second lead screw 610 is rotatably connected to the slide rod 609. The second lead screw 610 is threadedly connected to the inspection door 601. A rotating rod 611 is fixedly connected to the second lead screw 610. When it is necessary to inspect the inside of the coal mill body 7, the pull plate 604 can be pulled upwards. When the pull plate 604 moves upwards, it drives the mounting block 603 to move. When the mounting block 603 moves, the guide block 605 slides within the mounting sleeve 602. When the spring 606 contracts, and the mounting block 603 is no longer engaged with the inspection door 601, the inspection door 601 can be removed from the coal mill body 7 by pulling the rotating rod 611 for internal component maintenance. During installation, simply slide the inspection door 601 between it and the coal mill body 7. Because the mounting block 603 has a trapezoidal cross-section, when the inspection door 601 contacts the inclined surface of the mounting block 603, the mounting block 603 will automatically slide upwards. When the mounting groove of the inspection door 601 aligns with the mounting block 603, the mounting block 603 will engage with the inspection door 601 under the action of the spring 606. The inspection door 601 engages, facilitating quick and easy disassembly and assembly between the inspection door 601 and the coal mill body 7, thus improving the efficiency of disassembly and assembly of the inspection door 601 and thereby improving the efficiency of internal maintenance. After installation, the second lead screw 610 can be rotated by the rotating rod 611. The second lead screw 610 and the inspection door 601 are threaded together, causing the slide rod 609 to slide. When the slide rod 609 slides, it causes the connecting frame 608 to move. The connecting frame 608 will cause the sealing ring 607 to abut against the coal mill body 7. The abutment between the sealing ring 607 and the coal mill body 7 improves the sealing performance between the inspection door 601 and the coal mill body 7.

[0045] A method for simultaneously increasing the air temperature and water temperature of a boiler coal mill includes the following steps:

[0046] S1: A portion of high-temperature steam is drawn from the steam system of the first heating structure 2 and transported to the primary air to exchange heat with the primary air, thereby increasing the temperature of the primary air and drying the pulverized coal. When the feedwater flows through the second heating structure 3, its temperature is gradually increased through heat exchange with the high-temperature medium, so that the feedwater temperature rises steadily to the set target value, and the preheated feedwater enters the boiler body 201.

[0047] S2: Before entering the coal mill body 7, the material is initially crushed by the crushing structure 5, and then fed into the coal mill body 7 after being turned into small pieces. At the same time, when it is necessary to maintain or replace the crushing components in the crushing structure 5, the height of the crushing structure 5 can be adjusted by the adjusting structure 4.

[0048] S3: During maintenance, the coal grinding components inside the coal mill body 7 are replaced and maintained by the maintenance structure 6.

[0049] In use, the steam in the boiler body 201 first enters the turbine 301 through the first pipe 202 for operation. The bypass superheated steam enters the pressure reducing valve 204 through the second pipe 203, becoming low-pressure bypass superheated steam. This low-pressure bypass superheated steam then enters the third pipe 205, and then from the upper fourth pipe 206 into the two first isolation valves 207. The flow rate is then regulated by the regulating valve 209 between the fifth pipe 208 and the sixth pipe 210. After entering the sleeve heat exchanger 211, the steam flows spirally along the vertical spiral blades 213. The steam exchanges heat with the primary air in the sleeve heat exchanger 211, transferring heat to the primary air in the pulverized coal pipe 9. The heated primary air temperature is increased, drying the pulverized coal. The pulverized coal then enters the combustion chamber of the boiler body 201 through the fixed pipe 10 and the conveying pipe 11, ensuring both pulverized coal drying and conveying efficiency, improving combustion efficiency, and simultaneously reducing low temperature. Steam enters the seventh pipe 212 from the fourth pipe 206 below, and then enters the high-pressure heater 305 from the seventh pipe 212. Then the second isolation valve 303 between the eighth pipe 302 and the ninth pipe 304 is closed. At this time, the low-temperature steam heats the low-temperature feedwater through the high-pressure heater 305, ensuring that the feedwater temperature rises steadily to the set target value. The preheated feedwater enters the boiler body 201 through the tenth pipe 306. By preheating the feedwater, it can be quickly converted into steam with relatively little fuel heat absorption, which improves the steam generation efficiency. By simultaneously increasing the primary air temperature at the outlet of the coal mill body 7 and the feedwater temperature of the boiler body 201, better conditions are created for pulverized coal combustion, making the pulverized coal combustion more complete, thereby improving the combustion efficiency of the boiler body 201. At the same time, increasing the feedwater temperature can reduce the amount of fuel required to heat the feedwater to steam. In addition, the optimized primary air temperature helps to stabilize and improve the efficiency of the combustion process, reduce the additional fuel input, and achieve energy saving.

[0050] When material needs to be added to the coal mill body 7, it can be conveyed to the feed box 501 via a conveying device. Simultaneously, the third motor 506 on the mounting base 505 is started. The output shaft of the third motor 506 rotates, driving one of the connecting shafts 502 to rotate. The connecting shaft 502 drives the gear 504 to rotate, and the two gears 504 rotate relative to each other. This causes the two connecting shafts 502 to drive the two crushing rollers 503 to rotate, allowing the crushing rollers 503 to initially crush the material entering the coal mill body 7. This prevents the material from entering the coal mill body 7 with excessively large pieces, which would increase the energy consumption and wear of the coal mill body 7, affecting its normal operation and service life. The crushed material then slides down the feed pipe 8 into the coal mill body 7. When the crushing components need to be replaced or maintained, the first motor 404 can be started. When the output shaft of 4 rotates, it drives the first lead screw 403 to rotate. When the first lead screw 403 rotates, the thread drives the adjusting plate 402 to slide in the guide frame 401. The adjusting plate 402 will slide with the guide rod 405. The setting of the guide rod 405 makes the sliding of the adjusting plate 402 more stable. First, the adjusting plate 402 drives the feeding box 501 to move upward a certain distance. After the feeding box 501 drives the connecting sleeve 507 to no longer be inserted with the feeding pipe 8, the second motor 407 is started. When the output shaft of the second motor 407 rotates, it drives the adjusting shaft 406 to rotate. The adjusting shaft 406 will drive the feeding box 501 to rotate to one side. Then, the first lead screw 403 drives the adjusting plate 402 to move downward. The adjusting plate 402 drives the feeding box 501 to move downward, which makes it easier to reduce the height of the feeding box 501, thereby reducing the difficulty of operation for maintenance of the crushing components.

[0051] When maintenance is required on the inside of the coal mill body 7, the pull plate 604 can be pulled upwards. As the pull plate 604 moves upwards, it drives the mounting block 603 to move. When the mounting block 603 moves, the guide block 605 slides within the mounting sleeve 602, and the spring 606 retracts. Once the mounting block 603 is no longer engaged with the inspection door 601, the inspection door 601 can be removed from the coal mill body 7 by pulling the rotating rod 611 for internal component maintenance. During installation, simply slide the inspection door 601 between it and the coal mill body 7. Because the mounting block 603 has a trapezoidal cross-section, when the inspection door 601 contacts the inclined surface of the mounting block 603, the mounting block 603 will automatically slide upwards. When the mounting groove of the inspection door 601 engages with the mounting block 603… When the mounting block 603 engages with the inspection door 601 under the action of the spring 606, the engagement of the mounting block 603 with the inspection door 601 facilitates quick disassembly and assembly between the inspection door 601 and the coal mill body 7, improving the efficiency of disassembly and assembly of the inspection door 601 and thus improving the efficiency of internal maintenance. After installation, the second lead screw 610 can be rotated by the rotating rod 611. The second lead screw 610 and the inspection door 601 are threaded together, causing the slide rod 609 to slide. When the slide rod 609 slides, it causes the connecting frame 608 to move. The connecting frame 608 will cause the sealing ring 607 to abut against the coal mill body 7. The abutment between the sealing ring 607 and the coal mill body 7 improves the sealing performance between the inspection door 601 and the coal mill body 7.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for simultaneously increasing the air temperature and water temperature of a boiler coal mill, characterized in that, Includes a base (1), two coal mill bodies (7) installed on the base (1), a first heating structure (2) installed between the base (1) and the coal mill body (7), a second heating structure (3) installed between the base (1) and the first heating structure (2), an adjustment structure (4) installed on the base (1), a crushing structure (5) installed on the adjustment structure (4), a maintenance structure (6) installed on the coal mill body (7), four powder pipes (9) installed on the coal mill body (7), a fixed pipe (10) installed on the eight powder pipes (9), a conveying pipe (11) fixedly connected to the fixed pipe (10), and a discharge pipe (8) installed on the coal mill body (7). The first heating structure (2) includes a boiler body (201) mounted on the base (1) and a first pipe (202) mounted on the boiler body (201). The conveying pipe (11) is connected to the burner interface of the boiler body (201). A sleeve heat exchanger (211) is installed on the pulverized coal pipe (9). A spiral blade (213) is fixedly connected between the pulverized coal pipe (9) and the sleeve heat exchanger (211). A sixth pipe (210) is installed at both the inlet and outlet of the sleeve heat exchanger (211). Every four sixth pipes (210) A regulating valve (209) is installed between 10), a fifth pipe (208) is installed on the regulating valve (209), a first isolation valve (207) is installed on the fifth pipe (208), a fourth pipe (206) is installed between the two first isolation valves (207), a third pipe (205) is fixedly connected to the upper fourth pipe (206), a pressure reducing valve (204) is installed on the third pipe (205), and a second pipe (203) is installed between the pressure reducing valve (204) and the first pipe (202). The second heating structure (3) includes a steam turbine (301) mounted on the base (1) and an eighth pipe (302) mounted on the steam turbine (301). The other end of the first pipe (202) is mounted on the steam turbine (301). A high-pressure heater (305) is mounted on the base (1). A second isolation valve (303) is mounted on the eighth pipe (302). A ninth pipe (304) is installed between the second isolation valve (303) and the high-pressure heater (305). A seventh pipe (212) is fixedly connected between the high-pressure heater (305) and the fourth pipe (206) below. A tenth pipe (306) is installed between the high-pressure heater (305) and the water pump inlet of the boiler body (201). The maintenance structure (6) includes three maintenance doors (601) detachably connected to the coal mill body (7) and three mounting sleeves (602) installed on the coal mill body (7). The mounting sleeves (602) are slidably connected with mounting blocks (603). The three mounting blocks (603) are respectively engaged with the three maintenance doors (601). The cross section of the mounting blocks (603) is trapezoidal. A guide block (605) is fixedly connected to the mounting block (603), a spring (606) is fixedly connected between the guide block (605) and the mounting sleeve (602), and a pull plate (604) is fixedly connected to the mounting block (603). A connecting frame (608) is slidably connected inside the inspection door (601). A sealing ring (607) is fixedly connected to the connecting frame (608). The sealing ring (607) abuts against the coal mill body (7). A sliding rod (609) is fixedly connected to the connecting frame (608). A second lead screw (610) is rotatably connected to the sliding rod (609). The second lead screw (610) is threadedly connected to the inspection door (601). A rotating rod (611) is fixedly connected to the second lead screw (610).

2. The device for simultaneously increasing the air and water temperatures of a boiler coal mill according to claim 1, characterized in that: The adjustment structure (4) includes a guide frame (401) mounted on the base (1) and an adjustment plate (402) slidably connected in the guide frame (401). A first lead screw (403) is rotatably connected inside the guide frame (401), and the adjustment plate (402) is threadedly connected to the first lead screw (403).

3. The device for simultaneously increasing the air and water temperatures of a boiler coal mill according to claim 2, characterized in that: A guide rod (405) is fixedly connected inside the guide frame (401). The adjusting plate (402) is slidably connected to the guide rod (405). An adjusting shaft (406) is rotatably connected to the adjusting plate (402). A second motor (407) is installed at the bottom of the adjusting plate (402). The adjusting shaft (406) is fixedly connected to the output shaft of the second motor (407). A first motor (404) is installed on the guide frame (401). The first lead screw (403) is fixedly connected to the output shaft of the first motor (404).

4. The device for simultaneously increasing the air and water temperatures of a boiler coal mill according to claim 3, characterized in that: The crushing structure (5) includes a feed box (501) fixedly connected to the adjusting shaft (406) and a connecting shaft (502) rotatably connected to the feed box (501). A crushing roller (503) is fixedly connected to the connecting shaft (502), and a gear (504) is fixedly connected to the connecting shaft (502). The two gears (504) mesh with each other.

5. The device for simultaneously increasing the air and water temperatures of a boiler coal mill according to claim 4, characterized in that: A mounting base (505) is fixedly connected to the feeding box (501), and a third motor (506) is mounted on the mounting base (505). One of the connecting shafts (502) is fixedly connected to the output shaft of the third motor (506).

6. The device for simultaneously increasing the air and water temperatures of a boiler coal mill according to claim 5, characterized in that: The bottom of the feeding box (501) is fixedly connected to two connecting sleeves (507), and the two connecting sleeves (507) are slidably connected to the two feeding pipes (8) respectively.

7. A method for simultaneously increasing the air and water temperatures of a boiler coal mill according to any one of claims 1-6, characterized in that, Includes the following steps: S1: A portion of high-temperature steam is drawn from the steam system of the first heating structure (2), and transported to the primary air and exchanged with the primary air to transfer heat to the primary air, thereby increasing the temperature of the primary air and drying the pulverized coal. When the feedwater flows through the second heating structure (3), the temperature is gradually increased through heat exchange with the high-temperature medium, so that the feedwater temperature rises steadily to the set target value, and the preheated feedwater enters the boiler body (201). S2: Before the material enters the coal mill body (7), it is initially crushed by the crushing structure (5) and then fed into the coal mill body (7) after being turned into small pieces. At the same time, when it is necessary to maintain or replace the crushing components in the crushing structure (5), the height of the crushing structure (5) can be adjusted by adjusting the structure (4). S3: During maintenance, the coal grinding components inside the coal mill body (7) are replaced and maintained by the maintenance structure (6).

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