Delayed coking decoking device

Abstract

The application discloses a delayed coking closed decoking device, which comprises a multi-outlet dehydration bin and an L-shaped dehydration conveyor, the L-shaped dehydration conveyor is a closed conveying structure provided with a material outlet only at the conveying end, the multi-outlet dehydration bin comprises a top cover, an upper straight cylinder section and a lower conical section, the lower conical section is composed of a plurality of discharge cones, the discharge cones are jointly connected below the upper straight cylinder section, a discharge outlet is arranged at the bottom of each discharge cone, and a flat plate type slag discharge valve is arranged at each discharge outlet and is connected between the discharge outlet of the multi-outlet dehydration bin and the feeding port of the L-shaped dehydration conveyor, so as to realize the conveying of materials in a closed environment. The application can be applied to the delayed coking closed decoking device of the old coke tower equipment, has the dehydration and transfer functions, has good sealing performance, has high separation efficiency, can fully dehydrate the slag during the transfer and transportation, and can realize the high efficiency, standardization and environmental protection of the hydraulic decoking process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of delayed coking devices, in particular to a delayed coking closed decoking device in the oil refining industry. BACKGROUND

[0002] The delayed coking technology is one of the main processing methods for residual oil, especially poor residual oil, due to its strong raw material adaptability, mature technology, and low investment and operation cost. When the coke drum is decoked, the mixture of high-temperature coke and decoking water flows into the open coke pool, and after dehydration in the coke pool, it is transferred by the crane grab or loaded into the car, and the tail gas generated thereby contains harmful substances such as hydrogen sulfide, VOC, and dust. At present, the total processing capacity of domestic delayed coking devices is about 100 million tons, and the annual coke production is several million tons. Delayed coking devices are also seriously concerned due to environmental protection problems.

[0003] At present, a dehydration bin scheme is used in newly built delayed coking devices. The dehydration bin in this scheme is circular, placed below the coke drum, fed from the top, and provided with a conical section and a discharge port at the bottom. Referring to the patent CN201710607643.6, since the volume of the dehydration bin is related to the volume of coke produced per cycle of the coke drum, the dehydration bin of this structure usually requires a high height. Therefore, the existing delayed coking device frame at the bottom cannot accommodate the dehydration bin of this structure, and can only be used for newly built delayed coking devices, and the bottom frame of the coke drum device increases in height compared with the conventional device, which increases the design difficulty and construction cost of the civil engineering. At the same time, since the dehydration bin has only one discharge port, the discharge time will also increase accordingly, reducing the production efficiency.

[0004] In addition, due to the large accumulation of materials in the dehydration bin, when the water content in the dehydration bin decreases to a certain extent, the dehydration efficiency in the later period will be greatly reduced, and it is difficult to separate the remaining water in a short time.

[0005] Therefore, it is necessary to improve the structure of the existing delayed coking closed decoking device to make it have high separation efficiency, good dehydration effect, and be suitable for the closed modification of conventional old equipment, for the high efficiency and environmental protection of hydraulic decoking. SUMMARY

[0006] The technical purpose of the present application is to provide a delayed coking closed decoking device suitable for old coke drum equipment, which has a simple overall structure, is easy to operate, has dehydration and transfer functions, good sealing, high separation efficiency, can fully dehydrate the slag during transfer, and can realize the high efficiency, standardization and environmental protection of the hydraulic decoking process.

[0007] The technical scheme adopted by the present application to solve the above technical problems is: a delayed coking closed decoking device, comprising a multi-outlet dehydration bin arranged below a coke tower and an L-shaped dehydration conveyor, the L-shaped dehydration conveyor is a closed conveying structure with only a material outlet arranged at the conveying end, the multi-outlet dehydration bin comprises a top cover, an upper straight cylinder section and a lower conical section, the top cover is provided with a residue inlet opening connected with a residue outlet of the bottom of the coke tower, the lower conical section is composed of a plurality of discharge cones, the plurality of discharge cones are jointly connected below the upper straight cylinder section, and each discharge cone is provided with a discharge outlet at the bottom, and each discharge outlet is provided with a flat plate type residue discharge valve, the flat plate type residue discharge valve is arranged between the discharge outlet of the multi-outlet dehydration bin and the inlet of the L-shaped dehydration conveyor in a vertically jointed manner, so as to realize the conveying of the material in a closed environment.

[0008] Further, the top cover of the multi-outlet dehydration bin is further provided with a water inlet and an exhaust port, and the exhaust port is connected with a tail gas treatment device; the upper straight cylinder section of the multi-outlet dehydration bin is in any one of a cylindrical shape, a rectangular cylindrical shape or a polygonal cylindrical shape, the side wall of the upper straight cylinder section is provided with an overflow port, and the inside of the upper straight cylinder section is horizontally provided with a material uniform distribution mechanism; each discharge cone of the lower conical section of the multi-outlet dehydration bin is provided with a water filtering assembly, and the water filtering assembly is connected with a drainage pipeline arranged outside the discharge cone.

[0009] Further, the flat plate type residue 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 residue discharge valve is connected with the discharge outlet of the multi-outlet dehydration bin through the upper flange, connected with the inlet of the L-shaped dehydration conveyor through the lower flange, and the opening degree adjusting assembly is provided with an executing mechanism, which is at least one of a pneumatic device, an electric device or a hydraulic device.

[0010] Further, the L-shaped dehydration conveyor comprises a body assembly, a driving assembly, a tail wheel assembly and a chain scraper assembly, wherein the body assembly is in a rectangular groove structure with a closed periphery, wear-resistant lining plates are arranged on the left and right side walls inside the rectangular groove structure body assembly, a partition plate unit is arranged at the middle of the body assembly for separating the internal cavity of the body assembly into two parts of an upper groove body and a lower groove body, the body assembly is composed of a horizontally arranged section, a curved section and an inclined section arranged in a left-right jointed manner, the horizontally arranged section is arranged directly below the multi-outlet dehydration bin, the tail wheel assembly is installed at the end of the horizontally arranged section not connected with the curved section, the curved angle of the curved section is 0-40°, the driving assembly is installed at the end of the inclined section not connected with the curved section, the chain scraper assembly is arranged inside the body assembly and comprises a chain and a plurality of scrapers arranged on the chain in a left-right spaced manner, the chain can make a circumferential reciprocating motion in the upper groove body and the lower groove body under the driving of the driving assembly and the tail wheel assembly, so as to realize the movement of the material on the partition plate unit from the inlet to the material outlet by the scraper.

[0011] Further, the baffle unit comprises a support baffle and a Johnson screen laid along the length direction of the machine body assembly, and the mesh size of the Johnson screen is 2-4 mm.

[0012] Further, the end of the upper trough in the horizontal section is provided with a material blocking baffle for separating the upper trough and the lower trough, the material blocking baffle is vertically arranged, and a gap is reserved between the bottom of the material blocking baffle and the baffle unit, the size of the gap is greater than the height of the scraper, the width of the material blocking baffle is consistent with the width of the upper trough, and the length of the material blocking baffle is greater than the distance between every two adjacent scrapers on the chain.

[0013] Further, the top of the machine body assembly is provided with at least one feeding port, and a material limiting plate for limiting the height of the material carried by the scraper after feeding is arranged at each feeding port, the material limiting plate is inserted into the inner wall surface of the top of the machine body assembly, and the limiting height of the material limiting plate is adjustable.

[0014] Further, the tail wheel assembly comprises a tail shaft and two chain wheels assembled on the tail shaft, one chain is installed on each chain wheel, a rolling bearing is arranged in the inside of each chain wheel, a code disc is also installed on each chain wheel, a proximity switch matched with the code disc is arranged in the machine body assembly, the cooperation of the code disc and the proximity switch can realize rapid discrimination when the chain is broken, and a flushing nozzle for periodically cleaning the chain wheel is arranged above each chain wheel.

[0015] The tail shaft is provided with a support sliding seat at each axial end, the upper and lower ends of the support sliding seat are both provided with a sliding groove, a sliding track matched with the sliding groove is arranged in the machine body assembly, and a long waist hole for the end of the tail shaft to pass through is arranged on the machine body assembly, the sliding of the support sliding seat on the sliding track can drive the synchronous sliding of the tail shaft in the long waist hole, so as to adjust the tension of the chain installed on the chain wheel.

[0016] The L-shaped dehydration conveyor further comprises a sealing assembly for sealing the end of the tail wheel assembly, the sealing assembly comprises a sealing cover fixed on the machine body assembly, the sealing cover is arranged outside the long waist hole, a sealing gasket and a pressing plate are arranged on the outer side wall of the machine body assembly and matched with the outer circumference of the long waist hole, and the pressing plate is compressed by the tapered screws installed on the upper and lower ends of the sealing cover.

[0017] The L-shaped dehydration conveyor further comprises a tensioning assembly, the tensioning assembly comprises a screw rod, a nut, a disc spring, a sealing unit and a support seat, one end of the screw rod is connected to the support sliding seat in the tail wheel assembly, the other end of the screw rod passes through the end plate in the length direction of the machine body assembly and is axially sealed at the passing-out part by the sealing unit, the support seat is arranged outside the sealing unit, the nut is assembled on the screw rod in cooperation, the disc spring is arranged between the end surface of the nut and the support seat, and the adjustment of the tightening degree of the nut on the screw rod can realize the regulation and control of the tensioning degree of the tail wheel assembly.

[0018] Further, the bottom of the lower groove body in the horizontal section is provided with a drainage opening, and a drainage ditch is arranged below the drainage opening, and a water flushing pipeline is arranged in the drainage ditch.

[0019] Further, arc-shaped guide rails are arranged in the upper groove body and the lower groove body of the curved section, and the arc-shaped guide rails are fixed on the inner side wall of the machine body assembly and used for limiting the chain in the chain scraper assembly which makes a circumferential reciprocating motion.

[0020] The beneficial effects of the present application are:

[0021] 1. The delayed coking closed decoking device has simple structure and reasonable design, has dehydration and transfer functions, has good overall sealing, is environmentally friendly, safe and efficient in the whole treatment process, and can replace the traditional open-air dehydration and crane grab transfer treatment mode. Compared with the existing cylindrical single-outlet dehydration bin, the multi-outlet dehydration bin in the device has a lower height, can effectively reduce the device height of the whole coke tower when applied to a newly-built device, and can reduce the civil engineering investment cost. In the modification of an old device, compared with the traditional cylindrical bin body, the existing coke tower frame bottom space can be fully utilized, and the closed modification of most old devices can be adapted. The L-shaped dehydration conveyor in the device can control the material layer thickness, can thin the material accumulated in the dehydration bin in the conveyor, and can separate the residual moisture during the material transfer and movement, so that a lower water content is achieved.

[0022] 2. The delayed coking closed decoking device has good sealing, is environmentally friendly and efficient, saves the equipment of the intermediate transfer link, avoids the loss of the material in the process, and can replace the traditional decoking mode of the coke pool plus the crane grab.

[0023] 3. The delayed coking closed decoking device has four conical structures at the lower part of the multi-outlet dehydration bin, which increases the number of outlets and effectively reduces the overall height of the dehydration bin. A material uniform distribution mechanism is further arranged in the straight cylinder section at the upper part of the multi-outlet dehydration bin, which can realize uniform distribution of the coke in the multi-outlet dehydration bin, reduce the conical accumulation of the coke in the bin due to the angle of repose of the coke, and further increase the effective utilization rate of the dehydration bin, so that the overall height of the dehydration bin can be further reduced.

[0024] 4. The delayed coking closed decoking device has a plurality of outlets arranged at the bottom of the multi-outlet dehydration bin, which can effectively shorten the coke transfer time, and due to the increased area of the conical part, the internal filtration area can be increased, and the water filtration time can be reduced.

[0025] 5. The delayed coking closed decoking device of the present application is provided with a flat plate type slag discharge valve at the bottom of the multi-outlet dewatering bin, the opening of the valve can be arbitrarily adjusted, the conveying speed of the material can be controlled by controlling the opening and closing number of the valve and the opening of the single valve, and the load-free starting of the L-shaped dewatering conveyor can be realized.

[0026] 6. The delayed coking closed decoking device of the present application is provided with organism side plates, intermediate support partitions, tail blocking partitions and a plurality of scrapers in the L-shaped dewatering conveyor, which can almost isolate the upper groove body and the lower groove body inside the base body assembly, only a small gap is left for the smooth movement of the scraper, which can effectively prevent the material from leaking from the tail of the upper groove body into the lower body, causing equipment damage.

[0027] 7. The delayed coking closed decoking device of the present application is provided with a water flushing pipeline and a drain at the tail of the base body assembly, a small amount of material leaking from the upper body into the lower body and a small amount of material brought into the lower body by the scraper return can be discharged to the sewage ditch arranged below the equipment through the drain, preventing the material from accumulating at the tail of the base body assembly and causing equipment failure. The sewage ditch is also provided with a water flushing pipeline, which can effectively prevent the sewage ditch from being blocked.

[0028] 8. The delayed coking closed decoking device of the present application is provided with a limiting plate at the feed inlet of the L-shaped dewatering conveyor, the insertion height of the limiting plate into the groove body can be adjusted. It can effectively prevent the material from flowing into the base body assembly, and can also control the thickness of the conveying material layer, which is beneficial to the rapid dewatering of the material during the conveying process, and can also control the conveyor from overloading.

[0029] 9. In the tail wheel assembly of the L-shaped dewatering conveyor of the delayed coking closed decoking device of the present application, a rolling bearing is installed inside each of the two sprockets, a coded disc is installed on the sprocket, a proximity switch is arranged at the corresponding position in the base body assembly, and the rotation of the sprocket is independent. When the chain on one side breaks, the sprocket on that side stops rotating, which can be quickly judged by the proximity switch, preventing more serious consequences caused by the broken chain of the equipment.

[0030] 10. The delayed coking closed decoking device of the present application, the tail wheel assembly of the L-shaped dewatering conveyor is sealed with a pressing plate and a sealing gasket, and the entire tail wheel assembly and part of the tensioning assembly are enclosed in the closed cover arranged outside the base body assembly. Even if there is a large amount of coke water in the base body assembly, the tensioning of the tail wheel assembly can also be carried out without leakage. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a structural schematic diagram of the present application;

[0032] Figure 2 is a schematic diagram of the internal structure of the horizontal section of the L-shaped dewatering conveyor in the present application;

[0033] Figure 3 is the schematic diagram of the arc-shaped guide rail structure of the L-shaped dewatering conveyor bending section in the application;

[0034] Figure 4 is the structural schematic diagram of the tail wheel assembly in the application;

[0035] Figure 5 is the structural schematic diagram of the tensioning assembly in the application;

[0036] Figure 6 is the arrangement reference diagram of the application in use;

[0037] Reference signs: 1, multi-outlet dewatering bin, 101, top cover, 102, upper straight cylinder section, 103, discharge cone, 104, exhaust port, 105, water inlet, 106, overflow port, 107, material uniform distribution mechanism, 108, drainage pipeline, 2, L-shaped dewatering conveyor, 201, machine body assembly, 201a, horizontal section, 201b, bending section, 201c, inclined section, 202, driving assembly, 203, tail wheel assembly, 2031, tail shaft, 2032, sprocket, 2033, rolling bearing, 2034, support sliding seat, 2035, sealing mechanism, 2036, coded disc, 2037, proximity switch, 204, wear-resistant lining plate, 205, chain, 206, scraper, 207, support partition plate, 208, Johnson screen, 209, material blocking partition plate, 210, material limiting plate, 211, flushing nozzle, 212, closed cover, 213, sealing gasket, 214, pressing plate, 215, conical screw, 216, tensioning assembly, 2161, screw rod, 2162, nut, 2163, disc spring, 2164, sealing unit, 2165, support seat, 217, drainage port, 218, arc-shaped guide rail, 3, flat plate type slag discharge valve, 4, coke tower, 5, blowdown ditch, 6, water flushing pipeline. DETAILED DESCRIPTION

[0038] The specific embodiment of the application is described below in combination with the drawings:

[0039] As shown in the figure, the delayed coking decoking device of the present application comprises a multi-outlet dehydration bin 1 and an L-shaped dehydration conveyor 2 arranged below a coke tower 4, the L-shaped dehydration conveyor 2 is a closed conveying structure with only a material outlet arranged at the end of the conveyor, and the multi-outlet dehydration bin 1 comprises a top cover 101, an upper straight cylinder section 102 and a lower conical section, the top cover 101 is provided with a residue inlet opening which is connected with a residue outlet of the bottom of the coke tower 4, the lower conical section is composed of a plurality of discharge cones 103 which are jointly connected below the upper straight cylinder section 102, and each discharge cone 103 is provided with a discharge outlet at the bottom, and each discharge outlet is provided with a flat plate type residue valve 3 which is arranged between the discharge outlet of the multi-outlet dehydration bin 1 and the inlet of the L-shaped dehydration conveyor 2 to realize the conveying of the material in a closed environment.

[0040] The top cover 101 of the multi-outlet dehydration bin 1 is further provided with a water inlet 105 and an exhaust port 104, and the exhaust port 104 is connected with a tail gas treatment device; the upper straight cylinder section 102 of the multi-outlet dehydration bin 1 is in any one of a cylindrical shape, a rectangular cylindrical shape or a polygonal cylindrical shape, and is provided with an overflow port 106 on the side wall, and is internally provided with a material uniform distribution mechanism 107; each discharge cone 103 of the lower conical section of the multi-outlet dehydration bin 1 is provided with a water filtering assembly which is connected with a drainage pipeline 108 arranged outside the discharge cone 103.

[0041] The L-shaped dehydration conveyor 2 comprises a body assembly 201, a driving assembly 202, a tail wheel assembly 203, a chain scraper assembly, a sealing assembly and a tensioning assembly 216, wherein the body assembly 201 is in the shape of a rectangular groove with four closed sides, wear-resistant lining plates 204 are arranged on the left and right side walls inside the rectangular groove-shaped body assembly 201, a partition unit is arranged in the middle of the body assembly 201 for separating the internal cavity of the body assembly 201 into two parts of an upper groove body and a lower groove body, the partition unit comprises a support partition 207 and a Johnson screen 208 laid along the length direction of the body assembly 201, and the mesh size of the Johnson screen 208 is 2-4 mm, the body assembly 201 is composed of a horizontal section 201a, a curved section 201b and an inclined section 201c arranged in a left-right butt joint manner, the horizontal section 201a is arranged directly below the multi-outlet dehydration bin 1, the tail wheel assembly 203 is installed at the end of the horizontal section 201a not connected with the curved section 201b, the curved angle of the curved section 201b is 0-40°, arc-shaped guide rails 218 are arranged in the upper groove body and the lower groove body of the curved section 201b, the arc-shaped guide rails 218 are fixed on the inner side walls of the body assembly 201 and used for limiting the chain 205 which makes a circumferential reciprocating motion in the chain scraper assembly, the driving assembly 202 is installed at the end of the inclined section 201c not connected with the curved section 201b, the chain scraper assembly is arranged inside the body assembly 201 and comprises a chain 205 and a plurality of scrapers 206 arranged on the chain 205 in a left-right interval manner, the chain 205 can make a circumferential reciprocating motion in the upper groove body and the lower groove body under the driving of the driving assembly 202 and the tail wheel assembly 203, so as to realize the movement of the material on the partition unit from the feeding port to the material outlet by the scraper 206.

[0042] A material blocking partition 209 for separating the upper groove body and the lower groove body is arranged at the end of the upper groove body in the horizontal section 201a, the material blocking partition 209 is arranged vertically, a certain gap is reserved between the bottom of the material blocking partition 209 and the partition unit, the size of the gap is greater than the height of the scraper 206, the width of the material blocking partition 209 is consistent with the width of the upper groove body, and the length of the material blocking partition 209 is greater than the interval between every two adjacent scrapers 206 on the chain 205.

[0043] The bottom of the lower groove body in the horizontal section 201a is provided with a drainage port 217, and a drainage ditch 5 is arranged below the drainage port 217, and a water flushing pipeline 6 is arranged in the drainage ditch 5.

[0044] At least one feeding port is arranged on the top of the body assembly 201, and a material limiting plate 210 for limiting the height of the material carried by the scraper 206 after feeding is arranged at each feeding port, the material limiting plate 210 is inserted into the inner wall surface of the top of the body assembly 201, and the limiting height of the material limiting plate 210 is adjustable.

[0045] The tail wheel assembly 203 comprises a tail shaft 2031 and two sprockets 2032 assembled on the tail shaft 2031, one chain 205 is installed on each sprocket 2032, and a rolling bearing 2033 is assembled in the inner part of each sprocket 2032, and an encoder disc 2036 is also installed on each sprocket 2032, and the encoder disc 2036 is provided with a proximity switch 2037 matched therewith in the machine body assembly 201, the matching of the encoder disc 2036 and the proximity switch 2037 can realize rapid discrimination when the chain 205 is broken, and a flushing nozzle 211 for periodic cleaning of each sprocket 2032 is also provided above each sprocket 2032.

[0046] The tail shaft 2031 is provided with a support sliding seat 2034 at each axial end, and the upper and lower ends of the support sliding seat 2034 are provided with sliding grooves, and the machine body assembly 201 is provided with sliding rails matched with the sliding grooves, and the machine body assembly 201 is also provided with a long waist hole for the end of the tail shaft 2031 to pass through, and the sliding of the support sliding seat 2034 on the sliding rails can drive the tail shaft 2031 to slide synchronously in the long waist hole, so as to realize the tension adjustment of the chain installed on the sprocket.

[0047] The sealing assembly is used for end sealing of the tail wheel assembly 203, and the sealing assembly comprises a sealing cover 212 fixed on the machine body assembly 201, the sealing cover 212 is arranged outside the long waist hole, and a sealing gasket 213 and a pressing plate 214 are arranged on the outer side wall of the machine body assembly 201 and matched with the outer circumference of the long waist hole, and the pressing plate 214 is compressed by tapered screws 215 installed on the upper and lower ends of the sealing cover 212;

[0048] The tensioning assembly 216 comprises a screw rod 2161, a nut 2162, a disc spring 2163, a sealing unit 2164 and a support seat 2165, one end of the screw rod 2161 is connected to the support sliding seat 2034 in the tail wheel assembly 203, the other end passes through the end plate in the length direction of the machine body assembly 201, and the axial sealing of the passing-out part is realized by the sealing unit 2164, the support seat 2165 is arranged outside the sealing unit 2164, the nut 2162 is matched and assembled on the screw rod 2161, the disc spring 2163 is arranged between the nut 2162 and the end face of the support seat 2165, and the adjustment of the tightening degree of the nut 2162 on the screw rod 2161 can realize the adjustment and control of the tensioning degree of the tail wheel assembly 203.

[0049] The flat plate type slag discharge valve 3 comprises a valve body, an upper flange and a lower flange arranged on the valve body, and an opening degree adjusting assembly, the flat plate type slag discharge valve 3 is connected with the discharge port of the multi-outlet dewatering bin 1 through the upper flange, is connected with the feeding port of the L-shaped dewatering conveyor 2 through the lower flange, and the opening degree adjusting assembly is provided with an actuator, and the actuator is at least one of a pneumatic device, an electric device or a hydraulic device.

[0050] The delayed coking closed decoking device comprises a multi-outlet dehydration bin, a flat plate type discharge valve and an L-shaped dehydration conveyor.

[0051] The multi-outlet dehydration bin is placed below the coke tower, one bin is arranged below each tower, the straight section of the bin body is not limited in shape, and can be circular, rectangular or other polygons according to actual conditions, four tapered sections are arranged at the lower part of the bin body, each tapered section is provided with a material outlet. The bin interior can be separated or communicated according to requirements, the tapered sections in the bin are provided with water filtering assemblies, and a material flattening device is arranged at the upper part of the straight section of the bin; the flat plate type discharge valve is arranged at the bottom of the bin, and one valve is arranged at each material outlet, the opening degree of the valve can be adjusted arbitrarily, and the discharge amount of the dehydration bin can be effectively controlled.

[0052] The L-shaped dehydration conveyor is placed below the discharge valve, two L-shaped dehydration conveyors are arranged for each dehydration bin, each L-shaped dehydration conveyor is provided with two feeding ports, and each feeding port is connected with the flat plate type discharge valve. The L-shaped dehydration conveyor comprises a machine body assembly, a driving assembly, a tail wheel assembly, a tensioning assembly and a chain scraper assembly, etc.; the head machine body is provided with the driving assembly, the tail machine body is provided with the tail wheel assembly and the tensioning assembly; the inner partition plate of the machine body is provided with a water filtering function; the scraper chain assembly is driven by the driving assembly and the chain wheel in the tail wheel assembly to make circumferential reciprocating motion in the upper and lower groove bodies.

[0053] Taking a two-tower delayed coking device as an example, two multi-outlet dehydration bins are arranged below the two coke towers, the straight sections of the two multi-outlet dehydration bins can be independent or communicated with each other; eight flat plate type discharge valves are arranged at the eight material outlets, and four L-shaped dehydration conveyors are arranged.

[0054] The device can replace the traditional decoking mode and realize closed decoking operation, and two different operation modes can be implemented.

[0055] In the case of strict requirements for the moisture content of coke, operation mode one can be adopted, that is, during the decoking operation, the flat plate type slag discharge valve 3 is closed, a certain amount of water is first injected into the interior of the bin body from the top water inlet 105 of the L-shaped dewatering conveyor 2 to play a buffering role. The coke-water mixture falls into the multi-outlet dewatering bin 1 by gravity during the cutting process. The excess water is discharged outside the bin body through the overflow port 106 during the entire process, and the tail gas generated during the entire process is discharged to the tail gas treatment unit through the top exhaust port 104. The internal arrangement of the material can be changed by the material uniform distribution mechanism 107 to make it uniformly stored inside. After the petroleum coke is completely discharged into the multi-outlet dewatering bin 1, it is dewatered by the internal water filtering assembly, the dewatered water is discharged through the drain pipe 108, and is recycled after further treatment.

[0056] When the moisture content of the material meets the standard, one or two L-shaped dewatering conveyors 2 can be started according to the needs, and then one or two or three or four flat plate type slag discharge valves 3 are opened according to the needs. The coke that has been dewatered once in the multi-outlet dewatering bin 1 falls into the upper trough of the L-shaped dewatering conveyor 2 by gravity. The chain 205 in the L-shaped dewatering conveyor 2 moves in a circumferential reciprocating manner in the upper and lower troughs under the drive of the drive assembly 202 and the tail wheel assembly 203. The scraper 206 is installed on the chain 205 by bolts, and during the movement of the scraper 206 following the chain 205, the material is moved from the inlet to the outlet and is conveyed to the next section. The coke water separated from the coke flows to the lower trough through the Johnson screen 208 provided in the partition unit, and is discharged to the drain ditch 5 through the drain port 217 provided in the lower trough. The upper end of the drain port 217 is provided with a flushing nozzle 211, and the drain ditch 5 is provided with a water flushing pipeline 6 to prevent clogging. The subsequent section of the L-shaped dewatering conveyor 2 can be provided with a stockyard or storage equipment or a next stage of transfer equipment and other schemes.

[0057] If the requirement for the moisture content of the coke is not too strict, operation mode two can be adopted, that is, during the decoking operation, the flat plate type slag discharge valve 3 is closed, a certain amount of water is first injected into the interior of the bin body from the top water inlet 105 of the L-shaped dewatering conveyor 2 to play a buffering role. When the drilling through link in the water power decoking process in the coke tower 4 is completed, the coke-water mixture generated during the drilling through link falls into the multi-outlet dewatering bin 1 by gravity, and then one or two L-shaped dewatering conveyors 2 are started, and then one or two or three or four flat plate type slag discharge valves 3 are opened, and the coke-water mixture falls into the L-shaped dewatering conveyor 2 and is dewatered and conveyed by it. The advantage of operation mode two is that the slag discharge valve needs to be closed only during the water power drilling through link, and the slag discharge valve is opened in the water power cutting mode, so that the cutting, dewatering and conveying are carried out synchronously, the decoking period is short, and the production efficiency is high.

[0058] Example 1

[0059] The delayed coking coke discharging device of the embodiment comprises a multi-outlet dehydration bin 1, an L-shaped dehydration conveyor 2 and a flat plate type coke discharge valve 3 in the device structure, and is applied to the field of delayed coking. The multi-outlet dehydration bin 1 is placed under the coke tower 4 in one-to-one, and the inlet of the dehydration bin is connected with the outlet of the crusher under the tower. The bottom of the dehydration bin is connected with the upper flange of the flat plate type coke discharge valve 3. The dehydration bin of the embodiment has four outlets. Two L-shaped dehydration conveyors 2 are arranged at the bottom of each dehydration bin. Each L-shaped dehydration conveyor 2 is designed with two inlets, and each inlet is connected with the lower flange of the flat plate type coke discharge valve 3. That is, one coke tower is provided with one dehydration bin, four flat plate type coke discharge valves and two L-shaped dehydration conveyors. The number of the devices is the same as the number of the coke towers. The axes of the conveyors in the upper straight sections 102 of the two dehydration bins are arranged in a vertical direction with the horizontal center line of the two coke towers.

[0060] The multi-outlet dehydration bin 1 is fixed on the base platform of the coke tower 4 by a seat type support. The dehydration bin 1 comprises a top cover 101, an upper straight section 102 and a lower conical section. The top cover 101 is provided with an exhaust port 104 and a water inlet 105. The upper straight section 102 can be circular, rectangular or other polygonal according to the actual situation. The upper part of the upper straight section 102 is provided with an overflow port 106 and a material uniform distribution mechanism 107. Four discharge cones 103 are arranged in the lower conical section. Each discharge cone 103 is provided with an outlet at the bottom. The four outlets are connected or separated. Each discharge cone 103 is provided with a water filtering assembly inside and a drainage pipeline 108 outside.

[0061] The flat plate type coke discharge valve 3 is arranged at each outlet of the dehydration bin 1. The opening of the valve can be adjusted arbitrarily. The actuator can be any one or combination of pneumatic device, electric device or hydraulic device. The opening and closing of the valve and the opening of the single valve can be controlled to control the conveying speed of the material, and the no-load start of the conveyor can be realized.

[0062] The L-shaped dehydration conveyor 2 is placed under the dehydration bin. Each L-shaped dehydration conveyor 2 is provided with two inlets at the top, and the inlets are connected with the lower flange of the flat plate type coke discharge valve 3. The L-shaped dehydration conveyor 2 comprises a body assembly 201, which comprises a horizontal section 201a, a curved section 201b and an inclined section 201c. The curved angle of the curved section 201b is designed to be 0-40°. The head of the inclined section 201c is provided with a driving assembly 202, which comprises a main motor, a speed reducer, a coupling, a driving sprocket and a bearing seat. The tail of the horizontal section 201a is provided with a tail wheel assembly 203, and the tail wheel assembly 203 is provided with a tensioning assembly 216.

[0063] The body assembly 201 of the L-shaped dewatering conveyor 2 is a rectangular tank with four closed sides, and wear-resistant lining plates 204 are arranged on the two sides, which can be welded or fixed to the side wall by bolts. The width of the tank on both sides is slightly larger than the length of the scraper 206. A partition unit is arranged in the middle of the body assembly 201 to divide the interior of the body assembly 201 into an upper tank and a lower tank. The partition unit includes a support partition 207 and a Johnson net 208 arranged along the length direction of the body assembly 201. The mesh size of the Johnson net 208 is 2-4 mm.

[0064] The interior of the body assembly 201 is provided with a chain scraper assembly, which is composed of a chain 205, a scraper 206 and a connecting piece. The chain 205 and the scraper 206 are not limited in form, and the scraper 206 is fixed to the chain 205 by the connecting piece. The chain 205 is driven by the driving assembly 202 and the tail wheel assembly 203 to make a circumferential reciprocating motion in the upper tank and the lower tank. The scraper 206 moves the material from the inlet to the outlet of the L-shaped dewatering conveyor 2 in the process of following the chain 205.

[0065] A material blocking partition 209 is arranged at the tail of the body assembly 201 of the L-shaped dewatering conveyor 2. The spacing between the material blocking partition 209 and the support unit is slightly larger than the height of the scraper 206. The horizontal length of the material blocking partition 209 is greater than the spacing between every two adjacent scrapers 206 on the chain 205, so that the upper tank and the lower tank are isolated into intervals that are not connected to each other at the tail of the body assembly 201. Only a small gap is left for smooth movement of the scraper 206, which can effectively prevent the material from leaking from the tail of the upper body assembly 201 into the lower body.

[0066] A plurality of inlets can be arranged on the top of the body assembly 201. The number of inlets is related to the number of outlets of the multi-outlet dewatering bin 1 and the arrangement number of the L-shaped dewatering conveyor 2. A material limiting plate 210 is arranged at each inlet. The insertion height of the material limiting plate 210 can be adjusted, which can effectively prevent the material from flowing into the body and also control the thickness of the conveying material layer to prevent the L-shaped dewatering conveyor 2 from overloading. A structure for supporting and guiding the material limiting plate 210 is arranged in the interior of the body assembly 201.

[0067] Arc-shaped guide rails 218 for limiting are arranged in the upper tank and the lower tank of the curved section 201b of the body assembly 201. The arc-shaped guide rails 218 can be composed of one or several sections. The head and tail of each section are bent upward with a small arc to make the scraper 206 and the chain 205 smoothly enter the guide rail. The joints between the sections are connected at an oblique angle, which is beneficial to the smooth transition of the scraper 206 at the joint. The cross section is L-shaped, which can be fixed to the side wall of the body assembly 201 by bolt connection or welding.

[0068] The tail wheel assembly 203 is provided at the tail of the machine body assembly 201, which is composed of a tail shaft 2301, a chain wheel 2302, a rolling bearing 2303, a support sliding seat 2304, a sealing mechanism 2305, etc. The rolling bearing 2303 is installed inside each of the two chain wheels 2302. The chain wheel 2302 is provided with an encoder disc 2306, and the corresponding position in the machine body assembly 201 is provided with a proximity switch 2307. The operation of the chain wheel 2302 is independent, and when the chain 205 on one side is broken, the chain wheel 2302 on that side will stop rotating. The proximity switch 2307 can quickly detect the situation and prevent more serious consequences caused by the broken chain of the equipment. The chain wheel 2302 is provided with a flushing nozzle 211 above.

[0069] The support sliding seat 2304 at both ends of the tail wheel assembly 203 is provided with a sliding groove, and the machine body assembly 201 is provided with a sliding rail matched with the sliding groove. The sliding groove is clamped on the sliding rail and can slide forward and backward along the sliding rail. Long waist holes are opened on the two side walls of the machine body assembly 201, and the tail shaft 2301 passes through the long waist holes. The sliding of the support sliding seat 2304 on the sliding rail can drive the tail shaft 2301 to slide synchronously in the long waist hole, so as to adjust the tension of the chain 205 installed on the chain wheel 2302. The entire tail wheel assembly 203 is enclosed in the sealing cover 212 provided on the machine body assembly 201. The sealing gasket 213 and the pressing plate 214 are further provided outside the long waist hole of the side wall of the machine body assembly 201. The pressing plate 214 is pressed by the conical screws 215 installed at the upper and lower ends of the sealing cover 212.

[0070] The tensioning assembly 216 includes a screw rod 2161, a nut 2162, a disc spring 2163, a sealing unit 2164, a support seat 2165, etc. One end of the screw rod 2161 is connected with the support sliding seat 2304 in the tail wheel assembly 203, the rod body passes through the hole of the machine body end plate, the hole is sealed by the sealing unit 2164, and the disc spring 2163 can prevent the nut 2162 from loosening and produce a certain adjustment amount.

[0071] When the L-shaped dewatering conveyor 2 operates for a certain period of time, the chain 205 will be stretched and relaxed. At this time, the tensioning assembly 216 is used to tighten the chain 205. The specific operation steps are as follows: loosen the conical screws 215 at the upper and lower ends of the sealing cover 212, separate the sealing gasket 213 and the pressing plate 214, which are tightly attached to the side plate of the machine body assembly 201 for sealing the tail chain wheel shaft, from the side wall, then adjust the nut 2162 on the tensioning assembly 216, make the screw rod 2161 stretch outwards to tighten the chain 205, and then tighten the conical screws 215 again to press the sealing gasket 213 and the pressing plate 214 against the side wall.

[0072] A drainage port 217 is provided at the bottom of the tail groove of the machine body assembly 201. The lower end of the drainage port 217 is provided with a sewage ditch 5, and the sewage ditch 5 is provided with a water flushing pipeline 6.

Claims

1. A delayed coking decoking apparatus, characterized by, The application relates to a coke tower dehydration device, which comprises a multi-outlet dehydration bin (1) arranged below a coke tower (4) and an L-shaped dehydration conveyor (2), wherein the L-shaped dehydration conveyor (2) is a closed conveyor structure provided with a material outlet only at the conveying terminal end, the multi-outlet dehydration bin (1) comprises a top cover (101), an upper straight cylinder section (102) and a lower conical section, a water inlet (105) for injecting water into the bin to play a buffering role and a discharge port for connecting with a discharge port at the bottom of the coke tower (4) are arranged on the top cover (101), a material uniform distribution mechanism (107) is horizontally arranged in the upper straight cylinder section (102), the lower conical section is composed of multiple discharge cones (103), and the multiple discharge cones (103) are jointly connected below the upper straight cylinder section (102); a water filtering assembly is arranged in each discharge cone (103) and connected with a drainage pipeline (108) arranged outside the discharge cone (103), a discharge outlet is arranged at the bottom of each discharge cone (103), and a flat plate type discharge valve (3) is installed at each discharge outlet, the flat plate type discharge valve (3) is arranged in a vertical connection mode between the discharge outlet of the multi-outlet dehydration bin (1) and the feeding port of the L-shaped dehydration conveyor (2) so as to realize material conveying in a closed environment. The L-shaped dehydration conveyor (2) comprises a body assembly (201), a driving assembly (202), a tail wheel assembly (203) and a chain scraper assembly, a partition plate unit for separating the internal cavity of the body assembly (201) into an upper groove body and a lower groove body is arranged at the middle portion of the body assembly (201), the partition plate unit comprises a support partition plate (207) and a Johnson net (208) arranged along the length direction of the body assembly (201); the body assembly (201) is composed of a horizontal section (201a), a curved section (201b) and an inclined section (201c) arranged in a vertical connection mode, and the horizontal section (201a) is arranged directly below the multi-outlet dehydration bin (1); a plurality of feeding ports are arranged at the top of the body assembly (201), and each feeding port is connected with the flat plate type discharge valve; A material limiting plate (210) for limiting the material height of the scraper (206) after feeding is arranged at each feeding port, the material limiting plate (210) is inserted into the inner wall surface at the top of the body assembly (201), and the limiting height of the material limiting plate (210) is adjustable; Arc-shaped guide rails (218) are arranged in the upper groove body and the lower groove body of the curved section (201b), the arc-shaped guide rails (218) are fixed on the inner side wall of the body assembly (201) and are used for limiting the chain (205) in the chain scraper assembly which makes a circumferential reciprocating motion. The tail wheel assembly (203) comprises a tail shaft (2031) and two sprockets (2032) assembled on the tail shaft (2031), one chain (205) is installed on each sprocket (2032), and a rolling bearing (2033) is assembled in the inner part of each sprocket (2032), and an encoder disc (2036) is also installed on each sprocket (2032), and the encoder disc (2036) is matched with a proximity switch (2037) arranged in the machine body assembly (201), and the matching of the encoder disc (2036) and the proximity switch (2037) realizes rapid discrimination when the chain (205) is broken.

2. A delayed coking decoking apparatus according to claim 1 wherein: The top cover (101) of the multi-outlet dehydration bin (1) is also provided with an exhaust port (104), and the exhaust port (104) is connected with a tail gas treatment device; the upper straight cylinder section (102) of the multi-outlet dehydration bin (1) is in a cylindrical or polygonal cylindrical shape, and the overflow port (106) is arranged on the side wall of the upper straight cylinder section (102).

3. A delayed coking decoking apparatus as defined in claim 1, wherein: The top cover (101) of the multi-outlet dehydration bin (1) is also provided with an exhaust port (104), and the exhaust port (104) is connected with a tail gas treatment device; the upper straight cylinder section (102) of the multi-outlet dehydration bin (1) is in a cylindrical or polygonal cylindrical shape, and the overflow port (106) is arranged on the side wall of the upper straight cylinder section (102).

4. A delayed coking decoking apparatus as defined in claim 1, wherein: The flat plate type slag discharge valve (3) comprises a valve body, an upper flange, a lower flange and an opening adjusting assembly arranged on the valve body, the flat plate type slag discharge valve (3) is connected with the discharge port of the multi-outlet dehydration bin (1) through the upper flange, is connected with the feeding port of the L-shaped dehydration conveyor (2) through the lower flange, and the opening adjusting assembly is provided with an actuator, which is at least one of a pneumatic device, an electric device or a hydraulic device.

5. A delayed coking decoking apparatus as defined in claim 1 wherein: The machine body assembly (201) is in a rectangular groove structure which is closed on four sides, wear-resistant lining plates (204) are arranged on the left and right side walls in the interior of the rectangular groove structure machine body assembly (201), the tail wheel assembly (203) is installed at the end of the horizontal section (201a) which is not connected with the curved section (201b), the bending angle of the curved section (201b) is 0~40°, the driving assembly (202) is installed at the end of the inclined section (201c) which is not connected with the curved section (201b), the chain scraper assembly is arranged in the interior of the machine body assembly (201) and comprises a chain (205) and a plurality of scrapers (206) which are arranged on the chain (205) at intervals left and right, and the chain (205) can make circumferential reciprocating motion in the upper groove body and the lower groove body under the driving of the driving assembly (202) and the tail wheel assembly (203), so that the scrapers (206) drive the material on the baffle unit to move from the feeding port to the material outlet.

6. A delayed coking decoking apparatus as defined in claim 1, wherein: The mesh size of the Johnson screen (208) is 2~4mm.

7. A delayed coking decoking apparatus as defined in claim 5 wherein: The end of the upper groove body in the horizontal section (201a) is provided with a material blocking partition plate (209) for separating the upper groove body and the lower groove body, the material blocking partition plate (209) is vertically arranged, and a certain gap is reserved between the bottom of the material blocking partition plate (209) and the partition plate unit, the size of the gap is greater than the height of the scraper (206), the width of the material blocking partition plate (209) is consistent with the width of the upper groove body, and the length of the material blocking partition plate (209) is greater than the interval between every two adjacent scrapers (206) on the chain (205).

8. A delayed coking decoking apparatus as defined in claim 5 wherein: A flushing nozzle (211) for periodically cleaning the chain wheel (2032) is further arranged above the chain wheel (2032). The tail shaft (2031) is provided with a support sliding seat (2034) at each axial end, the upper and lower ends of the support sliding seat (2034) are provided with sliding grooves, the machine body assembly (201) is provided with sliding tracks matched with the sliding grooves, and the machine body assembly (201) is further provided with a long waist hole for the end of the tail shaft (2031) to pass through, and the sliding of the support sliding seat (2034) on the sliding tracks can drive the tail shaft (2031) to slide synchronously in the long waist hole, so as to adjust the tension of the chain (205) installed on the chain wheel (2032). The L-shaped dehydration conveyor (2) further comprises a sealing assembly for sealing the end of the tail wheel assembly (203), the sealing assembly comprises a sealing cover (212) fixed on the machine body assembly (201), the sealing cover (212) is arranged outside the long waist hole, and a sealing gasket (213) and a pressing plate (214) are arranged on the outer side wall of the machine body assembly (201) and matched with the outer circumference of the long waist hole, and the pressing plate (214) is compressed by tapered screws (215) installed on the upper and lower ends of the sealing cover (212). The L-shaped dehydration conveyor (2) further comprises a tensioning assembly (216), the tensioning assembly (216) comprises a screw rod (2161), a nut (2162), a disc spring (2163), a sealing unit (2164) and a support seat (2165), one end of the screw rod (2161) is connected to the support sliding seat (2034) in the tail wheel assembly (203), the other end passes through the end plate in the length direction of the machine body assembly (201) and is axially sealed at the passing-out part by the sealing unit (2164), the support seat (2165) is arranged outside the sealing unit (2164), the nut (2162) is matched and assembled on the screw rod (2161), the disc spring (2163) is arranged between the nut (2162) and the end face of the support seat (2165), and the adjustment of the tightening degree of the nut (2162) on the screw rod (2161) can realize the regulation and control of the tensioning degree of the tail wheel assembly (203).

9. A delayed coking decoking apparatus as defined in claim 5 wherein: The bottom of the lower groove body in the horizontal section (201a) is provided with a drainage port (217), and a sewage ditch (5) is arranged below the drainage port (217), and a water flushing pipeline (6) is arranged in the sewage ditch (5).

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