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Different-diameter synchronous-coupled blast furnace tuyere injecting device and injecting method

A technology of synchronous coupling and injection device, applied in the direction of the tuyere, can solve the problems of not considering the reduction of thermal efficiency, energy saving and efficiency improvement, etc., to achieve the effect of large firing range, optimized coking coal ratio, and increased injection area

Pending Publication Date: 2019-09-20
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blast furnace cooling tuyere did not take into account the reduction in thermal efficiency after cooling, and did not consider the issue of energy saving and efficiency enhancement

Method used

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  • Different-diameter synchronous-coupled blast furnace tuyere injecting device and injecting method
  • Different-diameter synchronous-coupled blast furnace tuyere injecting device and injecting method
  • Different-diameter synchronous-coupled blast furnace tuyere injecting device and injecting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A different-diameter synchronously coupled blast furnace tuyere injection device, which consists of a nozzle 1 and an injection body 2 connected to the nozzle. The nozzle 1 is in the shape of a truncated cone or one end is a truncated cone and the other end is cylindrical, and the injection body 2 is a cylinder. The axis of the blowing body is provided with a main nozzle 3 and the main nozzle extends to the nozzle to form the main nozzle 4, and several secondary nozzles 5 are evenly distributed around the main nozzle and the secondary nozzle extends to the nozzle to form the secondary nozzle 6, The auxiliary nozzle is bent at the junction of the nozzle and the injection body, forming an angle of θ≤30° with the axial direction of the injection body; the diameter of the injection body is Φ=50-200mm, and the length of the main nozzle is 0.2-10m. The diameter of the main nozzle is Φ=20-70mm, the diameter of the auxiliary nozzle is Φ=10-20mm, there are 4-16 auxiliary nozzles,...

Embodiment 2

[0032] Using the different-diameter synchronous coupling blast furnace tuyere injection device of embodiment 1 to blast furnace volume 1200m 3 -5500m 3 , the blast furnace temperature range of 1750°C-1950°C is a method for injecting pulverized coal particles, the specific operation steps are as follows:

[0033] Physical quantity requirements of pulverized coal particles:

[0034]

[0035]

[0036] Among them, θ=30°, the length of the main nozzle is 0.32m, the diameter of the main nozzle Φ=20mm, the diameter of the auxiliary nozzle Φ=10mm, there are 16 auxiliary nozzles, and the outlet ends of the auxiliary nozzles are distributed in 2 On the concentric circle of the tube outlet.

[0037] 1) Calculate the total amount of fuel particles injected

[0038] The amount of smelting coal powder added to the blast furnace according to the process needs ranges from 120-220kg;

[0039] Take the antegrade coefficient of the blast furnace α=0.5 (the antegrade coefficient of the ...

Embodiment 3

[0047] Using the different-diameter synchronous coupling blast furnace tuyere injection device of embodiment 1 to blast furnace volume 1200m 3 -4200m 3 , the blast furnace temperature range of 950 ℃ -1200 ℃ for the method of injecting gas, the specific operation steps are as follows:

[0048] θ=6°, the length of the main nozzle is 0.27m, the diameter of the nozzle is Φ=40mm, the diameter of the auxiliary nozzle is Φ=15mm, there are 8 auxiliary nozzles, and the outlet of the auxiliary nozzle is distributed in one concentric with the outlet of the main nozzle on the circle.

[0049] The outlet pressure of the injection device is 0.1--3Mpa, and the fluid turbulence intensity of the gas: 2.7m 2 / s 2 ; The injection time is 0.7h, and the gas temperature at the tuyere is 950°C.

[0050] Compared with the existing single-tube spray gun with the same length and diameter, 1) under the same injection pressure, the injection length is increased by 8.2%; 2) the impact depth of the inj...

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Abstract

Aiming at the problems of blast furnace tuyeres in the prior art, the invention provides a different-diameter synchronous-coupled blast furnace tuyere injecting device and method, and belongs to the technical field of iron smelting. The device consists of a nozzle, and an injecting body connected with the nozzle; the nozzle takes the shape of a circular table, or one end takes the shape of the circular table, and the other end takes the shape of a cylinder; the injecting body is a cylinder; a main injecting pipe is arranged in the axis of the injecting body, and extends to the nozzle to form a main injecting port; multiple secondary injecting pipes are uniformly distributed around the main injecting pipe, and extend to the nozzle to form secondary injecting ports; and the secondary injecting pipes are bent in the connecting place of the nozzle and the injecting body, and form angles of not bigger than 30 degrees with the axial direction of the injecting body. The device can inject both solids and gas; when fuels are injected, fuel particles are attached on objects to increase the reaction surface area, so that the heat efficiency energy is improved; metallurgical dust and waste gas and excessive gas of a hot blast heater are injected through resource recycling; and the impact depth and area of injecting in the blast furnace tuyere area by the device are increased.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a device and an injection method for injecting solid particles and gas from blast furnace tuyeres with different diameters synchronously coupled. Background technique [0002] The tuyeres of ironmaking blast furnaces are generally used to blow high-temperature hot air and oxidize and burn coke at the bottom of the furnace to generate CO. However, the tuyere is designed in a single way, resulting in small spray area and length, low efficiency, and is not suitable for spraying both solid and liquid. [0003] The improvement of the tuyere in the prior art includes: a blast furnace cooling tuyere, the application number is CN201811526001.4, which discloses the tuyere, including a front cap, a middle cap, and a rear cap, and the front cap, the middle cap, and the rear cap form a hollow Cavity structure; a partition is provided between the front cap and the middle cap, ...

Claims

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Application Information

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IPC IPC(8): C21B7/16
CPCC21B7/16
Inventor 刘坤陈立峰韩鹏刘广强冯亮花
Owner UNIV OF SCI & TECH LIAONING
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