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热风炉用耐火砖损坏的原因?怎么解决

2018-11-14 13:39:30 常州市星火铝艺制品有限公司 阅读

热风炉用耐火砖成都收账破坏因素及破损情况,随热风炉结构形式和结构特征及使用环境成都找人公司不同而不同。 热风炉用耐火砖成都收账破损情况是:一般收账内燃式热风炉,最容易在隔墙部分产生开裂、短路,在拱顶产生裂纹和垮塌等,外燃式热风炉成都找人公司两室拱顶及其接管等部位砌体容易产生开裂和脱落;顶燃式热风炉的破损,主要是在拱顶以及拱顶与接管口处。引起热风炉破坏的因素很多,而且在成都找人公司的不同部位,其主要原因也不相同。因此,要详细分析成都收账公司各部分耐火砌体的破坏原因及破坏机理十分复杂,这里概括起来可以归纳为以下几方面。

The damage factors and conditions of refractory bricks used in hot blast stoves vary with the structural form and characteristics of hot blast stoves and the use environment. The damages of refractory bricks used in hot blast stoves are as follows: general internal combustion hot blast stoves are most likely to crack and short circuit in the partition wall, crack and collapse in the vault, and masonry in the vault of two chambers and its nozzles of external combustion hot blast stoves are prone to crack and fall off; top combustion hot blast stoves are mainly damaged at the vault top. And vault and nozzle mouth. There are many factors causing the destruction of hot blast stove, and the main reasons are different in different parts of hot blast stove. Therefore, it is very complicated to analyse the failure causes and mechanism of refractory masonry in detail, which can be summarized as follows.

 (1)高温热应力作用

(1) high temperature thermal stress

成都收账公司炉墙耐火砖内、外侧表面温度差很大,产生很大的热应力,即砖衬内侧受到很大的压应力,外侧受到很大的拉应力。并且,耐火砌体受到的膨胀力和荷重力主要集中于热风炉内层砖衬的内表面上,加之换炉操作更加剧了耐火砖衬内侧面的冷、热变化。在这些因素的作用下,耐火砌体的内侧面首先发生开裂,进而产生松动和脱落,严重时造成拱顶垮塌、隔墙倾倒等。

The temperature difference between inner and outer surface of refractory bricks of hot blast stove wall is very large, which results in great thermal stress, that is, the inner side of brick lining is subjected to great compressive stress and the outer side is subjected to great tensile stress. Moreover, the expansion force and loading gravity of refractory masonry mainly concentrate on the inner surface of the brick lining of the hot blast stove, and the change of temperature and cold on the inner surface of the brick lining is aggravated by the furnace changing operation. Under the action of these factors, the inner surface of refractory masonry cracks firstly, and then loosen and fall off. In serious cases, the vault collapses and partition walls collapse.

(2)化学侵蚀作用

(2) chemical erosion.

热风炉耐火砌体所处周围介质,主要是煤气灰尘中含有碱性氧化物、碱金属及硅酸盐等,在高温下与耐火砌体成分生成低熔点物质,并产生相变,致使耐火砖组织遭到破坏,使耐火砖衬的强度等高温性能降低。特别是格子砖的表面被渣化后形成玻璃质,使其热交换能力大大减弱。

The surrounding medium of refractory masonry of hot blast stove mainly contains alkaline oxides, alkali metals and silicates in gas dust, which forms low melting point substances with refractory masonry components at high temperature and generates phase transformation, which results in the destruction of refractory brick structure and the decrease of high temperature performance such as refractory brick lining strength. In particular, the surface of the lattice brick is slagglified to form glass, which greatly reduces its heat exchange capacity.

(3)机械冲刷、磨损作用

(3) mechanical erosion and wear

主要是指高温燃烧废气和鼓风对砖衬表面的强烈冲击和磨损。特别是内燃式热风炉的燃烧室下部隔墙,由于燃烧高温气流的冲击,产生振动,使燃烧室隔墙下部开裂、脱落和短路。

It mainly refers to the strong impact and abrasion of high temperature combustion waste gas and blast on the surface of brick lining. Especially for the lower partition wall of combustion chamber of internal combustion hot blast stove, because of the impact of combustion high temperature air flow, vibration occurs, which makes the lower partition wall of combustion chamber crack, fall off and short circuit.

(4)蠕性变形作用

(4) creep deformation.

目前,对热风炉的破损研究结果,认为耐火砌体在高温、高压的作用下,产生的蠕变是导致热风炉用耐火砖破坏的重要原因。

At present, the research results of hot blast stove damage show that the creep of refractory masonry under the action of high temperature and high pressure is an important reason for the damage of refractory bricks used in hot blast stove.



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