123 results about "CO2 - Carbon dioxide" patented technology

Disclosed herein are systems and methods of gas sequestration of carbon dioxide from a fossil-fueled hydrogen production plant. The method includes producing at least hydrogen and carbon dioxide above ground from a fossil-fueled hydrogen production plant, injecting at least a portion of the hydrogen and carbon dioxide produced from the fossil-fueled hydrogen production plant into a geological hydrogen storage unit and a geological carbon dioxide storage unit, respectively, wherein the portion of the carbon dioxide is injected concurrently with the portion of the hydrogen. The injection of the portion of carbon dioxide and hydrogen underground are performed through carbon dioxide injection well(s) and hydrogen injection well(s), respectively, wherein a hydrogen injection wellhead(s) and a carbon dioxide injection wellhead(s) are located on a multi-well pad proximate the fossil-fueled hydrogen production plant.

To suppress facility cost as much as possible without newly installing a large-sized dedicated facility so as to recover only carbon dioxide, and efficiently recover carbon dioxide.SOLUTION: A carbon dioxide recovery system 10 includes a supply line 11 for supplying air compressed by a compressor 12 to a pneumatic device 13. A carbon dioxide recovery device 15 for separating and recovering carbon dioxide contained in the air compressed by the compressor 12 from air is provided between the compressor 12 in the supply line 11 and the pneumatic device 13. Thus, the carbon dioxide recovery device 15 is provided between the compressor 12 in the supply line 11 which is an existing facility for supplying the air from the compressor 12 to the pneumatic device 13 and the pneumatic device 13. Therefore, the carbon dioxide is recovered by the carbon dioxide recovery device 15, using the air supplied to the pneumatic device 13 through the supply line 11.SELECTED DRAWING: Figure 1

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 present invention relates to a carbon dioxide electrolysis device including a carbon dioxide electrolysis cell including an anode, a cathode, an electrolyte, and a separation membrane disposed between the anode and the cathode, a supply line for supplying gaseous carbon dioxide and water vapor to the cathode, and a discharge line for discharging products and water vapor generated by the electrolysis reaction of carbon dioxide inside the carbon dioxide electrolysis cell to the outside of the cell, the discharge line including a condenser for condensing the water vapor discharged from the discharge line.

A process for producing a hydrogen product where a carbon-containing input, by reforming and water gas shift, is converted into a synthesis gas largely consisting of hydrogen and carbon dioxide, from which a hydrogen fraction and a carbon dioxide fraction are separated, wherein the hydrogen fraction has the composition required for the hydrogen product and the carbon dioxide fraction has a purity which allows delivery thereof as a product or disposal thereof through sequestration. The characterizing feature here is that the synthesis gas consisting largely of hydrogen and carbon dioxide, by means of a first pressure swing adsorber, is fractionated into a carbon dioxide-depleted first PSA high-pressure fraction and a carbon dioxide-enriched first PSA low-pressure fraction, from which, after compression, the carbon dioxide fraction is obtained by cryogenic gas fractionation.

The invention discloses a coal-fired unit peak regulation power generation system coupled with carbon dioxide energy storage and an operation method of the coal-fired unit peak regulation power generation system. The peak regulation power generation system of the coal-fired unit comprises the coal-fired unit, a carbon dioxide capturing device and a carbon dioxide energy storage device, wherein the coal-fired unit, the carbon dioxide capturing device and the carbon dioxide energy storage device are connected in sequence; the carbon dioxide capturing device captures carbon dioxide in flue gas discharged by the coal-fired unit by using electric power and steam generated by the coal-fired unit; the carbon dioxide energy storage device is used for performing compression energy storage on the carbon dioxide captured by the carbon dioxide capturing device by utilizing electric power generated by the coal-fired unit; the carbon dioxide energy storage device comprises a carbon dioxide compression device and a carbon dioxide expansion power generation device which operate independently. According to the invention, the peak regulation depth of the coal-fired unit can be effectively improved at the low power consumption ebb, and the consumption level of the power grid on off-peak electricity and new energy is enhanced; and the power generation peak capacity of the coal-fired unit can be effectively improved in the power utilization peak.

Carbon Dioxide Capture System in Carbon Dioxide-Laden Gas The present invention relates to a carbon dioxide capture system (1), comprising a first heat exchanger (4a) and a second heat exchanger (4b), each of the heat exchangers (4) comprising a chamber (14), a first pass (12a) and a second pass (12b), the first heat exchanger (4a) and the second heat exchanger (4b) being configured to operate according to a first operating mode and a second operating mode, the capture system (1) comprising control means (5) configured to operate an alternation between the first operating mode and the second operating mode, characterized in that the capture system (1) comprises a drain device (21) hydraulically connected to the first pass and / or the second pass. (Figure 1)

The invention discloses a safe operation tubular column for a carbon dioxide injection well and an operation method, a tubing hanger is hung at the upper end of a casing head, a load test short section is connected below the tubing hanger, and the load test short section is sequentially provided with a sliding sleeve valve, an upper centralizer, a releasing packer, a lower centralizer, a gas injection valve, a tail short section and a screwed plug towards the lower tubular column. After the pipe column enters a well, the annulus protection fluid is positively injected for fluid replacement; a constant-pressure valve ball is put in, and the sealing performance is checked through step-by-step positive pressure; a tubing hanger is seated after pressure relief; the releasing packer is set through positive pressure, then pressure is continuously increased to break the valve seat thin-wall section of the constant-pressure valve seat, and positive injection communication of the tubular column is achieved; and then water is squeezed forwards, after the sealing performance of the packer is verified, a wellhead is installed and connected with a ground process, carbon dioxide is injected forwards, and soaking is conducted after the carbon dioxide reaches the set gas injection amount. The tubular column does not overflow in the process of descending into a well, after positive replacement, a ball is thrown to press and set a packer, a shaft is protected, dirt deposition is prevented, the risk of breakage and falling of the tubular column is completely eradicated, and the operation process is safe and controllable.

Provided are biogenic porous carbon silicon dioxide compositions, as well as related compositions, and methods of making and using such compositions. Exemplary biogenic porous carbon silicon dioxide compositions include a high-carbon biogenic reagent composition that contains at least about 50 wt % total carbon, at most about 5 wt % hydrogen, at most about 1 wt % nitrogen, at most about 0.5 wt % phosphorus, at most about 0.2 wt % sulfur, at most about 0.02 wt % titanium, at most about 0.5% calcium, at most about 0.1% aluminum, and silicon dioxide. The total carbon can be biogenic carbon, and the silicon dioxide can be contained within river rock or silica fume. Also provided are processes for producing such compositions, where the processes can include: preheating a renewable feedstock, pyrolyzing the renewable feedstock, separating certain pyrolysis products, cooling solid pyrolysis products, and introducing silicon dioxide at a certain point in process.

A method for regenerating a bis(iminoguanidine) (BIG) carbon dioxide sorbent, the method comprising: (i) providing a carbonate or bicarbonate salt of the BIG carbon dioxide sorbent, and (ii) directly contacting the carbonate or bicarbonate salt of the BIG carbon dioxide sorbent with steam heated to a temperature within a range of 80°C-130°C to result in regeneration of the BIG carbon dioxide sorbent with simultaneous conversion of the carbonate or bicarbonate anions into carbon dioxide, wherein the regenerated BIG carbon dioxide sorbent is substantially removed of carbonate or bicarbonate and may optionally contain one or more adduct water molecules. In some processes, the regenerated BIG carbon dioxide sorbent is dissolved in water condensing from the steam during the contacting step to form an aqueous solution of the regenerated BIG carbon dioxide sorbent.

The embodiment of the utility model provides an algal-bacterial symbiotic membrane aeration bio-membrane reactor, the algal-bacterial symbiotic membrane aeration bio-membrane reactor comprises a container, a membrane assembly, a carbon dioxide supply device, an oxygen supply device and a light source, the membrane assembly is arranged in the container, the membrane assembly comprises a first membrane wire group and a second membrane wire group which are arranged at an interval, the carbon dioxide supply device is connected with the air inlet of the first membrane filament group to provide carbon dioxide for the first membrane filament group, the carbon dioxide is connected with the air inlet of the second membrane filament group to provide oxygen for the second membrane filament group, and the light source irradiates the first membrane filament group. The bacteria-algae symbiotic membrane aeration bio-membrane reactor disclosed by the embodiment of the utility model has a relatively strong sewage treatment effect.

A method for converting carbon dioxide gas to liquefied carbon dioxide includes (a) receiving, in a heat exchanger, a carbon dioxide gas stream and a liquefied natural gas stream, and (b) exposing the carbon dioxide gas stream to the liquefied natural gas stream to convert the carbon dioxide gas stream to liquefied carbon dioxide, and the liquefied natural gas stream is regasified to natural gas. The natural gas exits the heat exchanger and is sent to a steam methane reformer for further processing.

The invention relates to the technical field of carbon dioxide capture and carbon dioxide energy storage, and discloses a supercritical carbon dioxide energy storage system based on carbon dioxide capture and energy supplementation, which comprises a carbon dioxide capture system, an absorption tower, an energy supplementation system and an energy supplementation system, conveying the mixture into a desorption tower for desorption to regenerate alcohol amine liquid and carbon dioxide; the carbon dioxide energy storage system comprises an energy storage unit and a release unit, and is configured to convey the carbon dioxide in the desorption tower into the energy storage unit to complete the storage process in the energy storage process, and convey the carbon dioxide in the desorption tower into the release unit to complete the release process in the release process; and the release unit absorbs waste heat in the carbon dioxide capture system through the exchange piece. According to the invention, carbon dioxide is captured, sealed and reused, the device has the advantages of high reliability, high cycle efficiency and high energy utilization rate, and a way is provided for solving the greenhouse effect and energy shortage.

The invention discloses a carbon dioxide ore-smelting gasification integrated collaborative device. The device comprises a carbon dioxide gasification unit used for converting liquid carbon dioxide into gaseous carbon dioxide; the carbon dioxide mineralization reaction unit is used for performing mineralization reaction on gaseous carbon dioxide; the hot air circulation system is connected between the mineralization reaction unit and the gasification unit and is used for transferring heat released by the mineralization reaction unit to the gasification unit; the cold air circulating system is connected between the gasification unit and the mineralization reaction unit and is used for returning cold air generated in the gasification process to the mineralization reaction unit for heating; and the ambient air introduction system is used for introducing ambient air into the air heating channel of the mineralization reaction unit, and the ambient air is used for heat exchange of the gasification unit after being heated. Through the synergistic effect of heat released by the mineralization reaction unit and the gasification unit, internal energy self-circulation is formed, efficient gasification and mineralization of carbon dioxide are achieved, energy consumption is reduced, and carbon emission is reduced.

A reformation device for reforming exhaust emissions can be in fluid communication with an exhaust for exhaust emissions from combustion of fuel. The reformation device can be configured to direct exhaust emissions from the exhaust through at least one of a reformation chamber, a bed reactor, and a plasma reformer. The reformation chamber can include a chamber screen comprising copper material for reforming carbon dioxide in the exhaust emissions into copper carbonate. The bed reactor can include a catalyst for reforming carbon dioxide in the exhaust emissions into methanol. The plasma reformer can reform carbon dioxide in the exhaust emissions into methanol. The reformation device can include a fluid solution that reacts with the exhaust emissions.

The invention discloses an intelligent explosion-proof box for a cable intermediate joint, and particularly relates to the technical field of explosion-proof boxes for cable joints, the intelligent explosion-proof box comprises an upper explosion-proof box body and a lower explosion-proof box body, the upper end of the upper explosion-proof box body is fixedly provided with a containing box, and the containing box is filled with sodium bicarbonate particles; a containing box is arranged in the upper anti-explosion box body, a plurality of heat conduction rods are arranged in the containing box in a sliding mode, one end of each heat conduction rod penetrates through the upper anti-explosion box body and is fixedly connected with a heat collection piston arranged on the inner side of the upper anti-explosion box body, an anti-explosion barrel is fixedly arranged on the inner side wall of the upper anti-explosion box body, and an air bag is arranged in the anti-explosion barrel. When explosion is generated in the explosion-proof box body, sodium bicarbonate particles in the containing box can be heated and decomposed, the sodium bicarbonate particles absorb heat when being heated and decomposed, the explosion-proof box body can be cooled, carbon dioxide can be generated through decomposition, and the carbon dioxide can be sprayed into the explosion-proof box body through an air distribution plate; the oxygen content in the explosion-proof box body can be reduced, and the probability of combustion is reduced.

To provide: a transition metal based electrochemical electrode catalyst available for carbon dioxide reduction that improves price competitiveness with better activity than noble metal catalysts such as Ag / C; a production method thereof; an electrode for carbon dioxide reduction reaction containing the catalyst; and a carbon dioxide reduction system including the catalyst.SOLUTION: An electrode catalyst comprises: a support comprising a nitrogen-doped carbon nanostructure; and Ni and Fe in the form of single atoms each supported on the support, where the Ni is bonded to four surrounding nitrogen atoms while the Fe is bonded to five surrounding nitrogen atoms, and where the Ni and Fe at the respective sites are adjacent to each other and are indirectly linked to each other via nitrogen, thereby forming an active site. The electrode catalyst exhibits high carbon monoxide selectivity and current density under a low overpotential condition during reduction of carbon dioxide to carbon monoxide.SELECTED DRAWING: Figure 1

Disclosed herein are systems and methods of gas sequestration of carbon dioxide from a fossil-fueled hydrogen production plant. The method includes producing at least hydrogen and carbon dioxide above ground from a fossil-fueled hydrogen production plant, injecting at least a portion of the hydrogen and carbon dioxide produced from the fossil-fueled hydrogen production plant into a geological hydrogen storage unit and a geological carbon dioxide storage unit, respectively, wherein the portion of the carbon dioxide is injected concurrently with the portion of the hydrogen. The injection of the portion of carbon dioxide and hydrogen underground are performed through carbon dioxide injection well(s) and hydrogen injection well(s), respectively, wherein a hydrogen injection wellhead(s) and a carbon dioxide injection wellhead(s) are located on a multi-well pad proximate the fossil-fueled hydrogen production plant.

The invention belongs to the technical field of mosquito medium prevention and control, and provides an intelligent mosquito trapping device based on skin bionics and carbon dioxide synergistic induction and a mosquito trapping control method.The main scheme is that a master control single-chip microcomputer drives a mosquito suction fan to build basic negative pressure and controls a heating element to maintain the simulated body temperature of a sweat box so as to accelerate volatilization of bionic sweat; intermittently opening according to the human body resting frequency to release carbon dioxide in a pulse manner; carbon dioxide and sweat are mixed through the fluid director and spread all around to form a bionic induction field, and when mosquitoes are attracted to the position near the shell, the mosquitoes are sucked by the negative pressure fan to an anti-escape gauze in the mosquito storage drawer. After the visual identification module monitors that aedes appear in the induction area and accurate confirmation is carried out through a deep learning algorithm, a feedback signal is sent to the single-chip microcomputer to trigger intelligent closed-loop control; the single-chip microcomputer dynamically adjusts the carbon dioxide pulse frequency and temperature control parameters according to the number of the mosquitoes to enhance the induction intensity, so that the mosquitoes are dehydrated and air-dried under the action of continuous airflow, and recognition and counting results are uploaded to the cloud platform.

The invention provides a carbon dioxide energy storage system combined with a magnesium oxide and ammonium chloride co-production system and a control method thereof, and belongs to the technical field of energy storage. The carbon dioxide energy storage system comprises a compression energy storage module, a liquid storage container, an expansion power generation module and a gas storage which are sequentially connected in a closed loop mode, and further comprises a waste heat utilization module. The waste heat utilization module is configured to be capable of absorbing waste heat in flue gas generated by the magnesium oxide production subsystem and waste heat of carbon dioxide separated by the flue gas treatment subsystem, and is configured to be capable of supplying heat to the expansion power generation module in an energy release stage; the gas storage is configured to be capable of temporarily storing gaseous carbon dioxide separated from the flue gas generated by the flue gas treatment subsystem from the magnesium oxide production subsystem; the carbon dioxide energy storage system is configured to be capable of compressing and condensing gaseous carbon dioxide in the gas storage in the energy storage stage, and liquid carbon dioxide is stored in the liquid storage container. The carbon dioxide energy storage system can improve the waste heat utilization rate and reduce the overall cost.

The present invention provides an auxiliary cementitious material with high efficiency in carbon fixation based on a two-step method, and a preparation method and application thereof. The present invention uses carbide slag as a calcium source, low-calcium fly ash as an adsorption carrier and a calcium source, and uses ethylenediaminetetraacetic acid (EDTA) to pretreat the low-calcium fly ash, and then mixes the pretreated low-calcium fly ash with carbide slag and reacts with industrial waste gas containing carbon dioxide to prepare a cementitious material. The method of the present invention has cheap and readily available raw materials, high efficiency, and low energy consumption; it can permanently seal carbon dioxide in industrial waste gas, and the carbon dioxide sealing amount and sealing efficiency are high; it fully realizes the resource recycling of fly ash and carbide slag waste. The cementitious system prepared by compounding the obtained cementitious material and cement has higher strength and faster setting time, and is expected to replace more cement clinker to prepare low-carbon composite cement.

The utility model provides an energy storage system which comprises an energy storage tank group which comprises a plurality of energy storage tanks which are communicated in series, and part of the energy storage tanks are filled with spacer fluid; the air energy storage module can store and release energy by utilizing compression and expansion of air, and is connected with the energy storage tank group, so that compressed air pushes the spacer fluid to flow to the downstream in the first flowing direction when entering the energy storage tank group, and carbon dioxide in the energy storage tank located at the downstream of the spacer fluid is extruded; and the carbon dioxide energy storage module can store and release energy by utilizing phase change of carbon dioxide, and the carbon dioxide energy storage module is connected with the energy storage tank group, so that when the carbon dioxide enters the energy storage tank group, the carbon dioxide pushes the spacer fluid to flow towards the upstream in the downstream direction of the first flowing direction so as to extrude the compressed air in the energy storage tank located at the upstream of the spacer fluid. In this way, isolation of two working media, namely compressed air and carbon dioxide, is achieved in the energy storage stage and the energy release stage, and therefore the energy storage efficiency and the stability of the energy storage system are improved.

To provide a carbon dioxide applying apparatus constituted to apply carbon dioxide into an agricultural greenhouse in which a combustion state in a combustion part can be maintained in a good condition while reducing environmental load.SOLUTION: A carbon dioxide applying apparatus comprises a combustion part, piping, an air introducing part, a blower, and a discharge valve. The combustion part is constituted so as to introduce air for combustion, burn woody fuel, and generate combustion exhaust gas. The air introducing part is constituted so as to introduce air for diluting combustion exhaust gas. The blower is constituted so as to send out combustion exhaust gas to an agricultural greenhouse. The discharge valve is constituted to be capable of changing a flow channel of combustion exhaust gas between the air introducing part side and the agricultural greenhouse side.SELECTED DRAWING: Figure 1

An apparatus and process for capturing carbon dioxide from exhaust output from at least one ship engine on the ship for storage of the carbon dioxide on the ship. The storage of the carbon dioxide on the ship can facilitate delivery of the captured carbon dioxide to a fuel production system at a port of destination or other port that the ship may arrive at to provide the captured carbon dioxide to the fuel production system. The fuel production system may then use the carbon dioxide to form a fuel (e.g. methane, methanol, etc.). The fuel that is produced can be provided to other ships at the port. The carbon capture system can utilize membranes, adsorption, and / or absorption for capturing the carbon dioxide. The carbon dioxide can be stored on the ship in at least one storage vessel of the ship.

The invention discloses an aquarium water-gas interface carbon dioxide gas monitoring linkage control device and method, and belongs to the technical field of aquarium related equipment. The aquarium water-gas interface carbon dioxide gas monitoring linkage control device comprises a container body with an opening in the lower portion, and the opening of the container body is immersed into a water body of an aquarium water-gas interface; the gas enrichment cavity collects carbon dioxide which is dissolved in a water body and escapes from a water-gas interface in the area, the carbon dioxide passes through the vent hole and is detected by the sensing detection unit through the waterproof breathable film to generate carbon dioxide concentration data, and the control unit calculates the carbon dioxide partial pressure slope and the carbon dioxide escape flux according to the carbon dioxide concentration data; the carbon dioxide output of the carbon dioxide supply assembly is controlled based on the carbon dioxide escape flux. The system can monitor carbon dioxide dissolution in a water body in real time, timely reflect the carbon dioxide concentration change dynamic state of the water body, automatically control the supply amount of carbon dioxide, ensure the stability of photosynthesis of green plants in the aquarium, and realize dynamic balance of the carbon dioxide dissolution amount of the water body.

The application provides a kind of based on multi-field coupling's bionic mineralization reinforced soil method, belongs to geotechnical engineering technical field.The bionic mineralization reinforced soil method includes: first, the soil quality of target area is detected, obtains soil structure type, calculates soil structure correction coefficient, gas correction coefficient and calcium ion correction coefficient;Then, vacuum preloading system and ultrasonic excitation system are arranged in target area at intervals, based on soil structure type and soil structure correction coefficient, the working parameters of vacuum preloading system and ultrasonic excitation system are set, vacuum preloading system and ultrasonic excitation system are opened in turn, and reinforcing solution containing calcium source and bionic crystal form control agent is injected into target area;Finally, stop injecting reinforcing solution, ammonia and carbon dioxide are injected in turn, carbon dioxide is converted into carbonate ion under ammonia atmosphere and bionic mineralization reaction occurs with reinforcing solution, so as to reinforce target area.

A method for regenerating a bis(iminoguanidine) (BIG) carbon dioxide sorbent, the method comprising: (i) providing a carbonate or bicarbonate salt of the BIG carbon dioxide sorbent, and (ii) directly contacting the carbonate or bicarbonate salt of the BIG carbon dioxide sorbent with steam heated to a temperature within a range of 80° C.-130° C. to result in regeneration of the BIG carbon dioxide sorbent with simultaneous conversion of the carbonate or bicarbonate anions into carbon dioxide, wherein the regenerated BIG carbon dioxide sorbent is substantially removed of carbonate or bicarbonate and may optionally contain one or more adduct water molecules. In some processes, the regenerated BIG carbon dioxide sorbent is dissolved in water condensing from the steam during the contacting step to form an aqueous solution of the regenerated BIG carbon dioxide sorbent.

The utility model relates to the technical field of smoke and poison gas absorption vehicles, in particular to a movable smoke and poison gas absorption vehicle, which is characterized in that sulfur dioxide in waste gas is in contact with a hot copper oxide rod and then chemically reacts to generate copper sulfate, so that the sulfur dioxide in the waste gas can be removed; carbon monoxide in the waste gas is in contact with the hot copper oxide rod and then is subjected to chemical reaction, the carbon monoxide is converted into carbon dioxide, the carbon dioxide enters a calcium hydroxide aqueous solution and then is subjected to chemical reaction with calcium hydroxide in the calcium hydroxide aqueous solution, calcium carbonate is generated, and harmful substances such as carbon monoxide, sulfur dioxide and smoke dust in contaminated air are all removed; clean air is discharged from the air outlet and can be directly discharged into the atmosphere, when the place of the absorption vehicle needs to be replaced, the compartment is directly pushed, the universal wheels at the bottom of the compartment can bring the compartment to the wanted place, and the absorption vehicle is small in appearance, small in occupied area, easy to operate and capable of purifying various harmful substances at the same time.

An apparatus and process for capturing carbon dioxide from exhaust output from at least one ship engine on the ship for storage of the carbon dioxide on the ship. The storage of the carbon dioxide on the ship can facilitate delivery of the captured carbon dioxide to a fuel production system at a port of destination or other port that the ship may arrive at to provide the captured carbon dioxide to the fuel production system. The fuel production system may then use the carbon dioxide to form a fuel (e.g. methane, methanol, etc.). The fuel that is produced can be provided to other ships at the port. The carbon capture system can utilize membranes, adsorption, and / or absorption for capturing the carbon dioxide. The carbon dioxide can be stored on the ship in at least one storage vessel of the ship.

To provide a dry ice snow cleaning device that can prevent dew condensation and freezing from occurring due to a decrease in temperature of an injection nozzle, can inject a mixed gas containing dry ice snow at a wide angle and a high speed, and has excellent cleaning efficiency.SOLUTION: A dry ice snow cleaning device includes: a liquefied carbon dioxide gas supply path that supplies a liquefied carbon dioxide gas G1 while adjusting the pressure and temperature of the gas; an assist gas supply path that supplies an inert gas or compressed air as an assist gas G3; a jet nozzle 2 which is located at an outlet side of the liquefied carbon dioxide gas supply path, jets a mixed gas G4 obtained by combining dry ice snow G2 generated from the liquefied carbon dioxide gas G1 and the assist gas G3 from a jet port 43a to the object to be cleaned. The jet nozzle 2 includes a slit flow passage 25 having a multi-pipe structure with double or more pipes and communicating with an injection port 43a to restrict the injection direction of the mixed gas G4, and jets the mixed gas G4 from the slit flow passage 25 in a flat plate shape.SELECTED DRAWING: Figure 2