58 results about "Solid carbon dioxide" patented technology

The application discloses a direct air carbon dioxide capture and utilization system and method using LNG cold energy, which comprises an LNG gasification cold release device, an air carbon dioxide capture device and a carbon dioxide utilization device; ambient air is cooled and dehumidified by a low-temperature cold energy heat exchanger of the LNG gasification cold release device and then enters the air carbon dioxide capture device; when desorbing carbon dioxide, humid carbon dioxide released by the air carbon dioxide capture device is first cooled and dehydrated by the low-temperature cold energy heat exchanger of the LNG gasification cold release device, and then is cooled and liquefied by the low-temperature cold energy heat exchanger of the LNG gasification cold release device to obtain liquid carbon dioxide product. The application solves the problem that the capture efficiency of the direct air carbon dioxide capture system is easily affected by the humidity of ambient air, and through air cooling and dehumidification, humid carbon dioxide product gas is cooled, dehydrated, liquefied and dry ice is prepared, so that the cycle efficiency of air carbon dioxide capture and the system energy utilization efficiency are effectively improved.

The invention discloses a method for releasing liquid carbon dioxide in the technical field of high-pressure pipeline safety release, which is used for a refrigerating system and comprises the following steps of: reducing the flow rate of carbon dioxide entering a well and releasing the carbon dioxide in the well based on the liquid level of a gas-liquid separation tank and the inlet pressure of a throttling and pressure reducing device; the compression power is reduced along with the reduction of the pressure of the air return port of the combined cooling and heating device; after the device is shut down, the carbon dioxide release rate of the lifting well is reduced, and gas return is stopped; when the pressure of the carbon dioxide outlet of the heat exchanger is reduced to a threshold value, discharging is stopped; when the system pressure is balanced, the carbon dioxide in the well is released. The flow of carbon dioxide entering the well is reduced based on the liquid level of the gas-liquid separation tank and the pressure of the throttling and pressure reducing device, well rising carbon dioxide is released, the compression power of the combined cooling and heating device is coupled with the pressure of an air return port, then releasing is stopped, global releasing is conducted after the system pressure is balanced, and the risks of dry freezing, freezing and valve freezing are eliminated; and the discharge safety and the system stability are improved.

The present application belongs to the technical field of ship emergency cargo sweeping and throwing, and particularly relates to an emergency cargo sweeping and throwing device and process for a liquid carbon dioxide transport ship. The present application comprises a liquid cargo bulkhead thickness monitoring sensor, an in-cabin cargo sweeping pipe, a pressure balance pipe, a detachable throwing pipe and an overboard pipe, a liquid cargo vaporizer, and a pressure and temperature sensor. The pipeline pressure is established in advance through the pressure balance pipe, and the phase change of the liquid carbon dioxide occurs only when it flows through the end of the overboard pipe by using the detachable pressure control valve, so that the mixture of powder dry ice and gas is continuously thrown out of the overboard, effectively preventing pipeline blockage. The present application solves the technical problems of slow emergency cargo discharge speed, risk of carbon dioxide enrichment, and dry ice blocking the pipeline in the prior art, realizes the rapid, safe and continuous discharge of liquid carbon dioxide in an emergency, and significantly improves the emergency response capability and operation safety of the ship.

The invention discloses an airtight insect killing system and method for a tobacco storehouse, and the system comprises a control device, a nitrogen gas source, a carbon dioxide gas source, a gas inlet pipeline, a gas exhaust pipeline, a gas extraction device and a plurality of micro-differential pressure sensors, and the control device is used for controlling the gas extraction device to extract gas from all airtight tents in the ith group at the same time; when the first air pressure data in each airtight tent in the ith group reach a preset air pressure range, controlling the exhaust equipment and the exhaust valve corresponding to the ith group to be closed, and then performing air tightness detection according to the second air pressure data in each airtight tent in the ith group; the control equipment is further used for executing N preset nitrogen charging and oxygen reducing procedures after the air tightness detection is qualified; and after the oxygen content in the airtight tents of the ith group reaches a first preset content range, controlling the carbon dioxide gas source to fill carbon dioxide into the airtight tents of the ith group or put dry ice into the airtight tents of the ith group. According to the invention, the efficiency of air tightness detection, nitrogen charging and oxygen reduction and controlled atmosphere insect killing can be improved.

The invention relates to the technical field of cleaning agents, in particular to a method for cleaning a titanium tetrachloride preheater. According to the method for cleaning the titanium tetrachloride preheater, provided by the invention, the titanium tetrachloride preheater is regularly cleaned by adopting dry ice. Dry ice cleaning is a physical process, a cleaning medium is solid carbon dioxide and does not chemically react with equipment materials (such as Inconel 601 alloy) and residual titanium tetrachloride, the problem that corrosive hydrogen chloride gas is generated by traditional water washing is completely eradicated, and an equipment body is protected. Efficient and lossless cleaning of the titanium tetrachloride preheater can be achieved, and the titanium dioxide quality problem caused by falling of a carbon scale layer of the titanium tetrachloride preheater is thoroughly solved.

The application discloses a kind of multiphase state CO2 jet flow simulation experiment device and experimental method thereof, it is related to oil and gas field development, carbon dioxide geological storage (CCUS) technical field, experimental device includes: the pressure-bearing unit that can be opened, for storing dry ice, when pressure-bearing unit is closed, pressure-bearing unit is closed state;Pressure relief structure is installed on pressure-bearing unit, with pressure-bearing unit inside communication, and when the pressure of pressure-bearing unit inside reaches preset value, pressure relief structure makes that pressure-bearing unit inside and outside communication;Wellbore simulation unit, including casing, casing is transparent, pressure-bearing unit and pressure relief structure are arranged in casing;Heating assembly, for heating casing;Temperature measuring unit;Pressure measuring unit;High-speed camera device, etc..The present application can solve the problem that CO2 source uses high-pressure gas cylinder direct gas supply mode to simulate leakage process in existing experiment, which cannot simulate CO2 leakage caused by solid phase blockage, pressure accumulation in closed space and other factors in actual field.

The present invention relates to a solid carbon dioxide cleaning device for a semiconductor package. The solid carbon dioxide cleaning device for a semiconductor package may comprise: a nozzle for cleaning a semiconductor package by spraying solid carbon dioxide from a solid carbon dioxide supply unit; an ionizer installed around the nozzle to remove static electricity from the semiconductor package; and a seating unit providing an upper surface on which the semiconductor package is seated in contact therewith, and preventing static electricity from accumulating in the semiconductor package in contact therewith.

This invention discloses a carbon dioxide unloading method, comprising: starting an unloading pump; adjusting the flow rate of the heating medium in the heater to ensure the gas temperature at the heater outlet is above 5°C; opening the control valve of the pipeline leading to the atmosphere to purge the pipeline within the unloading system with carbon dioxide gas to remove water vapor; closing the control valve of the pipeline leading to the atmosphere; opening the second inlet of the receiving tank; adjusting the flow rate of the heating medium in the heater to slowly fill the receiving tank with carbon dioxide gas at -20°C or higher; opening the fifth control valve and the first inlet of the receiving tank to allow the pressure inside the receiving tank to continue to rise; and connecting the return gas pipeline when the pressure difference between the receiving tank and the storage tank is within 0.5 bar. This invention, through a well-designed unloading process, effectively solves the safety hazards of water freezing, carbon dioxide forming dry ice, and excessive pressure within the unloading system, enabling the unloading system to operate safely and stably.

The invention relates to the field of solid carbon dioxide preparation and forming processing, and discloses a device for efficiently preparing high-density dry ice.The device comprises a base, a device body is arranged at the top of the base, a feeding assembly is arranged in the device body, and a temperature control assembly is arranged in the device body; a blanking assembly is arranged outside the device body, the blanking assembly is combined with the pressing assembly to make the granular dry ice into dry ice blocks, an air injection assembly is arranged at the top of the base and used for cleaning the interior of the pressing assembly, and a radiator is arranged at the top of the device body. And through the arrangement of a heat blocking composite cylinder body structure with a heat exchange runner, thermal isolation of a low-temperature snow making environment in the pressing cavity and a wall surface micro-temperature regulation and control environment is achieved. According to the structural design, input of heat is concentrated on an inner wall contact interface, invalid heat transfer loss is reduced, and the low-temperature stability of the overall structure of the device body is maintained while the gas film generation efficiency is guaranteed.

The invention discloses a method for preparing a high-density aluminum oxide coating by using a suspension plasma spraying technology, and relates to the technical field of suspension plasma spraying, and the method comprises the following steps: 1, carrying out sand blasting treatment on an upper electrode plate; sequentially carrying out high-pressure washing, compressed air blow-drying and drying operations; 2, the upper electrode plate is placed in a sulfuric acid solution to be subjected to hard anodic oxidation treatment; 3, a dry ice sand blasting process is adopted for pretreating the hole periphery area of the surface of the steel plate; step 4, injecting the aluminum oxide suspension into high-energy plasma flame flow through plasma spraying equipment; the aluminum oxide particles in the suspension are rapidly molten in the flame flow, then collide with the surface of the upper electrode plate at a high speed along with the plasma flow, and are rapidly cooled and solidified to form a layer of high-compactness aluminum oxide coating on the surface of the upper electrode plate. By optimizing the coating preparation process and parameters, the compactness and corrosion resistance of the coating are improved, the service life of equipment parts is prolonged, and the cost of a production enterprise is reduced.

The preparation method comprises the following steps: putting flaky tantalum foil and phosphorus powder into a quartz tube as raw materials, adding iodine powder as a transport agent, and sealing the quartz tube; placing the quartz tube in a beaker filled with dry ice and an acetone solution, and vacuumizing the quartz tube; and putting the sealed quartz tube into a tubular furnace, heating to a reaction temperature of 800-900 DEG C, and preserving heat for 0.8-1.2 hours to obtain the TaP thin layer after the reaction is completed. According to the method, a chemical vapor transport method is adopted, the tantalum foil and the phosphorus powder which are regular in shape grow in a high-vacuum-degree closed environment and serve as raw materials, a small amount of iodine elementary substance is added to serve as a transport agent, the TaP thin layer which is high in quality and good in catalytic performance grows, and compared with pure blocky crystals (211.4 mV), the TaP thin layer has more excellent hydrogen evolution catalytic performance.

This invention provides a carbon dioxide recovery system and method that solidifies carbon dioxide into dry ice and then smoothly liquefies and recovers the solidified dry ice without relying on a scraping mechanism. [Solution] The carbon dioxide recovery system 1 according to the present invention comprises a tube 10a through which a refrigerant passes, a shell 10b adjacent to the tube 10a via a heat transfer wall through which a carbon dioxide-containing gas passes, a carbon dioxide solidification device 10 for solidifying carbon dioxide inside the shell 10b, a carbon dioxide-containing gas supply line 75 for supplying carbon dioxide-containing gas to the shell 10b, a refrigerant supply line 71 for supplying refrigerant to the tube 10a, a liquefied carbon dioxide return line 85 and a liquefied carbon dioxide supply line 87 for circulating and supplying liquefied carbon dioxide to the shell 10b, and a liquefied carbon dioxide heater 40 disposed in the liquefied carbon dioxide supply line 87 for heating the liquefied carbon dioxide flowing through the liquefied carbon dioxide supply line 87.

The utility model relates to the field of cement production, in particular to a cement production device capable of reducing carbon emission, which comprises a stirring barrel, a discharge pipe is fixedly connected to the bottom of the stirring barrel, a carbon dioxide rotary kiln is arranged at the bottom of the stirring barrel, and a first pipeline is fixedly connected to one side of the carbon dioxide rotary kiln. A fan is installed on the first pipeline, a pressurizing machine is installed at one end of the first pipeline, a second pipeline is installed on the pressurizing machine, a collecting box is connected to one end of the second pipeline, a collecting box is placed in the collecting box, a pushing mechanism is arranged in the collecting box, and a sealing mechanism is arranged in the collecting box. When the device is used, carbon dioxide can be pressurized through the pressurizing machine, the carbon dioxide is cooled after being pressurized, and the carbon dioxide falls into the collecting box in the collecting box after being made into dry ice, so that pollution to air and the environment is greatly reduced.

The invention discloses an electrochemical calcium cycle carbon dioxide trapping system based on calcium carbonate and calcium hydroxide. The system comprises a calcium hydroxide generation module, a carbonation module and a carbon dioxide treatment module. Firstly, acid and alkali are generated in the calcium hydroxide generation module by adopting an electrochemical method, calcium carbonate is decomposed by the generated acid to obtain calcium ions and release carbon dioxide, and the carbon dioxide is dried, compressed and stored by the carbon dioxide treatment module. And reacting the calcium ions with the generated alkali to obtain calcium hydroxide. Calcium hydroxide can be used as a solid carbon dioxide adsorbent, and carbon dioxide is captured in the carbonation module to obtain calcium carbonate. Therefore, electrochemical calcium cycle carbon dioxide capture is realized. The method is low-carbon, environment-friendly, high in energy efficiency, simple and feasible, and beneficial to solving the problems of energy consumption and pollution of carbon dioxide capture.

The application provides a carbon capture system, a drying tower, a main heat exchanger, a spray tower device and a carbon capture liquid supply device; flue gas dewatered through the drying tower enters the main heat exchanger, the main heat exchanger performs precooling treatment on the flue gas, the precooling treated flue gas enters the spray tower device, is cooled by carbon capture liquid input into the spray tower device by the carbon capture liquid supply device in the spray tower device, carbon dioxide in the flue gas is cooled to the condensation temperature of the carbon dioxide to obtain dry ice, the dry ice is liquefied to obtain liquid carbon dioxide, and the liquid carbon dioxide passes through the main heat exchanger to obtain high-concentration liquid carbon dioxide. Through the carbon capture system provided in the application, the evaporation amount of the carbon capture liquid by the flue gas can be reduced.

The application discloses a carbon dioxide hydrate compression device and a storage method based on LNG ship cold energy utilization, and belongs to the technical field of ship transportation and environmental protection.The device comprises a carbon dioxide hydrate generation unit, a carbon dioxide hydrate compression unit, a transportation unit, an LNG cold energy supply and refrigeration unit and a safety and detection unit.The carbon dioxide generated in the ship flue gas is captured by the hydrate method, and is compressed into blocks by a compressor, is loaded into a storage container and is transferred to a refrigeration chamber, wherein the cold energy of the refrigeration chamber is provided by LNG.The application realizes stable and high-density storage by efficiently utilizing the cold energy of the LNG ship, adopting the storage mode of solid carbon dioxide hydrate, improves the carbon capture efficiency of the ship, and can more effectively utilize the transportation resources in long-distance transportation or sea transportation.

This document provides an apparatus for delivering solid and gaseous carbon dioxide, comprising: (i) a liquid carbon dioxide source including a tank containing liquid carbon dioxide; (ii) a first conduit including a proximal end operatively connected to the liquid carbon dioxide source and a distal end operatively connected to an orifice; (iii) a second conduit operatively connected to the orifice to guide a mixture of gaseous and solid carbon dioxide to a desired destination; and (iv) a third conduit operatively connected to the second conduit, wherein the third conduit includes a portion configured to sufficiently slow the flow of solid carbon dioxide through that portion of the third conduit to cause the solid carbon dioxide to agglomerate before exiting the third conduit through an opening. The apparatus is capable of delivering a precise dose of carbon dioxide at a desired solid-to-gas ratio under low-dose conditions and / or intermittent conditions.

The present application relates to the technical field of lithium battery, and discloses a low-pressure carbon dioxide fire extinguishing method for a lithium battery electric box, which comprises the following steps: step 1, a centralized low-pressure carbon dioxide storage tank unit is arranged, the storage tank unit is connected to a battery cabin through a pipe network, a full-submersion spray head is connected to the end of the pipe network and installed on the cabin top, and a temperature sensor, a smoke detector and a combustible gas sensor are arranged in the battery cabin. The centralized low-pressure carbon dioxide storage tank unit and the solid dry ice continuous spraying technical scheme are adopted, the solid carbon dioxide dry ice is sprayed at a preset rate through the full-submersion spray head at the end of the pipe network, the dry ice rapidly gasifies and absorbs a large amount of heat in the battery cabin, and the spraying duration can reach several hours. Compared with the short-time spraying scheme of aerosol and heptafluoro-propane in the prior art, the technical defects that the spraying time of the conventional fire extinguishing agent is short and the lithium battery thermal runaway cannot be continuously inhibited are solved, and the secondary combustion and heat spread caused by the temperature rise of the battery pack are effectively prevented.

Beverage cooler comprising an airtight, pressurised container (1). The container comprises wet ice (2) and dry ice (3) sublimated at the pressure of the container. The dry ice may be solid carbon dioxide. The wet ice may have a density of at least 0.92 g / cm. The wet ice can have a shape selected between spherical, cubic, diamond and crushed. The airtight, pressurised container (1) may have a pressure between 2 and 4 atm. The wet ice (2) may be individually packaged. The container (1) may be in the form of a polygonal container with a lid (5), a zip-lock bag (5) or a cylindrical can with a lid (5).

This invention provides a method for calcining dolomite, a carbonization method, a calcium-magnesium separation method, and a comprehensive utilization method. The comprehensive utilization method of dolomite includes: calcining dolomite powder to obtain calcined white powder; subjecting the calcined white powder to digestion and aging treatments sequentially to obtain an aging liquid; carbonizing the aging liquid to obtain a carbonization reaction liquid; performing solid-liquid separation on the carbonization reaction liquid to obtain heavy magnesium water and a first solid separate; pyrolyzing the heavy magnesium water to obtain a pyrolysis reaction liquid; performing solid-liquid separation on the pyrolysis reaction liquid to obtain a decomposition liquid and a second solid separate; calcining the second solid separate with magnesium carbonate to obtain magnesium oxide; and reducing the magnesium oxide to obtain metallic magnesium and magnesium aluminum spinel. This invention achieves comprehensive utilization of dolomite resources, with no waste residue or exhaust gas emissions. The main product is metallic magnesium, and the by-products are light calcium carbonate, magnesium aluminum spinel, and solid carbon dioxide.

A direct air capture system to remove atmospheric carbon dioxide is provided. The system may include a solid carbon dioxide sorbent and a thermal regeneration module that cycle an exchange fluid. The exchange fluid may include an amine with an affinity for carbon dioxide such that it removes carbon dioxide from the solid sorbent. The exchange fluid may be heated such as with water vapor to remove carbon dioxide from the exchange fluid such that it can be recycled back to the solid sorbent.

The invention relates to a sodium fluoride production process tail gas treatment method, which comprises: 1) carrying out alkali washing on tail gas by using a NaCOO solution, and carrying out a reaction on NaCOO and hydrogen fluoride to generate sodium fluoride, carbon dioxide and water; sodium fluoride is recycled, and the tail gas contains a large amount of carbon dioxide, water vapor and hydrogen fluoride which does not participate in reaction; (2) firstly condensing at low temperature, and then adsorbing and drying to remove not less than 99% of water vapor in the tail gas; 3) thoroughly removing hydrogen fluoride by using a protection bed filled with an HF-resistant adsorbent, and removing residual water vapor and other impurities in the tail gas through a molecular sieve adsorption tower to obtain pure carbon dioxide; according to the method, hydrogen fluoride in tail gas containing trace hydrogen fluoride is deeply removed, and besides a small amount of recycled sodium fluoride, pure carbon dioxide formed through treatment is ingeniously prepared into the dry ice.

The invention relates to the technical field of solid waste energy utilization, and discloses a method and device for preparing hydrogen-rich methane gas through kitchen garbage hydrothermal cascade. According to the method, through the steps of mechanical crushing, pH adjustment, low-temperature hydrothermal homogeneous classification, three-phase separation, graded high-temperature hydrothermal gasification, gas separation and purification, resource recycling and the like, the technical bottlenecks of large mass transfer resistance and low gasification efficiency during traditional hydrothermal gasification treatment of the wet-based biomass with the high solid content are solved. The corresponding device comprises a crushing unit, a pretreatment unit, a low-temperature hydrothermal unit, a separation unit, a high-temperature gasification unit, a gas purification unit, a heat recovery unit and a cyclic utilization unit, all the units cooperate to realize efficient conversion of kitchen garbage into hydrogen-rich methane gas, carbon dioxide is recovered to prepare dry ice, wastewater is recycled, and a catalyst is recycled and regenerated. And the energy conversion efficiency and the resource utilization rate are obviously improved.

The invention relates to the technical field of carbon dioxide gasification, in particular to a liquid carbon dioxide gasification module which comprises a shell, a liquid carbon dioxide coil pipe, a heat exchange medium pipe and heat exchange fins. The shell is divided into a preheating cavity and a heat exchange cavity, a drain outlet is formed in the lower end of the heat exchange cavity, and a liquid carbon dioxide coil pipe is installed in the preheating cavity; a carbon dioxide liquid inlet flange and a liquid carbon dioxide nozzle are arranged at the two ends of the liquid carbon dioxide coil pipe respectively, the liquid carbon dioxide nozzle is located in the heat exchange cavity, and a gaseous carbon dioxide outlet flange is arranged on the heat exchange cavity; the heat exchange medium pipe is located in the heat exchange cavity, the heat exchange medium pipe is provided with a medium inlet flange and a transfer port, the transfer port is located in the preheating cavity, and the preheating cavity is provided with a medium outlet flange; according to the continuous gasification device, through the arrangement of the preheating cavity, no dry ice is generated in the liquid carbon dioxide coil pipe, then blockage of the liquid carbon dioxide coil pipe is avoided, continuous gasification can be achieved, and the gasification efficiency is improved.

The present invention provides a solid carbon dioxide recovery material having durability capable of long-term use, particularly repeated use with a water-containing gas as an object, and for this purpose, the solid carbon dioxide recovery material of the present invention contains iron, sodium, and crystalline carbon, and more specifically, contains sodium ferrite, crystalline carbon, and at least one binder selected from the group consisting of amorphous carbon, polyamide-imide, polyester, epoxy resin, polyurethane, and acrylic resin.

This patent is about fighting house / apartment / condo / building fires by using dry ice and / or carbon dioxide gas. By the time people call the authorities, the fire has grown so big that it is difficult to control or to extinguish by ordinary fire fighting techniques. Traditional house fire fighting is to spray water into the house so that the flames would disappear and stop burning. This patent involves two methods: 1) throwing, spraying or spreading powder or flakes or pellets of dry ice on or near the fire or around the fire so that the carbon dioxide sublimating from it diffuses and expands to get to the fire or to fill up the house or around the house so that oxygen cannot get into the fire to continue burning; 2) spraying carbon dioxide gas into the house, apartment or building to bring down the oxygen level to stop the fire.

The present invention solves the problems of conventional carbonation curing methods by supplying carbon dioxide through a cement mixture for ultra-high performance concrete that includes dry ice. By utilizing the cement mixture for ultra-high performance concrete containing dry ice and the method for manufacturing ultra-high performance concrete using the present invention, carbon dioxide can be effectively supplied simply by crushing and adding dry ice without using expensive equipment or skilled technicians for carbon dioxide injection. This enables the production of sustainable ultra-high performance concrete with high compressive strength and low carbon dioxide emissions, thereby promoting the sustainability, durability, and engineering performance of ultra-high performance concrete.

To provide a small-sized power generation system requiring no external power supply.SOLUTION: The power generation system (1) includes a vessel (10) containing liquefied carbon dioxide or solid carbon dioxide, a gas engine (20) connected to the vessel (10) and operated by vaporized carbon dioxide supplied from the vessel (10), and a power generator (30) connected to the gas engine (20) and driven by the gas engine (20) to generate power, wherein the gas engine (20) includes an exhaust port 21b for releasing carbon dioxide to the atmosphere, a pipe (24) is provided between the vessel (10) and the gas engine (20), and the pipe (24) is disposed around the power generator (30).SELECTED DRAWING: Figure 2

The present invention provides a method for producing carbonates that can efficiently react carbon dioxide with hydroxides, and an apparatus for producing carbonates. [Solution] The method for producing carbonate comprises the steps of introducing solid hydroxide into a container (S1), introducing solid carbon dioxide into a container (S1), bringing the solid hydroxide and solid carbon dioxide into contact in the container to produce carbonate and water (S2), and recovering the carbonate and water (S3). The step of producing carbonate and water (S2) also includes a step of rotating the container 20.

The invention relates to a carbon capture indirect evaporation cooling tower for a liquid cooling intelligent calculation center. The carbon capture indirect evaporation cooling tower comprises a carbon dioxide adsorption unit, a carbon dioxide desorption unit, a water treatment unit and a carbon dioxide collection and purification unit, the carbon dioxide adsorption unit is used for cooling the high-temperature sodium carbonate solution and adsorbing carbon dioxide to generate a low-temperature sodium bicarbonate aqueous solution; the carbon dioxide desorption unit is used for performing heat exchange heating on the low-temperature sodium bicarbonate aqueous solution to decompose the sodium bicarbonate aqueous solution into a sodium carbonate solution and carbon dioxide; the water treatment unit is used for softening tap water, treating the tap water with alkalescent resin and conveying the tap water to the carbon dioxide adsorption unit; the carbon dioxide collecting and purifying unit is used for desorbing carbon dioxide into liquid carbon dioxide. A sodium carbonate aqueous solution is used for adsorbing carbon dioxide at low temperature to generate a sodium bicarbonate aqueous solution, then high-temperature hot water generated by a liquid cooling data center is used for decomposing the sodium bicarbonate aqueous solution into carbon dioxide, and liquid carbon dioxide or dry ice is prepared after collection.