Dry ice recovery system

Abstract

The utility model relates to a dry ice recovery system, which belongs to the technical field of dry ice recovery systems and comprises a dry ice recovery compressor, and the left side of the dry ice recovery compressor is communicated with an air inlet pipe. According to the dry ice recovery system and the dry ice production line tail gas, after the tail gas is conveyed into the dry ice recovery compressor through the air inlet pipe to be compressed, the compressed raw material gas enters the first dry ice tail gas heat exchanger by opening a first electromagnetic valve in the exhaust structure, and one adsorption operation cycle is completed by opening a second electromagnetic valve in the first communication structure; gas flow passing through the tail gas drying bed enters a second dry ice tail gas heat exchanger, then enters a dry ice tail gas liquefier through a fixed pipe and then enters a dry ice tail gas rectifying tower, and carbon dioxide which can reach the national food-grade standard through the dry ice tail gas rectifying tower passes through a subcooler and then enters the dry ice tail gas liquefier. And storing in a food-grade carbon dioxide storage tank to serve as a raw material for subsequent dry ice manufacturing.

Description

TECHNICAL FIELD

[0001] The utility model relates to dry ice recycling system technical field, concretely is a kind of dry ice recycling system. BACKGROUND

[0002] Dry ice is solid carbon dioxide, now dry ice has been widely applied to many fields, with the advancement of industrialization and the improvement of people's pursuit of life quality, the demand of dry ice is more and more, dry ice can be produced by dry ice manufacturing machine.

[0003] For example, China patent CN220206164U discloses a production dry ice process tail gas recovery system, belongs to dry ice tail gas recovery technical field;The utility model is provided with liquid carbon dioxide storage tank;Dry ice machine, it is communicated with the liquid carbon dioxide storage tank by pipeline;And tail gas recovery pipeline, it is communicated with the dry ice machine tail gas outlet, the tail gas recovery pipeline is sequentially provided with air bag, compressor, separator;The separator setting liquid discharge pipe is communicated with rectifying device, the liquid outlet of rectifying device is communicated with the liquid carbon dioxide storage tank by carbon dioxide conveying pipeline, the utility model realizes the recycling of dry ice tail gas generated in the production process of dry ice, has the beneficial effect of improving economic benefit, protecting environment, eliminating frostbite hidden danger.

[0004] The above patent realizes the recycling of dry ice tail gas generated in the production process of dry ice, has the beneficial effect of improving economic benefit, protecting environment, eliminating frostbite hidden danger, but the tail gas purity of the dry ice production process tail gas recovery system in the patent is general, thereby reducing practicability. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of prior art, the utility model provides a kind of dry ice recycling system, with the advantages of improving the purity of dry ice tail gas recovery, solve the tail gas purity of the dry ice production process tail gas recovery system recovered, thereby reduce the problem of practicability.

[0006] To achieve the above object, the utility model provides the following technical scheme: dry ice recycling system, including dry ice recycling compressor, the left side of the dry ice recycling compressor is communicated with inlet pipe, the upper surface of the dry ice recycling compressor is provided with support rod on the left and right sides, the top of the support rod of left and right sides is provided with first dry ice tail gas heat exchanger, the outlet end of the upper surface of the dry ice recycling compressor is communicated with exhaust structure, the top of the exhaust structure is communicated with the inlet end of the lower surface of first dry ice tail gas heat exchanger, the right side of the first dry ice tail gas heat exchanger is provided with connecting mechanism;

[0007] The connecting mechanism comprises a communication pipe, a first communication structure, a second communication structure, a support table, two tail gas drying beds, a second dry ice tail gas heat exchanger and a connecting assembly, the left side of the communication pipe is in communication with the gas outlet end of the first dry ice tail gas heat exchanger, the top ends of the first communication structure and the second communication structure are in communication with the lower surface of the communication pipe, the two tail gas drying beds are arranged on the left and right sides of the upper surface of the support table, the first communication structure and the second communication structure are in communication with the gas inlet ends on the upper surfaces of the left and right tail gas drying beds, and the second dry ice tail gas heat exchanger is arranged on the front face of the right tail gas drying bed.

[0008] The connecting assembly comprises a third communication structure, a fourth communication structure, a fixed pipe, a dry ice tail gas liquefier, a dry ice tail gas rectifying tower, a fixed cylinder and a drying adsorption structure, the top end of the third communication structure is in communication with the first gas inlet end on the lower surface of the second dry ice tail gas heat exchanger, the back face of the third communication structure is in communication with the gas outlet end on the front face of the left tail gas drying bed, the top end of the fourth communication structure is in communication with the second gas inlet end on the lower surface of the second dry ice tail gas heat exchanger, the back face of the fourth communication structure is in communication with the gas outlet end on the front face of the right tail gas drying bed, the dry ice tail gas liquefier is arranged on the left side of the dry ice tail gas rectifying tower, the left side of the fixed pipe is in communication with the gas outlet end on the right side of the second dry ice tail gas heat exchanger, and the right side of the fixed pipe is in communication with the left gas inlet end of the dry ice tail gas liquefier.

[0009] By adopting the technical scheme, the purity of the dry ice tail gas recovery is improved, the economic benefit is improved, and the environment is protected.

[0010] Further, the output end of the dry ice tail gas liquefier is in communication with the input end of the dry ice tail gas rectifying tower through a pipeline, the fixed cylinder is in communication with the gas outlet end on the top end of the dry ice tail gas rectifying tower, and the drying adsorption structure is in communication with the top end of the fixed cylinder.

[0011] By adopting the technical scheme, the purity of the tail gas recovery can be improved through the dry ice tail gas rectifying tower.

[0012] Further, the exhaust structure comprises a first connecting pipe, the outer side of the top end of the first connecting pipe is in communication with a first electromagnetic valve, and the inside of the first electromagnetic valve is in communication with a second connecting pipe.

[0013] By adopting the technical scheme, the tail gas in the dry ice recovery compressor can be transported to the first dry ice tail gas heat exchanger.

[0014] Further, the first communication structure comprises a third connecting pipe, the outer side of the top end of the third connecting pipe is in communication with a second electromagnetic valve, and the inside of the second electromagnetic valve is in communication with a fourth connecting pipe.

[0015] By adopting the technical scheme, the tail gas can be transported.

[0016] Further, the second communication structure comprises a fifth connecting pipe, and an outer side of a top end of the fifth connecting pipe is communicated with a third electromagnetic valve, and an inner side of the third electromagnetic valve is communicated with a sixth connecting pipe.

[0017] By adopting the technical scheme, the second communication structure can be used to transport the tail gas.

[0018] Further, the third communication structure comprises a seventh connecting pipe, and an outer side of a top end of the seventh connecting pipe is communicated with a fourth electromagnetic valve, and an inner side of the fourth electromagnetic valve is communicated with an eighth connecting pipe, and the fourth communication structure comprises a ninth connecting pipe, and an outer side of a top end of the ninth connecting pipe is communicated with a fifth electromagnetic valve, and an inner side of the fifth electromagnetic valve is communicated with a tenth connecting pipe.

[0019] By adopting the technical scheme, the third communication structure and the fourth communication structure can be used to transport the tail gas.

[0020] Further, the inner side of the fixed cylinder is provided with heating wires in a number of not less than two.

[0021] By adopting the technical scheme, the residual gas can be heated.

[0022] Further, the drying and adsorbing structure comprises a drying box, an upper surface of the drying box is communicated with a first output pipe, a top end of the first output pipe is communicated with an adsorbing box, an upper surface of the adsorbing box is communicated with a second output pipe, the inner side of the adsorbing box is provided with filter cotton in a number of not less than two, the inner side of the drying box is provided with a drying agent, and the adsorbing box comprises a frame body, and a sealing cover is fixed on the upper surface of the frame body through bolts.

[0023] By adopting the technical scheme, the residual gas can be heated, dried and adsorbed, and then enters the waste gas discharge pipeline system.

[0024] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0025] The dry ice recovery system, the dry ice production line tail gas is sent to the dry ice recovery compressor through the air inlet pipe for compression, the first electromagnetic valve in the exhaust structure is opened, the compressed raw material gas enters the first dry ice tail gas heat exchanger, the second electromagnetic valve in the first communication structure is opened, and after heat exchange and temperature rise, it enters the left tail gas drying bed, the working principle of the tail gas drying bed is consistent with that of the food-grade desulfurization bed and drying bed, and a cycle of adsorption operation is completed, the gas stream after the tail gas drying bed enters the second dry ice tail gas heat exchanger, then enters the dry ice tail gas liquefier through the fixed pipe, and then enters the dry ice tail gas rectification tower, through the dry ice tail gas rectification tower, the carbon dioxide meeting the national food-grade standard can be obtained, after the supercooler, it is sent to the food-grade carbon dioxide storage tank for storage, as raw material for subsequent dry ice manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic diagram of the utility model;

[0027] Figure 2 It is the structure schematic diagram of the utility model;

[0028] Figure 3 It is the structure schematic diagram of the utility model;

[0029] In the figure: 1, dry ice recovery compressor;2, air inlet pipe;3, support rod;4, first dry ice tail gas heat exchanger;5, exhaust structure;6, connecting mechanism;61, communication pipe;62, first communication structure;63, second communication structure;64, support table;65, tail gas drying bed;66, second dry ice tail gas heat exchanger;671, third communication structure;672, fourth communication structure;673, fixed tube;674, dry ice tail gas liquefier;675, dry ice tail gas rectification tower;676, fixed cylinder;677, drying and adsorbing structure. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the utility model.

[0031] Please refer to Figure 1 The dry ice recovery system in the embodiment comprises a dry ice recovery compressor 1, an air inlet pipe 2 is communicated with the left side of the dry ice recovery compressor 1, support rods 3 are arranged on the left and right sides of the upper surface of the dry ice recovery compressor 1, first dry ice tail gas heat exchangers 4 are arranged at the top ends of the left and right side support rods 3, an exhaust structure 5 is communicated with the air outlet end of the upper surface of the dry ice recovery compressor 1, the top end of the exhaust structure 5 is communicated with the air inlet end of the lower surface of the first dry ice tail gas heat exchanger 4, a connecting mechanism 6 is arranged on the right side of the first dry ice tail gas heat exchanger 4, and the connecting mechanism 6 improves the purity of dry ice recovery.

[0032] Please refer to Figures 2 to 3, in order to improve the purity of dry ice tail gas recovery, the connecting mechanism 6 includes a communication pipe 61, a first communication structure 62, a second communication structure 63, a support table 64, two tail gas drying beds 65, a second dry ice tail gas heat exchanger 66 and a connecting assembly, the left side of the communication pipe 61 is communicated with the gas outlet end of the first dry ice tail gas heat exchanger 4, the top ends of the first communication structure 62 and the second communication structure 63 are communicated with the lower surface of the communication pipe 61, the two tail gas drying beds 65 are arranged on the left and right sides of the upper surface of the support table 64, the first communication structure 62 and the second communication structure 63 are communicated with the gas inlet end of the upper surface of the left and right tail gas drying beds 65, and the second dry ice tail gas heat exchanger 66 is arranged on the front of the right tail gas drying bed 65.

[0033] In the embodiment, the connecting assembly includes a third communication structure 671, a fourth communication structure 672, a fixed pipe 673, a dry ice tail gas liquefier 674, a dry ice tail gas rectifying tower 675, a fixed cylinder 676 and a drying adsorption structure 677, the top end of the third communication structure 671 is communicated with the first gas inlet end of the lower surface of the second dry ice tail gas heat exchanger 66, the back of the third communication structure 671 is communicated with the gas outlet end of the front of the left tail gas drying bed 65, the top end of the fourth communication structure 672 is communicated with the second gas inlet end of the lower surface of the second dry ice tail gas heat exchanger 66, and the back of the fourth communication structure 672 is communicated with the gas outlet end of the front of the right tail gas drying bed 65.

[0034] In the embodiment, through the cooperation between the first communication structure 62, the second communication structure 63, the third communication structure 671 and the fourth communication structure 672, the left and right tail gas drying beds 65 can be operated alternately, and the production can be continuously carried out.

[0035] In the embodiment, the dry ice tail gas liquefier 674 is arranged on the left side of the dry ice tail gas rectifying tower 675, the left side of the fixed pipe 673 is communicated with the gas outlet end of the right side of the second dry ice tail gas heat exchanger 66, the right side of the fixed pipe 673 is communicated with the left gas inlet end of the dry ice tail gas liquefier 674, the output end of the dry ice tail gas liquefier 674 is communicated with the input end of the dry ice tail gas rectifying tower 675 through a pipeline, the fixed cylinder 676 is communicated with the gas outlet end at the top end of the dry ice tail gas rectifying tower 675, and the drying adsorption structure 677 is communicated with the top end of the fixed cylinder 676.

[0036] The exhaust structure 5 in the embodiment includes a first connecting pipe, the outside of the top end of the first connecting pipe is communicated with a first electromagnetic valve, the inside of the first electromagnetic valve is communicated with a second connecting pipe, the first connecting structure 62 includes a third connecting pipe, the outside of the top end of the third connecting pipe is communicated with a second electromagnetic valve, the inside of the second electromagnetic valve is communicated with a fourth connecting pipe, the second connecting structure 63 includes a fifth connecting pipe, the outside of the top end of the fifth connecting pipe is communicated with a third electromagnetic valve, the inside of the third electromagnetic valve is communicated with a sixth connecting pipe, the third connecting structure 671 includes a seventh connecting pipe, the outside of the top end of the seventh connecting pipe is communicated with a fourth electromagnetic valve, the inside of the fourth electromagnetic valve is communicated with an eighth connecting pipe.

[0037] In the embodiment, the dry ice production line tail gas is sent to the dry ice recovery compressor 1 through the gas inlet pipe 2 under the condition of normal pressure and below 40 DEG C, and is compressed to 2.4 MPa, then the first electromagnetic valve in the exhaust structure 5 is opened, and the compressed raw material gas enters the first dry ice tail gas heat exchanger 4, then the second electromagnetic valve in the first connecting structure 62 is opened, and the gas is heated and enters the left tail gas drying bed 65, the working principle of the tail gas drying bed 65 is consistent with that of the food-grade desulfurization bed and drying bed, and one adsorption operation cycle is completed, the left and right tail gas drying beds 65 can be operated alternately, so that the production can be continuously carried out, the gas stream after the tail gas drying bed 65 enters the second dry ice tail gas heat exchanger 66, then enters the dry ice tail gas liquefier 674 through the fixed pipe 673, and then enters the dry ice tail gas rectification tower 675.

[0038] In the embodiment, the fourth connecting structure 672 includes a ninth connecting pipe, the outside of the top end of the ninth connecting pipe is communicated with a fifth electromagnetic valve, the inside of the fifth electromagnetic valve is communicated with a tenth connecting pipe, a plurality of heating wires are arranged in the inside of the fixed cylinder 676, the drying and adsorption structure 677 includes a drying box, the upper surface of the drying box is communicated with a first output pipe, the top end of the first output pipe is communicated with an adsorption box, the upper surface of the adsorption box is communicated with a second output pipe, a plurality of filter cottons are arranged in the inside of the adsorption box, a drying agent is arranged in the inside of the drying box, and the adsorption box includes a frame body, and a sealing cover is fixed on the upper surface of the frame body by bolts.

[0039] It should be noted that the gas at the top of the dry ice tail gas rectification tower 675 is cooled and cooled by the low-temperature gas after throttling of the dry ice tail gas full condenser, and after the residual gas releases cold energy, the regenerated gas is heated in the inside of the fixed cylinder 676 and then enters the drying and adsorption structure 677 for drying and adsorption, and then carries impurities and enters the waste gas discharge pipeline system, the purity of the dry ice tail gas rectification tower 675 reaches 99.99%, reaching the national food-grade standard of carbon dioxide, after the supercooler, the carbon dioxide is sent to the food-grade carbon dioxide storage tank for storage, as the raw material for subsequent dry ice production.

[0040] The working principle of the above embodiment is as follows:

[0041] The dry ice production line tail gas is sent to the dry ice recovery compressor 1 through the gas inlet pipe 2 under the condition of normal pressure and below 40 DEG C, and is compressed to 2.4 MPa. Then, the first electromagnetic valve in the exhaust structure 5 is opened, and the compressed raw material gas enters the first dry ice tail gas heat exchanger 4. The second electromagnetic valve in the first communication structure 62 is opened, and the gas is heated by heat exchange and then enters the left tail gas drying bed 65. The working principle of the tail gas drying bed 65 is consistent with that of the food-grade desulfurization bed and drying bed. After one adsorption operation cycle, the left and right tail gas drying beds 65 can be operated alternately to ensure continuous production. The gas stream after the tail gas drying bed 65 enters the second dry ice tail gas heat exchanger 66, then enters the dry ice tail gas liquefier 674 through the fixed pipe 673, and then enters the dry ice tail gas rectification tower 675. The gas at the top of the dry ice tail gas rectification tower 675 is cooled by the low-temperature gas (residual gas) after throttling of the dry ice tail gas total condenser exhaust gas, and the residual gas releases cold energy and is heated in the fixed cylinder 676 to enter the drying and adsorption structure 677 for drying and adsorption. After carrying impurities, the gas enters the waste gas discharge pipeline system. The purity of the dry ice tail gas in the dry ice tail gas rectification tower 675 reaches 99.99%, which meets the national food-grade standard of carbon dioxide. After passing through the supercooler, the gas is sent to the food-grade carbon dioxide storage tank for storage as raw material for subsequent dry ice production.

Claims

1. A dry ice recovery system, comprising a dry ice recovery compressor (1), characterized in that: The dry ice recovery compressor (1) is connected to an air inlet pipe (2) on the left side. Support rods (3) are provided on both the left and right sides of the upper surface of the dry ice recovery compressor (1). A first dry ice exhaust gas heat exchanger (4) is provided at the top of the support rods (3) on the left and right sides. An exhaust structure (5) is connected to the air outlet end of the upper surface of the dry ice recovery compressor (1). The top of the exhaust structure (5) is connected to the air inlet end of the lower surface of the first dry ice exhaust gas heat exchanger (4). A connecting mechanism (6) is provided on the right side of the first dry ice exhaust gas heat exchanger (4). The connecting mechanism (6) includes a connecting pipe (61), a first connecting structure (62), a second connecting structure (63), a support platform (64), two exhaust gas drying beds (65), a second dry ice exhaust gas heat exchanger (66), and a connecting assembly. The left side of the connecting pipe (61) is connected to the outlet end of the first dry ice exhaust gas heat exchanger (4). The top ends of the first connecting structure (62) and the second connecting structure (63) are both connected to the lower surface of the connecting pipe (61). The two exhaust gas drying beds (65) are both located on the left and right sides of the upper surface of the support platform (64). The first connecting structure (62) and the second connecting structure (63) are both connected to the inlet ends of the upper surfaces of the left and right exhaust gas drying beds (65). The second dry ice exhaust gas heat exchanger (66) is located on the front of the right exhaust gas drying bed (65). The connecting assembly includes a third connecting structure (671), a fourth connecting structure (672), a fixed pipe (673), a dry ice tail gas liquefaction unit (674), a dry ice tail gas distillation column (675), a fixed cylinder (676), and a drying adsorption structure (677). The top of the third connecting structure (671) is connected to the first air inlet end on the lower surface of the second dry ice tail gas heat exchanger (66), and the back of the third connecting structure (671) is connected to the air outlet end on the front of the left tail gas drying bed (65). The fourth connecting structure... The top of (672) is connected to the second air inlet end of the lower surface of the second dry ice tail gas heat exchanger (66), the back of the fourth connecting structure (672) is connected to the air outlet end of the front of the right tail gas drying bed (65), the dry ice tail gas liquefaction unit (674) is located on the left side of the dry ice tail gas distillation tower (675), the left side of the fixed pipe (673) is connected to the air outlet end of the right side of the second dry ice tail gas heat exchanger (66), and the right side of the fixed pipe (673) is connected to the left air inlet end of the dry ice tail gas liquefaction unit (674).

2. The dry ice recovery system according to claim 1, characterized in that: The output end of the dry ice tail gas liquefaction unit (674) is connected to the input end of the dry ice tail gas distillation tower (675) through a pipe. The fixed cylinder (676) is connected to the top outlet of the dry ice tail gas distillation tower (675). The drying adsorption structure (677) is connected to the top of the fixed cylinder (676).

3. The dry ice recovery system according to claim 1, characterized in that: The exhaust structure (5) includes a first connecting pipe, the outer side of the top end of the first connecting pipe is connected to a first solenoid valve, and the inside of the first solenoid valve is connected to a second connecting pipe.

4. The dry ice recovery system according to claim 1, characterized in that: The first connecting structure (62) includes a third connecting pipe, the outer side of the top end of the third connecting pipe is connected to a second electromagnetic valve, and the inside of the second electromagnetic valve is connected to a fourth connecting pipe.

5. The dry ice recovery system according to claim 1, characterized in that: The second connecting structure (63) includes a fifth connecting pipe, the outer side of the top end of the fifth connecting pipe is connected to a third solenoid valve, and the inner side of the third solenoid valve is connected to a sixth connecting pipe.

6. The dry ice recovery system according to claim 1, characterized in that: The third connecting structure (671) includes a seventh connecting pipe, the outer side of the top end of the seventh connecting pipe is connected to a fourth solenoid valve, the inner side of the fourth solenoid valve is connected to an eighth connecting pipe, the fourth connecting structure (672) includes a ninth connecting pipe, the outer side of the top end of the ninth connecting pipe is connected to a fifth solenoid valve, and the inner side of the fifth solenoid valve is connected to a tenth connecting pipe.

7. The dry ice recovery system according to claim 1, characterized in that: The fixed cylinder (676) is provided with a number of no less than two heating wires inside.

8. The dry ice recovery system according to claim 1, characterized in that: The drying and adsorption structure (677) includes a drying chamber, the upper surface of which is connected to a first output pipe, the top end of which is connected to an adsorption chamber, the upper surface of which is connected to a second output pipe, the adsorption chamber is provided with at least two filter cottons inside, the drying chamber is provided with a desiccant inside, the adsorption chamber includes a frame, and the upper surface of the frame is fixed with a sealing cover by bolts.

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