盘山电厂烟气余热利用装置改造技术研究

发布时间：2018-07-20 12:18

【摘要】：近年来,随着环保指标的日趋严苛,如何降低燃料成本、提升机组效率,成为新的研究重点。科研工作人员将目光集中在烟气排烟热量上,想要将这部分热量进行再利用,因此,烟气余热利用装置应运而生。本文了介绍了这项新技术,并以盘山电厂#3机组改造为例,对加装烟气余热利用装置后,机组发电煤耗、脱硫系统水耗两个方面进行经济分析和比较。首先,运用苏联1973年锅炉热力计算标准方法中推荐的公式,计算出烟气露点,明确了此温度远低于120℃的锅炉排烟温度这一重要依据,为烟气余热利用装置提供理论上的可行性,同时对工业中广为应用的金属材料进行比较和分析,找到适用于本次改造的原材料。其次,阐述了烟气余热利用的基本原理、设计方案以及相关基本参数的选择原则与经济性分析。按照设计条件,对烟气余热利用装置布置方式的选取、水侧入口取水方式和温度的选取、气侧烟气温降的选取、以及装置内管排的布置方式等,都进行了详细的说明。最后,依托盘山电厂#3机组,根据等效焓降法原理,结合汽轮机厂热平衡图,建模分析,计算出烟气余热利用装置在额定工况下节约发电煤耗可以达到1.60g/kwh。同时,考虑到由于换热作用,使脱硫吸收塔入口温度降低,减少了脱硫塔水分蒸发,降低了烟气的携水能力,降低了脱硫系统水耗在,最终比较得出在500MW负荷工况下,脱硫系统理论节水量达到峰值,为33.95t/h。
[Abstract]:In recent years, with the increasingly harsh environmental indicators, how to reduce the fuel cost and improve the efficiency of the unit has become a new research focus. The researchers focus on the heat of smoke exhaust and want to reuse this part of heat. Therefore, the waste heat utilization of flue gas has come into being. The transformation of #3 unit in mountain power plant is an example of economic analysis and comparison of two aspects of the power generation coal consumption and the water consumption of desulphurization system after adding the waste heat utilization device of the flue gas. First, the flue gas dew point is calculated by using the formula recommended in the Soviet Union's 1973 boiler thermodynamic calculation standard method, and the flue gas exhaust temperature far below 120 centigrade is clearly defined. It is an important basis to provide theoretical feasibility for the waste heat utilization device of flue gas. At the same time, it compares and analyses the widely used metal materials in industry, and finds the raw material suitable for this transformation. Secondly, the basic principle of the waste heat utilization of flue gas, the design scheme and the selection principle of the related basic parameters and the economic analysis are discussed. According to the design conditions, the selection of the exhaust heat utilization device, the selection of water intake mode and temperature, the selection of gas temperature drop in the gas side, and the arrangement mode of the pipe row are described in detail. Finally, relying on the principle of the equivalent enthalpy drop method based on the principle of the equivalent enthalpy drop, the #3 unit of Panshan Power Plant is combined with the heat balance chart of the steam turbine factory. The model analysis shows that the power generation coal consumption can be saved at the same time of 1.60g/kwh. at the rated working condition. Considering the heat transfer effect, the inlet temperature of the desulfurization absorber tower is reduced, the water evaporation of the desulfurizer tower is reduced, the water carrying capacity of the flue gas is reduced and the water consumption of the desulfurization system is reduced, and the final comparison is in the 500MW negative. Under the load condition, the theoretical water saving amount of desulphurization system reaches a peak value of 33.95t/h.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621;TK115

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