The Simulation And Analysis Of Stream-byproduct Hydrogen Chlorine Graphite Synthesizer

How to recycle the heat of hydrogen chloride reaction effectively has always beena concern and explore important question for the chlor-alkali enterprises. Based on the30t/d hydrogen chloride gas production device of Chongqing Changshou Chemical Co.,Ltd, this paper adopts the infinitesimal section integral method and establishesmathematical models of convection heat transfer, radiation heat transfer and boilingheat transfer in every infinitesimal section of the furnace, and then simulates the heattransfer, gas temperature gradient and the temperature difference between internal andexternal wall, etc. the Fortran programming is used to the whole process calculation.Simulation results show that: the radiation heat transfer is the dominant position inthe heat transfer process, especially in the high temperature area; along the axial, thetemperature drop of synthesis gas is gradually from sharpness to mildness; in the bottomof the steam-generation section, the temperature of synthesis gas is higher and theradiation to the inner wall is strong, so that the temperature difference between outerand inner wall is greater and makes it difficult to control the temperature difference.Moreover, the influence factors of the furnace, for example, the stream content,fouling factor and drum pressure, etc. are analyzed.（1）. Stream content has a greaterinfluence on the heat transfer process. When stream content is lower than3.0%, the heattransfer coefficient is relatively small and goes against removing the reaction heat andproducing stream of the drum; while stream content is higher than7.1%, the role ofstream content in enhancing the heat transfer effect is not obvious; comprehensiveconsideration the corrosion effect of condensing acid on the equipment, the streamcontent should be controlled at around5%.（2） The influence of fouling factor on thewall temperature is remarkable. When fouling factor reaches3.2×10^-4（m²k）/W in thebottom, wall temperature is up to568K. Because the critical radiation temperature ofsteel plate is573K, it’s indispensible to remove dirt timely and control the walltemperature strictly for the safe and stable operation of the furnace.（3） Drum pressurehas great influence on the utilization ratio of system effective energy. When the drumpressure is0.2MPa, the rate of effective energy utilization is29.92%; when the drumpressure is1.26MPa, the effective energy utilization ratio reaches42.11%. So,increasing drum pressure is beneficial to improve the effective energy utilization.The method of infinitesimal section integral is adopted and the heat transfer process and the temperature distribution is described in this paper, the simulation resultsconform to the actual working condition. The simulation results and analysis viewpointscan be used as the new thought and theory basis for the optimization and operation ofthe furnace.