CN216997691U - External heating type activated carbon activation furnace - Google Patents

External heating type activated carbon activation furnace Download PDF

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CN216997691U
CN216997691U CN202220242848.5U CN202220242848U CN216997691U CN 216997691 U CN216997691 U CN 216997691U CN 202220242848 U CN202220242848 U CN 202220242848U CN 216997691 U CN216997691 U CN 216997691U
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activation
combustion chamber
furnace body
furnace
activated carbon
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章水根
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Anhui Jiutai New Material Technology Co ltd
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Anhui Jiutai New Material Technology Co ltd
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Abstract

The utility model discloses an external heating type activated carbon activation furnace, which comprises a furnace body, wherein a central combustion chamber and a plurality of activation channels distributed on the periphery of the central combustion chamber in the circumferential direction are arranged in the furnace body, the central combustion chamber and the activation channels both extend along the axial direction of the furnace body, and the inner diameter of the central combustion chamber is larger than that of the activation channels. The central combustion chamber is arranged in the center of the furnace body, and the plurality of activation channels are distributed on the periphery of the central combustion chamber in a planetary manner; on one hand, the inner diameter of each activation channel is reduced, the loading capacity of the carbonization material is not excessive, the uniform heating can be ensured, and the activation reaction is fully and quickly carried out; on the other hand, the inner diameter of the central combustion chamber is enlarged, the heat is sufficient, heat can be supplied to each activation channel in the whole axial direction and the whole circumferential direction, the activation efficiency of the activated carbon is obviously improved, and the yield and the quality are obviously improved.

Description

External heating type activated carbon activation furnace
Technical Field
The utility model belongs to the technical field of activated carbon processing, and particularly relates to an external heating type activated carbon activation furnace.
Background
In accordance with the heating modeIn contrast, activated carbon activation equipment can be classified into internal heating type and external heating type. Wherein, traditional interior hot type activation equipment lets in high temperature steam in order to turn into the carbonization material with raw materials behind the raw materials burning, and the chemical reaction that takes place is mainly: c + HO2+O2→CO2+H2. The disadvantages of this activation method are: (1) because the oxygen content in the activation chamber is higher, the activation chamber still continuously burns in the early stage of activation, so that the consumption of the carbonized material is large, and the obtained carbon rate is low; (2) when the temperature in the activation chamber is reduced and the combustion is stopped, the carbonized material is reserved, but the activation rate of the obtained carbonized material is lower due to insufficient temperature; (3) high-temperature steam needs to be additionally provided for the activation chamber, so that the energy consumption is high; and the tail gas generated by the activation chamber can not be effectively utilized, thereby causing energy waste.
Compared with the internal heat type activation device, the external heat type activation device is greatly improved. The utility model discloses an external heat rotary type high-quality active carbon high-efficiency energy-saving environment-friendly production device, which comprises a cylindrical rotary activation furnace, wherein the rotary activation furnace comprises an activation cylinder, an annular hearth and a rotary furnace shell which are sequentially arranged from inside to outside, and the annular hearth consists of a plurality of annular combustion chambers which are axially arranged along the activation cylinder; according to the material moving direction, the activation cylinder comprises a feeding end, an warming area, an activation area, a cooling area and a discharging end; a furnace head cover and a furnace tail cover are respectively arranged at two ends of the activation cylinder, a feed hopper communicated with the feed end is arranged on the furnace head cover, and a heating area of the activation cylinder is connected with an auxiliary gas source; the furnace tail cover is provided with a steam pipe which extends to the activation area along the axial direction of the activation cylinder, and a discharge hopper which is communicated with the discharge end.
The external heat rotary type high-efficiency energy-saving environment-friendly production device for the high-quality activated carbon has the following defects: only one activation cylinder with a relatively large inner diameter is arranged in the rotary activation furnace and is arranged in the center of the rotary activation furnace, the annular combustion chambers for heating the activation cylinders are arranged on the periphery of the activation cylinders, and all the annular combustion chambers are distributed along the axial direction of the activation cylinders at intervals; on one hand, the inner diameter of the activation cylinder is larger, the heat supply capacity of the annular combustion chambers arranged at the periphery to the center of the activation cylinder is more limited, and the annular combustion chambers are arranged at intervals, so that the condition of uneven heat supply exists in the circumferential direction of the activation cylinder; the carbonization material in the activation cylinder is loaded too much, and the conditions of uneven heating and insufficient reaction are easy to occur.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an external-heating type activated carbon activation furnace, wherein a carbonized material in an activation channel in the activation furnace is uniformly heated, and an activation reaction can be fully performed.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides an outer hot type activated carbon activation furnace, includes the furnace body, the furnace body in be equipped with central combustion chamber and a plurality of activation of circumference distribution in central combustion chamber periphery and say, central combustion chamber with the activation say and all extend along the furnace body axial, just the internal diameter of central combustion chamber be greater than the internal diameter of activation way.
The utility model changes the position relation of the combustion chamber and the activation channels in the prior art, the central combustion chamber is arranged in the center of the furnace body, and the plurality of activation channels are distributed on the periphery of the central combustion chamber in a planet way; on one hand, the inner diameter of each activation channel is reduced, the loading capacity of the carbonization material is not excessive, the uniform heating can be ensured, and the activation reaction is fully and quickly carried out; on the other hand, the inner diameter of the central combustion chamber is enlarged, the heat is sufficient, heat can be supplied to each activation channel in the whole axial direction and the whole circumferential direction, the activation efficiency of the activated carbon is obviously improved, and the yield and the quality are obviously improved.
In the external heating type activated carbon activation furnace, the heat supply mode of the central combustion chamber is as follows: the activation channel is communicated with the central combustion chamber at the discharge end of the activation channel, an air inlet communicated with the central combustion chamber is formed in the peripheral wall of the furnace body, and the central combustion chamber is provided with a negative pressure outlet formed at the feed end of the furnace body.
Namely, the negative pressure outlet is connected with a negative pressure suction device, so that the activated tail gas in the activation channel can be sucked into the central combustion chamber from the material outlet end of the activation channel, the air outside the furnace body is sucked into the central combustion chamber through the air inlet, and the activated tail gas and the air are combusted in the central combustion chamber, namely, a large amount of high-temperature flue gas is generated to supply heat to each activation channel.
Under the negative pressure suction, the activated tail gas and the high-temperature flue gas cannot escape from the furnace body, so that the step of leading the activated tail gas out of the furnace body, purifying the activated tail gas and then leading the activated tail gas back to the furnace body for combustion is omitted, and the heat loss of the activated tail gas and the high-temperature flue gas is almost zero.
Preferably, in the above external heat activated carbon activation furnace, the air inlets have at least one row arranged circumferentially around the furnace body, and each row has at least two air inlets arranged axially along the furnace body.
Preferably, in the external heating activated carbon activation furnace, the air inlet is located at the rear section of the furnace body. So as to reserve time for the combustion of the activated tail gas and the air and avoid that the sucked air is sucked out of the furnace body by negative pressure after not participating in the combustion.
Preferably, in the external-heating activated carbon activation furnace, the activation channel (23) sequentially comprises a feeding end, an activation area and a discharging end along the material moving direction;
the air inlet (24) is located at least opposite to or downstream of the activation zone.
In the activation tunnel, the temperature requirements of the activation zone are high, so that the air inlet is arranged at least at a position opposite to the activation zone to ensure that the activated tail gas meets the air at least in the activation zone and is combusted to generate heat, so as to realize in-situ heat supply.
Preferably, in the external heating activated carbon activation furnace, a flow rate control valve is provided at the air inlet. The flow regulating valve facilitates adjustment of the opening size of the air inlet to control the amount of air intake into the central combustion chamber.
In the external heating type activated carbon activation furnace, the feeding end of the furnace body is hermetically provided with the self-feeding device, the negative pressure outlet of the central combustion chamber is hermetically and fixedly provided with an isolation sleeve for isolating the central combustion chamber and the activation channel, and the outer end of the isolation sleeve penetrates through the self-feeding device and forms the negative pressure outlet.
The self-feeding device is utilized to seal the feeding end of the furnace body, and the negative pressure outlet of the isolation sleeve is arranged outside the furnace body, so that the high-temperature flue gas is prevented from flowing into the activation channel.
In the external heating type activated carbon activation furnace, the furnace body is arranged on the machine base in a rotating mode and is arranged from the feeding end to the discharging end in a downward inclined mode.
The furnace body is arranged from the feeding end to the discharging end in a downward inclined mode, so that the feeding from the feeding device is facilitated, and the discharging from the discharging end of the product in the activation channel is facilitated.
Preferably, in the external heating activated carbon activation furnace, the self-feeding device comprises:
the device comprises an upper charging barrel, a plurality of material blocking pieces, a plurality of material guiding channels and a plurality of material guiding channels, wherein the upper charging barrel is connected to an activation furnace in a sealing manner and synchronously rotates along with the activation furnace;
the bottom of the hopper is provided with a feeding pipe extending into the upper charging barrel.
The upper charging barrel is fixedly arranged at the feeding end of the activation furnace, so that the upper charging barrel also has a certain inclination angle. When feeding, the carbonized material in the hopper falls into the charging barrel from the feeding pipe, is caught by the material blocking sheet and is temporarily kept in the material guide channel; when no or little material is in the activation channel, the carbonized material in the material guide channel automatically slides into the activation channel, and when the material in the activation channel is enough, the carbonized material is stopped in the material guide channel to wait, so that the activation channel is ensured to be always kept in a material and uncongested state, the activation efficiency is ensured, and the condition of incomplete reaction caused by excessive carbonized material is avoided.
And because the material guide channel is open, along with the rotation of the charging barrel, the carbonized material which does not enter the activation channel can flow among different material guide channels, and the situation that the carbonized material is retained but no material or little material exists in the activation channel can not occur.
Preferably, in the externally heated activated carbon activation furnace, the self-feeding device further includes a storage bin and a screw conveying mechanism for conveying the carbonized material in the storage bin into the hopper, an infrared sensor for monitoring the amount of the carbonized material in the hopper is arranged in the hopper, the infrared sensor and the screw conveying mechanism are both connected to a controller, and the controller is used for receiving an output signal of the infrared sensor and controlling the screw conveying mechanism to operate according to the output signal.
When the infrared sensor detects that the amount of the carbonized materials in the hopper is less than a preset value, a signal is sent to the controller, and the controller starts the spiral conveying mechanism to convey the carbonized materials in the storage bin into the hopper; stopping the spiral conveying mechanism when the hopper is full; therefore, the working personnel only need to fill the storage bin at intervals, and the automatic feeding can be realized through the feeding device.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the central combustion chamber is arranged in the center of the furnace body, and the plurality of activation channels are distributed on the periphery of the central combustion chamber in a planetary manner; on one hand, the inner diameter of each activation channel is reduced, the loading capacity of the carbonization material is not excessive, the uniform heating can be ensured, and the activation reaction is fully and quickly carried out; on the other hand, the inner diameter of the central combustion chamber is enlarged, the heat is sufficient, heat can be supplied to each activation channel in the whole axial direction and the whole circumferential direction, the activation efficiency of the activated carbon is obviously improved, and the yield and the quality are obviously improved; when the activated carbon product with the same quality is produced, the product yield is improved by more than 20 percent compared with the traditional activation equipment.
(2) In the utility model, the heat supply mode of the central combustion chamber is as follows: the activation channel is communicated with the central combustion chamber at the discharge end of the activation channel, an air inlet communicated with the central combustion chamber is formed in the outer peripheral wall of the furnace body, and the central combustion chamber is provided with a negative pressure outlet formed at the feed end of the furnace body; therefore, the negative pressure suction device is connected to the negative pressure outlet, so that the activated tail gas in the activation channel can be sucked into the central combustion chamber from the material outlet end of the activation channel, the air outside the furnace body is sucked into the central combustion chamber through the air inlet, and the activated tail gas and the air are combusted in the central combustion chamber to generate a large amount of high-temperature flue gas to supply heat to each activation channel.
(3) In the utility model, the temperature raising area and the activation area (especially the activation area) of the activation passage have higher requirements on temperature, so that the air inlet is at least arranged at the position opposite to the activation area to ensure that the activated tail gas can meet the air at least in the activation area and combust to generate heat so as to realize in-situ heat supply.
(4) In the utility model, a self-feeding device for feeding each activation channel is used for sealing the feeding end of a furnace body, and an isolation sleeve is fixedly arranged at a negative pressure outlet of a central combustion chamber in a sealing way so as to isolate the central combustion chamber from the activation channels; the outer end of the isolation sleeve penetrates through the self-feeding device and is provided with a negative pressure outlet, so that the mutual influence of the feeding process and the negative pressure leading-out process of the self-feeding device is avoided, and the high-temperature flue gas is prevented from flowing into an activation channel.
Drawings
FIG. 1 is a schematic structural diagram of an external heating activated carbon activation furnace according to the present invention;
FIG. 2 is a schematic view of the structure at the feed end of the furnace body of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the furnace body shown in FIG. 1;
FIG. 4 is a schematic structural view of the upper cartridge of FIG. 1;
fig. 5 is a block diagram of the self-loading apparatus of fig. 1.
Detailed Description
The technical scheme of the utility model is further explained in detail by combining the attached drawings and the detailed description.
As shown in fig. 1, the external heating type activated carbon activation furnace of the present embodiment includes a furnace body 21, the furnace body 21 is rotatably disposed on the machine base 1 through a rotation driving mechanism, and the furnace body 21 is disposed in a downward inclination from a feeding end to a discharging end, so as to facilitate feeding and discharging; the two ends of the furnace body 21 are respectively provided with a self-feeding device 3 and a discharging device 4 in a sealing way.
As shown in fig. 2 and 3, in the present embodiment, a combustion chamber 22 and a plurality of activation passages 23 are formed in the furnace body 21 so as to extend in the axial direction of the furnace body 21; the combustion chamber 22 has a larger inner diameter at the center of the furnace body 21, and the activation ducts 23 have a smaller inner diameter and are uniformly distributed around the periphery of the combustion chamber 22. In the arrangement mode, the activation of the carbonized materials is dispersed in each activation channel 23 and is not required to be crowded in the same activation channel 23, so that the carbonized materials are uniformly heated, the activation reaction is fully performed, and the quality of the activated carbon product is high; and, the combustion chamber 22 having a large volume can sufficiently supply heat to each activation path 23.
In this embodiment, the heat supply manner of the combustion chamber 22 is: each activation channel 23 is arranged to be communicated with the combustion chamber 22 at the discharge end, an air inlet 24 communicated with the combustion chamber 22 is arranged on the peripheral wall of the furnace body 21, and the central combustion chamber 22 is provided with a negative pressure outlet 22a at the feed end of the furnace body 21; after the negative pressure suction device is disposed at the negative pressure outlet 22a, the negative pressure suction device can suck the activated tail gas generated in each activation passage 23 and the air outside the furnace body 21 into the combustion chamber 22 for combustion to release heat.
As shown in fig. 1, in the present embodiment, the air inlet 24 is mainly concentrated at the rear section of the furnace body 21, so as to reserve time for activating the combustion of the exhaust gas and the air, and avoid that the sucked air is sucked out of the furnace body 21 by negative pressure after not participating in the combustion.
Specifically, if the activation tunnel 23 is provided to include a feed end, an activation zone, and a discharge end in this order in the material moving direction, the position of the air inlet 24 is at least opposite to the position of the activation zone or downstream of the activation zone; this is because the activation zone is temperature demanding and therefore the air inlet 24 is located at least opposite the activation zone to ensure that the activated off-gas meets the air at least in the activation zone and is combusted to produce heat for in situ heat supply.
As shown in fig. 1 and 3, in order to ensure that the activation duct 23 communicates with the combustion chamber 22 only at the discharge end thereof, each activation duct 23 and the combustion chamber 22 are isolated from each other in the furnace body 21; an isolation sleeve 25 which prevents the combustion chamber 22 and the activation passage 23 from being communicated at the feed end of the furnace body 21 is also arranged at the feed end of the furnace body 21 and the negative pressure outlet of the combustion chamber 22 in a sealing way; the outer end of the insulating sleeve 25 extends to the outside from the feeding device 3 and is formed with a negative pressure outlet 25a to be connected to a negative pressure suction device.
As shown in fig. 4 and 5 and seen in fig. 1, the self-feeding device 3 of the present embodiment includes an upper charging barrel 31 which is hermetically connected to the furnace body 21 and synchronously rotates with the furnace body 21, both ends of the upper charging barrel 31 are open, one end of the upper charging barrel 31 is directly and hermetically connected to the furnace body 21, and the other end of the upper charging barrel is sealed at the periphery of the isolation sleeve 25 by mixing packing and steel sheets; the inner peripheral wall of the charging barrel 31 is provided with a plurality of material blocking sheets 32, a material guiding channel 33 is formed between two adjacent material blocking sheets 32, and the material guiding channels 33 and the activation channels 23 are also arranged in one-to-one correspondence.
The self-feeding device 3 further comprises a hopper 34, the bottom of the hopper 34 being provided with a feeding pipe 35 extending into the upper barrel 31.
During feeding, the carbonized material in the hopper 34 falls into the upper charging barrel 31 from the feeding pipe 35, and is caught by the material blocking sheet 32 and stays in the material guiding channel 33; because the charging barrel 31 and the activation furnace 2 are both arranged from the charging end to the discharging end in a downward inclination manner, when no material or little material exists in the activation channel 23, the carbonized material in the material guide channel 33 automatically slides into the activation channel 23, and when the material in the activation channel 23 is enough, the carbonized material is stopped in the material guide channel 33 to wait, so that the activation channel 23 is ensured to be kept in a material and uncongested state all the time, the activation efficiency is ensured, and the condition of incomplete reaction caused by excessive carbonized material is avoided. Moreover, because the material guiding channels 33 are open, the carbonized materials which do not enter the activation channel 23 can flow between different material guiding channels 33 along with the rotation of the charging barrel 31, and the situation that the carbonized materials are retained but no or little materials exist in the activation channel 23 can not occur.
In order to further improve the material guiding effect of the material guiding channel 33 and promote the carbonized materials to rapidly enter the corresponding activation channel 23, the material guiding channel 33 is axially arranged obliquely relative to the upper charging barrel 31, and the oblique direction of the material guiding channel 33 is opposite to the rotating direction of the upper charging barrel 31 at one end of the upper charging barrel 31 close to the furnace body 21.
As shown in FIG. 5, in this embodiment, a screw conveyor 36 is used to feed the carbonized material in the storage bin 37 into the hopper 34. Meanwhile, in order to prevent the hopper 34 from being full, an infrared sensor 38 is installed in the hopper 34 to detect whether there is material in the hopper 34 in real time. When the infrared sensor 38 detects that the amount of the carbonized material in the hopper 34 is less than the preset value, a signal is sent to the controller 39, and the controller 39 starts the screw conveying mechanism 36 to convey the carbonized material in the storage bin 37 into the hopper 34; stopping the screw conveying mechanism 36 when the hopper 34 is full; therefore, the worker only needs to fill the storage bin 37 at intervals, and full-automatic feeding can be realized through the feeding device 3.
The working principle of the external heating type activated carbon activation furnace in the embodiment is as follows:
an infrared sensor 38 in the hopper 34 detects the amount of the carbonized material in the hopper in real time, when the detected amount is smaller than a preset value, a signal is sent to a controller 39, the controller 39 starts a spiral conveying mechanism 36, the spiral conveying mechanism 36 conveys the carbonized material in a storage bin 37 into the hopper 34 at a preset speed, and the conveying is stopped when the hopper 34 is full; the carbonized material in the hopper 34 falls into the feeding barrel 31 through the feeding pipe 35 at a certain speed and falls into the material guiding channel 33;
starting the rotary driving mechanism 9 to make the furnace body 21 rotate, the charging barrel 31 and the furnace body 21 rotate synchronously, and during the rotation process, the carbonized material in the material guide channel 33 automatically enters the corresponding activation channel 23 until the activation channel 23 is full of material; with the proceeding of the activation reaction in the activation channel 23, the obtained activated carbon is continuously discharged, and then the material guide channel 33 continuously feeds materials to the corresponding activation channel 23;
when the activation is started, the furnace tail cover 27 at the discharge end of the activation furnace 2 is firstly opened, the carbonized materials in each activation channel 23 are ignited by gas, and a small amount of air is conveyed into each activation channel 23, so that the carbonized materials in each activation channel 23 are firstly combusted to generate activated tail gas;
and then the furnace tail cover 27 is sealed and closed, the negative pressure suction device is started, and the activated tail gas in the activation passage 23 and the air outside the furnace body 21 are sucked into the combustion chamber 22, so that the activated tail gas is fully combusted, and high-temperature flue gas is generated to supply heat for each activation passage 23.

Claims (10)

1. The utility model provides an outer hot type activated carbon activation furnace, includes furnace body (21), its characterized in that, furnace body (21) in be equipped with central combustion chamber (22) and a plurality of activation way (23) of circumference distribution in central combustion chamber (22) periphery, central combustion chamber (22) with activation way (23) all along furnace body (21) axial extension, just the internal diameter of central combustion chamber (22) be greater than the internal diameter of activation way (23).
2. The external-heating activated carbon activation furnace as claimed in claim 1, wherein the activation channel (23) is communicated with the central combustion chamber (22) at the discharge end thereof, the outer peripheral wall of the furnace body (21) is provided with an air inlet (24) communicated with the central combustion chamber (22), and the central combustion chamber (22) is provided with a negative pressure outlet formed at the feed end of the furnace body (21).
3. The external-heated activated carbon activation furnace as claimed in claim 2, wherein the air inlets (24) have at least one row arranged circumferentially around the furnace body (21), and each row of air inlets (24) has at least two rows arranged axially along the furnace body (21).
4. The external-heated activated carbon activation furnace as claimed in claim 2, wherein the air inlet (24) is located at the rear section of the furnace body (21).
5. The external-heated activated carbon activation furnace as claimed in claim 4, wherein the activation channel (23) comprises a feeding end, an activation area and a discharging end in sequence along the material moving direction;
the air inlet (24) is located at least opposite to or downstream of the activation zone.
6. The external-heated activated carbon activation furnace according to claim 2, wherein a flow regulating valve is provided at the air inlet (24).
7. The external-heating activated carbon activation furnace according to any one of claims 2 to 6, wherein the self-feeding device (3) is hermetically installed at the feeding end of the furnace body (21), an isolation sleeve (25) for isolating the central combustion chamber (22) from the activation channel (23) is hermetically fixed at the negative pressure outlet of the central combustion chamber (22), and the external end of the isolation sleeve (25) penetrates through the self-feeding device (3) and forms the negative pressure outlet.
8. The external-heated activated carbon activation furnace as claimed in claim 7, wherein the furnace body (21) is rotatably disposed on the frame (1) and is inclined downward from the feed end to the discharge end.
9. The external-heated activated carbon activation furnace according to claim 8, wherein the self-feeding device (3) comprises:
the device comprises an upper charging barrel (31), wherein the upper charging barrel (31) is connected to an activation furnace (2) in a sealing manner and synchronously rotates along with the activation furnace (2), a plurality of material blocking pieces (32) are arranged on the inner peripheral wall of the upper charging barrel (31), a material guide channel (33) is formed between every two adjacent material blocking pieces (32), and the material guide channels (33) and the activation channels (23) are arranged in a one-to-one correspondence manner;
a hopper (34), wherein the bottom of the hopper (34) is provided with a feeding pipe (35) extending into the upper charging barrel (31).
10. The external-heating activated carbon activation furnace according to claim 9, wherein the self-feeding device (3) further comprises a storage bin (37) and a screw conveyor (36) for feeding the carbonized material in the storage bin (37) into the hopper (34), an infrared sensor (38) for monitoring the amount of the carbonized material in the hopper (34) is arranged in the hopper (34), the infrared sensor (38) and the screw conveyor (36) are both connected to a controller (39), and the controller (39) is used for receiving an output signal of the infrared sensor (38) and controlling the operation of the screw conveyor (36) according to the output signal.
CN202220242848.5U 2022-01-28 2022-01-28 External heating type activated carbon activation furnace Active CN216997691U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220242848.5U CN216997691U (en) 2022-01-28 2022-01-28 External heating type activated carbon activation furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220242848.5U CN216997691U (en) 2022-01-28 2022-01-28 External heating type activated carbon activation furnace

Publications (1)

Publication Number Publication Date
CN216997691U true CN216997691U (en) 2022-07-19

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CN202220242848.5U Active CN216997691U (en) 2022-01-28 2022-01-28 External heating type activated carbon activation furnace

Country Status (1)

Country Link
CN (1) CN216997691U (en)

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