A method and device for drying coal in a pulverizing system of a boiler at a low load by using main steam

Abstract

The present application relates to the field of coal-fired boiler energy saving and emission reduction technology, specifically to a kind of dry device for improving boiler low load pulverizing system using main steam, including boiler, main route mechanism is connected on the boiler, bypass mechanism is also connected on the boiler, filter mechanism is installed on the main route mechanism, driving mechanism is installed on the filter mechanism, limiting mechanism is installed on the filter mechanism, abutment mechanism is installed on the filter mechanism, sealing mechanism is installed on the filter mechanism;Through the cooperation of main route mechanism and bypass mechanism, improve the dry output of coal-fired boiler low load pulverizing system and the temperature of boiler feed water, through filter mechanism and driving mechanism, the air intake system on main route mechanism is filtered, through the cooperation of limiting mechanism and abutment mechanism, limiting control of driving mechanism is realized, and abutment mechanism drives sealing mechanism to be sealed tightly to filter mechanism.

Description

Technical Field

[0001] This invention relates to the field of energy conservation and emission reduction technology for coal-fired boilers, specifically to a drying device and method for improving the low-load pulverizing system of a boiler using main steam. Background Technology

[0002] Energy is the cornerstone and engine of the economy; economic development cannot be separated from energy. As the largest energy-producing industry, the thermal power industry has been, is, and will continue to be the biggest support for economic development for a considerable period of time. With the economic boom, the total installed capacity of the power industry has increased. In the following decade or so, the power industry has flourished, with installed capacity and total power generation increasing year by year. However, with the development and application of thermal power technology, there are also inherent drawbacks in integrated systems.

[0003] During the entire process of the boiler driving the steam turbine, currently under low load conditions, the temperature of the hot primary air at the air preheater outlet decreases, which ultimately leads to a decrease in the temperature of the primary air entering the boiler. This decrease in the temperature of the primary air entering the boiler causes the flame center height in the furnace to shift upward, resulting in a series of problems such as a higher excess air coefficient at the furnace outlet, a decrease in boiler efficiency, an increase in desuperheating water volume, and an increase in flue gas temperature. Consequently, the unit's coal consumption increases, seriously affecting the overall economic efficiency of the plant. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a drying device and method for improving a low-load pulverizing system of a boiler using main steam.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a drying device for a low-load pulverizing system of a boiler using main steam, comprising a boiler, a main circuit mechanism connected to the boiler, a bypass mechanism connected to the boiler, a filter mechanism installed on the main circuit mechanism, a drive mechanism installed on the filter mechanism, a limit mechanism installed on the filter mechanism, an abutment mechanism installed on the filter mechanism, and a sealing mechanism installed on the filter mechanism.

[0006] Specifically, the main circuit includes a steam turbine. A steam turbine is installed on one side of the boiler, and the steam turbine is connected to the boiler via a first conveying pipe. A coal mill is installed on one side of the boiler, and the coal mill is connected to the boiler via a first conveying pipe. A high-pressure heater is installed on one side of the steam turbine, and the high-pressure heater is connected to the steam turbine via the first conveying pipe and an extraction isolation valve. The high-pressure heater is also connected to the boiler via the first conveying pipe. An air preheater is installed on the other side of the boiler, and the air preheater is connected to the boiler via a second hot air pipe. The air preheater is also connected to the coal mill via a first hot air pipe.

[0007] Specifically, the bypass mechanism includes a desuperheater. A desuperheater is provided on one side of the boiler. One end of the desuperheater is connected in sequence to a pressure reducing regulating valve and a steam isolation valve via a second delivery pipe. The steam isolation valve is connected to the boiler via the second delivery pipe. A hot water regulating valve and a hot water isolation valve are connected in sequence to one side of the desuperheater via the second delivery pipe. The other end of the desuperheater is connected to a hot air heat exchanger via the second delivery pipe. The hot air heat exchanger is connected to a high-pressure heater via the second delivery pipe. The first hot air pipe is connected to the coal mill via the hot air heat exchanger.

[0008] Specifically, the filtration mechanism includes a fixing frame, one end of the air preheater is equipped with the fixing frame, the fixing frame is a frame structure, a slot is provided on one side of the fixing frame, an installation plate is slidably connected inside the slot, and filter cotton is installed at the center of the installation plate.

[0009] Specifically, rubber pads are installed on both sides of the mounting plate, and the rubber pads are slidably connected to the inside of the slot.

[0010] Specifically, the drive mechanism includes a rotating shaft, with rotating shafts rotatably connected to the side walls at both ends of the fixed frame. Gears are installed at both ends of the two sets of rotating shafts, and the two sets of gears are rotatably connected to the inside of the fixed frame through the rotating shafts. The edges of the two sets of gears extend into the slots. Racks are fixedly connected to the top and bottom of both sides of the mounting plate, and multiple racks mesh with multiple gears. The top of one of the rotating shafts extends to the outside of the fixed frame, and a nut is installed on the top of the rotating shaft.

[0011] Specifically, each of the two rotating shafts has a pulley mounted on its top. The pulleys are rotatably connected to the inside of the fixed frame via the rotating shafts, and the two pulleys are connected by a transmission belt.

[0012] Specifically, the limiting mechanism includes a locking block. The locking block is installed inside one end of the fixing frame. The locking block is slidably connected to the inside of the fixing frame through an abutment spring. One end of the locking block has a toothed structure and abuts against one of the gears.

[0013] Specifically, the abutting mechanism includes a push rod. The push rod is installed inside one end of the fixing frame. The push rod is slidably connected to the inside of the fixing frame through a return spring. One end of the push rod extends to one side of the locking block, and the other end of the push rod has a hemispherical structure. A pressure plate is slidably connected inside the fixing frame. A screw is rotatably connected to the top of the pressure plate. The screw extends to the outer side of the top of the fixing frame and is threadedly connected to the fixing frame. A trapezoidal drive groove is provided on the bottom side of one end of the pressure plate, and the other end of the push rod extends to the bottom of the drive groove.

[0014] Specifically, the sealing mechanism includes a sealing gasket, and sealing gaskets are installed on both sides inside the slot. The sealing gasket is a hollow frame structure. The sealing gasket abuts against the rubber gasket on the side wall of the mounting plate. An air storage bag is installed at the bottom of the pressure plate. The bottom of the air storage bag is connected to the two sealing gaskets through a connecting pipe.

[0015] A method for improving the drying device of a low-load pulverizing system in a boiler using main steam includes the following steps:

[0016] S1: Main route: Through the combustion of the boiler, steam enters the steam turbine to work, thereby realizing the conversion of kinetic energy. At the same time, by controlling the extraction isolation valve, a part of the steam is extracted from the steam turbine and enters the high-pressure heater to heat the water. The heated water can then enter the boiler, allowing waste heat to be reused, reducing the boiler's energy consumption and improving the water heating efficiency. Furthermore, the cold air is preheated by the air preheater and then transported to the boiler through the second hot air pipe to ensure complete combustion. Meanwhile, a part of the hot air from the air preheater is transported to the coal mill through the first hot air pipe to facilitate the drying of pulverized coal and increase the intensity of pulverized coal combustion. At this time, the hot air discharged from the coal mill can re-enter the boiler for combustion, thereby greatly saving energy consumption and increasing the overall efficiency.

[0017] S2: Bypass: After the exhaust isolation valve is closed, the bypass steam output from the boiler enters the pressure reducing regulating valve through the steam isolation valve for pressure reduction. The pressure-reduced steam then enters the desuperheater. With the cooperation of the hot water isolation valve, the hot water enters the hot water regulating valve to regulate the flow rate before entering the desuperheater, which helps to cool the steam in the desuperheater. The pressure-reduced and de-pressurized steam then enters the hot air heat exchanger, which further heats the hot air inside the first hot air pipe. The heated air then enters the coal mill to further dry the coal powder, improving the combustion efficiency. At the same time, the pressure-reduced and de-pressurized steam finally enters the high-pressure heater through the second conveying pipe to heat the water before being sent back to the boiler, which facilitates the reuse of steam.

[0018] S3: Then insert the filter mechanism and the main circuit mechanism into the installation, and then rotate the drive mechanism to make the filter mechanism stable. By rotating the drive mechanism in the opposite direction, it is easy to disassemble and maintain the filter element of the filter mechanism.

[0019] S4: Finally, the contact mechanism is operated. The contact mechanism contacts the limit mechanism, which limits the drive mechanism, making the filter mechanism stable. At the same time, the contact mechanism controls the sealing mechanism to work, thereby sealing the filter mechanism tightly.

[0020] The beneficial effects of this invention are:

[0021] (1) The present invention provides a drying device and method for improving the low-load pulverizing system of a boiler by using main steam. Through the cooperation and connection between the main circuit mechanism and the boiler, the boiler is fully heated and burned, while the steam is recovered and utilized to dry the pulverized coal, thus saving energy.

[0022] (2) The present invention provides a drying device and method for improving the low-load pulverizing system of a boiler by utilizing the main steam. Through the cooperation of the bypass mechanism and the main mechanism, the main mechanism provides heat utilization, thereby increasing the drying output of the pulverizing system, reducing the coal consumption of the unit, and increasing the water temperature, thereby reducing energy consumption.

[0023] (3) The present invention provides a drying device and method for improving the low-load pulverizing system of a boiler by using main steam. Through the cooperation of the filtration mechanism and the drive mechanism, the air intake system on the main circuit mechanism is filtered, and it is easy to clean and replace, and easy to disassemble and assemble.

[0024] (4) The present invention provides a drying device and method for improving the low-load pulverizing system of a boiler by using main steam. Through the cooperation of the limiting mechanism and the resisting mechanism, the driving mechanism is limited and controlled, thereby making the filter mechanism stable to install and easy to disassemble and reassemble.

[0025] (5) The present invention provides a drying device and method for improving the low-load pulverizing system of a boiler by using main steam. Through the operation of the contact mechanism, the sealing mechanism is driven so that the sealing mechanism seals the filter mechanism tightly. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 A schematic diagram of the connection structure between the bypass mechanism and the boiler provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the connection structure between the main path mechanism and the bypass mechanism of the present invention;

[0029] Figure 3 This is a schematic diagram of the connection structure between the mounting plate and the fixing frame of the present invention;

[0030] Figure 4 This is a schematic diagram of the connection structure between the filter cotton and the fixing frame of the present invention;

[0031] Figure 5 This is a schematic diagram of the connection structure between the gear and the fixing frame of the present invention;

[0032] Figure 6 This is a schematic diagram of the connection structure between the rack and the mounting plate of the present invention;

[0033] Figure 7This is a schematic diagram of the connection structure between the gear and the rack of the present invention;

[0034] Figure 8 This is a schematic diagram of the connection structure between the card block and the gear of the present invention;

[0035] Figure 9 This is a schematic diagram of the connection structure between the contact spring and the locking block of the present invention;

[0036] Figure 10 This is a schematic diagram of the connection structure between the pressure plate and the air storage bag of the present invention.

[0037] In the diagram: 1. Boiler; 2. Main system; 201. First conveying pipe; 202. Steam turbine; 203. Extraction isolation valve; 204. High-pressure heater; 205. Air preheater; 206. Second hot air pipe; 207. First hot air pipe; 208. Coal mill; 3. Bypass system; 301. Second conveying pipe; 302. Steam isolation valve; 303. Pressure reducing regulating valve; 304. Desuperheater; 305. Hot air heat exchanger; 306. Hot water isolation valve; 307. Hot water regulating valve; 4. Filtration system; 401. Fixing frame; 402. Mounting plate; 403. Filter cotton; 404. Slot; 405. Rubber pad; 5. Drive mechanism; 501. Nut; 502. Gear; 503. Rack; 504. Shaft; 505. Pulley; 506. Drive belt; 6. Limiting mechanism; 601. Locking block; 602. Abutting spring; 7. Abutting mechanism; 701. Screw; 702. Pressure plate; 703. Top rod; 704. Return spring; 705. Drive groove; 8. Sealing mechanism; 801. Sealing gasket; 802. Air reservoir; 803. Connecting pipe. Detailed Implementation

[0038] 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.

[0039] like Figure 1 , Figure 2 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, the present invention discloses a drying device for improving a low-load pulverizing system of a boiler using main steam, comprising a boiler 1, a main circuit mechanism 2 connected to the boiler 1, a bypass mechanism 3 connected to the boiler 1, a filter mechanism 4 installed on the main circuit mechanism 2, a drive mechanism 5 installed on the filter mechanism 4, a limit mechanism 6 installed on the filter mechanism 4, an abutment mechanism 7 installed on the filter mechanism 4, and a sealing mechanism 8 installed on the filter mechanism 4.

[0040] Specifically, such as Figure 1As shown, the main circuit mechanism 2 includes a steam turbine 202. The steam turbine 202 is installed on one side of the boiler 1, and the steam turbine 202 is connected to the boiler 1 via a first conveying pipe 201. A coal mill 208 is installed on one side of the boiler 1, and the coal mill 208 is connected to the boiler 1 via the first conveying pipe 201. A high-pressure heater 204 is installed on one side of the steam turbine 202, and the high-pressure heater 204 is connected to the steam turbine 202 via the first conveying pipe 201 and an extraction isolation valve 203. The high-pressure heater 204 is also connected to the boiler 1 via the first conveying pipe 201. An air preheater 205 is installed on the other side of the boiler 1, and the air preheater 205 is connected to the boiler 1 via a second hot air pipe 206. The air preheater 205 is connected to the coal mill 208 via a first hot air pipe 207. The combustion gas from the boiler 1... The steam is drawn into the steam turbine 202 to work, thereby realizing the conversion of kinetic energy. At the same time, by controlling the extraction isolation valve 203, a part of the steam is drawn from the steam turbine 202 into the high-pressure heater 204 to heat the water, so that the heated water can enter the boiler 1, allowing the waste heat to be reused, reducing the energy consumption of the boiler 1 and improving the water heating efficiency. Furthermore, the cold air is preheated by the air preheater 205 and delivered to the boiler 1 through the second hot air pipe 206, so that the boiler 1 can burn completely. At the same time, a part of the hot air from the air preheater 205 is delivered to the coal mill 208 through the first hot air pipe 207, which is conducive to drying the coal powder and increasing the combustion intensity of the coal powder. At this time, the hot air discharged from the coal mill 208 can re-enter the boiler 1 for combustion, thereby greatly saving energy consumption and increasing the overall efficiency.

[0041] Specifically, such as Figure 2As shown, the bypass mechanism 3 includes a desuperheater 304. A desuperheater 304 is provided on one side of the boiler 1. One end of the desuperheater 304 is sequentially connected to a pressure reducing valve 303 and a steam isolation valve 302 via a second delivery pipe 301. The steam isolation valve 302 is connected to the boiler 1 via the second delivery pipe 301. A hot water regulating valve 307 and a hot water isolation valve 306 are sequentially connected to one side of the desuperheater 304 via the second delivery pipe 301. The other end of the desuperheater 304 is connected to a hot air heat exchanger 305 via the second delivery pipe 301. The hot air heat exchanger 305 is connected to a high-pressure heater 204 via the second delivery pipe 301. The first hot air pipe 207 is connected to a coal mill 208 via the hot air heat exchanger 305. The bypass steam output from inside the boiler 1 passes through the desuperheater 304. The steam isolation valve 302 enters the pressure reducing regulating valve 303 to reduce the pressure. The reduced-pressure steam then enters the desuperheater 304. With the cooperation of the hot water isolation valve 306, hot water enters the hot water regulating valve 307 to regulate the flow rate before entering the desuperheater 304, which helps to cool the steam in the desuperheater 304. The depressurized and de-cooled steam then enters the hot air heat exchanger 305, further heating the hot air inside the first hot air pipe 207. The heated air then enters the coal mill 208 to further dry the coal powder, improving the combustion efficiency. At the same time, the depressurized and de-cooled steam finally enters the high-pressure heater 204 through the second conveying pipe 301 to heat the water before being sent to the boiler 1, thus facilitating the reuse of steam.

[0042] Specifically, such as Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the filtration mechanism 4 includes a fixing frame 401. The fixing frame 401 is installed at one end of the air preheater 205. The fixing frame 401 has a frame structure. A slot 404 is provided on one side of the fixing frame 401. An installation plate 402 is slidably connected inside the slot 404. A filter cotton 403 is installed at the center of the installation plate 402. The installation of the fixing frame 401 facilitates the connection of the installation plate 402. The filter cotton 403 on the installation plate 402 facilitates the filtration of incoming cold air, blocking impurities and moisture. Furthermore, the slot 404 allows the installation plate 402 to be slidably installed and removed from the fixing frame 401, facilitating the subsequent replacement of the filter cotton 403.

[0043] Specifically, such as Figure 6 and Figure 7As shown, rubber pads 405 are respectively installed on both sides of the mounting plate 402. The rubber pads 405 are slidably connected to the inside of the slot 404. The installation of the rubber pads 405 helps to reduce the gap between the mounting plate 402 and the slot 404 after the mounting plate 402 is inserted into the slot 404. The rubber pads 405 are elastic and play a role in sealing and stabilizing the installation of the mounting plate 402.

[0044] Specifically, such as Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the drive mechanism 5 includes a rotating shaft 504. The rotating shaft 504 is rotatably connected to the side walls of both ends of the fixed frame 401. Gears 502 are mounted on both ends of the two sets of rotating shafts 504. The two sets of gears 502 are rotatably connected to the interior of the fixed frame 401 via the rotating shafts 504. The edges of the two sets of gears 502 extend into the slots 404. Racks 503 are fixedly connected to the top and bottom of both sides of the mounting plate 402. Multiple racks 503 mesh with multiple gears 502. The top of one of the rotating shafts 504 extends into the fixed frame. On the outside of 401, a nut 501 is installed on the top of the rotating shaft 504. By installing two sets of the rotating shafts 504, multiple sets of gears 502 are rotatably connected. By installing the rack 503 on the side wall of the mounting plate 402, after the mounting plate 402 is inserted into the slot 404, the rotation of the rotating shaft 504 is controlled by driving the nut 501 with a wrench. This allows the gears 502 to drive the rack 503 to move, thereby causing the mounting plate 402 to slide out or in. This enables convenient disassembly and assembly of the mounting plate 402, making the operation more labor-saving.

[0045] Specifically, such as Figure 7 and Figure 8 As shown, pulleys 505 are respectively mounted on the top of the two rotating shafts 504. The pulleys 505 are rotatably connected to the inside of the fixing frame 401 through the rotating shafts 504. The two pulleys 505 are connected by a transmission belt 506. With the pulleys 505 mounted on the two rotating shafts 504 on the same side, the two rotating shafts 504 rotate synchronously with the cooperation of the transmission belt 506, thereby causing the two gears 502 to drive the rack 503 to move synchronously, so as to realize the smooth assembly and disassembly of the mounting plate 402.

[0046] Specifically, such as Figure 8 and Figure 9As shown, the limiting mechanism 6 includes a locking block 601. The locking block 601 is installed inside one end of the fixing frame 401. The locking block 601 is slidably connected to the inside of the fixing frame 401 through a contact spring 602. One end of the locking block 601 has a toothed structure and abuts against one of the gears 502. With the installation of the locking block 601 and the cooperation of the contact spring 602, the locking block 601 has telescopic sliding. The locking block 601 always maintains contact with the gear 502, which plays a role in limiting the contact of the gear 502. Since one end of the locking block 601 has a toothed structure, when the gear 502 rotates with a certain force, the gear 502 abuts against the locking block 601, so that the locking block 601 can retract, thereby making the gear 502 rotate a certain angle, which helps the gear 502 not to loosen and makes the mounting plate 402 installed stably and not slip off.

[0047] Specifically, such as Figure 5 , Figure 8 and Figure 10 As shown, the abutting mechanism 7 includes a push rod 703. The push rod 703 is installed inside one end of the fixing frame 401. The push rod 703 is slidably connected to the inside of the fixing frame 401 via a return spring 704. One end of the push rod 703 extends to one side of the locking block 601, and the other end of the push rod 703 has a hemispherical structure. A pressure plate 702 is slidably connected inside the fixing frame 401. A screw 701 is rotatably connected to the top of the pressure plate 702. The screw 701 extends to the outer side of the top of the fixing frame 401 and is threadedly connected to the fixing frame 401. A trapezoidal drive groove 705 is provided on the bottom side of one end of the pressure plate 702, and the other end of the push rod 703 extends... At the bottom of the drive groove 705, through the installation of the push rod 703, under the abutment of the return spring 704, the push rod 703 separates from the locking block 601, facilitating the free sliding of the locking block 601. By rotating the screw 701, the pressure plate 702 slides down under the action of the thread. The drive groove 705 on one side of the pressure plate 702 abuts against the push rod 703, causing the push rod 703 to escape the elastic sliding of the return spring 704. The push rod 703 abuts against the locking block 601, and the locking block 601 cannot rotate, thereby stabilizing the gear 502. The mounting plate 402 is securely installed inside the fixing frame 401.

[0048] Specifically, such as Figure 5 , Figure 8 and Figure 10As shown, the sealing mechanism 8 includes a sealing gasket 801. Sealing gaskets 801 are installed on both sides of the slot 404. Each sealing gasket 801 has a hollow frame structure. The sealing gasket 801 abuts against the rubber gasket 405 on the side wall of the mounting plate 402. An air reservoir 802 is installed at the bottom of the pressure plate 702. The bottom of the air reservoir 802 is connected to the two sealing gaskets 801 via a connecting pipe 803. With the installation of the sealing gasket 801, when the pressure plate 702 slides down and abuts against the top rod 703, the air reservoir 802 is compressed and deformed, allowing air inside the air reservoir 802 to enter the sealing gasket 801. This causes the sealing gasket 801 to expand and abut tightly against the rubber gasket 405 on the side wall of the mounting plate 402, resulting in better sealing.

[0049] A method for improving the drying device of a low-load pulverizing system in a boiler using main steam includes the following steps:

[0050] S1: Main route: Through the combustion of the boiler 1, steam enters the steam turbine 202 to work, thereby realizing kinetic energy conversion. At the same time, by controlling the extraction isolation valve 203, a part of the steam is extracted from the steam turbine 202 and enters the high-pressure heater 204 to heat the water, so that the heated water can enter the boiler 1, making waste heat reuse, reducing the energy consumption of the boiler 1, and improving the water heating efficiency. Furthermore, the cold air is preheated by the air preheater 205 and delivered to the boiler 1 through the second hot air pipe 206, so that the boiler 1 can burn completely. At the same time, a part of the hot air from the air preheater 205 is delivered to the coal mill 208 through the first hot air pipe 207, which is beneficial to the drying of coal powder and increases the combustion intensity of coal powder. At this time, the hot air discharged from the coal mill 208 can re-enter the boiler 1 for combustion, thereby greatly saving energy consumption and increasing the overall efficiency.

[0051] S2: Bypass: After the exhaust isolation valve 203 is closed, the bypass steam output from the boiler 1 enters the pressure reducing regulating valve 303 through the steam isolation valve 302 for pressure reduction. The pressure-reduced steam then enters the desuperheater 304. With the cooperation of the hot water isolation valve 306, hot water enters the hot water regulating valve 307 to regulate the flow rate before entering the desuperheater 304, which helps to cool the steam in the desuperheater 304. The pressure-reduced and de-heated steam then enters the hot air heat exchanger 305, thereby further heating the hot air inside the first hot air pipe 207. The heated air then enters the coal mill 208 to further dry the coal powder, improving the combustion intensity. At the same time, the pressure-reduced and de-heated steam finally enters the high-pressure heater 204 through the second conveying pipe 301 to heat the water before being sent back to the boiler 1, which facilitates the reuse of steam.

[0052] S3: Then insert the filter mechanism 4 and the main circuit mechanism 2 into the installation, and then rotate the drive mechanism 5 to make the filter mechanism 4 installed stably. By rotating the drive mechanism 5 in the opposite direction, it is convenient to disassemble and maintain the filter element of the filter mechanism 4.

[0053] S4: Finally, the contact mechanism 7 is operated. The contact mechanism 7 contacts the limit mechanism 6, so that the limit mechanism 6 limits the drive mechanism 5, making the filter mechanism 4 installed stably. At the same time, the contact mechanism 7 controls the sealing mechanism 8 to work, thereby sealing the filter mechanism 4 tightly.

[0054] In operation, this invention utilizes the combustion of steam in boiler 1 to allow steam to enter the turbine 202 for operation, thereby achieving kinetic energy conversion. Simultaneously, by controlling the extraction isolation valve 203, a portion of steam is extracted from the turbine 202 and fed into the high-pressure heater 204 to heat water. This heated water then enters boiler 1, allowing waste heat to be reused, reducing boiler 1's energy consumption and improving heating efficiency. Furthermore, cold air is preheated by air preheater 205 and delivered to boiler 1 through the second hot air pipe 206, ensuring complete combustion. Simultaneously, a portion of the hot air from air preheater 205 is delivered to the coal mill 208 through the first hot air pipe 207, facilitating coal powder drying and increasing combustion intensity. The hot air discharged from the coal mill 208 can then re-enter boiler 1. Combustion increases the heat inside boiler 1, lowers the flame center, and is beneficial to combustion within boiler 1, thus increasing overall efficiency. The bypass steam output from boiler 1 enters the pressure-reducing regulating valve 303 through steam isolation valve 302 for pressure reduction. The reduced-pressure steam then enters the desuperheater 304. With the cooperation of hot water isolation valve 306, hot water enters the hot water regulating valve 307 to regulate its flow before entering the desuperheater 304, facilitating the cooling of the steam in the desuperheater 304. The depressurized and deheated steam then enters the hot air heat exchanger 305, further heating the hot air inside the first hot air pipe 207. The heated air then enters the coal mill 208 to further dry the pulverized coal, improving combustion intensity. Simultaneously, the depressurized and deheated steam ultimately passes through… The second delivery pipe 301 enters the high-pressure heater 204 to heat the water before sending it into the boiler 1, thus facilitating steam reuse. The mounting bracket 401 facilitates the connection to the mounting plate 402. The filter cotton 403 on the mounting plate 402 filters the incoming cold air, blocking impurities and moisture. The slot 404 allows the mounting plate 402 to slide and detach from the mounting bracket 401, facilitating subsequent replacement of the filter cotton 403. The installation of the rubber gasket 405 reduces the gap between the mounting plate 402 and the slot 404 after insertion. The elastic rubber gasket 405 provides a seal and stability for the mounting plate 402. The installation of two sets of rotating shafts 504 further enhances the connection between the mounting plate 402 and the slot 404. Multiple sets of gears 502 are rotatably connected. A rack 503 is installed on the side wall of the mounting plate 402. After the mounting plate 402 is inserted into the slot 404, a wrench drives the nut 501, controlling the rotation of the rotating shaft 504. This causes the gears 502 to drive the rack 503, allowing the mounting plate 402 to slide in or out, facilitating easy installation and removal of the mounting plate 402 with less effort. Pulleys 505 are installed on two rotating shafts 504 on the same side. With the cooperation of the transmission belt 506, the two rotating shafts 504 rotate synchronously, causing the two gears 502 to synchronously drive the rack 503, enabling smooth installation and removal of the mounting plate 402. The installation of a locking block 601, in cooperation with the contact spring 602, allows for telescopic sliding.The locking block 601 always remains in contact with the gear 502, serving to limit the contact of the gear 502. Since one end of the locking block 601 has a toothed structure, when the gear 502 rotates with a certain force, the gear 502 contacts the locking block 601, allowing the locking block 601 to retract and thus causing the gear 502 to rotate at a certain angle. This helps prevent the gear 502 from loosening, ensuring stable installation of the mounting plate 402 and preventing slippage. Through the installation of the push rod 703, under the contact of the return spring 704, the push rod 703 separates from the locking block 601, facilitating free sliding of the locking block 601. The rotation of the screw 701, under the action of the thread, causes the pressure plate 7... As the pressure plate 702 slides down, the drive groove 705 on one side of the pressure plate 702 abuts against the push rod 703, causing the push rod 703 to slide away from the elastic force of the return spring 704. The push rod 703 then abuts against the locking block 601, preventing the locking block 601 from rotating. This stabilizes the gear 502, and the mounting plate 402 is securely installed inside the fixing frame 401. Through the installation of the sealing gasket 801, when the pressure plate 702 slides down and abuts against the push rod 703, the air reservoir 802 is compressed and deformed, allowing air inside the air reservoir 802 to enter the sealing gasket 801. This causes the sealing gasket 801 to expand and make tight contact with the rubber gasket 405 on the side wall of the mounting plate 402, resulting in better sealing.

[0055] 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.

[0056] 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 drying device for a low-load pulverizing system of a boiler using main steam, characterized in that, Includes a boiler (1), a main circuit mechanism (2) connected to the boiler (1), a bypass mechanism (3) also connected to the boiler (1), a filter mechanism (4) installed on the main circuit mechanism (2), a drive mechanism (5) installed on the filter mechanism (4), a limit mechanism (6) installed on the filter mechanism (4), a contact mechanism (7) installed on the filter mechanism (4), and a sealing mechanism (8) installed on the filter mechanism (4); The main road mechanism (2) includes a steam turbine (202). The steam turbine (202) is installed on one side of the boiler (1). The steam turbine (202) and the boiler (1) are connected by a first conveying pipe (201). A coal mill (208) is installed on one side of the boiler (1). The coal mill (208) and the boiler (1) are connected by a first conveying pipe (201). A high-pressure heater (204) is installed on one side of the steam turbine (202). 04) The high-pressure heater (204) is connected to the steam turbine (202) through the first conveying pipe (201) and the exhaust isolation valve (203). The high-pressure heater (204) is connected to the boiler (1) through the first conveying pipe (201). An air preheater (205) is installed on the other side of the boiler (1). The air preheater (205) is connected to the boiler (1) through the second hot air pipe (206). The air preheater (205) is connected to the coal mill (208) through the first hot air pipe (207). The bypass mechanism (3) includes a desuperheater (304). A desuperheater (304) is provided on one side of the boiler (1). One end of the desuperheater (304) is connected in sequence to a pressure reducing valve (303) and a steam isolation valve (302) through a second conveying pipe (301). The steam isolation valve (302) is connected to the boiler (1) through the second conveying pipe (301). One side of the desuperheater (304) is connected in sequence to a hot water regulating valve (307) and a hot water isolation valve (306) through the second conveying pipe (301). The other end of the desuperheater (304) is connected to a hot air heat exchanger (305) through the second conveying pipe (301). The hot air heat exchanger (305) is connected to a high-pressure heater (204) through the second conveying pipe (301). The first hot air pipe (207) is connected to a coal mill (208) through the hot air heat exchanger (305). The filtration mechanism (4) includes a fixing frame (401). The fixing frame (401) is installed at one end of the air preheater (205). The fixing frame (401) is a frame structure. A slot (404) is provided on one side of the fixing frame (401). An installation plate (402) is slidably connected inside the slot (404). A filter cotton (403) is installed at the center of the installation plate (402). The drive mechanism (5) includes a rotating shaft (504). The rotating shaft (504) is rotatably connected to the side walls of both ends of the fixed frame (401). Gears (502) are installed at both ends of the two sets of rotating shafts (504). The two sets of gears (502) are rotatably connected to the inside of the fixed frame (401) through the rotating shafts (504). The edges of the two sets of gears (502) extend into the slots (404). Racks (503) are fixedly connected to the top and bottom of both sides of the mounting plate (402). Multiple racks (503) mesh with multiple gears (502). The top of one of the rotating shafts (504) extends to the outside of the fixed frame (401). A nut (501) is installed on the top of the rotating shaft (504). Two of the rotating shafts (504) are respectively equipped with pulleys (505) on their tops. The pulleys (505) are rotatably connected to the inside of the fixed frame (401) through the rotating shafts (504). The two pulleys (505) are connected to each other by a transmission belt (506). The limiting mechanism (6) includes a locking block (601). The locking block (601) is installed inside one end of the fixing frame (401). The locking block (601) is slidably connected to the inside of the fixing frame (401) through a contact spring (602). One end of the locking block (601) has a toothed structure and one end of the locking block (601) abuts against one of the gears (502). The abutting mechanism (7) includes a push rod (703). The push rod (703) is installed inside one end of the fixed frame (401). The push rod (703) is slidably connected to the inside of the fixed frame (401) through a return spring (704). One end of the push rod (703) extends to one side of the locking block (601). The other end of the push rod (703) is a hemispherical structure. A pressure plate (702) is slidably connected inside the fixed frame (401). A screw (701) is rotatably connected to the top of the pressure plate (702). The screw (701) extends to the outer side of the top of the fixed frame (401). The screw (701) is threadedly connected to the fixed frame (401). A trapezoidal drive groove (705) is provided on the bottom side of one end of the pressure plate (702). The other end of the push rod (703) extends to the bottom of the drive groove (705). The sealing mechanism (8) includes a sealing gasket (801). The sealing gasket (801) is installed on both sides of the slot (404). The sealing gasket (801) is a hollow frame structure. The sealing gasket (801) abuts against the rubber gasket (405) on the side wall of the mounting plate (402). An air storage bag (802) is installed at the bottom of the pressure plate (702). The bottom of the air storage bag (802) is connected to the two sealing gaskets (801) through a connecting pipe (803).

2. The drying device for a low-load pulverizing system of a boiler using main steam as described in claim 1, characterized in that: Rubber pads (405) are installed on both sides of the mounting plate (402), and the rubber pads (405) are slidably connected to the inside of the slot (404).

3. A method for improving the drying device of a low-load pulverizing system of a boiler using main steam according to any one of claims 1-2, characterized in that: Includes the following steps: S1: Main route: When the boiler (1) is burning, steam enters the turbine (202) to work and realize kinetic energy conversion. At the same time, by controlling the extraction isolation valve (203), a part of the steam is extracted from the turbine (202) and enters the high-pressure heater (204) to heat the water, so that the heated water can enter the boiler (1). The air preheater (205) preheats the cold air and delivers it to the boiler (1) through the second hot air pipe (206) to make the boiler (1) burn completely. At the same time, a part of the hot air from the air preheater (205) is delivered to the coal mill (208) through the first hot air pipe (207). At this time, the hot air discharged from the coal mill (208) can re-enter the boiler (1) for combustion. S2: Bypass: After the exhaust isolation valve (203) is closed, the bypass steam output from the boiler (1) enters the pressure reducing regulating valve (303) through the steam isolation valve (302) to reduce the pressure. The reduced steam enters the desuperheater (304). With the cooperation of the hot water isolation valve (306), the hot water enters the hot water regulating valve (307) to regulate the flow rate and then enters the desuperheater (304). The depressurized and deheated steam enters the hot air heat exchanger (305) to further heat the hot air inside the first hot air pipe (207). The heated air enters the coal mill (208) to further dry the coal powder. At the same time, the depressurized and deheated steam finally enters the high-pressure heater (204) through the second conveying pipe (301) to heat the water and then send it into the boiler (1). S3: Then insert the filter mechanism (4) and the main road mechanism (2) into the installation, and then rotate the drive mechanism (5) to make the filter mechanism (4) installed stably. By rotating the drive mechanism (5) in the opposite direction, the filter element of the filter mechanism (4) can be disassembled and maintained. S4: Finally, the contact mechanism (7) is operated. The contact mechanism (7) contacts the limiting mechanism (6), so that the limiting mechanism (6) limits the driving mechanism (5), so that the filter mechanism (4) is installed stably. At the same time, the contact mechanism (7) controls the sealing mechanism (8) to work, thereby sealing the filter mechanism (4) tightly.

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