CN112090417A - Powdered activated carbon regeneration device based on airflow heating and regeneration method thereof - Google Patents
Powdered activated carbon regeneration device based on airflow heating and regeneration method thereof Download PDFInfo
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- CN112090417A CN112090417A CN202010877243.9A CN202010877243A CN112090417A CN 112090417 A CN112090417 A CN 112090417A CN 202010877243 A CN202010877243 A CN 202010877243A CN 112090417 A CN112090417 A CN 112090417A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3416—Regenerating or reactivating of sorbents or filter aids comprising free carbon, e.g. activated carbon
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- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
- B01J20/3458—Regenerating or reactivating using a particular desorbing compound or mixture in the gas phase
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Abstract
The invention discloses a powdered activated carbon regeneration device based on airflow heating and a regeneration method thereof. Due to the nature of powdered activated carbon, thermal regeneration is more difficult than granular activated carbon. The invention comprises a heating section, a reaction section and a recovery section which are sequentially connected end to form a sealed loop. The gas in the heating section, the reaction section and the recovery section can form a gas loop of 'heating section → reaction section → recovery section → heating section' through the gas flow driving device. The heating section is used for heating externally injected gas. The reaction section is provided with a reaction bin with the middle part smaller than the two ends. The reaction bin is provided with a feed inlet. The recovery section separates the gas from the activated carbon powder by a cyclone separator. The method utilizes high-temperature inert gas to sweep the powdered activated carbon, and the gas carries the powdered activated carbon to flow in closed equipment; the high-temperature gas environment can ensure that each grain of powdered carbon is surrounded by high-temperature gas, and the powdered carbon can be rapidly regenerated.
Description
Technical Field
The invention belongs to the technical field of recovery and regeneration of waste powdered activated carbon, and particularly relates to a powdered activated carbon regeneration device based on airflow heating and a regeneration method thereof.
Background
After the activated carbon is used for a period of time, the adsorption is saturated. The powdered activated carbon can be recycled by a regeneration method which is mainly thermal regeneration, like the granular activated carbon. However, due to the characteristics of the powdered activated carbon, compared with granular activated carbon, the thermal regeneration operation difficulty is higher, a large amount of powdered activated carbon is wasted, great pollution is caused to the environment, and a large amount of resources are wasted.
Disclosure of Invention
The invention aims to provide a powdered carbon nitrogen regeneration method capable of avoiding secondary pollution caused by regeneration aiming at the defects of the existing activated carbon regeneration device. The method can be used for rapidly regenerating the waste powdered carbon and simultaneously recovering and treating the tail gas in an integral and sealed environment.
The invention relates to a powdered activated carbon regeneration device based on airflow heating, which comprises a heating section, a reaction section and a recovery section which are sequentially connected end to form a sealed loop. The gas in the heating section, the reaction section and the recovery section can form a gas loop of 'heating section → reaction section → recovery section → heating section' through the gas flow driving device. The heating section is used for heating externally injected gas. The reaction section is provided with a reaction bin with the middle part smaller than the two ends. The reaction bin is provided with a feed inlet. The recovery section separates the gas from the activated carbon powder by a cyclone separator.
Preferably, the reaction chamber is a rotor with two large ends and a small middle. The ratio of the diameter of the two ends of the reaction bin to the diameter of the minimum position in the middle is 1: 5-1: 3.
Preferably, the heating section is cylindrical and comprises an inner cylinder and a heating layer. One end of the inner cylinder is provided with a gas input port and a gas return port, and the other end is provided with a gas output port. The gas inlet of the inner cylinder is connected with an external gas source through a gas pipeline. The gas pipeline is provided with a flow valve.
Preferably, a temperature detecting device is installed inside the inner cylinder. The temperature detecting device is positioned on the side part of the gas output port on the inner cylinder. The heating layer consists of a heating wire wound on the outer side of the inner cylinder; and a heat insulation layer is arranged on the outer side of the heating section.
Preferably, the reaction section comprises a reaction bin, a feeding hopper and an opening and closing valve. One end of the reaction bin is provided with a gas input port, the middle part of the reaction bin is provided with a feed inlet, and the other end of the reaction bin is provided with a regeneration output port. A feeding hopper is arranged at the feeding port in the middle of the reaction bin. An open-close valve is arranged between the feeding hopper and the feeding port on the reaction bin.
Preferably, an inclined feeding channel is arranged between the funnel part of the feeding hopper and the opening and closing valve; the included angle between the axis of the feeding channel and the horizontal plane is 45-60 degrees.
Preferably, the recovery section comprises a cyclone separator and a regenerated powdered carbon collecting bin. The inner cavity of the cyclone separator is divided into an upper cylindrical cavity and a lower conical cavity. A cyclone inlet is arranged at the top of the side surface of the cylindrical cavity; the top center position of cylinder chamber is provided with the gas reflux export. The conical cavity is big end down, and the bottom is provided with collects the mouth. The collecting port at the bottom of the cyclone separator is connected with the regenerated powdered carbon collecting bin. The axis of the cyclone inlet is vertical to and staggered with the central axis of the cyclone separator.
Preferably, the airflow driving device adopts a first centrifugal fan and a second centrifugal fan. The first centrifugal fan is arranged between the reaction section and the recovery section; first centrifugal fan can produce suction to gas and powder in the reaction bin, takes out gas, the powder mixture in the reaction section to the recovery section in. The second centrifugal fan is arranged between the recovery section and the heating section; the second centrifugal fan can generate suction force to the gas and powder in the recovery section. And a flow valve is arranged between the heating section and the reaction section.
Preferably, the recovery section and the heating section are provided with a first exhaust on-off valve; an exhaust outlet is arranged between the first exhaust on-off valve and the recovery section. The exhaust outlet is connected to the exhaust passage. A second exhaust on-off valve is arranged in the exhaust passage. Under the working state, the first exhaust on-off valve is switched on, and the second exhaust on-off valve is switched off; when the gas is led out, the first exhaust on-off valve is closed, the second exhaust on-off valve is opened, and the gas pipeline continuously injects the gas; so that the polluted gas in the heating section, the reaction section and the recovery section is discharged from the exhaust passage.
The activated carbon regeneration method of the powdered activated carbon regeneration device based on airflow heating specifically comprises the following steps:
step one, injecting gas into the heating section, and heating the gas in the heating section.
And step two, adding the activated carbon powder waste into a reaction bin of the reaction section.
And step three, the air flow driving device drives the heated air in the heating section to circularly flow in the heating section, the reaction section and the recovery section, and the air entering the reactor blows the activated carbon powder waste, so that the activated carbon powder waste is lifted and wrapped in a heated air environment for heating and regeneration.
The regenerated waste activated carbon powder enters a cyclone separator in the recovery section along with the airflow of the gas, and a vortex-shaped airflow is generated in the cyclone separator. And (4) sinking and storing the solid-phase activated carbon powder in a cyclone separator. The gas rises and enters the heating section again for heating, and the cycle is repeated.
And step four, when the amount of the regenerated activated carbon powder waste reaches a preset value, gas in the heating section, the reaction section and the recovery section is led out.
The invention has the beneficial effects that:
1. the method comprises the steps of heating inert gas, purging powdered activated carbon by using high-temperature inert gas, and allowing the gas to carry the powdered carbon to flow in a closed device; each grain of powdered carbon can be surrounded by high-temperature gas in the high-temperature gas environment, so that the powdered carbon can be rapidly regenerated, and the powdered activated carbon can be uniformly and fully heated, thereby improving the regeneration effect of the powdered activated carbon.
2. The reaction bin has the advantages that the two ends of the reaction bin are large, the middle of the reaction bin is small, the ratio of the diameter of the two ends to the diameter of the minimum position in the middle of the reaction bin is 1: 5-1: 3, and the venturi tube effect in hydrodynamics is utilized, so that a mixture formed by gas and powdered carbon can flow in a pipeline and cannot be blocked.
3. The invention utilizes the characteristics that the centrifugal force generated when the powdered carbon particles rotate at high speed in airflow is far larger than the gravity, and the centrifugal settling speed obtained by the particles is higher when the speed is higher, so that the gas is separated from the powdered carbon, the gas is circulated, and the powdered carbon enters the collection bin.
4. The invention directly recycles the tail gas, and after regeneration is finished, the heating power supply is closed, and the waste gas is intensively led into the pollutant degradation equipment for harmless treatment, so that the pollution gas can be prevented from escaping.
Drawings
FIG. 1 is a schematic structural view of example 1 of the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
As shown in figure 1, the powdered activated carbon regeneration device based on airflow heating comprises a heating section A, a reaction section B and a recovery section C which are sequentially connected end to form a sealed loop. The heating section A is cylindrical and comprises an inner cylinder 4, a heating layer 5 and a heat-insulating layer which are sequentially sleeved from outside to inside. The inner cylinder 4 is a quartz tube. The heating layer 5 consists of a heating wire wound on the outer side of the inner cylinder 4 and is used for heating the nitrogen in the inner cylinder 4; the heat preservation is used for reducing the heat loss of heating section A, reduces the energy consumption. The temperature detecting device 1 is arranged in the inner cylinder 4; the temperature detection device 1 is used for detecting the temperature inside the inner cylinder 4. One end of the inner cylinder 4 is provided with a gas input port and a gas return port, and the other end is provided with a gas output port. The temperature detection device 1 is positioned at the side of the gas output port on the inner cylinder 4. The temperature measuring device 1 is a K-type nickel-silicon thermocouple. The gas inlet of the inner cylinder 4 is connected with an external nitrogen source through a gas pipeline 12. The gas pipe 12 is provided with a flow valve 14. The flow valve 14 is used to adjust the flow of nitrogen gas into the inner drum 4.
The reaction section B comprises a reaction bin 3, a feeding hopper 6, an opening and closing valve 7 and a first centrifugal fan 9. The reaction chamber 3 is waist drum shaped, namely a rotor with two large ends and a small middle. The ratio of the diameter of the two ends of the reaction bin 3 to the diameter of the minimum position in the middle is 1: 5-1: 3. One end of the reaction bin 3 is provided with a gas input port, the middle part of the reaction bin is provided with a feed inlet, and the other end of the reaction bin is provided with a regeneration output port. A feeding hopper 6 for feeding regenerated activated carbon powder is arranged at a feeding port in the middle of the reaction bin 3. An open-close valve 7 is arranged between the feeding hopper 6 and the feeding port on the reaction chamber 3. The open-close valve 7 is used for controlling whether regenerated activated carbon powder is added or not, and an electric or manual on-off valve is adopted. An inclined feeding channel is arranged between the funnel part of the feeding hopper 6 and the opening and closing valve 7; the included angle between the axis of the feeding channel and the horizontal plane is 45-60 degrees; the first centrifugal fan 9 is installed at the output port of the reaction bin 3 and isolated from the external environment.
The recovery section C comprises a cyclone separator 11, a regenerated powdered carbon collecting bin 13 and a second centrifugal fan 10. The inner cavity of the cyclone separator 11 is divided into an upper cylindrical cavity and a lower conical cavity. A cyclone inlet is arranged at the top of the side surface of the cylindrical cavity; the top center position of cylinder chamber is provided with the gas reflux export. The conical cavity is big end down, and the bottom is provided with collects the mouth. The collecting port at the bottom of the cyclone separator 11 is connected with a regenerated powdered carbon collecting bin 13. The axis of the cyclone inlet is perpendicular to and offset from the central axis of the cyclone 11 so that the nitrogen and powder mixture introduced from the cyclone inlet can swirl inside the cyclone 11. The second centrifugal fan 10 is installed at a gas reflux outlet of the cyclone 11 and is isolated from the external environment.
The gas inlet of the reaction bin 3 is connected with the gas outlet of the inner cylinder 4 through the flow valve 2. The output port of the reaction bin 3 is connected with the cyclone inlet of the cyclone separator 11 through a first centrifugal fan 9. The gas return outlet of the cyclone separator 11 is connected to the gas return inlet of the inner cylinder 4 by a second centrifugal fan 10.
The first centrifugal fan 9 can generate suction force to the gas and powder in the reaction chamber 3. First centrifugal fan 9 can be with the nitrogen gas suction reaction chamber 3 after being heated in the inner tube 4 to in retrieving section C is taken out to nitrogen gas, the powder mixture in the reaction chamber 3.
The second centrifugal fan 10 is capable of generating suction to the gas and powder in the cyclone 11. The powder is used as a solid phase, has larger weight, and sinks in the cyclone to enter the regenerated powdered carbon collecting bin 13; the nitrogen as a gas phase enters the heating section A again for heating under the suction force of the second centrifugal fan 10.
The activated carbon regeneration method of the powdered activated carbon regeneration device based on airflow heating specifically comprises the following steps:
step one, opening a flow valve 14, and injecting nitrogen into a heating section A through a gas pipeline 12; after the amount of injected nitrogen reaches a preset value, closing the flow valve 14; electrifying the heating layer 5 of the heating section A to start to carry out nitrogen gas in the heating section A; detecting the temperature of nitrogen in the heating section A by using a temperature detection device 1; when the temperature of the nitrogen in the heating section A reaches 750-850 ℃, controlling the temperature to be constant at 800 ℃.
And step two, pouring the regenerated activated carbon powder waste into a feeding hopper 6, and opening an opening and closing valve 7 to enable the activated carbon powder waste in the feeding hopper 6 to enter the reactor 3.
Step three, starting the first centrifugal fan 9 and the second centrifugal fan 10 to enable the nitrogen heated in the heating section A to circularly flow in the heating section A, the reaction section B and the recovery section C, and adjusting the flow of the nitrogen to 600 ml/min; the nitrogen gas entering the reactor 3 blows the waste activated carbon powder, so that the waste activated carbon powder flies up and is wrapped in the nitrogen environment at 800 ℃ for heating regeneration.
The regenerated waste activated carbon powder is introduced into a cyclone separator 11 through a first centrifugal fan 9 along with the nitrogen gas flow, and a vortex-shaped gas flow is generated in the cyclone separator 11. The activated carbon powder as a solid phase sinks in the cyclone separator 11 and enters the regenerated powdered carbon collection bin 13. The nitrogen rises as a gas phase, enters the heating section A again through the second centrifugal fan 10 for heating, and repeats in turn to realize the continuous regeneration of the activated carbon powder waste.
Step four, when the amount of the regenerated activated carbon powder waste reaches a preset value, nitrogen in the heating section A, the reaction section B and the recovery section C is led out and sent to pollutant degradation equipment for harmless treatment;
and when the regenerated powdered carbon collection bin 13 is full, the first centrifugal fan 9 and the second centrifugal fan 10 are closed, and the activated carbon powder in the regenerated powdered carbon collection bin 13 is taken out.
Example 2
This example differs from example 1 in that: the structure and the mode of leading out the nitrogen gas are particularly limited.
As shown in fig. 2, a first exhaust on-off valve 15 is arranged between the second centrifugal fan 10 and the gas return outlet of the cyclone separator 11; an exhaust outlet is arranged between the first exhaust on-off valve 15 and the gas return outlet of the cyclone separator 11. The exhaust outlet is connected to a subsequent pollutant degradation device via an exhaust channel. A second exhaust on-off valve 16 is provided in the exhaust passage.
In the working state, the first exhaust on-off valve 15 is turned on, and the second exhaust on-off valve 16 is turned off;
under the state of nitrogen gas export, the first exhaust on-off valve 15 is closed, the second exhaust on-off valve 16 is opened, and the gas pipeline 12 is continuously injected with nitrogen gas; so that the contaminated nitrogen in the heating section A, the reaction section B and the recovery section C is discharged from the exhaust passage.
Example 3
This example differs from example 1 in that: instead of using nitrogen, a gas that does not decompose at 1000 ℃ and does not react with the contaminants adsorbed on the activated carbon powder is used.
Claims (10)
1. The utility model provides a powdered activated carbon regenerating unit based on air current heating which characterized in that: comprises a heating section (A), a reaction section (B) and a recovery section (C) which are sequentially connected end to form a sealed loop; the gas in the heating section (a), the reaction section (B) and the recovery section (C) can form a gas loop of 'the heating section (a) → the reaction section (B) → the recovery section (C) → the heating section (a)', through the gas flow driving device; the heating section (A) is used for heating externally injected gas; a reaction bin (3) with the middle part smaller than the two ends is arranged in the reaction section (B); a feed inlet is arranged on the reaction bin (3); the recovery section (C) separates the gas from the activated carbon powder by means of a cyclone (11).
2. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: the reaction bin (3) is in a shape of a rotary body with two large ends and a small middle part; the ratio of the diameter of the two ends of the reaction bin (3) to the diameter of the minimum position in the middle is 1: 5-1: 3.
3. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: the heating section (A) is cylindrical and comprises an inner cylinder (4) and a heating layer (5); one end of the inner cylinder (4) is provided with a gas input port and a gas return port, and the other end is provided with a gas output port; the gas inlet of the inner cylinder (4) is connected with an external gas source through a gas pipeline (12); the gas pipeline (12) is provided with a flow valve (14).
4. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: a temperature detection device (1) is arranged in the inner cylinder (4); the temperature detection device (1) is positioned at the side part of the gas output port on the inner cylinder (4); the heating layer (5) consists of a heating wire wound on the outer side of the inner cylinder (4); and a heat insulation layer is arranged on the outer side of the heating section (A).
5. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: the reaction section (B) comprises a reaction bin (3), a feeding hopper (6) and an opening and closing valve (7); one end of the reaction bin (3) is provided with a gas input port, the middle part of the reaction bin is provided with a feed inlet, and the other end of the reaction bin is provided with a regeneration output port; a feeding hopper (6) is arranged at a feeding port in the middle of the reaction bin (3); an open-close valve (7) is arranged between the feeding hopper (6) and the feeding port on the reaction bin (3).
6. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: an inclined feeding channel is arranged between the funnel part of the feeding hopper (6) and the opening and closing valve (7); the included angle between the axis of the feeding channel and the horizontal plane is 45-60 degrees.
7. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: the recovery section (C) comprises a cyclone separator (11) and a regenerated powdered carbon collection bin (13); the inner cavity of the cyclone separator (11) is divided into an upper cylindrical cavity and a lower conical cavity; a cyclone inlet is arranged at the top of the side surface of the cylindrical cavity; a gas backflow outlet is formed in the center of the top of the cylindrical cavity; the conical cavity is big at the top and small at the bottom, and a collecting port is arranged at the bottom; a collecting port at the bottom of the cyclone separator (11) is connected with a regenerated powdered carbon collecting bin (13); the axis of the cyclone inlet is vertical to and staggered with the central axis of the cyclone separator (11).
8. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: the airflow driving device adopts a first centrifugal fan (9) and a second centrifugal fan (10); the first centrifugal fan (9) is arranged between the reaction section (B) and the recovery section (C); the first centrifugal fan (9) can generate suction force on the gas and powder in the reaction bin (3) and pump the gas and powder mixture in the reaction section (B) into the recovery section (C); the second centrifugal fan (10) is arranged between the recovery section (C) and the heating section (A); the second centrifugal fan (10) is capable of generating suction to the gas and powder in the recovery section (C); and a flow valve (2) is arranged between the heating section (A) and the reaction section (B).
9. The powdered activated carbon regeneration device based on gas flow heating of claim 1, wherein: the recovery section (C) and the heating section (A) are provided with a first exhaust on-off valve; an exhaust outlet is arranged between the first exhaust on-off valve and the recovery section (C); the exhaust outlet is connected to the exhaust passage; a second exhaust on-off valve is arranged in the exhaust channel; under the working state, the first exhaust on-off valve is switched on, and the second exhaust on-off valve is switched off; when the gas is led out, the first exhaust on-off valve is closed, the second exhaust on-off valve is opened, and the gas pipeline (12) continuously injects the gas; so that the contaminated gas in the heating section (A), the reaction section (B) and the recovery section (C) is discharged from the exhaust passage.
10. The activated carbon regeneration method of a powdered activated carbon regeneration device based on gas stream heating as claimed in claim 1, wherein: injecting gas into the heating section (A), and heating the gas in the heating section (A);
secondly, adding the activated carbon powder waste into a reaction bin (3) of the reaction section (B);
thirdly, the air flow driving device drives the heated air in the heating section (A) to circularly flow in the heating section (A), the reaction section (B) and the recovery section (C), and the air entering the reactor (3) blows the activated carbon powder waste, so that the activated carbon powder waste is lifted and wrapped in a heated air environment for heating and regeneration;
the regenerated activated carbon powder waste material enters a cyclone separator (11) in a recovery section (C) along with the airflow of the gas, and generates a vortex-shaped airflow in the cyclone separator (11); the solid-phase activated carbon powder sinks in a cyclone separator (11) for preservation; the gas rises and enters the heating section (A) again for heating, and the cycle is repeated;
and step four, when the amount of the regenerated activated carbon powder waste reaches a preset value, leading out the gas in the heating section (A), the reaction section (B) and the recovery section (C).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010877243.9A CN112090417B (en) | 2020-08-27 | 2020-08-27 | Powder activated carbon regeneration device based on air flow heating and regeneration method thereof |
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| CN202010877243.9A CN112090417B (en) | 2020-08-27 | 2020-08-27 | Powder activated carbon regeneration device based on air flow heating and regeneration method thereof |
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| CN112090417B (en) | 2023-06-13 |
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