Dry ice tail gas recycling device

Abstract

The invention relates to the technical field of dry ice manufacturing, and discloses a dry ice tail gas recycling device which comprises a tail gas exhaust channel, a first heat exchanger, a second heat exchanger, a refrigerant pipeline and a gas channel, the first heat exchanger is located in the tail gas exhaust channel, and the second heat exchanger is located in the gas channel. A refrigerant circulation loop is formed between the first heat exchanger and the second heat exchanger through a refrigerant pipeline. The device has the following advantages and effects that a refrigerant circularly flows in the refrigerant circulation loop and exchanges heat with dry ice tail gas in the tail gas emission channel through the first heat exchanger, and the cooled refrigerant exchanges heat with carbon dioxide in the gas channel through the second heat exchanger; the cooling capacity of the dry ice tail gas is used for cooling the carbon dioxide gas, energy consumption in the cooling process of the carbon dioxide gas is reduced, meanwhile, the filtered dry ice tail gas is used for preparing dry ice again, and the effects of recycling the dry ice tail gas and protecting the environment are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of dry ice, and in particular to a dry ice tail gas recovery and utilization device. Background Art

[0002] Dry ice is a white crystal that sublimates easily at room temperature and has a high heat of vaporization. It is chemically stable, odorless, non-toxic, non-flammable, and does not support combustion. Dry ice is used in scenarios such as artificial rainfall, equipment and item cleaning, cold chain transportation, and decorative special effects.

[0003] The production process of dry ice mainly includes the following steps: Preparation of carbon dioxide: usually through industrial methods, such as collecting carbon dioxide from waste gas of chemical plants, fermentation plants, etc., or through chemical methods such as the reaction of carbonates with acids to produce carbon dioxide. Purification of carbon dioxide: the produced carbon dioxide gas may contain impurities, such as moisture, oil, dust, etc., and needs to be purified by filtering, adsorption, drying and other methods to obtain purified carbon dioxide gas. Compression and cooling: the purified carbon dioxide gas is compressed to a certain pressure and cooled to a low temperature by a cooling device. Formation of liquid carbon dioxide: under high pressure and low temperature conditions, carbon dioxide gas is converted into liquid carbon dioxide. Manufacturing of dry ice: the liquid carbon dioxide is solidified by a dry ice machine and then molded. Collection and storage of dry ice: the formed dry ice is collected by a special collection device and stored in a low-temperature, insulated container to maintain its solid and low-temperature state.

[0004] During the dry ice production process, low-temperature exhaust gas is generated and discharged. The exhaust gas contains carbon dioxide, which not only wastes refrigeration but also emits carbon dioxide in the exhaust gas, resulting in high energy consumption and high cost in dry ice production. Summary of the invention

[0005] The purpose of the present invention is to provide a dry ice tail gas recovery and utilization device, which has the effect of recovering and utilizing the cold energy of dry ice tail gas.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a dry ice exhaust gas recovery and utilization device, including an exhaust gas emission channel, a first heat exchanger, a second heat exchanger, a refrigerant pipeline, and a gas channel, wherein the first heat exchanger is located in the exhaust gas emission channel, the second heat exchanger is located in the gas channel, and a refrigerant circulation loop is formed between the first heat exchanger and the second heat exchanger through the refrigerant pipeline.

[0007] By adopting the above technical solution, there is low-temperature dry ice exhaust gas in the exhaust gas discharge channel, and there is circulating refrigerant in the refrigerant circulation loop. The refrigerant exchanges heat with the dry ice exhaust gas through the first heat exchanger in the exhaust gas discharge channel, and the refrigerant temperature decreases. The low-temperature refrigerant flows to the second heat exchanger and exchanges heat with the carbon dioxide gas in the gas channel. The carbon dioxide gas cools down and the refrigerant heats up, thereby reducing the energy consumption of cooling the carbon dioxide gas in subsequent production processes, thereby achieving the effect of recycling the coldness of the dry ice exhaust gas, reducing energy consumption, and reducing the cost of dry ice production.

[0008] The present invention is further configured as follows: the first heat exchanger is a heat exchange coil, and the heat exchange coil is formed by bending a copper tube multiple times.

[0009] The present invention is further configured as follows: the second heat exchanger includes a plurality of heat exchange units, the plurality of heat exchange units are distributed in sequence along the length direction of the gas channel, the refrigerant pipeline includes two main pipelines and a plurality of primary branch pipes connected to the main pipelines, and the plurality of primary branch pipes on each of the main pipelines respectively correspond to a plurality of the heat exchange units.

[0010] By adopting the above technical solution, the carbon dioxide gas flows through multiple heat exchange units to obtain sufficient heat exchange and temperature reduction.

[0011] The present invention is further configured as follows: the heat exchange unit includes an upper bushing, a lower bushing, and a plurality of heat exchange tubes; the primary branch pipe is connected to a plurality of secondary branch pipes A and secondary branch pipes B; both ends of the heat exchange tube are respectively connected to two of the secondary branch pipes A; the upper and lower ends of the upper bushing are respectively connected to two of the secondary branch pipes B; and the upper and lower ends of the lower bushing are respectively connected to two of the secondary branch pipes B.

[0012] By adopting the above technical solution, there is refrigerant in the upper bushing, the lower bushing and the heat exchange tube to achieve heat exchange of carbon dioxide gas. The reason why the heat exchange unit is designed as an upper bushing, a lower bushing and a heat exchange tube is to meet the high efficiency when a large amount of carbon dioxide gas passes through in the large-scale industrial production process, and to achieve cooling.

[0013] The present invention is further configured as follows: the upper bushing is formed with a plurality of upper sliding holes, the lower bushing is formed with a plurality of lower sliding holes, the upper and lower ends of the heat exchange tube are respectively slidably connected in the upper sliding hole and the lower sliding hole, the upper bushing is installed with a plurality of upper springs, the elastic force of the upper springs presses the upper end of the heat exchange tube against the inner wall of one end of the upper sliding hole, and a plurality of the upper sliding holes contact the inner wall of one end of the heat exchange tube and are staggered in the horizontal direction; the lower bushing is installed with a plurality of lower springs, the elastic force of the lower springs presses the lower end of the heat exchange tube against the inner wall of one end of the lower sliding hole, and a plurality of the lower sliding holes contact the inner wall of one end of the heat exchange tube and are staggered in the horizontal direction.

[0014] By adopting the above technical solution, in the actual production process, the industrially produced carbon dioxide gas will inevitably contain impurities. After a period of use, the outer wall of the heat exchange unit needs to be cleaned to meet the requirements of heat exchange efficiency.

[0015] The inner walls of one end of several upper sliding holes are staggered, and the inner walls of one end of several lower sliding holes are staggered, the purpose of which is to stagger the heat exchange tubes, guide the flow and reversal of the flowing carbon dioxide gas, and improve the heat exchange efficiency. It can well balance the heat exchange efficiency of carbon dioxide and the passing efficiency of large-scale gas.

[0016] When cleaning is required, the position of the heat exchange tube is adjusted to be in a convenient position for cleaning. After cleaning the surface, it is released and reset by the elastic force of the upper spring and the lower spring.

[0017] The present invention is further configured as follows: the heat exchange unit also includes an adjusting frame, the adjusting frame is sleeved on the upper bushing and the lower bushing, the upper bushing is provided with a plurality of upper slide seats, the lower bushing is provided with a plurality of lower slide seats, the adjusting frame is provided with a plurality of upper slide grooves and a plurality of lower slide grooves, the upper slide seat is embedded in the upper slide groove, the lower slide seat is embedded in the lower slide groove, and when the adjusting frame slides, it contacts and pushes the heat exchange tube to move.

[0018] By adopting the above technical solution, the adjustment frame is adjusted to drive the heat exchange tubes to move, so that the movement of all the heat exchange tubes can be adjusted at one time.

[0019] The present invention is further configured as follows: the heat exchange unit further comprises a connection frame, and the upper bushing and the lower bushing are both fixed on the connection frame.

[0020] By adopting the above technical solution, one of the functions of the connecting frame is to connect and fix the upper bushing and the lower bushing.

[0021] The present invention is further configured as follows: the gas channel includes a plurality of pipe segment units, two adjacent pipe segment units are connected by flanges, the connecting frame in each heat exchange unit is fixed to the inner wall of one of the pipe units, and the upper bushing, lower bushing and heat exchange tube are all located in adjacent pipe units.

[0022] By adopting the above technical solution, when it is necessary to clean the upper bushing, the lower bushing and the outer wall of the heat exchange tube, the pipe section unit is directly disassembled and separated. At this time, the upper bushing, the lower bushing and the heat exchange tube are all exposed to the outside, which is convenient for cleaning.

[0023] The present invention is further configured as follows: a circulation pump is installed on the refrigerant circulation loop.

[0024] By adopting the above technical solution, the circulating pump is used to pump the refrigerant so that the refrigerant circulates in the refrigerant circulation loop.

[0025] The present invention is further configured as follows: the tail gas emission pipeline is connected to a recovery pipeline, and a filtering device is installed on the recovery pipeline.

[0026] By adopting the above technical solution, the filtering device is used to filter the dry ice exhaust gas, and the filtered dry ice exhaust gas is used again for dry ice manufacturing.

[0027] The beneficial effects of the present invention are as follows: the present invention uses the refrigerant circulating in the refrigerant circulation loop, and the refrigerant exchanges heat with the dry ice exhaust gas in the exhaust gas discharge channel through the first heat exchanger. The cooled refrigerant exchanges heat with the carbon dioxide in the gas channel through the second heat exchanger, and the cold capacity of the dry ice exhaust gas is used to cool the carbon dioxide gas, thereby reducing the energy consumption in the cooling process of the carbon dioxide gas. At the same time, the filtered dry ice exhaust gas is used again for the preparation of dry ice, thereby achieving the effect of recycling the dry ice exhaust gas and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 It is a schematic diagram of the positional relationship between the pipeline unit and the heat exchange unit of the present invention.

[0031] Figure 3 It is a schematic diagram of the heat exchange unit structure of this reaction.

[0032] In the figure, 1. exhaust gas emission channel; 2. first heat exchanger; 3. second heat exchanger; 31. heat exchange unit; 311. upper bushing; 312. lower bushing; 313. heat exchange tube; 314. adjustment frame; 315. connection frame; 32. upper sliding hole; 33. lower sliding hole; 34. spring; 4. refrigerant pipeline; 41. main pipeline; 42. primary branch pipe; 5. gas channel; 51. pipeline unit; 6. circulation pump; 7. recovery pipeline. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] A dry ice tail gas recovery and utilization device, such as Figure 1 As shown, it includes an exhaust gas emission channel 1, a first heat exchanger 2, a second heat exchanger 3, a refrigerant pipeline, and a gas channel 5. The first heat exchanger 2 is located in the exhaust gas emission channel 1, the second heat exchanger 3 is located in the gas channel 5, and a refrigerant circulation loop is formed between the first heat exchanger 2 and the second heat exchanger 3 through the refrigerant pipeline.

[0035] Furthermore, the first heat exchanger 2 is a heat exchange coil, and the heat exchange coil is formed by bending a copper tube multiple times.

[0036] Furthermore, the second heat exchanger 3 includes a plurality of heat exchange units 31, and the plurality of heat exchange units 31 are distributed in sequence along the length direction of the gas channel 5. The refrigerant pipeline 4 includes two main pipelines 41 and a plurality of primary branch pipes 42 connected to the main pipelines 41. The plurality of primary branch pipes 42 on each of the main pipelines 41 correspond to the plurality of heat exchange units 31 respectively.

[0037] Furthermore, the heat exchange unit 31 includes an upper sleeve 311, a lower sleeve 312, and a plurality of heat exchange tubes 313. The primary branch pipe 42 is connected to a plurality of secondary branch pipes A and secondary branch pipes B. Both ends of the heat exchange tube 313 are respectively connected to two of the secondary branch pipes A. The upper and lower ends of the upper sleeve 311 are respectively connected to two of the secondary branch pipes B. The upper and lower ends of the lower sleeve 312 are respectively connected to two of the secondary branch pipes B.

[0038] Furthermore, the upper bushing 311 is formed with a plurality of upper sliding holes 32, and the lower bushing 312 is formed with a plurality of lower sliding holes 33. The upper and lower ends of the heat exchange tube 313 are respectively slidably connected in the upper sliding hole 32 and the lower sliding hole 33. The upper bushing 311 is installed with a plurality of upper springs 34. The elastic force of the upper springs 34 presses the upper end of the heat exchange tube 313 against the inner wall of one end of the upper sliding hole 32. The inner wall of one end of the heat exchange tube 313 is staggered and distributed in the horizontal direction. The lower bushing 312 is installed with a plurality of lower springs 34. The elastic force of the lower springs 34 presses the lower end of the heat exchange tube 313 against the inner wall of one end of the lower sliding hole 33. The inner wall of one end of the heat exchange tube 313 is staggered and distributed in the horizontal direction.

[0039] Furthermore, the heat exchange unit 31 also includes an adjustment frame 314, and the adjustment frame 314 is sleeved on the upper bushing 311 and the lower bushing 312. The upper bushing 311 is provided with a plurality of upper slide seats, and the lower bushing 312 is provided with a plurality of lower slide seats. The adjustment frame 314 is provided with a plurality of upper slide grooves and a plurality of lower slide grooves. The upper slide seat is embedded in the upper slide groove, and the lower slide seat is embedded in the lower slide groove. When the adjustment frame 314 slides, it contacts and pushes the heat exchange tube 313 to move.

[0040] Furthermore, the heat exchange unit 31 further includes a connection frame 315 , and the upper bushing 311 and the lower bushing 312 are both fixed on the connection frame 315 .

[0041] Furthermore, the gas channel 5 includes a plurality of pipe segment units, and two adjacent pipe segment units are connected by flanges. The connecting frame 315 in each heat exchange unit 31 is fixed to the inner wall of one of the pipe units 51 , and the upper bushing 311 , the lower bushing 312 , and the heat exchange tube 313 are all located in adjacent pipe units 51 .

[0042] Furthermore, a circulation pump 6 is installed on the refrigerant circulation loop.

[0043] Furthermore, the tail gas emission pipeline is connected to a recovery pipeline 7 , and a filtering device is installed on the recovery pipeline 7 .

[0044] Working principle: There is low-temperature dry ice exhaust gas in the exhaust gas discharge channel 1, and there is circulating refrigerant in the refrigerant circulation loop. The refrigerant exchanges heat with the dry ice exhaust gas through the first heat exchanger 2 in the exhaust gas discharge channel 1, and the refrigerant temperature decreases. The low-temperature refrigerant flows to the second heat exchanger 3 and exchanges heat with the carbon dioxide gas in the gas channel 5. The carbon dioxide gas cools down and the refrigerant heats up, which reduces the energy consumption of cooling the carbon dioxide gas in the subsequent production process, and achieves the effect of recycling the coldness of the dry ice exhaust gas, reducing energy consumption, and reducing the cost of dry ice production.

Claims

1. A dry ice tail gas recovery and utilization device, characterized in that: The invention comprises an exhaust gas emission channel (1), a first heat exchanger (2), a second heat exchanger (3), a refrigerant pipeline, and a gas channel (5); the first heat exchanger (2) is located in the exhaust gas emission channel (1), the second heat exchanger (3) is located in the gas channel (5), and a refrigerant circulation loop is formed between the first heat exchanger (2) and the second heat exchanger (3) via the refrigerant pipeline.

2. The dry ice tail gas recovery and utilization device according to claim 1, characterized in that: The first heat exchanger (2) is a heat exchange coil, and the heat exchange coil is formed by bending a copper tube multiple times.

3. The dry ice tail gas recovery and utilization device according to claim 1, characterized in that: The second heat exchanger (3) includes a plurality of heat exchange units (31), and the plurality of heat exchange units (31) are distributed in sequence along the length direction of the gas channel (5). The refrigerant pipeline (4) includes two main pipelines (41) and a plurality of primary branch pipes (42) connected to the main pipelines (41). The plurality of primary branch pipes (42) on each of the main pipelines (41) respectively correspond to the plurality of heat exchange units (31).

4. A dry ice tail gas recovery and utilization device according to claim 3, characterized in that: The heat exchange unit (31) comprises an upper bushing (311), a lower bushing (312), and a plurality of heat exchange tubes (313); the primary branch pipe (42) is connected to a plurality of secondary branch pipes A and secondary branch pipes B; both ends of the heat exchange tube (313) are respectively connected to two of the secondary branch pipes A; the upper and lower ends of the upper bushing (311) are respectively connected to two of the secondary branch pipes B; and the upper and lower ends of the lower bushing (312) are respectively connected to two of the secondary branch pipes B.

5. A dry ice tail gas recovery and utilization device according to claim 4, characterized in that: The upper bushing (311) is formed with a plurality of upper sliding holes (32), and the lower bushing (312) is formed with a plurality of lower sliding holes (33). The upper and lower ends of the heat exchange tube (313) are respectively slidably connected in the upper sliding hole (32) and the lower sliding hole (33). The upper bushing (311) is installed with a plurality of upper springs (34). The elastic force of the upper springs (34) presses the upper end of the heat exchange tube (313) against the inner wall of one end of the upper sliding hole (32). The plurality of upper sliding holes (32) contact the inner wall of one end of the heat exchange tube (313) and are staggered in the horizontal direction. The lower bushing (312) is installed with a plurality of lower springs (34). The elastic force of the lower springs (34) presses the lower end of the heat exchange tube (313) against the inner wall of one end of the lower sliding hole (33). The plurality of lower sliding holes (33) contact the inner wall of one end of the heat exchange tube (313) and are staggered in the horizontal direction.

6. A dry ice tail gas recovery and utilization device according to claim 5, characterized in that: The heat exchange unit (31) also includes an adjustment frame (314), and the adjustment frame (314) is sleeved on the upper bushing (311) and the lower bushing (312). The upper bushing (311) is provided with a plurality of upper slide seats, and the lower bushing (312) is provided with a plurality of lower slide seats. The adjustment frame (314) is provided with a plurality of upper slide grooves and a plurality of lower slide grooves. The upper slide seat is embedded in the upper slide groove, and the lower slide seat is embedded in the lower slide groove. When the adjustment frame (314) slides, it contacts and pushes the heat exchange tube (313) to move.

7. The dry ice tail gas recovery and utilization device according to claim 6, characterized in that: The heat exchange unit (31) further comprises a connection frame (315), and the upper bushing (311) and the lower bushing (312) are both fixed on the connection frame (315).

8. The dry ice tail gas recovery and utilization device according to claim 7, characterized in that: The gas channel (5) comprises a plurality of pipe segment units, and two adjacent pipe segment units are connected via flanges. The connection frame (315) in each heat exchange unit (31) is fixed to the inner wall of one of the pipe units (51), and the upper bushing (311), the lower bushing (312), and the heat exchange tube (313) are all located in adjacent pipe units (51).

9. The dry ice tail gas recovery and utilization device according to claim 1, characterized in that: A circulation pump (6) is installed on the refrigerant circulation loop.

10. The dry ice tail gas recovery and utilization device according to claim 1, characterized in that: The tail gas emission pipeline is connected to a recovery pipeline (7), and a filtering device is installed on the recovery pipeline (7).

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