A closed decoking dewatering and transfer system for delayed coking

Abstract

The application discloses a closed decoking and dewatering transfer system for delayed coking, which comprises a flat bottom cover machine, a screening and crushing machine and a hydraulic coke conveying chute which are sequentially and sealingly connected and arranged below a coke tower, a multi-cone parallel dewatering bin, a flat plate type residue discharge valve and a large-inclination closed scraper discharging machine; after coking reaction is completed, coke is cooled and cut, a mixture of petroleum coke and water enters the screening and crushing machine through the flat bottom cover machine, enters the multi-cone parallel dewatering bin through the hydraulic coke conveying chute for dewatering, and then enters the large-inclination closed scraper discharging machine through the flat plate type residue discharge valve, so that the petroleum coke is transferred to a closed storage yard or is transferred into a coke storage and dewatering tank for waiting for loading. The whole system can rapidly and efficiently dewater, separate and transfer the petroleum coke, can realize screening, crushing, dewatering and transfer of the petroleum coke, and can realize high efficiency, standardization and environmental protection of the hydraulic decoking process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum coke delayed coking in the petrochemical industry, in particular to a closed coke removal and dehydration transfer system for petroleum coke delayed coking. BACKGROUND

[0002] Coking is a process of deep thermal cracking, and is the only process that can produce petroleum coke and cannot be replaced by any other process. Especially the special demand for high-quality petroleum coke in some industries makes the coking process occupy an important position in the oil refining industry. Delayed coking technology has strong adaptability to heavy and poor feedstocks such as heavy oil and residual oil, and has the advantages of mature technology and less investment, so the application of delayed coking devices accounts for a large proportion in the current petrochemical industry in China.

[0003] At present, the old devices in the prior art mostly use hydraulic decoking, that is, high-pressure water is used to cut the petroleum coke in the coke drum, and then the coke-water mixture directly flows into the coke pool through the coke channel. The coke continuously accumulates at the coke channel opening, and the grab crane is used to grab and transfer the coke near the coke channel opening to the coke storage area of the coke pool for stacking and water storage, and then the grab crane is used for secondary transfer after dehydration.

[0004] Since most of the coke pools are in the form of open mouth, a large amount of harmful gas will be volatilized from the coke pool during decoking, and the grab crane will leak and scatter materials during coke transfer, which will cause serious pollution around the coke storage pool, and also cause certain pressure on the surrounding environment. Today, with the gradual improvement of environmental protection requirements, how to solve this problem has become a difficult problem that most petrochemical enterprises need to solve.

[0005] In view of the above situation, the dehydration bin scheme has been adopted in the newly built delayed coking devices in China at present. The cylindrical dehydration bin is placed below the coke drum to replace the traditional open-air coke pool, the top of which is communicated with the bottom of the coke drum to realize feeding, and the bottom cone section is provided with a discharge port. For details, see patent CN201710607643.6, but due to the need for static dehydration, the dehydration bin volume generally needs to meet the coke volume in one cycle of the corresponding coke drum, so this system form has high requirements for the space at the bottom of the coke drum. At present, most of the old devices cannot meet the space requirements of this system. In the new project, in order to meet the space requirements of this scheme, the civil design difficulty and construction cost of the reaction device will also increase.

[0006] Therefore, it is necessary to design an automatic system which can meet the transformation of a large number of existing old devices into a fully closed, pollution-free system combining coke removal, dehydration and transfer, and also has certain applicability in the field of new devices. SUMMARY

[0007] The technical purpose of the present application is to provide a delayed coking closed decoking and dewatering transfer system applicable to the reconstruction of old coke tower equipment, wherein the device as a whole is provided with a closed hydraulic coke conveying chute, and a multi-cone parallel dewatering bin, a flat plate type deslagging valve and a large-inclination closed scraper discharging machine are arranged at the original coke pool position, so that the petroleum coke can be quickly and efficiently dewatered, separated and transferred, the whole system can realize the screening, crushing, dewatering and transfer of the petroleum coke, and the high efficiency, standardization and environmental protection of the hydraulic decoking process can be better realized.

[0008] The technical solution adopted by the present application to solve the above technical problems is: a delayed coking closed decoking and dewatering transfer system, comprising a flat plate bottom cover machine, a screening and crushing machine and a hydraulic coke conveying chute which are sequentially and sealingly connected and arranged below a coke tower, the hydraulic coke conveying chute is in a closed structure, comprising a main chute and a hydraulic impact pipe, wherein the main chute is in a vertical or horizontal structure with a transition at the corner, and the hydraulic impact pipe is communicated with the main chute at the corner to realize hydraulic impact boosting of the material conveyed in the main chute, a multi-cone parallel dewatering bin is connected at the conveying end of the hydraulic coke conveying chute, the multi-cone parallel dewatering bin is communicated with the hydraulic coke conveying chute through a feed inlet arranged on the side wall thereof, the multi-cone parallel dewatering bin is in a closed structure, comprising an upper straight cylinder section and a plurality of discharge cones arranged in parallel below the upper straight cylinder section, a discharge outlet is arranged at the bottom of each discharge cone, and a flat plate type deslagging valve is installed at each discharge outlet, the flat plate type deslagging valve is arranged in a vertical and sealing manner between the discharge outlet of the multi-cone parallel dewatering bin and the feed inlet of a large-inclination closed scraper discharging machine, and the material in the multi-cone parallel dewatering bin which has completed dewatering is transferred by the large-inclination closed scraper discharging machine.

[0009] Further, the hydraulic impact pipe and the inclined or horizontal section of the main chute form an included angle of 0-20°.

[0010] Further, the multi-cone parallel dewatering bin is provided with at least one feed inlet on the upper portion of the side wall, and the feed inlet has a one-to-one correspondence with the hydraulic coke conveying chute, and the hydraulic coke conveying chute and the coke tower connected therewith also have a one-to-one correspondence.

[0011] Further, the multi-cone parallel dewatering bin is arranged on one side of the coke tower through a fixed support.

[0012] Further, the multi-cone parallel dewatering bin comprises a top cover, an upper straight cylinder section and a lower cone section, a water inlet and a tail gas collecting port are formed in the top cover, the tail gas collecting port is connected with a tail gas treatment device, and the lower cone section is composed of a plurality of parallel arranged discharge cones.

[0013] Further, the cross section of the upper straight cylinder section of the multi-cone parallel dehydration bin is in any one of a circle, a rectangle and a polygon, overflow ports are arranged on the side wall of the upper straight cylinder section, and a material uniform distribution mechanism is horizontally arranged in the interior of the upper straight cylinder section.

[0014] Further, a filter water assembly is arranged in each discharge cone of the lower cone section of the multi-cone parallel dehydration bin, and a drainage pipeline is arranged outside the discharge cone.

[0015] Further, the flat plate type slag discharge valve comprises a valve body, an upper flange, a lower flange and an opening degree adjusting assembly arranged on the valve body, the flat plate type slag discharge valve is connected with the discharge port of the multi-cone parallel dehydration bin through the upper flange, is connected with the feeding port of the large-inclination closed scraper discharging machine through the lower flange, and an actuating mechanism is arranged in the opening degree adjusting assembly, the actuating mechanism is at least one of a pneumatic device, an electric device and a hydraulic device.

[0016] Further, the large-inclination closed scraper discharging machine is composed of a horizontal section, a curved section and an inclined section which are arranged in left and right abutment, the horizontal section is arranged directly below the multi-cone parallel dehydration bin, at least one feeding port is arranged at the top of the horizontal section, and the inclination angle of the inclined section is 0-90°.

[0017] Further, the conveying end of the large-inclination closed scraper discharging machine is connected with a closed stock yard or is connected with a coke storage dehydration tank through subsequent conveying equipment.

[0018] The beneficial effects of the present application are as follows:

[0019] 1. The closed coke removal and dehydration transfer system for delayed coking has simple structure and reasonable design, the original open coke chute is transformed into a closed hydraulic coke conveying chute, the multi-cone parallel dehydration bin, the flat plate type slag discharge valve and the large-inclination closed scraper discharging machine are arranged at the position of the original coke pool, the petroleum coke is transferred to a closed stock yard or is transferred into a coke storage dehydration tank for waiting for loading. The whole system realizes the functions of screening, crushing, dehydration and transfer, and a tail gas collecting interface is reserved at the multi-cone parallel dehydration bin for subsequent treatment. The system can transform the existing old open grab type coke removal and transfer into a fully closed, pollution-free, automatic multi-in-one type of coke removal, dehydration and transfer, the transformation cost is low, and the safety and environmental protection are good.

[0020] 2. The closed decoking and dewatering transfer system for delayed coking, wherein the material cut by hydraulic cutting in the coke drum enters the hydraulic coke conveying chute after the flat bottom cover machine and the screening crusher, the water and coke material is flushed into the multi-cone parallel dewatering bin by hydraulic action for dewatering, and then the transfer and conveying are completed by the flat plate type slag discharge valve and the large inclination closed scraper discharge machine, the whole dewatering, conveying and transfer process is in a closed environment, there is no harmful gas leakage and no material spilling during the transfer and conveying process, and it is efficient and environmentally friendly.

[0021] 3. The hydraulic coke conveying chute in the closed decoking and dewatering transfer system for delayed coking, which utilizes hydraulic impact for conveying petroleum coke in the chute, so that the coke chute can even be horizontally arranged, and the fully closed tubular structure realizes complete sealing of the whole process, which is safe and pollution-free.

[0022] 4. The closed decoking and dewatering transfer system for delayed coking, wherein due to the use of the hydraulic coke conveying chute, the multi-cone parallel dewatering bin can be arranged in the coke pool of the old device, which is not limited by the space at the bottom of the coke drum, greatly improves the adaptability of the closed modification of the old device, and reduces the civil design difficulty and investment cost of the coke drum in the new project.

[0023] 5. The closed decoking and dewatering transfer system for delayed coking, wherein the lower part of the multi-cone parallel dewatering bin adopts a plurality of cone structures in parallel, which are connected internally, thereby increasing the number of discharge ports, improving the coke conveying efficiency, effectively reducing the overall height of the dewatering bin, effectively increasing the volume of the dewatering bin, and increasing the internal filter area due to the increase of the area of the cone at the bottom of the bin, thereby further improving the dewatering capacity.

[0024] 6. The closed decoking and dewatering transfer system for delayed coking, wherein the material uniform distribution mechanism is further arranged in the straight cylinder section at the upper part of the multi-cone parallel dewatering bin, which can realize uniform distribution of coke in the multi-cone parallel dewatering bin, reduce the conical accumulation of coke in the bin due to the angle of repose of the coke, thereby increasing the effective utilization rate of the dewatering bin, and further reducing the overall height of the dewatering bin.

[0025] 7. The closed decoking and dewatering transfer system for delayed coking, wherein the application of the flat plate type slag discharge valve at the bottom of the multi-cone parallel dewatering bin can adjust the opening of the valve to control the discharge amount of the single valve, and multiple valves can be linked, which realizes the control of the material conveying speed and the no-load starting of the large inclination closed scraper discharge machine.

[0026] 8. The closed decoking and dewatering transfer system for delayed coking, a plurality of feeding inlets are arranged on the top of the large-inclination closed scraper discharging machine, which is used in cooperation with the flat plate type slag discharge valve, so as to ensure the effective utilization of the internal space of the multi-cone parallel dewatering bin, and the dead material accumulation does not appear in the internal space, and the output capacity of the discharging machine is reasonably utilized.

[0027] 9. The closed decoking and dewatering transfer system for delayed coking, which not only realizes the whole-process closed decoking and dewatering transfer of the petroleum coke delayed coking device, but also realizes the closed collection of tail gas, and more importantly, meets the requirement of transforming the existing large number of old devices into a full-closed and pollution-free device combined with decoking, dewatering and transfer, and also has a certain application in the field of new device automatic decoking system. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of the present application;

[0029] Figure 2 is a structural schematic top view of the present application;

[0030] Figure 3 is a structural schematic diagram of example 1 in the present application;

[0031] Figure 4 is a structural schematic diagram of example 2 in the present application;

[0032] The drawings show that: 1, coke tower, 2, flat plate bottom cover machine, 3, screening crusher, 4, water power conveying coke, 401, water power impact pipe, 402, main sliding pipe, 5, multi-cone parallel dewatering bin, 501, top cover, 502, upper straight cylinder section, 503, discharging cone, 504, fixed support, 6, flat plate type slag discharge valve, 7, large-inclination closed scraper discharging machine, 8, coke pool, 9, closed storage yard, 10, transfer conveyor I, 11, transfer conveyor II, 12, transfer conveyor III, 13, discharger, 14, transfer conveyor IV, 15, coke storage and dewatering tank, 16, loading conveyor, 17, crane grab. DETAILED DESCRIPTION

[0033] The specific embodiment of the present application will be described below in conjunction with the drawings:

[0034] As shown in the figure, the sealed decoking and dewatering transfer system for delayed coking includes a flat bottom cover machine 2, a screening crusher 3, a hydraulic coke conveying chute 4, a multi-cone parallel dewatering bin 5, a flat plate type deslagging valve 6 and a large inclination sealed scraper discharging machine 7, and is mainly applied to the field of delayed coking in the petroleum and chemical industry. The flat bottom cover machine 2 is arranged at the bottom of the coke drum 1, the screening crusher 3 is arranged below the flat bottom cover machine 2, the inclined hydraulic coke conveying chute 4 is arranged below the screening crusher 3, the hydraulic coke conveying chute 4 is communicated with the side wall of the multi-cone parallel dewatering bin 5, a plurality of discharging ports are arranged at the bottom of the multi-cone parallel dewatering bin 5, the flat plate type deslagging valve 6 is arranged at each discharging port, the feeding port of the large inclination sealed scraper discharging machine 7 arranged at the lower part of the multi-cone parallel dewatering bin 5 is communicated with the plurality of flat plate type deslagging valves 6, and the large inclination sealed scraper discharging machine 7 transfers the coke dewatered in the multi-cone parallel dewatering bin 5.

[0035] The hydraulic coke conveying chute 4 is arranged one-to-one with the coke drum 1, the inlet of the hydraulic coke conveying chute 4 is connected with the upper screening crusher 3, and the discharging port of the hydraulic coke conveying chute 4 is communicated with the multi-cone parallel dewatering bin 5.

[0036] The hydraulic coke conveying chute 4 includes a main chute 402 and a hydraulic impact pipe 401, the main chute 402 is arranged in a vertical-to-inclined or horizontal form as a whole, the corner of the main chute 402 is smoothly transitioned by a large round corner, the hydraulic impact pipe 401 is communicated with the main chute 402, the opening of the hydraulic impact pipe 401 is located at the large round corner transition position, and the hydraulic impact pipe 401 and the inclined / horizontal section of the main chute 402 form an included angle of 0-20°.

[0037] The multi-cone parallel dewatering bin 5 is in a one-to-many relationship with the coke drum 1, that is, one bin is connected with multiple coke drums, is fixed and supported by a fixed support 504, and does not need to be arranged directly below the coke drum 1. For old devices, the multi-cone parallel dewatering bin 5 is mainly arranged in the original coke pool 8. A plurality of discharging ports are arranged at the bottom of the dewatering bin 5, the flat plate type deslagging valve 6 is connected with the discharging ports by a flange connection form, and one or more large inclination sealed scraper discharging machines 7 with multiple feeding ports can be arranged at the lower part according to the number and distribution form of the discharging ports.

[0038] Taking a delayed coking device with two coke drums as an example, one set of multi-cone parallel dewatering bin 5 is arranged for two coke drums 1. According to the needs, twelve outlets, twelve flat plate type deslagging valves 6 and three four-inlet large inclination sealed scraper discharging machines 7 can be arranged at the lower part of the multi-cone parallel dewatering bin 5; or six outlets, six flat plate type deslagging valves 6 and two three-inlet large inclination sealed scraper discharging machines 7 can be arranged at the lower part of the multi-cone parallel dewatering bin 5. The overall configuration number form is flexible. The axis of the large inclination sealed scraper discharging machine 7 is arranged in parallel with the horizontal center line connecting the centers of the two coke drums 1.

[0039] The multi-cone parallel dehydration bin 5 comprises a top cover 501, an upper straight cylinder section 502, and a lower cone section which is composed of a plurality of discharge cones 503 arranged in parallel, and the top cover 501 is provided with a water inlet and a tail gas collecting port. The upper straight cylinder section 502 has a horizontal cross section in the form of a rectangle, a polygon or a circle intersection, and is provided with an overflow port outside. The discharge cone 503 is in the form of a pyramid or a cone, and each cone section is provided with a discharge port, and a filter screen is arranged inside, and a drainage pipeline is connected outside.

[0040] The flat plate type discharge valve 6 has an opening degree which can be adjusted at will, and the valve plate has a dehydration function at the same time, and the opening and closing actuator can adopt any one or a combination form of a pneumatic device, an electric device or a hydraulic device.

[0041] The large-inclination angle closed scraper discharging machine 7 has a conveying inclination angle of 0-90°, and has a whole structure in the form of a scraper conveyor, and a plurality of feeding ports can be arranged.

[0042] The large-inclination angle closed scraper discharging machine 7 can directly transport the petroleum coke to the closed storage yard 9, and the petroleum coke is loaded into a vehicle and transported out through a crane grab or the like, or is transported into a coke storage dehydration tank 15 through subsequent conveying equipment and waits for loading.

[0043] The closed coke removal and dehydration transportation system for delayed coking is particularly used for the transformation of an old device in the form of an open grab transportation, and the transformation includes a flat plate bottom cover machine, a screening crusher, a hydraulic coke conveying pipe, a multi-cone parallel dehydration bin, a flat plate type discharge valve and a large-inclination angle closed scraper discharging machine. After the coking reaction is completed, the petroleum coke and the water mixture are cut into pieces, enter the screening crusher through the flat plate bottom cover machine at the bottom of the coke tower, enter the multi-cone parallel dehydration bin through the hydraulic coke conveying pipe, are dehydrated, and then are transported to a closed storage yard by the large-inclination angle closed scraper discharging machine through the flat plate type discharge valve, or are transported into a coke storage dehydration tank and wait for loading.

[0044] The whole system can also reserve a tail gas collecting interface at the multi-cone parallel dehydration bin to facilitate subsequent treatment, while realizing the functions of screening, crushing, dehydration and transportation. The system can transform the old open grab type coke removal and transportation device into a fully closed, pollution-free, automatic device which integrates coke removal, dehydration and transportation.

[0045] Example 1

[0046] The closed decoking and dewatering transfer system for delayed coking comprises a flat bottom cover machine 2, a screening crusher 3 and a hydraulic coke conveying chute 4 which are sequentially sealed and docked in the bottom of the coke tower 1, the hydraulic coke conveying chute 4 is in a closed structure, comprising a main chute 402 and a hydraulic impact pipe 401, wherein the main chute 402 is vertically and obliquely turned, and the turning corner is smoothly transitioned by a large round corner, the hydraulic impact pipe 401 is communicated with the main chute 402 at the turning corner, and the hydraulic impact pipe 401 is parallel to the inclined or horizontal section of the main chute 402, the hydraulic impact pipe 401 can realize hydraulic impact boosting of the conveyed material in the main chute 402, and a multi-cone parallel dewatering bin 5 is connected to the conveying end of the hydraulic coke conveying chute 4.

[0047] The multi-cone parallel dewatering bin 5 is arranged on one side of the coke tower 1 through a fixed support 504, the multi-cone parallel dewatering bin 5 is in a closed structure, two feed ports are arranged on the upper part of the side wall of the multi-cone parallel dewatering bin 5, and the two feed ports are connected with the two hydraulic coke conveying chutes 4 one by one, the multi-cone parallel dewatering bin 5 is communicated with the hydraulic coke conveying chute 4 through the feed ports arranged on the side wall thereof, and each hydraulic coke conveying chute 4 corresponds to one coke tower 1.

[0048] The multi-cone parallel dewatering bin 5 comprises a top cover 501, an upper straight cylinder section 502 and a lower cone section, the top cover 501 is provided with a water inlet and a tail gas collecting port, and the tail gas collecting port is connected with a tail gas treatment device, the cross section of the upper straight cylinder section 502 is circular, an overflow port is arranged on the side wall of the upper straight cylinder section 502, and a material uniform distribution mechanism is horizontally arranged in the interior of the upper straight cylinder section 502, the lower cone section is composed of six discharge cones 503 which are arranged in parallel below the upper straight cylinder section 502, and a water filtering assembly is arranged in each discharge cone 503 of the lower cone section, and a drain pipe is arranged on the exterior of the discharge cone 503.

[0049] A discharge port is arranged at the bottom of each discharge cone 503, and a flat plate type discharge valve 6 is mounted at each discharge port, the flat plate type discharge valve 6 comprises a valve body, an upper flange, a lower flange and an opening adjusting assembly which are arranged on the valve body, the flat plate type discharge valve 6 is connected with the discharge port of the multi-cone parallel dewatering bin 5 through the upper flange, is connected with the feed port of a large inclination angle closed scraper discharge machine 7 through the lower flange, and an actuator is arranged in the opening adjusting assembly, and the actuator is a pneumatic device.

[0050] The material which has completed dewatering in the multi-cone parallel dewatering bin 5 is transferred by the large inclination angle closed scraper discharge machine 7, the large inclination angle closed scraper discharge machine 7 is composed of a horizontal section, a curved section and an inclined section which are docked left and right, the horizontal section is arranged directly below the multi-cone parallel dewatering bin 5, and a plurality of feed ports are arranged on the top of the horizontal section, the inclination angle of the inclined section is 45°, and the conveying end of the large inclination angle closed scraper discharge machine 7 is connected with a closed storage yard 9.

[0051] The delayed coking closed decoking and dewatering transfer system of the embodiment is used for transferring petroleum coke after the coking reaction is completed, the petroleum coke is cooled and cut, and the mixture of petroleum coke and water is fed into the screening crusher 3 through the flat bottom cover machine 2 at the bottom of the coke tower 1 after screening and crushing, and then fed into the main chute 402 of the hydraulic coke chute 4. Through the hydraulic impact of the hydraulic impact pipe 401, the petroleum coke is fed into the multi-cone parallel dewatering bin 5 along the inclined section of the main chute 402. The top cover 501 of the multi-cone parallel dewatering bin 5 is provided with a water inlet, a tail gas collection port and the like. After dewatering, the petroleum coke is fed out of the discharge port of the discharge cone 503, fed into the inlet of the large-inclination closed scraper discharge machine 7 arranged at the lower part of the multi-cone parallel dewatering bin 5 through the flat plate type discharge valve 6, and transferred by the large-inclination closed scraper discharge machine 7.

[0052] The specific operation process is as follows: before the hydraulic cutting of coke, the drainage pipeline on the multi-cone parallel dewatering bin 5 and the outlet on the valve plate of the flat plate type discharge valve 6 should be closed. Then a certain amount of water is added from the top water inlet into the multi-cone parallel dewatering bin 5 to play a buffering role. After the cutting of coke starts, the coke-water mixture enters the multi-cone parallel dewatering bin 5 through gravity and hydraulic impact. During the whole process, the excess water is discharged outside the bin body through the overflow port, and the tail gas generated is discharged into the tail gas treatment device through the top tail gas collection port. After the cutting of coke is completed, the drainage pipeline of the multi-cone parallel dewatering bin 5 and the drainage port on the valve plate of the flat plate type discharge valve 6 are opened, and the discharged water will enter the recycling process for treatment and reuse. After dewatering is completed, the large-inclination closed scraper discharge machine 7 is started first, and then the flat plate type gate valve 6 connected with the large-inclination closed scraper discharge machine 7 is opened one by one, so that the material enters the large-inclination closed scraper discharge machine 7 to start the transfer.

[0053] The subsequent transfer mode of the large-inclination closed scraper discharge machine 7 in the embodiment is as follows:

[0054] The large-inclination closed scraper discharge machine 7 directly transfers the petroleum coke to the closed storage yard 9, and then the petroleum coke is transferred by the crane grab 17 or the engineering machinery such as the loader, as shown in the specific schematic view of the subsequent transfer mode of the large-inclination closed scraper discharge machine 7. Figure 3

[0055] Embodiment 2

[0056] ​The closed decoking and dehydration transfer system for delayed coking comprises a flat bottom cover machine 2, a screening crusher 3 and a hydraulic coke conveying chute 4 which are sequentially and sealingly connected in a bottom-to-top mode below a coke tower 1.

[0057] The multi-cone parallel dehydration bin 5 is arranged on one side of the coke tower 1 through a fixing support 504, and the multi-cone parallel dehydration bin 5 has a closed structure. Three feed inlets are arranged on the upper portion of the sidewall of the multi-cone parallel dehydration bin 5, and the three feed inlets are connected with the three hydraulic coke conveying chutes 4 in a one-to-one mode. The multi-cone parallel dehydration bin 5 is connected with the hydraulic coke conveying chutes 4 through the feed inlets arranged on the sidewall thereof, and each hydraulic coke conveying chute 4 corresponds to one coke tower 1.

[0058] The multi-cone parallel dehydration bin 5 comprises a top cover 501, an upper straight cylinder section 502 and a lower cone section. The top cover 501 is provided with a water inlet and a tail gas collecting port, and the tail gas collecting port is connected with a tail gas treatment device. The upper straight cylinder section 502 has a polygonal cross section, and is provided with an overflow port on the sidewall thereof. A material uniform distribution mechanism is horizontally arranged in the interior of the upper straight cylinder section 502. The lower cone section is composed of eight discharge cones 503 which are arranged in parallel below the upper straight cylinder section 502. A water filtering assembly is arranged in each discharge cone 503 of the lower cone section, and a drain pipe is arranged outside the discharge cone 503.

[0059] A discharge outlet is arranged at the bottom of each discharge cone 503, and a flat plate type discharge valve 6 is mounted at each discharge outlet. The flat plate type discharge valve 6 comprises a valve body, an upper flange, a lower flange and an opening adjusting assembly which are arranged on the valve body. The flat plate type discharge valve 6 is connected with the discharge outlet of the multi-cone parallel dehydration bin 5 through the upper flange, and is connected with the feed inlet of a large-inclination closed scraper discharge machine 7 through the lower flange. An actuator is arranged in the opening adjusting assembly, and the actuator is an electric device.

[0060] The dewatered material in the multi-cone parallel dewatering bin 5 is transferred by the large-angle closed scraper discharging machine 7, which is composed of horizontally, curved and inclined sections arranged in left and right abutment. The horizontal section is arranged directly below the multi-cone parallel dewatering bin 5, and the top of the horizontal section is provided with a plurality of feeding ports. The inclined angle of the inclined section is 45°. The conveying end of the large-angle closed scraper discharging machine 7 is connected with the coke storage and dewatering tank 15 via subsequent conveying equipment.

[0061] The closed coke removal and dewatering transfer system for delayed coking in the embodiment is as follows. After the completion of coking reaction and the process of cold coke and coke cutting, the mixture of petroleum coke and water is fed into the screening and crushing machine 3 from the flat bottom cover machine 2 through the bottom of the coke tower 1, and then into the main chute 402 of the hydraulic coke conveying chute 4 after screening and crushing. The mixture is fed into the multi-cone parallel dewatering bin 5 along the inclined section of the main chute 402 through the hydraulic impact of the hydraulic impact pipe 401. The top cover 501 of the multi-cone parallel dewatering bin 5 is provided with a water inlet and a tail gas collection port. After dewatering, the petroleum coke is fed into the feeding port of the large-angle closed scraper discharging machine 7 arranged below the multi-cone parallel dewatering bin 5 from the discharging port of the discharging cone 503 via the flat plate type discharging valve 6, and then transferred by the large-angle closed scraper discharging machine 7.

[0062] The specific operation process is as follows. Before the start of the hydraulic coke cutting, the drainage pipeline on the multi-cone parallel dewatering bin 5 and the outlet on the valve plate of the flat plate type discharging valve 6 should be closed. Then a certain amount of water is added from the top water inlet into the multi-cone parallel dewatering bin 5 to play a buffering role. After the start of the coke cutting, the coke-water mixture is fed into the multi-cone parallel dewatering bin 5 through gravity and hydraulic impact. During the whole process, the excess water is discharged outside the bin body through the overflow port, and the generated tail gas is discharged into the tail gas treatment device through the top tail gas collection port. After the completion of the coke cutting operation, the drainage pipeline of the multi-cone parallel dewatering bin 5 and the drainage port on the valve plate of the flat plate type discharging valve 6 are opened, and the discharged water will enter the recycling process for treatment and reuse. After the completion of dewatering, the large-angle closed scraper discharging machine 7 is started first, and then the flat plate type gate valve 6 connected with the large-angle closed scraper discharging machine 7 is opened one by one, and the material is transferred into the large-angle closed scraper discharging machine 7 to start the transfer.

[0063] The subsequent transfer mode of the large-angle closed scraper discharging machine 7 in the embodiment is as follows.

[0064] The large-angle closed scraper discharging machine 7 is connected with the subsequent belt conveyor or other forms of conveying machinery, which specifically includes transfer conveyors I 10, transfer conveyors II 11, transfer conveyors III 12 and transfer conveyors IV. The petroleum coke is transferred to the coke storage and dewatering tank 15 through the unloader 13, and then is loaded into a vehicle and transported out through the vehicle loading conveyor 16 arranged below the tank, as shown in the accompanying drawings. Figure 4 The subsequent transfer mode of the large-angle closed scraper discharging machine 7 in the embodiment is as follows.

Claims

1. A closed decoking dewatering and transfer system for delayed coking, comprising a flat bottom cover machine (2), a screening crusher (3) and a hydraulic coke conveying chute (4) which are sequentially sealed and docked in upper and lower positions below a coke tower (1), characterized in that: The hydraulic coke conveying chute (4) is in a closed structure, comprising a main chute (402) and a hydraulic impact chute (401), wherein the main chute (402) is in a vertical or horizontal structure with a transition at the corner, and the hydraulic impact chute (401) is communicated with the main chute (402) at the corner and forms an angle of 0-20° with the inclined or horizontal section of the main chute (402) to realize hydraulic impact boosting of the material conveyed in the main chute (402), and a multi-cone parallel dehydration bin (5) is connected to the conveying end of the hydraulic coke conveying chute (4), the multi-cone parallel dehydration bin (5) is communicated with the hydraulic coke conveying chute (4) through the feed inlet arranged on the side wall, and the coke material is impacted into the multi-cone parallel dehydration bin by hydraulic action for dehydration; one multi-cone parallel dehydration bin (5) corresponds to multiple coke towers (1), the hydraulic coke conveying chute (4) corresponds to the coke tower (1) connected thereto one by one, and the feed inlet of the side wall of the multi-cone parallel dehydration bin corresponds to the hydraulic coke conveying chute (4) one by one. The multi-cone parallel dehydration bin (5) is in a closed structure, comprising a top cover (501), an upper straight cylinder section (502) and a lower cone section, and the lower cone section is composed of multiple parallel discharge cones (503) arranged below the upper straight cylinder section (502); a water filtering assembly is arranged in each discharge cone (503), and a drain pipe is arranged outside the discharge cone (503). A material uniform distribution mechanism for realizing uniform distribution of coke in the multi-cone parallel dehydration bin is horizontally arranged in the inside of the upper straight cylinder section (502), and a water inlet for injecting water into the multi-cone parallel dehydration bin before hydraulic coke cutting to play a buffering role is formed in the top cover (501). A discharge outlet is arranged at the bottom of each discharge cone (503), and a flat plate type slag discharge valve (6) is installed at each discharge outlet, the flat plate type slag discharge valve (6) is arranged in butt joint between the discharge outlet of the multi-cone parallel dehydration bin (5) and the feed inlet of the large-inclination closed scraper discharge machine (7), and the material in the multi-cone parallel dehydration bin (5) after dehydration is transferred by the large-inclination closed scraper discharge machine (7). The large-inclination closed scraper discharge machine (7) is composed of a horizontal section, a curved section and an inclined section arranged in butt joint, and the horizontal section is arranged directly below the multi-cone parallel dehydration bin (5).

2. The closed decoking dewatering transfer system for delayed coking according to claim 1, characterized in that: The multi-cone parallel dehydration bin (5) is arranged on one side of the coke tower (1) through a fixing support (504).

3. The closed decoking dewatering transfer system for delayed coking according to claim 1, characterized in that: A tail gas collecting port is formed in the top cover (501) and connected with a tail gas treatment device.

4. The closed decoking dewatering transfer system for delayed coking according to claim 3, characterized in that: The cross section of the upper straight cylinder section (502) of the multi-cone parallel dehydration bin (5) is circular or polygonal, and an overflow port is arranged on the side wall of the upper straight cylinder section (502).

5. The closed decoking dewatering transfer system for delayed coking according to claim 3, characterized in that: The cross section of the upper straight cylinder section (502) of the multi-cone parallel dehydration bin (5) is rectangular, and an overflow port is arranged on the side wall of the upper straight cylinder section (502).

6. The closed decoking dewatering transfer system for delayed coking according to claim 1, characterized in that: The flat plate type slag discharge valve (6) comprises a valve body, an upper flange, a lower flange and an opening degree adjusting assembly arranged on the valve body, the flat plate type slag discharge valve (6) is connected with a discharge port of the multi-cone parallel dehydration bin (5) through the upper flange, is connected with a feeding port of the large-inclination closed scraper discharge machine (7) through the lower flange, and an executing mechanism is arranged in the opening degree adjusting assembly, the executing mechanism is at least one of a pneumatic device, an electric device and a hydraulic device.

7. The closed decoking dewatering transfer system for delayed coking according to claim 1, wherein: The conveying end of the large-inclination closed scraper discharge machine (7) is connected with a closed stockyard (9) or is connected with a coke storage dehydration tank (15) through subsequent conveying equipment.

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