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为什么燃煤热风炉会经常出现结焦的问题呢?

2019-08-13 16:56:40 常州亿创能源科技有限公司 阅读

热风炉厂家了解,燃煤热风炉结焦是个很复杂的物理化学过程,产生这种现象会很明显的影响它的使用,它涉及煤的燃烧、炉内传热、煤质的结焦特性、煤灰粒子在热风炉内运动以及煤灰与管壁间的粘附等过程。 结焦的原因大致有以下几个方面:
According to the understanding of hot-blast stove manufacturers, coking in coal-fired hot-blast stove is a very complex physical and chemical process, which will obviously affect its use. It involves coal combustion, heat transfer in furnace, coking characteristics of coal, movement of coal ash particles in hot-blast stove and adhesion between coal ash and pipe wall. The causes of coking are as follows: (1)灰的成分, 灰的熔融性与其成分和含量有关
(1) Composition of ash and melting property of ash are related to its composition and content.

灰中的碱性物质的增加将使灰的熔点降低,当煤含有较多量硫化铁的时候,结焦最为严重。
The increase of alkaline matter in ash will reduce the melting point of ash, and the coking is the most serious when coal contains more iron sulfide.

(2)煤粉细度不均匀
(2) Non-uniform fineness of pulverized coal

煤粉细度和粒度分布对烘干热风炉结渣有一定影响,煤粉过细、过粗均可能引起结渣。煤粉细度视煤种与具体的烘干热风炉的结构而定,应通过试验来确定。
The fineness and particle size distribution of pulverized coal have a certain influence on Slagging in drying hot blast stove. Excessive fineness and coarseness of pulverized coal may cause slagging. The fineness of pulverized coal depends on the type of coal and the structure of the drying hot blast stove, which should be determined by test.

(3)燃料与空气的混合比
(3) Mixing Ratio of Fuel to Air

燃烧过程中, 若空气量不足,其燃烧时就不易达到完全燃烧,将导致灰熔点降低,形成结焦;火焰偏斜,使最高火焰层移到边侧,这样灰就得不到足够的冷却,而灼热的灰粒与水冷壁受热面接触的时候,就很快的粘了上去,形成结焦。
In the process of combustion, if the air content is insufficient, it will not be easy to achieve complete combustion, which will lead to the reduction of ash melting point and coking; the flame deflects, so that the highest flame layer moves to the side, so that the ash will not be cooled enough, and the hot ash particles will quickly stick up when they contact the heating surface of the water wall. Coking.

(4)漏风降低了燃烧室的温度水平, 推迟燃烧进程
(4) Air leakage reduces the temperature level of combustion chamber and delays combustion process.

冷灰斗处漏风会抬高火焰中心,火焰拉长,导致炉膛出口烟温升高,容易引起屏过结焦。
The air leakage at the ash hopper will raise the flame center, and the flame will be lengthened, which will lead to the increase of smoke temperature at the furnace outlet and easily lead to the over-coking of the screen.


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