CN-116751612-B - Three-fork structure of rising gas pipeline of COREX (continuous oxygen evolution) melting gasification furnace

Abstract

The invention discloses a three-fork structure of a rising gas pipeline of a COREX melting gasification furnace, which belongs to the technical field of refractory materials for metallurgy and comprises a first pipeline section, a second pipeline section and a third pipeline section, wherein the first pipeline section is positioned at the top of the rising gas pipeline, the first pipeline section adopts a vault type structure, the second pipeline section is positioned at the periphery of the rising gas pipeline, the second pipeline section adopts an insulating layer as a bottom layer and adopts refractory bricks as working face bricks, the third pipeline section is configured into a bent structure, and the third pipeline section comprises special-shaped structure bricks and pipeline bricks which are mutually spliced. According to the invention, through the combination of the light refractory castable and the refractory clay brick, the bearing capacity of the pipeline can be improved, the service life of the gas pipeline three-fork is prolonged, the safe production and the driving protection of enterprises are ensured, and the high-proportion gas is generated and used.

Inventors

• CHENG LI
• JIN FENG
• FU YANPENG

Assignees

• 中钢设备有限公司

Dates

Publication Date

20260512

Application Date

20230706

Claims (4)

1. 1. The triple-fork structure of the rising gas pipeline of the COREX melting gasification furnace is characterized by comprising a first pipeline section, a second pipeline section and a third pipeline section, wherein the first pipeline section is positioned at the top of the rising gas pipeline, the first pipeline section adopts a vault type structure, groove joint design is adopted between top bricks of the first pipeline section, the second pipeline section is positioned at the periphery of the rising gas pipeline, the second pipeline section adopts an insulating layer as a bottom layer and adopts refractory clay bricks as working bricks, the third pipeline section is configured into a bent structure, and the third pipeline section comprises special-shaped structure bricks and pipeline bricks which are mutually spliced; the refractory clay bricks in the second pipeline section are spliced and fixed in a snap-in manner; the primary and secondary buckles on the refractory clay bricks are respectively provided with at least one protruding structure and at least one groove structure; The second pipeline section is connected with a hot cyclone dust collector, and a mode of pouring light refractory castable and then laying refractory clay bricks is adopted at the upper part of the pipeline in the direction of the gas flow and the hot cyclone dust collector; the light refractory castable comprises Al 2 O 3 、Fe 2 O 3 、SiO 2 and CaO, and the linear change rate of the light refractory castable is 1400 DEG C Reaching-1.0 to 0 percent under 24 hours; The refractory clay brick comprises Al 2 O 3 and Fe 2 O 3 , and the linear change rate of the refractory clay brick is 1400 DEG C Reaching-0.1 to +0.1% in 2 hours.
2. 2. The COREX melter-gasifier rising gas conduit triple-fork structure according to claim 1, wherein an outer steel cylinder structure is arranged around the second conduit section.
3. 3. The structure of the three-fork of the rising gas pipe of the COREX melter-gasifier according to claim 1, wherein the thickness of the refractory clay brick of the second pipe section is 230mm or more.
4. 4. The COREX melter-gasifier rising gas pipe triple-fork structure according to claim 1, wherein a manhole is connected to the second pipe section in a vertical direction, the manhole comprises a light refractory castable layer, a refractory clay brick layer, and a heat insulating brick layer sequentially arranged, wherein the heat insulating brick layer comprises Al 2 O 3 and Fe 2 O 3 , and a linear change rate of the heat insulating brick layer is 1300 °c Reaching-1.0 to 0 percent under 12 hours.

Description

Three-fork structure of rising gas pipeline of COREX (continuous oxygen evolution) melting gasification furnace Technical Field The invention belongs to the technical field of refractory materials for metallurgy, and particularly relates to a three-fork structure of a rising gas pipeline of a COREX melt gasification furnace. Background The method has the advantages of short process flow, low investment, low production cost, less pollution, and the quality of produced molten iron being comparable with that of blast furnace molten iron, and can produce sponge iron in a shaft furnace by utilizing discharged process gas to replace high-quality waste steel supply electric furnace steelmaking. COREX smelting reduction ironmaking technology is a non-blast furnace ironmaking technology aimed at reducing coking coal resource dependence. The technology is characterized in that after raw materials (pellets, sintered ores, fluxes and the like) enter a reduction shaft furnace, the raw materials containing iron are preheated and prereduced through reduction gas in the furnace, then the raw materials are sent into a gasification furnace, final reduction, melting and removal of molten iron impurities are realized under the condition of total oxygen smelting, finally molten iron and gas are produced, and after hot cyclone dust removal, the gas is sent into the reduction shaft furnace to be used as reduction gas. The top gas generated by the shaft furnace is sprayed into the air port of the gasification furnace after decarburization and purification, thereby realizing the self-circulation process route of the gas of the European smelting furnace. The COREX process flow is shown in figure 1. In order to improve the use proportion of the non-coking coal to be more than 60%, the vault of the gasifier increases the gas making capability, reduces the comprehensive molten iron cost, and ensures that the reduction gas is blown into the pre-reduction and smelting area of the shaft furnace. According to the characteristics of COREX smelting, the structure of raw materials is set, the adaptability of raw materials is expanded, the technology of gasification furnace vault coal injection and gas production is creatively developed, the problem of clean and efficient use of non-coking coal is solved, the high-concentration metallurgical gas is recycled, and the utilization rate of COREX top gas is improved. However, a large amount of gas is generated, the high temperature is 1100 ℃, the high pressure is 0.35MPa, and the high dust concentration gas flow can not meet the requirements of the gas pipeline refractory material, especially the three-fork region refractory material of the gas rising pipeline after the improvement of the process, no matter the structure and the strength of the refractory material are adopted, the scouring resistance is not met. The part is provided with a convolution area, and the spray paint originally designed is convenient to construct, reduces implementation difficulty, is low in erosion resistance and scouring resistance, causes serious paint falling, has a service cycle of less than 2 years, is frequently replaced in a short time, influences yield and also has hidden danger to safety. Therefore, a new refractory structure is sought, the strength of the refractory is improved, the stable and smooth operation of the process is ensured, the reliable operation with long service life is realized, and the method becomes the key for solving the problem. Disclosure of Invention The invention aims to provide a three-fork structure of a rising gas pipeline of a COREX melting gasification furnace, which can improve the bearing capacity of the pipeline, prolong the service life of the three-fork of the rising gas pipeline of the COREX melting furnace, provide protection for the safe production and driving of enterprises and provide guarantee for the generation and use of high-proportion gas. The invention provides a three-fork structure of a rising gas pipeline of a COREX melting gasification furnace, which comprises a first pipeline section, a second pipeline section and a third pipeline section, wherein the first pipeline section is positioned at the top of the rising gas pipeline, the first pipeline section adopts a vault type structure, the second pipeline section is positioned at the periphery of the rising gas pipeline, the second pipeline section adopts a heat insulation layer as a bottom layer and adopts refractory bricks as working face bricks, the third pipeline section is configured into a bent structure, and the third pipeline section comprises special-shaped structural bricks and pipeline bricks which are mutually spliced. Furthermore, refractory bricks in the second pipeline section are spliced and fixed in a snap-on mode. Further, the primary and secondary buckles on the refractory bricks are respectively provided with at least one protruding structure and at least one groove structure. Further, the secon