Ironmaking method

A blast furnace and gas furnace technology, applied in the field of iron and steel metallurgy, can solve the problem that the amount of injection cannot be adjusted arbitrarily, and achieve the effect of convenient and flexible adjustment

Active Publication Date: 2011-11-02
MCC CAPITAL ENGINEERING & RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, CaO is added for the purpose of increasing the combustion rate of pulverized coal. It is injected into the furnace together with pulverized coal. The amount of CaO injected is related to the amount of pulverized coal injected, and the injected amount cannot be adjusted arbitrarily.

Method used

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Examples

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Embodiment 1

[0077] This embodiment provides a kind of blowing equipment for blowing limestone from tuyeres, its structure is as follows: image 3 As shown, the equipment includes a pulverizing system, a drying flue gas system and an injection system, among which:

[0078] The pulverizing system includes a limestone silo (silo) 6, a vertical mill 8 (with a raw material inlet, a gas inlet and a powder outlet), a bag powder collector 9, and a limestone powder bin 12. The pulverizing system is used to prepare Limestone powder, the pulverizing system also includes a grab crane 1, a batching hopper 2, a feeder 3, an iron remover 4 and a large-inclination belt conveyor 5, which are used to transport limestone raw materials to the limestone bin 6;

[0079] The dry flue gas system includes a flue gas furnace 17, an induced draft fan 18 and a combustion-supporting fan 19, which are used to provide blown gas, and a dry flue gas system commonly used in the art can be used;

[0080] The blowing syste...

Embodiment 2

[0090] The present embodiment provides a kind of blowing equipment that is used for blowing limestone from tuyeres, wherein, the spray gun that adopts is a tuyeres direct blow pipe, and it can comprise a body 23, a limestone powder spray gun 21 and a coal powder spray gun 22, Its structure is as Figure 4 with Figure 5 As shown, among them, Figure 4 for Figure 5 A-A sectional view, Figure 5 for Figure 4 C-C sectional view. It can be seen from the figure that the body 23 is conical, and the tip of the cone extends into the furnace of the blast furnace / gas furnace through the tuyere. The center of the body 23 has a through hole, and the limestone powder spray gun 21 and the coal powder spray gun 22 are arranged on the body. 23, the part near the outside, and the two form an angle of 10-12° with the center line of the through hole, and its end communicates with the above-mentioned through hole for spraying limestone powder into the furnace;

[0091] The other parts of ...

Embodiment 3

[0093] This embodiment provides a method of adding CaCO to the blast furnace through the tuyeres 3 The smelting method includes operations such as feeding, pulverizing, and blowing, wherein, the blowing operation is to inject limestone powder and coal powder from the tuyeres. The smelting method provided in the present embodiment adopts the injection equipment provided in Example 2 to carry out, and the specific steps are as follows:

[0094] Feeding: the limestone raw material is sent into the limestone bin 6 through the grab crane 1, the batching hopper 2, the feeder 3, the iron remover 4 and the large-inclination belt conveyor 5;

[0095] Milling: the limestone raw material is sent to the vertical mill 8 through the closed automatic weighing feeder 7 for crushing and grinding to obtain limestone powder, which is mixed with the gas from the flue gas furnace 17 at the same time, and the limestone powder is crushed by this part of the gas Bring in the bag powder collector 9; ...

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Abstract

The invention relates to an ironmaking method, which comprises the following steps of: mixing alkaline solvent and gas, and blowing the mixture to a hearth of furnace cavity of a blast furnace or a gas producing furnace from a tuyere of the blast furnace or the gas producing furnace. In the ironmaking method, the alkaline solvent is blown from the tuyere, and heat quality consumed by the decomposition of the alkaline solvent is compensated by utilizing the redundant capacity of the theoretic combustion temperature in front of the tuyere to fulfill the aim of saving coke; meanwhile, consumed carbon also can be saved, so the economic benefit is obvious. In addition, by the ironmaking method, a heat value of furnace top gas can be improved, and the production efficiency of smelting is improved.

Description

technical field [0001] The invention relates to an ironmaking method and belongs to the technical field of iron and steel metallurgy. Background technique [0002] With the continuous development of blast furnace ironmaking high blast temperature technology, blast furnace blast hot blast temperature has reached 1300 °C. The physical heat brought in by the blast has a certain margin in the theoretical combustion temperature formed in the tuyere area of ​​the blast furnace. Most blast furnace operations reduce the theoretical combustion temperature by humidifying the blast or increasing the amount of coal injection to keep the theoretical combustion temperature stable in a certain area. . The increase of blast furnace blast temperature will consume low-value blast furnace gas, which can reduce the consumption of high-value coke in the blast furnace. [0003] Under the smelting conditions of the blast furnace or gas furnace, the gangue and ash in the raw material and fuel can...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 王艳民叶果朱进锋刘颖陈伟张波全强
Owner MCC CAPITAL ENGINEERING & RESEARCH
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