Study On Pyrolysis Rules Of Fire-retardant Wood

The burning of super polymer teases out the flammable gases because of the external heat generally, more than that the mix of the flammable gases and oxygen in the air can cause fire. The thermal decomposition is the key stage of the super polymer's burning, and it is a complex physical chemical process. The thermal decomposition is a gently hot act, hoping to prevent fire and to gather something of the high flame retardant effect,we must deeply study the mechanism and pyrogenic rule of the relevant materials. The fundamental purpose of this paper is studying the pyrogenic rules of fire-retardant material, establishing kinetic equation of the thermal decomposition and mastering primary stage's rule of the fire-retardant material's burning.The underlying material is wood, the flame retardant agents are phosphoric acid, ammonium chloride, ammonium dihydrogen phosphate, zinc chloride, boric acid. First, this paper carries on flame retardant treatment to wood with the flame retardant agents choosed. Then, this paper carries on TG experiment by means of setsys evolution at different heating rate and analyses data with TG and DSC. TG, DTG and DSC curves indicate that the pyrolytic process of wood can be divided into three stages, we can them dry stage, charring stage and burning stage. The pyrolytic process of samples treated with flame retardant agents can also be these three stages. The flame retardant agents can bring down the beginning reaction temperature of the underlying material, delay final temperature and influence the peak temperature of DTG and DSC curves. The heating rate can influence fairly the pyrolytic process of samples, if the heating rate increases, the beginning reaction temperature, final temperature and peak temperature of DTG and DSC curves can also increase.Establishing kinetic equation of the thermal decomposition, solving kinetic parameters with Coast-Redfern, and then we can solve the pyrolysis kinetic equation of the wood stages; next, this paper to validate parameters with Doyle.