Molecular sieve VOCs adsorption treatment device

Abstract

The invention provides a molecular sieve VOCs (volatile organic compounds) adsorption treatment device, which belongs to the technical field of environmental protection and comprises an adsorption tower body, the top end of the adsorption tower body is connected with a gas inlet pipe, and the bottom of an inner cavity is a gas collection cavity. The cyclone flow equalizing assembly is arranged at the top in the adsorption tower body, extends to the gas inlet pipe and is used for uniformly distributing the waste gas after cyclone flow; each layer of the molecular sieve adsorption unit comprises a plurality of molecular sieve adsorption assemblies which are independently distributed in the circumferential direction; the separation flow guide assembly is arranged in the adsorption tower body and is used for separating each layer of molecular sieve adsorption assembly and controlling the air inlet pipe to be uniformly communicated with half of the molecular sieve adsorption assembly in each layer in a staggered manner; the gas collection and desorption assembly is arranged at the lower part of the adsorption tower body and is used for conveying high-temperature hot air to the gas collection cavity; and the controllable exhaust assembly is arranged on the adsorption tower body and is used for controlling gas exhausted from the top of the tower body and in the gas collection cavity. The device is high in adsorption and desorption efficiency and convenient to operate and maintain, and continuous, stable and efficient treatment of VOCs waste gas can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental protection, more particularly, to a molecular sieve VOCs adsorption treatment device. BACKGROUND

[0002] As one of the main atmospheric pollutants, the emission control and treatment of VOCs has become a key research direction in the field of environmental protection. The molecular sieve adsorption method has become one of the mainstream technologies for industrial VOCs waste gas treatment due to its high adsorption efficiency and renewable material advantages, and the related molecular sieve VOCs adsorption treatment device is widely used in chemical, coating, printing and other industries. The molecular sieve VOCs adsorption treatment device in the prior art mostly adopts a whole filler bed or a drawer type adsorption unit structure, and the adsorption tower body is mostly designed as a straight cylinder. After simple flow guiding, the waste gas directly enters the adsorption area, which is prone to uneven gas flow distribution and local flow deviation, resulting in insufficient contact between the molecular sieve adsorption material and the waste gas, which not only reduces the overall adsorption efficiency, but also easily causes the rapid saturation of the local adsorption material, affecting the treatment effect and service life of the device.

[0003] At the same time, the adsorption and desorption processes of the existing molecular sieve adsorption treatment device mostly adopt the whole tower switching mode, and the adsorption unit does not have an interlaced working design. Moreover, the gas flow guiding and discharge control structure is relatively simple, and it is difficult to realize efficient collaborative operation of adsorption and desorption. Although some devices are provided with a desorption regeneration structure, the controllability of hot air transportation is poor, the molecular sieve regeneration is insufficient, and in addition, there is no special collection and cleaning structure for impurities inside the device, which easily causes impurities to accumulate and block the gas flow channel, further affecting the adsorption and desorption efficiency. In addition, the molecular sieve adsorption unit of the traditional device is mostly designed as a whole, which is difficult to disassemble and maintain, and also limits the continuous stable operation and actual application effect of the device.

[0004] Therefore, in view of the above status, it is urgent to develop a molecular sieve VOCs adsorption treatment device to overcome the deficiencies in current actual applications. SUMMARY

[0005] The present application aims to provide a molecular sieve VOCs adsorption treatment device, which aims to solve the problems mentioned in the background.

[0006] The present application is implemented as follows: a molecular sieve VOCs adsorption treatment device, comprising an adsorption tower body, a gas inlet pipe connected to the top end of the adsorption tower body, a gas collection cavity at the bottom of the inner cavity of the adsorption tower body, and a sediment pipe connected to the bottom end of the adsorption tower body, wherein a sealing cover is detachably installed at the lower end of the sediment pipe; further comprising: A cyclone flow equalization assembly is installed at the inner top of the adsorption tower body and extends into the gas inlet pipe, which is used to evenly distribute the waste gas after forming a cyclone; The molecular sieve adsorption unit is installed in the adsorption tower body, each layer of the molecular sieve adsorption unit comprises a plurality of molecular sieve adsorption assemblies distributed independently in a circumferential direction; The separation and flow guide assembly is installed in the adsorption tower body, and is used for separating the plurality of molecular sieve adsorption assemblies in each layer and controlling the uniform staggered communication of the gas inlet pipe with the molecular sieve adsorption assemblies in each layer. The gas collection and desorption assembly is installed in the lower part of the adsorption tower body, and is used for conveying high-temperature hot air to the gas collection cavity. The controllable exhaust assembly is installed on the adsorption tower body, and is used for controlling the exhaust of the gas in the top of the adsorption tower body and the gas in the gas collection cavity.

[0007] Optionally, the separation and flow guide assembly comprises a central cylinder coaxially arranged in the middle of the inner side of the adsorption tower body and corresponding to each layer of the molecular sieve adsorption unit, a plurality of separation plates are fixed in a circumferential direction on the outer side of the central cylinder, and the outer end of the separation plate is fixedly connected with the inner wall of the adsorption tower body; a rotating shaft is coaxially arranged in the middle of the inner side of the adsorption tower body, the rotating shaft is rotationally connected with the central cylinder, the lower end of the lowermost central cylinder is fixedly connected with a motor for driving the rotating shaft to rotate; the upper side of each layer of the molecular sieve adsorption unit is provided with a reversing baffle, the middle part of the reversing baffle is fixedly connected with the rotating shaft, and the outer ring of the reversing baffle is rotationally connected with the inner wall of the adsorption tower body.

[0008] Optionally, the molecular sieve adsorption assembly comprises a carrier box in the shape of a sector and having an opening at the top, the bottom of the carrier box is provided with a mesh plate, the carrier box is filled with molecular sieve adsorption filler, and the outer end of the carrier box is fixedly connected with a push-pull handle; a carrier box inlet and outlet is formed in the side wall of the adsorption tower body for the carrier box to enter and exit; when the inner end of the carrier box abuts against the surface of the central cylinder, the side wall of the carrier box is sealingly abutted against the separation plate, and the outer end of the carrier box is sealingly connected with the mouth wall of the carrier box inlet and outlet.

[0009] Optionally, the molecular sieve adsorption filler is a gradient pore size molecular sieve mixture, which is mixed by large-pore-size molecular sieve particles and small-pore-size molecular sieve particles at a volume ratio of 1:2-3, the pore size of the large-pore-size molecular sieve particles is 5-10 nm, and the pore size of the small-pore-size molecular sieve particles is 2-3 nm; the molecular sieve adsorption filler is subjected to high-temperature activation pretreatment by being activated at a high temperature of 200-250 DEG C for 2-3 h under vacuum before being filled.

[0010] Optionally, the swirl equalization assembly includes a porous equalization plate fixed to the top of the adsorption tower body. A central swirl cylinder is coaxially fixed to the upper side of the porous equalization plate and the air inlet pipe. A spiral guide vane is fixed on the central swirl cylinder. The upper ends of the spiral guide vane and the central swirl cylinder extend to the lower inner side of the air inlet pipe, and the outer ring of the spiral guide vane is fixedly connected to the inner wall of the air inlet pipe. A conical guide shroud is connected to the upper end of the central swirl cylinder. The upper end of the guide shroud is fixedly connected to the inner wall of the air inlet pipe. A telescopic cylinder is supported and fixed to the inner side of the guide shroud by circumferentially distributed diagonal braces. A plug capable of sealing the upper end of the central swirl cylinder is fixed to the telescopic spindle end of the telescopic cylinder.

[0011] Optionally, the gas collection and desorption assembly includes a hot air blower fixed to the outer wall of the adsorption tower body, the outlet of the hot air blower is connected to a desorption main pipe, the inner end of the desorption main pipe is connected to a desorption ring pipe sleeved on the motor, and a plurality of air blowing heads are distributed circumferentially on the lower side of the desorption ring pipe.

[0012] Optionally, the controllable exhaust assembly includes a connecting pipe, one end of which is connected to the gas collection chamber, and the other end of which is connected to the lower space of the porous flow equalization plate. A first solenoid valve and a second solenoid valve are respectively provided at both ends of the connecting pipe. An exhaust pipe is connected to the connecting pipe between the first solenoid valve and the second solenoid valve, and an auxiliary exhaust fan is installed on the exhaust pipe.

[0013] Optionally, a sliding groove is provided in the middle of the bottom of the carrier box, and a guide rail is slidably provided on the sliding groove. The inner end of the guide rail is fixedly connected to the central cylinder, and the outer end of the guide rail is fixedly connected to the inner wall of the adsorption tower body. A reset groove is provided on the upper side of the outer end of the guide rail, and a first elastic element is provided in the reset groove. One end of the first elastic element is fixedly connected to the carrier box, and the other end of the first elastic element is fixedly connected to the guide rail. A limiting groove is provided on the upper side of the guide rail. A limiting block extending into the limiting groove is fixed at the bottom of the inner end of the carrier box. An installation groove is provided on the guide rail on the lower side of the outer end of the limiting groove. A check block is slidably provided on the installation groove, and a second elastic element is provided in the installation groove. The second elastic element elastically supports the check block and causes the check block to partially extend into the limiting groove.

[0014] Optionally, when the carrier box is pulled outward, the limiting block slides outward along the limiting groove, and its end contacts the rounded chamfer of the check block and pushes the check block to overcome the elastic force of the second elastic element and retract into the mounting groove. After the limiting block slides past the check block, the check block pops out under the elastic force of the second elastic element, and its top surface forms a surface contact limiting block with the rear end surface of the limiting block, so that the carrier box is kept in the pulled-out maintenance position. When the carrier box is pushed inward, the limiting block squeezes the check block and retracts into the mounting groove. The carrier box retracts along the guide rail and elastically seals with the central cylinder under the pulling force of the first elastic element.

[0015] Optionally, a pretreatment box is installed at the air inlet at the top of the air inlet pipe. The inner side of the pretreatment box is provided with a primary filter cotton and an activated carbon pre-adsorption layer in sequence along the airflow direction. The pretreatment box is detachably connected to the air inlet pipe via a flange.

[0016] The molecular sieve VOCs adsorption treatment device provided by this invention has the following beneficial effects: The conical adsorption tower body, combined with a swirling flow equalization component extending into the inlet pipe, achieves uniform pretreatment of waste gas through swirling flow, improving the uniformity of airflow distribution. The adsorption tower body utilizes multiple circumferentially independently distributed molecular sieve adsorption components, forming a molecular sieve adsorption unit. Combined with the internal partitioning and guiding components, this achieves uniform, staggered connection between the inlet pipe and each half of the molecular sieve adsorption components, significantly improving the contact efficiency between waste gas and the adsorption material and the overall adsorption effect. Controllable high-temperature hot air is delivered to the bottom gas collection chamber via the gas collection and desorption component at the bottom of the adsorption tower body, achieving efficient desorption and regeneration of the molecular sieves, ensuring the recycling of adsorption materials and reducing operating costs. The controllable exhaust component on the adsorption tower body manages gas emissions from the top of the tower and the gas collection chamber, adapting to the airflow control requirements of the adsorption-desorption dual-process. Simultaneously, the sludge pipe and sealing cap at the bottom of the adsorption tower body facilitate the collection and cleaning of impurities within the device, preventing impurity accumulation from affecting airflow and adsorption efficiency.

[0017] In summary, the overall device has a reasonable structural design, high adsorption and desorption efficiency, and is convenient to operate and maintain, enabling continuous, stable, and efficient treatment of VOCs waste gas.

[0018] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0020] Figure 1This is a three-dimensional structural schematic diagram of the molecular sieve VOCs adsorption treatment device provided in an embodiment of the present invention; Figure 2 for Figure 1 Axonometric drawing; Figure 3 This is a partial structural diagram of the swirling flow equalization component in the molecular sieve VOCs adsorption treatment device provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of a single-layer molecular sieve adsorption unit (with reversing baffle) in the molecular sieve VOCs adsorption treatment device provided in the embodiment of the present invention. Figure 5 for Figure 4 A schematic diagram of the decomposed structure; Figure 6 for Figure 4 A schematic diagram of the structure viewed from below; Figure 7 This is a schematic diagram of the structure of a single molecular sieve adsorption component in the molecular sieve VOCs adsorption treatment device provided in an embodiment of the present invention; Figure 8 for Figure 7 Axonometric drawing; Figure 9 for Figure 8 A magnified structural diagram of part A in the middle.

[0021] In the diagram: 1-Adsorption tower body, 2-Carrier box inlet and outlet, 3-Push-pull handle, 4-Molecular sieve adsorption assembly, 5-Hot air blower, 6-Settling pipe, 7-Sealing cover, 8-First solenoid valve, 9-Connecting pipe, 10-Second solenoid valve, 11-Auxiliary exhaust fan, 12-Exhaust pipe, 13-Pretreatment box, 14-Inlet pipe, 15-Reversing baffle, 16-Swirl flow equalization assembly, 17-Primary filter cotton, 18-Activated carbon pre-adsorption layer, 19-Rotating shaft, 20-Carrier box, 21-Desorption main pipe 22-Desorption ring pipe, 23-Blowing head, 24-Motor, 25-Porous flow equalization plate, 26-Gas collection chamber, 27-Helical guide vane, 28-Central vortex cylinder, 29-Plug, 30-Diagonal brace, 31-Telescopic cylinder, 32-Central cylinder, 33-Divider plate, 34-Guide rail, 35-Mesh plate, 36-Slide groove, 37-Limiting groove, 38-Limiting block, 39-Reset groove, 40-First elastic element, 41-Check block, 42-Mounting groove, 43-Second elastic element, 44-Guide cover. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] The following is a detailed description of a molecular sieve VOCs adsorption treatment device according to an embodiment of the present invention, with reference to the accompanying drawings.

[0025] like Figures 1-2 As shown in Figures 4-6, a molecular sieve VOCs adsorption treatment device according to an embodiment of the present invention includes an adsorption tower body 1. The top and bottom of the adsorption tower body 1 are both conical structures. An inlet pipe 14 is connected to the top of the adsorption tower body 1. The bottom of the inner cavity of the adsorption tower body 1 is a gas collecting chamber 26. A sedimentation pipe 6 is connected to the bottom of the adsorption tower body 1, and a sealing cap 7 is detachably installed at the lower end of the sedimentation pipe 6. The bottom of the adsorption tower body 1 is conventionally supported by support legs. It also includes: Swirl flow equalization component 16: The inner top of the adsorption tower body 1 is equipped with a swirl flow equalization component 16 extending into the air inlet pipe 14. The swirl flow equalization component 16 is used to make the exhaust gas form a swirling flow and distribute it evenly. Molecular sieve adsorption unit: The adsorption tower body 1 is equipped with multiple layers of molecular sieve adsorption units, and each layer of molecular sieve adsorption unit includes multiple circumferentially independently distributed molecular sieve adsorption components 4. The separation and flow guiding component is installed inside the adsorption tower body 1. The separation and flow guiding component is used to separate the multiple molecular sieve adsorption components 4 in each layer. The separation and flow guiding component is also used to control the air inlet pipe 14 to be uniformly and alternately connected to half of the molecular sieve adsorption components 4 in each layer. The lower part of the adsorption tower body 1 is equipped with a gas collection and desorption component for conveying high-temperature hot air to the gas collection chamber 26, providing controllable high-temperature airflow conditions for molecular sieve desorption and regeneration. A controllable exhaust component is also installed on the adsorption tower body 1. The controllable exhaust component can control the exhaust of gas from the top of the adsorption tower body 1 and gas from the gas collection chamber 26, that is, the exhaust of gas that is being adsorbed and desorbed.

[0026] The molecular sieve VOCs adsorption treatment device of this invention uses a conical adsorption tower body 1 with a swirling flow equalization component 16 extending into the inlet pipe 14 to achieve uniform pretreatment of waste gas swirling flow and improve the uniformity of airflow distribution. Relying on the molecular sieve adsorption unit composed of multiple circumferentially independently distributed molecular sieve adsorption components 4 within the adsorption tower body 1, and in conjunction with the internal partitioning and guiding component, the inlet pipe 14 is uniformly and alternately connected to each half of the molecular sieve adsorption components 4, significantly improving the contact efficiency between waste gas and the adsorption material and the overall adsorption effect. Controllable high-temperature hot air is delivered to the bottom gas collection chamber 26 through the gas collection and desorption component at the bottom of the adsorption tower body 1, achieving efficient desorption and regeneration of the molecular sieve, ensuring the recycling of the adsorption material and reducing operating costs. The controllable exhaust component on the adsorption tower body 1 manages the gas emissions from the top of the tower and the gas collection chamber 26, adapting to the airflow control requirements of the adsorption-desorption dual process. Simultaneously, the sedimentation pipe 6 and sealing cap 7 at the bottom of the adsorption tower body 1 can conveniently collect and clean impurities within the device, preventing impurity accumulation from affecting airflow and adsorption effect.

[0027] In summary, the overall device has a reasonable structural design, high adsorption and desorption efficiency, and is convenient to operate and maintain, enabling continuous, stable, and efficient treatment of VOCs waste gas.

[0028] like Figures 1-2 As shown in Figures 3-9, in one embodiment, the middle part of the adsorption tower body 1 is a cylindrical structure. The separation and guiding assembly includes a central cylinder 32 coaxially disposed in the middle of the inner side of the adsorption tower body 1 and corresponding to each layer of molecular sieve adsorption unit. Multiple partition plates 33 for separating molecular sieve adsorption units 4 are fixedly distributed circumferentially on the outer side of the central cylinder 32. The outer end of the partition plate 33 is fixedly connected to the inner wall of the adsorption tower body 1. A rotating shaft 19 is coaxially disposed in the middle of the inner side of the adsorption tower body 1. The rotating shaft 19 is rotatably connected to the central cylinder 32. A motor 24 for driving the rotating shaft 19 to rotate is fixedly disposed at the lower end of the lowest central cylinder 32. A reversing baffle 15 is provided on the upper side of each layer of molecular sieve adsorption unit. The reversing baffle 15 can block the top of half of the molecular sieve adsorption unit 4 in the corresponding layer. The middle part of the reversing baffle 15 is also fixedly connected to the rotating shaft 19. The outer ring of the reversing baffle 15 is rotatably connected to the inner wall of the adsorption tower body 1.

[0029] The molecular sieve adsorption assembly 4 includes a fan-shaped carrier box 20 with an open top. A mesh plate 35 is fitted at the bottom of the carrier box 20. The mesh plate 35 is made of 304 stainless steel with a mesh size of 0.8-1mm, which ensures air permeability and prevents leakage of the molecular sieve adsorption packing. The carrier box 20 is filled with molecular sieve adsorption packing, and a push-pull handle 3 is fixed to the outer end of the carrier box 20. The side wall of the adsorption tower body 1 is provided with a carrier box inlet / outlet 2 for the carrier box 20 to enter and exit. When the inner end of the carrier box 20 abuts against the surface of the central cylinder 32, the side wall of the carrier box 20 is sealed against the partition plate 33, and at this time, the outer end of the carrier box 20 is sealed to the inlet / outlet wall of the carrier box 2, so that the whole is in a sealed state.

[0030] The branch of the reversing baffle 15 corresponding to the carrier box 20 can be arranged in a fan-shaped structure, without any limitation or elaboration.

[0031] Preferably, the top of the carrier box 20 is also provided with a metal filter screen (not shown), the mesh size of which is 80-120 mesh. The molecular sieve adsorption packing is a gradient pore size molecular sieve mixture, which is composed of large-pore molecular sieve particles and small-pore molecular sieve particles mixed at a volume ratio of 1:2-3. The pore size of the large-pore molecular sieve particles is 5-10 nm, and the pore size of the small-pore molecular sieve particles is 2-3 nm. The gradient particle size and gradient pore size are designed in synergy to ensure the permeability and flow of waste gas in the packing bed, and to achieve the graded adsorption of VOCs with different molecular diameters, which greatly improves the adsorption capacity and adsorption efficiency. In addition, the molecular sieve adsorption packing is pretreated by high temperature activation (vacuum activation at 200-250℃ for 2-3 h) before filling to remove moisture and impurities on the surface of the packing and increase the number of adsorption active sites of the molecular sieve.

[0032] In a preferred embodiment, the partition plate 33 is made of aluminum silicate fiber cotton composite stainless steel plate, which has both heat insulation and structural strength. The two sides of the partition plate 33 and the connection seam with the central cylinder 32 / adsorption tower body 1 are all embedded with high temperature resistant fluororubber sealing gaskets. The top surface of the partition plate 33 is also provided with an annular sealing groove, and a silicone sealing strip is embedded in the groove to achieve a sealing fit with the upper reversing baffle 15, thereby preventing the airflow from short-circuiting at the partition and ensuring that the airflow only flows through the molecular sieve adsorption component 4.

[0033] The reversing baffle 15 is a fan-shaped split structure adapted to the molecular sieve adsorption assembly 4. The number of its splits is consistent with the number of half of the molecular sieve adsorption assembly 4 in each layer. The reversing baffle 15 is made of polytetrafluoroethylene composite stainless steel plate, which has the characteristics of high temperature resistance, low friction and structural strength. The lower side of the reversing baffle 15 is fitted with a wear-resistant fluororubber sealing gasket, which seals against the top surface of the carrier box 20 below, thereby sealing the top of the corresponding half of the molecular sieve adsorption assembly 4. The outer ring of the reversing baffle 15 has an annular sealing groove, in which a rotating O-ring is embedded, which is rotatably sealed to the inner wall of the adsorption tower body 1, preventing airflow from leaking from the gap between the outer ring of the reversing baffle 15 and the tower body.

[0034] The carrier box 20 has several porous stainless steel support plates (not shown) spaced apart along the airflow direction inside. These plates support the molecular sieve adsorption packing, prevent the packing from collapsing between layers due to airflow impact, and ensure the air permeability and adsorption contact area of ​​the packing bed.

[0035] In one alternative embodiment, such as Figures 3-9 As shown, a groove 36 is provided in the middle of the bottom of the carrier box 20, and a guide rail 34 is slidably provided on the groove 36. The guide rail 34 adopts an I-shaped structure. The inner end of the guide rail 34 is fixedly connected to the central cylinder 32, and the outer end of the guide rail 34 is fixedly connected to the inner wall of the adsorption tower body 1.

[0036] A reset groove 39 is provided on the upper side of the outer end of the guide rail 34. A first elastic element 40 is provided in the reset groove 39 to make the inner end of the carrier box 20 elastically abut against the central cylinder 32. The first elastic element 40 can be a spring or an elastic rope. Specifically, one end of the first elastic element 40 is fixedly connected to the carrier box 20, and the other end of the first elastic element 40 is fixedly connected to the guide rail 34. The first elastic element 40 can make the carrier box 20 reset and elastically seal after being pulled out.

[0037] The upper side of the guide rail 34 is also provided with a limiting groove 37. The bottom inner end of the carrier box 20 is fixed with a limiting block 38 extending into the limiting groove 37. The lower outer end of the limiting groove 37 is provided with an installation groove 42 on the guide rail 34. An inverted T-shaped check block 41 is slidably provided on the installation groove 42. A second elastic element 43 is provided in the installation groove 42 to elastically support the check block 41 and allow the check block 41 to extend into the limiting groove 37. The second elastic element 43 can be a spring.

[0038] When the carrier box 20 is pulled outward, the carrier box 20 causes the limiting block 38 to slide outward along the limiting groove 37. The end of the limiting block 38 contacts the rounded chamfer of the check block 41 and generates a squeezing force, pushing the check block 41 to overcome the elastic force of the second elastic element 43 and retract into the mounting groove 42. Then, the limiting block 38 slides over the check block 41, and the check block 41 quickly pops out to the initial position under the elastic force of the second elastic element 43. At this time, the top surface of the check block 41 and the rear surface of the limiting block 38 form a surface contact limiting block, which can effectively overcome the pulling force of the first elastic element 40 and keep the carrier box 20 in place. The carrier box 20 is pulled out to the maintenance position without resetting itself. When the staff performs maintenance operations such as replacing or cleaning the molecular sieve packing, there is no need to manually fix the carrier box 20, avoiding operational safety hazards and equipment damage caused by accidental resetting of the carrier box 20. After maintenance is completed, the staff only needs to apply a certain pushing force to the inside, so that the limiting block 38 overcomes the elastic force of the second elastic element 43 and squeezes the check block 41 to retract again, which can drive the carrier box 20 to retract inward along the guide rail 34. With the assistance of the pulling force of the first elastic element 40, the carrier box 20 can quickly and accurately reset and achieve elastic sealing with the central cylinder 32.

[0039] Meanwhile, the engagement between the outer end of the limiting groove 37 and the limiting block 38 limits the length of the carrier box 20 that can be pulled out, preventing the first elastic element 40 from failing due to overload or the carrier box 20 from separating from the adsorption tower body 1 due to excessive pulling out. This limiting design further improves the reliability of the carrier box 20's pulling operation and extends the equipment's service life. In addition, the I-shaped guide rail 34 and the sliding groove 36 at the bottom of the carrier box 20 form a multi-faceted sliding fit. Combined with the guiding and limiting functions of the limiting groove 37 and the limiting block 38, this ensures the straightness of the carrier box 20 throughout the entire pulling and pushing process, avoiding jamming or offset issues and ensuring the stability and reliability of the pulling operation.

[0040] like Figures 1-3 As shown, in one embodiment, the swirl flow equalization assembly 16 includes a porous flow equalization plate 25 fixed to the top of the adsorption tower body 1. A central swirl cylinder 28 is fixed to the upper side of the porous flow equalization plate 25 coaxially with the air inlet pipe 14. A spiral guide vane 27 is fixed on the central swirl cylinder 28. The upper ends of the spiral guide vane 27 and the central swirl cylinder 28 extend to the lower inner side of the air inlet pipe 14, and the outer ring of the spiral guide vane 27 is fixedly connected to the inner wall of the air inlet pipe 14. A conical guide shroud 44 is connected to the upper end of the central swirl cylinder 28. The upper end of the guide shroud 44 is fixedly connected to the inner wall of the air inlet pipe 14. A telescopic cylinder 31 is supported and fixed on the inner side of the guide shroud 44 by circumferentially distributed diagonal braces 30. The telescopic cylinder 31 is preferably a high-temperature resistant electric telescopic cylinder. A plug 29 that can seal the upper end of the central swirl cylinder 28 is fixed to the end of the telescopic spindle of the telescopic cylinder 31.

[0041] Preferably, a hollow stainless steel central vortex cylinder 28 is coaxially fixed to the upper side of the porous flow equalization plate 25 and the air inlet pipe 14. The outer diameter of the central vortex cylinder 28 is 1 / 3 to 1 / 2 of the inner diameter of the air inlet pipe 14. The central vortex cylinder 28 has several vortex flow holes evenly opened around its circumference. The diameter of the vortex flow holes is 8-12 mm, the hole spacing is 20-25 mm, and the vortex flow holes are arranged in 2-3 rows along the axial direction of the central vortex cylinder 28 in an alternating manner, so that the airflow inside and outside the central vortex cylinder 28 can form a coordinated vortex, further improving the flow equalization effect. The spiral guide blade 27 is made of wear-resistant stainless steel plate bent into shape, with a spiral angle of 30°-45°, a pitch of 1.2-1.5 times the outer diameter of the central vortex cylinder 28, and a blade thickness of 3-5 mm. The outer ring of the spiral guide blade 27 is fixedly connected to the inner wall of the air inlet pipe 14 by welding. The porous flow equalization plate 25 is made of 304 stainless steel with a thickness of 5-8mm, combining structural strength and air permeability. The surface of the porous flow equalization plate 25 is provided with an array of flow equalization micropores with a diameter of 3-8mm (preferably 5mm). The flow equalization micropores are arranged in an equilateral triangular array on the porous flow equalization plate 25 with a spacing of 10-15mm and an array density of 60-80 micropores / ㎡, ensuring that the airflow forms a uniform surface airflow after passing through the micropores and avoiding local flow velocity differences.

[0042] The gas collection and desorption assembly includes a hot air blower 5 fixed to the outer wall of the adsorption tower body 1. The outlet of the hot air blower 5 is connected to a desorption main pipe 21. The inner end of the desorption main pipe 21 is connected to a desorption ring pipe 22 sleeved on the motor 24. Multiple air blowing heads 23 are distributed circumferentially on the lower side of the desorption ring pipe 22.

[0043] Preferably, the desorption main pipe 21 is equipped with a flow control valve and a temperature sensor (not shown).

[0044] The controllable exhaust assembly includes a connecting pipe 9, one end of which is connected to the gas collection chamber 26, and the other end of which is connected to the porous flow equalization plate 25. The connecting pipe 9 is also connected to the lower space of the porous flow equalization plate 25. A first solenoid valve 8 and a second solenoid valve 10 are respectively provided at both ends of the connecting pipe 9. An exhaust pipe 12 is also connected to the connecting pipe 9 between the first solenoid valve 8 and the second solenoid valve 10. An auxiliary exhaust fan 11 is installed on the exhaust pipe 12.

[0045] In one optional embodiment, the inner wall of the adsorption tower body 1 is provided with a heat insulation layer, which is an aluminum silicate fiber cotton layer with a thickness of 5-15cm.

[0046] A pretreatment box 13 is also installed at the air inlet at the top of the air inlet pipe 14. The inner side of the pretreatment box 13 is provided with a primary filter cotton 17 and an activated carbon pre-adsorption layer 18 in sequence along the airflow direction. The pretreatment box 13 and the air inlet pipe 14 are detachably connected by a flange.

[0047] It also includes an online monitoring component and a controller. The online monitoring component includes a VOCs concentration sensor and a differential pressure sensor. The VOCs concentration sensor is respectively located at the air inlet and air outlet of the adsorption tower body 1. The differential pressure sensor is located between two adjacent molecular sieve adsorption units. The VOCs concentration sensor, differential pressure sensor, temperature sensor, flow control valve and hot air blower 5 are all electrically connected to the controller.

[0048] Furthermore, no specific limitations are made on the control, model, and circuit connection of each component; these can be flexibly configured in practical applications. All circuits, electronic components, and modules involved are existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The scope of protection of this invention does not involve improvements to the software and methods.

[0049] The present invention provides a molecular sieve VOCs adsorption treatment device in the above embodiments, comprising an adsorption stage and a desorption stage, specifically: 1) For the adsorption stage (core treatment process): The VOCs waste gas to be treated enters the device from the inlet pipe 14 at the top of the adsorption tower body 1. It first flows through the pretreatment box 13 at the inlet, and then passes through the primary filter cotton 17 (to remove dust particles) and the activated carbon pre-adsorption layer 18 (to remove large molecular impurities) in sequence, and then enters the swirl flow equalization component 16.

[0050] Within the swirling flow equalization assembly 16, the airflow is guided by the swirling flow holes of the central swirling cylinder 28 and the spiral guide vanes 27 to form a swirling flow. Then, it passes through the array of micropores in the porous flow equalization plate 25 to achieve uniform air distribution. After that, it passes through the multi-layer molecular sieve adsorption unit from top to bottom, where VOCs molecules are adsorbed and retained by the molecular sieve packing.

[0051] At this time, the second solenoid valve 10 is closed and the first solenoid valve 8 is open. The plug 29 seals the upper end of the central vortex cylinder 28. The purified gas is discharged through the connecting pipe 9 and then through the outlet pipe 12, and finally meets the emission standards and is discharged to the outside for further treatment.

[0052] 2) Desorption stage (molecular sieve regeneration process): After the hot air blower 5 is started, the high temperature hot air enters the gas collection chamber 26 at the bottom of the adsorption tower body 1 through the desorption main pipe 21. The conical structure of the gas collection chamber 26 guides the hot air to diffuse evenly upwards and pass through the multi-layer molecular sieve adsorption unit, so that the adsorbed saturated VOCs molecules are desorbed and desorbed.

[0053] At this time, the second solenoid valve 10 is open and the first solenoid valve 8 is closed. The plug 29 seals the upper end of the central vortex cylinder 28. The exhaust gas carrying desorbed VOCs is discharged through the connecting pipe 9 and then through the outlet pipe 12. This exhaust gas needs to be connected to the subsequent supporting treatment device (such as a condensation recovery tower or catalytic combustion device, not shown) to realize the recovery or harmless treatment of VOCs. It cannot be directly discharged.

[0054] In addition, during the above process, the motor 24 can intermittently drive the reversing baffle 15 to rotate, which not only allows the gas to flow in an alternating manner, but also ensures that only half of the carrier box 20 in each layer is active, making maintenance and replacement easier.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A molecular sieve VOCs adsorption treatment device, comprising an adsorption tower body (1), wherein an air inlet pipe (14) is connected to the top of the adsorption tower body (1). The bottom of the inner cavity of the adsorption tower body (1) is a gas collection chamber (26). The bottom end of the adsorption tower body (1) is connected to a sludge pipe (6), and a sealing cap (7) is detachably installed at the lower end of the sludge pipe (6). The characteristic of this structure is that... Also includes: Swirl flow equalization component (16): The inner top of the adsorption tower body (1) is equipped with a swirl flow equalization component (16) extending into the air inlet pipe (14). The swirl flow equalization component (16) is used to make the exhaust gas form a swirling flow and distribute it evenly. Molecular sieve adsorption unit, the adsorption tower body (1) is equipped with multiple layers of molecular sieve adsorption units, each layer of molecular sieve adsorption unit includes multiple circumferentially independently distributed molecular sieve adsorption components (4). The separation and flow guiding component is installed inside the adsorption tower body (1). The separation and flow guiding component is used to separate the multiple molecular sieve adsorption components (4) in each layer, and to control the air inlet pipe (14) to be uniformly and alternately connected to half of the molecular sieve adsorption components (4) in each layer. Gas collection and desorption assembly: The lower part of the adsorption tower body (1) is equipped with a gas collection and desorption assembly, which is used to deliver high-temperature hot air to the gas collection chamber (26). Controllable exhaust assembly: The adsorption tower body (1) is equipped with a controllable exhaust assembly, which is used to control the exhaust of gas from the top of the adsorption tower body (1) and gas from the gas collection chamber (26).

2. The molecular sieve VOCs adsorption treatment device according to claim 1, characterized in that, The separation and flow guiding assembly includes a central cylinder (32) coaxially disposed in the middle of the inner side of the adsorption tower body (1) and corresponding to each layer of molecular sieve adsorption unit. A plurality of partition plates (33) are fixed on the outer circumferential side of the central cylinder (32), and the outer ends of the partition plates (33) are fixedly connected to the inner wall of the adsorption tower body (1). The adsorption tower body (1) has a rotating shaft (19) coaxially arranged in the middle of its inner side. The rotating shaft (19) and the central cylinder (32) are rotatably connected. The lower end of the central cylinder (32) at the bottom is fixed with a motor (24) for driving the rotating shaft (19) to rotate. Each layer of the molecular sieve adsorption unit is provided with a reversing baffle (15) on its upper side. The middle part of the reversing baffle (15) is fixedly connected to the rotating shaft (19), and the outer ring of the reversing baffle (15) is rotatably connected to the inner wall of the adsorption tower body (1).

3. The molecular sieve VOCs adsorption treatment device according to claim 2, characterized in that, The molecular sieve adsorption assembly (4) includes a fan-shaped carrier box (20) with an open top. The bottom of the carrier box (20) is provided with a mesh plate (35). The carrier box (20) is filled with molecular sieve adsorption filler. The outer end of the carrier box (20) is fixed with a push-pull handle (3). The adsorption tower body (1) has a carrier box inlet and outlet (2) on its side wall for the carrier box (20) to enter and exit. When the inner end of the carrier box (20) abuts against the surface of the central cylinder (32), the side wall of the carrier box (20) is sealed against the partition plate (33), and the outer end of the carrier box (20) is sealed against the inlet wall of the carrier box inlet (2).

4. The molecular sieve VOCs adsorption treatment device according to claim 3, characterized in that, The molecular sieve adsorption packing is a gradient pore size molecular sieve mixture, which is composed of large-pore molecular sieve particles and small-pore molecular sieve particles mixed in a volume ratio of 1:2-3. The pore size of the large-pore molecular sieve particles is 5-10 nm, and the pore size of the small-pore molecular sieve particles is 2-3 nm. The molecular sieve adsorption packing is pretreated by high-temperature activation at 200-250℃ for 2-3 hours before filling.

5. The molecular sieve VOCs adsorption treatment device according to any one of claims 1-4, characterized in that, The swirling flow equalization assembly (16) includes a porous flow equalization plate (25) fixed to the top of the adsorption tower body (1). A central swirling cylinder (28) is fixed coaxially to the air inlet pipe (14) on the upper side of the porous flow equalization plate (25). A spiral guide vane (27) is fixed on the central swirling cylinder (28). The upper ends of the spiral guide vane (27) and the central swirling cylinder (28) extend to the lower inner side of the air inlet pipe (14), and the outer ring of the spiral guide vane (27) is fixedly connected to the inner wall of the air inlet pipe (14). The upper end of the central vortex tube (28) is connected to a cone-shaped guide shroud (44). The upper end of the guide shroud (44) is fixedly connected to the inner wall of the air inlet pipe (14). The inner side of the guide shroud (44) is supported and fixed by circumferentially distributed diagonal braces (30) to a telescopic cylinder (31). The telescopic spindle end of the telescopic cylinder (31) is fixed with a plug (29) that can seal the upper end of the central vortex tube (28).

6. The molecular sieve VOCs adsorption treatment device according to any one of claims 2-4, characterized in that, The gas collection and desorption assembly includes a hot air blower (5) fixed to the outer wall of the adsorption tower body (1). The outlet of the hot air blower (5) is connected to a desorption main pipe (21). The inner end of the desorption main pipe (21) is connected to a desorption ring pipe (22) sleeved on the motor (24). Multiple air blowing heads (23) are distributed circumferentially on the lower side of the desorption ring pipe (22).

7. The molecular sieve VOCs adsorption treatment device according to claim 5, characterized in that, The controllable exhaust assembly includes a connecting pipe (9), one end of which is connected to the gas collection chamber (26), and the other end of which is connected to the lower space of the porous flow equalization plate (25). The two ends of the connecting pipe (9) are respectively provided with a first solenoid valve (8) and a second solenoid valve (10). An air outlet pipe (12) is connected to the connecting pipe (9) between the first solenoid valve (8) and the second solenoid valve (10). An auxiliary air outlet fan (11) is installed on the air outlet pipe (12).

8. The molecular sieve VOCs adsorption treatment device according to claim 3 or 4, characterized in that, The carrier box (20) has a groove (36) in the middle of its bottom. A guide rail (34) is slidably provided on the groove (36). The inner end of the guide rail (34) is fixedly connected to the central cylinder (32), and the outer end of the guide rail (34) is fixedly connected to the inner wall of the adsorption tower body (1). A reset groove (39) is provided on the upper side of the outer end of the guide rail (34). A first elastic element (40) is provided in the reset groove (39). One end of the first elastic element (40) is fixedly connected to the carrier box (20), and the other end of the first elastic element (40) is fixedly connected to the guide rail (34). A limiting groove (37) is provided on the upper side of the guide rail (34). A limiting block (38) extending into the limiting groove (37) is fixed at the bottom of the inner end of the carrier box (20). An installation groove (42) is provided on the guide rail (34) at the lower side of the outer end of the limiting groove (37). A check block (41) is slidably provided on the installation groove (42). A second elastic element (43) is provided in the installation groove (42). The second elastic element (43) elastically supports the check block (41) and causes the check block (41) to partially extend into the limiting groove (37).

9. The molecular sieve VOCs adsorption treatment device according to claim 8, characterized in that, When the carrier box (20) is pulled outward, the limiting block (38) slides outward along the limiting groove (37), and its end contacts the rounded chamfer of the check block (41) and pushes the check block (41) to overcome the elastic force of the second elastic element (43) and retract into the mounting groove (42). After the limiting block (38) slides past the check block (41), the check block (41) pops out under the elastic force of the second elastic element (43), and its top surface forms a surface contact limiting block with the rear end surface of the limiting block (38), so that the carrier box (20) is kept in the pulled-out maintenance position. When the carrier box (20) is pushed inward, the limiting block (38) squeezes the check block (41) into the mounting groove (42), and the carrier box (20) retracts along the guide rail (34) and is elastically sealed with the central cylinder (32) under the pulling force of the first elastic element (40).

10. The molecular sieve VOCs adsorption treatment device according to any one of claims 1-4, characterized in that, A pretreatment box (13) is installed at the top air inlet of the air inlet pipe (14). The pretreatment box (13) is provided with a primary filter cotton (17) and an activated carbon pre-adsorption layer (18) in sequence along the airflow direction. The pretreatment box (13) and the air inlet pipe (14) are detachably connected by a flange.

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