Distributed condensation system and process

Abstract

The invention belongs to the technical field of waste gas condensation, and particularly relates to a distributed condensation system and process which comprises a gas supply unit, a cooling unit, a heating unit, a backflow unit and a nitrogen supply unit. The gas supply unit is used for providing waste gas; the cooling unit is used for cooling and condensing the waste gas provided by the gas supply unit; the heating unit is used for heating the non-condensable gas discharged by the cooling unit; the reflux unit is used for collecting condensate in the cooling unit; the nitrogen supply unit is used for absorbing cold energy of the heating unit through nitrogen provided by the nitrogen supply unit when the heating unit is used for heating, and is used for absorbing heat of the cooling unit through liquid nitrogen provided by the nitrogen supply unit when the cooling unit is used for cooling; the air supply unit comprises a storage kettle and a breather valve, and the breather valve is arranged at the output end of the storage kettle; through cooperation of the structure, targeted treatment of different components in waste gas is achieved, the treatment risk is reduced, meanwhile, non-condensable gas in the condensation cavity can be directly treated, and the risk of liquid accumulation is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas condensation, and specifically relates to a distributed condensation system and process. Background Art

[0002] Among the emission purification treatment methods for process exhaust gases including storage tank exhaust, chemical reactor exhaust and distillation tower exhaust, liquid nitrogen condensation is a common treatment method. The typical emission characteristics of this type of exhaust gas are: high concentration, small air volume and large fluctuation.

[0003] The conventional liquid nitrogen condensation treatment process adopts a centralized treatment method, which is to aggregate the exhaust gases from various chemical and oil storage tanks, the exhaust gases from each reactor, or the tail gas from the distillation tower, and then use a set of liquid nitrogen condensation equipment for centralized condensation and purification treatment. The condensed VOCs solvent mixture is then treated in the following ways: 1. Outsourcing hazardous waste disposal; 2. Incineration treatment within the factory; 3. Recycling and reuse through distillation, extraction and other process methods.

[0004] The above-mentioned common treatment methods are subject to various constraints, such as high outsourcing disposal costs, management safety risks of waste liquid incineration, or high recycling costs.

[0005] Since the exhaust gas from each emission point needs to be collected and aggregated, there is a risk of backflow and cross-gas at each aggregated emission point such as storage tanks and reactors; at the same time, the VOCs of the emission points also need to consider the issue of chemical safety compatibility, which puts higher management requirements on the production and operation management of chemical storage tanks, and requires reliable chemical safety compatibility analysis and management. If the components of the exhaust gas from storage tanks and reactors change, there will be great safety risks, which puts higher requirements on the management of changes in the types of storage in tanks and the uses of reactors, reducing the flexibility of the configuration management of storage tanks and reactors.

[0006] In addition, the method of collecting and condensing the exhaust gas through pipelines requires the configuration of exhaust gas transmission pipelines. In addition to increasing the cost of pipeline construction and management, the high-concentration VOCs exhaust gas may accumulate liquid or aggregate in the pipeline when it is transported over long distances, which poses certain safety risks.

[0007] To this end, the present invention provides a distributed condensation system and process. Summary of the invention

[0008] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a distributed condensation system described in the present invention comprises an air supply unit, a temperature reduction unit, a temperature increase unit, a reflux unit and a nitrogen supply unit;

[0010] An air supply unit, for providing exhaust gas;

[0011] A cooling unit, used for cooling and condensing the exhaust gas provided by the air supply unit;

[0012] A heating unit, used to heat the non-condensable gas discharged from the cooling unit;

[0013] A reflux unit, used to collect condensate in the cooling unit;

[0014] The nitrogen supply unit absorbs the cold of the heating unit through the nitrogen gas provided by the nitrogen supply unit when the heating unit heats up, and absorbs the heat of the cooling unit through the liquid nitrogen provided by the nitrogen supply unit when the cooling unit cools down.

[0015] Preferably, the gas supply unit comprises a storage kettle and a breathing valve, and the breathing valve is arranged at the output end of the storage kettle;

[0016] The cooling unit includes a cooling heat exchanger and a ninth pipeline, and the cooling heat exchanger is connected to the breathing valve through the ninth pipeline;

[0017] The heating unit includes a heating heat exchanger and a seventh pipeline, and the non-condensable air in the heating heat exchanger is discharged through the seventh pipeline;

[0018] The reflux mechanism includes a first storage tank and a first liquid level gauge, the liquid level in the first storage tank is detected by the first liquid level gauge, and the first storage tank is connected to the condensate discharge end of the cooling heat exchanger through a ninth pipeline;

[0019] The nitrogen supply unit includes a liquid nitrogen storage tank, a vaporizer and a second storage tank. The liquid nitrogen output from the liquid nitrogen storage tank is gasified by the vaporizer and then discharged to the hot end of the heating heat exchanger. The second storage tank is used to store the nitrogen discharged from the heating heat exchanger. The liquid nitrogen and nitrogen in the second storage tank are mixed and then the liquid nitrogen is transported to the cooling heat exchanger.

[0020] Preferably, the cooling heat exchanger comprises a housing, an exhaust gas input pipe, a condensing plate and a refrigeration pipe;

[0021] The exhaust gas inlet pipe is fixedly mounted on one end of the housing and connected to the ninth pipe;

[0022] The condensing plate is fixedly mounted on the inner wall of the accommodating shell, the refrigeration pipe is arranged on the inner wall of the condensing plate, and both ends of the refrigeration pipe extend to the outer wall of the condensing plate.

[0023] Preferably, a filter plate is fixedly mounted on one side of the accommodating shell close to the exhaust gas inlet pipe, a collecting box is fixedly mounted on the outer wall of the accommodating shell, the inner cavity of the collecting box is communicated with the inner cavity of the accommodating shell, and the collecting box is located directly below the filter plate;

[0024] An installation box is fixedly installed on the outer wall of the accommodating shell, and two installation boxes are provided, and the two installation boxes are symmetrically arranged on the outer wall of the accommodating shell;

[0025] The inner wall of the installation box is inclined, and the inclined surfaces inside the two installation boxes are in opposite positions;

[0026] A control motor is fixedly mounted on the outer wall of the installation box, and an output shaft of the control motor extends to the inner wall of the installation box and is fixedly mounted with a control fan blade.

[0027] Preferably, a transmission rod is slidably mounted on the outer wall of the accommodating shell, one end of the transmission rod extends to the inner wall of the accommodating shell and is fixedly mounted with a cleaning scraper, and the outer wall of the cleaning scraper is slidably fitted with the outer wall of the condensing plate;

[0028] The side wall of the cleaning blade is arranged at an inclination.

[0029] Preferably, a control cylinder is provided on one side of the accommodating shell, a control plug is slidably mounted on the inner wall of the control cylinder, a control shaft is fixedly mounted on one side of the control plug, and one end of the control shaft away from the control plug is elastically connected to the outer wall of the transmission rod;

[0030] The outer wall of the control cylinder is provided with a delivery pipe, which is distributed on the outer wall of the control cylinder in a spiral shape, and one end of the delivery pipe is connected to the input end of the refrigeration pipe.

[0031] Preferably, a mounting plate is fixedly mounted on the outer wall of the accommodating shell, and a limiting inclined block is fixedly mounted on the outer wall of the mounting plate;

[0032] The outer wall of the transmission rod is elastically mounted with a locking plate for engaging with the limiting inclined block through a torsion spring;

[0033] A pressing inclined block is fixedly installed at the axial end of the control shaft, the bottom surface of the pressing inclined block is slidably fitted with the outer wall of the transmission rod, and is used to press the end of the locking plate away from the limiting inclined block.

[0034] Preferably, a transmission sleeve is rotatably mounted on the inner wall of the accommodating shell, the transmission sleeve penetrates the filter plate, and a cleaning sheet is fixedly mounted thereon, and the outer wall of the cleaning sheet is in contact with a side of the filter plate close to the exhaust gas inlet pipe.

[0035] Preferably, a receiving cylinder is fixedly mounted on the inner wall of the receiving shell, a transmission plug is slidably mounted on the inner wall of the receiving cylinder, and a transmission shaft is rotatably mounted on one side of the transmission plug;

[0036] A transmission frame is fixedly mounted on the inner wall of the accommodating cylinder, and a transmission shaft passes through the transmission frame;

[0037] The radial outer wall of the transmission shaft is provided with an annular groove, which is arranged obliquely, and the transmission frame is provided with a spherical protrusion which is slidably matched with the annular groove;

[0038] A plug-in rod which is slidably plugged with the transmission sleeve is fixedly installed on one end of the transmission shaft away from the transmission plug.

[0039] A distributed condensation process, which uses the above-mentioned distributed condensation system, comprises the following steps:

[0040] A1. Input exhaust gas;

[0041] A2. Condensate the exhaust gas and discharge the condensate;

[0042] A3, no condensation of gas at elevated temperature;

[0043] A4. Recover nitrogen and deliver it for refrigeration.

[0044] The beneficial effects of the present invention are as follows:

[0045] 1. The present invention cools and condenses the waste gas provided by the gas supply unit by setting a cooling unit, and heats the non-condensable gas discharged by the cooling unit by the heating unit. When the heating unit heats up, the nitrogen provided by the nitrogen supply unit absorbs the cold of the heating unit. When the cooling unit cools down, the liquid nitrogen provided by the nitrogen supply unit absorbs the heat of the cooling unit. The first storage tank is connected to the condensate discharge end of the cooling heat exchanger through the ninth pipeline. The non-condensable gas is heated in the heating heat exchanger to recover the cold it carries, and then discharged to the atmosphere through the seventh pipeline. This achieves targeted treatment of different components in the waste gas and reduces treatment risks. At the same time, the non-condensable gas in the condensation chamber can be directly treated to prevent the risk of liquid accumulation.

[0046] 2. The present invention uses point-to-point condensation treatment, and there is no possibility of mixed pollution of the condensate. The condensate can be directly recycled and utilized. In addition to the cost of outsourcing the disposal of waste liquid, it can also generate economic benefits of recycling. At the same time, for the treatment of the tail gas of the storage tank, a centralized treatment condensation system is adopted. Since the tail gas of multiple storage tanks is merged, the uncertainty of the discharge of the tail gas of the storage tank leads to the need to design the liquid nitrogen condensation system as one-in-one standby, a point-to-point distributed processing mode, so that the condensation system can use fixed intermittent exhaust for defrosting without the need for a standby system, thereby reducing system investment;

[0047] 3. In the present invention, the distributed design of liquid nitrogen adopts the method of atmospheric evaporation, and the evaporation temperature is lower than that of pressurized evaporation. This feature provides a larger temperature difference of the heat exchanger for the system heat exchange, reducing the cost of the heat exchanger. On the other hand, the lower condensation temperature can provide a lower saturated steam concentration of the VOCs tail gas, which is more conducive to meeting the emission standards. For example, butadiene, tetrafluoroethylene, methyl chloride, and most refrigerants can be directly discharged without a step of deep treatment. Due to the point-to-point treatment method, the tail gas pipeline does not need to be aggregated, and the production equipment such as storage tanks and reactors do not need to consider the safety compatibility of chemicals when replacing and adjusting products, which is convenient for enterprises to manage and operate;

[0048] 4. The present invention sets a transmission rod and a cleaning scraper. After the condensation is completed, the cleaning scraper is slid to scrape the liquid on the outer wall of the condensation plate. On the one hand, it can facilitate the recovery of the condensate, and on the other hand, it can prevent the condensate from adhering to the outer wall of the condensation plate to form a mucous film after drying, thereby affecting the subsequent cold chain operation. At the same time, a control cylinder and a control plug are set. The sliding of the control plug is adjusted by the temperature difference in the pipeline before and after condensation, and the transmission rod is driven to slide by the control shaft, thereby achieving the scraping of the outer wall of the condensation plate, realizing the recycling of waste resources, and further improving the energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] Figure 1 It is a component distribution diagram when the storage kettle in the present invention is a chemical storage tank;

[0051] Figure 2 This is a component distribution diagram when the storage kettle in the present invention is a tail gas reactor;

[0052] Figure 3 It is a component distribution diagram when the condensate needs to be recovered independently in the present invention;

[0053] Figure 4 It is a schematic diagram of the overall structure of the cooling condenser in the present invention;

[0054] Figure 5 It is a schematic diagram of the installation of the condensation plate in the present invention;

[0055] Figure 6 It is a schematic diagram of the internal structure of the installation box in the present invention;

[0056] Figure 7 It is a structural schematic diagram of the refrigeration pipe in the present invention;

[0057] Figure 8 It is a schematic diagram of the structure of the cleaning scraper in the present invention;

[0058] Fig. 9 yes Figure 8 A partial enlarged view of the middle part;

[0059] Fig.10 It is a schematic diagram of the installation of the accommodating cylinder in the present invention;

[0060] Fig.11 It is a structural schematic diagram of the transmission shaft in the present invention;

[0061] Fig.12 It is a flow chart of the distributed condensation process in the present invention.

[0062] In the figure: 1. Cooling heat exchanger; 001. accommodating shell; 002. collecting box; 003. exhaust gas inlet pipe; 004. installation box; 005. control motor; 006. refrigeration pipe; 007. control cylinder; 008. delivery pipe; 009. installation plate; 010. condensing plate; 011. cleaning scraper; 012. control fan blade; 013. accommodating cylinder; 014. transmission sleeve; 015. filter plate; 016. control plug; 017. control shaft; 018. transmission rod; 019. top pressure inclined block; 020. locking plate; 021. limit inclined block; 022. cleaning sheet; 023. plug rod; 024. annular groove; 025. transmission plug; 026. transmission shaft; 027. transmission frame;

[0063] 2. Heating heat exchanger; 21. Second liquid level; 22. First liquid level meter; 23. Flow meter; 24. Second temperature sensor; 25. First temperature sensor; 3. Second storage tank; 303. Third pipeline; 304. Fourth pipeline; 305. Fifth pipeline; 306. Sixth pipeline; 307. Ninth pipeline; 308. Second pipeline; 309. Seventh pipeline; 310. First pipeline; 312. Eighth pipeline; 4. Vaporizer; 5. Liquid nitrogen storage tank; 6. First storage tank; 7. Control pump; 8. Storage kettle; 11. Second valve; 12. Third valve; 13. First valve; 14. Breathing valve. DETAILED DESCRIPTION

[0064] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0065] like Figure 1 As shown, a distributed condensation system according to an embodiment of the present invention includes an air supply unit, a temperature reduction unit, a temperature increase unit, a reflux unit and a nitrogen supply unit;

[0066] The air supply unit is used to provide waste gas. The air supply unit includes a storage kettle 8 and a breathing valve 14 . The breathing valve 14 is arranged at the output end of the storage kettle 8 .

[0067] A cooling unit, used for cooling and condensing the exhaust gas provided by the air supply unit, the cooling unit comprises a cooling heat exchanger 1 and a ninth pipeline 307, and the cooling heat exchanger 1 is connected to the breathing valve 14 through the ninth pipeline 307;

[0068] The heating unit is used to heat the non-condensable gas discharged from the cooling unit. The heating unit includes a heating heat exchanger 2 and a seventh pipeline 309 . The non-condensable gas in the heating heat exchanger 2 is then discharged through the seventh pipeline 309 .

[0069] The reflux unit is used to collect the condensate in the cooling unit. The reflux mechanism includes a first storage tank 6 and a first liquid level gauge 22. The liquid level in the inner cavity of the first storage tank 6 is detected by the first liquid level gauge 22. The first storage tank 6 is connected to the condensate discharge end of the cooling heat exchanger 1 through the ninth pipeline 307.

[0070] The nitrogen supply unit absorbs the cold of the heating unit through the nitrogen provided by the nitrogen supply unit when the heating unit heats up, and absorbs the heat of the cooling unit through the liquid nitrogen provided by the nitrogen supply unit when the cooling unit cools down. The nitrogen supply unit includes a liquid nitrogen storage tank 5, a vaporizer 4 and a second storage tank 3. The liquid nitrogen output from the liquid nitrogen storage tank 5 is gasified by the vaporizer 4 and then discharged to the hot end of the heating heat exchanger 2. The second storage tank 3 is used to store the nitrogen discharged from the heating heat exchanger 2, and the liquid nitrogen and nitrogen in the second storage tank 3 are mixed and then the liquid nitrogen is transported to the cooling heat exchanger 1.

[0071] When the storage kettle 8 is a chemical storage tank, the exhaust gas discharged from the breathing valve 14 of the storage kettle 8, the VOCs exhaust gas enters the cooling heat exchanger 1 to be cooled, and the VOCs components therein are condensed and precipitated, and discharged from the first pipeline 310 to the first storage tank 6. The first storage tank 6 is provided with a first liquid level gauge 22. When the liquid level reaches a certain height, the first valve 13 is opened, and the control pump 7 is started and operated, and the condensate temporarily stored in the storage tank is pumped to the storage kettle 8 for recovery.

[0072] The VOCs solvent discharged with the gas is 100% recycled, and there is no waste liquid discharged from the system. The cooled low-temperature non-condensable gas is transported to the heating heat exchanger 2 through the second pipeline 308. The first temperature sensor 25 is set on the second pipeline 308. The non-condensable gas is heated in the heating heat exchanger 2 to recover the cold it carries, and then discharged into the atmosphere through the seventh pipeline 309.

[0073] The liquid nitrogen provided by the liquid nitrogen storage tank 5 is vaporized into nitrogen in the vaporizer 4, and the room temperature nitrogen enters the hot side of the temperature-raising heat exchanger 2 through the third pipeline 303 and the third valve 12 to recover the coldness of the non-condensable steam. Since the nitrogen in the above process comes from the evaporation of liquid nitrogen, a certain amount of liquid nitrogen needs to be consumed (the nitrogen source can also use nitrogen from the nitrogen pipeline network without consuming liquid nitrogen). When the nitrogen in the nitrogen pipeline network comes from pipeline nitrogen or PSA gas production, since the nitrogen produced by liquid nitrogen is more expensive than pipeline nitrogen and PSA nitrogen production, considerable liquid nitrogen consumption and operating costs can be saved.

[0074] The nitrogen that is initially cooled on the hot side of the heating heat exchanger 2 enters the second storage tank 3 through the fourth pipe 304. The nitrogen in the second storage tank 3 is mixed with the liquid nitrogen in the second storage tank 3 for heat exchange and is cooled. At the same time, part of the liquid nitrogen in the storage tank is vaporized into low-temperature nitrogen. The second storage tank 3 is provided with a second liquid level gauge 21, which is used to monitor the liquid level of the liquid nitrogen in the second storage tank 3. When the liquid level of the liquid nitrogen decreases, the second valve 11 is opened to replenish the liquid nitrogen for the second storage tank 3.

[0075] The cooled low-temperature nitrogen in the second storage tank 3 and the vaporized low-temperature nitrogen (through the fifth pipe 305) are discharged from the second storage tank 3 and then enter the cooling heat exchanger 1 to provide a cold source for the condensation of VOCs.

[0076] The low-temperature nitrogen is heated in the cooling heat exchanger 1 and then discharged from the system through the sixth pipeline 306. The second temperature sensor 24 and the flow meter 23 are designed on the sixth pipeline 306. The second temperature sensor 24 is used to limit the opening of the third valve 12 to prevent excessive supply of nitrogen.

[0077] When the second temperature sensor 24 detects that the temperature is too low, typically below 0°C, or below the process gas inlet temperature -40°C, the opening of the third valve 12 is limited to a certain opening. The first temperature sensor 25 is used to monitor the temperature of the condensed tail gas.

[0078] The temperature needs to be adjusted according to different VOCs components to ensure that the corresponding saturated steam concentration is lower than the allowable concentration for compliant emissions. The detection value of the second temperature sensor 24 is compared with the gas control set value. If the detection value is higher than the set value, the third valve 12 adjusts the valve opening according to the PID parameter to reduce the supply of nitrogen. If the detection value is lower than the set value, the control is reversed.

[0079] The nitrogen discharged from the sixth pipeline 306 is directly vented to the outside, or is pressurized by a fan or a compressor and then recycled.

[0080] Since the nitrogen tail gas is discharged at normal pressure, the evaporation of nitrogen in the second storage tank 3 means evaporation at normal pressure, and the low-temperature nitrogen discharged from the second storage tank 3 is at a low temperature of -196°C, which can provide a larger heat exchange temperature difference and a lower condensation temperature for the condensation system compared to conventional pressure evaporation. Correspondingly, the exhaust concentration of VOCs can reach a lower level. This feature can directly condense and meet the emission standards when dealing with VOCs components with very high saturated steam concentrations without further deep treatment. Typical components of this type include butadiene, tetrafluoroethylene, methyl chloride, and refrigerants.

[0081] In addition to the exhaust gas treatment for storage kettles 8 and other external exhaust gases, another very practical typical application scenario is the exhaust gas treatment of chemical reactors.

[0082] like Figure 2 As shown, when the storage kettle 8 is a tail gas reactor, the tail gas of the chemical reactor is condensed and purified by the same system, and the condensate can be directly returned to the reactor according to actual conditions.

[0083] like Figure 3 As shown, when the condensate needs to be recovered independently, the output end of the control pump 7 is directly discharged to the container for temporary storage of the condensate through the eighth pipeline 312.

[0084] In the present invention, since the condensation system is applied in a distributed manner, its processing capacity is usually small, wherein the most typical gas flow rate range is 2 to 50 m3 / h but not limited to 50 m3 / h, so the liquid nitrogen consumption of a single system is also small. According to this situation, the liquid nitrogen storage tank 5 adopts a movable liquid nitrogen storage tank, and the capacity of a single tank is less than 2 tons.

[0085] like Figure 4-11 As shown, as a preferred embodiment of the present invention, the cooling heat exchanger 1 includes a housing 001, an exhaust gas inlet pipe 003, a condensing plate 010 and a refrigeration pipe 006;

[0086] The waste gas inlet pipe 003 is fixedly installed at one end of the housing 001 and connected to the ninth pipeline 307. During the condensation operation, the waste gas enters the inner cavity of the housing 001 through the waste gas inlet pipe 003.

[0087] The condensation plate 010 is fixedly installed on the inner wall of the housing 001, and the refrigeration tube 006 is arranged on the inner wall of the condensation plate 010, and both ends extend to the outer wall of the condensation plate 010, wherein the refrigeration tube 006 and the condensation plate 010 are both made of copper, and the liquid nitrogen is controlled to flow in the inner cavity of the refrigeration tube 006, so as to achieve the cooling of the condensation plate 010, and after the exhaust gas in the housing 001 contacts the outer wall of the low-temperature condensation plate 010, part of it is condensed into liquid.

[0088] In order to facilitate the collection of condensate, a conduit for discharging condensate is provided at the bottom of the housing 001. The conduit is connected to the first storage tank 6 through the first pipe 310 so that the first storage tank 6 can collect condensate.

[0089] During the condensation process, some non-condensable gas still remains in the inner cavity of the housing 001. In order to facilitate the discharge of the non-condensable gas, a non-condensable gas discharge pipe is set on the outer wall of the housing 001. The opening of the discharge pipe needs to be no lower than the liquid level in the inner cavity of the housing 001.

[0090] A filter plate 015 is fixedly installed on one side of the housing 001 close to the exhaust gas inlet pipe 003. When the exhaust gas inlet pipe 003 inputs exhaust gas into the inner cavity of the housing 001, dust particles in the exhaust gas are filtered through the filter plate 015. During the condensation process, particles in the exhaust gas are prevented from adhering to the outer wall of the condensation plate 010 as much as possible. During the condensation process, the contact area between the condensation plate 010 and the exhaust gas is maintained, thereby maintaining the condensation efficiency.

[0091] At the same time, the filter plate 015 faces the exhaust gas input pipe 003 , and during the exhaust gas input process, the filter plate 015 can be heated by the exhaust gas, thereby preventing water droplets from condensing on the outer wall of the filter plate 015 and increasing the service life of the filter plate 015 .

[0092] A collecting box 002 is fixedly installed on the outer wall of the accommodating shell 001. The inner cavity of the collecting box 002 is interconnected with the inner cavity of the accommodating shell 001, and the collecting box 002 is located directly below the filter plate 015. As dust particles adhere, the dust particles fall off from the outer wall of the filter plate 015 and fall into the inner cavity of the collecting box 002. At this time, the dust is collected by the collecting box 002.

[0093] In order to facilitate the cleaning of the dust in the inner cavity of the collection box 002, the collection box 002 is configured to be detachable, and its bottom and top are detachably connected (bolted connection is selected). By removing the bottom of the collection box 002, the dust inside the collection box 002 can be dumped and cleaned.

[0094] An installation box 004 is fixedly installed on the outer wall of the housing 001. Two installation boxes 004 are provided. The two installation boxes 004 are symmetrically arranged on the outer wall of the housing 001, wherein the inner cavity of the installation box 004 is connected to the inner cavity of the housing 001.

[0095] like Figure 6 As shown, the inner wall of the installation box 004 is tilted, the inclined surfaces inside the two installation boxes 004 are in opposite positions, and the control motor 005 is fixedly installed on the outer wall of the installation box 004, wherein the installation positions of the two control motors 005 are opposite and the rotation directions are opposite.

[0096] The output shaft of the control motor 005 extends to the inner wall of the installation box 004 and is fixedly installed with a control blade 012. The control motor 005 drives the control blade 012 to rotate, thereby generating airflow. The two control blades 012 rotate in opposite directions and the inclined surfaces of the two installation boxes 004 guide the flow, thereby generating an internal circulating airflow in the inner cavity of the housing 001, so that the exhaust gas inside the housing 001 can be evenly contacted with the outer wall of the condensation plate 010, thereby keeping the exhaust gas evenly cooled.

[0097] It should be noted that, in order to maintain the sealing of the inner cavity of the accommodating housing 001 as much as possible, a sealed bearing is provided at the contact position between the output shaft of the control motor 005 and the accommodating housing 001 .

[0098] As a preferred embodiment of the present invention, a transmission rod 018 is slidably installed on the outer wall of the accommodating shell 001, one end of the transmission rod 018 extends to the inner wall of the accommodating shell 001 and is fixedly installed with a cleaning scraper 011. The transmission rod 018 is slid outside the accommodating shell 001 to drive the cleaning scraper 011 to slide.

[0099] The outer wall of the cleaning scraper 011 is slidably fitted with the outer wall of the condensation plate 010. After the condensation is completed, the cleaning scraper 011 is slid to scrape off the liquid on the outer wall of the condensation plate 010. This can facilitate the recovery of the condensate and prevent the condensate from adhering to the outer wall of the condensation plate 010 to form a sticky film after drying, thereby affecting subsequent cold chain operations.

[0100] In order to improve the cleaning efficiency of the cleaning scraper 011, the side wall of the cleaning scraper 011 is inclined so that it is convenient to scrape away impurities on the outer wall of the condensation plate 010 when the cleaning scraper 011 slides.

[0101] As a preferred embodiment of the present invention, a control cylinder 007 is provided on one side of the housing 001, and a control plug 016 is slidably installed on the inner wall of the control cylinder 007 to adjust the pressure inside the control cylinder 007, thereby driving the control plug 016 to slide.

[0102] A control shaft 017 is fixedly installed on one side of the control plug 016, and one end of the control shaft 017 away from the control plug 016 is elastically connected to the outer wall of the transmission rod 018. A spring is provided on the outer wall of the control shaft 017, and the control shaft 017 is elastically connected to the transmission rod 018 through the spring. When the control plug 016 slides, the transmission rod 018 is driven to slide through the control shaft 017, thereby achieving scraping of the outer wall of the condensation plate 010.

[0103] The outer wall of the control cylinder 007 is provided with a delivery pipe 008 , which is spirally distributed on the outer wall of the control cylinder 007 , and one end of the delivery pipe 008 is connected to the input end of the refrigeration pipe 006 , and the material of the delivery pipe 008 is the same as that of the refrigeration pipe 006 .

[0104] In this embodiment, the input end of the delivery pipe 008 is connected to the fifth pipeline 305, and low-temperature nitrogen and liquid nitrogen are provided through the second storage tank 3. When the low-temperature nitrogen and liquid nitrogen flow inside the delivery pipe 008, the temperature of the inner cavity of the control cylinder 007 is reduced, thereby causing the volume of the gas in the control cylinder 007 to decrease. At this time, the control plug 016 slides toward the inside of the control cylinder 007, driving the cleaning scraper 011 to slide to fit the outer wall of the accommodating shell 001.

[0105] After the condensation is completed, the inner cavity of the delivery pipe 008 stops delivering nitrogen. At this time, the temperature inside the control cylinder 007 gradually increases, causing the gas inside the control cylinder 007 to gradually expand. At this time, the control plug 016 drives the control shaft 017 and the transmission rod 018 to reset. During this process, the cleaning scraper 011 scrapes off the condensate on the outer wall of the condensation plate 010.

[0106] As a preferred embodiment of the present invention, a mounting plate 009 is fixedly installed on the outer wall of the accommodating shell 001, and a limiting bevel block 021 is fixedly installed on the outer wall of the mounting plate 009, wherein the mounting plate 009 is arranged on one side of the transmission rod 018, and a plurality of limiting bevel blocks 021 are evenly arranged along the outer wall of the mounting plate 009.

[0107] The outer wall of the transmission rod 018 is elastically mounted with a locking plate 020 for engaging with the limiting bevel block 021 through a torsion spring. A bracket is provided on the outer wall of the transmission rod 018. The middle part of the locking plate 020 is connected to the bracket through a torsion spring. One end of the locking plate 020 has a tendency to engage with the limiting bevel block 021.

[0108] Through the cooperation between the locking plate 020 and the limiting bevel block 021, the sliding of the transmission rod 018 can be limited in one direction. During the process of controlling the expansion of the gas in the inner cavity of the cylinder 007, the locking plate 020 is engaged with the outer wall of the limiting bevel block 021 to fix the position of the transmission rod 018.

[0109] A pressing bevel block 019 is fixedly installed at the axial end of the control shaft 017, and the bottom surface of the pressing bevel block 019 is slidably fitted with the outer wall of the transmission rod 018, and is used to press the locking plate 020 away from one end of the limiting bevel block 021. After the transmission rod 018 is fixed, the control shaft 017 continues to slide and compresses the spring between the control shaft 017 and the transmission rod 018 until the control shaft 017 lifts the locking plate 020 through the pressing bevel block 019, causing the locking plate 020 to separate from the limiting bevel block 021. At this time, the spring releases its elastic potential energy to drive the transmission rod 018 to accelerate, and the cleaning scraper 011 is controlled to scrape by acceleration, thereby improving the cleaning efficiency of the condensation plate 010.

[0110] In this embodiment, since the spring performs simple harmonic motion when returning to its original position, the cleaning scraper 011 moves synchronously, scraping back and forth on the outer wall of the condensation plate 010. This characteristic is used to improve the cleaning efficiency.

[0111] As a preferred embodiment of the invention, a transmission sleeve 014 is rotatably mounted on the inner wall of the accommodating housing 001 . The transmission sleeve 014 penetrates the filter plate 015 and is fixedly mounted with a cleaning sheet 022 . The transmission sleeve 014 drives the cleaning sheet 022 to rotate synchronously.

[0112] The outer wall of the cleaning sheet 022 is fitted to the side of the filter plate 015 close to the exhaust gas inlet pipe 003. After condensation is completed, the cleaning sheet 022 is rotated to scrape off the dust on the outer wall of the filter plate 015 to prevent the filter plate 015 from being blocked and facilitate reuse.

[0113] A accommodating cylinder 013 is fixedly installed on the inner wall of the accommodating shell 001, and a transmission plug 025 is slidably installed on the inner wall of the accommodating cylinder 013. A transmission shaft 026 is rotatably installed on one side of the transmission plug 025, wherein the accommodating cylinder 013 is arranged on a side of the accommodating shell 001 close to the exhaust gas inlet pipe 003. When the exhaust gas is introduced, the heat energy in the exhaust gas heats the outer wall of the accommodating cylinder 013, causing the gas inside the accommodating cylinder 013 to expand, and the transmission plug 025 and the transmission shaft 026 are controlled to slide. After condensation is completed, the exhaust gas stops entering, and the interior of the accommodating cylinder 013 gradually returns to room temperature. At this time, the volume of the gas in the inner cavity of the accommodating cylinder 013 is reduced, and the transmission plug 025 and the transmission shaft 026 are controlled to reset.

[0114] A transmission frame 027 is fixedly mounted on the inner wall of the accommodating cylinder 013 , and the transmission shaft 026 passes through the transmission frame 027 . The inner wall of the transmission frame 027 is in contact with the radial outer wall of the transmission shaft 026 , providing support for the transmission shaft 026 .

[0115] The radial outer wall of the transmission shaft 026 is provided with an annular groove 024 which is tilted. A spherical protrusion which slides with the annular groove 024 is provided in the transmission frame 027. When the transmission shaft 026 is slid, the transmission shaft 026 is driven to rotate through the cooperation between the spherical protrusion and the tilted annular groove 024.

[0116] One end of the transmission shaft 026 away from the transmission plug 025 is fixedly installed with a plug rod 023 which is slidably plugged with the transmission sleeve 014. When the transmission shaft 026 rotates, the plug rod 023 (the plug rod 023 is a regular hexagonal prism) drives the transmission sleeve 014 to rotate, thereby controlling the rotation of the cleaning sheet 022 to achieve scraping and cleaning of the filter plate 015.

[0117] like Fig.12 As shown, a distributed condensation process, which adopts the above-mentioned distributed condensation system, includes the following steps:

[0118] A1. Input exhaust gas;

[0119] A2. Condensate the exhaust gas and discharge the condensate;

[0120] A3, no condensation of gas at elevated temperature;

[0121] A4. Recover nitrogen and deliver it for refrigeration.

[0122] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0123] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0124] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A distributed condensation system, characterized in that: It includes a gas supply unit, a temperature reduction unit, a temperature increase unit, a reflux unit and a nitrogen supply unit; An air supply unit, for providing exhaust gas; A cooling unit, used for cooling and condensing the exhaust gas provided by the air supply unit; A heating unit, used to heat the non-condensable gas discharged from the cooling unit; A reflux unit, used to collect condensate in the cooling unit; The nitrogen supply unit absorbs the cold of the heating unit through the nitrogen gas provided by the nitrogen supply unit when the heating unit heats up, and absorbs the heat of the cooling unit through the liquid nitrogen provided by the nitrogen supply unit when the cooling unit cools down.

2. A distributed condensation system according to claim 1, characterized in that: The gas supply unit comprises a storage kettle (8) and a breathing valve (14), wherein the breathing valve (14) is arranged at the output end of the storage kettle (8); The cooling unit comprises a cooling heat exchanger (1) and a ninth pipeline (307), wherein the cooling heat exchanger (1) is connected to the breathing valve (14) via the ninth pipeline (307); The temperature raising unit comprises a temperature raising heat exchanger (2) and a seventh pipeline (309), and the non-condensable temperature in the temperature raising heat exchanger (2) is finally discharged through the seventh pipeline (309); The reflux mechanism comprises a first storage tank (6) and a first liquid level gauge (22), the liquid level in the inner cavity of the first storage tank (6) is detected by the first liquid level gauge (22), and the first storage tank (6) is connected to the condensate discharge end of the cooling heat exchanger (1) via a ninth pipeline (307); The nitrogen supply unit comprises a liquid nitrogen storage tank (5), a vaporizer (4) and a second storage tank (3); the liquid nitrogen output from the liquid nitrogen storage tank (5) is gasified by the vaporizer (4) and then discharged to the hot end of the temperature-raising heat exchanger (2); the second storage tank (3) is used to store nitrogen gas discharged from the temperature-raising heat exchanger (2); and the liquid nitrogen and nitrogen gas in the second storage tank (3) are mixed and then the liquid nitrogen is transported to the temperature-falling heat exchanger (1).

3. A distributed condensation system according to claim 2, characterized in that: The cooling heat exchanger (1) comprises a housing (001), an exhaust gas input pipe (003), a condensation plate (010) and a refrigeration pipe (006); The exhaust gas input pipe (003) is fixedly mounted on one end of the housing (001) and connected to the ninth pipe (307); The condensation plate (010) is fixedly mounted on the inner wall of the accommodating shell (001), and the refrigeration pipe (006) is arranged on the inner wall of the condensation plate (010), with both ends extending to the outer wall of the condensation plate (010).

4. A distributed condensation system according to claim 3, characterized in that: A filter plate (015) is fixedly mounted on one side of the accommodating shell (001) close to the exhaust gas inlet pipe (003), and a collection box (002) is fixedly mounted on the outer wall of the accommodating shell (001). The inner cavity of the collection box (002) is connected to the inner cavity of the accommodating shell (001), and the collection box (002) is located directly below the filter plate (015); An installation box (004) is fixedly installed on the outer wall of the accommodating shell (001), and two installation boxes (004) are provided. The two installation boxes (004) are symmetrically arranged on the outer wall of the accommodating shell (001); The inner wall of the installation box (004) is arranged to be inclined, and the inclined surfaces inside the two installation boxes (004) are located at opposite positions; A control motor (005) is fixedly mounted on the outer wall of the installation box (004); an output shaft of the control motor (005) extends to the inner wall of the installation box (004) and is fixedly mounted with a control fan blade (012).

5. A distributed condensation system and process according to claim 4, characterized in that: A transmission rod (018) is slidably mounted on the outer wall of the accommodating shell (001), one end of the transmission rod (018) extends to the inner wall of the accommodating shell (001) and is fixedly mounted with a cleaning scraper (011), and the outer wall of the cleaning scraper (011) is slidably fitted with the outer wall of the condensation plate (010); The side wall of the cleaning scraper (011) is arranged inclined.

6. A distributed condensation system according to claim 5, characterized in that: A control cylinder (007) is provided on one side of the accommodating shell (001), a control plug (016) is slidably mounted on the inner wall of the control cylinder (007), a control shaft (017) is fixedly mounted on one side of the control plug (016), and one end of the control shaft (017) away from the control plug (016) is elastically connected to the outer wall of the transmission rod (018); The outer wall of the control cylinder (007) is provided with a delivery pipe (008), and the delivery pipe (008) is distributed in a spiral shape on the outer wall of the control cylinder (007), and one end of the delivery pipe (008) is connected to the input end of the refrigeration pipe (006).

7. A distributed condensation system according to claim 6, characterized in that: The outer wall of the accommodating shell (001) is fixedly mounted with a mounting plate (009), and the outer wall of the mounting plate (009) is fixedly mounted with a limiting inclined block (021); The outer wall of the transmission rod (018) is elastically mounted with a locking plate (020) for engaging with a limiting inclined block (021) via a torsion spring; A pressing bevel block (019) is fixedly mounted on the axial end of the control shaft (017), the bottom surface of the pressing bevel block (019) is slidably fitted with the outer wall of the transmission rod (018), and is used to press the end of the locking plate (020) away from the limiting bevel block (021).

8. A distributed condensation system according to claim 7, characterized in that: A transmission sleeve (014) is rotatably mounted on the inner wall of the accommodating shell (001), the transmission sleeve (014) penetrates the filter plate (015) and is fixedly mounted with a cleaning sheet (022), the outer wall of the cleaning sheet (022) being in contact with a side of the filter plate (015) close to the exhaust gas inlet pipe (003).

9. A distributed condensation system according to claim 8, characterized in that: The inner wall of the housing (001) is fixedly mounted with a housing cylinder (013), the inner wall of the housing cylinder (013) is slidably mounted with a transmission plug (025), and one side of the transmission plug (025) is rotatably mounted with a transmission shaft (026); A transmission frame (027) is fixedly mounted on the inner wall of the accommodating cylinder (013), and the transmission shaft (026) passes through the transmission frame (027); The radial outer wall of the transmission shaft (026) is provided with an annular groove (024), the annular groove (024) is arranged obliquely, and a spherical protrusion which is slidably matched with the annular groove (024) is arranged in the transmission frame (027); An insertion rod (023) which is slidably plugged with the transmission sleeve (014) is fixedly mounted on one end of the transmission shaft (026) away from the transmission plug (025).

10. A distributed condensation process, the process adopting the distributed condensation system according to claim 9, characterized in that: The following steps are involved: A1. Input exhaust gas; A2. Condensate the exhaust gas and discharge the condensate; A3, no condensation of gas at elevated temperature; A4. Recover nitrogen and deliver it for refrigeration.

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