Condensing air duct for recovering volatile oil and gas

Abstract

The application relates to the technical field of oven gas treatment, in particular to a condensing air duct for recovering volatile oil gas, which comprises a condensing cavity, a condensing pipeline is arranged in the condensing cavity, the condensing cavity is provided with an air outlet and an air inlet, the air outlet and the air inlet are arranged on the two sides of the condensing pipeline respectively, the air outlet and the air inlet are respectively connected with an air outlet pipe and an air inlet pipe, the bottom side of the condensing cavity is funnel-shaped and is provided with an anti-convection section, the anti-convection section is tubular, and the anti-convection section is movably provided with a collecting piece. The funnel-shaped bottom of the condensing cavity guides the airflow direction, the possibility of airflow entering the anti-convection section is reduced, the tubular anti-convection section consumes the kinetic energy of the airflow entering obliquely, the airflow is prevented from reaching the position of the collecting piece, the possibility of the oil gas condensate in the collecting piece being affected by convection and being heated to evaporate and participate in condensation again is reduced, and the condensation recovery efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of oven gas treatment, and in particular to a condenser duct for recovering volatile oil and gas. Background Technology

[0002] In industrial production, factories often use industrial ovens to heat and bake workpieces. In some industries, metal workpieces need to be coated with anti-oxidants before heating and baking to reduce the formation of oxide scale on the workpiece surface. These anti-oxidants volatilize during baking and mix into the oven gas. In other industries, the workpieces themselves are organic materials, and the heating process releases oil and fumes that mix into the oven gas. For economic or environmental reasons, factories need to recover the volatile oil and fumes mixed in the oven gas to avoid direct discharge of these gases, which could lead to resource waste and even environmental pollution.

[0003] In existing oil and gas recovery equipment, the condensation method is often used, which involves installing a condensation pipe in the exhaust channel, with the condensing medium flowing in the condensation pipe. The condensation pipe exchanges heat with the surrounding gas, and after the temperature drops, the oil and gas condenses into droplets for collection.

[0004] However, the collection components of existing oil and gas recovery equipment often participate in the heat convection, causing the condensate collected in the collection components to evaporate upon heating and remix into the oven gas, thus affecting the recovery efficiency. Summary of the Invention

[0005] To minimize the impact of the collecting components on thermal convection, which could cause the condensate to evaporate and mix with the oven gas, thus re-entering the condensation process, and to improve condensation recovery efficiency, this application provides a condensation duct for recovering volatile oil and gas.

[0006] This application provides a condensation duct for recovering volatile oil and gas, employing the following technical solution: A condensing duct for recovering volatile oil and gas includes a condensing chamber, a condensing pipe disposed within the condensing chamber, an outlet and an inlet disposed on opposite sides of the condensing pipe, the outlet and inlet being connected to an outlet pipe and an inlet pipe respectively, the bottom side of the condensing chamber being funnel-shaped and forming an anti-convection section, the anti-convection section being tubular, and a collecting element being movably disposed within the anti-convection section.

[0007] By adopting the above technical solution, the gas discharged from the oven is condensed and collected, and the influence of thermal convection on the collected condensate is reduced. The condensate is then heated, evaporated, and remixed into the oven gas. Specifically, the oven gas is driven by external force to flow from the inlet pipe through the inlet port into the condensing chamber. A pulse line of oven gas flow is formed between the inlet and outlet. This pulse line can be understood as the main flow trajectory of the oven gas in the condensing chamber. This pulse line passes through the condensing pipe, which contains water or other heat exchange medium. The condensing pipe exchanges heat with the surrounding gas. After the temperature decreases, the oil and gas condense into droplets on the surface of the condensing pipe. As the droplets continue to condense, the gravity they experience increases, and finally, under the action of gravity, they drip down to the funnel opening at the bottom of the condensing chamber and slide down the pipe wall of the anti-convection section to the collection device. The funnel-shaped design narrows the inlet of the airflow into the anti-convection section, allowing most of the incoming airflow to bounce off the wall, reducing the possibility of gas entering the anti-convection section. In addition, when the collector is a closed container, the air inside the collector cannot flow out, creating air resistance in the anti-convection section and preventing airflow from flowing into the anti-convection pipe section. This reduces the impact of thermal convection on the condensate. The closed collector keeps the oil and gas in a saturated state, thus preventing the condensate from evaporating due to heat and improving the oil and gas recovery efficiency.

[0008] Preferably, the condensation chamber is provided with a reflux port, the air inlet pipe includes a reflux unit, the reflux unit is provided with a main channel, a self-priming chamber is provided on the outer side of the main channel, the self-priming chamber is provided with an inner hole on the inner side and the inner hole is connected to the main channel, the inner hole is inclined with respect to the airflow direction of the main channel, and an outer hole is provided on the outer side of the self-priming chamber and the outer hole is connected to the reflux port.

[0009] By adopting the above technical solutions, the utilization rate of the condenser pipe and the processing rate of oil and gas are improved. Specifically, the oven gas is a viscous fluid, and its flow in the main channel of the reflux unit is a steady flow, which meets the preconditions of Bernoulli's principle. Therefore, when the oven gas flows in the main channel, the pressure in the main channel decreases, forming a low-pressure zone. The self-priming chamber is a high-pressure zone relative to the main channel. The pressure difference drives the gas in the self-priming chamber to flow into the main channel. Air is replenished into the self-priming chamber through the reflux port, thus forming an airflow circulation loop of "self-priming chamber - main channel - condenser chamber - reflux port - self-priming chamber". A flow artery is formed between the main channel and the reflux port, increasing the complexity of gas flow in the condenser chamber and reducing the formation of static pressure zones in the condenser chamber. This increases the effective throughput of oven gas through the condenser pipe and reduces the amount of oil and gas escaping. In addition, the gas returning from the condenser chamber to the main channel mixes with the oven gas, achieving pre-cooling of the oven gas and enabling it to drop to the dew point more quickly. The inner hole is inclined to the direction of airflow, and the direction of airflow is opposite to the direction of the inner hole. This can reduce the backflow caused by the Coanda effect in the oven airflow entering the reflux cavity through the inner hole.

[0010] Preferably, the reflux port is located on both sides of the condenser pipe and / or between the condenser pipe and the air inlet.

[0011] By adopting the above technical solutions, the full utilization of the condenser pipes is further ensured. Specifically, when the width of the area where the condenser pipe is located is greater than the size of the air outlet, the airflow pulsation formed between the air inlet and the air outlet creates a portion of the condenser pipe area, resulting in a static pressure zone where the condenser pipe cannot be fully utilized. When the return port is located on both sides of the condenser pipe or between the condenser pipe and the air inlet, the pulsation formed between the return port and the air inlet passes through this static pressure zone, enhancing the airflow in this area. The condenser pipe at this location then re-engages in the cooling and heat exchange process, improving the overall heat exchange efficiency of the condenser pipe.

[0012] Preferably, the condensing cavity is provided with a baffle plate and an overflow plate. The baffle plate is inclined and faces the air outlet. A drip channel is formed between the baffle plate and the cavity wall of the condensing cavity. The overflow plate is located below the drip channel and connected to the cavity wall of the condensing cavity. The overflow plate is arranged parallel to the baffle plate and is provided with an overflow hole. A flow guiding channel is formed between the baffle plate and the overflow plate.

[0013] By adopting the above technical solution, the flow range of oven gas in the condensing chamber is limited as much as possible, and a static pressure zone is isolated in the area near the bottom of the condensing chamber, reducing the impact of airflow on the collection component below, and further preventing the condensate in the collection component from evaporating again due to heat. Specifically, when the oven gas flows downward, the baffle plate intercepts and prevents it from flowing downward, and guides it towards the outlet. Since the baffle plate intercepts not only the downward-flowing airflow but also the downward-dripping condensate, a dripping channel is maintained between the baffle plate and the condensing chamber for the condensate to pass through. The condensate drips onto the overflow plate and overflows through the overflow hole. The airflow flowing downward from the dripping channel is guided by the guide channel towards the outlet, and meets the downward airflow that has not been intercepted by the baffle plate, reducing the kinetic energy of the downward airflow and achieving isolation of the static pressure zone.

[0014] Preferably, the reflux unit is inclined and has a liquid collection tank below it. The liquid collection tank is connected to the self-priming cavity. An elastic element and a scraper are provided in the self-priming cavity. The elastic element is arranged along the axial direction of the reflux unit. The scraper is located at one end of the elastic element near the air inlet side of the reflux unit. The reflux unit is provided with a sliding groove. The sliding groove is connected to the self-priming cavity and a pusher is slidably arranged therein. The pusher is connected to the scraper.

[0015] By adopting the above technical solution, the self-priming chamber achieves self-cleaning and collects the oil and gas condensate that is cooled and condensed during the return flow of the oven gas. Specifically, although the inclined setting of the return unit can use gravity to guide the condensate to a lower position and flow into the collection tank, some condensate will still adhere to the surface of the self-priming chamber. Over time, the condensate will form a gel-like substance, which can easily cause blockage of the inner hole. The airflow pushes the pusher to slide, and the pusher drives the scraper to slide in the self-priming chamber. The scraper removes the condensate adhering to the chamber wall, and the scraper causes the elastic element to undergo elastic deformation, storing elastic potential energy. When the air intake in the return unit stops, the elastic element releases the elastic potential energy to push the scraper, and the scraper slides again in the self-priming chamber to scrape off the condensate, achieving the effect of two cleanings with one ventilation.

[0016] Preferably, the slide is provided with at least one set of airtight curtains, each set of airtight curtains includes two airtight sheets, each airtight sheet has a connecting part and an abutting part, the airtight sheets are arranged along the opening direction of the slide and are connected to the slide through the connecting part, the abutting parts of the airtight sheets in the same set abut against each other, and the pusher slides between the airtight sheets.

[0017] By adopting the above technical solutions, the airtightness of the self-priming chamber is improved. Specifically, the opening of the slide groove causes airflow to reverse, with oven gas flowing along the groove wall into the self-priming chamber, reducing the intensity of the self-priming phenomenon and even stopping it. Airtight plates abut against and isolate the slide groove, preventing oven gas from entering the self-priming chamber from the main channel, reducing the impact of the slide groove on the self-priming phenomenon. Tensile channels are formed between the airtight plates for the sliding of the pusher plates, ensuring the original function.

[0018] Preferably, the exhaust pipe is connected to a straight discharge pipe section and a compression pipe section, the straight discharge pipe section and the compression pipe section are respectively provided with a first valve and a second valve, the compression pipe section is connected to a compressor unit, and the compressor unit is connected to the intake pipe.

[0019] By adopting the above technical solution, the oven gas passing through the area where the condenser pipe is located is collected, and the lean oil vapors within it are further collected. Specifically, when the oven gas flows through the area where the condenser pipe is located at a relatively fast speed, some oil vapors may escape without cooling to the dew point. By closing the first valve and opening the second valve, the oven gas is guided to the compressor unit. The compressor unit compresses the gas, causing the oil vapors to quickly reach a saturated state, precipitate, and condense into oil droplets. The gas stored in the compressor unit can be used to return to the intake pipe. After the compressed gas is discharged, its volume expands and absorbs heat, reducing the temperature of the oven gas and enabling it to cool down to the dew point and condense more quickly.

[0020] Preferably, the outer side of the condensation pipe is provided with fins, the fins are arranged in layers, and the fins in adjacent layers are staggered.

[0021] By adopting the above technical solutions, the heat exchange capacity of the condenser pipe is enhanced. Specifically, the fins increase the heat exchange area of ​​the condenser pipe, and the staggered arrangement of the fins divides the airflow into two streams when it passes through the fins, enhancing the diffusion of the airflow and making more fins available for effective use. In addition, the two streams of airflow from the adjacent fin channels in the upper layer converge in the lower layer of fins and generate turbulence, avoiding the situation where laminar flow weakens the effective heat exchange. Turbulence can also cause kinetic energy loss of the airflow, reduce the airflow velocity, and prolong the residence time of the airflow in the fin area.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The funnel-shaped bottom of the condensation chamber guides the airflow direction, reducing the possibility of airflow entering the anti-convection section. The tubular design of the anti-convection section consumes the kinetic energy of the obliquely entering airflow, preventing the airflow from reaching the collection point. This reduces the possibility of the oil and gas condensate in the collection point being subjected to convection, heated and evaporated, and re-participating in condensation. 2. By establishing a return gas path, some gas flows back through the condensation pipe and undergoes multiple condensations, thereby improving the oil and gas recovery rate of the condensation duct. 3. By installing scrapers and pushers in the reflux unit, the pushers are driven by wind power, and the scrapers move to clean the condensed oil and gas condensate in the reflux cavity, preventing the condensate from forming gels and clogging the inner hole. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the internal structure of the condensation cavity in an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the internal structure of the reflow unit in an embodiment of this application.

[0026] Figure 4 This is a simplified schematic diagram of the structure of the airtight sheet in the embodiment of this application.

[0027] Figure 5 This is a schematic diagram of the internal structure of the condensation cavity from a side view of an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Condensing chamber; 2. Condensing pipe; 3. Outlet; 4. Inlet; 5. Outlet pipe; 6. Inlet pipe; 7. Fan; 8. Third valve; 9. Anti-convection section; 10. Collection cylinder; 11. Return unit; 12. Main channel; 13. Self-priming chamber; 14. Return port; 15. Return pipe; 16. Liquid collection tank; 17. Spring; 18. Scraper; 19. Slide groove; 20. Airtight plate; 21. Connecting part; 22. Abutting part; 23. Push plate; 24. Fin; 25. Baffle plate; 26. Overflow plate; 27. Drip channel; 28. Guide channel; 29. ​​Straight discharge pipe section; 30. Compression pipe section; 31. First valve; 32. Second valve; 33. Compressor unit. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0030] Example: See Figures 1-3A condensing duct for recovering volatile oil and gas includes: a condensing chamber 1, through which a condensing pipe 2 for passing a condensing medium is inserted, the condensing pipe 2 having an interface on the upper outer side of the condensing chamber 1; the top of the condensing chamber 1 is shaped like an inverted funnel and has an outlet 3 located above the condensing pipe 2; an inlet 4 is located on the side wall of the condensing chamber 1 below the condensing pipe 2; the outlet 3 and the inlet 4 are respectively connected to an outlet pipe 5 and an inlet pipe 6; a fan 7 is installed at the end of the outlet pipe 5 away from the condensing chamber 1; the end of the inlet pipe 6 away from the condensing chamber 1 extends into an oven, and a third valve 8 is installed inside the inlet pipe 6; the bottom of the condensing chamber 1 is shaped like a funnel and has an anti-convection section 9, the anti-convection section 9 being tubular, and a collection cylinder 10, serving as a collection element, is movably installed at the end of the anti-convection section 9 away from the condensing chamber 1.

[0031] The refrigeration equipment is connected to the condenser pipe 2 via an interface. The condensing medium, such as water or brine, circulates in the condenser pipe 2, waiting for heat exchange. Then, the third valve 8 is opened and the fan 7 is started. The oven gas enters the condenser duct under the suction of the fan 7. The pulse of the oven gas in the condenser chamber 1 is roughly "L" shaped and passes through the area where the condenser pipe 2 is located. The condenser pipe 2 exchanges heat with the oven gas. The oil and gas in the oven gas cool down to the dew point and condense into droplets on the surface of the condenser pipe 2. As the droplets continue to condense, the gravity they experience increases. Finally, under the action of gravity, they drip down to the funnel opening at the bottom of the condenser chamber 1 and slide down the pipe wall of the anti-convection section 9 to the collection device, completing the recovery of oil and gas.

[0032] Both the air inlet 4 and the air outlet 3 are located above the anti-convection section 9, causing the oven gas to mainly flow in the upper part of the condensation chamber 1. The funnel-shaped design narrows the airflow into the inlet of the anti-convection section 9, allowing most of the opposing airflow to bounce off the wall, reducing the possibility of gas entering the anti-convection section 9. In addition, the tubular design of the anti-convection section 9 extends the path of the airflow into the collection cylinder 10. The collection cylinder 10 is a closed container with only one air inlet and outlet. When the gas enters, it creates air resistance in the anti-convection section 9, preventing the airflow from flowing into the anti-convection pipe section, thereby reducing the impact of thermal convection on the condensate. The closed collection device keeps the oil and gas in a saturated state, thus preventing the condensate from evaporating due to heat and improving the oil and gas recovery efficiency.

[0033] See Figures 1-3The intake pipe 6 includes a conventional pipe section and a reflux unit 11. The conventional pipe section is the end of the intake pipe 6 that connects to the oven and the condenser chamber 1. The reflux unit 11 is installed between the conventional pipe sections. The reflux unit 11 forms a main channel 12 and a self-priming chamber 13. The main channel 12 is connected to the conventional pipe section. The self-priming chamber 13 is formed outside the main channel 12. The self-priming chamber 13 has an inner hole and an outer hole. The inner hole is connected to the main channel 12. The inner hole is inclined about the airflow direction of the main channel 12. The condenser chamber 1 has a reflux port 14. The reflux port 14 is located on both sides at the same height as the condenser pipe 2. The reflux port 14 is connected to a reflux pipe 15. The reflux pipe 15 is connected to the outer hole. The oven gas is a viscous fluid. Its flow within the main channel 12 of the reflux unit 11 is a steady flow, which meets the prerequisites of Bernoulli's principle. Therefore, as the oven gas flows within the main channel 12, the pressure within the main channel 12 decreases, forming a low-pressure zone. The self-priming chamber 13 is a high-pressure zone relative to the main channel 12. The pressure difference drives the gas in the self-priming chamber 13 to flow into the main channel 12. Air is replenished into the self-priming chamber 13 through the reflux port 14, thus forming an airflow circulation loop of "self-priming chamber 13 - main channel 12 - condensing chamber 1 - reflux port 14 - self-priming chamber 13". A flow artery is formed between the main channel 12 and the reflux port 14, increasing the complexity of the gas flow within the condensing chamber 1 and reducing the formation of a static pressure zone within the condensing chamber 1. This increases the effective throughput of the oven gas through the condensing pipe 2 and reduces the amount of oil and gas escaping. Furthermore, the gas returning from the condenser chamber 1 to the main channel 12 mixes with the oven gas, achieving pre-cooling of the oven gas and enabling it to drop to the dew point more quickly. The inner hole is inclined to the direction of airflow, with the airflow direction at an angle opposite to the inner hole direction. This reduces the risk of backflow caused by the Coanda effect, where airflow enters the return chamber through the inner hole. The location of the return port 14 further ensures full utilization of the condenser pipe 2. Specifically, when the width of the area containing the condenser pipe 2 is greater than the size of the outlet 3, the airflow pulsation formed between the inlet 4 and the outlet 3 condenses part of the area containing the condenser pipe 2. This area contains a static pressure zone, preventing the condenser pipe 2 from being fully utilized. When the return port 14 is located on both sides of the condenser pipe 2 or between the condenser pipe 2 and the inlet 4, the pulsation formed between the return port 14 and the inlet passes through this static pressure zone, enhancing the flow in this area. The condenser pipe 2 at this location then re-engages in the cooling and heat exchange process, improving the overall heat exchange efficiency of the condenser pipe 2.

[0034] See Figures 3-4The return pipe 15 and the return unit 11 are both inclined. A liquid collection tank 16 is movably installed below the return unit 11. The liquid collection tank 16 is connected to the lower part of the self-priming cavity 13. A spring 17 is installed inside the self-priming cavity 13 as an elastic element. The elastic element is arranged along the axial direction of the return unit 11. A scraper 18 is connected to the end of the elastic element facing the air intake direction of the return unit 11. The scraper 18 is arranged in a ring shape. The return unit 11 has a slide groove 19. The slide groove 19 connects the self-priming cavity 13 and the main channel 12. The slide groove 19 is provided with a set of airtight curtains. The airtight curtains include two airtight plates 20. The airtight plates 20 are arranged opposite each other. The airtight plates 20 form a connecting part 21 and an abutting part 22. The connecting part 21 is connected to the groove wall of the slide groove 19. The abutting part 22 of the airtight plates 20 abuts and fits together. The scraper 18 is connected to a pusher 23. The pusher 23 slides between the airtight plates 20 and extends into the main channel 12. During the reflux process of the oven gas, some of the oil and gas will cool down to the dew point and condense into condensate in the reflux pipe 15 and the self-priming chamber 13. The inclined reflux pipe 15 and reflux unit 11 guide the droplets to the collection tank 16 for collection. However, some condensate will still adhere to the surface of the self-priming chamber 13 and reflux pipe 15. If left for a long time, the condensate will form a gel-like substance, which can easily cause blockage of the inner hole. The airflow pushes the pusher 23 to slide, and the pusher 23 drives the scraper 18 to slide in the self-priming chamber 13. The scraper 18 will remove the condensate adhering to the chamber wall, and the scraper 18 will cause the elastic element to undergo elastic deformation and store elastic potential energy. When the air intake in the reflux unit 11 stops, the elastic element releases the elastic potential energy to push the scraper 18. The scraper 18 will slide again in the self-priming chamber 13 to scrape off the condensate, achieving the effect of two cleanings with one ventilation. Furthermore, the opening of the slide 19 causes reverse airflow, with oven gas flowing along the wall of the slide 19 into the self-priming chamber 13, reducing the intensity of the self-priming phenomenon or even stopping it. The airtight plates 20 abut against and isolate the slide 19, preventing oven gas from entering the self-priming chamber 13 from the main channel 12, thus reducing the impact of the slide 19 on the self-priming phenomenon. Two expandable condensation pipes are formed between the airtight plates 20 for the sliding of the push plate 23, ensuring the original function.

[0035] See Figure 1 , 2In configuration 5, the condenser pipe 2 is arranged in a meandering, layered manner within the condenser cavity 1. Fins 24 are installed on the outer side of the condenser pipe 2, and the fins 24 are arranged in layers along with the condenser pipe 2, with adjacent layers of fins 24 staggered. The fins 24 increase the heat exchange area of ​​the condenser pipe 2, and the staggered arrangement of the layers of fins 24 divides the airflow into two streams as it passes through the fins 24, enhancing the diffusion of the airflow and allowing more fins 24 to be effectively utilized. Furthermore, the two airflows from the adjacent fin channels in the upper layer converge in the lower layer of fins 24, generating turbulence. This avoids the situation where laminar flow weakens effective heat exchange. Turbulence also causes kinetic energy loss in the airflow, reduces the airflow velocity, and prolongs the residence time of the airflow in the fin area.

[0036] See Figure 2 and Figure 5 A baffle plate 25 and an overflow plate 26 are installed inside the condensing chamber 1. The height of both the overflow plate 26 and the baffle plate 25 is lower than that of the air inlet. The baffle plate 25 is inclined and faces the air outlet 3. A drip channel 27 is formed between the baffle plate 25 and the cavity wall of the condensing chamber 1. The overflow plate 26 is located below the drip channel 27 and is connected to the cavity wall of the condensing chamber 1. The overflow plate 26 is installed parallel to the baffle plate 25 and has an overflow hole (not shown in the figure). A guide channel 28 is formed between the baffle plate 25 and the overflow plate 26. When the oven gas flows downward along the wall, the baffle plate 25 intercepts and prevents it from flowing downward, and guides it towards the outlet 3. Since the baffle plate 25 intercepts not only the downward-flowing airflow but also the downward-dripping condensate, a dripping channel is maintained between the baffle plate 25 and the condensation chamber 1 for the condensate to pass through. The condensate drips onto the overflow plate 26 and overflows through the overflow hole. The airflow flowing downward from the dripping channel 27 is guided by the guide channel 28 and flows towards the outlet 3, meeting the downward airflow that is not intercepted by the baffle plate 25, reducing the kinetic energy of the downward airflow, limiting the flow range of the oven gas in the condensation chamber 1 as much as possible, isolating a static pressure zone in the area near the bottom of the condensation chamber 1, reducing the impact of the airflow on the collection device below, and further preventing the condensate in the collection device from evaporating again due to heat.

[0037] See Figures 1-2The fan 7 is connected to a direct discharge pipe section 29 and a compression pipe section 30. The direct discharge pipe section 29 and the compression pipe section 30 are respectively equipped with a first valve 31 and a second valve 32. The compression pipe section 30 is connected to a compressor unit 33, and the output valve of the compressor unit 33 is connected to the inlet pipe 6. When the oven gas flows quickly through the area where the condenser pipe 2 is located, some oil and gas may escape without cooling to the dew point. By closing the first valve 31 and opening the second valve 32, the oven gas is guided to the compressor unit 33. The compressor unit 33 compresses the gas, causing the oil and gas to quickly reach saturation and condense into oil droplets. The thin oil and gas in these droplets are then further collected. The gas stored in the compressor unit 33 can be returned to the inlet pipe 6. After the compressed gas is discharged, its volume expands and absorbs heat, lowering the temperature of the oven gas and allowing it to cool to the dew point and condense more quickly.

[0038] The first valve 31, the second valve 32, and the third valve 8 all adopt the same structure. Taking the first valve 31 as an example, the first valve 31 includes a valve plate, which is installed inside the pipe section and has a rotating shaft installed along its diameter. The rotating shaft extends out of the pipe section and is driven by a motor. The motor drives the rotating shaft to rotate, and the valve plate rotates with the rotating shaft, changing its airflow obstruction area in the pipe.

[0039] The working principle of a condenser duct for recovering volatile oil and gas is as follows: The third valve 8 and the second valve 32 are opened, and the first valve 31 is closed. The fan 7 and compressor unit 33 are started. Under the suction of the fan 7, the oven gas enters the condenser chamber 1 along the inlet pipe 6. As the oven gas flows through the condenser pipe 2, it exchanges heat with the condenser pipe 2 and the fins 24. The temperature of the oil and gas in the oven gas drops to the dew point and condenses into liquid. The condensate falls to the collection cylinder 10 below under gravity. The condenser chamber 1 has a funnel-shaped bottom, an anti-convection section 9, and a baffle plate 25. The overflow plate 26 reduces the impact of convection on the collection cylinder 10 by guiding the airflow and consuming the kinetic energy of the airflow, thus reducing the situation where the condensate is reheated and evaporated to participate in the flow when the heat brought by convection is reduced. In addition, the setting of the return unit 11 allows a part of the gas to return to the inlet pipe 6 for another condensation step, increasing the recovery rate. The oven gas that has completed condensation is guided to the compressor unit 33 for compression and recovery. The compressed gas can be introduced into the inlet pipe 6 and the first valve 31 is opened for direct discharge, or it can be used for pre-cooling in the next recovery process.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A condensation duct for recovering volatile oil and gas, characterized in that, include: A condensing chamber (1) is provided with a condensing pipe (2) inside the condensing chamber (1). The condensing chamber (1) is provided with an air outlet (3) and an air inlet (4). The air outlet (3) and the air inlet (4) are respectively located on both sides of the condensing pipe (2). The air outlet (3) and the air inlet (4) are respectively connected to an air outlet pipe (5) and an air inlet pipe (6). The bottom side of the condensing chamber (1) is funnel-shaped and has an anti-convection section (9). The anti-convection section (9) is tubular and has a collection component movably installed in the anti-convection section (9). The condensing chamber (1) is provided with a return port (14), the air inlet pipe (6) includes a return unit (11), the return unit (11) is provided with a main channel (12), a self-priming chamber (13) is provided on the outside of the main channel (12), the self-priming chamber (13) is provided with an inner hole on the inside and the inner hole is connected to the main channel (12), the inner hole is inclined about the airflow direction of the main channel (12), the self-priming chamber (13) is provided with an outer hole on the outside and the outer hole is connected to the return port (14), the return port (14) is provided on both sides of the condensing pipe (2) and / or between the condensing pipe (2) and the air inlet (4), the return port (14) is connected to a return pipe (15), and the return pipe (15) is connected to the outer hole; The reflux unit (11) is inclined and has a liquid collection tank (16) below it. The liquid collection tank (16) is connected to the self-priming cavity (13). The self-priming cavity (13) is provided with an elastic element and a scraper (18). The elastic element is arranged along the axial direction of the reflux unit (11). The scraper (18) is arranged at one end of the elastic element near the air inlet side of the reflux unit (11). The reflux unit (11) is provided with a sliding groove (19). The sliding groove (19) is connected to the self-priming cavity (13) and a pusher (23) is slidably arranged therein. The pusher (23) is connected to the scraper (18). The scraper (18) is arranged in a ring shape. The liquid collection tank (16) is connected to the lower part of the self-priming cavity (13). The slide (19) is provided with at least one set of airtight curtains. Each set of airtight curtains includes two airtight plates (20). Each airtight plate (20) has a connecting part (21) and an abutting part (22). The airtight plates (20) are arranged along the opening direction of the slide (19) and are connected to the slide (19) through the connecting part (21). The abutting parts (22) of the airtight plates (20) in the same set abut against each other. The pusher (23) slides between the airtight plates (20). The condensation cavity (1) is provided with a baffle plate (25) and an overflow plate (26). The baffle plate (25) is inclined and faces towards The air outlet (3) has a drip channel (27) formed between the baffle plate (25) and the cavity wall of the condensing cavity (1). The overflow plate (26) is located below the drip channel (27) and connected to the cavity wall of the condensing cavity (1). The overflow plate (26) is arranged parallel to the baffle plate (25) and has an overflow hole. A guide channel (28) is formed between the baffle plate (25) and the overflow plate (26). The condensing pipe (2) has fins (24) on its outer side. The fins (24) are arranged in layers, and the fins (24) of adjacent layers are staggered.

2. A condensation duct for recovering volatile oil and gas according to claim 1, characterized in that: The exhaust pipe (5) is connected to a straight pipe section (29) and a compression pipe section (30). The straight pipe section (29) and the compression pipe section (30) are respectively provided with a first valve (31) and a second valve (32). The compression pipe section (30) is connected to a compressor unit (33), and the compressor unit (33) is connected to the intake pipe (6).

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