A spherical kettle, also known as a reaction kettle, is a device widely used in the chemical, pharmaceutical, dye, petroleum, and food industries for processes such as mixing, reaction, heating, cooling, etc. of heterogeneous substances. As the core part of the ball kettle, the choice of material is very important for the performance, durability and applicability of the ball kettle.
1. Common materials
The materials of the ball kettle liner usually include the following:
1. Stainless steel
Stainless steel is the most commonly used material for ball kettle liners, especially 304 and 316L stainless steel. 304 stainless steel has good corrosion resistance and cost-effectiveness, and is suitable for the treatment of most non-highly corrosive substances. 316L stainless steel is better than 304 in corrosion resistance and contains more nickel and molybdenum for harsher chemical environments.
2. Carbon steel
Carbon steel liners have a lower cost, higher strength and good thermal conductivity, but poor corrosion resistance and are generally used in applications that do not involve corrosive substances.
3. Hastelloy
Hastelloy is a high-temperature and corrosion-resistant nickel-based alloy suitable for reaction conditions containing corrosive gases, high-temperature environments, and corrosive media.
4. Titanium and titanium alloys
Titanium is light and extremely corrosion-resistant, making it suitable for handling highly corrosive media such as seawater, chloride and sulfuric acid.
5. Plastic and glass lining
For some highly corrosive liquids, the liner may be lined with plastic (e.g., PTFE) or glass. These grades have excellent chemical stability and non-adhesion, but are generally lower than metal materials in terms of mechanical strength and thermal stability.
Second, the basis for material selection
The choice of liner material is based on the following factors:
1. Chemical stability
The material should have good corrosion resistance to reactants and products to avoid contamination or corrosion of the liner during the reaction process.
2. Thermal stability
The material should be able to withstand the required operating temperature range without deformation or damage.
3. Mechanical strength
According to the pressure in the ball kettle, the material of the inner tank should have enough mechanical strength to prevent ** or deformation.
4. Cost
The quality of the material is also a consideration, especially in large-scale production.
3. Maintenance and use
For the maintenance and use of the ball kettle liner, the following points need to be noted:
1. Regular inspection
Inspect the inner tank of the ball kettle regularly to ensure that there is no corrosion or wear.
2. Cleaning
After the reaction is completed, the inner tank should be cleaned in time to avoid long-term corrosion of residual substances.
3. Temperature and pressure control
Strictly operate the temperature and pressure in accordance with the regulations, and avoid overheating or excessive pressure on the inner tank.
Summary:
The material of the inner tank of the ball kettle needs to be considered according to the nature of the reactive substance, the reaction conditions and the cost-effectiveness. Stainless steel, carbon steel, Hastelloy, titanium and titanium alloys, as well as plastic and glass linings are common options. The correct choice of liner material is essential to ensure that the reaction process is safe, efficient and economical. At the same time, good maintenance and rational use can prolong the service life of the ball kettle liner and ensure the smooth production process.