Aggregate cooling system and method

Abstract

According to the aggregate cooling system and method, a carbon dioxide circulation mechanism and an aggregate stirring tank are adopted for heat exchange, a large amount of latent heat released in the gasification process of liquid carbon dioxide is fully utilized, the temperature of concrete aggregate can be rapidly reduced, and therefore the concrete aggregate is rapidly cooled, and dynamic mixing of a stirring device is matched; meanwhile, the carbon dioxide circulating mechanism is matched with the refrigerant circulating mechanism and the cooling water circulating mechanism to carry out multi-stage heat exchange, a closed circulating system is formed, efficient recycling and cyclic utilization of carbon dioxide are achieved, dependence on water resources is reduced, and therefore the cooling efficiency is improved; the operation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete engineering, and particularly relates to a cooling system for concrete aggregates. Background Art

[0002] In dam construction, the amount of concrete used is huge and the temperature control requirements are extremely strict. The temperature of the concrete mixture will directly affect the heat release rate during its hardening process and the internal temperature difference of the structure. If the initial temperature of the concrete is too high, it is easy to cause cracks inside the dam structure, affecting its strength and durability. Therefore, large-scale concrete projects especially need to control the initial temperature of the concrete, and the pre-cooling of aggregates is the key link to control the initial temperature.

[0003] Existing technologies often use methods such as water cooling, air cooling, ice block cooling, and liquid nitrogen cooling for aggregate cooling. The Chinese patent with the publication number CN 222406513 U discloses a concrete pre-cooling system. The pre-cooling system includes a refrigeration unit, a refrigerated bin, an aggregate bin, a mixing station, and a powder bin. By continuously introducing cooling gas into the refrigerated bin through the refrigeration unit and taking away the hot gas, the cooling effect on the aggregates is achieved.

[0004] However, the cooling rates of water cooling and air cooling are slow. Ice block cooling cannot directly cool the aggregates. Although liquid nitrogen cooling has a fast speed, there are risks of overcooling, uneven cooling, and it cannot be recycled, resulting in low cooling efficiency of the aggregates and high operating costs.

[0005] Therefore, how to effectively improve the cooling uniformity and cooling efficiency of aggregates and reduce the operating costs has become an urgent problem to be solved in this field. Summary of the Invention

[0006] Aiming at the defects of the existing technologies, the purpose of the present invention is to provide an aggregate cooling system and method that can achieve rapid and uniform cooling of aggregates, improve the cooling efficiency, and reduce the operating costs.

[0007] To achieve the above purpose, the aggregate cooling system provided by the present invention includes a cooling box, a stirring device, and a cooling circulation system.

[0008] An aggregate stirring tank is arranged in the cooling box. The stirring device is built in the aggregate stirring tank and is used to dynamically mix the concrete aggregates in the aggregate stirring tank. Cooling pipes are distributed on the outer surface of the aggregate stirring tank, and the cooling pipes are connected to the cooling circulation system.

[0009] The cooling circulation system includes a carbon dioxide circulation mechanism, a refrigerant circulation mechanism, and a cooling water circulation mechanism. One end of the carbon dioxide circulation mechanism exchanges heat with the aggregate mixing tank through the cooling pipe, and the other end cooperates with the refrigerant circulation mechanism for heat exchange to form a closed carbon dioxide circulation loop. The two ends of the refrigerant circulation mechanism respectively cooperate with the carbon dioxide circulation mechanism and the cooling water circulation mechanism for heat exchange to form a closed refrigerant circulation loop. The two ends of the cooling water circulation mechanism respectively exchange heat with the refrigerant circulation mechanism and the external atmosphere to form a closed cooling water circulation loop.

[0010] Further, the stirring device includes a driving motor, a turntable, and a stirring assembly. One end of the turntable is connected to the driving motor disposed outside the aggregate mixing tank, and the other end is connected to the stirring assembly built inside the aggregate mixing tank.

[0011] Further, several stirring assemblies are distributed on the turntable, including a stirring shaft and stirring rods distributed on the stirring shaft. The stirring rods of adjacent stirring assemblies are staggered.

[0012] Further, the carbon dioxide circulation mechanism includes a carbon dioxide supply pipe and a carbon dioxide return pipe. The carbon dioxide supply pipe and the carbon dioxide return pipe are configured to be connected in a U-shaped distribution, and the open end cooperates with the cooling pipe, and the closed end is built inside the evaporator.

[0013] Further, a carbon dioxide pump is provided on the return pipe.

[0014] Further, the cooling pipe includes a liquid inlet pipe and a liquid outlet pipe. One end of the liquid inlet pipe is connected to the carbon dioxide supply pipe, and the other end is communicated with the liquid outlet pipe. The liquid outlet pipe is distributed on both sides of the liquid inlet pipe, one end is communicated with the liquid inlet pipe, and the other end is connected to the carbon dioxide return pipe.

[0015] Further, the refrigerant circulation mechanism includes a refrigerant circulation pipe distributed in a ring shape. One end of the refrigerant circulation pipe is built inside the evaporator to cooperate with the closed end of the carbon dioxide circulation mechanism, and the other end is built inside the condenser to cooperate with the cooling water circulation mechanism. A compressor is also provided on the refrigerant circulation pipe.

[0016] Further, the cooling water circulation mechanism includes a cooling water circulation pipe distributed in a ring shape. One end of the cooling water circulation pipe is built inside the condenser to cooperate with the refrigerant circulation pipe, and the other end is built inside the cooling tower.

[0017] Further, a concrete aggregate inlet is provided at the top end of the aggregate mixing tank, and a concrete aggregate outlet extending out of the cooling box is provided at the bottom end.

[0018] To achieve the above object, the aggregate cooling method provided by the present invention is based on the aggregate cooling system, and the cooling method includes:

[0019] One end of the carbon dioxide circulation mechanism exchanges heat with the aggregate mixing tank through the cooling pipe, and the other end cooperates with the refrigerant circulation mechanism for heat exchange to form a closed carbon dioxide circulation loop. Both ends of the refrigerant circulation mechanism respectively cooperate with the carbon dioxide circulation mechanism and the cooling water circulation mechanism for heat exchange to form a closed refrigerant circulation loop. Both ends of the cooling water circulation mechanism respectively exchange heat with the refrigerant circulation mechanism and the external atmosphere to form a closed cooling water circulation loop, and dissipate the heat of the aggregate mixing tank to the external atmosphere.

[0020] The mixing device synchronously performs dynamic mixing on the concrete aggregates in the aggregate mixing tank.

[0021] The aggregate cooling system and method provided by the present invention adopt a carbon dioxide circulation mechanism to exchange heat with the aggregate mixing tank, make full use of a large amount of latent heat released during the gasification process of liquid carbon dioxide, can quickly reduce the temperature of the concrete aggregates, so that the concrete aggregates are quickly cooled, and cooperate with the dynamic mixing of the mixing device to ensure the cooling uniformity of the concrete aggregates and avoid local temperature differences. At the same time, the carbon dioxide circulation mechanism cooperates with the refrigerant circulation mechanism and the cooling water circulation mechanism to perform multi-stage heat exchange, form a closed circulation system, realize the efficient recovery and recycling of carbon dioxide, and reduce the dependence on water resources, thereby improving the cooling efficiency and reducing the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of the aggregate cooling system provided by the present invention;

[0024] Figure 2 It is a schematic cross-sectional view of the aggregate mixing tank in the present invention;

[0025] Figure 3 It is a schematic top view of the aggregate mixing tank in the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the cooling circulation system in the present invention.

[0027] Reference numerals:

[0028] 1. Cooling box; 11. Aggregate mixing tank; 111. Concrete aggregate inlet; 112. Concrete aggregate outlet; 12. Cooling pipe; 121. Liquid inlet pipe; 122. Liquid outlet pipe; 13. Pipe hole;

[0029] 2. Stirring device; 21. Driving motor; 22. Turntable; 23. Stirring assembly; 231. Stirring shaft; 232. Stirring rod

[0030] 3. Cooling circulation system; 31. Carbon dioxide circulation mechanism; 311. Carbon dioxide supply pipe; 312. Carbon dioxide return pipe; 313. Supply port; 314. Return port; 315. Closed end; 316. Carbon dioxide pump; 32. Refrigerant circulation mechanism; 321. Refrigeration circulation pipe; 322. First end region; 323. Second end region; 33. Cooling water circulation mechanism; 331. Cooling water circulation pipe; 34. Evaporator; 35. Compressor; 36. Condenser; 37. Cooling tower Detailed implementation manners

[0031] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below with reference to specific drawings

[0032] See Figure 1 , which shows an example of the aggregate cooling system provided by the present invention

[0033] As can be seen from the figure, the aggregate cooling system of this example mainly includes a cooling box 1, a stirring device 2 and a cooling circulation system 3

[0034] An aggregate stirring tank 11 is arranged in the cooling box 1. The stirring device 2 is built in the aggregate stirring tank 11 and is used to dynamically mix the concrete aggregates in the aggregate stirring tank 11. Cooling pipes 12 are distributed on the outer surface of the aggregate stirring tank 11, and the cooling pipes 12 are connected to the cooling circulation system 3

[0035] Furthermore, the cooling circulation system 3 includes a carbon dioxide circulation mechanism 31, a refrigerant circulation mechanism 32 and a cooling water circulation mechanism 33. One end of the carbon dioxide circulation mechanism 31 exchanges heat with the aggregate stirring tank 11 through the cooling pipe 12, and the other end cooperates with the refrigerant circulation mechanism 32 for heat exchange to form a closed carbon dioxide circulation loop, making full use of the large amount of latent heat released during the gasification process of liquid carbon dioxide, which can quickly reduce the temperature of the concrete aggregates, so that the concrete aggregates are quickly cooled, and in cooperation with the dynamic mixing of the stirring device 2, it ensures the cooling uniformity of the concrete aggregates and avoids local temperature differences

[0036] Meanwhile, both ends of the refrigerant circulation mechanism 32 are respectively cooperated with the carbon dioxide circulation mechanism 31 and the cooling water circulation mechanism 33 for heat exchange to form a closed refrigerant circulation loop. Both ends of the cooling water circulation mechanism 33 are respectively in heat exchange with the refrigerant circulation mechanism 32 and the external atmosphere to form a closed cooling water circulation loop. Through multi-stage heat exchange, a closed circulation system is formed to achieve efficient recovery and recycling of carbon dioxide and reduce the dependence on water resources, thereby improving the cooling efficiency and reducing the operating cost.

[0037] Combined with Figure 1 , wherein, the cooling box 1 is configured as a closed box body, and the aggregate mixing tank 11 is built in the cooling box 1. When the aggregate mixing tank 11 exchanges heat with the cooling circulation system 3, the heat is enclosed in the cooling box 1 to prevent heat loss, so that the aggregate mixing tank 11 can be quickly cooled down, and the cooling effect of the concrete aggregate can be improved.

[0038] Combined with Figures 1 to 3 , further, the aggregate mixing tank 11 is built in the cooling box 1 and is hermetically connected to the cooling box 1 to ensure heat sealing. The top end of the aggregate mixing tank 11 extends out of the cooling box 1 for easy cooperation with the mixing device 2, and a concrete aggregate inlet 111 is provided at the top end, and a concrete aggregate outlet 112 extending out of the cooling box 1 is provided at the bottom end. So that the concrete aggregate enters the aggregate mixing tank 11 from the concrete aggregate inlet 111 at the top end, and can smoothly discharge from the concrete aggregate outlet 112 at the bottom end under the action of gravity after being cooled in the aggregate mixing tank 11, so as to improve the cooling rate and utilization efficiency of the concrete aggregate.

[0039] Combined with Figure 2 and Figure 3 , correspondingly, the mixing device 2 includes a driving motor 21, a turntable 22 and a mixing component 23. The driving motor 21 is arranged outside the aggregate mixing tank 11, preferably arranged at the top end of the aggregate mixing tank 11 to prevent the driving motor 21 from failing due to the low temperature and mixing inside the aggregate mixing tank 11. The turntable 22 is built in the aggregate mixing tank 11, preferably arranged at the inner top end of the aggregate mixing tank 11, and one end is connected to the driving motor 21, and the other end is connected to the mixing component 23 built in the aggregate mixing tank 11, so that the driving motor 21 can drive the turntable 22 to rotate, so as to drive the mixing component 23 to rotate synchronously in the aggregate mixing tank 11, thereby mixing the concrete aggregate in the aggregate mixing tank 11 and improving the cooling uniformity of the concrete aggregate.

[0040] Further, the mixing component 23 includes a mixing shaft 231 and mixing rods 232. The mixing shaft 231 is connected to the turntable 22, and the mixing rods 232 are distributed on the mixing shaft 231 along the height direction of the mixing shaft 231, so that the turntable 22 can drive the mixing shaft 231 and the mixing rods 232 to rotate synchronously, and the mixing rods 232 can mix the concrete aggregate.

[0041] Combined with Figure 2 , in order to improve the mixing effect and cooling uniformity of concrete aggregates, a number of stirring components 23 are distributed on the turntable 22. In this example, there are 2 stirring components 23 distributed on the turntable 22, and the stirring rods 232 of adjacent stirring components 23 are staggered, so that the turntable 22 can drive a number of stirring components 23 to rotate synchronously, and the stirring rods 232 of adjacent stirring components 23 can cooperate with each other to increase the contact area with the concrete aggregates, so as to fully dynamically mix the concrete aggregates, and the stirring rods 232 of adjacent stirring components 23 are staggered without interference and collision, thus effectively improving the cooling uniformity of the concrete aggregates and avoiding local temperature difference.

[0042] Combined with Figure 3 , further, a number of cooling pipes 12 are distributed on the outer surface of the aggregate mixing tank 11, so that the cooling pipes 12 can cooperate with the cooling circulation system 3 to exchange heat with the aggregate mixing tank 11 and quickly cool the concrete aggregates.

[0043] Correspondingly, the cooling circulation system 3 includes a carbon dioxide circulation mechanism 31, a refrigerant circulation mechanism 32 and a cooling water circulation mechanism 33. The carbon dioxide circulation mechanism 31, the refrigerant circulation mechanism 32 and the cooling water circulation mechanism 33 can cooperate with each other, and through multi-stage heat exchange, form a closed circulation system to realize the efficient recovery and recycling of carbon dioxide, so as to utilize the large amount of latent heat released during the gasification process of liquid carbon dioxide to exchange heat with the aggregate mixing tank 11 and quickly reduce the temperature of the concrete aggregates to improve the cooling efficiency.

[0044] Combined with Figure 4 , wherein, one end of the carbon dioxide circulation mechanism 31 exchanges heat with the aggregate mixing tank 11 through the cooling pipe 12, and the other end cooperates with the refrigerant circulation mechanism 32 for heat exchange to form a closed carbon dioxide circulation loop.

[0045] Specifically, the carbon dioxide circulation mechanism 31 includes a carbon dioxide supply pipe 311 and a carbon dioxide return pipe 312. The carbon dioxide supply pipe 311 and the carbon dioxide return pipe 312 are configured in a connected U-shaped distribution, and the open ends of the carbon dioxide supply pipe 311 and the carbon dioxide return pipe 312 are respectively formed with a supply port 313 and a return port 314, so that the carbon dioxide supply pipe 311 and the carbon dioxide return pipe 312 are respectively connected to the cooling pipe 12 through the supply port 313 and the return port 314 to cool the aggregate mixing tank 11. At the same time, the closed end 315 where the carbon dioxide supply pipe 311 and the carbon dioxide return pipe 312 are connected is built in the evaporator 34 to exchange heat with the refrigerant circulation mechanism 32.

[0046] Combined with Figure 4, correspondingly, the cooling pipe 12 includes a liquid inlet pipe 121 and a liquid outlet pipe 122. The inlet end of the liquid inlet pipe 121 extends out of the cooling tank 1 and is connected to the liquid supply port 313 of the carbon dioxide supply pipe 311, and the outlet end is communicated with the liquid outlet pipe 122, so that the liquid inlet pipe 121 and the carbon dioxide supply pipe 311 cooperate to form a conveying pipeline for carbon dioxide to enter the cooling tank 1.

[0047] Correspondingly, the liquid outlet pipe 122 is configured to be U-shaped and distributed on both sides of the liquid inlet pipe 121. The inlet end of the liquid outlet pipe 122 is communicated with the outlet end of the liquid inlet pipe 121, and the outlet end of the liquid outlet pipe 122 extends out of the cooling tank 1 and is connected to the liquid return port 314 of the carbon dioxide return pipe 312, so that the liquid outlet pipe 122 and the carbon dioxide return pipe 312 cooperate to form a conveying pipeline for carbon dioxide to discharge from the cooling tank 1.

[0048] Combined with Figure 1 , further, the cooling tank 1 is also provided with pipe holes 13 for cooperating with the liquid inlet pipe 122 and the liquid outlet pipe 122 respectively, so that the liquid inlet pipe 122 and the liquid outlet pipe 122 extend out of the pipe holes 13 respectively and are hermetically connected to the pipe holes 13 to ensure the effective sealing of the cooling tank 1.

[0049] Preferably, among the several cooling pipes 12 distributed on the outer surface of the aggregate mixing tank 11, the inlet ends of the several liquid inlet pipes 121 are connected to each other, so that the several liquid inlet pipes 121 are connected to the carbon dioxide supply pipe 311 through the same pipe. Correspondingly, the outlet ends of the several liquid outlet pipes 122 are connected to each other, so that the several liquid outlet pipes 122 are connected to the carbon dioxide return pipe 312 through the same pipe, so that only two pipe holes 13 need to be distributed on the cooling tank 1 to ensure the effective sealing of the cooling tank 1 and improve the compactness of the pipeline distribution structure at the same time.

[0050] Combined with Figure 4 , in addition, a carbon dioxide pump 316 is also provided on the carbon dioxide return pipe 312.

[0051] In this way, the carbon dioxide supply pipe 311, the liquid inlet pipe 121, the liquid outlet pipe 122 and the carbon dioxide return pipe 312 cooperate to form a closed carbon dioxide circulation loop.

[0052] Therefore, the liquid carbon dioxide in the carbon dioxide circulation mechanism 31 can be transported to the liquid inlet pipe 121 through the carbon dioxide supply pipe 311 and enter the cooling tank 1, and adhere to the outer surface of the aggregate mixing tank 11, exchange heat with the aggregate mixing tank 11, absorb a large amount of heat of the concrete aggregate, so that the liquid carbon dioxide quickly vaporizes, resulting in a significant drop in the surrounding environmental temperature to cool the aggregate mixing tank 11 and quickly cool the concrete aggregate in the aggregate mixing tank 11.

[0053] At the same time, the stirring device 2 dynamically mixes the concrete aggregate in the aggregate mixing tank 11 to improve the cooling uniformity of the concrete aggregate.

[0054] At this time, a part of the liquid carbon dioxide in the liquid inlet pipe 121 that exchanges heat with the aggregate mixing tank 11 quickly vaporizes into a gas, mixes with the remaining liquid carbon dioxide to form carbon dioxide in a gas-liquid mixed state, and enters the liquid outlet pipe 122 together through the outlet end of the liquid inlet pipe 121. The carbon dioxide pump 316 on the carbon dioxide return pipe 312 discharges the carbon dioxide in the gas-liquid mixed state in the liquid outlet pipe 122 and enters the carbon dioxide return pipe 312.

[0055] In order to restore the carbon dioxide in the gas-liquid mixed state to liquid carbon dioxide, it re-enters the liquid inlet pipe 121 through the carbon dioxide supply pipe 311 from the carbon dioxide return pipe 312 for circulation, exchanges heat with the concrete aggregate in the aggregate mixing tank 11 again, and improves the cooling efficiency. The cooling circulation system 3 further includes a refrigerant circulation mechanism 32.

[0056] Combined with Figure 4 , the refrigerant circulation mechanism 32 includes a refrigerant circulation pipe 321 distributed in a ring shape. The first end region 322 of the refrigerant circulation pipe 321 is built into the evaporator 34 and cooperates with the closed end 315 of the carbon dioxide circulation mechanism 31, so that the refrigerant circulation mechanism 32 exchanges heat with the carbon dioxide circulation mechanism 31 in the evaporator 34 to restore the carbon dioxide in the gas-liquid mixed state to liquid carbon dioxide.

[0057] Specifically, in the evaporator 34, the liquid refrigerant in the refrigerant circulation pipe 321, such as ammonia or freon, exchanges heat with the carbon dioxide in the gas-liquid mixed state at the closed end 315 of the carbon dioxide return pipe 312 in the first end region 322 of the refrigerant circulation pipe 321, absorbs the heat of the carbon dioxide in the gas-liquid mixed state, so that the carbon dioxide in the gas-liquid mixed state is re-liquefied into liquid carbon dioxide, and can re-enter the liquid inlet pipe 121 through the carbon dioxide supply pipe 311 for circulation, exchanges heat with the concrete aggregate in the aggregate mixing tank 11 again, improves the cooling efficiency, forms a closed carbon dioxide circulation loop, efficiently recovers and recycles carbon dioxide, and reduces the operating cost.

[0058] At the same time, after the liquid refrigerant in the refrigerant circulation pipe 321 absorbs the heat of the carbon dioxide in the gas-liquid mixed state, it evaporates into a gaseous refrigerant. In order to make the gaseous refrigerant return to the liquid refrigerant and exchange heat with the carbon dioxide circulation mechanism 31 again to realize the circulation of the refrigerant, a compressor 35 is also provided on the refrigerant circulation pipe 321, and the second end region 323 of the refrigerant circulation pipe 321 is built into the condenser 36 and cooperates with the cooling water circulation mechanism 33 for heat exchange.

[0059] In this way, the gaseous refrigerant in the refrigerant circulation pipe 321 is compressed by the compressor 35 to form a high-temperature and high-pressure gas. In the condenser 36, the high-temperature and high-pressure gas in the second end region 323 exchanges heat with the cooling water circulation mechanism 33 and can be restored to a liquid refrigerant.

[0060] Combined with Figure 4 , correspondingly, the cooling water circulation mechanism 33 includes a cooling water circulation pipe 331 distributed in a ring shape. One end region of the cooling water circulation pipe 331 that cooperates with the refrigerant circulation mechanism 32 is built in the condenser 36 and cooperates with the second end region 323 of the refrigerant circulation pipe 321 for heat exchange, so that the low-temperature cooling water in the cooling water circulation pipe 331 exchanges heat with the high-temperature and high-pressure gas in the second end region 323, absorbs the heat of the high-temperature and high-pressure gas, and re-liquefies the high-temperature and high-pressure gas into a low-temperature liquid refrigerant, enabling the liquid refrigerant to circulate to the evaporator 34 again to exchange heat with the carbon dioxide circulation mechanism 31 to form a closed refrigerant circulation loop.

[0061] Preferably, a throttle valve is further provided on the refrigerant circulation pipe 321, so that the liquid refrigerant can enter the evaporator 34 after being depressurized by the throttle valve, improving the stability of this cooling system.

[0062] At the same time, after the low-temperature cooling water in the cooling water circulation pipe 331 exchanges heat with the refrigerant circulation mechanism 32, the temperature of the low-temperature cooling water rises to form high-temperature cooling water. In order to cool the high-temperature cooling water back to low-temperature cooling water, the other end region of the cooling water circulation pipe 331 is built in the cooling tower 37, and the heat of the high-temperature cooling water is dissipated to the atmosphere through the evaporation and fan action in the cooling tower 37, enabling the high-temperature cooling water to exchange heat with the external atmosphere and cool back to low-temperature cooling water, and can exchange heat with the refrigerant circulation mechanism 32 again to form a closed cooling water circulation loop.

[0063] Combined with Figure 4 , the cooling circulation system 3 thus formed exchanges heat with the aggregate mixing tank 11 through the cooperation of the carbon dioxide circulation mechanism 31 and the cooling pipe 12, enabling the concrete aggregate to be quickly cooled. At the same time, the liquid carbon dioxide absorbs heat and vaporizes to form a gas-liquid mixed state of carbon dioxide, and exchanges heat with the liquid refrigerant in the refrigerant circulation mechanism 32 in the evaporator 34, re-liquefying the gas-liquid mixed state of carbon dioxide into liquid carbon dioxide, and circulating again to exchange heat with the aggregate mixing tank 11 to form a closed carbon dioxide circulation loop.

[0064] Meanwhile, the liquid refrigerant in the refrigerant circulation mechanism 32 absorbs heat in the evaporator 34 and evaporates to form gaseous refrigerant. After being compressed by the compressor 35, it forms a high-temperature and high-pressure gas, and exchanges heat with the low-temperature cooling water in the cooling water circulation mechanism 33 in the condenser 36, re-liquefying the high-temperature and high-pressure gas into low-temperature liquid refrigerant, and then circulating back to the evaporator 34 again to form a closed refrigerant circulation loop.

[0065] Correspondingly, the low-temperature cooling water in the cooling water circulation mechanism 33 absorbs heat in the condenser 36 to form high-temperature cooling water, and enters the cooling tower 37. Through the evaporation of the cooling tower 37 and the action of the fan for heat exchange with the external atmosphere, the heat is dissipated to the external atmosphere, thereby cooling down to low-temperature cooling water, and then circulating back to the condenser 36 again to form a closed cooling water circulation loop.

[0066] In this way, the carbon dioxide circulation mechanism 31, the refrigerant circulation mechanism 32, and the cooling water circulation mechanism 33 do not directly contact. Through the mutual cooperation with the evaporator 34, the compressor 35, the condenser 36, and the cooling tower 37, multi-stage heat exchange can be achieved, forming a closed circulation system, thereby realizing the efficient recovery and recycling of carbon dioxide. Utilizing the large amount of latent heat released during the gasification process of liquid carbon dioxide for heat exchange with the aggregate mixing tank 11 can quickly reduce the temperature of concrete aggregates, improve the cooling efficiency, reduce the operating cost, and also reduce the dependence on water resources, reduce carbon emissions, and achieve green construction.

[0067] Here, the evaporator 34, the compressor 35, the condenser 36, and the cooling tower 37 are conventional technical means in the art and will not be elaborated here.

[0068] Thus, the aggregate cooling system provided by the present invention is constituted. This aggregate cooling system meets the requirements for large-scale concrete aggregate cooling during dam construction and is also applicable to other complex environments.

[0069] The present invention also provides an aggregate cooling method. Based on the aggregate cooling system constituted by the above solution, combined with Figure 4 , this cooling method includes:

[0070] One end of the carbon dioxide circulation mechanism 31 exchanges heat with the aggregate mixing tank 11 through the cooling pipe 12, and the other end cooperates with the refrigerant circulation mechanism 32 for heat exchange to form a closed carbon dioxide circulation loop, so as to quickly cool the concrete aggregates.

[0071] Specifically, the liquid carbon dioxide in the carbon dioxide circulation mechanism 31 is transported through the carbon dioxide supply pipe 311 to the liquid inlet pipe 121 and enters the cooling tank 1, where it adheres to the outer surface of the aggregate stirring tank 11 and exchanges heat with the aggregate stirring tank 11, absorbing a large amount of heat from the concrete aggregate, causing the liquid carbon dioxide to rapidly vaporize, resulting in a significant drop in the surrounding environmental temperature, so as to cool the aggregate stirring tank 11 and quickly cool the concrete aggregate in the aggregate stirring tank 11.

[0072] At this time, a part of the liquid carbon dioxide in the liquid inlet pipe 121 that exchanges heat with the aggregate stirring tank 11 rapidly vaporizes into gas, mixes with the remaining liquid carbon dioxide to form carbon dioxide in a gas-liquid mixed state, and enters the liquid outlet pipe 122 together through the outlet end of the liquid inlet pipe 121. The carbon dioxide pump 316 on the carbon dioxide return pipe 312 discharges the carbon dioxide in the gas-liquid mixed state in the liquid outlet pipe 122 and enters the evaporator 34 through the carbon dioxide return pipe 312.

[0073] In the evaporator 34, the liquid refrigerant in the refrigerant circulation pipe 321, such as ammonia or freon, exchanges heat with the carbon dioxide in the gas-liquid mixed state at the closed end 315 of the carbon dioxide return pipe 312 in the first end region 322 of the refrigerant circulation pipe 321, absorbing the heat of the carbon dioxide in the gas-liquid mixed state, so that the carbon dioxide in the gas-liquid mixed state is re-liquefied into liquid carbon dioxide, which can enter the liquid inlet pipe 121 again through the carbon dioxide supply pipe 311 for circulation, and exchange heat with the concrete aggregate in the aggregate stirring tank 11 again to improve the cooling efficiency, so as to form a closed carbon dioxide circulation loop, efficiently recover and recycle carbon dioxide, and reduce the operating cost.

[0074] At the same time, both ends of the refrigerant circulation mechanism 32 cooperate with the carbon dioxide circulation mechanism 31 and the cooling water circulation mechanism 33 to exchange heat, forming a closed refrigerant circulation loop.

[0075] Specifically, the gaseous refrigerant in the refrigerant circulation pipe 321 is compressed by the compressor 35 to form a high-temperature and high-pressure gas and enters the condenser 36. In the condenser 36, the low-temperature cooling water in the cooling water circulation pipe 331 exchanges heat with the high-temperature and high-pressure gas in the second end region 323, absorbing the heat of the high-temperature and high-pressure gas, and re-liquefying the high-temperature and high-pressure gas into a low-temperature liquid refrigerant, so that the liquid refrigerant passes through the throttle valve to reduce the pressure and then circulates to the evaporator 34 again to exchange heat with the carbon dioxide circulation mechanism 31, so as to form a closed refrigerant circulation loop.

[0076] At the same time, both ends of the cooling water circulation 33 mechanism exchange heat with the refrigerant circulation mechanism 32 and the external atmosphere respectively, forming a closed cooling water circulation loop.

[0077] Specifically, after the low-temperature cooling water in the cooling water circulation pipe 331 exchanges heat with the refrigerant circulation mechanism 32, the temperature of the low-temperature cooling water rises to form high-temperature cooling water, which then enters the cooling tower 37. In the cooling tower 37, through the evaporation of the cooling tower 37 and the action of the fan, the heat of the high-temperature cooling water is dissipated to the atmosphere, enabling the high-temperature cooling water to exchange heat with the external atmosphere and cool down to return to low-temperature cooling water, which can then be recycled to the condenser 36 to exchange heat with the refrigerant circulation mechanism 32 to form a closed cooling water circulation loop.

[0078] During this process, the stirring device 2 synchronously dynamically mixes the concrete aggregates in the aggregate stirring tank 11 to improve the cooling uniformity.

[0079] Combined Figure 2 , the driving motor 21 drives the turntable 22 to rotate, so as to drive a number of stirring components 23 to rotate synchronously in the aggregate stirring tank 11, thereby dynamically stirring and mixing the concrete aggregates in the aggregate stirring tank 11 and improving the cooling uniformity of the concrete aggregates.

[0080] The aggregate cooling system and method provided by the present invention, the cooling box 1, the stirring device 2 and the cooling circulation system 3 cooperate with each other. Through multi-stage heat exchange, a closed circulation system is formed, enabling efficient recovery and recycling of carbon dioxide, improving the cooling efficiency of concrete aggregates, reducing the operating cost, and cooperating with the synchronous dynamic mixing of the stirring device 2 to improve the cooling uniformity.

[0081] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An aggregate cooling system, characterized in that, It includes a cooling box, a stirring device and a cooling circulation system. An aggregate stirring tank is arranged inside the cooling box. The stirring device is built inside the aggregate stirring tank and is used to dynamically mix the concrete aggregates in the aggregate stirring tank. Cooling pipes are distributed on the outer surface of the aggregate stirring tank, and the cooling pipes are connected to the cooling circulation system. The cooling circulation system includes a carbon dioxide circulation mechanism, a refrigerant circulation mechanism and a cooling water circulation mechanism. One end of the carbon dioxide circulation mechanism exchanges heat with the aggregate stirring tank through the cooling pipe, and the other end cooperates with the refrigerant circulation mechanism for heat exchange to form a closed carbon dioxide circulation loop. Both ends of the refrigerant circulation mechanism respectively cooperate with the carbon dioxide circulation mechanism and the cooling water circulation mechanism for heat exchange to form a closed refrigerant circulation loop. Both ends of the cooling water circulation mechanism respectively exchange heat with the refrigerant circulation mechanism and the external atmosphere to form a closed cooling water circulation loop.

2. The aggregate cooling system according to claim 1, wherein The stirring device includes a driving motor, a turntable and a stirring assembly. One end of the turntable is connected to the driving motor arranged outside the aggregate stirring tank, and the other end is connected to the stirring assembly built inside the aggregate stirring tank.

3. The aggregate cooling system according to claim 2, wherein A number of stirring assemblies are distributed on the turntable, including stirring shafts and stirring rods distributed on the stirring shafts. The stirring rods of adjacent stirring assemblies are staggered.

4. The aggregate cooling system according to claim 1, characterized in that, The carbon dioxide circulation mechanism includes a carbon dioxide supply pipe and a carbon dioxide return pipe. The carbon dioxide supply pipe and the carbon dioxide return pipe are configured in a communicating U-shaped distribution, and the open ends cooperate with the cooling pipes, and the closed ends are built inside the evaporator.

5. The aggregate cooling system according to claim 4, wherein, A carbon dioxide pump is provided on the return pipe.

6. The aggregate cooling system according to claim 4, wherein The cooling pipe includes a liquid inlet pipe and a liquid outlet pipe. One end of the liquid inlet pipe is connected to the carbon dioxide supply pipe, and the other end is communicated with the liquid outlet pipe. The liquid outlet pipe is distributed on both sides of the liquid inlet pipe, one end is communicated with the liquid inlet pipe, and the other end is connected to the carbon dioxide return pipe.

7. The aggregate cooling system according to claim 4, wherein The refrigerant circulation mechanism includes a refrigerant circulation pipe distributed in a ring shape. One end of the refrigerant circulation pipe is built inside the evaporator and cooperates with the closed end of the carbon dioxide circulation mechanism, and the other end is built inside the condenser and cooperates with the cooling water circulation mechanism. A compressor is also provided on the refrigerant circulation pipe.

8. The aggregate cooling system according to claim 7, wherein, The cooling water circulation mechanism includes a cooling water circulation pipe distributed in a ring shape. One end of the cooling water circulation pipe is built inside the condenser and cooperates with the refrigerant circulation pipe, and the other end is built inside the cooling tower.

9. The aggregate cooling system according to claim 1, characterized in that A concrete aggregate inlet is provided at the top of the aggregate stirring tank, and a concrete aggregate outlet extending out of the cooling box is provided at the bottom.

10. An aggregate cooling method, characterized in that, Based on the aggregate cooling system according to any one of claims 1 to 9, the cooling method includes: One end of the carbon dioxide circulation mechanism exchanges heat with the aggregate mixing tank through the cooling pipe, and the other end cooperates with the refrigerant circulation mechanism for heat exchange to form a closed carbon dioxide circulation loop. The two ends of the refrigerant circulation mechanism respectively cooperate with the carbon dioxide circulation mechanism and the cooling water circulation mechanism for heat exchange to form a closed refrigerant circulation loop. The two ends of the cooling water circulation mechanism respectively cooperate with the refrigerant circulation mechanism and the external atmosphere for heat exchange to form a closed cooling water circulation loop, and dissipate the heat of the aggregate mixing tank to the external atmosphere. The mixing device synchronously performs dynamic mixing on the concrete aggregates in the aggregate mixing tank.

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