A Study Of Pyrophoric Nature Of Ferrous Sulfide

The condition of inspection and maintance of petrochemical units was simulated by Accelerating Rate Calorimeter to investigate the oxidation reactions and spontaneous combustion behavior of ferrous sulfide in this paper. The effects of flow rate of air ,particle sizes of ferroussulfide and the existence of water on the reactions were studied as well. meanwhile, the kinetic parameter were calculated with dynamic model. The main work of this paper as following:1.The self-ignition temperature of ferrous sulfide decreased gradually with finer of ferrous sulfide particles, and the temperature of the maximum temperature rise rate stepped down obviously . the surface area of ferrous sulfide enlarged with the granularity of ferrous sulfide decreased, it was easily to diffuse for the air on ferrous sulfide , The rate of reaction was increased when the particle sizes of ferrous sulfide were smaller. As a result ,the risk of pyrophoric tends to became greater .â’‰Water played an important role in self-ignition of ferrous sulfide. the study showed that the water as required could decreased the initialization self-ignition temperature greatly, but the abundant water could blocked the oxidation of ferrous sulfide. In addition the probably reaction of ferrous sulfide with water have been performed in the air and nitrogen, it was observed that the reaction of ferrous sulfide with water could taken place in nitrogen.â’ŠPyrophoric nature tends of ferrous sulfide became greater with the temperature of saturated vapor increased. This is explained by greater relative humidity to proceed.â’‹The spontaneous combustion of ferrous sulfide was enhanced by greater flow air rate. This may be due to the increase probability of contact between oxygen molecules and ferrous sulfide. When the speed of reaction was faster,...