Activated carbon regeneration recycling device and method for exhaust gas treatment

Abstract

The present application relates to a kind of active carbon regeneration circulating device and method for waste gas treatment, it relates to waste gas treatment technical field, including waste gas delivery line and rotary chamber, still including the first active carbon tank, second active carbon tank being connected with waste gas delivery line respectively and the compensation pipeline being connected with the gas outlet end of first active carbon tank and second active carbon tank;Steam delivery line is connected on the first active carbon tank and second active carbon tank, multiple mixing mechanisms are arranged in the first active carbon tank, second active carbon tank and steam delivery line gas outlet end are connected;The gas outlet end of first active carbon tank and second active carbon tank is connected with the desorption gas delivery line being connected with rotary chamber.The first active carbon tank and second active carbon tank are alternately reciprocated in the present application, and it is used to one spare one, seamless switching, using the device to treat waste gas, can reduce downtime, and processing efficiency is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment technology, specifically relating to an activated carbon regeneration and recycling device and method for waste gas treatment. Background Technology

[0002] Currently, the commonly used processes for treating organic waste gas include activated carbon adsorption, absorption, combustion, condensation, and biological methods, as well as some emerging processes such as low-temperature plasma technology and photocatalytic oxidation. Among them, activated carbon adsorption involves entering the waste gas purification tower at room temperature and then entering the activated carbon adsorption tank for adsorption. Because activated carbon adsorption has strong adaptability, it is suitable for the purification of most high-concentration, large-volume, and different organic substances, and is therefore a commonly used treatment method for waste gas.

[0003] However, activated carbon adsorbs a certain amount of solvent after a period of use and should be regenerated. During regeneration, the activated carbon is purged with steam to desorb the adsorbed solvent at high temperature. During the activated carbon regeneration operation, the waste gas treatment equipment needs to be shut down to replace the new activated carbon, which can easily reduce the waste gas treatment efficiency. In response, we propose an activated carbon regeneration and circulation device and method for waste gas treatment. Summary of the Invention

[0004] The purpose of this invention is to provide an activated carbon regeneration and recycling device and method for treating waste gas in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] The present invention provides an activated carbon regeneration and circulation device for waste gas treatment, including a waste gas conveying pipeline and a rotary chamber, and further including a first activated carbon box and a second activated carbon box respectively connected to the waste gas conveying pipeline, and a compensation pipeline connecting the gas outlets of the first activated carbon box and the second activated carbon box. The compensation pipeline is provided with a heating and pressurizing structure, and a steam conveying pipeline is connected to the first activated carbon box and the second activated carbon box.

[0007] Both the first activated carbon box and the second activated carbon box are equipped with multiple mixing mechanisms connected to the steam outlet of the steam conveying pipeline to enhance steam mixing and dispersion.

[0008] The first and second activated carbon boxes are connected to a desorption gas delivery pipeline connected to the rotary chamber at their outlet ends, and a VOCs concentration monitor is installed on the desorption gas delivery pipeline.

[0009] As a further optimization of the present invention, the steam conveying pipeline is connected to a waste heat boiler at its inlet end, and the waste heat boiler is located outside the rotary kiln.

[0010] As a further optimization of the present invention, the first activated carbon box and the second activated carbon box have the same structure. The second activated carbon box includes a box body and an air inlet and an air outlet located at both ends of the box body. The box body is provided with a primary screen near the air inlet, and an activated carbon adsorbent is provided in the middle of the inner cavity of the box body.

[0011] As a further optimization of the present invention, each of the multiple mixing mechanisms includes a cylindrical component, shafts at both ends of the cylindrical component, and fan blades on both sides of the cylindrical component. A bearing seat is rotatably sleeved on one end of the shaft of the cylindrical component. A connecting pipe communicating with a steam conveying pipeline is provided at the upper end of the bearing seat. A channel communicating with the cylindrical component is transversely penetrating inside the fan blade. A sealed bearing is provided on the bearing seat and rotatably sleeved with the shaft. A transmission structure is commonly connected to the shafts at one end of the multiple cylindrical components.

[0012] As a further optimization of the present invention, the outlet ends of the two desorption gas conveying pipelines are connected to a combustion-supporting fan connected to the rotary chamber, and both steam conveying pipelines are equipped with a booster fan.

[0013] As a further optimization of the present invention, the exhaust gas conveying pipeline includes a main pipeline and two branch pipelines connected to the main pipeline, and the two branch pipelines are respectively connected to the air inlet of the first activated carbon box and the second activated carbon box.

[0014] As a further optimization of the present invention, a nitrogen conveying pipeline is also provided on the steam conveying pipeline, and a solenoid valve is provided on the waste gas conveying pipeline, the desorption gas conveying pipeline, the compensation pipeline, the steam conveying pipeline, and the nitrogen conveying pipeline.

[0015] The present invention also provides a method for regenerating and recycling activated carbon for waste gas treatment using any of the apparatuses described above, comprising the following steps:

[0016] S1. The pretreated waste gas is transported to the first activated carbon box / second activated carbon box through the waste gas conveying pipeline for adsorption to obtain desorbed gas. The desorbed gas is then transported to the rotary chamber for incineration through the desorbed gas conveying pipeline.

[0017] S2. When the first activated carbon box / second activated carbon box is saturated with adsorption, control the opening of the compensation pipeline and the steam conveying pipeline connected to the first activated carbon box / second activated carbon box, and control the closing of the waste gas conveying pipeline and the desorption gas conveying pipeline connected to the first activated carbon box / second activated carbon box.

[0018] S3. The desorbed gas remaining in the first activated carbon box / second activated carbon box is heated and pressurized by the heating and pressurizing structure on the compensation pipeline and then transported to the second activated carbon box / first activated carbon box. The waste gas conveying pipeline transports the waste gas to the second activated carbon box / first activated carbon box for adsorption. At the same time, the desorbed gas conveying pipeline connected to the first activated carbon box / second activated carbon box is opened. Steam is transported through the steam conveying pipeline to the mixing mechanism in the first activated carbon box / second activated carbon box for mixing and dispersion, and then used to heat and regenerate the first activated carbon box / second activated carbon box. The waste gas discharged after being purged by steam and nitrogen is transported by the desorbed gas conveying pipeline and blown into the rotary chamber by the combustion fan for combustion.

[0019] The beneficial effects of this invention are as follows:

[0020] (1) The present invention uses the first activated carbon box and the second activated carbon box alternately, so as to achieve one backup and one use, and seamless switching. Using this device to treat waste gas can reduce downtime and greatly improve treatment efficiency.

[0021] (2) The device of the present invention is used to treat waste gas, which reduces the amount of activated carbon used and also reduces the generation of waste activated carbon, thus indirectly achieving an efficient match between resource use and environmental protection requirements. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a diagram showing the internal structure of the second activated carbon box provided by the present invention;

[0024] Figure 3 A schematic diagram of the mixing mechanism provided by the present invention;

[0025] Figure 4 A perspective view of the bearing provided by the present invention;

[0026] In the diagram: 1. First activated carbon box; 2. Second activated carbon box; 21. Box body; 22. Air inlet; 23. Air outlet; 24. Primary screen; 25. Activated carbon adsorbent; 3. Waste gas conveying pipeline; 31. Main pipeline; 32. Branch pipeline; 4. Desorption gas conveying pipeline; 5. Combustion fan; 6. Rotary chamber; 7. Heating and pressurizing structure; 8. Compensation pipeline; 9. VOCs concentration monitor; 10. Waste heat boiler; 11. Booster fan; 12. Steam conveying pipeline; 13. Nitrogen conveying pipeline; 14. Mixing mechanism; 141. Cylindrical component; 142. Shaft; 143. Shaft seat; 144. Fan blade; 145. Channel; 146. Connecting pipe; 147. Sealed bearing; 15. Transmission structure; 16. Solenoid valve. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0028] Example 1

[0029] like Figure 1 As shown, an activated carbon regeneration and circulation device for waste gas treatment includes a waste gas conveying pipeline 3 and a rotary chamber 6, and also includes a first activated carbon box 1 and a second activated carbon box 2 respectively connected to the waste gas conveying pipeline 3, and a compensation pipeline 8 connecting the outlet ends of the first activated carbon box 1 and the second activated carbon box 2. The compensation pipeline 8 is provided with a heating and pressurizing structure 7, and a steam conveying pipeline 12 is connected to the first activated carbon box 1 and the second activated carbon box 2.

[0030] Both the first activated carbon box 1 and the second activated carbon box 2 are equipped with multiple mixing mechanisms 14 connected to the steam outlet of the steam conveying pipeline 12 to enhance steam mixing and dispersion.

[0031] The first activated carbon box 1 and the second activated carbon box 2 are connected to the gas outlets of the desorption gas delivery pipeline 4, which is connected to the rotary chamber 6. The desorption gas delivery pipeline 4 is equipped with a VOCs concentration monitor 9, which is used to monitor the VOCs concentration values ​​of the waste gas before and after adsorption treatment by the first activated carbon box 1 and the second activated carbon box 2.

[0032] The exhaust gas conveying pipeline 3 includes a main pipeline 31 and two branch pipelines 32 connected to the main pipeline 31. The two branch pipelines 32 are respectively connected to the air inlet of the first activated carbon box 1 and the second activated carbon box 2.

[0033] The steam conveying pipeline 12 is also provided with a nitrogen conveying pipeline 13, and the waste gas conveying pipeline 3, the desorption gas conveying pipeline 4, the compensation pipeline 8, the steam conveying pipeline 12 and the nitrogen conveying pipeline 13 are all provided with solenoid valves 16.

[0034] Furthermore, the inlet end of the steam conveying pipeline 12 is connected to a waste heat boiler 10, and the waste heat boiler 10 is located outside the rotary chamber 6. The outlet ends of the two desorption gas conveying pipelines 4 are connected to combustion fans 5 connected to the rotary chamber 6. Both steam conveying pipelines 12 are equipped with booster fans 11. In use, the desorption gas is conveyed through the desorption gas conveying pipeline 4 and sent to the rotary chamber 6 for combustion by the combustion fans 5. The heat generated during combustion in the rotary chamber 6 is recovered by the waste heat boiler 10. The steam generated by the waste heat boiler 10 is pressurized by the booster fans 11 on the steam conveying pipeline 12 and then conveyed to the mixing mechanism 14 in the first activated carbon box 1 / second activated carbon box 2.

[0035] Furthermore, the first activated carbon box 1 and the second activated carbon box 2 have the same structure. The second activated carbon box 2 includes a box body 21 and an air inlet 22 and an air outlet 23 located at both ends of the box body 21. The box body 21 is provided with a primary screen 24 near the air inlet 22 for primary screening of waste gas, and an activated carbon adsorbent 25 is provided in the middle of the inner cavity of the box body 21 for adsorbing and treating waste gas.

[0036] Furthermore, such as Figure 2-4 As shown, each of the multiple mixing mechanisms 14 includes a cylindrical component 141, shafts 142 at both ends of the cylindrical component 141, and fan blades 144 on both sides of the cylindrical component 141. A bearing seat 143 is rotatably sleeved on one end of the shaft 142 of the cylindrical component 141. The upper end of the bearing seat 143 is provided with a connecting pipe 146 that communicates with the steam conveying pipeline 12. A channel 145 that communicates with the cylindrical component 141 is transversely penetrating inside the fan blades 144. A sealed bearing 147 that is rotatably sleeved with the shaft 142 is provided on the bearing seat 143. A transmission structure 15 is connected to the shafts 142 at one end of the multiple cylindrical components 141.

[0037] In use, the transmission structure 15 drives multiple cylindrical parts 141 to rotate synchronously and uniformly, which in turn drives the fan blades 144 on the cylindrical parts 141 to rotate uniformly. The transmission structure 15 can be in the form of a drive motor + pulley set. At the same time, steam is transported through the steam conveying pipeline 12 and flows into the bearing seat 143 on each cylindrical part 141 through the connecting pipe 146. The bearing seat 143 is connected to the cylindrical part 141, so that the steam enters the interior of the cylindrical part 141 and flows out through the channel 145 on each fan blade 144. With the uniform rotation of the fan blade 144, the steam is mixed and dispersed.

[0038] The specific working principle is as follows: The first activated carbon box 1 and the second activated carbon box 2 are used in a standby manner. That is, when the first activated carbon box 1 is used, the branch pipe 32 connected to the second activated carbon box 2 is closed, and vice versa. During the waste gas treatment, the pre-treated waste gas flows into the first activated carbon box 1 through the main pipe 31 and the branch pipe 32 for desorption. The desorbed gas flows from the outlet of the first activated carbon box 1 into the desorbed gas conveying pipe 4, and is then conveyed by the desorbed gas conveying pipe 4 and blown into the rotary chamber 6 by the combustion fan 5 for combustion.

[0039] The heat generated during the incineration operation in the rotary chamber 6 is utilized by the waste heat boiler 10 to heat the water in the boiler and form steam.

[0040] When the first activated carbon box 1 is saturated with adsorption, the specific judgment process is as follows: during the process of the desorbed gas being transported to the rotary chamber 6 through the desorbed gas conveying pipeline 4, the VOCs concentration monitor 9 monitors the VOCs concentration value of the desorbed gas and compares it with the initial VOCs concentration value of the exhaust gas. If the difference between the two values ​​is not large or within the set value range, it is judged that the first activated carbon box 1 is saturated with adsorption. At this time, the regeneration operation of the first activated carbon box 1 is started.

[0041] The regeneration operation of the first activated carbon box 1 is as follows: First, the branch pipe 32 connected to the first activated carbon box 1 is closed to block the entry of the waste gas. The waste gas enters the second activated carbon box 2 through the branch pipe 32 connected to the second activated carbon box 2 to carry out the same adsorption process as described above.

[0042] Simultaneously, the control compensation pipeline 8 and the steam conveying pipeline 12 connected to the first activated carbon box 1 are opened, and the control desorption gas conveying pipeline 4 connected to the first activated carbon box 1 is closed. The desorption gas remaining in the first activated carbon box 1 is heated and pressurized by the heating and pressurizing structure 7 on the compensation pipeline 8 and then conveyed to the second activated carbon box 2. Since the first activated carbon box 1 is in a saturated state, this part of the desorption gas is not completely desorbed. After being heated and pressurized by the heating and pressurizing structure 7, it enters the second activated carbon box 2 through the compensation pipeline 8. While preheating the second activated carbon box 2, it is convectively dispersed with the exhaust gas entering the second activated carbon box 2 through the branch pipeline 32. This part of the desorption gas and the exhaust gas are mixed and then further adsorption treatment is completed in the second activated carbon box 2.

[0043] Meanwhile, the desorption gas conveying pipeline 4 connected to the first activated carbon box 1 is opened. The steam generated by the waste heat boiler 10 is pressurized by the booster fan 11 on the steam conveying pipeline 12 and then conveyed to the mixing mechanism 14 in the first activated carbon box 1 through the steam conveying pipeline 12 for mixing and dispersion to heat and regenerate the first activated carbon box 1. This process takes 2-5 hours, and the steam pressure is 1.0-2.0 MPa. Subsequently, the steam conveying pipeline 12 is closed, and nitrogen gas at 0.25-0.3 MPa is conveyed to the mixing mechanism 14 in the first activated carbon box 1 through the nitrogen conveying pipeline 13 for mixing and dispersion to purge the first activated carbon box 1. This process takes 1-2 hours. Throughout the process, the exhaust gas discharged after steam and nitrogen purging is conveyed by the desorption gas conveying pipeline 4 and blown into the rotary chamber 6 by the combustion blower 5 for combustion. After the entire process is completed, the first activated carbon box 1 is heated and regenerated.

[0044] Similarly, when the second activated carbon box 2 is also saturated, it also completes the heating and regeneration process according to the above operation. The first activated carbon box 1 and the second activated carbon box 2 are used repeatedly, so as to achieve one in reserve and one in use, and seamless switching. Using this device to treat waste gas reduces downtime and greatly improves treatment efficiency.

[0045] Example 2

[0046] This embodiment also provides a method for regenerating and recycling activated carbon for waste gas treatment using any of the devices described above, comprising the following steps:

[0047] S1. The pretreated waste gas is transported to the first activated carbon box 1 / second activated carbon box 2 through the waste gas conveying pipeline 3 for adsorption to obtain desorbed gas. The desorbed gas is transported to the rotary chamber 6 for incineration through the desorbed gas conveying pipeline 4.

[0048] S2. When the first activated carbon box 1 / second activated carbon box 2 is saturated with adsorption, control the compensation pipeline 8 and the steam conveying pipeline 12 connected to the first activated carbon box 1 / second activated carbon box 2 to open, and control the waste gas conveying pipeline 3 and the desorption gas conveying pipeline 4 connected to the first activated carbon box 1 / second activated carbon box 2 to close.

[0049] S3. The desorbed gas remaining in the first activated carbon box 1 / second activated carbon box 2 is heated and pressurized by the heating and pressurizing structure 7 on the compensation pipeline 8 and then transported to the second activated carbon box 2 / first activated carbon box 1. The waste gas conveying pipeline 3 transports the waste gas to the second activated carbon box 2 / first activated carbon box 1 for adsorption. At the same time, the desorbed gas conveying pipeline 4 connected to the first activated carbon box 1 / second activated carbon box 2 is opened. Steam is transported through the steam conveying pipeline 12 to the mixing mechanism 14 in the first activated carbon box 1 / second activated carbon box 2 for mixing and dispersion, and then used to heat and regenerate the first activated carbon box 1 / second activated carbon box 2. The waste gas discharged after steam and nitrogen purging is transported by the desorbed gas conveying pipeline 4 and blown into the rotary chamber 6 by the combustion blower 5 for combustion.

[0050] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. An activated carbon regeneration and circulation device for waste gas treatment, comprising a waste gas conveying pipeline (3) and a rotary chamber (6), characterized in that: It also includes a first activated carbon box (1) and a second activated carbon box (2) respectively connected to the exhaust gas conveying pipeline (3), and a compensation pipeline (8) connecting the exhaust gas boxes (1) and the exhaust gas boxes (2). The compensation pipeline (8) is provided with a heating and pressurizing structure (7), and the first activated carbon box (1) and the second activated carbon box (2) are connected to a steam conveying pipeline (12). Both the first activated carbon box (1) and the second activated carbon box (2) are equipped with multiple mixing mechanisms (14) connected to the outlet of the steam conveying pipeline (12) to enhance steam mixing and dispersion. Each of the multiple mixing mechanisms (14) includes a cylindrical part (141), shafts (142) at both ends of the cylindrical part (141), and fan blades (144) on both sides of the cylindrical part (141). A rotating sleeve is mounted on the shaft (142) at one end of the cylindrical part (141). A bearing seat (143) is provided, and the upper end of the bearing seat (143) is provided with a connecting pipe (146) that communicates with the steam conveying pipeline (12). A channel (145) that communicates with the cylindrical component (141) is transversely passed through the fan blade (144). A sealed bearing (147) that is rotatably sleeved with the shaft (142) is provided on the bearing seat (143). A transmission structure (15) is connected to the shaft (142) at one end of multiple cylindrical components (141). The first activated carbon box (1) and the second activated carbon box (2) are connected to a desorption gas delivery pipeline (4) connected to the rotary chamber (6), and a VOCs concentration monitor (9) is provided on the desorption gas delivery pipeline (4).

2. The activated carbon regeneration and recycling device for waste gas treatment according to claim 1, characterized in that: The steam conveying pipeline (12) is connected to a waste heat boiler (10) at its inlet end, and the waste heat boiler (10) is located outside the rotary chamber (6).

3. The activated carbon regeneration and recycling device for waste gas treatment according to claim 1, characterized in that: The first activated carbon box (1) and the second activated carbon box (2) have the same structure. The second activated carbon box (2) includes a box body (21) and an air inlet (22) and an air outlet (23) located at both ends of the box body (21). The box body (21) is provided with a primary screen (24) near the air inlet (22), and an activated carbon adsorbent (25) is provided in the middle of the inner cavity of the box body (21).

4. The activated carbon regeneration and recycling device for waste gas treatment according to claim 1, characterized in that: The outlet ends of the two desorption gas conveying pipelines (4) are connected to combustion fans (5) connected to the rotary chamber (6), and the two steam conveying pipelines (12) are equipped with booster fans (11).

5. The activated carbon regeneration and recycling device for waste gas treatment according to claim 1, characterized in that: The exhaust gas conveying pipeline (3) includes a main pipeline (31) and two branch pipelines (32) connected to the main pipeline (31). The two branch pipelines (32) are respectively connected to the air inlet of the first activated carbon box (1) and the second activated carbon box (2).

6. The activated carbon regeneration and recycling device for waste gas treatment according to claim 1, characterized in that: The steam conveying pipeline (12) is also provided with a nitrogen conveying pipeline (13), and the waste gas conveying pipeline (3), the desorption gas conveying pipeline (4), the compensation pipeline (8), the steam conveying pipeline (12) and the nitrogen conveying pipeline (13) are all provided with solenoid valves (16).

7. A method for regenerating and recycling activated carbon for waste gas treatment using the apparatus according to any one of claims 1-6, characterized in that: Includes the following steps: S1. The pretreated waste gas is transported through the waste gas conveying pipeline (3) to the first activated carbon box (1) / second activated carbon box (2) for adsorption to obtain desorbed gas. The desorbed gas is transported through the desorbed gas conveying pipeline (4) to the rotary chamber (6) for incineration. S2. When the first activated carbon box (1) / second activated carbon box (2) is saturated with adsorption, control the compensation pipeline (8) and the steam conveying pipeline (12) connected to the first activated carbon box (1) / second activated carbon box (2) to open, and control the waste gas conveying pipeline (3) and the desorption gas conveying pipeline (4) connected to the first activated carbon box (1) / second activated carbon box (2) to close. S3. The desorbed gas remaining in the first activated carbon box (1) / second activated carbon box (2) is heated and pressurized by the heating and pressurizing structure (7) on the compensation pipeline (8) and then transported to the second activated carbon box (2) / first activated carbon box (1). The waste gas transport pipeline (3) transports the waste gas to the second activated carbon box (2) / first activated carbon box (1) for adsorption. At the same time, the desorbed gas transport pipeline (4) connected to the first activated carbon box (1) / second activated carbon box (2) is opened. Steam is transported through the steam transport pipeline (12) to the mixing mechanism (14) in the first activated carbon box (1) / second activated carbon box (2) for mixing and dispersion, and then the first activated carbon box (1) / second activated carbon box (2) is heated and regenerated. The waste gas discharged after steam and nitrogen purging is transported by the desorbed gas transport pipeline (4) and blown into the rotary chamber (6) by the combustion blower (5) for combustion.

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