In-situ Carbon dioxide carbonation mortar production plant and Carbon dioxide carbonation mortar composition compounded using the same

Abstract

The present invention relates to an on-site mixing mortar production plant that mixes cement, sand, and water at the site to provide mortar, and to an in-situ carbon dioxide carbonation mortar production plant configured to suppress the escape and leakage of carbon dioxide due to vaporization by converting captured carbon dioxide into a crystalline dry ice state and injecting it when mixing water into dry mortar, and to a CO2 carbonation mortar composition mixed using the same. The present invention provides an in-situ carbon dioxide carbonation mortar production plant for injecting captured carbon dioxide into mortar on-site, comprising: a silo that accommodates dry mortar and is equipped with a discharge hopper at the bottom; a conveying unit comprising a receiving housing into which the dry mortar discharged through the discharge hopper is fed, and in which a water supply port and a carbon dioxide injection port are formed at the starting point of the transfer, and a conveying screw having screw blades coupled along a rotating shaft installed longitudinally inside the receiving housing; a mixing unit comprising a mixing housing in which a front end is formed continuously connected to one side of the conveying unit and a discharge port is formed at the rear end, and a shaft blade having a plurality of blades coupled along a rotating shaft extended longitudinally inside the mixing housing; a bomb in which carbon dioxide recovered by the capture process is stored as liquid carbon dioxide; and a carbon dioxide supply unit that converts the liquid carbon dioxide introduced from the bomb into a crystalline dry ice state and supplies it to the carbon dioxide injection port. In addition, the present invention further provides a carbon dioxide carbonation mortar composition characterized by being mixed on-site using the above-described in-situ carbon dioxide carbonation mortar production plant.

Description

Technology Field

[0001] The present invention relates to an on-site mixing mortar production plant that mixes cement, sand, and water at the site to provide mortar, and to an in-situ carbon dioxide carbonation mortar production plant configured to suppress the escape and leakage of carbon dioxide due to vaporization by converting captured carbon dioxide into a crystalline dry ice state and injecting it when mixing water into dry mortar, and to a CO2 carbonation mortar composition mixed using the same. Background Technology

[0003] Recently, as policies to address climate change and achieve net-zero carbon neutrality have been strengthened globally, interest in technologies capable of reducing or sequestering carbon dioxide emissions has been rapidly increasing in the construction industry. In particular, construction materials based on inorganic binders, such as cement and mortar, are recognized as a representative industrial group that emits large amounts of carbon dioxide during their manufacturing and usage processes; consequently, carbon reduction technologies for these materials are emerging as a critical international technological challenge. The production of one ton of Portland cement (OPC) emits approximately 0.8 tons of carbon dioxide; most of this is emitted during the clinker manufacturing process, about 0.5 tons are emitted as CO2 is separated when limestone (CaCO3) is heated to form calcium oxide (CaO), and about 0.3 tons are emitted due to fuel consumption during kiln operation. Consequently, the CO2 generated from cement and concrete production processes amounts to approximately 2.6 billion tons annually, accounting for about 7–8% of total global CO2 emissions.

[0004] Therefore, in order to reduce carbon emissions, research and attempts are continuously being made to decrease cement usage by replacing kiln operating fuel with waste synthetic resins and biomass, or by replacing cement binders with non-carbonate raw materials and admixtures.

[0005] Overseas, policies for carbon reduction are being implemented by imposing penalties on carbon-emitting industries through carbon taxes or providing incentives for contributions to carbon reduction.

[0006] For example, in some countries like Singapore, systems are already in place that provide substantial carbon reduction incentives and economic benefits to construction companies or developers when facilities are applied to directly mix carbon dioxide into construction materials or perform carbon mineralization during the construction process. These systems operate beyond mere environmental regulations to enhance the economic viability of construction projects that incorporate carbon reduction equipment. In contrast, while direct economic benefits from the introduction of carbon reduction equipment in Korea are currently limited, there is a growing need to proactively secure carbon reduction technologies that can be practically applied at construction sites, considering future tightening of international carbon regulations and expansion into overseas markets.

[0007] In particular, the residential construction environment in South Korea possesses characteristics that distinguish it significantly from those overseas. In the construction of domestic multi-unit housing, especially apartments, the "floor screeding" (also known as "bangtong") process—in which large quantities of mortar are poured to cover boiler pipes embedded in the floor for underfloor heating—is an essential step. Unlike overseas dry floor systems or lightweight floor structures, this process consumes a substantial amount of mortar per household; when calculated on a scale of an entire apartment complex, it involves the mixing and use of massive quantities of mortar on-site. In other words, the domestic construction market is characterized by a high consumption of in-situ mortar, which implies significant potential for substantial cumulative carbon reduction effects per project if carbon reduction technologies are applied to the mortar.

[0008] However, technology for carbon dioxide fixation has not yet been clearly established in Korea. Furthermore, in construction sites where dry mortar is supplied, mixed, and poured on-site using mobile silos—similar to domestic construction sites—it is difficult to directly apply factory-type carbonation facilities. Consequently, a compact yet stable carbon injection plant system suitable for site conditions is required. Since the process of mixing dry mortar with water involves a continuous sequence of mixing, transfer, and blending, a system capable of continuously and uniformly injecting carbon dioxide while preventing nozzle clogging or leakage is essential.

[0009] Injecting carbon dioxide reacts with cement hydration products to promote crystallization, which can improve the early and long-term strength of the mortar. Consequently, a dual carbon reduction effect can be expected through carbon fixation and reduced cement consumption. However, since cement usage is reduced due to the strength increase caused by carbon dioxide injection, it is essential to continuously and uniformly add carbon dioxide during the mixing process of dry mortar and water to achieve uniform strength.

[0010] The applicant's registered patent 10-2621622, 'Mobile Silo Device Equipped with CO2 Injection Device,' proposes a method for injecting CO2 into mixed cement for field-mixed mortar, presents a concept for a CO2 injection device applied to a mobile silo, and provides a device capable of injecting CO2 into mortar.

[0011] However, the above invention does not sufficiently provide a configuration for uniform input of carbon dioxide and suppression of external leakage due to vaporization. Accordingly, the present invention aims to provide an improved field-applicable carbonation mortar production plant capable of simultaneously achieving uniform input of carbon dioxide and suppression of external leakage. Prior art literature

[0013] 1. Registered Patent 10-2621622 "Mobile silo device equipped with a CO2 injection device" 2. Registered Patent 10-2609295 "Mobile automatic mixing material feeding device" 3. Registered Patent 10-2754863 "Carbon dioxide capture and carbon resource utilization, and hydrogen production system for cement manufacturing facilities" 4. Registered Patent 10-1558944 "Carbonation treatment device for recycled aggregate by an integrated composite facility of a spreader and a silo" 5. Published Patent 10-2024-0162092 "Carbon dioxide fixation device and carbon dioxide fixation method" The problem to be solved

[0014] The present invention relates to an on-site mixing mortar production plant that mixes mortar while injecting carbon dioxide at the site. It is equipped with a carbon dioxide supply unit that converts captured carbon dioxide into crystalline dry ice when mixing water with dry mortar, thereby suppressing escape and leakage due to the vaporization of carbon dioxide and preventing cooling of the injection nozzle to enable continuous injection. The purpose of the invention is to provide an in-situ carbon dioxide carbonation mortar production plant configured compactly to suit site conditions, and a CO2 carbonation mortar composition mixed using the same. means of solving the problem

[0016] To solve the aforementioned problem, the present invention provides an "in-situ carbon dioxide carbonation mortar production plant for injecting captured carbon dioxide into mortar on-site, comprising: a silo that accommodates dry mortar and is equipped with a discharge hopper at the bottom; a conveying unit comprising a receiving housing into which the dry mortar discharged through the discharge hopper is fed, a water supply port and a carbon dioxide injection port formed at the starting point of conveyance, and a conveying screw having screw blades coupled along a rotating shaft installed longitudinally inside the receiving housing; a mixing unit comprising a mixing housing in which a front end is continuously connected to one side of the conveying unit and a discharge port is formed at a rear end, and a shaft blade having a plurality of blades coupled along a rotating shaft extended longitudinally inside the mixing housing; a bomb in which carbon dioxide recovered by a capture process is stored as liquid carbon dioxide; and a carbon dioxide supply unit that converts the liquid carbon dioxide introduced from the bomb into a crystalline dry ice state and supplies it to the carbon dioxide injection port."

[0018] At this time, the carbon dioxide supply unit may be configured to include: a casing connected to the bomb and through an inlet pipe; a cooling pipe provided on the upper part of the casing, through which liquid carbon dioxide introduced through the inlet pipe flows in a zigzag pipe; a cooling unit disposed in contact with the cooling pipe so that heat exchange occurs on the outer surface of the cooling pipe; a storage tank provided on the lower part of the casing, into which crystalline dry ice formed through the cooling pipe is introduced; and an injection nozzle for injecting the crystalline dry ice supplied from the storage tank into the carbon dioxide injection port.

[0020] The above cooling unit may be configured to include: an endothermic part in contact with the cooling pipe; a semiconductor thermoelectric element coupled to the outside of the endothermic part; and a heat dissipation part coupled to the outside of the semiconductor thermoelectric element.

[0022] In addition, the carbon dioxide supply unit may further comprise a heat dissipation fan provided on the side wall of the casing to discharge the heat of the heat dissipation unit to the outside; and an auxiliary cooling unit for maintaining the coldness of the storage tank.

[0024] In addition, the present invention may further comprise a weighing scale for verifying the weight of the bomb; and a dry air injection module for injecting dry air into the injection nozzle.

[0026] At this time, the dry air injection module may be configured to include: a compressor that sucks in and compresses external air; a drying section connected to the compressor and forming dry air by removing moisture from the air compressed by the compressor; and a transfer channel connected to the drying section and transferring the dry air formed in the drying section to the injection nozzle.

[0028] In addition, the drying unit may be configured to include: a dehumidifying cooling unit connected to the compressor and configured to condense moisture in the air compressed by the compressor; and a moisture discharge unit connected to the dehumidifying cooling unit and configured to separate and discharge the condensed moisture.

[0029] The above drying unit may further include an adsorption unit accommodating one or more of silica gel, zeolite, and dry powder, and may be configured to adsorb and remove residual moisture in the air that has passed through the dehumidifying cooling unit.

[0031] In addition, the present invention is provided with two carbon dioxide supply units, so that crystalline dry ice can be injected alternately from the two carbon dioxide supply units.

[0033] In addition, the present invention further provides a CO2 carbonation mortar composition characterized by being mixed on-site using the above-described in-situ carbon dioxide carbonation mortar production plant. Effects of the invention

[0035] According to the present invention as described above, the following effects can be expected.

[0036] 1. Substantial carbon reduction effects can be achieved through carbon dioxide fixation in-situ.

[0037] According to the present invention, carbon dioxide is directly injected into mortar being mixed on-site in an in-situ carbon dioxide carbonation mortar production plant, thereby reacting with cement hydration products and becoming fixed within the mortar. Accordingly, by suppressing the emission of carbon dioxide to the outside and fixing it during the mortar manufacturing and construction processes, a substantial carbon reduction effect can be achieved.

[0038] 2. Injection efficiency and carbonation reaction efficiency can be improved by injecting carbon dioxide in the form of crystalline dry ice.

[0039] By converting liquid carbon dioxide into a crystalline dry ice state and injecting it, the loss of carbon dioxide due to evaporation can be reduced compared to when it is injected in a gaseous state, and reaction time within the mortar can be secured, thereby significantly improving the efficiency of the carbonation reaction.

[0040] 3. Strength enhancement can be achieved through the formation of a crystal structure inside the mortar due to the crystallization of carbon dioxide.

[0041] When crystalline dry ice is injected during the mortar mixing process, carbon dioxide reacts with cement hydration products to promote crystallization, thereby improving the initial and long-term strength of the mortar.

[0042] 4. As the strength of the mortar improves, the amount of cement used can be replaced or reduced, thereby achieving additional carbon reduction effects.

[0043] The present invention allows for a reduction in the amount of cement required to secure the same strength, which leads to a reduction in carbon dioxide emissions generated during the cement manufacturing process, thereby providing a dual carbon reduction effect along with the effect of carbon dioxide fixation.

[0044] 5. By providing two carbon dioxide supply units and injecting alternately, freezing and clogging of the injection nozzle can be effectively prevented.

[0045] By operating two carbon dioxide supply units alternately, problems such as freezing, clogging, and operational instability that may occur when crystalline dry ice is continuously supplied to a single injection nozzle can be effectively resolved. As a result, stable injection is possible even during long-term continuous operation, and stable mortar production is possible regardless of on-site construction conditions (conditions such as temperature and humidity).

[0046] 6. By injecting dry air, condensation and excessive cooling of the injection nozzle can be prevented.

[0047] By supplying air from which moisture has been removed to the injection nozzle through a dry air injection module, condensation and excessive cooling caused by moisture inside the injection nozzle can be prevented.

[0048] 7. The formation of negative pressure by dry air can maintain smooth airflow inside the injection nozzle.

[0049] By injecting dry air, negative pressure is formed inside the injection nozzle, facilitating the injection and transport of crystalline dry ice and preventing uneven injection or retention phenomena that may occur during the injection process.

[0050] 8. Crystallization of liquid carbon dioxide can be achieved without a refrigerant through a cooling structure using a thermoelectric element.

[0051] Through a cooling unit combining zigzag cooling pipes and thermoelectric elements, liquid carbon dioxide can be converted into crystalline dry ice without the need for a separate refrigerant system or large-scale refrigeration equipment.

[0052] 9. The compactness of the carbon dioxide supply unit can improve applicability to mobile silos and field facilities.

[0053] The volume and weight of the carbon dioxide supply unit can be reduced by a thermoelectric element-based structure that does not use refrigerants, making it easy to apply to on-site mortar production plants combined with mobile silos.

[0054] 10. Flexible installation and operation are possible depending on site conditions.

[0055] Thanks to its compact carbon dioxide supply unit and modular structure, it is easy to install and operate under various construction site conditions, and offers excellent versatility as it can be operated by installing only the carbon dioxide supply unit in existing mobile silos.

[0056] 11. A large amount of carbon reduction can be cumulatively realized in the floor plastering process specialized for the domestic construction environment.

[0057] The present invention can be applied to mortar used in large quantities in the floor plastering process, thereby enabling the cumulative realization of carbon reduction effects not only for a single household but also for the entire apartment complex construction unit.

[0058] 12. It is possible to proactively respond to future overseas carbon reduction schemes and incentive schemes.

[0059] This invention provides a technical foundation capable of responding to carbon reduction incentive schemes or environmental regulations implemented overseas in the future by simultaneously achieving carbon dioxide fixation and a reduction in cement usage.

[0060] 13. It is possible to produce high-value-added mortar that simultaneously achieves carbon reduction and structural performance improvement.

[0061] By simultaneously realizing environmental effects such as carbon reduction, performance improvement of mortar, and resource conservation, it is possible to produce high-value-added carbonated mortar that is competitive across the entire construction industry.

[0062] 14. By forming a carbon dioxide injection port at the transfer starting point, the conversion rate of carbon dioxide into mortar can be maximized.

[0063] Since a carbon dioxide injection port is positioned at the starting point of the transfer section, the injected carbon dioxide travels along the entire length of the transfer section together with the mortar, thereby increasing the residence time of the carbon dioxide and maximizing the opportunity for contact with the mortar. This suppresses the loss of carbon dioxide and enables uniform mixing and reaction, which in turn maximizes the rate at which carbon dioxide is converted into minerals within the mortar. Brief explanation of the drawing

[0065] [Fig. 1] illustrates an embodiment of an in-situ carbon dioxide carbonation mortar production plant according to the present invention. [Fig. 2] illustrates an example of a carbon dioxide supply unit according to the present invention. [Fig. 3] is an exploded perspective view illustrating an embodiment of the cooling unit of the present invention. [Fig. 4] schematically illustrates a dry air injection module according to the present invention. [Fig. 5] illustrates the state in which carbon dioxide is injected alternately from the injection nozzles of two carbon dioxide supply units. [Fig. 6] illustrates the state of moving and installing an in-situ carbon dioxide carbonation mortar production plant according to the present invention. [Fig. 7] illustrates a structure formed by reducing and expanding the cross-sectional area in the bending section of the cooling pipe of the present invention. Specific details for implementing the invention

[0066] The present invention relates to a carbonation mortar production plant for injecting captured carbon dioxide into mortar on-site, comprising: a silo (100) that accommodates dry mortar and is equipped with a discharge hopper (110) at the bottom; a receiving housing (210) into which dry mortar discharged through the discharge hopper (110) is fed, and in which a water supply port (211) and a carbon dioxide injection port (212) are formed at the starting point of the transfer, and a transfer screw (220) having screw blades (222) coupled along a rotating shaft (221) installed longitudinally inside the receiving housing (210); and a mixing housing (300) that is formed by continuously connecting a front end to one side of the transfer housing (200) and having a discharge port (311) formed at a rear end, and a shaft blade (320) having a plurality of blades (321) coupled along a rotating shaft (221) extended longitudinally inside the mixing housing (310). The present invention provides an "In-situ carbon dioxide carbonation mortar production plant" comprising: a bomb (400) in which carbon dioxide recovered by a capture process is stored as liquid carbon dioxide; and a carbon dioxide supply unit (500) that converts the liquid carbon dioxide introduced from the bomb (400) into a crystalline dry ice state and supplies it to the carbon dioxide inlet (212).

[0067] The mortar production plant of the present invention is based on a mobile silo (100) and has a structure in which the processes of supplying, watering, mixing, and discharging dry mortar are carried out continuously. During these processes, carbon dioxide is injected from the front section (transfer starting point) to induce a carbonation reaction inside the mortar. Unlike conventional factory-type carbonation facilities, this configuration is a structure that can be applied directly at a construction site and is particularly suitable for environments where a large amount of mortar is consumed on-site, such as in domestic floor plastering processes.

[0068] As described above, the present invention provides an in-situ carbon dioxide carbonation mortar production plant in which carbonation mortar is produced directly on-site.

[0070] Hereinafter, an in-situ carbon dioxide carbonation mortar production plant according to the present invention will be described with reference to the attached drawings.

[0072] [Fig. 1] illustrates an embodiment of an in-situ carbon dioxide carbonation mortar production plant according to the present invention.

[0074] The above silo (100) stores dry mortar mixed with cement and sand inside, and the present invention can be applied to all types of dry mortar, ranging from dry mortar simply mixed with cement and sand to dry mortar containing admixtures.

[0075] The above silo (100) is equipped with a discharge hopper (110) at the bottom for stably discharging dry mortar. The discharge hopper (110) may be formed in a funnel shape to guide the dry mortar downward by gravity.

[0076] The above transfer unit (200) may be configured to include a receiving housing (210) and a transfer screw (220) having screw blades (222) coupled along a rotation axis (221) installed longitudinally inside the receiving housing (210).

[0077] A water supply port (211) and a carbon dioxide injection port (212) may be formed in the receiving housing (210) of the above-mentioned transfer unit (200). The water supply port (211) and the carbon dioxide injection port (212) may be installed spaced apart so as not to interfere with each other's discharge directions. Since sublimation is promoted when water comes into contact with crystalline dry ice, it is desirable to space the water supply port (211) and the carbon dioxide injection port (212) apart so as not to interfere with each other. Accordingly, if necessary, a barrier wall may be installed between the water supply port (211) and the carbon dioxide injection port (212) to minimize interference between them.

[0078] Additionally, it is preferable that the water supply port (211) and the carbon dioxide injection port (212) be installed on the upper part of the receiving housing (210) so that they are naturally injected by gravity. In [Fig. 1], the carbon dioxide injection port (212) is positioned apart from the discharge hopper (110) for better understanding, but it is preferable that the carbon dioxide injection port (212) be positioned at the innermost part of the transfer starting point to maximize the transfer time of the carbon dioxide. Accordingly, the carbon dioxide injection port (212) can be positioned at the transfer starting point of the transfer section (200) so that the injected carbon dioxide moves along the entire section of the transfer section (200) together with the mortar. As a result, the residence time of the carbon dioxide increases and the opportunity for contact with the mortar is maximized, thereby suppressing the loss of carbon dioxide and enabling uniform mixing and reaction, which can maximize the rate at which the carbon dioxide is converted into minerals inside the mortar.

[0080] Carbon dioxide can exist in gaseous, liquid, and solid states. Gaseous carbon dioxide has high diffusivity, resulting in a short residence time within the mortar and a low reaction participation rate. In contrast, liquid carbon dioxide supplied by the bomb (400) rapidly vaporizes due to a pressure drop upon injection, which limits the contribution of only a portion to the reaction. In comparison, dry ice is in a solid state and supplies carbon dioxide through a sublimation process, which has the advantage of increasing the reaction time; however, dry ice in the form of general lumps has a limited surface area, which may result in non-uniform reaction efficiency. The crystalline dry ice applied in the present invention is formed in the form of fine particles, which significantly increases the specific surface area and allows for uniform dispersion within the mortar. Furthermore, carbon dioxide is gradually released during the sublimation process, and the carbon dioxide generated during this process dissolves in the moisture within the mortar and directly participates in the carbonation reaction, thereby improving reaction efficiency. Accordingly, when using crystalline dry ice, the reaction efficiency is significantly improved compared to gaseous or liquid carbon dioxide, and the utilization rate of carbon dioxide within the mortar can be maximized.

[0082] As illustrated in [Fig. 1], dry mortar discharged through the discharge hopper (110) is introduced into the receiving housing (210) of the conveying unit (200), water is injected through the water supply port (211), and crystalline dry ice is injected through the carbon dioxide injection port (212). At this time, the mortar (hereinafter referred to as mixed mortar) mixed with the introduced mortar, water, and crystalline dry ice is conveyed while being mixed in one direction by the conveying screw (220) located inside the receiving housing (210).

[0083] The above-mentioned conveying screw (220) is configured such that screw blades (222) are coupled along a rotation axis (221) installed longitudinally inside the receiving housing (210), and conveys the mixed mortar in one direction according to rotation inside the receiving housing (210).

[0084] In summary, as the conveying screw (220) rotates, the dry mortar is conveyed together with water supplied through the water supply port (211) and simultaneously comes into contact with crystalline dry ice supplied through the carbon dioxide injection port (212). At this time, since the injection of crystalline dry ice in the conveying section (200) takes place before the mortar is completely mixed, it provides a basis for the crystalline dry ice to be dispersed throughout the entire mixing section.

[0086] The front end of the mixing unit (300) is formed by being continuously connected to one side of the conveying unit (200), and the rear end may be configured to include a mixing housing (310) having an outlet (311) formed therein and a shaft blade (320) having a plurality of blades (321) coupled along a rotation axis (221) extending longitudinally inside the mixing housing (310).

[0087] The above-mentioned rotating shaft (221) is formed as an extension from the above-mentioned transfer unit (200), receives rotational force from the drive motor and rotates, and is efficient as it can simultaneously rotate the transfer screw (220) and the shaft blade (320).

[0088] The above blades (321) are arranged in multiple protrusions along the outer surface of the rotation axis (221) and rotate together with the rotation axis (221) to mix the mixed mortar delivered from the conveying unit (200).

[0089] The front end of the mixing housing (310) is formed by being continuously connected to one side of the conveying unit (200), and the rear end may have a discharge port (311) formed therein for discharging the mixed mortar after mixing is complete. The discharge port (311) may be provided at the rear end of the mixing housing (310) or formed on the lower side of the rear end.

[0090] The above-mentioned bomb (400) stores carbon dioxide from the atmosphere after it has been recovered through a capture process and compressed into a liquid state, and can be configured to supply liquid carbon dioxide to an external device while maintaining a pressure of approximately 50 to 55 bar. Therefore, continuous supply of liquid carbon dioxide is possible without a separate compressor (610) due to the pressure formed in the above-mentioned bomb (400). As described above, since the captured carbon dioxide is compressed and stored in the bomb (400), the volume of the captured carbon dioxide can be reduced for storage and transportation, and it can be installed without being affected by the area or shape of the installation site.

[0091] Through the above process, the present invention directly utilizes the captured carbon dioxide, thereby realizing a carbon cycle structure rather than the simple use of carbon dioxide gas.

[0092] The carbon dioxide supply unit (500) can convert liquid carbon dioxide introduced from the bomb (400) into a crystalline dry ice state and supply it to the carbon dioxide injection port (212). The carbon dioxide supply unit (500) supplies crystalline dry ice into the receiving housing (210) of the transfer unit (200), so that the CO2 gas generated as the crystalline dry ice uniformly mixed in the mortar sublimes is released from the Ca2 released during the cement hydration process. + CO2 can be permanently fixed in the form of calcium carbonate (CaCO3) through a CO2 carbonation reaction with ions. At this time, the fixed calcium carbonate (CaCO3) is in a nano-sized crystalline form and can contribute to improving the strength of the final product, carbonated mortar, by filling the voids between the mixed cements.

[0094] The carbon dioxide supply unit (500) may be configured to include: a casing (510) connected to the bomb (400) through an inlet pipe (410); a cooling pipe (520) provided on the upper part of the casing (510) through which liquid carbon dioxide introduced through the inlet pipe (410) flows in a zigzag pipe; a cooling unit (530) arranged to allow heat exchange on the outer surface of the cooling pipe (520); a storage tank (540) provided on the lower part of the casing (510) through which crystalline dry ice formed via the cooling pipe (520) is introduced; and an injection nozzle (550) that injects the crystalline dry ice supplied from the storage tank (540) into the carbon dioxide injection port (212).

[0095] [Fig. 2] illustrates an example of a carbon dioxide supply unit (500) according to the present invention.

[0097] The carbon dioxide supply unit (500) includes a casing (510) connected to a bomb (400) and an inlet pipe (410), and a zigzag cooling pipe (520) through which liquid carbon dioxide flows is provided on the upper part of the casing (510).

[0098] In particular, the cooling pipe (520) is configured in a zigzag shape to increase the length of the flow path, thereby extending the residence time of the liquid carbon dioxide and ensuring sufficient cooling time to induce a stable phase change. Additionally, as the direction of fluid flow changes repeatedly, heat transfer is enhanced by the formation of turbulence, which alleviates excessive local temperature drop and improves the heat transfer efficiency between the inner wall of the cooling pipe (520) and the liquid carbon dioxide, thereby preventing freezing and blockage caused by local rapid cooling. Furthermore, as cooling occurs gradually along the zigzag flow path, the same cooling length can be achieved within a limited space, thereby improving the miniaturization of the device and its applicability to mobile equipment. In other words, the cooling pipe (520) is configured to enhance the function of maintaining the liquid carbon dioxide in a liquid state without vaporizing it.

[0100] Accordingly, the carbon dioxide supply unit (500) of the present invention can be configured so that liquid carbon dioxide naturally transitions into a solid state under temperature and pressure control conditions when flowing. Specifically, as the liquid carbon dioxide moves along a cooling pipe (520) formed as a zigzag pipe and passes through a pressure reduction unit (580), some of the liquid carbon dioxide may undergo a phase change into a solid state due to heat exchange, where the temperature is lowered and the pressure is changed. The solid carbon dioxide generated at this time may be formed in the form of fine particles. In particular, as the liquid carbon dioxide flows in a uniformly dispersed state due to flow dispersion and temperature gradient within the cooling pipe (520), conditions for a solid phase change are formed, thereby creating an environment in which it can be converted into and maintained as crystalline carbon dioxide in the form of fine particles.

[0101] In order for carbon dioxide to undergo a phase change from a liquid to a solid (dry ice), conditions for a decrease in pressure and a decrease in temperature must be created to induce a state where the liquid phase cannot be maintained near the triple point conditions (-56.6°C, 5.18 bar) and is converted into a solid.

[0102] In the present invention, in order to induce conversion to a solid as described above, the cooling pipe (520) is configured in a zigzag shape to increase the length of the flow path and extend the residence time of the liquid carbon dioxide, thereby ensuring sufficient cooling through heat exchange. Additionally, the fluid flow is dispersed and heat transfer efficiency is improved by the repeated change of direction of the cooling pipe (520), and accordingly, the temperature of the liquid carbon dioxide can be gradually lowered.

[0103] In addition, as the cooling pipe (520) is formed in a zigzag shape, the direction of fluid flow changes repeatedly, increasing friction loss and local loss, which can induce a pressure drop. As the pressure change and temperature drop during the flow process act in combination, a portion of the liquid carbon dioxide naturally undergoes a phase change to a solid state, and the solid carbon dioxide formed at this time can be uniformly distributed in the form of fine particles due to the flow dispersion effect. In particular, because the generation of solid carbon dioxide is not concentrated in a specific section but occurs gradually throughout the entire flow path due to the zigzag flow path, it can be formed in a crystalline state with relatively uniform particle size.

[0104] However, in a situation where the supply pressure of the above-mentioned bomb (400) is about 50 to 55 bar, there may be limitations in securing a pressure drop sufficient to induce a pressure drop for dry ice generation conditions solely through the pressure loss occurring at the bend (521) of the zigzag pipe.

[0105] Accordingly, in the present invention, as shown in [Fig. 7], the cross-section of the bending part (521) of the cooling pipe (520) can be reduced to induce the expansion of carbon dioxide.

[0106] As illustrated in [Fig. 7], each bend (521) of the cooling pipe (520) may be composed of a contraction section in which the cross-sectional area of ​​the flow path is reduced, and an expansion section in which the cross-sectional area is expanded again in succession to the contraction section. At this time, depending on the situation, the cross-sectional area of ​​the entire bend (521) of the cooling pipe (520) may be reduced, or only a part of it may be reduced.

[0107] If the cross-sectional area of ​​the entire bending section (521) is reduced, the flow velocity of liquid carbon dioxide increases in the reduced section according to the Bernoulli principle, thereby inducing a localized pressure drop, and in the expanded section, irreversible expansion occurs along with a decrease in flow velocity, which may result in an additional temperature drop due to the Joule-Thomson (JT) effect. As such a reduction-expansion structure is repeatedly formed throughout the entire length of the zigzag cooling pipe (520), the effect of accumulating pressure drop and temperature drop is realized each time it passes through each bending section (521).

[0108] In the above case, within the cooling pipe (520), external cooling by the cooling section (530), internal pressure drop and Joule-Thomson cooling effect caused by the contraction-expansion structure of each bending section (521) act in combination. That is, when the temperature of the liquid carbon dioxide is sufficiently lowered by the cooling section (530), additional pressure drop and temperature drop caused by the contraction-expansion structure of each bending section (521) are repeatedly superimposed, thereby gradually approaching the triple point condition of carbon dioxide. In this process, the local pressure drop occurring at the moment of passing through the contraction section of each bending section (521) induces the formation of carbon dioxide crystals, and crystal growth is promoted by irreversible expansion in the expansion section. As this crystal growth process is repeated stepwise throughout the entire zigzag flow path, crystalline dry ice microparticles with uniform particle size can be formed. Furthermore, unlike methods in which a pressure drop occurs only once at a specific point, such as with a simple straight orifice or expansion valve, the contraction-expansion structure of the zigzag cooling pipe (520) has structural characteristics in which the pressure drop and temperature drop occur gradually and cumulatively across multiple bends (521). Accordingly, unevenness in crystal size and freezing / clogging within the pipe caused by abrupt phase changes in specific sections are prevented, and crystalline dry ice can be generated in the form of fine particles uniformly dispersed throughout the entire section of the cooling pipe (520), thereby enabling stable supply through the storage tank (540) and injection nozzle (550).

[0110] The crystalline dry ice formed through the above process may exist in the form of a slurry mixed with liquid carbon dioxide, and the slurry state can be transported in a state where vaporization is suppressed by containing solid carbon dioxide while maintaining viscous fluidity. Accordingly, the crystalline dry ice is stably supplied to the injection nozzle (550), and the phase change of carbon dioxide into a gaseous state during the injection process can be minimized.

[0112] In addition, in the present invention, to account for cases where the cooling pipe (520) alone cannot achieve a sufficient pressure reduction required for the phase change of carbon dioxide, a pressure reduction unit (580) for reducing the pressure of liquid carbon dioxide to a target level may be additionally provided at the front or rear end of the cooling pipe (520). In particular, it is preferable that the pressure reduction unit (580) be positioned at the rear end of the cooling pipe (520), because if the pressure reduction occurs when the liquid carbon dioxide is sufficiently cooled, the solid phase change can be induced more easily. Furthermore, it is preferable to position the pressure reduction unit at the rear end of the cooling pipe so that a stable flow of liquid carbon dioxide is maintained inside the cooling pipe, thereby improving heat exchange efficiency.

[0114] The above-mentioned pressure reduction unit (580) may be configured to induce a phase change of carbon dioxide into crystalline dry ice by adiabatic expansion by rapidly or stepwise reducing the pressure before supplying liquid carbon dioxide, which has been sufficiently cooled by the cooling unit (530) while passing through the cooling pipe (520), to the storage tank (540). The above-mentioned pressure reduction unit (580) may be composed of one or more of an expansion valve, an orifice structure, and a needle valve.

[0115] The above expansion valve can actively control the flow rate of liquid carbon dioxide and the degree of pressure drop by adjusting the opening degree. When an electronic expansion valve (EEV) is applied, the amount of pressure reduction can be adjusted in real time in conjunction with the control unit according to the supply pressure of the cylinder (400) and the temperature and pressure conditions inside the cooling pipe (520). Accordingly, stable crystalline dry ice generation becomes possible regardless of external factors such as seasonal temperature changes or changes in on-site environmental conditions.

[0116] The above orifice structure is a structure that rapidly reduces the cross-sectional area of ​​the flow path. As liquid carbon dioxide passes through the orifice, the flow velocity increases rapidly, causing a pressure drop. Immediately after passing through the orifice, the flow path expands again, causing irreversible adiabatic expansion and a rapid decrease in the temperature of the carbon dioxide. The diameter and length of the orifice can be pre-set considering the required amount of pressure reduction and the size of the dry ice particles. The needle valve has the advantage of allowing for fine adjustment of the amount of pressure reduction relative to the orifice by finely changing the effective cross-sectional area of ​​the flow path by adjusting the insertion depth of the needle-shaped valve core. Accordingly, the amount of pressure reduction can be manually or automatically adjusted in response to changes in supply pressure due to the decrease in the remaining amount of the bomb (400) or changes in on-site temperature conditions.

[0118] Liquid carbon dioxide flows along the cooling pipe (520) and is cooled, thereby changing into crystalline dry ice. At the bottom of the casing (510), a storage tank (540) is provided for receiving and storing the crystalline dry ice formed through the cooling pipe (520), and the crystalline dry ice stored in the storage tank (540) is supplied to the carbon dioxide injection port (212) through the injection nozzle (550).

[0119] As described above, by temporarily storing crystalline dry ice in the storage tank (540) and then injecting it, the injection timing and injection amount can be stably controlled.

[0121] The above cooling pipe (520) may be configured to have a heat exchanger on the outside through which a refrigerant circulates, and the refrigerant may absorb heat while circulating along the outer circumference of the cooling pipe (520) to cool the liquid carbon dioxide flowing inside.

[0122] In addition, the cooling pipe (520) can perform cooling by applying a semiconductor thermoelectric element (532). In this case, a separate refrigerant circulation system, such as a refrigerant storage tank, circulation pipe, and compressor, is not required, so the configuration of the device can be simplified. Furthermore, the cooling method using a thermoelectric element allows for precise temperature control through electrical control, is free from refrigerant leakage or maintenance issues, and can reduce the volume and weight of the entire system, making it easy to miniaturize. Accordingly, it can be easily combined with field application equipment such as a mobile silo (100), and the mobility and ease of installation of the device can be improved, making it desirable to apply to the present invention.

[0124] [Fig. 3] is an exploded perspective view illustrating an embodiment of the cooling unit (530) of the present invention.

[0125] The above cooling unit (530) may be configured to include: an absorption unit (531) in contact with the cooling pipe (520); a semiconductor thermoelectric element (532) coupled to the outside of the absorption unit (531); and a heat dissipation unit (533) coupled to the outside of the semiconductor thermoelectric element (532).

[0126] The above semiconductor thermoelectric element (532) absorbs heat from the heat absorption side (531) and releases heat to the heat dissipation side (533) when power is applied, thereby effectively cooling the liquid carbon dioxide inside the cooling pipe (520).

[0127] The above semiconductor thermoelectric element (532) may be a thermoelectric element such as a Peltier device.

[0128] The heat absorption portion (531) is positioned in close contact with the outer surface of the cooling pipe (520), and the portion in contact with the cooling pipe (520) may be formed in a corrugated or uneven shape to increase the contact area, thereby allowing heat from the cooling pipe (520) to be absorbed more efficiently. Additionally, the heat absorption portion (531) may be formed of a metal material with excellent thermal conductivity to improve the heat transfer efficiency with the thermoelectric element.

[0129] In addition, the heat dissipation part (533) is coupled to the outside of the semiconductor thermoelectric element (532) and can be configured to have a fin structure with a plurality of heat dissipation fins protruding outwardly to increase the contact area with air, thereby rapidly releasing heat transferred from the thermoelectric element to the outside to improve heat dissipation efficiency.

[0131] Since such a thermoelectric element-based structure does not require a refrigerant or a large refrigeration unit, the carbon dioxide supply unit (500) can be configured compactly, and the miniaturization and mobility are greatly improved.

[0133] Additionally, the carbon dioxide supply unit (500) may further include a heat dissipation fan (560) provided on the side wall of the casing (510) to discharge the heat of the heat dissipation unit (533) to the outside.

[0134] A heat dissipation fan (560) is further provided on the outer side of the heat dissipation part (533) to promote airflow around the heat dissipation fins by forcing external air to flow, thereby allowing the heat transferred from the thermoelectric element to be released to the outside more quickly, and thus improving the overall cooling performance.

[0136] In addition, it may be configured to further include an auxiliary cooling unit (570) for maintaining the coldness of the storage tank (540).

[0137] The above auxiliary cooling unit (570) delays the phase change of crystalline dry ice, enabling stable storage and preventing a decrease in injection efficiency.

[0138] The auxiliary cooling unit (570) may be configured to be in contact with the outer surface of the storage tank (540) to block heat entering from the outside or to maintain the cold air inside the storage tank (540), and may include an insulating material or a double-wall structure to minimize heat transfer. Additionally, the auxiliary cooling unit (570) may be configured to release heat to the outside of the storage tank (540) by applying a metal material that facilitates heat transfer to the outside of the storage tank (540) or by including a heat dissipation structure to enable heat exchange with air. Furthermore, the auxiliary cooling unit (570) may form an insulating layer between the storage tank (540) and the external environment, or include a multi-layer insulating structure or an air layer to suppress the inflow of external heat, thereby maintaining a low internal temperature state for a long time, which delays the phase change of crystalline dry ice and maintains a stable storage state.

[0140] Additionally, the present invention may further comprise a weighing scale (420) for checking the weight of the bomb (400); and a dry air injection module (600) for injecting dry air into the injection nozzle (550).

[0141] As described above, the amount of carbon dioxide injected can be precisely managed through the weighing scale (420), and the injection of dry air prevents condensation and freezing of the nozzle.

[0142] As described above, by measuring the amount of carbon dioxide input in real time through the weighing scale (420), the amount of carbon dioxide injected can be precisely controlled according to the set supply amount.

[0143] In addition, the dry air injection module (600) can generate dry air with a low dew point by removing moisture from compressed air and supplying it into the injection nozzle (550), thereby suppressing moisture condensation inside the injection nozzle (550). Accordingly, condensation and freezing phenomena that may occur during the process of injecting low-temperature carbon dioxide are prevented, and the attachment or aggregation of dry ice inside the injection nozzle (550) is suppressed, thereby preventing nozzle clogging.

[0144] Furthermore, a constant airflow is formed inside the injection nozzle (550) by the continuous injection of dry air, and as a result, a local negative pressure is formed inside the injection nozzle (550), so that the suction and spray flow of crystalline dry ice can be induced more smoothly by said negative pressure. More specifically, a change in flow velocity is formed inside the injection nozzle (550) by the inflow of dry air, and accordingly, a local pressure drop is induced so that the inflow and spray flow of carbon dioxide can be maintained smoothly. Accordingly, the spray flow of crystalline dry ice is maintained stably, and spray unevenness or retention phenomena that may occur during the injection process are prevented, and clogging of the injection nozzle (550) due to dry ice residue or aggregation can also be effectively suppressed. In particular, since the present invention applies crystalline dry ice, which is prone to clogging of the injection nozzle (550) during the aggregation or sublimation process, when dry air from which moisture has been removed is injected as described above, moisture condensation and freezing inside the nozzle are effectively suppressed, and accordingly, the attachment or aggregation of crystalline dry ice is prevented, so that the clogging of the injection nozzle (550) can be significantly reduced.

[0146] [Fig. 4] schematically illustrates a dry air injection module (600) according to the present invention.

[0147] The above dry air injection module (600) may be configured to include: a compressor (610) that sucks in and compresses external air; a drying section (620) connected to the compressor (610) and forming dry air by removing moisture from the air compressed by the compressor (610); and a transfer path (630) connected to the drying section (620) and transferring the dry air formed in the drying section (620) to the injection nozzle (550).

[0148] The above compressor (610) can be configured to draw in external air to generate compressed air at a set pressure, and to cause an increase in the temperature and moisture content of the air during the compression process.

[0149] The above drying unit (620) may be configured to remove moisture from the air compressed by the compressor (610) to form dry air with a low dew point.

[0150] The above transfer channel (630) is a channel that guides the drying air generated through the drying unit (620) toward the injection nozzle (550), ensuring that the drying air is stably supplied into the nozzle, and may further include a valve or a control unit that controls the flow rate and pressure as needed.

[0152] The above drying unit (620) may be configured to include a dehumidifying cooling unit (621) that cools high-temperature and high-humidity compressed air supplied from the compressor (610) to condense moisture, a moisture discharge unit (622) that separates and discharges moisture condensed in the dehumidifying cooling unit (621), and an adsorption unit (623) that adsorbs and removes residual moisture, thereby forming dry air with a low dew point.

[0154] That is, moisture in the air is effectively removed through a stepwise drying process in which moisture is condensed and separated by cooling of compressed air, and then the remaining moisture is adsorbed and removed. Accordingly, dry air with a low dew point is formed, and the occurrence of condensation and freezing inside the injection nozzle (550) can be fundamentally suppressed.

[0155] As described above, a stable supply of dry air with moisture removed is possible through a multi-stage drying structure consisting of “cooling → condensation → (moisture) separation → (moisture) adsorption.”

[0157] In addition, the present invention is provided with two carbon dioxide supply units (500), so that crystalline dry ice can be injected alternately from the two carbon dioxide supply units (500).

[0158] [Fig. 5] illustrates the state in which carbon dioxide is alternately injected from the injection nozzles (550) of two carbon dioxide supply units (500).

[0159] To this end, the two carbon dioxide supply units (500) each include a first and a second supply valve that is controlled independently, and the supply valves can be simultaneously controlled by a separate electronic control unit (not shown). The control unit may be configured to variably control the amount of carbon dioxide injected from the two carbon dioxide supply units (500) by adjusting the opening and closing timing and the opening rate of the first supply valve and the second supply valve, thereby enabling the effect of alternately injecting crystalline dry ice from each carbon dioxide supply unit (500). For example, the control unit may control the amount of injection from the first carbon dioxide supply unit (500) by gradually decreasing it while simultaneously gradually increasing the amount of injection from the second carbon dioxide supply unit (500'), thereby enabling the continuous switching from one carbon dioxide supply unit (500) to another carbon dioxide supply unit (500). In this way, by performing overlapping control while the two carbon dioxide supply units (500) are not completely blocked, the flow of crystalline dry ice supplied to the injection nozzle (550) can be maintained without interruption. Alternatively, the flow of crystalline dry ice can be maintained without interruption by controlling the injection of crystalline dry ice to the second carbon dioxide supply unit (500') without time delay while the first carbon dioxide supply unit (500) is completely blocked.

[0160] Additionally, the control unit can adjust the injection ratio of each supply unit in real time based on a signal from a sensor detecting the temperature, pressure, or flow rate inside the injection nozzle (550), and can control the supply unit by reducing the opening rate of the supply unit and increasing the opening rate of the other carbon dioxide supply unit (500') when freezing or a decrease in flow rate is detected in a specific carbon dioxide supply unit (500). The supply valve can be configured as an electronic solenoid valve or a proportional control valve to precisely control the injection flow rate, and can further include a check valve for backflow prevention to prevent interference between each supply unit if necessary. Accordingly, even when crystalline dry ice is continuously supplied to a single injection nozzle (550), local freezing or blockage in a specific carbon dioxide supply unit (500) can be prevented, and a stable injection state can be maintained even during long-term continuous operation.

[0161] Therefore, when the above structure is applied as an alternating injection structure in two carbon dioxide supply units (500), freezing and clogging that may occur when crystalline dry ice is continuously supplied to one injection nozzle (550) can be prevented, and continuous operation for a long time can be enabled.

[0163] As described above, local freezing and retention in a specific carbon dioxide supply unit (500) are alleviated by the alternating injection of the carbon dioxide supply unit (500) as described above, and moisture condensation and freezing inside the injection nozzle (550) are suppressed by the injection of dry air. Thus, the two actions work complementarily to more effectively prevent clogging of the injection nozzle (550) and maintain a stable crystalline dry ice injection state. Accordingly, the synergy effect between the alternating injection of the carbon dioxide supply unit (500) and the supply of dry air to the injection nozzle (550) can be enhanced.

[0165] [Fig. 6] illustrates the state of moving and installing an in-situ carbon dioxide carbonation mortar production plant according to the present invention.

[0166] The silo (100) according to the present invention may be configured to have a coupling groove formed on its upper surface, and the coupling groove is formed to be coupled with a dedicated vehicle for movement. The dedicated vehicle may be configured to allow the cargo compartment to be raised and tilted, and a coupling projection corresponding to the coupling groove may be formed protruding from one side of the cargo compartment. When moving, the silo (100) and the vehicle are mechanically coupled by inserting the coupling projection into the coupling groove on the upper surface of the silo (100) while the cargo compartment of the vehicle is raised, and then the cargo compartment is lowered back to a horizontal state so that the in-situ carbon dioxide carbonation mortar production plant of the present invention, including the silo (100), can be stably loaded onto the vehicle.

[0167] Upon arrival at the site, the above procedure is reversed to erect the cargo compartment of the dedicated vehicle and erect the In-situ carbon dioxide carbonation mortar production plant, and the silo (100) can be simply installed by separating the connecting groove and connecting projection on the top. [Fig. 6] (b) shows the state in which the cargo compartment of the dedicated vehicle is erected to erect the In-situ carbon dioxide carbonation mortar production plant and the carbon dioxide supply unit (500) is connected.

[0168] In this way, the in-situ carbon dioxide carbonation mortar production plant can be combined and loaded by simply standing and rotating the cargo bed of a vehicle without a separate crane, making it easy to move and install at the site and improving work efficiency. Meanwhile, the carbon dioxide supply unit (500) is configured with a modular structure that is separable from the in-situ carbon dioxide carbonation mortar production plant, so that when moving, it can be separated and loaded together on the vehicle or loaded in a separate space. Accordingly, the load is distributed during the movement of the in-situ carbon dioxide carbonation mortar production plant, damage to the carbon dioxide supply unit (500) is prevented, and rapid reassembly is possible after arrival at the site, thereby improving the mobility and operational efficiency of the entire system.

[0169] In particular, the carbon dioxide supply unit (500) of the present invention utilizes a cooling structure using a semiconductor thermoelectric element (532), thereby eliminating the need for a separate refrigerant storage device or large-scale refrigeration equipment, which enables the overall device to be miniaturized and lightweight. Accordingly, it is easy to transport the in-situ carbon dioxide carbonation mortar production plant by loading it onto a vehicle, thereby further improving its applicability to the field.

[0171] In addition, the present invention further provides a CO2 carbonation mortar composition characterized by being mixed on-site using the above-described in-situ carbon dioxide carbonation mortar production plant.

[0172] The mortar composition produced by applying the above-mentioned in-situ carbon dioxide carbonation mortar production plant possesses both environmental benefits resulting from carbon dioxide fixation and technical advantages such as improved strength and reduced cement usage.

[0174] The present invention has been described in detail above with specific embodiments. However, the present invention is not limited by the above embodiments and may be modified and varied within the scope without departing from the essence of the invention. Accordingly, the claims of the present invention include such modifications and variations. Explanation of the symbols

[0176] 100 : Silo 110 : Discharge hopper 200 : Transfer section 210 : Accommodation Housing 211: Water inlet 212: Carbon dioxide inlet 220 : Feed screw 221 : Rotating shaft 222 : Screw blade 300 : Mixing section 310 : Mixed housing 311 : Outlet 320 : Shaft blade 321 : Blade 400 : Bombe 410: Inlet pipe 420: Weighing scale 500 : Carbon dioxide supply unit 510 : Casing 520 : Cooling pipe 521 : Regulator 530 : Cooling unit 531 : Heat absorption section 532 : Semiconductor thermoelectric element 533 : Heat dissipation section 540 : Storage tank 550 : Injection nozzle 560 : Cooling fan 570 : Auxiliary cooling unit 580 : Pressure reduction section 600 : Dry air injection module 610 : Compressor 620 : Drying section 621: Dehumidification cooling unit 622: Moisture discharge unit 623 : Adsorption part 630 : Transfer route

Claims

Claim 1 A carbonation mortar production plant for injecting captured carbon dioxide into mortar on-site, comprising: a silo (100) that accommodates dry mortar and is equipped with a discharge hopper (110) at the bottom; a receiving housing (210) into which the dry mortar discharged through the discharge hopper (110) is fed, and in which a water supply port (211) and a carbon dioxide injection port (212) are formed at the starting point of the transfer, and a transfer screw (220) having screw blades (222) coupled along a rotating shaft (221) installed longitudinally inside the receiving housing (210); a mixing housing (300) that is formed by a front end continuously connected to one side of the transfer housing (200) and a rear end having a discharge port (311), and a shaft blade (320) having a plurality of blades (321) coupled along a rotating shaft (221) extended longitudinally inside the mixing housing (310); and a collection process A cylinder (400) in which the recovered carbon dioxide is stored as liquid carbon dioxide; and a carbon dioxide supply unit (500) that converts the liquid carbon dioxide introduced from the cylinder (400) into a crystalline dry ice state and supplies it to the carbon dioxide inlet (212); wherein the carbon dioxide supply unit (500) comprises: a casing (510) connected to the cylinder (400) through an inlet pipe (410); a cooling pipe (520) provided on the upper part of the casing (510) and formed as a zigzag pipe having a plurality of bending sections (521) to allow the liquid carbon dioxide introduced through the inlet pipe (410) to flow; a cooling section (530) disposed in contact with the cooling pipe (520) so that heat exchange is performed on the outer surface of the cooling pipe (520); and a storage tank (540) provided on the lower part of the casing (510) into which the crystalline dry ice formed through the cooling pipe (520) is introduced. and an injection nozzle (550) for injecting crystalline dry ice supplied from the storage tank (540) into the carbon dioxide injection port (212);An in-situ carbon dioxide carbonation mortar production plant comprising, wherein each bend (521) of the cooling pipe (520) is composed of a contracting section in which the cross-sectional area of ​​the flow path is reduced and an expanding section in which the cross-sectional area is expanded again in succession to the contracting section. Claim 2 delete Claim 3 In the first paragraph, the cooling section (530) is characterized by comprising: an absorption section (531) in contact with the cooling pipe (520); a semiconductor thermoelectric element (532) coupled to the outside of the absorption section (531); and a heat dissipation section (533) coupled to the outside of the semiconductor thermoelectric element (532). Claim 4 In paragraph 3, the carbon dioxide supply unit (500) is further configured to include a heat dissipation fan (560) provided on the side wall of the casing (510) to discharge heat from the heat dissipation unit (533) to the outside; an in-situ carbon dioxide carbonation mortar production plant. Claim 5 In the first paragraph, the carbon dioxide supply unit (500) is further configured to include an auxiliary cooling unit (570) for maintaining the coldness of the storage tank (540); an in-situ carbon dioxide carbonation mortar production plant. Claim 6 An in-situ carbon dioxide carbonation mortar production plant characterized by further comprising, in claim 1, a weighing scale (420) for checking the weight of the bomb (400). Claim 7 An in-situ carbon dioxide carbonation mortar production plant characterized by further comprising, in claim 1, a dry air injection module (600) for injecting dry air into the injection nozzle (550). Claim 8 In claim 7, the drying air injection module (600) comprises: a compressor (610) that sucks in and compresses external air; a drying section (620) connected to the compressor (610) and forming dry air by removing moisture from the air compressed by the compressor (610); and a transfer channel (630) connected to the drying section (620) and transferring the dry air formed in the drying section (620) to the injection nozzle (550). In-situ carbon dioxide carbonation mortar production plant. Claim 9 In claim 8, the drying unit (620) is characterized by comprising: a dehumidifying cooling unit (621) connected to the compressor (610) and configured to condense moisture in the air compressed by the compressor (610); and a moisture discharge unit (622) connected to the dehumidifying cooling unit (621) and configured to separate and discharge the condensed moisture. Claim 10 In claim 9, the drying section (620) further comprises an adsorption section (623) that accommodates one or more of silica gel, zeolite, and dry powder; and is configured to adsorb and remove residual moisture in the air that has passed through the dehumidifying cooling section (621), characterized in that it is an in-situ carbon dioxide carbonation mortar production plant. Claim 11 An in-situ carbon dioxide carbonation mortar production plant according to claim 1, characterized in that two carbon dioxide supply units (500) are provided, and crystalline dry ice is alternately injected from the two carbon dioxide supply units (500). Claim 12 A carbon dioxide carbonation mortar composition characterized by being mixed on-site using an in-situ carbon dioxide carbonation mortar production plant according to any one of claims 1 and 3 to 11.

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