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The dangerous goods transport industry has replied to a wave, and the most dangerous thing is liquid nitrogen.
Tankers, LNG tankers secretly load liquid oxygen.
Liquid argon, with the bulk density is too different, how much can be calculated under the overload? The traffic police traffic police of the law enforcement department are unable to screen these cryogenic liquids at the level of culture and technology, and even hide far away when they see the tanker, and overload if they want to, no one understands.
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The vacuum tank is a double-layer metal tank, the inner tank is a stainless steel pressure vessel with low temperature resistance, and the outer tank is made of carbon steel material, and the interlayer is filled with thermal insulation material and vacuumed. The vacuum tank is transported to the site as a whole after the factory manufacturing and pressure test is completed. The total storage capacity of LNG is less than 1000m3, and multiple vacuum tanks are generally used for centralized storage, and the maximum volume of a single tank of vacuum tanks currently used in China is 150m3.
The process flow of the vacuum tank is relatively simple, the supercharger is generally used to pressurize the storage tank, and the material enters the vaporizer by pressure artesian, without using power equipment, and the energy consumption is low, so the small LNG gasification stations at home and abroad basically all adopt the form of vacuum tank.
The inner tank of the sub-mother tank is a plurality of low-temperature-resistant stainless steel pressure vessels, the outer tank is a large carbon steel container covered outside a plurality of inner tanks, and the inner and outer tanks are also filled with thermal insulation materials, and the interlayer is filled with dry nitrogen to prevent the entry of humid air. The inner tank of the mother and child tank is manufactured in the factory, and the pressure test is transported to the site, and the outer tank is installed on site. Storage scale in 1000m3 to 5000m3 storage and distribution station, according to the situation can choose the mother tank or atmospheric tank storage, due to the inner tank transportation requirements, the current domestic single sub-tank can do a maximum of 250m3, the use of the mother tank gasification process and vacuum tank is roughly the same, because the interlayer needs to pass nitrogen, the device has a set of liquid nitrogen device.
The operating pressure of the LNG cryogenic storage tank is 15kpa, the operating temperature is -162, and it is a flat-bottomed double-walled cylindrical shape. Its tank body is composed of two layers inside and outside, and the two layers are thermal insulation structures and cold insulation layers. The inner tank is used to store LNG, while the outer shell acts as a protective and cold insulator.
In order to reduce the transfer of heat from the outside to the tank, the inner and outer tanks are designed to be separate and independent. The tank item is a self-supporting vault, and the inner tank item must have sufficient strength and stability to withstand the external pressure caused by the cold insulation material and the internal pressure generated by the internal gas.
The storage tank uses pearlescent sand as the cold insulation material, and is filled with dry nitrogen to ensure the micro positive pressure of the interlayer, and the insulation material is isolated from the atmosphere, which avoids the influence of atmospheric pressure or temperature change and the humid air enters the cold insulation layer between the inner and outer tanks, which increases the service life of the cold insulation material and effectively guarantees and improves the use effect of the cold insulation material. When designing and manufacturing insulated structures, care must be taken to protect against moisture.
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Cryogenic liquids. Liquid oxygen tank, car structure and principle. Oh my God, this is an engineer, but the common people don't know that much.
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It mainly adopts the principle of condensation, in this case, its structural principle, mainly adopts a cooling pipe design.
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Cryogenic liquids.
Cryogenic liquid filling.
Abstract:When the sales management personnel of cryogenic liquids begin to handle the sales procedures for the users, they should do the following: 1. When the sales staff begins to handle the sales procedures for the users, they should first conduct a safety inspection on the user's car tanker and eliminate the hidden danger of the accident before filling.
1. Safety management before filling: When the sales management personnel of cryogenic liquids begin to handle the sales procedures for users, they should:
Cryogenic liquid storage tanks are safe to use.
The cryogenic liquid storage tank is a jacketed vacuum powder thermothermal pressure vessel specially used for storing and supplying cryogenic liquefied gases (such as liquid nitrogen, liquid oxygen, liquid argon, liquid carbon dioxide, etc.). It has been widely used in industrial production and daily life. In this paper, through the analysis of the hazard characteristics of cryogenic liquids, combined with the various gas supply modes of cryogenic liquid storage tanks, the basic requirements and safety are briefly described.
Rules for the management of the use of cryogenic liquid storage tanks.
The cryogenic liquid storage tank is a jacketed vacuum powder adiabatic pressure vessel specially used for the storage and storage of cryogenic liquefied gases (such as liquid nitrogen, liquid oxygen, liquid argon, liquid carbon dioxide, etc.). It has been widely used in industrial production and daily life. In this paper, through the analysis of the hazard characteristics of cryogenic liquids, various gas supply modes of cryogenic liquid storage tanks are combined.
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and the working pressure is mainly selected for the downstream gas demand pressure. The pressure of the tank is high, and the pressure of the transport vehicle is higher when the liquid is loaded. Otherwise, the tank pressure should be reduced (vented) or a transport vehicle with a dump pump should be used.
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Oxygen is directly given to the patient, liquid oxygen is a cryogenic liquid, after gasification, the temperature reaches room temperature oxygen can be used, generally liquid oxygen is packed in the storage tank, a vaporizer is needed, and a voltage stabilizing device is also needed.
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The working principle of medical liquid oxygen is a bit difficult to understand. I guess it's the principle of production. It is still produced by low-temperature multi-stage distillation. The higher your purity requirements, the more plates you need to rectify, or the more structured packing you need.
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(1) The tanker can only enter the filling site for irrigation only after obtaining the consent of the relevant personnel;
2) Filling personnel and transportation personnel must stick to their posts and must not leave the scene;
3) The filling operation must be carried out slowly, and the cooling of the filling pipeline should be slow and even;
4) During the filling period, the car engine shall not start, shall not carry out vehicle maintenance, shall not use walkie-talkies, mobile phones, etc.;
5) The filling personnel should always observe the pressure in the tank, check the situation of each part, and deal with the abnormality in time;
6) The filling rate of the tanker shall not be greater than, and it is strictly forbidden to overfill;
7) After the filling is completed, the filling valve should be closed in time, the residual liquid and residual pressure in the pipe should be discharged, and the connecting hose should be removed.
8) When the valves, instruments, pipe connections, etc. on the equipment are frozen, it is strictly forbidden to beat them with a hammer or heat them with an open flame. It is advisable to use 70-80 degrees of clean and oil-free hot air, hot nitrogen or warm water for thawing and thawing.
9) After confirming that the oxygen content in the air on the site is qualified, the car tanker is allowed to leave;
10) Conscientiously do a good job of filling records, records should be true, accurate and traceable.
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CO2 dewars are filled in the same way as liquid oxygen tanks.
The physical properties of liquid carbon dioxide and liquid liquid oxygen are different, the general liquid carbon dioxide storage tank temperature is -20, and the liquid oxygen is -186, the similarity between the two is that they are thermal insulation storage tanks, including PU insulation or double-layer vacuum thermal insulation.
However, the material requirements of the tank liner of carbon dioxide are not as high as those of liquid oxygen storage tanks, after all, the temperature is not as low as that of liquid oxygen.
Another is the design pressure, the design pressure of the carbon dioxide tanker is generally, and the liquid oxygen tanker is generally a dewar, which is a stainless steel pressure vessel with super vacuum insulation, which is designed for the storage, transportation and use of liquid oxygen, liquid nitrogen, liquid argon or carbon dioxide.
These containers are manufactured to DOT4L standards for reliable and economical transport and storage of cryogenic liquid gases, as well as for on-site storage and ** cryogenic liquid gases in a wide range of applications.
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Search, Heyuan Jinyuan Gas ****, yes, there are more than 10 tankers, more than 10 years of distribution experience.
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No, you cannot.
Liquid oxygen tankers are mainly liquid oxygen, mainly for the import and export of liquids.
The gaseous outlet has only a drain valve.
Moreover, the normal pressure of the tanker is 8-16 kg, and the normal pressure of the cylinder should be charged to 120kg, and the pressure of the tanker cannot be reached.
The main thing is insecurity.
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Carbon dioxide is very easy to be liquefied, and liquefaction can be achieved by pressurization at room temperature, so there is no need to make a thermal insulation structure for its storage tank, and ordinary pressure-resistant cylinders can be used.
Oxygen is extremely difficult to liquefy, and it is impossible to liquefy by pressure at room temperature, so it must be stored in a storage tank with excellent thermal insulation performance, and the pressure resistance of this thermal storage tank is very poor (similar to the principle of a hot water bottle, but it is a multi-layer hollow high vacuum structure), and can only be stored with a special dewar.
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One is stored as a non-flammable liquefied gas CO2
One stored is the accelerant O2
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Under normal circumstances, it is pressed by the supercharger that comes with the tanker, and when the pressure reaches the maximum value, it is then driven through the pressure. Of course, there are also manufacturers with pumps on the tanker, and it is very fast to pump with a pump!
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At room temperature, nitrogen is a gas, and pressurization or cooling can liquefy gaseous nitrogen to become liquid nitrogen. However, in practice, it is not advisable to produce liquid nitrogen by cooling, and the temperature requirements are too high, so nitrogen is generally pressurized to become liquid nitrogen.
Self-pressurized.
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Look at the structure of the tank, some tanks have pumps, and some are self-pressurizing tanks.