Composite low-carbon ironmaking method based on blast furnace blowing coke oven coal gas

A coke oven gas and blast furnace technology, applied in the field of composite low-carbon ironmaking, can solve problems such as strong dependence on coke and coking coal resources, low recycling rate of resources and energy, gaps in energy consumption and carbon emissions, and improve existing operations , optimize energy conversion, and reduce carbon dioxide emissions

Inactive Publication Date: 2019-09-17
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Blast furnace ironmaking, as the main steel production process today, has a low resource and energy recycling rate, strong dependence on coke and coking coal resources, and serious environmental pollution
In addition, the energy consumption of the blast furnace process in steel production is the largest, accounting for about 49%; carbon dioxide emissions are also the largest, accounting for about 53%. There is still a big gap between energy consumption and carbon emissions compared with advanced steel-producing countries

Method used

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  • Composite low-carbon ironmaking method based on blast furnace blowing coke oven coal gas
  • Composite low-carbon ironmaking method based on blast furnace blowing coke oven coal gas
  • Composite low-carbon ironmaking method based on blast furnace blowing coke oven coal gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one (conventional blast furnace operation)

[0037] In this example:

[0038] The TFe content of the sintered ore is 57.85%, its main chemical composition is shown in Table 1, its drum index is 72%, and the low-temperature reduction pulverization index RDI +3.15 80%.

[0039] The pellet TFe content is 63.42%, its chemical composition is shown in Table 2, its compressive strength is 2778N, and its reduction expansion index RSI is 14%.

[0040] The TFe content of the lump ore is 63.2%, and its chemical composition is shown in Table 3.

[0041] The chemical composition of the hot-pressed iron coke is shown in Table 4. Its compressive strength is 5315N, its reactivity is 44%, and its post-reaction strength is 37%.

[0042] Industrial analysis of coke is shown in Table 5, its sulfur content S t,d 0.78%, crushing strength M 25 89.50%, abrasion resistance M 10 is 6.20%, reactive CRI is 24.80%, and post-reactive strength CSR is 65.30%.

[0043] Table 1 Sinter ...

Embodiment 2

[0057] Embodiment two (injection 50m 3 / tHM coke oven gas)

[0058] Using the raw fuel conditions such as sinter, pellets, lump ore and coke in Example 1, the sinter, pellets and lump ore are mixed evenly and then added to the blast furnace to form an ore layer, and the coke in Table 5 is added to the blast furnace to form Coke layers, ore layers and coke layers are alternately formed in the furnace and blast furnace smelted. The mass percentages of sintered ore, pellet ore and lump ore in the ore layer are 80%: 8%: 12%. The hot air temperature is 1179°C, and the blast humidity is 19.29g / m 3 , The oxygen enrichment rate is 9.98%.

[0059] Jet 50m 3 Table 7 shows the main operating indicators of blast furnace smelting 1 ton of molten iron under the condition of / tHM coke oven gas. The ore coke ratio is 4.758, the pig iron output is 4740t, the coke ratio is 322kg / tHM, the coal ratio is 135kg / tHM, the fuel ratio is 457kg / tHM, the carbon emission is 356kg / tHM, the slag ratio ...

Embodiment 3

[0062] Embodiment three (spray 50m 3 / tHM coke oven gas - tuyere injection 273m 3 / tHM furnace top circulation gas)

[0063] Using the raw fuel conditions such as sinter, pellets, lump ore and coke in Example 1, the sinter, pellets and lump ore are mixed evenly and then added to the blast furnace to form an ore layer, and the coke in Table 5 is added to the blast furnace to form Coke layers, ore layers and coke layers are alternately formed in the furnace and blast furnace smelted. The mass percentages of sintered ore, pellet ore and lump ore in the ore layer are 80%: 8%: 12%. The hot air temperature is 1179°C, and the blast humidity is 19.29g / m 3 , the oxygen enrichment rate is 38.85%.

[0064] Jet 50m 3 / tHM coke oven gas - tuyere injection 273m 3 Table 8 shows the main operating indicators of blast furnace smelting 1 ton of molten iron under the condition of / tHM furnace top circulating gas (denoted as COI50-TI273). The ore coke ratio is 5.04, the pig iron output is ...

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Abstract

The invention provides a composite low-carbon ironmaking method based on blast furnace blowing coke oven coal gas. The method takes a blast furnace as smelting equipment, ore layers and coke layers are taken as furnace charge, the furnace charge is loaded into the blast furnace from the top of the blast furnace, and the ore layers and the coke layers are alternately arranged inside the blast furnace; and the coke oven coal gas is blown at a blast furnace tuyere, meanwhile, two sections of blowing at a furnace top circulating coal gas tuyere and a furnace body are carried out, then blast furnace smelting is carried out by adopting high oxygen enrichment, hot air and coal injection operation, and finally molten iron and furnace slag are obtained. According to the method, the blast furnace smelting efficiency can be improved, the energy conversion and utilization inside the blast furnace can be optimized, the coke ratio can be reduced to the maximum extent, and the emission of carbon dioxide can be reduced.

Description

[0001] Technical field: [0002] The invention relates to a composite low-carbon ironmaking method based on blast furnace gas injection coke oven gas, and belongs to the technical field of blast furnace ironmaking. [0003] Background technique: [0004] Blast furnace ironmaking, as the main steel production process today, has low recycling rate of resources and energy, strong dependence on coke and coking coal resources, and serious environmental pollution. In addition, the energy consumption of the blast furnace process in steel production is the largest, accounting for about 49%; carbon dioxide emissions are also the largest, accounting for about 53%. There is still a big gap between energy consumption and carbon emissions compared with advanced steel-producing countries. Therefore, green manufacturing and green manufacturing have become the development direction of steel production today, with the focus on the improvement and perfection of the blast furnace ironmaking proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/001C21B5/007C21B5/008C21B2005/005
Inventor 毕传光储满生唐珏孙俊杰李峰冯聪柳政根
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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