阅读说明：本技术 一种高炉机前富氧工艺 (Oxygen enrichment process in front of blast furnace ) 是由 焦军 邢胜利 郭祥军 韩迅锋 于 2019-02-23 设计创作，主要内容包括：本发明公开了一种高炉机前富氧工艺,包括制氧空分分馏塔、限流阀、气体混合器、鼓风机和高炉。制氧空分分馏塔通过管道与鼓风机吸气侧固定的气体混合器连接,制氧空分分馏塔与气体混合器之间的管道上固定有限流阀,气体混合器与鼓风机吸气侧连通,鼓风机出气侧通过管道与高炉连通。本发明的有益效果是在维持鼓风机风量不变,将制氧空分分馏塔产生的低压氧气从鼓风机机前吸入侧的气体混合器内与空气混合,从而使进入鼓风机中的气体氧含量增加,以达到高炉富氧鼓风,节省了大量的电耗,投资少,能耗低,而且更安全可靠,避免了高压氧因种种原因而导致的燃烧、爆炸等危险因素。(The invention discloses a blast furnace front oxygen enrichment process, which comprises an oxygen generation air separation fractionating tower, a flow limiting valve, a gas mixer, a blower and a blast furnace. The oxygen-making air separation fractionating tower is connected with a gas mixer fixed on the air suction side of the air blower through a pipeline, a flow limiting valve is fixed on the pipeline between the oxygen-making air separation fractionating tower and the gas mixer, the gas mixer is communicated with the air suction side of the air blower, and the air outlet side of the air blower is communicated with the blast furnace through a pipeline. The invention has the advantages that the air quantity of the air blower is kept unchanged, the low-pressure oxygen generated by the oxygen-making air separation fractionating tower is mixed with the air from the air mixer at the front suction side of the air blower, so that the oxygen content of the gas entering the air blower is increased, the purpose of oxygen-enriched air blowing of the blast furnace is achieved, a large amount of power consumption is saved, the investment is low, the energy consumption is low, the safety and the reliability are higher, and the dangerous factors such as combustion, explosion and the like caused by various reasons of the high-pressure oxygen are avoided.)

1. The utility model provides an oxygen boosting technology before blast furnace machine, includes the empty fractionating tower that divides of oxygen generation, restriction valve, gas mixer, air-blower and blast furnace, its characterized in that: the air separation fractionating tower for oxygen production is connected with a fixed gas mixer on the air suction side of the air blower through a pipeline, a flow limiting valve is fixed on the pipeline between the air separation fractionating tower for oxygen production and the gas mixer, the gas mixer is communicated with the air suction side of the air blower, and the air outlet side of the air blower is communicated with the blast furnace through a pipeline, and the method comprises the following steps:

the method comprises the following steps: oxygen generated by the oxygen generation air separation fractionating tower enters the gas mixer through a pipeline, the oxygen passes through the flow limiting valve before entering the gas mixer, the flow limiting valve is connected with a PLC control system cabinet in the electric chamber, the PLC control system cabinet controls the opening degree of the flow limiting valve, and the opening degree of the flow limiting valve is adjusted according to the air entering amount, so that the oxygen passing amount is controlled;

step two: oxygen enters the gas mixer through the flow limiting valve, a rotating fan blade is arranged in the gas mixer, the rotating fan blade rotates under the driving of the micro motor, an air port is formed in the gas mixer, external air enters the gas mixer at a constant speed under the action of the air blower, and the oxygen and the air are mixed under the driving of the rotating fan blade;

step three: the mixed gas is sucked out from the gas mixer by the gas suction side of the blower, and the mixed gas is conveyed into the blast furnace from the gas outlet side of the blower through a pipeline after passing through the blower and is combusted in the blast furnace in an oxygen-enriched state;

step four: the blast furnace is provided with a temperature sensor which is connected with a PLC control system cabinet in an electric chamber to reflect the temperature of the blast furnace in real time, when the temperature of the blast furnace is abnormal, an electromagnetic valve of a nitrogen pipeline connected with the gas mixer is opened, nitrogen is filled into the gas mixer, the oxygen content is reduced, and the temperature of the blast furnace is adjusted.

2. The pre-machine oxygen enrichment process of the blast furnace as claimed in claim 1, characterized in that: the oxygen generated by the oxygen generation air separation fractionating tower is 15kpa of low-pressure oxygen.

3. The pre-machine oxygen enrichment process of the blast furnace as claimed in claim 1, characterized in that: the oxygen content in the mixed gas in the gas mixer is between 21 and 25 percent.

4. The pre-machine oxygen enrichment process of the blast furnace as claimed in claim 1, characterized in that: an oxygen storage device is arranged between the oxygen production air separation fractionating tower and the gas mixer.

Technical Field

The invention relates to the technical field of steel rolling processes, in particular to a blast furnace front oxygen enrichment process.

Background

Steel is an indispensable important resource in both floor construction and railway construction. There are basically two processes for manufacturing steel, one of which is important for producing pig iron, and blast furnace iron-making is the iron-making process mainly used in china. Blast furnace iron making uses coke, iron-containing ore (natural rich lump ore, sinter and pellet) and flux (limestone and dolomite) to continuously produce liquid pig iron in a vertical reactor, i.e. a blast furnace.

Oxygen enrichment is to collect oxygen in air by physical or chemical method, so that the content of oxygen enriched in the collected air is more than or equal to 21%. The combustion technology of carbon in oxygen-enriched air is based on the existing blast furnace ironmaking system, high-purity oxygen is used to replace combustion-supporting air, and the combustion technology of flue gas circulation is used as an auxiliary combustion technology, so that the method has the advantages of low relative cost, easy large-scale production, capacity of modifying stock units and the like.

The traditional blast furnace iron-making system is used for enriching oxygen behind a blast furnace machine, an oxygen compressor is required to be arranged, the oxygen compressor can generate a large amount of power consumption, the investment is high, the energy consumption is high, the safety and the reliability are high, and high-pressure oxygen causes combustion and explosion due to various reasons, and more dangerous factors exist.

Disclosure of Invention

The invention aims to provide a process for enriching oxygen in front of a blast furnace, which has the advantages of saving a large amount of power consumption, having less investment, low energy consumption, being safer and more reliable, avoiding dangerous factors such as combustion, explosion and the like caused by various reasons of high-pressure oxygen, and solving the problems of a large amount of power consumption, more investment, high energy consumption, being unsafe and reliable, and more dangerous factors caused by various reasons of high-pressure oxygen due to combustion and explosion after the blast furnace is operated.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an oxygen boosting technology before blast furnace machine, is divided fractionating tower, restriction valve, gas mixer, air-blower and blast furnace including making oxygen, makes oxygen and divides the fractionating tower to pass through the pipeline and is connected with the fixed gas mixer of air-blower side of breathing in, makes oxygen and divides to be fixed restriction valve on the pipeline between fractionating tower and the gas mixer, and gas mixer and air-blower side intercommunication of breathing in, the air-blower side of giving vent to anger is through pipeline and blast furnace intercommunication, includes following step:

the method comprises the following steps: oxygen generated by the oxygen generation air separation fractionating tower enters the gas mixer through a pipeline, the oxygen passes through the flow limiting valve before entering the gas mixer, the flow limiting valve is connected with a PLC control system cabinet in the electric chamber, the PLC control system cabinet controls the opening degree of the flow limiting valve, and the opening degree of the flow limiting valve is adjusted according to the air entering amount, so that the oxygen passing amount is controlled;

step two: oxygen enters the gas mixer through the flow limiting valve, a rotating fan blade is arranged in the gas mixer, the rotating fan blade rotates under the driving of the micro motor, an air port is formed in the gas mixer, external air enters the gas mixer at a constant speed under the action of the air blower, and the oxygen and the air are mixed under the driving of the rotating fan blade;

step three: the mixed gas is sucked out from the gas mixer by the gas suction side of the blower, and the mixed gas is conveyed into the blast furnace from the gas outlet side of the blower through a pipeline after passing through the blower and is combusted in the blast furnace in an oxygen-enriched state;

step four: the blast furnace is provided with a temperature sensor which is connected with a PLC control system cabinet in an electric chamber to reflect the temperature of the blast furnace in real time, when the temperature of the blast furnace is abnormal, an electromagnetic valve of a nitrogen pipeline connected with the gas mixer is opened, nitrogen is filled into the gas mixer, the oxygen content is reduced, and the temperature of the blast furnace is adjusted.

Preferably, the oxygen produced by the oxygen production air separation fractionating tower is 15kpa of low pressure oxygen.

Preferably, the oxygen content of the mixed gas in the gas mixer is between 21% and 25%.

Preferably, an oxygen storage device is arranged between the oxygen production air separation fractionating tower and the gas mixer.

Compared with the prior art, the invention has the following beneficial effects: a kind of oxygen enrichment process before the blast furnace machine, maintain the blast blower air quantity unchanged, mix the low-pressure oxygen that the air separation fractionating tower produces with the air from the air mixer of the air blower machine front suction side, thus make the content of oxygen of gas entering the blast blower increase, in order to reach the blast furnace oxygen enrichment blast, change the traditional machine after the oxygen enrichment is large, the energy consumption is high and the situation of the great potential safety hazard, the investment is small, the energy consumption is low; the current-limiting measure is adopted to ensure that the concentration of oxygen-enriched air in front of the machine is not more than 25 percent, nitrogen spraying protection is carried out according to the temperature and the oxygen source is cut off urgently, so that the safety is ensured, and the dangerous factors such as combustion, explosion and the like caused by various reasons of high-pressure oxygen are avoided.

Drawings

FIG. 1 is a schematic diagram of the process of oxygen enrichment before the blast furnace.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.