Shandong Zhongjie Special Equipment Co., Ltd. specializes in the following products: 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, and CO2 storage tanks; pressure vessel products including denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; central air conditioning and ventilation 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.
The use of liquid nitrogen storage tanks in rapid freezing technology offers several advantages:
Rapid Freezing Speed: Liquid nitrogen has a low temperature of approximately -196 degrees Celsius. Using a liquid nitrogen tank for quick freezing can rapidly lower the surface temperature of food, achieving fast freezing. Compared to traditional freezing methods, liquid nitrogen freezing can significantly reduce freezing time while preserving the quality and texture of the food.
Uniformly Frozen Effect: The liquid nitrogen rapid freezing technology achieves quick and even freezing of food. Liquid nitrogen is喷射ed onto the food surface in a gaseous form, rapidly absorbing heat and transforming into a liquid, thereby ensuring uniform freezing of the food and preventing crystallization and lumping during the freezing process.
Maintain Food Quality: Quick-freezing with liquid nitrogen rapidly chills food, reducing crystallization and clumping during the freezing process, thereby preserving the quality and texture of the food. During the quick-freezing process, liquid nitrogen swiftly lowers the surface temperature of the food, forming minute frozen structures that effectively retain its moisture and nutritional content.
Flexibility and Adaptability: The liquid nitrogen tank can be adjusted and controlled to accommodate various food types and freezing requirements. The jet speed and angle of liquid nitrogen can be modified according to the size, shape, and freezing needs of the food to achieve optimal freezing results.
Environmental protection and energy-saving: Liquid nitrogen rapid freezing technology, compared to traditional freezing methods, can save energy and resources more effectively. Liquid nitrogen evaporates quickly during the freezing process, causing environmental pollution and generating waste water and gas.
Be mindful that when using liquid nitrogen tanks for rapid freezing, it is crucial to adhere to the relevant safety operating procedures and guidelines. Ensure that operators possess the necessary safety awareness and operational skills to prevent accidents. Additionally, consult

When initially using a liquid nitrogen tank, there are some precautions to consider for safe and efficient operation. Here are some suggested precautions:
Safe Operation: Liquid nitrogen is a low-temperature liquid with strong refrigerating and asphyxiating effects. When handling liquid nitrogen tanks, it is mandatory to wear appropriate personal protective equipment, such as insulated gloves and protective suits. Avoid direct contact with liquid nitrogen to prevent injury or other harm.
Ventilation Environment: Liquid nitrogen, upon evaporation, produces a significant amount of gas which may displace other gases, leading to a decrease in oxygen content in the air. Therefore, when using liquid nitrogen tanks, it is essential to ensure proper ventilation in the operating area to prevent oxygen deficiency.
Tank Inspection: Before first use of the liquid nitrogen tank, inspect the tank's appearance and seal carefully. Ensure there are no visible damages, leaks, or other safety hazards. If any issues are found, they should be addressed promptly by repairing or replacing the tank.
Tank Filling: Prior to the initial use of the liquid nitrogen tank, it is necessary to fill the tank with liquid nitrogen. During the filling process, adhere to the correct operational steps and safety protocols to ensure a safe and reliable filling procedure. Additionally, be mindful to control the filling speed and pressure to avoid excessive tank pressure and temperature rise.
Labeling and Record Keeping: Prior to the initial use of the liquid nitrogen tank, relevant information should be labeled on the tank, such as the storage medium, capacity, manufacturing date, etc. It is also recommended to establish a usage record for the tank, including filling dates, filling quantities, and usage details, for future tracking and management.
Note that the use of liquid nitrogen tanks involves safety risks such as low temperatures and high pressures. Operators should receive training and strictly adhere to the relevant operational procedures and safety measures. If unfamiliar with the operation or have any doubts, it is recommended to consult with experts or relevant institutions.

Liquid Oxygen Stations are facilities designed for storing and supplying liquid oxygen, with liquid oxygen tanks being a crucial component of these stations. Liquid oxygen tanks possess several important functions and features:
Store Liquid Oxygen: Liquid oxygen tanks are primarily used for storing liquid oxygen, cooling gaseous oxygen below its critical temperature to convert it into a liquid state. The storage density of liquid oxygen is high, allowing for the storage of large amounts of oxygen in a relatively small space.
Maintain Low Temperature: Liquid oxygen tanks are typically designed with a double-layer structure, separated by a vacuum layer between the inner and outer layers to reduce heat conduction and maintain low temperatures. This helps to preserve the低温 state of liquid oxygen, preventing premature vaporization.
Safety Design: During the design and manufacturing process, liquid oxygen tanks must prioritize safety. They are typically made from high-strength materials such as stainless steel or aluminum alloy to withstand high pressure and low-temperature conditions. Additionally, liquid oxygen tanks are equipped with safety valves, pressure sensors, and temperature sensors to ensure that the internal pressure and temperature of the tank remain within safe limits.
Supply System Connection: Liquid oxygen tanks are typically connected to the supply system to transport liquid oxygen to the required locations. The supply system includes liquid oxygen pumps, pipes, valves, and other equipment, which are used to extract liquid oxygen from the tank and deliver it to the user end.
Liquid oxygen storage tanks play a crucial role in storing and maintaining liquid oxygen at oxygen stations. Their design and operation must strictly adhere to relevant safety regulations and procedures to ensure the safety and reliability of the storage and supply process.

The leak treatment methods for liquid argon storage tanks mainly include the following steps:
Leak Detection: Leaks in liquid argon tanks are identified through odors, gas detection equipment, or abnormal pressure in liquid argon storage tanks.
Confirm air leakage location: Use gas detection equipment or foam leak detection agents, etc., to pinpoint the exact location of air leakage. Inspect tank interfaces, valves, pipeline connections, and other areas to locate air leakage points.
Seal Air Leaks: Take appropriate measures to stop the air leak source based on the leak location. For instance, for leaks at interfaces, inspect and adjust sealing washers or tighten bolts; for valve leaks, check and replace the seals.
Isolate Air Leaks: During the process of dealing with air leaks, it is necessary to isolate the leaky areas to ensure personnel safety. Set up warning signs, restrict access to the area, and take necessary protective measures, such as wearing protective masks and gloves.
Drain liquid argon: If a leak cannot be repaired immediately or the leakage rate is high, consider draining the liquid argon. By gradually reducing the pressure inside the storage tank, convert the liquid argon into gas, reducing the risk of leakage.
Ventilation Treatment: During the leak treatment process, ensure good ventilation and promptly remove gases produced by the evaporation of liquid argon. This can be achieved by natural ventilation or using ventilation equipment to expel the evaporated gas of liquid argon outside.
Safety Assessment and Repair: After completing the air leakage treatment, conduct a safety assessment to ensure the tank's safety. Based on the assessment results, carry out necessary repairs and maintenance to prevent the recurrence of air leakage.
Note that liquid argon is a low-temperature liquid with a low boiling and freezing point. Caution is required when handling leaks to avoid contact, which can cause chills. When dealing with a leaking liquid argon tank, operations should be conducted by personnel, following relevant safety procedures and standards.
Our company places great emphasis on technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, equipped with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We have over 600 types of equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. The key products and technologies we have developed, such as welding for temperature and pressure vessels, biomass boiler emission reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have cumulatively obtained 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Yajiang Li of Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + wire filling argon arc welding (PAW-GTAW) technology. The provincial-level scientific and technological achievement identification has determined that the technology level in the field of deep cryogenic container manufacturing has reached an international standard. Choose Zhongjie Special Equipment, and let's create brilliance together!