Main Material of the Damping Tank

Main Material of the Damping Tank

The main material of the damping tank is identical to that of the steam drum in batch-type waste tire pyrolysis equipment, following the core principles of high temperature resistance, mild corrosion resistance, thermal fatigue resistance and adaptation to micro-positive pressure conditions. Internal components such as the inlet anti-impact plate/diversion cylinder are made of the same material as the tank body with no separate material selection. Three mainstream material types are available for different process conditions, all being special pressure vessel steel conforming to GB150 standards, as detailed below:

Q345R Boiler and Pressure Vessel Steel Plate: The most universal and mainstream option, suitable for the vast majority of conventional working conditions. It withstands the high temperature of 250-350℃ of pyrolysis oil and gas, resists mild sulfide corrosion, and features excellent toughness and thermal fatigue resistance to adapt to the frequent temperature fluctuations of batch processes. Meanwhile, it can withstand mild scouring by oil and gas, balancing structural strength and economic efficiency, and is the industry first choice.

Q245R Boiler and Pressure Vessel Steel Plate: An cost-effective alternative, suitable for pyrolysis processes with long-term constant temperature and low-sulfur raw materials. Its basic performance in high temperature/pressure and corrosion resistance meets operational requirements with a slightly lower cost than Q345R, and it can be adopted when there are no severe working condition fluctuations.

304/316 Stainless Steel: A dedicated option for high-corrosion working conditions, applicable to scenarios involving high-sulfur waste tires and high acid content in oil and gas. 316 stainless steel has better corrosion resistance than 304, which can effectively resist long-term corrosion from high-concentration sulfides and acidic media in pyrolysis oil and gas to prevent wall thinning of the tank body. With superior impact resistance, stainless steel plates can be slightly thinner than carbon steel.

Supplementary Material Selection Details

Plate Thickness: Carbon steel (Q345R/Q245R) is generally 8-12mm, and stainless steel is 6-10mm. The specific thickness is determined based on the tank volume and system micro-positive pressure (0-5kPa absolute pressure) to meet pressure-bearing and load-bearing requirements.

Welding Requirements: Welded joints use the same material as the tank body. For stainless steel materials, passivation treatment is required after welding to prevent intergranular corrosion.

Anti-Corrosion Matching: For carbon steel tank bodies under slightly more corrosive working conditions, the inner wall can be coated with epoxy resin or polytetrafluoroethylene anti-corrosion coatings to enhance corrosion resistance.