1、A New Distinguish Method of Blending Coals Slagging Characteristic Abstract : The slagging characteristic of coal effects the safe operation of boiler unit directly, the study on coal slagging is paid more and more attention by scholars of the world. Because of the complexity of coal characteristic,
2、 the blending coals slagging characteristic is more complex than single coal. The study method of blending coals characteristic is the same as the single coal method, but the simple method cant distinguish the blending coals slagging characteristic well and truly. This paper gives the new distinguis
3、h method of blending coals slagging characteristic based on experimentation condition, it is the rate of slag and furnace refuse. The rate of slagging on furnace wall and the refuse on furnace bottom has utilized to distinguish the slagging characteristic of coal. The result shows that the rate of s
4、lag and furnace refuse method has better veracity. Keywords: Slagging；Blending Coals；Distinguish Method 1. Introduction The slagging characteristic of coal effects the safe operation of boiler unit directly. So, scholars of the world attach importance to the study of coal slagging. At present, the s
5、tudy of slagging characteristics of blending coals is depended on the study of single coal. The fuel character, boiler structure and operation mode are the factors of deciding boiler slagging. The fuel character is the basic of boiler design and operation. So, the study on fuel slagging characterist
6、ic is important. The study on distinguish slagging character is paid more and more attention by scholars.There are many distinguish methods and index of single coal slagging characteristics. The most of the methods are ash melting temperature slagging index method, ash element slagging index method,
7、 ash viscosity slagging index method, special type method and integrative distinguish method . In USA, every slagging distinguish method are studied in 130,300 MW and upwards units. The results show that no method can forecast slagging trend complete accurately. The resolution of the softening tempe
8、rature and silicon aluminum ratio is the highest. Harbin complete institute distinguishes the slagging trend of 250 kinds of Chinese coal; the resolution is 65%. Harbin boiler factory and Harbin Institute of Technology study on lignite slagging trend, the results show that the resolution of the soft
9、ening temperature and silicon aluminum ratio is 74%. Some scholars adopt ash element slagging index method and ash liquation index , ash melting temperature , supporting vector machine , base/acid and silica/alumina, to study coal slagging characteristic. Many scholars study on blending coals slaggi
10、ng characteristics . They consider that the slagging character of blending coals is more complex than single coal because of the complex of single coal slagging character. The blending coals research method is the same as single coal research method, but it cant distinguish blending coals slagging t
11、rend by single coal slagging trend. It means that the difference of slagging character between blending coals and singles coal is great. This paper gives the new distinguish method of blending coals slagging characteristic based on experimentation condition, it is the rate of slag and furnace refuse
12、. The rate of slagging on furnace wall and the refuse on furnace bottom has utilized to distinguish the slagging characteristic of coal. 2. Test Rig and Experimental Process 2.1. Coal Analysis The single coal analysis and the rate and numbers of blending coals are shown in Table 1 and Table 2. Table
13、 1. Single coal analysis. CoalHuolinheYangcaogou Fengguang MeiheProximate Madanalysis Aad (%) Vad FCad Cad Ultimate HadAnalysis Had(%) Nad Oad Qnet, ar (J/g) 12.22 24.42 30.75 32.61 45.91 2.70 0.5 0.73 13.52 15919 7.01 43.43 22.95 26.61 35.82 3.21 0.35 0.53 9.65 12388 8.60 51.39 24.34 15.67 26.74 2.
14、42 0.18 0.73 9.94 9249 5.89 22.68 35.18 36.25 52.24 4.04 1.65 1.38 12.12 19819Table 2. The rate and number of blending coals. NO. The rate of single coal (%) Huolinhe Meihe Fengguang Yangcaogou1# 80 20 0 0 2# 70 30 0 0 3# 80 0 20 0 4# 70 0 30 0 5# 80 0 0 20 6# 70 0 0 30 7# 60 20 10 10 8# 70 10 10 10 9
