Heat recycling device of rotary kiln
The multi-level heat recovery and utilization device solves the problem of low heat utilization rate of rotary kiln exhaust gas, realizes efficient utilization of exhaust gas heat, reduces energy consumption, and provides electricity and domestic water for the plant.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU DONGHONG REFRACTORY CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-05-12
AI Technical Summary
In existing rotary kiln heat recovery equipment, the utilization rate of waste gas heat is low, resulting in resource waste and high energy consumption.
Design a multi-stage heat recovery and utilization device, including a first heat exchange box, a steam generator, and a second heat exchange box, to utilize the heat of waste gas through multiple heat exchanges to generate steam, hot water, and hot air for use within the plant.
It improved heat recovery efficiency, reduced production energy consumption, provided electricity and domestic water, and improved living conditions within the rotary kiln plant.
Smart Images
Figure CN224230734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rotary kiln heat recovery technology, specifically a rotary kiln heat recovery and utilization device. Background Technology
[0002] A rotary kiln is a common industrial piece of equipment primarily used for high-temperature processing and conversion of materials. It is a long, cylindrical container, usually placed horizontally and installed at a certain angle. Material enters the rotary kiln from one end, then gradually moves axially within the kiln and finally exits from the other end. The working principle of a rotary kiln is based on the heat treatment and conversion process of materials at high temperatures. By heating the material inside the rotary kiln, various processing effects such as drying, calcination, roasting, incineration, smelting, and gasification can be achieved. Rotary kilns have wide applications in industries such as building materials, metallurgy, and chemicals.
[0003] Rotary kilns generate waste gas during operation. This waste gas has a very high temperature. If it is not reused, it will lead to a waste of resources. Therefore, there are some waste heat recovery devices for the reuse of heat from rotary kilns in the existing technology.
[0004] However, most of the existing related equipment only utilizes heat in a relatively simple way. Since the heat of the exhaust gas is very high, only a portion of it is utilized. This results in incomplete utilization of the heat of the exhaust gas. Although it is utilized, the utilization rate is very low, and a large amount of heat remains unused. In view of this, in-depth research was conducted to address the above problems, which led to this case. Utility Model Content
[0005] The purpose of this invention is to provide a heat recovery and utilization device for a rotary kiln, so as to solve the problem of low heat recovery and utilization rate of the rotary kiln mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a heat recovery and utilization device for a rotary kiln, comprising a first heat exchange box, a first heat exchange component disposed inside the first heat exchange box, a steam generator disposed on one side of the first heat exchange box, a second heat exchange component disposed inside the steam generator, a second heat exchange box disposed on one side of the steam generator, a feeding box installed at the top of the second heat exchange box, and a third heat exchange component disposed inside the second heat exchange box;
[0007] The first heat exchange component includes a first exhaust pipe, which is disposed inside the first heat exchange box. The inlet end of the first exhaust pipe extends to the outside of the first heat exchange box and is equipped with a gas supply pipe. The outlet end of the first exhaust pipe extends to the outside of the first heat exchange box.
[0008] The second heat exchange component includes a second exhaust pipe, which is disposed inside the steam generator. The inlet of the second exhaust pipe is connected to the outlet of the first exhaust pipe, and the outlet of the second exhaust pipe extends to the outside of the steam generator.
[0009] An air inlet is provided on one side of the feeding box, and the air inlet of the feeding box is connected to the output end of the second exhaust pipe. An air outlet is provided on the other side of the feeding box, and an air guide pipe is installed at the air outlet of the feeding box. The air guide pipe is connected to the air inlet of the second heat exchange box.
[0010] Preferably, the first heat exchange assembly further includes a cold air duct, which is installed on one side of the top of the first heat exchange box. A return air duct is installed on the other side of the top of the first heat exchange box. Multiple first heat exchange plates are fixed on the outer wall of the first exhaust pipe inside the first heat exchange box. The first heat exchange plates are arranged in an alternating pattern inside the first heat exchange box. Both the front and rear ends of the first heat exchange plates are welded to the inner wall of the first heat exchange box. The top or bottom end of the first heat exchange plate is welded to the top or bottom end of the first heat exchange box.
[0011] Preferably, the second heat exchange assembly further includes a water supply valve pipe, which is installed on one side of the top of the steam generator, and a steam exhaust pipe is installed on the other side of the top of the steam generator.
[0012] Preferably, the third heat exchange component includes an S-shaped water pipe, which is located inside the second heat exchange box and extends to the outside of the second heat exchange box at both ends. Multiple second heat exchange plates are fixed to the outer wall of the water pipe, and a discharge pipe is installed on one side of the second heat exchange box.
[0013] Preferably, both the first exhaust pipe and the second exhaust pipe are S-shaped, and both are made of high-temperature resistant alloy pipe.
[0014] Preferably, the air inlet and air outlet of the feeding box are at the same height, and the horizontal distance between the air inlet and air outlet of the feeding box is slightly less than the length of the feeding box.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] By recycling the heat from the exhaust gas in multiple stages, not only can the energy consumption of rotary kiln production be reduced, but electricity and warm water can also be provided to the plant, thus improving the lives of the employees in the rotary kiln plant. The heat from the exhaust gas is fully utilized, and the heat recovery efficiency is significantly improved compared with existing technologies, making it more energy-efficient and environmentally friendly. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the workflow of this utility model;
[0018] Figure 2 This is a frontal cross-sectional view of the present invention.
[0019] In the diagram: 1. Cold air duct; 2. First heat exchanger; 3. First exhaust gas duct; 4. Gas supply pipe; 5. First heat exchange plate; 6. Return air duct; 7. Second exhaust gas duct; 8. Water supply valve pipe; 9. Steam generator; 10. Steam exhaust pipe; 11. Feed box; 12. Air guide pipe; 13. Discharge pipe; 14. Second heat exchanger; 15. Water supply pipe; 16. Second heat exchange plate Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Example: Please refer to Figure 1-2 A heat recovery and utilization device for a rotary kiln includes a first heat exchange box 2, a first heat exchange component is provided inside the first heat exchange box 2, a steam generator 9 is provided on one side of the first heat exchange box 2, a second heat exchange component is provided inside the steam generator 9, a second heat exchange box 14 is provided on one side of the steam generator 9, a feeding box 11 is installed on the top of the second heat exchange box 14, and a third heat exchange component is provided inside the second heat exchange box 14.
[0022] The first heat exchange assembly includes a first exhaust pipe 3, which is disposed inside the first heat exchange box 2. The inlet end of the first exhaust pipe 3 extends to the outside of the first heat exchange box 2 and is equipped with an exhaust pipe 4. The outlet end of the first exhaust pipe 3 extends to the outside of the first heat exchange box 2.
[0023] The second heat exchange assembly includes a second exhaust pipe 7, which is disposed inside the steam generator 9. The input end of the second exhaust pipe 7 is connected to the output end of the first exhaust pipe 3, and the output end of the second exhaust pipe 7 extends to the outside of the steam generator 9.
[0024] An air inlet is provided on one side of the feeding box 11, and the air inlet of the feeding box 11 is connected to the output end of the second exhaust pipe 7. An air outlet is provided on the other side of the feeding box 11, and an air guide pipe 12 is installed at the air outlet of the feeding box 11. The air guide pipe 12 is connected to the air inlet of the second heat exchange box 14.
[0025] Both the first exhaust pipe 3 and the second exhaust pipe 7 are S-shaped, and both the first exhaust pipe 3 and the second exhaust pipe 7 are made of high-temperature resistant alloy pipes.
[0026] Specifically, such as Figure 2 As shown, after the exhaust gas leaves the rotary kiln, it can be treated for dust removal using cyclone separators and dust collection filter bags. This technology is existing and serves as the pre-processing equipment for this device, though it is not directly mentioned in this paper. Subsequently, this portion of high-temperature exhaust gas is guided to the gas transmission pipe 4 of this device. Multiple heat exchanges occur at this device, achieving different levels of utilization.
[0027] The first heat exchange assembly also includes a cold air duct 1, which is installed on one side of the top of the first heat exchange box 2. A return air duct 6 is installed on the other side of the top of the first heat exchange box 2. Multiple first heat exchange plates 5 are fixed on the outer wall of the first exhaust pipe 3 inside the first heat exchange box 2. The first heat exchange plates 5 are arranged in an alternating pattern inside the first heat exchange box 2. Both the front and rear ends of the first heat exchange plates 5 are welded to the inner wall of the first heat exchange box 2. The top or bottom end of the first heat exchange plates 5 is welded to the top or bottom end of the first heat exchange box 2.
[0028] Specifically, such as Figure 1 and Figure 2 As shown, 450°C exhaust gas enters the first exhaust gas pipe 3 from the gas supply pipe 4. The interior of the first heat exchange box 2 is also filled with cold air that enters from the cold air pipe 1 and leaves the return air pipe 6. This cold air exchanges heat with the first exhaust gas pipe 3. The cold air leaving the return air pipe 6 can be heated to 380°C and supplied to the kiln head burner to reduce losses.
[0029] The second heat exchange assembly also includes a water supply valve pipe 8, which is installed on one side of the top of the steam generator 9, and a steam exhaust pipe 10 is installed on the other side of the top of the steam generator 9.
[0030] Specifically, such as Figure 1 and Figure 2 As shown, the exhaust gas entering the second exhaust gas pipe 7 from the first exhaust gas pipe 3 still carries a temperature of about 350°C, which can heat the water inside the steam generator 9 to form 0.8MPa saturated steam. This part of the steam can be transported from the steam exhaust pipe 10 to the steam turbine for power generation.
[0031] The air inlet and air outlet of the feeding box 11 are at the same height, and the horizontal distance between the air inlet and air outlet of the feeding box 11 is slightly less than the length of the feeding box 11.
[0032] Specifically, such as Figure 1 and Figure 2 As shown, the exhaust gas leaving from the second exhaust pipe 7 still has a temperature of about 220°C, which can be transported to the feeding box 11 to preheat the raw materials transported inside the feeding box 11. The feeding box 11 here is also a related device in the prior art, and its specific structure will not be described in detail in this device.
[0033] The third heat exchange assembly includes an S-shaped water pipe 15, which is located inside the second heat exchange box 14 and extends to the outside of the second heat exchange box 14 at both ends. Multiple second heat exchange plates 16 are fixed to the outer wall of the water pipe 15, and a discharge pipe 13 is installed on one side of the second heat exchange box 14.
[0034] Specifically, such as Figure 1 and Figure 2 As shown, the exhaust gas leaving the feed box 11 from the air duct 12 still has a temperature of about 120°C. This temperature can be transferred to the second heat exchange plate 16 to heat the water pipe 15 that runs through the second heat exchange plate 16, so that the temperature of the cold water inside the water pipe 15 rises to about 60°C. The water inside the water pipe 15 can be used for production and daily life in the factory.
[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A heat recovery and utilization device for a rotary kiln, comprising a first heat exchange box (2), characterized in that: The first heat exchange box (2) is provided with a first heat exchange component inside, and a steam generator (9) is provided on one side of the first heat exchange box (2). The steam generator (9) is provided with a second heat exchange component inside, and a second heat exchange box (14) is provided on one side of the steam generator (9). A feeding box (11) is installed on the top of the second heat exchange box (14). A third heat exchange component is provided inside the second heat exchange box (14). The first heat exchange assembly includes a first exhaust pipe (3), which is disposed inside the first heat exchange box (2), and the inlet end of the first exhaust pipe (3) extends to the outside of the first heat exchange box (2) and is equipped with a gas supply pipe (4), and the outlet end of the first exhaust pipe (3) extends to the outside of the first heat exchange box (2). The second heat exchange assembly includes a second exhaust pipe (7), which is located inside the steam generator (9). The input end of the second exhaust pipe (7) is connected to the output end of the first exhaust pipe (3), and the output end of the second exhaust pipe (7) extends to the outside of the steam generator (9). An air inlet is provided on one side of the feeding box (11), and the air inlet of the feeding box (11) is connected to the output end of the second exhaust pipe (7). An air outlet is provided on the other side of the feeding box (11), and an air guide pipe (12) is installed at the air outlet of the feeding box (11). The air guide pipe (12) is connected to the air inlet of the second heat exchange box (14).
2. The heat recovery and utilization device for a rotary kiln according to claim 1, characterized in that: The first heat exchange assembly also includes a cold air duct (1), which is installed on one side of the top of the first heat exchange box (2). A return air duct (6) is installed on the other side of the top of the first heat exchange box (2). Multiple first heat exchange plates (5) are fixed on the outer wall of the first exhaust pipe (3) inside the first heat exchange box (2). The first heat exchange plates (5) are arranged in an alternating pattern inside the first heat exchange box (2). The front and rear ends of the first heat exchange plates (5) are welded to the inner wall of the first heat exchange box (2). The top or bottom end of the first heat exchange plates (5) is welded to the top or bottom end of the first heat exchange box (2).
3. The heat recovery and utilization device for a rotary kiln according to claim 1, characterized in that: The second heat exchange assembly also includes a water supply valve pipe (8), which is installed on one side of the top of the steam generator (9), and a steam exhaust pipe (10) is installed on the other side of the top of the steam generator (9).
4. The heat recovery and utilization device for a rotary kiln according to claim 1, characterized in that: The third heat exchange component includes an S-shaped water pipe (15) located inside the second heat exchange box (14), with both ends of the water pipe (15) extending to the outside of the second heat exchange box (14). Multiple second heat exchange plates (16) are fixed to the outer wall of the water pipe (15), and a discharge pipe (13) is installed on one side of the second heat exchange box (14).
5. The heat recovery and utilization device for a rotary kiln according to claim 1, characterized in that: The first exhaust pipe (3) and the second exhaust pipe (7) are both S-shaped, and both the first exhaust pipe (3) and the second exhaust pipe (7) are made of high-temperature resistant alloy pipe.
6. The heat recovery and utilization device for a rotary kiln according to claim 1, characterized in that: The air inlet and outlet of the feeding box (11) are at the same height, and the horizontal distance between the air inlet and outlet of the feeding box (11) is slightly less than the length of the feeding box (11).