Multi-section semicoke cooling and discharging system

Abstract

The utility model relates to a multi-section semi-coke cooling and discharging system which comprises a first-section semi-coke cooling and discharging device, a second-section semi-coke cooling and discharging device and a third-section semi-coke cooling and discharging device, the first-section semicoke cooling and discharging device consists of a first-section water-cooled wall heat exchanger, a first-section coke pusher and a first-section coke supporting plate; the second-section semicoke cooling and discharging device consists of a second-section water-cooled wall heat exchanger, a second-section coke pusher and a second-section coke supporting plate; the third-section semicoke cooling and discharging device consists of a large quenching tank and a scraper conveyer; hot semi-coke is cooled through the first-section water-cooled wall heat exchanger and then pushed into the second-section water-cooled wall heat exchanger through the first-section coke pusher to recycle heat again, and a first-section semi-coke discharging channel in the first-section water-cooled wall heat exchanger and a second-section semi-coke discharging channel in the second-section water-cooled wall heat exchanger are arranged in a staggered mode, so that the temperature difference between side-wall semi-coke and center semi-coke can be reduced; the cooling uniformity of the semicoke is ensured; and the semicoke subjected to secondary cooling is subjected to temperature and humidity regulation through the large quenching tank, so that the requirements of temperature and water content are met.

Description

Technical Field

[0001] The utility model relates to the technical field of low-rank coal dry distillation, in particular to a multi-stage semi-coke cooling and coke removal system. Background Art

[0002] At present, the main method of upgrading low-rank coal is to use internal heating vertical furnaces. This involves introducing a mixture of coal gas and air into the furnace, where the coal is dry-distilled through combustion. The semi-coke formed after dry distillation is cooled and then discharged. Semi-coke cooling methods mainly include water quenching (wet quenching) and dry quenching. The traditional water quenching process involves directly discharging the high-temperature semi-coke into a quenching box filled with water for cooling. However, when the semi-coke comes into contact with water, a large amount of dust-laden steam is generated, which seriously pollutes the environment. In addition, the heat of the semi-coke is not effectively recovered.

[0003] To address environmental concerns, all newly built internally heated vertical furnaces utilize a dry coke quenching process. This involves cooling the semi-coke obtained after dry distillation in the pyrolysis furnace to below 300°C via water-cooled wall heat exchange. The steam generated by this heat exchange is then transported for external use. After this heat exchange, the semi-coke is controlled by a coke pusher and dropped into a large coke quenching tank. A water spray cooling system is installed within the tank to further cool the semi-coke to the required temperature. However, due to factors such as the water-cooled wall heat exchange efficiency and the poor thermal conductivity of coal, the semi-coke heat cannot be fully recovered. Furthermore, the high moisture content of the coke affects its sales price, resulting in room for further optimization.

[0004] Chinese patent application publication number CN105018120A discloses a "Low-Moisture Coke Quenching Device and Method of Use for Semi-Coal." The quenching device includes a coke collecting bin, the bottom of which is connected to a coke discharging bin, which is equipped with a scraper. A waste heat recovery device for absorbing sensible heat is installed on the top of the coke collecting bin. A first valve is provided between the coke collecting bin and the coke discharging bin, and a second valve is connected between the bottom of the coke discharging bin and the scraper. A coke pusher is connected to one side of the coke collecting bin. During the coke discharging process, the hot semi-coke, approximately 700°C, is initially cooled by heat exchange through a water-cooled wall. The cooled semi-coke is then pushed into the coke collecting bin by the coke pusher. The semi-coke, quenched in the coke collecting bin, is discharged through two electro-hydraulic gate valves, one between the coke collecting bin and the coke discharging bin, and the other between the coke discharging bin and the scraper, which are "opened and closed" to achieve sealed discharge. This device effectively saves energy and improves product quality. However, it does not address the problems of low water-cooled wall heat exchange efficiency and poor coke heat recovery. Summary of the Invention

[0005] The utility model provides a multi-stage semi-coke cooling and coke discharge system. After the hot semi-coke is cooled by a first-stage water-cooled wall heat exchanger, it is pushed into a second-stage water-cooled wall heat exchanger by a first-stage coke pusher to recover heat again. By staggering the first-stage semi-coke discharge channel in the first-stage water-cooled wall heat exchanger and the second-stage semi-coke discharge channel in the second-stage water-cooled wall heat exchanger, the temperature difference between the side wall semi-coke and the center semi-coke can be reduced, thereby ensuring the uniformity of semi-coke cooling. The semi-coke that has undergone secondary cooling is then temperature- and moisture-controlled in a large coke quenching tank to meet temperature and moisture content requirements. The system has a simple structure, is easy to operate, and has high semi-coke heat recovery efficiency.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A multi-stage semi-coke cooling and coke discharge system comprises a first-stage semi-coke cooling and coke discharge device, a second-stage semi-coke cooling and coke discharge device and a third-stage semi-coke cooling and coke discharge device arranged at the bottom of a vertical furnace; a plurality of coke discharge ports are arranged at the bottom of the vertical furnace, and the plurality of coke discharge ports are arranged along the same straight line; the first-stage semi-coke cooling and coke discharge device is composed of a first-stage water-cooled wall heat exchanger, a first-stage coke pusher and a first-stage coke supporting plate; the second-stage semi-coke cooling and coke discharge device is composed of a second-stage water-cooled wall heat exchanger, a second-stage coke pusher and a second-stage coke supporting plate; the three-stage semi-coke cooling and coke discharge device is composed of a coke quenching trough and a scraper conveyor; the first-stage water-cooled wall heat exchanger is arranged in one-to-one correspondence with the coke discharge port of the vertical furnace, and the second-stage water-cooled wall heat exchanger is arranged in one-to-one correspondence with the first-stage water-cooled wall heat exchanger; the inlet of a semi-coke channel in a first-stage water-cooled wall heat exchanger is connected to the corresponding coke discharge port, and the inlet of a first-stage ... second-stage semi-coke channel in a first-stage water-cooled wall heat exchanger is connected to the corresponding coke discharge port. A coke supporting plate is correspondingly arranged below the outlet of the semi-coke channel, and a coke pushing rod of a coke pusher is arranged between a water-cooled wall heat exchanger and a coke supporting plate along the arrangement direction of the coke discharge port; the inlets of the two semi-coke channels in the two-section water-cooled wall heat exchanger and the corresponding outlets of the semi-coke channels are staggered, and are arranged downstream of the outlet of the semi-coke channels along the coke pushing direction of the coke pusher; the two semi-coke unloading channels in the two-section water-cooled wall heat exchanger and the one semi-coke unloading channel in the one-section water-cooled heat exchanger are staggered; two coke supporting plates are correspondingly arranged below the outlet of the two semi-coke channels, and a coke pushing rod of the two-section coke pusher is arranged between the two-section water-cooled wall heat exchanger and the two coke supporting plates along the arrangement direction of the coke discharge port; the coke quenching tank is arranged below the two-section semi-coke cooling and coke discharge device, a cooling water spraying device is provided in the coke quenching tank, and a scraper conveyor is provided at the bottom of the coke quenching tank.

[0008] Furthermore, the section of water-cooled wall heat exchanger is fixed on the bottom beam of the vertical furnace.

[0009] Furthermore, a sealed box body is provided between the first-stage semi-coke cooling and coke discharge device and the second-stage semi-coke cooling and coke discharge device, and a high-temperature expansion joint is provided at the bottom of a first-stage water-cooled wall heat exchanger and connected to the top opening of the sealed box body; a first-stage coke pusher is composed of a first-stage coke pushing rod and a first-stage coke pushing rod driving device, and the first-stage coke pushing rod and a first-stage coke supporting plate are both provided in the sealed box body, and one end of the first-stage coke pushing rod passes through the sealed box body and is connected to the first-stage coke pushing rod driving device; the bottom opening of the sealed box body is connected to the entrance of the second-stage semi-coke channel.

[0010] Furthermore, a sealed box body 2 is provided between the second-stage semi-coke cooling and coke discharge device and the third-stage semi-coke cooling and coke discharge device, and a medium-temperature expansion joint is provided at the bottom of the second-stage water-cooled wall heat exchanger and connected to the top opening of the sealed box body 2; the second-stage coke pusher is composed of a second-stage coke pushing rod and a second-stage coke pushing rod driving device, and the second-stage coke pushing rod and the second-stage coke supporting plate are both provided in the sealed box body 2, and one end of the second-stage coke pushing rod passes through the sealed box body 2 and is connected to the second-stage coke pushing rod driving device; the bottom opening of the sealed box body 2 is connected to the top of the coke quenching tank.

[0011] Furthermore, the water-cooled wall heat exchanger includes a water-cooled wall inlet pipe, a water-cooled wall outer wall, a water-cooled wall inner wall, a water-cooled wall outlet pipe and a steam drum main pipe; the water-cooled wall outer wall is composed of multiple vertically arranged water-cooled wall outer wall water-cooled pipes, the internal space of the water-cooled wall outer wall is a semi-coke channel, the semi-coke channel is divided into multiple semi-coke feeding channels by a water-cooled wall inner wall, and the water-cooled wall inner wall is composed of multiple vertically arranged inner wall water-cooled pipes; the bottom cooling water inlets of the outer wall water-cooled pipe and the inner wall water-cooled pipe are respectively connected to the water-cooled wall inlet pipe; the top cooling water outlets of the outer wall water-cooled pipe and the inner wall water-cooled pipe are respectively connected to the water-cooled wall outlet pipe, and the water-cooled wall outlet pipe is connected to the steam drum through the steam drum main pipe.

[0012] Furthermore, the cross-sectional length of a section of the water-cooled wall heat exchanger is 3600-4200 mm, and the width is 620-720 mm; the height of a section of the water-cooled wall heat exchanger is 2000-2500 mm; and the spacing between the inner walls of a section of the water-cooled wall is 500-700 mm.

[0013] Furthermore, the two-section water-cooled wall heat exchanger includes a two-section water-cooled wall inlet pipe, a two-section water-cooled wall outer wall, a two-section water-cooled wall inner wall, a two-section water-cooled wall outlet pipe and a new water inlet main pipe; the two-section water-cooled wall outer wall is composed of a plurality of vertically arranged two-section outer wall water-cooled pipes, the internal space of the two-section water-cooled wall outer wall is a two-section semi-coke channel, the two-section semi-coke channel is divided into a plurality of two-section semi-coke feeding channels by the two-section water-cooled wall inner wall, and the two-section water-cooled wall inner wall is composed of a plurality of vertically arranged two-section inner wall water-cooled pipes; the bottom cooling water inlets of the two-section outer wall water-cooling pipes and the two-section inner wall water-cooling pipes are respectively connected to the two-section water-cooled wall inlet pipe, and the two-section water-cooled wall inlet pipe is connected to the new water inlet main pipe; the top cooling water outlets of the two-section outer wall water-cooling pipes and the two-section inner wall water-cooling pipes are respectively connected to the two-section water-cooled wall outlet pipe; the two-section water-cooled wall outlet pipe is connected to a water-cooled wall inlet pipe of a one-section water-cooled wall heat exchanger.

[0014] Furthermore, the cross-sectional length of the two-stage water-cooled wall heat exchanger is 4200-4800 mm, and the width is 620-720 mm; the height of the two-stage water-cooled wall heat exchanger is 2500-3000 mm; and the spacing between the inner walls of the two-stage water-cooled wall is 500-700 mm.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1) After being cooled in the first-stage water-wall heat exchanger, the hot coke is pushed into the second-stage water-wall heat exchanger by the first-stage coke pusher to recover heat again. By staggering the first-stage coke discharge channel in the first-stage water-wall heat exchanger and the second-stage coke discharge channel in the second-stage water-wall heat exchanger, the temperature difference between the side wall coke and the center coke can be reduced, ensuring uniformity in coke cooling.

[0017] 2) The semi-coke after secondary cooling is then passed through a large coke quenching tank for temperature and humidity adjustment to ultimately meet the temperature and moisture content requirements;

[0018] 3) The system has a simple structure, is easy to operate, and has high semi-coke heat recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a multi-stage semi-coke cooling and coke removal system described in the utility model.

[0020] Figure 2 yes Figure 1 side view.

[0021] Figure 3 It is a schematic cross-sectional view of a section of the water-cooled wall heat exchanger described in the present invention.

[0022] Figure 4 It is a cross-sectional schematic diagram of the two-stage water-cooled wall heat exchanger of the present invention.

[0023] Figure: 1. First-stage water-cooled wall heat exchanger 101. First-stage water-cooled wall inlet pipe 102. First-stage water-cooled wall outer wall 103. First-stage water-cooled wall inner wall 104. First-stage water-cooled wall outlet pipe 105. Drum main pipe 2. High-temperature expansion joint 3. First-stage coke pusher 4. First-stage coke support plate 5. Second-stage water-cooled wall heat exchanger 501. Fresh water inlet main pipe 502. Second-stage water-cooled wall inlet pipe 503. Second-stage water-cooled wall outer wall 504. Second-stage water-cooled wall inner wall 505. Second-stage water-cooled wall outlet pipe 6. Medium-temperature expansion joint 7. Second-stage coke pusher 8. Second-stage coke support plate 9. Coke quenching tank 10. Scraper conveyor DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0025] like Figure 1 、 Figure 2 As shown, the multi-stage semi-coke cooling and coke removal system described in the present invention includes a first-stage water-cooled wall heat exchanger 1, a high-temperature expansion joint 2, a first-stage coke pusher 3, a first-stage coke supporting plate 4, a second-stage water-cooled wall heat exchanger 5, a medium-temperature expansion joint 6, a second-stage coke pusher 7, a second-stage coke supporting plate 8, a coke quenching tank 9 and a scraper conveyor 10 and other components.

[0026] The bottom of the vertical furnace is equipped with multiple coke discharge ports, which are arranged one-to-one with multiple single-stage water-cooled wall heat exchangers 1. The single-stage water-cooled wall heat exchanger 1 is fixed to the bottom beam of the vertical furnace. The semi-coke after dry distillation is discharged through the coke discharge ports at the bottom of the vertical furnace into the semi-coke channel of the single-stage water-cooled wall heat exchanger 1. The bottom of the single-stage water-cooled wall heat exchanger 1 is equipped with a high-temperature expansion joint 2. Below the high-temperature expansion joint 2, a coke pusher 3 and a coke support plate 4 are installed. After primary cooling, the semi-coke falls onto the coke support plate 4. After the coke discharge speed and heat exchange degree are controlled by the single-stage coke pusher 3, the semi-coke is pushed into the second-stage water-cooled wall heat exchanger 5 for further heat exchange and cooling. A medium-temperature expansion joint 6 is installed at the bottom of the second-stage water-wall heat exchanger 5. After secondary cooling, the semi-coke falls onto the second-stage coke supporting plate 8. After the coke discharge speed and heat exchange degree are controlled by the second-stage coke pusher 7, the semi-coke finally falls into the coke quenching tank 9. A cooling water spray device is installed inside the coke quenching tank 9, and a scraper conveyor 10 is installed at the bottom to transport the semi-coke after temperature and humidity adjustment to the coke processing system.

[0027] The one-stage water-cooled wall heat exchanger 1 of the present invention comprises a water-cooled wall inlet pipe 101, a water-cooled wall outer wall 102, a water-cooled wall inner wall 103, a water-cooled wall outlet pipe 104, and a steam drum header 105. Preferably, the water-cooled wall outer wall 102 is composed of a plurality of vertically arranged seamless steel pipes, and the water-cooled wall inner wall 103 is also composed of a plurality of vertically arranged seamless steel pipes. Desalted and deoxygenated water is passed into the seamless steel pipes to recover heat from the hot semi-coke through heat exchange.

[0028] The cross-sectional dimensions of the one-stage water-cooled wall heat exchanger 1 of the present invention are consistent with the external dimensions of the corresponding coke discharge port. Preferably, the length is 3600-4200 mm, the width is 620-720 mm, and the height of the one-stage water-cooled wall heat exchanger 1 is 2000-2500 mm. A one-stage water-cooled wall inner wall 103 is provided within the one-stage water-cooled wall heat exchanger 1 at intervals of 500-700 mm.

[0029] The two-stage water-cooled wall heat exchanger 5 of the present invention includes a fresh water inlet manifold 501, a second-stage water-cooled wall inlet pipe 502, a second-stage water-cooled wall outer wall 503, a second-stage water-cooled wall inner wall 504, and a second-stage water-cooled wall outlet pipe 505. Preferably, the second-stage water-cooled wall outer wall 503 is composed of a plurality of vertically arranged seamless steel pipes, and the second-stage water-cooled wall inner wall 504 is also composed of a plurality of vertically arranged seamless steel pipes. Deoxygenated and desalted water is passed into the seamless steel pipes to recover heat from the hot semi-coke through heat exchange.

[0030] The cross-sectional area of ​​the two-stage water-cooled wall heat exchanger 5 of the present invention is larger than that of the one-stage water-cooled wall heat exchanger 1. Preferably, its length is 4200-4800 mm and its width is 620-720 mm. The height of the two-stage water-cooled wall heat exchanger 5 is 2500-3000 mm. A second-stage water-cooled wall inner wall 504 is provided within the two-stage water-cooled wall heat exchanger 5 at intervals of 500-700 mm.

[0031] During operation of the multi-stage semi-coke cooling and decoking system described in the present invention, desalinated and deoxygenated water is distributed through the fresh water inlet manifold 501 to the second-stage water-cooled wall inlet pipe 502 of each second-stage water-cooled wall heat exchanger 5, flowing into the water-cooled pipes of the second-stage water-cooled wall outer wall 503 and the second-stage water-cooled wall inner wall 504, exchanging heat in countercurrent with the hot coke. After heat exchange and heating, the desalinated and deoxygenated water is distributed through the second-stage water-cooled wall outlet pipe 505 to the first-stage water-cooled wall inlet pipe 101 of each first-stage water-cooled wall heat exchanger 1, flowing into the water-cooled pipes of the first-stage water-cooled wall outer wall 102 and the first-stage water-cooled wall inner wall 103, continuing to exchange heat in countercurrent with the hot coke. After heat exchange and heating, the desalinated and deoxygenated water is collected and flowed through the first-stage water-cooled wall outlet pipe 104 to the steam drum manifold 105, ultimately flowing to the steam drum for steam generation.

[0032] Preferably, the temperature of the hot semi-coke at the coke discharge port at the bottom of the vertical furnace is 620-670°C. Since the thermal conductivity of the semi-coke is poor, the temperature of the semi-coke after cooling through a water-cooled wall heat exchanger 1 is controlled at: 100-150°C at the side wall and 600-650°C at the center.

[0033] In the present invention, the semi-coke is partially mixed after being pushed by the first coke pusher 3 and enters the second water-cooled wall heat exchanger 5 for further cooling and heat exchange. The second semi-coke discharge channel in the second water-cooled wall heat exchanger 5 is staggered with the first semi-coke discharge channel in the first water-cooled heat exchanger 1 (e.g. Figure 3、 Figure 4 As shown in FIG5 , this staggered arrangement makes the semi-coke near the side wall of the first-stage semi-coke feeding channel and the semi-coke located at the center of the first-stage semi-coke feeding channel swap positions after pushing the coke, that is, the semi-coke near the side wall of the first-stage semi-coke feeding channel is located at the center after entering the second-stage semi-coke feeding channel, while the semi-coke at the center of the first-stage semi-coke feeding channel is located near the side wall after entering the second-stage semi-coke feeding channel, thereby enabling the high-temperature semi-coke that has not undergone deep heat exchange in the first-stage water-cooled wall heat exchanger 1 to achieve deep heat exchange after passing through the second-stage water-cooled wall heat exchanger 5.

[0034] In the present invention, the temperature of the semi-coke after being cooled by the two-stage water-cooled wall heat exchanger 5 is controlled as follows: the temperature at the side wall is 100-150°C, and the temperature at the center is 100-150°C, that is, the average temperature at the semi-coke outlet is controlled at 100-150°C, and the temperature is uniform.

[0035] The large coke quenching tank 9 of the present invention is provided with a cooling water spraying device to further cool down the semi-coke after secondary cooling and adjust the final temperature and humidity of the semi-coke before it is transported out through the scraper conveyor 10.

[0036] In order to more intuitively embody the present invention, the embodiments of the present invention are further described in conjunction with the examples. The following examples are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution that can be obviously obtained by a person skilled in the art within the technical scope disclosed in the present invention, including simple changes or equivalent replacements, is within the scope of protection of the present invention.

[0037] [Example]

[0038] In this embodiment, the multi-stage semi-coke cooling and coke removal system consists of a first-stage water-cooled wall heat exchanger 1, a high-temperature expansion joint 2, a first-stage coke pusher 3, a first-stage coke support plate 4, a second-stage water-cooled wall heat exchanger 5, a medium-temperature expansion joint 6, a second-stage coke pusher 7, a second-stage coke support plate 8, a large coke quenching tank 9 and a scraper conveyor 10.

[0039] The desalinated and deoxygenated water is distributed through the fresh water inlet manifold to the second-stage water-cooled wall inlet pipe 502 of each second-stage water-cooled wall heat exchanger 5, and then flows into the water-cooled tubes of the second-stage water-cooled wall outer wall 503 and the second-stage water-cooled wall inner wall 504, where it undergoes countercurrent heat exchange with the hot coke. After heat exchange, the desalinated and deoxygenated water is distributed through the second-stage water-cooled wall outlet pipe 505 to the first-stage water-cooled wall inlet pipe 101 of each first-stage water-cooled wall heat exchanger 1, and then flows into the water-cooled tubes of the first-stage water-cooled wall outer wall 102 and the first-stage water-cooled wall inner wall 103, where it continues to undergo countercurrent heat exchange with the hot coke. After heat exchange, the desalinated and deoxygenated water is collected and flowed through the first-stage water-cooled wall outlet pipe 104 to the steam drum manifold 105, ultimately flowing to the steam drum for steam generation.

[0040] In this embodiment, the cross-section of the first-stage water-wall heat exchanger 1 is consistent with the outer dimensions of the coke discharge port at the bottom of the vertical furnace, with a length of 3600 mm and a width of 650 mm. The height of the first-stage water-wall heat exchanger 1 is 2000 mm. A first-stage water-wall inner wall 103 is provided within the first-stage water-wall heat exchanger 1 at intervals of 550 mm.

[0041] In this embodiment, the cross-sectional area of ​​the second-stage water-wall heat exchanger 5 is larger than that of the first-stage water-wall heat exchanger 1, specifically, its length is 4200 mm and its width is 650 mm. The height of the second-stage water-wall heat exchanger 5 is 2500 mm. Second-stage water-wall inner walls 504 are provided within the second-stage water-wall heat exchanger 5 at intervals of 550 mm.

[0042] In this embodiment, the second-stage semi-coke feeding channel in the second-stage water-cooled wall heat exchanger 5 and the first-stage semi-coke feeding channel in the first-stage water-cooled heat exchanger 1 are staggered. Figure 3 、 Figure 4 As shown, the first water-cooled wall inner wall 103 of the first water-cooled wall heat exchanger 1 and the second water-cooled wall inner wall of the second water-cooled wall heat exchanger 5 are both symmetrically arranged with the center line of the coke discharge port as the symmetry axis. The middle water-cooled wall inner wall 103 is located on the center line of the coke discharge port, while the two middle second water-cooled wall inner walls 504 are located on both sides of the center line of the coke discharge port, that is, the two are staggered. This staggered arrangement allows the semi-coke near the side wall of the semi-coke discharge channel to interchange with the semi-coke located at the center. That is, the semi-coke near the side wall of the first semi-coke discharge channel is located at the center after entering the second semi-coke discharge channel, while the semi-coke at the center of the first semi-coke discharge channel is located near the side wall after entering the second semi-coke discharge channel. As a result, the high-temperature semi-coke that has not undergone deep heat exchange in the first water-cooled wall heat exchanger 1 can undergo deep heat exchange after passing through the second water-cooled wall heat exchanger 5.

[0043] In this embodiment, the hot semi-coke temperature at the coke discharge outlet at the bottom of the vertical furnace is 650°C. After cooling through the first-stage water-wall heat exchanger 1, the hot semi-coke temperature is controlled to 150°C at the side walls and 600°C at the center. After cooling through the second-stage water-wall heat exchanger 5, the semi-coke temperature is controlled to 150°C at the side walls and 150°C at the center. The average semi-coke outlet temperature is 150°C, and the temperature is uniform.

[0044] After secondary cooling, the semi-coke is further cooled in the coke quenching tank 9 to adjust the final temperature and humidity of the semi-coke. The semi-coke is then conveyed to the coke processing system by the scraper conveyor 10.

[0045] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and inventive concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-stage semi-coke cooling and de-coking system, characterized in that: It comprises a first-stage semi-coke cooling and coke discharge device, a second-stage semi-coke cooling and coke discharge device and a third-stage semi-coke cooling and coke discharge device arranged at the bottom of the vertical furnace; a plurality of coke discharge ports are arranged at the bottom of the vertical furnace, and the plurality of coke discharge ports are arranged along the same straight line; the first-stage semi-coke cooling and coke discharge device is composed of a first-stage water-cooled wall heat exchanger, a first-stage coke pusher and a first-stage coke supporting plate; the second-stage semi-coke cooling and coke discharge device is composed of a second-stage water-cooled wall heat exchanger, a second-stage coke pusher and a second-stage coke supporting plate; the three-stage semi-coke cooling and coke discharge device is composed of a coke quenching trough and a scraper conveyor; the first-stage water-cooled wall heat exchanger is arranged in one-to-one correspondence with the coke discharge port of the vertical furnace, and the second-stage water-cooled wall heat exchanger is arranged in one-to-one correspondence with the first-stage water-cooled wall heat exchanger; the inlet of a first-stage semi-coke channel in a first-stage water-cooled wall heat exchanger is connected to the corresponding coke discharge port, and the outlet of a first-stage semi-coke channel is connected to the second-stage water-cooled wall heat exchanger. A coke supporting plate is correspondingly arranged below, and the coke pushing rod of a coke pusher is arranged between a water-cooled wall heat exchanger and a coke supporting plate along the arrangement direction of the coke discharge port; the inlet of the second section semi-coke channel in the two-section water-cooled wall heat exchanger and the outlet of the corresponding first section semi-coke channel are staggered, and are arranged downstream of the outlet of the first section semi-coke channel along the coke pushing direction of the first section coke pusher; the second section semi-coke unloading channel in the two-section water-cooled wall heat exchanger and the first section semi-coke unloading channel in the first section water-cooled heat exchanger are staggered; two coke supporting plates are correspondingly arranged below the outlet of the second section semi-coke channel, and the coke pushing rod of the second section coke pusher is arranged between the second section water-cooled wall heat exchanger and the second coke supporting plate along the arrangement direction of the coke discharge port; the coke quenching tank is arranged below the second section semi-coke cooling and coke discharge device, a cooling water spraying device is provided in the coke quenching tank, and a scraper conveyor is provided at the bottom of the coke quenching tank.

2. The multi-stage semi-coke cooling and decoking system according to claim 1, characterized in that: The water-cooled wall heat exchanger is fixed on the bottom beam of the vertical furnace.

3. The multi-stage semi-coke cooling and de-coking system according to claim 1, characterized in that: A sealed box body is provided between the first-stage semi-coke cooling and coke discharge device and the second-stage semi-coke cooling and coke discharge device; a high-temperature expansion joint is provided at the bottom of a first-stage water-cooled wall heat exchanger and is connected to the top opening of the sealed box body; a first-stage coke pusher is composed of a first-stage coke pushing rod and a first-stage coke pushing rod driving device; the first-stage coke pushing rod and a first-stage coke supporting plate are both provided in the sealed box body; one end of the first-stage coke pushing rod passes through the sealed box body and is connected to the first-stage coke pushing rod driving device; the bottom opening of the sealed box body is communicated with the entrance of the second-stage semi-coke channel.

4. The multi-stage semi-coke cooling and decoking system according to claim 1, characterized in that: A sealed box body 2 is provided between the second-stage semi-coke cooling and coke discharge device and the third-stage semi-coke cooling and coke discharge device; a medium-temperature expansion joint is provided at the bottom of the second-stage water-cooled wall heat exchanger and is connected to the top opening of the sealed box body 2; the second-stage coke pusher is composed of a second-stage coke pushing rod and a second-stage coke pushing rod driving device; the second-stage coke pushing rod and the second-stage coke supporting plate are both provided in the sealed box body 2; one end of the second-stage coke pushing rod passes through the sealed box body 2 and is connected to the second-stage coke pushing rod driving device; the bottom opening of the sealed box body 2 is communicated with the top of the large coke quenching tank.

5. The multi-stage semi-coke cooling and decoking system according to claim 1, characterized in that: The water-cooled wall heat exchanger includes a water-cooled wall inlet pipe, a water-cooled wall outer wall, a water-cooled wall inner wall, a water-cooled wall outlet pipe and a steam drum main pipe; the water-cooled wall outer wall is composed of multiple vertically arranged water-cooled wall outer wall water-cooled pipes, the internal space of the water-cooled wall outer wall is a semi-coke channel, the semi-coke channel is divided into multiple semi-coke feeding channels by the water-cooled wall inner wall, and the water-cooled wall inner wall is composed of multiple vertically arranged inner wall water-cooled pipes; the bottom cooling water inlets of the outer wall water-cooled pipe and the inner wall water-cooled pipe are respectively connected to the water-cooled wall inlet pipe; the top cooling water outlets of the outer wall water-cooled pipe and the inner wall water-cooled pipe are respectively connected to the water-cooled wall outlet pipe, and the water-cooled wall outlet pipe is connected to the steam drum through the steam drum main pipe.

6. The multi-stage semi-coke cooling and decoking system according to claim 5, characterized in that: The cross-sectional length of the water-cooled wall heat exchanger is 3600-4200 mm, and the width is 620-720 mm; the height of the water-cooled wall heat exchanger is 2000-2500 mm; and the spacing between the inner walls of the water-cooled wall is 500-700 mm.

7. The multi-stage semi-coke cooling and decoking system according to claim 1, characterized in that: The two-section water-cooled wall heat exchanger includes a two-section water-cooled wall inlet pipe, a two-section water-cooled wall outer wall, a two-section water-cooled wall inner wall, a two-section water-cooled wall outlet pipe and a new water inlet main pipe; the two-section water-cooled wall outer wall is composed of a plurality of vertically arranged two-section outer wall water-cooled pipes, the internal space of the two-section water-cooled wall outer wall is a two-section semi-coke channel, the two-section semi-coke channel is divided into a plurality of two-section semi-coke feeding channels by the two-section water-cooled wall inner wall, and the two-section water-cooled wall inner wall is composed of a plurality of vertically arranged two-section inner wall water-cooled pipes; the bottom cooling water inlets of the two-section outer wall water-cooling pipes and the two-section inner wall water-cooling pipes are respectively connected to the two-section water-cooled wall inlet pipe, and the two-section water-cooled wall inlet pipe is connected to the new water inlet main pipe; the top cooling water outlets of the two-section outer wall water-cooling pipes and the two-section inner wall water-cooling pipes are respectively connected to the two-section water-cooled wall outlet pipe; the two-section water-cooled wall outlet pipe is connected to a water-cooled wall inlet pipe of a one-section water-cooled wall heat exchanger.

8. The multi-stage semi-coke cooling and decoking system according to claim 7, characterized in that: The cross-sectional length of the two-stage water-cooled wall heat exchanger is 4200-4800 mm, and the width is 620-720 mm; the height of the two-stage water-cooled wall heat exchanger is 2500-3000 mm; and the spacing between the inner walls of the two-stage water-cooled wall is 500-700 mm.

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