Method and device for simulating pure oxygen iron-making and blast furnace gas recycling

A blast furnace gas and oxygen production device technology, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems that the molten steel at the bottom cannot form enough agitation, the blast furnace wall is greatly affected, and the amount of gas-supporting gas is small, etc., to achieve separation Low cost, cost-effective and efficient utilization

Active Publication Date: 2020-08-04
BEIJING PEKING UNIV PIONEER TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in pure oxygen smelting are: 1) Oxygen cannot be heated, otherwise the high-temperature oxygen delivery pipeline will be oxidized, and the nozzle will be easily oxidized and damaged; 2) The furnace temperature is too high, which has a great impact on the furnace wall of the blast furnace; The molten steel at the bottom cannot be sufficiently agitated, which affects the reduction effect. At the same time, the small gas volume will lead to low furnace top temperature, which is not conducive to the early reduction of iron ore
Therefore, there is a large amount of N in the blast furnace gas 2 , so as to increase the difficulty of CO purification, resulting in the inability to efficiently utilize low-concentration CO, and it is difficult to achieve the purpose of energy saving and emission reduction

Method used

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  • Method and device for simulating pure oxygen iron-making and blast furnace gas recycling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Blast furnace volume: 2000m 3 ; Use ordinary coal: 400kg / ton of iron, the composition of ordinary coal is shown in Table 1, and the fixed carbon consumption is 298kg / ton of iron. Blast furnace utilization factor: 2.95 tons of iron / (m 3 ·sky). Oxygen consumption: 230m 3 / ton of iron, its composition is as table 2, and the present embodiment attributes the Ar inert gas to N 2 middle. Blast furnace gas output: 2600Nm 3 / ton of iron, its composition is shown in Table 3.

[0060] Table 1 Composition of Common Coal (%)

[0061] C H 2

N 2

O 2

S h 2 o

Ash 74.5 4.2 0.4 3.4 0.5 0.8 16.2

[0062] Table 2 Oxygen Composition (%):

[0063] O 2

N 2 (including N 2 +AR)

90％ 10％

[0064] Table 3 Composition of blast furnace gas (%, dry gas)

[0065] CH 4

CO CO 2

H 2

N 2

0.35 48.29 34.26 11.56 5.54

[0066] For every ton of iron produced, the total amount of puri...

Embodiment 2

[0073] Blast furnace volume: 2000m 3 Coal usage: coking coal 200kg / ton of iron, its composition is shown in Table 6; ordinary coal 130kg / ton of iron, its composition is shown in Table 1. The total carbon consumption is 265kg / t iron. Blast furnace utilization factor: 3.25 tons of iron / (m 3 ·sky);

[0074] Table 6 coking coal composition (%)

[0075] C H 2

N 2

O 2

S h 2 o

Ash 83.8 0.3 0.3 3.4 0.5 1.5 14.6

[0076] Oxygen consumption: 190m 3 / ton of iron, its composition is as table 7, the present embodiment attributes the Ar inert gas to N 2 middle.

[0077] Table 7 Oxygen Composition (%):

[0078] O 2

N 2 (including N2+AR)

99％ 1％

[0079] Blast furnace gas output: 2250Nm 3 / ton of iron, its composition is shown in Table 3

[0080] Table 8 Composition of blast furnace gas (%, dry gas)

[0081] CH 4

CO CO 2

H 2

N 2

0.38 53.16 38.88 5.43 2.15

[0082] For ...

Embodiment 3

[0089] Blast furnace volume: 2000m 3 , for tempering joint production.

[0090] Common coal is 770kg / ton of iron, and its composition is shown in Table 1; the total carbon consumption is 574kg / ton of iron. Blast furnace utilization factor: 2.95 tons of iron / (m 3 day), by-product pure CO gas 860Nm 3 ;Oxygen consumption: 380m 3 / ton of iron, its composition is shown in Table 2. Blast furnace gas output: 1875Nm 3 / ton of iron, its composition is shown in Table 11.

[0091] Table 11 Composition of blast furnace gas (%, dry gas)

[0092] CH 4

[0093] For every ton of pig iron produced, the total amount of CO product gas after purification is 1215m 3 , its composition is shown in Table 12, and the yield of pure CO is 858m 3 The gas volume per ton can be used for chemical synthesis.

[0094] Table 12 Composition of CO product gas (%)

[0095] CH 4

[0096] For each ton of pig iron produced, CO after purification 2 The total product gas volume is ...

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Abstract

The invention discloses a method and a device for simulating pure oxygen iron-making and blast furnace gas recycling. The device comprises oxygen production equipment, a hot blast stove, a blast furnace, dust removal equipment, pressurizing equipment, CO2 separating equipment, a CO2 compressor, a CO2 storage tank, a CO storage tank and a valve component. In an original blast furnace iron-making process, oxygen is prepared by adding the oxygen production equipment and CO2 is separated from CO by adding the CO2 separating equipment; part CO2 obtained by separating is mixed with the oxygen in a certain proportion to serve as a combustion-supporting gas for the blast furnace iron-making, so that a large amount of N2 in a blast furnace gas is avoided; the difficulty in purifying the CO is reduced; the utilization value of the blast furnace gas is improved; the consumption of coke and coal for the blast furnace iron-making is reduced; and therefore, the purposes of saving energy and reducingthe emission of the CO2 are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, energy saving and environmental protection, and relates to ironmaking and blast furnace gas recycling technologies, in particular to a pseudo-pure oxygen ironmaking and blast furnace gas recycling method and device. Background technique [0002] During the blast furnace ironmaking process, about 1600m 3 blast furnace gas, in which the CO content is 20-24%, CO 2 The content is 16-20%, N 2 The content is about 40-50%. Due to the low calorific value, CO and N 2 Separation is difficult, resulting in low utilization value of blast furnace gas, so that a certain proportion of blast furnace gas is directly burned and discharged as released gas. CO and CO 2 The proportion in the blast furnace gas is basically fixed, and the root cause of the low calorific value and the difficulty of separation is N 2 , however nitrogen is brought in by the combustion air. The main problems in pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/06C21B7/00
CPCC21B5/06C21B7/002Y02P10/25Y02P10/122
Inventor 耿云峰李世刚
Owner BEIJING PEKING UNIV PIONEER TECH
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