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 operates seven business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters. The main workshop spans 83,000 square meters. Currently, the company has 710 employees, including 247 engineers and technicians, and 82 intermediate-level technical personnel. In December 2016, it was recognized as a "High-Tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The use of liquid nitrogen storage tanks in rapid freezing technology offers several advantages:
Rapid Freezing Speed: The temperature of liquid nitrogen is extremely low, approximately -196 degrees Celsius. Using a liquid nitrogen tank for rapid freezing can quickly lower the surface temperature of food, achieving rapid 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 rapid and even freezing of food. Liquid nitrogen is喷射ed onto the food surface in a gaseous form, quickly absorbing heat and turning into a liquid, thereby ensuring even freezing of the food and preventing crystallization and lumping during the freezing process.
Maintain Food Quality: Liquid nitrogen rapid freezing 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 minute freezing structures, effectively retaining the food's moisture and nutritional content.
Flexibility and Adaptability: Liquid nitrogen tanks can be adjusted and controlled to cater to various food types and freezing requirements. The flow rate and angle of liquid nitrogen喷射 can be modified based on the size, shape, and freezing needs of the food to achieve optimal freezing results.
Environmental protection and energy-saving: Liquid nitrogen rapid freezing technology can save more energy and resources compared to traditional freezing methods. Liquid nitrogen evaporates rapidly during the freezing process, causing environmental pollution and generating waste water and gas.
It should be noted that when using liquid nitrogen tanks for rapid freezing, it is crucial to follow the relevant safety operating procedures and guidelines. Ensure that operators are equipped with the necessary safety awareness and operational skills to prevent accidents. Additionally, consult

Low-temperature liquid oxygen storage tanks typically require some safety accessories to ensure safe operation and to address potential risks. The following 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 triggers alarms or automatically stops filling measures to prevent over-pressurization of the tank.
Safety valve: Used to automatically release gas when the pressure inside the 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 to 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 liquid oxygen level changes inside storage tanks, ensuring sufficient liquid oxygen levels and preventing overfilling.
Temperature Sensor: Used to monitor temperature changes within storage tanks to ensure the temperature of liquid oxygen inside remains within a safe range.
Fire Detectors and Fire Suppression Systems: Used to monitor fire risks around storage tanks and activate the fire suppression system as needed, to prevent the spread of fire to the surrounding area.

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: Select the appropriate welding process and parameters to minimize welding heat input and thermal stress. Utilize low heat input welding methods such as pulsed welding and laser welding to reduce the temperature gradient and residual stress in the焊接 heat affected zone.
Preheating and Post-Weld Heat Treatment: Perform an appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct a suitable post-weld heat treatment, such as annealing or stress-relief heat treatment, to minimize residual stresses and improve the toughness of the weld joint.
Select appropriate welding materials: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select the appropriate welding material 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 the welding process 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, reducing the accumulation of thermal and residual stresses.
Inspection and Evaluation: After welding, conduct non-destructive tests on the welds, such as ultrasonic testing, X-ray testing, etc., to assess the quality of the weld and the presence of cracks. Detect and repair weld cracks promptly 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 materials, welding techniques, and operations. When welding low-temperature liquid storage tanks, it is advisable to consult with a welding engineer or relevant institutions for guidance to ensure welding quality and the safety of the tank.

Liquefied nitrogen tanks feature the following characteristics during the construction process:
Low Temperature Construction: Construction of liquid nitrogen tanks must be carried out in low-temperature environments, as the boiling point of liquid nitrogen is low, approximately -196 degrees Celsius. Workers must take appropriate protective measures, such as wearing insulated clothing and gloves, to protect themselves from低温 injuries.
Welding Technology: Extensive welding is required during the manufacturing process of liquid nitrogen storage tanks, including the connection of tank panels, bottom plates, top plates, and weld seams. Welding technology is crucial for the quality and safety of the tank, necessitating the use of appropriate welding methods and materials to ensure the strength and sealability of the welds.
Insulation Layer Construction: Liquid nitrogen tanks must have excellent insulation properties to minimize heat transfer and maintain the low temperature state of the liquid nitrogen. The construction of the insulation layer requires materials such as polyester foam, glass wool, etc., to ensure the thickness and quality of the insulation layer.
Proper installation steps for a liquid nitrogen tank are as follows:
Site Preparation: Select a suitable site for tank installation, ensuring it is level, sturdy, and has adequate load-bearing capacity. The site should be located away from flammable, explosive materials, and other hazards.
Foundation Construction: Construction of the foundation based on the tank's dimensions and weight, including excavation of the foundation pit and pouring of concrete foundation. The design and construction of the foundation must comply with relevant standards and regulations.
Tank Installation: Transport the tank to the site and perform vertical installation. Appropriate lifting equipment and safety measures must be used during the installation process to ensure 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 performed during the connection process to ensure the safety of the pipes.
ZJ Special Equipment adheres to 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 products and services with high cost-performance to contribute to society!