A natural gas hydrate production and transportation system

Abstract

The application discloses a natural gas hydrate production and transportation system, which comprises a gas storage, a hydrate storage and transportation tank, a refrigerator, a pressure regulating valve, a liquid storage tank, a living area / surrounding user, a hydrate storage, a plurality of connecting pipes and a plurality of one-way gas valves, one-way liquid valves and optional liquid pumps. The hydrate storage and transportation tank is provided with a plurality of hydrate storage and transportation tanks, the plurality of hydrate storage and transportation tanks are connected in parallel through the connecting pipes and then connected with the output end of the gas storage through the pressure regulating valve, the liquid storage tank is connected with the optional liquid pump and then sequentially connected with the plurality of hydrate storage and transportation tanks, the plurality of hydrate storage and transportation tanks are connected in parallel and then connected with the input end of the living area / surrounding user through the optional liquid pump, the output end of the living area / surrounding user is sequentially connected with the input end of the plurality of hydrate storage and transportation tanks, and water-insoluble hydrate thermodynamic additives are added in the hydrate storage and transportation tank. The device shortens the process flow of hydrate production and transportation, facilitates the separation of the additives and water, reduces the loss of the additives and the transportation cost of the hydrate.

Description

Technical Field

[0001] This invention relates to the field of natural gas hydrate solidification, storage and transportation equipment, and in particular to a natural gas hydrate production and transportation system. Background Technology

[0002] Natural gas hydrate solidification storage and transportation technology is a novel natural gas storage and transportation technology. Compared with liquefied natural gas (LNG) and compressed natural gas (CNG), this technology has advantages such as shorter process flow, lower cost, and being environmentally friendly and pollution-free. Its underlying principle is to fix gas within hydrates under specific temperature and pressure conditions, and then transport it over long distances in solid hydrate form. Therefore, the hydrate production and transportation system is crucial for the implementation of natural gas hydrate solidification storage and transportation technology. How to generate gas hydrates on a large scale, efficiently, and rapidly, and transport them in a relatively economical manner, is the key scientific problem to be solved in developing this technology.

[0003] To address the issue of large-scale production of gas hydrates, the patent "Preparation Method of Solid Natural Gas Hydrates" (Publication No. CN101955827B) proposes a method for generating solid hydrates from dehydrated and desulfurized natural gas using ethylene glycol as a molding aid, followed by granulation for transportation. While the applicant believes this method enables continuous production of natural gas hydrates, which is beneficial for large-scale production, its core component is only the hydrate generation reactor; it does not integrate or optimize the entire natural gas hydrate production process. Furthermore, the use of ethylene glycol significantly increases the pressure required for gas hydrate generation, and the high gas storage capacity of the hydrates cannot be guaranteed. The patent "A Rapid Synthesis Device for Natural Gas Hydrates" (Publication No. CN106010698A) designs a device for rapid natural gas hydrate generation through stirring. Although this device can quickly produce gas hydrates under laboratory conditions, the use of the stirrer consumes a large amount of energy, making it unsuitable for large-scale industrial production. Moreover, it also focuses only on the hydrate reactor and does not integrate the entire natural gas hydrate production process. Patent "A Method for Manufacturing Natural Gas Hydrates" (Publication No. CN103571557B) proposes a bubbling gas hydrate reactor and a granulation method using liquid nitrogen freezing to obtain solid hydrate particles. However, due to the poor controllability and low cost of the bubbling process, this method has low feasibility in industrial practice. Regarding the transportation of gas hydrates, patent "A Transport Vehicle for Natural Gas Hydrates" (Publication No. CN102371934A) proposes converting a truck bed into a cold storage unit and placing the storage tanks containing the hydrates inside for transportation. Although this transportation method can meet the requirements for long-distance hydrate transportation, has great flexibility, and can be easily integrated with the hydrate production system, refrigerating the entire truck bed would undoubtedly consume a large amount of cold energy, making its economic viability questionable. The patent "Natural Gas Hydrate Storage Tank Transport Vehicle" (publication number CN108638948A) designs a natural gas hydrate storage tank transport vehicle with a refrigeration system. A spiral agitator is installed inside the inner tank to agitate and stir the solid particles in the hydrate slurry. It is mainly suitable for the storage and transportation of hydrate slurry. However, the presence of a large amount of water in the slurry undoubtedly increases the transportation cost per cubic meter of natural gas. Furthermore, the compatibility of this transport vehicle with the natural gas hydrate production end needs further evaluation. Therefore, there is an urgent need to develop an economical, efficient, and practical natural gas hydrate production and transportation system that can meet the requirements of the industrial application of natural gas hydrate solidification and storage technology. Summary of the Invention

[0004] The purpose of this invention is to address the urgent problem of large-scale hydrate production and transportation in the industrialization process of natural gas hydrate solidification and storage technology. Based on existing research in the field of hydrates, this invention provides an economical, efficient natural gas hydrate production and transportation system that meets the practical requirements of industrial application of natural gas hydrate solidification and storage technology.

[0005] This invention is achieved through the following technical solution: a natural gas hydrate production and transportation system, comprising a gas storage facility, hydrate storage and transportation tanks, a refrigeration unit, a pressure regulating valve, a liquid storage tank, a residential area / surrounding users, a hydrate storage tank, several connecting pipes, and several one-way gas valves, one-way liquid valves, and an optional liquid pump; the hydrate storage and transportation tanks are provided in several units, the first input ends of the several hydrate storage and transportation tanks are connected in parallel through connecting pipes and then connected to the output end of the gas storage facility through the pressure regulating valve; the output end of the liquid storage tank is connected to the optional liquid pump and then sequentially connected to the second input ends of the several hydrate storage tanks through connecting pipes and one-way liquid valves; the output ends of the several hydrate storage tanks are connected in parallel through connecting pipes and then connected to the input end of the residential area / surrounding users through the optional liquid pump. The output terminals of the residential area / surrounding users are sequentially connected to the third input terminals of several hydrate storage and transportation tanks; one-way gas valves are respectively installed on the parallel connecting pipes between the first input terminals of the hydrate storage and transportation tanks and the gas storage tank; one-way liquid valves are respectively installed on the parallel connecting pipes between the output terminals of the hydrate storage and transportation tanks; the refrigeration unit is connected to the hydrate storage tank and refrigerates it; the hydrate storage tank contains a natural gas hydrate transport vehicle; after hydrate formation, the hydrate storage and transportation tank is transferred to the natural gas hydrate transport vehicle; a water-insoluble hydrate thermodynamic additive is added to the hydrate storage tank, the density of which is less than the density of water; a valve and a valve cover for sealing the valve are provided at the bottom of the hydrate storage tank.

[0006] The hydrate storage and transportation tanks include a first hydrate storage and transportation tank, a second hydrate storage and transportation tank, a third hydrate storage and transportation tank, and a fourth hydrate storage and transportation tank; the one-way valves include a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve;

[0007] The output end of the gas storage tank is connected to the input end of the first one-way gas valve, and the output end of the first one-way gas valve is connected to the input end of the pressure regulating valve; the first output end of the pressure regulating valve is connected to the input end of the second one-way gas valve, and the second output end of the pressure regulating valve is connected to the first input end of the first hydrate storage and transportation tank; the first output end of the second one-way gas valve is connected to the input end of the third one-way gas valve, and the second output end of the second one-way gas valve is connected to the first input end of the second hydrate storage and transportation tank; the first output end of the third one-way gas valve is connected to the input end of the fourth one-way gas valve, and the second output end of the third one-way gas valve is connected to the first input end of the third hydrate storage and transportation tank; the output end of the fourth one-way gas valve is connected to the first input end of the fourth hydrate storage and transportation tank.

[0008] The one-way liquid valves include a first one-way liquid valve, a second one-way liquid valve, a third one-way liquid valve, a fourth one-way liquid valve, a fifth one-way liquid valve, a sixth one-way liquid valve, a seventh one-way liquid valve, an eighth one-way liquid valve, and a ninth one-way liquid valve; the optional liquid pumps include a first optional liquid pump, a second optional liquid pump, and a third optional liquid pump.

[0009] The output end of the storage tank is connected to the input end of the eighth one-way liquid valve; the output end of the eighth one-way liquid valve is connected to the input end of the third optional liquid pump; the first output end of the third optional liquid pump is connected to the second input end of the fourth hydrate storage and transportation tank, and the second output end of the third optional liquid pump is connected to the input end of the third one-way liquid valve; the first output end of the third one-way liquid valve is connected to the second input end of the third hydrate storage and transportation tank, and the second output end of the third one-way liquid valve is connected to the input end of the second one-way liquid valve; the first output end of the second one-way liquid valve is connected to the second input end of the second hydrate storage and transportation tank, and the first output end of the second one-way liquid valve is connected to the input end of the first one-way liquid valve; the output end of the first one-way liquid valve is connected to the second input end of the first hydrate storage and transportation tank.

[0010] The output terminal of the residential area / surrounding users is connected to the third input terminal of the first hydrate storage and transportation tank; the first output terminal of the first hydrate storage and transportation tank is connected to the third input terminal of the second hydrate storage and transportation tank; the first output terminal of the second hydrate storage and transportation tank is connected to the third input terminal of the third hydrate storage and transportation tank; the first output terminal of the third hydrate storage and transportation tank is connected to the third input terminal of the fourth hydrate storage and transportation tank; the output terminal of the fourth hydrate storage and transportation tank is connected to the first input terminal of the seventh one-way liquid valve; the output terminal of the seventh one-way liquid valve is connected to the input terminal of the first optional liquid pump; the first optional liquid pump... The output terminal is connected to the input terminal of the living area / surrounding users; the second output terminal of the first hydrate storage and transportation tank is connected to the input terminal of the fourth one-way liquid valve, and the output terminal of the fourth one-way liquid valve is connected to the first input terminal of the fifth one-way liquid valve; the second output terminal of the second hydrate storage and transportation tank is connected to the second input terminal of the fifth one-way liquid valve, and the output terminal of the fifth one-way liquid valve is connected to the first input terminal of the sixth one-way liquid valve; the second output terminal of the second hydrate storage and transportation tank is connected to the second input terminal of the sixth one-way liquid valve, and the output terminal of the sixth one-way liquid valve is connected to the second input terminal of the seventh one-way liquid valve.

[0011] The hydrate reservoir is connected to the input end of the ninth one-way liquid valve, and the output end of the ninth one-way liquid valve is connected to the input end of the refrigerator; the output end of the refrigerator is connected to the input end of the second optional liquid pump, and the output end of the second optional liquid pump is connected to the input end of the hydrate reservoir.

[0012] The hydrate storage facility is a semi-underground storage facility with a temperature control range of 271.15K to 271.15K.

[0013] The living area / surrounding users include those with heating / underfloor heating and shower water.

[0014] The hydrate storage and transportation tank is an integrated tank for the production and transportation of gaseous hydrates, and the hydrate storage and transportation tank is detachably installed on the natural gas hydrate transport vehicle.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] (1) The present invention designs a complete hydrate production and transportation system that can meet the requirements of large-scale production and transportation of hydrates in the industrial application of natural gas hydrates.

[0017] (2) The integrated design of hydrate production and transport tanks eliminates the granulation process of hydrates, shortens the process flow of hydrate production and transportation, and greatly reduces the cost of hydrate transportation.

[0018] (3) The use of water-insoluble thermodynamic additives for hydrates can ensure that the additives and water can be easily separated after the hydrates are transported to their destination, thereby greatly reducing the loss of additives and the transportation cost of hydrates. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0020] The following are the meanings of the labels in the attached diagram: 1. Gas storage tank; 2. First one-way gas valve; 3. Second one-way gas valve; 4. Third one-way gas valve; 5. Fourth one-way gas valve; 6. First hydrate storage and transportation tank; 7. Second hydrate storage and transportation tank; 8. Third hydrate storage and transportation tank; 9. Fourth hydrate storage and transportation tank; 10. First one-way liquid valve; 11. Second one-way liquid valve; 12. Third one-way liquid valve; 13. Fourth one-way liquid valve; 14. Fifth one-way liquid valve; 15. Sixth one-way liquid valve; 16. Seventh one-way liquid valve; 17. First optional liquid pump; 18. Second optional liquid pump; 19. Third optional liquid pump; 20. Refrigeration unit; 21. Pressure regulating valve; 22. Eighth one-way liquid valve; 23. Liquid storage tank; 24. Ninth one-way liquid valve; 25. Semi-underground storage tank; 26. Natural gas hydrate transport vehicle; 27. Residential area / surrounding users; 28. Shower water; 29. ​​Heating / underfloor heating. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Example

[0023] See Figure 1 This is a natural gas hydrate production and transportation system, comprising a gas storage facility 1, hydrate storage and transportation tanks, a refrigeration unit 20, a pressure regulating valve 21, a liquid storage tank 23, a living area / surrounding users 27, a hydrate storage tank, several connecting pipes, several one-way gas valves, one-way liquid valves, and an optional liquid pump; there are several hydrate storage and transportation tanks, the first input ends of which are connected in parallel through connecting pipes and then connected to the output end of the gas storage facility 1 through the pressure regulating valve 21; the output end of the liquid storage tank 23 is connected to the optional liquid pump and then sequentially connected to the second input ends of the several hydrate storage and transportation tanks through connecting pipes and one-way liquid valves; the several hydrate storage and transportation tanks... The output end is connected in parallel through connecting pipes and then connected to the input end of the living area / surrounding users 27 through an optional liquid pump. The output end of the living area / surrounding users 27 is sequentially connected to the third input end of several hydrate storage and transportation tanks. One-way gas valves are respectively installed on the connecting pipes in parallel between the first input end of the hydrate storage and transportation tank and the gas storage 1. One-way liquid valves are respectively installed on the connecting pipes in parallel between the output end of the hydrate storage and transportation tank. The refrigeration unit 20 is connected to the hydrate storage tank and refrigerates it. The hydrate storage tank contains a natural gas hydrate transport vehicle 26. After the hydrate is generated, the hydrate storage and transportation tank is transferred to the natural gas hydrate transport vehicle 26.

[0024] The hydrate storage and transportation tanks include a first hydrate storage and transportation tank 6, a second hydrate storage and transportation tank 7, a third hydrate storage and transportation tank 8, and a fourth hydrate storage and transportation tank 9; the one-way valves include a first one-way valve 2, a second one-way valve 3, a third one-way valve 4, and a fourth one-way valve 5.

[0025] The output end of gas storage tank 1 is connected to the input end of the first one-way gas valve 2, and the output end of the first one-way gas valve 2 is connected to the input end of pressure regulating valve 21; the first output end of pressure regulating valve 21 is connected to the input end of the second one-way gas valve 3, and the second output end of pressure regulating valve 21 is connected to the first input end of the first hydrate storage and transportation tank 6; the first output end of the second one-way gas valve 3 is connected to the input end of the third one-way gas valve 4, and the second output end of the second one-way gas valve 3 is connected to the first input end of the second hydrate storage and transportation tank 7; the first output end of the third one-way gas valve 4 is connected to the input end of the fourth one-way gas valve 5, and the second output end of the third one-way gas valve 4 is connected to the first input end of the third hydrate storage and transportation tank 8; the output end of the fourth one-way gas valve 5 is connected to the first input end of the fourth hydrate storage and transportation tank 9.

[0026] The one-way liquid valves include a first one-way liquid valve 10, a second one-way liquid valve 11, a third one-way liquid valve 12, a fourth one-way liquid valve 13, a fifth one-way liquid valve 14, a sixth one-way liquid valve 15, a seventh one-way liquid valve 16, an eighth one-way liquid valve 22, and a ninth one-way liquid valve 24; the optional liquid pumps include a first optional liquid pump 17, a second optional liquid pump 18, and a third optional liquid pump 19;

[0027] The output end of the storage tank 23 is connected to the input end of the eighth one-way liquid valve 22; the output end of the eighth one-way liquid valve 22 is connected to the input end of the third optional liquid pump 19; the first output end of the third optional liquid pump 19 is connected to the second input end of the fourth hydrate storage and transportation tank 9, and the second output end of the third optional liquid pump 19 is connected to the input end of the third one-way liquid valve 12; the first output end of the third one-way liquid valve 12 is connected to the second input end of the third hydrate storage and transportation tank 8, and the second output end of the third one-way liquid valve 12 is connected to the input end of the second one-way liquid valve 11; the first output end of the second one-way liquid valve 11 is connected to the second input end of the second hydrate storage and transportation tank 7, and the first output end of the second one-way liquid valve 11 is connected to the input end of the first one-way liquid valve 10; the output end of the first one-way liquid valve 10 is connected to the second input end of the first hydrate storage and transportation tank 6.

[0028] The output terminal of the living area / surrounding user 27 is connected to the third input terminal of the first hydrate storage and transportation tank 6; the first output terminal of the first hydrate storage and transportation tank 6 is connected to the third input terminal of the second hydrate storage and transportation tank 7; the first output terminal of the second hydrate storage and transportation tank 7 is connected to the third input terminal of the third hydrate storage and transportation tank 8; the first output terminal of the third hydrate storage and transportation tank 8 is connected to the third input terminal of the fourth hydrate storage and transportation tank 9; the output terminal of the fourth hydrate storage and transportation tank 9 is connected to the first input terminal of the seventh one-way liquid valve 16; the output terminal of the seventh one-way liquid valve 16 is connected to the input terminal of the first optional liquid pump 17; the output of the first optional liquid pump 17... The first hydrate storage and transportation tank 6 is connected to the input terminal of the living area / surrounding users 27; the second output terminal of the first hydrate storage and transportation tank 6 is connected to the input terminal of the fourth one-way liquid valve 13, and the output terminal of the fourth one-way liquid valve 13 is connected to the first input terminal of the fifth one-way liquid valve 14; the second output terminal of the second hydrate storage and transportation tank 7 is connected to the second input terminal of the fifth one-way liquid valve 14, and the output terminal of the fifth one-way liquid valve 14 is connected to the first input terminal of the sixth one-way liquid valve 15; the second output terminal of the second hydrate storage and transportation tank 7 is connected to the second input terminal of the sixth one-way liquid valve 15, and the output terminal of the sixth one-way liquid valve 15 is connected to the second input terminal of the seventh one-way liquid valve 16.

[0029] The hydrate reservoir is connected to the input end of the ninth one-way liquid valve 24, and the output end of the ninth one-way liquid valve 24 is connected to the input end of the refrigerator 20; the output end of the refrigerator 20 is connected to the input end of the second optional liquid pump 18, and the output end of the second optional liquid pump 18 is connected to the input end of the hydrate reservoir.

[0030] The hydrate storage facility is a semi-underground storage facility 25, and the temperature control range of the semi-underground storage facility 25 is 271.15K~271.15K.

[0031] The living area / surrounding users 27 includes heating / underfloor heating 29 and shower water 28. In this embodiment, the equipment referred to in the living area / surrounding users 27 mainly includes hot water and heating equipment (i.e., heating / underfloor heating 29) used by employees.

[0032] The hydrate storage and transportation tank is an integrated tank for the production and transportation of gaseous hydrates. The hydrate storage and transportation tank is detachably mounted on the natural gas hydrate transport vehicle 26. In this embodiment, the hydrate storage and transportation tank can be easily removed and installed from the natural gas hydrate transport vehicle 26. When transportation is required, the hydrate storage and transportation tank is mounted on the transport vehicle for transport. After the hydrate is unloaded, the tank can be removed and placed in a storage facility for hydrate production. The hydrate storage and transportation tank is a standardized, uniformly designed tank, requiring that any hydrate transport tank can be easily integrated with the transport vehicle.

[0033] The hydrate storage and transportation tank contains a water-insoluble hydrate thermodynamic additive, the density of which is less than that of water. The tank bottom is equipped with a valve and a valve cover for sealing the valve. In this embodiment, the design of the hydrate storage and transportation tank specifies the use of a water-insoluble hydrate thermodynamic additive (in this embodiment, cyclopentane, propane, tetrahydrothiophene, or trimethylsulfide are selected as the water-insoluble hydrate thermodynamic additive). On the one hand, after the gas hydrate is transported to its destination and the gas is decomposed and unloaded, the tank needs to be transported back. If the water is transported back along with the gas, energy consumption will increase significantly. On the other hand, after the gas is unloaded, the thermodynamic additive also needs to be recycled, and reinstalling a recycling device would undoubtedly increase costs considerably. Using a water-insoluble hydrate thermodynamic additive is much more convenient. After the gas is unloaded, the water-insoluble hydrate thermodynamic additive usually floats on the surface of the water; simply opening the valve at the bottom of the tank is sufficient. By draining the water, the thermodynamic additives can be easily retained within the tank, thus solving the two problems mentioned above. A level sensor can be installed at the bottom of the hydrate storage and transportation tank. When opening the valve, operators can, based on experience, drain some or most of the water before closing the valve and transporting the tank back; alternatively, operators can use the level sensor to ensure that most of the water has been drained and the tank level reaches the minimum set standard before closing the valve, thus preventing the water-insoluble hydrate thermodynamic additives from being drained as well. This reduces the weight of the tank, lowers energy consumption, and reduces costs.

[0034] In this embodiment, the number of hydrate storage and transportation tanks can be set according to the actual production situation. This embodiment only lists the case where four hydrate storage and transportation tanks are set. The hydrate storage and transportation tanks can withstand a certain pressure, which makes the hydrates better adaptable to the needs of the external environment during transportation, and its safety and effectiveness are more guaranteed.

[0035] The operation method of this embodiment is as follows:

[0036] (1) The gas hydrate reaction liquid or additive enters the fourth hydrate storage and transportation tank 9 from the storage tank 23 via the seventh one-way liquid valve 16, with the power provided by the third optional liquid pump 19. It then enters the third hydrate storage and transportation tank 8, the second hydrate storage and transportation tank 7 and the first hydrate storage and transportation tank 6 respectively through the third one-way liquid valve 12, the second one-way liquid valve 11 and the first one-way liquid valve 10 to complete the liquid entry process in the hydrate storage and transportation tank.

[0037] (2) After the liquid injection process is completed, the gas flows out of the gas storage tank 1, passes through the first one-way valve 2 and the pressure regulating valve 21, and enters the first hydrate storage tank 6 to reach the set pressure. Simultaneously, the gas passes through the second one-way valve 3, the third one-way valve 4, and the fourth one-way valve 5 to enter the second hydrate storage tank 7, the third hydrate storage tank 8, and the fourth hydrate storage tank 9 respectively to reach the set pressure. It is worth noting that the maximum design pressure of the gas storage tank 1 must be higher than 10 MPa. When the gas pressure in the storage tank is lower than the set pressure of the hydrate storage tank, a booster pump can be used to increase the pressure. Given the current actual conditions at the natural gas transportation end, the pressure is generally much higher than the set pressure; therefore, the booster pump is not listed in this invention.

[0038] (3) Simultaneously with the completion of the air and liquid intake processes, the refrigeration system (mainly including the refrigeration unit 20, the ninth one-way liquid valve 24, and the second optional liquid pump 18) is turned on to refrigerate the semi-underground storage tank 25. The refrigeration temperature is controlled between 273.15K and 293.15K, with 278.15K being the preferred temperature.

[0039] (4) After the above process is completed, hydrates begin to be generated in the hydrate storage and transportation tanks. The heat released by the generation of gas hydrates in the first hydrate storage and transportation tank 6, the second hydrate storage and transportation tank 7, the third hydrate storage and transportation tank 8 and the fourth hydrate storage and transportation tank 9 is respectively channeled into the main pipe through the fourth one-way liquid valve 13, the fifth one-way liquid valve 14 and the sixth one-way liquid valve 15, and then enters the living area / surrounding user area 27 for user use under the action of the first optional liquid pump 17 through the seventh one-way liquid valve 16. This heat can be used for heating, heating and shower water 28, etc.

[0040] (5) After the high-gas-content hydrate is formed, the hydrate storage and transportation tank is directly placed on the natural gas hydrate transport vehicle 26 for long-distance transportation. After transportation to the destination, the hydrate is decomposed and unloaded. After the hydrate decomposition and unloading are completed, the bottom valve of the hydrate storage and transportation tank is opened to drain the water. After the water is drained, the valve is closed, and the water-insoluble hydrate thermodynamic additive is retained in the tank.

[0041] (6) The hydrate storage tanks, after transportation, containing only thermodynamic additives, can be placed at solidified natural gas filling stations for filling. After the transport vehicle arrives at the filling station, the empty tanks are unloaded and placed in the semi-underground storage tank 25. At the same time, another completed hydrate storage tank is loaded onto the transport vehicle and driven away. It should be noted that the completion of this process requires the standardization and normalization of the hydrate storage tanks and transport vehicles for convenient use.

[0042] The above detailed description is a specific description of feasible embodiments of the present invention. These embodiments are not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the patent scope of this case.

Claims

1. A natural gas hydrate production and transportation system, characterized in that: The system includes a gas storage facility, hydrate storage and transportation tanks, a refrigeration unit, a pressure regulating valve, a liquid storage tank, a living area / surrounding users, a hydrate storage tank, several connecting pipes, and one-way gas valves, one-way liquid valves, and optional liquid pumps. There are four hydrate storage and transportation tanks: a first hydrate storage and transportation tank, a second hydrate storage and transportation tank, a third hydrate storage and transportation tank, and a fourth hydrate storage and transportation tank. The optional liquid pumps include a first optional liquid pump and a third optional liquid pump. The outputs of the four hydrate storage and transportation tanks are connected in parallel via connecting pipes and then connected to the input of the living area / surrounding users via the first optional liquid pump. The output terminals of the living area / surrounding users are sequentially connected to the third input terminals of the four hydrate storage and transportation tanks; the chiller is connected to the hydrate storage tank and refrigerates it; the hydrate storage tank contains a natural gas hydrate transport vehicle; after hydrate formation, the hydrate storage and transportation tanks are transferred to the natural gas hydrate transport vehicle; a water-insoluble hydrate thermodynamic additive is added to the hydrate storage and transportation tank, the density of which is less than that of water; the bottom of the hydrate storage and transportation tank is equipped with a valve and a valve cover for sealing the valve; The one-way air valve includes a first one-way air valve, a second one-way air valve, a third one-way air valve, and a fourth one-way air valve; The output end of the gas storage tank is connected to the input end of the first one-way gas valve, and the output end of the first one-way gas valve is connected to the input end of the pressure regulating valve; the first output end of the pressure regulating valve is connected to the input end of the second one-way gas valve, and the second output end of the pressure regulating valve is connected to the first input end of the first hydrate storage and transportation tank; the first output end of the second one-way gas valve is connected to the input end of the third one-way gas valve, and the second output end of the second one-way gas valve is connected to the first input end of the second hydrate storage and transportation tank; the first output end of the third one-way gas valve is connected to the input end of the fourth one-way gas valve, and the second output end of the third one-way gas valve is connected to the first input end of the third hydrate storage and transportation tank; the output end of the fourth one-way gas valve is connected to the first input end of the fourth hydrate storage and transportation tank. The one-way liquid valve includes a first one-way liquid valve, a second one-way liquid valve, a third one-way liquid valve, and an eighth one-way liquid valve; The output end of the storage tank is connected to the input end of the eighth one-way liquid valve; the output end of the eighth one-way liquid valve is connected to the input end of the third optional liquid pump; the first output end of the third optional liquid pump is connected to the second input end of the fourth hydrate storage and transportation tank, and the second output end of the third optional liquid pump is connected to the input end of the third one-way liquid valve; the first output end of the third one-way liquid valve is connected to the second input end of the third hydrate storage and transportation tank, and the second output end of the third one-way liquid valve is connected to the input end of the second one-way liquid valve; the first output end of the second one-way liquid valve is connected to the second input end of the second hydrate storage and transportation tank, and the second output end of the second one-way liquid valve is connected to the input end of the first one-way liquid valve; the output end of the first one-way liquid valve is connected to the second input end of the first hydrate storage and transportation tank.

2. The natural gas hydrate production and transportation system according to claim 1, characterized in that: The one-way liquid valve further includes a fourth one-way liquid valve, a fifth one-way liquid valve, a sixth one-way liquid valve, and a seventh one-way liquid valve; the output terminal of the living area / surrounding users is connected to the third input terminal of the first hydrate storage and transportation tank, the first output terminal of the first hydrate storage and transportation tank is connected to the third input terminal of the second hydrate storage and transportation tank, and the first output terminal of the second hydrate storage and transportation tank is connected to the third input terminal of the third hydrate storage and transportation tank; the first output terminal of the third hydrate storage and transportation tank is connected to the third input terminal of the fourth hydrate storage and transportation tank, and the output terminal of the fourth hydrate storage and transportation tank is connected to the first input terminal of the seventh one-way liquid valve; the output terminal of the seventh one-way liquid valve is connected to the first... The input terminal of the first selectable liquid pump is connected; the output terminal of the first selectable liquid pump is connected to the input terminal of the living area / surrounding users; the second output terminal of the first hydrate storage and transportation tank is connected to the input terminal of the fourth one-way liquid valve, and the output terminal of the fourth one-way liquid valve is connected to the first input terminal of the fifth one-way liquid valve; the second output terminal of the second hydrate storage and transportation tank is connected to the second input terminal of the fifth one-way liquid valve, and the output terminal of the fifth one-way liquid valve is connected to the first input terminal of the sixth one-way liquid valve; the second output terminal of the third hydrate storage and transportation tank is connected to the second input terminal of the sixth one-way liquid valve, and the output terminal of the sixth one-way liquid valve is connected to the second input terminal of the seventh one-way liquid valve.

3. The natural gas hydrate production and transportation system according to claim 1, characterized in that: The optional liquid pump further includes a second optional liquid pump; the one-way liquid valve further includes a ninth one-way liquid valve; the hydrate reservoir is connected to the input end of the ninth one-way liquid valve, and the output end of the ninth one-way liquid valve is connected to the input end of the refrigerator; the output end of the refrigerator is connected to the input end of the second optional liquid pump, and the output end of the second optional liquid pump is connected to the input end of the hydrate reservoir.

4. The natural gas hydrate production and transportation system according to claim 3, characterized in that: The hydrate storage facility is a semi-underground storage facility.

5. The natural gas hydrate production and transportation system according to claim 1, characterized in that: The living area / surrounding users include those with heating / underfloor heating and shower water.

6. The natural gas hydrate production and transportation system according to claim 1, characterized in that: The hydrate storage and transportation tank is an integrated tank for the production and transportation of gaseous hydrates, and the hydrate storage and transportation tank is detachably installed on the natural gas hydrate transport vehicle.

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