WO2022199072A1

WO2022199072A1 - Liquid carbon dioxide production device and system

Info

Publication number: WO2022199072A1
Application number: PCT/CN2021/131584
Authority: WO
Inventors: 李大海
Original assignee: 惠州凯美特气体有限公司
Priority date: 2021-03-24
Filing date: 2021-11-18
Publication date: 2022-09-29
Also published as: CN215113521U

Abstract

A liquid carbon dioxide production device and system. The liquid carbon dioxide production device comprises a gas separation apparatus and a liquefaction purification apparatus, wherein the gas separation apparatus comprises a compression mechanism, a dehydrogenation mechanism, a purification mechanism and an oxygen supply mechanism; the liquefaction purification apparatus comprises a liquefaction purification mechanism, a liquid ammonia refrigeration mechanism, a storage tank, a first switch valve and a circulation switch valve; and an output end of the purification mechanism is connected to an input end of the liquefaction purification mechanism by means of the first switch valve, the liquefaction purification mechanism is connected to the liquid ammonia refrigeration mechanism by means of the circulation switch valve, and the first switch valve and the circulation switch valve are both used for being closed after a central control device sends out a parking signal. After a central control device sends out a parking signal, a first switch valve isolates a purification mechanism from a liquefaction purification mechanism, thereby reducing the probability of leakage of liquid carbon dioxide; and a circulation switch valve blocks a refrigeration circulation path, thereby reducing the probability of leakage of liquid ammonia, such that the timeliness and the safety of emergency processing in an emergent abnormal situation are improved.

Description

Liquid carbon dioxide production equipment and system

technical field

The present invention relates to a liquid carbon dioxide production equipment and system.

Background technique

Liquid carbon dioxide belongs to hazardous chemicals, and the category of hazardous substances is 2-2, which belongs to compressed gas and liquefied gas. Liquid carbon dioxide production enterprises belong to hazardous chemical production enterprises, and because liquid ammonia is used as a refrigerator in the device, liquid ammonia is a It is a dangerous chemical under the national key supervision, so the liquid carbon dioxide production enterprises belong to the two key enterprises and one major enterprise under the key supervision of the state, and the safety management requirements are relatively high. With the advancement of the state's three-year action rectification plan for hazardous chemical production enterprises, more and more attention has been paid to the safety production management of carbon dioxide production enterprises.

However, in the case of a major dangerous and safety emergency (for example, leakage of liquid carbon dioxide or liquid ammonia), the handling is not timely or the personnel need to go deep into the dangerous site for parking and disposal, there is a problem of insufficient operator level or experience, which is likely to cause improper handling. , causing more safety production accidents.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a liquid carbon dioxide production equipment and system with high timeliness and safety for emergency treatment in emergency and abnormal situations.

A liquid carbon dioxide production equipment, including a gas separation device and a liquefaction purification device; the gas separation device includes a compression mechanism, a dehydrocarbon mechanism, a purification mechanism and an oxygen supply mechanism, and the output end of the oxygen supply mechanism is connected with the compression mechanism. The input end is connected to the input end, the input end of the compression mechanism is also used to connect with the feed gas supply device, the output end of the compression mechanism is connected to the input end of the dehydrocarbon mechanism, and the output end of the dehydrocarbon mechanism is connected to the The input end of the purification mechanism is connected; the liquefaction and purification device includes a liquefaction purification mechanism, a liquid ammonia refrigeration mechanism, a storage tank, a first switch valve and a circulation switch valve, and the output end of the purification mechanism is connected to the other through the first switch valve. The input end of the liquefaction and purification mechanism is connected, and the output end of the liquefaction and purification mechanism is connected to the storage tank, and the storage tank is used to store the liquid carbon dioxide in the liquefaction and purification mechanism, and the liquefaction and purification mechanism passes through the circulation The switch valve is connected with the liquid ammonia refrigeration mechanism, and the circulation switch valve is used to circulate the liquid ammonia refrigeration liquid between the liquefaction purification mechanism and the liquid ammonia refrigeration mechanism, wherein the first switch valve and the The above cycle on-off valves are all used to close after the central control device sends a stop signal.

A liquid carbon dioxide production system, comprising the above-mentioned liquid carbon dioxide production equipment.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the present invention will become apparent from the description, drawings and claims.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, the drawings of other embodiments can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of an apparatus for producing liquid carbon dioxide in one embodiment.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 , which is a schematic diagram of a liquid carbon dioxide production apparatus according to an embodiment of the present invention.

The liquid carbon dioxide production equipment 10 of an embodiment includes a gas separation device 100 and a liquefaction purification device 200 . The gas separation device 100 includes a compression mechanism 110 , a hydrocarbon removal mechanism 120 , a purification mechanism 130 and an oxygen supply mechanism 140 . The output end of the oxygen supply mechanism 140 is connected to the input end of the compression mechanism 110 . The input end of the compression mechanism 110 is also used for connecting with the feed gas supply device, and the output end of the compression mechanism 110 is connected with the input end of the dehydrocarbon mechanism 120 . The output end of the dehydrocarbonation mechanism 120 is connected with the input end of the purification mechanism 130 . The liquefaction and purification device 200 includes a liquefaction and purification mechanism 210 , a liquid ammonia refrigeration mechanism 220 , a storage tank 230 , a first on-off valve 240 and a circulation on-off valve 250 . The output end of the purification mechanism 130 is connected to the input end of the liquefaction purification mechanism 210 through the first switch valve 240 . The output end of the liquefaction and purification mechanism 210 is connected to the storage tank 230 . The storage tank 230 is used for storing the liquid carbon dioxide in the liquefaction and purification mechanism 210 . The liquefaction and purification mechanism 210 is connected to the liquid ammonia refrigeration mechanism 220 through the circulation switch valve 250 . The circulation switch valve 250 is used for circulating the liquid ammonia refrigerant between the liquefaction and purification mechanism 210 and the liquid ammonia refrigeration mechanism 220 . Wherein, the first switch valve 240 and the circulation switch valve 250 are both used for closing after the central control device sends a stop signal.

In this embodiment, after the central control device sends a stop signal, the first on-off valve 240 isolates the purification mechanism 130 from the liquefaction and purification mechanism 210, which ensures that the liquid carbon dioxide is stored in the liquefaction and purification mechanism 210 and the storage tank 230, and reduces the amount of liquid carbon dioxide. The leakage probability of carbon dioxide, and the circulation switch valve 250 blocks the refrigeration cycle path between the liquefaction purification mechanism 210 and the liquid ammonia refrigeration mechanism 220, ensuring that the liquid ammonia is isolated in the liquid ammonia refrigeration mechanism 220, reducing the leakage probability of liquid ammonia , so that the timeliness and safety of emergency response in emergency and abnormal situations can be improved. Furthermore, in this embodiment, the raw material gas provided by the raw material gas supply device contains gases such as carbon dioxide, sulfides, nitrates, and hydrocarbons.

In one embodiment, please refer to FIG. 1 , the gas separation device 100 further includes a second on-off valve 150 , the first end of the second on-off valve 150 is connected to the raw gas supply device, and the second on-off valve 150 is connected to the raw gas supply device. The second end of the switch valve 150 is connected to the input end of the compression mechanism 110 , the second switch valve 150 is used to open and close the input end of the compression mechanism 110 , and the second switch valve 150 is used to control the The device turns off after a stop signal. In this embodiment, the second on-off valve 150 is used as the feed switch of the compression mechanism 110, and the second on-off valve 150 is closed after the central control device sends a stop signal, so that the gas in the raw gas supply device is closed. The raw material gas is blocked, preventing the raw material gas in the raw material gas supply device from continuing to enter the compression mechanism 110, reducing the continued acquisition of raw material gas by the liquid carbon dioxide production equipment, thereby reducing the continuous production of liquid carbon dioxide, so that the liquid carbon dioxide continues to be produced. The production equipment stops the production of liquid carbon dioxide more quickly, avoiding the further deterioration of the leakage accident of liquid carbon dioxide.

Further, the gas separation device 100 further includes a first vent valve 160, the first end of the first vent valve 160 is connected to the first end of the second on-off valve 150, and the first vent valve 160 has a The second end is used to communicate with the external atmosphere, and the first vent valve 160 is used to open after the central control device sends a stop signal. In this embodiment, the first vent valve 160 is located at the front end of the second on-off valve 150 , that is, the first end of the first vent valve 160 is located between the raw gas supply device and the second on-off valve. Between 150 and 150 , the first vent valve 160 releases the raw material gas supplied by the raw material gas supply device, so that the raw material gas supplied to the liquid carbon dioxide production equipment is discharged to the external environment through the first vent valve 160 . In this way, after the central control device sends a stop signal, that is, when an emergency abnormality occurs, the first vent valve 160 is opened and the raw gas output from the raw gas supply device is vented, thereby reducing the amount of raw gas in the pipeline. Squeeze the second on-off valve 150, that is, reduce the air pressure at the first end of the second on-off valve 150, avoid the situation that the internal pressure of the first end of the second on-off valve 150 is too large, and effectively Therefore, the second on-off valve 150 and the raw material pipeline at the front end are properly protected, and the probability of an overpressure safety accident of the second on-off valve 150 and the raw material pipeline on the front end is reduced.

In one embodiment, please refer to FIG. 1 , the gas separation device 100 further includes a third on-off valve 170 , the first end of the third on-off valve 170 is connected to the compression mechanism 110 , and the third on-off valve 170 is connected to the compression mechanism 110 . The second end of the valve 170 is used to communicate with the outside atmosphere, and the third switch valve 170 is used to open after the central control device sends a stop signal. In this embodiment, the third on-off valve 170 is connected to the compression mechanism 110, and the compression mechanism 110 compresses the raw gas. After the central control device sends a stop signal, there is still a large amount of high-pressure raw material gas remaining in the compression mechanism 110, the main component of which is gaseous carbon dioxide. The third on-off valve 170 communicates the compression mechanism 110 with the outside, so that the raw material gas in the compression mechanism 110 is released, so that the pressure in the compression mechanism 110 is released to prevent overpressure, and a large amount of The discharge of gaseous carbon dioxide effectively prevents the continuous production of liquid carbon dioxide, thereby avoiding the further deterioration of the leakage accident of liquid carbon dioxide.

Further, the compression mechanism includes a plurality of cascaded compressors, and the third switch valve includes a plurality of pilot shower control valves, each of which is connected to one of the compressors. In this embodiment, a plurality of the compressors perform multi-stage compression on the raw material gas, so as to facilitate the separation of impurities and unnecessary gases from the gaseous carbon dioxide, thereby facilitating the subsequent obtaining of gaseous carbon dioxide with higher purity. By adding one of the guide shower program control valve to each of the compressors, the compressors of the compression mechanism can simultaneously discharge the raw material gas, which speeds up the release of the raw material gas, so that the inside of the compression mechanism is The pressure decay rate is increased. In this way, when the pressure in the compression mechanism is reduced to a certain pressure value, for example, the pressure value of the first end of the compression mechanism is reduced to a low pressure interlock value, the central control device sends each compressor to stop signal to stop the compression mechanism.

In one of the embodiments, please refer to FIG. 1 , the gas separation device further includes a pressure detector, the pressure detector is connected to the input end of the compression mechanism, and the pressure detector is used to detect the pressure of the compression mechanism. Inlet pressure at the input. In this embodiment, the pressure detector detects the pressure at the input end of the compression mechanism in real time, that is, monitors the inlet pressure of the compression mechanism. After the central control device sends a stop signal, the second on-off valve is closed, the first vent valve and the third on-off valve are opened, and there is no feed gas input to the inlet of the compression mechanism at this time, and, The residual raw material gas in the compression mechanism is vented through the third on-off valve, so that the pressure in the compression mechanism is gradually reduced. In order to protect the pressure at the inlet pipe of the compression mechanism from being pumped into negative pressure, when the pressure detector detects that the inlet pressure value of the input end of the compression mechanism is reduced to the low pressure interlock value, the central control device sends the The compressor sends a stop signal to stop the operation of the compression mechanism, so as to prevent the safety accident of deformation or even damage due to the negative pressure of the pipeline. In another embodiment, the circulation switch valve is also connected with a pressure detector for detecting the inlet pressure value of the liquid ammonia refrigeration mechanism, and when the inlet pressure value of the liquid ammonia refrigeration mechanism decreases to the low pressure interlock shutdown value of the refrigeration unit The central control device sends a shutdown signal to the liquid ammonia refrigeration mechanism to stop the operation of the liquid ammonia refrigeration mechanism, thereby protecting the pressure at the inlet pipeline of the liquid ammonia refrigeration mechanism from being pumped into negative pressure and preventing deformation due to negative pipeline pressure. or even disrupted safety incidents.

In one embodiment, please refer to FIG. 1 , the gas separation device 100 further includes a fourth on-off valve 180 , the first end of the fourth on-off valve 180 is connected to the output end of the oxygen supply mechanism 140 , so The second end of the fourth on-off valve 180 is connected to the input end of the compression mechanism 110 , and the fourth on-off valve 180 is used to close after the central control device sends a stop signal. In this embodiment, the oxygen supply mechanism 140 provides oxygen for the compression mechanism 110 so as to react with the impurity gas in the raw material gas, such as hydrocarbons, so that part of the impurity gas in the raw material gas is removed. After the central control device sends a stop signal, the fourth switch valve 180 is closed, which reduces the oxygen in the oxygen supply mechanism 140 and continues to be injected into the compression mechanism 110 and prevents the internal pressure of the compression mechanism 110 from increasing. In this case, the drop rate of the internal pressure of the compression mechanism 110 is further improved, and at the same time, it is avoided that too much oxygen enters the system without being consumed, resulting in an oxygen-rich dangerous environment. In another embodiment, when the fourth on-off valve 180 is closed, the dehydrocarbon mechanism 120 also stops running. Therefore, it is avoided that the gaseous carbon dioxide in the dehydrocarbonation mechanism 120 is evacuated and dry-burning damages the equipment or causes a fire.

In one embodiment, please refer to FIG. 1 , the gas separation device 100 further includes a second vent valve 190 , the first end of the second vent valve 190 is connected to the purification mechanism 130 , and the second vent valve 190 is connected to the purification mechanism 130 . The second end of the valve 190 is used for communicating with the outside atmosphere, and the second vent valve 190 is used for opening after the central control device sends a stop signal. In this embodiment, the first end of the second vent valve 190 is located between the purification mechanism 130 and the first switch valve 240 , the residue in the purification mechanism 130 is gaseous carbon dioxide, and the liquefaction purification mechanism 210 is liquid carbon dioxide, and the second vent valve 190 discharges the gaseous carbon dioxide in the purification mechanism 130 to realize the venting of the purification mechanism 130, thereby realizing the internal pressure relief of the gas separation device 100, The probability of damage to the gas separation device 100 is reduced.

In one embodiment, the liquefaction and purification device further includes a plurality of trigger receivers, the first switch valve and the circulation switch valve are respectively connected to one of the trigger receivers, and the trigger receiver is used for receiving all the trigger receivers. The stop signal issued by the central control device. In this embodiment, the trigger receiver is signal-connected with the central control device, the central control device sends a stop signal to the liquid carbon dioxide production device, and the stop signal is finally received by the trigger receiver, the The trigger receiver also acts as a controller to control the opening and closing of the first on-off valve and the cycle on-off valve, so as to control the first on-off valve and all the other on-off valves at the first time of the stop signal sent by the central control device. Close the cycle switch valve. In another embodiment, the second on-off valve, the first vent valve, the third on-off valve, the fourth on-off valve and the second vent valve are respectively connected to a trigger receiver, By sending different opening and closing control signals to different valves, the opening and closing states of different valves are realized.

In the above embodiments, each mechanism and each valve are connected by pipes. In order to protect the safety of the production equipment system and ensure the safety and reliability of one-key parking, the sequence of the change of the opening and closing states of each valve is carried out, as follows:

Step 1. After the central control device sends a stop signal, the first vent valve 160 is opened, the second on-off valve 150 and the first vent valve 160 together form a set of switching valve groups, the third on-off valve 170 and The second vent valve 190 is opened, and the fourth switch valve 180 is closed;

Step 2. When the inlet pressure value of the compression mechanism 110 decreases to the low pressure interlock value, the central control device controls the compression mechanism 110 to stop;

Step 3. When each compressor in the compression mechanism 110 is stopped, the central control device controls the first switch valve 240 to change from open to closed;

Step 4. When the inlet pressure value of the liquid ammonia refrigeration mechanism 220 is reduced to the low pressure interlock shutdown value of the refrigeration unit, the central control device controls the liquid ammonia refrigeration mechanism 220 to shut down;

Step 5. When each refrigeration unit in the liquid ammonia refrigeration mechanism 220 is shut down, the central control device controls the circulation switch valve 250 to change from open to closed.

Wherein, the order of step 2 and step 3 cannot be reversed, and step 2 must be followed by step 3; and the order of step 4 and step 5 cannot be reversed, and step 4 must be followed by step 5.

The present application also provides a liquid carbon dioxide production system, including the liquid carbon dioxide production equipment described in any of the above embodiments. In this embodiment, the liquid carbon dioxide production equipment includes a gas separation device and a liquefaction purification device. The gas separation device includes a compression mechanism, a dehydrocarbon mechanism, a purification mechanism and an oxygen supply mechanism. The output end of the oxygen supply mechanism is connected with the input end of the compression mechanism. The input end of the compression mechanism is also used for connecting with the feed gas supply device, and the output end of the compression mechanism is connected with the input end of the dehydrocarbon mechanism. The output end of the dehydrocarbonation mechanism is connected with the input end of the purification mechanism. The liquefaction and purification device includes a liquefaction and purification mechanism, a liquid ammonia refrigeration mechanism, a storage tank, a first on-off valve and a circulation on-off valve. The output end of the purification mechanism is connected to the input end of the liquefaction purification mechanism through the first switch valve. The output end of the liquefaction and purification mechanism is connected with the storage tank. The storage tank is used for storing the liquid carbon dioxide in the liquefaction and purification mechanism. The liquefaction and purification mechanism is connected to the liquid ammonia refrigeration mechanism through the circulation switch valve. The circulation switch valve is used for circulating the liquid ammonia refrigerant between the liquefaction and purification mechanism and the liquid ammonia refrigeration mechanism. Wherein, the first switch valve and the circulation switch valve are both used for closing after the central control device sends a stop signal. After the central control device sends a stop signal, the first switch valve isolates the purification mechanism from the liquefaction and purification mechanism, ensuring that the liquid carbon dioxide is stored in the liquefaction purification mechanism and the storage tank, reducing the leakage probability of liquid carbon dioxide, while the circulation switch valve will liquefy the liquefaction and purification mechanism. The refrigeration cycle path between the purification mechanism and the liquid ammonia refrigeration mechanism is blocked, which ensures that the liquid ammonia is isolated in the liquid ammonia refrigeration mechanism, reduces the leakage probability of liquid ammonia, and enables the timeliness and safety of emergency treatment in emergency and abnormal situations. promote.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A liquid carbon dioxide production equipment, characterized in that, comprising:

A gas separation device, the gas separation device includes a compression mechanism, a dehydrocarbon mechanism, a purification mechanism and an oxygen supply mechanism, the output end of the oxygen supply mechanism is connected with the input end of the compression mechanism, and the input end of the compression mechanism is also It is used for connecting with the feed gas supply device, the output end of the compression mechanism is connected with the input end of the dehydrocarbon mechanism, and the output end of the dehydrocarbon mechanism is connected with the input end of the purification mechanism;

A liquefaction and purification device, the liquefaction and purification device includes a liquefaction and purification mechanism, a liquid ammonia refrigeration mechanism, a storage tank, a first switch valve and a circulation switch valve, and the output end of the purification mechanism communicates with the liquefaction and purification mechanism through the first switch valve The input end of the mechanism is connected, and the output end of the liquefaction and purification mechanism is connected to the storage tank. The storage tank is used to store the liquid carbon dioxide in the liquefaction and purification mechanism. The liquid ammonia refrigeration mechanism is connected, and the circulation switch valve is used for circulating the liquid ammonia refrigeration liquid between the liquefaction purification mechanism and the liquid ammonia refrigeration mechanism, wherein the first switch valve and the circulation switch Valves are used to close after the central control device sends a stop signal.
The liquid carbon dioxide production equipment according to claim 1, wherein the gas separation device further comprises a second on-off valve, the first end of the second on-off valve is connected to the raw material gas supply device, and the first on-off valve is connected to the raw material gas supply device. The second end of the second on-off valve is connected to the input end of the compression mechanism, the second on-off valve is used to open and close the input end of the compression mechanism, and the second on-off valve is used to send a stop signal to the central control device closed later.
The liquid carbon dioxide production equipment according to claim 2, wherein the gas separation device further comprises a first vent valve, the first end of the first vent valve is connected to the first end of the second on-off valve , the second end of the first vent valve is used to communicate with the external atmosphere, and the first vent valve is used to open after the central control device sends a stop signal.
The liquid carbon dioxide production equipment according to claim 3, wherein the first vent valve is located at the front end of the second on-off valve, and the first vent valve is used for the raw material supplied to the raw material gas supply device Air is released.
The liquid carbon dioxide production equipment according to claim 1, wherein the gas separation device further comprises a third on-off valve, the first end of the third on-off valve is connected to the compression mechanism, and the third on-off valve is connected to the compression mechanism. The second end of the valve is used to communicate with the external atmosphere, and the third switch valve is used to open after the central control device sends a stop signal.
The liquid carbon dioxide production equipment according to claim 5, wherein the compression mechanism comprises a plurality of cascaded compressors, the third on-off valve comprises a plurality of pilot program-controlled valves, each of the pilot program-controlled valves A valve is connected to one of the compressors.
The liquid carbon dioxide production equipment according to claim 1, wherein the gas separation device further comprises a pressure detector, the pressure detector is connected to the input end of the compression mechanism, and the pressure detector is used to detect the The inlet pressure at the input of the compression mechanism.
The liquid carbon dioxide production equipment according to claim 7, wherein the pressure detector is further connected to the circulation switch valve for detecting the inlet pressure value of the liquid ammonia refrigeration mechanism. When the value is reduced to the low pressure interlock shutdown value of the refrigeration unit, the central control device sends a shutdown signal to the liquid ammonia refrigeration mechanism.
The liquid carbon dioxide production equipment according to claim 1, wherein the gas separation device further comprises a fourth on-off valve, the first end of the fourth on-off valve is connected to the output end of the oxygen supply mechanism, so The second end of the fourth switch valve is connected to the input end of the compression mechanism, and the fourth switch valve is used to close after the central control device sends a stop signal.
The liquid carbon dioxide production equipment according to claim 1, wherein the gas separation device further comprises a second vent valve, the first end of the second vent valve is connected to the purification mechanism, and the second vent valve is connected to the purification mechanism. The second end of the valve is used for communicating with the outside atmosphere, and the second vent valve is used for opening after the central control device sends a stop signal.
The liquid carbon dioxide production equipment according to claim 1, wherein the liquefaction and purification device further comprises a plurality of trigger receivers, and the first on-off valve and the circulation on-off valve are respectively connected to one of the trigger receivers , the trigger receiver is used for receiving the parking signal sent by the central control device.
A liquid carbon dioxide production system, characterized by comprising the liquid carbon dioxide production equipment according to any one of claims 1 to 11.