Integrated volatile organic compound waste gas treatment device

Abstract

The utility model provides a volatile organic compound waste gas integrated type processing equipment, including the square section tower body, its inside is divided into at least two stage absorption units along the length direction, is communicated in series through the built -in air duct between adjacent absorption units, is equipped with the waste gas import with the waste gas import opposite side wall upper portion is equipped with the waste gas export every absorption unit's side wall lower part, the bottom end of air duct communicates the waste gas import of downstream absorption unit, its top end communicates the waste gas export of upstream absorption unit, the lower end of every absorption unit is horizontally provided with the air distribution plate, is set up a plurality of regular arrangement's air hole on the air distribution plate, and the air hole porosity of air distribution plate increases along the waste gas import to the opposite side direction gradient. The utility model designs the square section structure to the traditional cylindrical tower body, through the height intensive design of function unit, not only can significantly reduce equipment overall floor space, but also can realize integral factory prefabrication and standardization production, effectively avoids the installation error on site.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, specifically to an integrated treatment equipment for volatile organic compound waste gas. Background Technology

[0002] Volatile organic compounds (VOCs) are typical pollutants in industrial waste gas, mainly originating from industries such as petrochemicals, spray printing, and pharmaceutical synthesis. These substances are characterized by high volatility, complex composition, and the presence of some carcinogens (such as benzene compounds and halogenated hydrocarbons). Their hazards are mainly manifested in two aspects: firstly, environmental hazards, as VOCs react with nitrogen oxides under sunlight to generate ozone and PM2.5, which are key precursors to smog formation; secondly, health hazards, as long-term exposure can lead to damage to the human nervous system, and some components (such as formaldehyde) are classified as Group 1 carcinogens by the WHO.

[0003] Among current mainstream treatment technologies, absorption towers are widely used due to their simple operation and controllable cost. The typical structure of existing absorption towers is mainly a cylindrical tower body, with packing layers and swirl plates inside. Waste gas enters from the bottom and exits from the top of the tower, while the absorbent liquid is sprayed counter-currently, creating a counter-current mass transfer effect. Although the treatment and purification technology for volatile organic compound (VOC) waste gas is mature, existing equipment still has the following problems:

[0004] 1. Transportation Restrictions: To accommodate large air volumes, cylindrical towers require enlarged cross-sectional diameters. The cross-sectional dimensions must be calculated based on the specified cross-sectional wind speed requirements, especially for packed towers (where the cross-sectional wind speed is generally taken as 1.2-1.5 m / s). When handling large air volumes, the cross-sectional dimensions corresponding to the wind speed will be too large, resulting in equipment that is too wide (greater than 4.5 m) or too high (greater than 4 m), exceeding the limits for road transportation and forcing it to be transported in sections. Large-diameter towers need to be transported in sections, and on-site welding increases the risk of leakage, such as flange seal failure.

[0005] 2. Generally, single-stage absorption prioritizes efficiency, requiring 2-3 towers to be connected in series to meet emission standards. This leads to complex on-site pipelines, such as intersecting air ducts and water pipes, increasing on-site installation work and construction costs. Furthermore, when multiple towers are connected in series longitudinally, differences in foundation settlement of each tower can easily cause deformation and leakage in the connecting pipelines. Utility Model Content

[0006] This invention addresses the problems of transportation limitations and high construction costs caused by size issues in existing volatile organic compound (VOC) waste gas treatment and purification equipment during practical application, and proposes an integrated VOC waste gas treatment device.

[0007] To achieve the above objectives, the present invention proposes the following technical solution:

[0008] An integrated treatment device for volatile organic compound waste gas includes a tower body with a square cross-section, the interior of which is divided into at least two absorption units along the length direction, and adjacent absorption units are connected in series through built-in air ducts.

[0009] Each absorption unit is provided with an exhaust gas inlet on the lower part of its side wall and an exhaust gas outlet on the upper part of its side wall opposite to the exhaust gas inlet.

[0010] The bottom end of the air duct is connected to the exhaust gas inlet of the downstream absorption unit, and the top end is connected to the exhaust gas outlet of the upstream absorption unit.

[0011] Each absorption unit has a horizontally arranged air distribution plate at its lower end. The air distribution plate has several regularly arranged air holes, and the porosity of the air distribution plate increases gradually from the exhaust gas inlet to the opposite side.

[0012] As a preferred embodiment of this utility model, the shape of the pore is circular, triangular, square, or regular polygonal.

[0013] As a preferred technical solution of this utility model, each absorption unit is provided with a liquid collection tank, a packing layer and a spray pipe from bottom to top;

[0014] The highest liquid level in the collection tank shall not be higher than the lowest point of the exhaust gas inlet;

[0015] The bottommost surface of the packing layer is not lower than the highest point of the exhaust gas inlet;

[0016] The spray pipe is equipped with several evenly arranged nozzles.

[0017] As a preferred embodiment of this utility model, the filler layer is provided in at least two layers, and each filler layer can be detachably connected to the inner wall of the absorption unit.

[0018] In a preferred embodiment of this invention, the spray pipe is connected to a circulating water pump via a delivery pipe, and the circulating water pump is connected to the liquid collection tank via a circulation pipe.

[0019] As a preferred embodiment of the present invention, a filter assembly is detachably connected to one end of the circulation pipe near the liquid collection tank.

[0020] The filter assembly includes an outer filter frame and an inner filter frame connected by clamps.

[0021] As a preferred technical solution of this utility model, the tower body has an installation cavity independent of the absorption unit on a first side along its length direction, the conveying pipe and the circulating water pump are both installed in the installation cavity, and the outer wall of the installation cavity is provided with an inspection hole.

[0022] As a preferred technical solution of this utility model, the side wall of the liquid collection tank is provided with a water inlet, an overflow outlet and a drain outlet from top to bottom.

[0023] As a preferred embodiment of this utility model, the tower body has several replacement holes on its second side along its length.

[0024] As a preferred technical solution of this utility model, the bottom of the tower body is provided with an integral frame base, which includes a grid-shaped steel structure frame and a steel base plate, and the steel base plate is fixedly connected to the bottom of the steel structure frame.

[0025] As can be seen from the above technical solutions, the present invention provides an integrated treatment device for volatile organic compound waste gas, which has the following advantages compared with the prior art:

[0026] (1) Convenience of transportation and optimization of space utilization: The traditional cylindrical cross-section is designed as a square cross-section. By linearly relating the length dimension to the design air volume, the cross-sectional wind speed requirements are met while avoiding the problem of exceeding transportation limits. The internal air duct replaces the external pipe, making the overall layout of the equipment compact and significantly reducing the floor space.

[0027] (2) Reduced installation efficiency and construction costs: The integrated skid-mounted structure pre-assembles the multi-stage absorption unit, air duct, circulating water pump and spray system into one unit, reducing the workload of on-site pipe connection, equipment installation and commissioning; this design simplifies the construction process and saves management costs; in addition, the integrated structure facilitates standardized production in the factory and reduces processing complexity.

[0028] (3) An integral frame is set at the bottom of the equipment to enhance the anti-settlement capacity, avoid deformation or leakage of connecting pipes due to uneven foundation, significantly reduce the requirements of the existing foundation, and reduce the foundation construction intensity and cost.

[0029] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0030] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0031] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a front view of the integrated volatile organic compound waste gas treatment equipment of this utility model;

[0033] Figure 2 This is a side view of the structure of the integrated volatile organic compound waste gas treatment equipment of this utility model;

[0034] Figure 3 This is a schematic diagram of the layout of a conventional volatile organic compound waste gas treatment equipment in Example 1;

[0035] Figure 4 This is a front view of the layout of the integrated volatile organic compound waste gas treatment equipment of Example 1;

[0036] Figure 5 This is a side view of the layout of the integrated volatile organic compound waste gas treatment equipment of Example 1.

[0037] 1. Tower body; 101. Exhaust gas inlet; 102. Exhaust gas outlet; 103. Liquid collection tank; 104. Installation cavity; 105. Inspection hole; 106. Replacement hole; 2. Air duct; 3. Packing layer; 4. Air distribution plate; 401. Air hole; 5. Spray pipe; 501. Nozzle; 6. Delivery pipe; 7. Circulating water pump; 8. Circulation pipe; 9. Overflow port; 10. Water inlet; 11. Drainage port; 12. Connecting pipe; 13. Integral frame base. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0039] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] This invention addresses the problems of conventional multi-stage absorption equipment for volatile organic compounds (VOCs) waste gas, such as system dispersion, large footprint, complex transportation and installation, and high on-site construction costs. It proposes an integrated VOCs waste gas treatment device that optimizes the system by redesigning the traditional cylindrical tower into a square cross-section structure. Through highly integrated functional unit design, it significantly reduces the overall footprint of the equipment and enables prefabrication and standardized production in the factory, effectively avoiding on-site installation errors. Furthermore, the integrated design allows for overall hoisting and transportation, greatly reducing the difficulty of logistics and disassembly. Combined with a pre-commissioned factory delivery mode, it saves on-site construction management costs and shortens the construction period.

[0041] This equipment includes a tower body 1 with a square cross-section and at least two stages of absorption units, wherein the absorption units are connected in series along the length of the tower body 1.

[0042] The tower body 1 has a width of 1.5m≤W≤4m and a height of 2.5m≤H≤3m. Its length dimension (L) is linearly related to the design air volume.

[0043] like Figure 1As shown, multiple identical absorption units are arranged in series along the length of the tower body 1. Each absorption unit has a waste gas inlet 101 on the lower part of its side wall and a waste gas outlet 102 on the upper part of its side wall opposite to the waste gas inlet 101, which facilitates the flow of waste gas from bottom to top through each absorption unit under the suction of a fan or similar device. Adjacent absorption units are connected by built-in air ducts 2, which serve not only as gas flow channels but also as the boundary between adjacent absorption units. Specifically, the air ducts 2 are longitudinally arranged between adjacent absorption units, with their bottom end connected to the waste gas inlet 101 of the downstream absorption unit and their top end connected to the waste gas outlet 102 of the upstream absorption unit. This ensures that the waste gas flows from bottom to top when entering each absorption unit and then contacts the absorbent sprayed from the top of the absorption unit in a counter-current manner for mass transfer.

[0044] Because the exhaust gas inlet 101 of each absorption unit is located at the lower part of its side wall, and the tower body 1 has a square cross-section structure, when the exhaust gas enters the absorption unit through the exhaust gas inlet 101, most of the exhaust gas rises in the inlet side area due to inertia, while a small portion of the exhaust gas diffuses along the exhaust gas inlet 101 to the opposite side before rising. This results in uneven distribution of exhaust gas within the same absorption unit upon initial entry. In particular, when a packing layer 3 is installed in the middle of the absorption unit, the local absorption load of the packing layer 3 near the exhaust gas inlet is much greater than that of the side farther from the exhaust gas inlet, leading to significant differences in the absorption load of the same packing layer 3. Therefore, to ensure uniform distribution of exhaust gas after entering the absorption unit and uniform rise at the lower end of the same absorption unit, this invention provides a gas distribution plate 4 at the lower end of each absorption unit, with the gas distribution plate 4 parallel to the bottom surface of the tower body 1. The air distribution plate 4 is located behind the exhaust gas inlet 101 and has several regularly arranged air holes 401 on it. The porosity of the air holes 401 increases gradually from the exhaust gas inlet 101 to the opposite side. That is, the porosity is small on the side closer to the exhaust gas inlet 101, forming a high-resistance zone and inhibiting the immediate rise of exhaust gas; the porosity is large on the side farther from the exhaust gas inlet 101, forming a low-resistance zone and inducing horizontal diffusion of exhaust gas. By physically blocking and forcibly changing the airflow path, the exhaust gas is transformed from disordered upward movement to a combined horizontal diffusion and vertical upward movement, thereby making the exhaust gas as evenly distributed as possible on the surface of the packing layer. In some specific embodiments of this utility model, the porosity gradient of the air holes 401 of the air distribution plate 4 satisfies the following: the porosity at the closest end to the exhaust gas inlet 101 is 30%, and the porosity at the farthest end is 60%, with the porosity gradually increasing linearly from the closest end to the farthest end of the exhaust gas inlet 101.

[0045] In some specific embodiments of this utility model, the shape of the air hole 401 can be any one of the following: circle, triangle, square, regular polygon, etc., and the arrangement of the air hole 401 can be array arrangement, equilateral triangle arrangement, rhombus arrangement, etc.

[0046] In order to enhance the purification and absorption effect of the absorption unit on the waste gas, each absorption unit is provided with a liquid collection tank 103, a packing layer 3 and a spray pipe 5 from bottom to top.

[0047] The packing layer 3 has at least two layers and is detachably connected to the inner wall of the tower body 1 via a transverse sliding rail structure. The sliding rail structure includes U-shaped channel steel symmetrically welded or bolted to the inner walls of both sides of the tower body 1 in the width direction. A connecting frame is provided on the outer periphery of the packing layer 3, and the connecting frame has protruding strips on both sides that are clearance-fitted with the inner cavity of the channel steel.

[0048] In some specific embodiments of this utility model, the packing layer 3 can adopt existing technology. The packing layer 3 is used to generate turbulence when the exhaust gas passes through the pores of the packing, thereby disrupting the gas-liquid boundary layer; at the same time, it can intercept large particulate pollutants and absorb part of the gas.

[0049] The exhaust gas inlet 101 is located between the bottom packing layer 3 and the highest liquid level of the collection tank 103. This is to prevent the highest point of the exhaust gas inlet 101 from being higher than the lower limit of the bottom packing layer, and to prevent the lowest point of the exhaust gas inlet 101 from being lower than the upper limit of the highest liquid level of the collection tank 103, which would cause the absorbent liquid to flow back to the exhaust gas inlet 101.

[0050] The air distribution plate 4 is located below the bottom packing layer 3 and above the top of the exhaust gas inlet 101.

[0051] To maximize the absorption and purification of waste gas, the spray pipe 5 is positioned 100-200mm above the top layer of packing 3. Several evenly arranged nozzles 501 are mounted on the spray pipe 5, with a center-to-center distance of 150±10mm between adjacent nozzles. The axis of each nozzle 501 forms a 10°-20° angle with the normal to the packing layer 3. The spray pipe 5 is connected to a circulating water pump 7 via a delivery pipe 6. The circulating water pump 7 is connected to the outlet connector at the bottom of the collection tank 103 via a circulation pipe 8. A filter assembly is detachably connected to one end of the circulation pipe 8 near the collection tank 103 for filtering impurities in the absorbent liquid. The filter assembly includes an outer filter screen frame and an inner filter screen frame connected by clamps. The outer filter screen frame has a pore size of 2-3mm to intercept fibers and large particles; the inner filter screen frame has a pore size of 0.5-1.0mm to collect crystalline precipitates. The filter screen frames are connected by flange clamps, allowing for rapid replacement.

[0052] like Figure 2As shown, the top surface of the collection tank 103 is 10-20cm lower than the lowest point of the exhaust gas inlet. An overflow port 9 is provided on its side wall, with the centerline of the overflow port 9 coinciding with the designed highest liquid level of the collection tank 103. A water inlet 10, located 10-20cm above the overflow port 9, is used to replenish water to the collection tank 103. A drain port 11, located 10-15cm below the overflow port 9, is used to drain water. The collection tank 103 is also equipped with a level gauge for monitoring the liquid level. The collection tanks 103 of adjacent absorption units are connected by a connecting pipe 12.

[0053] The first side of the tower body 1 along its length has an independent mounting cavity 104, separate from the absorption unit. Several inspection holes 105 are provided on the outer wall of the mounting cavity 104. The circulating water pump 7 is located at the bottom of the mounting cavity 104, and can be inspected or maintained through the inspection holes 105. The width of the mounting cavity 104 can be designed based on the dimensions of the circulating water pump 7, the reserved dimensions of the pipe flange, and the preset dimensions of the maintenance passage. However, to avoid weakening the overall structural strength of the equipment, the width of the mounting cavity 104 should not exceed 1 / 3 of the total width of the tower body. Through the optimized layout of the mounting cavity 104, vulnerable components such as the circulating water pump 7 and filter components are concentrated in an independent mounting cavity 104, and maintenance is performed through the inspection holes 105 without needing to stop the machine and enter the absorption unit.

[0054] Several replacement holes 106 are provided on the second side along the length of the tower body 1, through which the packing in the packing layer 3 is replaced. Each packing layer 3 is independently equipped with a replacement hole 106, and the lower edge of the replacement hole 106 is 50mm away from the upper plane of the slide rail of the packing layer 3 to avoid interference with the pulling.

[0055] Both the inspection hole 105 and the replacement hole 106 are equipped with corresponding sealing doors, which can be closed by existing hinged sealing doors and only opened when the equipment needs to be repaired or the packing needs to be replaced.

[0056] The bottom of this equipment is also provided with an integral frame base 13. The integral frame 13 includes a grid-shaped steel structure frame and a steel base plate. The longitudinal beams of the frame are parallel to the length direction of the tower body, the horizontal beam spacing is 800-1200mm, and the steel base plate with a thickness of ≥10mm is embedded in the bottom of the frame and fixed by welding or other connection methods.

[0057] Example 1

[0058] At 50000m 3 Taking a conventional three-stage absorption process with a design air volume of / h as an example, to meet the requirement of a cross-sectional wind velocity of 1.5m / s, such as Figure 3 As shown, the standard cross-sectional dimension of a single absorption tower is 3500mm in diameter, and the overall layout dimensions are approximately 14.5m × 5.5m ≈ 80m. 2During transportation, it needs to be divided into 3 sections, with the maximum size of a single piece being 3.5×5m.

[0059] After changing to the integrated structure described in this utility model, in order to meet the requirement of a cross-sectional wind speed of 1.5 m / s, such as Figure 4 , Figure 5 As shown, the cross-sectional area of ​​a single absorption unit is 3m × 3m = 9m². 2 The overall footprint of the equipment is 10.2m × 3.6m ≈ 37m². 2 Compared to traditional equipment, space utilization is increased by 53%. It can be transported as a whole, and its height of 3m does not exceed the limit.

[0060] Therefore, at 50000m 3 When the design air volume is / h, the equipment dimensions (length × width × height) of this embodiment are 10.2m × 3.6m × 3m, which is sufficient to meet the process requirements. For every 10,000 m³ / h increase or decrease in the equipment's design air volume... 3 For every hour of airflow, the total length of the equipment can be increased or decreased by 3 meters, while the height can be controlled within 3 meters and the width within 4 meters. Furthermore, when the airflow is too low, the width can be appropriately reduced to maintain the overall aesthetics of the equipment and ensure its length-to-width ratio. For example, if the designed airflow is 10000 m³ / h... 3 When the speed is / h, the overall size of the equipment can be designed as 5m×2m×3m.

[0061] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. An integrated treatment device for volatile organic compound waste gas, characterized in that, The tower body (1) includes a square cross-section, which is divided into at least two levels of absorption units along its length, and the adjacent absorption units are connected in series by built-in air ducts (2). Each absorption unit is provided with an exhaust gas inlet (101) on the lower part of its side wall and an exhaust gas outlet (102) on the upper part of its side wall opposite to the exhaust gas inlet (101). The bottom end of the air duct (2) is connected to the exhaust gas inlet (101) of the downstream absorption unit, and its top end is connected to the exhaust gas outlet (102) of the upstream absorption unit. Each absorption unit is provided with a horizontally arranged air distribution plate (4) at its lower end. The air distribution plate (4) has several regularly arranged air holes (401). The porosity of the air holes (401) of the air distribution plate (4) increases gradually from the exhaust gas inlet (101) to the opposite side.

2. The integrated volatile organic compound waste gas treatment equipment according to claim 1, characterized in that, The shape of the pore (401) is circular, triangular or square.

3. The integrated volatile organic compound waste gas treatment equipment according to claim 1, characterized in that, Each absorption unit is provided with a liquid collection tank (103), a packing layer (3) and a spray pipe (5) from bottom to top. The highest liquid level in the collection tank (103) is not higher than the lowest point of the exhaust gas inlet (101); The bottom surface of the packing layer (3) is not lower than the highest point of the exhaust gas inlet (101); The spray pipe (5) is provided with several evenly arranged nozzles (501).

4. The integrated volatile organic compound waste gas treatment equipment according to claim 3, characterized in that, The filler layer (3) is provided in at least two layers, and each filler layer (3) can be detachably connected to the inner wall of the absorption unit.

5. The integrated volatile organic compound waste gas treatment equipment according to claim 3, characterized in that, The spray pipe (5) is connected to the circulating water pump (7) through the delivery pipe (6), and the circulating water pump (7) is connected to the liquid collection tank (103) through the circulating pipe (8).

6. The integrated volatile organic compound waste gas treatment equipment according to claim 5, characterized in that, A filter assembly is detachably connected to one end of the circulation pipe (8) near the liquid collection tank (103); The filter assembly includes an outer filter frame and an inner filter frame connected by clamps.

7. The integrated volatile organic compound waste gas treatment equipment according to claim 5, characterized in that, The tower body (1) has an installation cavity (104) independent of the absorption unit on its first side along its length direction. The conveying pipe (6) and the circulating water pump (7) are both installed in the installation cavity (104). The outer wall of the installation cavity (104) is provided with an inspection hole (105).

8. The integrated volatile organic compound waste gas treatment equipment according to claim 3, characterized in that, The liquid collection tank (103) has a water inlet (10), an overflow outlet (9), and a drain outlet (11) arranged sequentially from top to bottom on its side wall.

9. The integrated volatile organic compound waste gas treatment equipment according to claim 3, characterized in that, The tower body (1) has several replacement holes (106) on its second side along its length.

10. The integrated volatile organic compound waste gas treatment equipment according to claim 1, characterized in that, The tower body (1) has an integral frame base (13) at the bottom. The integral frame base (13) includes a grid-shaped steel structure frame and a steel base plate. The steel base plate is fixedly connected to the bottom of the steel structure frame.

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