阅读说明：本技术 一种改进的高炉喷吹复合风口 (Improved blast furnace blowing composite tuyere ) 是由 田果 徐万仁 陈若平 于 2020-08-11 设计创作，主要内容包括：本发明公开了一种改进的高炉喷吹复合风口,包括风口本体,风口本体内分为前腔室和后腔室两部分冷却室,前、后腔室冷却水互不串通,当前腔室烧损泄漏停水通氮气冷却,后腔式通水保证炼铁工艺继续运行,前腔室冷却水量25-30m3/h,水流速达到14-16m/s,水温差1.5-3℃；氧气通道在风口中心、管道直径φ28-30,氧气流速185 m/s；煤气管道设置在氧气管侧方45°位置,煤气管道贯通风口本体冷却水通道,煤气管道直径φ27喷出口缩径至直径φ16,使喷出煤气与喷出的氧气平行,在风口本体端面位置不混合燃烧。(The invention discloses an improved blast furnace blowing composite tuyere, which comprises a tuyere body, wherein the inside of the tuyere body is divided into a front cavity and a rear cavity which are cooling chambers, cooling water of the front cavity and the rear cavity are not communicated with each other, the current cavity is burnt, leaked, stopped and filled with water and cooled by nitrogen, the rear cavity is filled with water to ensure that an iron-making process continues to operate, the cooling water amount of the front cavity is 25-30 m/h, the water flow rate reaches 14-16m/s, and the water temperature difference is 1.5-3 ℃; the oxygen channel is arranged in the center of the tuyere, the diameter of the pipeline is phi 28-30, and the oxygen flow rate is 185 m/s; the gas pipeline is arranged at the position of 45 degrees at the side of the oxygen pipe, the gas pipeline penetrates through the cooling water channel of the vent body, the diameter phi 27 of the gas pipeline is reduced to the diameter phi 16, the sprayed gas is parallel to the sprayed oxygen, and the gas and the oxygen are not mixed and combusted at the end face of the tuyere body.)

1. The utility model provides a compound wind gap of modified blast furnace jetting, includes the wind gap body, characterized by: the tuyere body is divided into a front cavity and a rear cavity which are cooling chambers, cooling water of the front cavity and the rear cavity are not communicated with each other, the current cavity is burnt, the water leakage is stopped, the nitrogen gas is introduced for cooling, the rear cavity type water introduction ensures that the ironmaking process continues to operate, the cooling water amount of the front cavity is 25-30 m/h, the water flow rate reaches 14-16m/s, and the water temperature difference is 1.5-3 ℃; the oxygen channel is arranged in the center of the tuyere, the diameter of the pipeline is phi 28-30mm, and the oxygen flow rate is 185 m/s; the gas pipeline is arranged at the position of 45 degrees at the side of the oxygen pipe, the gas pipeline penetrates through the cooling water channel of the vent body, the diameter phi 27 of the gas pipeline is reduced to the diameter phi 16, the sprayed gas is parallel to the sprayed oxygen, and the gas and the oxygen are not mixed and combusted at the end face of the tuyere body.

Technical Field

The invention relates to an improved blast furnace blowing composite tuyere.

Background

An iron-making system of a metallurgical enterprise belongs to a large energy consumption household, the coke ratio used in blast furnace smelting reaches 550kg/t molten iron, the working condition of a blast furnace tuyere is that heated 1100 ℃ air is introduced, and simultaneously oxygen enrichment is the proportion that the oxygen content in the air reaches about 24%. In recent years, it has been reported that the blast furnace tuyere injection test is performed in domestic, the blast furnace shaft injection coke oven gas performed in japan is performed abroad, and the blast furnace tuyere injection technology of other fuel oil type fuels and natural gas performed in european countries is in operation. However, the technology of blowing flammable and combustible fuel through the total oxygen tuyere is not reported to be implemented. The reduction iron-making process is a new full-oxygen iron-making process starting industrial production in recent years, and in China, the smelting reduction iron-making technology is represented by Baoku group Xinjiang eight-steel European smelting furnace upgraded on the basis of COREX. The iron-making process uses total oxygen injection, and the long-life safe operation of the total oxygen tuyere is internationally leading. The project of spraying top gas through the total-oxygen smelting tuyere is researched in 11 months in 2017, and meanwhile, oxygen tuyere equipment used for spraying gas through the total-oxygen smelting tuyere is researched, and the industrial implementation of spraying gas through the total-oxygen tuyere has no referential precedent. Development and innovation are carried out in the development and calculation process, and the tuyere small sleeve of the existing Ou-Meta furnace total oxygen blowing coal gas is generated.

Disclosure of Invention

The invention aims to provide an improved blast furnace injection composite tuyere, which is characterized in that pure oxygen and coal gas are injected simultaneously, a small set of tuyere operates stably, has good safety effect and outstanding process effect, provides technical support for a mixed injection process of inflammable and explosive gaseous fuel and total oxygen, initiates a new iron-making technology process, and meets the national general environmental-protection target requirements of carbon emission reduction and circular economy.

The invention aims to realize the purpose, and the improved blast furnace injection composite tuyere comprises a tuyere body, wherein the inside of the tuyere body is divided into a front cavity and a rear cavity which are cooling chambers, cooling water of the front cavity and the rear cavity are not communicated with each other, the current cavity is burnt, leaked, stopped, filled with water and cooled by nitrogen, the rear cavity is filled with water to ensure that an iron-making process continues to operate, the cooling water amount of the front cavity is 25-30m for powder/h, the water flow rate reaches 14-16m/s, and the water temperature difference is 1.5-3 ℃; the oxygen channel is arranged in the center of the tuyere, the diameter of the pipeline is phi 28-30, and the oxygen flow rate is 185 m/s; the gas pipeline is arranged at the position of 45 degrees at the side of the oxygen pipe, the gas pipeline penetrates through the cooling water channel of the vent body, the diameter phi 27 of the gas pipeline is reduced to the diameter phi 16, the sprayed gas is parallel to the sprayed oxygen, and the gas and the oxygen are not mixed and combusted at the end face of the tuyere body.

The invention simultaneously injects pure oxygen and coal gas, has stable operation of a small set, good safety effect and outstanding process effect, provides technical support for the mixed injection process of inflammable and explosive gaseous fuel and total oxygen, initiates a new process of iron-making technology, and meets the environmental protection general target requirements of national reduction of carbon emission and circular economy. The invention installs 14 sets of furnaces for use and operation in eight-steel smelting reduction iron-making Europe and metallurgy furnaces in Xinjiang, has safe and stable operation, has the gas spraying capacity of 8000m and high speed/h, the temperature of sprayed gas is 170 ℃, and the silicon content in molten iron is reduced to below 1.0. The goal of coal gas recycling is realized, the smelting efficiency of the total-oxygen tuyere is obviously improved, and the smelting rate per hour reaches over 155 tHM/h.

Drawings

The present invention will be described in further detail below with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional front view of the present invention;

FIG. 2 is a schematic side view of the present invention.

Detailed Description

An improved blast furnace blowing composite tuyere is shown in figures 1 and 2 and comprises a tuyere body 2, a front cavity 7 and a rear cavity 6 which are provided with a water inlet 4 and a water outlet 9 are arranged in the tuyere body 2, and the water inlet 4 and the water outlet 9 are respectively arranged on a back panel 1 of the tuyere body 2. The outer periphery of the rear part of the tuyere body 2 is provided with a sealing ring 3. Cooling water of the front cavity 7 and the rear cavity 6 are not communicated with each other, the current cavity is burnt, leaked, water is cut off, nitrogen is introduced for cooling, the rear cavity type water introduction ensures that the ironmaking process continues to operate, the cooling water amount of the front cavity is 25-30m for carrying out the year/h, the water flow rate reaches 14-16m/s, and the water temperature difference is 1.5-3 ℃; the oxygen channel 5 is arranged in the center of the tuyere, the diameter of the pipeline is phi 28-30, and the oxygen flow rate is 185 m/s; the gas pipeline 8 is arranged at the position of 45 degrees at the side of the oxygen pipe 5, the gas pipeline 8 penetrates through the cooling water channel of the tuyere body, the diameter phi 27 spraying port of the gas pipeline 8 is reduced to the diameter phi 16, so that the sprayed gas is parallel to the sprayed oxygen, and the gas and the oxygen are not mixed and combusted at the end face of the tuyere body.