Green coke drying system

Abstract

The utility model relates to a green coke drying system which comprises a crusher, a green coke belt conveyor is arranged at the output end of the crusher, an electric plow discharger is arranged on the green coke belt conveyor, the output end of the green coke belt conveyor is arranged at the feeding position of a screening machine, a front end conveyor is arranged on the lower side of the green coke belt conveyor, and a rear end conveyor is arranged on the lower side of the screening machine. The output end of the front-end conveyor is connected with a feeding screw feeder, the output end of the feeding screw feeder is connected with a green coke drying machine, the green coke drying machine is provided with a shell and an inner cylinder, a ventilation inner cavity is formed between the shell and the inner cylinder, the inner cylinder is obliquely arranged downwards in the feeding direction, and the lower end of the shell is provided with a steam inlet and a condensate water outlet; a tail gas outlet is formed in the upper end of the shell, a discharging port is formed in the lower end of the shell, and the discharging port conveys tail gas to a screening machine through a plurality of rear end conveyors. The coke screening device can be used for drying green coke and screening coke breeze in the green coke, so that overtemperature of the rotary kiln during subsequent calcination of the green coke is avoided.

Description

Technical Field

[0001] The utility model relates to a drying system, in particular to a green coke drying system. Background Art

[0002] Needle coke is a high-quality variety vigorously developed in carbon materials. Its appearance is a porous solid with silver-gray color and metallic luster. Its structure has obvious flow texture, large and few pores, and is slightly oval in shape. The particles have a large aspect ratio, with a fibrous or needle-like texture direction, and feel smooth to the touch. It is the raw material for producing high-end carbon products such as ultra-high power graphite electrodes, special carbon materials, carbon fibers and their composites.

[0003] If the content of fine coke in the green coke is high and the moisture content is also high, it is easy to cause blockage of the silo and pipeline during transportation and storage, and often requires manual cleaning.

[0004] The green coke can be calcined into needle coke through the rotary kiln calcination unit. However, if the water content of the green coke is high, there will be a situation of coke explosion when it enters the rotary kiln for calcination, resulting in a large amount of fine coke. A large amount of fine coke burns and releases heat, causing the rotary kiln to have an over-temperature phenomenon; if the content of fine coke in the green coke is high and there is no separation of coarse and fine materials, a large amount of fine coke enters the rotary kiln, and the burn loss of the green coke is close to 50%. At the same time, the combustion of fine coke releases heat. To ensure no over-temperature, the device cannot operate at full load. Therefore, the current rotary kiln calcination unit cannot operate at full load. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a green coke drying and screening system, which can dry the green coke and screen out the fine coke in the green coke, so as to avoid the over-temperature of the rotary kiln during the subsequent calcination of the green coke.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A green coke drying system includes a crusher. The output end of the crusher is provided with a green coke belt conveyor. The green coke belt conveyor is provided with an electric plough diverter. The output end of the green coke belt conveyor is arranged at the feeding place of a screening machine. The lower side of the green coke belt conveyor is provided with a front conveyor. The output end of the front conveyor is connected with a feeding screw feeder. The output end of the feeding screw feeder is connected with a green coke dryer. The green coke dryer is provided with a shell and an inner cylinder. There is a ventilation inner cavity between the shell and the inner cylinder. The inner cylinder is inclined downward along the feeding direction. The lower end of the shell is provided with a steam inlet and a condensate outlet. The upper end of the shell is provided with a tail gas outlet. The lower end of the shell is provided with a discharge port. The discharge port is conveyed to the screening machine through a plurality of rear conveyors. The screening machine is provided with a fine coke discharge port and a coarse coke discharge port:

[0008] The fine coke discharge port is arranged at the fine coke weighing electronic belt scale feeder. The output end of the fine coke weighing electronic belt scale feeder is successively connected with two bin conveyors;

[0009] The coarse focus discharge port is arranged at the feeder of the coarse material weighing electronic belt scale, and the output end of the coarse material weighing electronic belt scale feeder is connected with a kiln feeding conveyor.

[0010] Specifically, it includes a first dust removal cloth bag, the first dust removal cloth bag is connected with a first induced draft fan and an air inlet pipe, and first dust removal suction pipes are arranged at the material receiving places of the green coke belt conveyor, the front conveyor, the feeding screw feeder, and the rear conveyor, and each first dust removal suction pipe is connected with the first dust removal cloth bag.

[0011] Specifically, it includes a second dust removal cloth bag, the second dust removal cloth bag is connected with a second induced draft fan and an air inlet pipe, and second dust removal suction pipes are arranged at the material receiving places of the fine coke weighing electronic belt scale feeder, the coarse material weighing electronic belt scale feeder, the bin feeding conveyor, and the kiln feeding conveyor, and each second dust removal suction pipe is connected with the second dust removal cloth bag.

[0012] Specifically, the air inlet pipe is provided with an air valve.

[0013] Specifically, the first induced draft fan is connected with an air outlet pipe, and the air outlet pipe is connected with an air valve.

[0014] Specifically, the second induced draft fan is connected with an air outlet pipe, and the air outlet pipe is connected with an air valve.

[0015] Specifically, both the front conveyor and the rear conveyor are large inclination angle belt conveyors for feeding.

[0016] Specifically, the included angle between the inner cylinder and the ground is less than 5°.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] After the green coke is dried, it is transported to a screening machine for screening, the fine coke in the green coke is screened out, and the remaining coarse material is sent to the rotary kiln calcination unit for calcination to produce needle coke. Since the green coke coarse material has been dried and the fine coke in it has been screened out, during the process of transporting it to the rotary kiln calcination unit for calcination, there will be no situation of coke explosion due to too high moisture content, nor will too much heat be released due to the combustion of fine coke, thus avoiding overheating of the rotary kiln calcination unit, and enabling the rotary kiln calcination unit to operate at full load. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the green coke drying system;

[0021] Figure 2 is Figure 1 partial view of;

[0022] Figure 3 View of the green coke dryer;

[0023] Figure 4 is Figure 1 partial view of.

[0024] In the figure:

[0025] 1. Crusher; 2. Green coke belt conveyor; 3. Screening machine; 4. Front-end conveyor; 5. Feeding screw feeder; 6. Green coke dryer; 7. Rear-end conveyor; 8. Fine coke weighing electronic belt scale feeder; 9. Electric plough-type discharger; 10. Bin feeding conveyor; 11. Kiln feeding conveyor; 12. Coarse material weighing electronic belt scale feeder; 13. First dust removal cloth bag; 14. First induced draft fan; 15. Second dust removal cloth bag; 16. Second induced draft fan. Specific implementation mode

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0027] See Figures 1 to 4 , a green coke drying system, including a crusher 1, and a green coke belt conveyor 2 is provided at the output end of the crusher 1. An electric plough-type discharger 9 is provided on the green coke belt conveyor 2, and the output end of the green coke belt conveyor 2 is arranged at the feeding place of the screening machine 3.

[0028] A front-end conveyor 4 is provided on the lower side of the green coke belt conveyor 2, and the output end of the front-end conveyor 4 is connected with a feeding screw feeder 5. The output end of the feeding screw feeder 5 is connected with a green coke dryer 6. The green coke dryer 6 is provided with a housing and an inner cylinder, and a ventilation inner cavity is provided between the housing and the inner cylinder. The inner cylinder is inclined downward along the feeding direction. A steam inlet and a condensate outlet are provided at the lower end of the housing. A tail gas outlet is provided at the upper end of the housing. A discharge outlet is provided at the lower end of the housing, and the discharge outlet is conveyed to the screening machine 3 through a plurality of rear-end conveyors 7. The screening machine 3 is provided with a fine coke discharge outlet and a coarse material discharge outlet:

[0029] The fine coke discharge outlet is arranged at the fine coke weighing electronic belt scale feeder 8, and the output end of the fine coke weighing electronic belt scale feeder 8 is successively connected with two bin feeding conveyors 10.

[0030] The coarse focus discharge port is arranged at the feeding position of the coarse material weighing electronic belt scale feeder 12, and the output end of the coarse material weighing electronic belt scale feeder 12 is connected to the kiln feeding conveyor 11.

[0031] Specifically, the green coke drying system includes a first dust removal cloth bag 13, and the first dust removal cloth bag 13 is connected to a first induced draft fan 14 and an air inlet pipe. First dust suction pipes are provided at the receiving positions of the green coke belt conveyor 2, the front conveyor 4, the feeding screw feeder 5, and the rear conveyor 7, and each first dust suction pipe is connected to the first dust removal cloth bag 13.

[0032] Specifically, the green coke drying system includes a second dust removal cloth bag 15, and the second dust removal cloth bag 15 is connected to a second induced draft fan 16 and an air inlet pipe. Second dust suction pipes are provided at the receiving positions of the fine coke weighing electronic belt scale feeder 8, the coarse material weighing electronic belt scale feeder 12, the silo feeding conveyor 10, and the kiln feeding conveyor 11, and each second dust suction pipe is connected to the second dust removal cloth bag 15.

[0033] Specifically, the air inlet pipe is provided with an air valve.

[0034] Specifically, the first induced draft fan 14 is connected to an air outlet pipe, and the air outlet pipe is connected to an air valve.

[0035] Specifically, the second induced draft fan 16 is connected to an air outlet pipe, and the air outlet pipe is connected to an air valve.

[0036] Specifically, the front conveyor 4 and the rear conveyor 7 are both large inclination belt conveyors for feeding.

[0037] Specifically, the angle between the inner cylinder and the ground is less than 5°.

[0038] The working principle of the green coke drying system of the present utility model is as follows:

[0039] When the green coke is crushed by the crusher 1, a water content detector (not shown in the figure) detects the green coke:

[0040] If the water content of the green coke is too high, during the process of the green coke following the green coke belt conveyor 2, the electric plough diverter 9 abuts against the upper belt surface of the green coke belt conveyor 2, so as to dial the green coke down to the front conveyor 4 below it, and then convey it to the feeding screw feeder 5, and then enter the green coke dryer 6.

[0041] The green coke dryer 6 adopts an indirect drying method. The heating steam is input from the bottom end of the shell of the green coke dryer 6, flows through the cavity between the inner cylinder and the shell, and the steam tail gas is discharged from the upper end of the shell. The green coke is sent to the inner wall of the inner cylinder of the green coke dryer 6, and the inner cylinder rotates, so as to repeatedly stir-fry the green coke. The green coke gradually slides down along the inner wall of the inner cylinder to the bottom end of the inner cylinder, and finally is output through the discharge port to the rear conveyor 7. After being conveyed by a number of rear conveyors 7, it is sent to the screening machine 3.

[0042] If the water content of the green coke meets the requirements, the electric plough-type tripper 9 leaves the upper belt surface of the green coke belt conveyor 2, and the green coke is directly conveyed by the green coke belt conveyor 2 to the screening machine 3.

[0043] The screening machine 3 divides the green coke into fine coke and coarse material: the fine coke is conveyed through the fine coke discharge port to the fine coke weighing electronic belt scale feeder 8, and then is conveyed into the green coke bin for storage by the bin conveyor 10; the coarse coke is conveyed through the coarse material discharge port to the coarse material weighing electronic belt scale feeder 12, and then is conveyed to the rotary kiln calcination unit by the kiln conveyor 11 for calcination.

[0044] In the present utility model, the water content of the green coke is detected immediately after the green coke is crushed, and the green coke with excessive water content is conveyed to the green coke dryer 6 for drying. The steam only flows through the inner cavity of the green coke dryer 6, and indirectly dries the green coke at a low temperature through the cylinder wall. The steam does not directly contact the green coke, thus avoiding the generation of multi-component tail gas due to the interaction with the green coke, thereby reducing the treatment volume and treatment difficulty of the tail gas treatment. The indirect heating of the steam utilizes the latent heat of the steam. During the heat release process of the steam, the temperature is constant, the heat transfer is stable, and the efficiency is high. The amount of waste gas used for steam drying is reduced by about 30% or more compared with that for flue gas drying, saving the waste gas treatment cost. Using 1.0MPaG, 180°C steam as the heating medium, the operating temperature is relatively low compared with hot air, the temperature is easy to control, the process is simple, the process pipeline is small, there is no auxiliary equipment, reducing the equipment floor area, and the investment is relatively small.

[0045] The green coke after drying is conveyed to the screening machine 3 for screening, the fine coke in the green coke is screened out, and the remaining coarse material is sent to the rotary kiln calcination unit for calcination to produce needle coke. Since the green coke coarse material has been dried and the fine coke in it has been screened out, during the process of conveying it to the rotary kiln calcination unit for calcination, there will be no situation of coke explosion due to excessive water content, nor will too much heat be released due to the combustion of the fine coke, thus avoiding overheating of the rotary kiln calcination unit, and enabling the rotary kiln calcination unit to operate at full load.

[0046] The above is only a preferred embodiment of the present utility model, and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content within the scope of the technical solution of the present utility model to make equivalent embodiments with equivalent changes, but as long as it does not depart from the content of the technical solution of the present utility model, any brief modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A green coke drying system, characterized in that: It includes a crusher. An uncalcined coke belt conveyor is provided at the output end of the crusher. An electric plough diverter is provided on the uncalcined coke belt conveyor. The output end of the uncalcined coke belt conveyor is arranged at the feeding place of a screening machine. A front conveyor is provided under the uncalcined coke belt conveyor. The output end of the front conveyor is connected to a feeding screw feeder. The output end of the feeding screw feeder is connected to an uncalcined coke dryer. The uncalcined coke dryer is provided with a housing and an inner cylinder. An air vent cavity is provided between the housing and the inner cylinder. The inner cylinder is inclined downward along the feeding direction. A steam inlet and a condensate outlet are provided at the lower end of the housing. A tail gas outlet is provided at the upper end of the housing. A discharge outlet is provided at the lower end of the housing. The discharge outlet is conveyed to the screening machine through a plurality of rear conveyors. The screening machine is provided with a fine coke discharge outlet and a coarse coke discharge outlet: The fine coke discharge outlet is arranged at the fine coke weighing electronic belt scale feeder. The output end of the fine coke weighing electronic belt scale feeder is sequentially connected to two bin conveyors; The coarse coke discharge outlet is arranged at the coarse material weighing electronic belt scale feeder. The output end of the coarse material weighing electronic belt scale feeder is connected to a kiln conveyor.

2. The coke drying system according to claim 1, characterized in that: It includes a first dust removal cloth bag. The first dust removal cloth bag is connected to a first induced draft fan and an air inlet pipe. First dust removal suction pipes are provided at the material receiving places of the uncalcined coke belt conveyor, the front conveyor, the feeding screw feeder, and the rear conveyor. Each first dust removal suction pipe is connected to the first dust removal cloth bag.

3. The coke drying system according to claim 1, characterized in that: It includes a second dust removal cloth bag. The second dust removal cloth bag is connected to a second induced draft fan and an air inlet pipe. Second dust removal suction pipes are provided at the material receiving places of the fine coke weighing electronic belt scale feeder, the coarse material weighing electronic belt scale feeder, the bin conveyors, and the kiln conveyor. Each second dust removal suction pipe is connected to the second dust removal cloth bag.

4. The coke drying system according to claim 2 or 3, characterized in that: An air valve is provided on the air inlet pipe.

5. The coking drying system according to claim 2, wherein: The first induced draft fan is connected to an air outlet pipe. The air outlet pipe is connected to an air valve.

6. The coking drying system according to claim 3, characterized in that: The second induced draft fan is connected to an air outlet pipe. The air outlet pipe is connected to an air valve.

7. The coking drying system according to claim 1, wherein: The front conveyor and the rear conveyor are both large-inclination feeding belt conveyors.

8. The coking drying system according to claim 1, wherein: The included angle between the inner cylinder and the ground is less than 5°.

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