WO2008037132A1 - A process for iron smelting in blast furnace using purified oxygen and coal gas and its device - Google Patents

Abstract

A process for iron smelting in blast furnace using purified oxygen and coal gas and its device. The process comprises the following steps: adding ore material composed of agglomeration, basic sintered ore, coke and flux into a blast furnace from its roof, in which the amount of coke is 170-200 kg per ton of iron; simultaneously blowing purified oxygen into the blast furnace, in which the amount of purified oxygen is 120-200 Nm3 per ton of molten iron; simultaneously blowing coal gas which is preheated and pressurized by a ball-type hot blast furnace into the blast furnace to reduce metallic ore, in which the temperature of the coal gas is 900-1150 °C, the pressure of the coal gas is 0.1-0.6 MPa; purifying and cooling the coal gas generated from reduction by a dust removing system, transporting the gas to a top pressure electric generator through pipelines to recycle it, and collecting it into a gas cylinder or recycling it directly. The process has a greatly increased productivity, in which the usage factor of blast furnace is up to 6-8 tons of iron/m3 ⋅ D, the consumption of flux reduces 2/3, the amount of slag reduces 2/3, the overall consumption per ton of iron could be 492 kgCE/t, and coal gas from the furnace roof could be recycled and used to generate electricity.

Description

 Pure oxygen gas blast furnace ironmaking process and equipment Technical field:

 The invention relates to a blast furnace ironmaking process in the iron and steel metallurgy industry, which mainly uses pure oxygen instead of blast furnace blast, and uses high-hydrogen gas to preheat the blast furnace into the blast furnace to replace most of the coke ironmaking process.

 At present, 3/4 of the world's pig iron and steelmaking hot metal are produced by the traditional blast furnace ironmaking process. In modern times, the traditional blast furnace ironmaking process uses new technologies such as oxygen enrichment, coal injection, and large-scale production. Contemporary blast furnace ironmaking technology has made great progress.

 Because of the development of high-purity water gas production technology (see patent 200610045968.1) and the development of gas, coke oven gas and natural gas reforming technology, industrial production of high-quality, high-purity, high-hydrogen, low-cost reducing gas processes has matured, so the development of the above gas The pure oxygen blast furnace ironmaking process, which is the main reducing agent, has been achievable. ' ,

 The process and equipment for purifying the pure oxygen gas blast furnace with preheated blast by using pure gas as the reducing agent was not found.

Summary of the invention:

 The object of the present invention is to provide a new technological transformation process and equipment for the traditional blast furnace ironmaking process, namely "pure oxygen gas blast furnace ironmaking process and equipment".

The technical solution adopted is - The pure oxygen gas blast furnace iron making process includes the following processes:

 1. The ore material consisting of pellets, alkaline sinter, coke, and flux is sent from the top of the furnace to the blast furnace, wherein each ton of molten iron is equipped with coke 170-200kg;

2. The pure oxygen is blown into the blast furnace, and the amount of pure oxygen is 120-200 Nm ³ per ton of molten iron. At the same time, the gas is pressurized into the blast furnace by the gas pressurized by the small-ball gas hot blast stove to reduce the metal ore. The temperature of the preheated gas is 900-1150 ° C, and the gas pressure is 0.1-0.6 MPa;

 3. The gas produced by the reduction is purified and cooled by the dust removal system, sent to the residual pressure generating device through the pipeline, reused, and then recycled to the gas tank or directly recycled.

 Pure oxygen gas blast furnace ironmaking equipment, including loading system, blast furnace gravity dust collector, ceramic tube dust collector, bag dust removal device, carbon dioxide pressure swing adsorption device, residual pressure power generation device, which is characterized by opening around the blast furnace belly There are a plurality of gas injection ports and a plurality of oxygen injection ports, and a gas preheating small ball type hot blast stove is arranged outside the blast furnace furnace, and the gas ball type thermal λ furnace passes through the pipeline and a plurality of gas injection ports opened around the blast furnace belly The gas-explosion-proof device is installed on the pipeline at the outlet end of the gas preheating ball-type hot blast stove, and a plurality of oxygen injection ports opened on the belly of the blast furnace are connected to the oxygen source through the pipeline. ,

The gas generated by the reaction process of the present invention is purified and cooled by a gravity dust remover, a ceramic tube type dust remover, a bag dust removal device, and a carbon dioxide pressure swing adsorption device. The purified and cooled top gas is passed through the pipeline to the residual pressure power generation unit for reuse and recovered to the gas tank, and can also be recycled. After adopting the above process, the productivity of the blast furnace is greatly improved, the utilization coefficient of the blast furnace can reach 6-8 tons of iron/m ³ · D, the flux consumption is reduced by 2/3, and the slag amount is reduced by 2/3, per ton. The comprehensive consumption of iron can reach 492kgCE/t, and the top gas can recover electricity.

BRIEF DESCRIPTION OF THE DRAWINGS:

 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a system diagram of the apparatus of the present invention.

detailed description:

 Embodiment 1

 Pure oxygen gas blast furnace iron making process:

Pellet ore, alkaline sinter, coke, and flux are fed into the blast furnace from the top of the furnace, wherein 180 _{kg of} coke per ton of iron is added _; then pure oxygen is bubbled into the blast furnace, and at the same time, the ball is heated by the hot blast stove. The gas is injected into the blast furnace to directly reduce the pellets and iron-containing raw materials. The oxygen per ton of molten iron is 130Nm ³ , and the gas is preheated to 1000 ° C - 1100 ° C by a ball-type hot blast stove. The gas pressure is 0.2 MPa. The gas generated by the reaction process is purified and cooled by a gravity dust remover, a ceramic tube type dust remover, a bag filter and a carbon dioxide pressure swing adsorption device, and the purified and cooled top gas is passed through the pipeline to the residual pressure power generation device for reuse. It can be recycled to the gas tank. Of course, it can also be recycled.

Pure oxygen gas blast furnace iron making equipment, including feeding device 1, blast furnace 2, gravity dust collector 4, ceramic tube dust collector 5, bag filter 6, carbon dioxide pressure swing adsorption device 7, residual pressure power generation device 8, its structural characteristics a plurality of gas injection ports are respectively opened on the upper and lower sides of the blast furnace 1 and a plurality of oxygen injection ports, a gas feed coil 9 and an oxygen feed coil 3 are respectively disposed at a periphery of the abdomen, and a plurality of gas injection ports are respectively connected to the gas feed coil 9 and the plurality of oxygen injection ports are respectively connected. The lead pipe is connected to the oxygen feeding coil 3; a gas preheating small ball type hot blast stove 11 is disposed outside the blast furnace 2, and the gas preheating small ball type hot blast stove 11 is fed into the coil 9 through the gas pipe 12 and the gas. In conjunction with the gas pipe 12, a gas explosion-proof safety device 10 is installed.

 Embodiment 2

 Pure oxygen gas blast furnace iron making process:

Pellet ore, alkaline sinter, coke, and flux are fed into the blast furnace from the top of the furnace, wherein 190 kg of coke per ton of iron is added; then pure oxygen is bubbled into the blast furnace, and at the same time, the ball is heated by the ball-type hot blast stove. The gas is injected into the blast furnace to directly reduce the pellets and iron-containing raw materials. The oxygen content per ton of molten iron is 160Nm ³ , and the gas is preheated to 1000 ° C - 1100 ° C by a ball type hot blast stove, and the gas pressure is 0.3. MPa. The gas generated by the reaction process is purified and cooled by a gravity dust remover, a ceramic tube type dust remover, a bag filter and a carbon dioxide pressure swing adsorption device, and the purified and cooled top gas is passed through the pipeline to the residual pressure power generation device for reuse. It can be recycled to the gas tank. Of course, it can also be recycled.

 Embodiment 3

 Pure oxygen gas blast furnace iron making process:

Pellet ore, alkaline sinter, coke, and flux are sent from the top of the furnace to the blast furnace, wherein 200 kg of coke per ton of iron is added; then pure oxygen is bubbled into the blast furnace, and at the same time, the ball type hot blast stove is pressurized. The hot gas is injected into the blast furnace to directly reduce the pellets and iron-containing raw materials. The oxygen content per ton of molten iron is 190 Nm ³ , and the gas is preheated to 1000 ° C - 1100 ° C by a ball-type hot blast stove. It is 0:5 MPa. The gas generated by the reaction process is purified and cooled by a gravity dust remover, a ceramic tube type dust remover, a bag filter and a carbon dioxide pressure swing adsorption device, and the purified and cooled top gas is passed through the pipeline to the residual pressure power generation device for reuse. It can be recycled to the gas tank. Of course, it can also be recycled.

Claims

Rights request 1. Pure oxygen gas blast furnace ironmaking process, which is characterized by the following processes:  A. The mineral material consisting of pellets, alkaline sinter, coke, and flux is taken from the top of the furnace: into the blast furnace, in which 170-200 kg of coke per ton of iron; B. Simultaneously inject pure oxygen into the blast furnace. The amount of pure oxygen is 120-200Nm ³ per ton of molten iron _. At the same time, the gas is pressurized into the blast furnace by the gas heated by the small ball gas hot blast stove to reduce the metal ore. The temperature of the preheated gas is 900 ° C - 1150 ° C, and the gas pressure is 0.1 - 0.6 MPa;  C. The gas produced by the reduction is purified and cooled by the dust removal system, sent to the residual pressure generating device through the pipeline, reused, and then recycled to the gas tank or directly recycled.  2. Pure oxygen gas blast furnace ironmaking equipment, including feeding system, blast furnace gravity dust collector, ceramic tube dust collector, bag dust removal device, carbon dioxide pressure swing adsorption device, residual pressure power generation device, which is characterized by around the blast furnace belly a plurality of gas injection ports and a plurality of oxygen injection ports are opened, and a gas preheating small ball type hot blast stove is arranged outside the blast furnace furnace, and the gas preheating small ball type hot blast stove is opened through the pipeline and the blast furnace belly The gas injection port is connected to each other; the gas explosion-proof device is installed on the pipeline at the outlet end of the gas preheating ball type hot blast stove, and a plurality of oxygen injection ports opened on the belly of the blast furnace are connected to the oxygen source through the pipeline. 3. The pure oxygen gas blast furnace ironmaking process according to claim 1, wherein: the pellets, the alkaline sintered ore, the coke, and the flux are fed from the furnace top into the blast furnace, wherein each ton of iron is cokeed. Charcoal 190kg; then pure oxygen is blown into the blast furnace, and at the same time, the gas preheated by the ball-type hot blast stove is injected into the blast furnace to directly reduce the pellets and the iron-containing raw materials, and the oxygen content per ton of molten iron is 160 Nm ³ The gas is preheated to 1000 ° C - 1100 ° C by a ball type hot blast stove, and the gas pressure is 0.3 MPa; ^ The gas generated by the process is subjected to gravity dust remover, ceramic tube type dust collector and bag filter and carbon dioxide The pressure adsorption device performs purification and cooling, and the top gas purified and cooled is passed through a pipeline to a residual pressure power generation device for reuse, and then recovered to the gas tank. Of course, it can also be recycled. The pure oxygen gas blast furnace ironmaking process according to claim 1, wherein: the pellets, the alkaline sintered ore, the coke, and the flux are fed into the blast furnace from the top of the furnace, wherein 200 kg of coke per ton of iron is used; Then, pure oxygen is blown into the blast furnace, and at the same time, the gas preheated by the ball type hot blast stove is injected into the blast furnace to directly reduce the pellets and the iron-containing raw materials, and the oxygen content per ton of molten iron is 190 Nm ³ . The ball type hot blast stove is preheated to 1000 ° C - 1100 ° C, and the gas pressure is 0.5 MPa. The gas generated by the reaction process is purified and cooled by a gravity dust remover, a ceramic tube type dust remover, a bag filter and a carbon dioxide pressure swing adsorption device, and the purified and cooled top gas is passed through the pipeline to the residual pressure power generation device for reuse. It can be recycled to the gas tank. Of course, it can also be recycled. '