Waste heat recovery device of sintering circular cooler
By introducing a cascade utilization pipeline and a heat-resistant blower into the sintering ring cooler, the waste gas in the medium and low temperature section is recovered to the high temperature section for waste heat recovery, which solves the problem of the waste gas in the medium and low temperature section not being utilized and achieves higher waste heat recovery efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-03-10
AI Technical Summary
In existing technologies, the waste gas in the medium-low temperature section and the low temperature section with a temperature >200℃ during the iron ore sintering process is not effectively recovered, resulting in the waste of waste heat resources.
The waste gas from the medium and low temperature section is recirculated into the high temperature section through a cascaded pipeline and heat-resistant blower. Waste heat is recovered through a ring-cooled waste heat boiler, and a vent valve is installed at the connection of the circulation pipeline to prevent excessive pressure.
It improved the waste heat recovery efficiency, increased the amount of steam recovered, and improved the waste heat recovery efficiency by 31.6%, thus preventing production accidents.
Smart Images
Figure CN223985592U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste heat recovery technology in iron ore sintering, and more specifically, to a waste heat recovery device for a sintering ring cooler. Background Technology
[0002] Currently, the cooling of finished sintered ore in the iron ore sintering process mostly adopts the method of sintering ring cooler, and the waste heat of the medium and high temperature section of the exhaust gas generated during the cooling process is recovered and utilized. Due to the limitation of waste heat recovery efficiency, currently only the medium and high temperature section exhaust gas with temperature >300℃ is usually recovered. The medium and low temperature section exhaust gas with temperature >200℃ and ≤300℃ and the low temperature section exhaust gas with temperature ≤200℃ are generally discharged into the air by direct exhaust, resulting in a large waste of waste heat resources.
[0003] Therefore, how to provide a waste heat recovery device that can completely recover and utilize waste gas with a temperature >200℃ is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0004] In view of the above problems, this application provides a waste heat recovery device for sintering ring coolers, which can include all waste gas with a temperature >200°C in the waste heat recovery process, thereby significantly improving the waste heat recovery efficiency of sintering ring coolers.
[0005] This application provides a waste heat recovery device for a sintering ring cooler, comprising: a sintering ring cooler, a ring cooler waste heat boiler, a ring cooler circulating fan, and a heat-resistant blower; wherein, the sintering ring cooler includes a high-temperature section, a medium-temperature section, a medium-low temperature section, and a low-temperature section; the high-temperature section is provided with a high-temperature section inlet, a high-temperature section outlet, and a high-temperature section flue gas hood for containing high-temperature section waste gas; the medium-temperature section is provided with a medium-temperature section inlet, a medium-temperature section outlet, and a medium-temperature section flue gas hood for containing medium-low temperature section waste gas; the medium-low temperature section is provided with a medium-low temperature section inlet, a medium-low temperature section outlet, and a medium-low temperature section flue gas hood for containing medium-low temperature section waste gas; the low-temperature section is provided with a low-temperature section outlet and a low-temperature section flue gas hood for containing low-temperature section waste gas; the high-temperature section waste heat recovery device includes a high-temperature section inlet, a medium-low temperature section outlet, and a medium-low temperature section flue gas hood for containing medium-low temperature section waste gas; the low-temperature section waste heat recovery device includes a high-temperature section inlet, a medium-low temperature section outlet, and a medium-low temperature section flue gas hood for containing low-temperature section waste gas; the high ... low-temperature section waste heat recovery device includes a high-temperature section waste heat recovery device, a medium-temperature section outlet, and a medium-low temperature section flue gas hood for containing low-temperature section waste gas; the high-temperature section waste heat recovery device includes a high-temperature section outlet The temperature of the exhaust gas in the high-temperature section is >400℃, and the temperature of the exhaust gas in the medium-temperature section is >300℃ and ≤400℃. The outlets of the high-temperature section and the medium-temperature section are connected to the annular cooling waste heat boiler through high-temperature circulation pipes and medium-temperature circulation pipes, respectively. After waste heat recovery in the annular cooling waste heat boiler, the exhaust gas in the high-temperature section and the exhaust gas in the medium-temperature section are returned to the inlet of the medium-temperature section and the inlet of the medium-low temperature section through the annular cooling circulation fan. The temperature of the exhaust gas in the medium-low temperature section is >200℃ and ≤300℃. The outlet of the medium-low temperature section is connected to the heat-resistant blower through a cascade utilization pipe. The exhaust gas in the medium-low temperature section is returned to the inlet of the high-temperature section through the heat-resistant blower. The temperature of the exhaust gas in the low-temperature section is ≤200℃. The exhaust gas in the low-temperature section is naturally released through the outlet of the low-temperature section.
[0006] Optionally, a high-temperature section exhaust gas venting valve is provided at the connection between the high-temperature circulation pipeline and the high-temperature section outlet, a medium-temperature section exhaust gas venting valve is provided at the connection between the medium-temperature circulation pipeline and the medium-temperature section outlet, and a medium-low temperature section exhaust gas venting valve is provided at the connection between the cascade utilization pipeline and the medium-low temperature section outlet.
[0007] Optionally, the heat-resistant blower is designed to withstand temperatures of 200℃-300℃ and to withstand total pressures of 3.0kPa-4.0kPa.
[0008] Optionally, the heat-resistant blower is designed to withstand a heat temperature of 220℃ and a total pressure of 3.1 kPa.
[0009] Optionally, the flow velocity of the medium- and low-temperature exhaust gas in the cascade utilization pipeline is 15 m / s to 25 m / s.
[0010] Optionally, the inner or outer wall of the cascade utilization pipeline is provided with an insulation layer, so that the cooling rate of the medium and low temperature exhaust gas in the cascade utilization pipeline is <1.5℃ / m.
[0011] Optionally, the sintering ring cooler has a capacity of 320m². 2 The temperature of the exhaust gas in the high-temperature section is 450℃, the temperature of the exhaust gas in the medium-low temperature section is 220℃, and the steam recovery capacity of the annular cooling waste heat boiler is 50 tons / hour.
[0012] Compared with the prior art, the waste heat recovery device for the sintering ring cooler provided in this application has the following advantages:
[0013] 1) Compared with the existing waste heat recovery devices that can only recover waste gas from the medium and high temperature section with a temperature >300℃, the waste heat recovery device for the sintering ring cooler provided in this application uses pipelines and heat-resistant blowers to reintroduce the waste gas from the medium and low temperature section of the sintering ring cooler with a temperature >200℃ and ≤300℃ into the high temperature section of the sintering ring cooler. This waste gas is then combined with the waste gas from the high temperature section to undergo the waste heat recovery process of the ring cooler waste heat boiler, thereby recovering the waste heat from the waste gas from the medium and low temperature section and improving the waste heat recovery efficiency.
[0014] 2) With a scale of 320m 2 Taking the sintering ring cooler as an example, the ring cooler waste heat boiler in the waste heat recovery device that only recovers waste gas in the medium and high temperature section with a temperature >300℃ has a steam recovery capacity of about 38 tons / hour, while the ring cooler waste heat boiler in the waste heat recovery device that recovers all waste gas with a temperature >200℃ provided in this application has a steam recovery capacity of about 50 tons / hour, and the waste heat recovery efficiency is increased by 31.6%.
[0015] 3) The waste heat recovery device for the sintering ring cooler provided in this application is equipped with a vent valve at each connection of the circulation pipeline. When the waste gas circulation is unstable, the vent valve can be opened to discharge the waste gas out of the flue gas hood, so as to avoid the waste gas in the flue gas hood from accumulating continuously and increasing the pressure, which could lead to production accidents. Attached Figure Description
[0016] To more clearly illustrate the technical solution of this application, the embodiments of this application will be further explained and described with reference to the following drawings. These drawings are only used to more conveniently and specifically describe the embodiments of this application and are not intended to limit this application.
[0017] Figure 1 This is a structural schematic diagram of a conventional sintering ring cooler waste heat recovery device, depicted from a top-down view of the sintering ring cooler; and
[0018] Figure 2A and Figure 2B This is a schematic diagram of the structure of a waste heat recovery device for a sintering ring cooler according to an exemplary embodiment of this application; wherein... Figure 2A This is a schematic diagram of the waste heat recovery device for the sintering ring cooler, drawn from a top-down view. Figure 2B This is a schematic diagram of the waste heat recovery device of the sintered ring cooler, depicted from the perspective of circumferential disassembly of the sintered ring cooler.
[0019] In the diagram: 100 is the sintering ring cooler, 200 is the ring cooler waste heat boiler, 300 is the ring cooler circulating fan, and 400 is the heat-resistant blower; 101 is the high-temperature section, 102 is the medium-temperature section, 103 is the medium-low temperature section, 104 is the low-temperature section, 111 is the high-temperature section flue gas hood, 112 is the medium-temperature section flue gas hood, 113 is the medium-low temperature section flue gas hood, and 114 is the low-temperature section flue gas hood; 501 is the high-temperature circulating pipeline, 502 is the medium-temperature circulating pipeline, and 503 is the cascade utilization pipeline; 601 is the high-temperature section exhaust gas vent valve, 602 is the medium-temperature section exhaust gas vent valve, and 603 is the medium-low temperature section exhaust gas vent valve. Detailed Implementation
[0020] This application provides a waste heat recovery device for a sintering ring cooler, which has a simple structure and can recover and utilize the waste heat of all exhaust gas with a temperature >200℃, with high waste heat recovery efficiency.
[0021] Existing waste heat recovery devices typically only recover waste gas from the high-temperature and medium-temperature sections (temperatures >300℃) of the sintering ring cooler. Waste gas from the medium-low temperature and low-temperature sections (temperatures ≤300℃) is naturally released into the atmosphere due to its lower temperature and lower recovery efficiency, resulting in partial loss of waste heat. (Reference) Figure 1 , Figure 1 This is a schematic diagram of a conventional waste heat recovery device for sintering ring coolers in existing technology. (Example:) Figure 1As shown, a conventional sintering ring cooler waste heat recovery device includes: a sintering ring cooler 100, a ring cooler waste heat boiler 200, and a ring cooler circulating fan 300; wherein, the sintering ring cooler 100 includes a high-temperature section 101, a medium-temperature section 102, a medium-low temperature section 103, and a low-temperature section 104, each section being separated by corresponding partitions; the high-temperature section 101 is equipped with a high-temperature section inlet, a high-temperature section outlet, and a high-temperature section flue hood 111 for containing high-temperature section exhaust gas; the medium-temperature section 102 is equipped with a medium-temperature section inlet, a medium-temperature section outlet, and a medium-temperature section flue hood 112 for containing medium-temperature section exhaust gas; the medium-low temperature section 103 is equipped with a medium-low temperature section outlet and a medium-low temperature section flue hood 113 for containing medium-low temperature section exhaust gas; and the low-temperature section 104 is equipped with a low-temperature section outlet and a low-temperature section flue hood 113 for containing low-temperature section exhaust gas. The exhaust gas in the high-temperature section is hooded in the low-temperature section (114); the exhaust gas temperature in the high-temperature section is >400℃, and the exhaust gas temperature in the medium-temperature section is >300℃ and ≤400℃. The outlets of the high-temperature section and the medium-temperature section are connected to the annular cooling waste heat boiler 200 through high-temperature circulation pipe 501 and medium-temperature circulation pipe 502, respectively. After waste heat recovery in the annular cooling waste heat boiler 200, the exhaust gas in the high-temperature section and the medium-temperature section are returned to the inlet of the high-temperature section and the inlet of the medium-temperature section through the annular cooling circulation fan 300 (for example, the exhaust gas is led to different inlets through branch pipes); the exhaust gas temperature in the medium-low temperature section is >200℃ and ≤300℃, and the exhaust gas in the medium-low temperature section is naturally discharged through the outlet of the medium-low temperature section; the exhaust gas temperature in the low-temperature section is ≤200℃, and the exhaust gas in the low-temperature section is naturally discharged through the outlet of the low-temperature section. Figure 1 As shown, existing waste heat recovery devices only recover waste heat from high-temperature and medium-temperature waste gases, while waste heat from medium-low temperature and low-temperature waste gases is not recovered.
[0022] This application provides a waste heat recovery device for a sintering ring cooler that can recover waste heat not only from high-temperature (>300℃) and medium-temperature (>300℃) waste gas, but also efficiently from medium-low temperature (>200℃) waste gas and ≤300℃ waste gas. (Reference) Figure 2A and Figure 2BThe waste heat recovery device for the sintering ring cooler provided in this application may include: a sintering ring cooler 100, a ring cooler waste heat boiler 200, a ring cooler circulating fan 300, and a heat-resistant blower 400; wherein, the sintering ring cooler 100 includes a high-temperature section 101, a medium-temperature section 102, a medium-low temperature section 103, and a low-temperature section 104, each section being separated by corresponding partitions; the high-temperature section 101 is provided with a high-temperature section inlet, a high-temperature section outlet, and a high-temperature section flue hood 111 for containing high-temperature section exhaust gas; the medium-temperature section 102 is provided with a medium-temperature section inlet, a medium-temperature section outlet, and a medium-temperature section flue hood 112 for containing medium-temperature section exhaust gas; the medium-low temperature section 103 is provided with a medium-low temperature section inlet, a medium-low temperature section outlet, and a medium-low temperature section flue hood 113 for containing medium-low temperature section exhaust gas; and the low-temperature section 104 is provided with a low-temperature section outlet and a low-temperature section for containing low-temperature section exhaust gas. The flue gas hood 114 is used for the exhaust gas. The temperature of the high-temperature section exhaust gas is >400℃, and the temperature of the medium-temperature section exhaust gas is >300℃ and ≤400℃. The outlets of the high-temperature section and the medium-temperature section are connected to the annular cooling waste heat boiler 200 through the high-temperature circulation pipe 501 and the medium-temperature circulation pipe 502, respectively. After the high-temperature section exhaust gas and the medium-temperature section exhaust gas undergo waste heat recovery in the annular cooling waste heat boiler 200, they are returned to the medium-temperature section inlet and the medium-low temperature section inlet through the annular cooling circulation fan 300 (for example, the exhaust gas is led to different inlets through branch pipes). The temperature of the medium-low temperature section exhaust gas is >200℃ and ≤300℃. The outlet of the medium-low temperature section is connected to the heat-resistant blower 400 through the stepped utilization pipe 503. The medium-low temperature section exhaust gas is returned to the high-temperature section inlet through the heat-resistant blower 400. The temperature of the low-temperature section exhaust gas is ≤200℃. The low-temperature section exhaust gas is naturally discharged through the low-temperature section outlet. Based on the above structure: the high-temperature section exhaust gas with a temperature >400℃ and the medium-temperature section exhaust gas with a temperature >300℃ and ≤400℃ are respectively connected to the annular cooling waste heat boiler 200 through the high-temperature circulation pipe 501 and the medium-temperature circulation pipe 502 for waste heat recovery and are circulated in the sintering annular cooler 100 by the annular cooling circulation fan 300; the medium-low temperature section exhaust gas with a temperature >200℃ and ≤300℃ is connected to the heat-resistant blower 400 through the stepped utilization pipe 503 and is returned to the high-temperature section 101 by the heat-resistant blower 400 to complete the circulation in the sintering annular cooler 100. The medium-low temperature section exhaust gas entering the high-temperature section 101 will undergo the above-mentioned waste heat recovery process together with the high-temperature section exhaust gas, and thus the waste heat in the medium-low temperature section exhaust gas can be recovered.
[0023] In a preferred embodiment of this application, each circulation pipe connection of the sintering ring cooler waste heat recovery device is further provided with a vent valve, for example, as shown in the reference. Figure 2B .like Figure 2BAs shown, a high-temperature section exhaust gas venting valve 601 is installed at the connection between the high-temperature circulation pipeline 501 and the high-temperature section outlet, a medium-temperature section exhaust gas venting valve 602 is installed at the connection between the medium-temperature circulation pipeline 502 and the medium-temperature section outlet, and a medium-low temperature section exhaust gas venting valve 603 is installed at the connection between the cascade utilization pipeline 503 and the medium-low temperature section outlet. When the exhaust gas circulation in any circulation pipeline is unstable, the venting valve at the connection of the pipeline can be opened to discharge the exhaust gas from the flue gas hood, so as to avoid production accidents caused by the continuous accumulation of exhaust gas in the flue gas hood and the increase in pressure.
[0024] In a preferred embodiment of this application, the heat-resistant blower 400 is designed to withstand temperatures of 200°C-300°C, which is not lower than the actual temperature of the exhaust gas in the medium-low temperature range. The heat-resistant blower 400 is designed to withstand a total pressure of 3.0 kPa-4.0 kPa, so as to provide sufficient power for the exhaust gas in the medium-low temperature range and ensure stable circulation of the exhaust gas in the cascade utilization pipeline 503. In a specific embodiment, the heat-resistant blower 400 is designed to withstand temperatures of 220°C and has a designed total pressure of 3.1 kPa; correspondingly, in this case, the temperature of the exhaust gas in the medium-low temperature range does not exceed 220°C.
[0025] In a preferred embodiment of this application, the flow velocity of the medium- and low-temperature exhaust gas within the cascade utilization pipe 503 is 15 m / s to 25 m / s, ensuring rapid and stable circulation of the exhaust gas throughout the sintering ring cooler 100 without excessive heat loss. Accordingly, the cascade utilization pipe 503 has a suitable diameter and is made of a high-temperature and high-pressure resistant material (e.g., carbon steel) to ensure it can withstand the flow of 200°C-300°C medium- and low-temperature exhaust gas at 15 m / s-25 m / s. In a further preferred embodiment, the inner or outer wall of the cascade utilization pipe 503 is provided with an insulation layer, ensuring that the cooling rate of the medium- and low-temperature exhaust gas within the cascade utilization pipe 503 is <1.5°C / m, thereby minimizing the loss of waste heat that should be further recovered during the circulation of the medium- and low-temperature exhaust gas. The insulation layer can be made of a suitable heat-resistant material. For example, when the insulation layer is installed on the inner wall of the stepped utilization pipe 503, the insulation layer can be a calcium silicate board; when the insulation layer is installed on the outer wall of the stepped utilization pipe 503, the insulation layer can be a rock wool felt.
[0026] In a preferred embodiment of this application, the sintering ring cooler 100 has a size of 320m. 2 The temperature of the high-temperature section exhaust gas is 450℃, and the temperature of the medium-low temperature section exhaust gas is 220℃. At this time, the steam recovery capacity of the annular cooling waste heat boiler 200 is 50 tons / hour. When other conditions are the same, a conventional sintering annular cooler waste heat recovery device that only recovers the high-temperature section exhaust gas (temperature >300℃) and the medium-temperature section exhaust gas (e.g., Figure 1The steam recovery capacity of the annular cooler waste heat recovery device (shown in the example) is only 38 tons / hour, while the waste heat recovery efficiency of the annular cooler waste heat recovery device provided in this application is improved by 31.6%. 2 up to 600m 2 Furthermore, the temperature in each section of the sintering ring cooler 100 can have various specific values within its range. However, those skilled in the art will understand that, under the same conditions, the waste heat recovery device for the sintering ring cooler provided in this application can additionally recover the waste heat of the exhaust gas in the medium and low temperature range, thereby achieving higher waste heat recovery efficiency.
[0027] For simplicity and ease of understanding, some conventional components of the sintering ring cooler 100 (e.g., feed inlet, cooler, transmission device, ash hopper, etc.) are not shown in this application. However, those skilled in the art will understand that the sintering ring cooler 100 provided in this application can have the general structure of conventional sintering ring coolers in the prior art. Furthermore, when referring to numerical values or numerical ranges, the numerical values or numerical ranges in this application should be understood as approximate values that include statistical errors and experimental variability.
[0028] It should be understood that the devices and / or structures in the various embodiments provided in this application can be combined, modified, and / or altered to form new technical solutions. Without inventive effort, these technical solutions should also be included within the scope of protection claimed in this application.
[0029] Numerous specific examples are provided in the embodiments described herein. It should be understood that these examples are for the purpose of elaborating on the implementation of this application in detail and are not intended to limit the scope of this application. The embodiments in this application can be practiced without these specific examples. In some embodiments, structures and / or techniques well known to those skilled in the art are not shown in detail so as not to obscure the understanding of this application.
[0030] While preferred embodiments of the present application have been shown and described herein, it will be readily understood by those skilled in the art that these embodiments are provided by way of example only. Various variations, modifications, and substitutions will occur to those skilled in the art without departing from the present application. It should be understood that various alternatives to the embodiments of the present application described herein are optionally used to implement the present application. The scope of the present application is intended to be defined by the claims, and thereby to cover apparatuses, structures, and equivalents thereof within the scope of these claims.
Claims
1. A sintering ring cooler waste heat recovery device characterized by, Comprising: a sintering ring cooler (100), a ring cooling waste heat boiler (200), a ring cooling circulating fan (300) and a heat-resistant blower (400); wherein the sintering ring cooler (100) comprises a high-temperature section (101), a medium-temperature section (102), a medium-low-temperature section (103) and a low-temperature section (104), the high-temperature section (101) is provided with a high-temperature section inlet, a high-temperature section outlet and a high-temperature section flue gas cover (111) for containing high-temperature section exhaust gas, the medium-temperature section (102) is provided with a medium-temperature section inlet, a medium-temperature section outlet and a medium-temperature section flue gas cover (112) for containing medium-temperature section exhaust gas, the medium-low-temperature section (103) is provided with a medium-low-temperature section inlet, a medium-low-temperature section outlet and a medium-low-temperature section flue gas cover (113) for containing medium-low-temperature section exhaust gas, and the low-temperature section (104) is provided with a low-temperature section outlet and a low-temperature section flue gas cover (114) for containing low-temperature section exhaust gas; the temperature of the high-temperature section exhaust gas is >400℃, the temperature of the medium-temperature section exhaust gas is >300℃ and ≤400℃, the high-temperature section outlet and the medium-temperature section outlet are respectively connected to the ring cooling waste heat boiler (200) through high-temperature circulating pipelines (501) and medium-temperature circulating pipelines (502), and the high-temperature section exhaust gas and the medium-temperature section exhaust gas are returned to the medium-temperature section inlet and the medium-low-temperature section inlet through the ring cooling circulating fan (300) after undergoing waste heat recovery in the ring cooling waste heat boiler (200); the temperature of the medium-low-temperature section exhaust gas is >200℃ and ≤300℃, the medium-low-temperature section outlet is connected to the heat-resistant blower (400) through a cascade utilization pipeline (503), and the medium-low-temperature section exhaust gas is returned to the high-temperature section inlet through the heat-resistant blower (400); the temperature of the low-temperature section exhaust gas is ≤200℃, and the low-temperature section exhaust gas is naturally dissipated through the low-temperature section outlet.
2. The sintering ring cooler waste heat recovery device according to claim 1, wherein the high-temperature section exhaust gas dissipation valve (601) is arranged at the connection between the high-temperature circulating pipeline (501) and the high-temperature section outlet, the medium-temperature section exhaust gas dissipation valve (602) is arranged at the connection between the medium-temperature circulating pipeline (502) and the medium-temperature section outlet, and the medium-low-temperature section exhaust gas dissipation valve (603) is arranged at the connection between the cascade utilization pipeline (503) and the medium-low-temperature section outlet.
3. The sintering ring cooler waste heat recovery device according to claim 1, wherein the design heat-resistant temperature of the heat-resistant blower (400) is 200℃-300℃, and the design total pressure is 3.0kPa-4.0kPa.
4. The sintering ring cooler waste heat recovery device according to claim 3, wherein the design heat-resistant temperature of the heat-resistant blower (400) is 220℃, and the design total pressure is 3.1kPa.
5. The sintering ring cooler waste heat recovery device according to claim 1, wherein the flow rate of the medium-low-temperature section exhaust gas in the cascade utilization pipeline (503) is 15m / s to 25m / s.
6. The sintering ring cooler waste heat recovery device according to claim 1, wherein The step utilizes the inner wall or outer wall of the pipeline (503) to be provided with a heat preservation layer, so that the temperature drop rate of the medium-low temperature section exhaust gas in the step utilization pipeline (503) is <1.5 ℃ / m.
7. The sinter ring cooler waste heat recovery device according to claim 1, characterized in that, The scale of the sintering ring cooling machine (100) is 320m 2 , the temperature of the high-temperature section exhaust gas is 450℃, the temperature of the medium-low temperature section exhaust gas is 220℃, and the steam recovery amount of the ring cooling waste heat boiler (200) is 50 tons / hour.