Water treatment and gas purification equipment based on hydrate technology and operation method

Abstract

The water treatment and gas purification equipment based on the hydrate technology comprises a hydrate generation device, a temperature regulation and control device and a collection device, the hydrate generating device comprises a reaction cavity and a swinging device, the reaction cavity is provided with an inner cavity, the inner cavity is used for storing sewage, and high-pressure gas can be injected into the inner cavity to control the pressure in the inner cavity; the reaction cavity is connected with the output end of the swinging device, and the swinging device is used for driving the reaction cavity to swing; the temperature regulation and control device is connected with the reaction cavity and is used for controlling the temperature in the inner cavity so as to reach phase balance; the collecting device is communicated with the inner cavity and is used for respectively collecting sewage treatment residual liquid separated from sewage, gas separation residual gas and purified gas. The operation method comprises the steps that sewage and mixed gas are injected into the inner cavity, and the temperature and pressure in the inner cavity are adjusted to achieve phase balance; the reaction cavity swings, so that the hydrate grows along the inner wall of the inner cavity.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment, and in particular to a water treatment and gas purification device and an operating method based on hydrate technology. Background Art

[0002] As a new method of material separation and enrichment, hydrate technology has shown unique potential in the fields of sewage treatment and gas separation in recent years. However, traditional methods have significant defects in practical applications, mainly reflected in the three core contradictions of low generation efficiency, high energy consumption and difficult separation, which restricts its large-scale promotion. In the sewage treatment scenario, the sewage composition is complex, and impurities such as oil, suspended matter and high salinity are easily adsorbed on the hydrate surface, interfering with crystal nucleation and growth, resulting in a significant decrease in reaction rate. Traditional static reactors rely on natural mass transfer at the gas-liquid interface, and hydrates are generated slowly and unevenly distributed. Although the introduction of mechanical stirring can enhance mixing, it is easy to destroy the stability of the hydrate structure, and subsequent separation requires centrifugation or membrane filtration equipment, which is cumbersome and energy-intensive. In the field of gas separation, competitive adsorption of mixed gas components (such as CH4 / CO2, H2 / CO2, CH4 / H2S) leads to insufficient separation selectivity and low recovery rate of target gas. The preparation of high-purity products requires multi-stage reactors to be pressurized step by step, and the equipment complexity and operating costs have increased sharply.

[0003] In summary, existing technologies generally have defects such as the separation of the "generation-separation" link, imbalance between energy consumption and efficiency, and insufficient system reliability. There is a lack of integrated solutions that can simultaneously achieve efficient generation, targeted enrichment and immediate separation in a single reaction unit. Summary of the invention

[0004] The purpose of this application is to provide a water treatment and gas purification equipment and operation method based on hydrate technology, which has the advantages of improving hydrate generation efficiency, reducing energy consumption and realizing instant separation of sewage and gas.

[0005] An embodiment of the present application provides a water treatment and gas purification equipment based on hydrate technology, including a hydrate generating device, a temperature control device and a collecting device; the hydrate generating device includes a reaction chamber and a swinging device, the reaction chamber has an inner chamber, the inner chamber is used to store sewage, and high-pressure gas can be injected into the inner chamber to control the pressure in the inner chamber; the reaction chamber is connected to the output end of the swinging device, and the swinging device is used to drive the reaction chamber to swing; the temperature control device is connected to the reaction chamber, and the temperature control device is used to control the temperature in the inner chamber to reach phase equilibrium; the collecting device is connected to the inner chamber, and the collecting device is used to collect sewage treatment residual liquid, gas separation residual gas and purified gas separated from the sewage respectively.

[0006] In some embodiments, a gradient wettability coating is provided on the inner wall of the inner chamber.

[0007] In some embodiments, the gradient wettability coating comprises alternately distributed hydrophobic coatings and hydrophilic coatings.

[0008] In some embodiments, the hydrophobic coating is a polytetrafluoroethylene coating and the hydrophilic coating is a silica coating.

[0009] In some embodiments, hydrophilic channels are provided on the inner wall of the inner chamber to induce crystals to grow along the hydrophilic channels; and / or,

[0010] A pressure piston is provided in the inner chamber to supplement and pressurize the inner chamber.

[0011] In some embodiments, the reaction chamber further has a liquid channel, and the temperature control device includes a liquid temperature controller and a conduit. The liquid temperature controller is used to store a liquid and control the temperature of the liquid. The liquid temperature controller is connected to the liquid channel through the conduit, and the liquid in the liquid temperature controller can enter the liquid channel through the conduit to control the temperature in the inner chamber.

[0012] In some embodiments, a heat insulation structure is provided on the outer side of the reaction chamber.

[0013] In some embodiments, the collection device includes a first collection device, a second collection device, and a third collection device. The first collection device, the second collection device, and the third collection device are respectively connected to the inner chamber. The first collection device is used to collect the unreacted residual liquid flowing into it from the inner chamber and achieve gas-liquid separation by adjusting the internal pressure thereof; the second collection device is used to collect the unreacted residual gas flowing into it from the inner chamber and achieve separation of various gases by adjusting the internal pressure thereof; the third collection device is used to collect the purified gas flowing into it from the inner chamber and achieve separation of various purified gases by adjusting the internal pressure thereof.

[0014] In some embodiments, the first collection device, the second collection device, and the third collection device are all high-pressure piston collection tanks, and a high-pressure piston is provided in the high-pressure piston collection tank to change the internal pressure of the high-pressure piston collection tank; and / or,

[0015] The first collection device, the second collection device, and the third collection device are all connected to a gas chromatograph.

[0016] The present application provides an operation method based on the water treatment and gas purification equipment as described in any one of the above, including the following steps:

[0017] Inject sewage and mixed gas into the inner cavity, and adjust the temperature and pressure in the inner cavity to achieve phase equilibrium;

[0018] Swing the reaction cavity to cause hydrate to grow along the inner wall of the inner cavity;

[0019] Collect the sewage treatment residual liquid, gas separation residual gas and purified gas respectively through the collection device.

[0020] Compared with the prior art, a water treatment and gas purification device 100 and an operation method based on hydrate technology provided by the present application promote the growth of hydrate on the inner wall of the inner cavity through a reaction cavity that can swing at multiple angles, cooperate with temperature and pressure regulation to achieve efficient generation, and use the collection device to synchronously complete residual liquid separation and gas fractional purification, having the advantages of improving the reaction rate, reducing energy consumption and simplifying the separation process. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic plan view of the water treatment and gas purification device 100 according to an embodiment of the present application. Detailed Embodiments

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0025] It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] First, in the description of the embodiments of the present application, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application.

[0027] Secondly, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, without order or importance. They cannot be understood as indicating or implying relative importance. Features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0028] Furthermore, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined; the term "along a certain direction" does not mean that it is required to be absolutely parallel to that direction, but can have some deviation, that is, it only needs to have a component in that direction.

[0029] In addition, in the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, an electromagnetic connection, or even a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0030] In addition, "and / or" in the present application, such as "feature 1 and / or feature 2", refers to the three cases of "feature 1" alone, "feature 2" alone, and "feature 1" plus "feature 2". "and / or" in the present application, such as "feature 1 and / or feature 2", refers to the three cases of "feature 1" alone, "feature 2" alone, and "feature 1" plus "feature 2".

[0031] In the prior art, when hydrate technology is applied to sewage treatment and gas separation, there are generally problems such as low production efficiency, cumbersome separation processes, and high energy consumption. Traditional static reactors rely on natural mass transfer, resulting in slow and uneven hydrate formation. Although mechanical stirring can enhance mixing, it destroys the crystal structure stability. Subsequent separation relies on centrifugal or membrane filtration equipment, with complex processes and high energy consumption. Competitive adsorption of mixed gas components leads to insufficient separation selectivity. The preparation of high-purity products requires multi-stage reactors for step-by-step pressurization, significantly increasing equipment complexity and operating costs. The prior art cannot synchronously achieve efficient generation, directional enrichment, and instant separation in a single reaction unit.

[0032] To solve the above problems, the inventors observed the wall-climbing phenomenon at the solid-liquid interface during the hydrate formation process, that is, the hydrate grows upward along the solid surface. By regulating the wetting characteristics of the inner wall of the reaction cavity, the hydrate can be guided to grow directionally along a specific path to form a continuous mass transfer channel, thereby improving the production efficiency. At the same time, it was found that the multi-angle rotation mechanism can enhance the gas-liquid mixing effect and avoid the destruction of the crystal structure by mechanical stirring. Further integrating the temperature and pressure control systems can accurately match the thermodynamic conditions for different gas separations, and combining a physical pressure difference separation device to replace high-energy-consuming equipment, ultimately forming an integrated treatment solution.

[0033] As Figure 1 shown, the water treatment and gas purification equipment 100 based on hydrate technology according to an embodiment of the present application includes a hydrate generation device 10, a temperature control device 20, and a collection device 30; the hydrate generation device 10 includes a reaction cavity 11 and a swing device 12. The reaction cavity 11 has an inner cavity 11a for storing sewage, and high-pressure gas can be injected into the inner cavity 11a to control the pressure in the inner cavity 11a; the reaction cavity 11 is connected to the output end of the swing device 12, and the swing device 12 is used to drive the reaction cavity 11 to swing; the temperature control device 20 is connected to the reaction cavity 11, and the temperature control device 20 is used to control the temperature in the inner cavity 11a to reach phase equilibrium; the collection device 30 is communicated with the inner cavity 11a, and the collection device 30 is used to collect the sewage treatment residue, gas separation residue gas, and purified gas separated from the sewage respectively.

[0034] In some embodiments, a gradient wettability coating is provided on the inner wall of the inner cavity 11a to guide the directional growth of hydrates along the wall surface through wettability differences.

[0035] The present application further proposes that the gradient wettability coating includes alternately distributed hydrophobic coatings and hydrophilic coatings.

[0036] Among them, the hydrophobic coating refers to a material layer with the property of reducing surface energy. Specifically, the polytetrafluoroethylene spraying process can be used to achieve it, and by forming a low surface energy region, it promotes the preferential adsorption of gas molecules. The hydrophilic coating refers to a polar material layer with hydroxyl or silanol groups. Specifically, the sol-gel method can be used to prepare a silica coating to achieve it, and through surface hydrophilicity, it enhances the oriented arrangement of water molecules. The alternating distribution pattern means that the hydrophobic regions and hydrophilic regions are periodically arranged along the axial or circumferential direction of the cavity. Specifically, the screen printing technology can be used for zoned coating to achieve it, and by establishing a wettability gradient field, it controls the behavior of the three-phase interface.

[0037] Specifically, in the gas-liquid mixed system, the gas molecule clusters captured by the hydrophobic regions reduce the activation energy required for hydrate nucleation, and the hydrophilic regions fix water molecules through hydrogen bonding to form a lattice template. The alternating layout of the two coatings forms periodic surface energy potential wells at the solid-liquid interface, enabling the hydrate crystals to nucleate in the hydrophobic regions and then grow directionally along the hydrophilic regions. This ordered growth pattern avoids the random nucleation phenomenon caused by the traditional homogeneous surface, promotes the formation of a continuous layered structure of hydrates on the wall surface, and constructs a rapid mass transfer channel that penetrates the reaction cavity.

[0038] Compared with the prior art, the traditional single-wettability coating can only achieve a single function of gas adsorption or crystal attachment and cannot meet the dual requirements of nucleation and growth. Through the design of alternating wettability distribution, this solution realizes the functional separation of the gas enrichment region and the crystal growth region in the spatial dimension, enabling the nucleation process and the crystal expansion process to occur sequentially in specific regions and forming a self-organized directional growth mechanism.

[0039] Through the above technical solution, this application effectively solves the problems of random nucleation and disordered growth during the hydrate formation process and realizes the directional expansion of crystals along a predetermined path. The formation of the continuous hydrate film layer significantly improves the gas-liquid mass transfer efficiency and at the same time enhances the mechanical stability of the crystal structure, creating favorable conditions for subsequent separation operations.

[0040] The swing device 12 drives the reaction cavity 11 to perform periodic swinging, which can be specifically realized by an eccentric wheel mechanism cooperating with a servo motor, enhancing the gas-liquid contact area and promoting the epitaxial growth of crystals.

[0041] In some embodiments, hydrophilic channels are provided on the inner wall of the inner cavity 11a, enabling more sewage to adhere to the inner side wall of the inner cavity, inducing the crystals to climb along the hydrophilic channels to achieve directional growth, and at the same time facilitating collection and observation.

[0042] As Figure 1 shown, in some embodiments, the inner cavity 11a is provided with a pressure piston 13 to supplement the pressure inside the inner cavity 11a or to pressurize and discharge the liquid and / or gas inside the inner cavity 11a.

[0043] Among them, the pressure piston refers to a device that uses mechanical pressure to extrude the mixture in the reaction cavity, and specifically, a piston structure driven by hydraulic pressure or electric drive can be adopted to achieve this. This device applies linear pressure to force the residual liquid that has not formed hydrates to drain out from the gaps between the hydrate crystals, thereby completing the solid-liquid separation process in the inner cavity. In this solution, the role of the pressure piston is to replace traditional centrifugal or membrane filtration equipment, and directly achieve efficient separation in the inner cavity through physical extrusion, reducing equipment complexity and energy consumption.

[0044] Specifically, during the separation process of sewage and hydrate crystals, after the pressure piston is started, mechanical pressure is applied to the mixture in the reaction cavity. Since the hydrate crystals have a rigid structure and the residual liquid is in a fluid state, under the action of pressure, the residual liquid drains out from the crystal gaps and enters the residual liquid collection device through the filter screen or the diversion channel. During the extrusion process, the pressure can be dynamically adjusted according to the crystal production amount to ensure the separation efficiency while avoiding damage to the crystal structure. The entire separation process does not require transferring the material to external equipment and is directly completed in the reaction cavity, simplifying the operation process.

[0045] Compared with the prior art, the prior art mostly adopts centrifugal separation or membrane filtration methods, which require transferring the reaction mixture to a centrifuge or a membrane module for separation, increasing equipment costs and energy consumption. Centrifugal separation is prone to breaking the hydrate crystals, and membrane filtration has a risk of clogging. In contrast, the pressure piston 13 is integrated inside the reaction cavity, and solid-liquid separation is achieved through linear pressure, avoiding material transfer and equipment switching, while protecting the integrity of the crystals and reducing maintenance requirements.

[0046] Through the above technical solution, this application solves the problems of cumbersome process and high energy consumption caused by the traditional separation method relying on external equipment. It realizes efficient solid-liquid separation directly inside the reaction cavity, simplifies the system structure, reduces the operation complexity, avoids potential damage to the hydrate structure by centrifugation or membrane filtration, and improves the stability and reliability of the separation process.

[0047] As Figure 1 shown, in some embodiments, the reaction cavity 11 also has a liquid channel 11b. The temperature control device 20 includes a liquid temperature controller 21 and a conduit 22. The liquid temperature controller 21 is used to store liquid and control the temperature of the liquid. The liquid temperature controller 21 is connected to the liquid channel 11b through the conduit 22. The liquid in the liquid temperature controller 21 can enter the liquid channel 11b through the conduit 22 to control the temperature in the inner cavity 11a.

[0048] In some embodiments, the liquid temperature controller 21 is a constant temperature water bath, and the conduit 22 is a circulation pipeline.

[0049] In some embodiments, the temperature control device 20 further includes a temperature sensor disposed in the reaction chamber 11 to monitor the temperature of the inner chamber 11a and then perform regulation.

[0050] Through the above technical solution, the present application realizes precise dynamic regulation of the temperature in the inner chamber, eliminates the local overcooling or overheating phenomenon caused by the temperature gradient in the traditional method, shortens the induction period of the hydrate formation process, increases the crystal growth rate, and at the same time avoids ineffective heat energy loss. In the gas decomposition stage, by precisely controlling the temperature step change, selective decomposition of different gas hydrates is realized, and the recovery purity of the target gas is improved.

[0051] In some embodiments, a heat insulation structure is provided on the outer side of the reaction chamber 11 to avoid a large influence of the external temperature on the temperature of the inner chamber 11a.

[0052] As Figure 1 shown, in some embodiments, the collection device 30 includes a first collection device 31, a second collection device 32, and a third collection device 33. The first collection device 31, the second collection device 32, and the third collection device 33 are respectively communicated with the inner chamber 11a. The first collection device 31 is used to collect the unreacted residual liquid flowing into it from the inner chamber 11a and achieve gas-liquid separation by adjusting the internal pressure thereof; the second collection device 32 is used to collect the unreacted residual gas flowing into it from the inner chamber 11a and achieve separation of various gases by adjusting the internal pressure thereof; the third collection device 33 is used to collect the purified gas flowing into it from the inner chamber 11a and achieve separation of various purified gases by adjusting the internal pressure thereof.

[0053] As Figure 1 shown, in some embodiments, the first collection device 31, the second collection device 32, and the third collection device 33 are all high-pressure piston collection tanks. A high-pressure piston is disposed inside the high-pressure piston collection tank to be used for changing the internal pressure of the high-pressure piston collection tank;

[0054] Specifically, the residual liquid discharged from the inner chamber enters the first collection device 31 through a diversion pipeline, and the built-in filtering structure therein realizes solid-liquid separation; the residual gas discharged from the top of the inner chamber enters the second collection device 32 under the drive of the pressure difference, and the check valve prevents gas backflow; when the system pressure is reduced in stages, the purified gases generated by the sequential decomposition of different gas hydrates respectively enter the corresponding third collection device 33. The three devices are connected through independent pipelines and equipped with isolation valves to achieve physical isolation collection of the products.

[0055] In some specific embodiments, a conical precipitation area may be provided at the bottom of the first collection device 31, and an ultrasonic vibrator may be installed on the side wall to accelerate solid-liquid separation. The air pump of the second collection device 32 may have a frequency conversion function and dynamically adjust the air extraction rate according to the data of the pressure sensor. The pressure control valve of the third collection device 33 may be linked with the temperature control system to ensure that the decomposition pressure and temperature conditions are precisely matched.

[0056] Compared with the prior art, the traditional system uses a single collection container, resulting in the mixing of unreacted substances and target products, and additional centrifugal separation or membrane filtration processes are required. In this solution, the liquid-phase and gas-phase products are instantaneously collected by a split-type collection device, avoiding product cross-contamination. At the same time, continuous purification of gas components is achieved through pressure grading control, reducing subsequent processing steps.

[0057] Through the above technical solutions, the present application solves the problem of product mixing caused by the single function of the traditional collection device. The unreacted residual liquid and the purified gas after decomposition are independently collected, avoiding the mixing of impurities into the target product. When collecting different purified gases in stages, the pressure control valve precisely matches the decomposition conditions of each gas, ensuring that high-purity gas directly enters the special storage tank without secondary separation operations. The residual gas collection device maintains the pressure balance of the system and prevents residual gas from interfering with the hydrate decomposition process.

[0058] As Figure 1 shown, the first collection device 31, the second collection device 32, and the third collection device 33 are all connected to a gas chromatograph 40 to detect the gas components.

[0059] Compared with the prior art, the traditional method requires transferring gas samples to an independent laboratory for off-line detection, and the detection cycle is as long as several hours, and it is impossible to timely feedback and adjust the pressure parameters. Most of the on-line detection devices recorded in the existing literature use infrared sensors, but there is a problem of insufficient component recognition accuracy due to cross-sensitivity. This solution realizes synchronous detection of multiple components through chromatographic separation technology, can accurately identify the concentration changes of CH4 and CO2, and controls the detection delay time within 3 minutes.

[0060] The present application provides an operation method based on the water treatment and gas purification equipment 100 as described above, including the following steps:

[0061] Inject sewage and mixed gas into the inner cavity 11a, and adjust the temperature and pressure in the inner cavity 11a to reach phase equilibrium;

[0062] Make the reaction cavity 11 swing so that the hydrate grows along the inner wall of the inner cavity 11a;

[0063] Collect the sewage treatment residual liquid, gas separation residual gas, and purified gas through the collection device respectively.

[0064] Among them, adjusting the temperature and pressure of the inner chamber refers to controlling the reaction environment within a specific phase range through a heating / cooling device and a pressurizing / depressurizing device. Specifically, it can be achieved by using a temperature control device and an axial pressure pump to control the linkage. This operation constructs the thermodynamic equilibrium conditions required for hydrate nucleation. Making the reaction chamber swing refers to making the chamber swing back and forth through a swing device. Specifically, it can be achieved by using an eccentric wheel mechanism in conjunction with a servo motor. This action enhances the dynamic contact efficiency of the gas-liquid-solid three-phase interface. The pressurizing piston refers to a device that uses physical extrusion to achieve solid-liquid separation. Specifically, it can be achieved in conjunction with a filter mesh structure. This design avoids the shear damage to the crystal structure caused by traditional centrifugal separation. Adjusting the pressure so that hydrates of different gases decompose in sequence refers to performing a gradient pressure reduction operation according to the differences in the phase equilibrium curves of each gas hydrate. Specifically, it can be achieved by using a multi-stage back pressure pump in conjunction with a pressure sensor. This process achieves the selective release of different gas components.

[0065] Compared with the prior art, the present application provides a water treatment and gas purification equipment 100 and an operating method based on hydrate technology, which promotes the growth of hydrates on the inner wall of the inner chamber 11a through a reaction chamber 11 that can swing at multiple angles, realizes efficient generation through temperature and pressure control, and uses a collection device to simultaneously complete residual liquid separation and gas graded purification, which has the advantages of increasing reaction rate, reducing energy consumption and simplifying the separation process.

[0066] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it, but it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made within the scope recorded in this application still fall within the scope covered by this application.

Claims

1. A water treatment and gas purification device based on hydrate technology, characterized in that, It includes a hydrate formation device, a temperature control device and a collection device; the hydrate formation device includes a reaction cavity and a swinging device, the reaction cavity has an inner cavity for storing sewage, and high-pressure gas can be injected into the inner cavity to control the pressure in the inner cavity; the reaction cavity is connected to the output end of the swinging device, and the swinging device is used to drive the reaction cavity to swing; the temperature control device is connected to the reaction cavity, and the temperature control device is used to control the temperature in the inner cavity to reach phase equilibrium; the collection device is communicated with the inner cavity body, and the collection device is used to respectively collect the sewage treatment residual liquid, gas separation residual gas and purified gas separated from the sewage.

2. The water treatment and gas purification equipment according to claim 1, characterized in that A gradient wettability coating is provided on the inner wall of the inner cavity.

3. The water treatment and gas purification equipment according to claim 2, characterized in that, The gradient wettability coating includes alternately distributed hydrophobic coatings and hydrophilic coatings.

4. The water treatment and gas purification equipment according to claim 3, characterized in that, The hydrophobic coating is a polytetrafluoroethylene coating, and the hydrophilic coating is a silica coating.

5. The water treatment and gas purification equipment according to claim 1, characterized in that, Hydrophilic channels are provided on the inner wall of the inner cavity to induce crystals to grow along the hydrophilic channels; and / or, A pressure piston is provided in the inner cavity to pressurize the inner cavity.

6. The water treatment and gas purification equipment according to claim 1, characterized in that, The reaction cavity also has a liquid channel, the temperature control device includes a liquid temperature controller and a conduit, the liquid temperature controller is used to store liquid and control the temperature of the liquid, the liquid temperature controller is communicated with the liquid channel through the conduit, and the liquid in the liquid temperature controller can enter the liquid channel through the conduit to control the temperature in the inner cavity.

7. The water treatment and gas purification equipment according to claim 6, characterized in that, A heat preservation structure is provided on the outside of the reaction cavity.

8. The water treatment and gas purification equipment according to claim 1, characterized in that, The collection device includes a first collection device, a second collection device and a third collection device. The first collection device, the second collection device and the third collection device are respectively communicated with the inner cavity. The first collection device is used to collect the residual liquid flowing into it from the inner cavity and realize gas-liquid separation by adjusting the internal pressure thereof; the second collection device is used to collect the unreacted residual gas flowing into it from the inner cavity and realize the separation of various gases by adjusting the internal pressure thereof; the third collection device is used to collect the purified gas flowing into it from the inner cavity and realize the separation of various purified gases by adjusting the internal pressure thereof.

9. The water treatment and gas purification equipment according to claim 1, wherein The first collection device, the second collection device and the third collection device are all high-pressure piston collection tanks, and a high-pressure piston is provided inside the high-pressure piston collection tank to change the internal pressure of the high-pressure piston collection tank; and / or, The first collection device, the second collection device and the third collection device are all connected to a gas chromatograph.

10. A method for operating a water treatment and gas purification device according to any one of claims 1-9, characterized in that, It includes the following steps: Inject sewage and mixed gas into the inner cavity, and adjust the temperature and pressure in the inner cavity to reach phase equilibrium; Make the reaction cavity swing so that hydrates grow along the inner wall of the inner cavity; Respectively collect the sewage treatment residual liquid, gas separation residual gas and purified gas through the collection device.

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