Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Development Zone, Heze City, with a registered capital of 50 million yuan and total assets of 500 million yuan. The company has 7 business centers: boiler, deep-freeze container, pressure vessel, central air conditioning, engineering installation, international trade, and Internet of Things. It operates three factory sites at Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 people, including 247 engineering and technical personnel and 82 middle-level technical staff. Recognized as a "High-tech Enterprise" by the Science and Technology Department in December 2016, as a "Specialized and New Enterprise of Shandong Province" by the Ministry of Industry and Information Technology in June 2021, as a "Deer Enterprise of Shandong Province" by the Ministry of Industry and Information Technology in June 2022, and as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology in August 2022.
The use of liquid nitrogen storage tanks in rapid freezing technology offers several advantages:
Rapid Freezing Speed: The temperature of liquid nitrogen is low, approximately -196 degrees Celsius. Using a liquid nitrogen tank for rapid freezing can quickly 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.
Uniform Cryogenic Effect: The liquid nitrogen flash freezing technique enables rapid and even freezing of food. Liquid nitrogen is喷射 onto the food surface in a gaseous state, quickly absorbing heat and transforming into a liquid, thereby achieving even freezing of the food and preventing crystallization and clumping during the freezing process.
Maintain Food Quality: Rapid freezing with liquid nitrogen quickly chills food, reducing crystallization and clumping during the freezing process, thereby preserving the quality and texture of the food. During the rapid freezing process, liquid nitrogen rapidly lowers the surface temperature of the food, forming tiny frozen structures, effectively retaining the food's 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 quick-freezing technology can save more energy and resources compared to traditional freezing methods. 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 follow the relevant safety operation procedures and guidelines. Ensure that operators possess the necessary safety awareness and operational skills to prevent any accidental incidents. Additionally, consult

Low-temperature liquid oxygen storage tanks typically require certain safety accessories to ensure safe operation and to address potential risks. Here are some common safety accessories for low-temperature liquid oxygen storage tanks:
Pressure Sensor: Used to monitor pressure changes within storage tanks. If the pressure exceeds the set range, it will trigger an alarm or automatically stop filling measures to prevent overpressure in the tank.
Safety Valve: Used to automatically release gas when the pressure inside the storage tank exceeds the set value, preventing overpressure. The safety valve should be selected and installed based on the design pressure and capacity of the tank.
Pressure Relief Device: Used to release gas into a safe area when the pressure inside the storage tank is too high, thereby reducing the pressure on the tank. The pressure relief device typically includes relief valves, relief pipes, etc.
Level sensor: Used to monitor the level change of liquid oxygen inside storage tanks to ensure an adequate supply of liquid oxygen and prevent overfilling.
Temperature Sensor: Used to monitor temperature changes within storage tanks to ensure the liquid oxygen inside remains within a safe temperature range.
Fire Detection and Fire Extinguishing Systems: Designed to monitor fire risks surrounding storage tanks and activate fire extinguishing systems when necessary to prevent the spread of fires to adjacent areas.

During the welding process of low-temperature liquid storage tanks, controlling the occurrence of welding cracks is crucial. The following are some methods and measures for controlling welding cracks:
Appropriate Welding Techniques: Selecting the appropriate welding process and parameters helps to reduce welding heat input and thermal stress. Utilizing low heat input welding methods, such as pulsed welding and laser welding, can decrease the temperature gradient and residual stress in the heat-affected zone.
Preheating and post-heat treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct a suitable post-heat treatment, such as annealing or stress-relieving heat treatment, after welding to minimize residual stress and improve weld toughness.
Select appropriate welding materials: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select the appropriate welding materials based on the storage tank's operating conditions and requirements, such as low-alloy steel, stainless steel, etc.
Control Welding Process: Regulate parameters and operations during welding to minimize the risk of welding cracks. Pay attention to factors such as welding speed, current, voltage, and welding sequence to avoid overheating or rapid welding, thereby reducing the accumulation of thermal and residual stresses.
Inspection and Evaluation: Conduct non-destructive testing on weld seams after welding, such as ultrasonic testing and X-ray testing, to assess welding quality and detect cracks. Promptly identify and repair welding cracks to ensure the integrity and safety of the weld joints.
It's important to note that controlling welding cracks is a complex process requiring a comprehensive consideration of factors such as material, welding techniques, and operations. When welding low-temperature liquid storage tanks, it is recommended to consult with a welding engineer or relevant institutions for guidance to ensure both welding quality and tank safety.

The liquid nitrogen tank features the following characteristics during the construction process:
Low Temperature Construction: The construction of liquid nitrogen tanks must be carried out in low-temperature conditions, as the boiling point of liquid nitrogen is low, approximately -196 degrees Celsius. Construction personnel must take appropriate protective measures, such as wearing thermal protective clothing and gloves, to safeguard against low-temperature injuries.
Welding Technology: A substantial amount of welding is required during the manufacturing process of liquid nitrogen tanks, including the connections of the tank walls, bottom plates, top plates, and seams. Welding technology is crucial for the quality and safety of the tanks, necessitating the use of appropriate welding methods and materials to ensure the strength and sealability of the seams.
Insulation Layer Installation: Liquid nitrogen tanks must have excellent insulation properties to minimize heat conduction and retain low temperatures. The installation of the insulation layer requires materials such as polyester foam and glass wool, ensuring the thickness and quality of the insulation layer.
Proper installation steps for liquid nitrogen tanks are as follows:
Site Preparation: Select a suitable location for tank installation, ensuring the ground is level, strong, and has adequate load-bearing capacity. The site should be kept away from flammable, explosive materials, and other hazardous sources.
Foundation Construction: Construction of the foundation based on the tank's dimensions and weight, including excavation of the foundation pit and pouring concrete foundation. The design and construction of the foundation should comply with relevant standards and regulations.
Tank Installation: Transport the tank to the site and perform a vertical installation. Appropriate lifting equipment and safety measures are required during the installation process to ensure the stability and safety of the tank.
Pipe Connections: Connect the storage tank to the relevant pipeline system as required, including intake pipes, exhaust pipes, and liquid supply pipes, etc. Sealing and testing must be conducted during the connection process to ensure the safety of the pipes.
Zhong Jie Special Equipment upholds the grand vision of "Realizing employees' dreams, creating value for customers, and striving for the prosperity and strength of our motherland," and is dedicated to the development of green energy equipment. We offer society products and services with high cost-performance!