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-freezing containers, pressure vessels, central air conditioning, engineering installation, international trade, and the 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 people, 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.
Liquid nitrogen tanks are widely used in meat freezing. The following 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, the temperature of the meat can be quickly reduced in a short period of time, effectively preserving the quality and texture of the meat.
Cold Storage: Liquid nitrogen tanks are suitable for long-term frozen storage of meat products. Placing the meat in a liquid nitrogen tank maintains it at low temperatures, preventing the growth of bacteria and microorganisms, and extending the shelf life of the meat.
Chilled Transport: Liquid nitrogen tanks are suitable for the cold transportation of meat products. Placing meat in the liquid nitrogen tank can maintain its low temperature, ensuring the quality and freshness of the meat throughout transportation.
Chilled 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 more brittle, 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.

Liquid 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 due to the low boiling point of liquid nitrogen, approximately -196 degrees Celsius. Construction personnel must take appropriate protective measures, such as wearing insulated clothing and gloves, to protect themselves from low-temperature injury.
Welding Technology: A substantial amount of welding is required during the manufacturing process of liquid nitrogen tanks, including the connections of the tank walls, bottom plate, top plate, and 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 Installation: Liquid nitrogen tanks must have excellent insulation properties to minimize heat conduction and retain低温 conditions. The installation of the insulation layer requires materials such as polyester foam and glass wool, ensuring the thickness and quality of the insulation layer.
Proper installation steps for a liquid nitrogen tank are as follows:
Site Preparation: Select a suitable location for tank installation, ensuring the site is level, solid, and capable of sufficient load-bearing capacity. The site should be kept away from flammable, explosive materials, and other hazardous sources.
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 should comply with relevant standards and specifications.
Tank Installation: Transport the tank to the site and install it vertically. Appropriate lifting equipment and safety measures must be used during installation to ensure the stability and safety of the tank.
Pipe Connection: 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.

The medical oxygen steel cylinder filling area, in addition to the liquid oxygen storage tank, includes the following components:
Oxygen Compressor: Oxygen compressors are used to compress gaseous oxygen into high-pressure oxygen. These compressors are typically made with special materials and designs to ensure safe handling and compression of oxygen.
Oxygen Purification System: The oxygen purification system is designed to remove impurities and contaminants from oxygen, ensuring the purity and quality of the supplied oxygen. The system typically includes filters, absorbents, and molecular sieves.
Oxygen Storage System: In addition to liquid oxygen tanks, the oxygen filling area may also include a gaseous oxygen storage system for temporary storage and supply of gaseous oxygen. The gaseous oxygen storage system typically includes high-pressure oxygen cylinders or gas storage tanks.
Filling Equipment: Filling equipment is used to transfer oxygen from liquid oxygen storage tanks or gaseous oxygen storage systems into medical oxygen steel cylinders. The filling equipment typically includes a filling machine, filling pipelines, and a filling control system.
Oxygen Quality Monitoring System: The oxygen quality monitoring system is used to monitor the quality and purity of oxygen being filled. Quality testing and surveillance of the filled oxygen are conducted through an oxygen analyzer or other detection equipment.
Safety Facilities: The filling area should be equipped with corresponding safety facilities, such as fire alarm systems, oxygen leak detection systems, ventilation systems, etc., to ensure the safety and protective measures of the filling process.
It is important to note that the design and equipment configuration of the medical oxygen cylinder filling area must comply with relevant regulations, standards, and specifications. During the filling process, strict adherence to operational procedures and safety requirements is essential to ensure the safe supply of oxygen.

Nitrogen purge in liquid nitrogen tanks refers to the injection of nitrogen gas into the tank to increase the nitrogen concentration and pressure inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when performing nitrogen purge in liquid nitrogen tanks:
Safety Operation: Prior to performing nitrogen flushing on a liquid nitrogen tank, it is mandatory that the operator has relevant safety knowledge and operational skills. The operator should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: High purity nitrogen is used for inerting operations to ensure the quality and purity of the nitrogen. Nitrogen with low purity may contain impurities or oxygen, which could adversely affect the liquid nitrogen within the tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the speed of nitrogen injection should be controlled to avoid being too fast or too slow. Too fast nitrogen injection speed may lead to excessive internal pressure in the tank, while too slow speed may result in extended inerting time.
Pressure Monitoring: During the nitrogen filling process, the internal pressure of the tank should be regularly monitored. Ensure the internal pressure of the tank is within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, attention should be given to controlling the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and dew on the storage tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew.
Post-nitrogen flushing treatment: After the nitrogen flushing operation is completed, the flushing unit should be promptly turned off, and the tank should be inspected and cleaned. Ensure that there is no residual nitrogen or impurities inside the tank.
It is important to note that nitrogen charging for liquid nitrogen tanks must strictly adhere to the relevant safety standards.
Zhongjie 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," focusing solely on the development of green energy equipment. We dedicate high-value products and services to society!