燃煤电站一次风加热流程优化的高效集成系统性能分析
发布时间：2018-08-22 17:58
【摘要】：在常规燃煤电站机组中,一次风加热流程和尾部烟道低温烟气换热流程存在数量可观的可用能损失和较大的优化利用空间,为减小系统换热过程的不可逆损失,该文提出基于一次风加热流程优化的高效集成系统,预干燥进入制粉系统的较高水分原煤,降低一次风的吸热量,在此基础上利用两级蒸汽加热器分级加热一次风,同时优化低温烟气换热流程,回收低温烟气余热,可大幅提高机组出功。该文以国内某典型1000MW超超临界燃煤机组为案例,针对一次风加热流程优化的高效集成系统的换热过程以及能量分配进行了热力计算,并对系统做了技术经济性分析。研究结果表明,原煤水分由18.1%干燥至8%的情况下,一次风流程-损失大幅下降,锅炉有效利用热量显著提高,机组功率增加27.6MW,发电煤耗率降低6.7g/(k W·h),烟气的酸露点温度和空气预热器的换热面积均有一定程度下降,机组运行经济性与安全性均得到一定的提升,年增加净收益可达1129.4万元。
[Abstract]:In order to reduce the irreversible loss in the heat transfer process of the system, there is a considerable amount of available energy loss and a large optimal utilization space in the primary air heating process and the tail flue gas heat transfer process in conventional coal-fired power plant units. In this paper, a high efficient integrated system based on the optimization of primary air heating process is proposed to pre-dry the raw coal with higher moisture content into the pulverizing system to reduce the heat absorption of the primary air. On this basis, the two-stage steam heater is used to heat the primary air step by step. At the same time, optimizing the flow of low-temperature flue gas heat transfer and recovering the waste heat of low-temperature flue gas can greatly improve the generating power of the unit. Taking a typical 1000MW ultra-supercritical coal-fired unit as an example, the heat transfer process and energy distribution of a high-efficiency integrated system optimized by primary air heating process are calculated in this paper, and the technical and economic analysis of the system is made. The results show that when the moisture content of raw coal is increased from 18.1% to 8%, the primary air flow-loss is greatly reduced, and the effective heat utilization of the boiler is significantly increased. When the power of the unit is increased by 27.6 MW, the coal consumption rate of power generation reduces the acid dew point temperature of 6.7g/ (k W h), flue gas and the heat transfer area of air preheater to a certain extent, and the operation economy and safety of the unit are improved to a certain extent, and the annual net income can reach 11.294 million yuan.
【作者单位】： 电站设备状态监测与控制教育部重点实验室(华北电力大学);
【基金】：国家重点基础研究发展计划(973)项目(2015CB251504) 国家自然科学基金(51476053) 中央高校基本科研业务费专项基金(2015ZZD10)~~
【分类号】：TM621
[Abstract]:In order to reduce the irreversible loss in the heat transfer process of the system, there is a considerable amount of available energy loss and a large optimal utilization space in the primary air heating process and the tail flue gas heat transfer process in conventional coal-fired power plant units. In this paper, a high efficient integrated system based on the optimization of primary air heating process is proposed to pre-dry the raw coal with higher moisture content into the pulverizing system to reduce the heat absorption of the primary air. On this basis, the two-stage steam heater is used to heat the primary air step by step. At the same time, optimizing the flow of low-temperature flue gas heat transfer and recovering the waste heat of low-temperature flue gas can greatly improve the generating power of the unit. Taking a typical 1000MW ultra-supercritical coal-fired unit as an example, the heat transfer process and energy distribution of a high-efficiency integrated system optimized by primary air heating process are calculated in this paper, and the technical and economic analysis of the system is made. The results show that when the moisture content of raw coal is increased from 18.1% to 8%, the primary air flow-loss is greatly reduced, and the effective heat utilization of the boiler is significantly increased. When the power of the unit is increased by 27.6 MW, the coal consumption rate of power generation reduces the acid dew point temperature of 6.7g/ (k W h), flue gas and the heat transfer area of air preheater to a certain extent, and the operation economy and safety of the unit are improved to a certain extent, and the annual net income can reach 11.294 million yuan.
【作者单位】： 电站设备状态监测与控制教育部重点实验室(华北电力大学);
【基金】：国家重点基础研究发展计划(973)项目(2015CB251504) 国家自然科学基金(51476053) 中央高校基本科研业务费专项基金(2015ZZD10)~~
【分类号】：TM621
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