Conveying device for preventing gasification of finished carbon dioxide

Abstract

The utility model provides a conveying device for preventing gasification of finished carbon dioxide, which comprises a carbon dioxide conveying device, the carbon dioxide conveying device comprises a conveying pipeline and a heat exchange structure, the conveying pipeline comprises a first pipeline and a second pipeline, and one end of the heat exchange structure is connected with a carbon dioxide production device through the first pipeline. The other end of the heat exchange structure is connected with the liquid carbon dioxide storage device through a second pipeline, and the refrigeration space of the heat exchange structure communicates with the first pipeline and the second pipeline to provide a cold source for liquid carbon dioxide in the conveying pipeline. According to the utility model, originally liquefied CO2 can be further cooled, so that the gasification effect of the liquefied CO2 is reduced, and the negative influence of the gasification effect on the yield of finished carbon dioxide is reduced; the gas-liquid heat exchange mechanism is arranged, heat exchange is conducted through a low-temperature gas-phase refrigerant and a medium-high-temperature liquid-phase refrigerant, the refrigeration cooling efficiency of liquefied CO2 can be improved, and energy is saved; the device is reasonable in design, simple in structure, convenient to operate and high in practicability.

Description

Technical field:

[0001] The utility model relates to the technical field of carbon dioxide production, in particular to a conveying device for preventing finished carbon dioxide from gasifying. Background technology:

[0002] The production of liquefied carbon dioxide primarily involves converting carbon dioxide gas into liquid form under high pressure and low temperature conditions. As a key industrial raw material, liquid carbon dioxide plays a vital role in the manufacture of soda ash, urea, and soft drinks. It is also used to produce food-grade liquid carbon dioxide, a product widely used in the pharmaceutical, chemical, and other industries, possessing significant application value.

[0003] Currently, in carbon dioxide production and recovery systems, the finished carbon dioxide produced after purification and liquefaction is transported to storage tanks via pumps and pipelines or equipment. However, in factories, the carbon dioxide production and recovery equipment is located a certain distance from the carbon dioxide storage equipment. If the transportation distance is too long, the liquid carbon dioxide is prone to vaporization during pipeline transportation, resulting in a decrease in the amount of finished carbon dioxide in the storage tanks, thereby affecting liquid carbon dioxide production. Therefore, it is necessary to design a transportation device that can prevent the finished carbon dioxide from vaporizing. Summary of the invention:

[0004] The purpose of this utility model is to address the deficiencies of the existing technology and provide a conveying device that prevents the gasification of finished carbon dioxide, which can further cool the originally liquefied carbon dioxide, thereby reducing the gasification effect of the liquefied carbon dioxide and reducing the negative impact of the gasification effect on the output of finished carbon dioxide.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model provides a conveying device for preventing the gasification of finished carbon dioxide, which is characterized in that it comprises a carbon dioxide conveying device, wherein the carbon dioxide conveying device comprises a conveying pipeline and a heat exchange structure; the conveying pipeline comprises a first pipeline and a second pipeline, one end of the heat exchange structure is connected to a carbon dioxide production device through the first pipeline, and the other end of the heat exchange structure is connected to a liquid carbon dioxide storage device through the second pipeline, and a refrigeration space of the heat exchange structure is communicated with the first pipeline and the second pipeline to provide a cold source for the liquid carbon dioxide in the conveying pipeline.

[0007] Furthermore, the heat exchange structure includes a heat exchanger shell; a refrigerant circulation pipe is arranged inside the heat exchanger shell; a refrigerant inlet is arranged at one end of the heat exchanger shell, and a refrigerant outlet is arranged at the other end; the two ends of the refrigerant circulation pipe are respectively connected to the refrigerant inlet and the refrigerant outlet.

[0008] Furthermore, a carbon dioxide circulation pipe is provided inside the heat exchanger shell, and the carbon dioxide circulation pipe is made of heat-conducting material; the two ends of the carbon dioxide circulation pipe are respectively connected to the first pipe and the second pipe; the carbon dioxide circulation pipe is fixedly connected to the heat exchanger shell, and the central axis of the heat exchanger shell and the carbon dioxide circulation pipe coincides; a space for installing a refrigerant circulation pipe is provided between the carbon dioxide circulation pipe and the inner wall of the heat exchanger shell, and the refrigerant circulation pipe is fixedly arranged inside this space.

[0009] Furthermore, the refrigerant circulation pipe is a hollow cylindrical structure formed by winding a metal copper tube, which is sleeved on the outer surface of the carbon dioxide circulation pipe; refrigerant flows inside the metal copper tube to cool the liquefied CO2 inside the carbon dioxide circulation pipe.

[0010] Furthermore, the heat exchange structure also includes a compressor, a condenser, a liquid storage tank and an expansion valve; the refrigerant outlet is connected to the compressor, condenser, liquid storage tank and expansion valve in sequence through pipes, and the expansion valve is connected to the refrigerant inlet through a pipe; a temperature sensing package is provided at the refrigerant outlet for detecting changes in pressure and temperature.

[0011] Furthermore, the device is also provided with a gas-liquid heat exchange mechanism; the gas-liquid heat exchange mechanism includes a gas-liquid heat exchange shell and an inner tube, the inner tube is fixedly arranged inside the gas-liquid heat exchange shell, and there is a gap between the inner tube and the gas-liquid heat exchange shell; the two ends of the inner tube are respectively provided with a gas phase inlet and a gas phase outlet, and the gas phase inlet and the gas phase outlet are respectively connected to the refrigerant outlet and the compressor through pipes; the two ends of the gas-liquid heat exchange shell are respectively provided with a liquid phase inlet and a liquid phase outlet, and the liquid storage tank is provided with a heat exchange inlet and a heat exchange outlet; the liquid phase inlet is connected to the heat exchange outlet through a pipe, and the liquid phase outlet is connected to the heat exchange inlet through a pipe.

[0012] Furthermore, a solenoid valve is provided on the connecting pipe between the expansion valve and the refrigerant inlet; and a solenoid valve is provided on the connecting pipe between the refrigerant outlet and the compressor.

[0013] Furthermore, the device is also provided with a refrigerant recovery device; the refrigerant recovery device is connected to the refrigerant outlet pipe, and a solenoid valve is provided on the connecting pipe between the refrigerant recovery device and the refrigerant outlet.

[0014] Furthermore, the first pipe and the second pipe are both provided with an outer insulation layer, and the inner wall of the heat exchanger shell is provided with an inner insulation layer.

[0015] Furthermore, the outer thermal insulation layer and the inner thermal insulation layer are respectively formed by stacking one or more layers of aerogel felt.

[0016] Furthermore, a pressure sensor is provided inside the liquid carbon dioxide storage device for monitoring the internal air pressure of the liquid carbon dioxide storage device.

[0017] Beneficial effects of the utility model:

[0018] (1) The present invention can further cool the originally liquefied CO2 by arranging a conveying pipeline and a heat exchange structure between the carbon dioxide production device and the liquid carbon dioxide storage device, thereby reducing the gasification effect of the liquefied CO2 and reducing the negative impact of the gasification effect on the production of finished carbon dioxide;

[0019] (2) In the present invention, the heat exchange structure includes a heat exchanger shell and a refrigerant circulation pipe, which facilitates heat exchange between the refrigerant and the liquefied CO2; the refrigerant circulation pipe is a hollow cylindrical structure formed by winding a metal copper tube, which can improve the heat exchange efficiency;

[0020] (3) The utility model is provided with a gas-liquid heat exchange mechanism, which exchanges heat between a low-temperature gas phase refrigerant and a medium- and high-temperature liquid phase refrigerant, thereby improving the refrigeration and cooling efficiency of liquefied CO2 and saving energy;

[0021] (4) The outside of the delivery pipeline and the inside of the heat exchanger shell of the utility model are respectively provided with insulation layers formed by stacking aerogel felt, which provides good insulation effect for the device.

[0022] (5) The utility model has reasonable design, simple structure, convenient operation and strong practicality. Description of the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the heat exchange structure of an embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the gas-liquid heat exchange mechanism of an embodiment of the present utility model;

[0026] The symbols in the accompanying drawings are:

[0027] 1. First pipeline; 2. Second pipeline; 3. Carbon dioxide production device; 4. Liquid carbon dioxide storage device; 5. Heat exchanger shell; 5-1. Refrigerant inlet; 5-2. Refrigerant outlet; 5-3. Refrigerant circulation pipeline; 5-4. Carbon dioxide circulation pipe; 6. Compressor; 7. Condenser; 8. Liquid storage tank; 9. Expansion valve; 10. Refrigerant recovery device; 11. Gas-liquid heat exchange shell; 11-1. Liquid phase inlet; 11-2. Liquid phase outlet; 12. Inner tube; 12-1. Gas phase inlet; 12-2. Gas phase outlet. Specific implementation method:

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] Reference Figure 1 The present invention provides a delivery device for preventing the gasification of finished carbon dioxide, including a carbon dioxide delivery device, the carbon dioxide delivery device including a delivery pipeline and a heat exchange structure. The delivery pipeline includes a first pipeline 1 and a second pipeline 2. One end of the heat exchange structure is connected to a carbon dioxide production device 3 via the first pipeline 1, and the other end of the heat exchange structure is connected to a liquid carbon dioxide storage device 4 via the second pipeline 2. The refrigeration space of the heat exchange structure is in communication with the first pipeline 1 and the second pipeline 2, providing a cooling source for the liquid carbon dioxide in the delivery pipeline.

[0031] During operation, the purified, liquefied CO2 output from the carbon dioxide production unit 3 enters the first pipeline 1 through a solenoid valve. From there, it enters the heat exchange structure. The refrigerant within the heat exchange structure further cools the liquefied CO2, dropping it from -25°C to -28°C at a pressure of 1.8 MPa (system pressure). The cooled liquefied CO2 then enters the second pipeline 2 and ultimately the liquid carbon dioxide storage unit 4.

[0032] In other embodiments of the present invention, a pressure sensor can be provided inside the liquid carbon dioxide storage device 4 to monitor the internal air pressure of the liquid carbon dioxide storage device 4 and further monitor the CO2 gasification situation. On the one hand, the cooling performance of the heat exchange structure can be adjusted, and on the other hand, the gaseous CO2 can be exported in time.

[0033] Example 2

[0034] The main structure of this embodiment is the same as that of embodiment 1, except that this embodiment limits the heat exchange structure.

[0035] Specifically, refer to Figures 1-2 In this embodiment, the heat exchange structure includes a heat exchanger housing 5; a refrigerant flow pipe 5-3 is disposed within the heat exchanger housing 5. A refrigerant inlet 5-1 is disposed at one end of the heat exchanger housing 5, and a refrigerant outlet 5-2 is disposed at the other end. The refrigerant flow pipe 5-3 is connected to the refrigerant inlet 5-1 and the refrigerant outlet 5-2 at both ends, respectively.

[0036] In this embodiment, a carbon dioxide circulation pipe 5-4 is provided inside the heat exchanger shell 5, and the carbon dioxide circulation pipe 5-4 is made of a heat-conducting material. The two ends of the carbon dioxide circulation pipe 5-4 are respectively connected to the first pipe 1 and the second pipe 2. The carbon dioxide circulation pipe 5-4 is fixedly connected to the heat exchanger shell 5, and the central axis of the heat exchanger shell 5 and the carbon dioxide circulation pipe 5-4 coincide. A space for installing a refrigerant circulation pipe 5-3 is provided between the carbon dioxide circulation pipe 5-4 and the inner wall of the heat exchanger shell 5 (this space is a closed and insulated space), and the refrigerant circulation pipe 5-3 is fixedly provided inside this space. Specifically, the refrigerant circulation pipe 5-3 is a hollow cylindrical structure formed by winding a metal copper tube, which is sleeved on the outer surface of the carbon dioxide circulation pipe 5-4. Refrigerant circulates inside the metal copper tube to cool the liquefied CO2 inside the carbon dioxide circulation pipe 5-4.

[0037] During operation, the refrigerant (Freon) enters the refrigerant circulation pipe 5-3 through the refrigerant inlet 5-1, absorbs heat and releases cold energy within the refrigerant circulation pipe 5-3, and is then discharged through the refrigerant outlet 5-2. Simultaneously, liquefied CO2 enters the carbon dioxide circulation pipe 5-4 through the first pipe 1, where it is cooled by the refrigerant circulation pipe 5-3 before entering the liquid carbon dioxide storage device 4 through the second pipe 2.

[0038] Example 3

[0039] The main structure of this embodiment is the same as that of embodiment 2, except that this embodiment further defines the heat exchange structure.

[0040] Specifically, refer to Figure 1 In this embodiment, the heat exchange structure also includes a compressor 6, a condenser 7, a liquid storage tank 8 and an expansion valve 9; the refrigerant outlet 5-2 is connected to the compressor 6, the condenser 7, the liquid storage tank 8 and the expansion valve 8 in sequence through pipelines, and the expansion valve 9 is connected to the refrigerant inlet 5-1 through a pipeline; a temperature sensing package is provided at the refrigerant outlet 5-2 for detecting changes in pressure and temperature.

[0041] In this embodiment, a solenoid valve is provided on the connecting pipe between the expansion valve 9 and the refrigerant inlet 5 - 1 ; and a solenoid valve is provided on the connecting pipe between the refrigerant outlet 5 - 2 and the compressor 6 .

[0042] In this embodiment, the device is further provided with a refrigerant recovery device 10. The refrigerant recovery device 10 is connected to the refrigerant outlet 5-2 pipeline, and a solenoid valve is provided on the connecting pipeline between the refrigerant recovery device 10 and the refrigerant outlet 5-2.

[0043] After being discharged through refrigerant outlet 5-2, the refrigerant (Freon) enters compressor 6 as a high-temperature, high-pressure gas. It then enters condenser 7, where it is condensed into a liquid and stored in liquid storage tank 8. The liquid refrigerant in liquid storage tank 8 then enters expansion valve 9 for decompression and cooling, ultimately reentering refrigerant circulation pipe 5-3 through refrigerant inlet 5-1 to serve as a cooling source. This cycle repeats, cooling the liquefied CO2 in carbon dioxide circulation pipe 5-4.

[0044] Example 4

[0045] The main structure of this embodiment is the same as that of embodiment 3, except that: in this embodiment, a gas-liquid heat exchange mechanism is also provided.

[0046] Reference Figure 3 In this embodiment, the gas-liquid heat exchange mechanism includes a gas-liquid heat exchange shell 11 and an inner tube 12. The inner tube 12 is fixedly arranged inside the gas-liquid heat exchange shell 11, and there is a gap between the inner tube 12 and the gas-liquid heat exchange shell 11 (sealed and insulated).

[0047] In this embodiment, a gas phase inlet 12-1 and a gas phase outlet 12-2 are provided at both ends of the inner tube 12, and the gas phase inlet 12-1 and the gas phase outlet 12-2 are connected to the refrigerant outlet 5-2 and the compressor 6 respectively through pipes. A liquid phase inlet 11-1 and a liquid phase outlet 11-2 are provided at both ends of the gas-liquid heat exchange shell 11, and the liquid storage tank 8 is provided with a heat exchange inlet and a heat exchange outlet, and the liquid phase inlet 11-1 is connected to the heat exchange outlet through a pipe, and the liquid phase outlet 11-2 is connected to the heat exchange inlet through a pipe.

[0048] During operation, the low-temperature gas-phase refrigerant output from the refrigerant outlet 5-2 enters the inner tube 12 through the gas-phase inlet 12-1. The medium- and high-temperature liquid-phase refrigerant in the liquid storage tank enters the space formed by the inner tube 12 and the gas-liquid heat exchange shell 11 through the heat exchange outlet and the liquid-phase inlet 11-1. At this time, the low-temperature gas-phase refrigerant and the medium- and high-temperature liquid-phase refrigerant exchange heat. After heat exchange, the low-temperature gas-phase refrigerant enters the compressor 6 through the gas-phase outlet 12-2 and related pipelines, and the medium- and high-temperature liquid-phase refrigerant returns to the liquid storage tank 8 through the liquid-phase outlet 11-2 and related pipelines. This embodiment improves the refrigeration and cooling efficiency of liquefied CO2 by exchanging heat between the low-temperature gas-phase refrigerant and the medium- and high-temperature liquid-phase refrigerant, saving energy.

[0049] Example 5

[0050] This embodiment has the same main structure as that of embodiment 4, except that: in this embodiment, an outer insulation layer is provided on the first pipe 1 and the second pipe 2, and an inner insulation layer is provided on the inner wall of the heat exchanger shell 5, wherein the outer insulation layer and the inner insulation layer are respectively formed by stacking one or more layers of aerogel felt, thereby providing a good insulation effect for the device.

[0051] The above are only preferred implementation methods of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A conveying device for preventing the gasification of finished carbon dioxide, characterized in that: It includes a carbon dioxide delivery device, which includes a delivery pipeline and a heat exchange structure; The delivery pipeline comprises a first pipeline (1) and a second pipeline (2); one end of the heat exchange structure is connected to a carbon dioxide production device (3) via the first pipeline (1); the other end of the heat exchange structure is connected to a liquid carbon dioxide storage device (4) via the second pipeline (2); a refrigeration space of the heat exchange structure is in communication with the first pipeline (1) and the second pipeline (2), providing a cold source for the liquid carbon dioxide in the delivery pipeline.

2. The conveying device for preventing the gasification of finished product carbon dioxide according to claim 1, characterized in that: The heat exchange structure includes a heat exchanger shell (5); A refrigerant circulation pipe (5-3) is provided inside the heat exchanger shell (5); a refrigerant inlet (5-1) is provided at one end of the heat exchanger shell (5), and a refrigerant outlet (5-2) is provided at the other end; and both ends of the refrigerant circulation pipe (5-3) are respectively connected to the refrigerant inlet (5-1) and the refrigerant outlet (5-2).

3. The conveying device for preventing finished product carbon dioxide from gasifying according to claim 2, characterized in that: A carbon dioxide circulation pipe (5-4) is provided inside the heat exchanger shell (5), and the carbon dioxide circulation pipe (5-4) is made of a heat-conducting material; both ends of the carbon dioxide circulation pipe (5-4) are respectively connected to the first pipe (1) and the second pipe (2); The carbon dioxide circulation pipe (5-4) is fixedly connected to the heat exchanger shell (5), and the central axis of the heat exchanger shell (5) and the carbon dioxide circulation pipe (5-4) coincide with each other; A space for installing a refrigerant circulation pipe (5-3) is provided between the carbon dioxide circulation pipe (5-4) and the inner wall of the heat exchanger shell (5), and the refrigerant circulation pipe (5-3) is fixedly arranged inside the space.

4. The conveying device for preventing the gasification of finished product carbon dioxide according to claim 3, characterized in that: The refrigerant circulation pipe (5-3) is a hollow cylindrical structure formed by winding a metal copper tube, and is sleeved on the outer surface of the carbon dioxide circulation pipe (5-4); refrigerant circulates inside the metal copper tube to cool the liquefied CO2 inside the carbon dioxide circulation pipe (5-4).

5. The conveying device for preventing the gasification of finished product carbon dioxide according to claim 2, characterized in that: The heat exchange structure further includes a compressor (6), a condenser (7), a liquid storage tank (8) and an expansion valve (9); The refrigerant outlet (5-2) is connected to the compressor (6), the condenser (7), the liquid storage tank (8) and the expansion valve (9) in sequence through pipelines, and the expansion valve (9) is connected to the refrigerant inlet (5-1) through a pipeline; A temperature sensing package is provided at the refrigerant outlet (5-2) for detecting changes in pressure and temperature.

6. The conveying device for preventing the finished product from gasifying carbon dioxide according to claim 5, characterized in that: A gas-liquid heat exchange mechanism is also provided; The gas-liquid heat exchange mechanism comprises a gas-liquid heat exchange outer shell (11) and an inner tube (12), wherein the inner tube (12) is fixedly arranged inside the gas-liquid heat exchange outer shell (11), and a gap is provided between the inner tube (12) and the gas-liquid heat exchange outer shell (11); A gas phase inlet (12-1) and a gas phase outlet (12-2) are respectively provided at both ends of the inner tube (12), and the gas phase inlet (12-1) and the gas phase outlet (12-2) are respectively connected to the refrigerant outlet (5-2) and the compressor (6) through pipelines; The two ends of the gas-liquid heat exchange shell (11) are respectively provided with a liquid phase inlet (11-1) and a liquid phase outlet (11-2), and the liquid storage tank (8) is provided with a heat exchange inlet and a heat exchange outlet; the liquid phase inlet (11-1) is connected to the heat exchange outlet via a pipeline, and the liquid phase outlet (11-2) is connected to the heat exchange inlet via a pipeline.

7. The conveying device for preventing the gasification of finished product carbon dioxide according to claim 5, characterized in that: A solenoid valve is provided on the connecting pipe between the expansion valve (9) and the refrigerant inlet (5-1); A solenoid valve is provided on the connecting pipe between the refrigerant outlet (5-2) and the compressor (6).

8. The conveying device for preventing finished product carbon dioxide from gasifying according to claim 2, characterized in that: A refrigerant recovery device (10) is also provided; The refrigerant recovery device (10) is connected to the refrigerant outlet (5-2) pipeline, and a solenoid valve is provided on the connecting pipeline between the refrigerant recovery device (10) and the refrigerant outlet (5-2).

9. The conveying device for preventing finished product carbon dioxide from gasifying according to claim 2, characterized in that: The first pipe (1) and the second pipe (2) are both provided with an outer insulation layer. An inner insulation layer is provided on the inner wall of the heat exchanger shell (5); The outer thermal insulation layer and the inner thermal insulation layer are respectively formed by stacking one or more layers of aerogel felt.

10. The conveying device for preventing finished product carbon dioxide from gasifying according to claim 1, characterized in that: A pressure sensor is provided inside the liquid carbon dioxide storage device (4) for monitoring the internal air pressure of the liquid carbon dioxide storage device (4).

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