Large-volume concrete cooling system

Abstract

The invention provides a mass concrete cooling system which comprises a concrete block, a first cooling structure and a second cooling structure, the first cooling structure and the second cooling structure are embedded in the concrete block, an embedding hole is formed in the outer side of the concrete block, the first cooling structure is arranged in the embedding hole, and the second cooling structure is connected with the first cooling structure; the second cooling structure is connected with the heat pump circulation system. The first cooling structure comprises an insert and absorbent paper wrapping the outer side face of the insert, the insert and the absorbent paper are embedded in the insert hole, one end of the insert is fixedly connected with the inner end face of the insert hole, and the absorbent paper is attached to the inner side face of the insert hole. According to the mass concrete cooling system, the number of the cooling circulating water pipes can be reduced, the cooling effect is guaranteed, and the effect of efficiently cooling the interior of concrete is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering concrete cooling, and in particular relates to a large volume concrete cooling system. Background Art

[0002] In the concrete construction of construction projects, in order to prevent cracks in the concrete caused by temperature changes, especially deep cracks and through cracks, which have serious harm to the integrity, durability and impermeability of the concrete construction project, in order to ensure the quality of concrete pouring and the safety and long-term normal operation of the construction project, water cooling is one of the main measures for temperature control and crack prevention in large-volume concrete construction, that is, using cooling water to pass through the poured concrete to control the temperature of the concrete to reach the target value, thereby preventing the concrete from cracking. A temperature control measure.

[0003] The main method currently used in my country to reduce the internal temperature of large-volume concrete curing is to use circulating cooling water, that is, bury a large number of cooling circulating water pipes in the concrete, and transport cooling water into the cooling circulating water pipes to achieve the effect of cooling the inside of the concrete. The above method mainly has the following problems: a large number of cooling circulating water pipes need to be buried in the concrete, and the cooling circulating water pipes cannot be taken out for recycling, resulting in high construction costs, and the laying of cooling circulating water pipes is also extremely time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to provide a large-volume concrete cooling system, which solves the technical problem of how to reduce the number of cooling circulation water pipes and ensure the cooling effect, and achieves the effect of efficient cooling inside the concrete.

[0005] A large-volume concrete cooling system comprises a concrete block, a cooling structure 1 and a cooling structure 2 embedded in the concrete block, wherein an embedding hole is arranged on the outer side of the concrete block, the cooling structure 1 is arranged in the embedding hole, the cooling structure 2 is connected to the cooling structure 1; the cooling structure 2 is connected to a heat pump circulation system.

[0006] The cooling structure 1 includes an insert and absorbent paper covering the outer side of the insert. The insert and the absorbent paper are embedded in the insert hole. One end of the insert is fixedly connected to the inner end surface of the insert hole, and the absorbent paper is attached to the inner side surface of the insert hole.

[0007] The absorbent paper has several layers.

[0008] The second cooling structure comprises a heat exchange pipe passing through the concrete block and the insert, and pipe joints respectively arranged at both ends of the heat exchange pipe, and the heat exchange pipes on two adjacent concrete blocks are connected through the pipe joints; Cold air or cold liquid passes through the heat exchange tube.

[0009] One end of one of the heat exchange tubes is connected to a heat pump circulation system.

[0010] The heat exchange tube is arranged through the absorbent paper.

[0011] The heat pump cooling system includes an evaporator and a condenser. A compressor is arranged on the pipeline from the evaporator to the condenser, and a throttling device is arranged on the pipeline from the condenser to the evaporator, so that the fluid forms a heat pump cycle.

[0012] The evaporator is a horizontal shell and tube heat exchanger, and includes a tube side and a shell side, the fluid in the tube side is a cold source, the fluid in the shell side is a heat source, and the two ends of the tube side are respectively connected to the first tube box and the second tube box; A baffle group is arranged in the shell side, the baffle group comprises a lower baffle located at the lower part of the shell side and an upper baffle located at the upper part of the shell side, and the lower baffle and the upper baffle are arranged at intervals; The fluids in the shell side and the tube side flow in countercurrent. Along the flow direction of the fluid in the tube side, the spacing between the baffle groups increases continuously from the tube side inlet to the middle position of the tube side, and the spacing between the baffle groups decreases continuously from the middle position of the tube side to the tube side outlet.

[0013] Along the flow direction of the fluid in the tube, from the inlet of the tube to the middle of the tube, the interval between the baffles increases continuously; From the middle position of the tube pass to the outlet of the tube pass, the spacing between the baffle groups decreases continuously.

[0014] A plurality of baffle groups are arranged in the tube shell, and along the flow direction of the liquid in the shell side, the area ratio of the adjacent lower baffles to the upper baffles in the baffle group gradually increases.

[0015] The present invention achieves the following significant effects: (1) A cooling structure 1 is provided, which has the following technical effects: One is to make the original large-volume concrete block into a split structure, that is, to open a hole in the large-volume concrete block and embed the insert in the hole, which is helpful for the heat dissipation process; Second, multiple layers of absorbent paper are arranged on the outside of the insert. When a large volume of concrete needs to be cooled, water can be sprayed into the absorbent paper. Under the action of capillary action, the water gradually enters the inside of the insert hole. When the water gradually evaporates from the outside to the inside, the heat in the concrete is taken away, achieving a cooling effect. (2) A cooling structure 2 is provided, which has the following technical effects: First, heat exchange and cooling of concrete blocks and inserts are achieved through heat exchange pipes; Secondly, the heat exchange tubes are connected in series with concrete blocks and inserts, which have the technical effect of reinforcing ribs and realize series curing.

[0016] (3) The shell side and the tube side flow in countercurrent. Along the flow direction of the fluid in the tube side, the spacing of the baffle groups increases continuously from the tube side inlet to the middle of the tube side, and then decreases continuously from the middle of the tube side to the tube side outlet. In the countercurrent process, the heat transfer rate of the shell side and the tube side per unit length along the flow process of the fluid is relatively uniform, so that the overall heat transfer effect is the best. However, it is found in experiments and simulations that the heat transfer rate in the middle is significantly greater than the heat transfer rate at the tube side inlet and outlet. Therefore, the heat exchange area between the tube side fluid and the shell side fluid in the baffle changes by changing the baffle spacing. Therefore, the uneven heat transfer rate is compensated by the change in area, thereby further improving the heat transfer efficiency.

[0017] (4) As an improvement, along the flow direction of the fluid in the tube, from the tube entrance to the middle of the tube, the spacing of the baffles increases. Then, from the middle of the tube to the tube exit, the spacing of the baffles decreases. The above changes in the amplitude can make the heat transfer per unit length of the entire fluid movement more uniform, further improving the heat transfer efficiency.

[0018] (5) According to the present invention, the area ratio of the lower baffle to the upper baffle in the baffle group changes along the flow direction of the liquid, so that the liquid in the shell gradually moves toward the center as it flows, so that the heat exchange of the fluid center around the heat exchange tubes in the shell is enhanced, which changes the previous heat exchange method, enhances the heat exchange efficiency at different positions, makes the heat exchange uniform on the whole, and further achieves the purpose of enhancing heat transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of cooling structure 1 in the present invention.

[0020] Figure 2 It is a schematic diagram of the connection structure between the insert and the heat exchange tube in the present invention.

[0021] Figure 3 It is a structural schematic diagram of the concrete block in the present invention.

[0022] Figure 4 It is a working schematic diagram of the heat pump cooling system in the present invention.

[0023] Figure 5 It is the external schematic diagram of the evaporator in the present invention.

[0024] Figure 6Schematic diagram of the interior of the evaporator in the present invention.

[0025] Among them, the figure markings are: 1, concrete block; 2, heat exchange tube; 21, through hole; 3, absorbent paper; 4, insert; 41, insert hole; 6, shell side; 61, tube side; 62, upper baffle; 63, lower baffle; 7, hot fluid inlet; 8, cold fluid inlet; 9, pipe box one; 91, pipe box two; 10, cold fluid outlet; 11, hot fluid outlet. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0027] See also Figure 1-Figure 6 A large-volume concrete cooling system includes a concrete block 1, a cooling structure 1 and a cooling structure 2 embedded in the concrete block 1, an embedding hole 41 is provided on the outer side of the concrete block 1, the cooling structure 1 is arranged in the embedding hole 41, the cooling structure 2 is connected to the cooling structure 1; the cooling structure 2 is connected to a heat pump circulation system.

[0028] The first cooling structure includes an insert 4 and absorbent paper 3 wrapped on the outer side of the insert 4. The insert 4 and the absorbent paper 3 are embedded in the insert hole 41. One end of the insert 4 is fixedly connected to the inner end surface of the insert hole 41, and the absorbent paper 3 is attached to the inner side surface of the insert hole 41.

[0029] The absorbent paper 3 has several layers.

[0030] The second cooling structure includes a heat exchange tube 2 passing through the concrete block 1 and the insert 4, and pipe joints respectively arranged at both ends of the heat exchange tube 2, and the heat exchange tubes 2 on two adjacent concrete blocks 1 are connected by the pipe joints; The heat exchange tube 2 is filled with cold air or cold liquid, collectively referred to as cold medium, which becomes hot medium after being heated in the concrete block 1.

[0031] A through hole 21 is provided on the outer side of the concrete block 1 , and one end of the heat exchange tube 2 is connected to the through hole 21 .

[0032] One end of one of the heat exchange tubes 2 is connected to the heat pump circulation system.

[0033] The heat exchange tube 2 is arranged through the absorbent paper 3 .

[0034] The heat pump cooling system includes an evaporator and a condenser. A compressor is arranged on the pipeline from the evaporator to the condenser, and a throttling device is arranged on the pipeline from the condenser to the evaporator, so that the fluid forms a heat pump cycle.

[0035] The evaporator is a horizontal shell and tube heat exchanger, and includes a tube side 61 and a shell side 6. The fluid in the tube side 61 is a cold source, and the fluid in the shell side 6 is a heat source. Both ends of the tube side 61 are connected to the tube box 1 9 and the tube box 2 91 respectively. The two ends of the shell side 6 are respectively provided with a pipe box 1 9 and a pipe box 2 91, and the two ends of the tube side 61 are respectively connected with the pipe box 1 9 and the pipe box 2 91, wherein the pipe box 1 9 is provided with a cold fluid inlet 8, and the pipe box 2 91 is provided with a cold fluid outlet 10; the hot fluid outlet 11 is provided close to the cold fluid inlet 8, and the cold fluid outlet 10 is provided close to the hot fluid inlet 7; It should be noted that the cold fluid inlet 8, the cold fluid outlet 10, the compressor, the condenser, and the throttling device form a circulation system, that is, the cold fluid completes a refrigeration cycle through four basic processes of evaporation, compression, condensation, and throttling in the system.

[0036] A baffle group is provided in the shell side 6, and the baffle group includes a lower baffle 63 located at the lower part of the shell side 6 and an upper baffle 62 located at the upper part of the shell side 6, and the lower baffle 63 and the upper baffle 62 are arranged at intervals; The fluid in the shell side 6 and the tube side 61 flows in countercurrent. Along the flow direction of the fluid in the tube side 61, the spacing of the baffle groups increases continuously from the inlet of the tube side 61 to the middle position of the tube side 61, and the spacing of the baffle groups decreases continuously from the middle position of the tube side 61 to the outlet of the tube side 61.

[0037] Along the flow direction of the fluid in the tube pass 61, from the inlet of the tube pass 61 to the middle position of the tube pass 61, the spacing of the baffle group increases continuously; From the middle position of the tube pass 61 to the outlet of the tube pass 61, the spacing between the baffle groups decreases continuously.

[0038] A plurality of baffle groups are arranged in the tube shell, and along the flow direction of the liquid in the shell side 6, the area ratio of the adjacent lower baffles 63 to the upper baffles 62 in the baffle group gradually increases.

[0039] The specific working process of the present invention is: As an improvement, the fluid in the channel structure is a liquid.

[0040] As an improvement, the channel structure is connected to the evaporator of the heat pump cooling system through the heat exchange tube 2. The fluid absorbs heat in the concrete in the channel structure. The fluid after absorbing heat enters the evaporator through the heat exchange tube 2, exchanges heat with the cold source in the evaporator, and the cold source after heat exchange enters the condenser of the heat pump system to release heat, thereby forming a heat pump cycle.

[0041] The fluid in the shell side 6 is a heat source, which enters from the hot fluid inlet 7 and flows out from the hot fluid outlet 11. The two ends of the shell side 6 are respectively provided with a pipe box 1 9 and a pipe box 2 91, and the two ends of the tube side 61 are respectively connected to the pipe box 1 9 and the pipe box 2 91, wherein the pipe box 1 9 is provided with a cold fluid inlet 8, and the pipe box 2 91 is provided with a cold fluid outlet 10; the hot fluid outlet 11 is provided close to the cold fluid inlet 8, and the cold fluid outlet 10 is provided close to the hot fluid inlet 7; During operation, the cold liquid enters one end of the pipe side 61 from the cold fluid inlet 8 on the pipe box 1 9, flows out from the other end of the pipe side 61, and enters the cold fluid outlet 10 on the pipe box 2 91. The pipe box 1 9 and the pipe box 2 91 are independent cavities, and the two ends of the pipe side 61 are respectively connected to the two independent cavities. The cold fluid inlet 8 and the cold fluid outlet 10 are respectively arranged on the two independent cavities. After heat exchange, the cold liquid becomes hot liquid when it flows out from the cold fluid outlet 10; the hot medium flowing out of the large volume concrete enters from the hot fluid inlet 7 in the shell side 6, and flows out from the hot fluid outlet 11 in the shell side 6. The hot medium and the cold liquid flow in opposite directions. After heat exchange, the hot medium becomes cold medium and enters the concrete block again to cool down.

[0042] A compressor is arranged on the pipeline from the evaporator to the condenser, and a throttling device is arranged on the pipeline from the condenser to the evaporator, so that the fluid forms a heat pump cycle.

[0043] As an improvement, the evaporator is a shell and tube heat exchanger. The fluid in the tube side 61 is the cold source, and the fluid in the shell side 6 is the heat source, that is, the fluid in the channel structure enters the shell side 6. The shell and tube heat exchanger is a horizontal shell and tube heat exchanger.

[0044] A baffle group is arranged in the shell, and the baffle group includes a lower baffle 63 located at the lower part and an upper baffle 62 located at the upper part. The lower baffle 63 and the upper baffle 62 are arranged at intervals.

[0045] As an improvement, the shell side 6 and the tube side 61 flow in countercurrent, and along the flow direction of the fluid in the tube side 61, from the inlet of the tube side 61 to the middle position of the tube side 61, the spacing of the baffle group increases continuously. Then from the middle position of the tube side 61 to the outlet of the tube side 61, the spacing of the baffle group decreases continuously. Because in the countercurrent process, the heat exchange rate of the shell side 6 and the tube side 61 per unit length along the flow process of the fluid is relatively uniform, so that the overall heat exchange effect is the best. However, it was found in experiments and simulations that the heat exchange rate in the middle is significantly greater than the heat exchange rate at the inlet and outlet of the tube side 61. Therefore, by changing the spacing between the baffles, the heat exchange area between the tube side 61 fluid and the shell side 6 fluid in the baffle group also changes. Therefore, the uneven heat exchange rate is compensated by the change in area, thereby further improving the heat exchange efficiency.

[0046] As an improvement, along the flow direction of the fluid in the tube 61, the amplitude of the increasing spacing of the baffle groups from the inlet of the tube 61 to the middle of the tube 61 is continuously increasing. Then, from the middle of the tube 61 to the outlet of the tube 61, the amplitude of the decreasing spacing of the baffle groups is continuously decreasing. The above amplitude changes can make the heat exchange per unit length of the entire fluid movement more uniform, further improving the heat exchange efficiency.

[0047] A plurality of baffle groups are arranged in the tube shell, and the baffle group includes a lower baffle 63 located at the lower part of the tube shell and an upper baffle 62 located at the upper part of the tube shell; along the flow direction of the liquid in the shell side 6, the ratio of the area of ​​the lower baffle 63 in the baffle group to the area of ​​the upper baffle 62 gradually increases.

[0048] During the research process, it was found that the heat transfer of the baffles of the traditional heat exchanger is uneven in the cross-section in the direction of fluid flow. As the distance from the inlet increases, the heat transfer effect of the lower part of the shell side 6 becomes better and better, and the heat transfer effect of the upper part of the shell side 6 becomes worse and worse. The main reason is that as the liquid continues to flow. Because the liquid density is large, the liquid flows upward, which significantly increases the heat exchange liquid in the lower part, so it is necessary to design the heat exchange structure for improvement. In the present invention, along the flow direction of the liquid, the area ratio of the area of ​​the lower baffle 63 to the area of ​​the upper baffle 62 in the baffle group changes. As the liquid in the shell side 6 flows, it gradually moves closer to the center, so that the center of the fluid strengthens the heat exchange of the heat exchange tube 2 around the shell and tube, which changes the previous heat exchange method, enhances the heat exchange efficiency at different positions, makes the heat exchange uniform on the whole, and further achieves the purpose of enhancing heat transfer.

[0049] In addition to the above-mentioned heat exchange process, several layers of absorbent paper 3 are provided in the present solution. Water is sprayed on the outside of the absorbent paper 3. Due to the capillary phenomenon, the external water gradually penetrates into the inside of the concrete block. When heat is generated inside the concrete block, the water in the absorbent paper 3 absorbs the heat and evaporates, thereby achieving cooling, which is convenient and quick.

[0050] Therefore, under the combined effect of the heat exchange process of the shell and tube heat exchanger and the water evaporation of the absorbent paper 3, the cooling of the large volume concrete block is achieved.

[0051] Note: According to the definition of GB50496-2009 "Code for Construction of Large Volume Concrete", large volume concrete refers to large-volume concrete with the minimum geometric dimension of the concrete structure not less than 1m, or concrete that is expected to cause harmful cracks due to temperature changes and shrinkage caused by hydration of cementitious materials in the concrete.

[0052] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A large volume concrete cooling system, It is characterized in that It comprises a concrete block, a cooling structure 1 and a cooling structure 2 embedded in the concrete block; an embedding hole is arranged on the outer side of the concrete block, the cooling structure 1 is arranged in the embedding hole, the cooling structure 2 is connected to the cooling structure 1; the cooling structure 2 is connected to a heat pump circulation system.

2. The mass concrete cooling system according to claim 1, It is characterized in that The cooling structure 1 includes an insert and absorbent paper covering the outer side of the insert. The insert and the absorbent paper are embedded in the insert hole. One end of the insert is fixedly connected to the inner end surface of the insert hole, and the absorbent paper is attached to the inner side surface of the insert hole.

3. The mass concrete cooling system according to claim 2, It is characterized in that The absorbent paper has several layers.

4. The mass concrete cooling system according to claim 1, It is characterized in that The second cooling structure comprises a heat exchange pipe passing through the concrete block and the insert, and pipe joints respectively arranged at both ends of the heat exchange pipe, and the heat exchange pipes on two adjacent concrete blocks are connected through the pipe joints; Cold air or cold liquid passes through the heat exchange tube.

5. The mass concrete cooling system according to claim 4, It is characterized in that One end of one of the heat exchange tubes is connected to a heat pump circulation system.

6. The mass concrete cooling system according to claim 4, It is characterized in that The heat exchange tube is arranged through the absorbent paper.

7. The mass concrete cooling system according to claim 1, It is characterized in that The heat pump cooling system includes an evaporator and a condenser. A compressor is arranged on the pipeline from the evaporator to the condenser, and a throttling device is arranged on the pipeline from the condenser to the evaporator, so that the fluid forms a heat pump cycle.

8. The mass concrete cooling system according to claim 7, It is characterized in that The evaporator is a horizontal shell and tube heat exchanger, and includes a tube side and a shell side, the fluid in the tube side is a cold source, the fluid in the shell side is a heat source, and the two ends of the tube side are respectively connected to the first tube box and the second tube box; A baffle group is arranged in the shell side, the baffle group comprises a lower baffle located at the lower part of the shell side and an upper baffle located at the upper part of the shell side, and the lower baffle and the upper baffle are arranged at intervals; The fluids in the shell side and the tube side flow in countercurrent. Along the flow direction of the fluid in the tube side, the spacing between the baffle groups increases continuously from the tube side inlet to the middle position of the tube side, and the spacing between the baffle groups decreases continuously from the middle position of the tube side to the tube side outlet.

9. The mass concrete cooling system according to claim 7, It is characterized in that Along the flow direction of the fluid in the tube, from the inlet of the tube to the middle of the tube, the interval between the baffles increases continuously; From the middle position of the tube pass to the outlet of the tube pass, the spacing between the baffle groups decreases continuously.

10. The mass concrete cooling system according to claim 7, It is characterized in that A plurality of baffle groups are arranged in the tube shell, and along the flow direction of the liquid in the shell side, the area ratio of the adjacent lower baffles to the upper baffles in the baffle group gradually increases.

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