单独以天然气或煤为原料的合成气生产工艺，技术上已较为成熟，然而由于原料自身的特点，仍存在问题。天然气制合成气流程短、清洁、高效，但原料价格高、氢碳比偏高，同时过高的管网价格严重制约了天然气路线的推广。煤气化制合成气氢碳比低，往往通过变换工段来提高氢碳比，同时又生成大量的CO2，增加了酸洗工段的负荷和运行成本。此外，煤制合成气设备投资高，环境污染大，不符合可持续发展的要求。由此，提出煤与天然气共气化制备合成气工艺，以期降低生产成本、减少CO2的排放，实现H2/CO比值可调。主要工作内容包括： 从热力学角度对煤与天然气共气化过程进行了分析，阐述了共气化的反应过程并计算了各反应的平衡常数与温度之间的关系，同时对各反应的竞争能力进行了比较。 采用Aspen Plus软件对煤与天然气共气化过程进行了模拟，分析了反应压力、水煤浆浓度、氧气进料流量、天然气进料流量对气化室出口温度、气体摩尔组成、合成气摩尔分数、H2/CO的影响。计算了多种不同进料流量下的出口参数，通过对这些数据进行筛选得到气化室出口温度在1340 ~ 1360 ℃之间，H2/CO大于1.15，合成气摩尔分数大于0.72时的天然气和氧气的进料流量。 采用FLUENT软件以德士古水煤浆气化炉为研究对象对煤与天然气共气化过程进行了模拟，得到了气化炉内冷态流场分布、温度分布、压力分布、各气体组分分布，以及气化炉轴线处温度和各气体组分的分布规律，结果与德士古气化三区模型相符。且将Aspen Plus与FLUENT模拟结果相比两者相差不大，说明FLUENT模拟结果能够正确的反应气化炉内的情况。

Synthesis gas can be generated either by steam reforming of natural gas, which is based natural gas only, or by coal gasification in which coal only. However, many problems are accompanied with the gasification processes consuming sole material. Natural gas to syngas process is short, clean, efficient, while the high price for natural gas, high H2/CO ratio, and high network prices has seriously restricted the promotion of natural gas. The H2/CO ratio of coal gasification is often improved through the CO shift unit, so a large amount of CO2 discharge is unavoidable, also load of pickling section and running costs were increased. In addition, high investment and environmental pollution for coal gasification does not meet the requirements of sustainable development. Therefore, synthesis gas production by co-gasifying coal and natural gas was proposed, in order to reduce the production cost and CO2 emission, and realize the H2/CO ratio adjustable. The main works were included: The reaction process was analyzed on synthesis gas production by co-gasifying coal and natural gas from the thermodynamic point of view, from which relationship between the equilibrium constant and the temperature is calculated, also the competition ability of the reactions in the process is compared. Synthesis gas production by co-gasifying coal and natural gas was analyzed with Aspen Plus. The effects of parameters, such as reaction pressure, coal water slurry, oxygen flow rate and natural gas flow rates on the temperature of synthesis gas, the gas mole composition, the syngas mole fraction and H2/CO ratio were analyzed. The oxygen and natural gas flow rates were calculated which the outlet gas temperature between 1340 oC and 1360 oC, H2/CO ratio is large than 1.15, the synthesis gas mole fraction is greater than 0.72. Synthesis gas production by co-gasifying coal and natural gas process based on Texaco was studied by using FLUENT software. The calculated temperature and composition of the outlet gas were obtained, and the flow field and gas composition distribution were predicted. The results agreed well with the Texaco gasification model presented. It was also found that the results between Aspen Plus and FLUENT has little difference, indicating the numerical model was reasonable.