Industrial Applications of Fine Desulfurizers in Natural Gas Processing in China

摘要

The H_2S content of most natural gas in China, supplied to users by pipeline, is typically 10-30ppm, but can be 500-1000ppm in associated gas. This paper describes the sulfur-removal principles and main industrial applications for T703 Ferric Oxide Fine Desulfurizer, DS-1 Combined Oxides Fine Desulfurizer, and the JTL-7 Process which have been developed by Hubei Research Institute of Chemistry (HRJC) since 1996. Test data show that the sulfur capacities of T703 for fine removal [outlet H2S less than 0.03ppm] and bulk removal [outlet H_2S l-10ppm] are 4 times and 3.5 times higher than those of common ferric oxide desulfurizers. The products also have the advantages of good strength and do not powder in the presence of water. However, T703, like common ferric oxide desulfurizer, works well only with O_2/H_2S = 5-10. DS-1 solves this problem and can be applied in feeds with oxygen absent. The JTL-7 Process can remove H_2S, COS, CS_2, RSH, RSR, RSSR at 350-400℃ [633-752°F] to solve the problem of fine desulfurization of natural gas to replace the traditional high temperature process. Some of the main industrial applications to date have been: [1] T703 is applied by Tianjin Dagang Oilfield to remove H_2S from natural gas to protect equipment from corrosion. The outlet H_2S content has been below 0.03 ppm for one year, thereby completely solving the problem of corrosion. [2] T703 is used by the Luzhou Natural Gas Chemical Plant to protect steam reforming and other catalysts in an 850 tonnes/day ammonia plant. Trace oxygen is added to the feed because the O_2/H_2S ratio is less than 3.0 in the natural gas. The fine desulfurizer has been used beneficially for more than two years. [3] DS-1 is used to remove H_2S from oxygen-free associated gas to prevent equipment corrosion in the Hubei Jianghan Oilfield. The outlet H_2S content is below 0.03 ppm, copper strip corrosion of LPG is less than lb and separate LPG desulfurization is not required.