Transfer system for hot delivery of oxidized pellets for direct reduction to hydrogen-based shaft furnace
The ring cooler and the heat-insulating transfer system solve the problem of heat loss of high-temperature oxidized pellets, realize the hot transfer and waste heat utilization of oxidized pellets, and improve the thermal efficiency and environmental protection of pellet production.
Patent Information
- Application Number
- CN202422701944.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-06
AI Technical Summary
In the existing technology, high-temperature oxidation pellets suffer from severe heat loss during transportation, resulting in reduced thermal efficiency of the pelletizing process. It is necessary to develop a transportation system that can effectively prevent heat loss.
The hot transfer of high-temperature oxidized pellets is achieved by adopting components such as ring coolers, hot-charged transport vehicles, hydrogen-based vertical furnace buffer bins and quantitative feeding belt conveyors, combined with thermal insulation design. It includes a two-stage medium and high-temperature ring cooler, thermal insulation cover and lining materials to ensure the effective use of heat.
The continuous transportation of oxidized pellets under hot conditions is realized, the efficiency of waste heat utilization is improved, the extra heat energy consumption is reduced, the environmental protection goals of energy saving and carbon reduction are achieved, and the efficient and continuous operation of pellet production is realized.
Smart Images
Figure CN223422706U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a heat transport system, in particular to a transfer system for hot transporting oxidation pellets for direct reduction to a hydrogen-based vertical furnace. Background Art
[0002] Currently, oxidized pellets for hydrogen-based shaft furnace production are produced using a chain grate-rotary kiln method, a shaft furnace method, or a belt roaster method. These pellets are cooled to room temperature by air cooling, stored in silos, and then loaded into the shaft furnace roof via a conveyor belt and a material hoist. As a result, much of the high-value heat contained in the hot oxidized pellets (typically 900°C to 1100°C) is converted into low-value hot water, steam, or ambient heat, reducing the thermal efficiency of the pelletizing process. Therefore, the development of a transfer system for hot delivery of oxidized pellets for direct reduction to the hydrogen-based shaft furnace is essential. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a transfer system for hot-transferring oxidized pellets for direct reduction to a hydrogen-based vertical furnace, which can effectively prevent heat loss of high-temperature oxidized pellets.
[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: it includes a ring cooler, a hot charging transport vehicle, a hydrogen-based vertical furnace buffer bin, a quantitative feeding belt conveyor and a vertical lifting device; the ring cooler is connected to the hydrogen-based vertical furnace buffer bin through the hot charging transport vehicle, the hydrogen-based vertical furnace buffer bin is connected to the vertical lifting device through the quantitative feeding belt conveyor, and the vertical lifting device is connected to the pellet inlet of the hydrogen-based vertical furnace; the ring cooler is a two-stage medium and high temperature ring cooler, including a ring cooling buffer bin and a normal unloading chute, and the ring cooling buffer bin and the normal unloading chute are both provided with insulation; the hot charging transport vehicle is provided with a silo, and the silo is provided with insulation; the hydrogen-based vertical furnace buffer bin is provided with insulation; the quantitative feeding belt conveyor is provided with a sealed insulation cover.
[0005] Furthermore, the inner layer of the ring-cooled buffer bin is made of wear-resistant surfacing material, and the outer layer of the bin is made of thermal insulation material; the normal unloading chute is provided with an insulation cover.
[0006] Furthermore, the silo includes a silo body and a sealed silo cover, and the silo body is provided with an inner lining; the inner layer of the inner lining is an impact-resistant wear-resistant surfacing material, and the outer layer of the inner lining is a thermal insulation material; the inner part of the sealed silo cover is provided with thermal insulation material.
[0007] Furthermore, the hydrogen-based vertical furnace buffer bin is provided with an inner lining; the inner layer of the inner lining is an impact-resistant wear-resistant surfacing material, and the outer layer is a thermal insulation material.
[0008] The beneficial effects produced by the above technical scheme are that the two-section high-medium temperature ring cooling machine is adopted, and each device for hot feeding is insulated, so that the hot charging and hot feeding of oxidized pellets under a hot state condition are realized, and the temperature of the hot-state pellets entering the hydrogen-based shaft furnace is 100-400 DEG C. The present application prevents heat loss of high-temperature oxidized pellets, returns as much residual heat in the hot-state oxidized pellets as possible to the main process of steel metallurgy directly, improves the residual heat utilization efficiency of the oxidized pellets, reduces the additional heat supplement required by the hydrogen-based shaft furnace, and further realizes energy saving and carbon reduction in the direct reduced iron production process, so as to achieve the environmental protection and high efficiency goals. The present application can realize continuous operation of the pellet-hydrogen-based shaft furnace production, realize the recycling of heat in the low-temperature section of the pellet production ring cooling, and reduce the consumption of external heat sources by the hydrogen-based shaft furnace. BRIEF DESCRIPTION OF DRAWINGS
[0009] The present application will be further described in detail below in combination with the drawings and specific embodiments.
[0010] Figure 1 is a structural schematic view of the present application.
[0011] In the figure: 1 - ring cooling machine cooling section 1; 2 - ring cooling machine cooling section 2; 3 - ring cooling buffer bin; 4 - emergency discharge control valve; 5 - emergency discharge chute; 6 - normal discharge chute; 7 - hot charging transport vehicle; 8 - hydrogen-based shaft furnace buffer bin; 9 - regulating gate; 10 - quantitative feeding belt conveyor; 11 - high-temperature hot feeding belt; 12 - back-and-forth hopper; 13 - vertical lifting device. DETAILED DESCRIPTION
[0012] Figure 1 As shown, the direct reduction oxidized pellet hot feeding system to the hydrogen-based shaft furnace includes a ring cooler, a hot charging transport vehicle 7, a hydrogen-based shaft furnace buffer bin 8, a quantitative feeding belt conveyor 10 and a vertical lifting device 13; the ring cooler is connected with the hydrogen-based shaft furnace buffer bin 8 through the hot charging transport vehicle 7, the hydrogen-based shaft furnace buffer bin 8 is connected with the vertical lifting device 13 through the quantitative feeding belt conveyor 10, and the vertical lifting device 13 is connected with the pellet inlet of the hydrogen-based shaft furnace.
[0013] Figure 1As shown, the transfer system for hot direct reduction oxidized pellets to a hydrogen-based vertical furnace comprises a two-stage, medium- and high-temperature ring cooler, which eliminates the low-temperature section compared to conventional three-stage ring coolers. The ring cooler comprises a first cooling section 1, a second cooling section 2, a ring cooling buffer bin 3, and a normal discharge chute 6. The first cooling section 1 is provided with a receiving opening at the top for receiving the roasted high-temperature roasted pellets. The first cooling section 1 is provided with a blast-type air cooling device at the bottom and a ring cooling high-temperature gas collection hood at the top. The second cooling section 2 receives the high-temperature pellets from the first cooling section. The second cooling section 2 is provided with a blast-type air cooling device at the bottom and a ring cooling high-temperature gas collection hood at the top. A ring-cooled discharge chute system is installed at the end of the second cooling section 2 of the ring-cooled machine. The ring-cooled discharge chute system includes a ring-cooled buffer bin 3 and a discharge chute. The ring-cooled buffer bin 3 receives hot pellets from the second cooling section 2 of the ring-cooled machine. The discharge chute includes an emergency discharge chute 5 and a normal discharge chute 6. The emergency discharge chute 5 is equipped with an emergency discharge control valve 4, and the normal discharge chute 6 is equipped with a normal discharge control valve. The ring-cooled buffer bin 3 is equipped with insulation. The insulation structure is as follows: the inner layer of the ring-cooled buffer bin 3 is wear-resistant cladding material, and the outer layer of the bin is thermal insulation material. The normal discharge chute 6 is equipped with insulation. The insulation structure is as follows: the normal discharge chute 6 is provided with an insulation cover.
[0014] Figure 1 As shown, the present invention is a transfer system for hot-delivering oxidized pellets for direct reduction to a hydrogen-based vertical furnace. The hot-charged transport vehicle 7 is provided with a silo, which includes a silo body and a sealed silo cover. The silo is provided with insulation, and the insulation structure is as follows: the silo body is provided with an inner lining; the inner layer of the inner lining is an impact-resistant wear-resistant surfacing material, and the outer layer of the inner lining is a thermal insulation material; the inner portion of the silo cover is sealed and provided with thermal insulation material.
[0015] Figure 1 As shown, the present invention provides a transfer system for hot delivery of oxidized pellets for direct reduction to a hydrogen-based vertical furnace. The outlet of the hydrogen-based vertical furnace buffer bin 8 is provided with an adjusting gate 9 to control the discharge flow. The hydrogen-based vertical furnace buffer bin 8 is provided with insulation. The insulation structure is as follows: the hydrogen-based vertical furnace buffer bin 8 is provided with an inner lining. The inner layer of the inner lining is an impact-resistant wear-resistant surfacing material, and the outer layer is a thermal insulation material. The top sealing cover is provided with an inner thermal insulation lining. The circular cylinder of this buffer bin is made of Q235B-Q345B / C / D / E steel plates.
[0016] Figure 1 As shown, the transfer system for hot-delivering the oxidized pellets for direct reduction to the hydrogen-based vertical furnace is characterized in that the quantitative feeding belt conveyor 10 is a variable frequency speed-regulating quantitative feeding belt conveyor, and the heat-resistant conveying belt 11 of the quantitative feeding belt conveyor 10 can withstand temperatures of 600°C and below; the quantitative feeding belt conveyor 10 is provided with a sealed heat-insulating cover.
[0017] Figure 1 As shown, the present invention is a transfer system for hot-transferring oxidation pellets for direct reduction to a hydrogen-based vertical furnace. The vertical lifting device 13 is provided with a reciprocating hopper 12, and the reciprocating hopper 12 has a heat-resistant temperature of up to 500°C.
[0018] Figure 1 As shown, the components of the high-temperature oxidized pellets transported by the transfer system for hot delivery of oxidized pellets for direct reduction to the hydrogen-based vertical furnace are iron-containing raw materials and auxiliary materials such as iron ore powder, composite binder, dust ash and return ore. After the components are mixed, water is added to the disc pelletizer to make balls to form green balls; the green balls are sieved to screen out qualified green balls with a particle size of 8mm to 16mm; the qualified green balls are preheated and then enter the roasting kiln, where they are roasted and oxidized at a temperature of 1250±20℃ to produce finished oxidized pellets; the mass ratio of the iron ore powder, composite binder, dust ash and return ore is 92:1.2:5:1.8. The steps of using this transfer system to produce the finished oxidized pellets are as follows:
[0019] 1) High-temperature oxidized pellets at 900°C to 1100°C are discharged through an inclined chute into a ring cooler. After being cooled by two high-temperature blast cooling methods, namely the first cooling stage 1 and the second cooling stage 2, the pellets are cooled to a temperature of 400°C to 600°C. They then enter the ring cooling buffer bin 3 and are then transported to the silo of the hot-charged transport vehicle 7 via the normal discharge chute 6. If there is a production abnormality in the next process of the ring cooling buffer bin 3, the oxidized pellets can be discharged through the emergency discharge chute 5 and the emergency discharge control valve 4 for separate stacking and processing.
[0020] 2) The hot-charging transport vehicle 7 delivers the oxidized pellets in the silo into the hydrogen-based vertical furnace buffer silo 8;
[0021] 3) The discharge temperature of the hydrogen-based vertical furnace buffer bin 8 is 200°C to 400°C, and the oxidized pellets are fed into the vertical lifting device 13 via a quantitative feeding belt conveyor 10;
[0022] 4) The vertical lifting device 13 delivers the oxidized pellets into the hydrogen-based vertical furnace. The temperature of the oxidized pellets entering the hydrogen-based vertical furnace is 100°C to 400°C. The hot oxidized pellets enter the hydrogen-based vertical furnace and react with the reducing gas rising from the lower part of the hydrogen-based vertical furnace, which can further reduce the consumption of external heating furnace gas.
Claims
1. A transfer system for hot delivery of oxidation pellets for direct reduction to a hydrogen-based shaft furnace, characterized by: It comprises a ring cooler, a hot-charging transport vehicle (7), a hydrogen-based vertical furnace buffer bin (8), a quantitative feeding belt conveyor (10) and a vertical lifting device (13); the ring cooler is connected to the hydrogen-based vertical furnace buffer bin (8) through the hot-charging transport vehicle (7), the hydrogen-based vertical furnace buffer bin (8) is connected to the vertical lifting device (13) through the quantitative feeding belt conveyor (10), and the vertical lifting device (13) is connected to the pellet inlet of the hydrogen-based vertical furnace; the ring cooler is a two-stage medium-high temperature ring cooler, comprising a ring cooling buffer bin (3) and a normal unloading chute (6), and the ring cooling buffer bin (3) and the normal unloading chute (6) are both provided with insulation; the hot-charging transport vehicle (7) is provided with a silo, and the silo is provided with insulation; the hydrogen-based vertical furnace buffer bin (8) is provided with insulation; the quantitative feeding belt conveyor (10) is provided with a sealed insulation cover.
2. The transfer system for hot delivery of oxidized pellets for direct reduction to a hydrogen-based shaft furnace according to claim 1, characterized in that: The inner layer of the ring-cooled buffer bin (3) is made of wear-resistant surfacing material, and the outer layer of the bin is made of thermal insulation material; the normal unloading chute (6) is provided with a thermal insulation cover.
3. The system for transferring hot oxide pellets for direct reduction to a hydrogen-based shaft furnace according to claim 1, characterized in that: The silo includes a silo body and a sealed silo cover, the silo body is provided with an inner lining; the inner layer of the inner lining is an impact-resistant wear-resistant surfacing material, and the outer layer of the inner lining is a thermal insulation material; the inner part of the sealed silo cover is provided with thermal insulation material.
4. The system for transferring oxidized pellets for direct reduction to a hydrogen-based shaft furnace according to claim 1, 2 or 3, characterized in that: The hydrogen-based vertical furnace buffer bin (8) is provided with an inner lining; the inner layer of the inner lining is an impact-resistant wear-resistant surfacing material, and the outer layer is a thermal insulation material.