Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic and Technological 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: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory areas on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters. The main workshop is 83,000 square meters. There are currently 710 employees, including 247 engineering and technical personnel 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, it was identified 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 low, approximately -196 degrees Celsius. Using a liquid nitrogen tank for quick 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 flash-freezing technology achieves rapid and even freezing of food. Liquid nitrogen is喷射ed onto the food surface in a gaseous form, rapidly absorbing heat and converting to a liquid state, thereby ensuring even freezing of the food and avoiding crystallization and lumps 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 tiny freezing structures, effectively retaining the food's moisture and nutritional content.
Flexibility and Adaptability: Liquid nitrogen tanks can be adjusted and controlled according to different types of food and freezing requirements. The injection speed and angle of liquid nitrogen can be adjusted 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.
Be mindful that when using liquid nitrogen tanks for rapid freezing, it is crucial to adhere to 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

Several factors need to be considered when determining the design pressure and calculated pressure for a liquid oxygen storage tank:
Design Pressure: Design pressure refers to the maximum pressure a tank can withstand under normal operating conditions. When determining the design pressure, factors such as the working pressure range of liquid oxygen, the material strength of the tank, and safety factors need to be considered. Generally, the design pressure should be slightly higher than the high working pressure of liquid oxygen to ensure the tank's safety and reliability within the normal operating range.
Calculation Pressure: The calculation pressure refers to the actual operating pressure of the tank under the design pressure. It is determined through calculations based on factors such as the properties of liquid oxygen, the geometric shape of the tank, and its material strength. The calculation pressure should take into account factors like the expansion coefficient of liquid oxygen, temperature variations, and pressure fluctuations to ensure the safety and stability of the tank under actual operating conditions.
To determine the design pressure and calculated pressure of liquid oxygen storage tanks, it is typically necessary to refer to relevant standards and specifications, such as Standard GB150 "Steel Pressure Vessels" and GB18442 "Technical Conditions for Storage Tanks of Liquid Oxygen, Liquid Nitrogen, and Liquid Argon." These standards and specifications provide detailed design and calculation methods to ensure the safety and reliability of the tanks.
In practical application, the design pressure and calculated pressure of liquid oxygen storage tanks should be calculated and determined by pressure vessel designers. They will take comprehensive considerations based on specific engineering requirements, tank dimensions, materials, and other factors to ensure that the tank's design and use comply with relevant safety standards and regulations.

Liquid Oxygen Tanks are devices designed for storing liquid oxygen. Liquid oxygen is obtained by cooling oxygen below its boiling point and is commonly used in various fields such as equipment, industrial production, and devices. These tanks are typically made of high-strength materials like stainless steel to withstand the low temperatures and high pressures of liquid oxygen. They usually have an insulating layer inside to minimize evaporation of the liquid oxygen and maintain its低温 state. The design and manufacturing of liquid oxygen tanks must prioritize safety and reliability to prevent leaks and explosions. Strict operational procedures and safety standards must be followed when using liquid oxygen tanks to ensure the safety of personnel and equipment. The development and manufacturing of liquid oxygen tanks are handled by engineers and technical teams, involving knowledge and technology from various fields such as materials science, mechanical engineering, and chemical engineering. Different manufacturers may employ different design and manufacturing methods to meet the diverse needs and application scenarios of users.

Maintenance and upkeep are crucial for ensuring the safety of low-temperature storage tanks. Here are some common maintenance measures:
Regular Inspections: Conduct regular inspections of low-temperature storage tanks, including checks of the exterior, internal structure, and anti-corrosion coatings. Look for cracks, corrosion, wear, and other issues, and address potential safety hazards promptly.
Cleaning and De-icing: Regularly clean the exterior and internal structure of low-temperature storage tanks to remove accumulated dirt and ice layers. The buildup of ice can lead to structural damage and corrosion, and proper cleaning and de-icing can extend the lifespan of the tank.
Level Monitoring: Regularly monitor the liquid level in low-temperature storage tanks to ensure it remains within the safe range. Excessive or insufficient levels can lead to overpressure or over-vacuum in the tank, increasing safety risks.
Leak Detection: Install a leak detection system to regularly check for leaks in low-temperature storage tanks. Leaks can lead to the release and evaporation of liquids or gases, increasing safety risks.
Corrosion Protection Measures: Implement appropriate corrosion protection measures, such as coating protection and corrosion-resistant coatings, to safeguard the metallic structure of low-temperature storage tanks from corrosion damage.
Emergency Fault Handling: Establish an emergency fault handling system to promptly address and repair issues with low-temperature storage tanks, preventing accidents and their escalation.
Training and Development of Personnel: Train and develop operation and maintenance personnel to ensure they possess the relevant knowledge and skills for proper operation and maintenance of low-temperature storage tanks.
Be mindful that maintenance and care should be tailored to the specific type of tank and operating conditions, adhering to relevant local laws, regulations, and standards. During maintenance, it's advisable to consult with engineers or guidance from relevant agencies to ensure the tank's safety and reliability.
Zhongjie Special Equipment upholds the grand vision of "realizing employees' dreams, creating customer value, and striving for the prosperity and strength of our motherland," and is dedicated to the development of the green energy equipment industry. We offer society high-value products and services!