Liquid nitrogen purification device

Abstract

The utility model provides a liquid nitrogen purification device, which comprises a purification box, a liquid inlet pipe, a liquid outlet pipe, a valve, an adsorbent and a replacement regeneration mechanism, the adsorbent comprises a metal frame, a lithium molecular sieve and a screen, the replacement regeneration mechanism comprises a treatment box, a rotating motor, a rotating plate and a push-pull mechanism, liquid nitrogen can enter the purification box, and the liquid nitrogen can enter the purification box. When the adsorbent in the purification box is saturated in adsorption, an electric sealing door can be opened, the adsorbent in the purification box is pulled out to a rotating plate through a push-pull mechanism, and then a rotating motor drives the rotating plate to rotate, so that the position of the adsorbent on the rotating plate is changed; and finally, the push-pull mechanism can push the adsorbent with good adsorption capacity into the purification box, so that purification work can be continued, the pause time of the purification work is shortened, the liquid nitrogen purification efficiency is improved, and in addition, the adsorbent with saturated adsorption can be treated in the treatment box so as to be conveniently replaced next time.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen production and processing, and particularly relates to a liquid nitrogen purification device. Background Art

[0002] Nitrogen is a gas with very stable chemical properties. Under normal temperature conditions, it basically does not react with other substances. Nitrogen can be liquefied into liquid nitrogen under low temperature conditions. Liquid nitrogen has a wide range of application scenarios. In food preservation, it can achieve quick-freezing preservation. In the medical industry, it can kill diseased area cells in an extremely frozen state. In the industrial field, liquid nitrogen can be used as a deep refrigerant or for making nitrogen fertilizers, etc. Since air accounts for about 70%, the production source of liquid nitrogen is basically air. After removing impurities from the air and cooling it, according to the different boiling points of nitrogen, oxygen, and argon in the air, separation is carried out by the fractionation principle using a rectification column. Among them, nitrogen will evaporate first and be collected. The initially collected liquid nitrogen may still contain a small amount of impurities such as oxygen and argon. Therefore, it is necessary to purify the liquid nitrogen. The purification of liquid nitrogen includes further rectification and the adsorption method. Further rectification requires multiple rectifications and takes a long time. The adsorption method can adsorb oxygen, argon, etc., thereby improving the purity of liquid nitrogen. Currently, when using the adsorption method for purification, after the adsorbent is saturated with adsorption, it cannot be quickly replaced, and the purification process needs to be interrupted, resulting in the interruption of the liquid nitrogen purification process. At the same time, the decline in adsorption capacity will cause other impurities to still exist in the liquid nitrogen, affecting the quality of liquid nitrogen. Summary of the Utility Model

[0003] In view of this, the utility model provides a liquid nitrogen purification device, which can quickly replace the adsorbent to ensure the continuous progress of the liquid nitrogen purification process.

[0004] The technical solution of the utility model is realized as follows:

[0005] A liquid nitrogen purification device includes a purification tank, a liquid inlet pipe, a liquid outlet pipe, a valve, an adsorbent, and a replacement and regeneration mechanism. The liquid inlet pipe is arranged on one side of the purification tank, the liquid outlet pipe is arranged on the bottom surface of the purification tank, and the valve is arranged on the liquid outlet pipe. The replacement and regeneration mechanism includes a treatment tank, a rotary motor, a rotating plate, and a pushing and pulling mechanism. One side of the treatment tank is open, and its open side is arranged on one side of the purification tank. An electric sealing door is arranged on the side wall of the purification tank. The rotary motor is arranged on the inner bottom surface of the treatment tank, and its output shaft is connected to the bottom surface of the rotating plate. The adsorbent includes a metal frame, lithium molecular sieve, and a screen. The metal frame is slidably arranged on the top surface of the rotating plate and inside the purification tank. The electric sealing door is located between the metal frames. The screen is arranged on the bottom surface of the metal frame, and the lithium molecular sieve is located above the screen. The pushing and pulling mechanism is used to push and pull the metal frame.

[0006] Preferably, it further includes a bearing strip, the bearing strips are oppositely arranged on the inner wall of the purification box, and the bottom surface of the metal frame abuts against the top surface of the bearing strip.

[0007] Preferably, the pushing and pulling mechanism includes an electric push rod and an electromagnet. The electric push rods are oppositely arranged on the top surface of the rotating plate, and its output shaft is connected to the electromagnet. The metal frame is located on the moving path of the electromagnet.

[0008] Preferably, the liquid inlet pipe includes a raw material pipe, a three-way valve, a horizontal pipe, a circulation pipe and a pump body. The top ends of the raw material pipe and the circulation pipe are respectively connected to the two inlets of the three-way valve. The outlet of the three-way valve is connected to one end of the horizontal pipe. The other end of the horizontal pipe is connected to the purification box. The bottom end of the circulation pipe is connected to the bottom of the side wall of the purification box. The pump body is arranged on the circulation pipe.

[0009] Preferably, the replacement and regeneration mechanism further includes a vacuum pump and a heating rod. The vacuum pump is arranged on the outer wall of the treatment box, and the heating rod is arranged on the inner wall of the treatment box.

[0010] Preferably, the replacement and regeneration mechanism further includes an air outlet pipe and a control valve. The air outlet pipe is arranged on the outer wall of the treatment box, and the control valve is arranged on the air outlet pipe.

[0011] Compared with the prior art, the beneficial effects of the present utility model are:

[0012] ① Liquid nitrogen enters the purification box through the liquid inlet pipe and flows through the adsorbent. The adsorbent can adsorb oxygen and argon in the liquid nitrogen to achieve the purification of liquid nitrogen. The purified liquid nitrogen can be discharged through the liquid outlet pipe, eliminating the need for multiple rectification and separation processes and improving the purification efficiency of liquid nitrogen;

[0013] ② A replacement and regeneration mechanism is provided on one side of the purification box. The rotating plate is provided with an adsorbent with normal adsorption capacity. When the adsorbent in the purification box is saturated with adsorption, after opening the sealed box, the adsorbent in the purification box can be pulled out through the pushing and pulling mechanism, and under the drive of the rotating motor, the position of the adsorbent can be replaced, and then the pushing and pulling mechanism can push the adsorbent with normal adsorption capacity into the purification box to ensure the continuous progress of the liquid nitrogen purification process;

[0014] ③ The adsorbent saturated with adsorption can be regenerated after entering the treatment box to wait for the next replacement process. The regeneration and purification processes can be carried out simultaneously to facilitate the timely replacement of the adsorbent saturated with adsorption and improve the liquid nitrogen purification efficiency. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only the preferred embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 Structural schematic diagram of a liquid nitrogen purification device of the present utility model;

[0017] Figure 2 Structural schematic diagram of an adsorbent of a liquid nitrogen purification device of the present utility model;

[0018] Figure 3 Side view structural schematic diagram of an adsorbent and a purification tank of a liquid nitrogen purification device of the present utility model;

[0019] In the figure, 1, purification tank; 2, liquid outlet pipe; 3, valve; 4, adsorbent; 5, treatment tank; 6, rotary motor; 7, rotating plate; 8, electric sealing door; 9, metal frame; 10, lithium molecular sieve; 11, screen; 12, bearing bar; 13, electric push rod; 14, electromagnet; 15, raw material pipe; 16, three-way valve; 17, horizontal pipe; 18, circulation pipe; 19, pump body; 20, vacuum pump; 21, heating rod; 22, gas outlet pipe; 23, control valve. Detailed implementation manners

[0020] To better understand the technical content of the present utility model, a specific embodiment is provided below, and the present utility model will be further described in conjunction with the drawings.

[0021] See Figures 1 to 3 , a liquid nitrogen purification device provided by the present utility model includes a purification tank 1, a liquid inlet pipe, a liquid outlet pipe 2, a valve 3, an adsorbent 4, and a replacement and regeneration mechanism. The liquid inlet pipe is arranged on one side of the purification tank 1, the liquid outlet pipe 2 is arranged on the bottom surface of the purification tank 1, and the valve 3 is arranged on the liquid outlet pipe 2; the replacement and regeneration mechanism includes a treatment tank 5, a rotary motor 6, a rotating plate 7, and a pushing and pulling mechanism. One side of the treatment tank 5 is open, and the open side is arranged on one side of the purification tank 1. An electric sealing door 8 is arranged on the side wall of the purification tank 1. The rotary motor 6 is arranged on the inner bottom surface of the treatment tank 5, and its output shaft is connected to the bottom surface of the rotating plate 7. The adsorbent 4 includes a metal frame 9, a lithium molecular sieve 10, and a screen 11. The metal frame 9 is slidably arranged on the top surface of the rotating plate 7 and inside the purification tank 1. The electric sealing door 8 is located between the metal frames 9. The screen 11 is arranged on the bottom surface of the metal frame 9, and the lithium molecular sieve 10 is located above the screen 11. The pushing and pulling mechanism is used to push and pull the metal frame 9.

[0022] A liquid nitrogen purification device of the utility model is used for purifying the preliminarily collected liquid nitrogen. The raw material liquid nitrogen is conveyed into the purification box 1 through the liquid inlet pipe. The liquid nitrogen will flow through the adsorbent 4 in the purification box 1. The lithium molecular sieve 10 in the adsorbent 4 can adsorb oxygen and argon in the liquid nitrogen. Then the liquid nitrogen can pass through the screen 11 and enter the bottom of the purification box 1. After the adsorption is completed, the valve 3 can be opened so that the adsorbed and purified liquid nitrogen can be discharged to the outside through the liquid outlet pipe 2, realizing the purification process of liquid nitrogen.

[0023] During the continuous purification process, the lithium molecular sieve 10 in the purification box 1 will be saturated with adsorption. At this time, the entire adsorbent 4 needs to be replaced. A treatment box 5 is arranged on one side of the purification box 1. The open side of the treatment box 5 is closely attached to the side of the purification box 1 where the electric sealing door 8 is arranged. The adsorbent 4 is located on the side of the electric sealing door 8. After the electric sealing door 8 is opened, the pushing and pulling mechanism can pull out the adsorbent 4 in the purification box 1 into the treatment box 5 and move it onto the rotating plate 7. At this time, the two adsorbents 4 on the rotating plate 7 are arranged oppositely. Then the rotating motor 6 is started. The rotating motor 6 will drive the rotating plate 7 to slowly rotate, so that the adsorbent 4 with normal adsorption capacity placed on it rotates to the side of the electric sealing door 8. Finally, the adsorbent 4 with normal adsorption capacity is pushed into the purification box 1 through the pushing and pulling mechanism, reducing the suspension time of the purification work and improving the efficiency of liquid nitrogen purification.

[0024] After the adsorbent 4 enters the purification box 1, the electric sealing door 8 seals the purification box 1, and the treatment box 5 can regenerate the adsorbent 4 saturated with adsorption, so that oxygen, argon and impurities on the lithium molecular sieve 10 are desorbed, restoring the adsorption capacity of the adsorbent 4 for the convenience of replacing the adsorbent 4 again.

[0025] Preferably, it further includes a bearing strip 12. The bearing strips 12 are oppositely arranged on the inner wall of the purification box 1, and the bottom surface of the metal frame 9 abuts against the top surface of the bearing strip 12.

[0026] The arranged bearing strip 12 is used to bear the metal frame 9, ensuring that the adsorbent 4 can be stably located in the purification box 1. At the same time, when replacing the adsorbent 4, the metal frame 9 can move along the top surface of the bearing strip 12 to realize the pulling out or pushing in of the adsorbent 4.

[0027] Preferably, the pushing and pulling mechanism includes an electric push rod 13 and an electromagnet 14. The electric push rods 13 are oppositely arranged on the top surface of the rotating plate 7, and its output shaft is connected to the electromagnet 14. The metal frame 9 is located on the moving path of the electromagnet 14.

[0028] The main structure of the adsorbent 4 is a metal frame 9, at the bottom of which a screen 11 is arranged, through which liquid can flow, and the lithium molecular sieve 10 arranged on the top of the screen 11 can adsorb oxygen and argon in the liquid nitrogen flowing through. When the lithium molecular sieve 10 is saturated with adsorption, the electric sealing door 8 can be opened, and the electric push rod 13 can drive the electromagnet 14 to move into the purification box 1 and contact with the metal frame 9 to achieve magnetic attraction of the metal frame 9, and then the adsorbent 4 can be pulled out to the rotating plate 7. At the same time, when the adsorbent 4 with good adsorption capacity on the rotating plate 7 is pushed into the purification box 1, the electromagnet 14 can push the metal frame 9 to move and ensure that no deviation occurs during the movement.

[0029] Preferably, the liquid inlet pipe includes a raw material pipe 15, a three-way valve 16, a horizontal pipe 17, a circulation pipe 18 and a pump body 19, the top of the raw material pipe 15 and the circulation pipe 18 are respectively connected to the two inlets of the three-way valve 16, the outlet of the three-way valve 16 is connected to one end of the horizontal pipe 17, the other end of the horizontal pipe 17 is connected to the purification box 1, the bottom end of the circulation pipe 18 is connected to the bottom of the side wall of the purification box 1, and the pump body 19 is arranged on the circulation pipe 18.

[0030] The liquid inlet of the purification box 1 is divided into two directions. When the three-way valve 16 connects the raw material pipe 15 and the horizontal pipe 17, the external liquid nitrogen can enter the purification box 1 through the raw material pipe 15 and the horizontal pipe 17. When the three-way valve 16 connects the horizontal pipe 17 and the circulation pipe 18, the pump body 19 can re-pump the liquid nitrogen adsorbed on the bottom of the purification box 1 to the top, thereby realizing multiple adsorption of liquid nitrogen and reducing impurities in the liquid nitrogen as much as possible.

[0031] Preferably, the replacement and regeneration mechanism also includes a pressure reducing pump 20 and a heating rod 21, the pressure reducing pump 20 is arranged on the outer wall of the processing box 5, and the heating rod 21 is arranged on the inner wall of the processing box 5. The replacement and regeneration mechanism also includes an air outlet pipe 22 and a control valve 23, the air outlet pipe 22 is arranged on the outer wall of the processing box 5, and the control valve 23 is arranged on the air outlet pipe 22.

[0032] When the adsorbent 4 saturated with adsorption is transferred to the rotating plate 7 and the electric sealing door 8 is closed, the pressure reducing pump 20 and the heating rod 21 can be turned on to desorb the oxygen, argon and impurities adsorbed on the lithium molecular sieve 10 in a low-pressure and high-temperature environment. When the control valve 23 is opened, the gas in the processing box 5 can be transported to the outside to discharge impurities and realize the adsorption capacity of the lithium molecular sieve 10.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid nitrogen purification device, characterized in that: It includes a purification box, a liquid inlet pipe, a liquid outlet pipe, a valve, an adsorbent and a replacement and regeneration mechanism, wherein the liquid inlet pipe is arranged at one side of the purification box, the liquid outlet pipe is arranged at the bottom surface of the purification box, and the valve is arranged on the liquid outlet pipe; the replacement and regeneration mechanism includes a processing box, a rotating motor, a rotating plate and a push-pull mechanism, one side of the processing box is open, and its open side is arranged at one side of the purification box, the side wall of the purification box is provided with an electric sealing door, the rotating motor is arranged at the bottom surface of the processing box, and its output shaft is connected to the bottom surface of the rotating plate, the adsorbent includes a metal frame, a lithium molecular sieve and a screen, the metal frame is slidably arranged on the top surface of the rotating plate and inside the purification box, the electric sealing door is located between the metal frames, the screen is arranged at the bottom surface of the metal frame, the lithium molecular sieve is located above the screen, and the push-pull mechanism is used to push and pull the metal frame.

2. A liquid nitrogen purification device according to claim 1, characterized in that: It also includes a bearing bar, which is arranged relatively to the inner wall of the purification box, and the bottom surface of the metal frame abuts against the top surface of the bearing bar.

3. A liquid nitrogen purification device according to claim 1, characterized in that: The push-pull mechanism comprises an electric push rod and an electromagnet. The electric push rod is relatively arranged on the top surface of the rotating plate, and its output shaft is connected to the electromagnet. The metal frame is located on the moving path of the electromagnet.

4. A liquid nitrogen purification device according to claim 1, characterized in that: The liquid inlet pipe includes a raw material pipe, a three-way valve, a horizontal pipe, a circulation pipe and a pump body. The top ends of the raw material pipe and the circulation pipe are respectively connected to the two inlets of the three-way valve, the outlet of the three-way valve is connected to one end of the horizontal pipe, the other end of the horizontal pipe is connected to the purification box, the bottom end of the circulation pipe is connected to the bottom of the side wall of the purification box, and the pump body is arranged on the circulation pipe.

5. The liquid nitrogen purification device according to claim 1, characterized in that: The replacement and regeneration mechanism also includes a pressure reducing pump and a heating rod. The pressure reducing pump is arranged on the outer wall of the processing box, and the heating rod is arranged on the inner wall of the processing box.

6. A liquid nitrogen purification device according to claim 1, characterized in that: The replacement and regeneration mechanism also includes an air outlet pipe and a control valve. The air outlet pipe is arranged on the outer wall of the processing box, and the control valve is arranged on the air outlet pipe.

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