1051 results about "Liquid carbon" patented technology

The invention discloses an ocean temperature difference coupled offshore constant-pressure compressed carbon dioxide energy storage system and method, and relates to the technical field of compressed gas energy storage. The system comprises a working medium constant-pressure storage device, a carbon dioxide energy storage circulation loop, a carbon dioxide energy release circulation loop and a heat storage circulation loop. Gaseous carbon dioxide is condensed into a liquid state by utilizing deep sea low-temperature seawater in an energy storage stage, liquid carbon dioxide is evaporated into a gaseous state by utilizing shallow sea high-temperature seawater in an energy release stage, and gas-liquid conversion of carbon dioxide is realized by fully utilizing ocean new energy and ocean temperature difference; the flexible working medium constant-pressure storage device is used for storing low-pressure gaseous carbon dioxide and high-pressure liquid carbon dioxide, the constant pressure of the working medium constant-pressure storage device in the charging and discharging process can be guaranteed, and efficient and stable operation of the system is achieved. Efficient liquefaction and high-density storage of high-pressure carbon dioxide are achieved through the ocean temperature difference and seawater static pressure, the efficiency and energy density of the energy storage system are improved, and deep development of offshore resources is achieved.

The invention relates to the technical field of underwater vehicle drainage, and discloses an air and carbon dioxide linkage drainage device and an underwater vehicle, the air and carbon dioxide linkage drainage device comprises a power unit, an air unit, a pressure reduction unit and a flow guide assembly, and the power unit is provided with a first storage cavity; the first storage chamber is used for storing liquid carbon dioxide, the air unit is provided with a second storage chamber, the second storage chamber is used for storing high-pressure air, the pressure reduction unit is provided with a pressure reduction chamber, the first air inlet is communicated with the pressure reduction chamber, the first air outlet is communicated with the water ballast space, and a first heating source is arranged in the second storage chamber; the heating source is suitable for generating heat after receiving the signal so as to heat the air stored in the second storage chamber. The technical problems that in the air release process and when the air is in contact with water, the temperature is reduced, so that the volume of the air is reduced, and the drainage capacity of the air and carbon dioxide linkage drainage device is reduced are solved.

The invention relates to the technical field of aircrafts, in particular to a built-in compressed air and carbon dioxide linkage drainage system and an aircraft. The drainage system comprises a drainage device, a water ballast tank, a first connecting pipeline and a control unit, a first storage cavity for storing liquid carbon dioxide is formed in the first power unit, a second storage cavity for storing high-pressure air is formed in the second power unit, and a pressure reduction cavity is formed in the pressure reduction unit; the first storage chamber and the second storage chamber are both selectively communicated with the pressure reduction chamber; the water ballast tank is provided with a third storage chamber selectively communicated with the pressure reduction chamber; the first connecting pipeline is connected with the second power unit and the pressure reduction unit, and a first on-off valve is arranged on the first connecting pipeline; the first power unit is suitable for converting liquid carbon dioxide into high-pressure supercritical carbon dioxide under the control of the control unit, and the high-pressure supercritical carbon dioxide enters the third storage chamber after being decompressed by the decompression chamber, so that the first connecting pipeline selectively communicates with the second storage chamber and the decompression chamber.

The invention relates to the technical field of underwater vehicles, in particular to a modular supercritical carbon dioxide phase change drainage device and an underwater vehicle. The modular supercritical carbon dioxide phase change drainage device comprises a plurality of power unit sets, a plurality of pressure reduction units and a flow guide assembly, each power unit set comprises a plurality of power units, each power unit is provided with a first storage cavity, and the first storage cavity is used for storing liquid carbon dioxide; the plurality of pressure reduction units are in one-to-one correspondence with the plurality of power unit groups, each pressure reduction unit is provided with a pressure reduction chamber, the pressure reduction chambers selectively communicate with the corresponding first storage chambers, and the pressure reduction chambers of the plurality of pressure reduction units communicate with one another; the flow guide assembly is provided with a first air inlet and a first air outlet, the first air inlet communicates with at least one of the multiple pressure reduction cavities, and the first air outlet communicates with the water ballast space. The modular supercritical carbon dioxide phase change drainage device is small in occupied space, safe, efficient and high in drainage capacity.

The invention relates to the technical field of compressed carbon dioxide energy storage, and discloses a liquid compressed carbon dioxide energy storage system and method. The system comprises a carbon dioxide circulation system, and the circulation system comprises a first liquid storage tank (1), a first evaporation unit (100), an energy storage unit (200), a second liquid storage tank (6), a second evaporation unit (300), an energy release unit (400) and a condensation unit (500) which are communicated in sequence. According to the system provided by the invention, a liquid compressed carbon dioxide circulating system is deeply coupled with waste heat and waste cold in an ethylene process, so that the problems of a gasification heat source of liquid carbon dioxide on a high-pressure side and a liquefaction cold source of gaseous carbon dioxide on a low-pressure side of a pressure storage system are solved; the bottleneck constraint of heat energy utilization of the conventional adiabatic compression carbon dioxide energy storage system is broken through; elastic distribution of compression heat between industrial steam production and carbon dioxide overheating can be achieved.

The invention discloses a low-permeability sandstone type uranium mine single-well injection and production method, and belongs to the technical field of in-situ leaching uranium mining. The method comprises the steps that an injection and production well is drilled from the ground to a uranium mine layer; pumping liquid carbon dioxide into the uranium ore layer and soaking; a leaching agent is injected into the uranium ore layer in stages, and soaking is carried out every time the leaching agent is injected; extracting the leachate until the uranium concentration in the leachate is reduced by 10% compared with the initial concentration or the uranium concentration in the leachate is reduced to the preset concentration; carbon dioxide and a leaching agent are supplemented into tail liquid formed after uranium recovery is conducted on the leachate, the tail liquid reaches a saturated state, and the tail liquid in the saturated state is reinjected into the uranium ore layer; and a cycle operation step.

The invention relates to the technical field of lithium ion batteries, and provides a preparation method of a silicon-carbon composite material and a lithium ion battery containing the composite.The preparation method of the silicon-carbon composite material comprises the steps that petroleum coke porous carbon is prepared; the method comprises the following steps: performing vapor deposition doping on petroleum coke porous carbon in a fluidized bed in a protective atmosphere to obtain an intermediate material; mixing the intermediate material with a liquid carbon material, transferring the mixture into a rotary furnace, and carrying out secondary granulation treatment; and carrying out passivating treatment on the material subjected to secondary granulation to obtain the silicon-carbon composite material. The characteristics of high anisotropy and high strength of the petroleum coke matrix are utilized, the impedance is reduced, the compaction density is improved, expansion is reduced, the cycle performance is improved, gas production is reduced through secondary granulation, the electronic conductivity and the coating integrity of the silicon-carbon composite material are improved through passivation, and the service life of the silicon-carbon composite material is prolonged. Therefore, the rate capability and high-temperature storage of the silicon-carbon composite material are improved.

The invention discloses a dynamic monitoring method, system and device for soil carbon loss and a storage medium, and relates to the technical field of environment monitoring, and the method comprises the steps: obtaining soil parameters through a multi-mode sensing array and a runoff monitoring device which are arranged in a target soil area, the soil parameters comprise a soil gaseous parameter, conductivity, a soil solid parameter and a liquid carbon parameter; calculating a carbon loss amount generated by soil respiration according to the soil gas state parameter, and taking the carbon loss amount as a respiration carbon flux; according to the conductivity, the soil solid parameters and a preset soil organic carbon content relation model, calculating the carbon loss amount of soil erosion migration as erosion carbon flux; calculating the carbon loss amount of soil leaching loss according to the liquid carbon parameters, and taking the carbon loss amount as leaching carbon flux; and performing weighted summation on the respiration carbon flux, the erosion carbon flux and the leaching carbon flux to obtain the total carbon loss of the soil in the target area. A more comprehensive carbon income and expenditure evaluation method is provided by establishing a soil total carbon loss calculation framework covering'gas-solid-liquid 'three phases.

The invention relates to the technical field of component detection, and discloses a carbon dioxide monitoring method and system for an offshore FPSO power station heat pump. The method comprises the following steps: performing component analysis and heat exchange treatment on the FPSO power station flue gas to obtain pretreated flue gas and pretreatment parameters, and performing component detection and water washing purification to obtain first clean flue gas and first treatment data; performing temperature field analysis and absorption monitoring on the first clean flue gas to obtain second clean flue gas, amine-rich liquid and second processing data; performing mass transfer detection and deep absorption on the second clean flue gas to obtain third clean flue gas, a first lean amine solution and absorption parameters; performing energy analysis and regeneration treatment on the rich amine solution to obtain carbon dioxide gas, a second lean amine solution and regeneration parameters; and performing purity analysis and liquefaction treatment on the carbon dioxide gas to obtain liquid carbon dioxide and quality parameters. According to the invention, the efficiency and accuracy of carbon dioxide monitoring for the heat pump of the offshore FPSO power station are improved.

The invention discloses an efficient denitrification method and system for landfill leachate, and the method comprises the following steps: diluting waste molasses, and then adding a compound enzyme preparation containing cellulase, pectinase and alpha-amylase for enzymolysis pretreatment to obtain a pretreatment solution; inoculating the pretreatment liquid with a compound flora containing clostridium butyricum and succinic acid-producing anaerobic spirillum, carrying out anaerobic fermentation, and separating to obtain a liquid carbon source containing acetic acid and propionic acid and fermentation residues; mixing the fermentation residues with waste sugar residues, and performing pyrolysis to prepare biochar; and synchronously adding the liquid carbon source and the biochar into a denitrification reactor, and carrying out denitrification on the landfill leachate. The total nitrogen removal load of the landfill leachate denitrification system is increased by 60% compared with that of a single carbon source process, and the sugar manufacturing solid waste recycling rate gt is achieved; 95%. According to the method disclosed by the invention, the dual goals of efficient denitrification and solid waste recycling are achieved through cooperative treatment of the waste molasses and the waste sugar residues in the sugar manufacturing process.

The invention discloses a polyurethane foam preparation process and device based on liquid carbon dioxide foaming, and belongs to the field of polyurethane production. The preparation process comprises the following steps: S1, conveying polyether polyol, polymer polyol and a liquid carbon dioxide foaming agent into a front static mixer, uniformly mixing under a certain pressure state, and conveying into a main mixer; s2, inputting isocyanate into a main mixer in a high-pressure state, and uniformly mixing and stirring the isocyanate and other uniformly mixed raw materials in the main mixer; s3, conveying the water, the silicone oil surfactant, the foaming catalyst and the gel catalyst into a main mixer, stirring and mixing with the raw materials, and conveying into an emulsifier; s4, the mixed raw materials and auxiliary materials are subjected to step-by-step pressure release through a multi-layer screen structure of the emulsifier, so that the liquid carbon dioxide is gradually converted into a gas state from a liquid state in the emulsification and pressure release process and is gradually gasified and foamed, and finally the soft polyurethane foam is prepared through pouring.

The utility model provides a carbon dioxide liquefaction system, a liquid cargo system and a carbon dioxide capture system, and belongs to the technical field of carbon capture. Wherein the liquefying system comprises a compression device, a liquefying device and a storage tank device, the storage tank device receives liquid carbon dioxide output by the liquefying device through a second liquid inlet end and outputs gaseous carbon dioxide in the storage tank device into the compression device, and the compression device recompresses the gaseous carbon dioxide output by the storage tank device and outputs the compressed gaseous carbon dioxide into the storage tank device. Then liquefying by the liquefying device, and inputting into the storage tank device for storage; the gaseous carbon dioxide in the storage tank device is compressed and liquefied into the liquid carbon dioxide again, and the problems that in the liquid carbon dioxide storage process of the storage tank, part of the liquid carbon dioxide in the storage tank is gasified into the gaseous carbon dioxide, loss of the liquid carbon dioxide is caused, and then the liquefaction efficiency of the carbon dioxide is reduced are solved; the loss of liquid carbon dioxide is avoided.

The invention provides a hydrogen direct-fired supercritical carbon dioxide energy storage power generation device system and an operation method. The hydrogen direct-fired supercritical carbon dioxide energy storage power generation device system comprises a hydrogen production and storage unit, a carbon dioxide energy storage unit and a hydrogen fuel combustion power generation unit. And the hydrogen production and storage unit and the carbon dioxide energy storage unit are respectively connected with the hydrogen fuel combustion power generation unit. Two energy storage media of liquid carbon dioxide and high-energy-density green hydrogen are used for energy storage, and super-long-time energy storage can be achieved; and heat energy is subjected to cascade coupling application, stored heat and turbine exhaust heat are fully used for a carbon dioxide cyclic heating heat source, the external emission heat loss of the system is reduced, and the system efficiency is high.

The invention relates to the technical field of underwater vehicle drainage, and discloses an air and carbon dioxide linkage drainage device and an underwater vehicle, the air and carbon dioxide linkage drainage device comprises a power unit, an air unit, a pressure reduction unit and a flow guide assembly, and the power unit is provided with a first storage cavity; the first storage chamber is used for storing liquid carbon dioxide, the air unit is provided with a second storage chamber, the second storage chamber is used for storing high-pressure air, the pressure reduction unit is provided with a pressure reduction chamber, the pressure reduction chamber selectively communicates with the first storage chamber and the second storage chamber, and the flow guide assembly is provided with a first air inlet and a first air outlet; the first air inlet is communicated with the pressure reduction cavity, and the first air outlet is communicated with the water ballast space. The technical problems that carbon dioxide is prone to cooling when encountering water, then volume shrinkage is caused, and the drainage capacity of an air and carbon dioxide linkage drainage device is reduced are solved.

The carbon dioxide unloading system comprises a liquid carbon dioxide storage tank, a heater, an unloading pump, a receiving tank, a plurality of pipelines and a control valve, an outlet of the liquid carbon dioxide storage tank is divided into a first pipeline and a second pipeline, the first pipeline is communicated with the heater, and the second pipeline is communicated with the receiving tank. The second pipeline is communicated to a first inlet of the receiving tank through a fifth control valve; the first pipeline is provided with a first control valve before entering the heater; the carbon dioxide outlet end of the heater is divided into a third pipeline and a fourth pipeline after passing through the second control valve; the third pipeline is provided with a third control valve and communicated with a second inlet of the receiving tank, and the fourth pipeline passes through an eighth control valve and then returns to the liquid carbon dioxide storage tank; the unloading system is provided with at least one pipeline leading to the atmosphere. Through the perfect unloading process flow design, the potential safety hazards that water is frozen, carbon dioxide forms dry ice, the pressure in the unloading system is too high and the like are properly solved, and the unloading system can operate safely and stably.

The invention relates to the technical field of underwater vehicles, and discloses a built-in phase change drainage system and an underwater vehicle, the built-in phase change drainage system comprises a drainage device, a water ballast tank and a control unit, the drainage device comprises a first power unit and a pressure reduction unit, a first storage chamber for storing liquid carbon dioxide is arranged in the first power unit, and a pressure reduction chamber is arranged in the pressure reduction unit; the water ballast tank is provided with a containing cabin used for containing water, and the containing cabin is selectively communicated with the pressure reduction cavity. The control unit is in communication connection with the first power unit, the first power unit is suitable for converting liquid carbon dioxide into high-pressure supercritical carbon dioxide under the control of the control unit, and the carbon dioxide enters the containing cabin after being subjected to pressure reduction of the pressure reduction cavity so as to discharge water in the containing cabin. The drainage system is safe, efficient and high in drainage capacity.

The invention relates to the technical field of power generation system transformation, in particular to an energy storage power generation system and method based on thermal power plant transformation. The Carnot battery unit comprises a liquid carbon dioxide storage tank, an electric heater, a compressor, a heat storage transducer heat flow channel and an expansion machine which are connected in sequence, and the liquid carbon dioxide storage tank adopts a boiler drum of a thermal power plant and stores liquid carbon dioxide liquefied by a water chilling unit of the thermal power plant; the heat storage circulating unit exchanges heat with a heat flow channel of the heat storage transducer to store heat; the steam power generation unit adopts a thermal power plant steam generator set and extracts heat stored by the heat storage circulation unit for steam power generation. The thermal power generating unit is transformed into the carbon dioxide Carnot battery energy storage system, the defect that a power grid is unstable in the process that a traditional thermal power plant is gradually converted into new energy is overcome, double stable output electric quantity is achieved, the system efficiency is improved, and meanwhile high economic benefits are achieved.

The utility model provides a liquid carbon dioxide energy storage refrigerating system. The liquid carbon dioxide energy storage refrigerating system comprises an energy storage system, a refrigerating system and a heat circulation system. The energy storage system comprises a low-pressure liquid storage tank, a first throttling pressure reducing valve, a first heat exchanger, a compressor, a second heat exchanger and a high-pressure liquid storage tank which are sequentially connected in a sealed mode. The refrigerating system comprises a high-pressure liquid storage tank, a second throttling pressure reducing valve, a third heat exchanger, a fourth heat exchanger and a low-pressure liquid storage tank which are sequentially connected in a sealed mode. The heat circulation system comprises a cold storage tank, the cold storage tank is coupled with the first heat exchanger through a circulation pipeline, and the cold storage tank is coupled with the fourth heat exchanger through a circulation pipeline. In the low peak period of electricity utilization, the electric energy is stored in the form of high-pressure liquid carbon dioxide. And the liquid carbon dioxide is gasified and cooled through pressure reduction of the second throttling pressure reducing valve so as to provide cold energy. And meanwhile, cold energy generated in the refrigeration process can be stored through the heat circulation system and used for cooling carbon dioxide in the energy storage process.

The invention discloses a liquid carbon dioxide energy storage system and method coupled with LNG cold energy gradient utilization. The liquid carbon dioxide energy storage system coupled with LNG cold energy gradient utilization comprises an energy storage unit and a power generation unit. The energy storage unit comprises an LNG heat exchanger, a low-pressure liquid storage tank, a low-pressure compressor, a first-stage cooler, a high-pressure liquid storage tank, a first-stage heater and a high-pressure expansion machine. The first input end of the LNG heat exchanger is connected with the output end of the power generation unit, and the first output end of the LNG heat exchanger is connected with the input end of the low-pressure liquid storage tank; the output end of the low-pressure liquid storage tank is connected with the input end of the low-pressure compressor, and the output end of the low-pressure compressor is connected with the first input end of the first-stage cooler. The technical problems that in the compressed carbon dioxide energy storage technology in the prior art, gas at the low-pressure end is difficult to liquefy, and LNG cold energy is seriously wasted are solved, efficient conversion and multi-scene application of the LNG cold energy are achieved, and the economical efficiency, flexibility and environment friendliness of an energy storage system are remarkably improved.

The invention discloses process equipment and method for high-temperature nitrogen-free sintered magnesia, and belongs to the technical field of high-temperature combustion of industrial kilns, and the process equipment is composed of a calcining kiln, a bag-type dust collector, an induced draft fan, a gas cooler, a gas mixer, a liquid oxygen storage tank, a gasifier, PLC control equipment and a high-pressure fan. The oxygen content in the mixed gas is controlled to be 21-25%, artificial nitrogen-free combustion-supporting air is obtained to replace air to complete sintering of magnesia, air is not used, 79% of nitrogen components in the air are prevented from entering a combustion system, discharged tail gas is reduced by more than 2 / 3, heat loss in smoke is reduced, nitrogen oxide is not generated, catalytic reduction denitration is not needed, and the production cost is reduced. As the flue gas does not need to be heated, the energy consumption cost is saved. The concentration of carbon dioxide in discharged flue gas can reach more than 90%, liquid carbon dioxide is prepared through pressurization, and waste is turned into wealth.

The invention provides a preparation method of a small-diameter single-walled carbon nanotube, and relates to the technical field of carbon nanomaterials. The preparation method comprises the following steps: mixing a nanoscale catalyst, high-purity graphite powder and a liquid carbon source binder, and sequentially molding and sintering to obtain a mixed graphite rod; the nanoscale catalyst contains metal elements, and the metal elements are transition metal elements and / or aluminum elements; and carrying out plasma catalytic pyrolysis by taking the mixed graphite rod as an anode and a pure graphite rod as a cathode to obtain the small-diameter single-wall carbon nanotube. The preparation method provided by the invention is high in yield (the mass ratio of the single-walled carbon nanotubes in a crude product is high), and the single-walled carbon nanotubes with smaller tube diameters can be prepared. Results of the embodiment show that when the preparation method provided by the invention is adopted to prepare the single-walled carbon nanotube, the mass ratio of the single-walled carbon nanotube in a crude product can reach 79%, and the diameter of the single-walled carbon nanotube can be as low as 1.2 nm.

The invention discloses a combined cooling, heating and power energy storage system based on liquid carbon dioxide circulation. The combined cooling, heating and power energy storage system comprises a wind / light power generation system, an energy storage system, an energy release system, a heat storage and heat supply system and a cold storage and cold supply system. The wind / light power generation system is connected with the energy storage system through the driving motor, and the energy storage system is connected with the heat storage and supply system through the first heat exchanger. The energy release system is connected with the energy storage system through a second carbon dioxide liquid storage tank; the energy release system is connected with the heat storage and supply system through the second heat exchanger. The cold storage and supply system is connected with the energy storage system through a first cold supply heat exchanger and connected with the energy release system through a second cold supply heat exchanger. Carbon dioxide serves as an energy storage working medium, surplus new energy power of a power grid is stored based on liquid phase storage of the carbon dioxide, meanwhile, by optimizing utilization of cold / heat loads in the energy storage and release process, the requirements for cold supply, heat supply and the like of a user side can be met while power storage is met, and a meaningful thought can be provided for construction and development of a regional micro-grid.

The application discloses a preparation method of a sandwich structure bio-based composite nanofiber aerogel material, and comprises the following steps: step 1), heating and stirring to dissolve low acyl gum; step 2), mixing the product obtained in step 1) with a hot aqueous solution of MXene; step 3), freeze-drying treatment of the aqueous solution of MXene to obtain a compressed layer of MXene; step 4), pasting and covering the product obtained in step 3) on an outer layer obtained in step 2), pouring the gum solution obtained in step 1) into the outer layer to obtain a sandwich structure composite hydrogel; step 5), soaking the product obtained in step 4) in a metal salt solution to harden; step 6), soaking the product obtained in step 5) in an organic solvent solution; and step 7), drying the product obtained in step 6) by using a supercritical liquid carbon dioxide drying method to obtain the sandwich structure bio-based composite nanofiber aerogel. The material has low thermal conductivity.

The invention relates to a carbon dioxide-water-rock dynamic coupling simulation device and method in a geological storage process. The device disclosed by the invention has high-precision temperature and pressure control capability, can accurately simulate various complex geological and engineering environmental conditions, provides a high-precision data basis for research on dynamic migration and transformation of carbon dioxide, and is beneficial to deeply revealing internal laws and mechanisms of the carbon dioxide. According to the device, a mixed solution of liquid carbon dioxide and formation water is adopted and injected from the cross section of the rock core, differential reaction generated in the rock under the condition of continuous carbon dioxide filling can be revealed, and powerful data support is provided for deeply knowing the dynamic behavior of carbon dioxide and interaction between the carbon dioxide and surrounding media.

The invention relates to an energy storage system coupling electrochemistry and compressed carbon dioxide. The system comprises a compressed carbon dioxide energy storage subsystem and an electrochemical energy storage subsystem, the compressed carbon dioxide energy storage subsystem comprises a first liquid carbon dioxide storage tank and a second liquid carbon dioxide storage tank; the electrochemical energy storage subsystem comprises a cooling subsystem and an energy storage battery cabin consisting of a battery pack; and the cooling subsystem is respectively connected with the first liquid carbon dioxide storage tank and the second liquid carbon dioxide storage tank. By adopting the system, the safety of the electrochemical energy storage system can be improved.

Compositions and methods are provided for a system in which liquid carbon dioxide, or a mixture of liquid and gaseous carbon dioxide, is converted to solid carbon dioxide by exiting an orifice at a sufficient pressure drop, e.g., for delivery of carbon dioxide to a concrete mixture in a mixer.

The invention discloses an LNG (Liquefied Natural Gas) cold energy utilization system and method, and the system comprises an organic Rankine cycle power generation unit which is used for heating LNG to-70 DEG C to-40 DEG C and conveying the heated LNG to an intermediate medium cold storage unit; the intermediate medium cold storage unit is used for transferring the cold energy of the LNG to an intermediate medium and heating the LNG into gaseous NG at the same time; and the gas-liquid carbon dioxide energy storage unit is used for transferring the cold energy of the intermediate medium to carbon dioxide. The ultralow-temperature LNG cold energy at the front end is recycled through the organic Rankine cycle power generation unit, direct contact between carbon dioxide and LNG is avoided through the intermediate medium cold storage unit, the LNG tail end cold energy is effectively recycled and effectively transmitted to all links of the gas-liquid carbon dioxide energy storage unit, efficient recycling of the LNG cold energy is achieved, and the energy storage peak shaving capacity is achieved.

The invention discloses a gas-liquid two-phase coordinated regulation carbon dioxide energy storage system and a control method thereof. The carbon dioxide energy storage system comprises a gas storage unit, an energy storage assembly, a liquid storage unit and an energy release assembly which are sequentially connected in a closed loop mode, a gas-liquid two-phase mixed carbon dioxide working medium is stored in the liquid storage unit, a gas phase outlet and a liquid phase outlet are formed in the liquid storage unit, and the gas phase outlet is connected to an inlet of the energy release assembly through a first connecting pipeline; the liquid phase outlet is connected to an inlet of the energy release assembly through a second connecting pipeline, and an evaporator is arranged on the second connecting pipeline. Wherein the liquid storage unit conveys the carbon dioxide gas stored in the liquid storage unit to the energy release assembly at the starting operation stage of the energy release assembly; in the stable operation stage of the energy release assembly, the liquid storage unit conveys the liquid carbon dioxide gas stored in the liquid storage unit to the energy release assembly after being evaporated and gasified through the evaporator. According to the scheme, the starting duration of the turbine of the energy release assembly can be shortened, and the response speed of the energy storage system is increased.

The invention relates to the technical field of oil and gas resource exploration and deep coal and rock gas development, in particular to a wellbore unblocking method based on hydrate impact by carbon dioxide phase change, which comprises the following steps: S1, collecting well pipe column data of a wellbore completely blocked by hydrate, and measuring the depth, temperature and pressure of the hydrate; s2, prefabricating a carbon dioxide phase change impact scheme: according to the size of an oil pipe, the strength of the oil pipe, the depth of hydrate and the pressure and temperature of a shaft above the hydrate, the length and weight of a carbon dioxide phase change device used for the operation of the well to be unblocked and the amount of liquid carbon dioxide are formulated; and S3, the carbon dioxide phase change device is put into the well. The carbon dioxide phase change impact hydrate wellbore unblocking method can be applied to wells with wellbores completely blocked by hydrates and without flow channels, has the advantages of being easy and convenient to operate, large in impact force and high in unblocking efficiency, and solves the problem that when the wellbores are completely blocked by the hydrates and no flow channels exist, the unblocking difficulty is large.

The present invention provides a carbon dioxide phase change directional pressure relief fracturing device for excavation and a method for using the same. The fracturing device includes a liquid storage pipe for storing liquid carbon dioxide, a filling valve, a heater and an explosion relief head; the explosion relief head includes an explosion relief pipeline of a Y-shaped structure, including a first pipeline, a second pipeline and a third pipeline that are interconnected, one end of the first pipeline is connected to the liquid storage pipe, the other end of the first pipeline is obliquely connected to the head end of the second pipeline and the third pipeline, the ends of the second pipeline and the third pipeline face the free surface of the tunnel to be excavated, the ends of the second pipeline and the third pipeline are explosion relief ports, carbon dioxide gas is vented through the explosion relief ports, and the angle between the explosion relief port and the borehole axis is less than 90°. The fracturing device is fixed in an inverted manner in the borehole, so that the explosion relief direction can impact the borehole wall along an oblique angle during the explosion process, and has the advantage that the shock wave is released toward the orifice along the reflection angle, thereby solving the problem of the stability of the existing fracturing device in the borehole. It not only reduces energy loss, but also eliminates the risk of fracturing device recoil.