Activated carbon adsorption box and VOC waste gas purification and recovery system

Abstract

The utility model discloses an active carbon adsorption box and VOC waste gas purification recovery system, including carbon canister, first vent pipe, air inlet pipe and air outlet pipe, inside the carbon canister along the vertical direction is provided with two active carbon layer at interval, forms the first cavity between the two active carbon layer; a second cavity is formed between the upper activated carbon layer and the inner top of the carbon tank, and a third cavity is formed between the lower activated carbon layer and the inner bottom of the carbon tank; the first ventilation pipe penetrates through the two activated carbon layers, and the two ends of the first ventilation pipe are communicated with the second cavity and the third cavity; the air inlet pipe is arranged on the carbon tank and is communicated with the first cavity; and the air outlet pipe is arranged on the carbon tank and is communicated with the second cavity. According to the active carbon adsorption box and the VOC waste gas purification and recovery system provided by the utility model, a two-way flowing mode of air flow is supported through a double-layer active carbon layer structure, so that the adsorption capacity of a single active carbon adsorption box is remarkably improved, and the occupied area of the VOC waste gas purification and recovery system can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to VOC waste gas purification recovery technical field, especially in kind of activated carbon adsorption box and VOC waste gas purification recovery system. BACKGROUND

[0002] Activated carbon adsorption technology is one of the mainstream methods for treating volatile organic compounds (VOC) waste gas, which adsorbs organic pollutants in waste gas through the porous structure of activated carbon, has the characteristics of low cost and wide applicability. However, the traditional single-layer activated carbon adsorption device often needs to replace or regenerate activated carbon frequently due to insufficient adsorption capacity when treating high air volume and high concentration waste gas, resulting in low efficiency and low waste gas treatment capacity.

[0003] To improve the treatment capacity, the existing technology generally adopts the parallel connection of multiple tanks to increase the number of single-layer carbon tanks to improve the treatment capacity. However, this method significantly increases the equipment floor area, making it difficult to meet the needs of compact and efficient treatment equipment in industrial scenarios.

[0004] Therefore, the existing technology needs to be improved and enhanced. UTILITY MODEL CONTENT

[0005] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide an activated carbon adsorption box and a VOC waste gas purification recovery system, aiming to solve the technical problem of low waste gas treatment capacity of the single-layer activated carbon layer in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An activated carbon adsorption box comprises:

[0008] A carbon tank is provided with two layers of activated carbon layers in the vertical direction inside the carbon tank, forming a first cavity between the two layers of activated carbon layers; wherein the second cavity is provided between the upper layer of activated carbon layer and the inner top of the carbon tank, and the third cavity is provided between the lower layer of activated carbon layer and the inner bottom of the carbon tank, or the second cavity is provided between the lower layer of activated carbon layer and the inner bottom of the carbon tank, and the third cavity is provided between the upper layer of activated carbon layer and the inner top of the carbon tank;

[0009] A first ventilation pipe is provided through the two layers of activated carbon layers, and the two ends of the first ventilation pipe communicate with the second cavity and the third cavity;

[0010] An air inlet pipe is provided on the carbon tank and communicates with the first cavity;

[0011] And an air outlet pipe is provided on the carbon tank and communicates with the second cavity.

[0012] Further, a second ventilation pipe is arranged through the third cavity and the active carbon layer close to the third cavity, and the two ends of the second ventilation pipe are communicated with the first cavity and the air inlet pipe.

[0013] Further, the diameter of the second ventilation pipe is larger than that of the first ventilation pipe.

[0014] Further, the top of the first ventilation pipe extends beyond the top plane of the active carbon layer in the upper layer.

[0015] Further, a first control valve is arranged on the air inlet pipe, and a second control valve is arranged on the air outlet pipe.

[0016] Further, two desorption air pipes are arranged, one of which is communicated with the first cavity, and the other of which is communicated with the second cavity, and a third control valve is arranged on each desorption air pipe.

[0017] Further, the carbon tank has a circular or polygonal cross section.

[0018] Further, the outer wall of the carbon tank is covered with a heat preservation layer.

[0019] A VOC waste gas purification and recovery system comprises a first main pipe, a second main pipe and a plurality of active carbon adsorption boxes according to any one of the preceding claims arranged in parallel, the first main pipe is communicated with all the air inlet pipes, and the second main pipe is communicated with all the air outlet pipes.

[0020] Further, all the active carbon adsorption boxes are arranged in multiple columns and two rows in a symmetrical manner, and the two rows of active carbon adsorption boxes are arranged in a mirror image symmetry along the axis of the first main pipe.

[0021] Advantages:

[0022] The active carbon adsorption box has the advantages that: the double-layer active carbon layer structure is vertically spaced, the waste gas is guided to pass through the adsorption in two directions through the first cavity in the middle, a part of the purified gas flows into the second cavity, another part of the purified gas flows into the third cavity, and then the first ventilation pipe is used to guide the purified gas into the second cavity, so that a double-channel parallel processing mechanism is formed, the adsorption capacity of a single tank is significantly improved, a single air outlet pipe is used, the use of air outlet accessories is effectively reduced, and the land occupation area of the single tank is reduced.

[0023] The utility model also provides a VOC waste gas purification and recovery system, and multiple active carbon adsorption boxes are arranged in multiple columns and two rows in a symmetrical manner, a compact arrangement matrix is formed, the overall projection area of the equipment is reduced, and the land occupation area is effectively reduced. DRAWINGS

[0024] Figure 1 The active carbon adsorption box provided by the utility model has the advantages that: Figure 1 ;

[0025] Figure 2 The main sectional view of the active carbon adsorption box provided by the utility model Figure 1 ;

[0026] Figure 3 The plan view of the active carbon adsorption box provided by the utility model

[0027] Figure 4 The structure of the active carbon adsorption box provided by the utility model Figure 2 ;

[0028] Figure 5 The main sectional view of the active carbon adsorption box provided by the utility model Figure 2 ;

[0029] Figure 6 The main sectional view of the active carbon adsorption box provided by the utility model Figure 3 ;

[0030] Figure 7 The main sectional view of the active carbon adsorption box provided by the utility model Figure 4 ;

[0031] Figure 8 The structure of the VOC waste gas purification and recovery system provided by the utility model Figure 1 ;

[0032] Figure 9 The structure of the VOC waste gas purification and recovery system provided by the utility model Figure 2 .

[0033] The drawing mark: active carbon adsorption box 10: carbon tank 1, first cavity 11, second cavity 12, third cavity 13, active carbon layer 2, first ventilation pipe 3, air inlet pipe 4, first control valve 41, air outlet pipe 5, second control valve 51, second ventilation pipe 6, desorption air pipe 7, third control valve 71;

[0034] First main pipe 20;Second main pipe 30;Third main pipe 40;Fourth main pipe 50. Specific implementation

[0035] The utility model provides a kind of active carbon adsorption box and VOC waste gas purification and recovery system, to make the purpose, technical scheme and effect of the utility model more clear, definite, the following referring to drawing and taking example to the utility model further detailed explanation.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0036] In the description of the utility model, it is understood that the terms "upper", "lower", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise stated.

[0037] Please refer to Figures 1 to 7 The utility model provides a kind of activated carbon adsorption box, comprising: carbon tank 1, first ventilation pipe 3, air inlet pipe 4 and air outlet pipe 5;Two layers of activated carbon layers 2 are arranged in the vertical direction in the interior of carbon tank 1 with interval, form the first cavity 11 between two layers of activated carbon layers 2;Wherein, the activated carbon layer 2 located in upper layer is equipped with second cavity 12 between and the inner top of carbon tank 1 and the activated carbon layer 2 located in lower layer is equipped with third cavity 13 between and the inner bottom of carbon tank 1, or the activated carbon layer 2 located in lower layer is equipped with second cavity 12 between and the inner bottom of carbon tank 1 and the activated carbon layer 2 located in upper layer is equipped with third cavity 13 between and the inner top of carbon tank 1;First ventilation pipe 3 penetrates two layers of activated carbon layers 2, and the two ends of this first ventilation pipe 3 are communicated with second cavity 12 and third cavity 13;Air inlet pipe 4 is arranged in carbon tank 1, and is communicated with first cavity 11;Air outlet pipe 5 is arranged on carbon tank 1, and is communicated with second cavity 12.

[0038] Double layers of activated carbon layers 2 are arranged in the interior of carbon tank 1 with interval, form the first cavity 11 in the middle as core shunt area, by flexible configuration the up-down position of second cavity 12 and third cavity 13, support airflow bidirectional flow mode.VOC waste gas to be handled enters first cavity 11 by air inlet pipe 4, and under the action of pressure, simultaneously penetrates upper layer activated carbon layer 2 upwards and lower layer activated carbon layer 2 downwards, forms bidirectional adsorption path, and the purified airflow after penetration enters second cavity 12 and third cavity 13 respectively, wherein the airflow of third cavity 13 flows into second cavity 12 through first ventilation pipe 3 penetrating two activated carbon layers 2, and is finally discharged uniformly by air outlet pipe 5. The parallel processing of double-layer structure significantly improves the single-tank adsorption capacity.

[0039] Wherein, the arrow direction in the drawing is the flow direction of waste gas.

[0040] Carbon tank 1 can flexibly select airflow direction from top to bottom or from bottom to top by the inverted configuration of second cavity 12 and third cavity 13, adapt to the spatial arrangement demand of different working conditions.

[0041] In one implementation, see [reference] Figure 2 , 5 A second cavity 12 is provided between the upper activated carbon layer 2 and the top of the carbon canister 1, and a third cavity 13 is provided between the lower activated carbon layer 2 and the bottom of the carbon canister 1. The exhaust pipe is connected to the second cavity 12 and is located at the top of the carbon canister 1, that is, the airflow flows upward and finally exhausts from the top of the carbon canister 1, which conforms to the natural upward law of hot airflow.

[0042] In another implementation, see Figure 6 , 7 A second cavity 12 is provided between the lower activated carbon layer 2 and the bottom of the carbon canister 1, and a third cavity 13 is provided between the upper activated carbon layer 2 and the top of the carbon canister 1. The exhaust pipe is connected to the second cavity 12 and is located at the bottom of the carbon canister 1, that is, the airflow flows downward and finally exhausts from the bottom of the carbon canister 1.

[0043] To achieve communication between the air inlet pipe 4 and the first cavity 11, the air inlet pipe 4 can be installed in the following two ways:

[0044] For the first installation method, please refer to... Figure 5 , 7 The air inlet pipe 4 is located on the side wall of the charcoal canister 1, and extends directly through the side wall of the charcoal canister 1 into the first cavity 11.

[0045] For the second installation method, please refer to... Figure 2 , 6 It also includes a second ventilation pipe 6 that penetrates the third cavity 13 and the activated carbon layer 2 located near the third cavity 13. The two ends of the second ventilation pipe 6 are connected to the first cavity 11 and the air inlet pipe 4. Preferably, the second cavity 12 is located at the top of the carbon canister 1 and the third cavity 13 is located at the bottom of the carbon canister 1. The air inlet pipe 4 is located at the bottom of the carbon canister 1, and the second ventilation pipe 6 penetrates the third cavity 13 and the activated carbon layer 2 located below. The exhaust gas enters the first cavity 11 after passing through the air inlet pipe 4 and the second ventilation pipe 6. Since the air inlet pipe 4 is located below the carbon canister 1, it can effectively reduce the floor space occupied by the carbon canister 1.

[0046] It should be noted that the inlet duct 4 and outlet duct 5 can be interchanged; in this case, the flow path of the exhaust gas is opposite to the direction of the arrow in the diagram. Figure 2 Taking the structure as a reference, after the VOC waste gas to be treated enters the second cavity 12, under the action of pressure, the waste gas penetrates downward through the upper activated carbon layer 2 and enters the third cavity 13 through the first ventilation pipe 3 to form a two-way adsorption path; the purified airflow that penetrates the upper activated carbon layer 2 enters the first cavity 11; the waste gas in the third cavity 13 penetrates upward through the lower activated carbon layer 2, and the purified airflow after penetration enters the first cavity 11 and is finally discharged through the second ventilation pipe 6.

[0047] Further, referring to Figure 2 , 3 , the pipe diameter of the second ventilation pipe 6 is larger than that of the first ventilation pipe 3. The large pipe diameter design of the second ventilation pipe 6 ensures the uniform distribution of exhaust gas between the double-layer activated carbon layers 2, and can provide sufficient exhaust gas into the first cavity 11, so that the two layers of activated carbon layers 2 are fully utilized.

[0048] In a preferred embodiment, referring to Figure 2 , 5 , the top of the first ventilation pipe 3 extends above the top plane of the upper activated carbon layer 2; similarly, the top of the second ventilation pipe 6 extends above the top plane of the lower activated carbon layer 2. Through the above arrangement, not only the smoothness of the air duct in the ventilation pipe is maintained, but also the particles of the activated carbon layer 2 are effectively prevented from entering the first ventilation pipe 3 and the second ventilation pipe 6 due to vibration or air flow impact, and falling down to cause blockage, thereby improving the stability of the equipment operation.

[0049] In a preferred embodiment, referring to Figure 1 , 2 , 4, 5, the first control valve 41 is arranged on the air inlet pipe 4, and the second control valve 51 is arranged on the air outlet pipe 5. Through the double-valve linkage control, the precise start-stop of the adsorption working mode and the dynamic management of the multi-tank cooperative operation are realized. In the exhaust gas treatment stage, the first control valve 41 is opened to introduce the exhaust gas and adjust the air inlet flow, and the second control valve 51 is adjusted to control the exhaust rate of the purified gas flow, so as to ensure the pressure balance between the double-layer activated carbon layers 2 and avoid the fluctuation of adsorption efficiency caused by uneven air distribution.

[0050] In a preferred embodiment, referring to Figure 1 , 2 , 4, 5, it further comprises two desorption air pipes 7, one of which is in communication with the first cavity 11, and the other of which is in communication with the second cavity 12, and each desorption air pipe 7 is provided with a third control valve 71. High-temperature nitrogen gas is introduced into one of the desorption air pipes 7, and the high-temperature nitrogen gas desorbs the saturated activated carbon, and the high-temperature nitrogen gas containing VOC is discharged from the other desorption air pipe 7. Through the double-valve linkage control, the precise start-stop of the desorption working mode and the dynamic management of the multi-tank cooperative operation are realized. When the activated carbon reaches the saturation of adsorption and needs to be switched to the regeneration mode, the first control valve 41 and the second control valve 51 are closed to block the input and output of the exhaust gas, and the two third control valves 71 are opened, so as to realize the efficient switching of the adsorption-regeneration mode.

[0051] Through the above arrangement, not only the independent controllability of single-tank operation is strengthened, but also in the system with multiple activated carbon adsorption tanks 10 in parallel, the working states of the tank control valves can be differentiated and regulated, the alternate operation of partial tank adsorption and partial regeneration is realized, the continuous operation of the system is ensured, and the energy waste is reduced.

[0052] Preferably, the desorption duct 7 connected to the second cavity 12 is used to introduce high-temperature nitrogen gas into the second cavity 12, and the desorption duct 7 connected to the first cavity 11 is used to discharge high-temperature nitrogen gas containing VOCs. After entering the second cavity 12, the hot nitrogen gas penetrates the activated carbon layer 2 along the opposite path to the adsorption of waste gas. Utilizing the dynamic concentration gradient formed by the reverse airflow, the VOC molecules adsorbed in the pores of the activated carbon are forced to desorb more quickly. This countercurrent regeneration mechanism not only improves the desorption efficiency through reverse airflow scouring but also prevents the desorbed pollutants from being re-adsorbed onto the activated carbon, preventing secondary pollution and ensuring the high efficiency and environmental safety of the desorption process.

[0053] In addition, with Figure 2 For structural reference, high-temperature nitrogen can also enter from the desorption duct 7 connected to the first cavity 11 and exit from the desorption duct 7 connected to the second cavity 12, forming a flow path in the same direction as the adsorption of waste gas. During desorption in the same direction, the high-temperature nitrogen flows to the upper and lower activated carbon layers 2, and its heat is evenly radiated to both sides. Moreover, the contact area with the wall of the carbon canister 1 is small, which can reduce heat loss. In addition, the high-temperature nitrogen flows upward, which conforms to the natural upward law of hot air flow.

[0054] In a preferred embodiment, see [reference] Figure 1 , 3 The cross-section of the carbon canister 1 is circular or polygonal to improve its structural strength. Preferably, the cross-section of the carbon canister 1 is a regular polygon. The symmetrical geometry of the regular polygon can evenly distribute the internal air pressure load, significantly enhancing the overall deformation resistance of the carbon canister 1. In addition, the regular polygonal carbon canister 1 can be quickly positioned and installed through standardized facets.

[0055] In a preferred embodiment, the outer peripheral wall of the charcoal canister 1 is covered with an insulation layer, which maintains the dynamic thermal balance of the internal waste gas treatment environment by blocking heat exchange between the inside and outside of the canister. At the same time, it also provides heat insulation for the waste gas inside the charcoal canister 1, which is conducive to the reuse of waste heat in subsequent processes, realizing the synergistic optimization of heat energy recovery and system energy consumption, and constructing an energy-saving thermal cycle system for waste gas treatment.

[0056] See Figure 8 , 9 This utility model also provides a VOC waste gas purification and recovery system, including: a first main pipe 20, a second main pipe 30, and a plurality of activated carbon adsorption boxes 10 arranged in parallel. The first main pipe 20 is connected to all the air inlet pipes 4, and the second main pipe 30 is connected to all the air outlet pipes 5. In actual operation, multiple activated carbon adsorption boxes 10 are in adsorption mode, while a small number of activated carbon adsorption boxes 10 are in desorption mode, realizing alternating adsorption and regeneration operations, ensuring continuous system operation while reducing energy waste.

[0057] In addition, under the premise of handling the same air volume, compared with the existing technology, by increasing the exhaust gas treatment capacity of a single activated carbon adsorption box 10, the number of activated carbon adsorption boxes 10 can be reduced, thereby effectively reducing the floor space and achieving synergistic optimization of exhaust gas treatment efficiency and space utilization.

[0058] Specifically, it also includes a third main pipe 40 and a fourth main pipe 50. The third main pipe 40 is connected to a desorption duct 7 that is uniformly arranged and used to introduce high-temperature nitrogen gas, and the fourth main pipe 50 is connected to the same desorption duct 7 that is used to discharge high-temperature nitrogen gas containing VOCs. In the activated carbon adsorption box 10 in adsorption mode, the first control valve 41 and the second control valve 51 of the activated carbon adsorption box 10 are open, and the third control valve 71 is closed. The VOC waste gas to be treated flows evenly through the first main pipe 20 to the air inlet pipe 4 of each activated carbon adsorption box 10. After being adsorbed and purified by the double-layer activated carbon layer 2, it is discharged into the second main pipe 30 through the air outlet pipe 5. When the activated carbon adsorption is saturated, it switches to desorption mode. The two third control valves 71 of the activated carbon adsorption box 10 are opened, and the first control valve 41 and the second control valve 51 are closed. High-temperature nitrogen gas is introduced through the third main pipe 40 and passes through the activated carbon layer 2 in reverse, carrying the desorbed VOC components to the fourth main pipe 50 for recovery, forming an adsorption-regeneration dynamic balance. The continuous operation of waste gas treatment is ensured by using a mechanism of alternating operation of multiple activated carbon adsorption boxes.

[0059] In a preferred embodiment, see [reference] Figure 8 , 9 All activated carbon adsorption boxes 10 are symmetrically distributed in two rows, with the two rows of activated carbon adsorption boxes 10 arranged mirror-symmetrically along the axis of the first main pipe 20, forming a compact layout matrix. This symmetrical layout reduces the overall projected area of ​​the equipment, optimizing the utilization of production space while ensuring processing capacity, and effectively reducing the floor space required.

[0060] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. An activated carbon adsorption box, characterized in that, include: The charcoal canister (1) has two layers of activated carbon (2) arranged vertically inside, forming a first cavity (11) between the two layers of activated carbon (2); wherein, a second cavity (12) is provided between the upper activated carbon layer (2) and the top of the charcoal canister (1) and a third cavity (13) is provided between the lower activated carbon layer (2) and the bottom of the charcoal canister (1), or a second cavity (12) is provided between the lower activated carbon layer (2) and the bottom of the charcoal canister (1) and a third cavity (13) is provided between the upper activated carbon layer (2) and the top of the charcoal canister (1); A first ventilation pipe (3) is provided through two layers of activated carbon (2), and the two ends of the first ventilation pipe (3) are connected to the second cavity (12) and the third cavity (13). An air inlet pipe (4) is installed on the carbon canister (1) and communicates with the first cavity (11); And an air outlet pipe (5) installed on the charcoal canister (1) and connected to the second cavity (12).

2. The activated carbon adsorption box according to claim 1, characterized in that, It also includes a second ventilation pipe (6) that runs through the third cavity (13) and the activated carbon layer (2) located near the third cavity (13), the two ends of which are connected to the first cavity (11) and the air inlet pipe (4).

3. The activated carbon adsorption box according to claim 2, characterized in that, The diameter of the second ventilation pipe (6) is larger than that of the first ventilation pipe (3).

4. The activated carbon adsorption box according to claim 1 or 2, characterized in that, The top extension height of the first ventilation duct (3) exceeds the top plane of the activated carbon layer (2) located above.

5. The activated carbon adsorption box according to claim 1 or 2, characterized in that, The air inlet pipe (4) is provided with a first control valve (41), and the air outlet pipe (5) is provided with a second control valve (51).

6. The activated carbon adsorption box according to claim 1 or 2, characterized in that, It also includes two desorption ducts (7), one of which is connected to the first cavity (11) and the other is connected to the second cavity (12). Each desorption duct (7) is equipped with a third control valve (71).

7. The activated carbon adsorption box according to claim 1 or 2, characterized in that, The cross-section of the charcoal canister (1) is circular or polygonal.

8. The activated carbon adsorption box according to claim 1 or 2, characterized in that, The outer peripheral wall of the charcoal canister (1) is covered with a heat insulation layer.

9. A VOC waste gas purification and recovery system, characterized in that, include: The first main pipe (20), the second main pipe (30), and several activated carbon adsorption boxes (10) as described in any one of claims 1-8 are arranged in parallel. The first main pipe (20) is connected to all the air inlet pipes (4), and the second main pipe (30) is connected to all the air outlet pipes (5).

10. The VOC waste gas purification and recovery system according to claim 9, characterized in that, All the activated carbon adsorption boxes (10) are symmetrically distributed in two rows and multiple columns. The two rows of activated carbon adsorption boxes (10) are arranged in a mirror symmetrical arrangement along the axis of the first main pipe (20).

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