Odor liquefaction system and method based on supersonic refrigeration effect

Abstract

This invention discloses an odor liquefaction system and method based on the ultrasonic cooling effect, belonging to the field of gas purification technology. It includes a pre-separation device, a pressurization device, an ultrasonic liquefaction separation device, and a plasma treatment device. The pre-separation device includes a water washing unit and a water removal unit. The water washing unit has a water washing chamber containing a water medium. The water removal unit is connected to the water washing chamber and contains an adsorbent. The adsorbent is used to adsorb hydrogen sulfide in the gas inside the water removal unit and the moisture carried by the water washing unit. The air inlet of the pressurization device is connected to the outlet of the water removal unit. The ultrasonic liquefaction separation device has a reaction chamber inside that can generate gas swirl to form an ultrasonic cooling effect for gas-liquid separation of odor. The inlet of the plasma treatment device is connected to the liquid outlet pipe. This invention can effectively reduce odor emissions during the treatment and disposal of kitchen waste, avoiding environmental pollution caused by harmful gas emissions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas purification, in particular to an odor liquefaction system and method based on supersonic refrigeration effect. BACKGROUND

[0002] With the continuous improvement of the living standards of residents in China, the production of kitchen waste has increased significantly. According to statistical data, from 2016 to 2022, the production of kitchen waste in China increased from 970 million tons to 1500 million tons.

[0003] The treatment capacity of domestic kitchen waste will continue to increase, and the emission of odor gas cannot be ignored. During the collection and disposal of kitchen waste, the rotting and fermentation of the material will produce a large amount of odor gas, the main components of which are harmful gases such as ammonia, hydrogen sulfide, methyl mercaptan, dimethyl sulfide and dimethyl disulfide, which have high odor threshold, are toxic, have strong irritability and are extremely easy to diffuse into the atmosphere to pollute the environment and endanger human health, so the odor generated during the treatment and disposal of kitchen waste needs to be strictly controlled.

[0004] The components of odor gas are complex and have a very low odor threshold, and there are limited studies on the component analysis and targeted treatment of odor gas in China. Its control and treatment have always been a difficult problem. In terms of odor treatment in kitchen waste plants, China lacks mature treatment processes, and the currently introduced treatment processes such as advanced oxidation process and chemical oxidation absorption combined process have problems such as high cost and difficult maintenance, and there is an urgent need to develop a set of system treatment scheme suitable for local conditions and a high-efficiency and targeted deodorization combined process and integrated equipment. SUMMARY

[0005] The present application aims to overcome the above technical deficiencies and provides an odor liquefaction system and method based on supersonic refrigeration effect, which can effectively reduce the emission of odor gas during the treatment and disposal of kitchen waste and avoid environmental pollution caused by the emission of harmful gases.

[0006] To achieve the above technical purpose, the technical scheme of the present application provides an odor liquefaction system and method based on supersonic refrigeration effect.

[0007] In a first aspect, the present application provides an odor liquefaction system based on supersonic refrigeration effect, comprising:

[0008] A pre-separation device, the pre-separation device comprising a water washing unit and a water removal unit, the water washing unit being internally formed with a water washing cavity provided with a water medium, the water medium being used to contact and combine with ammonia gas to remove ammonia gas in the gas, the water removal unit being internally communicated with the water washing cavity and provided with an adsorbent, the adsorbent being used to adsorb hydrogen sulfide in the gas in the water removal unit and moisture brought by the water washing unit;

[0009] The pressurizing device is connected with the outlet of the water removal unit, and is used for increasing the gas flow rate in the pressurizing device by compressed air.

[0010] The supersonic liquefaction separation device is internally formed with a reaction cavity capable of generating a cyclone of gas to form a supersonic refrigeration effect for gas-liquid separation of the odor gas.

[0011] The inlet of the plasma treatment device is communicated with the liquid outlet pipe, and the plasma treatment device is used for generating active oxygen molecules for oxidation and decomposition of the liquefied odor gas, and further treatment and purification of the liquid separated and enriched by the supersonic liquefaction separation device.

[0012] In the device, the hydrogen sulfide in the odor gas generated by the kitchen waste is treated in advance, the odor gas is pressurized and pre-accelerated, the main components in the odor gas are liquefied and enriched under the supersonic refrigeration effect by the supersonic liquefaction separation device, and finally the plasma treatment device is used for efficient treatment.

[0013] In some embodiments, the water washing unit includes a water washing tank and a water storage component arranged on one side of the water washing tank, and the water storage component has a water mist discharge port communicated with the water washing tank and a water mist supply port for supplying water mist combined with ammonia in the exhaust gas into the water washing cavity.

[0014] In some embodiments, the water storage component includes a water storage tank and a plurality of communication pipes respectively communicated with the water storage tank and the water washing tank, and each communication pipe is connected with a pressurized atomizer, so that the water in the water storage tank can form water mist through the pressurized atomizer and be transported into the water washing tank after entering the communication pipe.

[0015] In some embodiments, the water removal unit includes a water absorption tank and an inner tank arranged in the water absorption tank, and the inner tank is filled with an adsorbent for adsorbing hydrogen sulfide in the odor gas and water brought by the water washing, the water washing unit is communicated with the bottom end of the inner tank through a gas guide pipe, and the inner tank is also communicated with the pressurizing device.

[0016] In some embodiments, the adsorbent is aluminum oxide.

[0017] In some embodiments, the pressurizing device includes a first storage tank for storing unpressurized gas, a second storage tank for storing pressurized gas, a connecting pipeline, and a compressor, the first storage tank and the second storage tank are communicated through the connecting pipeline, and the output end of the compressor is correspondingly connected with the connecting pipeline, so that when the gas flows from the first storage tank to the connecting pipeline, it is compressed by the compressor and discharged to the second storage tank.

[0018] In some embodiments, the supersonic liquefaction separation device comprises a Laval nozzle, the outer periphery of the Laval nozzle is inwardly tapered to form a throat, the inside of the Laval nozzle is formed with a converging section and a diverging section at positions corresponding to the two sides of the throat, the cross-sectional area of the converging section and the diverging section gradually increases from one end close to the throat to the other end, and the liquid outlet pipe is arranged at the lower side of the diverging section.

[0019] In some embodiments, the plasma treatment device comprises a liquefied odor pipeline, a blower, an ion generator, and a reaction kettle, the gas inlet pipe of the blower is provided with a gas inlet pipe, the gas outlet of the blower is connected to the ion generator through the pipeline, the inlet of the liquefied odor pipeline is communicated with the liquid outlet pipe, and the ion generator and the outlet of the liquefied odor pipeline are both communicated with the reaction kettle.

[0020] In some embodiments, the gas inlet pipe is provided with a filter screen.

[0021] In the second aspect, the application further provides a method for liquefying odor based on the supersonic refrigeration effect, which is suitable for the supersonic refrigeration odor liquefying system.

[0022] S100: the odor gas generated by the kitchen waste is first introduced into the water washing unit, the odor gas is contacted with the water medium in the water washing unit, and all ammonia is removed by using the property that ammonia can be dissolved in water at a ratio of 1:700; then, the gas is introduced into the water removal unit from the water washing unit, the hydrogen sulfide in the odor gas and the water brought by the water washing are completely adsorbed by the adsorbent arranged in the water removal unit, and the remaining gas is introduced into the pressurizing device through the gas guide pipe;

[0023] S200: the odor gas passing through the hydrogen sulfide pretreatment link is introduced into the inside of the pressurizing device, the air is continuously compressed by the pressurizing device, the continuous air pressure is obtained, and the odor gas is pre-accelerated by the pressurizing.

[0024] S300: the odor gas flow enters the reaction cavity of the supersonic liquefaction separation device in the form of a cyclone, the cyclone is strengthened due to the increase of the speed, the mixed gas is adiabatically expanded in the supersonic liquefaction separation device to generate a low-temperature effect, the heavy hydrocarbon and other impurities in the mixed gas are condensed and liquefied, and the gas-liquid separation is caused under the action of a huge centrifugal force, so that the effect of separating the odor components is achieved.

[0025] S400: the liquid droplets formed by the liquefaction of the odor gas passing through the supersonic liquefaction separation device flow to the plasma treatment device, a large number of active oxygen molecule groups generated by the plasma treatment device oxidize and decompose the odor in the odor liquid, the liquid separated and enriched by the supersonic liquefaction separation device is further treated and purified, and finally discharged to the atmosphere in the form of gas.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] The present application removes hydrogen sulfide in advance, effectively reduces the odor in the subsequent treatment process, and improves the treatment efficiency.

[0028] The present application combines the supersonic refrigeration effect and the active oxygen molecule and odor gas oxidation decomposition treatment technology produced by the plasma treatment device, realizes efficient treatment of harmful gas at a lower temperature and energy consumption, and has lower energy consumption and raw material consumption compared with the prior art, thereby realizing effective saving of energy and resources.

[0029] In the treatment process, the present application effectively reduces harmful gas emissions and reduces environmental pollution, which helps to improve the surrounding environmental quality.

[0030] The present application is suitable for urban kitchen waste treatment center, catering industry, food processing plant and agricultural breeding farm and other scenes, and has wide application potential due to simple, efficient and environmentally friendly treatment process, which can significantly improve the quality and efficiency of various industries in treating odor generated by kitchen waste, and make positive contribution to the construction of green and sustainable society. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is the overall three-dimensional structure schematic diagram of an embodiment of the odor liquefaction system based on supersonic refrigeration effect provided by the present application;

[0032] Figure 2 is Figure 1 the three-dimensional structure schematic diagram of the pre-separation device of the odor liquefaction system based on supersonic refrigeration effect in

[0033] Figure 3 is Figure 1 the main view cross-sectional structure schematic diagram of the pre-separation device of the odor liquefaction system based on supersonic refrigeration effect in

[0034] Figure 4 is Figure 1 the side view cross-sectional structure schematic diagram of the pre-separation device of the odor liquefaction system based on supersonic refrigeration effect in

[0035] Figure 5 is Figure 1 the three-dimensional structure schematic diagram of the pressurizing device of the odor liquefaction system based on supersonic refrigeration effect in

[0036] Figure 6 is Figure 1A schematic diagram of the main cross-sectional structure of the pressurization device in the odor liquefaction system based on the supersonic cooling effect;

[0037] Figure 7 yes Figure 1 A schematic diagram of the side cross-sectional structure of the Laval nozzle in the odor liquefaction system based on the supersonic cooling effect;

[0038] Figure 8 yes Figure 1 A three-dimensional structural diagram of the plasma treatment device in the odor liquefaction system based on the supersonic cooling effect.

[0039] Figure 9 This is a flowchart of the odor liquefaction method based on the supersonic cooling effect provided by the present invention.

[0040] In the picture:

[0041] 1. Pre-separation device; 11. Washing unit; 111. Washing tank; 112. Water storage component; 113. Water storage tank; 114. Connecting pipe; 12. Water removal unit; 121. Suction tank; 122. Inner tank; 123. Air guide pipe;

[0042] 2. Pressurization device; 21. First storage tank; 22. Second storage tank; 23. Connecting pipe; 24. Compressor; 25. Crank structure; 26. Piston; 27. Motor;

[0043] 3. Supersonic liquefaction separation device; 31. Laval nozzle; 32. Throat; 33. Converging section; 34. Diverging section; 35. Liquid outlet pipe; 36. Air inlet; 37. Air outlet;

[0044] 4. Plasma treatment device; 41. Liquefied odor gas pipeline; 42. Blower; 43. Ion generator; 44. Reactor; 45. Gas inlet pipe; 46. Filter screen. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0046] This invention provides a system and method for liquefying odorous gases based on the supersonic cooling effect, which will be described below.

[0047] like Figures 1 to 8 As shown, a specific embodiment of the present invention discloses an odor liquefaction system based on the supersonic cooling effect, including a pre-separation device 1, a pressurization device 2, a supersonic liquefaction separation device 3, and a plasma treatment device 4.

[0048] The pre-separation device 1 includes a water washing unit 11 and a water removal unit 12. The water washing unit 11 has a water washing chamber with a water medium inside. Taking advantage of the property that ammonia can be dissolved in water at a ratio of 1:700, the water medium can come into contact with and combine with the ammonia to remove the ammonia in the gas. The water washing unit 11 is connected to the water washing chamber and is equipped with an adsorbent. The adsorbent is used to adsorb hydrogen sulfide in the odorous gas and the water carried by the water washing.

[0049] The air inlet 36 of the pressurizing device 2 is connected to the outlet of the dehydration unit 12, and is used to increase the gas flow rate inside the pressurizing device by compressing air.

[0050] The interior of the supersonic liquefaction separation device 3 forms a reaction chamber that enables the gas to swirl and form a supersonic cooling effect to separate the odorous gas into liquid. The supersonic liquefaction separation device 3 is provided with an air inlet 36, an air outlet 37, and a liquid outlet pipe 35 that are connected to the reaction chamber. The air inlet 36 is connected to the outlet of the pressurizing device 2, so that the gas accelerated by the pressurizing device 2 enters the reaction chamber through the air inlet 36. The gas in the reaction chamber forms qualified dry gas and odorous liquid under the supersonic cooling effect. The dry gas and odorous liquid after gas-liquid separation are discharged through the air outlet 37 and the liquid outlet pipe 35, respectively.

[0051] The inlet of the plasma treatment device 4 is connected to the outlet pipe 35. The plasma treatment device 4 is used to generate active oxygen molecules, which are then used to oxidize and decompose the liquefied odorous gas, and to further treat and purify the malodorous liquid separated and enriched by the ultrasonic liquefaction separation device 3.

[0052] In this device, addressing the shortcomings of existing technologies in treating malodorous odors and harmful gas emissions, hydrogen sulfide is removed in advance. The water medium in the pre-separation unit 1 allows it to contact and combine with ammonia in the waste gas, removing all ammonia first. Then, the adsorbent in the dehydration unit 12 adsorbs hydrogen sulfide from the gas inside the dehydration unit and the moisture carried over from the washing unit, thus pre-treating the hydrogen sulfide in the odorous gas from kitchen waste. After treatment by the pre-separation unit 1, the gas enters the pressurization unit 2, where compressed air increases the gas processing speed, achieving pre-acceleration of the odorous gas and creating favorable conditions for the subsequent ultrasonic cooling effect. The ultrasonic liquefaction separation unit 3 liquefies and enriches the main components of the odorous gas under ultrasonic cooling. Finally, the plasma treatment unit 4 generates active oxygen molecules that can oxidize and decompose the liquefied odorous gas, further treating and purifying the liquid obtained from the nozzle separation and enrichment, achieving efficient gas treatment.

[0053] It should be noted that the water medium generated by the water washing unit 11 can be water mist, water droplets, etc.

[0054] likeFigures 2 to 4 As shown, in some embodiments, to improve the removal effect of ammonia, the water medium generated by the water washing unit 11 is preferably water mist. The water washing unit 11 includes a water washing tank 111 and a water storage component 112 disposed on one side of the water washing tank 111. A water washing chamber is formed inside the water washing tank 111. The water storage component 112 includes a water storage tank 113 and several connecting pipes 114 that respectively connect the water storage tank 113 and the water washing tank 111. A water pump connected to the connecting pipes 114 is also provided in the water washing chamber to generate dynamic water. Water is supplied to the washing tank 111 through the connecting pipe 114. The washing chamber and the connecting pipe 114 are both installed on the washing tank 111. Each connecting pipe 114 is equipped with a pressure atomizer so that the water in the water storage tank 113 can be pressurized by the pressure atomizer after entering the connecting pipe 114 to form water mist, and the water mist is output to the washing tank 111 so that the ammonia in the gas in the washing tank 111 can fully contact the water mist. Taking advantage of the property that ammonia can dissolve in water, all the ammonia is removed first.

[0055] Furthermore, the water storage component 112 can also be a water pump and a water pipe. The water pump is used to pump water into the washing tank 111 through the water pipe. The air inlet 36 provided on the washing tank 111 is lower than the water level inside the washing tank 111 so that the gas can come into contact with the water inside the washing tank 111 and remove the ammonia. The gas after removing the ammonia is discharged into the water suction tank 121 through the air guide pipe 123 above it.

[0056] like Figure 4 As shown, in some embodiments, the dewatering unit 12 includes a water absorption tank 121 and an inner tank 122 disposed inside the water absorption tank 121. The top of the water washing tank 111 in the water washing unit 11 is connected to the bottom of the inner tank 122 through a gas guide pipe 123. The inner tank 122 is also connected to the pressurizing device 2. The inner tank 122 is installed in the middle of the water absorption tank 121 by a bracket, and the inner tank 122 is filled with an adsorbent. The adsorbent can adsorb hydrogen sulfide in the malodorous gas and the moisture brought by the water washing.

[0057] In some embodiments, the adsorbent is preferably alumina.

[0058] In use, the malodorous gas generated by kitchen waste is first introduced into the water washing unit 11. Water in the water storage tank 113 installed on one side of the water washing unit 11 is atomized into water mist by a pressurized atomizer, so that the water can better contact and combine with the ammonia gas. Taking advantage of the property that ammonia gas can dissolve in water at a ratio of 1:700, all the ammonia gas is removed first. Then, the gas is introduced into the inner tank 122 from below through the gas guide pipe 123, and comes into full contact with the modified alumina in the device from bottom to top, so that the hydrogen sulfide in the malodorous gas and the moisture brought by the water washing are completely adsorbed. The remaining gas is then introduced into the next device through the pipeline, thereby achieving a good pretreatment effect.

[0059] Furthermore, in other embodiments, the adsorbent may also be activated carbon or the like, to adsorb hydrogen sulfide from the odorous gas and moisture from the washing process.

[0060] like Figure 5 , Figure 6 As shown, in some embodiments, in order to enable the odor gas to be better liquefied and separated in the Laval nozzle 31, the gas needs to reach a certain pressure and velocity in advance; the pressurization device 2 includes a first storage tank 21 for storing unpressurized gas, a second storage tank 22 for storing pressurized gas, a connecting pipe 23 and a compressor 24. The first storage tank 21 is connected to the inner tank 122 through a pipe, and the first storage tank 21 and the second storage tank 22 are connected through the connecting pipe 23, so that the gas treated by the dehydration unit 12 can enter the first storage tank 21 through the pipe, and the gas in the first storage tank 21 can enter the second storage tank 22 through the connecting pipe 23.

[0061] When the gas reaches 0.2 MPa, it can be accelerated to supersonic speeds after passing through the Laval nozzle 31. To achieve this pressure, the compressor 24 is preferably a reciprocating compressor 24. The output end of the reciprocating compressor 24 is connected to the connecting pipe 23 so that when the gas flows from the first storage tank 21 to the connecting pipe 23, it can be compressed by the reciprocating compressor 24 and then discharged to the second storage tank 22. By compressing the gas through the reciprocating compressor 24, the gas can meet the required pressure. Compared with other compressors 24, the reciprocating compressor 24 has a simpler principle and is more energy-efficient. Under conditions where the required pressure is not high, it is more suitable for the needs of the device.

[0062] Furthermore, the pressurizing device 2 also includes a motor 27, and the compressor 24 is provided with a crank structure 25 and a piston 26. One end of the crank structure 25 is connected to the drive end of the motor 27, and the other end is connected to the piston 26. By driving the crank structure 25 to move, the piston 26 is driven to reciprocate, so as to continuously compress air and obtain continuous air pressure.

[0063] Furthermore, the compressor 24 can also be a screw compressor 24, replacing the piston compressor 24.

[0064] like Figure 7 As shown, in some embodiments, the supersonic liquefaction separation device 3 includes a Laval nozzle 31. The outer periphery of the Laval nozzle 31 contracts inward to form a throat 32. The interior of the Laval nozzle 31 and the sides of the throat 32 are respectively formed with a tapering section 33 and a diffusing section 34. The end of the Laval nozzle 31 corresponding to the tapering section 33 forms an air inlet 36, and the end corresponding to the diffusing section 34 forms an air outlet 37. The cross-sectional area of ​​the tapering section 33 and the diffusing section 34 gradually increases from the end near the throat 32 to the other end.

[0065] This accelerated gas-liquid separation device causes the odorous gas flow to enter the modified Laval nozzle 31 in the form of a swirling flow under the action of the swirling structure in the pressurization and pre-acceleration module. The swirling principle is as follows: the high-speed gas flow is guided by the swirling structure and enters the Laval nozzle in a tangential direction and spirals along the pipe wall to form a high-speed swirling flow. After passing through the Laval nozzle 31, the swirling flow is strengthened due to the increased speed. The mixed gas expands adiabatically in the Laval nozzle 31, thereby producing a low-temperature effect. Impurities such as heavy hydrocarbons in the mixed gas condense and liquefy, and gas-liquid separation occurs under the action of the huge centrifugal force of the swirler, thereby achieving the effect of separating odorous components. The liquid outlet pipe 35 is located at one end of the air outlet 37 of the Laval nozzle 31 and below the diffuser section 34. Under the action of the huge centrifugal force of the hydrocyclone, the droplets are thrown to the pipe wall and flow to the end of the inner wall of the pipe. Then, under the action of gravity, they flow from the lower end through the liquid outlet pipe 35 to the plasma treatment device 4. According to the coaxial swirling, the dry gas is at the entire axis. Under the action of the shock wave, the speed of the dry gas changes from supersonic to subsonic, the pressure begins to rise, the qualified dry gas is discharged smoothly, and the liquefied odor gas successfully enters the next device.

[0066] Furthermore, the Laval nozzle 31 in the supersonic liquefaction separation device 3 is preferably a single-stage nozzle, which has a set of throat 32, converging section 33 and diverging section 34. In other embodiments, a multi-stage nozzle can be used instead of a single-stage nozzle. By setting multiple sets of throat 32, converging section 33 and diverging section 34, the separation effect can be further improved.

[0067] like Figure 8 As shown, in some embodiments, the plasma treatment device 4 includes a liquefied odor pipe 41, a blower 42, an ion generator 43, and a reaction vessel 44. The inlet of the liquefied odor pipe 41 is connected to the liquid outlet pipe 35 of the Laval nozzle 31, and its outlet is connected to the reaction vessel 44, so that the liquid portion in the Laval nozzle 31 flows to the reaction vessel 44 through the liquefied odor pipe 41. The ion generator 43 uses a high-voltage transformer to boost the power frequency voltage to the required voltage, and uses the DC high voltage at the tip of the carbon brush to generate a high corona discharge, which releases a large number of electrons at high speed. These electrons are unstable and will quickly combine with oxygen in the surrounding environment to generate positive and negative oxygen ions.

[0068] The blower 42 has a gas inlet pipe 45 at its air inlet 36 and an outlet 37 connected to an ion generator 43 via a pipe. The outlet of the ion generator 43 is connected to the reaction vessel 44. Driven by the blower 42, external airflow flows into the reaction vessel 44 through the blower 42 and the high-voltage transformer. The airflow of the blower 42 is controlled by the system and adjusted according to the reaction speed of the current deodorization process. Finally, an appropriate amount of pure air is sent into the ion generator 43 and enters the reaction vessel 44 under the action of the airflow, where it reacts with the odorous liquid particles. A large number of active oxygen molecules in the airflow are instantly oxidized and decomposed with the odorous gas, resulting in high deodorization efficiency.

[0069] Air carrying a large number of positive and negative oxygen ions enters the reactor 44 through a tangential air passage. The interior of the reactor 44 has a spherical structure. The airflow enters along the tangential direction of the reactor 44 wall and turns to both sides and downwards during the rotational motion. Finally, during the air intake process, an organized airflow movement around the axis of the reactor 44 is formed, namely the intake vortex. When the odorous liquid particles enter the reactor 44 from top to bottom, due to the low pressure in the central area, the odorous liquid particles will be quickly mixed into the intake vortex and rapidly purified. The reaction products will be discharged outside the device through the discharge port set on the reactor 44 along with the vortex.

[0070] Furthermore, in the plasma treatment device 4, a photocatalyst can also be used to replace the plasma method with photocatalysis. The photocatalyst generates active oxygen molecules under light irradiation to achieve the oxidative decomposition of malodorous gases.

[0071] Furthermore, in some embodiments, a filter screen 46 is provided inside the gas inlet pipe 45 to block external impurities, which can further purify the air passing through the blower 42 and remove dust and moisture.

[0072] To better implement the odor liquefaction system based on the supersonic cooling effect in the embodiments of the present invention, based on the odor liquefaction system based on the supersonic cooling effect, correspondingly, as follows: Figure 1 As shown, the present invention also provides a method for liquefying odorous gases based on the supersonic cooling effect, applicable to the above-mentioned odorous gas liquefaction system based on the supersonic cooling effect, the method comprising:

[0073] S100: The malodorous gas generated by kitchen waste is first introduced into the water washing unit 11. The water medium in the water washing unit 11 comes into contact with the waste gas, and the ammonia gas is removed first by taking advantage of the property that ammonia gas can be dissolved in water at a ratio of 1:700. Then, the gas enters the dehydration unit 12 from the water washing unit 11. The adsorbent set in the dehydration unit 12 completely adsorbs the hydrogen sulfide in the malodorous gas and the water carried by the water washing. The remaining gas is then introduced into the pressurization device 2 through the gas guide pipe 123.

[0074] S200: The odorous gas that has passed through the hydrogen sulfide pretreatment stage enters the interior of the pressurization device 2, where the pressurization device 2 continuously compresses the air to obtain continuous air pressure, and pre-accelerates the odorous gas by pressurizing it.

[0075] S300: The odorous gas flow enters the reaction chamber of the supersonic liquefaction separation device 3 in the form of a swirling flow. Due to the increased speed, the swirling flow is strengthened. The mixed gas expands adiabatically in the supersonic liquefaction separation device 3, thereby generating a low temperature effect. Impurities such as heavy hydrocarbons in the mixed gas condense and liquefy, and gas-liquid separation occurs under the action of the huge centrifugal force of the cyclone separator, thereby achieving the effect of separating odorous components.

[0076] S400: After being processed by the ultrasonic liquefaction separation device 3, the droplets formed by the liquefaction of odorous gas flow through the liquid outlet pipe 35 to the plasma treatment device 4. The large number of active oxygen molecules generated by the plasma treatment device 4 oxidize and decompose the odorous gas in the malodorous liquid, further processing and purifying the liquid separated and enriched by the ultrasonic liquefaction separation device 3, and finally discharging it into the atmosphere in gaseous form.

[0077] The present invention also provides a more specific embodiment to illustrate the above steps S100 to S400:

[0078] Step 1: The malodorous gas generated by kitchen waste enters the water washing tank 111 through the inlet. The water in the water storage tank 113 is atomized by the compressor and then transported to the water washing tank 111 through the connecting pipe 114, so that the ammonia in the exhaust gas can fully contact and combine with the water mist to achieve the effect of removing ammonia. Then, the exhaust gas after removing ammonia enters the inner tank 122 of the water absorption tank 121 through the air guide pipe 123 and enters from the lower end of the inner tank 122, flowing from bottom to top. The exhaust gas fully contacts the modified alumina in the inner tank 122, so that the hydrogen sulfide in the malodorous gas and the water carried by the washing are completely adsorbed by it.

[0079] Step 2: The waste gas treated by the pre-separation device 1 enters the first storage tank 21. When it enters the second storage tank 22 through the connecting pipe 23, it is compressed by the compressor 24 to obtain continuous air pressure, and the pressurized and accelerated gas is discharged to the second storage tank 22.

[0080] Step 3: After being accelerated by the pressurizing device 2, the gas enters the Laval nozzle 31 through the inlet 36 in the form of a swirling flow under the action of the swirling structure. It then passes sequentially through the converging section 33, throat 32, and diverging section 34 of the Laval nozzle 31. After passing through the nozzle, the swirling flow is strengthened due to the increased speed. The mixed gas undergoes adiabatic expansion in the Laval nozzle 31, generating a low-temperature effect. Heavy hydrocarbons and other impurities in the mixed gas condense and liquefy, and gas-liquid separation occurs under the enormous centrifugal force of the swirler, thus achieving the effect of separating odorous components. Under the enormous centrifugal force, droplets are thrown against the pipe wall and flow to the end of the inner wall of the pipe. Then, under the action of gravity, they flow from the lower end through the liquid outlet 35 to the plasma treatment device 4. According to the coaxial swirling flow, the dry gas is at the entire axis. Under the action of the shock wave, the speed of the dry gas changes from supersonic to subsonic, and the pressure begins to rise. The qualified dry gas is smoothly discharged through the outlet 37.

[0081] Step 4: The liquefied odorous gas is discharged into the reaction vessel 44 through the liquefied odorous gas pipe 41. The ion generator 43 uses a high-voltage transformer to boost the power frequency voltage to the required voltage and uses the DC high voltage at the tip of the carbon brush to generate a high corona discharge, releasing a large number of electrons at high speed. These electrons are unstable and quickly combine with oxygen in the surrounding environment to generate positive and negative oxygen ions. Driven by the blower 42, the external airflow flows into the reaction vessel 44 through the blower 42 and the high-voltage transformer, sending an appropriate amount of pure air into the ion generator 43. Under the action of the airflow, the air enters the reaction vessel 44 and reacts with the odorous liquid particles therein. The large number of active oxygen molecules in the airflow instantly oxidize and decompose the odorous gas, resulting in high deodorization efficiency.

[0082] Air carrying a large number of positive and negative oxygen ions enters the reactor 44 through a tangential air passage. The airflow enters along the tangential direction of the reactor 44 wall and turns to both sides and downwards during the rotational motion, ultimately forming an organized airflow movement around the axis of the reactor 44 during the air intake process, namely the intake vortex. When odorous liquid particles enter the reactor 44 from top to bottom, due to the low pressure in the central area, the odorous liquid particles will quickly mix into the intake vortex and be rapidly purified. The reaction products will be discharged outside the device through the discharge port provided on the reactor 44 along with the vortex.

[0083] This invention addresses the shortcomings of existing technologies in treating malodorous odors and harmful gas emissions through a hydrogen sulfide pretreatment step, effectively reducing malodorous odors in subsequent treatment processes. In addition, the pressurized pre-acceleration treatment step can increase the gas processing speed, creating favorable conditions for the subsequent supersonic cooling effect step, thereby improving the overall processing efficiency.

[0084] This invention combines the supersonic cooling effect and plasma treatment technology to achieve efficient treatment of harmful gases under lower temperature and energy consumption conditions. Compared with existing technologies, this treatment method has lower energy consumption and raw material consumption, thereby achieving effective savings in energy and resources.

[0085] This invention effectively reduces harmful gas emissions and mitigates environmental pollution during the treatment process, contributing to improved environmental quality. Furthermore, the use of environmentally friendly treatment methods, such as plasma treatment, further reduces the environmental impact of the treatment process.

[0086] This invention is applicable to various scenarios, including urban food waste treatment centers, the catering industry, food processing plants, and agricultural farms. Due to its simple, efficient, and environmentally friendly processing, it has broad application potential and can significantly improve the quality and efficiency of odor control in various industries, making a positive contribution to building a green and sustainable society.

[0087] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A gas liquefaction system based on supersonic cooling effect, characterized in that, include: A pre-separation device includes a water washing unit and a water removal unit. The water washing unit has a water washing chamber with a water medium inside. The water medium is used to contact and combine with ammonia gas to remove ammonia gas from the gas. The water removal unit is connected to the water washing chamber and has an adsorbent inside. The adsorbent is used to adsorb hydrogen sulfide in the gas inside the water removal unit and the water carried by the water washing unit. A pressurizing device, wherein the air inlet of the pressurizing device is connected to the outlet of the dewatering unit, and is used to increase the gas flow rate inside the pressurizing device by compressing air; An ultrasonic liquefaction separation device is provided, wherein the interior of the ultrasonic liquefaction separation device forms a reaction chamber that enables the gas to swirl to form an ultrasonic cooling effect for gas-liquid separation of odorous gas. The ultrasonic liquefaction separation device is provided with an air inlet, an air outlet and a liquid outlet pipe that are connected to the reaction chamber. The air inlet is connected to the outlet of the pressurization device. A plasma treatment device, wherein the inlet of the plasma treatment device is connected to the outlet pipe, and the plasma treatment device is used to generate active oxygen molecules for oxidation and decomposition of liquefied odorous gas. The supersonic liquefaction separation device includes a Laval nozzle, the outer periphery of which contracts inward to form a throat, and the interior of the Laval nozzle and the sides of the throat are respectively formed with a tapering section and a diffusing section. The cross-sectional area of ​​the tapering section and the diffusing section gradually increases from one end near the throat to the other end, and the liquid outlet pipe is located on the lower side of the diffusing section.

2. The odor gas liquefaction system based on supersonic cooling effect according to claim 1, characterized in that, The water washing unit includes a water washing tank and a water storage component located on one side of the water washing tank. The water storage component has a water mist discharge port connected to the water washing tank for supplying water mist to the water washing chamber to combine with ammonia in the exhaust gas.

3. The odor gas liquefaction system based on supersonic cooling effect according to claim 2, characterized in that, The water storage component includes a water tank and several connecting pipes that connect the water tank and the washing tank respectively. Each connecting pipe is connected to a pressurized atomizer so that water from the water tank can be atomized into water mist by the pressurized atomizer after entering the connecting pipe and then transported to the washing tank.

4. The odor gas liquefaction system based on supersonic cooling effect according to claim 1, characterized in that, The dewatering unit includes a water-absorbing tank and an inner tank located inside the water-absorbing tank. The inner tank is filled with an adsorbent for adsorbing hydrogen sulfide and moisture in the malodorous gas. The water washing unit is connected to the bottom of the inner tank through a gas guide pipe. The inner tank is also connected to the pressurizing device.

5. The odor gas liquefaction system based on supersonic cooling effect according to claim 1, characterized in that, The adsorbent is aluminum oxide.

6. The odor gas liquefaction system based on supersonic cooling effect according to claim 1, characterized in that, The pressurization device includes a first storage tank for storing unpressurized gas, a second storage tank for storing pressurized gas, a connecting pipe, and a compressor. The first storage tank and the second storage tank are connected by the connecting pipe. The output end of the compressor is connected to the connecting pipe so that when the gas flows from the first storage tank to the connecting pipe, it is compressed by the compressor and discharged to the second storage tank.

7. The odor gas liquefaction system based on supersonic cooling effect according to claim 1, characterized in that, The plasma treatment device includes a liquefied odorous gas pipeline, a blower, an ion generator, and a reaction vessel. The blower has a gas inlet pipe at its inlet and its outlet is connected to the ion generator through a pipe. The inlet of the liquefied odorous gas pipeline is connected to the liquid outlet pipe. The outlets of the ion generator and the liquefied odorous gas pipeline are both connected to the reaction vessel.

8. The odor gas liquefaction system based on supersonic cooling effect according to claim 7, characterized in that, A filter screen is installed inside the gas inlet pipe.

9. A method for liquefying odorous gases based on supersonic cooling effect, applicable to the odorous gas liquefaction system based on supersonic cooling effect as described in any one of claims 1 to 8, characterized in that, The method includes: S100: The malodorous gas generated by kitchen waste is first introduced into the water washing unit. The water medium in the water washing unit comes into contact with the waste gas, and the ammonia gas is removed first by taking advantage of the property that ammonia gas can be dissolved in water at a ratio of 1:

700. Then, the gas enters the water removal unit from the water washing unit. The adsorbent set in the water removal unit completely adsorbs the hydrogen sulfide in the malodorous gas and the water brought by the water washing. The remaining gas is then introduced into the pressurization device through the gas guide pipe. S200: The odorous gas that has passed through the hydrogen sulfide pretreatment stage enters the interior of the pressurization device, where the pressurization device continuously compresses the air to obtain continuous air pressure, and pre-accelerates the odorous gas by pressurizing it. S300: The odorous gas flow enters the reaction chamber of the ultrasonic liquefaction separation device in the form of a swirling flow, and is further accelerated. The mixed gas expands adiabatically in the ultrasonic liquefaction separation device, thereby generating a low temperature effect. The heavy hydrocarbon impurities in the mixed gas condense and liquefy, and gas-liquid separation occurs under the action of huge centrifugal force, thereby achieving the effect of separating odorous components. S400: After being processed by the supersonic liquefaction separation device, the droplets formed by the liquefaction of odorous gas flow to the plasma treatment device. The large number of active oxygen molecules generated by the plasma treatment device oxidize and decompose the odorous gas in the malodorous liquid. The liquid separated and enriched by the supersonic liquefaction separation device is further processed and purified, and finally discharged into the atmosphere in gaseous form.

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