General Software Development For Tubular-furnace Process Calculation

General software development for tubular-furnace process calculation has been completed in the thesis, including the computation modules such as the combustion calculation, the radiation chamber calculation, the convection chamber calculation, the calculation of the waste heat recovery system and the ventilation system calculation. The software could get the key process parameters, such as the furnace temperature of the radiation chamber, the tube average heat intensity, the temperature of streams leaving convection chamber, the fume discharge temperature, the negative pressure of the furnace tank, etc. It could be applied to different unit environments, such as the atmospheric and vacuum distillation unit, the reforming unit, the delayed coking unit, etc. It could be used for the process calculation of different structural furnace, such as the cylindrical furnace, four-in-one furnace, two-room vertical furnace, two-side-radiation vertical furnace.The radiation chamber calculation included different calculations, such as the multistage expanded diameter tube, more than one radiation units, different methods of radiation. The convection chamber calculation used the "three-position" approach, implementing the random combination of streams and pipe-laying of the convection chamber. New method has been brought up in the calculation of shield tubes segmentation. It could get the heat absorption capacity and calorific intensity of single row shield tubes. When it was natural ventilation, the chimney calculation could get the press drop of flue gas passing across the furnace, chimney draft and the negative pressure of furnace tank. When it was forced ventilation, it could get the pressure drop of flue gas passing the funnel and the pressure of the induced draft fan. It could be used for preliminary selection of the induced draft fan. The ventilation system drag calculation could get the pressure drop of air passage system. It could be used for preliminary selection of the blast fan. The software also could be used for the calculation of the resistance loss of different type air preheaters, such as hot oil type, tubular type and hot tubular type. The accuracy and versatility was reviewed by the different structure and operating data of different function furnaces and different type tubular furnaces. The analysis of the infection of the key process parameters to the calculation results of the software was also done. The results showed that: the accuracy of the furnace temperature calculation was well, but the accuracy of convection medium leaving temperature and smoke discharge temperature calculation was not so good. It needed improvement.General software development for the shell and tube type heat exchanger process calculating was completed in the thesis at the same time. The key process parameters of one or multistation series connection exchangers could be got, such as thermal load, the medium leaving temperature, overall heat transfer coefficient K, the dropping pressure, etc. It could be used for the process calculation of different exchangers with multi heat transfer medium and different structure, such as light pipe, bellows, etc.