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在能源紧张的情况下,很多国家都在研制以煤为燃料的闭式循环燃气轮机,它可以就地取材,燃烧高硫煤种。我国也在研制这种燃气轮机。这种闭式循环燃气轮机热电合供系统用的常压沸腾床燃烧室设计的主要技术关键是埋在床内的热交换器。该热交换器要求在接近床温下运行。当热电合供系统的设计煤种为高硫煤时(含硫量～4%),由于热交换器在高温(850℃)下运行,使热交换器的管子可能承受严重的高温腐蚀,如高温氧化;硫、氮、氧等混合气体的腐蚀;硫酸盐的热腐蚀和灰份的磨蚀(即冲刷腐蚀)。这种高温腐蚀的特点将取决于床内环境,可能与局部
In the case of energy shortage, many countries are developing coal-fired closed cycle gas turbines, which can be drawn on the spot, burning high-sulfur coal. Our country is also developing such a gas turbine. The main technical key to the design of a constant pressure bubbling bed combustor for a closed loop gas turbine thermoelectric power system is a heat exchanger buried in a bed. The heat exchanger requires operation near bed temperature. When the cogeneration system design coal is high sulfur coal (sulfur content ~ 4%), the tubes of the heat exchanger may be exposed to severe high temperature corrosion due to the heat exchanger operating at high temperatures (850 ° C) High temperature oxidation; Sulfur, nitrogen, oxygen and other mixed gas corrosion; sulfate corrosion and ash ash erosion (erosion). The characteristics of this high temperature corrosion will depend on the bed environment and may be localized