20 results about "Carbon dioxide low" patented technology

The utility model discloses a kind of flue gas carbon dioxide low-temperature condensation purification systems, it is related to flue gas carbon dioxide processing technical field.The utility model includes, condensing structure, including conveying pipe, condensing box of sleeving in conveying pipe one side outer wall, liquid nitrogen tank located conveying pipe rear side, heat exchange pipe that is snakelike distribution in condensing box interior and outer wall is flat and is communicated with liquid nitrogen tank output end, conveying port that is staggered distribution between heat exchange pipe, the shrink nozzle of annular array distribution in conveying pipe one end and corresponding heat exchange pipe;Drying structure, including cylinder one and cylinder two located condensing box one side, net cylinder located cylinder one and cylinder two interior, drying agent that is granular in net cylinder interior.The utility model is set to condensing section structure, avoid under high temperature CO2 plasticization effect enhancement, polymer chain spacing expansion, support layer and skin layer thermal expansion shrinkage or skin layer peeling, affect carbon dioxide purification process membrane adsorption stability problem.

This invention relates to the field of carbon dioxide methanation catalysis technology, and discloses a low-temperature carbon dioxide methanation catalyst, its preparation method, and its applications. The catalyst comprises an active component, a support, and an auxiliary agent; the active component is at least one selected from nickel, ruthenium, and rhodium; the support is nitrogen-doped carbon nanotubes; and the auxiliary agent includes at least one selected from transition metal elements and / or rare earth metal elements. The methanation catalyst of this invention exhibits excellent methanation catalytic activity at low temperatures and good stability at high temperatures, producing highly selective methane. The catalyst preparation method is simple and has promising prospects for industrial application.

This invention discloses a carbon dioxide physical adsorption energy storage system and method coupled to a thermal power unit. The outlet of the carbon dioxide compressor is connected to the inlet of the carbon dioxide compressor via the secondary side of a third heat exchanger, the primary side of a first heat exchanger, the secondary side of a second heat exchanger, an energy storage power generation turbine, the secondary side of the first heat exchanger, a low-pressure adsorption carbon dioxide storage tank, and the shell side of a carbon dioxide cooler. The primary side of the second heat exchanger is connected to the reheat outlet of the boiler in the thermal power unit. The cold medium inlet of the heat exchange area of ​​the low-pressure adsorption carbon dioxide storage tank, the tube-side inlet of the carbon dioxide cooler, and the primary side inlet of the third heat exchanger are connected to the outlet of the condenser in the thermal power unit. The extraction port of the low-pressure cylinder in the thermal power unit is connected to the heat medium inlet of the heat exchange area of ​​the low-pressure adsorption carbon dioxide storage tank. This system and method can effectively combine the physical adsorption carbon dioxide low-pressure storage tank with the coal-fired power generation unit.

The invention discloses a carbon dioxide low circulation rate system based on low superheat degree regulation and control, which relates to the technical field of refrigeration and comprises a loop, a plurality of tail end heat exchange branches and a controller, the execution controllability evaluation module is used for calculating the branch outlet superheat degree based on the pressure and temperature measurement values and judging whether the branch outlet superheat degree is in a preset outlet superheat degree target window or not; the branch type judgment module reduces the valve opening degree step by step under the safety constraint to obtain a reducible valve allowance, and accordingly, branches are divided into an over-supply redundancy type, an under-supply sensitive type and an execution limited type to form a redundancy supply set and a protection set; a target pump frequency solving module summarizes the reducible valve margin of the redundant supply set, calculates the pump frequency pressing amplitude and the target pump frequency in combination with the bottleneck margin determined by the protection set, and generates valve bias for redundant branches; according to the invention, on the premise of ensuring stable operation of each tail end, the reduction of the system circulation ratio and the optimization of the pump power consumption are realized.

The application discloses a thermal power generating unit integrating supercritical and transcritical compression carbon dioxide energy storage, wherein the outlet of a low-pressure cylinder is connected with the primary side of a first heat exchanger through a condenser; the outlet of a first compressor is connected with the inlet of a first expander in sequence through the secondary side of the first heat exchanger, a first high-pressure storage tank, the primary side of a second heat exchanger and the secondary side of a third heat exchanger; the outlet of the first expander is connected with the inlet of a chemical absorption carbon dioxide low-pressure storage tank through the secondary side of the second heat exchanger; the gas outlet of the chemical absorption carbon dioxide low-pressure storage tank is connected with the inlet of the first compressor; the outlet of a second compressor is connected with the inlet of a second expander in sequence through a first heat exchange pipe, a second high-pressure storage tank, a second heat exchange pipe and the secondary side of a fourth heat exchanger; and the energy storage density of the unit can be improved under the premise of ensuring the stability of the energy storage system of the thermal power generating unit, and energy efficient utilization is realized.

The invention relates to the technical field of carbon dioxide capture, in particular to a solvent and adsorbent synergistic device for low-carbon capture of carbon dioxide, which comprises a tower drum and a top cover, the top cover is mounted at the top of the tower drum, the top and the bottom of the inner side of the tower drum are fixedly connected with supporting frames, the inner side of the tower drum is provided with a smoke tube, and the smoke tube is fixedly connected with the top of the tower drum. The top and the bottom of the outer side of the chimney are fixedly connected with a plurality of stress pieces, the bottoms of the stress pieces are movably connected with the bearing frame, the top of the inner side of the tower drum is provided with a functional assembly, and the right side of the tower drum is fixedly connected with a supply pipe. The solvent and adsorbent synergistic device for low-carbon capture of carbon dioxide has the advantages that gas-liquid contact is enhanced through rotary uniform spraying and high-specific-surface-area filler, the capture efficiency of carbon dioxide is improved, attachments on the inner wall of equipment are shaken off by means of a centrifugal impact vibration structure, wall hanging of a solvent is reduced in cooperation with a flow guide design, and low-carbon capture of carbon dioxide is achieved. Scaling and derivative corrosion are avoided, and the service life of equipment is prolonged.

The present application relates to the field of low-temperature tank testing, and aims to solve the problem that the existing detection system cannot obtain the weak or defective points of the tank body, thereby failing to optimize the production process and improve the yield, and particularly relates to a sampling test system for the heat insulation capacity of a carbon dioxide low-temperature tank; in the present application, uniform distribution sampling points are created during product production, and sample selection is performed in each sampling point, which can not only uniformly distribute sampling in different production times, but also find the yield difference of products produced at different times through the sampling point sampling aggregation, thereby providing data basis for production line optimization, in addition, through regional detection of the tank, the area with unqualified heat insulation performance can be directly located according to the detection result, and the detection result is combined with the sampling distribution for record, so that the defective rate and unqualified area type of different sampling points can be counted according to the sampling distribution, thereby facilitating subsequent production optimization.

A heat exchanger (2) has: a low-temperature flow path (21) into which a low-temperature liquefied gas is introduced; and a liquefaction target flow path (22) into which gaseous carbon dioxide is introduced. The low-temperature flow path (21) has: a low-temperature fluid inlet (21a) at a location corresponding to an intermediate position between a CO2 inlet (22a) and a CO2 outlet (22b) in the liquefaction target flow path (22); and a low-temperature fluid outlet (21b) at a location corresponding to the CO2 inlet (22a) of the liquefaction target flow path 22. In the low-temperature flow path (21): the low-temperature liquefied gas received through the low-temperature fluid inlet (21a) is heated to be a vaporized gas by exchanging heat with carbon dioxide flowing in a first prescribed region of the liquefaction target flow path (22); and, via a CO2-outlet opening (21c) provided at a position corresponding to the CO2 outlet (22b) of the liquefaction target flow path (22), said heated vaporized gas is caused to exchange heat with carbon dioxide flowing in a second prescribed region of the liquefaction target flow path (22).

The invention discloses a calcium formate and calcium carbonate compound feed additive as well as a preparation method and application thereof. Based on the total mass of the additive, the total mass content of calcium formate and calcium carbonate is not lower than 97%, and the balance is trace water and inevitable trace impurities. The mass of the calcium carbonate is 12%-16% of the mass of the calcium formate; the preparation method comprises the following steps: adding a certain amount of formic acid into a reaction tank; starting stirring, adding calcium carbonate into the formic acid, keeping the formic acid to be excessive, and fully reacting for 2-3 hours; adding excessive calcium hydroxide, and continuously reacting for 2-3 hours; putting the reaction liquid into a liquid storage tray, and standing until the reaction liquid is completely solidified; crushing and drying the solid product under carbon dioxide low-temperature airflow; and sieving the dried product to obtain the calcium formate and calcium carbonate compound feed additive. The feed additive disclosed by the invention is slowly dissolved in water, can effectively improve the palatability, and slowly releases formic acid in animal digestive tracts to achieve the effects of continuously inhibiting bacteria and promoting calcium absorption.

Methods for stimulating hydrogen production from Fe(II)-bearing rocks and minerals under non-hydrothermal conditions (e.g., ≤200oC) by both increasing the rate and extent of hydrogen production and reducing the consumptive loss of hydrogen by abiotic or biotic reactions. The methods utilize a fluid (e.g., liquid) having low levels of oxidants such as oxygen, nitrates, sulfates and carbon dioxide (CO2), low levels of nutrients such as phosphate, a highly basic pH, and elevated Ca2+ or ammonium activity. In some embodiments of the methods, the fluid is free of any or all of oxidants, nitrates, sulfates, CO2, as well as the nutrient phosphate. By use of the terms "free of" and "essentially free of," what is intended is a level of no more than 1 ppm per oxidant.

The present application relates to the technical field of carbon fixation, and particularly relates to a carbon fixation building material preparation method for carbon dioxide foaming sealing and low-pressure forming. The method comprises the following steps: S1. Preparing carbon dioxide gas foam; S2. Preparing geopolymer-based residual slurry soil fluidized filler; S3. Mixing the carbon dioxide gas foam and the geopolymer-based residual slurry soil fluidized filler; S4. Low-pressure extrusion forming a block; and S5. Solidification and carbon dioxide slow-release process. The carbon dioxide gas foam is prepared, mixed with the geopolymer-based residual slurry soil fluidized filler, and low-pressure extrusion forming technology is adopted to seal the carbon dioxide in the block through carbon dioxide foaming, and the subsequent block has the ability of carbon fixation, thereby forming the carbon fixation building material with strength. In the preparation process, the effective sealing and later slow-release reaction of carbon dioxide are realized, which not only can improve the strength of the block, but also can effectively consume a large amount of carbon dioxide, thereby overcoming the problems in the prior art and improving the carbon fixation efficiency.

The invention discloses a storage and preservation method for stone fruits, and belongs to the technical field of storage and preservation of picked fruits and vegetables. In order to solve the technical problems that stone fruits are easy to rot after being picked, the quality is quickly reduced and the storage period is short, the method comprises the following steps: firstly, treating the fruits at 33-35 DEG C for 40-70 minutes, cooling to the core temperature of 0-1 DEG C at the speed of 10-15 DEG C / h, and keeping for 20-30 hours; treating for 2 days in an environment with the temperature of 0-1 DEG C, the relative humidity of 90-93%, the oxygen content of 30-40% and the carbon dioxide content of less than 2%; finally, controlled atmosphere storage is conducted under the same temperature and humidity, oxygen accounts for 2%-3%, carbon dioxide accounts for 5%-7%, and gas parameters are dynamically adjusted according to the concentration of hexanal and the concentration of ethyl alcohol. The method can effectively inhibit microbial growth, delay fruit aging, reduce decay and quality deterioration and prolong the storage date of the flat peaches.

This invention discloses an integrated device and method for a solid-state storage tank-heat exchanger with built-in phase change, belonging to the field of low-temperature phase change energy storage. The invention arranges heat exchange components in the solid carbon dioxide phase change region within the storage tank body to reduce external heat exchange thermal resistance and improve phase change heat exchange efficiency. During the energy storage stage, liquid carbon dioxide is atomized or jetted through a solid generation injection component, partially becoming gaseous and partially solid, with the carbon dioxide stored in a solid state within a sealed space. During the energy release stage, liquid carbon dioxide is injected into the storage tank body and mixes with solid carbon dioxide to form a slurry. The inlets and outlets of the energy storage and energy release stages are staggered to form different intake areas, improving multiphase mixing and intake stability. This invention can be applied to solid-state carbon dioxide low-temperature phase change energy storage, in-tank heat exchange enhancement, closed-loop carbon dioxide recycling, cold energy re-condensation during the energy release stage, industrial waste heat coupled power generation, renewable energy consumption, and distributed long-term energy storage.

The application discloses a kind of carbon dioxide low temperature gas-liquid conversion-oriented storage and conversion integrated device and method;The device includes cold storage tank body and working medium access assembly and transverse cold storage sheet.Multiple transverse cold storage sheets are sequentially spaced arrangement.Adjacent two transverse cold storage sheets form working medium cavity;The inside of transverse cold storage sheet is formed by blowing and expanding to form cold storage cavity;Multiple bulging units are formed by multiple junctions in the cold storage cavity.The position of the bulging unit of adjacent two transverse cold storage sheets is staggered.The cold storage cavity is filled with phase change cold storage material.The application forms the cold storage cavity and working medium cavity alternately arranged in tank body, which helps to improve the efficiency of cold storage cavity absorbing and releasing cold to working medium cavity, so the application can use the phase change cold storage material stored in cold storage cavity to promote gaseous carbon dioxide in input working medium cavity to be quickly liquefied, to realize the integration of carbon dioxide liquefaction equipment and storage equipment.

The invention discloses a low-temperature discharging hose performance testing method based on nitrogen, and belongs to the related field of liquid carbon dioxide low-temperature discharging hose performance testing. Firstly, liquid nitrogen is heated and vaporized; through cooperative work of the PLC and the electronic pressure regulating valve, the temperature of the output nitrogen is stabilized at the preset target temperature. Secondly, nitrogen pressurization is carried out; vaporized low-temperature nitrogen is conveyed into the low-temperature discharging hose through the gas booster pump and pressurized, and the constant pressure is kept through the adjusting valve. And finally, carrying out experimental loading. Liquid nitrogen is used for replacing LCO2 to serve as an experimental medium, the experimental medium can be in a stable gas state under the target working conditions of-56 DEG C and 0-3.5 MPa, and the problem of pipeline blockage caused by phase change of an original medium is solved; liquid nitrogen vaporization and PID temperature control are carried out, and the medium temperature is accurately controlled within the required working condition of-56 + / -1 DEG C; the pressure can be independently adjusted under the condition that the temperature in the low-temperature discharging hose is kept constant, and high-precision temperature control and pressure control in the whole testing process are achieved.

This invention relates to the field of carbon dioxide sequestration technology, and in particular to an Allam power cycle system and method for low-pressure liquid carbon dioxide sequestration. The Allam power cycle system for low-pressure liquid carbon dioxide sequestration includes a combustion chamber, a turbine, a regenerator, a cooler, a gas-liquid separator, a carbon dioxide compressor, a condenser, a liquid separator, a flash tank, and a carbon dioxide sequestration tank. This invention utilizes a compressor to compress cooled and dehydrated carbon dioxide, increasing its pressure so that it can be condensed into a liquid state using water. Subsequently, a flash tank is used to flash-evaporate a portion of the higher-pressure liquid carbon dioxide into low-pressure liquid carbon dioxide and low-pressure gaseous carbon dioxide. The low-pressure liquid carbon dioxide is then sent to the sequestration tank for storage, achieving low-pressure liquid carbon dioxide sequestration. Compared to existing technologies, this effectively reduces the cost of carbon dioxide sequestration and the risk of leakage.

The present application belongs to the technical field of oil field fracturing, and particularly relates to a carbon dioxide fracturing high-low pressure manifold. The present application comprises a pry frame, a carbon dioxide low pressure manifold, a water-based fluid low pressure manifold and a high pressure manifold; the pry frame is a frame structure; the carbon dioxide low pressure manifold is arranged at one end of the pry frame; the water-based fluid low pressure manifold is arranged at the other end of the pry frame and is arranged in the same layer as the carbon dioxide low pressure manifold; the high pressure manifold is fixedly installed on the pry frame and is arranged above the carbon dioxide low pressure manifold and the water-based fluid low pressure manifold and is connected with the water-based fluid low pressure manifold. The present application is used for pre-position fracturing carbon dioxide fracturing alternate injection, can concentrate liquid carbon dioxide supply, pressurize and distribute. The present application changes the existing carbon dioxide fracturing field liquid supply mode, realizes rapid and efficient filling of carbon dioxide storage tank in fracturing field and secondary continuous liquid supplement in fracturing process, ensures efficient supply of liquid carbon dioxide in fracturing field, and effectively improves carbon dioxide fracturing operation efficiency.

The application discloses a kind of thermochemical absorption energy storage combined thermal power generating unit system and its working method, the outlet of carbon dioxide compressor is sequentially communicated with the inlet of energy storage power generation steam turbine by the secondary side of first heat exchanger, supercritical carbon dioxide high-pressure storage tank, the primary side of second heat exchanger and the secondary side of third heat exchanger, the outlet of energy storage power generation steam turbine is communicated with the inlet of chemical absorption carbon dioxide low-pressure storage tank by the secondary side of second heat exchanger, the gas outlet of chemical absorption carbon dioxide low-pressure storage tank is communicated with the inlet of gas-liquid separator, the gas outlet of gas-liquid separator is communicated with the inlet of carbon dioxide compressor, the system and its working method can improve energy storage density, system service life and response rate under the premise of ensuring the stability of thermal power generating unit energy storage system.

The invention discloses a cold storage and exchange integrated device and method for carbon dioxide low-temperature gas-liquid conversion. The device comprises a cold storage tank body, a working medium inlet and outlet assembly and a transverse cold storage sheet. And the plurality of transverse cold storage sheets are sequentially arranged at intervals. A working medium cavity is formed between every two adjacent transversely-arranged cold storage pieces. A cold storage cavity is formed in the transverse cold storage sheet through blowing; a plurality of connecting points are arranged in the cold storage cavity; and the cold storage cavity forms a plurality of bulge units which are communicated with one another through connecting points. The positions of the bulge units of every two adjacent transversely-arranged cold storage pieces are staggered. And the cold storage cavity is filled with a phase change cold storage material. The cold storage cavities and the working medium cavities which are alternately arranged are formed in the tank body, so that the efficiency of absorbing and releasing cold energy of the working medium cavities by the cold storage cavities is improved, and gaseous carbon dioxide input into the working medium cavities can be quickly liquefied by utilizing the phase change cold storage materials stored in the cold storage cavities; and integration of liquefaction equipment and storage equipment of carbon dioxide is realized.