Multi-section type semi-coke deep cooling and coke discharging system and multi-section type semi-coke deep cooling and coke discharging method

Abstract

The invention relates to a multi-section semi-coke deep cooling and coke discharging system and method. The system comprises a first-section semi-coke cooling and coke discharging device, a second-section semi-coke cooling device, a coke discharging distributor, a third-section semi-coke cooling and coke discharging device, a coke quenching large tank and a scraper conveyor, the first-section semicoke cooling and discharging device consists of a plurality of first-section steam generators and a first-section semicoke discharging mechanism; the second-section semicoke cooling device consists of a plurality of second-section water-cooled wall heat exchangers; a humidifying nozzle is arranged in the coke discharging distributor; the third-section semicoke cooling and discharging device consists of a plurality of third-section water-cooled wall heat exchangers and a third-section semicoke discharging mechanism; semicoke is discharged into a second-section water-cooled wall heat exchanger under the control of a first-section coke pusher after being subjected to heat exchange through a first-section steam generator, enters a third-section water-cooled wall heat exchanger after being subjected to second-section cooling and is finally discharged into a large quenching tank under the control of a third-section coke pusher after being subjected to material distribution through a coke discharging material distributor; the system can fully recover the heat of the semicoke, the final cooling temperature of the semicoke is low, and the semicoke can be directly discharged to a coke conveying system.

Description

Technical Field

[0001] The present invention relates to the technical field of low-rank coal carbonization, and particularly relates to a multi-stage semi-coke deep cooling and coke discharging system and method. Background Art

[0002] Low-rank coal resources are characterized by shallow burial, large reserves, and low mining costs. The geological reserves of low-rank coal in the world are about 4 trillion tons, accounting for about 40% of the total world coal reserves. At present, high-quality coal resources such as bituminous coal and anthracite in China have been fully utilized, and the large-scale development and utilization of low-rank coal has just begun.

[0003] At present, the internal heating vertical furnace is mainly used to upgrade low-rank coal, that is, a mixture of gas and air is introduced into the furnace, and combustion occurs in the furnace for carbonization. The semi-coke formed after carbonization is discharged after cooling. At present, the semi-coke cooling methods include the wet coke quenching process and the dry coke quenching process. The traditional wet coke quenching process is to directly discharge the high-temperature semi-coke into the water quenching box filled with water for cooling. However, a large amount of steam will be generated when the semi-coke meets water, seriously polluting the environment, and the heat of the semi-coke is not effectively recovered. In recent years, with the increasingly strict environmental protection requirements, newly built internal heating vertical furnaces have all adopted the dry coke quenching process. The specific process is as follows: The semi-coke obtained by carbonization in the pyrolysis furnace first enters the water-cooled wall heat exchanger and is cooled to 300 °C. The steam generated by heat exchange is sent to other areas of the plant for utilization as a heat source. The semi-coke after heat exchange falls into the coke quenching tank under the control of the coke pusher. A water spray coke quenching cooling system is arranged in the coke quenching tank to further cool the semi-coke so that the temperature of the semi-coke reaches the required temperature. However, affected by factors such as the heat exchange efficiency of the water-cooled wall and the poor thermal conductivity of coal, the heat of the semi-coke is not effectively recovered in the above process, and the water content of the coke directly affects its selling price. Therefore, this process still has room for further optimization.

[0004] Chinese patent application with the publication number of CN118792065A discloses "a multi-stage semi-coke cooling and coke discharging system and method". Two-stage water-cooled wall heat exchangers, two-stage coke pushers and coke supporting plates are successively arranged at the bottom of the coke discharging port of the carbonization furnace. After passing through the first-stage water-cooled wall heat exchanger, the semi-coke is mixed and heat-exchanged by the first-stage coke pusher to reduce the temperature difference between the side-wall semi-coke and the central semi-coke, and then enters the second-stage water-cooled wall heat exchanger to continue heat exchange and recover heat. After deep heat exchange, the semi-coke is controlled by the second-stage coke pusher and coke supporting plate to control the flow rate, and then is sent out by the scraper conveyor. The system has a simple structure and convenient operation, fully improves the heat transfer coefficient of the semi-coke, and has a high semi-coke heat recovery efficiency. However, it is found in actual application that the semi-coke cooling and coke discharging temperature is still greater than 140 °C, and further cooling is required to be sent to the coke conveying system. Summary of the Invention

[0005] The present invention provides a multi-stage semi-coke deep cooling coke discharging system and method, which further improves the existing multi-stage semi-coke cooling coke discharging system. A three-stage semi-coke cooling external heat exchanger is arranged at the bottom of the coke discharging port of the retort furnace. After the semi-coke exchanges heat with the first-stage steam generator, it is discharged into the second-stage water-cooled wall heat exchanger under the control of the first-stage coke pusher. After being cooled in the second stage, the semi-coke enters the third-stage water-cooled wall heat exchanger after being distributed by the coke discharging distributor, and finally is discharged into the quenching tank under the control of the third-stage coke pusher; the system can recover the heat of the semi-coke more fully, and the final temperature of the semi-coke cooling is low, and it can be directly discharged to the coke conveying system.

[0006] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0007] A multi-stage semi-coke deep cooling coke discharging system includes a first-stage semi-coke cooling coke discharging device, a second-stage semi-coke cooling device, a coke discharging distributor, a third-stage semi-coke cooling coke discharging device, a quenching tank and a scraper conveyor; the first-stage semi-coke cooling coke discharging device, the second-stage semi-coke cooling device, the third-stage semi-coke cooling coke discharging device and the quenching tank are arranged at the bottom of the vertical furnace from top to bottom in sequence; a plurality of coke discharging ports arranged in a straight line are provided at the bottom of the vertical furnace; the first-stage semi-coke cooling coke discharging device is composed of a plurality of first-stage steam generators and a first-stage semi-coke discharging mechanism; the second-stage semi-coke cooling device is composed of a plurality of second-stage water-cooled wall heat exchangers; a humidity adjusting nozzle is arranged in the coke discharging distributor; the third-stage semi-coke cooling coke discharging device is composed of a plurality of third-stage water-cooled wall heat exchangers and a third-stage semi-coke discharging mechanism; the semi-coke inlet 1 at the top of the first-stage steam generator is arranged in one-to-one correspondence with the coke discharging port at the bottom of the vertical furnace, and the semi-coke outlet 1 at the bottom of the first-stage steam generator is connected to the semi-coke inlet 2 at the top of the corresponding second-stage water-cooled wall heat exchanger through the first-stage semi-coke discharging mechanism, and the semi-coke outlet 1 and the semi-coke inlet 2 are arranged in a staggered manner; the semi-coke outlet 2 at the bottom of the second-stage water-cooled wall heat exchanger is connected to the semi-coke inlet 3 at the top of the corresponding third-stage water-cooled wall heat exchanger through the coke discharging distributor, and the semi-coke outlet 2 and the semi-coke inlet 3 are arranged in a staggered manner; the semi-coke outlet 3 at the bottom of the third-stage water-cooled wall heat exchanger is connected to the semi-coke inlet at the top of the quenching tank through the third-stage semi-coke discharging mechanism, and a scraper conveyor is arranged at the bottom of the quenching tank.

[0008] The said first-stage steam generator is fixed on the bottom girder of the vertical furnace; the first-stage semicoke discharging mechanism consists of a first-stage sealed box body, a first-stage coke supporting plate and a first-stage coke pusher; the first-stage sealed box body is arranged between the first-stage steam generator and the second-stage water-cooled wall heat exchanger; the semicoke outlet one of the first-stage steam generator is communicated with the top opening of the corresponding first-stage sealed box body through a high-temperature expansion joint, and the bottom opening of the first-stage sealed box body is communicated with the semicoke inlet two of the corresponding second-stage water-cooled wall heat exchanger; the first-stage coke pusher consists of a first-stage coke pushing plate, a first-stage coke pushing rod and a first-stage coke pushing driving device, the first-stage coke supporting plate and the first-stage coke pushing plate are both arranged in the first-stage sealed box body, the first-stage coke supporting plate is arranged directly below the semicoke outlet one in one-to-one correspondence, the first-stage coke pushing plate and the first-stage coke supporting plate are arranged above the side of the first-stage coke supporting plate in one-to-one correspondence, a plurality of first-stage coke pushing plates are connected by the first-stage coke pushing rod, and one end of the first-stage coke pushing rod passes through the first-stage sealed box body and is connected with the first-stage coke pushing driving device.

[0009] The said coke discharging distributor consists of a plurality of V-shaped coke discharging channels, two semicoke inlets are arranged at the top of each V-shaped coke discharging channel and are respectively communicated with the corresponding one semicoke outlet two, and one semicoke outlet is arranged at the bottom of each V-shaped coke discharging channel and is communicated with the corresponding one semicoke inlet three; humidity adjusting nozzles are respectively arranged at the centers of the tops of each V-shaped coke discharging channels; a material distributing adjusting plate is arranged between two adjacent V-shaped coke discharging channels.

[0010] The said third-stage semicoke discharging mechanism consists of a third-stage sealed box body, a third-stage coke supporting plate and a third-stage coke pusher; the third-stage sealed box body is arranged between the third-stage water-cooled wall heat exchanger and the quenching tank; the semicoke outlet three of the third-stage water-cooled wall heat exchanger is communicated with the top opening of the corresponding third-stage sealed box body through a medium-temperature expansion joint, and the bottom opening of the third-stage sealed box body is communicated with the semicoke inlet at the top of the corresponding quenching tank; the third-stage coke pusher consists of a third-stage coke pushing plate, a third-stage coke pushing rod and a third-stage coke pushing driving device, the third-stage coke supporting plate and the third-stage coke pushing plate are both arranged in the third-stage sealed box body, the third-stage coke supporting plate is arranged directly below the semicoke outlet three in one-to-one correspondence, the third-stage coke pushing plate and the third-stage coke supporting plate are arranged above the side of the third-stage coke supporting plate in one-to-one correspondence, a plurality of third-stage coke pushing plates are connected by the third-stage coke pushing rod, and one end of the third-stage coke pushing rod passes through the third-stage sealed box body and is connected with the third-stage coke pushing driving device.

[0011] The said first-stage steam generator is composed of a steam drum, a total circulation inlet pipe, a first-stage steam generator inlet pipe, an outer wall of the first-stage steam generator, an inner wall of the first-stage steam generator, a first-stage steam generator outlet pipe, and a total circulation outlet pipe; the outer wall of the first-stage steam generator and the inner wall of the first-stage steam generator are both composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the first-stage steam generator into multiple first-stage semi-coke feeding channels; the bottom circulating water inlets of the outer wall of the first-stage steam generator and the inner wall of the first-stage steam generator are respectively connected to the circulating water outlet of the steam drum through the first-stage steam generator inlet pipe and the total circulation inlet pipe; the top circulating water outlets of the outer wall of the first-stage steam generator and the inner wall of the first-stage steam generator are respectively connected to the circulating water inlet of the steam drum through the first-stage steam generator outlet pipe and the total circulation outlet pipe.

[0012] The length of the said first-stage steam generator is 3200 - 4200 mm, the width is 420 - 720 mm, and the height is 1800 - 2500 mm; the inner wall of the first-stage steam generator is arranged at intervals of 250 - 700 mm along the longitudinal direction of the first-stage steam generator.

[0013] The said second-stage water-cooled wall heat exchanger is composed of a second-stage water-cooled wall heat exchanger inlet pipe, an outer wall of the second-stage water-cooled wall heat exchanger, an inner wall of the second-stage water-cooled wall heat exchanger, and a second-stage water-cooled wall heat exchanger outlet pipe; the said third-stage water-cooled wall heat exchanger is composed of a third-stage water-cooled wall heat exchanger inlet pipe, an outer wall of the third-stage water-cooled wall heat exchanger, an inner wall of the third-stage water-cooled wall heat exchanger, and a third-stage water-cooled wall heat exchanger outlet pipe; the outer wall of the second-stage water-cooled wall heat exchanger and the inner wall of the second-stage water-cooled wall heat exchanger are both composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the second-stage water-cooled wall heat exchanger into multiple second-stage semi-coke feeding channels; the outer wall of the third-stage water-cooled wall heat exchanger and the inner wall of the third-stage water-cooled wall heat exchanger are both composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the third-stage water-cooled wall heat exchanger into multiple third-stage semi-coke feeding channels; the bottom cooling water inlets of the outer wall of the second-stage water-cooled wall heat exchanger and the inner wall of the second-stage water-cooled wall heat exchanger are respectively connected to the total cooling water inlet pipe through the second-stage water-cooled wall heat exchanger inlet pipe, and the bottom cooling water inlets of the outer wall of the third-stage water-cooled wall heat exchanger and the inner wall of the third-stage water-cooled wall heat exchanger are respectively connected to the total cooling water inlet pipe through the third-stage water-cooled wall heat exchanger inlet pipe, and the total cooling water inlet pipe is additionally connected to the circulating water outlet of the cooling tower; the top cooling water inlets of the outer wall of the second-stage water-cooled wall heat exchanger and the inner wall of the second-stage water-cooled wall heat exchanger are respectively connected to the total cooling water outlet pipe through the second-stage water-cooled wall heat exchanger outlet pipe, and the top cooling water inlets of the outer wall of the third-stage water-cooled wall heat exchanger and the inner wall of the third-stage water-cooled wall heat exchanger are respectively connected to the total cooling water outlet pipe through the third-stage water-cooled wall heat exchanger outlet pipe, and the total cooling water outlet pipe is additionally connected to the circulating water inlet of the cooling tower.

[0014] The lengths of the second-stage water-cooled wall heat exchanger and the third-stage water-cooled wall heat exchanger are both 3600 - 4800 mm, the widths are both 200 - 620 mm, and the heights are both 1500 - 3000 mm; the inner walls of the second-stage water-cooled wall heat exchanger are arranged longitudinally at intervals of 200 - 600 mm along the second-stage water-cooled wall heat exchanger; the inner walls of the third-stage water-cooled wall heat exchanger are arranged longitudinally at intervals of 200 - 600 mm along the third-stage water-cooled wall heat exchanger.

[0015] A multi-stage semi-coke deep cooling coke discharging method includes the following steps:

[0016] 1) The semi-coke with a temperature of 620 - 670 °C after being carbonized to maturity in the vertical furnace is discharged into the first-stage steam generator through the coke discharging port at the bottom of the vertical furnace for primary cooling; in the first-stage steam generator, the circulating water with a temperature of 180 - 250 °C led out from the steam drum enters the first-stage steam generator inlet pipe through the circulating inlet main pipe, exchanges heat with the semi-coke through the outer wall and the inner wall of the first-stage steam generator, and the generated steam returns to the steam drum through the circulating outlet main pipe to recover the waste heat of the high-temperature semi-coke; the semi-coke after primary cooling falls onto the first-stage coke supporting plate, and the coke discharging speed and the temperature of the semi-coke after primary cooling are controlled by the first-stage coke pusher; the temperature of the semi-coke at the side wall of the first-stage semi-coke feeding channel is controlled at 100 - 150 °C, and the temperature of the semi-coke at the center of the first-stage semi-coke feeding channel is controlled at 600 - 650 °C;

[0017] 2) After being pushed by the first-stage coke pusher, part of the semi-coke is mixed evenly, and the first-stage coke pusher discharges the semi-coke into the second-stage water-cooled wall heat exchanger for secondary cooling; the first-stage semi-coke feeding channel of the first-stage steam generator and the second-stage semi-coke feeding channel of the second-stage water-cooled wall heat exchanger are arranged in a staggered manner. The semi-coke at the edge position in the first-stage semi-coke feeding channel is located at the center position of the second-stage semi-coke feeding channel after entering the second-stage water-cooled wall heat exchanger, and the semi-coke at the center position in the first-stage semi-coke feeding channel is located at the edge position of the second-stage semi-coke feeding channel after entering the second-stage water-cooled wall heat exchanger; the circulating cooling water at 30 °C - 45 °C from the cooling tower is divided into two paths after passing through the cooling water inlet main pipe. One path enters the outer wall and the inner wall of the second-stage water-cooled wall heat exchanger through the second-stage water-cooled wall heat exchanger inlet pipe, and the other path enters the outer wall and the inner wall of the third-stage water-cooled wall heat exchanger through the third-stage water-cooled wall heat exchanger inlet pipe; the cooling water after fully exchanging heat with the semi-coke is respectively collected through the second-stage water-cooled wall heat exchanger outlet pipe and the third-stage water-cooled wall heat exchanger outlet pipe into the cooling water outlet main pipe and then returns to the cooling tower; the temperature of the circulating cooling water after heat exchange is controlled at 40 - 55 °C; the temperature of the semi-coke after being cooled by the second-stage water-cooled wall heat exchanger is controlled as follows: the temperature of the semi-coke at the side wall of the second-stage semi-coke feeding channel is 120 - 180 °C, and the temperature of the semi-coke at the center of the second-stage semi-coke feeding channel is 50 - 200 °C; the average temperature at the semi-coke outlet of the second-stage water-cooled wall heat exchanger is controlled at 100 - 180 °C;

[0018] 3) The semicoke after secondary cooling enters the three-stage water-cooled wall heat exchanger through the coke discharging and distributing device for tertiary cooling. The coke discharging and distributing device is provided with a distributing and adjusting plate for evenly distributing the semicoke discharged from the secondary water-cooled wall heat exchanger to the outlet of each V-shaped coke discharging channel. Since the secondary semicoke feeding channel and the tertiary semicoke feeding channel are arranged in a staggered manner, the semicoke at the edge position in the tertiary semicoke feeding channel is located at the center position of the tertiary semicoke feeding channel after entering the three-stage water-cooled wall heat exchanger, and the semicoke at the center position in the secondary semicoke feeding channel is located at the edge position of the tertiary semicoke feeding channel after entering the three-stage water-cooled wall heat exchanger. A humidity adjusting nozzle is provided at the center of each coke discharging and distributing device to supplement and adjust the humidity of the semicoke by spraying water for gasification. The temperature of the semicoke after being cooled by the three-stage water-cooled wall heat exchanger is controlled as follows: the temperature of the semicoke at the side wall of the tertiary semicoke feeding channel is 50 - 70°C, and the temperature of the semicoke at the center of the tertiary semicoke feeding channel is 70 - 140°C; the average temperature at the semicoke outlet of the three-stage water-cooled wall heat exchanger is controlled at 60 - 80°C;

[0019] 4) The semicoke after tertiary cooling falls onto the tertiary coke supporting plate, and the coke discharging speed and the temperature of the semicoke after tertiary cooling are controlled by the tertiary coke pusher. The tertiary coke pusher discharges the semicoke into the quenching trough, and the cooled semicoke is sent out to the coke treatment system through the scraper conveyor arranged at the bottom of the quenching trough.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The existing multi-stage semicoke cooling and coke discharging system is further improved. A three-stage semicoke cooling external heat type cooling device is arranged at the bottom of the coke discharging port of the retort furnace. After the semicoke is heat-exchanged by the first-stage steam generator, it is discharged into the secondary water-cooled wall heat exchanger by the first-stage coke pusher. After the secondary cooling, the semicoke enters the three-stage water-cooled wall heat exchanger after being distributed by the coke discharging and distributing device, and finally is discharged into the quenching trough by the control of the tertiary coke pusher; the system can recover the heat of the semicoke more fully, and the final temperature of the semicoke cooling is low, and it can be directly discharged to the coke conveying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the front view of a multi-stage semicoke deep cooling and coke discharging system according to the present invention.

[0023] Figure 2 is Figure 1 the side view of

[0024] Figure 3 is the cross-sectional view of the first-stage steam generator according to the present invention.

[0025] Figure 4 is the cross-sectional view of the secondary water-cooled wall heat exchanger according to the present invention.

[0026] Figure 5It is a cross-sectional view of the three-stage water-cooled wall heat exchanger of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the coke discharging distributor of the present invention.

[0028] In the figure: 1. First-stage steam generator; 2. High-temperature expansion joint; 3. First-stage coke pusher; 4. First-stage coke supporting plate; 5. Second-stage water-cooled wall heat exchanger; 6. Coke discharging distributor; 7. Third-stage water-cooled wall heat exchanger; 8. Medium-temperature expansion joint; 9. Third-stage coke pusher; 10. Third-stage coke supporting plate; 11. Quenching trough; 12. Scraper conveyor; 101. Circulation inlet main pipe; 102. First-stage steam generator inlet pipe; 103. Outer wall of the first-stage steam generator; 104. Inner wall of the first-stage steam generator; 105. First-stage steam generator outlet pipe; 106. Circulation outlet main pipe; 201. Cooling water inlet main pipe; 202. Second-stage water-cooled wall heat exchanger inlet pipe; 203. Outer wall of the second-stage water-cooled wall heat exchanger; 204. Inner wall of the second-stage water-cooled wall heat exchanger; 205. Second-stage water-cooled wall heat exchanger outlet pipe; 206. Third-stage water-cooled wall heat exchanger inlet pipe; 207. Outer wall of the third-stage water-cooled wall heat exchanger; 208. Inner wall of the third-stage water-cooled wall heat exchanger; 209. Third-stage water-cooled wall heat exchanger outlet pipe; 210. Cooling water outlet main pipe; 301. Humidifying nozzle; 302. Feeding adjustment plate Specific embodiments

[0029] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings:

[0030] Such as Figures 1-6As shown in the figure, a multi-stage semi-coke deep cooling coke discharging system according to the present invention includes a first-stage semi-coke cooling coke discharging device, a second-stage semi-coke cooling device, a coke discharging distributor 6, a third-stage semi-coke cooling coke discharging device, a quenching tank 11 and a scraper conveyor 12; the first-stage semi-coke cooling coke discharging device, the second-stage semi-coke cooling device, the third-stage semi-coke cooling coke discharging device and the quenching tank 11 are sequentially arranged from top to bottom at the bottom of the vertical furnace; a plurality of coke discharging ports arranged in a straight line are provided at the bottom of the vertical furnace; the first-stage semi-coke cooling coke discharging device is composed of a plurality of first-stage steam generators 1 and a first-stage semi-coke discharging mechanism; the second-stage semi-coke cooling device is composed of a plurality of second-stage water-cooled wall heat exchangers 5; a humidity adjusting nozzle 301 is arranged in the coke discharging distributor 6; the third-stage semi-coke cooling coke discharging device is composed of a plurality of third-stage water-cooled wall heat exchangers 7 and a third-stage semi-coke discharging mechanism; the semi-coke inlet 1 at the top of the first-stage steam generator 1 corresponds to the coke discharging port at the bottom of the vertical furnace one by one, and the semi-coke outlet 1 at the bottom of the first-stage steam generator 1 is connected to the semi-coke inlet 2 at the top of the corresponding second-stage water-cooled wall heat exchanger 5 through the first-stage semi-coke discharging mechanism, and the semi-coke outlet 1 and the semi-coke inlet 2 are arranged in a staggered manner; the semi-coke outlet 2 at the bottom of the second-stage water-cooled wall heat exchanger 5 is connected to the semi-coke inlet 3 at the top of the corresponding third-stage water-cooled wall heat exchanger 7 through the coke discharging distributor 6, and the semi-coke outlet 2 and the semi-coke inlet 3 are arranged in a staggered manner; the semi-coke outlet 3 at the bottom of the third-stage water-cooled wall heat exchanger 7 is connected to the semi-coke inlet at the top of the quenching tank 11 through the third-stage semi-coke discharging mechanism, and a scraper conveyor 12 is arranged at the bottom of the quenching tank 11.

[0031] The first-stage steam generator 1 is fixed on the bottom girder of the vertical furnace; the first-stage semi-coke discharging mechanism is composed of a first-stage sealed box body, a first-stage coke supporting plate 4 and a first-stage coke pusher 3; the first-stage sealed box body is arranged between the first-stage steam generator 1 and the second-stage water-cooled wall heat exchanger 5; the semi-coke outlet 1 of the first-stage steam generator 1 is communicated with the top opening of the corresponding first-stage sealed box body through a high-temperature expansion joint 2, and the bottom opening of the first-stage sealed box body is communicated with the semi-coke inlet 2 of the corresponding second-stage water-cooled wall heat exchanger 5; the first-stage coke pusher is composed of a first-stage coke pushing plate, a first-stage coke pushing rod and a first-stage coke pushing driving device, the first-stage coke supporting plate and the first-stage coke pushing plate are both arranged in the first-stage sealed box body, the first-stage coke supporting plate 4 is arranged directly below the semi-coke outlet 1 one by one, the first-stage coke pushing plate and the first-stage coke supporting plate 4 are arranged above the side of the first-stage coke supporting plate 4 one by one, a plurality of first-stage coke pushing plates are connected by a first-stage coke pushing rod, and one end of the first-stage coke pushing rod passes through the first-stage sealed box body and is connected to the first-stage coke pushing driving device.

[0032] The coke discharging distributor 6 is composed of a plurality of V-shaped coke discharging channels, two semi-coke inlets are arranged at the top of each V-shaped coke discharging channel and are respectively communicated with one corresponding semi-coke outlet 2, and one semi-coke outlet is arranged at the bottom of each V-shaped coke discharging channel and is communicated with one corresponding semi-coke inlet 3; a humidity adjusting nozzle 301 is arranged at the center of each V-shaped coke discharging channel at the top of the channel; a material distribution adjusting plate 302 is arranged between two adjacent V-shaped coke discharging channels.

[0033] The three-section semicoke discharging mechanism is composed of a three-section sealed box body, three-section coke supporting plates 10 and a three-section coke pusher 9; the three-section sealed box body is arranged between the three-section water-cooled wall heat exchanger 7 and the quenching trough 11; the semicoke outlet three of the three-section water-cooled wall heat exchanger 7 is communicated with the top opening of the corresponding three-section sealed box body through a medium-temperature expansion joint 8, and the bottom opening of the three-section sealed box body is communicated with the top semicoke inlet of the corresponding quenching trough 11; the three-section coke pusher 9 is composed of three-section coke pushing plates, three-section coke pushing rods and three-section coke pushing driving devices. The three-section coke supporting plates 10 and the three-section coke pushing plates are arranged in the three-section sealed box body. The three-section coke supporting plates 10 are arranged directly below the semicoke outlet three one by one. The three-section coke pushing plates and the three-section coke supporting plates 10 are arranged above the sides of the three-section coke supporting plates 10 one by one. A plurality of three-section coke pushing plates are connected by three-section coke pushing rods. One end of the three-section coke pushing rod passes through the three-section sealed box body and is connected with the three-section coke pushing driving device.

[0034] The first-stage steam generator 1 is composed of a steam drum, a circulation inlet main pipe 101, a first-stage steam generator inlet pipe 102, a first-stage steam generator outer wall 103, a first-stage steam generator inner wall 103, a first-stage steam generator outlet pipe 105, and a circulation outlet main pipe 106; the first-stage steam generator outer wall 103 and the first-stage steam generator inner wall 104 are both composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the first-stage steam generator 1 into multiple first-stage semicoke feeding channels; the bottom circulating water inlets of the first-stage steam generator outer wall 103 and the first-stage steam generator inner wall 104 are respectively connected to the circulating water outlet of the steam drum through the first-stage steam generator inlet pipe 102 and the circulation inlet main pipe 101; the top circulating water outlets of the first-stage steam generator outer wall 103 and the first-stage steam generator inner wall 104 are respectively connected to the circulating water inlet of the steam drum through the first-stage steam generator outlet pipe 105 and the circulation outlet main pipe 106.

[0035] The length of the first-stage steam generator 1 is 3200 - 4200 mm, the width is 420 - 720 mm, and the height is 1800 - 2500 mm; the first-stage steam generator inner wall 104 is arranged at intervals of 250 - 700 mm along the longitudinal direction of the first-stage steam generator 1.

[0036] The two-stage water-cooled wall heat exchanger 5 is composed of an inlet pipe 202 of the two-stage water-cooled wall heat exchanger, an outer wall 203 of the two-stage water-cooled wall heat exchanger, an inner wall 204 of the two-stage water-cooled wall heat exchanger, and an outlet pipe 205 of the two-stage water-cooled wall heat exchanger; the three-stage water-cooled wall heat exchanger 7 is composed of an inlet pipe 206 of the three-stage water-cooled wall heat exchanger, an outer wall 207 of the three-stage water-cooled wall heat exchanger, an inner wall 208 of the three-stage water-cooled wall heat exchanger, and an outlet pipe 209 of the three-stage water-cooled wall heat exchanger; the outer wall 203 of the two-stage water-cooled wall heat exchanger and the inner wall 204 of the two-stage water-cooled wall heat exchanger are each composed of a plurality of vertically arranged seamless steel pipes, dividing the internal space of the two-stage water-cooled wall heat exchanger 5 into a plurality of two-stage semicoke feeding channels; the outer wall 207 of the three-stage water-cooled wall heat exchanger and the inner wall 208 of the three-stage water-cooled wall heat exchanger are each composed of a plurality of vertically arranged seamless steel pipes, dividing the internal space of the three-stage water-cooled wall heat exchanger 7 into a plurality of three-stage semicoke feeding channels; the bottom cooling water inlets of the outer wall 203 of the two-stage water-cooled wall heat exchanger and the inner wall 204 of the two-stage water-cooled wall heat exchanger are respectively connected to the main cooling water inlet pipe 201 through the inlet pipe 202 of the two-stage water-cooled wall heat exchanger, and the bottom cooling water inlets of the outer wall 207 of the three-stage water-cooled wall heat exchanger and the inner wall 208 of the three-stage water-cooled wall heat exchanger are respectively connected to the main cooling water inlet pipe 201 through the inlet pipe 206 of the three-stage water-cooled wall heat exchanger, and the main cooling water inlet pipe 201 is additionally connected to the circulating water outlet of the cooling tower; the top cooling water inlets of the outer wall 203 of the two-stage water-cooled wall heat exchanger and the inner wall 204 of the two-stage water-cooled wall heat exchanger are respectively connected to the main cooling water outlet pipe 210 through the outlet pipe 205 of the two-stage water-cooled wall heat exchanger, and the top cooling water inlets of the outer wall 207 of the three-stage water-cooled wall heat exchanger and the inner wall 208 of the three-stage water-cooled wall heat exchanger are respectively connected to the main cooling water outlet pipe 210 through the outlet pipe 209 of the three-stage water-cooled wall heat exchanger, and the main cooling water outlet pipe 210 is additionally connected to the circulating water inlet of the cooling tower.

[0037] The lengths of both the two-stage water-cooled wall heat exchanger 5 and the three-stage water-cooled wall heat exchanger 7 are 3600 - 4800 mm, the widths are both 200 - 620 mm, and the heights are both 1500 - 3000 mm; the inner wall 204 of the two-stage water-cooled wall heat exchanger is arranged at intervals of 200 - 600 mm along the longitudinal direction of the two-stage water-cooled wall heat exchanger 5; the inner wall 208 of the three-stage water-cooled wall heat exchanger is arranged at intervals of 200 - 600 mm along the longitudinal direction of the three-stage water-cooled wall heat exchanger 7.

[0038] A multi-stage semicoke deep cooling and discharging method includes the following steps:

[0039] 1) The semi-coke with a temperature of 620 - 670 °C after dry distillation and maturation in the vertical furnace is discharged into the first-stage steam generator 1 through the coke discharging port at the bottom of the vertical furnace for primary cooling. In the first-stage steam generator 1, the circulating water with a temperature of 180 - 250 °C led out from the steam drum enters the inlet pipe of the first-stage steam generator 102 through the main circulating inlet pipe 101, exchanges heat with the semi-coke through the outer wall 103 and the inner wall 104 of the first-stage steam generator, and the generated steam returns to the steam drum through the main circulating outlet pipe 106 to recover the waste heat of the high-temperature semi-coke. The semi-coke after primary cooling falls onto the first-stage coke supporting plate 4, and the coke discharging speed and the temperature of the semi-coke after primary cooling are controlled by the first-stage coke pusher 3. The temperature of the semi-coke at the side wall of the first-stage semi-coke feeding channel is controlled at 100 - 150 °C, and the temperature of the semi-coke at the center of the first-stage semi-coke feeding channel is controlled at 600 - 650 °C.

[0040] 2) After being pushed by the first-stage coke pusher 3, part of the semi-coke is mixed evenly, and the first-stage coke pusher 3 discharges the semi-coke into the second-stage water-cooled wall heat exchanger 5 for secondary cooling. The first-stage semi-coke feeding channel of the first-stage steam generator 1 and the second-stage semi-coke feeding channel of the second-stage water-cooled wall heat exchanger 5 are arranged in a staggered manner. The semi-coke at the edge position in the first-stage semi-coke feeding channel is located at the center position of the second-stage semi-coke feeding channel after entering the second-stage water-cooled wall heat exchanger 5, and the semi-coke at the center position in the first-stage semi-coke feeding channel is located at the edge position of the second-stage semi-coke feeding channel after entering the second-stage water-cooled wall heat exchanger 5. The circulating cooling water with a temperature of 30 - 45 °C from the cooling tower is divided into two paths after passing through the main cooling water inlet pipe 201. One path enters the outer wall 203 and the inner wall 204 of the second-stage water-cooled wall heat exchanger through the inlet pipe 202 of the second-stage water-cooled wall heat exchanger, and the other path enters the outer wall 207 and the inner wall 208 of the third-stage water-cooled wall heat exchanger through the inlet pipe 206 of the third-stage water-cooled wall heat exchanger. The cooling water that has fully exchanged heat with the semi-coke is respectively collected into the main cooling water outlet pipe 210 through the outlet pipe 205 of the second-stage water-cooled wall heat exchanger and the outlet pipe 209 of the third-stage water-cooled wall heat exchanger and then returns to the cooling tower. The temperature of the circulating cooling water after heat exchange is controlled at 40 - 55 °C. The temperature of the semi-coke after being cooled by the second-stage water-cooled wall heat exchanger 5 is controlled as follows: the temperature of the semi-coke at the side wall of the second-stage semi-coke feeding channel is 120 - 180 °C, and the temperature of the semi-coke at the center of the second-stage semi-coke feeding channel is 50 - 200 °C. The average temperature at the semi-coke outlet of the second-stage water-cooled wall heat exchanger 5 is controlled at 100 - 180 °C.

[0041] 3) The semicoke after secondary cooling enters the three-stage water-cooled wall heat exchanger 7 through the coke discharging and distributing device 6 for tertiary cooling; a distributing and adjusting plate 302 is provided in the coke discharging and distributing device 6 for evenly distributing the semicoke discharged from the secondary water-cooled wall heat exchanger 5 to the outlets of each V-shaped coke discharging channel. Since the secondary semicoke feeding channel and the tertiary semicoke feeding channel are arranged in a staggered manner, the semicoke at the edge position in the tertiary semicoke feeding channel is located at the center position of the tertiary semicoke feeding channel after entering the three-stage water-cooled wall heat exchanger 7, and the semicoke at the center position in the secondary semicoke feeding channel is located at the edge position of the tertiary semicoke feeding channel after entering the three-stage water-cooled wall heat exchanger 7; a humidity adjusting spray head 301 is provided at the center of each coke discharging and distributing device 6 for supplementary humidity adjustment of the semicoke by means of water spraying and gasification; the temperature of the semicoke after being cooled by the three-stage water-cooled wall heat exchanger 7 is controlled as follows: the temperature of the semicoke at the side wall of the tertiary semicoke feeding channel is 50 - 70 °C, and the temperature of the semicoke at the center of the tertiary semicoke feeding channel is 70 - 140 °C; the average temperature at the semicoke outlet of the three-stage water-cooled wall heat exchanger 7 is controlled at 60 - 80 °C;

[0042] 4) The semicoke after tertiary cooling falls onto the tertiary coke supporting plate 10, and the coke discharging speed and the temperature of the semicoke after tertiary cooling are controlled by the three-stage coke pusher 9; the three-stage coke pusher 9 discharges the semicoke into the quenching tank 11, and the cooled semicoke is sent out to the coke treatment system through the scraper conveyor 12 provided at the bottom of the quenching tank 11.

[0043] To more intuitively illustrate the present invention, the embodiments of the present invention will be further described in combination with the examples. The following examples are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solutions that can be obviously obtained by those skilled in the art within the technical scope disclosed by the present invention, including simple changes or equivalent replacements, are within the protection scope of the present invention.

[0044]

Example

[0045] In this example, the multi-stage semicoke deep cooling and coke discharging system includes: a primary steam generator 1, a high-temperature expansion joint 2, a primary coke pusher 3, a primary coke supporting plate 4, a secondary water-cooled wall heat exchanger 5, a coke discharging and distributing device 6, a three-stage water-cooled wall heat exchanger 7, a medium-temperature expansion joint 8, a secondary coke pusher 9, a secondary coke supporting plate 10, a quenching tank 11, a scraper conveyor 12, etc.

[0046] At the coke discharging port at the bottom of each vertical furnace, a primary steam generator 1 is correspondingly arranged. The primary steam generator 1 is fixed on the bottom girder of the vertical furnace. The semi-coke after dry distillation and maturation is discharged into the primary steam generator 1 through the coke discharging port at the bottom of the vertical furnace. A high-temperature expansion joint 2 is arranged at the bottom of the primary steam generator 1. At the bottom of the high-temperature expansion joint 2, a primary coke pusher 3 and a primary coke supporting plate 4 are arranged. The semi-coke after primary cooling falls onto the primary coke supporting plate 4. After controlling the coke discharging speed and heat exchange degree through the primary coke pusher 3, it successively falls into the secondary water-cooled wall heat exchanger 5 and the tertiary water-cooled wall heat exchanger 7 for continuous heat exchange and cooling. The secondary water-cooled wall heat exchanger 5 and the tertiary water-cooled wall heat exchanger 7 are connected through a coke discharging distributor 6. Each coke discharging distributor 6 has a structure of one inlet and two outlets. The semi-coke outlet 2 of each secondary water-cooled wall heat exchanger 5 is connected to the semi-coke inlet 3 of the corresponding 2 tertiary water-cooled wall heat exchangers 7. A medium-temperature expansion joint 8 is arranged at the bottom of the tertiary water-cooled wall heat exchanger 7. The semi-coke after secondary cooling falls onto the tertiary coke supporting plate 10, and the coke discharging speed and heat exchange degree are controlled through the tertiary coke pusher 9, and finally it falls into the quenching trough 11. A scraper conveyor 12 is arranged at the bottom of the quenching trough 11 to externally transport the cooled semi-coke to the coke treatment system.

[0047] The primary steam generator 1 includes a primary steam generator inlet pipe 102, a primary steam generator outer wall 103, a primary steam generator inner wall 104, a primary steam generator outlet pipe 105, as well as a steam drum and a circulation inlet main pipe 101 and a circulation outlet main pipe 106. Both the primary steam generator outer wall 103 and the primary steam generator inner wall 104 are formed by closely arranging multiple seamless steel pipes. Demineralized water is introduced into the seamless steel pipes for heat exchange with the high-temperature semi-coke to realize the recovery of the waste heat of the high-temperature semi-coke. The circulating water led out from the steam drum has a temperature of 190 °C, enters the primary steam generator inlet pipe 102 through the circulation inlet main pipe 101, and then respectively enters the primary steam generator outer wall 103 and the primary steam generator inner wall 104. The steam generated after fully exchanging heat with the semi-coke to cool the semi-coke returns to the steam drum through the circulation outlet main pipe 106.

[0048] In this embodiment, the cross-sectional shape and size of the primary steam generator 1 are consistent with the coke discharging port at the bottom of the vertical furnace. The length is 3800 mm, the width is 630 mm. The height of the primary steam generator 1 is 2200 mm. The primary steam generator inner wall 104 is arranged at an interval of 600 mm inside the primary steam generator.

[0049] The two-stage water-cooled wall heat exchanger 5 and the three-stage water-cooled wall heat exchanger 7 include a cooling water inlet main pipe 210, a two-stage water-cooled wall heat exchanger inlet pipe 202, a two-stage water-cooled wall heat exchanger outer wall 203, a two-stage water-cooled wall heat exchanger inner wall 204, a two-stage water-cooled wall heat exchanger outlet pipe 205, a three-stage water-cooled wall heat exchanger inlet pipe 206, a three-stage water-cooled wall heat exchanger outer wall 207, a three-stage water-cooled wall heat exchanger inner wall 208, a three-stage water-cooled wall heat exchanger outlet pipe 209, and a cooling water outlet main pipe 210. The two-stage water-cooled wall heat exchanger outer wall 203 and the three-stage water-cooled wall heat exchanger outer wall 207 are both formed by a plurality of seamless steel pipes arranged closely, and the two-stage water-cooled wall heat exchanger inner wall 204 and the three-stage water-cooled wall heat exchanger inner wall 208 are also formed by a plurality of seamless steel pipes arranged closely, and desalted water is passed into the seamless steel pipes for heat exchange with hot semi-coke to recover the remaining heat. The 30°C circulating cooling water from the cooling tower is divided into two paths after passing through the cooling water inlet main pipe 201, and enters the second-stage water-cooled wall heat exchanger inlet pipe 202 and the third-stage water-cooled wall heat exchanger inlet pipe 206 respectively, and then enters the second-stage water-cooled wall heat exchanger outer wall 203, the second-stage water-cooled wall heat exchanger inner wall 204 and the third-stage water-cooled wall heat exchanger outer wall 207, the third-stage water-cooled wall heat exchanger inner wall 208 respectively. The circulating cooling water that has been fully heat exchanged with the semi-coke is then collected by the second-stage water-cooled wall heat exchanger outlet pipe 205 and the third-stage water-cooled wall heat exchanger outlet pipe 209, and returns to the cooling tower through the cooling water outlet main pipe 210. The temperature of the circulating cooling water after heat exchange is 45°C.

[0050] In this embodiment, the length of the two-stage water-cooled wall heat exchanger 5 and the three-stage water-cooled wall heat exchanger 7 are both 4200 mm, and the width is both 520 mm. The height of the two-stage water-cooled wall heat exchanger 5 and the three-stage water-cooled wall heat exchanger 7 are both 2500 mm. The two-stage water-cooled wall heat exchanger inner wall 204 and the three-stage water-cooled wall heat exchanger inner wall 208 are respectively arranged in the two-stage water-cooled wall heat exchanger 5 and the three-stage water-cooled wall heat exchanger 7 at intervals of 450 mm.

[0051] In this embodiment, the high-temperature semi-coke temperature at the coke discharge port at the bottom of the vertical furnace is 620°C. Due to the poor thermal conductivity of the semi-coke, the temperature of the semi-coke after cooling through the first-stage steam generator 1 is controlled at: the semi-coke temperature at the side wall of the first-stage semi-coke discharge channel is 130°C, and the semi-coke temperature at the center of the first-stage semi-coke discharge channel is 620°C.

[0052] After the semi-coke is pushed by the first coke pusher 3, it is partially mixed and enters the second water-cooled wall heat exchanger 5 for further cooling and heat exchange. The first steam generator inner wall 104 of the first steam generator 1 and the second water-cooled wall heat exchanger inner wall 204 of the second water-cooled wall heat exchanger 5 are arranged in a staggered manner, so that the semi-coke at the side wall of the first semi-coke feeding channel and the semi-coke at the center are interchanged after entering the second water-cooled wall heat exchanger 5, ensuring that the semi-coke with a relatively high temperature after primary cooling can be more fully cooled after entering the second water-cooled wall heat exchanger 5, thereby improving the uniformity of semi-coke cooling.

[0053] In this embodiment, the temperature of the semicoke after being cooled by the two-stage water-cooled wall heat exchanger 5 is controlled as follows: the temperature of the semicoke at the side wall of the two-stage semicoke feeding channel is 130 °C, and the temperature of the semicoke at the center of the two-stage semicoke feeding channel is 200 °C. The average temperature of the semicoke at the outlet of the two-stage water-cooled wall heat exchanger 5 is controlled at 180 °C.

[0054] After passing through the two-stage water-cooled wall heat exchanger 5, the semicoke enters the coke discharging distributor 6. The coke discharging distributor 6 is provided with a distributing and adjusting plate 302, which evenly distributes the semicoke to the outlets of the 2 coke discharging distributors 6, and realizes the position transposition of the semicoke at the side wall and the center of the semicoke feeding channel again. Humidifying nozzles 301 are respectively arranged at the centers of the coke discharging distributors 6, and the semicoke is supplemented and humidified by spraying water and gasifying in the empty spaces. The coke discharging distributor 6 is made of high-temperature resistant material.

[0055] In this embodiment, the temperature of the semicoke after entering the three-stage water-cooled wall heat exchanger 7 is controlled as follows: the temperature of the semicoke at the side wall of the three-stage semicoke feeding channel is 65 °C, and the temperature of the semicoke at the center of the three-stage semicoke feeding channel is 125 °C. The average temperature of the semicoke at the outlet of the three-stage water-cooled wall heat exchanger 7 is controlled at 80 °C.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A multi-stage semi-coke deep cooling coke discharging system, characterized in that, It includes a first-stage semicoke cooling and discharging device, a second-stage semicoke cooling device, a coke discharging distributor, a third-stage semicoke cooling and discharging device, a quenching tank and a scraper conveyor; the first-stage semicoke cooling and discharging device, the second-stage semicoke cooling device, the third-stage semicoke cooling and discharging device and the quenching tank are successively arranged from top to bottom at the bottom of the vertical furnace; a plurality of coke discharging ports arranged in a straight line are provided at the bottom of the vertical furnace; the first-stage semicoke cooling and discharging device is composed of a plurality of first-stage steam generators and a first-stage semicoke discharging mechanism; the second-stage semicoke cooling device is composed of a plurality of second-stage water-cooled wall heat exchangers; a humidity adjusting nozzle is arranged in the coke discharging distributor; the third-stage semicoke cooling and discharging device is composed of a plurality of third-stage water-cooled wall heat exchangers and a third-stage semicoke discharging mechanism; the semicoke inlet 1 at the top of the first-stage steam generator is arranged in one-to-one correspondence with the coke discharging port at the bottom of the vertical furnace, and the semicoke outlet 1 at the bottom of the first-stage steam generator is connected to the semicoke inlet 2 at the top of the corresponding second-stage water-cooled wall heat exchanger through the first-stage semicoke discharging mechanism, and the semicoke outlet 1 and the semicoke inlet 2 are arranged in a staggered manner; the semicoke outlet 2 at the bottom of the second-stage water-cooled wall heat exchanger is connected to the semicoke inlet 3 at the top of the corresponding third-stage water-cooled wall heat exchanger through the coke discharging distributor, and the semicoke outlet 2 and the semicoke inlet 3 are arranged in a staggered manner; the semicoke outlet 3 at the bottom of the third-stage water-cooled wall heat exchanger is connected to the semicoke inlet at the top of the quenching tank through the third-stage semicoke discharging mechanism, and a scraper conveyor is arranged at the bottom of the quenching tank.

2. The multi-stage semi-coke deep cooling coke discharging system according to claim 1, characterized in that, The first-stage steam generator is fixed on the bottom girder of the vertical furnace; the first-stage semicoke discharging mechanism is composed of a first-stage sealed box, a first-stage coke supporting plate and a first-stage coke pusher; the first-stage sealed box is arranged between the first-stage steam generator and the second-stage water-cooled wall heat exchanger; the semicoke outlet 1 of the first-stage steam generator is communicated with the top opening of the corresponding first-stage sealed box through a high-temperature expansion joint, and the bottom opening of the first-stage sealed box is communicated with the semicoke inlet 2 of the corresponding second-stage water-cooled wall heat exchanger; the first-stage coke pusher is composed of a first-stage coke pushing plate, a first-stage coke pushing rod and a first-stage coke pushing driving device, the first-stage coke supporting plate and the first-stage coke pushing plate are both arranged in the first-stage sealed box, the first-stage coke supporting plate is arranged directly below the semicoke outlet 1 in one-to-one correspondence, the first-stage coke pushing plate and the first-stage coke supporting plate are arranged above the side of the first-stage coke supporting plate in one-to-one correspondence, a plurality of first-stage coke pushing plates are connected by the first-stage coke pushing rod, and one end of the first-stage coke pushing rod passes through the first-stage sealed box and is connected to the first-stage coke pushing driving device.

3. A multi-stage semi-coke deep cooling coke discharging system according to claim 1, characterized in that, The coke discharging distributor is composed of a plurality of V-shaped coke discharging channels, 2 semicoke inlets are arranged at the top of each V-shaped coke discharging channel and are respectively communicated with the corresponding 1 semicoke outlet 2, and 1 semicoke outlet is arranged at the bottom of each V-shaped coke discharging channel and is communicated with the corresponding 1 semicoke inlet 3; a humidity adjusting nozzle is arranged at the center of each V-shaped coke discharging channel at the top of the channel; a material distribution adjusting plate is arranged between two adjacent V-shaped coke discharging channels.

4. A multi-stage semi-coke deep cooling coke discharging system according to claim 1, characterized in that, The three-stage semicoke discharging mechanism consists of a three-stage sealed box body, three-stage coking trays and a three-stage coke pusher; the three-stage sealed box body is arranged between the three-stage water-cooled wall heat exchanger and the quenching trough; the semicoke outlet three of the three-stage water-cooled wall heat exchanger is communicated with the top opening of the corresponding three-stage sealed box body through a medium-temperature expansion joint, and the bottom opening of the three-stage sealed box body is communicated with the top semicoke inlet of the corresponding quenching trough; the three-stage coke pusher consists of three-stage coke pushing plates, three-stage coke pushing rods and three-stage coke pushing driving devices. The three-stage coking trays and the three-stage coke pushing plates are arranged in the three-stage sealed box body. The three-stage coking trays are arranged directly below the semicoke outlet three in one-to-one correspondence. The three-stage coke pushing plates and the three-stage coking trays are arranged above the sides of the three-stage coking trays in one-to-one correspondence. A plurality of three-stage coke pushing plates are connected by three-stage coke pushing rods. One end of the three-stage coke pushing rod passes through the three-stage sealed box body and is connected with the three-stage coke pushing driving device.

5. The multi-stage semi-coke deep cooling coke discharging system according to claim 1, wherein The first-stage steam generator consists of a steam drum, a circulation inlet main pipe, a first-stage steam generator inlet pipe, a first-stage steam generator outer wall, a first-stage steam generator inner wall, a first-stage steam generator outlet pipe, and a circulation outlet main pipe; the first-stage steam generator outer wall and the first-stage steam generator inner wall are both composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the first-stage steam generator into multiple first-stage semicoke feeding channels; the bottom circulating water inlets of the first-stage steam generator outer wall and the first-stage steam generator inner wall are respectively connected to the circulating water outlet of the steam drum through the first-stage steam generator inlet pipe and the circulation inlet main pipe; the top circulating water outlets of the first-stage steam generator outer wall and the first-stage steam generator inner wall are respectively connected to the circulating water inlet of the steam drum through the first-stage steam generator outlet pipe and the circulation outlet main pipe.

6. A multi-stage semi-coke deep cooling coke discharging system according to claim 1, characterized in that, The length of the first-stage steam generator is 3200 - 4200 mm, the width is 420 - 720 mm, and the height is 1800 - 2500 mm; the first-stage steam generator inner wall is arranged at intervals of 250 - 700 mm along the longitudinal direction of the first-stage steam generator.

7. A multi-stage semi-coke deep cooling coke discharging system according to claim 1, characterized in that, The two-stage water-cooled wall heat exchanger is composed of an inlet pipe of the two-stage water-cooled wall heat exchanger, an outer wall of the two-stage water-cooled wall heat exchanger, an inner wall of the two-stage water-cooled wall heat exchanger, and an outlet pipe of the two-stage water-cooled wall heat exchanger; the three-stage water-cooled wall heat exchanger is composed of an inlet pipe of the three-stage water-cooled wall heat exchanger, an outer wall of the three-stage water-cooled wall heat exchanger, an inner wall of the three-stage water-cooled wall heat exchanger, and an outlet pipe of the three-stage water-cooled wall heat exchanger; both the outer wall and the inner wall of the two-stage water-cooled wall heat exchanger are composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the two-stage water-cooled wall heat exchanger into multiple two-stage semicoke feeding channels; both the outer wall and the inner wall of the three-stage water-cooled wall heat exchanger are composed of multiple vertically arranged seamless steel pipes, dividing the internal space of the three-stage water-cooled wall heat exchanger into multiple three-stage semicoke feeding channels; the bottom cooling water inlets of the outer wall and the inner wall of the two-stage water-cooled wall heat exchanger are respectively connected to the total cooling water inlet through the inlet pipe of the two-stage water-cooled wall heat exchanger, and the bottom cooling water inlets of the outer wall and the inner wall of the three-stage water-cooled wall heat exchanger are respectively connected to the total cooling water inlet through the inlet pipe of the three-stage water-cooled wall heat exchanger, and the total cooling water inlet is additionally connected to the circulating water outlet of the cooling tower; the top cooling water inlets of the outer wall and the inner wall of the two-stage water-cooled wall heat exchanger are respectively connected to the total cooling water outlet through the outlet pipe of the two-stage water-cooled wall heat exchanger, and the top cooling water inlets of the outer wall and the inner wall of the three-stage water-cooled wall heat exchanger are respectively connected to the total cooling water outlet through the outlet pipe of the three-stage water-cooled wall heat exchanger, and the total cooling water outlet is additionally connected to the circulating water inlet of the cooling tower.

8. A multi-stage semi-coke deep cooling coke discharging system according to claim 1, characterized in that, The lengths of both the two-stage water-cooled wall heat exchanger and the three-stage water-cooled wall heat exchanger are 3600 - 4800 mm, the widths are both 200 - 620 mm, and the heights are both 1500 - 3000 mm; the inner wall of the two-stage water-cooled wall heat exchanger is arranged at intervals of 200 - 600 mm along the longitudinal direction of the two-stage water-cooled wall heat exchanger; the inner wall of the three-stage water-cooled wall heat exchanger is arranged at intervals of 200 - 600 mm along the longitudinal direction of the three-stage water-cooled wall heat exchanger.

9. A multi-stage semi-coke deep cooling and coke discharging method based on the multi-stage semi-coke deep cooling and coke discharging system according to any one of claims 1 to 8, characterized in that, It includes the following steps: 1) The semicoke with a temperature of 620 - 670 °C after being carbonized and matured in the vertical furnace is discharged into the first-stage steam generator through the coke discharging port at the bottom of the vertical furnace for primary cooling; in the first-stage steam generator, the circulating water with a temperature of 180 - 250 °C led out from the steam drum enters the inlet pipe of the first-stage steam generator through the total circulating inlet pipe, exchanges heat with the semicoke through the outer wall and the inner wall of the first-stage steam generator, and the generated steam returns to the steam drum through the total circulating outlet pipe to recover the waste heat of the high-temperature semicoke; the semicoke after primary cooling falls onto the first-stage coke supporting plate, and the coke discharging speed and the temperature of the semicoke after primary cooling are controlled by the first-stage coke pusher; the temperature of the semicoke at the side wall of the first-stage semicoke feeding channel is controlled at 100 - 150 °C, and the temperature of the semicoke at the center of the first-stage semicoke feeding channel is controlled at 600 - 650 °C; 2) The semi-coke is partially homogenized after being pushed by the first-stage coke pusher, and the first-stage coke pusher discharges the semi-coke into the second-stage water-cooled wall heat exchanger for secondary cooling. The first-stage semi-coke feeding channel of the first-stage steam generator and the second-stage semi-coke feeding channel of the second-stage water-cooled wall heat exchanger are arranged in a staggered manner. The semi-coke at the edge position in the first-stage semi-coke feeding channel is located at the center position of the second-stage semi-coke feeding channel after entering the second-stage water-cooled wall heat exchanger, and the semi-coke at the center position in the first-stage semi-coke feeding channel is located at the edge position of the second-stage semi-coke feeding channel after entering the second-stage water-cooled wall heat exchanger. The circulating cooling water at 30°C to 45°C from the cooling water tower is divided into two paths after passing through the cooling water inlet main pipe. One path enters the outer wall and the inner wall of the second-stage water-cooled wall heat exchanger through the second-stage water-cooled wall heat exchanger inlet pipe, and the other path enters the outer wall and the inner wall of the third-stage water-cooled wall heat exchanger through the third-stage water-cooled wall heat exchanger inlet pipe. The cooling water that has fully exchanged heat with the semi-coke is respectively collected through the second-stage water-cooled wall heat exchanger outlet pipe and the third-stage water-cooled wall heat exchanger outlet pipe into the cooling water outlet main pipe and then returned to the cooling water tower. The temperature of the circulated cooling water after heat exchange is controlled at 40°C to 55°C. The temperature of the semi-coke after being cooled by the second-stage water-cooled wall heat exchanger is controlled as follows: the temperature of the semi-coke at the side wall of the second-stage semi-coke feeding channel is 120°C to 180°C, and the temperature of the semi-coke at the center of the second-stage semi-coke feeding channel is 50°C to 200°C. The average temperature of the semi-coke outlet of the second-stage water-cooled wall heat exchanger is controlled at 100°C to 180°C. 3) The semi-coke after secondary cooling enters the third-stage water-cooled wall heat exchanger through the coke discharging distributor for tertiary cooling. A distributing adjusting plate is provided in the coke discharging distributor to evenly distribute the semi-coke discharged from the second-stage water-cooled wall heat exchanger to the outlet of each V-shaped coke discharging channel. Due to the staggered arrangement of the second-stage semi-coke feeding channel and the third-stage semi-coke feeding channel, the semi-coke at the edge position in the third-stage semi-coke feeding channel is located at the center position of the third-stage semi-coke feeding channel after entering the third-stage water-cooled wall heat exchanger, and the semi-coke at the center position in the second-stage semi-coke feeding channel is located at the edge position of the third-stage semi-coke feeding channel after entering the third-stage water-cooled wall heat exchanger. A humidifying spray head is provided at the center of each coke discharging distributor to supplement the humidity of the semi-coke by spraying and gasification. The temperature of the semi-coke after being cooled by the third-stage water-cooled wall heat exchanger is controlled as follows: the temperature of the semi-coke at the side wall of the third-stage semi-coke feeding channel is 50°C to 70°C, and the temperature of the semi-coke at the center of the third-stage semi-coke feeding channel is 70°C to 140°C. The average temperature of the semi-coke outlet of the third-stage water-cooled wall heat exchanger is controlled at 60°C to 80°C. 4) The semi-coke after tertiary cooling falls onto the third-stage coke supporting plate, and the coke discharging speed and the temperature of the semi-coke after tertiary cooling are controlled by the third-stage coke pusher. The third-stage coke pusher discharges the semi-coke into the quenching trough, and the cooled semi-coke is sent to the coke treatment system outside through the scraper conveyor provided at the bottom of the quenching trough.

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