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As an efficient energy conversion system, the combined cycle power plant (CCPP) is widely used in such industrial fields as iron and steel. As the core component of CCPP, stable operation of waste heat boiler directly affects efficiency and safety of the entire unit. In the paper, the in-depth study aiming at frequent leak problem at the upper part of high pressure evaporator of supporting waste heat boiler facing flue gas in gas turbine unit of a steel plant is carried out as well as the leakage causes are analyzed to be that the deposit sediment in its lower header causes water flow rate in evaporator tube to be decreased so that impingement corrosion of steam water mixture is generated. Meanwhile, the phenomenon of “flue gas corridor” in local area of furnace exacerbates the corrosion process. For these problems, such measures as replacing leaking pipe section, reforming periodic discharge pipe system of lower header to improve efficiency of pollution discharge, repairing and perfecting gas baffle to reduce formation of “flue gas corridor”, optimizing periodic pollution discharge operations as well as formulating periodic plans of inspection and maintenance are taken to effectively solve the leak problem for high pressure evaporator so that the stability and safety of equipment are improved.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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