Dry quenching system

Abstract

The embodiment of the utility model provides a dry quenching system which comprises a dry quenching furnace, a dust removal system, a high-temperature flue gas pipeline, a low-temperature flue gas pipeline and an ash discharge device, and the dry quenching furnace is provided with a high-temperature flue gas discharge port and a low-temperature flue gas discharge port; a high-temperature flue gas pipeline is respectively connected with the high-temperature flue gas discharge port and the dust removal system; a low-temperature flue gas pipeline is respectively connected with the low-temperature flue gas discharge port and the dust removal system; the ash discharging device is arranged at the bottom of the low-temperature flue gas pipeline, and after the solid sediments are left at the bottom of the low-temperature flue gas pipeline, the solid sediments at the bottom in the low-temperature flue gas pipeline can be discharged through the ash discharging device, so that the liquidity of the low-temperature flue gas pipeline is improved, and the dust removal effect of the dry quenching system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dry quenching coke treatment, in particular to a dry quenching coke system. Background Art

[0002] Coke quenching is the process of cooling red-hot coke to a temperature suitable for transportation and storage. Coke quenching can be divided into two methods: dry quenching (CDQ) and wet quenching. With increasing national requirements for flue gas emission control, dry quenching has gradually replaced wet quenching and become the mainstream quenching technology in the coking market. The dust removal systems that accompany dry quenching have also become a focus of attention.

[0003] The dust removal system for dry coke quenching mainly consists of dust removal ducts, a heat storage cooler, a pulse bag dust collector, a dust removal fan, a muffler, dust cleaning equipment, and ash conveying equipment. The low-temperature flue gas generated by the dry quenching furnace enters the dry coke quenching dust removal system through the low-temperature flue gas duct. The inventors have discovered that if the low-temperature flue gas duct is not insulated, the dust-laden low-temperature flue gas in the low-temperature flue gas duct will contain water vapor. During the transportation of the low-temperature flue gas, the dust-laden low-temperature flue gas will easily liquefy and precipitate liquid water after the temperature drops. The liquid water mixes with the dust particles to produce solid precipitates, which are deposited on the lower surface of the low-temperature flue gas duct. As the operating life increases, the accumulation of solid sediments on the lower surface of the low-temperature flue gas duct will reduce the cross-sectional area of ​​the flue gas flowing through the low-temperature flue gas duct, affecting the dust removal efficiency of the pulse bag dust collector. Utility Model Content

[0004] The purpose of the present invention is to provide a dry quenching system to improve the flowability of low-temperature flue gas ducts and enhance the dust removal effect of the dry quenching system. The specific technical solution is as follows:

[0005] To achieve the above-mentioned objectives, the present invention provides a dry quenching system according to an embodiment of the present invention, comprising: a dry quenching furnace having a high-temperature flue gas outlet and a low-temperature flue gas outlet; a dust removal system; a high-temperature flue gas duct, respectively connecting the high-temperature flue gas outlet and the dust removal system; a low-temperature flue gas duct, respectively connecting the low-temperature flue gas outlet and the dust removal system; and an ash discharge device, arranged at the bottom of the low-temperature flue gas duct, for discharging solid sediment at the bottom of the low-temperature flue gas duct.

[0006] According to one embodiment of the present utility model application, the ash discharge device includes an ash discharge pipe, a first valve and a dust collecting component; the bottom of the low-temperature flue gas duct has an ash discharge port; the inlet of the ash discharge pipe is connected to the ash discharge port of the low-temperature flue gas duct; the outlet of the ash discharge pipe is connected to the inlet of the dust collecting component through the first valve.

[0007] According to one embodiment of the present utility model application, the ash discharge device also includes a detachable first joint and a second joint; the inlet of the first valve and the outlet of the ash discharge pipe are connected; the first joint and the outlet of the first valve are connected, and the second joint and the inlet of the dust collecting component are connected, and the first joint and the second joint are detachably connected.

[0008] According to one embodiment of the present invention, the dust collecting component includes a first ash storage pipe and a second valve; the second joint is connected to the inlet of the first ash storage pipe, and the second valve is arranged at the outlet of the first ash storage pipe.

[0009] According to one embodiment of the present invention, the dust collecting component includes a sealed dust box; the second joint is connected to the inlet of the sealed dust box.

[0010] According to one embodiment of the present utility model application, the dust collecting component includes a second ash storage pipe, a third valve and a compressed air purge pipe; the inlet of the second ash storage pipe is connected to the first valve, the outlet of the second ash storage pipe is connected to the third valve, and the air blowing port of the compressed air purge pipe is connected to the air inlet of the second ash storage pipe.

[0011] According to one embodiment of the present utility model application, the dust collecting component further includes a pulse valve, and the pulse valve is arranged in the compressed air purge pipe.

[0012] According to one embodiment of the present utility model application, the nominal diameter of the ash discharge pipe is DN, DN≥65mm.

[0013] According to an embodiment of the present utility model application, it also includes: a flame arrester, which is arranged between the low-temperature flue gas duct and the dust removal system.

[0014] According to one embodiment of the present utility model application, the ash discharge device is composed of at least two groups, which are arranged at intervals along the exhaust direction of the low-temperature flue gas duct.

[0015] The dry quenching system provided by the embodiment of the present invention includes a dry quenching furnace, a dust removal system, a high-temperature flue gas duct, a low-temperature flue gas duct and an ash discharge device. The dry quenching furnace has a high-temperature flue gas discharge port and a low-temperature flue gas discharge port; the high-temperature flue gas duct is respectively connected to the high-temperature flue gas discharge port and the dust removal system; the low-temperature flue gas duct is respectively connected to the low-temperature flue gas discharge port and the dust removal system; the ash discharge device is arranged at the bottom of the low-temperature flue gas duct. After solid sediment remains at the bottom of the low-temperature flue gas duct, the solid sediment at the bottom of the low-temperature flue gas duct can be discharged through the ash discharge device, so as to improve the flowability of the low-temperature flue gas duct and enhance the dust removal effect of the dry quenching system.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic structural diagram of a coke dry quenching system provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a first structure of a low-temperature flue gas duct and an ash discharge device of a coke dry quenching system provided in an embodiment of the present application;

[0020] Figure 3 A second structural diagram of a low-temperature flue gas duct and an ash discharge device of a dry coke quenching system provided in an embodiment of the present application;

[0021] Figure 4 This is a third structural schematic diagram of a low-temperature flue gas duct and an ash discharge device of a dry coke quenching system provided in an embodiment of the present application.

[0022] The reference numerals are as follows:

[0023] Dry quenching furnace 10, dust removal system 20, high-temperature flue gas duct 30, low-temperature flue gas duct 40, ash discharge device 50, ash discharge pipe 51, first valve 52, dust collecting component 53, first ash storage pipe 531, second valve 532, sealed dust collection box 533, second ash storage pipe 534, third valve 535, compressed air purge pipe 536, pulse valve 537, first connector 54, second connector 55, flame arrester 60. DETAILED DESCRIPTION

[0024] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of the present invention.

[0025] During CDQ system operation, the gas circulation line connecting the CDQ furnace to the system contains a negative pressure section, which often has leaks, introducing a small amount of external air into the gas circulation line. Furthermore, the CDQ system requires a large amount of air to support combustion and control the concentration of combustible gas components in the circulation line below the explosion limit. Consequently, some water vapor is present in the flue gas from the CDQ furnace's coke discharge chute, the flat gate ash outlet, and the coke discharge point.

[0026] In the cold winter, liquid water mixes with dust particles and freezes, creating solid deposits that cling tightly to the lower surface of the low-temperature flue gas duct, making them difficult for maintenance personnel to remove. This solid deposit clogs the flue gas flow through the duct, reducing its cross-sectional area. Furthermore, when large amounts of solid deposits accumulate, the large amounts of water vapor released easily come into contact with the pulse dust collector's bags, reducing the dust removal efficiency and shortening the bags' service life.

[0027] In view of the characteristics of low-temperature flue gas from dry coke quenching, this application installs an ash discharge device on the lower surface of the low-temperature flue gas duct, thereby facilitating the discharge of solid sediments at the bottom of the low-temperature flue gas duct through the ash discharge device, improving the flowability of the low-temperature flue gas duct, and enhancing the dust removal effect of the dry coke quenching system.

[0028] Figure 1 A schematic structural diagram of a dry coke quenching system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, a dry quenching system includes a dry quenching furnace 10, a dust removal system 20, a high-temperature flue gas duct 30, a low-temperature flue gas duct 40 and an ash discharge device 50. The dry quenching furnace 10 has a high-temperature flue gas discharge port and a low-temperature flue gas discharge port; the high-temperature flue gas duct 30 is respectively connected to the high-temperature flue gas discharge port and the dust removal system 20; the low-temperature flue gas duct 40 is respectively connected to the low-temperature flue gas discharge port and the dust removal system 20; the ash discharge device 50 is arranged at the bottom of the low-temperature flue gas duct 40 for discharging solid sediments at the bottom of the low-temperature flue gas duct 40.

[0029] During the operation of the CDQ system, if solid sediment is generated and adheres to the lower surface of the low-temperature flue gas duct 40, maintenance personnel can use the ash discharge device 50 to remove the solid sediment adhered to the lower surface of the low-temperature flue gas duct 40 and discharge it out of the low-temperature flue gas duct 40, thereby increasing the cross-sectional ventilation area of ​​the low-temperature flue gas duct 40, improving the flowability of the low-temperature flue gas duct 40, and enhancing the dust removal effect of the CDQ system.

[0030] In a specific implementation, the CDQ system further includes a flame arrester 60 , which is disposed between the low-temperature flue gas duct 40 and the dust removal system 20 .

[0031] When the dust removal system 20 is running, some dust particles in the dust-laden airflow will produce solid deposits after coming into contact with the water vapor in the airflow, and settle to the bottom of the low-temperature dust removal pipe. As the running time of the dust removal system 20 increases, the accumulated solid deposits also increase. The solid deposits accumulated at the bottom of the low-temperature dust removal pipe are affected by the fan of the dust removal system 20 and will move toward the flame arrester 60 and flow through the ash discharge device 50, so that the ash discharge device 50 can discharge the solid deposits at the bottom of the low-temperature flue gas pipe 40.

[0032] Figure 2 A first structural diagram of a low-temperature flue gas pipeline and an ash discharge device of a dry coke quenching system provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the ash discharge device 50 includes an ash discharge pipe 51, a first valve 52, and a dust collection component 53. The bottom of the low-temperature flue gas duct 40 has an ash discharge port. The inlet of the ash discharge pipe 51 is connected to the ash discharge port of the low-temperature flue gas duct 40. The outlet of the ash discharge pipe 51 is connected to the inlet of the dust collection component 53 through the first valve 52. When the dust removal system 20 is in operation, the first valve 52 can be opened. During the process of solid sediment accumulated at the bottom of the low-temperature dust removal duct flowing through the ash discharge device 50, the solid sediment falls from the ash discharge pipe 51 and falls into the dust collection component 53 through the first valve 52, thereby completing the collection of the solid sediment settled at the bottom of the low-temperature dust removal duct.

[0033] In order to facilitate the cleaning of the collected solid sediment, in a first implementation, the ash discharge device 50 also includes a detachable first joint 54 and a second joint 55; the inlet of the first valve 52 is connected to the outlet of the ash discharge pipe 51; the first joint 54 is connected to the outlet of the first valve 52, and the second joint 55 is connected to the inlet of the dust collecting component 53, and the first joint 54 and the second joint 55 are detachably connected.

[0034] Both the first joint 54 and the second joint 55 are flexible joints, meaning they can be easily disassembled and reassembled. When the dust collecting component 53 needs to be cleaned, the first valve 52 can be closed to prevent solid deposits from falling through the first valve 52. The first joint 54 and the second joint 55 can then be disassembled to separate the dust collecting component 53 from the ash discharge pipe 51, making it easier to clean the solid deposits accumulated within the dust collecting component 53. After cleaning, the first joint 54 and the second joint 55 can be reconnected and the first valve 52 can be opened. This embodiment of the present invention allows condensate to be discharged from the low-temperature flue gas duct 40 without affecting the normal operation of the dry coke quenching system's dust removal system 20, ensuring a sufficient cross-sectional area for flue gas flow through the low-temperature flue gas duct 40 and improving the operating efficiency of the bag filter. When the dry coke quenching system is shut down for maintenance, the solid deposits in the dust collecting component 53 can be easily cleaned by disassembling the first joint 54 and the second joint 55.

[0035] In a specific embodiment, the dust collection component 53 includes a first ash storage pipe 531 and a second valve 532. The second connector 55 is connected to the inlet of the first ash storage pipe 531, and the second valve 532 is located at the outlet of the first ash storage pipe 531. During operation of the CDQ system, the first valve 52 is opened and the second valve 532 is closed. Solid sediment accumulated at the bottom of the low-temperature dust removal pipe enters the first ash storage pipe 531 through the first valve 52. Since the second valve 532 is closed, the solid sediment can remain in the first ash storage pipe 531. When the CDQ system is shut down for maintenance, the first ash storage pipe 531 can be separated from the ash discharge pipe 51 by removing the first connector 54 and the second connector 55. The first ash storage pipe 531 can then be moved to the ash discharge location, and the second valve 532 can be opened to conveniently discharge the ash from the first ash storage pipe 531. After ash discharge is complete, the first connector 54 and the second connector 55 are reconnected, and the second valve 532 is closed. Of course, the first ash storage pipe 531 can also be cleaned without affecting the continuous operation of the dust removal system 20. The first ash storage pipe 531 can store not only solid sediments but also liquid water precipitated by temperature drop.

[0036] The dust removal system 20 primarily includes dust removal ducts, a thermal storage cooler, a pulse bag filter, a dust removal fan, a muffler, dust cleaning equipment, and dust conveying equipment. The diameter of the ash discharge pipe 51 is preferably selected based on the diameter of the dust removal duct in the dust removal system 20 and the dust removal air volume of the dust removal fan. Because the solid sediment produced by the mixture of liquid water and dust particles has a high viscosity, in some embodiments, the nominal diameter (DN) of the ash discharge pipe 51 is preferably greater than or equal to 65 mm, i.e., DN65. For example, the nominal diameter of the ash discharge pipe 51 is DN65, DN80, or DN100.

[0037] The high-temperature flue gas duct 30 and the low-temperature flue gas duct 40 enter the heat storage cooler in two ways for mixed heat exchange. After the temperature reaches the allowable temperature of the pulse bag dust collector, it flows into the pulse bag dust collector for dust removal.

[0038] In order to further enhance the ash discharge effect of the ash discharge device 50 and improve the flowability of the low-temperature flue gas duct 40, the ash discharge device 50 is provided in at least two groups, spaced apart along the exhaust direction of the low-temperature flue gas duct 40. The solid sediment accumulated at the bottom of the low-temperature dust removal duct is acted upon by the fan of the environmental dust removal ground station, moving along the exhaust direction of the low-temperature flue gas duct 40 toward the flame arrester 60 and flowing through each group of ash discharge devices 50. The ash discharge device 50 located at the rear of the exhaust direction can collect the solid sediment missed by the ash discharge device 50 located at the front, thereby enhancing the collection effect of the ash discharge device 50 on the solid sediment and facilitating the discharge of more solid sediment from the low-temperature flue gas duct 40.

[0039] In the embodiment of this solution, in addition to the above-mentioned implementation method, the dust collecting component 53 can also adopt other structural forms. The dust discharging device 50 includes a detachable first joint 54 and a second joint 55. Figure 3 A second structural diagram of a low-temperature flue gas duct and an ash discharge device of a dry coke quenching system provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the dust collection component 53 includes a sealed dust box 533; the second connector 55 is connected to the inlet of the sealed dust box 533. The sealed dust box 533 is used to collect condensate and solid sediment. The operator can regularly disassemble and assemble the first connector 54 and the second connector 55 to separate the sealed dust box 533 for cleaning.

[0040] In the embodiment of this solution, in addition to the above-mentioned implementation method, the dust collecting component 53 can also adopt other structural forms, and the dust discharging device 50 can also be provided with the detachable first joint 54 and the second joint 55. Figure 4 A third structural diagram of a low-temperature flue gas duct and an ash discharge device of a dry coke quenching system provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the dust collecting component 53 includes a second ash storage pipe 534, a third valve 535 and a compressed air purge pipe 536; the inlet of the second ash storage pipe 534 is connected to the first valve 52, the outlet of the second ash storage pipe 534 is connected to the third valve 535, and the air blowing port of the compressed air purge pipe 536 is connected to the air inlet of the second ash storage pipe 534.

[0041] During operation of the CDQ system, the first valve 52 is opened and the third valve 535 is closed, and solid sediment is collected in the second ash storage pipe 534. During ash cleaning operations, maintenance personnel close the first valve 52, open the third valve 535, and open the compressed air purge pipe 536 to blow air into the second ash storage pipe 534. This allows the solid sediment in the second ash storage pipe 534 to be discharged through the third valve 535. Compared with relying on gravity to discharge the solid sediment, this method can facilitate the cleaning of solid sediment adhering to the second ash storage pipe 534.

[0042] Furthermore, in the aforementioned dry quenching system, the dust collecting component 53 further includes a pulse valve 537, which is disposed in the compressed air purge pipe 536. When the compressed air purge pipe 536 is opened, the pulse valve 537 is opened. Under the action of the pulse valve 537, the compressed air purge pipe 536 blows pulse gas into the second ash storage pipe 534, thereby better cleaning solid deposits adhering to the second ash storage pipe 534.

[0043] Among them, the high-temperature flue gas discharge port is not limited to one. In some embodiments, for example, the high-temperature flue gas discharge port includes the flue gas discharge port 1 at the top of the dry quenching furnace 10 where coke is loaded, the discharge port 2 for releasing flue gas by pressure regulation in the pre-storage chamber at the top of the dry quenching furnace, and the discharge port 3 for releasing flue gas after the dry quenching circulating fan. The high-temperature flue gas duct 30 is respectively connected to the above-mentioned discharge port 1, discharge port 2 and discharge port 3, and the high-temperature flue gas generated when the top of the dry quenching furnace 10 is loaded with coke, the high-temperature flue gas released by pressure regulation in the pre-storage chamber at the top of the dry quenching furnace, and the high-temperature flue gas released after the dry quenching circulating fan are mixed and then enter the dust removal system 20 through the high-temperature flue gas duct 30.

[0044] Among them, the low-temperature flue gas discharge port is not limited to one. In some embodiments, for example, the low-temperature flue gas discharge port includes discharge port four at the coke discharge chute at the bottom of the dry quenching furnace 10, discharge port five at the ash discharge port of the flat gate, and discharge port six at the coke discharge point. The low-temperature flue gas duct 40 is connected to the above-mentioned discharge port four, discharge port five and discharge port six respectively, and the low-temperature flue gas at the coke discharge chute at the bottom of the dry quenching furnace 10, the low-temperature flue gas at the ash discharge port of the flat gate, and the low-temperature flue gas at the coke discharge point are mixed and then enter the dust removal system 20 through the low-temperature flue gas duct 40.

[0045] In the embodiment of this solution, the first valve 52, the second valve 532 and the third valve 535 are not limited in form, and can be, for example, ball valves, gate valves, stop valves, butterfly valves or diaphragm valves, etc. They can be manual valves or electric valves.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A dry quenching system, characterized in that: include: A dry quenching furnace (10) having a high-temperature flue gas discharge port and a low-temperature flue gas discharge port; Dust removal system (20); a high-temperature flue gas duct (30) connected to the high-temperature flue gas discharge port and the dust removal system (20); a low-temperature flue gas duct (40), connected to the low-temperature flue gas discharge port and the dust removal system (20), respectively; An ash discharge device (50) is provided at the bottom of the low-temperature flue gas duct (40) and is used to discharge solid sediments at the bottom of the low-temperature flue gas duct (40).

2. The dry quenching system according to claim 1, characterized in that: The ash discharge device (50) comprises an ash discharge pipe (51), a first valve (52) and a dust collecting component (53); The bottom of the low-temperature flue gas duct (40) is provided with an ash discharge port; The inlet of the ash discharge pipe (51) is connected to the ash discharge port of the low-temperature flue gas duct (40); The outlet of the ash discharge pipe (51) is connected to the inlet of the dust collecting component (53) through the first valve (52).

3. The dry quenching system according to claim 2, characterized in that: The ash discharge device (50) further includes a detachable first joint (54) and a second joint (55); The inlet of the first valve (52) is connected to the outlet of the ash discharge pipe (51); The first connector (54) is connected to the outlet of the first valve (52), and the second connector (55) is connected to the inlet of the dust collecting component (53). The first connector (54) and the second connector (55) are detachably connected.

4. The dry quenching system according to claim 3, characterized in that: The dust collecting component (53) includes a first dust storage pipe (531) and a second valve (532); The second joint (55) is connected to the inlet of the first ash storage pipe (531), and the second valve (532) is provided at the outlet of the first ash storage pipe (531).

5. The dry quenching system according to claim 3, characterized in that: The dust collecting component (53) includes a sealed dust collecting box (533); The second joint (55) is connected to the inlet of the sealed dust box (533).

6. The dry quenching system according to claim 2, characterized in that: The dust collecting component (53) includes a second dust storage pipe (534), a third valve (535) and a compressed air purge pipe (536); The inlet of the second ash storage pipe (534) is connected to the first valve (52), the outlet of the second ash storage pipe (534) is connected to the third valve (535), and the air blowing port of the compressed air purge pipe (536) is connected to the air inlet of the second ash storage pipe (534).

7. The dry quenching system according to claim 6, characterized in that: The dust collecting component (53) further includes a pulse valve (537), and the pulse valve (537) is arranged on the compressed air purge pipe (536).

8. The dry quenching system according to any one of claims 2 to 7, characterized in that: The nominal diameter of the ash discharge pipe (51) is DN, DN≥65mm.

9. The dry quenching system according to any one of claims 1 to 7, characterized in that: Also includes: A flame arrester (60) is provided between the low-temperature flue gas duct (40) and the dust removal system (20).

10. The dry quenching system according to any one of claims 1 to 7, characterized in that: The ash discharge devices (50) are in at least two groups and are arranged at intervals along the exhaust direction of the low-temperature flue gas duct (40).

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