System for performing gas hydration separation by using natural cold energy and working method thereof

Abstract

The invention relates to a system for performing gas hydration separation by using natural cold energy and a working method thereof, and relates to the field of gas purification. Comprising a cold energy storage pool provided with a coil pipe and a solution, a natural cold energy collector used for collecting natural cold energy in winter, a heat exchanger used for heating a secondary refrigerant, a gas storage tank used for storing gas, a visible reaction kettle used for conducting gas hydration separation and a water injection device used for injecting liquid into the visible reaction kettle. The natural cold energy collector collects external cold energy through a secondary refrigerant, and the secondary refrigerant exchanges heat with the solution through the coil pipe so as to store the cold energy; a secondary refrigerant carrying cold energy flows through the heat exchanger to be heated to a limited temperature and then enters the visible reaction kettle; the gas storage tank and the water injection device inject impure gas and water into the visible reaction kettle for hydration separation. The device has the advantages that natural cold energy can be collected and utilized, and electric energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas purification, and in particular to a system for gas hydration separation using natural cold energy and a working method thereof. Background Art

[0002] Coal mine gas (mainly methane) is the main associated gas in coal mine production. It is flammable and explosive, and is one of the main sources of danger threatening coal mine production safety. It is also a clean energy source and a greenhouse gas. At present, coal mine gas is directly discharged in large quantities, seriously polluting the atmospheric environment and wasting natural gas energy. The main reason is that impurity gases such as nitrogen and oxygen are mixed in during the gas extraction process, reducing the methane concentration and making it unusable. Based on this, effective separation and recovery of coal mine gas can not only reduce the safety risks of coal mine production, but also achieve efficient utilization of resources, energy conservation and emission reduction.

[0003] Hydrate separation technology has been widely studied as a mixed gas separation method with good application prospects. This technology realizes the selective separation of methane, nitrogen, oxygen and other components in coalbed methane by utilizing the temperature and pressure differences of different gases to form hydrates, and has the advantages of large gas storage capacity, mild operating conditions and recovery. Gas hydrate is a cage-shaped inclusion compound formed by water and gases such as methane under low temperature and high pressure conditions. Its formation process must always be carried out in a low temperature environment. This link is often the most energy-consuming part of the gas separation process. However, in the traditional gas hydration separation and purification process, in order to achieve low temperature conditions, pure electricity is usually used for supply. Although it can provide the required low temperature environment, it has high energy consumption, complex equipment and high operating costs.

[0004] Heilongjiang Province is located in northeast China, between 43°26′ and 53°33′ north latitude. It has a cold climate and a long winter (usually from November to March of the following year). The temperature is often between -10°C and -30°C, which has significant natural cold energy advantages. At present, the low-temperature environment for coal mine gas separation mainly relies on electricity, and the method and technology of using natural cold energy to supply the low-temperature environment required for gas hydration separation is still blank.

[0005] Therefore, in view of the above shortcomings, it is necessary to provide a system and a working method for gas hydration separation using natural cold energy. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The technical problem to be solved by the present invention is to solve the problem that natural cold energy has not yet been used to hydrate, separate and purify gas.

[0008] (II) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a system for gas hydration separation using natural cold energy, including a cold energy storage tank arranged with coils and solutions, a natural cold energy collector for collecting natural cold energy in winter, a heat exchanger for heating a coolant, a gas storage tank for storing gas, a visible reactor for gas hydration separation, and a water injection device for injecting liquid into the visible reactor. The natural cold energy collector collects external cold energy through a coolant, and the coolant flows through the coils to exchange heat with the solution to store cold energy; the coolant carrying cold energy flows through the heat exchanger and is heated to a specified temperature and then enters the visible reactor; the gas storage tank and the water injection device respectively inject impure gas and water into the visible reactor for hydration separation.

[0010] As a further illustration of the present invention, preferably, the solution is sodium chloride ice salt, which has a melting temperature of -3.1°C.

[0011] As a further illustration of the present invention, preferably, a plurality of fans are provided in the natural cooling energy collector to enhance heat exchange with the coolant.

[0012] As a further illustration of the present invention, preferably, an air compressor is connected to the outside of the gas storage tank to fill the impure gas into the visual reactor; a circulation pump is provided outside the visual reactor to circulate the gas in the visual reactor into and out of the visual reactor.

[0013] As a further illustration of the present invention, preferably, the visual reactor is covered with a temperature control box to keep the visual reactor warm, a motor is arranged outside the visual reactor, a rotor is arranged inside the visual reactor, and the motor is rotatably connected to the rotor.

[0014] As a further illustration of the present invention, preferably, a gas collecting bottle and a residual gas bottle are respectively connected to the outside of the output end of the visual reactor. After the hydration reaction of the gas in the visual reactor is completed, the remaining gas is introduced into the residual gas bottle. After it is completely discharged, the visual reactor is heated to introduce the gas produced by the hydrate into the gas collecting bottle.

[0015] As a further illustration of the present invention, preferably, a gas chromatograph is provided outside the visual reaction kettle to perform gas chromatography detection on the gas in the visual reaction kettle.

[0016] The present invention also provides a method for operating a gas hydration separation system using natural cold energy, comprising the following steps:

[0017] Ⅰ. When the external ambient temperature gradually drops to less than the minimum temperature required in the gas hydration separation process after phase equilibrium calculation, the natural cold energy collector is started to allow the coolant in the pipeline to exchange heat with the external cold air, and the coolant carrying cold energy flows into the coil to exchange heat with the solution, and the solution solidifies to store cold energy;

[0018] Ⅱ. Part of the brine flows to the heat exchanger, and after the brine is heated to a preset temperature, the brine is introduced to the outside of the visual reactor to exchange heat with the environment inside the visual reactor;

[0019] Ⅲ. Start the water injection device to inject water into the visual reactor, and then start the motor to make the rotor stir the water in the visual reactor;

[0020] IV. When the coolant lowers the temperature in the visual reactor to the initial temperature of the hydration reaction, the air compressor is turned on to pump the gas in the gas storage tank into the visual reactor to allow the gas in the gas to react with water for hydration;

[0021] Ⅴ. When the pressure in the visual reactor is stable, the gas in the visual reactor is pumped into the residual gas bottle. After the pumping is completed, the supply of coolant to the visual reactor is stopped and the visual reactor is heated, and the gas generated by the decomposition of the hydrate is pumped into the gas collecting bottle.

[0022] As a further illustration of the present invention, preferably, when the external ambient temperature is high, the natural cold energy collector is turned off, the refrigerant exchanges heat with the solution through the coil, and then flows to the heat exchanger for heating to obtain the temperature required for the hydration reaction; when the cold energy of the solution is completely released, electric energy refrigeration is used to obtain the temperature required for the hydration reaction.

[0023] As a further illustration of the present invention, preferably, before the gas is pumped into the gas storage tank, 0.5-0.8 MPa of nitrogen is filled into the pipeline and the visual reactor and a leak test is performed to check the air tightness.

[0024] (III) Beneficial effects

[0025] The above technical solution of the present invention has the following advantages:

[0026] 1. The present invention can realize the collection, storage and utilization of cold energy in the process of coal mine gas hydration separation by circulating a coolant in an outdoor pipeline when the temperature is close to the thermodynamic condition required for gas hydration separation in winter.

[0027] 2. The present invention uses a coolant to collect cold energy, and can simultaneously realize direct utilization of cold energy in the coal mine gas hydration separation process and storage of surplus cold energy. The stored cold energy can be utilized in the coal mine gas hydration separation process in summer.

[0028] 3. The present invention can control the temperature of the collected and stored natural cold energy through a temperature control system, and then use the circulation of the coolant to achieve the transmission of cold energy at the required temperature, thereby meeting the thermodynamic conditions required for the gas in the reactor to form solid gas hydrates.

[0029] 4. The present invention uses a heat storage heat exchanger in the process of regulating the temperature of the coolant. Since the temperature range of the coolant collected by the cold energy collector is close to the temperature conditions required for the coal mine gas hydration separation process, the power demand of the heat exchanger in actual operation is relatively low, thereby achieving minimal consumption of electrical energy and promoting energy conservation and efficient utilization to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of the present invention.

[0031] In the figure: 1. cold energy storage tank; 2. natural cold energy collector; 21. fan; 22. coolant replenishing pump; 3. coil; 4. solution; 5. heat exchanger; 6. gas storage tank; 61. air compressor; 62. circulation pump; 7. water injection device; 8. visual reactor; 81. temperature control box; 82. motor; 83. rotor; 84. gas collecting bottle; 85. residual gas bottle; 9. central controller; 91. data acquisition device; 92. gas chromatograph; 93. temperature sensor; 94. circulation pressure sensor. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] A system for gas hydration separation using natural cold energy, such as Figure 1 As shown, it includes a cold energy storage tank 1, a natural cold energy collector 2, a coil 3, a solution 4, a heat exchanger 5, a gas storage tank 6, a water injection device 7, a visual reactor 8 and a central controller 9. The natural cold energy collector 2 is connected to the heat exchanger 5 through a pipe and a valve, and the coil 3 and the solution 4 are both located in the cold energy storage tank 1, and the solution 4 overflows the coil 3. The heat exchanger 5 is connected to the cold energy storage tank 1 through a pipe and a valve to transfer the cold energy of the cold energy storage tank 1 to the heat exchanger 5, and the output end of the heat exchanger 5 is connected to the visual reactor 8 through a pipe and a valve. The gas storage tank 6 containing impure gas is connected to the visual reactor 8 through a pipe and a valve, the water injection device 7 is connected to the visual reactor 8 through a pipe and a valve, and the central controller 9 is electrically connected to each valve.

[0034] like Figure 1As shown, solution 4 is sodium chloride ice salt; different mass fractions of sodium chloride and ice (%) have different melting temperatures and different unit refrigeration capacities (KJ / Kg); usually 5% sodium chloride and ice have a melting temperature of -3.1°C, and 1Kg of sodium chloride ice salt can produce 314.3KJ of cooling capacity. The cooling capacity per unit volume of ice is composed of the sensible heat of ice heating, the latent heat of ice melting, and the sensible heat of water heating, which can be calculated by the following formula:

[0035] Q i =C s (T t -T m )+Q q +C1(T3-T t )

[0036] in:

[0037] Q i is the cooling capacity per unit volume of ice, in kW;

[0038] C s is the specific heat of ice, take 2.09 kJ / (kg·℃);

[0039] T t is the phase transition temperature of ice, which is 0°C;

[0040] T m is the average temperature of ice crystals, taken as -6°C;

[0041] Q q is the latent heat of melting of ice, take 335 kJ (kg·℃);

[0042] T3 is the outlet water temperature after low-temperature water absorbs heat, which is 15℃.

[0043] Q can be calculated by the above formula i The cold energy storage tank 1 designed by the present invention has a volume of about 100m 3 , the cold storage capacity can reach 43039kJ, which can meet the cold capacity required for the hydration reaction.

[0044] like Figure 1As shown, a plurality of fans 21 are installed on the natural cooling energy collector 2. The fans 21 are provided to draw the outside air in winter into the natural cooling energy collector 2 to improve the heat exchange efficiency between the cold air and the refrigerant. The natural cooling energy collector 2 is located outside the heat exchanger 5 and is connected in parallel with a refrigerant replenishing pump 22. The refrigerant replenishing pump 22 is connected to the coil 3 through a pipe and a valve to replenish the refrigerant into the pipe. The heat exchanger 5 is a heat storage heat exchanger, which is provided with a solid filler inside to store heat. Generally, a fire grid, also known as a grate, is used. When the refrigerant flows through the heat exchanger 5, the refrigerant is heated by the heat stored in the solid filler.

[0045] like Figure 1 As shown, the output end of the gas storage tank 6 is connected to an air compressor 61 through a pipeline and a valve to pump the gas in the tank into the visual reactor 8. The visual reactor 8 is connected to a circulation pump 62 through a pipeline and a valve to extract the gas in the visual reactor 8 and pump it into the visual reactor 8. The visual reactor 8 is covered with a temperature control box 81 to provide a stable temperature space for the visual reactor 8. A motor 82 is fixedly connected to the visual reactor 8, and a rotor 83 with a stirring rod is rotatably connected to the output end of the motor 82, and the rotor 83 extends into the visual reactor 8. The output end of the visual reactor 8 is respectively connected to a gas collecting bottle 84 and a residual gas bottle 85 through a pipeline and a valve to collect the gas and residual gas generated by the hydrate respectively.

[0046] like Figure 1 As shown, the central controller 9 is electrically connected to a data acquisition device 91, and the data acquisition device 91 is electrically connected to the sensors in the natural cold energy collector 2, the heat exchanger 5, the visual reactor 8 and the temperature control box 81 to collect the operation status of each device. The visual reactor 8 is externally connected to a gas chromatograph 92 to analyze the gas composition and realize real-time monitoring. A temperature sensor 93 is connected to the pipeline between the water injection device 7 and the visual reactor 8 to monitor the temperature of the water flowing out of the water injection device 7. A circulation pressure sensor 94 is connected to the pipeline between the circulation pump 62 and the visual reactor 8 to collect the pressure of the circulating gas in the visual reactor 8 during the hydration reaction. The gas chromatograph 92, the temperature sensor 93 and the circulation pressure sensor 94 are all electrically connected to the data acquisition device 91.

[0047] The present invention also provides a method for operating a gas hydration separation system using natural cold energy, comprising the following steps:

[0048] Ⅰ. When the external ambient temperature gradually drops to less than the minimum temperature required in the gas hydration separation process after phase equilibrium calculation, the natural cold energy collector 2 and the fan 21 are started to exchange heat between the refrigerant in the pipeline and the external cold air, and the refrigerant carrying cold energy flows into the coil 3 to exchange heat with the solution 4, and the solution 4 solidifies to store cold energy. The refrigerant after heat exchange passes through the valve and the refrigerant replenishing pump 22, and re-enters the natural cold energy collector 2 for gas hydration separation to circulate and make ice. The refrigerant continuously exchanges heat with the solution 4 outside the coil 3, and the cold energy is accumulated to realize the collection of the natural cold energy required for gas hydration separation.

[0049] Ⅱ. Before the hydration reaction, the visual reactor 8 is checked for air tightness, as follows: Turn on the air compressor 61, fill the visual reactor 8 with nitrogen at about 0.5-0.8MPa, the gas in the gas storage tank 6 enters the visual reactor 8 through the pipeline through the air inlet valve, close the valve, and apply foam to the joints such as the pipe valve and the kettle cover for leak detection. If no bubbles are generated and no pressure drop occurs for a certain period of time, it means that the air tightness is good. After the air tightness test is qualified; turn on the air compressor 61, open the valve, the gas in the gas storage tank 6 enters the visual reactor 8 through the pipeline through the air inlet valve, fill it with the preset pressure value of the experiment, close the valve, open the exhaust valve, and empty the gas in the visual reactor 8. Repeat the steps three times to avoid additional impurity gases in the visual reactor 8.

[0050] When the external ambient temperature gradually drops to a temperature lower than the minimum temperature required in the gas hydration separation process after the phase equilibrium calculation, the refrigerant exchanges heat with the cold air in winter through the natural cold energy collector 2 used for gas hydration separation. After the heat exchange, the refrigerant temperature is monitored in real time and fed back to the central controller 9; according to the preset temperature value, the central controller 9 controls the heating power and flow of the heat exchanger 5, provides a controllable refrigerant and mixes it with the refrigerant after heat exchange. When the temperature of the mixed refrigerant meets the set requirements, the refrigerant flows to the constant temperature water bath pipe of the visible reactor 8 shell.

[0051] When the external temperature is high and cannot meet the temperature required for gas hydration separation after phase equilibrium calculation, the refrigerant passes through the valve into the cold energy storage pool 1 for gas hydration separation, exchanges heat with the ice outside the heat exchange coil 3, and flows to the heat exchanger 5 after heat exchange, and the refrigerant temperature is monitored in real time and fed back to the central controller 9. According to the preset temperature value, the central controller 9 controls the heating power and flow of the heat exchanger 5, provides controllable refrigerant and mixes it with the refrigerant after heat exchange, and when the temperature of the mixed refrigerant meets the setting requirements, the refrigerant flows to the constant temperature water bath pipe of the shell of the visible reactor 8.

[0052] When the outside temperature is high in summer, the natural cold energy collected by the circulating coolant cannot meet the cold energy required for gas hydration separation, and the cold energy stored in the cold energy storage tank 1 for gas hydration separation begins to be released, and the natural cold energy collector 2 is turned off. According to the preset temperature value, the central controller 9 controls the heating power and flow of the heat exchanger 5, provides controllable coolant and mixes it with the coolant in the cold energy storage tank 1. When the temperature of the mixed coolant meets the setting requirements, the coolant flows to the constant temperature water bath pipe of the shell of the visible reactor 8.

[0053] When the outside temperature is high in summer, after all the cold energy stored in the cold energy storage tank 1 used for gas hydration separation is released, the temperature supply depends on electric energy; turn off the natural cold energy collector 2 and the cold energy storage tank 1, start the refrigeration function of the temperature control box 81, and according to the preset temperature value, the temperature control box 81 is used to adjust the temperature inside the visual reactor 8 and provide a thermal insulation environment for the visual reactor 8 when non-electric refrigeration is used.

[0054] III. Start the water injection device 7 to inject water into the visual reactor 8, then start the motor 82 to make the rotor 83 stir the water in the visual reactor 8. When the coolant lowers the temperature in the visual reactor 8 to the initial temperature of the hydration reaction, start the air compressor 61 to pump the gas in the gas storage tank 6 into the visual reactor 8, so that the gas in the gas reacts with the water. When the gas pressure reaches the set separation pressure, turn off the air compressor 61; in order to avoid the reactor temperature rising during the intake process, the intake should be slow.

[0055] Start the data acquisition and recording function to monitor and record the changes in temperature and pressure during the experiment; turn on the gas circulation pump 62 to allow the gas to circulate in the circulation system composed of the gas circulation pump 62 and the visual reactor 8, and the low-temperature water contacts the gas. At this time, the pressure in the visual reactor 8 changes. The data is transmitted to the data collector 91 through a wire by the circulation pressure sensor 94, and the data collector 91 feeds back to the central controller 9. When the pressure data transmitted by the circulation pressure sensor 94 remains basically unchanged, it indicates that the reaction system has reached a state of equilibrium and the hydration separation reaction is completed.

[0056] IV. During the reaction process of forming gas hydrate, the central controller 9 controls the opening of the detection valve every 10 minutes, so that the remaining gas in the visual reactor 8 enters the gas chromatograph 92, and the concentration of methane in the remaining gas is monitored by the gas chromatograph 92. The data acquisition device 91 is provided with phase equilibrium calculation software, and the required temperature can be calculated by the phase equilibrium calculation software according to the preset pressure. The temperature value is fed back to the central controller 9, and the central controller 9 controls the speed of the fan 21 in the natural cold energy collector 2 of the gas hydration separation and the heating power and flow of the heat exchanger 5, thereby providing the temperature required for gas hydration separation.

[0057] V. When the pressure in the visual reactor 8 stops changing and becomes stable, the remaining gas is discharged into the residual gas bottle 85, and the central controller 9 controls the coolant to stop flowing into the constant temperature water bath pipe of the visual reactor 8, and no longer supplies cold. Then, the external power supply of the visual reactor 8 is connected, and the temperature in the visual reactor 8 is raised by pure electric heating until the gas hydrate is completely decomposed. The decomposed gas enters the gas chromatograph 92 for detection, and is transported to the gas collection bottle 84 after the detection meets the concentration requirements.

[0058] In summary, the present invention utilizes the phase equilibrium law of gas hydrate formation and imports the phase equilibrium law into the system of the central controller 9. The system tests and obtains coal mine gas with different concentration components, imports it into the central controller 9, and searches for the corresponding hydrate phase equilibrium curve, thereby optimizing the optimal thermodynamic temperature and pressure conditions for gas hydrate separation, carrying out separation operation, and realizing fully automatic and flexible adjustment, which can not only improve the gas purification efficiency, but also reduce the energy consumption cost by taking advantage of the unique cold environment in Heilongjiang Province.

[0059] Based on the total annual gas extraction in the country and the average gas extraction volume in each province, the cost saved by the use of natural cold energy utilization and control devices suitable for cold-region coal mine gas hydration separation and purification in Heilongjiang Province is estimated. According to data released by the National Development and Reform Commission, the total gas extraction in my country in 2020 was 12.8 billion cubic meters. If evenly distributed to 23 provinces and 5 autonomous regions, the annual gas extraction volume in each province would be approximately 457 million cubic meters. Therefore, the total annual gas extraction in Heilongjiang Province is 457 million cubic meters. According to data released by the National Development and Reform Commission, the total number of existing mines in Heilongjiang Province is 943, which translates to a daily extraction volume of approximately 1,327.7m 3 / Mine. Under certain temperature and pressure conditions, carry out separation and recovery of mixed gas with methane concentration ≤30%, or ≤8%, and use general equipment to process the extracted gas. Assuming the volume of the reactor is 1m 3 In order to speed up the gas hydration reaction rate, a promoter is often added to speed up the reaction. If the gas hydration separation time is 60 minutes, one device can process 24m3 in one day. 3 of gas, if we want to process 1327.7m 3Gas, about 56 devices are needed. The gas hydration separation process needs to provide temperature continuously, so the refrigeration equipment needs to operate for 1 hour. The refrigeration equipment uses a constant temperature air bath device with an equipment power of 4KW. The natural cold energy utilization control device suitable for cold-region coal mine gas hydration separation and purification has a power of 2KW and a daily power consumption of 48KW / h. The electric energy saved by using the natural cold energy utilization control device suitable for cold-region coal mine gas hydration separation and purification is 48×56=2688KW / h. The industrial electricity price is generally 0.86 to 1.80 yuan / kw·h-1. Calculated at 0.86 yuan, the cost of a mine that uses the equipment of the present invention can save 2311.68 yuan a day.

[0060] When the refrigerant cannot directly utilize external cold energy for circulation refrigeration, the cold energy in the natural cold energy storage pool used for gas hydration separation is released. The total storage capacity is 43039 kJ. The cold energy required for the gas hydration separation process in one day is 2127.6864 kJ. The natural cold energy storage pool can provide nearly 20 days of cold energy. The cost saved by using the natural cold energy utilization and control device suitable for cold-region coal mine gas hydration separation and purification is 46233.6 yuan.

[0061] The present invention can simultaneously realize the storage and utilization of natural cold energy, temperature control, pressure monitoring, control of the injection system, phase equilibrium feedback and purification and collection of gas, and provides a new idea and method for the temperature conditions required for gas hydration separation and purification.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for gas hydration separation using natural cold energy, characterized in that: The invention comprises a cold energy storage tank (1) arranged with a coil (3) and a solution (4), a natural cold energy collector (2) for collecting natural cold energy in winter, a heat exchanger (5) for heating a cooling agent, a gas storage tank (6) for storing gas, a visible reactor (8) for performing gas hydration separation, and a water injection device (7) for injecting liquid into the visible reactor (8), wherein the natural cold energy collector (2) collects external cold energy through the cooling agent, and the cooling agent flows through the coil (3) and exchanges heat with the solution (4) to store cold energy; the cooling agent carrying cold energy flows through the heat exchanger (5) and enters the visible reactor (8) after being heated to a specified temperature; the gas storage tank (6) and the water injection device (7) respectively inject impure gas and water into the visible reactor (8) to perform hydration separation.

2. A system for gas hydration separation using natural cold energy according to claim 1, characterized in that: Solution (4) is sodium chloride ice salt, and its melting point is -3.1°C.

3. A system for gas hydration separation using natural cold energy according to claim 2, characterized in that: A plurality of sets of fans (21) are arranged inside the natural cold energy collector (2) to enhance heat exchange with the coolant.

4. A system for gas hydration separation using natural cold energy according to claim 3, characterized in that: The gas storage tank (6) is connected to an air compressor (61) to charge impure gas into the visual reaction kettle (8); a circulation pump (62) is provided outside the visual reaction kettle (8) to allow the gas in the visual reaction kettle (8) to circulate into and out of the visual reaction kettle (8).

5. A system for gas hydration separation using natural cold energy according to claim 4, characterized in that: The visual reaction kettle (8) is covered with a temperature control box (81) to keep the visual reaction kettle (8) warm. A motor (82) is arranged outside the visual reaction kettle (8), and a rotor (83) is arranged inside the visual reaction kettle (8). The motor (82) and the rotor (83) are rotatably connected.

6. A system for gas hydration separation using natural cold energy according to claim 5, characterized in that: The output end of the visual reactor (8) is respectively connected to a gas collecting bottle (84) and a residual gas bottle (85). After the gas in the visual reactor (8) completes the hydration reaction, the remaining gas is introduced into the residual gas bottle (85). After the gas is completely discharged, the visual reactor (8) is heated to introduce the gas generated by the hydrate into the gas collecting bottle (84).

7. A system for gas hydration separation using natural cold energy according to claim 6, characterized in that: A gas chromatograph (92) is provided outside the visual reaction kettle (8) to perform gas chromatography detection on the gas in the visual reaction kettle (8).

8. The method for operating a gas hydration separation system using natural cold energy according to claim 7, characterized in that: The following steps are involved: Ⅰ. When the external environment temperature gradually drops to a temperature lower than the minimum temperature required in the gas hydration separation process after phase equilibrium calculation, the natural cold energy collector (2) is started to allow the coolant in the pipeline to exchange heat with the external cold air, and the coolant carrying cold energy flows into the coil (3) to exchange heat with the solution (4), and the solution (4) solidifies to store cold energy; Ⅱ. Part of the coolant flows to the heat exchanger (5), and after the coolant is heated to a preset temperature, the coolant is introduced to the outside of the visible reactor (8) to perform heat exchange with the environment inside the visible reactor (8); Ⅲ. Start the water injection device (7) to inject water into the visual reactor (8), and then start the motor (82) so that the rotor (83) stirs the water in the visual reactor (8); IV. When the coolant lowers the temperature in the visual reactor (8) to the initial temperature of the hydration reaction, the air compressor (61) is turned on to pump the gas in the gas storage tank (6) into the visual reactor (8) so that the gas in the gas reacts with water for hydration; V. When the pressure in the visual reaction kettle (8) is stabilized, the gas in the visual reaction kettle (8) is pumped into the residual gas bottle (85). After the pumping is completed, the supply of the refrigerant to the visual reaction kettle (8) is stopped and the visual reaction kettle (8) is heated, and the gas generated by the decomposition of the hydrate is pumped into the gas collecting bottle (84).

9. The method for operating a gas hydration separation system using natural cold energy according to claim 8, characterized in that: When the external environment temperature is high, the natural cold energy collector (2) is turned off, the refrigerant exchanges heat with the solution (4) through the coil (3), and then flows to the heat exchanger (5) for heating to obtain the temperature required for the hydration reaction; when the cold energy of the solution (4) is completely released, electric energy refrigeration is used to obtain the temperature required for the hydration reaction.

10. The method for operating a gas hydration separation system using natural cold energy according to claim 9, characterized in that: Before pumping the gas into the gas storage tank (6), it is necessary to fill the pipeline and the visual reactor (8) with 0.5-0.8 MPa nitrogen and perform a leak test to check the air tightness.

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