CN116004265A - Carbonization and activation flue gas double-circulation coke oven system and method - Google Patents

Abstract

The invention discloses a carbonization and activation flue gas double-circulation coke oven system and a method, wherein the carbonization and activation flue gas double-circulation coke oven system comprises a coke oven, a waste heat boiler and a purification unit, the coke oven comprises a oven body, a carbonization section and an activation section are sequentially arranged in the oven body from top to bottom, and the carbonization section and the activation section are communicated through a plurality of material channels arranged at intervals; the peripheral region of a plurality of material channels forms a flue, the top and the bottom of the flue are all sealed, a sealing section is arranged at the position 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 fuel 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-circulation coke oven system has the advantages of 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, timely discharge of tar and blockage and scaling prevention.

Description

Carbonization and activation flue gas double-circulation coke oven system and method

Technical Field

The invention belongs to the technical field of material preparation, and particularly relates to a carbonization and activation flue gas double-circulation coke oven system and method.

Background

Coal is a fuel, and is a raw material with low cost and easy availability for preparing carbon materials, and active coke for desulfurization and denitrification is prepared by taking coal as a raw material at present. The existing carbonization and activation equipment for preparing active coke is a horizontal rotary furnace and a vertical Sieve furnace, wherein:

the horizontal rotary furnace realizes material overturning through the rotation of the furnace body according to a certain angle, so as to realize carbonization and contact activation of the material and an activating agent, but the horizontal rotary furnace has the problems of large occupied area, high investment cost, low temperature control precision and the like.

The generation of the activation steam of the vertical type Siwearing furnace is realized by switching left and right combustion chamber heat storage bricks, the process is complex, and the steam temperature is uncontrollable; the vertical type Sijeep furnace can only activate carbonized materials, because the problems of coking and scaling of furnace walls, blockage of precipitated gas channels, bonding of materials, and the like are difficult to occur because tar, volatile matters and fine crushed powder are less in the heating process of carbonized materials, the vertical type Sijeep furnace is only an activation furnace and cannot be used as a carbonization activation furnace for preparing coke from raw coal in one step, and the adaptability of the raw materials is poor aiming at fixed particles and specific operation parameters.

In addition, the existing carbonization and activation equipment for preparing active coke mostly depends on an external heat source, and has high energy consumption.

Disclosure of Invention

Therefore, one purpose of the invention is to provide a carbonization and activation flue gas double-circulation coke oven system, which has the advantages of accurate temperature control, high coke quality, high activation gas temperature, shortened activation time, good activation effect, reasonable heat utilization, low energy consumption, low coke manufacturing cost, timely discharge of tar and blockage and scaling prevention.

Another object of the present invention is to provide a method for preparing active coke.

To achieve the above object, an embodiment of a first aspect of the present invention provides a carbonization-activation flue gas dual-cycle coke oven system, including:

the coke making furnace comprises a furnace body, wherein 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 material channels arranged at intervals; the peripheral areas of a plurality of material channels form a flue, the top and the bottom of the flue are both sealed, a sealing section is arranged at the position 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 fuel 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 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;

the inlet of the purifying unit is communicated with the outlet of the pyrolysis gas extraction pipe, and the outlet of the purifying unit is communicated with the gas inlet of the carbonization section.

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

In some embodiments of the invention, one end of the pyrolysis gas extraction tube extends out of the furnace body and the other end passes through all of the material channels and communicates with each material channel.

In some embodiments of the invention, the part of the flue positioned at the carbonization section is provided with a carbonization section air supplementing pipe, and the part of the flue positioned at the activation section is provided with an activation section air supplementing pipe.

In some embodiments of the present invention, the sidewall of the material channel at the location of the activation section is provided with a plurality of water gas channels and a plurality of activated gas holes, the plurality of water gas channels are located above the plurality of activated gas holes, and the plurality of activated gas holes are all communicated with the activated gas inlet.

In some embodiments of the invention, a plurality of activated gas holes are in communication with the activated gas inlet through an activated gas grille disposed in a portion of the flue at an activation stage.

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

In some embodiments of the invention, the water gas channel is inclined downwardly from the outside of the channel to the inside of the channel, at an angle of between 45-70 °.

In some embodiments of the present invention, the sealing section is made of refractory bricks, and the height of the sealing section is 2-5 times of the internal width of the material channel.

In some embodiments of the invention, the coke oven further comprises a cooling section disposed within the oven body; the cooling section is positioned below the activation section and is communicated with the activation section; the cooling section is provided with a cooling pipe.

In some embodiments of the invention, the activation section flue gas outlet is provided at the bottom of the activation section.

In some embodiments of the invention, the purification unit comprises a leaching tower, an electrical tar precipitator, an induced draft fan, a gas tank, a compressor and a compressed gas tank which are communicated in sequence; the inlet of the leaching tower is communicated with the pyrolysis gas extraction pipe, and the outlet of the compressed gas tank is communicated with the gas inlet of the carbonization section.

In some embodiments of the invention, the water side inlet of the waste heat boiler is in communication with a feed pump and the flue gas side outlet of the waste heat boiler is in communication with a chimney.

In order to achieve the above object, a first aspect of the present invention provides a method for preparing activated coke, the method using the carbonization activated flue gas dual-cycle coke oven system of the first aspect of the present invention, comprising

Raw coal particles enter a carbonization section channel of a coke making furnace to undergo carbonization reaction to obtain carbonized materials;

volatile matters and tar separated out in the carbonization process are discharged and purified through a pyrolysis gas extraction pipe under the action of an induced draft fan, and then are combured by air from a carbonization section air supplementing pipe to provide heat for a carbonization section, and simultaneously generated carbonization section flue gas enters a waste heat boiler for waste heat utilization, so that the carbonization section flue gas circulation is completed;

the carbonized material enters an activation section by means of dead weight, and flows back to the activation gas to perform activation reaction to obtain an activated material;

the water gas generated in the activation process enters an activation section flue through a water gas channel, is subjected to combustion supporting by an activation section air supplementing pipe, and simultaneously generates activation section flue gas which enters a waste heat boiler to be utilized while maintaining heat of the activation section, and steam generated by the waste heat boiler is mixed with part of carbonized section flue gas and activation section flue gas after the waste heat utilization and then enters the activation section as activation gas to complete the activation section flue gas circulation;

and cooling the activating material to obtain the product active coke.

The carbonization and activation flue gas double-circulation coke oven system provided by the embodiment of the invention has the following beneficial effects:

(1) The flue gas of the carbonization section and the flue gas of the activation section are double-circulated, the temperature control is accurate, and the quality of the prepared coke is high.

The carbonization section and the activation section are provided with double smoke circulation, the heating speed and the final temperature of the carbonization section and the activation section can be independently controlled, the temperature control is accurate, the best parameter coke making is facilitated, and the quality of the obtained active coke is high.

(2) The activating gas has high temperature, short activating time and good activating effect.

The low-temperature activated steam is directly mixed with part of high-temperature flue gas, and then the activation is performed, so that the temperature of the activation atmosphere is ensured to be high enough, the coke material can be effectively activated, and the activation effect is good.

(3) Tar can be discharged in time, and the problem of blockage and scaling is prevented.

The carbonization section flue gas system is independently circulated, so that the tar output can be controlled, meanwhile, the material layer in the carbonization section material channel is arranged for negative pressure operation, the tar can be discharged in time, and the blockage and scaling problems can not be caused.

(4) The heat utilization is reasonable, the energy consumption is low, and the coke making cost is low.

According to the invention, the high-temperature flue gas is used for heating the carbonization section and the activation section respectively, the tail flue gas is used for heating water firstly, then the tail flue gas is directly mixed with the flue gas to heat water vapor, the cascade utilization of the flue gas is realized, the heat of the whole system comes from the separated gas, the heat utilization is reasonable, an external heat source is not needed, and the coke making energy consumption is low and the cost is low.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a simple block diagram of a carbonization-activation flue gas dual cycle coke oven system according to one embodiment of the present invention (also a simple flow chart of a method of preparing activated coke according to one embodiment of the present invention).

FIG. 2 is a cross-sectional view of the material path of a coke oven in a carbonization activated flue gas dual cycle coke oven system in accordance with one embodiment of the invention.

Reference numerals:

1-a coke oven; 2-carbonizing section fume outlet; 3-leaching tower; 4-induced draft fan; 5-compressor; 6-an electrical tar precipitator; 7-a gas tank; 8-compressing a gas tank; 9-carbonizing section gas inlet; 10-a water supply pump; 11-chimney; 12-cooling pipes; 13-an activation section flue gas outlet; 14-a waste heat boiler; 15-a feed inlet; 16-pyrolysis gas extraction pipe; 17-carbonization section air supplementing pipe; 18-material channel; 19-a sealing section; 20-water gas channel; 21-an activation section air make-up tube; 22-active coke outlet; 23-activated gas holes; 24-an activated gas grid; 25-flue.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The following describes a carbonization activated flue gas dual-cycle coke oven system and a preparation method of activated coke in the embodiment of the invention with reference to the accompanying drawings.

FIG. 1 is a simplified block diagram of a carbonization activated flue gas dual cycle coke oven system in accordance with one embodiment of the invention.

As shown in fig. 1, the carbonization-activation flue gas dual-cycle coke oven system of the embodiment of the invention comprises a coke oven 1, a waste heat boiler 14 and a purification unit; the coke oven 1 comprises an oven body, wherein a carbonization section 100 and an activation section 200 are sequentially arranged in the oven body from top to bottom, and the carbonization section 100 and the activation section 200 are communicated through a plurality of material channels 18 which are arranged at intervals; the peripheral areas of a plurality of material channels 18 form a flue 25, the top and the bottom of the flue 25 are all sealed, a sealing section 19 is arranged at the position of the flue 25 between a carbonization section 100 and an activation section 200, the carbonization section 100 is provided with a carbonization section flue gas outlet 2, a carbonization section fuel gas inlet 9 and a pyrolysis gas extraction pipe 16, and the activation section 200 is provided with an activation section flue gas outlet 13 and an activation gas inlet; the flue gas side inlet of the waste heat boiler 14 is communicated with the carbonization section flue gas outlet 2 and the activation section flue gas outlet 13, and the steam side outlet and the flue gas outlet of the waste heat boiler 14 are both communicated with the activation gas inlet; the inlet of the purifying unit is communicated with the outlet of the pyrolysis gas extraction pipe 16, and the outlet of the purifying unit is communicated with the carbonization section fuel gas inlet 9.

It can be understood that the flue is a flue gas channel, the flue gas outlet 2 of the carbonization section and the flue gas inlet 9 of the carbonization section are communicated with the part of the flue positioned in the carbonization section (abbreviated as carbonization flue), and the flue gas outlet 13 of the activation section is communicated with the part of the flue positioned in the activation section (abbreviated as activation flue), so that the flue gas of the carbonization section and the activation section can be conveniently discharged in time or the flue gas can enter the flue. The areas around the plurality of material channels 18 include the areas between two adjacent material channels and the areas between the plurality of material channels and the side walls of the furnace body.

The carbonization and activation flue gas double-circulation coke oven system provided by the embodiment of the invention has the following advantages:

(1) The flue gas of the carbonization section and the flue gas of the activation section are double-circulated, the temperature control is accurate, and the quality of the prepared coke is high.

The carbonization section and the activation section are provided with double smoke circulation, the heating speed and the final temperature of the carbonization section and the activation section can be independently controlled, the temperature control is accurate, the best parameter coke making is facilitated, and the quality of the obtained active coke is high.

(2) The activating gas has high temperature, short activating time and good activating effect.

The low-temperature activated steam is directly mixed with part of high-temperature flue gas, and then the activation is performed, so that the temperature of the activation atmosphere is ensured to be high enough, the coke material can be effectively activated, and the activation effect is good.

(3) Tar can be discharged in time, and the problem of blockage and scaling is prevented.

The carbonization section flue gas system is independently circulated, so that the tar output can be controlled, meanwhile, the material layer in the carbonization section material channel is arranged for negative pressure operation, the tar can be discharged in time, and the blockage and scaling problems can not be caused.

(4) The heat utilization is reasonable, the energy consumption is low, and the coke making cost is low.

According to the invention, the high-temperature flue gas is used for heating the carbonization section and the activation section respectively, the tail flue gas is used for heating water firstly, then the tail flue gas is directly mixed with the flue gas to heat water vapor, the cascade utilization of the flue gas is realized, the heat of the whole system comes from the separated gas, the heat utilization is reasonable, an external heat source is not needed, and the coke making energy consumption is low and the cost is low.

In the present invention, the shape of the furnace body is not limited, and the main body part provided with the carbonization section, the activation section, etc. may be a cylinder, a cuboid, a cube, a prism, etc., as one possible example, as shown in fig. 1 and 2, the main body part of the furnace body is in a cuboid shape, the top part is integrally formed or welded with a pyramid-shaped feed port 15, and the bottom part is integrally formed or welded with a pyramid-shaped active coke outlet 22 with a large upper part and a small lower part.

In some embodiments, one end of the pyrolysis gas extraction tube 6 extends out of the furnace body through a mounting hole on the furnace body and is mounted and fixed with the furnace body in a sealing way through a sealing ring and the like, and the other end passes through all material channels and is communicated with each material channel. It will be appreciated that, since the plurality of channels are spaced apart and the flue has a plurality of peripheral regions, the pyrolysis gas extraction duct 6 passes through the channels and also through the portion of the flue between adjacent two of the channels. Optionally, as a possible example, each material channel side wall is provided with a mounting hole through which the pyrolysis gas extraction pipe passes, and the pyrolysis gas extraction pipe and each material channel are in sealing and fixed connection in a welding mode or the like, one end of the pyrolysis gas extraction pipe, which is far away from the pyrolysis gas outlet, may be closed, in order to ensure that the precipitated gas in each material channel can be smoothly extracted, at least one precipitated air hole may be formed in a pipe section of the pyrolysis gas extraction pipe extending into each material channel, or a precipitation pipeline may be further installed at the positions of the precipitated air holes.

In some embodiments, the pyrolysis gas extraction tube 6 may be 1 separate line; in other embodiments, the pyrolysis gas extraction tube 6 may be an integral main tube made up of a plurality of grid-shaped tubes, which are connected to the outside through a single tube, provided that the grid-shaped tubes do not affect the normal falling of the material in the material channel.

In some embodiments, in order to burn the gas separated out from the carbonization section and the water gas from the activation section, the part of the flue located in the carbonization section is provided with a carbonization section air supplementing pipe 17, and the part of the flue located in the activation section is provided with an activation section air supplementing pipe 21, which can respectively provide air for the carbonization section flue and the activation section flue for supporting combustion.

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 flue gas outlet 2 of the carbonization section is arranged at the top of the carbonization section, and the gas inlet 9 of the carbonization section is arranged at the bottom of the carbonization section, so that volatile matters and tar separated out in the heating process of materials in the carbonization section can be conveniently and fully combusted from bottom to top after entering the flue of the carbonization section again after being purified, and the volatile matters and tar are discharged out of the carbonization section after providing heat for the carbonization section.

In some embodiments, the sidewall of the portion of the material channel 18 located in the activation section 100 is provided with a plurality of water gas channels 20 and a plurality of activated gas holes 23, the plurality of water gas channels 20 are located above the plurality of activated gas holes 23, and the plurality of activated gas holes 23 are all in communication with the activated gas inlet. The water gas channel is arranged above the activated gas hole, the activated gas can be in countercurrent contact with the material falling from the carbonization section from bottom to top for activation, the generated water gas and the unreacted and completely activated gas can enter a flue passing through the water gas channel from bottom to top and enter the activation section, and burn under the air supplemented by the air supplementing pipe 21 of the activation section, supplement heat for the activation section and heat the unreacted and completely activated gas, and maintain the temperature of the activation section.

In some embodiments, the plurality of water gas channels 20 are divided into two groups, oppositely disposed on opposite sidewalls of the channel 18. As one possible example, the number of water gas channels 20 and the number of activated gas holes 23 may each be a plurality of through holes arrayed on the side wall of the channel.

In the same longitudinal section, the number of the water gas channels arranged on the single side wall of each material channel along the height direction of the furnace body is not too large, generally 1-2, the arrangement of the activated gas holes can be influenced by too much arrangement, so that the uniform distribution of the activated gas in the material channel is influenced, and meanwhile, more positions can be reserved for the activated gas holes as the water gas channels are closer to the top of the activation section; the number of the activated gas holes 23 can be set to be larger, for example, 4-10, and the activated gas holes are uniformly distributed from the bottom of the activation section to the lower end of the water gas channel, so that the material layers of each material channel of the activation section are ensured to have enough and uniformly distributed activated gas.

In some embodiments, the water gas channel 20 is disposed obliquely downward from the outside of the channel to the inside of the channel, with an angle of between 45-70 °, preferably 50-60 °. The activated gas holes 23 may be arranged in the same manner and at the same inclination angle as the water gas channels 20, or may be arranged horizontally (as shown in fig. 1).

As a possible example, 1 drainage gas channel 20 (10) are uniformly distributed from the outside of the material channel to the inside of the material channel and inclined downwards by 58 degrees at the position of the top of the activation section on two opposite side walls of the material channel.

It should be noted that, in the present invention, the manner in which the plurality of activated gas holes 23 communicate with the activated gas inlet is not limited, and as one possible example, the plurality of activated gas holes 23 communicate with the activated gas inlet through the activated gas grid 24, and the activated gas grid 24 is provided at a portion of the flue at the activation section. The activated gas grid structure is the same as the existing ammonia injection grid structure, but the injected gas is changed from ammonia gas to air, and the specific structure is not described herein.

In some embodiments, the sealing section is made of refractory bricks, the flue is sealed, and the flue is divided into a carbonization section flue and an activation section flue, so that the carbonization section flue gas circulation and the activation section flue gas circulation are facilitated. The height of the seal section is 2-5 times, preferably 3 or 4 times, the width of the inside of the channel (as shown in fig. 1, the length in the horizontal direction).

In some embodiments, in order to directly cool the material obtained in the activation section without transfer, the coke oven further comprises a cooling section 300, the cooling section 300 being provided within the oven body; the cooling section 300 is positioned below the activation section and is communicated with the activation section; the cooling section 300 is provided with cooling pipes 12. The cooling pipe can adopt coil pipe form, and its both ends all stretch out the furnace body, and one end intercommunication cooling medium such as cold water, one end can communicate heat transfer device etc. and carry out recycle to heat.

In some embodiments, the flue gas outlet 13 of the activation section is arranged at the bottom of the activation section, so that water gas generated by activation flows out of the water gas channel, is combured by air from the air supplementing pipe of the activation section from top to bottom in the activation flue, provides heat for the activation section after full combustion, and heats the unreacted and completely activated gas.

In some embodiments, the purification unit comprises a leaching tower 3, an electrical tar precipitator 6, an induced draft fan 4, a gas tank 7, a compressor 5 and a compressed gas tank 8 which are sequentially communicated through pipelines and the like; the inlet of the leaching tower 3 is communicated with a pyrolysis gas extraction pipe 16, and the outlet of the compressed gas tank 8 is communicated with a carbonization section fuel gas inlet 9. The separated gas containing volatile and tar produced in the carbonization section can remove tar through a purification unit.

In some embodiments, the water side inlet of the waste heat boiler 14 is communicated with the water feeding pump 10 through a pipeline, and the flue gas side outlet of the waste heat boiler 14 is communicated with the chimney 11, so that waste heat utilization of the flue gas of the carbonization section and the flue gas of the activation section is realized.

The operation method of the carbonization and activation flue gas double-circulation coke oven system provided by the embodiment of the invention comprises the following steps:

raw coal particles firstly enter a carbonization section material channel of the coke making furnace 1, slowly fall down by self weight, sequentially pass through an activation section 200 and a cooling section 300, and are discharged from the bottom of the coke making furnace 1;

volatile matters and tar are separated out in the heating process of materials in a carbonization section of the coke oven 1, negative pressure is generated in a material layer of the carbonization section by virtue of an induced draft fan 4 (the negative pressure is generally between (-50) - (-200) Pa, preferably (-80) - (-150) Pa, more preferably-100 Pa), the pyrolysis gas is discharged from a pyrolysis gas extraction pipe 16 arranged in the middle of the carbonization section, the pyrolysis gas after cooling and purifying is stored in a compressed gas tank 8, the gas of the compressed gas tank 8 enters from a gas inlet 9 of the carbonization section of the coke oven, the combustion of the gas is assisted by air of an air supplementing pipe 17 of the carbonization section, and the flue gas is discharged from a flue gas outlet 2 of the carbonization section of the coke oven from bottom to top and then enters a waste heat utilization of a waste heat boiler 14 to complete the circulation of the flue gas in the carbonization section.

The carbonization section flue gas and the activation section flue gas both enter the waste heat boiler 14 for full combustion, part of generated high-temperature flue gas is directly mixed with low-temperature steam, mixed activation gas enters a material layer in an activation section material channel through an activation gas grid 24, the mixed gas is upwards along gaps of material particles in the material layer, the material particles are slowly downwards, two countercurrent contact activation are carried out, finally, water gas generated by activation and unreacted complete activation gas are discharged from an activation section water gas channel 20 and enter the activation section flue gas channel from top to bottom, an air supplementing pipe 21 is arranged in the activation section flue gas channel, so that the water gas is primarily combusted to maintain heat of the activation section, and finally, the water gas is discharged from the bottom of the activation section and enters the waste heat boiler 14, and the activation section flue gas circulation is completed.

The preparation method of the active coke is similar to the operation method of the carbonization and activation flue gas double-circulation coke making furnace system, which is carried out by using the carbonization and activation flue gas double-circulation coke making furnace system, and comprises the following steps:

raw coal particles enter a carbonization section channel of a coke making furnace to undergo carbonization reaction to obtain carbonized materials; volatile matters and tar separated out in the carbonization process are discharged through a pyrolysis gas extraction pipe under the action of an induced draft fan, purified by a purification unit and then combured by air from a carbonization section air supplementing pipe, and generated carbonization section flue gas enters a waste heat boiler to be utilized by waste heat while providing heat for a carbonization section, so that the carbonization section flue gas circulation is completed;

the carbonized material enters an activation section by means of dead weight, and flows back to the activation gas to perform activation reaction to obtain an activated material; the water gas generated in the activation process enters an activation section flue through a water gas channel, is subjected to combustion supporting by an activation section air supplementing pipe, and simultaneously generates activation section flue gas which enters a waste heat boiler to be utilized while maintaining heat of the activation section, and steam generated by the waste heat boiler is mixed with part of carbonized section flue gas and activation section flue gas after the waste heat utilization and then enters the activation section as activation gas to complete the activation section flue gas circulation;

the activated material falls into the cooling section by self weight, and after cooling, the activated coke product is obtained and discharged and collected through an activated coke outlet.

In some embodiments of the invention, after 400-550 ℃ water vapor generated by the waste heat boiler is mixed with part of carbonization section flue gas and activation section flue gas (the temperature of mixed flue gas is 950-1200 ℃) after waste heat utilization, the obtained temperature of activation gas entering the activation section is 750-850 ℃, and the volume fraction of the water vapor is 20-70%. Preferably, the temperature of the water vapor generated by the waste heat boiler is 430-520 ℃, the temperature of the mixed flue gas is 1000-1150 ℃, the temperature of the activated gas entering the activation section is 780-820 ℃, and the volume fraction of the water vapor is 40-60%. As a possible example, after 500 ℃ water vapor generated by the waste heat boiler is mixed with part of the carbonized section flue gas and the activated section flue gas (the temperature of the mixed flue gas is 1100 ℃) after the waste heat is utilized, the obtained temperature of the activated gas entering the activated section is 800 ℃, and the volume fraction of the water vapor is 50%.

In some embodiments of the invention, the induced draft fan creates a negative pressure state within the carbonization section feed path while extracting volatiles and tars separated out during carbonization through the pyrolysis gas extraction line, the negative pressure being typically between (-50) - (-200) Pa, preferably (-80) - (-150) Pa, more preferably-100 Pa.

The innovation points of the invention are mainly as follows:

compared with the traditional coke oven, the carbonization and activation flue gas double-circulation coke oven provided by the embodiment of the invention has the following settings:

(1) High-temperature flue gas double circulation of carbonization section and activation section: after separated gas generated in the carbonization process is collected independently, the carbonization section and the activation section are heated respectively, the carbonization temperature rising characteristic and the activation temperature characteristic can be controlled independently, and the double circulation system is beneficial to preparing high-quality active coke.

(2) Mixing low-temperature activated water vapor with high-temperature flue gas to activate gas components: the activation temperature is directly related to the quality of active coke, but the traditional activated gas component at about 800 ℃ is difficult to obtain.

(3) Consider the problem of tar removal from the carbonization section: the rapid and smooth discharge of tar is the key of stable and safe operation of a coke oven system, and the scheme is provided with the carbonization section coke oven negative pressure operation and an independent discharge and treatment system, so that the tar problem can be effectively prevented.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A carbonization-activation flue gas dual-cycle coke oven system, comprising:

the coke making furnace comprises a furnace body, wherein 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 material channels arranged at intervals; the peripheral areas of a plurality of material channels form a flue, the top and the bottom of the flue are both sealed, a sealing section is arranged at the position 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 fuel 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 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;

the inlet of the purifying unit is communicated with the outlet of the pyrolysis gas extraction pipe, and the outlet of the purifying unit is communicated with the gas inlet of the carbonization section.

2. The carbonization and activation flue gas dual cycle coke oven system according to claim 1, wherein the flue gas outlet of the carbonization section, the pyrolysis gas extraction pipe and the gas inlet of the carbonization section are sequentially arranged from top to bottom; the flue gas outlet of the activation section is arranged at the bottom of the activation section.

3. The carbonization and activation flue gas dual cycle coke oven system of claim 1, wherein one end of the pyrolysis gas extraction tube extends out of the oven body and the other end passes through all of the material channels and communicates with each of the material channels.

4. The carbonization and activation flue gas dual cycle coke oven system of claim 1, wherein the portion of the flue located in the carbonization section is provided with a carbonization section air supplementing pipe, and the portion of the flue located in the activation section is provided with an activation section air supplementing pipe.

5. The carbonization and activation flue gas dual cycle coke oven system of claim 1, wherein the sidewall of the portion of the material channel located in the activation section is provided with a plurality of water gas channels and a plurality of activation gas holes, 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.

6. The carbonized activated flue gas dual cycle coke oven system of claim 5, wherein a number of activated gas holes are in communication with the activated gas inlet through an activated gas grid disposed in the portion of the flue at the activation section.

7. The carbonization and activation flue gas dual cycle coke oven system of claim 1, wherein a plurality of water gas channels are divided into two groups, oppositely arranged on two opposite side walls of the material channel;

preferably, the water gas channel is obliquely arranged downwards from the outer side of the material channel to the inner side of the material channel, and the inclination angle is between 45 and 70 degrees.

8. The carbonization and activation flue gas dual cycle coke oven system of claim 1, wherein the coke oven further comprises a cooling section, the cooling section being disposed within the oven body; the cooling section is positioned below the activation section and is communicated with the activation section; the cooling section is provided with a cooling pipe;

the sealing section is made of refractory bricks, and the height of the sealing section is 2-5 times of the width of the inside of the material channel;

the water side inlet of the waste heat boiler is communicated with the water feeding pump, and the flue gas side outlet of the waste heat boiler is communicated with the chimney.

9. The carbonization and activation flue gas dual cycle coke oven system of claim 1, wherein the purification unit comprises a leaching tower, an electrical tar precipitator, an induced draft fan, a gas tank, a compressor and a compressed gas tank which are sequentially communicated; the inlet of the leaching tower is communicated with the pyrolysis gas extraction pipe, and the outlet of the compressed gas tank is communicated with the gas inlet of the carbonization section.

10. A method for preparing activated coke by using the carbonization and activation flue gas dual-cycle coke oven system as claimed in any one of claims 1 to 9, comprising

Raw coal particles enter a carbonization section channel of a coke making furnace to undergo carbonization reaction to obtain carbonized materials;

volatile matters and tar separated out in the carbonization process are discharged and purified through a pyrolysis gas extraction pipe under the action of an induced draft fan, and then are combured by air from a carbonization section air supplementing pipe to provide heat for a carbonization section, and simultaneously generated carbonization section flue gas enters a waste heat boiler for waste heat utilization, so that the carbonization section flue gas circulation is completed;

the carbonized material enters an activation section by means of dead weight, and flows back to the activation gas to perform activation reaction to obtain an activated material;

the water gas generated in the activation process enters an activation section flue through a water gas channel, is subjected to combustion supporting by an activation section air supplementing pipe, and simultaneously generates activation section flue gas which enters a waste heat boiler to be utilized while maintaining heat of the activation section, and steam generated by the waste heat boiler is mixed with part of carbonized section flue gas and activation section flue gas after the waste heat utilization and then enters the activation section as activation gas to complete the activation section flue gas circulation;

and cooling the activating material to obtain the product active coke.

Images