1. improve the theoretical combustion temperature of hot blast stove. This is the key to obtaining high wind temperature. At present, the main measures can be taken as follows: 1) enrich the blast furnace gas and raise the calorific value of the gas. Coke oven gas can be mixed to increase the heat of gas. Generally speaking, for every 1% increase in coke oven gas, the low calorific value of mixed gas can be increased by 125-138KJ/m3, and the hot air temperature can be increased by about 15 C. (2) 提高煤气和助燃空气成都收账预热温度，即提高空、煤气带入收账物理显热。预热空煤气比富化煤气提高发热值成都找人公司方法更为理想。目前已有的预热炉技术和热风炉自预热技术等就是以此为出发点用不同方式来预热助燃空气，可提高热风炉温度。
(2) improve the preheating temperature of gas and combustion air, that is, the physical sensible heat brought by high altitude and gas. The method of preheating the air gas is more ideal than that of enriching the gas to increase the calorific value. At present, the existing preheating furnace technology and hot stove self-preheating technology are based on this to preheat combustion-supporting air in different ways, which can improve the temperature of hot stove.
(3) oxygen enriched combustion is used to reduce the amount of smoke generated. Oxygen-enriched combustion is a high-efficiency and energy-saving combustion technology which combusts ordinary combustion-supporting air after enriching oxygen. Under the same conditions, it can effectively reduce excess air coefficient, reduce flue gas, increase theoretical combustion temperature, increase production and save coke. However, the oxygen-enriched flow rate can not be increased indefinitely, otherwise too little flue gas can not meet the heat storage requirements of lattice bricks, it will be gratuitous.
2. a hot air piping system with reasonable lining, low stress and directional expansion is adopted.
这对高温长寿热风炉十分重要。热风管道为高炉送风，长期受到周期性变化的高温影响，容易发生管道烧红、漏风甚至变形受损，严重影响送风的温度和稳定性。为此，在结构设计时应合理布置管道拉杆和波纹补偿器，以减小应力对管道产生的影响: 一般需要在热风支管上以及主管上支管的两侧设置补偿器，主管端部根据需要另设补偿器; 设置导向和固定支座等措施使管道受到有限制的定向膨胀等；同时要保证这些设施不影响管道上阀门的安装和检修等工作。管道工作层一般选用耐热温度高、蠕变率低、抗热震性能好的低蠕变高铝质，在关键部位如热风管口、三岔口等应当采用组合砖砌筑结构，同时也要重视管道的隔热保温，保证整体内衬工作的稳定性和气密性。
This is very important for high temperature and long life hot stove. Hot air pipeline is the blast furnace air supply, which is affected by periodic high temperature for a long time. It is prone to red burning, air leakage and even deformation damage, which seriously affects the temperature and stability of the air supply. Therefore, in structural design, the tie rods and corrugated compensators should be reasonably arranged in order to reduce the influence of stress on the pipeline: generally, compensators should be installed on the hot air branch pipe and on both sides of the upper branch pipe of the main pipe, and compensators should be installed at the end of the main pipe according to the need; measures such as setting guide and fixed support should be taken to restrict the pipeline. Directional expansion, etc. at the same time, ensure that these facilities do not affect the installation and maintenance of valves on pipelines. Pipeline working layers are generally made of low creep and high aluminium with high heat resistance, low creep rate and good thermal shock resistance. Composite brick masonry structure should be adopted in key parts such as hot air pipe outlet and three forks. At the same time, attention should be paid to heat insulation of pipeline to ensure the stability and air tightness of the whole lining.
3. adopt top combustion type hot blast stove structure.
The steel shell structure of top-fired hot stove is uniform and symmetrical. Compared with internal combustion hot stove, under the same capacity of hot stove, the heat storage area can be increased by 25%-30%. The air distribution in the furnace is uniform, the heat transfer is symmetrical, the uniformity is good, and the heat efficiency is high, so the hot air temperature is high. At the same time, the external-fired hot stove occupies a large area. The disadvantages of high investment cost. Practice has proved that the top-fired hot blast stove can achieve high air temperature with lower vault temperature, and the working conditions of refractories have been significantly improved. It can achieve high air temperature and long service life at the same time.
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