Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulated cryogenic pressure vessels such as LNG storage tanks, oxygen-nitrogen-argon storage tanks, CO2 storage tanks, etc.; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment sets; central air conditioning and HVAC equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Liquid nitrogen cylinders are widely used in various industries, primarily in the following aspects:
Industry: Liquid nitrogen tanks are used in the field for storing and supplying liquid nitrogen, which is essential for low-temperature cryopreservation of biological samples, cells, tissues, and vaccines. They are widely employed in biopharmaceutical research institutions and biobanks, among other organizations.
Research Studies: Liquid nitrogen tanks are used to provide low-temperature environments in scientific research and laboratories, for cryogenic storage and cryogenic experiments. Liquid nitrogen tanks play a significant role in experimental research across various fields such as physics, chemistry, biology, and materials science.
Metalworking Industry: Liquid nitrogen tanks are used in the metalworking and welding industries for providing low-temperature cooling, used in processes such as metal cutting, welding, and heat treatment. Liquid nitrogen tanks can provide low temperatures to achieve the required hardness and toughness of the metal during processing.
Food Industry: Liquid nitrogen tanks are used in the food industry for freezing and refrigeration of food products, such as frozen meats, frozen fruits, and frozen seafood. The low temperature of liquid nitrogen can quickly freeze food, preserving its freshness and quality.
Semiconductor Industry: Liquid nitrogen tanks are used in semiconductor manufacturing and the electronics industry to provide low-temperature environments for the freezing and preparation of semiconductor materials. The low temperature of liquid nitrogen enhances the purity and performance of semiconductor materials.
The configuration of liquid nitrogen cylinders typically includes the following aspects:
Vessel Structure: Liquid nitrogen tanks typically feature a double or multi-layered design, filled with insulating material in between to minimize heat transfer and evaporation of the liquid nitrogen. The tank material is usually stainless steel or aluminum alloy, offering excellent corrosion and low-temperature resistance.
Insulation Layer: The insulation layer of liquid nitrogen tanks commonly employs multi-layered insulation materials such as polyethylene foam, glass fiber, and vacuum layers, to reduce heat transfer and evaporation of liquid nitrogen.
Temperature Control System: Liquid nitrogen tanks are typically equipped with a temperature control system to regulate the tank's temperature, ensuring maintenance of the liquid's state.

When selecting the support for a liquid argon storage tank, consider the following factors:
Load Capacity: The support must be able to bear the weight of the liquid argon tank. Select a support with sufficient load capacity based on the tank's capacity and dimensions. Typically, the weight of the liquid argon tank is specified in the design specifications, which can be used to determine the support's load-bearing capacity.
Stability: The support must offer adequate stability to prevent the tank from tilting or swaying during use. The design of the support should consider the tank's center of gravity and its changes to provide stable support.
Corrosion Resistance: Liquid argon has low temperature and corrosive properties. The support material should have excellent corrosion resistance to prevent corrosion and damage. Common support materials include stainless steel, aluminum alloy, etc.
Insulation: Liquid argon storage tanks typically require thermal insulation. The supports should possess certain insulation properties to minimize heat transfer and evaporation of liquid argon. The design of the supports should consider the installation and protection of the insulation layer.
Installation and Maintenance: The bracket should be designed for ease of installation and maintenance, facilitating the tank's setup and routine upkeep tasks.
When selecting the support for liquid argon tanks, it is recommended to consult with engineers or suppliers. Choose the appropriate support based on the specific tank requirements and usage environment. Additionally, adhere to relevant design specifications and safety standards to ensure the quality and reliability of the support.

Prior to filling the liquid nitrogen tank, the following checks must be conducted:
Tank exterior inspection: Check for any obvious damage, deformation, or corrosion on the tank's exterior, including the tank wall, valves, pipes, and joints.
Sealability Inspection: Check the tank's sealing performance, including inspecting for any leakage at valves and pipe connections, to ensure the tank has good sealing integrity.
Pressure Check: Verify that the tank's pressure gauge is functioning properly and that the pressure is within the normal range to ensure the tank operates normally.
Level Check: Inspect the liquid level in the tank to ensure it is within the normal range, preventing issues caused by levels that are too high or too low.
Insulation Layer Inspection: Check for any damage or detachment in the storage tank's insulation layer to ensure effective insulation and reduce evaporation losses of liquid nitrogen.
Leakage Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including frost, ice, or liquid nitrogen stains on the ground.
Safety Equipment Inspection: Verify that the safety equipment of the storage tank, such as leak detectors, alarm systems, and safety valves, are functioning properly to ensure the tank's safety.
Clean Inspection: Ensure the interior of the tank is clean, free of accumulated impurities and dirt, to maintain the tank's cleanliness and hygiene.
The above details the checks required prior to filling the liquid nitrogen storage tank, ensuring the safe operation of the tank and proper storage of liquid nitrogen. During the inspection process, strict adherence to operational procedures and safety standards must be maintained to ensure operational safety.

The application of strain hardening in austenitic stainless steel on low-temperature pressure vessels is a common method, which can enhance the material's strength and durability. Here are some details regarding the application of strain-hardened austenitic stainless steel on low-temperature pressure vessels:
Principle of Strain Hardening: Strain hardening is achieved by introducing plastic deformation into the material, which alters the crystal structure, thereby enhancing the material's strength. In Austenitic stainless steel, strain can be introduced through methods such as cold working (e.g., cold rolling, cold drawing) or heat treatment (e.g., solution treatment and cold deformation), causing dislocation and grain boundary sliding in the crystal structure, which in turn increases the material's strength.
Advantages in Low-Temperature Applications: Austenitic stainless steel exhibits excellent corrosion resistance and low-temperature toughness in cold environments. Strain hardening further enhances the strength and durability of Austenitic stainless steel, enabling it to perform in low-temperature pressure vessels. Under low-temperature conditions, strain hardening effectively resists plastic deformation and fracture, improving the material's tensile strength and impact resistance.
Application Cases: Austenitic stainless steel's strain-hardening is widely used in low-temperature pressure vessels. For example, strain-hardened austenitic stainless steel is commonly used as a structural material in low-temperature containers such as liquid nitrogen, liquid oxygen, and liquid argon tanks. These vessels must withstand high pressure and impact loads at low temperatures. Strain-hardening enhances the material's strength and durability, ensuring safe operation of the containers.
It is important to note that the strain hardening of austenitic stainless steel must be conducted at the appropriate temperature and deformation conditions to avoid excessive deformation and material embrittlement. When designing and manufacturing low-temperature pressure vessels, the specific engineering requirements and material characteristics should be considered to rationally select and apply the strain hardening of austenitic stainless steel.
ZJ Special Equipment adheres to the great vision of "realizing employees' dreams, creating value for customers, and striving for the prosperity and strength of our motherland," focusing solely on the development of green energy equipment industry, dedicated to offering society high-quality and cost-effective products and services!