Study On Fire Risk Of Spandex Spinning Workshop Under The Dry Spinning Process

Dimethylacetamide (DMAC) solvent was used in the process of spinning spandex production, the DMAC solvent was easily decomposed at high temperatures, resulting in fire and explosion accidents, the DMAC solvent has great risk of fire. So, it is very necessary to carry out analysis, evaluation, simulation and safety control research of the system.First of all, the decomposition of DMAC was studied by micro-calorimeter (C80),and thermodynamic parameters were calculated, the onset temperature was105℃, the activation energy was178.1kJ/mol, the pre-exponential factor was2.8×1018; the SADT was calculated according to the Semenov model, and its value was93.7℃. Using these parameters to analyse its thermal decomposition, the results show that the thermal stability was poor.Then, the heat release of DMAC was measured, which was based on the method of the mass loss rate. The heat release rate of DMAC was2268kW, which was obtained by experimental results and related formulas.Finally, the fire simulation software FDS was chosen to carry on numerical simulation of the spandex spinning workshop. Temperature、fire spread speed and CO concentration distribution of the fire workshop was got by simulation. The inhibition effect of smoke machine with different power and water spray with different flow rate was researched. The simulation results show that water spray can reduce temperature of workshop, but almost has no effect in control of the flue gas, however, smoke machine has a better protective effect on the fire risk of workshop, and it can reduce the gas concentration、temperature and CO concentration. The best smoke machine power was2m/s, the best water spray flow was10L/min.