Liquid food gas hydrate concentration equipment

Abstract

The utility model relates to the technical field of liquid food concentration, in particular to liquid food gas hydrate concentration equipment which comprises a gas tank, a concentration tank and a concentrated solution collecting device. The concentration tank is used for placing a liquid material and providing a gas-liquid reaction space; the concentration tank is communicated with the gas tank through a gas delivery pipe, and a first-stage precooling device and a second-stage precooling device are sequentially arranged between the concentration tank and the gas tank; the first-stage pre-cooling device is used for pre-cooling gas flowing through the gas conveying pipe for the first time; the secondary precooling device is used for carrying out secondary precooling on the gas subjected to primary precooling; a three-stage pre-cooling material is arranged in the cavity of the concentration tank and is used for performing three-time pre-cooling on the material in the concentration tank; a stirring paddle is arranged in the concentration tank and is used for stirring materials in the concentration tank to promote gas-liquid reaction; the concentrated solution collecting device is connected to a discharge hole of the concentration tank and is used for collecting a concentrated solution finished product. The liquid food gas hydrate concentration equipment is good in gas pre-cooling effect, high in hydrate generation efficiency, good in finished product quality, energy-saving and environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid food freezing concentration, in particular to a liquid food gas hydrate concentration equipment. BACKGROUND

[0002] Concentrated liquid is an important circulation unit in the industries of fruit and vegetable juice, dairy products, functional food, and pre-prepared condiments, such as concentrated juice, concentrated milk, concentrated functional ingredient extract, concentrated soup, etc. The core of the concentrated liquid is to reduce the volume, extend the shelf life, reduce the transportation cost, or increase the product value. Common liquid food concentration technologies include heat concentration, membrane concentration (ultrafiltration, microfiltration, reverse osmosis), and freezing concentration, but all of them have different problems such as loss of heat-sensitive ingredients, high energy consumption, and serious pollution. Therefore, hydrate concentration technology has attracted attention.

[0003] Hydrate concentration is a technology that uses the characteristics of forming cage-shaped hydrates with water under low temperature and high pressure (such as CO2, CH4), and realizes solute concentration by controlling the generation and decomposition of hydrates. This technology has the characteristics of energy saving, high efficiency, and high retention rate of nutritional ingredients, and does not need to add chemical reagents, which can significantly reduce production costs and ensure product quality.

[0004] However, the existing hydrate concentration technology has not yet matured in the field of food, and there are the following problems: the gas precooling efficiency is insufficient, the hydrate generation rate is slow (<1kg / m 3 ·h), the gas dissolution causes the deterioration of the material quality, and additional neutralizing agents need to be added, which affects the natural properties of the liquid food. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide a liquid food gas hydrate concentration equipment, which has the advantages of high gas precooling efficiency, high hydrate generation efficiency, and low energy consumption.

[0006] The present application is realized by the following technical solutions:

[0007] The application provides a liquid food gas hydrate concentration device, which comprises a gas tank, a concentration tank and a concentrated liquid collecting device connected in sequence; the concentration tank is used for placing liquid material and providing a gas-liquid reaction space; an air inlet of the concentration tank is connected with the gas tank through a gas conveying pipe, a first-stage pre-cooling device and a second-stage pre-cooling device are arranged on the gas conveying pipe between the concentration tank and the gas tank in sequence; the first-stage pre-cooling device is used for pre-cooling gas flowing through the gas conveying pipe for the first time; the second-stage pre-cooling device is used for pre-cooling the gas pre-cooled for the first time for the second time; a third-stage pre-cooling material is arranged in the cavity of the concentration tank, and the third-stage pre-cooling material is used for pre-cooling the material in the concentration tank for the third time; a stirring paddle is arranged in the concentration tank, and the stirring paddle is used for stirring the material in the concentration tank to promote the gas-liquid reaction; and the concentrated liquid collecting device is connected with a discharge port of the concentration tank and used for collecting concentrated liquid products.

[0008] In one of the embodiments, the first-stage pre-cooling device comprises a spiral coil pipe and a refrigerant box; the spiral coil pipe is connected with the gas conveying pipe between the gas tank and the second-stage pre-cooling device; the refrigerant box is used for placing the spiral coil pipe, and the refrigerant box is cooled by a refrigerating machine and used for pre-cooling the gas flowing through the spiral coil pipe to a first preset temperature for the first time.

[0009] In one of the embodiments, the second-stage pre-cooling device comprises a semiconductor refrigeration sheet, which is arranged outside the gas conveying pipe between the first-stage pre-cooling device and the concentration tank and used for pre-cooling the gas to a second preset temperature for the second time.

[0010] In one of the embodiments, the concentration device further comprises a gas-liquid strengthening device, which comprises a porous distributor and an ultrasonic vibrator; the porous distributor is arranged in the cavity of the concentration tank and is submerged in the liquid material in the cavity; an air inlet end of the porous distributor is connected with the air inlet of the concentration tank, a plurality of micropores are arranged on the porous distributor, the micropores are used for allowing the gas to flow out and react with the liquid material to generate gas bubbles; and the ultrasonic vibrator is arranged on the outer wall of the concentration tank and is used for promoting the gas-liquid reaction, promoting the formation of ice crystal nuclei of gas hydrate and breaking the liquid film boundary layer through cavitation effect to regulate the size of ice crystal.

[0011] In one of the embodiments, the porous distributor is sequentially provided with a plurality of gradient microchannels from bottom to top, and the end of the porous distributor is uniformly provided with a plurality of micropores with a porosity of 25%-35%; the pore diameter of the plurality of gradient microchannels gradually decreases from bottom to top.

[0012] In one of the embodiments, the third-stage pre-cooling material is a phase change material embedded in the outer wall of the porous distributor.

[0013] In one embodiment, the gas-liquid enhancement device further includes a booster pump, which is disposed on the gas delivery pipe between the secondary precooling device and the gas inlet of the concentration tank, for pressurizing the gas to a preset pressure value and pumping it into the cavity of the concentration tank.

[0014] In one embodiment, the concentration equipment further includes a waste cooling recovery unit; the recovery pipe of the waste cooling recovery unit is connected between the outlet of the concentration tank and the inlet of the primary precooling device, for receiving the decomposed hydrate gas back to the inlet of the primary precooling device; the recovery pipe is a finned tube.

[0015] In one embodiment, the device further includes a central control module and a monitoring module electrically connected to the central control module; the monitoring module includes a flow meter disposed at the air inlet of the concentration tank, and a temperature sensor, a pressure sensor, and a pH sensor disposed inside the cavity of the concentration tank; the flow meter is used to monitor the air inlet flow rate; the temperature sensor is used to detect the material temperature inside the cavity of the concentration tank; the pressure sensor is used to detect the cavity pressure of the concentration tank; the pH sensor is used to monitor the acidity or alkalinity of the material inside the cavity of the concentration tank; the central control module is used to receive the monitoring parameters from the monitoring module, generate control signals, and transmit them to corresponding components to achieve control of the concentration environment; the control signals include an air inlet control signal, a precooling power control signal for each precooling device, and an air inlet pressure control signal for the concentration tank.

[0016] In one embodiment, the concentration device further includes a human-machine interaction module; the human-machine interaction module receives the detection parameters from the monitoring module and generates data display.

[0017] The liquid food gas hydrate concentration equipment provided in this application incorporates a primary precooling device and a secondary precooling device on the gas delivery pipe. The primary precooling device precools the gas flowing through the gas delivery pipe, while the secondary precooling device further precools the gas after the initial precooling. A special precooling material is also installed inside the concentration tank to achieve tertiary precooling. This multi-stage precooling gradually lowers the gas temperature to the operating temperature, effectively solving the problem of insufficient gas precooling efficiency, promoting rapid gas hydrate formation, and minimizing temperature changes within the concentration tank after tertiary precooling. This results in higher gas utilization and avoids deterioration of the concentrate quality due to excessive gas dissolution, thus eliminating the need for food neutralizers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a liquid material freezing and concentration device provided in an embodiment of this application.

[0019] Figure 2This is a schematic diagram of the structure of a porous distributor provided in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of the structure of a primary precooling device provided in an embodiment of this application.

[0021] Figure 4 This is a schematic diagram illustrating the working principle of the central control module provided in one embodiment of this application.

[0022] Labeling Explanation: 1. Gas Tank; 2. Gas Pipeline; 3. Primary Precooling Unit; 31. Refrigerant Box; 32. Spiral Coil; 4. Secondary Precooling Unit; 5. Concentrator; 51. Air Inlet; 52. Exhaust Port; 53. Discharge Port; 6. Porous Distributor; 61. Phase Change Material; 62. Air Inlet; 63. Microchannel; 64. Micropore; 7. Ultrasonic Vibrator; 8. Agitator; 9. Residual Cooling Recovery Unit; 10. Concentrate Collection Device; 11. Gas Collection Device; 12. Booster Pump; 13. Monitoring Module; 14. Central Control Module; 15. Human-Machine Interface Module. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, a detailed description of specific embodiments of this application is provided below. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] This application provides a liquid food gas hydrate concentration device, which can be applied to the freezing and concentration of liquid materials in food processing, biology, medicine, chemistry and other fields, and is especially suitable for the freezing processing of liquid foods.

[0027] likeFigure 1 As shown, the liquid material freezing and concentration equipment includes: a gas tank 1, a concentration tank 5, and a concentrate collection device 10 connected in sequence.

[0028] The concentration tank 5 is used to hold liquid materials and provide a gas-liquid reaction space. The liquid materials can be liquid foods such as fruit and vegetable juices, dairy products, pre-made seasonings, and functional foods. This embodiment does not limit the scope of the liquid materials.

[0029] The air inlet 51 of the concentrator 5 is connected to the gas tank 1 via the gas delivery pipe 2. The gas delivered by the gas delivery pipe 2 is high-pressure gas. A primary precooling device 3 and a secondary precooling device 4 are sequentially installed on the gas delivery pipe 2 between the concentrator 5 and the gas tank 1 to precool the high-pressure gas. Specifically, the primary precooling device 3 is used to perform the first precooling of the gas flowing through the gas delivery pipe 2; the secondary precooling device 4 is used to perform a second precooling of the gas after the first precooling. The cavity of the concentrator 5 is equipped with a tertiary precooling material, which is used to perform a third precooling of the material inside the concentrator 5.

[0030] The concentration tank 5 is equipped with a stirring paddle 8, which is used to stir the material in the concentration tank 5 to promote gas-liquid reaction.

[0031] The concentrate collection device 10 is connected to the discharge port 53 of the concentration tank 5 and is used to collect the concentrate product.

[0032] In this embodiment, the gas used for the gas-liquid reaction can be CO2 or CH4, and gas tank 1 is used to store CO2 or CH4. During the multi-stage precooling process, after the first-stage precooling device 3 performs the initial precooling, the gas temperature can be reduced to 10-15℃. After the second-stage precooling device 4 performs the second precooling, the gas temperature can be reduced to 5-10℃. After the second precooled gas enters the cavity of the concentration tank 5, the tertiary precooling material installed in the cavity automatically senses and releases cold energy to lower the temperature, reducing the temperature inside the concentration tank 5 to the operating temperature range of 0-4℃. Gradient gas precooling achieves a better precooling effect, and the three-stage precooling provides a lower and more stable operating temperature.

[0033] Optionally, the concentration tank 5 includes an outer tank and an inner tank. The inner tank has an inner cavity for holding liquid materials and providing space for gas-liquid reaction. The inner tank is located inside the outer tank, and a refrigerant cavity is formed between the inner and outer tanks. The refrigerant cavity is connected to a refrigeration unit and is used for refrigerant flow to maintain the inner tank and the materials inside it at a low temperature.

[0034] Optionally, the concentration equipment may also include a gas collection device 11, which is connected to the exhaust port 52 of the concentration tank 5 to collect the gas after the hydrate decomposition.

[0035] The liquid food gas hydrate concentration equipment provided in this application embodiment uses a primary precooling device 3 and a secondary precooling device 4 installed on the gas supply pipe 2. The primary precooling device 3 is used to precool the gas flowing through the gas supply pipe 2 for the first time, and the secondary precooling device 4 is used to precool the gas after the first precooling. In addition, a special precooling material is installed in the cavity of the concentration tank 5 to achieve tertiary precooling. The multi-stage precooling gradually reduces the gas temperature to the working temperature, thereby effectively solving the problem of insufficient gas precooling efficiency, promoting the rapid formation of gas hydrate, and because the temperature change in the cavity of the concentration tank 5 is small after tertiary precooling, gas dissolution is prevented, resulting in higher gas utilization rate. It can also avoid the deterioration of the quality of the concentrate due to the dissolution of a large amount of gas and avoid the use of food neutralizers.

[0036] In an alternative embodiment, such as Figure 1 and Figure 3 As shown, the primary precooling device 3 includes a spiral coil 32 and a refrigerant tank 31; the spiral coil 32 is connected to the gas supply pipe 2 between the gas tank 1 and the secondary precooling device 4. The refrigerant tank 31 is used to house the spiral coil 32, and is cooled by a refrigeration unit to precool the gas flowing through the spiral coil 32 to a first preset temperature, such as 10-15°C. The spiral coil 32 is made of stainless steel.

[0037] In an alternative embodiment, such as Figure 1 As shown, the secondary precooling device 4 includes a semiconductor cooling chip, which is disposed outside the gas supply pipe 2 between the primary precooling device 3 and the concentration tank 5, and is used to precool the gas again to a second preset temperature, such as 5-10°C.

[0038] In an alternative embodiment, such as Figure 1 and Figure 2 As shown, the tertiary precooling material is a microcapsule phase change material 61 embedded in the outer wall of the porous distributor 6. The microcapsule phase change material 61 is a cold storage material capable of releasing cold energy to cool the high-temperature gas entering the inner tank of the concentration tank 5 during secondary precooling, so that the inner tank cavity quickly reaches the hydrate formation temperature, for example, 0-4°C, to avoid excessive gas dissolution affecting the quality of the concentrate. In other embodiments, the tertiary precooling material can also be a microcapsule phase change material 61 embedded in the inner wall of the cavity of the concentration tank 5.

[0039] This composite cooling mode, which combines rapid cooling by spiral coil 32 and precise temperature control by semiconductor refrigeration chip, utilizes the self-expansion of high-pressure gas to achieve a transient cooling of 3-5℃, followed by fine-tuning of 5-8℃ by semiconductor refrigeration chip. After entering the cavity of concentration tank 5, it is further cooled to the concentration temperature by microcapsule phase change material 61. The energy consumption is reduced by 40% compared with traditional compression refrigeration, and the working temperature is stable during concentration. Sufficiently pre-cooled gas reacts rapidly with liquid materials, reducing gas dissolution and improving the quality of the finished product.

[0040] In conventional concentration equipment, the gas-liquid contact area is small, the gas-liquid contact efficiency is low, and the mass transfer area of ​​conventional bubbling or static mixing methods is limited, resulting in a low hydrate formation rate. To solve this problem, in an optional embodiment, the concentration equipment further includes a gas-liquid enhancement device, which includes a porous distributor 6 and an ultrasonic transducer 7.

[0041] Combination Figure 1 and Figure 2 As can be seen, the porous distributor 6 is set in the cavity of the concentration tank 5 and is submerged in the liquid material in the cavity; the air inlet end of the porous distributor 6 is connected to the air inlet 51 of the concentration tank 5, and the porous distributor 6 is provided with a number of micro holes 64, which are used to allow gas to flow out and react with the liquid material to generate bubbles.

[0042] Optionally, the porous distributor 6 is provided with multi-level gradient microchannels 63 from bottom to top, and a number of micropores 64 are evenly distributed at the end, with a porosity of 25%-35%; the pore size of the multi-level gradient microchannels 63 decreases from 200 nanometers to 100 nanometers from bottom to top, and the porosity is also 25%-35%.

[0043] The ultrasonic transducer 7 is installed on the outer wall of the concentration tank 5. It promotes gas-liquid reaction through ultrasonic cavitation, promotes the formation of ice crystal nuclei from gas hydrates, and breaks the liquid film boundary layer through cavitation effect, thereby controlling the size of ice crystals.

[0044] In the specific ultrasonic process, the ultrasonic transducer 7 operates at a frequency of 28-100 kHz. It utilizes ultrasonic cavitation to generate localized high-pressure micro-regions, inducing instantaneous nucleation of hydrates and shortening the existence time of dissolved CO2. Experiments show that when a 40 kHz ultrasonic field is applied, the cavitation effect breaks down the liquid film boundary layer, reducing the CO2 mass transfer coefficient from 1.2 × 10⁻⁶ to 1.2 × 10⁻⁶. - 5 m / s increased to 6.8×10 -5 m / s (Test conditions: pressure 4MPa, temperature 1℃).

[0045] In this embodiment, after the gas enters the inner tank of the concentration tank 5, it flows to the porous distributor 6 and exits from the multi-level gradient micropores 64 on the porous distributor 6. It then rapidly contacts and reacts with the liquid material to form gas hydrates. Under the action of the ultrasonic transducer 7 and the multi-level gradient micropores 64, the gas flowing out of the micropores 64 can generate bubbles with a diameter of 50-200 μm, thereby increasing the gas-liquid contact area, allowing the gas to quickly participate in hydrate formation and reducing gas dissolution, further improving gas utilization and product quality.

[0046] In an alternative embodiment, such as Figure 1As shown, the gas-liquid enhancement device also includes a booster pump 12, which is installed on the gas delivery pipe 2 between the secondary precooling device 4 and the gas inlet 51 of the concentration tank 5. The booster pump 12 is used to pressurize the gas to a preset pressure value, such as 4MPa, and then pump it into the cavity of the concentration tank 5.

[0047] To address the increased costs and pollution caused by the direct emission of unreacted gases in conventional concentration equipment, in an optional embodiment, the liquid food gas hydrate concentration equipment further includes a waste cooling recovery unit 9. The recovery pipe of the waste cooling recovery unit 9 is connected between the outlet of the concentration tank 5 and the inlet 51 of the primary precooling device 3, and is used to return the decomposed hydrate gas and unreacted gases to the inlet 51 of the primary precooling device 3. Optionally, the recovery pipe is a finned tube.

[0048] In an alternative embodiment, such as Figure 4 As shown, the liquid food gas hydrate concentration equipment also includes a central control module 14 (not shown) and a monitoring module 13 electrically connected to the central control module 14, which together monitor and control the equipment's operating status. The monitoring module 13 includes a flow meter installed at the air inlet 51 of the concentration tank 5, and a temperature sensor, a pressure sensor, and a pH sensor located inside the cavity of the concentration tank 5. The flow meter monitors the air inlet flow rate; the temperature sensor detects the material temperature inside the cavity of the concentration tank 5; the pressure sensor detects the cavity pressure of the concentration tank 5; and the pH sensor monitors the acidity or alkalinity of the material inside the cavity of the concentration tank 5.

[0049] The central control module 14 is used to receive the monitoring parameters of the monitoring module 13, generate control signals, and transmit them to the corresponding components to realize the control of the concentration environment; the control signals include the air intake control signal, the precooling power control signal of each precooling device, and the air intake pressure control signal of the concentration tank 5.

[0050] In an optional embodiment, the concentration device further includes a human-machine interface module 15 (not shown); the human-machine interface module 15 receives detection parameters from the monitoring module 13 and generates data display. Optionally, the human-machine interface module 15 may include a touch screen for real-time observation of the temperature and pressure conditions of the concentration system, as well as the formation and decomposition of hydrates.

[0051] The following uses lychee concentrate as an example to illustrate its application.

[0052] CO2 gas entering the cavity without passing through the pre-cooling system causes the cavity temperature to rise by ≥12℃. The temperature rise inside the concentration tank 5 is too high, resulting in poor gas-liquid reaction, low gas hydrate formation efficiency, CO2 gas dissolving into the concentrate, affecting the quality of the finished product, and low gas utilization. The concentration process also consumes a lot of energy.

[0053] In this embodiment, based on the above embodiments of liquid material freezing and concentration equipment, the liquid material freezing and concentration equipment of this application is used, CO2 is used as the reaction gas, and the concentrate is lychee concentrate.

[0054] During the lychee juice concentration process, CO2 gas is first pre-cooled to 12-15°C by spiral coil 32, then pre-cooled a second time to 6-8°C by semiconductor refrigeration chip, and then pressurized to 4MPa by booster pump 12 before entering the inner cavity of concentration tank 5. At this time, microcapsule phase change material 61 automatically releases cold energy, causing the inner cavity temperature to drop to 1-3°C. After multi-stage pre-cooling, the CO2 gas enters the porous distributor 6 through the inlet 62, and then flows out through multi-stage micropores 64 to react with the liquid material and form bubbles. Under the action of porous distributor 6 and ultrasound (40kHz), the bubble diameter is controlled at 10-50μm, the inner cavity pressure is controlled at 4MPa, and the working temperature is controlled at 1°C. Under the condition of gas-liquid ratio of 22:10, the sugar content of lychee juice is increased from 11°Bx to 28°Bx.

[0055] In this lychee concentration process, the temperature rise of the CO2 gas, after multi-stage pre-cooling, within the concentration chamber was less than or equal to 1°C. The gas-liquid reaction was rapid, the gas hydrate formation efficiency was high, and the rapid reaction between CO2 gas and liquid lychee juice reduced CO2 dissolution. The resulting lychee concentrate had a better quality, a faster concentration process, and CO2 gas utilization increased by more than 30%.

[0056] During the concentration process, the temperature and pressure fluctuations within the chamber are controlled within 5% to meet the metastable requirements for the nucleation and growth of gas hydrates, promote hydrate formation, increase the formation rate by 3 times compared to traditional hydrate concentration, and reduce the amount of hydrates formed by 60%, thus avoiding acidification and deterioration of the concentrate.

[0057] Overall, the liquid material freezing and concentration equipment of this application can concentrate liquid foods such as lychee juice by more than 40% energy, increase gas utilization by more than 60%, and improve concentration efficiency by more than 20% compared with traditional equipment. It is suitable for green and efficient concentration of heat-sensitive liquid foods.

[0058] The liquid food gas hydrate concentration equipment provided in this application uses a primary precooling device to precool the gas flowing through the gas pipeline, a secondary precooling device to precool the gas after the first precooling, and a tertiary precooling material to reduce the temperature inside the concentration tank to the working temperature. This effectively solves the problem of insufficient gas precooling efficiency, promotes the rapid formation of gas hydrates, and, because the temperature change inside the concentration tank is less after the tertiary precooling, the gas utilization rate is higher. It also avoids the deterioration of the concentrate quality due to the dissolution of a large amount of gas and avoids the use of food neutralizers.

[0059] Furthermore, the dual action of the porous distributor and the ultrasonic transducer enhances gas-liquid contact, promotes rapid formation of gas hydrates, and improves gas utilization. At the same time, the rapid participation of gas in hydrate formation reduces dissolution, further improving gas utilization and helping to improve the quality of the finished product, thus avoiding the use of neutralizing agents.

[0060] Furthermore, a waste heat recovery unit is used to achieve closed-loop gas circulation, enabling efficient precooling and energy saving.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A liquid food gas hydrate concentration device, characterized in that, It includes a gas tank, a concentration tank, and a concentrate collection device connected in sequence; The concentration tank is used to hold liquid materials and provide space for gas-liquid reaction; The air inlet of the concentration tank is connected to the gas tank via a gas delivery pipe. A primary precooling device and a secondary precooling device are sequentially installed on the gas delivery pipe between the concentration tank and the gas tank. The primary precooling device is used to precool the gas flowing through the gas delivery pipe for the first time. The secondary precooling device is used to precool the gas after the first precooling for the second time. A tertiary precooling material is installed inside the cavity of the concentration tank, which is used to precool the material in the concentration tank for the third time. The concentration tank is equipped with a stirring paddle, which is used to stir the material in the concentration tank to promote gas-liquid reaction. The concentrate collection device is connected to the outlet of the concentration tank and is used to collect the finished concentrate.

2. The liquid food gas hydrate concentration equipment as described in claim 1, characterized in that, The primary precooling unit includes a spiral coil and a refrigerant box; The spiral coil is connected to the gas supply pipe between the gas tank and the secondary precooling device; The refrigerant box is used to house the spiral coil. The refrigerant box is cooled by a refrigeration unit and is used to pre-cool the gas flowing through the spiral coil to a first preset temperature.

3. The liquid food gas hydrate concentration equipment as described in claim 1, characterized in that, The secondary precooling device includes a semiconductor refrigeration chip, which is disposed on the outside of the gas delivery pipe between the primary precooling device and the concentration tank, and is used to precool the gas again to a second preset temperature.

4. The liquid food gas hydrate concentration equipment as described in claim 1, characterized in that, The concentration equipment also includes a gas-liquid enhancement device, which includes a porous distributor and an ultrasonic transducer. The porous distributor is disposed in the cavity of the concentration tank and is submerged in the liquid material in the cavity; The air inlet of the porous distributor is connected to the air inlet of the concentration tank. The porous distributor is provided with a number of micropores, which are used to allow gas to flow out and react with the liquid material to generate bubbles. The ultrasonic transducer is installed on the outer wall of the concentration tank. It promotes gas-liquid reaction through ultrasonic cavitation, promotes the formation of ice crystal nuclei from gas hydrates, and breaks the liquid film boundary layer through cavitation effect, thereby controlling the size of ice crystals.

5. The liquid food gas hydrate concentration equipment as described in claim 4, characterized in that, The porous distributor is provided with multi-level gradient microchannels from bottom to top, and its ends are uniformly distributed with a number of micropores with a porosity of 25%-35%. The aperture of the multi-level gradient microchannel decreases progressively from bottom to top.

6. The liquid food gas hydrate concentration equipment as described in claim 4, characterized in that, The gas-liquid enhancement device also includes a booster pump, which is installed on the gas delivery pipe between the secondary precooling device and the gas inlet of the concentration tank. The booster pump is used to pressurize the gas to a preset pressure value and pump it into the cavity of the concentration tank.

7. The liquid food gas hydrate concentration equipment as described in claim 4, characterized in that, The third-stage precooling material is a phase change material embedded in the outer wall of the porous distributor.

8. The liquid food gas hydrate concentration equipment as described in claim 1, characterized in that, The equipment also includes a waste heat recovery unit; The recovery pipe of the waste heat recovery unit is connected between the outlet of the concentration tank and the inlet of the primary precooling device, and is used to return the decomposed hydrate gas to the inlet of the primary precooling device; the recovery pipe is a finned tube.

9. The liquid food gas hydrate concentration equipment as described in claim 1, characterized in that, The device also includes a central control module and a monitoring module electrically connected to the central control module; The monitoring module includes a flow meter installed at the air inlet of the concentration tank, and a temperature sensor, a pressure sensor, and a pH sensor installed inside the cavity of the concentration tank. The flow meter is used to monitor the inlet air flow rate; the temperature sensor is used to detect the material temperature inside the cavity of the concentration tank; the pressure sensor is used to detect the cavity pressure of the concentration tank; and the pH sensor is used to detect the acidity or alkalinity of the material inside the cavity of the concentration tank. The central control module is used to receive the monitoring parameters of the monitoring module, generate control signals and transmit them to the corresponding components; the control signals include air intake control signals, precooling power control signals of each precooling device and air intake pressure control signals of the concentration tank.

10. The liquid food gas hydrate concentration equipment as described in claim 9, characterized in that, The concentration device also includes a human-machine interaction module; the human-machine interaction module receives the detection parameters from the monitoring module and generates data display.

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