CN106018204B - 一种检验煤粉粒度分布的方法 - Google Patents
一种检验煤粉粒度分布的方法 Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 60
- 239000000843 powder Substances 0.000 title claims abstract description 34
- 238000009826 distribution Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002817 coal dust Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 238000012512 characterization method Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 abstract description 14
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
本发明公开一种检验煤粉粒度分布的方法,该方法是将煤粉粒度分布用幂函数表示,将磨煤机磨出煤粉按粒度工业分析筛分,并将目数转换成粒径μm,测出不同粒径的百分含量;将测出不同粒径的百分含量带入幂函数方程式中,求出a和b,然后以粒度直径为x轴,以质量分数为y轴作图,通过a和b之间的关系,即可判断磨煤机磨出的煤粉粒度是否稳定。本发明检验煤粉粒度分布的方法对于不同磨煤机对应粒度分布方程式中的a,b值不同,但存在一定的函数关系,通过磨煤机磨出的产品计算出的a,b值能否符合该函数关系,从而对煤粉粒度大小进行表征,来判断磨煤机磨煤粉的稳定性。
Description
技术领域:
本发明涉及煤粉制备技术领域,特别涉及一种检验煤粉粒度分布的方法。
背景技术:
煤粉是由尺寸不一、形状各异的各种颗粒组成的。煤粉炉中应用的无烟煤煤粉颗粒最大直径为250~300μm,其中以20~50μm的颗粒居多;褐煤煤粉的粒径可达1000~1500μm,粉粒的形状主要决定于煤的种类,其次与磨煤的方法有关。煤粉粒度特性是进行煤质分析与燃烧系统设计的重要物理参数,是影响煤微观颗粒结构的一种宏观外在体现,从其入手可以全面构建煤粉宏观特性与微观特性的表征体系。在磨煤制粉过程中需要研究煤的粒度特性及灰分、硫分矿物质在各粒度级的分布状况,使制煤系统在磨煤制粉过程中不至于达不到要求或者产生过磨现象,从而达到煤粉提质及节能降耗的目的。
目前,煤粉制备的主要磨矿设备为磨煤机,煤粉粒度对磨煤机的出力和磨煤机电耗影响很大,对煤粉被点燃的难易程度也有很大的影响。无论对哪一种磨煤机,煤粉愈粗,出力就愈大,磨煤和输粉电耗也就愈低;煤粉愈细,粒度愈均匀,愈容易点燃,燃烧愈完全。磨煤机一段磨矿产品的粒度一般符合Rosin-Rammler分布,双峰分布和多峰分布需要两段或多段磨矿且需要进行精密的工艺配合和控制,这样会导致磨矿设备增加工艺控制复杂、困难,从而增加制煤粉成本。因此,为检验磨煤机磨煤粉的稳定性,降低生产成本,提供一种检验煤粉粒度分布的方法。
发明内容:
本发明的目的在于提供一种检验煤粉粒度分布的方法,对煤粉粒度大小进行表征,并检验出磨煤机磨煤粉的稳定性。
为解决上述技术问题,本发明采取以下技术方案:
一种检验煤粉粒度分布的方法,包括如下步骤:
S1:将煤粉粒度分布用幂函数表示,其表征磨煤机出口煤粉粒径与其所占百分含量之间的关系,所述粒度分布的幂函数表示如下;
y=axb
式中:a为粒度分布比例常数;b为粒度分布幂;x为粒度直径,单位μm;y为质量分数;
S2:将磨煤机磨出煤粉按粒度工业分析筛分,并将目数转换成粒径μm,测出不同粒径的百分含量;
S3:将上述测出不同粒径的百分含量带入上述幂函数方程式中,求出a和b,然后以粒度直径为x轴,以质量分数为y轴作图(对于同一台磨煤机两者有一定关系);
S4:从上述图中反映出煤粉粒度分布,通过a和b之间的关系,即可判断磨煤机磨出的煤粉粒度是否稳定,将计算的a值带入表达式求出b值,该值对比实测的b值,相对误差小于10%,则样品粒度符合要求。
本发明检验煤粉粒度分布的方法对于不同磨煤机对应粒度分布方程式中的a,b值不同,但存在一定的函数关系,通过磨煤机磨出的产品计算出的a,b值能否符合该函数关系,从而对煤粉粒度大小进行表征,来判断磨煤机磨煤粉的稳定性。
附图说明:
图1是本发明实施例1中检验煤粉粒度分布的方法的函数关系图。
具体实施方式:
下面结合具体实施方式对本发明的技术方案进行详细说明。
实施例1
检验某厂磨煤机煤粉粒度分布的方法,包括如下步骤:
S1:将煤粉粒度分布用幂函数表示,其表征磨煤机出口煤粉粒径与其所占百分含量之间的关系,所述粒度分布的幂函数表示如下;
y=axb (1)
式中:a为粒度分布比例常数;b为粒度分布幂;x为粒度直径,单位μm;Y为质量分数;
S2:将磨煤机磨出煤粉按粒度工业分析筛分,并将目数转换成粒径μm,测出不同粒径的百分含量,如下表1:
S3:将上述测出不同粒径的百分含量带入上述幂函数方程式(1)中,求出a和b,如下表2:
S4:如图1所示,以粒度直径为x轴,以质量分数为y轴作图,其中:x轴坐标数值标为a值,y轴坐标数值标为b2,将a和b值进行回归处理得到图1所示的函数关系图,a和b的关系为b2=11.08a0.1353。
通过上述a和b之间的关系,即可判断磨机磨出的煤粉粒度是否稳定:
i.按所得的a值检验b值,即将a值代入如下方程式:
b2=11.08a0.1353 (2)
如果计算得到的b值和实测的b值相对误差小于10%,则样品粒度符合要求;
ii.按所得的b值检验a值,即将b值代入如下方程式:
b2=11.08a0.1353 (3)
如果计算得到的a值和实测的a值相对误差小于10%,则样品粒度符合要求。
将计算的a值带入表达式求出b值,该值对比实测的b值,相对误差小于10%,则样品粒度符合要求。
Claims (1)
1.一种检验煤粉粒度分布的方法,其特征在于:包括如下步骤:
S1:将煤粉粒度分布用幂函数表示,其表征磨煤机出口煤粉粒径与其所占百分含量之间的关系,所述粒度分布的幂函数表示如下;
y=axb
式中:a为粒度分布比例常数;b为粒度分布幂;x为粒度直径,单位μm;y为质量分数;
S2:将磨煤机磨出煤粉按粒度工业分析筛分,并将目数转换成粒径μm,测出不同粒径的百分含量;
S3:将上述测出不同粒径的百分含量带入上述幂函数方程式中,求出a和b,然后以粒度直径为x轴,以质量分数为y轴作图;
S4:从上述图中反映出煤粉粒度分布,通过a和b之间的关系,即可判断磨煤机磨出的煤粉粒度是否稳定,将计算的a值带入所述粒度分布的幂函数表达式中求出b值,该值对比实测的b值,相对误差小于10%,则样品粒度符合要求。
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