A flue gas de - whiting and waste heat recovery device for coal - fired boilers

Abstract

The present invention relates to the technical field of boiler energy conservation and environmental protection, and particularly relates to a flue gas de - whitening and waste heat recovery device for a coal - fired boiler, which includes a regeneration tower, a desulfurization tower, and an absorption tower. One side of the regeneration tower is fixedly connected with an air - guiding sleeve, a rotating shaft is rotatably connected inside the air - guiding sleeve, and a plurality of blades and cams are fixedly connected to the rotating shaft. A cavity is formed inside the regeneration tower, a horizontal plate and an inclined plate are fixedly connected inside the cavity, inclined tubes are fixedly connected to the horizontal plate and the inclined plate, a hollow floating plate is slidably arranged inside the cavity, and a sliding assembly is arranged on the regeneration tower; the desulfurization tower is connected to the regeneration tower and the absorption tower respectively through two connecting pipes, and a supplementary tank is fixedly connected to one side of the regeneration tower. The present invention can ensure that water vapor condensation does not occur, achieve flue gas de - whitening, and when the flue gas is discharged after being treated, a large amount of fog plumes will not be formed, and the treatment effect on the flue gas is good, which is beneficial to the treatment of flue gas.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler energy conservation and environmental protection, and particularly relates to a flue gas de - whitening and waste heat recovery device for a coal - fired boiler. Background Art

[0002] With the continuous development of society and the continuous progress of technology, the technologies related to boiler energy conservation and environmental protection are also constantly improving. At present, during the use of coal - fired boilers, a large amount of flue gas is generated. In order to prevent the direct emission of flue gas from polluting the environment, the discharged flue gas is generally treated before being discharged.

[0003] At present, after the flue gas generated by the use of a coal - fired boiler is treated by a device, when the high - temperature flue gas is discharged, there is still a large amount of water vapor mixed in it. When the high - temperature flue gas is discharged into a lower - temperature environment, the hot water vapor quickly condenses into small water droplets or small ice crystals when it meets the cold. These tiny droplets or ice crystals gather together to form a visible fog plume, resulting in poor treatment effect of the flue gas and being unfavorable for the treatment of the flue gas. Summary of the Invention

[0004] The purpose of the present invention is to solve the following disadvantages in the prior art: After the flue gas generated by the use of a coal - fired boiler is treated by a device, when the high - temperature flue gas is discharged, there is still a large amount of water vapor mixed in it. When the high - temperature flue gas is discharged into a lower - temperature environment, the hot water vapor quickly condenses into small water droplets or small ice crystals when it meets the cold. These tiny droplets or ice crystals gather together to form a visible fog plume, resulting in poor treatment effect of the flue gas and being unfavorable for the treatment of the flue gas. Therefore, a flue gas de - whitening and waste heat recovery device for a coal - fired boiler is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A flue gas de - whitening and waste heat recovery device for a coal - fired boiler includes a regeneration tower, a desulfurization tower, and an absorption tower. A draft fan sleeve is fixedly connected to one side of the regeneration tower. A rotating shaft is rotatably connected inside the draft fan sleeve. A plurality of blades and cams are fixedly connected to the rotating shaft. A cavity is formed inside the regeneration tower. A horizontal plate and an inclined plate are fixedly connected inside the cavity. Inclined tubes are fixedly connected to the horizontal plate and the inclined plate. A hollow floating plate is slidably arranged inside the cavity. A sliding component is arranged on the regeneration tower;

[0007] The desulfurization tower is connected to the regeneration tower and the absorption tower respectively through two connecting pipes. A replenishment tank is fixedly connected to one side of the regeneration tower. The replenishment tank is connected to the regeneration tower through a replenishment pipe. Lithium bromide solution is filled at the bottom of the regeneration tower and inside the replenishment tank;

[0008] The absorption tower is connected to a fixed box through an exhaust pipe. A partition plate and a discharge pipe, both with a T-shaped cross-section, are fixedly connected inside the fixed box. A drying assembly is slidably arranged on the partition plate. The drying assembly includes two drying boxes. A filter cloth is fixedly connected to the bottom of each drying box. Calcium oxide is filled in the drying boxes. A rotating assembly is arranged on the fixed box.

[0009] As a preferred solution, the rotating assembly includes a rotating block installed on the back of the fixed box through a first torsion spring. The cross-section of the rotating block is T-shaped. Two sliding openings are formed on the back of the fixed box. A sliding bar is slidably arranged in each sliding opening. Each sliding bar is slidably connected to the rotating block. The backs of the two drying boxes are respectively clamped to the two sliding bars. An iron sheet is fixedly connected to the rotating block.

[0010] As a preferred solution, a first shunt rod is connected to the regeneration tower through a second torsion spring. One side of the regeneration tower is connected to a pressing plate through a first spring. The pressing plate is connected to the first shunt rod through a first pull rope.

[0011] As a preferred solution, a second shunt rod is rotatably connected inside the absorption tower. Transmission wheels and a plurality of spray heads are fixedly connected to both the second shunt rod and the first shunt rod. The two transmission wheels are connected by a transmission belt.

[0012] As a preferred solution, a first suction pump and a processing housing are fixedly connected to the regeneration tower. The first suction pump is connected to the first shunt rod through a first hose. Second suction pumps are fixedly connected to both the processing housing and the absorption tower. One of the second suction pumps is connected to the second shunt rod through a second hose.

[0013] As a preferred solution, a coil pipe and a heating pipe network are fixedly arranged inside the absorption tower. An L-shaped bracket is fixedly connected to one side of the regeneration tower. An airbag is fixedly connected to the L-shaped bracket. An air outlet and an air inlet are formed on the airbag. Check valves are installed in both the air outlet and the air inlet. A fixed pipe is fixedly connected to the airbag. A sealing cavity is formed inside the fixed box. The fixed pipe communicates with the sealing cavity. A sealing plate is slidably arranged in the sealing cavity. A bent rod is fixedly connected to the sealing plate. A second spring is sleeved on the bent rod. One end of the second spring is fixedly connected to the bent rod, and the other end of the second spring is fixedly connected to the fixed box. A vertical plate is fixedly connected to the bent rod. A plurality of magnets arranged at equal intervals are fixedly connected to the vertical plate.

[0014] As a preferred solution, an air outlet is provided on the fixed box. A sliding rod with an inverted T-shaped cross-section is inserted into the air outlet. A sealing ring and a limiting piece are fixedly connected to the sliding rod. The surface of the sealing ring fits against the inner wall of the air outlet. The sliding rod is connected to the sealing plate through a second pull rope.

[0015] As a preferred solution, a rectangular cavity is provided on one inner wall of the cavity. A drain pipe is fixedly connected to one inner wall of the rectangular cavity. Through holes are provided on the upper and lower inner walls of the rectangular cavity. The sliding assembly includes a cross-shaped block slidably installed in the through holes. A plurality of elastic pieces are fixedly connected to the cross-shaped block. Each elastic piece fits against the inner wall of the through hole. A connection hole is provided on the cross-shaped block. One end of the replenishing pipe fits against the surface of the cross-shaped block.

[0016] As a preferred solution, the cross-shaped block is connected to the hollow floating plate through a third pull rope. The rectangular cavity communicates with the cavity.

[0017] As a preferred solution, a round rod is rotatably connected to one side of the regeneration tower. The surface of the first pull rope fits against the surface of the round rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] During the spraying process of the lithium bromide solution inside the absorption tower, the lithium bromide solution can also heat the liquid inside the coil through heat transfer, effectively realizing waste heat recovery. The flue gas passes through the calcium oxide and filter cloth inside the two drying boxes. The calcium oxide can preferably absorb the water vapor in the flue gas. After the flue gas is discharged from the discharge pipe, it is pumped to the chimney by the booster pump and discharged. Since the flue gas is relatively dry, when it mixes with the air in the external environment, it can ensure that no water vapor condensation occurs, realizing the whitening of the flue gas. When the flue gas is discharged after being treated, no large amount of fog plume will be formed, and the treatment effect on the flue gas is better, which is beneficial to the treatment of the flue gas;

[0020] When the magnets arranged at equal intervals on the vertical plate move downward, the two drying boxes can move back and forth frequently. A plurality of vertical rods can be fixedly arranged inside the fixed box, and the lower ends of the plurality of vertical rods are respectively inserted into the drying boxes. During the back-and-forth movement of the two drying boxes, the calcium oxide powder inside them will move relative to the vertical rods, thereby realizing the stirring treatment of the calcium oxide, facilitating the better contact between the calcium oxide powder and the water vapor, better removing the water vapor in the flue gas, reducing the humidity of the flue gas, and achieving a better effect of whitening the flue gas;

[0021] The second diversion rod reciprocates back and forth along with the first diversion rod. During the process that each spray head reciprocates back and forth along with the first diversion rod and the second diversion rod respectively, the lithium bromide solution can be sprayed into the flue gas better and more fully, enabling the flue gas to come into full contact with the lithium bromide solution, so as to remove dust, a large number of impurity ions, etc. in the flue gas more thoroughly, achieving a better treatment effect on the flue gas and facilitating the subsequent emission of the flue gas.

[0022] During the process that the hollow floating plate moves up and down inside the cavity, the up and down movement of the cross block can be realized, making the connecting hole stagger or align with the liquid discharge pipe and the replenishing pipe, and the automatic replacement of the lithium bromide solution inside the cavity can be realized, so as to facilitate the multiple automatic addition of the purified lithium bromide solution, which is beneficial for the lithium bromide solution to better remove impurities such as dust in the flue gas. Brief Description of the Drawings

[0023] Figure 1 It is a front structural schematic diagram of a coal-fired boiler flue gas dewhiting and waste heat recovery device proposed by the present invention;

[0024] Figure 2 It is a front internal structural schematic diagram of a coal-fired boiler flue gas dewhiting and waste heat recovery device proposed by the present invention;

[0025] Figure 3 It is a front partial internal structural schematic diagram of a coal-fired boiler flue gas dewhiting and waste heat recovery device proposed by the present invention;

[0026] Figure 4 It is a side structural schematic diagram of a coal-fired boiler flue gas dewhiting and waste heat recovery device proposed by the present invention;

[0027] Figure 5 It is a back structural schematic diagram of a coal-fired boiler flue gas dewhiting and waste heat recovery device proposed by the present invention;

[0028] Figure 6 It is a front partial structural schematic diagram of the cross block and the liquid discharge pipe in the present invention;

[0029] Figure 7 It is a front internal structural schematic diagram of the fixed box in the present invention;

[0030] Figure 8 It is a top view partial structural schematic diagram of the fixed box in the present invention;

[0031] Figure 9 It is Figure 4 a partial enlarged structural schematic diagram of A in;

[0032] Figure 10 It is Figure 2 a partial enlarged structural schematic diagram of B in.

[0033] In the figure: 1 regeneration tower, 2 desulfurization tower, 3 absorption tower, 4 replenishment tank, 5 extrusion plate, 6 round rod, 7 first pull rope, 8 replenishment pipe, 9 second torsion spring, 10 first shunt rod, 11 second shunt rod, 12 conveyor belt, 13 vertical plate, 14 bent rod, 15 sliding rod, 16 discharge pipe, 17 inclined pipe, 18 hollow floating plate, 19 inclined plate, 20 spray head, 21 coil pipe, 22 horizontal plate, 23 drying box, 24 sealing plate, 25 second pull rope, 26 limiting piece, 27 airbag, 28 second pump, 29 treatment housing, 30 rotating block, 31 air guiding sleeve, 32 cam, 33 rotating shaft, 34 liquid discharge pipe, 35 elastic piece, 36 cross-shaped block, 37 third pull rope, 38 connecting hole, 39 first spring, 40 blade, 41 partition plate, 42 sealing ring, 43 fixed box, 44 slide bar, 45 iron sheet. Specific implementation manner

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] Refer to Figures 1-10 , a flue gas de - whitening and waste heat recovery device for a coal - fired boiler, including a regeneration tower 1, a desulfurization tower 2 and an absorption tower 3. A third pump is installed on the absorption tower 3. One side of the regeneration tower 1 is fixedly connected with an air guiding sleeve 31. A rotating shaft 33 is rotatably connected in the air guiding sleeve 31. A plurality of blades 40 and a cam 32 are fixedly connected to the rotating shaft 33. A cavity is provided in the regeneration tower 1. A horizontal plate 22 and an inclined plate 19 are fixedly connected in the cavity. Inclined pipes 17 are fixedly connected to the horizontal plate 22 and the inclined plate 19. A hollow floating plate 18 is slidably arranged in the cavity. A sliding assembly is arranged on the regeneration tower 1. The desulfurization tower 2 is connected to the regeneration tower 1 and the absorption tower 3 respectively through two connecting pipes. One side of the regeneration tower 1 is fixedly connected with a replenishment tank 4. The replenishment tank 4 is connected to the regeneration tower 1 through a replenishment pipe 8. Lithium bromide solution is filled in the bottom of the regeneration tower 1 and the replenishment tank 4.

[0036] The absorption tower 3 is connected with a fixed box 43 through an exhaust pipe. A partition plate 41 and a discharge pipe 16 with a T - shaped cross - section are fixedly connected in the fixed box 43. A drying assembly is slidably arranged on the partition plate 41. The drying assembly includes two drying boxes 23. A filter cloth is fixedly connected to the bottom of each drying box 23. Calcium oxide is filled in the drying box 23. The calcium oxide cannot penetrate through the filter cloth. A rotating assembly is arranged on the fixed box 43.

[0037] The rotating assembly includes a rotating block 30 mounted on the back of the fixed box 43 through a first torsion spring. The cross-section of the rotating block 30 is T-shaped. Two sliding openings are formed in the back of the fixed box 43. A slide bar 44 is slidably arranged in each sliding opening. Each slide bar 44 is slidably connected to the rotating block 30. The backs of the two drying boxes 23 are respectively clamped with the two slide bars 44. An iron sheet 45 is fixedly connected to the rotating block 30. A first shunt rod 10 is connected to the regeneration tower 1 through a second torsion spring 9. One side of the regeneration tower 1 is connected with a pressing plate 5 through a first spring 39. The pressing plate 5 is connected to the first shunt rod 10 through a first pull rope 7. A second shunt rod 11 is rotatably connected in the absorption tower 3. Transmission wheels and a plurality of spray heads 20 are fixedly connected to both the second shunt rod 11 and the first shunt rod 10.

[0038] The two transmission wheels are connected by a transmission belt 12. A first pump and a processing housing 29 are fixedly connected to the regeneration tower 1. The first pump is connected to the first shunt rod 10 through a first hose. Second pumps 28 are fixedly connected to both the processing housing 29 and the absorption tower 3. One of the second pumps 28 is connected to the second shunt rod 11 through a second hose. A round rod 6 is rotatably connected to one side of the regeneration tower 1. The surface of the first pull rope 7 is in contact with the surface of the round rod 6. During the rotation of the cam 32, one end of the cam 32 will repeatedly press against and disengage from the pressing plate 5, so that the pressing plate 5 moves back and forth repeatedly. When the pressing plate 5 is pressed, it will slide relative to the regeneration tower 1. A sliding groove for the forward and backward movement of the pressing plate 5 is formed on one side of the regeneration tower 1. Since the two ends of the first spring 39 are respectively fixedly connected to the pressing plate 5 and the regeneration tower 1, the first spring 39 is deformed.

[0039] Since one end of the inelastic first pull rope 7 is fixedly connected to the pressing plate 5 and the other end is wound around the first shunt rod 10 and cannot be detached, and the first pull rope 7 is in close contact with the surface of the round rod 6, the first pull rope 7 will be pulled during the movement of the pressing plate 5. Under the driving action of the first pull rope 7, the first shunt rod 10 rotates simultaneously. Since one end of the second torsion spring 9 is fixedly connected to the first shunt rod 10 and the other end is fixedly connected to the side surface of the regeneration tower 1, the second torsion spring 9 is deformed. When the pressing plate 5 returns to the initial position, under the elastic force of the second torsion spring 9, the first shunt rod 10 will rotate back to the initial position. During the back-and-forth movement of the pressing plate 5, the first shunt rod 10 can be deflected back and forth. Under the combined driving action of the two transmission wheels and the transmission belt 12, the second shunt rod 11 will also reciprocate back and forth with the first shunt rod 10. During the back-and-forth deflection of each spray head 20 with the first shunt rod 10 and the second shunt rod 11 respectively, the lithium bromide solution can be sprayed onto the flue gas better and more fully, so that the flue gas is in full contact with the lithium bromide solution, so as to better remove dust, a large number of impurity ions, etc. in the flue gas, and the treatment effect on the flue gas is better, so as to facilitate the subsequent emission of the flue gas.

[0040] Inside the absorption tower 3, a coil pipe 21 and a heat supply pipe network are fixedly arranged. On one side of the regeneration tower 1, an L-shaped bracket is fixedly connected. An airbag 27 is fixedly connected to the L-shaped bracket. An air outlet and an air inlet are formed in the airbag 27. Check valves are installed in both the air outlet and the air inlet. A fixed pipe is fixedly connected to the airbag 27. A sealing cavity is formed in a fixed box 43. The fixed pipe communicates with the sealing cavity. A sealing plate 24 is slidably arranged in the sealing cavity. A bent rod 14 is fixedly connected to the sealing plate 24. A second spring is sleeved on the bent rod 14. One end of the second spring is fixedly connected to the bent rod 14, and the other end of the second spring is fixedly connected to the fixed box 43. A vertical plate 13 is fixedly connected to the bent rod 14. A plurality of magnets arranged at equal intervals are fixedly connected to the vertical plate 13. During the rotation of the cam 32, the airbag 27 will be squeezed and separated multiple times. Only one side surface of the airbag 27 is fixedly connected to the L-shaped bracket, and the check valve can effectively prevent the gas inside the fixed pipe from flowing back into the airbag 27. External air can enter the airbag 27 through the air inlet. Since the two ends of the fixed pipe are respectively fixedly connected to the airbag 27 and the fixed box 43.

[0041] Each time the airbag 27 is squeezed by the squeezing plate 5, the air inside it will be discharged into the sealing cavity through the fixed pipe. Since the sealing performance is good when the sealing plate 24 is connected to the sealing cavity, the air will push the sealing plate 24 to move downward in the sealing cavity. The bent rod 14 simultaneously slides relative to the fixed box 43 and the connection sealing performance is good. The second spring deforms. During the process of the vertical plate 13 moving downward together with the bent rod 14, a plurality of magnets (not shown) arranged vertically at equal intervals on the vertical plate 13 will successively fit and separate from the iron sheet 45. When each magnet fits with the iron sheet 45 and moves downward, under the action of the attraction force, the iron sheet 45 will also deflect downward together. The rotating block 30 simultaneously rotates relative to the fixed box 43.

[0042] Since one end of the first torsion spring (not shown) is fixedly connected to the rotating block 30 and the other end of the first torsion spring is fixedly connected to the fixed box 43, the first torsion spring is deformed. Since one end of each slide bar 44 is slidably arranged on the rotating block 30 and slides in the corresponding slide opening, and the end of the slide bar 44 passing through the slide opening is clamped with the drying box 23, during the rotation of the rotating block 30, under the transmission of the slide bar 44, the two drying boxes 23 will slide along the slide opening. When the iron sheet 45 is not in contact with the magnet and there is a large distance and it is completely located between two adjacent magnets, the rotating block 30 will rotate back under the elastic force of the first torsion spring. Repeating the above process can make the two drying boxes 23 move back and forth frequently. A plurality of vertical rods can be fixedly arranged in the fixed box 43, and the lower ends of the plurality of vertical rods are respectively inserted into the drying box 23. During the back-and-forth movement of the two drying boxes 23, the calcium oxide powder inside them will move relative to the vertical rods, thereby realizing the stirring treatment of calcium oxide, facilitating the better contact of calcium oxide powder with water vapor, better removing the water vapor in the flue gas, reducing the humidity of the flue gas, and achieving a better effect of flue gas dewhiting.

[0043] An air outlet hole is formed in the fixed box 43, and a slide bar 15 with an inverted T-shaped cross-section is inserted into the air outlet hole. An expansion rod can be fixedly installed on the fixed box 43, and the telescopic end of the expansion rod is fixedly connected to the slide bar 15 to limit the slide bar 15 and effectively prevent the slide bar 15 from deflecting. A sealing ring 42 and a limiting piece 26 are fixedly connected to the slide bar 15. The surface of the sealing ring 42 is attached to the inner wall of the air outlet hole. The slide bar 15 is connected to the sealing plate 24 through a second pull rope 25. In the initial state, the upper surface of the sealing plate 24 is attached to the lower end surface of the slide bar 15. At this time, the sealing ring 42 with an isosceles trapezoid cross-section seals and blocks the air outlet hole, and the rubber sealing ring 42 has the maximum deformation. At this time, the inelastic second pull rope 25 is in a relaxed state. The two ends of the second pull rope 25 are respectively fixedly connected to the slide bar 15 and the sealing plate 24. As the air inside the sealing cavity continuously increases, during the downward movement of the sealing plate 24 inside the sealing cavity, the second pull rope 25 will be gradually tightened. When the second pull rope 25 is tightened and the sealing plate 24 continues to move downward, under the transmission of the second pull rope 25, the slide bar 15 will move downward. When the sealing ring 42 is separated from the through hole, the slide bar 15 will move downward under the action of gravity until the surface of the limiting piece 26 contacts the upper surface of the fixed box 43. At this time, there is a large gap between the slide bar 15 with an inverted T-shaped cross-section and the air outlet hole, and the air on the inner wall of the sealing cavity can all be discharged through the air outlet hole. The sealing plate 24 will move upward to reset under the action of the second spring. When the sealing plate 24 moves upward, it will move against the lower end surface of the slide bar 15, thereby pushing the slide bar 15 upward until the sealing ring 42 seals and blocks the air outlet hole again.

[0044] A rectangular cavity is provided on the inner wall of one side of the cavity, a drainage pipe 34 is fixedly connected to the inner wall of one side of the rectangular cavity, through holes are provided on the upper and lower inner walls of the rectangular cavity, the sliding assembly includes a cross block 36 slidably installed in the through hole, a plurality of elastic sheets 35 are fixedly connected to the cross block 36, each elastic sheet 35 is fitted with the inner wall of the through hole, a connecting hole 38 is provided on the cross block 36, one end of the replenishing pipe 8 is fitted with the surface of the cross block 36, the cross block 36 is connected to the hollow floating plate 18 through a third pull rope 37, and the rectangular cavity is provided with a plurality of elastic sheets 35 fixedly connected to the cross block 36, each elastic sheet 35 is fitted with the inner wall of the through hole, a connecting hole 38 is provided on the cross block 36, one end of the replenishing pipe 8 is fitted with the surface of the cross block 36, and the cross block 36 is connected to the hollow floating plate 18 through a third pull rope 37. The shaped cavity is connected to the hollow cavity. In the initial state, the end faces of the discharge pipe 34 and the replenishing pipe 8 are respectively in close contact with the two side surfaces of the cross block 36, and the connection sealing is good. When the lithium bromide solution at the bottom of the cavity is pumped into the first diverter rod 10 and gradually decreases, the hollow floating plate 18 will move vertically downward under the action of gravity and will always be located at the highest liquid level of the lithium bromide solution. During the downward movement of the hollow floating plate 18, it will gradually move against the upper end surface of the cross block 36, and then push the cross block 36 to move downward together.

[0045] During the relative sliding of the cross block 36, the drain pipe 34 and the replenishing pipe 8, the connecting hole 38 will gradually move to the middle position of the drain pipe 34 and the replenishing pipe 8. At this time, the lithium bromide solution in the replenishing box 4 will be discharged into the cavity through the replenishing pipe 8, the connecting hole 38 and the drain pipe 34 in sequence. As the lithium bromide solution at the bottom of the cavity continues to increase, the hollow floating plate 18 will be pushed up. At this time, each elastic sheet 35 is always in close contact with the inner wall of the through hole. When the hollow floating plate 18 moves up to a certain height, the inelastic third pull rope 37 will be tightened, and the hollow floating plate 18 will continue to move. During the upward movement, since the two ends of the third pull rope 37 are fixedly connected to the cross block 36 and the hollow floating plate 18 respectively, under the transmission action of the third pull rope 37, the cross block 36 will move up and the connecting hole 38 will be staggered with the drain pipe 34 and the replenishing pipe 8 again, that is, the lithium bromide solution inside the replenishing box 4 cannot be discharged into the cavity. At this time, the elastic sheet 35 is still in contact with the inner wall of the through hole. Repeating the above process can realize the automatic replacement of the lithium bromide solution in the cavity, so as to automatically add the purified lithium bromide solution multiple times, which is beneficial for the lithium bromide solution to better remove impurities such as dust in the flue gas.

[0046] In the present invention, during use, the servo motor drives the rotation of the rotating shaft 33, thereby driving the rotation of a plurality of blades 40 and the cam 32 together. During the rotation of the plurality of blades 40, the high-temperature flue gas at 120 degrees Celsius can be conveyed into the lithium bromide solution at 67 degrees Celsius at the bottom of the inverted convex-shaped cavity. The hollow floating plate 18 with a lighter mass always floats above the lithium bromide solution, and the sealing performance is good when the horizontal plate 22 is connected to the inner wall of the cavity. Then, the flue gas can penetrate through the hollow floating plate 18 and be conveyed to the upper part of the inclined plate 19 through the inclined tube 17. The flue gas will be ejected from the inclined tube 17 onto the surface of the inclined plate 19 and will disperse under the blocking action of the inclined plate 19. Since both ends of the first hose are fixedly connected to the first shunt rod 10 and the first pump respectively, and the sealing performance is good when the first hose is connected to the regeneration tower 1, when the first pump works simultaneously, the lithium bromide solution at the bottom of the cavity can be conveyed through the first hose into the interior of the first shunt rod 10. A shunt cavity (not shown) communicating with the spray head 20 is provided inside the part of the first shunt rod 10 located inside the regeneration tower 1, and the lithium bromide solution will be ejected through each spray head 20, enabling the lithium bromide solution to contact the flue gas better and more fully.

[0047] During this process, under the action of heat transfer, the temperature of the flue gas will decrease from 120 degrees Celsius to 80 degrees Celsius, while the temperature of the lithium bromide solution will increase from 67 degrees Celsius to 80 degrees Celsius. After the lithium bromide solution inside the cavity comes into contact with the flue gas, a large amount of sulfurous acid, sulfuric acid, dust, and a large number of impurity ions are dissolved in it. The lithium bromide solution falling onto the inclined plate 19 will be discharged into the interior of the treatment housing 29. The treatment housing 29 can purify the lithium bromide solution, and the heat preservation effect of the treatment housing 29 is good, which can effectively prevent the temperature of the lithium bromide solution from dropping significantly.

[0048] After that, the flue gas can be transported to the desulfurization tower 2 through the connecting pipe under the action of the induced draft fan (not shown) for desulfurization treatment, and is transported to the inside of the absorption tower 3 through another connecting pipe. At this time, after the flue gas is desulfurized, its temperature will drop from eighty degrees Celsius to fifty-two degrees Celsius. Since both ends of the second hose are fixedly connected to the second shunt rod 11 and the second pump 28 respectively, the second pump 28 is connected to the treatment housing 29 through a suction pipe, and the second hose has good sealing when connected to the absorption tower 3. At the same time, the second pump 28 pumps the purified lithium bromide solution inside the treatment housing 29 to the inside of the second shunt rod 11 through the second hose. A shunt cavity (not shown) communicating with the spray heads 20 is also provided inside the part of the second shunt rod 11 located inside the absorption tower 3. The lithium bromide solution will be sprayed out through each spray head 20, so that the lithium bromide solution can come into relatively full contact with the flue gas. At this time, the temperature of the lithium bromide solution is about seventy-nine degrees Celsius. When the lithium bromide solution comes into contact with the flue gas, under the action of heat transfer, the temperature of the flue gas can be raised to seventy-three degrees Celsius, and the lithium bromide solution can be pumped into the replenishment tank 4 under the action of the third pump.

[0049] The absorption tower 3 is provided with a coil pipe 21, and there is circulating water with a temperature of sixty degrees Celsius flowing inside the coil pipe 21. The heat supply network supplies the heating return water at sixty degrees Celsius to the coil pipe 21. During the spraying process of the lithium bromide solution inside the absorption tower 3, the lithium bromide solution can also heat the liquid inside the coil pipe 21 under the action of heat transfer, so that the temperature of the liquid inside it rises from sixty degrees Celsius to sixty-nine degrees Celsius. The heated liquid can be discharged from the coil pipe 21 for use, effectively realizing waste heat recovery. After that, under the action of the induced draft fan (not shown), the flue gas can be discharged into the fixed box 43, and successively passes through the calcium oxide and filter cloth inside the two drying boxes 23. The calcium oxide can preferably absorb the water vapor in the flue gas. After the flue gas is discharged from the discharge pipe 16, since the flue gas is relatively dry, when it mixes with the air in the external environment, it can ensure that no water vapor condensation will occur, realizing the whitening of the flue gas. When the flue gas is discharged after being treated, no large amount of fog plume will be formed, and the treatment effect on the flue gas is good, which is beneficial to the treatment of the flue gas.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A coal-fired boiler flue gas desulfurization and waste heat recovery device, comprising a regeneration tower (1), a desulfurization tower (2) and an absorption tower (3), characterized in that: A draft sleeve (31) is fixedly connected to one side of the regeneration tower (1), a rotating shaft (33) is rotatably connected inside the draft sleeve (31), a plurality of blades (40) and a cam (32) are fixedly connected to the rotating shaft (33), a cavity is provided inside the regeneration tower (1), a horizontal plate (22) and an inclined plate (19) are fixedly connected inside the cavity, an inclined tube (17) is fixedly connected to the horizontal plate (22) and the inclined plate (19), a hollow floating plate (18) is slidably provided inside the cavity, and a sliding assembly is provided on the regeneration tower (1); The desulfurization tower (2) is connected to the regeneration tower (1) and the absorption tower (3) respectively through two connecting pipes; a replenishment box (4) is fixedly connected to one side of the regeneration tower (1); the replenishment box (4) is connected to the regeneration tower (1) through a replenishment pipe (8); the bottom of the regeneration tower (1) and the replenishment box (4) are filled with lithium bromide solution; The absorption tower (3) is connected to a fixed box (43) via an exhaust pipe, a partition (41) having a T-shaped cross section and an exhaust pipe (16) are fixedly connected inside the fixed box (43), a drying component is slidably arranged on the partition (41), the drying component comprises two drying boxes (23), a filter cloth is fixedly connected to the bottom of each drying box (23), the drying box (23) is filled with calcium oxide, and a rotating component is arranged on the fixed box (43).

2. A coal-fired boiler flue gas deoxidation and waste heat recovery device according to claim 1, characterized in that: The rotating assembly comprises a rotating block (30) mounted on the back of the fixed box (43) via a first torsion spring, the cross section of the rotating block (30) being arranged in a T-shape, two sliding openings being arranged on the back of the fixed box (43), a sliding bar (44) being slidably arranged in each of the sliding openings, each of the sliding bars (44) being slidably connected to the rotating block (30), the backs of the two drying boxes (23) being respectively engaged with the two sliding bars (44), and an iron sheet (45) being fixedly connected to the rotating block (30).

3. The coal-fired boiler flue gas deoxidation and waste heat recovery equipment according to claim 1, characterized in that: The regeneration tower (1) is connected to a first diverter rod (10) via a second torsion spring (9), one side of the regeneration tower (1) is connected to an extrusion plate (5) via a first spring (39), and the extrusion plate (5) is connected to the first diverter rod (10) via a first pull rope (7).

4. A coal-fired boiler flue gas deoxidation and waste heat recovery device according to claim 3, characterized in that: A second diverter rod (11) is rotatably connected inside the absorption tower (3), and a transmission wheel and a plurality of spray heads (20) are fixedly connected to the second diverter rod (11) and the first diverter rod (10), and the two transmission wheels are connected via a transmission belt (12).

5. A coal-fired boiler flue gas decolorization and waste heat recovery device according to claim 4, characterized in that: The regeneration tower (1) is fixedly connected to a first pump and a treatment shell (29), the first pump being connected to the first diverter rod (10) via a first hose, and the treatment shell (29) and the absorption tower (3) are both fixedly connected to a second pump (28), one of the second pumps (28) being connected to the second diverter rod (11) via a second hose.

6. The coal-fired boiler flue gas deoxidation and waste heat recovery equipment according to claim 1, characterized in that: A coil (21) and a heat supply network are fixedly arranged inside the absorption tower (3); an L-shaped bracket is fixedly connected to one side of the regeneration tower (1); an air bag (27) is fixedly connected to the L-shaped bracket; an air outlet and an air inlet are provided on the air bag (27); both the air outlet and the air inlet are provided with a one-way valve; a fixed pipe is fixedly connected to the air bag (27); a sealed cavity is provided in the fixed box (43); the fixed pipe is connected to the sealed cavity; a sealing plate (24) is slidably arranged in the sealed cavity; a bending rod (14) is fixedly connected to the sealing plate (24); a second spring is sleeved on the bending rod (14); one end of the second spring is fixedly connected to the bending rod (14); the other end of the second spring is fixedly connected to the fixed box (43); a vertical plate (13) is fixedly connected to the bending rod (14); a plurality of magnets arranged at equal distances are fixedly connected to the vertical plate (13).

7. A coal-fired boiler flue gas deoxidation and waste heat recovery device according to claim 6, characterized in that: The fixed box (43) is provided with an air outlet, a sliding rod (15) having an inverted T-shaped cross section is inserted into the air outlet, a sealing ring (42) and a limiting plate (26) are fixedly connected to the sliding rod (15), a surface of the sealing ring (42) is in contact with an inner wall of the air outlet, and the sliding rod (15) is connected to the sealing plate (24) via a second pull rope (25).

8. The coal-fired boiler flue gas deoxidation and waste heat recovery equipment according to claim 1, characterized in that: A rectangular cavity is formed on one inner wall of the cavity, a drainage pipe (34) is fixedly connected to one inner wall of the rectangular cavity, through holes are formed on the upper and lower inner walls of the rectangular cavity, the sliding assembly comprises a cross block (36) slidably mounted in the through hole, a plurality of elastic sheets (35) are fixedly connected to the cross block (36), each of the elastic sheets (35) is in contact with the inner wall of the through hole, a connecting hole (38) is formed on the cross block (36), and one end of the replenishing pipe (8) is in contact with the surface of the cross block (36).

9. A coal-fired boiler flue gas deoxidation and waste heat recovery device according to claim 8, characterized in that: The cross block (36) is connected to the hollow floating plate (18) via a third pull rope (37), and the rectangular cavity is connected to the hollow cavity.

10. The coal-fired boiler flue gas deoxidation and waste heat recovery equipment according to claim 3, characterized in that: A round rod (6) is rotatably connected to one side of the regeneration tower (1), and the surface of the first pull rope (7) is in contact with the surface of the round rod (6).

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