Optimization Of The Unit For Transforming Natural Gas To Hydrogen

With natural gas as raw material using water vapor into rich hydrogen mixture, the process includes two steps: natural gas desulfurization and conversion processes. Process flow as shown below Feed gas changes-feed gas processing-steam conversion-CO change-hydrogen purification.Desulfurization is under certain pressure and temperature, the raw material of natural gas by manganese oxide and zinc oxide desulfurizer, take off the organic sulfur and inorganic sulfur to the allowed level of reforming catalyst. Hydrocarbon steam reforming is water vapor as oxidant, under the action of nickel catalyst, generating hydrogen rich gas mixture.The function of CO change is to make mixed gas in the transform furnace with catalyst for water gas reaction, CO further reaction with water vapor, most CO into CO2 and H2. Its process in accordance with the general transformation temperature can be divided into high-temperature shift and temperature shift.After transformation of the gas by cooling, separation process condensate, gas hydrogen purification process. Hydrogen purification methods including condensation and low temperature adsorption method, absorption, adsorption at low temperature, the pressure swing adsorption(PSA), and palladium membrane diffusion method, etc. Now in general use hydrogen purification method is a method of pressure swing adsorption(PSA), PSA technology with low energy consumption, high product purity, simple process etc. The adsorbent adsorption except hydrogen adsorption tower and other impurities to purify,hydrogen after purification of hydrogen purity can reach 99.9% ~ 99.99%.As the company’s production scale expands unceasingly, the original 15000 set/hydrogen production device cannot meet the production requirements,need to further improve this device processing capacity and production capacity, optimize the 15000 Nm3/h device.Through the calculation of raw material, catalyst, equipment modification,In this paper, the analysis of the status of the calibrate before modification, and put forward the optimization retrofit scheme, the transformation of furnace and waste heat boiler key parts such as reforming opinions, estimates the effect of modification, and compared with actual effect after modification, in addition to the modified data to calibrate process parameters and the energy consumption, and with the data analysis before modification, and further optimization measures.