一种新型煤粉经济细度确定方法

The New Method for Determining Pulverized Coal Economic Fineness

目前火电厂多采用掺烧技术降低煤炭资源紧张带来的成本压力,然而经验公式法仍然是确定煤粉经济细度的主要方法,这种方法并不能根据燃煤掺烧的比例及时、准确的改变经济细度,造成了飞灰含碳量增加,锅炉燃烧效率不高等问题,试验法可以准确的得出经济细度但费时费力不能频繁进行所以也不能满足电厂需求。针对当前火电厂的运行情况,提出了一种新型煤粉经济细度确定方法。根据经济细度与干燥无灰基挥发分Vdaf、煤粉均匀指数n的关系以及Vdaf与着火温度的关系结合电厂混煤掺烧技术得出煤粉细度与混合燃煤Vdaf之间的关系从而得出煤粉经济细度。克服了电厂实际燃烧煤种脱离设计要求对煤粉经济细度确定的影响,大大提高了煤粉经济细度确定的准确性。依托混煤掺烧技术提出的优化方案可实时提供煤粉经济细度,为锅炉燃烧优化,节能减排提供了新思路。

Coal blending technology are commonly used in coal-fired thermal power plant in recent years to ease cost pressures.But thermal power plants still use empirical formula to determine the economic fineness of pulverized coal. This approach can not change the economic fineness based on the proportion of blending coal timely and accurately, resulting in increased carbon content of fly-ash and reduced combustion efficiency of boiler.Test method can get accurate economic fineness of pulverized coal,but it is time-consuming and hard to execute frequently and can't reach the need of plant.In this paper,a new method for determining pulverized coal economic fineness is proposed. Dry and ash-free basis、coal uniformity index、Ignition temperature、proportion of blending coal are considered as parameters.According to the relationship between these parameters the best coal fineness can be obtained in real-time.The influence of coal blending technology is reduced greatly and the accuracy of the economic fineness is improved.When integrated in optimal combustion solution based on coal blending technology,it can display economic fineness quickly and accurately.And it's a fine direction for combustion optimization.