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 Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area 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 named a "Specialized and New Enterprise in Shandong Province" by the Department of Industry and Information Technology. In June 2022, it was identified as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was recognized as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Carbon dioxide tanks are devices used for storing carbon dioxide gas. They are typically made of high-strength materials with sealing capabilities to prevent the leakage of stored CO2. The design and capacity of the tanks can be adjusted as needed to accommodate various applications. Carbon dioxide tanks are widely used across industries, including industrial production, food processing, and more. In the industrial sector, they are commonly used to store and supply CO2 gas for welding, gas shielding, fire suppression, and other processes. In the food processing industry, they can be used to produce carbonated beverages and frozen foods. In the medical field, carbon dioxide tanks can be used to manufacture medical gases like breathing gases and anesthetic gases. The development and manufacturing of carbon dioxide tanks involve multiple manufacturers and technologies. Different companies may use various designs and manufacturing processes to meet the diverse needs of users. Additionally, safety standards and regulations must be adhered to ensure the safe operation and use of the tanks.

Construction features of carbon dioxide storage tanks mainly include the following aspects: Material selection: Carbon dioxide storage tanks are typically made of carbon steel or stainless steel to ensure their corrosion resistance and pressure-bearing performance. Welding technology: The welding technology of the tank is crucial for its quality and safety. The welding process should comply with relevant standards and specifications to ensure the quality and strength of the welds. Corrosion prevention measures: Due to the corrosive nature of carbon dioxide, both the internal and external surfaces of the tank should be treated for corrosion prevention. Common corrosion prevention measures include applying anti-corrosion paint, coating with a corrosion-resistant layer, or using anti-corrosion coatings. Safety valves and pressure sensors: The tank should be equipped with safety valves and pressure sensors for monitoring and controlling the internal pressure of the tank to ensure safe operation. Steps for correctly installing a carbon dioxide storage tank are as follows: Site preparation: Select an appropriate site for installation, ensuring the site is level, stable, and meets safety distance requirements. Clear the site to ensure there are no obstructions or fire sources. Foundation construction: Construct the foundation based on the size and weight of the tank. The foundation should have sufficient strength and stability to support the weight and pressure of the tank. Tank installation: Place the tank on the foundation, ensuring there is appropriate padding and fastening devices between the tank and the foundation. Connect and secure the tank according to its design requirements. Pipe connection: Connect the tank to the piping system as needed. Ensure the connections are sealed properly to prevent leaks. Safety equipment installation: Install the required safety equipment for the tank, such as safety valves, pressure sensors, temperature sensors, etc. Ensure these facilities are properly installed and connected.

The inspection frequency of carbon dioxide storage tanks should be determined based on local regulations, standards, and manufacturer recommendations. Generally, several factors can influence the inspection frequency of carbon dioxide storage tanks: - Regulatory and Standard Requirements: Different regions may have varying regulations and standards that specify the inspection requirements and frequency for tanks. For instance, the U.S. DOT standards require liquid gas tanks to undergo external inspections every 5 years and internal inspections every 10 years. - Manufacturer Recommendations: Manufacturers typically provide recommendations for inspection frequency, which are based on tank design, materials, and service life, and can serve as a reference for developing an inspection plan. - Usage Environment and Conditions: The storage tank's usage environment and conditions also impact the inspection frequency. For example, if a tank is exposed to corrosive environments or frequently subjected to mechanical stress, more frequent inspections may be necessary. - Generally, external inspections of liquefied gas tanks are conducted through visual inspections, ultrasonic testing, magnetic particle testing, and other methods to assess the tank's external condition and potential defects. Internal inspections may require emptying the tank and using methods like internal inspection, thickness measurement, and weld testing to evaluate the internal condition. - It is crucial that inspections are performed by trained and experienced personnel and are conducted strictly in accordance with relevant regulations, standards, and manufacturer recommendations. Regular inspections and maintenance ensure the tank's safety and reliability, reducing the risk of accidents.

The primary reason for pre-cooling a carbon dioxide tank before use is to ensure that the carbon dioxide inside remains in a liquid state and maintains a stable temperature during storage and supply. The pre-cooling process typically involves several steps: Tank Cooling: Before the tank is put into service, the internal temperature of the tank must be cooled to a sufficiently low level to convert the carbon dioxide from a gas to a liquid. This can be achieved by injecting a cooling medium (such as liquid nitrogen) into the tank or by using an external cooling unit. Tank Pre-charging: After the tank has been cooled, liquid carbon dioxide is pre-charged into the tank to fill it and maintain a certain pressure. The purpose of pre-charging is to provide an adequate supply of carbon dioxide during storage and supply, and to maintain stable pressure within the tank. By pre-cooling, the liquid state of carbon dioxide inside the tank can be ensured, avoiding premature evaporation and energy loss. Additionally, pre-cooling helps to lower the tank's temperature in advance, reducing carbon dioxide evaporation and pressure fluctuations, thereby improving the tank's operational efficiency and safety. It is important to note that the specific methods and requirements for pre-cooling may vary depending on the tank design and application. When conducting pre-cooling operations, it is necessary to follow relevant safety operation procedures and standards to ensure the safety and effectiveness of the operation.
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