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Down pipe device for high-intensity flash iron-making furnace and control process thereof

An iron-making furnace and high-strength technology, applied in the field of metallurgy, can solve problems such as low equipment operation rate, insufficient utilization of coal gas chemical energy and physical heat, and difficult pre-reduction control

Pending Publication Date: 2019-01-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing non-blast furnace ironmaking technology and equipment still cannot completely replace the blast furnace ironmaking technology. The main problems are difficult pre-reduction control, low equipment operation rate, insufficient utilization of gas chemical energy and physical heat, and high coal consumption and oxygen consumption.

Method used

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  • Down pipe device for high-intensity flash iron-making furnace and control process thereof
  • Down pipe device for high-intensity flash iron-making furnace and control process thereof
  • Down pipe device for high-intensity flash iron-making furnace and control process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: see Figure 1 to Figure 3 , a downcomer device for a high-strength flash ironmaking furnace, comprising an upper rectangular downcomer 1, a middle wedge-shaped downcomer 2 and a lower rectangular downcomer 3 that are sealed and communicated sequentially from top to bottom.

[0033] The cross-section and longitudinal section of the upper rectangular feeding pipe 1 are rectangular, that is, the upper rectangular feeding pipe 1 is a cuboid, the cross-section of the wedge-shaped feeding pipe 2 in the middle is rectangular, and the longitudinal section of the wedge-shaped feeding pipe 2 in the middle is rectangular. Both are trapezoidal, and the cross section and longitudinal section of the lower rectangular feeding pipe 3 are rectangular, that is, the lower rectangular feeding pipe 3 is a cuboid;

[0034] The width of the upper rectangular blanking tube 1 is consistent with the bottom width of the middle wedge-shaped blanking tube 2, and the width of the botto...

Embodiment 2

[0048] Embodiment 2: A downcomer control process of a high-strength flash ironmaking furnace, using the downcomer device of the high-strength flash ironmaking furnace in Embodiment 1. The downcomer is between the rotary kiln and the melting furnace. By adjusting the process parameters of the downcomer, the precise control of the furnace top gas temperature, pressure, flow rate and charge temperature can be realized.

[0049] Specifically, the length of the upper rectangular feeding pipe 1 is 1.5-3 m, the width is 0.5-1 m, and the height is 0.5-3 m.

[0050] 1 m; the temperature of the upper rectangular feeding pipe 1 is controlled at 900-1100°C, and the gas composition is controlled at a CO volume percentage of 40-60%, which can be specifically 40%, 45%, 50%, 55% or 60% , CO 2 The volume percentage of H is 20-30%, specifically it can be 20%, 22%, 25%, 28% or 30%, H 2 The volume percentage is 7 to 15%, specifically it can be 7%, 9%, 10%, 12% or 15%, N 2 The volume fraction i...

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Abstract

The invention discloses a down pipe device for a high-intensity flash iron-making furnace and a control process thereof. The device comprises an upper rectangular discharging pipe, a middle wedge-shaped discharging pipe and a lower rectangular discharging pipe which are sequentially communicated from top to bottom; the side wall of the lower rectangular discharging pipe is provided with a plurality of upper-row cold coal gas inlets and a plurality of lower-row cold coal gas inlets, the cold coal gas inlets are connected with a coal gas loop pipe, a plurality of cold gas nozzles are connected to the coal gas loop pipe, the cold gas nozzles extend into the lower rectangular discharging pipe through the cold coal gas inlets, and the cold gas nozzles are in sealing fit with the cold gas inlets; and the down pipe device includes a data monitoring device for monitoring the temperature, pressure and compositions of mixed gas in a down pipe. By means of the control process, technological parameters of the down pipe are adjusted, and precise control over the furnace top coal gas temperature, pressure and flow rate and the furnace material temperature is achieved. The down pipe device has the advantages of being simple in equipment, compact in connection and large in equipment cooling intensity, a cooling device has the characteristics of online monitoring and automatic control, and large-scale application and popularization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a downcomer control process of a high-strength flash ironmaking furnace. Background technique [0002] The traditional blast furnace ironmaking process is long. Blast furnace ironmaking must use sinter, pellets and coke. The energy consumption and CO 2 Emissions account for more than 70% of the total steel process, and pollutant emissions account for more than 90% of the total. The shortage of coke and the rising price of coke have seriously increased the cost of blast furnace ironmaking. The problems of high energy consumption and high pollutant emissions in the sintering, pelletizing and coking processes are key technical problems that cannot be avoided in the blast furnace ironmaking process. Therefore, in order to get rid of the shortage of coking coal resources on the development of the iron and steel industry, adapt to the increasing environmental protection requirements, ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
CPCC21B13/0006C21B13/0073
Inventor 张颖异马小龙赵杰高建军王训富王锋齐渊洪林万舟严定鎏
Owner CHONGQING UNIV
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