CN216533581U

CN216533581U - Fresh-keeping system

Info

Publication number: CN216533581U
Application number: CN202123298080.8U
Authority: CN
Inventors: 周传刚; 彭程
Original assignee: Guangdong Lanjiu New Energy Technology Co ltd
Current assignee: Guangdong Lanjiu New Energy Technology Co ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-05-17
Anticipated expiration: 2031-12-27

Abstract

The utility model belongs to the technical field of food preservation, and particularly relates to a preservation system which comprises a hydrogen production machine, an oxygen removal machine, a condensation system and a buffer tank which are sequentially connected, wherein the oxygen removal machine is also connected with a fan, and the buffer tank is connected with a warehouse. Compared with the prior art, after methanol is reformed to produce hydrogen by a chemical mode, hydrogen in a hydrogen production machine and oxygen in the air are subjected to catalytic combustion, high-temperature gas after combustion is discharged into a warehouse after passing through a primary condensation system, a secondary condensation system and a buffer tank, and the gas entering the warehouse contains mixed gas of nitrogen, trace carbon dioxide, trace hydrogen and a small amount of water vapor.

Description

Fresh-keeping system

Technical Field

The utility model belongs to the technical field of food preservation, and particularly relates to a preservation system.

Background

The grain safety is not only an economic problem, but also closely related to national safety. At present, the main mode for guaranteeing the grain safety is grain storage, the grain storage is mainly carried out by a nitrogen adjusting method and other auxiliary means, the common nitrogen preparation method comprises a cryogenic air nitrogen preparation method and a nitrogen adsorption and desorption method, and the two methods have the following defects: high energy consumption, large noise, low system efficiency and large equipment volume.

In addition, the preservation period of most vegetables and fruits is only three to seven days generally, and the preservation of the vegetables and fruits is mainly realized by a freezing preservation mode at present, but the preservation time of the mode is not long enough and the transportation and storage requirements cannot be met.

In view of the above, the present invention aims to provide a fresh-keeping system, which produces hydrogen through a hydrogen production device, and then removes oxygen in the air through a chemical method with hydrogen to obtain nitrogen with low oxygen content, so as to greatly prolong the fresh-keeping time of grains and fruits, and the system has low noise, low energy consumption, safety and high efficiency, and the hydrogen itself has the effects of entering cells to lock water and resist oxidation, so that the weight can be preserved, and the hydrogen can also reduce the metabolism of grains, vegetables and fruits.

SUMMERY OF THE UTILITY MODEL

The utility model aims to: the fresh-keeping system is provided aiming at the defects of the prior art, hydrogen is produced by hydrogen production equipment, then oxygen in the air is removed by using hydrogen through a chemical method, and nitrogen with low oxygen content is obtained, so that the fresh-keeping time of grains and fruits can be greatly prolonged, the system has low noise, low energy consumption, safety and high efficiency, and hydrogen has the effects of entering cells to lock water and resist oxidation, so that the weight can be preserved, and the hydrogen can also reduce the metabolism of grains, vegetables and fruits.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the fresh-keeping system comprises a hydrogen production machine, an oxygen removal machine, a condensation system and a buffer tank which are connected in sequence, wherein the oxygen removal machine is also connected with a fan, and the buffer tank is connected with a warehouse.

As an improvement of the fresh-keeping system, the hydrogen production machine comprises a liquid storage system, a conveying system, a reforming reactor system and a gas buffer system which are sequentially connected, wherein the reforming reactor system comprises a gas production structure and a heat insulation structure arranged at the periphery of the gas production structure.

As an improvement of the preservation system, the conveying system comprises a conveying pipeline, and a filter, an electromagnetic valve and a one-way valve which are sequentially arranged on the conveying pipeline, one end of the conveying pipeline is connected with the liquid storage system, the other end of the conveying pipeline is connected with the reforming reactor system, the conveying pipeline is further connected with a gear pump, and the gear pump is located between the electromagnetic valve and the one-way valve.

As an improvement of the fresh-keeping system, the gas making structure comprises an outer tube and an inner tube arranged in the outer tube, a first heating body is arranged in the inner tube, a second heating body, a first reaction chamber, a second reaction chamber and a third reaction chamber are arranged between the outer tube and the inner tube, a liquid inlet of the first reaction chamber is connected with the conveying system, a gasification chamber is arranged at an inlet of the first reaction chamber, a gas outlet of the second reaction chamber is connected with the gas buffering system, the gas making structure is further provided with a heat exchange chamber, the third reaction chamber is communicated with the first reaction chamber and the second reaction chamber, and catalysts are arranged in the first reaction chamber, the second reaction chamber and the third reaction chamber.

As an improvement of the fresh-keeping system, the gasification chamber is provided with a first coil pipe structure; the heat exchange chamber is formed by high-temperature gas and low-temperature region, first reaction chamber the second reaction chamber with the below of third reaction chamber is provided with the support rack, support the rack with be formed with built on stilts space between the bottom of outer tube, the inlet of first reaction chamber with the gas outlet of second reaction chamber is located the same one side of system gas structure.

As an improvement of the fresh-keeping system, a first temperature measuring device is arranged in the inner pipe, and a second temperature measuring device is arranged in the third reaction chamber; one end parts of the inner pipe and the outer pipe are hermetically connected through a sealing structure, and the first temperature measuring device and the second temperature measuring device are fixed on the sealing structure through clamping sleeve heads; and the gas buffering system is provided with a pressure relief device.

The improvement of the preservation system of the utility model is characterized in that: the hydrogen production machine further comprises a control system; the control system comprises a control box, a display screen and an emergency stop button, the control box is connected with the display screen and the emergency stop button, and the control system is further connected with the liquid storage system, the conveying system, the reforming reactor system and the gas buffer system.

As an improvement of the preservation system, the condensation system comprises a primary condensation system and a secondary condensation system which are connected, the primary condensation system is connected with the deaerator, and the secondary condensation system is connected with the buffer tank.

As an improvement of the fresh-keeping system, a component detection structure is arranged between the buffer tank and the warehouse.

As an improvement of the fresh-keeping system, an air exhaust pipeline is connected between the warehouse and the fan; the inlet of the fan is connected with an electromagnetic valve.

Compared with the prior art, after methanol is reformed to produce hydrogen by a chemical mode, hydrogen in a hydrogen production machine and oxygen in the air are subjected to catalytic combustion, high-temperature gas after combustion is discharged into a warehouse through a primary condensing system, a secondary condensing system and a buffer tank, the gas entering the warehouse contains mixed gas of nitrogen, trace carbon dioxide, trace hydrogen and a small amount of water vapor, and the mixed gas basically contains no oxygen, so that the preservation time of grains and fruits can be greatly prolonged, and the hydrogen has the effects of entering cells to lock water and resist oxidation, so that the weight can be preserved, the metabolism of grains, vegetables and fruits can be reduced, and the preservation time of grains and fruits can be further prolonged.

Drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a schematic view of the hydrogen generator according to the present invention.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a schematic perspective view of the fixing frame (with a heating body) of the present invention.

Fig. 5 is an exploded view of the fixing frame of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in FIG. 1, the utility model provides a fresh-keeping system, which comprises a hydrogen production machine 10, a deaerator 20, a condensing system 30 and a buffer tank 40 which are connected in sequence, wherein the deaerator 20 is also connected with a fan 50, and the buffer tank 40 is connected with a warehouse 60. The condensing system 30 comprises a primary condensing system 70 and a secondary condensing system 80 which are connected, wherein the primary condensing system 70 is connected with the deaerator 20, and the secondary condensing system 80 is connected with the buffer tank 40. The temperature of the mixed gas from the oxygen remover 20 is 180-250 ℃, the temperature is reduced to 80-120 ℃ after the mixed gas is condensed by the primary condensing system 70, the temperature is reduced to 10-20 ℃ after the mixed gas is condensed by the secondary condensing system 80, nitrogen, trace carbon dioxide, trace hydrogen and a little water vapor are left after the mixed gas is condensed, the gas from the oxygen remover 20 has a certain temperature, and the grain storage needs to be carried out at a certain temperature and needs to be condensed.

A component detection structure 90 is also arranged between the buffer tank 40 and the warehouse 60, namely, after low-temperature gas passes through the buffer tank 40, high-purity low-temperature nitrogen enters the component detection structure 90 through a conveying pipe and then enters the warehouse 60, and the component detection structure 90 monitors the content, the temperature and the like of the gas components and regulates and controls each part of the system according to the content, the temperature and the like of the gas components; an air extraction pipeline 100 is connected between the warehouse 60 and the fan 50, and the air extraction pipeline 100 is used for connecting the warehouse 60 with the oxygen remover 20 and extracting the air to the oxygen remover 20 through the fan 50 to remove oxygen. An electromagnetic valve 110 is connected to the inlet of the fan 50 for controlling the air intake. According to the utility model, after methanol is reformed to prepare hydrogen by a chemical mode, hydrogen produced in the hydrogen preparation machine and oxygen in the air are subjected to catalytic combustion, high-temperature gas after combustion is discharged into the warehouse 60 through the primary condensation system 70, the secondary condensation system 80 and the buffer tank 40, the gas entering the warehouse 60 is a mixed gas containing nitrogen, trace carbon dioxide, trace hydrogen and a small amount of water vapor, and the mixed gas basically contains no oxygen, so that the preservation time of grains and fruits can be greatly prolonged, and the hydrogen has the effects of locking water and resisting oxidation when entering cells, so that the weight can be preserved, the metabolism of grains, vegetables and fruits can be reduced, and the preservation time of grains and fruits can be further prolonged.

The steps of using the system for fresh keeping are as follows:

firstly, converting methanol and water vapor into hydrogen and carbon dioxide by using a hydrogen production machine 10 to obtain hydrogen mixed gas;

secondly, introducing air into the oxygen remover 20, simultaneously introducing a hydrogen gas mixture into the oxygen remover 20, and combusting under the action of a catalyst to obtain a mixed gas containing water vapor, nitrogen, carbon dioxide and trace hydrogen;

and thirdly, condensing the mixed gas by a condensing system 30 to obtain low-temperature gas, and decelerating the low-temperature gas by a buffer tank 40 to enter the warehouse. The buffer tank 40 regulates the gas pressure after the secondary condensation, and prevents the pressure of the warehouse 60 from being fluctuated due to overlarge or fluctuation.

In the present invention, the deaerator 20, the condensing system 30, the buffer tank 40, the composition detecting structure 90, the fan 50, and the like all adopt corresponding structures in the prior art, and no special design is required, so the present invention is not described in detail.

As shown in fig. 2-5, the hydrogen production machine includes a liquid storage system 1, a conveying system 2, a reforming reactor system 3 and a gas buffer system 4, which are connected in sequence, and the reforming reactor system 3 includes a gas production structure 31 and a heat preservation structure 32 disposed at the periphery of the gas production structure 31. In the utility model, the reforming reactor system 3 is of a highly integrated type, and has the advantages of short cold start time, high heat utilization rate, high gas making efficiency and the like; the reforming reactor system 3 has a methanol conversion rate of 96% and a hydrogen selectivity of 95% in an optimal state.

The liquid storage system 1 comprises a liquid storage container 11 and a liquid level alarm 12 arranged on the liquid storage container 11. The liquid storage container 11 is made of plastic, so that the cost is low and the weight is light.

The conveying system 2 comprises a conveying pipeline 21, a filter 22, an electromagnetic valve 23 and a one-way valve 24, wherein the filter 22, the electromagnetic valve 23 and the one-way valve 24 are sequentially arranged on the conveying pipeline 21, one end of the conveying pipeline 21 is connected with the liquid storage system 1, the other end of the conveying pipeline 21 is connected with the reforming reactor system 3, the conveying pipeline 21 is further connected with a gear pump 25, and the gear pump 25 is located between the electromagnetic valve 23 and the one-way valve 24. The delivery system 2 can ensure accurate and clean delivery of the liquid into the gas making structure 31;

the gas making structure 31 comprises an outer tube 311 and an inner tube 312 arranged in the outer tube 311, a first heating body 313 is arranged in the inner tube 312, a second heating body 314, a first reaction chamber 315, a second reaction chamber 316 and a third reaction chamber 317 are arranged between the outer tube 311 and the inner tube 312, a liquid inlet of the first reaction chamber 315 is connected with the conveying system 2, and a gasification chamber 318 is arranged at an inlet of the first reaction chamber 315. The gas outlet of the second reaction chamber 316 is connected to the gas buffer system 4, the gas generating structure 31 is further provided with a heat exchange chamber 319, the third reaction chamber 317 is communicated with the first reaction chamber 315 and the second reaction chamber 316, and the first reaction chamber 315, the second reaction chamber 316 and the third reaction chamber 317 are all provided with a catalyst 320. When the device is used, methanol enters from a liquid inlet of the reaction chamber 315 and then enters the gasification chamber 318, the heat in the gasification chamber 318 heats the methanol to gasify the methanol, and then the methanol enters the catalyst 320 to complete a conversion reaction with the water vapor mixture under the action of the heating and the catalyst to generate hydrogen and carbon dioxide, and the hydrogen and the carbon dioxide are discharged from an outlet of the second reaction chamber 316. The gas making structure 31 of the present invention includes an inner tube 312 and an outer tube 311, and a first heating body 313 is placed in the inner tube 312, and a second heating body 314 is placed between the inner tube 312 and the outer tube 311, so that internal heating can be realized, thus not only realizing less heat loss, but also saving volume and improving efficiency. Namely, under the condition that the overall appearance structure of the tubular reactor is not changed, the utility model solves the problem of over short reaction path of the reactor by adding the internal sleeve structure, simultaneously increases the heat conduction quantity of the reactor due to the increase of the material of the inner ring, ensures that the temperature of a bed layer is more uniform, greatly shortens the cold start time of the reactor, improves the filling subarea state of the reactor, and simultaneously has simple welding of metals such as stainless steel and various alloys and convenient catalyst loading and unloading.

The gasification chamber 318 is configured as a first coil structure; the heat exchange chamber is formed by a high temperature gas and a low temperature region 319 (the low temperature region 319 is a region of about the upper third of the second reaction chamber 316 and the third reaction chamber 317 near the periphery), a support rack 322 is arranged below the first reaction chamber 315, the second reaction chamber 316 and the third reaction chamber 317, an overhead space is formed between the support rack 322 and the bottom of the outer tube 311, a liquid inlet of the first reaction chamber 315 and a gas outlet of the second reaction chamber 316 are positioned on the same side of the gas making structure 31, and in the utility model, a liquid inlet of the first reaction chamber 315 and a gas outlet of the second reaction chamber 316 are positioned on the same side of the gas making structure 21. The volume of the entire reactor can be reduced and clogging can be avoided. Namely, the reactor of the utility model is provided with liquid inlet and gas outlet at the same end, and the raw material input end and the product output end of the reactor can be exchanged and adjusted according to the reaction condition.

According to the utility model, the coil pipe structure with a certain length is arranged at the inlet of the first reaction chamber 315, and the conveying system 2 is communicated with the coil pipe structure, so that the heat of the gas making structure 31 can be fully utilized to gasify the methanol liquid, less heat loss is realized, and the utilization rate of heat energy is improved; in practice, a length of tubing is used, and the tubing is wound in a cylindrical coil that is required to conform to the inner wall of the inlet of the first reaction chamber 315. The vaporizing chamber 318 made of the coil structure can contact the heat supply body in a short distance, so that the heat supply body and the cold liquid can achieve the heat exchange effect, thereby fully utilizing the heat and achieving high heat conversion rate. The present invention can save the volume because the inner space of the gas making structure 31 is reasonably used and the additional gasification chamber 318 is not needed. And the gasification chamber is simple to assemble and low in preparation cost.

The heat exchange chamber improves the temperature of the low-temperature area of the gas making structure and improves the heat utilization rate.

A first temperature measuring device 323 is arranged in the inner pipe 312, and a second temperature measuring device 324 is arranged in the third reaction chamber 317; one end parts of the inner pipe 312 and the outer pipe 311 are hermetically connected through a sealing structure 325, and the first temperature measuring device 323 and the second temperature measuring device 324 are both fixed on the sealing structure 325 through a clamping sleeve head 326. The first temperature measuring device 323 and the second temperature measuring device 324 can measure the real-time temperature inside the inner pipe 312 and the outer pipe 311.

The second heating element 314 is arranged between the inner tube 312 and the outer tube 311 through a fixing frame 5, the fixing frame 5 comprises a vertical column 51, and a heating element support plate 52, a heating element fixing plate 53 and a heating element support fixing plate 54 which are sequentially arranged on the vertical column 51 in a penetrating manner, a first hole 55 through which the second heating element 314 can pass is arranged on the heating element fixing plate 53, and a second hole 56 through which the second heating element 314 can pass is arranged on the heating element support fixing plate 54.

That is, the heating body support plate 52 supports the bottom of the second heating body 314, the heating body fixing plate 53 supports the horizontal line position of the second heating body 314, the heating body support fixing plate 54 supports the fixing frame, the upright 51 is connected in series with three plates to form an integral support, wherein one end of the upright 51 is penetrated and fixed on the heating body support plate 52, the other end is penetrated and fixed on the heating body support fixing plate 54, and the heating body fixing plate 53 is penetrated and fixed between the two ends of the upright 51. Preferably, the heating body supporting plate 52, the heating body fixing plate 53 and the heating body supporter fixing plate 54 are arranged in parallel.

The heating body supporting plate 52, the heating body fixing plate 53 and the heating body support fixing plate 54 are all in a semicircular strip structure. When the fixing structure is used, the two fixing structures are oppositely arranged, namely, an annular fixing structure is formed. In practical use, the second heating body 314 is sequentially inserted into the second hole 56 and the first hole 55 and then pressed against the heating body support plate 52 to be fixed, and then the two fixing frames 5 with the second heating body 314 are oppositely placed in the space defined by the inner tube 312 and the outer tube 311. The semicircular structure is used as a fixing structure of the annular heating body, and the using environment is the inside of the annular pipeline; the arc-shaped, especially semicircular, design has the advantage that the machining precision does not need to be too high, thereby greatly reducing the production cost; the structure is easy to install, can avoid the concentricity requirement of the inner wall and the outer wall of the ring, has strong interchangeability and ensures the quality of batch installation.

The outer edge of the heating body support fixing plate 54 is provided with a protrusion 57 to facilitate the contact of the heating body support fixing plate 54 with the outer tube 311, so that the outer tube edge 311 plays a supporting role for the heating body support fixing plate 54. The upright 51 is provided with several. In this embodiment, four columns 51 are provided, wherein one column is provided at each of the two ends of the integral fixing frame, and two columns are provided at the middle of the integral fixing frame.

The heating body support plate 52, heating body fixing plate 53 and heating body support fixing plate 54 are all welded to the column 51, and the operation is simple and easy to implement.

The first holes 55 are provided in a plurality and uniformly arranged on the heating body fixing plate 52. The second holes 56 are provided in a plurality and uniformly arranged on the heating body supporter fixing plate 53. The first holes 55 and the second holes 56 are disposed in a one-to-one correspondence, and have substantially the same shape and size, so that the second heating body 314 can pass through the holes smoothly. The number of holes may be set according to the number of the second heating bodies 314.

The gas buffer system 4 is provided with a pressure relief device 41. The gas buffer system is a conventional buffer system, is formed by processing stainless steel plates, and has the functions of cooling, buffering, purifying and stabilizing high-temperature gas.

The hydrogen generator also includes a control system 5. The control system 5 comprises a control box 51, a display screen 52 and an emergency stop button 53, the control box 51 is connected with the display screen 52 and the emergency stop button 53, and the control system 5 is further connected with the liquid storage system 1, the conveying system 2, the reforming reactor system 3 and the gas buffer system 4. The control box 51 detects, regulates and controls the cooperative work of all the systems of the whole machine; the display screen 52 controls the methanol inlet flow during hydrogen production through screen operation, and checks and timely adjusts other system parameters. The temperatures detected by the first temperature measuring device 323 and the second temperature measuring device 324 can be fed back to the control system 5 in real time, and the control system 5 can control the heating temperatures of the first heating body 313 and the second heating body 314 as required, thereby controlling the temperatures in the inner tube 311 and the outer tube 312. The control system 5 is connected with the gear pump 25 to control the liquid inlet amount of the methanol, and the control system can be adjusted according to the requirement.

Together, the level alarm 12, the pressure relief device 41 and the emergency stop button 53 form a physical explosion-proof safety system to ensure the safety of the use of the apparatus.

In a word, the utility model simplifies the methanol steam reforming hydrogen production system, integrally designs the gasification system and the reforming system, reduces the equipment volume, improves the heat utilization rate of the system, ensures the catalytic reaction condition by reasonable layout design and processing technology, improves the hydrogen production rate and saves the cost.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The fresh-keeping system is characterized by comprising a hydrogen production machine, an oxygen removal machine, a condensation system and a buffer tank which are sequentially connected, wherein the oxygen removal machine is further connected with a fan, and the buffer tank is connected with a warehouse.

2. The freshness preservation system of claim 1, wherein: the hydrogen production machine comprises a liquid storage system, a conveying system, a reforming reactor system and a gas buffer system which are sequentially connected, wherein the reforming reactor system comprises a gas production structure and a heat insulation structure arranged on the periphery of the gas production structure.

3. The freshness preservation system of claim 2, wherein: conveying system include pipeline and set gradually in last filter, solenoid valve and the check valve of pipeline, pipeline's one end with stock solution headtotail, pipeline's the other end with reforming reactor headtotail, pipeline still is connected with the gear pump, the gear pump is located the solenoid valve with between the check valve.

4. The freshness preservation system of claim 2, wherein: the gas making structure includes the outer tube and set up in inner tube in the outer tube, be provided with first heating member in the inner tube, the outer tube with be provided with second heating member, first reaction chamber, second reaction chamber and third reaction chamber between the inner tube, the inlet of first reaction chamber with conveying system connects, the entrance of first reaction chamber is provided with the vaporizer, the gas outlet of second reaction chamber with gas buffer system connects, the gas making structure still is provided with the heat exchange chamber, the third reaction chamber with first reaction chamber with second reaction chamber intercommunication, first reaction chamber the second reaction chamber with all be provided with the catalyst in the third reaction chamber.

5. The freshness preservation system of claim 4, wherein: the gasification chamber is arranged into a first coil pipe structure; the heat exchange chamber is formed by high-temperature gas and low-temperature region, first reaction chamber the second reaction chamber with the below of third reaction chamber is provided with the support rack, support the rack with be formed with built on stilts space between the bottom of outer tube, the inlet of first reaction chamber with the gas outlet of second reaction chamber is located the same one side of system gas structure.

6. The freshness preservation system of claim 4, wherein: a first temperature measuring device is arranged in the inner pipe, and a second temperature measuring device is arranged in the third reaction chamber; one end parts of the inner pipe and the outer pipe are hermetically connected through a sealing structure, and the first temperature measuring device and the second temperature measuring device are fixed on the sealing structure through clamping sleeve heads; and the gas buffering system is provided with a pressure relief device.

7. The freshness preservation system of claim 2, wherein: the hydrogen production machine further comprises a control system; the control system comprises a control box, a display screen and an emergency stop button, the control box is connected with the display screen and the emergency stop button, and the control system is further connected with the liquid storage system, the conveying system, the reforming reactor system and the gas buffer system.

8. The freshness preservation system of claim 1, wherein: the condensing system includes the one-level condensing system and the second grade condensing system that are connected, the one-level condensing system with the deoxidization machine is connected, the second grade condensing system with the buffer tank is connected.

9. The freshness preservation system of claim 1, wherein: and a component detection structure is also arranged between the buffer tank and the warehouse.

10. The freshness preservation system of claim 1, wherein: an air exhaust pipeline is connected between the warehouse and the fan; the inlet of the fan is connected with an electromagnetic valve.