Low-carbon coupling purification system for inorganized volatile organic compounds
By designing a low-carbon coupled purification system for fugitive volatile organic compounds, employing a three-stage catalytic reaction purification mechanism and various filter particles, combined with sensors and electromagnetic gate control, the problems of slow preheating, low purification efficiency, and low waste heat utilization rate of catalytic combustion devices are solved, achieving high-efficiency purification and catalyst stability.
Patent Information
- Application Number
- CN202511576322.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-31
- Publication Date
- 2026-01-09
AI Technical Summary
Existing catalytic combustion purification devices suffer from problems such as poor catalyst activity at low humidity, easy sintering at high temperatures, stress shedding due to poisoning, low purification efficiency, low waste heat utilization, slow preheating of waste gas, and difficulty in collecting fugitive emissions.
A low-carbon coupled purification system for fugitive volatile organic compounds was designed. It adopts a three-stage catalytic reaction purification mechanism, using activated carbon, ceramic or metal carrier coated with precious metal catalyst and fine particulate filter element. Combined with sensor monitoring and electromagnetic gate control, it can achieve rapid preheating and efficient purification.
It solves the problems of slow start-up of catalytic reactor, slow preheating of waste gas and fugitive emissions, improves purification efficiency and waste heat utilization, extends catalyst life and reduces fugitive emissions of organic matter.
Smart Images
Figure CN121297514A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of purification system technology, specifically relating to a low-carbon coupled purification system for fugitive volatile organic compounds. Background Technology
[0002] Catalysts and catalytic combustion purification equipment are mainly used in industries that are dominated by VOCs emissions, such as petrochemicals, printing, electronics, coating, tobacco and pharmaceuticals. At present, commercial catalysts at home and abroad have problems such as poor activity at low humidity, easy sintering at high temperature, easy poisoning in complex waste gas environments, and short actual life.
[0003] Meanwhile, when the system temperature fluctuates significantly, large stress is easily generated between the active phase of the catalyst and the support, leading to coating peeling and shortening the catalyst's service life.
[0004] However, catalytic combustion purification facilities generally suffer from the following problems: First, the catalytic reactor starts up slowly, requiring 1-2 hours from preheating the exhaust gas to starting the catalytic reaction, which leads to the exhaust gas exceeding the standard in the early stage. Second, improper catalyst stacking can lead to short circuits and channeling in the exhaust gas flow, reducing purification efficiency. Third, the waste heat recovery and utilization rate of traditional catalytic combustion devices is poor, resulting in high overall energy consumption; Fourth, there are fugitive emissions of volatile organic compounds during production, which are difficult to collect.
[0005] Therefore, the development of a highly efficient and stable catalyst and a low-carbon coupled purification system for complex waste gas environments, and the solution to engineering problems such as slow preheating, high energy consumption, and difficulty in collection in practical applications of catalytic combustion devices, will significantly reduce the overall cost of VOCs control and improve the overall technical level of VOCs catalytic combustion processes. Summary of the Invention
[0006] The purpose of this invention is to provide a simple and rationally designed low-carbon coupled purification system for fugitive volatile organic compounds in order to solve the above-mentioned problems, and to address engineering issues such as slow preheating, high energy consumption, and difficulty in collection of catalytic combustion devices in practical applications.
[0007] The present invention achieves the above objectives through the following technical solutions: A low-carbon coupled purification system for fugitive volatile organic compounds includes: The second purification box and the first purification box are connected by a bent pipe at the upper end of the first purification box, which communicates with the interior of the upper end of the second purification box. The first purification box is equipped with a first bend in the hot water exchange pipe. The second purification box is equipped with a first chamber, a second chamber, and a third chamber arranged sequentially from the side closest to the first purification box to the side furthest from the first purification box. The upper end of the first chamber is connected to the bend in the pipe, the lower end of the first chamber is connected to the lower end of the second chamber, and the upper end of the second chamber is connected to the lower end of the third chamber. The first chamber and the second chamber are respectively equipped with a second bend in the hot water exchange pipe and a third bend in the hot water exchange pipe. Multiple first, second, and third bend hot water exchange pipes are provided, and the multiple first, second, and third bend hot water exchange pipes are distributed at equal distances along the height direction of the first and second purification boxes; The bottom of the first, second, and third bend hot water pipes is fitted with filter plates. The first, second, and third bend hot water pipes are all horizontally distributed and have a back-and-forth bending pipe structure. Multiple filter plates are provided, and each filter plate is snapped into the bend gap of the first, second, and third bend hot water pipes.
[0008] As a further optimization of the present invention, the filter plate includes a filter element, the filter element has a filter cavity inside, the upper and lower surfaces of the filter element are provided with filter holes, the filter holes are connected to the interior of the filter cavity, and the filter cavity is filled with filter particles. The filter particles corresponding to the first bend in the hot water pipe are activated carbon particles; The filter particles corresponding to the second bend in the hot water exchange pipe are supported by a ceramic or metal carrier, coated with a precious metal catalyst, and a layer of nanomaterial is coated on the surface of the precious metal catalyst. A fine particle filter cartridge is used for the filter particles corresponding to the location of the third bend in the hot water pipe.
[0009] As a further optimization of the present invention, a sensing unit is installed on the upper inner wall of the second chamber. The sensing unit uses an integrated catalytic combustion gas sensor, a laser dust sensor, and a fixed VOCs gas detector. The catalytic combustion gas sensor detects gas concentration by detecting changes in resistance. The laser dust sensor monitors the dust concentration in the exhaust gas in real time based on the principle of laser scattering. The fixed VOCs gas detector is used to monitor the VOCs concentration in exhaust gas in real time.
[0010] As a further optimization of the present invention, a first electromagnetic door is provided on one side of the bottom of the second purification box, and an inclined channel is provided on the other side of the bottom of the second purification box. A second electromagnetic door is provided at the end of the inclined channel, and a return channel is also provided at the end of the inclined channel. The return channel is connected to the lower end of the first purification box, and the first electromagnetic door and the second electromagnetic door are respectively provided below the third chamber.
[0011] As a further optimization of the present invention, both the first electromagnetic gate and the second electromagnetic gate are electromagnetic gates, and the first electromagnetic gate, the second electromagnetic gate and the sensing unit are connected by a single-chip microcomputer of model STM32F103C8T6.
[0012] As a further optimization of the present invention, the bottom of the second purification box is provided with a valve port, and the bottom of the second purification box has a funnel-shaped structure.
[0013] As a further optimization of the present invention, a hot water supply mechanism is provided at the upper end of the second purification box. The hot water supply mechanism is connected to the first bend hot water exchange pipe, the second bend hot water exchange pipe and the third bend hot water exchange pipe. The hot water supply mechanism is used to supply circulating hot water to the first bend hot water exchange pipe, the second bend hot water exchange pipe and the third bend hot water exchange pipe. The hot water supply system includes a hot water tank, a solar heating or electric heating device, and a circulating water pump.
[0014] As a further optimization of the present invention, the lower end of the first purification box has an inlet pipe for the waste gas to enter, and a one-way valve should be installed in both the inlet pipe and the return channel to allow the gas to enter the first purification box in one direction.
[0015] The beneficial effects of this invention are as follows: This invention solves the problem of slow start-up of catalytic reactors, requiring 1-2 hours for exhaust gas preheating to start the catalytic reaction, which leads to excessive exhaust gas levels in the early stages. It also avoids the problem of large-scale fugitive emissions of volatile organic compounds and the difficulty in collection. Volatile organic compounds can be repeatedly filtered and purified to meet the standards before being discharged. When the hot water supply unit supplies hot water to the first, second, and third bend hot water exchange pipes, it can quickly heat the filter particles corresponding to the positions of the first, second, and third bend hot water exchange pipes, thereby improving the filtration effect of activated carbon particles and fine particle filter elements. It can also prevent carbon buildup and poisoning on the catalyst surface, further decompose residual organic matter, reduce fugitive volatile organic compounds, and improve purification efficiency. The pulsed fluid generated by the periodic changes in fluid velocity and pressure drives the first, second, and third bends of the hot water exchange pipe to vibrate to a certain extent. When they vibrate irregularly, they can also help the impurities filtered in the filter plate to fall off, thereby improving the purification efficiency. In this invention, the waste heat from the exhaust gas can also be used to heat and keep warm the water in the first, second, and third bend heat exchange pipes, thereby improving the utilization rate of waste heat. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the low-carbon coupling purification system for fugitive volatile organic compounds of the present invention; Figure 2 This is a cross-sectional view of the low-carbon coupling purification system for fugitive volatile organic compounds of the present invention; Figure 3 This is a bottom view of the first tortuous hot water pipe of the present invention; Figure 4 This is a cross-sectional view of the first tortuous hot water pipe of the present invention; Figure 5 This is the invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle.
[0017] In the diagram: 1. Second purification box; 2. First purification box; 3. Hot water supply mechanism; 4. Support frame; 5. Bend; 6. First bend hot water exchange pipe; 7. Inlet pipe; 8. Sensing unit; 9. First chamber; 10. Second chamber; 11. Second bend hot water exchange pipe; 12. Third bend hot water exchange pipe; 13. Third chamber; 14. First electromagnetic door; 15. Second electromagnetic door; 16. Inclined channel; 17. Valve port; 18. Return channel; 19. Filter plate; 20. Filter element; 21. Filter chamber; 22. Filter hole; 23. Filter particles. Detailed Implementation
[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0019] like Figures 1 to 5As shown, a low-carbon coupled purification system for fugitive volatile organic compounds includes a second purification chamber 1 and a first purification chamber 2. The lower end of the first purification chamber 2 has an inlet pipe 7 for allowing waste gas to enter. The upper end of the first purification chamber 2 is provided with a bent pipe 5, which communicates with the interior of the upper end of the second purification chamber 1. The bent pipe 5 is L-shaped. A first electromagnetic door 14 is provided on one side of the bottom of the second purification chamber 1, and an inclined channel 16 is provided on the other side of the bottom of the second purification chamber 1. A second electromagnetic door 15 is provided at the end of the inclined channel 16, and a return channel 18 is also connected to the end of the inclined channel 16. The return channel 18 communicates with the lower end of the first purification chamber 2. The interior of the chamber 1 is equipped with a sensing unit 8, which monitors whether the exhaust gas meets the emission standards. If it meets the emission standards, the first electromagnetic door 14 opens to discharge the gas. If it does not meet the emission standards, the second electromagnetic door 15 opens, and the gas enters the bottom of the first purification chamber 2 again through the inclined channel 16 and the return channel 18 for re-purification and filtration. This solves the problem of slow start-up of the catalytic reactor and the need for 1-2 hours for exhaust gas preheating to start the catalytic reaction, which leads to excessive exhaust gas in the early stage. It also avoids the problem of large-scale fugitive emissions of volatile organic compounds and the difficulty in collection. Volatile organic compounds can be repeatedly filtered and purified to meet the standards before being discharged.
[0020] This invention aims to improve the purification efficiency of VOCs by featuring a three-stage catalytic reaction purification mechanism. Each stage of the catalytic reaction purification mechanism is equipped with different filter elements to achieve efficient filtration and treatment of different pollutants.
[0021] refer to Figure 2 As shown, a first bendable hot water exchange pipe 6 is provided inside the first purification box 2. The second purification box 1 is provided with a first chamber 9, a second chamber 10 and a third chamber 13 arranged sequentially from the side closest to the first purification box 2 away from the first purification box 2. The upper end of the first chamber 9 is connected to the bend pipe 5, the lower end of the first chamber 9 is connected to the lower end of the second chamber 10, and the upper end of the second chamber 10 is connected to the lower end of the third chamber 13. The first electromagnetic door 14 and the second electromagnetic door 15 are respectively arranged below the third chamber 13. The second bendable hot water exchange pipe 11 and the third bendable hot water exchange pipe 12 are respectively arranged inside the first chamber 9 and the second chamber 10.
[0022] Multiple first-bend hot water exchange pipes 6, second-bend hot water exchange pipes 11, and third-bend hot water exchange pipes 12 are provided. These multiple first-bend hot water exchange pipes 6, second-bend hot water exchange pipes 11, and third-bend hot water exchange pipes 12 are distributed at equal distances along the height direction of the first purification box 2 and the second purification box 1. A hot water supply mechanism 3 is provided at the upper end of the second purification box 1. The hot water supply mechanism 3 is connected to the first-bend hot water exchange pipes 6, second-bend hot water exchange pipes 11, and third-bend hot water exchange pipes 12. The hot water supply mechanism 3 is used to supply circulating hot water to the first-bend hot water exchange pipes 6, second-bend hot water exchange pipes 11, and third-bend hot water exchange pipes 12.
[0023] refer to Figures 3 to 5 As shown, filter plates 19 are attached to the bottom of the first bend water exchange pipe 6, the second bend water exchange pipe 11, and the third bend water exchange pipe 12. The first bend water exchange pipe 6, the second bend water exchange pipe 11, and the third bend water exchange pipe 12 are all horizontally distributed and have a back-and-forth bending pipe structure. Multiple filter plates 19 are provided, and multiple filter plates 19 are respectively snapped into the bending gaps of the first bend water exchange pipe 6, the second bend water exchange pipe 11, and the third bend water exchange pipe 12. The filter plate 19 includes a filter element 20, and a filter cavity 21 is provided inside the filter element 20. Filter holes 22 are provided on the upper and lower surfaces of the filter element 20. The filter holes 22 are connected to the interior of the filter cavity 21, and the filter cavity 21 is filled with filter particles 23. The filter particles 23 corresponding to the first bend in the hot water exchange pipe 6 are activated carbon particles, used to adsorb some organic matter and odors, reducing the organic matter load entering the catalytic reactor. At room temperature, the granular filter element can effectively remove more than 99.97% of particles larger than 0.3 microns, while the activated carbon filter element can adsorb most organic matter and odors. Effect under heating conditions: Under heating conditions, the adsorption capacity of activated carbon may decrease slightly, but the filtration effect of the granular filter element remains unaffected.
[0024] The filter particles 23 corresponding to the second bend in the hot water exchange pipe 11 use a ceramic or metal carrier and are coated with a precious metal catalyst, such as Pt, Pd, Rh, etc.; a layer of nanomaterials, such as nano titanium dioxide, is coated on the catalyst surface to enhance the catalyst's resistance to poisoning and sintering; the catalyst has the highest activity under heating conditions and can efficiently convert VOCs into harmless substances; typically, the purification efficiency of the catalytic combustion reactor can reach over 95%; the effect under heating conditions: under heating conditions, the activity of the catalyst is significantly improved, and the purification efficiency is higher; at the same time, high temperature helps to prevent carbon deposition and poisoning on the catalyst surface and extend the service life of the catalyst.
[0025] The filter 23 corresponding to the third bend in the hot water pipe 12 uses a fine particle filter element made of ultra-fine fiber material to remove residual particulate matter. At room temperature, the high-efficiency activated carbon filter element can adsorb residual organic matter, while the fine particle filter element can remove more than 99.99% of particles larger than 0.1 microns. Effect under heating: Under heating conditions, the adsorption capacity of activated carbon may decrease slightly, but the filtration effect of the fine particle filter element is not affected. At the same time, high temperature helps to further decompose residual organic matter and improve purification efficiency.
[0026] Therefore, when the hot water supply unit 3 supplies hot water to the first bend hot water exchange pipe 6, the second bend hot water exchange pipe 11, and the third bend hot water exchange pipe 12, it can quickly heat the filter particles 23 corresponding to the positions of the first bend hot water exchange pipe 6, the second bend hot water exchange pipe 11, and the third bend hot water exchange pipe 12, thereby improving the filtration effect of the activated carbon particles and fine particle filter core, preventing carbon deposition and poisoning on the catalyst surface, further decomposing residual organic matter, reducing fugitive volatile organic compounds, and improving purification efficiency.
[0027] It should be noted that the hot water supply unit 3 uses a common hot water pump on the market, which has a hot water tank and solar heating or electric heating device, as well as a circulating water pump. These are common technologies and will not be described in detail here.
[0028] In this invention, the sensing unit 8 is installed on the inner wall above the second chamber 10. The sensing unit 8 uses an integrated catalytic combustion gas sensor, a laser dust sensor, and a fixed VOCs gas detector. The catalytic combustion gas sensor uses a catalyst to burn combustible gas, releasing heat to change the element temperature, causing a change in its resistance. Gas concentration is detected by detecting the change in resistance. The laser dust sensor monitors the dust concentration in the exhaust gas in real time using the principle of laser scattering. The fixed VOCs gas detector is used to monitor the VOCs concentration in the exhaust gas in real time and has functions such as explosion-proof design, real-time concentration display, low / high alarm, and linkage control. The catalytic combustion gas sensor, laser dust sensor, and fixed VOCs gas detector are all commercially available products.
[0029] Furthermore, both the first electromagnetic door 14 and the second electromagnetic door 15 are electromagnetic doors, and they are connected to the sensing unit 8 via a microcontroller of model STM32F103C8T6. When the sensing unit 8 detects that the exhaust gas meets the emission standard, it controls the first electromagnetic door 14 to open and discharge the gas through the microcontroller. If the exhaust gas does not reach the emission surface, the first electromagnetic door 14 is closed and the second electromagnetic door 15 is opened at the same time, so that the gas enters the bottom of the first purification box 2 for circulation purification through the inclined channel 16 and the return channel 18 in sequence, resulting in high processing efficiency.
[0030] It is worth mentioning that a valve port 17 is provided at the bottom of the second purification box 1, and the bottom of the second purification box 1 has a funnel-shaped structure, which can be used to collect impurities that fall out of the filter plate 19 corresponding to the second bend hot water exchange pipe 11 and the third bend hot water exchange pipe 12. Opening the valve port 17 facilitates regular cleaning and reduces the maintenance cycle.
[0031] Meanwhile, multiple filter plates 19 are respectively snapped into the bends of the first bend-type hot water exchange pipe 6, the second bend-type hot water exchange pipe 11, and the third bend-type hot water exchange pipe 12. When hot water circulates into the first bend-type hot water exchange pipe 6, the second bend-type hot water exchange pipe 11, and the third bend-type hot water exchange pipe 12, it can not only quickly heat the filter plates 19 to achieve efficient purification, but also use the periodic changes in fluid velocity and pressure to generate pulse fluid that drives the first bend-type hot water exchange pipe 6, the second bend-type hot water exchange pipe 11, and the third bend-type hot water exchange pipe 12 to vibrate to a certain extent. When they vibrate irregularly, they can also help the impurities filtered in the filter plates 19 to fall off, thereby improving the purification efficiency.
[0032] It should also be noted that one-way valves should be installed in both the inlet pipe 7 and the return channel 18 to allow gas to enter the first purification box 2 in one direction and prevent gas backflow.
[0033] In actual use, the bottoms of the second purification box 1 and the first purification box 2 are both supported by the support frame 4. A conveyor belt is also provided below the second purification box 1. The two ends of the conveyor belt are respectively below the first electromagnetic door 14 and the valve port 17, which can be used to catch the cleaned impurities and transfer the impurities to the collection box for easy cleaning.
[0034] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.
Claims
1. A low-carbon coupled purification system for fugitive volatile organic compounds, characterized in that, include: The second purification box and the first purification box are connected. The upper end of the first purification box is provided with a bent pipe that communicates with the upper interior of the second purification box. The interior of the first purification box is provided with a first zigzag hot water exchange pipe. The interior of the second purification box is provided with a first chamber, a second chamber and a third chamber in sequence from the side closer to the first purification box to the side farther away from the first purification box. The upper end of the first chamber is connected with the bent pipe, the lower end of the first chamber is connected with the lower end of the second chamber, and the upper end of the second chamber is connected with the lower end of the third chamber. The second zigzag hot water exchange pipe and the third zigzag hot water exchange pipe are respectively provided inside the first chamber and the second chamber. Multiple first, second, and third bend hot water exchange pipes are provided, and the multiple first, second, and third bend hot water exchange pipes are distributed at equal distances along the height direction of the first and second purification boxes; The bottom of the first, second, and third bend hot water pipes is fitted with filter plates. The first, second, and third bend hot water pipes are all horizontally distributed and have a back-and-forth bending pipe structure. Multiple filter plates are provided, and each filter plate is snapped into the bend gap of the first, second, and third bend hot water pipes.
2. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 1, characterized in that: The filter plate includes a filter element, the filter element has a filter cavity inside, and filter holes are provided on both the upper and lower surfaces of the filter element. The filter holes are connected to the interior of the filter cavity, and the filter cavity is filled with filter particles. The filter particles corresponding to the first bend in the hot water pipe are activated carbon particles; The filter particles corresponding to the second bend in the hot water exchange pipe are supported by a ceramic or metal carrier, coated with a precious metal catalyst, and a layer of nanomaterial is coated on the surface of the precious metal catalyst. A fine particle filter cartridge is used for the filter particles corresponding to the location of the third bend in the hot water pipe.
3. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 1, characterized in that: A sensing unit is installed on the upper inner wall of the second chamber. The sensing unit uses an integrated catalytic combustion gas sensor, a laser dust sensor, and a fixed VOCs gas detector. The catalytic combustion gas sensor detects gas concentration by detecting changes in resistance. The laser dust sensor monitors the dust concentration in the exhaust gas in real time based on the principle of laser scattering. The fixed VOCs gas detector is used to monitor the VOCs concentration in exhaust gas in real time.
4. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 3, characterized in that: The second purification chamber has a first electromagnetic door on one side of its bottom and an inclined channel on the other side of its bottom. The inclined channel has a second electromagnetic door at its tail end and a return channel connected to the tail end of the inclined channel. The return channel is connected to the lower end of the first purification chamber. The first and second electromagnetic doors are located below the third chamber.
5. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 4, characterized in that: Both the first and second electromagnetic gates are electromagnetic gates, and the first and second electromagnetic gates are connected to the sensing unit via a microcontroller of model STMFCT.
6. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 1, characterized in that: The bottom of the second purification box is equipped with a valve port, and the bottom of the second purification box has a funnel-shaped structure.
7. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 1, characterized in that: The upper end of the second purification box is provided with a hot water supply mechanism, which is connected to the first, second and third bend hot water exchange pipes. The hot water supply mechanism is used to supply circulating hot water to the first, second and third bend hot water exchange pipes. The hot water supply system includes a hot water tank, a solar heating or electric heating device, and a circulating water pump.
8. The low-carbon coupled purification system for fugitive volatile organic compounds according to claim 1, characterized in that: The lower side of the first purification box has an inlet pipe for the waste gas to enter. One-way valves should be installed in both the inlet pipe and the return channel to allow the gas to enter the first purification box in one direction.