Process Simulation Of Branu Technology Ammonia Synthesis

Ammonium is a very important chemical material. It has been widely used in agriculture, industry, national defense, medicine, metallurgy etc. It has played an important role in national economy of our country. In our country there are various raw materials, different process of big, medium and small scaled synthesize ammonia factory more than 1000s. Among them, the year produce 300,000 tons to synthesize the ammonia device contain more than 30 sets, the ammonia year yield resides the first place in the world.The large synthesize ammonia device in our country still exist equipments blemish, operation not enough well-trained, exterior condition not enough perfect etc. because of overseas technology, each factories, the production consume could not reach the design value. The process simulation technique is the best way to resolve this problem. The process simulation technique has the same credibility and more valid as experiment, its application has greatly promoted the chemistry industrial development. The chemical engineering process simulation can make design superior to turn, exaltation design efficiency, get an efficiency higher factory production as a result; it have count for much realistic meaning in remove "bottleneck" towards looking for breakdown, excellent turn production condition and operation parameter to carry on old factory improvements. This thesis is to take this as point of departure, with Tian Hua Company Brown's craft in Sichuan synthesize ammonia device for industrial background, simulated calculation of branu synthetic ammonia plant.This paper mainly includes a Primary reformer and ammonia synthesize tower to set up mold and calculation. The heat transfer model of heart combustion and reaction kinetics model of gas-solid catalytic reaction in tube are established to simulate the process of radiant section of primary reformer of branu synthetic ammonia plant. Hottle zone method joined with the reaction kinetics model to calculate three-dimensional temperature distribution of hearth and the distribution of temperature, pressure and composition in tube. The results are coincident with true value. Compared with conventional method, three-dimensional model used in the heat transfer process of hearth make the results more accurate. The method and result have great significance, which are beneficial to save energy, reduce consumption and equipment improvement. The one dimension mathematics model adoption to calculate Primary reformer, thought reaction air to once circulate the catalyst bed by piston, neglecting the temperature steps degree, density steps degree and pressure variety of diameter, the reason of catalyst's poisoned, aging to correct as a coefficient. Each cent content, catalyst bed layer temperature and pressure with conversion the variety of the depth gained by calculation. Compute a result is basic to fit together with actual measured value on the scene, the error margin verified the accuracy of mathematics model and calculation process in allow the scope..