Device and method for improving drying performance of boiler low-load coal pulverizing system through main steam

Abstract

The invention relates to the technical field of energy conservation and emission reduction of coal-fired boilers, in particular to a boiler low-load coal pulverizing system drying device improved through main steam, which comprises a boiler, a main path mechanism is connected to the boiler, a bypass mechanism is further connected to the boiler, a filtering mechanism is mounted on the main path mechanism, and the bypass mechanism is mounted on the boiler. The filtering mechanism is provided with a driving mechanism, a limiting mechanism, an abutting mechanism and a sealing mechanism, and the driving mechanism, the limiting mechanism, the abutting mechanism and the sealing mechanism are arranged on the filtering mechanism; through cooperation of the main path mechanism and the bypass mechanism, the drying output of a coal-fired boiler low-load pulverizing system and the boiler feed water temperature are increased, through the filtering mechanism and the driving mechanism, an air inlet system on the main path mechanism is filtered, and through cooperation of the limiting mechanism and the abutting mechanism, limiting control over the driving mechanism is achieved; the sealing mechanism is driven by the abutting mechanism to tightly seal the filtering mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of energy conservation and emission reduction of coal-fired boilers, and in particular to a drying device and method for improving a low-load pulverizing system of a boiler by utilizing main steam. Background Art

[0002] Energy is the cornerstone and engine of the economy, and economic development cannot do without energy. As the largest energy output industry, the thermal power industry will be the biggest support for economic development in the past, present and for a long time in the future. With the economic take-off, the total installed capacity of the power industry has increased. In the following ten years, the power industry has flourished, and the installed capacity and total power generation have increased year by year. With the development and application of thermal power technology, there are also defects in the integrated series.

[0003] During the entire process of the boiler driving the steam turbine, under the current low-load condition of the unit, the temperature of the hot primary air at the outlet of the air preheater decreases, which eventually leads to a decrease in the temperature of the primary air entering the boiler. Due to the decrease in the temperature of the primary air entering the boiler, the center height of the flame in the furnace moves up, resulting in a series of problems such as an increase in the excess air coefficient at the furnace outlet, a decrease in boiler efficiency, an increase in the amount of cooling water, and an increase in the exhaust gas temperature, which in turn leads to an increase in the coal consumption of the unit, seriously affecting the economy of the entire plant. Summary of the invention

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

[0005] The technical solution adopted by the present invention to solve its technical problems is: a drying device for a low-load powder making system of a boiler using main steam, comprising a boiler, a main path mechanism connected to the boiler, a bypass mechanism also connected to the boiler, a filtering mechanism installed on the main path mechanism, a driving mechanism installed on the filtering mechanism, a limiting mechanism installed on the filtering mechanism, a resistance mechanism installed on the filtering mechanism, and a sealing mechanism installed on the filtering mechanism.

[0006] Specifically, the main circuit mechanism includes a steam turbine, a steam turbine is installed on one side of the boiler, the steam turbine and the boiler are connected through a first delivery pipe, a coal mill is installed on one side of the boiler, the coal mill and the boiler are connected through a first delivery pipe, a high-pressure heater is installed on one side of the steam turbine, the high-pressure heater is connected to the steam turbine through the first delivery pipe and an exhaust isolation valve, the high-pressure heater is connected to the boiler through the first delivery pipe, an air preheater is installed on the other side of the boiler, the air preheater is connected to the boiler through a second hot air pipe, and the air preheater is connected to the coal mill through the 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 with a pressure reducing regulating valve and a steam isolating valve through a second delivery pipe, the steam isolating valve is connected to the boiler through the second delivery pipe, one side of the desuperheater is connected in sequence with a warm water regulating valve and a warm water isolating valve through the second delivery pipe, the other end of the desuperheater is connected to a hot air heat exchanger through the second delivery pipe, the hot air heat exchanger is connected to the high-pressure heater through the second delivery pipe, and the first hot air pipe is connected to the coal mill through the hot air heat exchanger.

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

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

[0010] Specifically, the driving mechanism includes a rotating shaft, and the side walls at both ends of the fixed frame are respectively rotatably connected with the rotating shafts, and gears are respectively installed at both ends of the two groups of the rotating shafts. The two groups of gears are respectively rotatably connected to the inside of the fixed frame through the rotating shafts, and the edges of the two groups of gears extend to the inside of the slots respectively. Racks are respectively fixedly connected to the top and bottom of both sides of the mounting plate, and multiple racks are respectively meshed 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, pulleys are respectively installed on the tops of the two rotating shafts, the pulleys are rotatably connected to the inside of the fixing frame through the rotating shafts, and the two pulleys are connected through a transmission belt.

[0012] Specifically, the limiting mechanism includes a card block, which is installed inside one end of the fixing frame. The card block is slidably connected to the inside of the fixing frame through a resistance spring. One end of the card block is a toothed structure, and one end of the card block resists one of the gears.

[0013] Specifically, the resistance mechanism includes a push rod, a push rod is installed inside one end of the fixed frame, the push rod is slidably connected to the inside of the fixed frame through a return spring, one end of the push rod extends to one side of the block, the other end of the push rod is a hemispherical structure, a pressure plate is slidably connected to the inside of the fixed frame, a screw is rotatably connected to the top of the pressure plate, the screw extends to the outside of the top of the fixed frame, the screw is threadedly connected to the fixed frame, a trapezoidal driving 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 driving groove.

[0014] Specifically, the sealing mechanism includes a sealing gasket, which is installed on both sides of the slot, and the sealing gasket is a frame-type structure with a hollow interior. The sealing gasket contacts the rubber pad on the side wall of the mounting plate. An air storage bag is installed at the bottom of the pressure plate, and the bottom of the air storage bag is connected to the two sealing gaskets through a connecting tube.

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

[0016] S1: Main route: Through the combustion of the boiler, steam enters the steam turbine to work, thereby realizing kinetic energy conversion. At the same time, by controlling the exhaust isolation valve, a part of the steam is extracted from the steam turbine to enter the high-pressure heater to heat the water, so that the heated water can enter the boiler, so that the waste heat can be reused, reducing the energy consumption of the boiler and improving the water heating efficiency. In addition, the cold air is preheated by the air preheater and transported to the boiler through the second hot air pipe to ensure full combustion of the boiler. At the same time, a part of the hot air from the air preheater is transported to the coal mill through the first hot air pipe, which is conducive to drying the pulverized coal and increasing the combustion intensity of the pulverized coal. At this time, the hot air discharged from the coal mill can enter the boiler again 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 to reduce the pressure. The steam after pressure reduction enters the desuperheater. Through the cooperation of the warm water isolation valve, the warm water enters the warm water regulating valve to adjust the flow and then enters the desuperheater, which is beneficial to cool the steam in the desuperheater. The steam after pressure reduction and temperature reduction enters the hot air heat exchanger, thereby further heating the hot air inside the first hot air pipe, and the heated air enters the coal mill to further dry the coal powder, thereby improving the combustion intensity. At the same time, the steam after temperature reduction and pressure reduction finally enters the high-pressure heater through the second delivery pipe to heat the water and then is sent to the boiler, which is beneficial to the reuse of the steam;

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

[0019] S4: Finally, the resistance mechanism is controlled, the resistance mechanism resists the limiting mechanism, so that the limiting mechanism limits the driving mechanism, so that the filter mechanism is installed stably, and at the same time, the resistance mechanism controls the sealing mechanism to work, thereby sealing the filter mechanism tightly.

[0020] The beneficial effects of the present invention are:

[0021] (1) The present invention discloses a drying device and method for utilizing main steam to improve the low-load pulverizing system of a boiler. By connecting the main circuit mechanism with the boiler, the boiler can be fully heated and burned. At the same time, the steam can be recycled and the pulverized coal can be dried, thus saving energy.

[0022] (2) The present invention discloses a device and method for utilizing main steam to improve the drying efficiency of a low-load pulverizing system of a boiler. By cooperating with a bypass mechanism and a main mechanism, the heat provided by the main mechanism is utilized to increase the drying output of the pulverizing system, reduce the coal consumption of the unit, increase the water temperature, and reduce energy consumption.

[0023] (3) The present invention discloses a drying device and method for utilizing main steam to improve the low-load powder making system of a boiler. Through the cooperation of a filtering mechanism and a driving mechanism, the air intake system on the main mechanism is filtered, and is easy to clean and replace, and convenient to disassemble and assemble.

[0024] (4) The present invention discloses a drying device and method for utilizing main steam to improve the low-load powder making system of a boiler, which realizes limit control of a driving mechanism through the cooperation of a limit mechanism and a resistance mechanism, thereby making the installation of the filtering mechanism stable and facilitating subsequent disassembly and assembly.

[0025] (5) The present invention discloses a drying device and method for utilizing main steam to improve the drying performance of a low-load pulverizing system of a boiler. The sealing mechanism is driven by the operation of the resistance mechanism, so that the sealing mechanism seals the filtering mechanism tightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with 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 A schematic diagram of the connection structure of the main path mechanism and the bypass mechanism of the present invention;

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

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

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

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

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

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

[0035] Fig. 9 It is a schematic diagram of the connection structure between the interference spring and the clamping block of the present invention;

[0036] Fig.10 It is a schematic diagram of the connection structure between the pressing plate and the air storage bag of the present invention.

[0037] In the figure: 1. boiler; 2. main mechanism; 201. first conveying pipe; 202. steam turbine; 203. exhaust isolation valve; 204. high pressure heater; 205. air preheater; 206. second hot air pipe; 207. first hot air pipe; 208. coal mill; 3. bypass mechanism; 301. second conveying pipe; 302. steam isolation valve; 303. pressure reducing regulating valve; 304. desuperheater; 305. hot air heat exchanger; 306. warm water isolation valve; 307. warm water regulating valve; 4. filtering mechanism; 401. fixing frame; 402, mounting plate; 403, filter cotton; 404, slot; 405, rubber pad; 5, driving mechanism; 501, nut; 502, gear; 503, rack; 504, rotating shaft; 505, pulley; 506, transmission belt; 6, limiting mechanism; 601, block; 602, resistance spring; 7, resistance mechanism; 701, screw; 702, pressure plate; 703, push rod; 704, reset spring; 705, driving groove; 8, sealing mechanism; 801, sealing pad; 802, air storage bag; 803, connecting pipe. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] like Figure 1 , Figure 2 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the present invention discloses a drying device for a low-load powder making system of a boiler using main steam, comprising a boiler 1, to which a main path mechanism 2 is connected, to which a bypass mechanism 3 is also connected, to which a filtering mechanism 4 is installed, to which a driving mechanism 5 is installed, to which a limiting mechanism 6 is installed, to which a resistance mechanism 7 is installed, and to which a sealing mechanism 8 is installed.

[0040] Specifically, Figure 1As shown, the main mechanism 2 includes a steam turbine 202, a steam turbine 202 is installed on one side of the boiler 1, and the steam turbine 202 is connected to the boiler 1 through 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 through 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 through the first conveying pipe 201 and the exhaust isolation valve 203, and the high-pressure heater 204 is connected to the boiler 1 through the first conveying pipe 201, and 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 through a second hot air pipe 206, and the air preheater 205 is connected to the coal mill 208 through a first hot air pipe 207, and the combustion of the boiler 1 The steam is made to enter the steam turbine 202 for combustion, thereby realizing kinetic energy conversion. Meanwhile, a part of the steam is extracted from the steam turbine 202 by controlling the exhaust isolation valve 203 to enter the high-pressure heater 204 to heat the water, so that the heated water can enter the boiler 1, so that the waste heat is reused, thereby reducing the energy consumption of the boiler 1 and improving the water boiling efficiency. The cold air is preheated by the air preheater 205 and transported to the boiler 1 through the second hot air pipe 206, so that the boiler 1 burns fully. Meanwhile, a part of the hot air from the air preheater 205 is transported to the coal mill 208 through the first hot air pipe 207, which is beneficial 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 enter the boiler 1 again for combustion, thereby greatly saving energy consumption and increasing the overall efficiency.

[0041] Specifically, 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 connected to a pressure reducing regulating valve 303 and a steam isolating valve 302 in sequence through a second delivery pipe 301, the steam isolating valve 302 is connected to the boiler 1 through the second delivery pipe 301, one side of the desuperheater 304 is connected to a warm water regulating valve 307 and a warm water isolating valve 306 in sequence through the second delivery pipe 301, the other end of the desuperheater 304 is connected to a hot air heat exchanger 305 through the second delivery pipe 301, the hot air heat exchanger 305 is connected to the high pressure heater 204 through the second delivery pipe 301, the first hot air pipe 207 is connected to the coal mill 208 through the hot air heat exchanger 305, and the bypass steam output from the boiler 1 passes through the The steam isolation valve 302 enters the pressure reducing regulating valve 303 to reduce the pressure, and the steam after the pressure reduction enters the desuperheater 304. Through the cooperation of the warm water isolation valve 306, the warm water enters the warm water regulating valve 307 to adjust the flow and then enters the desuperheater 304, which is beneficial to cooling the steam in the desuperheater 304, and the steam after the pressure reduction and temperature reduction enters the hot air heat exchanger 305, so as to further heat the hot air in the first hot air pipe 207, and the heated air enters the coal mill 208 to further dry the coal powder, thereby improving the combustion intensity. At the same time, the steam after the temperature and pressure reduction finally enters the high-pressure heater 204 through the second delivery pipe 301 to heat the water and then send it to the boiler 1, which is beneficial to the reuse of the steam.

[0042] Specifically, Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the filtering mechanism 4 includes a fixing frame 401, and the fixing frame 401 is installed at one end of the air preheater 205. The fixing frame 401 is a frame-type structure. A slot 404 is provided on one side of the fixing frame 401. A mounting plate 402 is slidably connected inside the slot 404. A filter cotton 403 is installed at the center of the mounting plate 402. The installation of the fixing frame 401 facilitates the connection of the mounting plate 402. The filter cotton 403 on the mounting plate 402 facilitates the filtering of the incoming cold air to block debris and water vapor. In addition, the slot 404 is opened to enable the mounting plate 402 to be slidably assembled and disassembled with the fixing frame 401, so as to facilitate the subsequent replacement of the filter cotton 403.

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

[0044] Specifically, Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the driving mechanism 5 includes a rotating shaft 504, and the side walls at both ends of the fixing frame 401 are rotatably connected with the rotating shaft 504 respectively. Gears 502 are respectively installed at both ends of the two groups of the rotating shafts 504. The two groups of gears 502 are rotatably connected to the inside of the fixing frame 401 through the rotating shafts 504. The edges of the two groups of gears 502 extend to the inside of the slot 404 respectively. Racks 503 are fixedly connected to the top and bottom of both sides of the mounting plate 402 respectively. The multiple racks 503 are respectively meshed with the multiple gears 502. The top of one of the rotating shafts 504 extends to the fixing frame On the outside of 401, a nut 501 is installed on the top of the rotating shaft 504. By installing two groups of the rotating shafts 504, the rotation connection of multiple groups of the gears 502 is realized. 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 nut 501 is driven by a wrench to control the rotation of the rotating shaft 504, and the gear 502 drives the rack 503 to move, thereby making the mounting plate 402 slide out or slide in, thereby realizing convenient disassembly and assembly of the mounting plate 402 and more labor-saving operation.

[0045] Specifically, Figure 7 and Figure 8 As shown, a pulley 505 is installed on the top of two of the rotating shafts 504, and the pulley 505 is rotatably connected to the inside of the fixed frame 401 through the rotating shaft 504. The two pulleys 505 are connected by a transmission belt 506. The pulley 505 is installed on the two rotating shafts 504 on the same side. With the cooperation of the transmission belt 506, the two rotating shafts 504 rotate synchronously, and then the two gears 502 synchronously drive the rack 503 to move, so that the mounting plate 402 can be smoothly disassembled and assembled.

[0046] Specifically, Figure 8 and Fig. 9As shown, the limiting mechanism 6 includes a clamping block 601, and a clamping block 601 is installed inside one end of the fixing frame 401. The clamping block 601 is slidably connected to the inside of the fixing frame 401 through a resistance spring 602. One end of the clamping block 601 is a toothed structure, and one end of the clamping block 601 is in resistance with one of the gears 502. Through the installation of the clamping block 601 and with the cooperation of the resistance spring 602, the clamping block 601 has telescopic sliding, and the clamping block 601 always keeps in resistance with the gear 502, playing a role of limiting the resistance of the gear 502. Since one end of the clamping block 601 is a toothed structure, when the gear 502 is rotated by a certain force, the gear 502 resists the clamping block 601, so that the clamping block 601 can be retracted, and then the gear 502 is rotated by a certain angle, which is conducive to the gear 502 not being easily loosened, so that the mounting plate 402 is stably installed and will not slip off.

[0047] Specifically, Figure 5 , Figure 8 and Fig.10 As shown, the interference mechanism 7 includes a push rod 703, a 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 through a reset spring 704, one end of the push rod 703 extends to one side of the block 601, the other end of the push rod 703 is a hemispherical structure, a pressure plate 702 is slidably connected to the inside of the fixing frame 401, the top of the pressure plate 702 is rotatably connected to a screw rod 701, the screw rod 701 extends to the outside of the top of the fixing frame 401, the screw rod 701 is threadedly connected to the fixing frame 401, a trapezoidal driving 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 When the driving groove 705 reaches the bottom, the push rod 703 is installed. Under the resistance of the reset spring 704, the push rod 703 is separated from the block 601, so that the block 601 can slide freely. By rotating the screw rod 701, the pressure plate 702 slides down under the action of the thread. The driving groove 705 on one side of the pressure plate 702 resists the push rod 703, so that the push rod 703 can slide away from the elastic force of the reset spring 704. The push rod 703 resists the block 601, and the block 601 cannot rotate, thereby stabilizing the gear 502 and firmly installing the mounting plate 402 inside the fixing frame 401.

[0048] Specifically, Figure 5 , Figure 8 and Fig.10As shown, the sealing mechanism 8 includes a sealing gasket 801, and sealing gaskets 801 are respectively installed on both sides of the inside of the slot 404. The sealing gasket 801 is a frame structure with a hollow interior. The sealing gasket 801 contacts 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 pressing plate 702. The bottom of the air storage bag 802 is connected to the two sealing gaskets 801 through a connecting tube 803. Through the installation of the sealing gasket 801, when the pressing plate 702 slides down and contacts the push rod 703, the air storage bag 802 is squeezed and deformed, so that the air inside the air storage bag 802 enters the inside of the sealing gasket 801, so that the sealing gasket 801 expands and contacts the rubber gasket 405 on the side wall of the mounting plate 402 tightly, so that the sealing is better.

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

[0050] S1: Main route: through the combustion of the boiler 1, steam is allowed to enter the steam turbine 202 to work, thereby realizing kinetic energy conversion. At the same time, by controlling the exhaust isolation valve 203, a part of steam is extracted from the steam turbine 202 to enter the high-pressure heater 204 to heat water, so that the heated water can enter the boiler 1, so that the waste heat is reused, reducing the energy consumption of the boiler 1 and improving the water boiling efficiency. In addition, the cold air is preheated by the air preheater 205 and transported to the boiler 1 through the second hot air pipe 206, so that the boiler 1 burns fully. At the same time, a part of the hot air from the air preheater 205 is transported 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 enter the boiler 1 again 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 to reduce the pressure, and the steam after the pressure reduction enters the desuperheater 304. Through the cooperation of the warm water isolation valve 306, the warm water enters the warm water regulating valve 307 to adjust the flow rate and then enters the desuperheater 304, which is beneficial to cool the steam in the desuperheater 304, so that the steam after pressure reduction and temperature reduction enters the hot air heat exchanger 305, thereby further heating the hot air in the first hot air pipe 207, and the heated air enters the coal mill 208 to further dry the coal powder, thereby improving the combustion intensity. At the same time, the steam after temperature reduction and pressure reduction finally enters the high-pressure heater 204 through the second delivery pipe 301 to heat the water and then is sent to the boiler 1, which is beneficial to the reuse of the steam;

[0052] S3: Then the filter mechanism 4 is inserted and installed with the main path mechanism 2, and then the driving mechanism 5 is rotated to stabilize the installation of the filter mechanism 4. By rotating the driving mechanism 5 in the opposite direction, the filter element of the filter mechanism 4 can be easily disassembled and maintained;

[0053] S4: Finally, the conflict mechanism 7 is manipulated to conflict with the limiting mechanism 6, so that the limiting mechanism 6 limits the driving mechanism 5, so that the filter mechanism 4 is stably installed. At the same time, the conflict mechanism 7 controls the sealing mechanism 8 to work, thereby sealing the filter mechanism 4 tightly.

[0054] When the present invention is in use, through the combustion of the boiler 1, the steam enters the steam turbine 202 to work, thereby realizing kinetic energy conversion, and at the same time, by controlling the exhaust isolation valve 203, a part of the steam is extracted from the steam turbine 202 to enter the high-pressure heater 204 to heat the water, so that the heated water can enter the boiler 1, so that the waste heat is reused, the energy consumption of the boiler 1 is reduced, and the water heating efficiency is improved. In addition, the cold air is preheated by the air preheater 205 and transported to the boiler 1 through the second hot air pipe 206, so that the boiler 1 burns fully. At the same time, a part of the hot air from the air preheater 205 is transported to the coal mill 208 through the first hot air pipe 207, which is beneficial to the drying of the coal powder and increases the combustion intensity of the coal powder. At this time, the hot air discharged from the coal mill 208 can enter the boiler 1 again. The combustion increases the heat in the boiler 1 and reduces the flame center, which is beneficial to the combustion in the boiler 1 and increases the overall efficiency. 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 steam after pressure reduction enters the desuperheater 304. Through the cooperation of the warm water isolation valve 306, the warm water enters the warm water regulating valve 307 to adjust the flow and then enters the desuperheater 304, which is beneficial to cool the steam in the desuperheater 304. The steam after pressure reduction and temperature reduction enters the hot air heat exchanger 305, thereby further heating the hot air in the first hot air pipe 207, and the heated air enters the coal mill 208 to further dry the coal powder, thereby improving the combustion intensity. At the same time, the steam after temperature reduction and pressure reduction finally passes through the The second delivery pipe 301 enters the high-pressure heater 204 to heat the water and then sends it to the boiler 1, which is beneficial to the reuse of steam. The installation of the fixing frame 401 is beneficial to the connection with the mounting plate 402. The filter cotton 403 on the mounting plate 402 is beneficial to filtering the incoming cold air to block the debris and water vapor. The slot 404 is opened to enable the mounting plate 402 to be slidably disassembled and assembled with the fixing frame 401, which is convenient for the subsequent replacement of the filter cotton 403. The installation of the rubber pad 405 is beneficial 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 pad 405 has elasticity and plays a role in sealing and stabilizing the installation of the mounting plate 402. The installation of two sets of rotating shafts 504 is realized. Now, multiple groups 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, the nut 501 is driven by a wrench to control the rotation of the rotating shaft 504, so that the gear 502 drives the rack 503 to move, and then the mounting plate 402 slides out or slides in, so that the mounting plate 402 can be conveniently disassembled and assembled, and the operation is more labor-saving. By installing a pulley 505 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, and then the two gears 502 synchronously drive the rack 503 to move, so that the mounting plate 402 can be smoothly disassembled and assembled. By installing the clamping block 601, with the cooperation of the resistance spring 602, the clamping block 601 has telescopic sliding.The block 601 always keeps in contact with the gear 502, which plays a role in limiting the contact of the gear 502. Since one end of the block 601 is a toothed structure, when the gear 502 rotates with a certain force, the gear 502 contacts the block 601, so that the block 601 can be contracted, and then the gear 502 is rotated by a certain angle, which is conducive to the gear 502 not being easy to loosen, so that the mounting plate 402 is stably installed and will not slip off. Through the installation of the push rod 703, under the resistance of the reset spring 704, the push rod 703 is separated from the block 601, which is convenient for the block 601 to slide freely. By rotating the screw rod 701, the pressure plate 702 is pressed under the action of the thread. 02 slides down, the driving groove 705 on one side of the pressure plate 702 contacts the push rod 703, so that the push rod 703 is free from the elastic force of the return spring 704 and slides, and the push rod 703 contacts the block 601, and the block 601 cannot rotate, thereby stabilizing the gear 502, and the mounting plate 402 is firmly installed inside the fixing frame 401. Through the installation of the sealing gasket 801, when the pressure plate 702 slides down and contacts the push rod 703, the air storage bag 802 is squeezed and deformed, so that the air inside the air storage bag 802 enters the sealing gasket 801, so that the sealing gasket 801 expands and contacts the rubber gasket 405 on the side wall of the mounting plate 402 tightly, so that the sealing is better.

[0055] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A drying device for a low-load pulverizing system using main steam to improve the boiler, characterized in that: The invention comprises a boiler (1), wherein the boiler (1) is connected to a main path mechanism (2), the boiler (1) is also connected to a bypass mechanism (3), the main path mechanism (2) is equipped with a filter mechanism (4), the filter mechanism (4) is equipped with a drive mechanism (5), the filter mechanism (4) is equipped with a limit mechanism (6), the filter mechanism (4) is equipped with a resistance mechanism (7), and the filter mechanism (4) is equipped with a sealing mechanism (8); The main circuit mechanism (2) comprises a steam turbine (202), the steam turbine (202) being installed on one side of the boiler (1), the steam turbine (202) being connected to the boiler (1) via a first delivery pipe (201), a coal mill (208) being installed on one side of the boiler (1), the coal mill (208) being connected to the boiler (1) via a first delivery pipe (201), a high-pressure heater (204) being installed on one side of the steam turbine (202), and the high-pressure heater (204) being connected to the boiler (1) via a first delivery pipe (201). 04) is connected to the steam turbine (202) through a first delivery pipe (201) and an air extraction isolation valve (203); the high-pressure heater (204) is connected to the boiler (1) through the first delivery 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 a second hot air pipe (206); and the air preheater (205) is connected to the coal mill (208) through a first hot air pipe (207); The bypass mechanism (3) comprises a desuperheater (304). The 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 regulating valve (303) and a steam isolating valve (302) via a second delivery pipe (301). The steam isolating valve (302) is connected to the boiler (1) via the second delivery pipe (301). One side of the desuperheater (304) is connected in sequence to a warm water regulating valve (307) and a warm water isolating valve (306) 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).

2. The drying device for a low-load pulverizing system using main steam to improve boiler performance according to claim 1, characterized in that: The filtering mechanism (4) comprises a fixing frame (401), one end of the air preheater (205) is mounted with the fixing frame (401), the fixing frame (401) is a frame-type structure, one side of the fixing frame (401) is provided with a slot (404), the inside of the slot (404) is slidably connected with a mounting plate (402), and a filter cotton (403) is mounted at the center of the mounting plate (402).

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

4. The drying device for a low-load pulverizing system using main steam to improve boiler performance according to claim 2, characterized in that: The driving mechanism (5) comprises a rotating shaft (504), and the side walls at both ends of the fixing frame (401) are rotatably connected with the rotating shafts (504), and gears (502) are respectively installed at both ends of the two groups of the rotating shafts (504). The two groups of gears (502) are rotatably connected to the inside of the fixing frame (401) through the rotating shafts (504), and the edges of the two groups of gears (502) extend to the inside of the slot (404), and the top and bottom of both sides of the mounting plate (402) are respectively fixedly connected with racks (503), and the plurality of racks (503) are respectively meshed with the plurality of gears (502), and the top of one of the rotating shafts (504) extends to the outside of the fixing frame (401), and a nut (501) is installed on the top of the rotating shaft (504).

5. The drying device for a low-load pulverizing system using main steam to improve boiler performance according to claim 4, characterized in that: A pulley (505) is installed on the top of each of the two rotating shafts (504). The pulley (505) is rotatably connected to the inside of the fixed frame (401) through the rotating shaft (504). The two pulleys (505) are connected via a transmission belt (506).

6. The drying device for a low-load pulverizing system using main steam to improve boiler performance according to claim 4, characterized in that: The limiting mechanism (6) comprises a clamping block (601), one end of the fixing frame (401) is internally mounted with the clamping block (601), the clamping block (601) is slidably connected to the inside of the fixing frame (401) via a resisting spring (602), one end of the clamping block (601) is a toothed structure, and one end of the clamping block (601) resists against one of the gears (502).

7. The drying device for a low-load pulverizing system using main steam to improve boiler performance according to claim 6, characterized in that: The interference mechanism (7) comprises a push rod (703), one end of the fixed frame (401) is internally installed with the push rod (703), 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 block (601), the other end of the push rod (703) is a hemispherical structure, the fixed frame (401) is slidably connected with a pressure plate (702), the top of the pressure plate (702) is rotatably connected with a screw rod (701), the screw rod (701) extends to the outside of the top of the fixed frame (401), the screw rod (701) is threadedly connected to the fixed frame (401), a trapezoidal driving 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 to the bottom of the driving groove (705).

8. The drying device for a low-load pulverizing system using main steam to improve boiler performance according to claim 1 or 7, characterized in that: The sealing mechanism (8) comprises a sealing pad (801), and sealing pads (801) are respectively installed on both sides of the inside of the slot (404), and the sealing pad (801) is a frame-shaped structure with a hollow interior. The sealing pad (801) contacts the rubber pad (405) on the side wall of the mounting plate (402), and an air storage bag (802) is installed at the bottom of the pressure plate (702), and the bottom of the air storage bag (802) is connected to the two sealing pads (801) through a connecting pipe (803).

9. A method for improving the drying device of a low-load pulverizing system of a boiler by using main steam according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Main path: When the boiler (1) is burning, steam enters the steam turbine (202) to work and realize kinetic energy conversion. At the same time, a part of the steam is extracted from the steam turbine (202) by controlling the exhaust isolation valve (203) to enter the high-pressure heater (204) to heat water, so that the heated water can enter the boiler (1). The air preheater (205) preheats the cold air and transmits it to the boiler (1) through the second hot air pipe (206), so that the boiler (1) can burn fully. At the same time, a part of the hot air from the air preheater (205) is transmitted 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 enter the boiler (1) again 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 steam after the pressure reduction enters the desuperheater (304). Through the cooperation of the warm water isolation valve (306), the warm water enters the warm water regulating valve (307) to adjust the flow rate and then enters the desuperheater (304). The steam after the pressure reduction and temperature reduction enters the hot air heat exchanger (305), thereby further heating the hot air in the first hot air pipe (207). The heated air enters the coal mill (208) to further dry the pulverized coal. At the same time, the steam after the temperature reduction and pressure reduction finally enters the high-pressure heater (204) through the second delivery pipe (301) to heat the water and then is sent to the boiler (1); S3: Then the filter mechanism (4) and the main path mechanism (2) are inserted and installed, and then the driving mechanism (5) is rotated to stabilize the installation of the filter mechanism (4), and the filter element of the filter mechanism (4) is disassembled and maintained by rotating the driving mechanism (5) in the opposite direction; S4: Finally, the conflict mechanism (7) is manipulated so that the conflict mechanism (7) conflicts with 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 conflict mechanism (7) controls the sealing mechanism (8) to work, thereby sealing the filter mechanism (4) tightly.

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