Blast furnace blow-in cold air material drying method
A cold air and blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of waste gas, low blast furnace gas temperature, and large water content, and achieve fast opening of the furnace to lead gas, reduce environmental pollution, and low moisture content. Effect
Inactive Publication Date: 2020-04-21
SD STEEL RIZHAO CO LTD
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Problems solved by technology
[0003] In the existing technology, after the preparation of the blast furnace is completed, the blast furnace gas is ignited and started. The temperature of the blast furnace gas generated at the initial stage of the furnace is low, and the water content is large. It is not possible to use the full dry dust removal bag to perform fine dust removal on the gas to reach the dust content in the gas required by the user. The requirement of 10mg / m3, so a large amount of gas is released to the air within 8-16 hours at the beginning of the furnace, which wastes gas and pollutes the environment
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[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely in further detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0019] like figure 1 Shown, a kind of method of blast furnace cold air drying material comprises the following steps:
[0020] 1) Control the water content of the incoming raw materials before blast furnace 1 is started, use CDQ to start the furnace, use direct sintering for sintering, and use raw materials with a moisture content of ≤ 2% as auxiliary materials for starting the furnace;
[0021] 2) To prepare for the start-up time, use the blast furnace fan to provide blast, and carry out cold air drying of the furnace charge in the blast f...
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The invention discloses a blast furnace blow-in cold air material drying method. The method comprises the following steps of 1) controlling a water content of a raw material entering into a blast furnace before blow-in, using dry quenching to open the furnace, sintering mine by using direct supply sintering, and selecting the raw material with the water content which is less than or equal to 2% asa blow-in auxiliary material; 2) preparing blow-in time, providing blast by using a blast furnace fan, carrying out cold air material drying on a furnace burden in a blast furnace through a blast furnace cold air regulating valve pipeline, and controlling a flow of cold air; 3) judging whether cold air oven drying can be ended and ignition blow-in time is reached by detecting a temperature of a blast furnace top exhaust gas; and 4) when planned ignition blow-in time of the blast furnace is reached, directly switching to a hot-blast stove from a cold air furnace drying state to supply air. According to the designed method, the furnace burden loaded into the blast furnace is heated in advance, free water in the furnace burden is dried, the temperature of the blast furnace gas at an initialstage of blow-in air supply ignition is increased, meanwhile, a moisture content in the gas is low, the blast furnace gas can be rapidly recycled during blow-in, environmental pollution is reduced, and the gas is recycled in advance.
Description
technical field [0001] The invention relates to the technical field of blast furnace start-up, in particular to a method for blast furnace start-up cold air drying materials. Background technique [0002] During the start-up process of domestic blast furnaces, the furnace is basically filled with coke and ore at room temperature in advance. When the furnace is started, hot air (650-750°C hot air) is blown into the furnace from the tuyere to ignite the coke or firewood to generate high-temperature gas. , Gradually heat the blast furnace and the upper furnace charge. The blast furnace gas produced during this process contains 23-35% CO. In the initial stage of furnace ignition and air supply, the temperature of the gas reaching the top of the blast furnace is low, generally around 30 ° C. Dry dust removal bag Unable to accept gas, the gas in this process needs to be released directly into the atmosphere, which lasts about 10-16 hours, until the temperature of the gas on the to...
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IPC IPC(8): C21B5/06
CPCC21B5/06Y02P10/25
Inventor 杨雷
Owner SD STEEL RIZHAO CO LTD