Thread Content
At first, it was thought that the collapse was caused by the furnace bricks, as no analysis had been conducted. After opening the gasification furnace and checking, it was found that the bricks were in good condition. After further analysis, it was concluded that air was leaking between the bricks and the furnace walls. Due to the gaps between these walls and bricks, there was a slight pressure difference and temperature difference between the upper and lower parts of the furnace, which caused hot gases to flow through the gaps between the bricks. A large amount of heat accumulated in the outermost layer; when the temperature exceeded the maximum tolerance of the material used in the gasification furnace, combined with the high pressure inside the furnace, bulging inevitably occurred. Based on my on-site observations and analysis, there are actually two other main reasons for these bulges: during the construction of the furnace, the refractory cement was not mixed in accordance with the correct proportions. When the furnace was first built, the uneven consistency of the cement paste caused the bricks to sink and become separated from the furnace walls, preventing a proper seal and resulting in gaps and holes, which in turn laid the foundation for future problems ； Another reason is that, due to years of safe production practices, the drying process is no longer carried out in strict accordance with the operating procedures; usually, the drying is completed in just a few dozen hours. It is this irresponsible attitude that lays the groundwork for another problem. The rapid heating causes the water contained in the refractory cement to evaporate quickly, resulting in high-temperature, high-pressure steam. This steam creates numerous honeycomb-like micro-pores in the refractory cement, and when these micro-pores connect with each other, large gas channels are formed. During operation, these channels are constantly subjected to the scouring of high-temperature and high-pressure gasified gases, causing them to expand. When they reach a certain size, tragedy begins.