A rotary kiln tail gas heat recovery device

Abstract

The utility model discloses a rotary kiln tail gas heat recovery device relates to tail gas heat recovery technical field, including heat conduction box, the heat conduction box one side surface is fixedly connected with water tank, and the water tank top surface one end intercommunication fixedly connected with first flange inlet pipe, and the water tank bottom surface one end intercommunication fixedly connected with first flane outlet pipe, and the second flange inlet pipe is equipped with heat conduction pipe, and one end intercommunication fixedly connected with first flange inlet pipe of heat conduction box is equipped with the air outlet of heat conduction box another end, and the air outlet end fixedly connected with first flange plate, the utility model discloses the setting of heat conduction box and water tank is pasted, and heat conduction pipe is serpentine arrangement and is in proper order through the multiple perforations of heat conduction box two side surfaces, and the contact area of tail gas and heat conduction pipe is convenient for increasing, and the heat exchange efficiency has been improved, the problem that the filter screen of traditional device high temperature damage leads to the poor purification effect has been solved finally, and the purification effect, equipment reliability and overall operation efficiency of rotary kiln tail gas treatment have been improved.

Description

Technical Field

[0001] This utility model relates to the field of tail gas heat recovery technology, and in particular to a rotary kiln tail gas heat recovery device. Background Technology

[0002] In the industrial production field, rotary kilns are key equipment in industries such as cement, ceramics, and refractory materials. During operation, they generate a large amount of high-temperature exhaust gas. These exhaust gases are usually 300℃-800℃ high and contain not only a large amount of recyclable heat energy, but also pollutants such as dust, sulfides, and nitrogen oxides.

[0003] Existing rotary kiln exhaust gas treatment devices typically use filters to intercept and filter large particulate pollutants in the exhaust gas. However, the temperature of rotary kiln exhaust gas often reaches 300℃-800℃. Under such high temperatures, ordinary filter materials are unable to withstand the pressure and are prone to deformation, melting, or even burning. Once the filter is damaged, it not only reduces the filtration effect of the exhaust gas, allowing a large amount of untreated pollutants to be directly emitted into the atmosphere, causing environmental pollution, but also increases equipment maintenance and labor costs due to frequent filter replacements. It also affects the continuous and stable production of the rotary kiln, reducing production efficiency. Furthermore, traditional filters can only simply intercept large particulate pollutants, and their removal effect on gaseous pollutants such as sulfides and nitrogen oxides, as well as fine particulate pollutants in the exhaust gas, is very limited. Therefore, improvements are needed to address these issues. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a rotary kiln tail gas heat recovery device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a rotary kiln tail gas heat recovery device, comprising a heat-conducting box, a water tank fixedly connected to one side of the heat-conducting box, a first flange water inlet pipe fixedly connected to one end of the top surface of the water tank, a first flange water outlet pipe fixedly connected to one end of the bottom surface of the water tank, a heat-conducting pipe provided inside the second flange water inlet pipe, a first flange air inlet pipe fixedly connected to one end of the heat-conducting box, an air outlet bucket installed at the other end of the heat-conducting box, a first flange fixedly connected to the end of the air outlet bucket, a connecting pipe flanged to the first flange, and a filter assembly fixedly connected to one end of the connecting pipe.

[0006] Preferably, the filter assembly includes a filter box, on which a first filter block is fixedly mounted on each of the inner walls on both sides, and a second filter block is mounted on the opposite surface of each of the first filter blocks. A partition is fixedly mounted between the opposite surfaces of the second filter blocks, and a liquid storage chamber is provided between the partition and the bottom surface of the filter box. A separating bottom plate is fixedly mounted on the bottom surfaces of the first and second filter blocks, and a discharge pipe is fixedly mounted at one end of the filter box.

[0007] Preferably, a mounting frame is fixedly connected to one end of the air outlet hopper, and a ring of mounting holes is evenly opened on one end face of the mounting frame. The heat conduction box is located on one end face of the air outlet hopper and has multiple bolt holes corresponding to the mounting holes. Fixing bolts are passed through the mounting holes and bolt holes.

[0008] Preferably, a second flange water inlet pipe is provided at one lower corner of one side of the water tank, and a second flange water outlet pipe is provided diagonally opposite to the second flange water inlet pipe on one side of the water tank. One end of the heat-conducting pipe is fixedly connected to the second flange water inlet pipe, and the other end of the heat-conducting pipe is fixedly connected to the second flange water outlet pipe.

[0009] Preferably, multiple perforations are evenly distributed on both sides of the heat-conducting box, and the heat-conducting pipes are arranged in a serpentine pattern and pass through the multiple perforations in sequence.

[0010] Preferably, the first filter block is made of porous silicon carbide ceramic, and the second filter block is made of coal-based columnar activated carbon.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model, through the close fit between the heat-conducting box and the water tank, and the serpentine arrangement of the heat-conducting pipes passing through multiple perforations on both sides of the heat-conducting box, facilitates increasing the contact area between the exhaust gas and the heat-conducting pipes, improving heat exchange efficiency, and thus enabling the full recovery of heat energy from the exhaust gas; furthermore, the diagonally arranged second flange inlet and outlet pipes on the water tank facilitate the formation of a water circulation path, improving the efficiency of heat transfer, and thus enabling the effective utilization of recovered heat; the first filter block, made of porous silicon carbide ceramic material, and... The second filter block uses coal-based columnar activated carbon, which facilitates the filtration of large particulate pollutants, small particulate pollutants, and gaseous pollutants, improving the exhaust gas purification effect and enabling efficient exhaust gas purification. Furthermore, the liquid storage chamber between the partition and the bottom of the filter box facilitates the collection and treatment of pollutants during the filtration process, improving the stability of the purification process and enabling continuous and effective exhaust gas purification. Ultimately, this solves the problem of poor purification effect caused by high-temperature damage to the filter screen in traditional devices, improving the purification effect, equipment reliability, and overall operating efficiency of rotary kiln exhaust gas treatment. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0013] Figure 1 This is a first-view schematic diagram of the overall structure proposed in this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the water tank proposed in this utility model;

[0015] Figure 3 This is a schematic diagram of the overall structure of the heat-conducting box proposed in this utility model;

[0016] Figure 4 This is a schematic cross-sectional view of the filter box proposed in this utility model.

[0017] The numbers in the diagram are as follows: 1. Second flange inlet pipe; 2. First flange inlet pipe; 3. Heat conduction box; 4. Connecting pipe; 5. Filter box; 6. Air outlet hopper; 7. Discharge pipe; 8. Second flange outlet pipe; 9. First flange; 10. Heat conduction pipe; 11. Water tank; 12. Mounting frame; 13. Second filter block; 14. Fixing bolts; 15. First filter block; 16. First flange outlet pipe; 17. Partition plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Example: See Figure 1-4This utility model discloses a rotary kiln tail gas heat recovery device, comprising a heat-conducting box 3, a water tank 11 fixedly connected to one side of the heat-conducting box 3, a first flange water inlet pipe 2 fixedly connected to one end of the top surface of the water tank 11, a first flange water outlet pipe 16 fixedly connected to one end of the bottom surface of the water tank 11, a heat-conducting pipe 10 disposed inside the second flange water inlet pipe 1, a first flange air inlet pipe fixedly connected to one end of the heat-conducting box 3, and an air outlet hopper 6 installed at the other end of the heat-conducting box 3. A first flange 9 is fixedly connected to the end of the air outlet hopper 6, and a connecting pipe 4 is flanged on the first flange 9. A filter assembly is fixedly connected to one end of the connecting pipe 4. The heat-conducting box 3 is made of Q345R boiler and pressure vessel steel, which is resistant to high temperature and has high strength. The water tank 11 is made of... The material is 304 stainless steel, which has strong corrosion resistance; the heat pipe 10 is made of copper, with a thermal conductivity of up to 401W / (m·K), exhibiting excellent thermal conductivity; this structure, through the close fit between the heat-conducting box 3 and the water tank 11, and the serpentine arrangement of the heat-conducting pipe 10 within the heat-conducting box 3, greatly increases the contact area between the exhaust gas and the heat-conducting pipe 10, significantly improving heat recovery efficiency and achieving efficient utilization of exhaust gas thermal energy; the filter assembly includes a filter box 5, with first filter blocks 15 fixedly attached to the inner walls of both sides of the filter box 5, and second filter blocks 13 installed on the opposite surfaces of the first filter blocks 15, with a partition 17 fixedly attached between the opposite surfaces of the second filter blocks 13, and a liquid storage chamber provided between the partition 17 and the inner bottom surface of the filter box 5, the first A partition plate is fixedly connected to the bottom surfaces of filter block 15 and second filter block 13, and a discharge pipe 7 is fixedly connected to one end of filter box 5. The purification liquid in the storage chamber is a 10%-20% sodium hydroxide (NaOH) aqueous solution. The first filter block 15 is made of porous silicon carbide ceramic material with a Mohs hardness of 9.2 and a high temperature resistance of up to 1600℃, which can stably intercept large particulate pollutants at high temperatures. The second filter block 13 is made of coal-based columnar activated carbon with strong adsorption performance. This filter assembly uses the first filter block 15, the second filter block 13, and the sodium hydroxide aqueous solution in the storage chamber for multiple purification processes. First, the first filter block 15 intercepts large particles, and the second filter block 13 adsorbs small particles and gaseous pollutants. The acidic gas is neutralized by sodium hydroxide aqueous solution, and then filtered twice, which greatly improves the purification effect of the exhaust gas and ensures that the exhaust gas meets the emission standards. A mounting frame 12 is fixedly connected to one end of the exhaust hopper 6. A ring of mounting holes is evenly opened on one end face of the mounting frame 12. The heat conduction box 3 is located on one end face of the exhaust hopper 6 and has multiple bolt holes corresponding to the mounting holes. Fixing bolts 14 are inserted between the mounting holes and the bolt holes. The mounting frame 12 and the fixing bolts 14 are all made of 35CrMo alloy structural steel, which has excellent fastening performance. Through the cooperation of the mounting frame 12, mounting holes, bolt holes and fixing bolts 14, the exhaust hopper 6 and the heat conduction box 3 are firmly connected, which improves the overall structural stability and reliability of the device and ensures the long-term stable operation of the equipment.

[0020] In this invention, a second flange inlet pipe 1 is provided at one lower corner of one side of the water tank 11, and a second flange outlet pipe 8 is provided diagonally opposite to the second flange inlet pipe 1 on one side of the water tank 11. One end of the heat-conducting pipe 10 is fixedly connected to the second flange inlet pipe 1, and the other end of the heat-conducting pipe 10 is fixedly connected to the second flange outlet pipe 8. This arrangement forms an efficient water circulation path, allowing cold water to circulate between the water tank 11 and the heat-conducting pipe 10, ensuring continuous absorption of heat from the exhaust gas, further improving heat recovery efficiency and the stability of heat transfer, and ensuring efficient and stable heat recovery. Multiple perforations are evenly opened on both sides of the heat-conducting box 3, and the heat-conducting pipe... The heat pipes 10 are arranged in a serpentine pattern, passing through multiple perforations. Compared to the traditional straight-line arrangement, the serpentine heat pipe design increases the heat exchange area, effectively improving heat recovery efficiency, fully utilizing the heat energy in the exhaust gas, and reducing energy waste. The first filter block 15 is made of porous silicon carbide ceramic, and the second filter block 13 is made of coal-based columnar activated carbon. The combination of porous silicon carbide ceramic and coal-based columnar activated carbon fully leverages their advantages in high temperature resistance, high-strength interception, and high-efficiency adsorption, forming a multi-stage purification system that can effectively treat pollutants ranging from large particles to small particles and gaseous pollutants, greatly improving the comprehensiveness and effectiveness of exhaust gas purification.

[0021] Working Principle: In the application of this invention, high-temperature exhaust gas enters the heat-conducting box 3 through the first flange inlet pipe. Because the heat-conducting pipes 10 are arranged in a serpentine pattern and penetrate the perforations on both sides of the heat-conducting box 3, the contact area between the exhaust gas and the heat-conducting pipes 10 is significantly increased. At this time, cold water in the water tank 11 flows into the heat-conducting pipes 10 through the second flange inlet pipe 1, where it exchanges heat with the high-temperature exhaust gas. After absorbing the heat from the exhaust gas, the hot water flows out through the second flange outlet pipe 8 for subsequent production or domestic use, thus achieving exhaust gas heat recovery. In the exhaust gas purification stage, the exhaust gas after heat recovery enters the connecting pipe 4 through the outlet hopper 6 and then flows into the filter box 5. The exhaust gas first passes through the first filter block 15 on one side, whose porous silicon carbide ceramic material intercepts large particulate pollutants in the exhaust gas. Then it passes through the second filter block 13 on the same side, where coal-based columnar active... The activated carbon material adsorbs fine particulate pollutants as well as gaseous pollutants such as sulfides and nitrogen oxides. Subsequently, the exhaust gas enters a liquid storage chamber between the partition 17 and the bottom of the filter box 5. The purification liquid in the storage chamber is a sodium hydroxide (NaOH) aqueous solution with a concentration controlled between 10% and 20%, which can neutralize the acidic gases in the exhaust gas, effectively absorbing these gaseous pollutants. Afterward, the exhaust gas passes through the first filter block 15 and the second filter block 13 on the other side of the inner wall for secondary purification, further filtering and adsorbing the remaining pollutants. After multiple purification processes, the exhaust gas that meets emission standards is directly discharged from the discharge pipe 7. Large particulate pollutants settled in the storage chamber and pollutants absorbed by the purification liquid can be cleaned periodically to ensure the purification effect. At this point, the device is in operation.

[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rotary kiln tail gas heat recovery device, comprising a heat conduction box (3), characterized in that: A water tank (11) is fixedly attached to one side of the heat conduction box (3). A first flange water inlet pipe (2) is fixedly attached to one end of the top surface of the water tank (11). A first flange water outlet pipe (16) is fixedly attached to one end of the bottom surface of the water tank (11). A heat conduction pipe (10) is provided inside the second flange water inlet pipe (1). A first flange air inlet pipe is fixedly attached to one end of the heat conduction box (3). An air outlet bucket (6) is installed at the other end of the heat conduction box (3). A first flange (9) is fixedly attached to the end of the air outlet bucket (6). A connecting pipe (4) is connected to the flange on the first flange (9). A filter assembly is fixedly attached to one end of the connecting pipe (4).

2. The rotary kiln tail gas heat recovery device according to claim 1, characterized in that: The filter assembly includes a filter box (5), on which a first filter block (15) is fixedly mounted on both inner walls. A second filter block (13) is mounted on the opposite surface of the first filter block (15). A partition (17) is fixedly mounted between the opposite surfaces of the second filter blocks (13). A liquid storage chamber is provided between the partition (17) and the bottom surface of the filter box (5). A partition plate is fixedly mounted on the bottom surface of the first filter block (15) and the second filter block (13). A discharge pipe (7) is connected and fixedly mounted at one end of the filter box (5).

3. The rotary kiln tail gas heat recovery device according to claim 2, characterized in that: A mounting frame (12) is fixedly connected to one end of the air outlet (6). A ring of mounting holes is evenly opened on one end face of the mounting frame (12). The heat conduction box (3) is located on one end face of the air outlet (6) and has multiple bolt holes corresponding to the mounting holes. A fixing bolt (14) passes through the mounting holes and the bolt holes.

4. The rotary kiln tail gas heat recovery device according to claim 3, characterized in that: A second flange water inlet pipe (1) is provided at one corner of the lower end of one side of the water tank (11). A second flange water outlet pipe (8) is provided diagonally opposite to the second flange water inlet pipe (1) on one side of the water tank (11). One end of the heat-conducting pipe (10) is fixedly connected to the second flange water inlet pipe (1), and the other end of the heat-conducting pipe (10) is fixedly connected to the second flange water outlet pipe (8).

5. The rotary kiln tail gas heat recovery device according to claim 4, characterized in that: The heat-conducting box (3) has multiple perforations evenly distributed on both sides, and the heat-conducting pipe (10) is arranged in a serpentine pattern and passes through the multiple perforations in sequence.

6. The rotary kiln tail gas heat recovery device according to claim 5, characterized in that: The first filter block (15) is made of porous silicon carbide ceramic, and the second filter block (13) is made of coal-based columnar activated carbon.

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