A tipping paper printing waste gas treatment system

Abstract

This invention belongs to the field of atmospheric control and pollution treatment technology, and specifically relates to a waste gas treatment system for cork paper printing. The system includes a spraying device and an adsorption device. The spraying device comprises a tower body, which consists of an outer cylinder, a middle cylinder, and an inner cylinder from the outside in. The middle cylinder, inner cylinder, first ring plate, and second ring plate form a waste gas pre-cooling chamber; the middle cylinder, inner cylinder, second ring plate, and third ring plate form a waste gas flow equalization chamber; and the middle cylinder, inner cylinder, and third ring plate form a waste gas post-cooling chamber. A heat pipe heat exchange assembly includes a condensing end and an evaporating end. The condensing end is located in the cooling chamber, and the evaporating end is sequentially inserted upwards through the waste gas pre-cooling chamber, the waste gas flow equalization chamber, and the waste gas post-cooling chamber. This invention integrates multiple heat exchange and flow equalization chambers within a limited tower body, organically combining multi-stage filtration, heat pipe cascade heat exchange, cooling and dehumidification, and adsorption recovery into a single unit, abandoning the loose layout of multiple large devices connected in series in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of atmospheric control and pollution treatment technology, and in particular relates to a waste gas treatment system for cork paper printing. Background Technology

[0002] During the printing and drying process of tipping paper (also known as cigarette tipping paper), a large amount of high-temperature waste gas containing volatile organic compounds (VOCs) is generated. With increasingly stringent environmental regulations, effective treatment of this type of waste gas has become a necessity for the industry.

[0003] Currently, in the field of waste gas treatment, especially for waste gas containing particulate matter and volatile organic compounds generated from cork paper printing, combined physical purification processes are commonly used. Typical treatment systems usually consist of centrifugal separation components, multi-stage filtration components, condensation recovery components, and adsorption recovery components connected in series along the waste gas flow direction. Through the combination of various physical methods such as centrifugal separation, staged filtration, and condensation recovery, large particles, dust, and some condensable volatiles in the waste gas can be effectively removed, achieving preliminary purification.

[0004] For example, patent document CN211537045U discloses an exhaust gas treatment device that treats exhaust gas in stages through a series of modular devices. Similarly, patent document CN214764303U also discloses an exhaust gas treatment device for cork paper printing, which also adopts a series layout of multiple large treatment devices connected end to end.

[0005] However, the aforementioned existing technical solutions still have the following obvious shortcomings: Firstly, the aforementioned devices generally employ a combination of multiple independent large-scale equipment connected in series, resulting in a large footprint and loose structure for the entire processing system. For cork paper printing workshops, the production area is usually quite compact, and the waste gas generation points are relatively concentrated. This large-scale series equipment layout not only makes it difficult to flexibly install in existing workshops, but also significantly increases the company's infrastructure and installation costs.

[0006] Secondly, existing series-connected systems lack effective thermal and spatial coordination design among their functional units. For example, high-temperature exhaust gas needs to be cooled and dehumidified before entering the subsequent adsorption unit, but existing systems often place cooling, dehumidification, and adsorption processes in large, isolated devices, resulting in high energy consumption and limited processing efficiency due to pipeline distances and heat dissipation losses between devices.

[0007] Third, the existing equipment has a low degree of integration, failing to achieve efficient integration of multiple physical separation technologies (such as centrifugal separation, multi-stage filtration, heat pipe heat exchange cooling, dehumidification, and adsorption) within a limited space. This results in a large equipment footprint and a lengthy process flow, making it particularly unsuitable for treating waste gas from cork paper printing where the processing volume is relatively controllable but the space is limited. Summary of the Invention

[0008] To address the technical problems existing in the background art, the present invention provides a highly integrated multi-stage combined cork paper printing exhaust gas treatment system. It solves the problems of large equipment footprint, low energy utilization and poor integration in the prior art by setting exhaust gas chamber and heat exchange chamber in layers within a limited shell, and using heat pipes to penetrate the upper and lower layers of the heat exchange chamber to achieve stepped heat exchange and cooling of exhaust gas before and after spraying.

[0009] To achieve the above objectives, the technical solution provided by this invention is as follows: A waste gas treatment system for cork paper printing includes a spray device and an adsorption device connected in sequence. The spraying device includes a tower body, which consists of an outer cylinder, a middle cylinder, and an inner cylinder from the outside to the inside. The inner cylinder and the outer cylinder are separated by a first ring plate, and the bottom side of the middle cylinder is connected to the first ring plate. The middle cylinder and the inner cylinder are separated by a second ring plate and a third ring plate, and the outer cylinder and the middle cylinder are separated by a fourth ring plate. The outer cylinder, the intermediate cylinder, the first ring plate, and the fourth ring plate together form a hot exhaust gas cavity; The intermediate cylinder, inner cylinder, first ring plate, and second ring plate together form a pre-cooling chamber for exhaust gas; the intermediate cylinder, inner cylinder, second ring plate, and third ring plate together form a flow equalization chamber for exhaust gas; the intermediate cylinder, inner cylinder, and third ring plate together form a post-cooling chamber for exhaust gas; and the fourth ring plate and outer cylinder together form an exhaust gas collection chamber. The inner cylinder forms a spray chamber, and a spray assembly is provided at the top of the inner cylinder. A cooling chamber is formed between the outer cylinder, the inner cylinder, and the first annular plate. The inner cylinder has several through slots, air inlets, and air outlets evenly distributed from bottom to top. The through slots are used to connect the cooling chamber and the spray chamber. The air inlets are used to connect the exhaust gas pre-cooling chamber and the spray chamber. The air outlets are used to connect the spray chamber and the exhaust gas after-cooling chamber. The intermediate cylinder has a plurality of first exhaust gas holes and second exhaust gas holes evenly distributed from bottom to top, and the second partition plate has a plurality of third exhaust gas holes evenly distributed around its circumference. The first exhaust gas holes are used to connect the hot exhaust gas cavity and the exhaust gas equalization cavity, the third exhaust gas holes are used to connect the exhaust gas equalization cavity and the exhaust gas precooling cavity, and the second exhaust gas holes are used to connect the exhaust gas postcooling cavity and the exhaust gas collection cavity. The tower body is equipped with a heat pipe heat exchange assembly, which includes a condensing end and an evaporating end. The evaporating end includes a heat pipe and a first heat exchange fin group and a second heat exchange fin group arranged at a fixed distance on the outer wall of the heat pipe. The condensing end is arranged in a cooling chamber, and the evaporating end is arranged upwards through a waste gas pre-cooling chamber, a waste gas equalization chamber, and a waste gas post-cooling chamber. The first heat exchange fin group is arranged in the waste gas pre-cooling chamber, and the second heat exchange fin group is arranged in the waste gas post-cooling chamber.

[0010] Optionally, the hot exhaust gas chamber is provided with an annular coil, and several air inlet pipes are evenly distributed at the upper end of the coil. The air inlet pipes are connected to the fourth annular plate and extend into the exhaust gas collection chamber. The spray device also includes a molecular sieve assembly. Three conical interface boxes are provided on the circumference of the outer cylinder. One interface box is connected to the external hot exhaust gas pipe, and the other two interface boxes are provided with molecular sieve assemblies. Two air outlet pipes are provided on the bottom side of the coil and are respectively connected to the molecular sieve assembly.

[0011] Optionally, the heat pipe is coaxially arranged with the third exhaust port, and the inner diameter of the third exhaust port is larger than the outer diameter of the heat pipe, so that there is a gap between the heat pipe and the third exhaust port to form a channel for exhaust gas to pass through.

[0012] Optionally, the first heat exchange fin group includes two symmetrically arranged first fins, and a plurality of first fins are arranged in a ring along the exhaust gas precooling cavity; the second heat exchange fin group includes a plurality of second fins evenly distributed on the outer wall of the heat pipe, and the number of second fins is greater than the number of first fins.

[0013] Optionally, the molecular sieve assembly includes an L-shaped mounting cylinder and a molecular sieve module. The inner end of the mounting cylinder is vertically supported and fixed on a first ring plate. The horizontal end of the mounting cylinder is located inside an interface box. One side of the mounting cylinder is connected to the interface box via a connecting flange. The molecular sieve module is located inside the horizontal end of the mounting cylinder. An L-shaped first connecting pipe is sleeved inside the vertical end of the mounting cylinder. One end of the first connecting pipe extends vertically upward to the upper side of the mounting cylinder and is connected to an outlet pipe. The other end of the first connecting pipe extends through a cooling cavity to the outside of the outer cylinder and is connected to a second connecting pipe. The second connecting pipe is U-shaped and passes through the interface box to communicate with the vertical end of the mounting cylinder.

[0014] Optionally, a displacement inlet is provided on the outer side of the second connecting pipe, and a displacement outlet is provided on the pipe section of the connecting flange; interface pipes are respectively provided on both sides of the adsorption device, one of which is connected to the connecting flange, and the other is connected to the exhaust branch pipe; valves are provided on the outer end of the first connecting pipe, the interface pipe, the displacement inlet, and the displacement outlet.

[0015] Optionally, a fifth ring plate and a sixth ring plate are arranged from top to bottom in the exhaust gas aftercooling chamber, thereby separating a spray flow equalization chamber on the upper part of the exhaust gas aftercooling chamber and a condensation return chamber below the exhaust gas aftercooling chamber; the air outlet is connected to the spray flow equalization chamber, and at least one drain pipe is provided on the inner wall of the inner cylinder, with one end of the drain pipe connected to the condensation return chamber.

[0016] Optionally, a water-drawing pipe is provided on the outer side of the outer cylinder, and a pump body is provided on the water-drawing pipe. The water-drawing pipe extends into the cooling cavity and extends into the inner cylinder and communicates with the spray assembly.

[0017] Optionally, the inner diameters of the first exhaust port, the third exhaust port, and the inlet port decrease sequentially; a fourth exhaust port is provided on the fifth ring plate, and a return port is provided on the sixth ring plate; the inner diameters of the inlet port, the outlet port, and the second exhaust port are the same; the inner diameter of the outlet port is smaller than the inner diameter of the fourth exhaust port; and the arc segment at the top of the heat pipe is coaxially disposed in the fourth exhaust port; the inner diameter of the fourth exhaust port is larger than the outer diameter of the heat pipe, so that there is a gap between the heat pipe and the third exhaust port to form a channel for exhaust gas to pass through.

[0018] Optionally, the height of the outer cylinder is less than the height of the middle cylinder, and the third ring plate and the fourth ring plate are set on the same horizontal plane; the heights of the exhaust gas pre-cooling chamber, the exhaust gas post-cooling chamber and the exhaust gas flow equalization chamber decrease sequentially.

[0019] The present invention has the following advantages and beneficial effects: I. Highly integrated design, significantly reducing equipment footprint This invention integrates multiple physical treatment units, such as multi-stage filtration, heat pipe cascade heat exchange, cooling and dehumidification, and adsorption recovery, into a single unit by setting up a layered hot waste gas chamber and a heat exchange chamber (waste gas pre-cooling chamber and waste gas post-cooling chamber) within a limited tower body. This eliminates the loose layout of multiple large devices connected in series in existing technologies. The device size of this invention can be significantly reduced compared to traditional series-connected equipment, allowing for flexible installation in compact cork paper printing workshops, significantly reducing infrastructure and installation costs.

[0020] II. Heat pipe cascade heat transfer and energy synergy significantly improve energy efficiency. This invention employs a structural design where a single heat pipe runs through both the upper and lower layers of the heat exchange chamber, achieving tiered heat exchange and cooling of the exhaust gas before and after spraying. The evaporation section of the heat pipe sequentially passes through the lower pre-cooling chamber for treating the high-temperature exhaust gas before spraying and the upper post-cooling chamber for treating the medium-temperature exhaust gas after spraying. Utilizing the phase change heat transfer characteristics of the working fluid inside the heat pipe, the heat from the lower high-temperature exhaust gas is efficiently transferred to the upper layer to maintain the heat exchange driving force of the upper heat pipe section. Simultaneously, the condensation section of the heat pipe is immersed in the bottom cooling chamber, discharging the absorbed heat uniformly into the water. This design eliminates the need for multiple independent heat exchange devices, enabling simultaneous cooling and heat exchange of exhaust gas at different stages. It effectively reduces heat loss in intermediate pipeline transport links, further improving the overall energy utilization rate compared to traditional series systems.

[0021] III. Staged cooling and dehumidification work in tandem to effectively protect the lifespan of adsorption materials. This invention employs a four-stage cooling path: initial pre-cooling via heat exchange between the initial high-temperature exhaust gas and the final dehumidified and cooled exhaust gas; pre-cooling via heat pipes before spraying; spray washing; initial cooling and dehumidification via heat pipes after spraying; and deep dehumidification via molecular sieve components. This ensures that the temperature of the exhaust gas entering the molecular sieve and activated carbon adsorption unit is stably controlled below 40°C, and the relative humidity is significantly reduced. Compared to traditional devices, the adsorption materials (molecular sieve / activated carbon) of this invention avoid direct impact from high-temperature and high-humidity exhaust gases, thus extending their effective service life while maintaining adsorption efficiency and significantly reducing the replacement frequency and operating and maintenance costs of the adsorption materials.

[0022] IV. Optimized airflow organization significantly improves processing efficiency. This invention utilizes a counter-current heat exchange design between a spiral pipe and the exhaust gas chamber, enabling indirect heat exchange between the clean exhaust gas before final emission and the original high-temperature exhaust gas, thus achieving the reuse of waste heat. Simultaneously, the orderly organization and guiding design of the airflow within the chamber ensures uniform distribution of the exhaust gas among the various treatment units, avoiding the air pressure loss caused by pipe bends and long-distance transport in traditional series equipment. By integrating multiple chambers within the tower, multi-stage cooling and dehumidification of the exhaust gas are achieved, while maintaining a compact and rational equipment layout. This significantly reduces the equipment size while ensuring high processing efficiency. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the waste gas treatment system for cork paper printing according to the present invention; Figure 2 This is a front view of the waste gas treatment system for cork paper printing according to the present invention; Figure 3 for Figure 2 The left view; Figure 4 for Figure 2 A cross-sectional view along the AA direction; Figure 5 for Figure 3 A cross-sectional view along the BB direction; Figure 6 for Figure 4 A magnified view of a portion of point a. Figure 7 for Figure 5 A magnified view of a section at point b in the middle; Figure 8 This is a structural diagram of the coil, spray assembly, and heat pipe heat exchange assembly of the present invention; Figure 9 for Figure 8 A magnified view of a section at point c in the middle; Figure 10 This is a structural diagram of the molecular sieve assembly of the present invention; Figure 11 This is a structural diagram of the heat pipe heat exchange assembly of the present invention; Figure 12 This is a structural diagram of the present invention, which incorporates a multi-layered annular plate in the exhaust gas aftercooling chamber.

[0024] Reference numerals: 1-Outer cylinder, 1a-Cooling chamber, 1b-Hot exhaust gas chamber, 1c-Exhaust gas collection chamber, 1d-Exhaust gas pre-cooling chamber, 1e-Exhaust gas post-cooling chamber, 1f-Exhaust gas equalization chamber, 1g-Condensation reflux chamber, 1h-Spray post-emission equalization chamber, 11-Interface box, 2-Intermediate cylinder, 21-First ring plate, 22-Second ring plate, 221-Third exhaust gas hole, 23-Third ring plate, 24-Fourth ring plate, 25-First exhaust gas hole, 26-Second exhaust gas hole, 27-Fifth ring plate, 271-Fourth exhaust gas hole, 28-Sixth ring plate, 281-Reflux hole, 3-Inner cylinder, 31-Pass 32-Inlet, 33-Outlet, 34-Drain pipe, 4-Heat pipe heat exchange assembly, 41-Condensing end, 42-Heat pipe, 43-First heat exchange fin assembly, 44-Second heat exchange fin assembly, 5-Pump body, 51-Water pumping pipe, 52-Spray assembly, 6-Coil, 61-Inlet pipe, 62-Outlet pipe, 7-Molecular sieve assembly, 71-Mounting cylinder, 72-First connecting pipe, 73-Second connecting pipe, 74-Displacement inlet, 75-Connecting flange, 76-Displacement outlet, 77-Molecular sieve module, 8-Adsorption device, 81-Interface pipe, 82-Exhaust branch pipe, 83-Exhaust main pipe. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] Example like Figures 1-12 As shown, a waste gas treatment system for cork paper printing includes a spray device and an adsorption device 8 connected in sequence.

[0028] like Figures 1 to 11 As shown, the spraying device includes a tower body, which consists of an outer cylinder 1, a middle cylinder 2, and an inner cylinder 3 from the outside in. The inner cylinder 3 and the outer cylinder 1 are separated by a horizontal first ring plate 21, and the bottom side of the middle cylinder 2 is connected to the first ring plate 21. The middle cylinder 2 and the inner cylinder 3 are separated by horizontal second ring plates 22 and third ring plates 23, and the outer cylinder 1 and the middle cylinder 2 are separated by a horizontal fourth ring plate 24.

[0029] like Figures 4-7 As shown, the outer cylinder 1, the middle cylinder 2, the first ring plate 21 and the fourth ring plate 24 form a hot exhaust gas cavity 1b, which is a cavity in which untreated raw high-temperature exhaust gas is directly introduced.

[0030] like Figures 4-7 As shown, the intermediate cylinder 2, inner cylinder 3, first ring plate 21 and second ring plate 22 form a pre-cooling chamber 1d for exhaust gas, which is used to pre-cool the exhaust gas in the pre-cooling chamber 1d before spraying treatment.

[0031] like Figures 4-7 As shown, the intermediate cylinder 2, inner cylinder 3, second ring plate 22 and third ring plate 23 form a waste gas equalization cavity 1f. The purpose is to allow the waste gas in the hot waste gas cavity 1b to enter the waste gas equalization cavity 1f for equalization, and then efficiently enter the waste gas pre-cooling cavity 1d for pre-cooling.

[0032] like Figures 4-7 As shown, the intermediate cylinder 2, inner cylinder 3 and third ring plate 23 form a waste gas aftercooling chamber 1e, the purpose of which is to allow the waste gas to enter the waste gas aftercooling chamber 1e for cooling and dehumidification after spraying treatment.

[0033] like Figures 4-7 As shown, the fourth ring plate 24 and the outer cylinder 1 form a waste gas collection cavity 1c, the purpose of which is to allow the waste gas to be cooled and dehumidified in the rear cooling cavity before entering the waste gas collection cavity 1c.

[0034] like Figures 4-7 As shown, the interior of the inner cylinder 3 forms a spray chamber, and a spray assembly 52 is provided at the top of the inner cylinder 3. The spray assembly 52 includes several nozzles.

[0035] like Figures 4-7 As shown, the outer cylinder 1, the inner cylinder 3 and the first ring plate 21 form a cooling cavity 1a. The inner cylinder 3 has several through grooves 31, air inlets 32 and air outlets 33 evenly distributed from bottom to top. The through grooves 31 are used to connect the cooling cavity 1a and the spray cavity. That is, the spray cavity and the interior of the cooling cavity 1a are equipped with cooling water, which also serves as spray water.

[0036] like Figures 4-7 As shown, a water suction pipe 51 is installed on the outer side of the outer cylinder 1, and a pump body 5 is installed on the water suction pipe 51. The water suction pipe 51 extends into the cooling chamber 1a and extends into the inner cylinder 3, connecting with the spray assembly 52 to achieve circulating water suction and spraying. The water in the cooling chamber 1a and the spray chamber needs to be kept at a sufficiently low temperature to ensure that it can spray and cool the hot exhaust gas, while providing a cold source for the heat pipe heat exchange assembly 4. A cooling assembly can be installed on the outer wall of the outer cylinder 1 and extend into the cooling chamber 1a, allowing for selective cooling as needed to ensure that the water temperature is maintained at a reliable temperature.

[0037] like Figures 4-7 As shown, the air inlet 32 ​​is used to connect the exhaust gas precooling chamber 1d and the spray chamber, and the air outlet 33 is used to connect the spray chamber and the exhaust gas aftercooling chamber 1e.

[0038] like Figures 4-7 As shown, the intermediate cylinder 2 has several first exhaust gas holes 25 and second exhaust gas holes 26 evenly distributed from bottom to top, and the second partition plate has several third exhaust gas holes 221 evenly distributed around its circumference. The first exhaust gas holes 25 are used to connect the hot exhaust gas chamber 1b and the exhaust gas equalization chamber 1f, the third exhaust gas holes 221 are used to connect the exhaust gas equalization chamber 1f and the exhaust gas precooling chamber 1d, and the second exhaust gas holes 26 are used to connect the exhaust gas aftercooling chamber 1e and the exhaust gas gathering chamber 1c.

[0039] like Figures 4-7 As shown, a heat pipe heat exchange assembly 4 is installed inside the tower. The heat pipe heat exchange assembly 4 includes a condensing end 41 and an evaporating end. The evaporating end includes a heat pipe 42 and a first heat exchange fin group 43 and a second heat exchange fin group 44 arranged at fixed distances on the outer wall of the heat pipe 42. The condensing end 41 is located in the cooling chamber 1a and is immersed in water. The evaporating end is arranged upwards through the exhaust gas pre-cooling chamber 1d, the exhaust gas equalization chamber 1f, and the exhaust gas post-cooling chamber 1e in sequence. The first heat exchange fin group 43 is located in the exhaust gas pre-cooling chamber 1d, and the second heat exchange fin group 44 is located in the exhaust gas post-cooling chamber 1e.

[0040] Exhaust gas flow path: After the exhaust gas reaches the hot exhaust gas chamber 1b, it enters the exhaust gas equalization chamber 1f through the first exhaust gas hole 25 on the upper side of the hot exhaust gas chamber 1b, and then reaches the exhaust gas pre-cooling chamber 1d through the third exhaust gas hole 221 on the bottom side of the exhaust gas equalization chamber 1f. Then, it enters the bottom end of the spray chamber through the air inlet 32 ​​on the bottom side of the exhaust gas cooling chamber 1a. When the exhaust gas flows upward, it is directly sprayed and cooled by the spray assembly 52. ​​The exhaust gas that reaches the upper side of the spray chamber reaches the exhaust gas post-cooling chamber 1e through the air outlet 33. Then, the exhaust gas reaches the exhaust gas collection chamber 1c through the second exhaust gas hole 26 at the bottom end of the exhaust gas post-cooling chamber 1e.

[0041] This invention integrates multiple physical treatment units, such as multi-stage filtration, heat pipe cascade heat exchange, cooling and dehumidification, and adsorption recovery, into a single unit by setting up a hot exhaust gas chamber 1b and a heat exchange chamber (exhaust gas pre-cooling chamber 1d and exhaust gas post-cooling chamber 1e) in layers within a limited tower body, thus eliminating the loose layout of multiple large devices connected in series in the prior art.

[0042] This invention employs a structural design where a single heat pipe runs through both the upper and lower layers of the heat exchange chamber, achieving tiered heat exchange and cooling of the exhaust gas before and after spraying. The evaporation section of the heat pipe sequentially passes through the lower pre-cooling chamber 1d for treating the high-temperature exhaust gas before spraying and the upper post-cooling chamber 1e for treating the medium-temperature exhaust gas after spraying. Utilizing the phase change heat transfer characteristics of the working fluid inside the heat pipe 42, the heat from the lower high-temperature exhaust gas is efficiently transferred to the upper layer to maintain the heat exchange driving force of the upper heat pipe 42 section. Simultaneously, the condensation section of the heat pipe 42 is immersed in the bottom cooling chamber 1a, uniformly discharging the absorbed heat into the water. This design eliminates the need for multiple independent heat exchange devices, effectively reducing heat loss in intermediate pipeline transport stages. The spraying system and the heat pipe heat exchange components utilize the same water source, enabling compact deep cooling and dehumidification.

[0043] like Figures 4-7As shown, an annular coil 6 is installed inside the hot exhaust gas chamber 1b. Several air inlet pipes 61 are evenly distributed at the upper end of the coil 6. The air inlet pipes 61 are connected to the fourth annular plate 24 and extend into the exhaust gas collection chamber 1c. The spray device also includes a molecular sieve assembly 7. Three conical interface boxes 11 are arranged around the circumference of the outer cylinder 1. One interface box 11 is connected to the external hot exhaust gas pipeline, and the other two interface boxes 11 are equipped with molecular sieve assemblies 7. Two exhaust pipes 62 are arranged on the bottom side of the coil 6, and the exhaust pipes 62 are respectively connected to the molecular sieve assembly 7. The temperature of the exhaust gas reaching the exhaust gas collection chamber 1c is further reduced. It is then transported through coil 6 and exchanges heat with the original high-temperature exhaust gas. The purpose of this step is twofold: firstly, to slightly raise the temperature of the cooled and dehumidified exhaust gas, but to ensure that its temperature is lower than the requirements of the subsequent adsorption components. Generally, the exhaust gas after heat exchange needs to ensure that the temperature of the exhaust gas entering the molecular sieve and activated carbon adsorption unit is stably controlled below 40℃; secondly, to initially cool the original hot exhaust gas in the first stage, thereby ensuring the subsequent step-by-step and multi-stage cooling and dehumidification.

[0044] This invention employs a four-stage cooling path: initial pre-cooling via heat exchange between the initial high-temperature exhaust gas and the final dehumidified and cooled exhaust gas; pre-cooling via the heat pipe heat exchange component 4 before spraying; washing via the spray component 52; and primary cooling and dehumidification via the heat pipe heat exchange component 4 after spraying, combined with deep dehumidification via the molecular sieve component. This ensures that the temperature of the exhaust gas entering the molecular sieve and activated carbon adsorption unit is stably controlled below 40°C, and the relative humidity is significantly reduced. This extends the working cycle of the molecular sieve while maintaining dehumidification efficiency. Compared to traditional devices, the adsorption materials (molecular sieve / activated carbon) of this invention avoid direct impact from high-temperature and high-humidity exhaust gas, further extending their effective service life while maintaining adsorption efficiency. This significantly reduces the replacement frequency and operating and maintenance costs of the adsorption materials, while ensuring the efficiency of exhaust gas spray cooling.

[0045] Meanwhile, the orderly organization and guiding design of the airflow within the chambers ensures the uniform distribution of exhaust gas among the various treatment units, avoiding the air pressure loss caused by pipe bends and long-distance transportation in traditional series equipment. By integrating multiple chambers within the tower, multi-stage cooling and dehumidification of the exhaust gas are achieved, while ensuring the compactness and rationality of the equipment layout. This significantly reduces the equipment size while efficiently guaranteeing exhaust gas treatment efficiency.

[0046] like Figures 4-7 As shown, the heat pipe 42 and the third exhaust port 221 are coaxially arranged. The inner diameter of the third exhaust port 221 is larger than the outer diameter of the heat pipe 42, so that there is a gap between the heat pipe 42 and the third exhaust port 221 to form a channel for exhaust gas to pass through. In this way, when the exhaust gas passes through the third exhaust port 221, it is evenly distributed to the circumference of the heat pipe 42, thereby ensuring heat exchange efficiency.

[0047] like Figures 4 to 11As shown, the first heat exchange fin group 43 includes two symmetrically arranged first fins, and several first fins are arranged in a ring along the exhaust gas precooling chamber 1d; the second heat exchange fin group 44 includes several second fins evenly distributed on the outer wall of the heat pipe 42, and the number of second fins is greater than the number of first fins. By optimizing the heat exchange area and adjusting the heat exchange efficiency, the heat exchange efficiency of the upper and lower chambers is ensured, so as to achieve efficient heat exchange of the original high-temperature exhaust gas and ensure the heat exchange and dehumidification efficiency of the medium-temperature exhaust gas after spraying.

[0048] After passing through the pre-cooling chamber 1d, the temperature of the high-temperature exhaust gas drops significantly (achieving pre-cooling), which not only improves the efficiency of subsequent spray washing but also reduces the overall heat load of the system. The pre-cooled exhaust gas undergoes further cooling and dust removal through spray washing, but becomes saturated with moisture. If it directly enters the subsequent molecular sieve or activated carbon bed, the high humidity will compete with VOC molecules for adsorption sites, severely reducing adsorption efficiency. The saturated moisture enters the pre-cooling chamber 1e for deep cooling and dehumidification, and then the cooler, drier exhaust gas sequentially enters the molecular sieve adsorption and activated carbon adsorption processes.

[0049] Regarding the operation of heat pipe 42, "temperature difference" means "heat transfer capability". The temperature of printing exhaust gas is usually high before entering the spray (e.g., 80-110℃ or even higher). After the first pre-cooling and spraying, the temperature will drop significantly (usually controlled at around 40-50℃), but it is still higher than the ambient temperature cooling water at the bottom (the water temperature is usually around 20-30℃).

[0050] The working principle of heat pipe 42 is temperature difference driven – the temperature of the evaporation section (in contact with exhaust gas) must be higher than that of the condensation section (in contact with water). As long as this temperature difference exists, the heat of the exhaust gas after spraying can be continuously "transferred" to the water. Thus, a single heat pipe 42 can exchange heat between exhaust gases at different temperatures (before and after spraying), thereby achieving the functions of pre-cooling before spraying and cooling and dehumidification after spraying.

[0051] like Figures 1 to 11 As shown, the molecular sieve assembly 7 includes an L-shaped mounting cylinder 71 and a molecular sieve module 77. The inner end of the mounting cylinder 71 is vertically supported and fixed on the first ring plate 21. The horizontal end of the mounting cylinder 71 is located inside the interface box 11. One side of the mounting cylinder 71 is connected to the interface box 11 through a connecting flange 75, thereby completing the installation of the mounting cylinder 71. The molecular sieve module 77 is provided inside the horizontal end of the mounting cylinder 71. An L-shaped first connecting pipe 72 is sleeved inside the vertical end of the mounting cylinder 71. One end of the first connecting pipe 72 extends vertically upward to the upper side of the mounting cylinder 71 and is connected to the air outlet pipe 62. The other end of the first connecting pipe 72 extends through the cooling cavity 1a to the outside of the outer cylinder 1 and is connected to the second connecting pipe 73. The second connecting pipe 73 is U-shaped and passes through the interface box 11 to communicate with the vertical end of the mounting cylinder 71.

[0052] With this design, the exhaust gas enters the first connecting pipe 72 and the second connecting pipe 73 through the exhaust pipe 62 at the bottom of the coil 6, and then reaches the mounting cylinder 71. After flowing through the molecular sieve module 77, it reaches the subsequent adsorption device 8. The entire molecular sieve assembly 7 is compactly arranged in the tower body, which also facilitates the regeneration of the molecular sieve.

[0053] like Figures 4-7 As shown, a displacement inlet 74 is provided on the outer side of the second connecting pipe 73, and a displacement outlet 76 is provided on the pipe section of the connecting flange 75; interface pipes 81 are respectively provided on both sides of the adsorption device 8, one interface pipe 81 is connected to the connecting flange 75, and the other interface pipe 81 is connected to the exhaust branch pipe 82. The exhaust branch pipes 82 on both sides converge into the exhaust main pipe 83, which is fixed to the top of the inner cylinder 3. Valves are provided on the outer end of the first connecting pipe 72, the interface pipes 81, the displacement inlet 74, and the displacement outlet 76.

[0054] When the molecular sieve is working normally, the valves at the outer end of the first connecting pipe 72 and the interface pipe 81 are opened, and the valves on the displacement inlet 74 and the displacement outlet 76 are closed, so that the waste gas flows through the molecular sieve module 77 and then into the adsorption device 8.

[0055] During molecular sieve replacement regeneration, the valves at the outer end of the first connecting pipe 72 and the interface pipe 81 are closed, while the valves on the replacement air inlet 74 and the replacement air outlet 76 are opened, and an external dry air source is introduced, allowing the dry air source to flow through the molecular sieve module 77 for replacement, thereby realizing the regeneration operation of the molecular sieve module 77.

[0056] In this invention, the molecular sieve assembly 7 is designed with a compact structure, which can not only position and install the coil 6, but also position and install the installation cylinder 71. The entire assembly is integrated into the tower body, and each valve is led out to the outside of the tower body, so as to achieve convenient installation and control.

[0057] like Figures 4-7 As shown, the inner diameters of the first exhaust port 25, the third exhaust port 221, and the air inlet port 32 decrease sequentially to achieve gradual uniform flow of exhaust gas and better achieve pre-cooling and spray cooling.

[0058] like Figure 12 As shown, furthermore, a fifth ring plate 27 and a sixth ring plate 28 are arranged from top to bottom in the exhaust gas aftercooling chamber 1e, thereby separating the spray-fed equalization chamber 1h above the exhaust gas aftercooling chamber 1e and the condensation reflux chamber 1g below the exhaust gas aftercooling chamber 1e. The vent 33 is connected to the spray-fed equalization chamber 1h, and at least one drain pipe 34 is provided on the inner wall of the inner cylinder 3 (e.g., Figure 4 As shown), one end of the drain pipe 34 is connected to the condensate return chamber 1g, which is used to periodically drain the condensate in the condensate return chamber 1g.

[0059] like Figure 12 As shown, the fifth ring plate 27 has a fourth exhaust gas hole 271, and the sixth ring plate 28 has a return flow hole 281. The inner diameters of the air inlet 32, the air outlet 33, and the second exhaust gas hole 26 are the same. The inner diameter of the air outlet 33 is smaller than the inner diameter of the fourth exhaust gas hole 271. The arc-shaped section at the top of the heat pipe 42 is coaxially arranged in the fourth exhaust gas hole 271. The inner diameter of the fourth exhaust gas hole 271 is larger than the outer diameter of the heat pipe 42, so that there is a gap between the heat pipe 42 and the third exhaust gas hole 221 to form a channel for exhaust gas to pass through. After the exhaust gas reaches the spray, it achieves uniform flow in the flow equalization chamber for 1 hour. It flows directly to the top heat pipe 42 through the fourth exhaust gas hole 271. Due to the arc-shaped (or tapered) design of the top of the heat pipe 42, it is uniformly guided to the second heat exchange fin group 44 on the side. After cooling and dehumidification, the exhaust gas flows into the exhaust gas collection chamber 1c through the second exhaust gas hole 26 on the side, while the condensate can be discharged into the condensate return chamber 1g through the return hole 281.

[0060] As a preferred design of the present invention, the height of the outer cylinder 1 is less than the height of the middle cylinder 2, and the third ring plate 23 and the fourth ring plate 24 are set on the same horizontal plane; the heights of the exhaust gas pre-cooling chamber 1d, the exhaust gas post-cooling chamber 1e and the exhaust gas flow equalization chamber 1f decrease sequentially.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A waste gas treatment system for cork paper printing, characterized in that: It includes a spraying device and an adsorption device connected in sequence; The spraying device includes a tower body, which consists of an outer cylinder, a middle cylinder, and an inner cylinder from the outside to the inside. The inner cylinder and the outer cylinder are separated by a first ring plate, and the bottom side of the middle cylinder is connected to the first ring plate. The middle cylinder and the inner cylinder are separated by a second ring plate and a third ring plate, and the outer cylinder and the middle cylinder are separated by a fourth ring plate. The outer cylinder, the intermediate cylinder, the first ring plate, and the fourth ring plate together form a hot exhaust gas cavity; The intermediate cylinder, inner cylinder, first ring plate, and second ring plate together form a pre-cooling chamber for exhaust gas; the intermediate cylinder, inner cylinder, second ring plate, and third ring plate together form a flow equalization chamber for exhaust gas; the intermediate cylinder, inner cylinder, and third ring plate together form a post-cooling chamber for exhaust gas; and the fourth ring plate and outer cylinder together form an exhaust gas collection chamber. The inner cylinder forms a spray chamber, and a spray assembly is provided at the top of the inner cylinder. A cooling chamber is formed between the outer cylinder, the inner cylinder, and the first annular plate. The inner cylinder has several through slots, air inlets, and air outlets evenly distributed from bottom to top. The through slots are used to connect the cooling chamber and the spray chamber. The air inlets are used to connect the exhaust gas pre-cooling chamber and the spray chamber. The air outlets are used to connect the spray chamber and the exhaust gas after-cooling chamber. The intermediate cylinder has a plurality of first exhaust gas holes and second exhaust gas holes evenly distributed from bottom to top, and the second partition plate has a plurality of third exhaust gas holes evenly distributed around its circumference. The first exhaust gas holes are used to connect the hot exhaust gas cavity and the exhaust gas equalization cavity, the third exhaust gas holes are used to connect the exhaust gas equalization cavity and the exhaust gas precooling cavity, and the second exhaust gas holes are used to connect the exhaust gas postcooling cavity and the exhaust gas collection cavity. The tower body is equipped with a heat pipe heat exchange assembly, which includes a condensing end and an evaporating end. The evaporating end includes a heat pipe and a first heat exchange fin group and a second heat exchange fin group arranged at a fixed distance on the outer wall of the heat pipe. The condensing end is arranged in a cooling chamber, and the evaporating end is arranged upwards through a waste gas pre-cooling chamber, a waste gas equalization chamber, and a waste gas post-cooling chamber. The first heat exchange fin group is arranged in the waste gas pre-cooling chamber, and the second heat exchange fin group is arranged in the waste gas post-cooling chamber.

2. The waste gas treatment system for cork paper printing according to claim 1, characterized in that: The hot exhaust gas chamber is equipped with an annular coil, and several air inlet pipes are evenly distributed at the upper end of the coil. The air inlet pipes are connected to the fourth annular plate and extend into the exhaust gas collection chamber. The spray device also includes a molecular sieve assembly. Three conical interface boxes are arranged on the circumference of the outer cylinder. One interface box is connected to the external hot exhaust gas pipeline, and the other two interface boxes are equipped with molecular sieve assemblies. Two air outlet pipes are arranged on the bottom side of the coil and are respectively connected to the molecular sieve assembly.

3. The waste gas treatment system for cork paper printing according to claim 1, characterized in that: The heat pipe is coaxially arranged with the third exhaust port, and the inner diameter of the third exhaust port is larger than the outer diameter of the heat pipe, so that there is a gap between the heat pipe and the third exhaust port to form a channel for exhaust gas to pass through.

4. The waste gas treatment system for cork paper printing according to claim 1, characterized in that: The first heat exchange fin group includes two symmetrically arranged first fins, and a plurality of first fins are arranged in a ring along the exhaust gas precooling cavity; the second heat exchange fin group includes a plurality of second fins evenly distributed on the outer wall of the heat pipe, and the number of second fins is greater than the number of first fins.

5. The waste gas treatment system for cork paper printing according to claim 2, characterized in that: The molecular sieve assembly includes an L-shaped mounting cylinder and a molecular sieve module. The inner end of the mounting cylinder is vertically supported and fixed on a first ring plate. The horizontal end of the mounting cylinder is located inside an interface box. One side of the mounting cylinder is connected to the interface box via a connecting flange. The molecular sieve module is located inside the horizontal end of the mounting cylinder. An L-shaped first connecting pipe is sleeved inside the vertical end of the mounting cylinder. One end of the first connecting pipe extends vertically upward to the upper side of the mounting cylinder and is connected to an outlet pipe. The other end of the first connecting pipe extends through a cooling cavity to the outside of the outer cylinder and is connected to a second connecting pipe. The second connecting pipe is U-shaped and passes through the interface box to communicate with the vertical end of the mounting cylinder.

6. The waste gas treatment system for cork paper printing according to claim 5, characterized in that: The second connecting pipe has a displacement air inlet on its outer side, and the connecting flange has a displacement air outlet on its pipe section; the adsorption device has interface pipes on both sides, one of which is connected to the connecting flange and the other is connected to the exhaust branch pipe; valves are provided on the outer end of the first connecting pipe, the interface pipe, the displacement air inlet and the displacement air outlet.

7. The waste gas treatment system for cork paper printing according to claim 1, characterized in that: The exhaust gas cooling chamber is provided with a fifth ring plate and a sixth ring plate arranged from top to bottom, thereby separating a spray flow equalization chamber on the upper part of the exhaust gas cooling chamber and a condensation return chamber below the exhaust gas cooling chamber; the air outlet is connected to the spray flow equalization chamber, and the inner wall of the inner cylinder is provided with at least one drain pipe, one end of which is connected to the condensation return chamber.

8. The waste gas treatment system for cork paper printing according to claim 1, characterized in that: A water pumping pipe is provided on the outer side of the outer cylinder, and a pump body is provided on the water pumping pipe. The water pumping pipe extends into the cooling cavity and extends into the inner cylinder and communicates with the spray assembly.

9. The waste gas treatment system for cork paper printing according to claim 7, characterized in that: The inner diameters of the first exhaust port, the third exhaust port, and the inlet port decrease sequentially. A fourth exhaust port is provided on the fifth ring plate, and a return port is provided on the sixth ring plate. The inner diameters of the inlet port, the outlet port, and the second exhaust port are the same. The inner diameter of the outlet port is smaller than the inner diameter of the fourth exhaust port. The arc segment at the top of the heat pipe is coaxially arranged in the fourth exhaust port. The inner diameter of the fourth exhaust port is larger than the outer diameter of the heat pipe, so that there is a gap between the heat pipe and the third exhaust port to form a channel for exhaust gas to pass through.

10. The waste gas treatment system for cork paper printing according to claim 1 or 7, characterized in that: The height of the outer cylinder is less than the height of the middle cylinder, and the third ring plate and the fourth ring plate are set on the same horizontal plane; the heights of the exhaust gas pre-cooling chamber, the exhaust gas post-cooling chamber and the exhaust gas flow equalization chamber decrease sequentially.

Images