CN-122012837-A - Online baking method for hot blast stove

Abstract

The invention discloses an online baking method of a hot blast stove. The method comprises the steps of 1) providing preheated hot combustion air for a new hot blast stove through a pipeline by using the hot combustion air of the hot blast stove to carry out low temperature Duan Honglu on the new hot blast stove, 2) providing blast furnace hot air for the new hot blast stove through a pipeline by using a blast furnace hot blast pipeline to carry out heating section baking on the new hot blast stove, and 3) finally carrying out high temperature Duan Honglu by using a burner on the hot blast stove. The invention utilizes the existing hot blast stove production system, does not need to additionally install and remove the baking device, is safer and more reliable, and reduces the labor intensity and the investment cost.

Inventors

• CHEN DONG
• ZHOU FEI
• WANG LEI
• HUANG DONGSHENG

Assignees

• 中冶华天工程技术有限公司

Dates

Publication Date

20260512

Application Date

20260320

Claims (5)

1. 1. An online baking method for a hot blast stove is characterized in that the hot blast stove comprises more than two hot blast stoves which are used in use and a newly built hot blast stove, wherein each hot blast stove is provided with a blast furnace cold air pipeline, a hot combustion air pipeline, a blast furnace hot air pipeline, a gas pipeline, a pressure exhaust flue gas pipeline, a flue gas pipeline and a burner; the hot air pipeline of the blast furnace is respectively communicated with the hot air pipeline of the blast furnace of the newly-built hot air furnace through the pipeline; the method comprises the following steps: 1) The method comprises the steps that preheated hot combustion air is provided for a newly built hot blast stove through a pipeline by using the hot combustion air of the hot blast stove so as to carry out low temperature Duan Honglu on the newly built hot blast stove; 2) Providing blast furnace hot air for a newly built hot air furnace through a pipeline by using a blast furnace hot air pipeline of the hot air furnace so as to heat the newly built hot air furnace to bake the furnace in a heating section; 3) Finally, the high temperature Duan Honglu is carried out by using a burner on the hot blast stove.
2. 2. The method for on-line baking a hot blast stove according to claim 1, wherein the low temperature Duan Honglu is in a temperature range of normal temperature to about 200 ℃ and the heating rate is 1-1.5 ℃ per hour.
3. 3. The on-line baking method for hot blast stoves according to claim 1, wherein the temperature range of the heating section is about 200 ℃ to about 900 ℃ and the heating rate is 1-4.5 ℃ per hour.
4. 4. The method for on-line baking a hot blast stove according to claim 1, wherein the temperature range of the high-temperature section furnace is about 900 ℃ to about 1200 ℃ and the temperature rising rate is 12-13 ℃ per hour.
5. 5. The on-line stove drying method of claim 1, wherein: the novel hot blast stove is characterized in that a pressure discharge pipeline and a flue gas pipeline are also arranged on the newly-built hot blast stove, a pressure discharge valve is arranged on the pressure discharge pipeline, and a flue valve is arranged on the flue gas pipeline; Closing a flue valve in the low temperature Duan Honglu and heating stage baking, opening a pressure discharge valve, and discharging waste gas through a pressure discharge pipeline; and when the furnace is baked at the high temperature section, the pressure discharge valve is closed, the flue valve is opened, and the waste gas is discharged through the flue gas pipeline.

Description

Online baking method for hot blast stove Technical Field The invention relates to an online baking method of a hot blast stove. Background Along with the production requirements of safety, high efficiency, low consumption, energy conservation and low cost of an iron-making blast furnace, the 3 hot blast stoves configured in the traditional blast furnace workshops cannot meet the production requirements, and on the premise of improving the blast temperature and reducing the fuel ratio of the blast furnace, a plurality of blast furnace workshops are required to be additionally provided with 1 hot blast stove so as to meet the normal production requirements of the blast furnace, and meanwhile, if the original 3 hot blast stoves are damaged, if the 1 hot blast stove needs cooling and overhauling, the blast furnace damping is required to directly influence the blast furnace production. A total of 4 hot blast stoves are added after 1 hot blast stove is newly added, if 1 hot blast stove is damaged, the damaged hot blast stove can be overhauled by cooling the stove, and the other 3 hot blast stoves are normally produced without influencing the production of the blast furnace. The hot blast stove baking furnace is an indispensable key process before operation after the installation and construction of the hot blast stove, because the newly constructed stove wall adopts a large amount of unshaped refractory materials and heat preservation casting materials as lining materials of the stove to prevent heat loss. Particularly, a large amount of water exists in the construction process of heat-insulating castable in a furnace adopting a heat-insulating furnace wall structure. If the free water in the heat-insulating casting material is not dried and thoroughly dried before the hot blast stove is put into operation, the water in the stove wall is heated and evaporated to expand the volume of the stove wall to generate certain pressure, so that the stove wall is cracked, and the stove wall is fallen off in a large area when serious deformation and damage occur. Therefore, detailed baking curves and operation measures are required to be prepared according to the consumption of the wear-resistant and fire-resistant heat-insulating materials with different furnace types and the actual thickness of the furnace wall before operation. Meanwhile, the baking furnace can also lead the wear-resistant refractory material of the furnace wall to generate physical and chemical reaction to improve the strength of the material and lead the masonry body to be permanently stable. So that the hot blast stove can safely and normally run for a long time under full load at high temperature, and the aim of high yield and high efficiency is achieved. The traditional hot blast stove baking method is that after the hot blast stove is built, special baking equipment is installed on the hot blast stove, the whole baking process generates high-temperature smoke by combusting combustible media (the combustion media are usually blast furnace gas, natural gas, coke oven gas and the like), the baking is carried out through the high-temperature smoke, and the baking equipment is removed after the baking of the hot blast stove is finished. The hot blast stove has high fuel consumption, special equipment is required to be installed and removed, the labor intensity is high, and the primary investment cost is high. Disclosure of Invention Aiming at the defects, the online baking method for the hot blast stove provided by the invention realizes the baking requirement of the hot blast stove without additionally installing special baking equipment and without whole-course baking under the conditions of normal production of the original hot blast stove and meeting the requirements of safety, low consumption and environmental protection, thereby reducing the labor intensity, saving energy, reducing consumption and reducing the investment and the operation cost to the greatest extent. In order to achieve the aim, the hot blast stove online baking method comprises more than two hot blast stoves which are used in use and a newly-built hot blast stove, wherein each hot blast stove is provided with a blast furnace cold air pipeline, a hot combustion air pipeline, a blast furnace hot air pipeline, a gas pipeline, a pressure exhaust flue gas pipeline, a flue gas pipeline and a burner; the hot air pipeline of the blast furnace is respectively communicated with the hot air pipeline of the blast furnace of the newly-built hot air furnace through the pipeline; the method comprises the following steps: 1) The method comprises the steps that preheated hot combustion air is provided for a newly built hot blast stove through a pipeline by using the hot combustion air of the hot blast stove so as to carry out low temperature Duan Honglu on the newly built hot blast stove; 2) Providing blast furnace hot air for a newly built hot air furnace through a pipeline by using a blast furna