CN112090417A - Powdered activated carbon regeneration device based on airflow heating and regeneration method thereof - Google Patents

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

A kind of powder activated carbon regeneration device and regeneration method based on airflow heating

technical field

The invention belongs to the technical field of recycling and regeneration of waste powder activated carbon, in particular to a powder activated carbon regeneration device based on airflow heating and a regeneration method thereof.

Background technique

After the activated carbon is used for a period of time, the adsorption will be saturated. Powder activated carbon, like granular activated carbon, can also be recycled through regeneration, and the regeneration method is mainly thermal regeneration. However, due to the characteristics of powder activated carbon itself, compared with granular activated carbon, thermal regeneration is more difficult, resulting in a large amount of powder activated carbon waste, which not only causes great pollution to the environment, but also leads to a lot of waste of resources.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a nitrogen regeneration method for powder carbon that can avoid secondary pollution caused by regeneration, aiming at the deficiencies of the existing activated carbon regeneration device. The method rapidly regenerates the waste powdered carbon in an integral and sealed environment, and simultaneously recycles the exhaust gas.

The present invention is a powder activated carbon regeneration device based on airflow heating, which comprises a heating section, a reaction section and a recovery section which are connected end to end in sequence 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 to heat the externally injected gas. The reaction section is provided with a reaction chamber whose middle size is smaller than the size of both ends. The reaction chamber is provided with a feeding port. The recovery section separates the gas from the activated carbon powder through a cyclone separator.

Preferably, the reaction chamber is in the shape of a revolving body with large ends and a small middle. The ratio of the diameter of the two ends of the reaction chamber to the diameter of the smallest part in the middle is 1:5 to 1:3.

Preferably, the heating section is cylindrical and includes 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 input port of the inner cylinder is connected with the external gas source through a gas pipeline. A flow valve is arranged on the gas pipeline.

Preferably, a temperature detection device is installed inside the inner cylinder. The temperature detection device is located on the side of the gas outlet on the inner cylinder. The heating layer is composed of heating wires wound on the outer side of the inner cylinder; the outer side of the heating section is provided with a thermal insulation layer.

Preferably, the reaction section includes a reaction chamber, a feeding hopper and an on-off valve. One end of the reaction chamber is provided with a gas input port, the middle part is provided with a feeding port, and the other end is provided with a regeneration output port. A feeding hopper is arranged at the feeding port in the middle of the reaction chamber. An on-off valve is arranged between the feeding hopper and the feeding port on the reaction chamber.

Preferably, an inclined feeding channel is provided 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°.

Preferably, the recovery section includes a cyclone separator and a collection bin for regenerated powdered carbon. The inner cavity of the cyclone separator is divided into an upper cylindrical cavity and a lower conical cavity. A cyclone inlet is arranged on the top of the side surface of the cylindrical cavity; a gas return outlet is arranged at the center of the top of the cylindrical cavity. The conical cavity is large at the top and small at the bottom, and a collection port is arranged at the bottom. The collection port at the bottom of the cyclone separator is connected with the regenerated powder carbon collection bin. The axis of the cyclone inlet is perpendicular to and staggered from 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; the first centrifugal fan can generate suction for the gas and powder in the reaction chamber, and pump the gas and powder mixture in the reaction section into the recovery section. The second centrifugal fan is arranged between the recovery section and the heating section; the second centrifugal fan can generate suction for the gas and powder in the recovery section. 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 provided 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. In the working state, the first exhaust on-off valve is turned on, and the second exhaust on-off valve is off; in the state of exporting gas, the first exhaust on-off valve is off, the second exhaust on-off valve is turned on, and the gas pipeline The gas is continuously injected; 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 powder activated carbon regeneration device based on airflow heating is as follows:

Step 1: inject gas into the heating section, and heat the gas in the heating section.

Step 2: Add the activated carbon powder waste into the reaction chamber of the reaction section.

Step 3: The air flow driving device drives the heated gas in the heating section to circulate in the heating section, the reaction section and the recovery section, and the gas entering the reactor blows the activated carbon powder waste, so that the activated carbon powder waste is lifted up and wrapped in the passing process. Heating regeneration is carried out in a heated gas environment.

After the activated carbon powder waste is regenerated, it enters the cyclone separator in the recovery section along with the gas flow, and generates a swirling gas flow in the cyclone separator. The solid-phase activated carbon powder is deposited in a cyclone separator. The gas rises and re-enters the heating section for heating, and so on.

Step 4: When the amount of the regenerated activated carbon powder waste reaches the preset value, the gas in the heating section, the reaction section and the recovery section is exported.

The beneficial effects that the present invention has are:

1. The present invention uses a high-temperature inert gas to purge the powdered activated carbon by heating the inert gas, and the gas carries the powdered carbon in a closed device; the high-temperature gas environment can make each powdered carbon The powdered carbon can be regenerated quickly, and the powdered activated carbon can receive uniform and sufficient heating, thereby improving the regeneration effect of the powdered activated carbon.

2. The two ends of the reaction chamber in the present invention are large in the middle and small in the middle, and the ratio of the diameter of the two ends to the diameter of the smallest part in the middle is 1:5 to 1:3. The Venturi effect in fluid mechanics can be used to make the gas and powder. The mixture of charcoal can flow in the pipes without clogging.

3. The present invention utilizes the feature that the centrifugal force generated by the powder carbon particles when they rotate at a high speed in the airflow is far greater than the gravity, and the greater the speed, the greater the centrifugal sedimentation speed obtained by the particles, so that the gas is separated from the powder carbon, and the gas is circulated. , the powdered carbon enters the collection bin.

4. The present invention directly recycles and reuses the exhaust gas. When the regeneration is completed, the heating power is turned off, and the exhaust gas is concentratedly introduced into the pollutant degradation equipment for harmless treatment, which can prevent the pollution gas from escaping.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

Example 1

As shown in Figure 1, a powder activated carbon regeneration device based on airflow heating includes a heating section A, a reaction section B and a recovery section C that are connected end to end to form a sealed loop. The heating section A is cylindrical, and includes an inner cylinder 4, a heating layer 5 and a thermal insulation layer that are sequentially sheathed from outside to inside. The inner cylinder 4 adopts a quartz tube. The heating layer 5 is composed of heating wires wound on the outside of the inner cylinder 4, and is used to heat the nitrogen gas in the inner cylinder 4; the thermal insulation layer is used to reduce the heat dissipation of the heating section A and reduce the energy consumption. A temperature detection device 1 is installed inside the inner cylinder 4 ; the temperature detection device 1 is used to detect 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 located on the side of the gas outlet on the inner cylinder 4 . The temperature measuring device 1 is a K-type nickel-silicon thermocouple. The gas input port of the inner cylinder 4 is connected with the external nitrogen source through the gas pipeline 12 . The gas pipeline 12 is provided with a flow valve 14 . The flow valve 14 is used to adjust the flow rate of nitrogen gas input into the inner cylinder 4 .

The reaction section B includes a reaction chamber 3 , a feeding hopper 6 , an on-off valve 7 and a first centrifugal fan 9 . The reaction chamber 3 is in the shape of a waist drum, that is, the shape of a revolving body that is large at both ends and small in the middle. The ratio of the diameter of the two ends of the reaction chamber 3 to the diameter of the smallest part in the middle is 1:5 to 1:3. One end of the reaction chamber 3 is provided with a gas input port, the middle part is provided with a feeding port, and the other end is provided with a regeneration output port. A feeding hopper 6 for feeding the regenerated activated carbon powder is provided at the feeding port in the middle of the reaction chamber 3 . An on-off valve 7 is provided between the feeding hopper 6 and the feeding port on the reaction chamber 3 . The on-off valve 7 is used to control whether to add the regenerated activated carbon powder, and an electric or manual on-off valve is used. 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°; the first centrifugal fan 9 is installed at the output port of the reaction chamber 3 , and isolated from the external environment.

The recovery section C includes a cyclone separator 11 , a collection bin 13 of regenerated powdered carbon and a second centrifugal fan 10 . The inner cavity of the cyclone 11 is divided into an upper cylindrical cavity and a lower conical cavity. A cyclone inlet is arranged on the top of the side surface of the cylindrical cavity; a gas return outlet is arranged at the center of the top of the cylindrical cavity. The conical cavity is large at the top and small at the bottom, and a collection port is arranged at the bottom. The collection port at the bottom of the cyclone separator 11 is connected to the regenerated powdered carbon collection bin 13 . The axis of the cyclone inlet is perpendicular to and staggered from the central axis of the cyclone separator 11 , so that the nitrogen and powder mixture input from the cyclone inlet can swirl inside the cyclone separator 11 . The second centrifugal fan 10 is installed at the gas return outlet of the cyclone separator 11 and is isolated from the external environment.

The gas input port of the reaction chamber 3 is connected with the gas output port on the inner cylinder 4 through the flow valve 2 . The output port of the reaction chamber 3 is connected with the cyclone inlet of the cyclone separator 11 through the first centrifugal fan 9 . The gas return outlet of the cyclone 11 is connected to the gas return outlet of the inner cylinder 4 through the second centrifugal fan 10 .

The first centrifugal fan 9 can generate suction for the gas and powder in the reaction chamber 3 . The first centrifugal fan 9 can pump the heated nitrogen in the inner cylinder 4 into the reaction chamber 3, and pump the nitrogen and powder mixture in the reaction chamber 3 into the recovery section C.

The second centrifugal fan 10 can generate suction for the gas and powder in the cyclone 11 . The powder, as a solid phase, has a large weight and sinks into the regenerated powder carbon collection bin 13 in the cyclone; nitrogen as a gas phase re-enters the heating section A for heating under the suction of the second centrifugal fan 10 .

The activated carbon regeneration method of the powder activated carbon regeneration device based on airflow heating is as follows:

Step 1. Open the flow valve 14, and inject nitrogen into the heating section A through the gas pipeline 12; after the injected nitrogen amount reaches the preset value, close the flow valve 14; Nitrogen; use the temperature detection device 1 to detect the nitrogen temperature in the heating section A; when the nitrogen temperature in the heating section A reaches 750-850 °C, control the temperature to be constant at 800 °C.

Step 2: Pour the regenerated activated carbon powder waste into the feeding hopper 6 , and open the on-off valve 7 , so that the activated carbon powder waste in the feeding hopper 6 enters the reactor 3 .

Step 3, the first centrifugal fan 9 and the second centrifugal fan 10 are started, so that the nitrogen after heating in the heating section A circulates in the heating section A, the reaction section B, and the recovery section C, and the flow rate of the adjusted nitrogen is 600ml/min; The nitrogen gas entering the reactor 3 blows up the activated carbon powder waste, which makes the activated carbon powder waste fly up and is wrapped in a nitrogen atmosphere of 800° C. for heating and regeneration.

After the activated carbon powder waste is regenerated, it enters the cyclone separator 11 through the first centrifugal fan 9 with the flow of nitrogen, and generates a vortex-like airflow in the cyclone separator 11 . The activated carbon powder sinks in the cyclone separator 11 as a solid phase and enters the regenerated powdered carbon collection bin 13 . Nitrogen rises as a gas phase, and re-enters the heating section A through the second centrifugal fan 10 for heating, and the cycle goes back and forth to achieve continuous regeneration of the activated carbon powder waste.

Step 4: When the amount of the regenerated activated carbon powder waste reaches the preset value, the nitrogen gas in the heating section A, the reaction section B and the recovery section C is exported, and sent to the pollutant degradation equipment for harmless treatment;

When the regenerated powder carbon collection bin 13 is full, the first centrifugal fan 9 and the second centrifugal fan 10 are turned off, and the activated carbon powder in the regenerated powder carbon collection bin 13 is taken out.

Example 2

The difference between this embodiment and Embodiment 1 is that the structure and manner of deriving nitrogen gas are specifically limited.

As shown in FIG. 2 , a first exhaust on-off valve 15 is provided between the second centrifugal fan 10 and the gas return outlet of the cyclone 11 ; the first exhaust on-off valve 15 and the gas return outlet of the cyclone 11 An exhaust outlet is provided in between. The exhaust outlet is connected to a subsequent pollutant degradation device through an exhaust passage. 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 off;

In the state of exporting nitrogen, the first exhaust on-off valve 15 is turned off, the second exhaust on-off valve 16 is turned on, and nitrogen is continuously injected into the gas pipeline 12; Nitrogen is discharged from the exhaust passage.

Example 3

The difference between this embodiment and Embodiment 1 is that nitrogen is not used, but a gas that does not decompose within 1000° C. and does not react with the pollutants adsorbed by 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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