Disc Springs Maintain Clamping Stability in High-Temperature Wood Gas Filtration Systems

In wood gas-fired power generation and thermal energy systems, ceramic hot gas filtration units are used to clean dirty wood gas.

These systems operate under extremely demanding thermal and mechanical conditions, typically in the range of 500–600°C, where conventional fastening solutions often reach their limits.

In the hot gas filter, ceramic filter cartridges and ceramic seals are clamped to a base plate using a metal retainer.

Due to the different coefficients of thermal expansion, metal components expand much more than ceramic elements as temperature increases, creating relative displacement within the clamping stack. This leads to reduced clamping force, bolt relaxation, and potential loosening of the screws.

Optimum Disc springs or Belleville washers are widely used to compensate for length variations and absorb thermal expansion differences. They maintain clamping force after bolt relaxation, ensuring that the entire high-temperature clamping system retains adequate preload under extreme thermal cycling conditions.

OPTIMUM Disc Spring has been manufacturing high-temperature disc springs since 1984 using Inconel X-718, Inconel X-750, and Nimonic 90, with operating capabilities up to 700°C and 900°C for extreme high-temperature applications.

Need expert advice? Contact our engineer today for customize solutions at jc@optimum-spring.com !