Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG storage tanks, oxygen/nitrogen/argon storage tanks, and CO2 storage tanks; pressure vessel products like denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; as well as central air conditioning and ventilation equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Before using the liquid oxygen tank, the following preparations must be made:
Safety Inspection: Ensure the tank and its surrounding environment are safe. Check for any damage, leaks, or other potential hazards. Confirm that there are no flammable materials or other hazardous items in the vicinity of the tank.
Tank Preparation: Inspect the tank's exterior, including the shell, welds, valves, and fittings. Ensure there are no visible damages or corrosion. Check that the insulation layer is intact and undamaged.
Liquid Oxygen Filling: Utilize liquid oxygen transfer 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: Storage tanks should be equipped with pressure control devices to ensure the internal pressure of the tank is within a safe range. Inspect and adjust the pressure control devices to ensure proper operation.
Valve Operation: Check that the valves and fittings on the tank are operating properly. Ensure the valves open and close smoothly and reliably. Adjust the valve's open and close status as needed.
Safety Equipment: Inspect the safety equipment around the storage tank, such as fire separation zones, alarm systems, etc., to ensure they are functioning properly.
Operator Training: Ensure operators are proficient in the safe operation of liquid oxygen storage tanks.

Liquid nitrogen storage tanks are widely used in meat freezing. The following are several main applications of liquid nitrogen storage tanks in meat freezing:
Quick Freezing: Liquid nitrogen tanks can provide low temperatures to rapidly freeze meat to the desired 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.
Cryogenic Storage: Liquid nitrogen tanks are suitable for long-term freezing storage of meat products. Placing meat in a liquid nitrogen tank can maintain it at low temperatures, prevent the growth of bacteria and microorganisms, and extend the shelf life of the meat.
Chilled Transportation: Liquid nitrogen tanks are suitable for the freezing transportation of meat products. Placing the meat in a liquid nitrogen tank maintains its低温 state, ensuring the quality and freshness of the meat throughout the transportation process.
Chilled Processing: Liquid nitrogen tanks are suitable for meat chilling. By exposing the meat to liquid nitrogen, the surface of the meat can be quickly frozen, forming a frozen 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.
Note that when using liquid nitrogen tanks for meat freezing, it is essential to follow the relevant safety operation procedures and guidelines. Ensure that operators are equipped with the necessary safety awareness and operational skills to prevent accidental incidents. In addition, consult the food safety authority for further information.

When storing liquid nitrogen in low-temperature storage tanks, the following points should be noted:
Protective Gear: When operating low-temperature storage tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes. This equipment can safeguard the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause chilling. Therefore, avoid direct contact with liquid nitrogen, especially with the skin. Use tools or implements for handling, to prevent direct hand contact with liquid nitrogen.
Ventilation Requirements: In the operation area of low-temperature tanks, adequate ventilation must be ensured to exhaust gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect low-temperature storage tanks for leaks and equip them with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid the hazards of liquid nitrogen leaks to personnel and the environment.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which can easily cause fires. Measures such as installing fire walls around low-temperature storage tanks and using fire-resistant coatings are taken to prevent the occurrence and spread of fires.
Static protection: The accumulation of static electricity in low-temperature tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of low-temperature storage tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks produce waste gas during operation, and appropriate waste gas treatment measures must be implemented to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature storage tank, to ensure operational safety and the normal operation of the tank. During operation, strict adherence to relevant operational procedures and safety requirements is necessary to avoid accidents.

The filling process of a low-temperature liquid nitrogen storage tank involves transferring liquid nitrogen from an external supply source into the tank. Below is an explanation of the filling process for low-temperature liquid nitrogen storage tanks:
Preparation: Prior to filling the liquid nitrogen tank, thorough preparation is required. This includes inspecting the tank's condition and safety, ensuring the interior is clean, free of impurities and contaminants. Additionally, verify the quality of the liquid nitrogen from the supply source and the safety of the supply pipeline.
Connect supply source: Link the liquid nitrogen supply source to the liquid inlet of the storage tank. Ensure the connection is tight and secure to prevent leaks.
Control Liquid Level: During the bottling process, it is necessary to control the liquid nitrogen level to prevent overfilling or overflow. A liquid level gauge or a liquid level control system can be used to monitor and control the level.
Slow injection: The injection of liquid nitrogen should be slow to prevent rapid vaporization and pressure increase. Appropriate valves and flow control devices can be used to regulate the injection speed.
Monitor Pressure: During the canning process, it is necessary to monitor the tank's pressure to ensure it remains within the safe range. Pressure gauges or pressure sensors and similar equipment can be used for monitoring.
Canning Complete: Stop injecting liquid nitrogen when the liquid level reaches the predetermined filling amount or the tank's capacity limit. Disconnect the connection to the supply source and ensure the sealing of the filling port.
Safety Operation: Throughout the bottling process, relevant safety regulations and operation guidelines must be followed. Liquid nitrogen is highly flammable at low temperatures; operators should wear appropriate personal protective equipment and ensure the operation environment is free of any ignition sources.
When bottling liquid nitrogen, attention must be given to its low-temperature properties and safety. Ensure safe operation and control during the bottling process to guarantee the safe operation of the storage tank and the effective storage of liquid nitrogen.
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