A flue gas treatment device for an industrial boiler

Abstract

The application relates to the technical field of heat exchangers, in particular to a flue gas treatment device of an industrial boiler, which comprises a cylinder body, sealing plates are connected to both ends of the cylinder body, a plurality of groups of horizontal heat exchange pipes are arranged between the two groups of sealing plates, an inlet flue shell and an exhaust flue shell are detachably connected to the two ends of the cylinder body, the inlet flue shell and the exhaust flue shell are communicated with the two ends of the heat exchange pipes respectively, and a liquid inlet shell is arranged at the bottom of the cylinder body. The flue gas temperature and the volume of the heat exchange area are dynamically and adaptively regulated, the higher the flue gas temperature is, the farther the distance between the adjusting plate and the inlet flue shell is, and the wider the volume of the heat exchange area is. The adjusting plate is driven to move by a temperature control driving assembly, so that the water body is always focused on the high-temperature section of the heat exchange pipe to absorb heat, the problems of insufficient water quantity of high-temperature flue gas and low heating efficiency of low-temperature flue gas caused by the fixed water storage space of the existing device are solved, and the flue gas heat recovery rate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to a flue gas treatment device of an industrial boiler. BACKGROUND

[0002] In the field of industrial production, industrial boilers, as important heat power equipment, are widely used in chemical industry, metallurgy, power and other industries. The flue gas generated during the operation of the industrial boiler is purified, and due to the fact that it still carries a certain amount of heat, in order to realize the recycling of energy, most enterprises will connect a heat exchange pipe device at the rear end of the flue gas purification system, which is usually used in cooperation with a water storage structure, and the heat of the purified flue gas is used to heat the water, and the heated water can be applied to multiple links of industrial production.

[0003] At present, the water storage space of the existing flue gas heat exchange device is usually fixed, and the total amount of water that can be contained in the inside is relatively fixed. When the industrial boiler is in different operating conditions, the temperature of the purified flue gas discharged will fluctuate greatly. When the boiler is in full load operation, the flue gas temperature is high, and the fixed amount of water can be quickly heated to the required temperature at this time. However, when the boiler is in a low load operation state, or the flue gas temperature is reduced due to production process adjustment, since the total amount of water in the water storage space does not change, the lower flue gas heat is difficult to heat a large amount of water to the preset temperature within an effective time, affecting the demand for hot water in subsequent production processes or domestic water, and the water flow and flue gas volume are difficult to quickly match, which easily causes the flue gas heat recovery efficiency and water heating efficiency to be reduced. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a flue gas treatment device of an industrial boiler to improve the recycling rate of flue gas heat.

[0005] The technical scheme adopted by the present application to solve its technical problems is a flue gas treatment device of an industrial boiler, which comprises a cylinder, both ends of the cylinder are connected with sealing plates, a plurality of groups of horizontal heat exchange pipes are arranged between the two groups of sealing plates, the two ends of the cylinder are detachably connected with an inlet smoke shell and an exhaust smoke shell, the inlet smoke shell and the exhaust smoke shell are communicated with the two ends of the heat exchange pipe, a liquid inlet shell is installed at the bottom of the cylinder, the bottom of the cylinder is communicated with the liquid inlet shell through a plurality of groups of liquid inlet holes distributed along the axial direction of the cylinder, a vertical adjusting plate is sealingly and slidingly connected in the cylinder, the heat exchange pipe passes through the adjusting plate and is sealingly and slidingly connected with the adjusting plate, a transmission structure for driving the adjusting plate to move is arranged on the adjusting plate, a temperature control driving assembly is arranged at one end of the cylinder close to the inlet smoke shell and is in transmission with the transmission structure, and a liquid outlet pipe is communicated with the top of the one end of the cylinder close to the inlet smoke shell.

[0006] Specific, the temperature control drive assembly includes fixedly connected to the arc-shaped piston cylinder of the sealing plate near the end of the smoke shell, the arc-shaped piston cylinder is sealingly and slidably connected with the piston plate, one side of the piston plate is fixedly connected with the piston rod, the output end of the piston rod penetrates the arc-shaped piston cylinder and is fixedly connected with the arc-shaped rack, the reset spring is fixedly connected between the piston plate and the inner wall of the arc-shaped piston cylinder, the fixed end of the arc-shaped piston cylinder is communicated with the liquid storage cylinder, the liquid storage cylinder is filled with thermal expansion fluid.

[0007] One side of the arc-shaped rack is engaged with the driving gear, the driving gear is connected with the driving shaft, one end of the driving shaft is connected with the sealing plate through the rotating seat, the variable speed gear is fixedly connected on the driving shaft, and the variable speed gear is engaged with the transmission structure.

[0008] Specific, the transmission structure includes a threaded hole arranged on the adjusting plate, the threaded hole is threadedly connected with a horizontally arranged screw rod, one end of the screw rod near the smoke shell penetrates the sealing plate and is rotatably connected with the sealing plate, the end of the screw rod is fixedly connected with the transmission gear, and the transmission gear is engaged with the variable speed gear.

[0009] Specific, the liquid inlet shell is communicated with the liquid discharge pipe at the lower part of the end near the smoke shell, the sealing ring is fixedly connected in the liquid discharge pipe, the sealing ring is provided with the sealing plate below, the lower surface of the sealing plate is fixedly connected with the extrusion spring, one end of the extrusion spring away from the sealing plate is fixedly connected with the supporting ring, the outer side of the supporting ring is fixedly connected with a plurality of groups of circumferentially distributed fixing rods, and the fixing rods are fixedly connected with the inner wall of the liquid discharge pipe.

[0010] The upper surface of the sealing plate is fixedly connected with the pressing assembly, and the pressing assembly is in extrusion contact with the adjusting plate.

[0011] Specific, the pressing assembly includes a liquid discharge hole arranged at the lower part of the end of the cylinder body near the smoke shell, the liquid discharge hole corresponds to the upper end of the liquid discharge pipe, the sealing column is slidably connected in the liquid discharge hole, the upper surface of the sealing column is provided with the extrusion surface corresponding to the adjusting plate, and the lower surface of the sealing column is fixedly connected with the upper surface of the sealing plate through the driving rod.

[0012] Specific, one end of the liquid storage cylinder is fixedly connected with one side of the sealing plate through the mounting bracket, and the outer side of the liquid storage cylinder is fixedly connected with a plurality of groups of heat-conducting fins.

[0013] Specific, the outer side of the cylinder body is fixedly connected with a plurality of groups of arc-shaped supports, the two ends of the arc-shaped supports are fixedly connected with the outer side of the liquid inlet shell through bolts, and the contact parts of the arc-shaped supports with the cylinder body and the liquid inlet shell are all provided with rubber damping pads.

[0014] Specific, the connection part of the smoke shell and the cylinder is provided with a flange plate, the flange plate is welded and fixed with the end of the smoke shell and the end of the cylinder respectively, and the high-temperature-resistant sealing gasket is clamped between the two groups of flange plates.

[0015] The beneficial effects of the present application are:

[0016] (1) The flue gas treatment device of the industrial boiler realizes dynamic self-adaptive regulation and control of flue gas temperature and heat exchange zone volume, the higher the flue gas temperature, the greater the distance between the adjusting plate and the smoke shell, and the wider the heat exchange zone volume, the water body is always focused on the high temperature section of the heat exchange pipe to absorb heat by driving the adjusting plate to move through the temperature control driving assembly, so as to solve the problems of insufficient water quantity of high temperature flue gas and low heating efficiency of low temperature flue gas caused by fixed water storage space of the existing device, and improve the flue gas heat recovery utilization rate.

[0017] (2) The flue gas treatment device of the industrial boiler integrates heating volume adjustment and heat exchange pipe scale removal functions, the adjusting plate can scrape the scale on the outer wall of the heat exchange pipe when moving back, and cooperates with the liquid inlet shell and the liquid discharge pipe to make the scraped impurities flow with the water body and then be discharged after sedimentation, so as to avoid the influence of scale covering on the heat exchange efficiency and reduce the maintenance frequency of the device.

[0018] (3) The flue gas treatment device of the industrial boiler, when the flue gas enters, the pressing assembly is decompressed, the sealing plate seals the liquid discharge pipe to ensure heating; when the flue gas stops, the adjusting plate extrudes the pressing assembly, the sealing plate moves down to open the liquid discharge pipe to discharge the water body and impurities, without manual operation, reducing operation and maintenance cost, and avoiding water leakage during heating. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in conjunction with the drawings and examples.

[0020] Figure 1 is the isometric view of the present application;

[0021] Figure 2 is the side view of the present application;

[0022] Figure 3 is the cross-sectional structure schematic diagram of the smoke shell of the present application;

[0023] Figure 4 is the A area enlarged view of Figure 3 ;

[0024] Figure 5 is the cross-sectional structure schematic diagram of the cylinder and liquid inlet shell part of the present application;

[0025] Figure 6 is the B area enlarged view of Figure 5 ;

[0026] Figure 7 is the C area enlarged view of Figure 5Enlarged view of region C;

[0027] Figure 8 This is a schematic cross-sectional view of the arc-shaped piston cylinder of the present invention;

[0028] In the diagram: 1. Cylinder; 2. Sealing plate; 3. Heat exchange tube; 4. Smoke inlet shell; 5. Smoke outlet shell; 6. Liquid inlet shell; 7. Liquid inlet hole; 8. Adjusting plate; 9. Arc-shaped piston cylinder; 10. Piston plate; 11. Piston rod; 12. Arc-shaped rack; 13. Return spring; 14. Liquid storage cylinder; 15. Drive gear; 16. Drive shaft; 17. Speed ​​change gear; 18. Threaded hole; 19. Screw; 20. Transmission gear; 21. Drain pipe; 22. Sealing ring; 23. Sealing plate; 24. Compression spring; 25. Support ring; 26. Fixing rod; 27. Drain hole; 28. Sealing column; 29. ​​Compression surface; 30. Drive rod; 31. Mounting bracket; 32. Heat-conducting fins; 33. Arc-shaped bracket; 34. Flange; 35. Liquid outlet pipe. Detailed Implementation

[0029] 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.

[0030] To improve the recovery and utilization rate of flue gas heat, as one embodiment of the present invention, such as Figures 1-3 As shown, the flue gas treatment device for an industrial boiler according to the present invention includes a cylindrical body 1. Both ends of the cylindrical body 1 are connected to sealing plates 2. Multiple sets of horizontal heat exchange tubes 3 are provided between the two sets of sealing plates 2. The two ends of the cylindrical body 1 are detachably connected to a flue gas inlet shell 4 and a flue gas outlet shell 5. The flue gas inlet shell 4 and the flue gas outlet shell 5 are respectively connected to the two ends of the heat exchange tubes 3. A liquid inlet shell 6 is installed at the bottom of the cylindrical body 1. The bottom of the cylindrical body 1 is connected to the liquid inlet shell 6 through a number of liquid inlet holes 7 distributed along the axial direction of the cylindrical body 1. A vertical adjusting plate 8 is slidably connected inside the cylindrical body 1. The heat exchange tubes 3 pass through the adjusting plate 8 and are slidably connected to the adjusting plate 8. The adjusting plate 8 is provided with a transmission structure for driving the adjusting plate 8 to move. A temperature control drive assembly that drives the transmission structure is provided at one end of the cylindrical body 1 near the flue gas inlet shell 4. A liquid outlet pipe 35 is connected above the end of the cylindrical body 1 near the flue gas inlet shell 4.

[0031] In use, the purified industrial boiler flue gas first enters the device through the flue gas inlet shell 4, and is evenly distributed to the interior of multiple sets of horizontal heat exchange tubes 3 through the connection interface between the flue gas inlet shell 4 and the heat exchange tube 3. As the flue gas flows axially along the heat exchange tube 3, the heat it carries is transferred to the water in the inner cavity of the cylinder 1 through the tube wall of the heat exchange tube 3, completing the initial transfer of heat from the flue gas to the water. The flue gas after the heat is released is discharged through the exhaust shell 5 at the other end of the cylinder 1.

[0032] The adjusting plate 8 divides the cylinder 1 into a heat exchange area close to the smoke inlet shell 4 and a normal temperature area close to the smoke outlet shell; since the smoke continuously releases heat when flowing in the heat exchange pipe 3, there is a significant temperature difference between the heat exchange area and the normal temperature area of the heat exchange pipe 3, the heat exchange area is close to the smoke inlet shell 4, the temperature of the smoke is the highest, and the water body can be quickly heated; on the contrary, the normal temperature area is close to the smoke outlet shell 5, the temperature of the smoke is significantly reduced after the heat is fully released along the way, and the water body temperature in the normal temperature area fluctuates less;

[0033] In the initial stage of the smoke entering the heat exchange pipe 3, the temperature control driving assembly drives the transmission structure to work under the influence of the temperature of the smoke, and the transmission structure drives the adjusting plate 8 to move along the heat exchange pipe 3 in the direction away from the smoke inlet shell 4, in this process, the distance between the adjusting plate 8 and the smoke inlet shell 4 gradually increases, so that the volume of the heat exchange area is simultaneously enlarged, and the number of the liquid inlet holes 7 connected with the heat exchange area is increased, so that the water inlet speed of the heat exchange area can be increased; the liquid inlet shell 6 injects water into the inner cavity of the cylinder 1 through the liquid inlet holes 7, and the water is discharged through the liquid outlet pipe 35 after the inner cavity of the cylinder 1 is filled with water, when the water is in the heat exchange area, the water can quickly absorb heat and be heated.

[0034] With the increase of the temperature of the smoke at the smoke inlet shell 4, the temperature control driving assembly further drives the adjusting plate 8 to move through the transmission structure, in this process, the heat exchange area is further enlarged, and the water inlet speed and the water storage capacity of the heat exchange area are increased, so that the water to be heated can be automatically adjusted according to the change of the temperature of the smoke, and the water heating efficiency and the smoke heat recovery efficiency are improved.

[0035] In order to supply heat according to the smoke and adjust the volume of the heat exchange area, as shown in Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 The temperature control driving assembly comprises an arc-shaped piston cylinder 9 fixedly connected to one end of the sealing plate 2 close to the smoke inlet shell 4, a piston plate 10 sealingly and slidably connected in the arc-shaped piston cylinder 9, a piston rod 11 fixedly connected to one side of the piston plate 10, an arc-shaped rack 12 fixedly connected to the output end of the piston rod 11 and penetrating through the arc-shaped piston cylinder 9, a reset spring 13 fixedly connected between the piston plate 10 and the inner wall of the arc-shaped piston cylinder 9, and a liquid storage cylinder 14 communicated with the fixed end of the arc-shaped piston cylinder 9 and filled with a thermal expansion fluid.

[0036] One side of the arc-shaped rack 12 is engaged with a driving gear 15, the driving gear 15 is connected with a driving shaft 16, one end of the driving shaft 16 is connected with the sealing plate 2 through a rotating seat, a variable speed gear 17 is fixedly connected to the driving shaft 16, and the variable speed gear 17 is engaged with the transmission structure.

[0037] In use, the purified flue gas enters the device through the smoke shell 4, the heat carried by the flue gas will immediately act on the liquid storage cylinder 14, the heat of the flue gas is transmitted to the inside of the liquid storage cylinder 14, the heat expansion fluid is triggered to expand by heat, the volume is increased synchronously with the temperature of the flue gas, the expanded heat expansion fluid enters the inside of the arc-shaped piston cylinder 9, extrudes the piston plate 10 to move, the piston plate 10 extrudes the reset spring 13 when moving, the piston plate 10 slides, synchronously drives the piston rod 11 to move, the arc-shaped rack 12 at the end of the piston rod 11 moves synchronously along the arc-shaped track with the piston rod 11, the arc-shaped rack 12 moves, the tooth surface thereof is meshed with the driving gear 15 to drive transmission, drives the driving gear 15 to rotate around its own axis, drives the variable speed gear 17 to rotate when the driving gear 15 rotates, relies on the meshing transmission between the variable speed gear 17 and the transmission structure to drive the adjusting plate 8 to move along the heat exchange pipe 3, after the flue gas enters, the adjusting plate 8 immediately moves away from the direction of the smoke shell 4, the volume of the heat exchange area in the cylinder body 1 close to the smoke shell 4 is synchronously expanded, and the heat supply brought by the flue gas is adapted;

[0038] If the temperature of the entering flue gas is higher, the expansion amount of the heat expansion fluid is larger, the sliding stroke of the piston plate 10 is longer, the moving distance of the arc-shaped rack 12 is farther, the rotation angle of the driving gear 15, the driving shaft 16 and the variable speed gear 17 is larger, the rotation number of the screw rod 19 is more, and the distance of the adjusting plate 8 away from the smoke shell 4 is larger, and the volume of the heat exchange area is further expanded; if the temperature of the flue gas is lower, the expansion amount of the heat expansion fluid is small, the sliding stroke of the piston plate 10 is short, the moving distance of the adjusting plate 8 is close, and the volume of the heat exchange area is only slightly expanded, so that the flue gas entering always drives the adjusting plate 8 to move, and the higher the temperature, the farther the movement is dynamically adapted;

[0039] When the flue gas stops entering or the temperature significantly decreases, the heat received by the liquid storage cylinder 14 decreases, the temperature of the heat expansion fluid decreases, the volume shrinks, the fluid pressure in the arc-shaped piston cylinder 9 decreases, at this time, the elastic force of the reset spring 13 is greater than the fluid thrust, the piston plate 10 is pushed to slide to the direction close to the liquid storage cylinder 14, the adjusting plate 8 is reset to the direction close to the smoke shell 4, the volume of the heat exchange area is reduced, and the initial state is returned, waiting for the next flue gas entering to trigger.

[0040] As shown in the examples of Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 The present application further comprises that the transmission structure comprises a threaded hole 18 arranged on the adjusting plate 8, a horizontally arranged screw rod 19 is threadedly connected in the threaded hole 18, one end of the screw rod 19 close to the smoke shell 4 penetrates through the sealing plate 2 and is rotationally connected with the sealing plate 2, a transmission gear 20 is fixedly connected at the end of the screw rod 19, and the transmission gear 20 is meshed with the variable speed gear 17 to drive transmission.

[0041] In use, when the high-temperature flue gas enters the device, the thermal expansion fluid of the temperature control driving assembly expands, drives the variable gear 17 to rotate through the arc-shaped rack 12 and the drive gear 15, the variable gear 17 synchronously rotates through the tooth surface engagement with the transmission gear 20, the screw rod 19 rotates along the axis thereof with the transmission gear 20, and the adjusting plate 8 is quickly moved in the axial direction away from the smoke inlet shell 4; the more the rotation number of the variable gear 17 is, the farther the distance between the adjusting plate 8 and the smoke inlet shell 4 is, and the larger the heat exchange area is, until the heat exchange area volume matches the heat supply of the high-temperature flue gas, and the rapid heating demand of a large amount of water body is met;

[0042] When the flue gas temperature decreases, the reset spring 13 of the temperature control driving assembly pushes the piston plate 10 to reset, drives the arc-shaped rack 12, the drive gear 15, the drive shaft 16, the variable gear 17 and the screw rod 19 to rotate reversely, pushes the adjusting plate 8 to slide in the axial direction towards the smoke inlet shell 4, the sliding distance of the adjusting plate 8 increases with the increase of the reverse rotation number of the screw rod 19, the heat exchange area volume is synchronously reduced, and the high-temperature section in front of the heat exchange pipe 3 is focused again, so that the heat of the low-temperature flue gas is not dispersed by the large-volume water body, and the water body can still be quickly heated.

[0043] As shown in Figure 1 , Figure 2 , Figure 5 , Figure 7 illustrated, the application further comprises that the liquid inlet shell 6 is connected with a liquid discharge pipe 21 at the lower part of one end close to the smoke inlet shell 4, the sealing ring 22 is fixedly connected in the liquid discharge pipe 21, the sealing plate 23 is arranged below the sealing ring 22, the extrusion spring 24 is fixedly connected to the lower surface of the sealing plate 23, the support ring 25 is fixedly connected to one end of the extrusion spring 24 away from the sealing plate 23, a plurality of groups of fixed rods 26 are fixedly connected to the outer side of the support ring 25, and the fixed rods 26 are fixedly connected with the inner wall of the liquid discharge pipe 21.

[0044] The upper surface of the sealing plate 23 is fixedly connected with a pressing assembly, and the pressing assembly is in extrusion contact with the adjusting plate 8.

[0045] In use, when the purified flue gas enters the device through the smoke inlet shell 4, the adjusting plate 8 is driven to move in the axial direction away from the smoke inlet shell 4 along the heat exchange pipe 3, before that, the adjusting plate 8 is in the initial position, the lower edge thereof is in extrusion contact with the pressing assembly, and the pressing assembly is in a pressure state, and as the adjusting plate 8 moves away from the smoke inlet shell 4, the extrusion force of the adjusting plate 8 on the pressing assembly gradually disappears; after the pressure of the pressing assembly is released, the extrusion spring 24 in the liquid discharge pipe 21 starts to reset, the sealing plate 23 slides in the axial direction upwards along the liquid discharge pipe 21, until the upper surface of the sealing plate 23 and the lower surface of the sealing ring 22 are attached, at this time, the flow channel of the liquid discharge pipe 21 is completely closed, and water body is prevented from leaking from the liquid discharge pipe 21 during subsequent water injection;

[0046] After the sealing of the drain pipe 21 is completed, the water body is connected to the liquid inlet shell 6, and the water body is uniformly injected into the inner cavity of the cylinder body 1 through the liquid inlet hole 7; when the flue gas flows in the heat exchange pipe 3, the heat is transferred to the water body in the cylinder body 1 through the pipe wall, and the water body in the heat exchange area is quickly heated and then discharged through the liquid outlet pipe 35, and enters the production or domestic water system;

[0047] When the boiler stops feeding smoke, the water valve of the liquid inlet shell 6 is closed synchronously, at this time the flue gas no longer transfers heat to the liquid storage cylinder 14, and finally drives the adjusting plate 8 to move axially to the direction of approaching the smoke inlet shell 4, during the resetting movement of the adjusting plate 8, the adjusting plate 8 will continuously slide and rub with the outer wall of the heat exchange pipe 3, the friction can scrape off the accumulated scale and impurities on the outer wall of the heat exchange pipe 3, avoiding the coverage of the impurities affecting the subsequent heat exchange efficiency, the impurities generated by scraping are collected in the direction of the liquid inlet hole 7 at the bottom of the cylinder body 1 along with the water body in the cylinder body 1; when the adjusting plate 8 moves to the smoke inlet shell 4, the volume of the heat exchange area gradually decreases, and the impurities in the heat exchange area flow into the liquid inlet shell 6 through the liquid inlet hole 7 at the bottom of the cylinder body 1, because the density of the impurities is much greater than that of the water body, the impurities will quickly settle to the bottom of the liquid inlet shell 6 under the action of gravity, and the relatively clean water body is located above the impurities;

[0048] When the adjusting plate 8 moves to the initial position, the lower edge again contacts the pressing assembly and generates a pressing force, the pressing assembly transmits the pressure to the sealing plate 23, after the sealing plate 23 is pressed downward, the elastic force of the extrusion spring 24 is overcome, the upper surface of the sealing plate 23 is separated from the sealing ring 22, and the flow-through channel of the drain pipe 21 is opened, at this time the extrusion spring 24 is further compressed, storing the resetting potential energy, waiting for the next flue gas to enter to trigger the sealing;

[0049] After the drain pipe 21 is opened, the water body in the liquid inlet shell 6 and the cylinder body 1, and the impurities at the bottom of the liquid inlet shell 6 are discharged downward along the drain pipe 21 at a high flow rate under the action of gravity and the water body itself pressure, the high-speed flowing water body forms a scouring, which can completely wrap and carry out the impurities accumulated at the bottom of the liquid inlet shell 6, avoiding the long-term accumulation of impurities in the liquid inlet shell 6 causing the liquid inlet hole 7 to be blocked, after the water body and the impurities are completely discharged, the adjusting plate 8 remains in the initial position, the extrusion spring 24 is continuously pressed, and the drain pipe 21 remains open until the next flue gas enters to trigger a new cycle;

[0050] When the boiler is started again, the flue gas reenters the device, the temperature control driving assembly drives the adjusting plate 8 away from the smoke inlet shell 4 again, the extrusion force of the adjusting plate 8 on the pressing assembly disappears, the extrusion spring 24 resets to push the sealing plate 23 to move upward to seal the drain pipe 21, the liquid inlet shell 6 is refilled with water, and the device enters the next cycle of heating, impurity removal and liquid discharge;

[0051] It should be noted that when the barrel 1 is filled with water, the water exerts a downward extrusion force on the sealing plate 23, at which time the compression spring 24 relies on its own preset elastic force to overcome the extrusion force, while pushing the sealing plate 23 to tightly adhere to the sealing ring 22, thereby ensuring the sealing effect of the drain pipe 21 and avoiding unintended leakage of water from the drain pipe 21.

[0052] As shown in Figure 5 , Figure 7 illustrated, the present application further comprises that the pressing assembly comprises a drain hole 27 arranged at the lower part of one end of the barrel 1 close to the smoke inlet shell 4, the drain hole 27 corresponds to the upper end of the drain pipe 21, a sealing column 28 is slidably connected in the drain hole 27, the upper surface of the sealing column 28 is provided with an extrusion surface 29 corresponding to the adjusting plate 8, and the lower surface of the sealing column 28 is fixedly connected with the upper surface of the sealing plate 23 through a driving rod 30.

[0053] In use, after the smoke is closed, the adjusting plate 8 is located at the initial position close to the smoke inlet shell 4, the edge thereof is in contact with and extrudes the extrusion surface 29 on the upper surface of the sealing column 28, the sealing column 28 is slid downward along the drain hole 27, the sealing plate 23 is driven downward synchronously by the sealing column 28 through the driving rod 30, the compression spring 24 is compressed, and the drain pipe 21 is opened.

[0054] When the smoke enters, the temperature control driving assembly drives the adjusting plate 8 to move away from the smoke inlet shell 4, the adjusting plate 8 is separated from the extrusion surface 29 of the sealing column 28, the compression spring 24 is reset to push the sealing plate 23 upward, the sealing column 28 is slid upward along the drain hole 27 by the sealing plate 23 through the driving rod 30, the sealing column 28 is in close contact with the inner wall of the drain hole 27 to achieve sealing, at the same time, the sealing plate 23 is in close contact with the sealing ring 22 in the drain pipe 21, the drain pipe 21 is closed, and water can be injected into the barrel 1 through the liquid inlet shell 6.

[0055] As shown in Figure 3 , Figure 8 illustrated, the present application further comprises that one end of the liquid storage cylinder 14 is fixedly connected with one side of the sealing plate 2 through a mounting bracket 31, and a plurality of groups of heat-conducting fins 32 are fixedly connected to the outer side of the liquid storage cylinder 14.

[0056] In use, the mounting bracket 31 can stably fix the liquid storage cylinder 14 on the sealing plate 2, avoiding the liquid storage cylinder 14 from shaking and deviating during operation of the device, and ensuring the stability of the communication between the liquid storage cylinder 14 and the arc-shaped piston cylinder 9; the heat-conducting fins 32 can increase the heat exchange area between the liquid storage cylinder 14 and the smoke, accelerate the transmission speed of the heat of the smoke to the heat-expandable fluid in the liquid storage cylinder 14, enable the temperature control driving assembly to quickly respond to the temperature change of the smoke, and improve the timeliness and accuracy of the position adjustment of the adjusting plate 8, thereby ensuring the heat recovery efficiency.

[0057] As shown in Figure 2As shown, the present application further comprises that the outer side of the barrel 1 is fixedly connected with several groups of arc-shaped supports 33, the two ends of the arc-shaped supports 33 are fixedly connected with the outer side of the liquid inlet shell 6 through bolts, and the contact parts of the arc-shaped supports 33 with the barrel 1 and the liquid inlet shell 6 are all provided with rubber shock-absorbing pads.

[0058] In use, the arc-shaped supports 33 connect the barrel 1 and the liquid inlet shell 6 through bolts, thereby enhancing the connection strength and improving the overall structural stability of the device; the rubber shock-absorbing pads at the contact parts can absorb the vibration generated during the operation of the device, reduce the noise, avoid the abrasion of the barrel 1 and the smoke inlet shell 4 caused by direct friction due to vibration, prolong the service life of the components, relieve the influence of vibration on other linkage components, and ensure the operation stability.

[0059] For example, Figure 2 As shown, the present application further comprises that the connection parts of the smoke inlet shell 4 and the barrel 1 are provided with flanges 34, the flanges 34 are respectively welded and fixed with the end parts of the smoke inlet shell 4 and the barrel 1, and a high-temperature-resistant sealing gasket is clamped between the two groups of flanges 34.

[0060] In use, the flanges 34 facilitate the disassembly and assembly of the smoke inlet shell 4 and the barrel 1, and the high-temperature-resistant sealing gasket can adapt to the high-temperature environment of flue gas, prevent the leakage of flue gas from the connection parts of the smoke inlet shell 4 and the barrel 1, avoid the heat loss affecting the heat exchange efficiency, ensure the operation safety, and prevent the pollution or safety hazards caused by the leakage of flue gas.

[0061] In use, the heat of flue gas is transferred to the thermal expansion fluid in the liquid storage cylinder 14 through the heat-conducting fins 32, the thermal expansion fluid is expanded by heat, the volume is increased synchronously with the temperature of flue gas, the expanded fluid enters the arc-shaped piston cylinder 9, the piston plate 10 is extruded to slide along the arc-shaped piston cylinder 9, the compression return spring 13 is compressed, the piston plate 10 drives the piston rod 11 and the arc-shaped rack 12 at the end to move along the arc-shaped track, the arc-shaped rack 12 is engaged with the driving gear 15 to drive the driving shaft 16 and the speed change gear 17 on the shaft to rotate; the speed change gear 17 is engaged with the transmission gear 20 to drive the screw rod 19 to rotate along the axis, the screw rod 19 pushes the adjusting plate 8 through the threaded holes 18 on the adjusting plate 8 to move along the heat exchange pipe 3 in the direction away from the smoke inlet shell 4.

[0062] During the movement of the adjusting plate 8, the volume of the heat exchange zone between the adjusting plate 8 and the smoke inlet shell 4 is synchronously increased, and the number of liquid inlet holes 7 connected with the heat exchange zone is increased; if the temperature of flue gas is high, the expansion amount of the thermal expansion fluid is larger, the sliding stroke of the piston plate 10, the moving distance of the arc-shaped rack 12, the rotation angle of the gear, and the rotation number of the screw rod 19 are all increased, the distance between the adjusting plate 8 and the smoke inlet shell 4 is larger, and the volume of the heat exchange zone is further increased to adapt to the heat supply of high-temperature flue gas; if the temperature of flue gas is low, the heat exchange zone is only slightly expanded to avoid the heat dispersion.

[0063] As the adjusting plate 8 moves away from the smoke inlet shell 4, the extrusion force of its lower edge on the pressing assembly gradually disappears, the extrusion spring 24 in the drain pipe 21 resets, pushing the sealing plate 23 to slide axially upward along the drain pipe 21 until the upper surface of the sealing plate 23 is in contact with the lower surface of the sealing ring 22 inside the drain pipe 21, completely sealing the flow passage of the drain pipe 21 and preventing subsequent water leakage;

[0064] The water body to be heated is connected to the liquid inlet shell 6, and the water body is uniformly injected into the heat exchange area of the inner cavity of the cylinder body 1 through the multiple groups of axial distribution liquid inlet holes 7 at the bottom of the cylinder body 1 until the cylinder body 1 is filled with water;

[0065] The flue gas flows axially in the heat exchange pipe 3, continuously releasing heat, which is transferred to the water body in the heat exchange area through the pipe wall of the heat exchange pipe 3, realizing the transfer of flue gas heat to the water body. The heated water body reaches the required temperature and is discharged from the liquid outlet pipe 35 above the end of the cylinder body 1 close to the smoke inlet shell 4, connected to the production or domestic water system, and the low-temperature flue gas after releasing heat is discharged through the smoke exhaust shell 5 at the other end of the cylinder body 1, completing a single flue gas heat exchange cycle;

[0066] As the temperature of the flue gas at the smoke inlet shell 4 increases, the temperature control driving assembly further drives the adjusting plate 8 to move through the transmission structure. In this process, the heat exchange area is further expanded, the water inlet speed and water storage capacity of the heat exchange area are increased, so as to automatically adjust the amount of water to be heated according to the change of flue gas temperature, improve the water heating efficiency and flue gas heat recovery efficiency;

[0067] When the industrial boiler stops running and stops feeding flue gas into the smoke inlet shell 4, the water injection valve of the liquid inlet shell 6 is closed synchronously, the liquid storage cylinder 14 no longer receives flue gas heat, the temperature of the thermal expansion fluid decreases, the volume shrinks, the fluid pressure in the arc-shaped piston cylinder 9 decreases, the elastic force of the reset spring 13 is greater than the fluid thrust, pushing the piston plate 10 to slide to the direction close to the liquid storage cylinder 14, the piston plate 10 resets the arc-shaped rack 12, the drive gear 15, the drive shaft 16, the variable speed gear 17 and the screw rod 19 to rotate in the opposite direction, pushing the adjusting plate 8 to reset along the heat exchange pipe 3 to the initial position close to the smoke inlet shell 4. During the sliding process of the adjusting plate 8, continuous sliding friction is generated between the adjusting plate 8 and the outer wall of the heat exchange pipe 3, which scrapes off the accumulated scale and impurities on the outer wall of the heat exchange pipe 3, avoiding the coverage of impurities affecting the subsequent heat exchange efficiency;

[0068] The impurities generated by scraping flow with the water body in the cylinder 1, and converge to the liquid inlet hole 7 at the bottom of the cylinder 1. When the adjusting plate 8 moves to the smoke inlet shell 4, the volume of the heat exchange area gradually decreases, and the impurities in the heat exchange area flow into the liquid inlet shell 6 through the liquid inlet hole 7 at the bottom of the cylinder 1. Since the density of the impurities is much greater than the density of the water body, the impurities will quickly settle to the bottom of the liquid inlet shell 6 under the action of gravity, and the relatively clean water body is located above the impurities. When the adjusting plate 8 returns to the initial position, the lower edge of the adjusting plate 8 again contacts the extrusion surface 29 of the sealing column 28 of the pressing assembly and generates an extrusion force. The sealing column 28 slides downward along the liquid outlet hole 27 at the lower part of the cylinder 1, and the sealing plate 23 is driven downward by the driving rod 30 to separate the upper surface of the sealing plate 23 from the sealing ring 22, open the flow passage of the liquid outlet pipe 21, and the residual water body in the cylinder 1 and the settled impurities at the bottom of the liquid inlet shell 6 are discharged downward along the liquid outlet pipe 21 at a high flow rate under the action of gravity and the water body itself pressure. The high-speed flowing water body forms a scouring, completely entrains and carries out the impurities accumulated at the bottom of the liquid inlet shell 6, and avoids the impurities from blocking the liquid inlet hole 7.

[0069] After the residual water body and the impurities are completely discharged, the adjusting plate 8 remains in the initial position, the pressing assembly is continuously pressed, the extrusion spring 24 is in a compressed state, and the liquid outlet pipe 21 remains in an open state. When the industrial boiler is started again, the purified flue gas is reconnected to the smoke inlet shell 4, the device automatically works, and enters the next round of flue gas treatment and heat recovery process.

[0070] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A flue gas treatment apparatus for an industrial boiler, characterized in that The utility model provides a heat exchange device, including the cylinder (1), both ends of cylinder (1) are connected with seal board (2), and multiple groups of horizontal heat exchange pipe (3) are equipped between two groups of seal board (2), and the both ends of cylinder (1) are detachably connected with the smoke shell (4) and the exhaust smoke shell (5), the smoke shell (4) and exhaust smoke shell (5) are communicated with the both ends of horizontal heat exchange pipe (3) respectively, the bottom of cylinder (1) is installed with the liquid inlet shell (6), and the bottom of cylinder (1) is communicated with liquid inlet shell (6) through several groups of along the axial distribution liquid inlet hole (7) of cylinder (1), and the inside seal sliding of cylinder (1) is connected with vertical adjusting plate (8), and horizontal heat exchange pipe (3) passes through adjusting plate (8) and is sealed with adjusting plate (8) sliding connection, and the adjusting plate (8) is equipped with transmission structure that drives adjusting plate (8) moves, and the one end of cylinder (1) near smoke shell (4) is equipped with temperature control drive assembly with transmission structure transmission, and the one end of cylinder (1) near smoke shell (4) is communicated with liquid outlet pipe (35) above; The temperature control drive assembly includes an arc-shaped piston cylinder (9) fixedly connected to the seal plate (2) at the end near the smoke shell (4), an arc-shaped piston plate (10) is sealingly and slidably connected in the arc-shaped piston cylinder (9), one side of the arc-shaped piston plate (10) is fixedly connected with a piston rod (11), an output end of the piston rod (11) penetrates through the arc-shaped piston cylinder (9) and is fixedly connected with an arc-shaped rack (12), a return spring (13) is fixedly connected between the arc-shaped piston plate (10) and the inner wall of the arc-shaped piston cylinder (9), and a liquid storage cylinder (14) is communicated with the fixed end of the arc-shaped piston cylinder (9), and the liquid storage cylinder (14) is filled with a thermal expansion fluid; One side of the arc-shaped rack (12) is engaged with a drive gear (15), the drive gear (15) is connected with a drive shaft (16), one end of the drive shaft (16) is connected with the seal plate (2) through a rotating seat, a variable speed gear (17) is fixedly connected to the drive shaft (16), and the variable speed gear (17) is engaged with the transmission structure. The transmission structure includes a threaded hole (18) arranged on the adjusting plate (8), a horizontally arranged screw rod (19) is threadedly connected in the threaded hole (18), one end of the screw rod (19) near the smoke shell (4) penetrates through the seal plate (2) and is rotatably connected with the seal plate (2), a transmission gear (20) is fixedly connected to the end of the screw rod (19), and the transmission gear (20) is engaged with the variable speed gear (17).

2. A flue gas treatment apparatus for an industrial boiler according to claim 1, characterized in that One end of the liquid inlet shell (6) near the smoke shell (4) is communicated with a liquid discharge pipe (21) at the lower part, a sealing ring (22) is fixedly connected in the liquid discharge pipe (21), an enclosing plate (23) is arranged in the sealing ring (22), a pressing spring (24) is fixedly connected to the lower surface of the enclosing plate (23), a supporting ring (25) is fixedly connected to one end of the pressing spring (24) away from the enclosing plate (23), a plurality of circumferentially distributed fixing rods (26) are fixedly connected to the outer side of the supporting ring (25), and the fixing rods (26) are fixedly connected with the inner wall of the liquid discharge pipe (21). The upper surface of the sealing plate (23) is fixedly connected with a pressing assembly, which is in extrusion contact with the adjusting plate (8).

3. A flue gas treatment apparatus for an industrial boiler according to claim 2, characterised in that The pressing assembly comprises a liquid discharge hole (27) arranged at the lower part of one end of the cylinder body (1) close to the smoke inlet shell (4), the liquid discharge hole (27) corresponds to the upper end of the liquid discharge pipe (21), a sealing column (28) is slidably connected in the liquid discharge hole (27), the upper surface of the sealing column (28) is provided with an extrusion surface (29) corresponding to the adjusting plate (8), and the lower surface of the sealing column (28) is fixedly connected with the upper surface of the sealing plate (23) through a driving rod (30).

4. A flue gas treatment apparatus for an industrial boiler according to claim 3, characterized in that One end of the liquid storage cylinder (14) is fixedly connected with one side of the sealing plate (2) through a mounting support (31), and the outer side of the liquid storage cylinder (14) is fixedly connected with a plurality of groups of heat-conducting fins (32).

5. A flue gas treatment apparatus for an industrial boiler according to claim 4, characterised in that The outer side of the cylinder body (1) is fixedly connected with a plurality of groups of arc-shaped supports (33), the two ends of the arc-shaped supports (33) are fixedly connected with the outer side of the liquid inlet shell (6) through bolts, and the contact parts of the arc-shaped supports (33) with the cylinder body (1) and the liquid inlet shell (6) are all provided with rubber damping pads.

6. A flue gas treatment apparatus for an industrial boiler according to claim 5, characterised in that The connecting part of the smoke inlet shell (4) and the cylinder body (1) is provided with a flange plate (34), the flange plate (34) is respectively welded and fixed with the end part of the smoke inlet shell (4) and the end part of the cylinder body (1), and a high-temperature-resistant sealing gasket is clamped between the two groups of flange plates (34).

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