A coke oven with flue gas recirculation and a system and method thereof

Abstract

The application discloses a smoke recirculation coke oven and a system and method thereof, wherein the smoke recirculation coke oven comprises a furnace body; the furnace body is sequentially provided with a carbonization section, an activation section and a cooling section which are communicated with each other from top to bottom; the furnace body is provided with a plurality of material channels at the carbonization section and the activation section; the material channels are arranged at intervals, and the periphery of the material channels is a smoke passage; the material channel is provided with a smoke recirculation passage, and the smoke recirculation passage is communicated with a smoke recirculation pipeline; the top, the middle and the bottom of the smoke recirculation passage are all provided with sealing sections, and a plurality of smoke sub-passages are arranged between the adjacent two sealing sections; the smoke sub-passage is communicated with the smoke recirculation passage and a material layer; a plurality of pyrolysis gas passages and a plurality of activation gas passages are arranged on the material channel, the pyrolysis gas passages are located at the carbonization section, and the activation gas passages are located at the activation section. The smoke recirculation coke oven can significantly reduce the risk of tar and fine powder mixture coking and fouling.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of material preparation, and particularly relates to a coke oven and a system and a method for preparing coke by recycling flue gas. BACKGROUND

[0002] Coal is not only a fuel, but also a cheap and readily available raw material for preparing carbon materials. Currently, the active coke used for desulfurization and denitrification is prepared from coal. The existing carbonization and activation equipment for preparing active coke is a horizontal rotary furnace and a vertical Slep furnace. Among them:

[0003] The horizontal rotary furnace realizes material turnover by rotating the furnace body at a certain angle, thereby realizing material carbonization and activation with activator. However, the horizontal rotary furnace has problems such as large floor area, high investment cost, and low temperature control precision.

[0004] The material channel and flue of the vertical Slep furnace are arranged alternately, the furnace body is arranged in a square shape, the flue and the material channel are both thin-layer cuboid channels, the material channel is made of refractory bricks, the width of the material channel is small, and the cross-sectional area of the refractory bricks is large, which leads to a large size of the furnace body. In addition, the heat transfer performance of the refractory bricks is poor, which leads to slow start-up and adjustment rate of the coke oven, and the coke oven cannot realize flexible adjustment and raw material adaptability. The generation of activation steam in the vertical Slep furnace is realized by switching the left and right combustion chambers of the regenerative bricks, and the process is complex, and the steam temperature is uncontrollable. The vertical Slep furnace can only activate the carbonized material, because during the heating process of the carbonized material, there is less tar, volatile matter, and fine broken powder, and it is not easy to cause problems such as coking and scaling of the furnace wall, blockage of the gas channel, and sticking of the material into a group. Therefore, the vertical Slep furnace is only an activation furnace, and cannot be used as a carbonization and activation furnace for one-step coke making from raw coal. The adaptability of the raw material is poor for fixed particles and specific operating parameters. The activation water vapor of the vertical Slep furnace passes along the two sides of the active coke layer in parallel, slowly penetrates into the active coke layer during the forward process of the water vapor, and the activation speed is slow. The activator does not fully contact with the active coke, and the activation effect is poor. SUMMARY

[0005] Therefore, one object of the present application is to provide a coke oven for recycling flue gas, which can improve the temperature of the tar carried by the flue gas by recycling high-temperature flue gas in the carbonization section, and realize in-situ gasification of the tar, thereby significantly reducing the risk of coking and scaling of the tar mixed with fine powder.

[0006] Another object of the present application is to provide a coke making system.

[0007] Still another object of the present application is to provide a preparation method of active coke.

[0008] To achieve the above object, the first aspect of the present application provides a flue gas recirculation coke oven, comprising an oven body; the oven body is sequentially provided with a carbonization section, an activation section and a cooling section from top to bottom, which are communicated with each other; the oven body is provided with a plurality of material channels at the part of the carbonization section and the activation section; the plurality of material channels are arranged at intervals, and the periphery of the plurality of material channels is a flue gas passage;

[0009] The material channel is provided with a flue gas recirculation passage, and the flue gas recirculation passage is communicated with a flue gas recirculation pipeline; the top, middle and bottom of the flue gas recirculation passage are each provided with a sealing section, and a plurality of flue gas sub-passages are arranged between adjacent two sealing sections; the flue gas sub-passage is communicated with the flue gas recirculation passage and the material layer; a plurality of pyrolysis gas passages and a plurality of activation gas passages are arranged on the material channel, the plurality of pyrolysis gas passages are located in the carbonization section, and the plurality of activation gas passages are located in the activation section; the pyrolysis gas passage and the activation gas passage are each communicated with the material channel and the flue gas passage;

[0010] The flue gas passage is provided with an air combustion support pipe.

[0011] In some embodiments of the present application, the part of the flue gas recirculation passage located in the carbonization section is communicated with the flue gas recirculation pipeline, and the part of the flue gas recirculation passage located in the activation section is communicated with the flue gas recirculation pipeline and a water vapor pipeline.

[0012] In some embodiments of the present application, the sealing section at the top of the flue gas recirculation passage is an upper sealing section, the sealing section in the middle is a middle sealing section, and the sealing section at the bottom is a lower sealing section; the upper sealing section is located at the top of the carbonization section, the middle sealing section is located between the carbonization section and the activation section, and the lower sealing section is located at the bottom of the activation section; the height of the upper sealing section, the middle sealing section and the lower sealing section is 2-5 times the internal width of the material channel.

[0013] In some embodiments of the present application, a plurality of flue gas sub-passages are arranged at intervals on the side wall of the flue gas recirculation passage from top to bottom.

[0014] In some embodiments of the present application, the flue gas sub-passage is a ring-shaped heat-resistant turning structure with an acute angle with the horizontal plane.

[0015] In some embodiments of the present application, the plurality of pyrolysis gas passages and the plurality of activation gas passages are arranged at intervals and staggered on the side wall of the material layer from top to bottom.

[0016] In some embodiments of the present application, the flue gas recirculation pipeline is communicated with the first flue gas outlet; the first flue gas outlet is arranged on the side wall of the oven body, and the first flue gas outlet is located in the carbonization section.

[0017] In some embodiments of the present application, the top of the material layer is communicated with the feed inlet at the top of the furnace body, the bottom of the material layer is communicated with the cooling section, and the cooling section is communicated with the active coke outlet at the bottom of the furnace body; and the cooling section is provided with a cooling pipeline.

[0018] To achieve the above-mentioned purpose, the second aspect of the present application provides a coke making system, which comprises the flue gas recirculation coke oven, the combustion furnace and the steam generator according to the embodiments of the present application.

[0019] The first flue gas outlet of the flue gas recirculation coke oven is communicated with a flue, the flue is communicated with a first pipeline, a second pipeline and a gas inlet of the combustion furnace, the first pipeline is communicated with a part of the flue gas recirculation channel located in the carbonization section, and the second pipeline is communicated with a part of the flue gas recirculation channel located in the activation section.

[0020] The combustion furnace is provided with an air supplement combustion tube bundle, and the flue gas outlet of the combustion furnace is communicated with the flue gas inlet of the steam generator.

[0021] The steam outlet of the steam generator is communicated with the second pipeline, the flue gas outlet of the steam generator is communicated with a chimney, and the coolant inlet of the steam generator is communicated with a feed water pump.

[0022] To achieve the above-mentioned purpose, the third aspect of the present application provides a preparation method of active coke, which comprises the following steps.

[0023] The raw coal particles enter the coke oven to be carbonized, and the flue gas from the first pipeline is sequentially passed through the flue gas sub-channel of the carbonization section, the material layer in the material channel and the pyrolysis gas channel after heat exchange with the raw coal particles in the carbonization section, carries the tar and volatile matter generated by carbonization into the flue gas channel, and burns with the supplemented air in the flue gas channel to supplement the heat for the carbonization process.

[0024] The process water is pressurized by the feed water pump and then enters the steam generator to be gasified, and then is mixed with the flue gas from the second pipeline to enter the activation section to react with the material from the carbonization section, and then the mixed gas of the flue gas and the water vapor is sequentially passed through the flue gas sub-channel of the activation section, the material layer in the material channel and the activation gas channel, carries the water gas generated by activation into the flue gas channel, and the water gas burns with the supplemented air in the flue gas channel to provide supplemental heat for the activation process.

[0025] The flue gas generated by the activation section is mixed with the flue gas from the carbonization section along the flue gas channel from bottom to top and then discharged from the coke oven, and sequentially enters the combustion furnace, the steam generator and the chimney.

[0026] The active coke obtained by the activation section is cooled and discharged from the coke oven.

[0027] In some embodiments of the present application, the initial temperature of the mixed gas of the flue gas and the water vapor entering the activation section is 750-900℃.

[0028] The beneficial effects brought by the smoke recirculation coke oven of the embodiment of the present application are as follows:

[0029] (1) The carbonization and activation integrated furnace has small equipment footprint and large output.

[0030] The carbonization and activation integrated furnace has small equipment footprint and large output.

[0031] (2) The problem of coke tar blockage in the carbonization section is avoided.

[0032] The high-temperature smoke gas recirculation is used in the carbonization section, so that the high-temperature smoke gas passes through the active coke layer in the gradually heated material channel, and the coke tar generated by carbonization and heating is gasified in situ and directly enters the smoke gas channel to supplement oxygen combustion under high temperature and gasification, thereby solving the problem of coke tar in the carbonization process from the source, and the problems of coke and dirt deposition on the furnace wall, blockage of the gas channel, and material agglomeration are avoided.

[0033] (3) The activation steam penetrates the material layer in the material channel, and the activation time is short and the effect is good.

[0034] In each material layer, the activation steam enters from the smoke gas recirculation channel in the middle of the material channel and is discharged from the smoke gas sub-channels on both sides of the smoke gas recirculation channel, and the steam enters the material layer from the side close to the smoke gas recirculation channel and is discharged from the side away from the smoke gas recirculation channel, so that the steam and the active coke material layer are penetrated and activated, the contact is more sufficient, and high-efficiency activation in a short time can be achieved.

[0035] (4) The activation steam temperature is adjustable, and the activation components are adjustable

[0036] The water vapor is mixed with the high-temperature smoke gas from the first smoke gas outlet of the coke oven, and the activation temperature of the water vapor is highly adjustable, and the CO2 in the smoke gas is added to the activation components, so that the water vapor and CO2 participate in the activation process at the same time, the activation components are adjustable, and the activation effect is good.

[0037] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0039] Figure 1is a front view of a simple structure schematic diagram of a smoke recirculation coke oven according to an embodiment of the present application.

[0040] Figure 2 is Figure 1 is a partial enlarged view of the position of the smoke sub-passage in the coke oven.

[0041] Figure 3 is a top view of a simple structure schematic diagram of a smoke recirculation coke oven according to an embodiment of the present application.

[0042] Figure 4 is a simple structure schematic diagram of a coke making system according to an embodiment of the present application.

[0043] Figure 5 is a comparison diagram of contact activation and penetration activation principles, wherein (a) is the principle of traditional contact activation, and (b) is the principle of penetration activation of the present application.

[0044] Reference signs:

[0045] 1 - coke oven; 2 - upper sealing section; 3 - air make-up pipe; 4 - pyrolysis gas passage; 5 - middle sealing section; 6 - smoke sub-passage; 7 - lower sealing section; 8 - coke carbonization section smoke recirculation pipeline; 9 - coke carbonization section smoke recirculation fan; 10 - combustion furnace; 11 - air make-up pipe bundle; 12 - activation section smoke recirculation fan; 13 - steam generator; 14 - chimney; 15 - activation section smoke recirculation pipeline; 16 - feed water pump; 17 - cooling pipeline; 18 - cooling circulation pump; 19 - activation gas passage; 20 - smoke passage; 21 - material channel; 22 - smoke recirculation passage; 23 - coke carbonization section smoke recirculation passage; 24 - activation section smoke recirculation passage; 25 - flue; 100 - coke carbonization section; 200 - activation section; 300 - cooling section; 400 - feed inlet; 500 - active coke outlet; 600 - first smoke outlet. DETAILED DESCRIPTION

[0046] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0047] The smoke recirculation coke oven, the coke making system and the method for preparing active coke of the embodiments of the present application are described below in combination with the accompanying drawings.

[0048] Figure 1 is a front view of a simple structure schematic diagram of a smoke recirculation coke oven according to an embodiment of the present application.

[0049] As Figure 1As shown, the smoke recirculation coke oven of the embodiment of the present application comprises an oven body; the oven body is sequentially provided with a carbonization section 100, an activation section 200 and a cooling section 300 from top to bottom and in communication with each other; the oven body is provided with a plurality of material channels 21 at the part of the carbonization section 100 and the activation section 200; the plurality of material channels 21 are arranged at intervals, and the periphery of the plurality of material channels 21 is a smoke passage 20; the material channel 21 is provided with a smoke recirculation passage 22, and the smoke recirculation passage 22 is communicated with a smoke recirculation pipeline; the top, middle and bottom of the smoke recirculation passage 22 are provided with sealing sections, and a plurality of smoke sub-passages 6 are arranged between adjacent two sealing sections; the smoke sub-passage 6 is communicated with the smoke recirculation passage 22 and the material layer 21; the material channel 21 is provided with a plurality of pyrolysis gas passages 4 and a plurality of activation gas passages 19, the plurality of pyrolysis gas passages 4 are located in the carbonization section 100, and the plurality of activation gas passages 19 are located in the activation section 200; the pyrolysis gas passage 4 and the activation gas passage 19 are both communicated with the material channel 21 and the smoke passage 20; the smoke passage 20 is provided with an air combustion supplement pipe 3, which can burn the tar, volatile matter and the like generated in the carbonization process in the smoke passage with the supplemented air, thereby supplementing the heat for carbonization, and the water gas generated in the activation process enters the smoke passage and burns with the supplemented air, thereby supplementing the heat required in the activation process.

[0050] The smoke recirculation coke oven of the embodiment of the present application improves the temperature of the smoke carrying tar by setting the high-temperature smoke recirculation of the carbonization section, so that the tar is gasified in situ, and the risk of tar mixing with fine powder material to coking and fouling is significantly reduced.

[0051] Optionally, the oven body is provided with a feeding port 400 at the top, an active coke outlet 500 at the bottom, and a first smoke outlet 600, a circulating smoke inlet and a mixed gas inlet on the side wall, wherein: the first smoke outlet 600 and the circulating smoke inlet are located in the carbonization section, and the first smoke outlet 600 is located at the upper end of the carbonization section, the first smoke outlet 600 is located above the circulating smoke inlet, the first smoke outlet 600 is communicated with the smoke passage 20, and the first smoke outlet 600 is further communicated with the circulating smoke inlet and the mixed gas inlet through a smoke circulation pipeline; the mixed gas inlet is arranged in the activation section, such as the middle part of the activation section.

[0052] It should be noted that in the embodiment of the present application, the circulating smoke in the smoke circulation pipeline can be smoke from the above-mentioned first smoke outlet, or other smoke, such as power plant smoke, but no matter which case, the smoke does not contain oxygen, so that the active coke loss is not caused, and the volatile matter and water gas are not burned, thereby ensuring the safe operation of the coke oven.

[0053] As a possible example, as Figure 3As shown, the plurality of material layers 21 can be a plurality of tubular passages arranged at intervals in the furnace body. The shape of the material layers can be regular shapes such as a cylinder or a cuboid, or can be irregular shapes such as a wave shape, etc. The material of the side walls of the plurality of material layers can be silicon carbide plates or silicon carbide bricks, etc. The areas between the plurality of material layers and the areas between the plurality of material layers and the inner wall of the furnace body constitute flue gas passages. The top of each of the plurality of material layers is in communication with the feed inlet on the furnace body, and the bottom of each of the plurality of material layers is in communication with the cooling section 300, which is in communication with the active coke outlet. The cooling section 300 is provided with a cooling pipeline 17. The top part of the flue gas passage in communication with the feed inlet is sealed and installed with a first partition plate by welding or the like, and the bottom part of the flue gas passage in communication with the cooling section is sealed and installed with a second partition plate by welding or the like.

[0054] Optionally, the shape of the flue gas recirculation passage can be the same as or different from that of the material layer, and the structure thereof can be a regular cuboid tube, a cylindrical tube, etc., or can be an irregular wave sandwich structure, etc. The arrangement structure of the flue gas recirculation passage in the material layer is not limited: as one possible example, the front side and the rear side of the flue gas recirculation passage are respectively sealed and fixedly connected to the front wall and the rear wall of the material layer by welding, bolt sealing pads, etc., and the left side and the right side are respectively spaced apart from the left side wall and the right side wall of the material layer; as another possible example, the flue gas recirculation passage is integrally formed in the material layer, and shares the front wall and the rear wall, and the left side and the right side are respectively spaced apart from the left side wall and the right side wall of the material layer; as yet another possible example, the flue gas recirculation passage is arranged in the material layer, and the outer surface thereof is spaced apart from the peripheral wall of the material layer. On the basis of the above three cases, the flue gas recirculation passage can be arranged at the middle of the material layer or close to one side, and can be arranged parallel to or at an angle to the material layer. In order to ensure that the gas in the flue gas recirculation passage can uniformly pass through the material layer, generally, the flue gas recirculation passage is arranged at the middle of the material layer and is arranged parallel to the material layer (as shown). Figure 1

[0055] ​Optionally, the flue gas recirculation channel 22 is located in the part of the flue gas recirculation pipeline in the carbonization section 100, and the flue gas recirculation channel 22 is located in the part of the flue gas recirculation pipeline and the steam pipeline in the activation section 200. The part of the flue gas recirculation channel 22 in the carbonization section 100 is defined as the carbonization section flue gas recirculation channel 23, and the part of the flue gas recirculation channel 22 in the activation section 200 is defined as the activation section flue gas recirculation channel 24. As a possible example, in the carbonization section, the flue gas recirculation pipeline is connected to each carbonization section flue gas recirculation channel 23 through the carbonization section flue gas recirculation pipeline 8; in the activation section, the flue gas recirculation pipeline and the steam pipeline are both connected to the mixed gas inlet, and the mixed gas inlet is connected to each activation section flue gas recirculation channel 24 through the activation section flue gas recirculation pipeline 15. Specifically, the carbonization section flue gas recirculation pipeline 8 and the activation section flue gas recirculation pipeline 15 pass through the first mounting hole provided on each flue gas recirculation channel 22, and the corresponding position inside each flue gas recirculation channel 22 is provided with a gas jet pipe or a gas jet head.

[0056] Optionally, the sealing section at the top of the flue gas recirculation channel 22 is the upper sealing section 2, the sealing section in the middle is the middle sealing section 5, and the sealing section at the bottom is the lower sealing section 7; the upper sealing section 2 is located at the top of the carbonization section 100, the middle sealing section 5 is located between the carbonization section 100 and the activation section 200, and the lower sealing section 7 is located at the bottom of the activation section 200. The sealing section is sealed in the flue gas recirculation channel from the top, bottom, left, right, front and back, and does not allow flue gas to pass through. The sealing section can be made of refractory bricks or silicon carbide plates. As a possible example, the height of the upper sealing section 2, the middle sealing section 5 and the lower sealing section 7 is 2-5 times the internal width of the material channel 2. During the preparation of the activated coke, the raw coal particles enter the material channel for carbonization and activation, and form a material layer (referred to as a material layer) in the material channel. When the material layer fills the entire material channel in the horizontal direction, the height of the upper sealing section 2, the middle sealing section 5 and the lower sealing section 7 can also be understood as 2-5 times the thickness of the material layer. The height is set to effectively prevent the short circuiting of flue gas.

[0057] As Figure 1 and Figure 2As shown, several flue gas sub-paths 6 are arranged on the side walls of the flue gas recirculation channel 22 in intervals from top to bottom. As a possible example, when the flue gas recirculation channel is square in cross section, several flue gas sub-paths 6 are arranged on the opposite two side walls of the flue gas recirculation channel 22 in intervals from top to bottom. Optionally, the several flue gas sub-paths 6 can be arranged uniformly or non-uniformly, and can be arranged in the flue gas recirculation channel between the adjacent two sealing sections or only in a part thereof. However, it is understood that the more uniform the arrangement of the several flue gas sub-paths and the longer the pipe section of the flue gas recirculation channel, the more conducive to distributing the gas in the flue gas recirculation channel to the material layer and expanding the contact area between the gas in the flue gas recirculation channel and the material in the material layer.

[0058] Optionally, the flue gas recirculation channel is provided with a second mounting hole at a position corresponding to each flue gas sub-path; in some embodiments, the flue gas sub-path is inserted into the second mounting hole corresponding thereto and is fixedly connected to the inner wall of the second mounting hole by welding, adhesive bonding or the like; in other embodiments, the end of the flue gas sub-path is fixedly connected to the outer edge of the second mounting hole corresponding thereto by welding, adhesive bonding or the like.

[0059] Optionally, the structure of the flue gas sub-path is not limited as long as it can make the gas in the flue gas recirculation channel flow to the material layer. As a possible example, the flue gas sub-path 6 adopts a ring-shaped heat-resistant structure with an acute angle to the horizontal plane. Here, the acute angle to the horizontal plane can be understood as being inclined downward from the side wall of the flue gas recirculation channel to the side away from the flue gas recirculation channel. In this way, the flue gas sub-path 6 is consistent with the falling direction of the material in the material layer, which can not only meet the demand that the gas flows from the flue gas recirculation channel to the corresponding material layer, but also ensure the smooth falling of the material. It should be noted that the flue gas sub-path 6 is to ensure that the gas in the flue gas recirculation channel can flow to the material layer, i.e., gas flow, so its length extending into the corresponding material layer should be appropriate so as not to affect the falling of the material in the material layer.

[0060] Optionally, the plurality of pyrolysis gas passages 4 and the plurality of activation gas passages 19 are arranged in a staggered manner on the side walls of the material layer 21 from top to bottom. The pyrolysis gas passages 4 and the activation gas passages 19 can be square or circular through holes arranged on the material layer. As a possible example, when the cross section of the material layer is square, the plurality of pyrolysis gas passages 4 and the plurality of activation gas passages 19 are arranged in a staggered manner on the opposite two side walls of the material layer 21 from top to bottom. It should be noted that, in some embodiments, the flue gas recirculation sub-passage shares the front side and the rear side with the material layer, and the plurality of pyrolysis gas passages 4 and the plurality of activation gas passages 19 are arranged adjacent to the corresponding flue gas sub-passage. In other embodiments, the plurality of pyrolysis gas passages 4 and the plurality of activation gas passages 19 are not necessarily arranged adjacent to the corresponding flue gas sub-passage, for example, the flue gas recirculation sub-passage is arranged in the material layer and is spaced apart from the peripheral wall of the material layer. The staggered arrangement does not necessarily ensure that the gas flow paths through the pyrolysis gas passages or the activation gas passages do not overlap, so that the gas flowing out of the flue gas recirculation passage flows in one direction through the flue gas sub-passage, the material layer, the pyrolysis gas passage or the activation gas passage, and then to the flue gas passage.

[0061] As a possible example, the air combustion supplement pipe is vertically arranged in the flue gas passage from top to bottom, and the top extends to the bottom of the upper sealing section, and the bottom extends to the position where the lower sealing section is located. As another possible embodiment, in order to burn more fully and quickly, the air combustion supplement pipe is arranged in the region between the material layer and the inner wall of the furnace body, and in the region between adjacent two material layers. In use, all the air combustion supplement pipes are connected to the air source outside the furnace body through pipelines and the like.

[0062] It should be noted that the air combustion supplement pipe can adopt the structure of the existing ammonia injection grid, and air is uniformly injected into the flue gas passage.

[0063] The operation method of the flue gas recirculation coke oven according to the embodiment of the present application is as follows:

[0064] The raw coal particles pass through the carbonization section 100, the activation section 200 and the cooling section 300 of the coke oven 1 from top to bottom, and the finished active coke is discharged from the bottom of the coke oven. The high-temperature flue gas passes through the carbonization section flue gas recirculation passage 23, first passes through the carbonization section flue gas sub-passage 6, and then penetrates the material layer in the material channel 21 (for example, the material layer in the material channel 21 is a coke bed). Figure 5As shown in (b), the tar and volatiles produced by carbonization are carried into the flue gas channel 20 through the pyrolysis gas channel 4. In the flue gas channel 20, they are burned with the supplemented air. The heat of the carbonization section material layer comes from the high-temperature circulating flue gas and the high-temperature flue gas burned in the flue gas channel. The water vapor is mixed with the high-temperature recirculated flue gas from the first flue gas outlet 600 and enters the activation section flue gas recirculation channel 24. It first passes through the activation section flue gas sub-channel 6, then penetrates the material layer in the material channel 21, and then enters the flue gas channel 20 through the activation gas channel 19, carrying the water gas produced by activation. In the flue gas channel 20, the water gas is burned with the supplemented air to supplement the heat required for the activation process. The flue gas is discharged from the first flue gas outlet 600 at the top of the coke oven after mixing with the flue gas produced in the carbonization section along the flue gas channel 20 from bottom to top.

[0065] like Figure 4 As shown, the coking system of this embodiment includes a flue gas recirculation coking oven, a combustion furnace 10, and a steam generator 13. The first flue gas outlet 600 of the flue gas recirculation coking oven is connected to a flue 25, which is connected to a first pipeline, a second pipeline, and the gas inlet of the combustion furnace 10. The first pipeline is connected to the portion of the flue gas recirculation channel 22 located in the carbonization section 100, and the second pipeline is connected to the portion of the flue gas recirculation channel 22 located in the activation section 200. The combustion furnace 10 is provided with an air supplementary combustion tube bundle 11, and the flue gas outlet of the combustion furnace 10 is connected to the flue gas inlet of the steam generator 13. The steam outlet of the steam generator 13 is connected to the second pipeline, and the flue gas outlet of the steam generator 13 is connected to the chimney 14. The refrigerant inlet of the steam generator 11 is connected to the feedwater pump 16.

[0066] As one possible example, the first pipeline connects to the portion of the flue gas recirculation channel 22 located in the carbonization section 100 (i.e., the carbonization section flue gas recirculation channel 23) via the carbonization section flue gas recirculation pipeline 8, and the second pipeline connects to the portion of the flue gas recirculation channel 22 located in the activation section 200 (i.e., the activation section flue gas recirculation channel 24) via the activation section flue gas recirculation pipeline 15. Optionally, in some embodiments, a carbonization section flue gas recirculation fan 9 can be installed on the first pipeline, with its inlet connected to the flue duct 25 and its outlet connected to the inlet of the carbonization section flue gas recirculation pipeline 8; an activation section flue gas recirculation fan 12 can be installed on the second pipeline, with its inlet connected to the flue duct 25 and its outlet connected to the inlet of the activation section flue gas recirculation pipeline 15.

[0067] As a possible example, the inlet of the cooling pipe 17 in the coke oven cooling section is connected to the outlet of the cooling circulation pump 18 via a pipeline.

[0068] Optionally, the air-fuel combustion tube bundle 11 is an air nozzle capable of injecting air into the combustion furnace, and can be connected to external air during use. As a possible example, the air-fuel combustion tube bundle 11 is located in the middle of the combustion furnace 10.

[0069] The operation method of the coking system in this embodiment of the invention is as follows:

[0070] like Figure 4 As shown, raw coal particles pass through the carbonization section 100, activation section 200, and cooling section 300 of the coking oven 1 from top to bottom, and the finished activated coke is discharged from the bottom of the coking oven; high-temperature flue gas passes through the carbonization section flue gas recirculation channel 23, first through the carbonization section flue gas sub-channel 6, then through the material layer in the material channel 21, and then through the pyrolysis gas channel 4, carrying the tar, volatiles, etc. produced by carbonization into the flue gas channel 20, where it is burned with the supplemented air. The heat of the carbonization section material layer comes from the high-temperature circulating flue gas and the high-temperature flue gas burned in the flue gas channel; process water is pressurized by the feed water pump 16 and then enters the flue gas channel 20. Steam generator 13 vaporizes the gas, which then mixes with flue gas from the second pipeline and enters the activation section flue gas recirculation channel 24. It first passes through the activation section flue gas sub-channel 6, then penetrates the material layer in the feed duct 21, and then passes through the activation gas channel 19, carrying the activated water gas into the flue gas channel 20. In the flue gas channel 20, the water gas burns with supplementary air to replenish the heat required for the activation process. The flue gas flows from bottom to top along the flue gas channel 20, mixes with the flue gas generated in the carbonization section, and is discharged from the first flue gas outlet 600 at the top of the coke oven. It then sequentially enters the combustion furnace 10, steam generator 13, and chimney 14 for emission. Throughout the operation, the temperature of the gas mixed with steam can be adjusted between 750-900℃ by controlling the amount of recirculated flue gas in the activation section. Simultaneously, both the carbonization section recirculated flue gas and the activation section recirculated flue gas originate from the flue before the combustion furnace. The flue gas contains no oxygen, thus preventing the loss of activated coke and the combustion of volatiles and water gas, ensuring the safe operation of the coke oven.

[0071] like Figure 4 As shown, the activated carbon method of this embodiment of the invention includes:

[0072] Raw coal particles enter the coking oven and undergo carbonization. At the same time, flue gas from the first pipeline exchanges heat with the raw coal particles in the carbonization section 100 and then passes through the flue gas sub-channel 6 of the carbonization section 100, the material layer in the material channel 2, and the pyrolysis gas channel 4 in sequence. It carries the tar and volatiles produced by carbonization into the flue gas channel 20, where it burns with the supplemented air to provide heat for the carbonization process.

[0073] The process water is pressurized by the feed water pump 16, enters the steam generator 13 for gasification, and then is mixed with the flue gas from the second pipeline to enter the activation section 200 to react with the material from the carbonization section 100 to generate activation water gas, and then the mixed gas of flue gas and water vapor passes through the flue gas sub-channel 6 of the activation section 200, the material layer in the material channel 2 and the activation gas channel 19 in sequence, carries the activation generated water gas into the flue gas channel 20, and the water gas is combusted with the supplemented air in the flue gas channel 20 to provide supplemental heat for the activation process.

[0074] The flue gas generated by the activation section 200 is mixed with the flue gas of the carbonization section 100 from the bottom to the top along the flue gas channel 20, and then is discharged from the coke oven, enters the combustion furnace 10, the steam generator 13 and the chimney 14 in sequence.

[0075] The active coke obtained by the activation section 200 is cooled and discharged from the coke oven.

[0076] As a possible example, the initial temperature of the mixed gas of flue gas and water vapor entering the activation section 200 is 750-900 DEG C.

[0077] In summary, in view of the two core difficulties of the vertical one-step carbonization and activation coke oven, (1) the tar and fine powder mixed during the gradual temperature rising of the raw coal particles in the carbonization section, resulting in coking and fouling of the carbonization section wall, blockage of the gas passage, and material sticking together; (2) whether the activation gas is fully contacted with the active coke, the present application proposes a flue gas recirculation coke oven and a system and method thereof, by setting the high-temperature flue gas recirculation in the carbonization section of the coke oven, the temperature of the flue gas carrying the tar is increased, so that the tar is gasified in situ, which significantly reduces the risk of coking and fouling of the tar and fine powder mixture; by setting the recirculation of the mixed water vapor and flue gas, the activation steam temperature is increased, and the activation effect is improved.

[0078] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0079] In addition, the terms "first", "second", etc. are used only to describe different instances, and are not used to indicate or imply relative importance or a number of indications of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0080] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0081] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0082] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0083] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A flue gas recirculation coking oven, characterized in that, The furnace includes a furnace body; the furnace body is provided with a carbonization section, an activation section and a cooling section connected to each other from top to bottom; the portion of the furnace body located in the carbonization section and the activation section is provided with several material channels; the material channels are spaced apart, and the periphery of the material channels is a flue gas channel; The material channel is equipped with a flue gas recirculation channel, which is connected to a flue gas recirculation pipeline. The flue gas recirculation channel has sealing sections at its top, middle, and bottom, and several flue gas sub-channels are provided between adjacent sealing sections. These sub-channels connect the flue gas recirculation channel and the material layer. The material channel is equipped with several pyrolysis gas channels and several activation gas channels, with the pyrolysis gas channels located in the carbonization section and the activation gas channels located in the activation section. Both the pyrolysis gas channels and the activation gas channels connect the material channel and the flue gas channel. An air supplementary combustion pipe is provided in the flue gas passage; the air supplementary combustion pipe is vertically installed in the flue gas passage from top to bottom, and the air supplementary combustion pipe is evenly distributed in the area between the material channel and the inner wall of the furnace body, and in the area between two adjacent material channels. The portion of the flue gas recirculation channel located in the carbonization section is connected to the flue gas recirculation pipeline, and the portion of the flue gas recirculation channel located in the activation section is connected to the flue gas recirculation pipeline and the steam pipeline. The flue gas recirculation pipeline is connected to the first flue gas outlet; the first flue gas outlet is located on the side wall of the furnace body and is located in the carbonization section.

2. The coking oven with flue gas recirculation according to claim 1, characterized in that, The sealing section at the top of the flue gas recirculation channel is the upper sealing section, the sealing section in the middle is the middle sealing section, and the sealing section at the bottom is the lower sealing section; the upper sealing section is located at the top of the carbonization section, the middle sealing section is located between the carbonization section and the activation section, and the lower sealing section is located at the bottom of the activation section; the height of the upper sealing section, the middle sealing section, and the lower sealing section is 2-5 times the internal width of the channel.

3. The coking oven with flue gas recirculation according to claim 1, characterized in that, Several flue gas sub-channels are arranged at intervals from top to bottom on the side wall of the flue gas recirculation channel.

4. The coking oven with flue gas recirculation according to claim 1, characterized in that, Several pyrolysis gas channels and several activation gas channels are arranged alternately and intermittently from top to bottom on the sidewall of the material layer.

5. The coking oven with flue gas recirculation according to claim 1, characterized in that, The top of the material layer is connected to the feed inlet at the top of the furnace body, the bottom of the material layer is connected to the cooling section, and the cooling section is connected to the activated coke outlet at the bottom of the furnace body; the cooling section is equipped with cooling pipes.

6. A coking system, characterized in that, Includes the flue gas recirculation coking oven, combustion furnace, and steam generator as described in any one of claims 1 to 5; The first flue gas outlet of the flue gas recirculation coking oven is connected to the flue, the flue is connected to the first pipeline, the second pipeline and the gas inlet of the combustion furnace, the first pipeline is connected to the part of the flue gas recirculation channel located in the carbonization section, and the second pipeline is connected to the part of the flue gas recirculation channel located in the activation section. The combustion furnace is equipped with an air-fuel combustion tube bundle, and the flue gas outlet of the combustion furnace is connected to the flue gas inlet of the steam generator; The steam outlet of the steam generator is connected to the second pipeline, the flue gas outlet of the steam generator is connected to the chimney, and the refrigerant inlet of the steam generator is connected to the water supply pump.

7. A method for preparing activated coke using the coking system of claim 6, characterized in that, include: Raw coal particles enter the coking oven and undergo carbonization. At the same time, flue gas from the first pipeline exchanges heat with the raw coal particles in the carbonization section and then passes through the flue gas sub-channel of the carbonization section, the material layer in the material channel and the pyrolysis gas channel in sequence. It carries the volatiles produced by carbonization into the flue gas channel and burns with the supplemented air in the flue gas channel to supplement the heat for the carbonization process. After being pressurized by the feed water pump, the process water enters the steam generator for gasification. It then mixes with the flue gas from the second pipeline and enters the activation section to react with the material from the carbonization section. Subsequently, the mixture of flue gas and water vapor passes through the flue gas sub-channel of the activation section, the material layer in the material channel, and the activation gas channel in sequence, carrying the water gas generated during activation into the flue gas channel. In the flue gas channel, the water gas burns with the supplemented air to provide supplementary heat for the activation process. The flue gas generated in the activation section mixes with the flue gas in the carbonization section from bottom to top along the flue gas passage and is then discharged from the coking oven, and enters the combustion furnace, steam generator and chimney in sequence. The activated coke obtained in the activation stage is cooled and discharged from the coking oven.

8. The method according to claim 7, characterized in that, The initial temperature of the mixture of flue gas and water vapor entering the activation section is 750-900℃.

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