A carbonization-activated flue gas double-cycle coke oven system and method

Abstract

The present invention discloses a carbonization and activation flue gas double-cycle coke oven system and method. The carbonization and activation flue gas double-cycle coke oven system includes a coke oven, a waste heat boiler, and a purification unit. The coke oven includes a furnace body, in which a carbonization section and an activation section are successively arranged from top to bottom. The carbonization section and the activation section are communicated through a plurality of spaced-apart material channels; the area outside the plurality of material channels forms a flue, the top and bottom of the flue are both closed, a sealing section is arranged at the part of the flue between the carbonization section and the activation section, the carbonization section is provided with a carbonization section flue gas outlet, a carbonization section gas inlet, and a pyrolysis gas extraction pipe, and the activation section is provided with an activation section flue gas outlet and an activation gas inlet. The carbonization and activation flue gas double-cycle coke oven system of the present invention has accurate temperature control, high coke-making quality, high activation gas temperature, shortened activation time, good activation effect, reasonable heat utilization, low energy consumption, low coke-making cost, and can timely discharge tar to prevent blockage and scaling.

Description

Technical Field

[0001] The present invention belongs to the technical field of material preparation, and particularly relates to a carbonization activation flue gas double-cycle coke oven system and method. Background Art

[0002] Coal is both a fuel and a low-cost and easily available raw material for preparing carbon materials. Currently, the activated coke used for desulfurization and denitrification is prepared from coal. The existing carbonization activation equipment for preparing activated coke is a horizontal rotary kiln and a vertical Slep furnace, among which:

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

[0004] The activation steam of the vertical Slep furnace is generated by switching the regenerator bricks in the left and right combustion chambers, and the process is complex and the steam temperature is uncontrollable; the vertical Slep furnace can only activate the carbonized material. This is because during the heating process of the carbonized raw material, there are less tar, volatile components, and fine crushed powder, and it is not easy to have problems such as coking and scaling on the furnace wall, blockage of the evolved gas channels, and agglomeration of the material. Therefore, the vertical Slep furnace is only an activation furnace and cannot be used as a carbonization activation furnace for one-step coking of raw coal. It has poor adaptability to raw materials for fixed particles and specific operating parameters.

[0005] In addition, the existing carbonization activation equipment for preparing activated coke mostly relies on external heat sources, resulting in high energy consumption. Summary of the Invention

[0006] In view of this, an object of the present invention is to propose a carbonization activation flue gas double-cycle coke oven system, with double-cycle of flue gas in the carbonization section and the activation section, precise temperature control, high coke-making quality, high activation gas temperature, shortened activation time, good activation effect, reasonable heat utilization, low energy consumption, low coke-making cost, and can timely discharge tar to prevent blockage and scaling.

[0007] Another object of the present invention is to propose a method for preparing activated coke.

[0008] To achieve the above object, a first aspect embodiment of the present invention proposes a carbonization activation flue gas double-cycle coke oven system, including:

[0009] Coking oven, the coking oven includes a furnace body, a carbonization section and an activation section are sequentially arranged in the furnace body from top to bottom, and the carbonization section and the activation section are communicated through a plurality of spaced-apart material channels; the area outside the plurality of material channels forms a flue, the top and bottom of the flue are both closed, and a sealing section is arranged at the part of the flue between the carbonization section and the activation section, the carbonization section is provided with a carbonization section flue gas outlet, a carbonization section gas inlet and a pyrolysis gas extraction pipe, and the activation section is provided with an activation section flue gas outlet and an activation gas inlet;

[0010] Waste heat boiler, the flue gas side inlet of the waste heat boiler is communicated with the carbonization section flue gas outlet and the activation section flue gas outlet, and the steam side outlet and the flue gas outlet of the waste heat boiler are both communicated with the activation gas inlet;

[0011] Purification unit, the inlet of the purification unit is communicated with the outlet of the pyrolysis gas extraction pipe, and the outlet of the purification unit is communicated with the carbonization section gas inlet.

[0012] In some embodiments of the present invention, the carbonization section flue gas outlet, the pyrolysis gas extraction pipe and the carbonization section gas inlet are sequentially arranged from top to bottom.

[0013] In some embodiments of the present invention, one end of the pyrolysis gas extraction pipe extends out of the furnace body, and the other end passes through all the material channels and is communicated with each material channel.

[0014] In some embodiments of the present invention, a carbonization section air supply pipe is arranged at the part of the flue located in the carbonization section, and an activation section air supply pipe is arranged at the part of the flue located in the activation section.

[0015] In some embodiments of the present invention, a plurality of water gas channels and a plurality of activation gas holes are arranged on the side wall of the part of the material channel located in the activation section, the plurality of water gas channels are located above the plurality of activation gas holes, and the plurality of activation gas holes are all communicated with the activation gas inlet.

[0016] In some embodiments of the present invention, the plurality of activation gas holes are communicated with the activation gas inlet through an activation gas grid, and the activation gas grid is arranged at the part of the flue located in the activation section.

[0017] In some embodiments of the present invention, the plurality of water gas channels are divided into two groups and are oppositely arranged on the opposite two side walls of the material channel.

[0018] In some embodiments of the present invention, the water gas channel is arranged obliquely downward from the outside of the material channel to the inside of the material channel, and the inclination angle is between 45-70°.

[0019] In some embodiments of the present invention, the material of the sealing section is refractory brick, and the height of the sealing section is 2-5 times the internal width of the material channel.

[0020] In some embodiments of the present invention, the coke oven further includes a cooling section, which is arranged inside the furnace body; the cooling section is located below the activation section and the two are connected; the cooling section is provided with cooling pipes.

[0021] In some embodiments of the present invention, the flue gas outlet of the activation section is arranged at the bottom of the activation section.

[0022] In some embodiments of the present invention, the purification unit includes a scrubbing tower, an electrostatic tar precipitator, a draft fan, a gas tank, a compressor and a compressed gas tank that are connected in sequence; the inlet of the scrubbing tower is connected to the pyrolysis gas extraction pipe, and the outlet of the compressed gas tank is connected to the gas inlet of the carbonization section.

[0023] In some embodiments of the present invention, the water side inlet of the waste heat boiler is connected to a feed water pump, and the flue gas side outlet of the waste heat boiler is connected to a chimney.

[0024] To achieve the above object, a first aspect embodiment of the present invention proposes a method for preparing activated coke, which is carried out by using the carbonization and activation flue gas double circulation coke oven system of the embodiments of the present invention, and includes

[0025] Coal particles enter the carbonization section channel of the coke oven, undergo a carbonization reaction, and obtain carbonized materials.

[0026] The volatile components and tar precipitated during the carbonization process are discharged and purified through the pyrolysis gas extraction pipe under the action of a draft fan, and are combusted with the air from the air supply pipe of the carbonization section. While providing heat for the carbonization section, the carbonization section flue gas generated enters the waste heat boiler for waste heat utilization, completing the carbonization section flue gas cycle.

[0027] The carbonized materials enter the activation section by their own weight, flow countercurrently with the activation gas, and undergo an activation reaction to obtain activated materials.

[0028] The water gas generated during the activation process enters the activation section flue through the water gas channel, is combusted with the air supply of the activation section air supply pipe. While maintaining the heat of the activation section, the activation section flue gas generated enters the waste heat boiler for waste heat utilization. The steam generated by the waste heat boiler is mixed with a part of the carbonization section flue gas and activation section flue gas after waste heat utilization and enters the activation section as activation gas, completing the activation section flue gas cycle.

[0029] The activated materials are cooled to obtain the product activated coke.

[0030] The carbonization and activation flue gas double circulation coke oven system of the embodiments of the present invention can bring the following beneficial effects:

[0031] (1) Double circulation of the carbonization section and activation section flue gas, precise temperature control, and high coke making quality.

[0032] The carbonization section and the activation section are provided with a double flue gas circulation, which can independently control the heating rate and the final temperature of the carbonization section and the activation section. The temperature control is precise, which is beneficial to realizing coking with optimal parameters and obtaining activated coke with high quality.

[0033] (2) The activation gas has a high temperature, the activation time is shortened, and the activation effect is good.

[0034] Adopt the technical route of directly mixing low-temperature activated steam with part of high-temperature flue gas and then carrying out activation, which ensures that the temperature of the activation atmosphere is high enough, can effectively activate the coke material, and has a good activation effect.

[0035] (3) Tar can be discharged in time to prevent blockage and scaling problems.

[0036] The flue gas system in the carbonization section circulates independently, which can control the tar output. At the same time, the material layer in the carbonization section channel operates under negative pressure, and the tar can be discharged in time without causing blockage and scaling problems.

[0037] (4) The heat is utilized reasonably, the energy consumption is low, and the coking cost is low.

[0038] In the present invention, the high-temperature flue gas heats the carbonization section and the activation section respectively. The tail flue gas first heats the feed water and then directly mixes with the flue gas to heat the steam, realizing the cascade utilization of the flue gas. The heat of the whole system comes from the evolved gas. The heat is utilized reasonably and no external heat source is required, so the coking energy consumption is low and the cost is low.

[0039] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above-mentioned and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0041] Figure 1 is a simple structural diagram of a coking furnace system with a double flue gas circulation for carbonization and activation according to an embodiment of the present invention (also a simple flow chart of a method for preparing activated coke according to an embodiment of the present invention).

[0042] Figure 2 is a sectional view of the channel of the coking furnace in a coking furnace system with a double flue gas circulation for carbonization and activation according to an embodiment of the present invention.

[0043] Reference numerals:

[0044] 1 - Coke oven; 2 - Flue gas outlet of carbonization section; 3 - Scrubbing tower; 4 - Induced draft fan; 5 - Compressor; 6 - Electrostatic tar precipitator; 7 - Gas tank; 8 - Compressed gas tank; 9 - Gas inlet of carbonization section; 10 - Feed water pump; 11 - Chimney; 12 - Cooling pipe; 13 - Flue gas outlet of activation section; 14 - Waste heat boiler; 15 - Feed inlet; 16 - Pyrolysis gas extraction pipe; 17 - Air make-up pipe of carbonization section; 18 - Charge passage; 19 - Sealing section; 20 - Water gas passage; 21 - Air make-up pipe of activation section; 22 - Activated coke outlet; 23 - Activating gas hole; 24 - Activating gas grid; 25 - Flue. Detailed implementation manners

[0045] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0046] The carbonization and activation flue gas double - cycle coke oven system and the preparation method of activated coke according to the embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0047] Figure 1 It is a simple structure diagram of the carbonization and activation flue gas double - cycle coke oven system according to an embodiment of the present invention.

[0048] As Figure 1 shown, the carbonization and activation flue gas double - cycle coke oven system according to the embodiment of the present invention includes a coke oven 1, a waste heat boiler 14 and a purification unit; the coke oven 1 includes a furnace body, and a carbonization section 100 and an activation section 200 are sequentially arranged from top to bottom in the furnace body. The carbonization section 100 and the activation section 200 are connected through a plurality of charge passages 18 arranged at intervals; the areas outside the plurality of charge passages 18 form a flue 25. The top and bottom of the flue 25 are both closed. A sealing section 19 is provided at the part of the flue 25 between the carbonization section 100 and the activation section 200. The carbonization section 100 is provided with a flue gas outlet 2 of the carbonization section, a gas inlet 9 of the carbonization section and a pyrolysis gas extraction pipe 16. The activation section 200 is provided with a flue gas outlet 13 of the activation section and an activating gas inlet; the flue gas side inlet of the waste heat boiler 14 is connected to the flue gas outlet 2 of the carbonization section and the flue gas outlet 13 of the activation section. The steam side outlet and the flue gas outlet of the waste heat boiler 14 are both connected to the activating gas inlet; the inlet of the purification unit is connected to the outlet of the pyrolysis gas extraction pipe 16, and the outlet of the purification unit is connected to the gas inlet 9 of the carbonization section.

[0049] It can be understood that the flue is the gas passage. The flue gas outlet 2 of the carbonization section and the gas inlet 9 of the carbonization section are connected to the part of the flue in the carbonization section (referred to as the carbonization flue), and the flue gas outlet 13 of the activation section is connected to the part of the flue in the activation section (referred to as the activation flue), which facilitates the timely discharge of the flue gas in the carbonization section and the activation section or the entry of gas into the flue. The area outside several charging channels 18 includes the area between adjacent charging channels and the area between several charging channels and the furnace body side wall.

[0050] The carbonization and activation flue gas double - cycle coke oven system of the embodiment of the present invention has the following advantages:

[0051] (1) Double - cycle of flue gas in the carbonization section and the activation section, precise temperature control, and high coke - making quality.

[0052] The carbonization section and the activation section are provided with a double - cycle of flue gas, and the heating rate and the final temperature of the carbonization section and the activation section can be controlled separately. The temperature control is precise, which is beneficial to realizing coke - making with the best parameters and obtaining high - quality activated coke.

[0053] (2) High temperature of the activation gas, shortened activation time, and good activation effect.

[0054] Adopting the technical route of directly mixing low - temperature activation steam with part of the high - temperature flue gas and then carrying out activation ensures that the temperature of the activation atmosphere is high enough, which can effectively activate the coke material and has a good activation effect.

[0055] (3) Tar can be discharged in time to prevent blockage and scaling problems.

[0056] The flue gas system of the carbonization section circulates separately, which can control the tar output. At the same time, the material layer in the charging channel of the carbonization section operates under negative pressure, and the tar can be discharged in time without causing blockage and scaling problems.

[0057] (4) Rational heat utilization, low energy consumption, and low coke - making cost.

[0058] The high - temperature flue gas of the present invention heats the carbonization section and the activation section respectively. The tail flue gas first heats the feed water and then directly mixes with the flue gas to heat the steam, realizing the cascade utilization of the flue gas. The heat of the whole system comes from the evolved gas, the heat utilization is reasonable, no external heat source is required, and the coke - making energy consumption and cost are low.

[0059] In the present invention, the shape of the furnace body is not limited. The main part with a carbonization section, an activation section, etc. can be a cylinder, a cuboid, a cube, a prism, etc. As a possible example, as Figure 1 and Figure 2 shown, the main part of the furnace body is cuboid - shaped, and a pyramidal feed inlet 15 is integrally formed or welded at the top, and a pyramidal activated coke outlet 22 with a large top and a small bottom is integrally formed or welded at the bottom.

[0060] In some embodiments, one end of the pyrolysis gas extraction pipe 6 extends out of the furnace body through the mounting hole on the furnace body and is fixedly installed and sealed with the furnace body through a sealing ring or the like, and the other end passes through all the channels and communicates with each channel. It can be understood that since several channels are arranged at intervals, and there is a flue gas area outside several channels, when the pyrolysis gas extraction pipe 6 passes through the channels, it will also pass through the flue gas part between two adjacent channels. Optionally, as a possible example, mounting holes for the pyrolysis gas extraction pipe to pass through are provided on the side walls of each channel, and the pyrolysis gas extraction pipe is fixedly connected and sealed with each channel by welding or the like. The end of the pyrolysis gas extraction pipe far from the pyrolysis gas outlet can be closed. In order to ensure that the evolved gas in each channel can be smoothly extracted, at least one evolved gas hole can be opened in the pipe section of the pyrolysis gas extraction pipe extending into each channel, or an evolved gas pipe can also be installed at these evolved gas holes.

[0061] In some embodiments, the pyrolysis gas extraction pipe 6 can be a single independent pipeline; in other embodiments, in order to improve the extraction efficiency of the evolved gas, the pyrolysis gas extraction pipe 6 can also be an integral main pipeline composed of multiple grid-shaped pipelines, in the form of being connected to the outside through one pipeline, provided that these grid-shaped pipelines do not affect the normal falling of the materials in the channels.

[0062] In some embodiments, in order to burn the evolved gas in the carbonization section and the water gas in the activation section, a carbonization section air supply pipe 17 is provided at the part of the flue gas in the carbonization section, and an activation section air supply pipe 21 is provided at the part of the flue gas in the activation section. They can respectively supply air to the carbonization section flue gas and the activation section flue gas for combustion support.

[0063] In some embodiments, the carbonization section flue gas outlet 2, the pyrolysis gas extraction pipe 16, and the carbonization section gas inlet 9 are arranged in sequence from top to bottom, wherein the carbonization section flue gas outlet 2 and the carbonization section gas inlet 9 are arranged on the side wall of the furnace body. As a possible example, the carbonization section flue gas outlet 2 is arranged at the top of the carbonization section, and the carbonization section gas inlet 9 is arranged at the bottom of the carbonization section, which can facilitate the volatiles and tar evolved during the heating process of the materials in the carbonization section to re-enter the carbonization section flue gas from bottom to top for full combustion after purification, and discharge from the carbonization section after providing heat for the carbonization section.

[0064] In some embodiments, a plurality of water-gas channels 20 and a plurality of activation gas holes 23 are provided on the side wall of the part of the material channel 18 located in the activation section 100. The plurality of water-gas channels 20 are located above the plurality of activation gas holes 23, and the plurality of activation gas holes 23 are all communicated with the activation gas inlet. By arranging the water-gas channels above the activation gas holes, the activation gas can contact and activate the material falling from the carbonization section countercurrently from bottom to top. The generated water gas and the unreacted activation gas can enter the flue of the activation section from bottom to top through the water-gas channels, and burn under the air supplemented by the air supplement pipe 21 in the activation section, supplementing heat for the activation section and heating the unreacted activation gas to maintain the temperature of the activation section.

[0065] In some embodiments, the plurality of water-gas channels 20 are divided into two groups and are oppositely arranged on two opposite side walls of the material channel 18. As a possible example, the plurality of water-gas channels 20 and the plurality of activation gas holes 23 can both be a plurality of through holes arrayed on the side wall of the material channel.

[0066] In the same longitudinal section, along the height direction of the furnace body on a single side wall of each material channel, the number of water-gas channels arranged should not be too many, generally 1-2. Setting too many will affect the setting of the activation gas holes, and thus affect the uniform distribution of the activation gas in the material channel. At the same time, the closer the water-gas channel is to the top of the activation section, the better, which can reserve more positions for the activation gas holes; while the number of activation gas holes 23 can be set more, such as 4-10, and they are evenly distributed from the bottom of the activation section to the lower end of the water-gas channel, ensuring that there is enough and evenly distributed activation gas in the material layer of each material channel in the activation section.

[0067] In some embodiments, the water-gas channel 20 is arranged to incline from the outside of the material channel to the inside and downward, and the inclination angle is between 45-70°, preferably 50-60°. The activation gas hole 23 can adopt the same arrangement method and inclination angle as the water-gas channel 20, or can be arranged horizontally (as Figure 1 shown).

[0068] As a possible example, at the position of the top of the activation section on two opposite side walls of the material channel, 1 row of water-gas channels 20 (10 in number) are arranged at intervals and evenly distributed, inclining 58° from the outside of the material channel to the inside and downward.

[0069] It should be noted that in the present invention, the manner in which the plurality of activation gas holes 23 are communicated with the activation gas inlet is not limited. As a possible example, the plurality of activation gas holes 23 are communicated with the activation gas inlet through an activation gas grid 24, and the activation gas grid 24 is arranged in the part of the flue located in the activation section. The structure of the activation gas grid is the same as the existing ammonia injection grid structure, except that the injected gas changes from ammonia to air, and its specific structure will not be elaborated here.

[0070] In some embodiments, the sealing section is made of refractory bricks to seal the flue, dividing the flue into a carbonization section flue and an activation section flue, which facilitates the flue gas circulation in the carbonization section and the activation section. The height of the sealing section is 2-5 times, preferably 3 times or 4 times, the internal width of the material channel (as shown in Figure 1 the horizontal length).

[0071] In some embodiments, in order to directly cool the materials obtained in the activation section without transfer, the coke oven further includes a cooling section 300, which is arranged inside the furnace body; the cooling section 300 is located below the activation section and the two are connected; the cooling section 300 is provided with cooling pipes 12. The cooling pipes can be in the form of coiled pipes, with both ends extending out of the furnace body. One end is connected to a circulating cooling medium such as cold water, and the other end can be connected to a heat exchange device to recover and utilize the heat.

[0072] In some embodiments, the activation section flue gas outlet 13 is arranged at the bottom of the activation section, so that the water gas generated by activation flows out from the water gas channel, and is combusted with the air from the activation section air supply pipe from top to bottom in the activation flue, and after sufficient combustion, it provides heat for the activation section and heats the unreacted activation gas.

[0073] In some embodiments, the purification unit includes a scrubbing tower 3, an electrostatic tar precipitator 6, an induced draft fan 4, a gas tank 7, a compressor 5 and a compressed gas tank 8 connected in sequence through pipelines; the inlet of the scrubbing tower 3 is connected to the pyrolysis gas extraction pipe 16, and the outlet of the compressed gas tank 8 is connected to the carbonization section gas inlet 9. The evolved gas containing volatile components and tar generated in the carbonization section can remove tar through the purification unit.

[0074] In some embodiments, the water side inlet of the waste heat boiler 14 is connected to the feed water pump 10 through a pipeline, and the flue gas side outlet of the waste heat boiler 14 is connected to the chimney 11, realizing the waste heat utilization of the carbonization section flue gas and the activation section flue gas.

[0075] The operation method of the carbonization and activation flue gas double circulation coke oven system according to the embodiment of the present invention is as follows:

[0076] The raw coal particles first enter the carbonization section material channel of the coke oven 1, slowly fall by their own weight, pass through the activation section 200 and the cooling section 300 in sequence, and are discharged from the bottom of the coke oven 1;

[0077] During the heating process of the materials in the carbonization section of the coke oven 1, volatile components and tar are released. By relying on the induced draft fan 4, a negative pressure is generated inside the material layer in the carbonization section (the negative pressure is generally between (-50) - (-200) Pa, preferably (-80) - (-150) Pa, and more preferably -100 Pa). It is discharged from the pyrolysis gas extraction pipe 16 provided in the middle of the carbonization section. After being cooled and purified, the pyrolysis gas is stored in the compressed gas tank 8. The gas in the compressed gas tank 8 enters from the gas inlet 9 of the carbonization section of the coke oven and is combusted with the air from the air supply pipe 17 in the carbonization section. The flue gas goes from bottom to top and is discharged from the flue gas outlet 2 of the carbonization section of the coke oven, and then enters the waste heat boiler 14 for waste heat utilization, completing the flue gas circulation in the carbonization section.

[0078] The flue gas in the carbonization section and the flue gas in the activation section both enter the waste heat boiler 14 for full combustion. A part of the generated high-temperature flue gas is directly mixed with low-temperature water vapor. The mixed activation gas enters the material layer in the activation section channel through the activation gas grid 24. The mixed gas goes upward along the gaps between the material particles in the material layer, and the material particles move slowly downward. The two flow countercurrently for activation. Finally, the water gas generated by activation and the unreacted activation gas are discharged from the water gas channel 20 in the activation section, enter the flue gas channel in the activation section from top to bottom. An air supply pipe 21 is provided in the flue gas channel in the activation section, so that the water gas is preliminarily combusted to maintain the heat in the activation section, and finally is discharged from the bottom of the activation section and enters the waste heat boiler 14, completing the flue gas circulation in the activation section.

[0079] The preparation method of the activated coke in the embodiment of the present invention is similar to the operation method of the carbonization and activation flue gas double-cycle coke oven system in the embodiment of the present invention. It is carried out by using the carbonization and activation flue gas double-cycle coke oven system in the embodiment of the present invention, and includes the following steps:

[0080] The raw coal particles enter the carbonization section channel of the coke oven and undergo a carbonization reaction to obtain carbonized materials; the volatile components and tar released during the carbonization process are discharged through the pyrolysis gas extraction pipe under the action of the induced draft fan and are purified by the purification unit, and then are combusted with the air from the air supply pipe in the carbonization section. While providing heat for the carbonization section, the generated flue gas in the carbonization section enters the waste heat boiler for waste heat utilization, completing the flue gas circulation in the carbonization section;

[0081] The carbonized materials enter the activation section by their own weight, flow countercurrently with the activation gas, and undergo an activation reaction to obtain activated materials; the water gas generated during the activation process enters the flue in the activation section through the water gas channel and is combusted with the air supply from the air supply pipe in the activation section. While maintaining the heat in the activation section, the generated flue gas in the activation section enters the waste heat boiler for waste heat utilization. The water vapor generated by the waste heat boiler is mixed with a part of the flue gas in the carbonization section and the flue gas in the activation section after waste heat utilization and then enters the activation section as the activation gas, completing the flue gas circulation in the activation section;

[0082] The activated materials fall into the cooling section by their own weight. After being cooled, the product activated coke is obtained and is discharged and collected through the activated coke outlet.

[0083] In some embodiments of the present invention, after the steam at 400 - 550°C generated by the waste heat boiler is mixed with a part of the flue gas from the carbonization section and the flue gas from the activation section after waste heat utilization (the temperature of the mixed flue gas is 950 - 1200°C), the temperature of the activation gas entering the activation section obtained is between 750 - 850°C, and the volume fraction of steam is 20 - 70%. Preferably, the temperature of the steam generated by the waste heat boiler is between 430 - 520°C, the temperature of the mixed flue gas is between 1000 - 1150°C, the temperature of the activation gas entering the activation section is between 780 - 820°C, and the volume fraction of steam is 40 - 60%. As a possible example, after the 500°C steam generated by the waste heat boiler is mixed with a part of the flue gas from the carbonization section and the flue gas from the activation section (the temperature of the mixed flue gas is 1100°C), the temperature of the activation gas entering the activation section obtained is 800°C, and the volume fraction of steam is 50%.

[0084] In some embodiments of the present invention, while the induced draft fan extracts the volatile components and tar precipitated during the carbonization process through the pyrolysis gas extraction pipe, a negative pressure state is created in the carbonization section material channel. The negative pressure is generally between (-50) - (-200) Pa, preferably (-80) - (-150) Pa, and more preferably -100 Pa.

[0085] The innovation points of the present invention are mainly reflected in:

[0086] Compared with the traditional coke oven, the carbonization and activation flue gas double - cycle coke oven according to the embodiments of the present invention has the following settings:

[0087] (1) Double - cycle of high - temperature flue gas in the carbonization section and the activation section: After the evolved gas generated during the carbonization process is separately collected, it is used to heat the carbonization section and the activation section respectively, and can be separately controlled according to the carbonization temperature - rising characteristics and the activation temperature characteristics. The double - cycle system is beneficial to the preparation of high - quality activated coke.

[0088] (2) Mixing of low - temperature activation steam and high - temperature flue gas to form the activation gas components: The activation temperature is directly related to the quality of the activated coke, and it is difficult to obtain the traditional activation gas components at about 800°C. The present invention adopts the technical idea of mixing high - temperature flue gas and steam to obtain high - temperature activation gas, which can ensure the temperature during the activation process and obtain high - quality activated coke.

[0089] (3) Considering the problem of tar discharge in the carbonization section: The rapid and smooth discharge of tar is the key to the stable and safe operation of the coke oven system. This solution sets the carbonization section of the coke oven to operate under negative pressure and sets up a separate discharge and treatment system, which can effectively prevent tar problems.

[0090] In the description of the present invention, it should be understood that the orientation or positional relationship 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", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0091] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0092] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0094] In the present invention, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0095] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A carbonization and activation flue gas double-cycle coke oven system, characterized in that, it includes: A coke oven, the coke oven includes a furnace body, and a carbonization section and an activation section are sequentially arranged from top to bottom in the furnace body. The carbonization section and the activation section are connected through a plurality of spaced-apart material channels; the area outside the plurality of material channels forms a flue, the top and bottom of the flue are both closed, and a sealing section is provided at the part of the flue between the carbonization section and the activation section. The carbonization section is provided with a carbonization section flue gas outlet, a carbonization section gas inlet, and a pyrolysis gas extraction pipe. The activation section is provided with an activation section flue gas outlet and an activation gas inlet. The carbonization section flue gas outlet, the pyrolysis gas extraction pipe, and the carbonization section gas inlet are sequentially arranged from top to bottom; the activation section flue gas outlet is arranged at the bottom of the activation section, and an activation section air supply pipe is provided at the part of the flue located in the activation section. A plurality of water gas channels and a plurality of activation gas holes are provided on the side wall of the part of the material channel located in the activation section. The plurality of water gas channels are located above the plurality of activation gas holes, and the plurality of activation gas holes are all connected to the activation gas inlet; A waste heat boiler, the flue gas side inlet of the waste heat boiler is connected to the carbonization section flue gas outlet and the activation section flue gas outlet, and the steam side outlet and the flue gas outlet of the waste heat boiler are both connected to the activation gas inlet; A purification unit, the inlet of the purification unit is connected to the outlet of the pyrolysis gas extraction pipe, and the outlet of the purification unit is connected to the carbonization section gas inlet.

2. The carbonization and activation flue gas double-cycle coke oven system according to claim 1, characterized in that, One end of the pyrolysis gas extraction pipe extends out of the furnace body, and the other end passes through all the material channels and is connected to each material channel.

3. The carbonization and activation flue gas double-cycle coke oven system according to claim 1, characterized in that, A carbonization section air supply pipe is provided at the part of the flue located in the carbonization section.

4. The carbonization and activation flue gas double-cycle coke oven system according to claim 1, characterized in that, The plurality of activation gas holes are connected to the activation gas inlet through an activation gas grid, and the activation gas grid is provided at the part of the flue located in the activation section.

5. The carbonization and activation flue gas double-cycle coke oven system according to claim 1, characterized in that, The plurality of water gas channels are divided into two groups and are oppositely arranged on the opposite two side walls of the material channel; The water gas channels are arranged obliquely from the outside to the inside and downward of the material channel, and the inclination angle is between 45-70°.

6. The carbonization and activation flue gas double-cycle coke oven system according to claim 1, characterized in that, The coke oven further includes a cooling section, and the cooling section is arranged in the furnace body; the cooling section is located below the activation section and is connected to the activation section; the cooling section is provided with cooling pipes; The material of the sealing section is refractory bricks, and the height of the sealing section is 2-5 times the internal width of the material channel; The water side inlet of the waste heat boiler is connected to a feed water pump, and the flue gas side outlet of the waste heat boiler is connected to a chimney.

7. The carbonization and activation flue gas double-cycle coke oven system according to claim 1, characterized in that, The purification unit includes a scrubbing tower, an electrostatic tar precipitator, a induced draft fan, a gas tank, a compressor and a compressed gas tank which are connected in sequence; the inlet of the scrubbing tower is connected to the pyrolysis gas extraction pipe, and the outlet of the compressed gas tank is connected to the gas inlet of the carbonization section.

8. A method for preparing activated coke by using the carbonization and activation flue gas double-cycle coke oven system according to any one of claims 1 to 7, characterized in that it includes raw coal particles enter the carbonization section channel of the coke oven, undergo a carbonization reaction, and obtain carbonized materials; the volatile components and tar precipitated during the carbonization process are discharged and purified through the pyrolysis gas extraction pipe under the action of the induced draft fan, and are combusted with the air from the air supply pipe of the carbonization section, generating carbonization section flue gas while providing heat for the carbonization section. The carbonization section flue gas enters the waste heat boiler for waste heat utilization, completing the carbonization section flue gas cycle; the carbonized materials enter the activation section by their own weight, flow countercurrently with the activation gas, and undergo an activation reaction to obtain activated materials; the water gas generated during the activation process enters the activation section flue through the water gas channel, and is combusted with the air supplied by the air supply pipe of the activation section, maintaining the heat of the activation section while generating activation section flue gas. The activation section flue gas enters the waste heat boiler for waste heat utilization. The steam generated by the waste heat boiler is mixed with a part of the carbonization section flue gas and activation section flue gas after waste heat utilization and enters the activation section as the activation gas, completing the activation section flue gas cycle; the activated materials are cooled to obtain the product activated coke.

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