An integrated pre-cooling and pre-heating system for concrete production

Abstract

The present invention discloses an integrated system for precooling and preheating concrete production. When used for producing precooling concrete, the outlet of the refrigeration compressor is connected to the inlet of the condenser through a pipeline, the outlet of the condenser is connected to the inlet of the high-pressure liquid reservoir through a pipeline, the inlet of the air cooler is connected to the outlet of the refrigerant pump through a pipeline, the water cooler is connected to the outlet of the high-pressure liquid reservoir through a pipeline, the outlet of the air cooler and the water cooler are both connected to the air inlet of the low-pressure circulating liquid reservoir through a pipeline. When used for producing preheated concrete, the inlet of the air cooler and the water cooler are both connected to the outlet of the refrigeration compressor through a pipeline, the outlet of the air cooler and the water cooler are both connected to the inlet of the high-pressure liquid reservoir through a pipeline, the outlet of the refrigerant pump is connected to the inlet of the condenser through a pipeline, and the outlet of the condenser is connected to the air inlet of the low-pressure circulating liquid reservoir through a pipeline. The system has the advantages of being capable of being used for both concrete preheating production and concrete precooling production, having a simple structure, and having low production cost.

Description

Technical Field

[0001] The present invention relates to the field of concrete production, and in particular to an integrated pre-cooling and pre-heating system for concrete production. Background Art

[0002] Modern building construction often involves large-volume concrete construction, such as high-rise building foundations, large equipment foundations, hydropower station dam projects, and long-span bridges. Large-volume concrete has a low surface area coefficient and low thermal conductivity, resulting in very slow natural heat dissipation. However, the heat released from cement hydration is concentrated, leading to rapid and significant internal temperature increases. Concrete has low tensile strength and a small elastic modulus. Large temperature differences between the inside and outside of concrete can easily lead to temperature cracks, compromising structural safety and proper operation. Therefore, the maximum internal temperature rise of large-volume concrete must be strictly controlled. Controlling the temperature at the concrete outlet is currently one of the most effective and common measures to control concrete temperature rise.

[0003] The primary method for controlling the temperature of concrete at the outlet is to pre-cool or pre-heat the raw materials, i.e., to cool or heat them before mixing. Concrete raw materials typically include coarse aggregate, sand (fine aggregate), cementitious materials (cement, fly ash, etc.), water, and admixtures.

[0004] The currently commonly used pre-cooling processes mainly include air cooling of coarse aggregate and mixing with flake ice and cold water. The commonly used preheating processes mainly include steam heating of coarse aggregate by boiler and mixing with hot water. In the actual construction process, especially in Central Asia, West Asia, Central and Eastern Europe, and the high-altitude cold regions in northern and western my country, due to the large temperature difference between winter and summer, in the construction of large-scale infrastructure projects, in order to meet the normal construction of concrete under low temperature in winter and high temperature in summer, preheating measures must be taken in winter and precooling measures must be taken in summer. In the existing technology, two different sets of equipment must be used simultaneously to realize concrete pre-cooling production and preheating production, which greatly increases the investment cost, increases the space occupied by the equipment, and increases the complexity of the production process. Moreover, since both the pre-cooling equipment and the preheating equipment contain pressure vessels, adding a set of equipment adds a major source of danger. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an integrated concrete production pre-cooling and pre-heating system which can be used for both concrete pre-heating production and concrete pre-cooling production, has a simple structure and low production cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A pre-cooling and pre-heating integrated system for concrete production, comprising a refrigeration compressor, a high-pressure liquid reservoir, an air cooler, a water cooler, a refrigerant pump, a low-pressure circulating liquid reservoir and a condenser, wherein the inlet of the refrigeration compressor is connected to the air outlet of the low-pressure circulating liquid reservoir through a pipeline, the outlet of the high-pressure liquid reservoir is connected to the liquid inlet of the low-pressure circulating liquid reservoir through a pipeline, and the liquid outlet of the low-pressure circulating liquid reservoir is connected to the inlet of the refrigerant pump through a pipeline. When used to produce pre-cooled concrete, the outlet of the refrigeration compressor is connected to the inlet of the condenser through a pipeline, the outlet of the condenser is connected to the inlet of the high-pressure liquid reservoir through a pipeline, and the air cooler The inlet of the cooler is communicated with the outlet of the refrigerant pump through a pipeline, the water cooler is communicated with the outlet of the high-pressure liquid accumulator through a pipeline, the outlet of the air cooler and the water cooler are both communicated with the air inlet of the low-pressure circulating liquid accumulator through a pipeline. When used to produce preheated concrete, the inlet of the air cooler and the water cooler are both communicated with the outlet of the refrigeration compressor through a pipeline, the outlet of the air cooler and the water cooler are both communicated with the inlet of the high-pressure liquid accumulator through a pipeline, the outlet of the refrigerant pump is communicated with the inlet of the condenser through a pipeline, and the outlet of the condenser is communicated with the air inlet of the low-pressure circulating liquid accumulator through a pipeline.

[0008] As a further improvement of the above technical solution:

[0009] A throttle valve is provided on the pipeline between the outlet of the high-pressure liquid reservoir and the liquid inlet of the low-pressure circulating liquid reservoir, and on the pipeline between the outlet of the high-pressure liquid reservoir and the water cooler, respectively.

[0010] Control valves for controlling the opening and closing of each connecting pipeline are provided on the connecting pipelines between the outlet of the refrigeration compressor and the inlet of the condenser, between the outlet of the condenser and the inlet of the high-pressure liquid accumulator, between the outlet of the refrigerant pump and the inlet of the condenser, between the outlet of the refrigerant pump and the inlet of the air cooler, between the outlet of the water cooler and the outlet of the high-pressure liquid accumulator, between the outlet of the air cooler and the air inlet of the low-pressure circulating liquid accumulator, between the inlet of the air cooler and the outlet of the refrigeration compressor, between the water cooler and the outlet of the refrigeration compressor, between the outlet of the air cooler and the inlet of the high-pressure liquid accumulator, between the water cooler and the inlet of the high-pressure liquid accumulator, and between the outlet of the condenser and the air inlet of the low-pressure circulating liquid accumulator.

[0011] The control valve includes stop valves respectively arranged on the communication pipelines.

[0012] The water cooler has an interchangeable inlet and outlet.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] The integrated system for pre-cooling and preheating of concrete production of the present invention comprises a refrigeration compressor, a high-pressure liquid reservoir, an air cooler, a water cooler, a refrigerant pump, a low-pressure circulating liquid reservoir and a condenser. The inlet of the refrigeration compressor is connected to the air outlet of the low-pressure circulating liquid reservoir through a pipeline, the outlet of the high-pressure liquid reservoir is connected to the liquid inlet of the low-pressure circulating liquid reservoir through a pipeline, and the liquid outlet of the low-pressure circulating liquid reservoir is connected to the inlet of the refrigerant pump through a pipeline. When used for producing pre-cooled concrete, the outlet of the refrigeration compressor is connected to the inlet of the condenser through a pipeline, the outlet of the condenser is connected to the inlet of the high-pressure liquid reservoir through a pipeline, the inlet of the air cooler is connected to the outlet of the refrigerant pump through a pipeline, the water cooler is connected to the outlet of the high-pressure liquid reservoir through a pipeline, and the outlet of the air cooler and the water cooler are both connected to the air inlet of the low-pressure circulating liquid reservoir through a pipeline. The specific working process of producing pre-cooled concrete is: the refrigeration compressor discharges high-temperature and high-pressure refrigerant gas into the condenser, the condenser condenses the high-temperature and high-pressure gas into high-temperature and high-pressure liquid, the high-temperature and high-pressure liquid flows into the high-pressure liquid reservoir, and a part of the high-temperature The high-pressure liquid is cooled and depressurized to become a low-temperature, low-pressure liquid and enters the low-pressure circulating liquid reservoir. The low-temperature, low-pressure liquid in the low-pressure circulating liquid reservoir is pumped into the air cooler through the refrigerant pump. The other part of the high-temperature, high-pressure liquid is cooled and depressurized to become a low-temperature, low-pressure liquid and enters the water cooler. In the air cooler and water cooler, the low-temperature, low-pressure liquid absorbs heat and evaporates to become a low-temperature, low-pressure gas, thereby reducing the temperature of the air flowing through the air cooler and the water flowing through the water cooler. The cooled air enters the aggregate bin connected to the air cooler, which is The aggregates in the aggregate bin are pre-cooled, and the water cooled by the water cooler is directly mixed into the aggregates to further achieve pre-cooling. The low-temperature, low-pressure gas contains a large amount of unevaporated liquid. The low-temperature, low-pressure gas enters the low-pressure circulating liquid reservoir for gas-liquid separation. The liquid falls into the lower layer of the low-pressure circulating liquid reservoir and enters the air cooler again through the refrigerant pump to absorb heat. This process can further pre-cool the aggregates in the aggregate bin. The gas enters the refrigeration compressor in the upper layer of the low-pressure circulating liquid reservoir and is compressed into high-temperature, high-pressure gas in the refrigeration compressor and enters the next cycle;When used to produce preheated concrete, the inlet of the air cooler and the water cooler are connected to the outlet of the refrigeration compressor through a pipeline, the outlet of the air cooler and the water cooler are connected to the inlet of the high-pressure liquid storage device through a pipeline, the outlet of the refrigerant pump is connected to the inlet of the condenser through a pipeline, and the outlet of the condenser is connected to the air inlet of the low-pressure circulation liquid storage device through a pipeline. The specific working process of producing preheated concrete is: the refrigeration compressor discharges high-temperature and high-pressure refrigerant gas into the air cooler and the water cooler, and the air cooler and the water cooler condense the high-temperature and high-pressure gas into high-temperature and high-pressure liquid, thereby increasing the temperature of the air flowing through the air cooler and the water flowing through the water cooler. The heated air enters the aggregate bin connected to the air cooler, and the aggregate in the aggregate bin is heated. Aggregates are preheated, and water heated by a water cooler is directly mixed into the aggregates to further preheat the aggregates. The high-temperature and high-pressure liquid flows into the high-pressure reservoir, and then becomes a low-temperature and low-pressure liquid through cooling and pressure reduction treatment, and enters the low-pressure circulation reservoir. The low-temperature and low-pressure liquid in the low-pressure circulation reservoir is sent to the condenser through a refrigerant pump. Part of the low-temperature and low-pressure liquid absorbs heat and evaporates in the condenser to become a low-temperature and low-pressure gas. The low-temperature and low-pressure gas contains a large amount of unevaporated liquid. The low-temperature and low-pressure gas returns to the low-pressure circulation reservoir for gas-liquid separation. The liquid falls into the lower layer of the low-pressure circulation reservoir and enters the condenser again through the refrigerant pump to absorb heat. The gas enters the refrigeration compressor in the upper layer of the low-pressure circulation reservoir, is compressed into a high-temperature and high-pressure gas in the refrigeration compressor, and enters the next cycle. The integrated pre-cooling and preheating system for concrete production of the present invention uses the same equipment and is connected by two different sets of pipes. It can produce both pre-cooled concrete and pre-heated concrete without the need to set up different preheating or pre-cooling equipment, thereby greatly simplifying the system structure. Requiring only one team of production operators, this significantly reduces operating costs, reduces the space and maintenance costs of the pre-cooling and pre-heating systems, and eliminates the need for pressure vessels, a major source of hazard. The simultaneous installation of air and water coolers provides enhanced pre-cooling and pre-heating performance. Calculations show that using the integrated pre-cooling and pre-heating system for concrete production at -25°C / 40°C increases the theoretical energy efficiency ratio from 1 to over 3, compared to conventional boiler heating methods, significantly reducing energy costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the concrete production pre-cooling and preheating integrated system of the present invention.

[0016] Figure 2 It is a schematic diagram of pipeline connection when the present invention is used to produce pre-cooled concrete.

[0017] Figure 3 It is a schematic diagram of pipeline connection when the present invention is used to produce preheated concrete.

[0018] The numbers in the figure represent:

[0019] 1. Refrigeration compressor; 2. High-pressure liquid receiver; 3. Air cooler; 4. Water cooler; 5. Refrigerant pump; 6. Low-pressure circulating liquid receiver; 7. Condenser; 8. Shut-off valve; 9. Throttle valve. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figures 1 to 3 An embodiment of the pre-cooling and pre-heating integrated system for concrete production of the present invention is shown, which includes a refrigeration compressor 1, a high-pressure liquid reservoir 2, an air cooler 3, a water cooler 4, a refrigerant pump 5, a low-pressure circulating liquid reservoir 6 and a condenser 7. The inlet of the refrigeration compressor 1 is connected to the air outlet of the low-pressure circulating liquid reservoir 6 through a pipeline, the outlet of the high-pressure liquid reservoir 2 is connected to the liquid inlet of the low-pressure circulating liquid reservoir 6 through a pipeline, and the liquid outlet of the low-pressure circulating liquid reservoir 6 is connected to the inlet of the refrigerant pump 5 through a pipeline. When used for producing pre-cooled concrete, the outlet of the refrigeration compressor 1 is connected to the inlet of the condenser 7 through a pipeline, and the outlet of the condenser 7 is connected to the high-pressure liquid reservoir. 2 is connected through a pipeline, the inlet of the air cooler 3 is connected through a pipeline to the outlet of the refrigerant pump 5, the water cooler 4 is connected through a pipeline to the outlet of the high-pressure liquid accumulator 2, the outlet of the air cooler 3 and the water cooler 4 are both connected through a pipeline to the air inlet of the low-pressure circulating liquid accumulator 6. When used to produce preheated concrete, the inlet of the air cooler 3 and the water cooler 4 are both connected through a pipeline to the outlet of the refrigeration compressor 1, the outlet of the air cooler 3 and the water cooler 4 are both connected through a pipeline to the inlet of the high-pressure liquid accumulator 2, the outlet of the refrigerant pump 5 is connected through a pipeline to the inlet of the condenser 7, and the outlet of the condenser 7 is connected through a pipeline to the air inlet of the low-pressure circulating liquid accumulator 6. The specific working process of producing precooled concrete and producing preheated concrete is as follows:

[0022] When used to produce pre-cooled concrete, the refrigeration compressor 1 discharges the high-temperature and high-pressure refrigerant gas into the condenser 7, and the condenser 7 condenses the high-temperature and high-pressure gas into a high-temperature and high-pressure liquid. The high-temperature and high-pressure liquid flows into the high-pressure liquid reservoir 2. A part of the high-temperature and high-pressure liquid is converted into a low-temperature and low-pressure liquid through cooling and pressure reduction and enters the low-pressure circulation liquid reservoir 6. The low-temperature and low-pressure liquid in the low-pressure circulation liquid reservoir 6 is sent to the air cooler 3 through the refrigerant pump 5. The other part of the high-temperature and high-pressure liquid is converted into a low-temperature and low-pressure liquid through cooling and pressure reduction and enters the water cooler 4. In the air cooler 3 and the water cooler 4, the low-temperature and low-pressure liquid absorbs heat and evaporates into a low-temperature and low-pressure gas, thereby reducing the flow through the air cooler 3. The temperature of the air and the water flowing through the water cooler 3, the cooled air enters the aggregate bin connected to the air cooler 3, pre-cools the aggregate in the aggregate bin, and the water cooled by the water cooler 4 is directly mixed into the aggregate to further achieve pre-cooling. The low-temperature and low-pressure gas contains a large amount of unevaporated liquid. The low-temperature and low-pressure gas enters the low-pressure circulation reservoir 6 for gas-liquid separation. The liquid falls into the lower layer of the low-pressure circulation reservoir 6 and re-enters the air cooler 4 through the refrigerant pump 5 to absorb heat. This process can further pre-cool the aggregate in the aggregate bin. The gas enters the refrigeration compressor in the upper layer of the low-pressure circulation reservoir, is compressed into high-temperature and high-pressure gas in the refrigeration compressor, and enters the next cycle;

[0023] When used to produce preheated concrete, the refrigeration compressor 1 discharges high-temperature and high-pressure refrigerant gas into the air cooler 3 and the water cooler 4. The air cooler 3 and the water cooler 4 condense the high-temperature and high-pressure gas into high-temperature and high-pressure liquid, thereby increasing the temperature of the air flowing through the air cooler 3 and the water flowing through the water cooler 4. The heated air enters the aggregate bin connected to the air cooler 3 to preheat the aggregate in the aggregate bin. The water heated by the water cooler 4 is directly mixed into the aggregate to further preheat the aggregate. The high-temperature and high-pressure liquid flows into the high-pressure liquid reservoir 2 and then becomes a low-temperature and low-pressure liquid through cooling and pressure reduction. The low-temperature and low-pressure liquid in the low-pressure circulating liquid reservoir 6 is sent to the condenser 7 through the refrigerant pump 5. Part of the low-temperature and low-pressure liquid absorbs heat and evaporates in the condenser 7 to become a low-temperature and low-pressure gas. The low-temperature and low-pressure gas contains a large amount of unevaporated liquid. The low-temperature and low-pressure gas returns to the low-pressure circulating liquid reservoir 6 for gas-liquid separation. The liquid falls into the lower layer of the low-pressure circulating liquid reservoir 6 and enters the condenser 7 again through the refrigerant pump 5 to absorb heat. The gas enters the refrigeration compressor 1 in the upper layer of the low-pressure circulating liquid reservoir 6, is compressed into a high-temperature and high-pressure gas in the refrigeration compressor 1, and enters the next cycle.

[0024] The integrated pre-cooling and pre-heating system for concrete production of the present invention utilizes the same equipment and is connected through two different sets of pipes. It can produce both pre-cooled concrete and pre-heated concrete without the need to set up different pre-heating or pre-cooling equipment, thereby greatly simplifying the system structure. Only one group of production and operation personnel is required, which can greatly reduce operating costs. At the same time, it reduces the space occupied and maintenance costs of the pre-cooling and pre-heating systems, reduces pressure vessels, and reduces a major source of danger. At the same time, air coolers and water coolers are provided, which have better pre-cooling or pre-heating effects. When using the integrated pre-cooling and pre-heating system for concrete production of the present invention to produce pre-heated concrete, it has been calculated that under -25 / 40°C working conditions, the theoretical energy efficiency ratio can be increased from 1 to more than 3 compared to the boiler heating method in the prior art, greatly reducing energy consumption costs.

[0025] In this embodiment, a throttle valve 9 is respectively provided on the pipeline between the outlet of the high-pressure liquid reservoir 2 and the liquid inlet of the low-pressure circulating liquid reservoir 6, and on the pipeline between the outlet of the high-pressure liquid reservoir 2 and the water cooler 3. The throttle valve 9 can cool down and reduce the pressure of the high-pressure liquid output by the high-pressure liquid reservoir 2, and then convert it into a low-temperature and low-pressure liquid before entering the liquid inlet of the low-pressure circulating liquid reservoir 6 or the water cooler 3.

[0026] In this embodiment, between the outlet of the refrigeration compressor 1 and the inlet of the condenser 7, between the outlet of the condenser 7 and the inlet of the high-pressure liquid reservoir 2, between the outlet of the refrigerant pump 5 and the inlet of the condenser 7, between the outlet of the refrigerant pump 5 and the inlet of the air cooler 3, between the outlet of the water cooler 4 and the high-pressure liquid reservoir 2, between the outlet of the air cooler 3 and the air inlet of the low-pressure circulation liquid reservoir 6, between the water cooler 4 and the air inlet of the low-pressure circulation liquid reservoir 6, between the inlet of the air cooler 3 and the outlet of the refrigeration compressor 1, between the water cooler 4 and the outlet of the refrigeration compressor 1, and between the outlet of the air cooler 3. Control valves for controlling the on-off of each connecting pipeline are provided on the connecting pipelines between the inlet of the high-pressure liquid reservoir 2, between the water cooler 4 and the inlet of the high-pressure liquid reservoir 2, and between the outlet of the condenser 7 and the air inlet of the low-pressure circulating liquid reservoir 6. The on-off of each connecting pipeline is controlled by the control valve. When it is necessary to switch between preheating concrete production and precooling concrete production, it is only necessary to operate the control valve to realize the change of the connection relationship of the refrigeration compressor 1, high-pressure liquid reservoir 2, air cooler 3, water cooler 4, refrigerant pump 5, low-pressure circulating liquid reservoir 6 and condenser 7. The operation is simple and the operating cost is reduced.

[0027] In this embodiment, the control valve includes a stop valve 8 respectively provided on the connecting pipeline. Figure 1As shown, the two groups of stop valves 8 on the connecting pipe between the outlet of the refrigeration compressor 1 and the inlet of the condenser 7 are 8B and 8G respectively, the two groups of stop valves 8 on the connecting pipe between the outlet of the condenser 7 and the inlet of the high-pressure liquid storage 2 are 8E and 8D respectively, the two groups of stop valves 8 on the connecting pipe between the outlet of the refrigerant pump 5 and the inlet of the condenser 7 are 8I and 8H respectively, the two groups of stop valves 8 on the connecting pipe between the outlet of the refrigerant pump 5 and the inlet of the air cooler 3 are 8J and 8L respectively, the water cooler 4 and the high-pressure liquid storage The stop valves 8 on the connecting pipes between the outlet of the air cooler 2 are 8R, the two sets of stop valves 8 on the connecting pipes between the outlet of the air cooler 3 and the air inlet of the low-pressure circulating liquid accumulator 6 are 8N and 8S, the two sets of stop valves 8 on the connecting pipes between the water cooler 4 and the air inlet of the low-pressure circulating liquid accumulator 6 are 8P and 8T, the two sets of stop valves 8 on the connecting pipes between the inlet of the air cooler 3 and the outlet of the refrigeration compressor 1 are 8M and 8A, the connecting pipes between the water cooler 4 and the outlet of the refrigeration compressor 1 are The two groups of stop valves 8 on the refrigeration compressor are 8Q and 8A respectively, wherein the stop valve 8A is arranged on a common pipeline between the inlet of the air cooler 3 and the outlet of the refrigeration compressor 1 and between the outlet of the water cooler 4 and the refrigeration compressor 1, the two groups of stop valves 8 on the connecting pipeline between the outlet of the air cooler 3 and the inlet of the high-pressure liquid accumulator 2 are 8K and 8C respectively, and the two groups of stop valves 8 on the connecting pipeline between the water cooler 4 and the inlet of the high-pressure liquid accumulator 2 are 8O and 8C respectively, wherein 8C is arranged between the outlet of the air cooler 3 and the high-pressure liquid accumulator 2. On a common pipeline between the inlet of the high-pressure liquid reservoir 2 and between the water cooler 4 and the inlet of the high-pressure liquid reservoir 2, the two groups of stop valves 8 on the connecting pipeline between the outlet of the condenser 7 and the air inlet of the low-pressure circulating liquid reservoir 6 are 8F and 8U respectively; when used for producing pre-cooled concrete, the stop valves 8B, 8G, 8E, 8D, 8J, 8L, 8N, 8S, 8P, 8T, 8R are opened, and the stop valves 8I, 8H, 8F, 8U, 8Q, 8A, 8M, 8O, 8K, 8C are closed. The resulting pipeline connection diagram is shown as follows. Figure 2 When used to produce preheated concrete, open the stop valves 8I, 8H, 8F, 8U, 8Q, 8A, 8M, 8O, 8K, and 8C, and close the stop valves 8B, 8G, 8E, 8D, 8J, 8L, 8N, 8S, 8P, 8T, and 8R. The resulting pipeline connection diagram is shown in FIG. Figure 3 shown.

[0028] In this embodiment, the water cooler 4 is a water cooler with an interchangeable inlet and outlet, which facilitates the connection of pipelines and further simplifies the structure.

[0029] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. An integrated pre-cooling and pre-heating system for concrete production, characterized by: The invention comprises a refrigeration compressor (1), a high-pressure liquid reservoir (2), an air cooler (3), a water cooler (4), a refrigerant pump (5), a low-pressure circulating liquid reservoir (6) and a condenser (7), wherein the inlet of the refrigeration compressor (1) is connected to the air outlet of the low-pressure circulating liquid reservoir (6) through a pipeline, the outlet of the high-pressure liquid reservoir (2) is connected to the liquid inlet of the low-pressure circulating liquid reservoir (6) through a pipeline, the liquid outlet of the low-pressure circulating liquid reservoir (6) is connected to the inlet of the refrigerant pump (5) through a pipeline, and when used for producing pre-cooled concrete, the outlet of the refrigeration compressor (1) is connected to the inlet of the condenser (7) through a pipeline, the outlet of the condenser (7) is connected to the inlet of the high-pressure liquid reservoir (2) through a pipeline, and the inlet of the air cooler (3) is connected to the inlet of the high-pressure liquid reservoir (2). The outlet of the refrigerant pump (5) is connected to the outlet of the high-pressure liquid accumulator (2) through a pipeline, the outlet of the air cooler (3) and the water cooler (4) are both connected to the air inlet of the low-pressure circulating liquid accumulator (6) through a pipeline, and when used to produce preheated concrete, the inlet of the air cooler (3) and the water cooler (4) are both connected to the outlet of the refrigeration compressor (1) through a pipeline, the outlet of the air cooler (3) and the water cooler (4) are both connected to the inlet of the high-pressure liquid accumulator (2) through a pipeline, the outlet of the refrigerant pump (5) is connected to the inlet of the condenser (7) through a pipeline, and the outlet of the condenser (7) is connected to the air inlet of the low-pressure circulating liquid accumulator (6) through a pipeline.

2. The integrated pre-cooling and pre-heating system for concrete production according to claim 1 is characterized in that: A throttle valve (9) is provided on the pipeline between the outlet of the high-pressure liquid reservoir (2) and the liquid inlet of the low-pressure circulating liquid reservoir (6), and on the pipeline between the outlet of the high-pressure liquid reservoir (2) and the water cooler (3).

3. The integrated pre-cooling and pre-heating system for concrete production according to claim 1 or 2, characterized in that: Between the outlet of the refrigeration compressor (1) and the inlet of the condenser (7), between the outlet of the condenser (7) and the inlet of the high-pressure liquid accumulator (2), between the outlet of the refrigerant pump (5) and the inlet of the condenser (7), between the outlet of the refrigerant pump (5) and the inlet of the air cooler (3), between the outlet of the water cooler (4) and the outlet of the high-pressure liquid accumulator (2), between the outlet of the air cooler (3) and the air inlet of the low-pressure circulating liquid accumulator (6), between the outlet of the water cooler (4) and the inlet of the low-pressure circulating liquid accumulator (6), between the outlet of the water cooler (4) and the inlet of the low-pressure circulating liquid accumulator (6), between the outlet of the water cooler (4) and the inlet of the high-pressure liquid accumulator (2). Control valves for controlling the opening and closing of each connecting pipeline are provided on the connecting pipelines between the air inlet of the low-pressure circulating liquid reservoir (6), between the inlet of the air cooler (3) and the outlet of the refrigeration compressor (1), between the outlet of the water cooler (4) and the outlet of the refrigeration compressor (1), between the outlet of the air cooler (3) and the inlet of the high-pressure liquid reservoir (2), between the water cooler (4) and the inlet of the high-pressure liquid reservoir (2), and between the outlet of the condenser (7) and the air inlet of the low-pressure circulating liquid reservoir (6).

4. The integrated pre-cooling and pre-heating system for concrete production according to claim 3 is characterized by: The control valve includes stop valves (8) respectively arranged on the communication pipelines.

5. The integrated pre-cooling and pre-heating system for concrete production according to claim 1 or 2, characterized in that: The water cooler (4) is a water cooler with an interchangeable inlet and outlet.

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