CN1007431B

CN1007431B - blast furnace tuyere

Info

Publication number: CN1007431B
Application number: CN 88100068
Authority: CN
Inventors: 堀田裕久; 大野阳太郎; 松浦正博
Original assignee: NKK Corp
Current assignee: JFE Engineering Corp
Priority date: 1987-01-09
Filing date: 1988-01-09
Publication date: 1990-04-04
Also published as: JPS63171810A; CN88100068A

Abstract

The tuyere used for a blast furnace includes a water-cooled tuyere and a burner installed on the inner surface of the water-cooled tuyere. The burner consists of an inner tube, a middle tube and an outer tube, and the three tubes are basically coaxial. The inner tube is a coal powder supply channel, the oxygen supply channel is located between the inner tube and the middle tube, the flame temperature control gas supply channel at the front end of the tuyere is located between the middle tube and the outer tube, and a water-cooling jacket is installed on the outer side of the burner end.

Description

本发明涉及一种用于炼铁高炉风口的结构，特别是喷吹煤粉的高炉风口的结构。The invention relates to a structure for a blast furnace tuyere used in ironmaking, in particular to a blast furnace tuyere structure for injecting coal powder.

最近，为了改善高炉的生产率或为了利用高炉炉顶煤气作合成化学工业的原料，提出了用氧气作为喷吹气体主要组份的各种方法。如日本专利32323/77号公开了一种喷吹富氧和经再制的炉顶煤气的方法。在另一日本专利申请（公开号：159104/85）中也公开了一种方法，它通过风口吹入氧气和作为风嘴前端火焰温度控制剂的H₂O或CO₂，同时，再通过高炉中部吹入无N₂的气体。在该专利申请的说明书中，公开了生产每吨铁水可喷吹100Kg煤粉，但是没有说明喷吹煤粉的方法。况且，在高炉的现有技术中，煤粉要随适当的载气通过风口孔一起吹入。这样用先有技术的方法，要想大量地燃烧煤粉是困难的。Recently, in order to improve the productivity of the blast furnace or to utilize the top gas of the blast furnace as a raw material for the synthetic chemical industry, various methods using oxygen as a main component of the blowing gas have been proposed. Disclosed as No. 32323/77 of Japanese patent is a kind of method of injecting oxygen-enriched and through remanufactured top gas. A method is also disclosed in another Japanese patent application (publication number: 159104/85), which blows oxygen and H ₂ O or CO ₂ as a flame temperature control agent at the front of the tuyere through the tuyeres, and at the same time, passes through the blast furnace Gas without _N2 is blown into the middle. In the description of this patent application, it is disclosed that 100Kg of pulverized coal can be injected per ton of molten iron for production, but the method of pulverized coal injection is not described. Moreover, in the prior art of blast furnaces, pulverized coal is blown in through the tuyere holes together with an appropriate carrier gas. With the method of prior art like this, it is difficult to want to burn pulverized coal in a large amount.

本发明的目的是提供一种允许大量喷吹煤粉并能完全燃烧的风口。The object of the present invention is to provide a tuyere that allows a large amount of pulverized coal to be injected and can be completely burned.

根据本发明，高炉风口包括一个水冷风嘴和装在水冷风嘴内的烧嘴。According to the present invention, the blast furnace tuyere includes a water-cooled tuyere and a burner installed in the water-cooled tuyere.

附图的图面说明如下：The descriptions of the attached drawings are as follows:

图1为一剖面图，它表示的是本发明高炉风口的一实施例。Fig. 1 is a sectional view showing an embodiment of a blast furnace tuyere of the present invention.

现在参照附图1，介绍本发明高炉风口的实施例。在水冷风嘴1内面装有烧嘴2。烧嘴2包括内管3，中管4和外管5，该三管基本上同轴;还包括置于烧嘴2端部的水冷套9。煤粉供入通道6在内管3之内，氧气供入通道7在内管3和中间管4之间，风嘴前端火焰温度控制气体供入通道8在中管4和外管5之间。通过氧气通道7，吹入氧气体积占40%或更高的气体。通过风嘴前端火焰温度控制气体供入通道8，吹入由循环高炉煤气、CO₂和水蒸汽中任选的一种气体。水冷套9紧贴在与高炉内侧严格密封的水冷风嘴的内表面。在烧嘴2的端部，喷出口10要布置成使喷出的煤粉、氧气和风嘴前端火焰温度控制气体以充分混合的状态进入高炉。由于充分混合，煤粉完全燃烧。水冷风嘴1和水冷套9由冷水供入管11提供的水冷却。Referring now to accompanying drawing 1, introduce the embodiment of blast furnace tuyere of the present invention. A burner 2 is installed inside the water-cooled air nozzle 1 . The burner 2 includes an inner tube 3, a middle tube 4 and an outer tube 5, the three tubes are basically coaxial; a water cooling jacket 9 placed at the end of the burner 2 is also included. The pulverized coal supply channel 6 is inside the inner tube 3, the oxygen supply channel 7 is between the inner tube 3 and the middle tube 4, the flame temperature control gas supply channel 8 at the front end of the tuyere is between the middle tube 4 and the outer tube 5 . Through the oxygen channel 7, a gas with an oxygen volume of 40% or more is blown in. The flame temperature at the front end of the tuyere is used to control the gas supply channel 8, and a gas selected from circulating blast furnace gas, CO ₂ and steam is blown in. The water-cooling jacket 9 is close to the inner surface of the water-cooling air nozzle tightly sealed with the inside of the blast furnace. At the end of the burner 2, the ejection port 10 should be arranged so that the ejected pulverized coal, oxygen and the flame temperature control gas at the front end of the tuyere enter the blast furnace in a fully mixed state. Due to the thorough mixing, the pulverized coal burns completely. The water cooling air nozzle 1 and the water cooling jacket 9 are cooled by the water provided by the cold water supply pipe 11 .

其次，现在说明把水冷风嘴1和水冷套9并行安装在烧嘴2顶部的好处。在把氧气和风嘴前端火焰温度控制气体吹入风口的操作中出故障的可能性较小，而在把氧气、风嘴前端火焰温度控制气体和煤粉一起吹入风口的操作中就易于出问题。在这方面，并行风口结构能把产生问题的可能性限制在最小的程度或当问题发生时能以最短的时间准确地用一烧嘴取替有故障的烧嘴。Secondly, the benefit of installing the water-cooled air nozzle 1 and the water-cooled jacket 9 in parallel on the top of the burner 2 will now be described. It is less likely to fail in the operation of blowing oxygen and the flame temperature control gas at the front end of the tuyeres into the tuyeres, but it is easy to cause problems in the operation of blowing oxygen, the flame temperature control gas at the front end of the tuyeres and coal powder into the tuyeres together . In this regard, the parallel tuyere structure can limit the possibility of problems to a minimum or when a problem occurs, it can accurately replace a faulty burner with a burner in the shortest time.

最后，说明使用本发明的具有并行结构风口的操作方法。铁矿石和焦炭通过炉顶装入高炉。氧气体积占40%或更高的气体、风嘴前端火焰温度控制气体和煤粉通过安装在高炉下部的风口吹入高炉。预热气体通过安装在炉身上的开炉用进风口进入高炉并预热加入高炉的炉料。通过上述方法，由于氧气是通过风口加入的，所以焦炭和煤粉能完全燃烧，由此而产生的还原气体熔化并还原铁矿石成铁水和渣。Finally, the operation method using the tuyere with parallel structure of the present invention is described. Iron ore and coke are charged into the blast furnace through the roof. The gas whose oxygen volume accounts for 40% or more, the flame temperature control gas at the front end of the tuyeres and the pulverized coal are blown into the blast furnace through the tuyeres installed in the lower part of the blast furnace. The preheating gas enters the blast furnace through the opening air inlet installed on the furnace body and preheats the charge fed into the blast furnace. By the above method, since oxygen is added through the tuyeres, coke and pulverized coal can be completely combusted, and the resulting reducing gas melts and reduces iron ore into molten iron and slag.

如前所述，当按照惯例把具有本发明的结构的风口用于喷吹煤粉操作时，风口不仅具有使煤粉完全燃烧的作用，而且还能有利于快速而准确地更换发生故障的氧气烧嘴。As mentioned above, when the tuyere with the structure of the present invention is used for pulverized coal injection operation according to the usual practice, the tuyere not only has the effect of completely burning the pulverized coal, but also facilitates the rapid and accurate replacement of the failed oxygen. burner.

Claims

1, a kind of blast-furnace tuyere comprises a water-cooled tuyere (1) and is installed in the burner (2) of water-cooled tuyere (1) inner face, it is characterized in that described burner (2) comprising:

A) an interior pipe (3), pipe (4) and an outer tube (5) in one, this three pipe is coaxial basically, in the internal space of pipe (3) constitute one be used to infeed coal dust in infeed passage (6), in space between pipe (3) and the middle pipe (4) constitute a centre that is used to infeed oxygen and infeed passage (7), the space formation one between middle pipe (4) and the outer tube (5) is used to infeed the outer passage (8) that infeeds of tuyere (1) front end flame temperature pilot-gas.

B) water jacket (9) outside burner (2) end,

C) make the ejiction opening (10) that enters blast furnace by coal dust, oxygen and tuyere (1) the front end flame temperature pilot-gas of burner (2) end ejection with the thorough mixing state.