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 seven business centers: boilers, deep-freezing containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It operates three factory sites on 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. The company currently employs 710 staff, including 247 engineers and technicians and 82 intermediate-level technicians. 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: 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 quick-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 transforming into a liquid state, thereby ensuring an 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 caking 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: 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 effects.
Environmental Protection and Energy Saving: Liquid nitrogen rapid freezing technology is more energy and resource-efficient compared to traditional freezing methods. Liquid nitrogen evaporates quickly during the freezing process, causing environmental pollution and generating waste water and gas.
Note that when using liquid nitrogen storage tanks for rapid freezing, it is crucial to follow the relevant safety operation procedures and guidelines. Ensure that the operators have the necessary safety awareness and operating skills to prevent any accidents. Additionally, consult

The normal pressure range for liquid oxygen tanks typically falls between 2-5 bar. This range refers to the oxygen pressure inside the tank, which is necessary to maintain the liquid oxygen in its liquid state. The design and manufacture of liquid oxygen tanks should comply with relevant standards and regulations to ensure the tank can safely withstand this pressure range under normal operating conditions. It is important to note that the pressure of liquid oxygen tanks can be affected by various factors, such as the temperature of the liquid oxygen, the tank's design, and materials. In actual use, the normal pressure range of the tank should be determined based on specific tank design and usage requirements, and operations and maintenance should follow relevant regulations and standards. Additionally, liquid oxygen tanks should be equipped with pressure control devices, such as pressure valves or pressure relief devices, to ensure the internal pressure of the tank remains within a safe range. These devices can automatically release gas when the pressure exceeds the set value, ensuring the safety of the tank. Regular inspection and maintenance of these pressure control devices should be conducted when using liquid oxygen tanks to ensure their proper functioning.

A water pressure test for liquid nitrogen tanks is a common method used to check the tank's sealing and pressure resistance. Below are the general steps for a water pressure test on a liquid nitrogen tank:
Preparation: Ensure the tank's interior is clean and that all gases and liquids have been evacuated from the tank. Check that the tank's seals and safety devices are functioning properly.
Fill water: Fill the internal space of the tank with water, ensuring the water level is above the low water line. Pump or other appropriate methods can be used for filling.
Apply Pressure: Use a pressure pump or other pressure source to gradually increase the water pressure until it reaches the predetermined test pressure. The test pressure is typically 1.1 times the design working pressure of the tank.
Pressure Maintenance: After reaching the test pressure, maintain it for a period (usually 30 minutes to 1 hour), and observe for any abnormal conditions such as leaks or deformation in the tank.
Pressure Release: Gradually release pressure to drain water from the tank until the tank is completely empty.
Inspection and Evaluation: Check the tank's surface and interior for leaks, deformation, or other damage. Evaluate the test results to ensure the tank meets design requirements and safety standards.
需要注意的是，液氮储罐水压试验需要由人员进行操作，并遵循相关的安全操作规程。在进行测试前，应仔细阅读和遵守储罐制造商提供的操作指南和安全注意事项。

Safety operation and transportation of liquid oxygen storage tanks should be mindful of the following points:
Safety Usage Instructions:
Tank Selection: Choose liquid oxygen tanks that comply with regulations and standards, ensuring their quality and safety performance.
Tank Installation: Tanks should be installed on a solid foundation to ensure stability. Additionally, good ventilation should be maintained around the tank, and it should be kept away from flammable materials and heat sources.
Sealability Inspection: Regularly inspect the tank's sealing performance to ensure there are no leaks at valve and pipe connections.
Pressure Control: Tanks should be equipped with pressure gauges and safety valves, and undergo regular inspections and maintenance to ensure pressure remains within safe limits.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content and is highly flammable. Establish fire barriers around the storage tanks, prohibit smoking and open flames, and ensure safety.
Electrostatic Protection: During the transportation and use of liquid oxygen, static electricity can cause sparks, increasing the risk of fire. Measures such as using electroconductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Shipping Precautions:
Transportation Vehicle Selection: Choose transportation vehicles that meet the requirements for liquid oxygen transport, ensuring their safety and sealing integrity.
Loading and Unloading: During the transportation of liquid oxygen, appropriate loading and unloading procedures should be adopted.
Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, with testing facilities for non-destructive testing, physical and chemical tests, welding tests, hydrostatic tests, etc. We are equipped with 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 we have developed, such as thermal pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been included in multiple Shandong Provincial Department of Industry and Information Technology scientific and technological innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li of Shandong University, has developed deep cryogenic vessel processing technology using the international plasma arc + filler wire tungsten inert gas (PAW-GTAW) welding technology. This technology has been appraised as reaching international standards in the field of deep cryogenic vessel manufacturing at the provincial level. Choose Zhongjie Special Equipment, let's create brilliance together!