High-temperature flue gas waste heat pretreatment system
By designing the inner and outer cylinders of the pretreatment device between the flue gas chamber and the bag filter, and utilizing the rotation of the spiral plate to drive the water-containing phosphogypsum to absorb the waste heat of the flue gas, the problem of low utilization rate of waste heat from high-temperature flue gas is solved, achieving efficient heat utilization and device protection.
Patent Information
- Application Number
- CN202511673867.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-01-09
AI Technical Summary
In existing technologies, the waste heat of high-temperature flue gas is not effectively utilized before entering the bag filter dust collector, resulting in heat waste and increasing the burden on the bag filter dust collector.
A pretreatment device is added between the smoke chamber and the bag filter dust collector. The pretreatment device consists of an inner cylinder and an outer cylinder. The inner cylinder is equipped with a flue gas passage and a first spiral plate for flue gas heat exchange. The outer cylinder is equipped with a second spiral plate for material movement. The spiral plate is driven to rotate by a rotation drive component, so that the hydrated phosphogypsum moves axially between the inner and outer cylinders, absorbs the waste heat of the flue gas and converts it into hemihydrate, anhydrous phosphogypsum and water vapor.
It improves the utilization rate of waste heat from flue gas, reduces flue gas temperature, reduces heat exchange products entering the bag filter dust collector, reduces the burden on the device, and improves the efficiency of heat utilization and the service life of the device.
Smart Images
Figure CN121297481A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of ceramsite calcination technology, and in particular to a high-temperature flue gas waste heat pretreatment system. Background Technology
[0002] The calcination of expanded clay aggregate has a positive environmental impact. For example, using industrial solid waste to produce expanded clay aggregate not only solves the waste disposal problem but also achieves resource utilization. The calcination kiln equipment for expanded clay aggregate, such as a rotary kiln, can reach operating temperatures of 950℃~1050℃. The flue gas and dust emitted from the calcination kiln need to be treated. The flue gas from the calcination kiln generally needs to pass through a smoke chamber for ash reduction, and then through a bag filter for dust removal and purification before being discharged into the atmosphere. However, the bag filter requires the incoming flue gas temperature to not exceed 200℃, otherwise it will be damaged. Even after ash reduction in the smoke chamber, the temperature of the high-temperature flue gas is still as high as 350℃-550℃. Directly entering the bag filter with this high-temperature flue gas would damage the bag filter, and the residual heat of the high-temperature flue gas would also be wasted.
[0003] Therefore, in the existing flue gas treatment technology for calcined ceramsite, during the process of transporting flue gas from the flue chamber to the bag filter, hydrated phosphogypsum is added to the transport pipeline. The hydrated phosphogypsum can absorb the waste heat of the flue gas and will be converted into hemihydrate gypsum. This not only reduces the temperature of the flue gas when it enters the bag filter, but also avoids the waste of heat.
[0004] However, when hydrous phosphogypsum absorbs the waste heat from flue gas, some of the hemihydrate gypsum continues to absorb heat and may further transform into powdery anhydrous gypsum (hydrous phosphogypsum loses 1.5 molecules of water of crystallization when calcined at 160℃~180℃ to form hemihydrate gypsum; if the temperature exceeds 200℃, some of the hemihydrate gypsum may further transform into anhydrous gypsum). If the flue gas comes into direct contact with hydrous phosphogypsum, the powdery anhydrous gypsum and water vapor are easily carried by the flue gas into the bag filter, so the bag filter also needs to remove and purify the anhydrous gypsum, which will greatly increase the burden on the bag filter. If the flue gas comes into indirect contact with hydrous phosphogypsum, the heat of the flue gas needs to be transferred to the pipeline first and then absorbed by the hydrous phosphogypsum, which greatly reduces the utilization rate of the flue gas heat. Summary of the Invention
[0005] In view of the deficiencies in the existing technology, the technical problem solved by the present invention is: how to improve the utilization rate of flue gas heat without increasing the burden on the bag filter dust collector.
[0006] To achieve the above objectives, the high-temperature flue gas waste heat pretreatment system provided by the present invention includes: The pretreatment device is connected at one end to the smoke chamber and at the other end to the bag filter dust collector. The pretreatment device includes an inner cylinder and an outer cylinder, with the outer cylinder fitted onto the inner cylinder; the inner cylinder is equipped with a first spiral plate for the movement of water-containing phosphogypsum and a flue gas passage for the movement of flue gas; a second spiral plate for the movement of water-containing phosphogypsum is provided between the inner wall of the outer cylinder and the outer wall of the inner cylinder. The axis of the first spiral plate is parallel to the axis of the inner cylinder; the axis of the second spiral plate is parallel to the axis of the first spiral plate; one end of the first spiral plate is provided with an input end, and one end of the second spiral plate is provided with an output end; the end of the outer cylinder is connected to the end of the inner cylinder, and one end of the inner cylinder is provided with a shroud. A rotary drive assembly is disposed on the outer wall of the outer cylinder, and the rotary drive assembly is used to drive the first spiral plate and the second spiral plate to rotate.
[0007] By adopting the above technical solution, a pretreatment device is added between the smoke chamber and the bag filter. The pretreatment device consists of an inner cylinder and an outer cylinder. The inner cylinder contains a flue gas passage and a first spiral plate to allow the flue gas to move from the smoke chamber to the bag filter. Inside the inner cylinder, the flue gas directly exchanges heat with the hydrated phosphogypsum. The outer cylinder contains a second spiral plate for material movement. During the process of the flue gas moving from the smoke chamber to the bag filter, the waste heat of the flue gas is first absorbed by the hydrated phosphogypsum in the first spiral plate. The hydrated phosphogypsum falls from the inner cylinder into the outer cylinder. The waste heat of the flue gas is absorbed by the constantly flowing hydrated phosphogypsum, which is then converted into hemihydrate phosphogypsum, anhydrous phosphogypsum, and water vapor. The rotation drive assembly drives the pretreatment device to rotate, and the first and second spiral plates also rotate simultaneously. This will generate a force that causes the hydrated phosphogypsum to move axially. The hydrated phosphogypsum is first pushed to the right by the first spiral plate at the bottom of the inner cylinder, then falls into the second spiral plate at the bottom of the outer cylinder, and is pushed to the left by the second spiral plate. The converted hemihydrate and anhydrous phosphogypsum will also move from the first spiral plate to the second spiral plate, and move axially with the rotation of the second spiral plate until they are discharged from the output end. Throughout the entire process, the second spiral plate not only increases the heat dissipation area and improves the utilization rate of flue gas heat, but also allows some of the heat exchange products between the flue gas and the hydrated phosphogypsum to enter the second spiral plate, reducing the amount that directly enters the bag filter with the flue gas. Simultaneously, it further promotes the movement of the heat-absorbing material, improving the smoothness of the movement and further enhancing the utilization rate of flue gas heat.
[0008] In one embodiment, a dust collection assembly is provided between the pretreatment device and the bag filter device. The dust collection assembly includes a dust collection box, an attachment plate, and a sedimentation box. One end of the dust collection box is connected to the pretreatment device, and the other end of the dust collection box is connected to the bag filter device. The attachment plate is located on the flow path of the flue gas inside the dust collection box, and the sedimentation box is located at the bottom of the dust collection box. The sedimentation box is used to collect the dust falling from the attachment plate.
[0009] By adopting the above technical solution, before entering the bag filter dust collector, the flue gas can be degassed of hemihydrate phosphogypsum, anhydrous phosphogypsum and water vapor, and the adsorbed dust and liquid can be collected, thereby further reducing the burden on the bag filter dust collector.
[0010] In one embodiment, the input end is connected to a feeding box, and the output end is connected to a receiving bin.
[0011] By adopting the above technical solution, it is convenient to input water-containing phosphogypsum into the inner cylinder and to collect the product after calcination of water-containing phosphogypsum.
[0012] In one embodiment, the receiving bin is located on one side of the dust collector, with the inner cylinder connected to the dust collector and the outer cylinder connected to the receiving bin.
[0013] By adopting the above technical solution, it is convenient to carry out flue gas impurity removal and collection of calcined products of water-containing phosphogypsum simultaneously.
[0014] In one embodiment, the outer cylinder includes multiple layers of waste heat utilization channels arranged in sequence, with a second spiral plate between each two adjacent waste heat utilization channels, and a second spiral plate between the innermost waste heat utilization channel and the inner cylinder.
[0015] By adopting the above technical solution, the hydrated phosphogypsum in multiple second spiral plates can simultaneously absorb the waste heat of flue gas, thereby improving the utilization efficiency of waste heat and enhancing the cooling effect of flue gas, thus preventing the temperature of the flue gas from exceeding the range that the bag filter can withstand.
[0016] In one embodiment, the output terminal is located at the end of the outermost second spiral plate, and a connecting channel is provided between two adjacent second spiral plates, with the connecting channel located at the end of the second spiral plate.
[0017] By adopting the above technical solution, after flowing through one second spiral plate, the hydrated phosphogypsum can enter the next second spiral plate and continue to move until it has flowed through all the second spiral plates. This increases the distance the hydrated phosphogypsum moves and the time it takes to absorb heat, thereby fully absorbing the waste heat of the flue gas, further improving the utilization efficiency of waste heat, and improving the cooling effect of the flue gas.
[0018] In one embodiment, the feeding bin and the receiving bin are located at the same end of the pretreatment device; Alternatively, the feed box and the receiving bin are located at both ends of the pretreatment device.
[0019] By adopting the above technical solution, the placement of the feeding box and receiving bin can be determined according to the number of the second spiral plates, thereby improving the applicability of the high-temperature flue gas waste heat pretreatment system and reducing site limitations.
[0020] In one embodiment, a connection channel is provided between each of the second spiral plates (104) and the first spiral plate (102), and an output terminal is provided at the other end of each of the second spiral plates.
[0021] By adopting the above technical solution, hydrated phosphogypsum can be simultaneously input into multiple second spiral plates, thereby improving the utilization efficiency of waste heat and the effect of flue gas cooling.
[0022] In one embodiment, the input end is located on the same side of the pretreatment device as the bag filter, and the output end is located on the same side of the pretreatment device as the smoke chamber.
[0023] By adopting the above technical solution, the horizontal movement direction of the flue gas is opposite to that of the hydrated phosphogypsum, thereby gradually increasing the temperature of the hydrated phosphogypsum and achieving a better calcination effect.
[0024] In summary, the present invention has at least one of the following beneficial technical effects: 1. By adding a pretreatment device between the smoke chamber and the bag filter, the pretreatment device consists of an inner cylinder and an outer cylinder. The inner cylinder contains a flue gas passage and a first spiral plate to allow flue gas to move from the smoke chamber to the bag filter. Inside the inner cylinder, the flue gas directly exchanges heat with the hydrated phosphogypsum. The outer cylinder contains a second spiral plate for material movement. During the movement of the flue gas from the smoke chamber to the bag filter, the waste heat of the flue gas is first absorbed by the hydrated phosphogypsum in the first spiral plate. The hydrated phosphogypsum falls from the inner cylinder into the outer cylinder. The waste heat of the flue gas is absorbed by the constantly flowing hydrated phosphogypsum, which is then converted into hemihydrate phosphogypsum, anhydrous phosphogypsum, and water vapor. A rotating drive assembly rotates the pretreatment device, and simultaneously, the first and second spiral plates rotate as well, generating… A force that causes the hydrated phosphogypsum to move axially occurs when the hydrated phosphogypsum is first pushed to the right by the first spiral plate at the bottom of the inner cylinder, then falls into the second spiral plate at the bottom of the outer cylinder, and is pushed to the left by the second spiral plate. The converted hemihydrate phosphogypsum and anhydrous phosphogypsum also move from the first spiral plate to the second spiral plate and move axially with the rotation of the second spiral plate until they are discharged from the output end. In the whole working process, the role of the second spiral plate is not only to increase the heat dissipation area and improve the utilization rate of flue gas heat, but also to allow some of the products of heat exchange between flue gas and hydrated phosphogypsum to enter the second spiral plate, reducing the amount that directly enters the bag filter dust collector with the flue gas. At the same time, it further promotes the movement of heat-absorbing materials, improves the smoothness of the movement of heat-absorbing materials, and further improves the utilization rate of flue gas heat.
[0025] 2. Through the multi-layer design of the outer cylinder and the design of the waste heat utilization channel, the water-containing phosphogypsum in multiple second spiral plates can simultaneously absorb the waste heat of the flue gas, thereby improving the waste heat utilization efficiency and the flue gas cooling effect, preventing the flue gas temperature from exceeding the range that the bag filter can withstand. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the high-temperature flue gas waste heat pretreatment system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the pretreatment device according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the preprocessing device according to an embodiment of the present invention; Figure 4 for Figure 1 The front view; Figure 5 This is a schematic diagram of the structure of the first multi-layer waste heat utilization channel according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the second type of multi-layer waste heat utilization channel according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the dust suppression component according to an embodiment of the present invention.
[0027] In the diagram: 1-Pretreatment device, 101-Inner cylinder, 102-First spiral plate, 103-Outer cylinder, 1031-Waste heat utilization channel, 104-Second spiral plate, 105-Flue gas channel, 106-Rectifier, 2-Smoke chamber, 3-Dust suppression component, 301-Dust collection box, 302-Attachment plate, 303-Sedimentation box, 4-Rotation drive component, 5-Bag dust collector, 6-Feeding box, 7-Receiving bin, 8-Input end, 9-Output end. Detailed Implementation
[0028] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0029] The high-temperature flue gas waste heat pretreatment system in this embodiment of the invention is described in [reference needed]. Figure 1-5 As shown, the high-temperature flue gas waste heat pretreatment system includes a pretreatment device 1, one end of which is connected to the flue chamber 2. The other end of the pretreatment device 1 is connected in sequence to a dust suppression component 3 and a bag filter 5. The temperature of the flue gas in the flue chamber 2 is higher, while the temperature in the dust suppression component 3 is lower. The pretreatment device 1 includes an inner cylinder 101 and an outer cylinder 103, with the outer cylinder 103 sleeved on the inner cylinder 101. The inner cylinder 101 is provided with a first spiral plate 102 for the movement of water-containing phosphogypsum and a flue gas passage 105 for the movement of flue gas. A second spiral plate 104 for the movement of water-containing phosphogypsum is provided between the inner wall of the outer cylinder 103 and the outer wall of the inner cylinder 101. The first spiral plate 102 is spiral-shaped, and its axis is parallel to the axis of the inner cylinder 101. The second spiral plate 104 is spiral-shaped, and its axis is parallel to the axis of the first spiral plate 102. One end of the first spiral plate 102 is provided with an input end 8, and one end of the second spiral plate 104 is provided with an output end 9. The input end 8 is connected to a feeding box 6, and the output end 9 is connected to a receiving bin 7, which facilitates the input of water-containing phosphogypsum into the inner cylinder 101 through the feeding box 6 and the collection of the product after calcination of the water-containing phosphogypsum through the receiving bin 7. The right end of the outer cylinder 103 is longer than the right end of the inner cylinder 101, which facilitates the direct fall of the water-containing phosphogypsum in the inner cylinder 101 into the outer cylinder 103. One end of the inner cylinder 101 is provided with a rectifier 106, which concentrates the flue gas in the smoke chamber 2 and blows it into the inner cylinder 101. The rotary drive assembly 4 is disposed on the outer wall of the outer cylinder 103. The rotary drive assembly 4 is used to drive the outer cylinder 103 to rotate. The outer cylinder 103 drives the inner cylinder 101, the first spiral plate 102 and the second spiral plate 104 to rotate synchronously. Because the threads of the two are oriented differently, the movement directions of the water-containing phosphogypsum are different.
[0030] Therefore, it can be seen that the present invention adds a pretreatment device 1 between the smoke chamber 2 and the bag filter 5. The pretreatment device 1 is divided into an inner cylinder 101 and an outer cylinder 103. A flue gas channel 105 and a first spiral plate 102 are provided inside the inner cylinder 101 to allow the flue gas to move from the smoke chamber 2 to the bag filter 5. Inside the inner cylinder 101, the flue gas directly exchanges heat with the water-containing phosphogypsum. A second spiral plate 104 is provided inside the outer cylinder 103 to allow the material to move. During the process of flue gas moving from the smoke chamber 2 to the bag filter 5, the residual heat of the flue gas is first absorbed by the hydrated phosphogypsum in the first spiral plate 102. The hydrated phosphogypsum falls from the inner cylinder 101 into the outer cylinder 103. The residual heat of the flue gas is absorbed by the hydrated phosphogypsum, which is always in a state of fluidity. The hydrated phosphogypsum will be converted into hemihydrate phosphogypsum, anhydrous phosphogypsum and water vapor. The rotation drive assembly 4 drives the rotation of the outer cylinder 103 and the second spiral plate 104, which will generate a force that causes the hydrated phosphogypsum to move axially. That is, the hydrated phosphogypsum is first pushed to the right by the first spiral plate 102 at the bottom of the inner cylinder 101, and then falls from the inner cylinder 101 into the second spiral plate 104. At the bottom of the outer cylinder 103, it is pushed to the left by the second spiral plate 104. The converted hemihydrate and anhydrous phosphogypsum also move from the first spiral plate 102 to the second spiral plate 104, and move axially with the rotation of the second spiral plate 104 until they are discharged from the output end 9. During the entire operation, the function of the second spiral plate 104 is to increase the heat dissipation area and improve the utilization rate of flue gas heat. When the phosphogypsum treated by the first spiral plate enters the second spiral plate, the moisture is further removed, enhancing the stability of its hemihydrate and anhydrous effects, while further reducing the overall temperature of the flue gas.
[0031] Preferred, see Figure 5 , Figure 6 As shown, a specific structure of the outer cylinder 103 is provided: The outer cylinder 103 includes multiple layers of waste heat utilization channels 1031 arranged in sequence. A second spiral plate 104 is provided between two adjacent waste heat utilization channels 1031. A second spiral plate 104 is provided between the innermost waste heat utilization channel 1031 and the inner cylinder 101.
[0032] Specifically, the outer cylinder 103 is a multi-layer waste heat utilization channel 1031, which is nested from the inside to the outside. On two adjacent waste heat utilization channels 1031, a second spiral plate 104 is provided between the outer wall of the inner waste heat utilization channel 1031 and the inner wall of the outer waste heat utilization channel 1031. The second spiral plate 104 is also spiral-shaped. In order to enhance the conductivity and utilization efficiency of the waste heat of the flue gas, a second spiral plate 104 is also provided between the innermost waste heat utilization channel 1031 and the inner cylinder 101. The water-containing phosphogypsum in the multiple second spiral plates 104 can absorb the waste heat of the flue gas at the same time, thereby improving the utilization efficiency of the waste heat and ensuring the cooling effect of the flue gas, so as to prevent the temperature of the flue gas from exceeding the range that the bag filter dust collector 5 can withstand.
[0033] Preferred, see Figure 5 As shown, a design structure for the first multi-layer waste heat utilization channel 1031 is provided: The output end 9 is located at the end of the outermost second spiral plate 104. A connecting channel is provided between two adjacent second spiral plates 104, and the connecting channel is located at the end of the second spiral plate 104.
[0034] Specifically, two adjacent second spiral plates 104 are connected in series through a connecting channel, that is, the tail (head) of the second spiral plate 104 is connected to the head (tail) of the next second spiral plate 104, so that all the second spiral plates 104 form a channel. The hydrated phosphogypsum not only moves around the pretreatment device 1, but also moves back and forth along the pretreatment device 1 (the head and tail of a second spiral plate 104 are located at both ends of the outer cylinder 103, and enter the next pipeline through the connecting channel); at the same time, after the hydrated phosphogypsum moves from the inner cylinder 101 to the outer cylinder 103, the movement of the hydrated phosphogypsum can be from the outside to the inside or from the inside to the outside, simply by changing the positions of the input end 8 and the output end 9. The input end 8 is positioned at the end of the innermost second spiral plate 104 and the output end 9 is positioned at the end of the outermost second spiral plate 104 when the flow is from the inside to the outside. When the flow is from the outside to the inside, the input end 8 is positioned at the end of the outermost second spiral plate 104 and the output end 9 is positioned at the end of the innermost second spiral plate 104. After flowing through one second spiral plate 104, the hydrated phosphogypsum can enter the next second spiral plate 104 and continue to move until it has flowed through all the second spiral plates 104. This increases the distance the hydrated phosphogypsum moves and the time it takes to absorb heat, thereby fully absorbing the waste heat of the flue gas, further improving the utilization efficiency of waste heat, and ensuring the cooling effect of the flue gas.
[0035] Furthermore, the feed box 6 and the receiving bin 7 are located at the same end of the pretreatment device 1; Alternatively, the feed box 6 and the receiving bin 7 are located at both ends of the pretreatment device 1.
[0036] Specifically, the placement of the feed box 6 and the receiving bin 7 can be determined according to the number of the second spiral plates 104. When the number of the second spiral plates 104 is odd, the feed box 6 and the receiving bin 7 are located at both ends of the pretreatment device 1. When the number of the second spiral plates 104 is even, the feed box 6 and the receiving bin 7 are located at the same end of the pretreatment device 1. Therefore, in the design, the number of the second spiral plates 104 can be designed according to the requirements, thereby improving the applicability of the high-temperature flue gas waste heat pretreatment system and reducing site limitations.
[0037] Preferred, see Figure 6 As shown, a second design structure for the multi-layer waste heat utilization channel 1031 is provided: Each second spiral plate 104 is provided with a connection channel between itself and the first spiral plate 102, and the other end of the second spiral plate 104 is provided with an output end 9.
[0038] Specifically, multiple second spiral plates 104 are connected in parallel, and an output end 9 is designed at the end of each second spiral plate 104. All second spiral plates 104 can be connected to the first spiral plate 102, thereby realizing the synchronous input of water-containing phosphogypsum to all second spiral plates 104, increasing the flow rate of water-containing phosphogypsum in the second spiral plates 104, thereby improving the utilization efficiency of waste heat and ensuring the effect of flue gas cooling.
[0039] Preferably, the input end 8 and the bag filter 5 are located on the same side of the pretreatment device 1, and the output end 9 and the smoke chamber 2 are located on the same side of the pretreatment device 1.
[0040] Specifically, the above design causes the flue gas to move in the opposite direction to the water-containing phosphogypsum in the horizontal direction, thereby gradually increasing the temperature of the water-containing phosphogypsum and achieving a better calcination effect.
[0041] Preferred, see Figure 4 , Figure 7 As shown, a dust collection assembly 3 is provided between the pretreatment device 1 and the bag filter 5. The dust collection assembly 3 includes a dust collection box 301, an attachment plate 302, and a sedimentation box 303. One end of the dust collection box 301 is connected to the pretreatment device 1, and the other end of the dust collection box 301 is connected to the bag filter 5. The attachment plate 302 is located on the flow path of the flue gas inside the dust collection box 301, and the sedimentation box 303 is located at the bottom of the dust collection box 301. The sedimentation box 303 is used to collect the dust falling from the attachment plate 302.
[0042] Specifically, before entering the bag filter 5, the flue gas enters the dust collection box 301. As the flue gas continues to move, it comes into contact with the attachment plate 302. The hemihydrate phosphogypsum, anhydrous phosphogypsum, and water vapor carried in the flue gas will adhere to the attachment plate 302, thus performing preliminary filtration of the flue gas. The hemihydrate phosphogypsum, anhydrous phosphogypsum, and water vapor attached to the attachment plate 302 will fall into the sedimentation box 303 at the bottom due to gravity, thereby collecting the adsorbed hemihydrate phosphogypsum, anhydrous phosphogypsum, and water vapor, thereby further reducing the burden on the bag filter 5.
[0043] Furthermore, the receiving bin 7 is located on one side of the dust collector 301, with the inner cylinder 101 connected to the dust collector 301 and the outer cylinder 103 connected to the receiving bin 7, so that the removal of impurities from the flue gas and the collection of calcined products of water-containing phosphogypsum can be carried out simultaneously.
[0044] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A high-temperature flue gas waste heat pretreatment system, characterized in that, It includes: The pretreatment device (1) is connected at one end to the smoke chamber (2) and at the other end to the bag filter (5); The pretreatment device (1) includes an inner cylinder (101) and an outer cylinder (103), with the outer cylinder (103) fitted onto the inner cylinder (101). The inner cylinder (101) is provided with a first spiral plate (102) for moving hydrated phosphogypsum and a flue gas passage (105) for moving flue gas. A second spiral plate (104) for moving hydrated phosphogypsum is provided between the inner wall of the outer cylinder (103) and the outer wall of the inner cylinder (101). The axis of the first spiral plate (102) is parallel to the axis of the inner cylinder (101); the axis of the second spiral plate (104) is parallel to the axis of the first spiral plate (102); one end of the first spiral plate (102) is provided with an input end (8), and one end of the second spiral plate (104) is provided with an output end (9); the end of the outer cylinder (103) is connected to the end of the inner cylinder (101), and one end of the inner cylinder (101) is provided with a shunting cover (106). A rotary drive assembly (4) is disposed on the outer wall of the outer cylinder (103) and is used to drive the first spiral plate (102) and the second spiral plate (104) to rotate.
2. The high-temperature flue gas waste heat pretreatment system as described in claim 1, characterized in that: A dust collection assembly (3) is provided between the pretreatment device (1) and the bag filter (5). The dust collection assembly (3) includes a dust collection box (301), an attachment plate (302), and a sedimentation box (303). One end of the dust collection box (301) is connected to the pretreatment device (1), and the other end of the dust collection box (301) is connected to the bag filter (5). The attachment plate (302) is located on the flow path of the flue gas inside the dust collection box (301). The sedimentation box (303) is located at the bottom of the dust collection box (301) and is used to collect the dust falling on the attachment plate (302).
3. The high-temperature flue gas waste heat pretreatment system as described in claim 2, characterized in that: The input end (8) is connected to the feeding box (6), and the output end (9) is connected to the receiving bin (7).
4. The high-temperature flue gas waste heat pretreatment system as described in claim 3, characterized in that: The receiving bin (7) is located on one side of the dust collector (301), with the inner cylinder (101) connected to the dust collector (301) and the outer cylinder (103) connected to the receiving bin (7).
5. The high-temperature flue gas waste heat pretreatment system as described in claim 1, characterized in that: The outer cylinder (103) includes multiple layers of waste heat utilization channels (1031) arranged in sequence. A second spiral plate (104) is provided between two adjacent waste heat utilization channels (1031). A second spiral plate (104) is provided between the innermost waste heat utilization channel (1031) and the inner cylinder (101).
6. The high-temperature flue gas waste heat pretreatment system as described in claim 5, characterized in that: The output end (9) is located at the end of the outermost second spiral plate (104), and a connecting channel is provided between two adjacent second spiral plates (104), and the connecting channel is located at the end of the second spiral plate (104).
7. The high-temperature flue gas waste heat pretreatment system as described in claim 6, characterized in that: The feeding box (6) and the receiving bin (7) are located at the same end of the pretreatment device (1); Alternatively, the feed box (6) and the receiving bin (7) are located at both ends of the pretreatment device (1).
8. The high-temperature flue gas waste heat pretreatment system as described in claim 5, characterized in that: A connection channel is provided between each of the second spiral plates (104) and the first spiral plate (102), and an output terminal (9) is provided at the other end of each of the second spiral plates (104).
9. The high-temperature flue gas waste heat pretreatment system as described in claim 8, characterized in that: The input end (8) and the bag filter (5) are located on the same side of the pretreatment device (1), and the output end (9) and the smoke chamber (2) are located on the same side of the pretreatment device (1).