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主题:热风炉厂家为你讲解不同类型的热风炉的的优缺陷 [收藏主题]  
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admin 发表于:2019-08-29 14:04:18  Post IP:121.238.98.36 | 只看该作者 查看该作者主题 楼主 
热风炉作为热动力机械的热风炉于20世纪70年代末在我国开始广泛应用,它在许多行业已成为电热源和传统蒸汽动力热源的换代产品,而大家知道各种类型的热风炉的优点缺点吗,接下来天然气热风炉厂家给大家介绍下各种类型的热风炉的优点缺点。
Hot blast stove, as a hot blast stove of thermodynamic machinery, has been widely used in China since the end of 1970s. It has become a replacement product of electric heat source and traditional steam power heat source in many industries. Do you know the advantages and disadvantages of various types of hot blast stoves? Then Huashuai natural gas hot blast stove will introduce various types to you. Advantages and disadvantages of hot stove. 1.铸铁管式热风炉,不能承受高温高压,供给的风温很低,已被淘汰。
1. Cast iron tubular hot-blast stove can not withstand high temperature and pressure, and the air temperature supplied is very low, which has been eliminated.
2.内燃式热风炉虽然通过改进耐火材料等措施可为高炉提供1000℃以上的风温,但由于这种热风炉是由燃烧室和蓄热室组成,中间用隔墙分开,而隔墙在燃烧和送风过程中产生温度波动,尤其是下部温差很大,在各种应力作用下易裂缝,掉砖,烧穿甚至倒塌,同时,这种热风炉采用的金属燃烧器使火焰直接冲击隔墙,并在燃烧室中引起共振,更加剧了砖衬的破损。改造型的内燃式热风炉虽在隔墙中下部温差较大的区域内外环间砌了一层绝热砖,并用陶瓷燃烧器替代金属燃烧器,克服了隔墙烧穿问题,减轻了破损,但并没有取消隔墙,从根本上解决掉砖的问题。
2. Internal combustion hot blast stove can provide blast furnace temperature above 1000 C by improving refractory materials, but it is composed of combustion chamber and regenerator, separated by partition wall, which produces temperature fluctuation in the process of combustion and air supply, especially in the lower part, under various stresses. It is easy to crack, drop bricks, burn through and even collapse. At the same time, the metal burner used in the hot blast stove makes the flame directly impact the partition wall and cause resonance in the combustion chamber, which further aggravates the damage of the brick lining. Although the reformed internal combustion hot blast stove has built a layer of insulating brick between the inner and outer rings of the large temperature difference between the middle and lower parts of the partition wall and replaced the metal burner with a ceramic burner, the problem of partition wall burning through has been overcome and the damage has been reduced, but the partition wall has not been cancelled, and the problem of brick removal has been fundamentally solved.
3.外燃式热风炉的优点是取消了隔墙,将燃烧室与蓄热室完全分开,蓄热室的格子砖柱稳定性好。缺点是:①投资大、占地面积大,所需钢材与耐火砖增加。②在燃烧室与蓄热室的联结段、砖型复杂、砌筑困难,并成为结构上的薄弱环节。
3. The advantage of the external-fired hot blast stove is that the partition wall is cancelled and the combustor and regenerator are completely separated. The lattice brick column of the regenerator has good stability. The shortcomings are as follows: 1) large investment, large area, increased steel and refractory bricks required. (2) In the connection section between combustion chamber and regenerator, the brick type is complex, the masonry is difficult, and it has become a weak link in the structure.
4.顶燃式热风炉的优点是:①和外燃式一样,取消了隔墙,从根本上消除内燃式的致命弱点,并在热风炉容量相同的情况下,蓄热面积增加25~30%。②采用短焰燃烧器,直接在顶部燃烧,高温热量集中,减少了热损失,有利于拱顶温度的提高。③炉型简单、结构强度好,砖型少,砌筑容易。④改善了耐火材料的工作条件,下部负荷重的地区工作温度低;上部工作温度高而负荷小。⑤占地面积小,与外燃式相比,大约可节省20%的钢材和耐火材料。但要使顶燃式热风炉顺利工作也要解决以下问题;①需要大功率的短焰燃烧器,保证煤气在拱顶的有限空间内完全燃烧,并保证气流的均匀分布。②拱顶设置燃烧器的部位,要经受强烈的温度波动。因此这部分需要用耐高温而且耐急冷急热性能好的耐火材料。③由于热风出口在顶部,热风管道要伸长至炉顶高度,需设相应的管道支架与膨胀圈。④由于热风阀,燃烧阀等阀门在顶部,必须在顶部设吊装设备,以便检修更换。
4. The advantages of top-fired hot blast stove are as follows: 1. Like external-fired hot blast stove, the partition wall is eliminated, and the fatal weakness of internal combustion type is eliminated fundamentally. Under the same capacity of hot blast stove, the heat storage area is increased by 25-30%. (2) The use of short flame burner directly burns at the top, and the high temperature heat concentration reduces the heat loss, which is conducive to the increase of the vault temperature. (3) The furnace type is simple, the structure strength is good, the brick type is few, and the masonry is easy. (4) The working conditions of refractories have been improved, and the working temperature in the area with heavy load at the lower part is low, while the working temperature in the upper part is high and the load is small. (5) Small area, about 20% steel and refractories can be saved compared with external combustion. But in order to make top-fired hot blast stove work smoothly, the following problems should be solved: (1) High-power short-flame burner is needed to ensure the complete combustion of gas in the limited space of vault and the uniform distribution of air flow. (2) The position where the burner is set on the vault should undergo strong temperature fluctuation. Therefore, this part needs refractories with high temperature resistance and good quench and heat resistance. (3) Because the hot air outlet is at the top, the hot air pipeline should be extended to the top of the furnace, and the corresponding pipe support and expansion ring should be set up. Because hot air valves, combustion valves and other valves are at the top, hoisting equipment must be installed at the top for maintenance and replacement.
5.球式热风炉目前只用于100m3以下的小高炉,它类似顶燃式热风炉,只是不砌格子砖,而是将高铝球直接装入热风炉内。它要求煤气含尘低否则清理换球的工作量很大。
5. Ball-type hot blast stove is currently only used in small blast furnaces below 100m3. It is similar to top-fired hot blast stove, but does not build checked bricks, but directly loads high alumina balls into the hot blast stove. It requires low dust content of gas, otherwise it will take a lot of work to clean and change balls.
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