Blast furnace oven method

Abstract

The invention relates to a blast furnace drying method and belongs to the technical field of iron metallurgy. According to the method, a temporary circulation loop is built, and according to the temporary circulation loop, water sequentially circulates in a circulating water channel, a second pipe, a temporary pipe and a first pipe, and only storage water circulation in the temporary circulation loop is depended on. The water flow direction of the temporary circulation loop is opposite to the water flow direction in a cooling water circulation loop. A temporary water pump is adopted for directly guiding cooling water which is on the upper portion of a furnace body and high in temperature to a hearth position in the manner of reverse circulation, and the cooling water is used for heating ahearth refractory material, raising the temperature of the hearth refractory material, accelerating evaporation of moisture in the refractory material and improving the strength of the hearth refractory material. By means of the blast furnace drying method, the cooling water does not take away heat any more; the heat is transmitted to a surrounding refractory material through a cooling wall to raise the temperature of the refractory material; the temperature of a refractory material of the furnace body can be raised rapidly, the furnace drying time can be shortened, the furnace drying qualityis guaranteed, and water consumption and electric consumption formed during the furnace drying period are remarkably reduced.

Description

technical field [0001] The invention relates to a blast furnace drying method, which belongs to the technical field of iron metallurgy. Background technique [0002] According to the applicant's understanding, the blast furnace needs to be baked before starting, and the following two methods are mainly used in China: [0003] 1) The hot air of the hot blast furnace is used for drying, and the drying device is installed in the furnace hearth. The specific mechanism and method can be seen in: Chinese patent: ZL201320569219.4, the invention name is "A Low Suspension Bed Type Drying Device", which is installed in the furnace During the process, the furnace body is cooled by water. Although the furnace device can lead the hot air to the bottom of the furnace during the drying process, the direction of the air flow is generally upward, and the flow direction of the cooling water is from bottom to top (from the cooling wall of the hearth to the furnace body). Cooling wall), so the...

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Problems solved by technology

At this temperature, the performance of carbon ramming material (including strength and thermal conductivity) is poor, and the effect of the oven cannot be achieved.

[0004] 2) In recent years, with the re-understanding of the oven process, some people have proposed to close the cooling circulating water and feed high-temperature medium into the circulating water to improve the oven effect. The specific mechanism and method can be seen in: Chinese patent: ZL201410686991.3, invention The name is "A Blast Furnace Oven Method", but if this method is not properly operated, it will cause local overheating of the cooling water pipe, which may cause boiling and affect the safety of the oven

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