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: 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, with the main workshop spanning 83,000 square meters. It 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, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Prior to using the liquid oxygen tank, the following preparations must be made:
Safety Inspection: Ensure the tank and its surrounding environment are secure. Check for any damage, leaks, or other safety hazards in the tank. Confirm that there are no flammable substances or other hazardous materials nearby.
Tank Preparation: Inspect the tank's exterior, including the shell, welds, valves, and fasteners. Ensure there is no visible damage or corrosion. Check that the insulation layer is intact and undamaged.
Liquid Oxygen Filling: Utilize liquid oxygen delivery equipment to fill the tank with liquid oxygen. Ensure that the flow rate and pressure of the liquid oxygen are maintained within safe limits during the filling process.
Pressure Control: Tanks should be equipped with pressure control devices to ensure internal pressure is within a safe range. Inspect and adjust the pressure control devices to ensure proper operation.
Valve Operation: Check that the valves and connections on the tank are functioning properly. Ensure the valves open and close smoothly and reliably. Adjust the opening and closing status of the valves as needed.
Safety Equipment: Inspect the safety equipment around the storage tank, such as fire isolation zones and alarm systems, to ensure they are functioning properly.
Operator Training: Ensure operators are proficient in the safe operation of liquid oxygen storage tanks.

The liquid oxygen tank possesses the following characteristics:
High Purity: The liquid oxygen storage tank contains high-purity liquid oxygen, typically exceeding 99.5% purity. This makes the liquid oxygen storage tank crucial in applications requiring high-purity oxygen, such as medical, industrial, and research fields.
Low Temperature: Liquid oxygen has a boiling point of -183°C, thus the liquid oxygen storage tank must have excellent insulation properties to maintain the low temperature state of the liquid oxygen. Tanks typically feature a double or multi-layer structure with insulation material filled in between to minimize heat transfer and evaporation of the liquid oxygen.
High Pressure: Liquid oxygen tanks typically need to withstand high pressure to maintain their liquid state. The design and material selection of the tank must consider the pressure requirements of liquid oxygen to ensure the tank's safety and reliability.
Flammability: Liquid oxygen is highly flammable and supports combustion. Therefore, during the design and operation of liquid oxygen storage tanks, fire prevention measures must be implemented to ensure there are no ignition sources around the tank and that appropriate fire extinguishing equipment is available.
High Density: Liquid oxygen has a higher density than gaseous oxygen, allowing liquid oxygen tanks to store more oxygen. This gives liquid oxygen tanks an advantage in applications requiring large oxygen supplies, such as in the field.
Corrosiveness: Liquid oxygen possesses some degree of corrosiveness.

To prevent dangers associated with liquid oxygen tanks, the following precautions can be taken:
Safety Operations and Management: Establish and enforce stringent safety operations and management systems, including proper use of storage tanks, operational procedures, and safety training. Ensure operators possess the necessary safety awareness and skills, adhere to operational procedures, and minimize operational errors and the likelihood of accidents.
Regular inspections and maintenance: Conduct regular checks and maintenance on liquid oxygen tanks, including visual inspections, pressure tests, and leak detection. Identify and address tank issues promptly to ensure safety and reliability.
Safety devices and protective equipment: Tanks should be equipped with necessary safety devices, such as pressure relief valves, level alarms, etc., as well as protective equipment, like firewalls, explosion-proof devices, etc. These devices and equipment can take timely measures in abnormal situations to ensure the safety of the tank.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content, which is prone to causing fires. Therefore, fire prevention measures such as firewalls and fire extinguishers should be set up around the storage tanks to prevent the spread and enlargement of fires.
Leakage Control and Emergency Response Plan: Establish a liquid oxygen tank leakage control and emergency response plan, including leakage control measures, emergency response procedures, and evacuation plans. In the event of a leakage incident, the plan enables prompt action to control the leak and ensure personnel safety.
Training and Awareness Enhancement: Conduct regular safety training for personnel operating liquid oxygen tanks to enhance their safety awareness and emergency response capabilities. Strengthen safety

Liquid nitrogen tanks are widely used in meat freezing. Here are several main applications of liquid nitrogen tanks in meat freezing:
Quick Freezing: Liquid nitrogen tanks can provide low temperatures to rapidly freeze meat to the required temperature. Due to the low-temperature properties of liquid nitrogen, meat temperatures can be quickly reduced in a short period, effectively preserving the quality and texture of the meat.
Chilled Storage: Liquid nitrogen tanks are suitable for long-term storage of meat products. Placing meat in a liquid nitrogen tank can maintain it at low temperatures, preventing the growth of bacteria and microorganisms, and extending the shelf life of the meat.
Chilled Transport: Liquid nitrogen tanks can be used for the frozen transportation of meat products. Placing meat in the liquid nitrogen tank maintains its low temperature, ensuring the quality and freshness of the meat during transit.
Chilling Processing: Liquid nitrogen tanks can be used for meat chilling. By exposing meat to liquid nitrogen, the surface can be quickly frozen, forming a frost layer, thereby preserving the meat's moisture and nutritional content.
Chilled Processing: Liquid nitrogen tanks are suitable for meat freezing processing. Placing meat in liquid nitrogen makes it harder and crisper, facilitating cutting, slicing, and processing.
Be mindful that when using liquid nitrogen tanks for meat freezing, it is essential to adhere to 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 with food safety experts.
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 commit to society with high-quality, cost-effective products and services!