Sintered ore waste heat utilization device of circular cooler

Abstract

The utility model relates to the technical field of sintering waste heat comprehensive utilization, in particular to an annular cooler sinter waste heat utilization device which comprises an annular cooler, and a first cooling section, a second cooling section, a third cooling section, a fourth cooling section and a fifth cooling section are sequentially arranged on the annular cooler in the sinter feeding direction. A lump ore storage bin is arranged on the upper portion of the annular cooler, a discharging opening of the lump ore storage bin is communicated with a continuous weighing device, the continuous weighing device is communicated with a feeding opening of a buffering material receiving groove, and a discharging opening of the buffering material receiving groove is communicated with a hopper of a fourth cooling section of the annular cooler. Flue gas exhausted from the fourth cooling section is subjected to heat transfer with the buffer material receiving groove; and the flue gas discharged from the fifth cooling section enters the fourth cooling section for cyclic utilization. According to the utility model, the lump ore in the buffer material receiving groove is preheated by the flue gas discharged from the fourth cooling section of the annular cooler, and the lump ore is heated and dried by the waste heat of the sintered ore in the annular cooler, so that the moisture content of the lump ore is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of comprehensive utilization of sintering waste heat, in particular to a ring cooler sintering ore waste heat utilization device. Background Art

[0002] The sintering process is an important process in the steel production process. It is mainly used to heat powdered materials such as ore powder at high temperatures and sinter them into bulk sintered ore without completely melting them, so as to facilitate subsequent smelting. The sintered ore produced by the sintering process has a high temperature and generally needs to be cooled to replace the sensible heat of the sintered ore before it can enter the blast furnace smelting process. At present, the main cooling processes for sintered ore include on-machine cooling and off-machine cooling. Off-machine cooling refers to completing the sintering process on a sintering machine and then completing the cooling process of the sintered ore on a separate sintered ore cooler. Sintered ore coolers mainly include belt coolers, ring coolers and vertical kiln coolers. Ring coolers are widely used because of their low cost, small footprint and high overall utilization. Different cooling sections of the ring cooler will produce flue gas of different temperature sections during the cooling of the sintered ore. Among them, the recovery rate of the flue gas in the low temperature section is low.

[0003] Lump ore is an indispensable part of the charge structure for blast furnace ironmaking. It is a raw ore with a certain particle size obtained through crushing and screening after mining. Rainy and snowy weather and the water-pumping and dust suppression treatment during the mining, transportation, transit and storage of ore will increase the moisture content of the lump ore, resulting in more dust adhering to the lump ore. On the one hand, lump ore with high moisture content is prone to cause blockage of the vibrating screen during the screening process, resulting in poor screening effect. A large amount of powder adheres to the surface of the lump ore and cannot be screened out, and eventually enters the blast furnace for smelting, which will also affect the smelting quality and the stability of the blast furnace condition. On the other hand, after the lump ore with high moisture content enters the furnace, it takes a certain amount of time to dry the moisture, which not only prolongs the smelting time, but also increases the coke ratio of the blast furnace, resulting in an increase in the smelting cost of the blast furnace. Utility Model Content

[0004] In view of the problem in the prior art that high moisture content of lump ore easily leads to prolonged blast furnace smelting time and increased smelting cost, the utility model provides a device for utilizing waste heat of sintered ore in a ring cooler, which utilizes the flue gas discharged from the fourth cooling section of the ring cooler to preheat the lump ore in a buffer receiving trough, and by connecting the discharge port of the buffer receiving trough with the hopper of the fourth cooling section of the ring cooler, the preheated lump ore is added to the fourth cooling section, and the waste heat of the sintered ore in the ring cooler is utilized to heat and dry the lump ore, thereby reducing the moisture content of the lump ore.

[0005] The technical solution of this utility model is as follows:

[0006] A device for utilizing waste heat of sintered ore with a ring cooler, comprising a ring cooler, wherein a first cooling section, a second cooling section, a third cooling section, a fourth cooling section and a fifth cooling section are sequentially arranged on the ring cooler along the feeding direction of the sintered ore; a lump ore storage bin is arranged on the upper part of the ring cooler, a discharge port of the lump ore storage bin is connected to a continuous weighing device, the continuous weighing device is connected to a feed port of a buffer receiving trough, and a discharge port of the buffer receiving trough is connected to a hopper of the fourth cooling section of the ring cooler;

[0007] The flue gas discharged from the fourth cooling section conducts heat transfer with the buffer receiving trough; the flue gas discharged from the fifth cooling section enters the fourth cooling section for recycling.

[0008] Furthermore, the inlet of the ring cooler is connected to the outlet of the sintering furnace.

[0009] Furthermore, a gate valve is provided between the discharge port of the lump ore storage bin and the continuous weighing device. The continuous weighing device can be connected to a remote control system. The remote control system can adjust the operating speed of the continuous weighing device. The discharge amount can be adjusted by the gate valve.

[0010] Furthermore, the continuous weighing device is a belt scale.

[0011] Furthermore, the buffer receiving trough is fixed above the fourth cooling section. The smoke discharged from the fourth cooling section can preheat the lump ore in the buffer receiving trough.

[0012] Furthermore, the buffer receiving trough is close to the side of the smoke collecting hood of the fourth cooling section.

[0013] Furthermore, the buffer receiving trough is provided with a dust removal device, which is used to remove dust generated by the lump ore during the preheating process.

[0014] Furthermore, the smoke exhausted from the fifth cooling section enters the fourth cooling section through the return air duct of the fourth cooling section.

[0015] Furthermore, the outlet of the ring cooler is connected to the feed port of the screening device, and the screening device is provided with a first discharge port and a second discharge port, the first discharge port is connected to the entrance of the blast furnace, and the second discharge port is connected to the entrance of the sintering furnace. The screening device is preferably a vibrating screening device, and the screening device can transport the sintered ore and lump ore with larger particle size to the blast furnace for smelting through the first discharge port, and the screening device can transport the sintered ore and lump ore with smaller particle size to the sintering furnace for re-mixing and sintering through the second discharge port.

[0016] Furthermore, the smoke exhausted from the first cooling section and the second cooling section is connected to the steam boiler heating pipeline, and the smoke exhausted from the third cooling section is connected to the sintering hot air circulation system.

[0017] The beneficial effects of the utility model are:

[0018] The utility model provides a device for utilizing waste heat from sintered ore in a ring cooler. The device utilizes a continuous weighing device to quantitatively weigh lump ore, and conveys the lump ore to a buffer receiving trough. The waste heat of flue gas discharged from the fourth cooling section of the ring cooler is utilized to preheat the lump ore in the buffer receiving trough, thereby preliminarily reducing the moisture content and powder content of the lump ore. The discharge port of the buffer receiving trough is connected with the hopper of the fourth cooling section of the ring cooler, the preheated lump ore is added to the fourth cooling section, and the waste heat of the sintered ore in the ring cooler is utilized to heat and dry the lump ore, thereby further reducing the moisture content of the lump ore, and at the same time being beneficial to reducing the ore temperature of the sintered ore and improving the cooling efficiency of the sintered ore.

[0019] The utility model also allows the smoke exhausted from the fifth cooling section to be passed into the fourth cooling section for recycling, thereby improving the utilization rate of the smoke exhausted from the fifth cooling section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the ring cooler sintering ore waste heat utilization device in Example 1.

[0022] In the figure, 1-annular cooler, 2-sintering furnace, 3-first cooling section, 4-second cooling section, 5-third cooling section, 6-fourth cooling section, 7-fifth cooling section, 8-belt scale, 9-buffer receiving trough, 10-plate feeder, 11-first belt conveyor, 12-second belt conveyor, 13-vibration screening device, 14-dust removal device, 15-lump ore storage bin. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] Example 1

[0025] A device for utilizing waste heat of sintered ore with a ring cooler comprises a ring cooler 1, on which a first cooling section 3, a second cooling section 4, a third cooling section 5, a fourth cooling section 6 and a fifth cooling section 7 are sequentially arranged along the feeding direction of the sintered ore. The inlet of the ring cooler 1 is connected with the outlet of the sintering furnace 2, and a lump ore storage bin 15 is arranged on the upper part of the ring cooler 1. The lump ore storage bin 15 is used to receive and store lump ore from a raw material field. The lump ore storage bin 15 is located above a belt scale 8, and the discharge port of the lump ore storage bin 15 is connected with the starting end of the belt scale 8 to ensure that the lump ore in the lump ore storage bin 15 is discharged through the discharge port and smoothly transported to the starting end of the belt scale 8. The terminal end of the belt scale 8 is connected with the feeding port of a buffer receiving trough 9. The buffer receiving trough 9 is fixed above the fourth cooling section 6, and the buffer receiving trough 9 is close to the side of the smoke collecting hood of the fourth cooling section 6. The flue gas discharged from the fourth cooling section 6 can preheat the lump ore in the buffer receiving trough 9. The discharge port of the buffer receiving trough 9 is connected to the hopper of the fourth cooling section 6 of the ring cooler. A dust removal device 14 is arranged above the buffer receiving trough 9.

[0026] The flue gas discharged from the first cooling section 3 and the second cooling section 4 is used to provide heat for the steam boiler, the flue gas discharged from the third cooling section 5 enters the sintering hot air circulation system, the flue gas discharged from the fourth cooling section 6 transfers heat with the buffer receiving trough 9; the flue gas discharged from the fifth cooling section 7 enters the fourth cooling section 6 through the return air duct of the fourth cooling section for recycling.

[0027] The outlet of the ring cooler 1 and the feed port of the vibrating screening device 13 are connected in sequence through the plate feeder 10, the first belt conveyor 11, and the second belt conveyor 12. The plate feeder 10 can play a buffering role. The vibrating screening device 13 is provided with a first discharge port and a second discharge port. The first discharge port is connected to the entrance of the blast furnace, and the second discharge port is connected to the entrance of the raw material batching bin of the sintering furnace 2. The vibrating screening device 13 can transport the sintered ore and lump ore with a particle size greater than 5mm to the blast furnace for smelting through the first discharge port, and the vibrating screening device 13 can transport the sintered ore and lump ore with a particle size not exceeding 5mm to the sintering furnace 2 for re-batch sintering through the second discharge port. The first belt conveyor 11 is a Z4 / 5-1 belt, and the second belt conveyor 12 is a SF-1 / 2 belt. The number of belt conveyors can be adjusted to one or more according to the site.

[0028] Instructions for use: First, transport the lump ore from the raw material field to the lump ore storage bin via the conveyor belt for storage. Then open the outlet of the sintering furnace and discharge the hot sintered ore through the outlet of the sintering furnace. The hot sintered ore enters the ring cooler from the entrance of the ring cooler, and then passes through the first cooling section, the second cooling section, the third cooling section, the fourth cooling section and the fifth cooling section to cool down step by step. The flue gas discharged after the sintered ore is cooled in the first cooling section and the second cooling section has a high temperature and can be used to provide heat for the steam boiler; the flue gas discharged after the sintered ore is cooled in the third cooling section is led back to the sintering furnace to participate in the sintering hot air circulation. When the sintered ore enters the fourth cooling section, the temperature of the sintered ore drops to 150-200℃. At this time, the lump storage bin is opened, and a belt scale is used to weigh an appropriate amount of lump ore and the weighed lump ore is transported to the buffer receiving trough. Since the buffer receiving trough is close to the side of the smoke hood of the fourth cooling section, the flue gas discharged from the fourth cooling section can preheat and dehydrate the lump ore in the buffer receiving trough and remove part of the water in the lump ore. During the lump ore preheating process, the dust removal device arranged above the buffer receiving trough can remove part of the dust generated by the lump ore during the preheating process to prevent dust from entering the screening device and causing blockage. The lump ore that has been preheated and dehydrated enters the fourth cooling section from the hopper of the fourth cooling section and is mixed with the hot sintered ore in the fourth cooling section. The temperature of the hot sintered ore is higher than that of the lump ore, and heat transfer can occur with the lump ore. The waste heat of the hot sintered ore is used to heat and dry the lump ore. At the same time, the lump ore can also accelerate the cooling of the hot sintered ore. The hot sintered ore and lump ore enter the fifth cooling section together to continue cooling to 100-120℃. The flue gas discharged from the fifth cooling section enters the fourth cooling section through the return air duct of the fourth cooling section for recycling, which improves the utilization rate of flue gas waste heat. The sintered ore and lump ore cooled by the ring cooler enter the vibrating screening device for screening, and the sintered ore and lump ore with a particle size greater than 5mm are transported to the blast furnace for smelting, and the sintered ore and lump ore with a particle size not exceeding 5mm are transported to the sintering furnace for re-batch sintering, which improves the stability of the blast furnace condition, shortens the blast furnace smelting time, and reduces the smelting cost.

[0029] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A ring cooler sintering waste heat utilization device, comprising a ring cooler, characterized in that: The ring cooler is provided with a first cooling section, a second cooling section, a third cooling section, a fourth cooling section and a fifth cooling section in sequence along the sintered ore feeding direction; a lump ore storage bin is provided on the upper part of the ring cooler, a discharge port of the lump ore storage bin is connected to a continuous weighing device, the continuous weighing device is connected to a feed port of a buffer receiving trough, and a discharge port of the buffer receiving trough is connected to a hopper of the fourth cooling section of the ring cooler; The flue gas discharged from the fourth cooling section conducts heat transfer with the buffer receiving trough; the flue gas discharged from the fifth cooling section enters the fourth cooling section for recycling.

2. The ring cooler sintering waste heat utilization device according to claim 1, characterized in that: The inlet of the ring cooler is connected to the outlet of the sintering furnace.

3. The ring cooler sintering waste heat utilization device according to claim 1, characterized in that: A gate valve is arranged between the discharge port of the lump ore storage bin and the continuous weighing device.

4. A ring cooler sintering waste heat utilization device as claimed in claim 1 or 3, characterized in that: The continuous weighing device is a belt scale.

5. The device for utilizing waste heat from sintered ore using a ring cooler as claimed in claim 1, characterized in that: The buffer receiving trough is fixed above the fourth cooling section.

6. The ring cooler sintering waste heat utilization device according to claim 5, characterized in that: The buffer receiving trough is close to the side of the smoke collecting hood of the fourth cooling section.

7. The ring cooler sintering waste heat utilization device according to claim 1, characterized in that: The buffer receiving trough is equipped with a dust removal device.

8. The device for utilizing waste heat from sintered ore using a ring cooler as claimed in claim 1, characterized in that: The smoke exhausted from the fifth cooling section enters the fourth cooling section through the return air duct of the fourth cooling section.

9. The ring cooler sintering waste heat utilization device according to claim 2, characterized in that: The outlet of the ring cooler is connected to the feed port of the screening device. The screening device is provided with a first discharge port and a second discharge port. The first discharge port is connected to the inlet of the blast furnace, and the second discharge port is connected to the inlet of the sintering furnace.

10. The ring cooler sintering waste heat utilization device according to claim 1, characterized in that: The smoke exhausted from the first cooling section and the second cooling section is connected to the steam boiler heating pipeline, and the smoke exhausted from the third cooling section is connected to the sintering hot air circulation system.

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