Sieving method for blast furnace feeding system

Abstract

The invention relates to a method for filtering material by a blast furnace feeding system and belongs to the technical field of blast furnace ironmaking feeding system equipment modification. Under a mode of not installing a vibrating feeder, a manual board plug valve is opened; raw material is pressed on a sieve directly; when a weighing can sends a material-requiring application, the material on the sieve enters into the weighing can directly to be conveyed into a furnace for ironmaking. The method is characterized in that a pneumatic board plug valve which is controlled by a computer is added at the back of the manual board plug valve at a silo feed opening of a crude fuel system in a silo; after the manual board plug valve is closed completely, the feed opening which meets the technical requirement is cut on a valve board according to different crude fuel in the silo; and when material is required to be filtered, the computer controls the pneumatic board plug valve to feed. The method has the advantages that the step of adding a vibrating feeder in the original design of a feeding system is simplified, the corresponding, expenses for engineering construction, equipment purchase, later maintenance and the like are saved, the granularity of the raw material is improved effectively by the exact control of the filtering process and the yield of the blast furnace is raised by 1 percent after the raw material quality is improved.

Description

technical field

[0001] The invention belongs to the technical field of equipment transformation of a blast furnace smelting feeding system, and in particular provides a method for screening material in a blast furnace feeding system, which is suitable for improving the quality of raw materials and fuels in the blast furnace smelting belt feeding link. Background technique

[0002] The design of the charging system of the ironmaking blast furnace usually adopts the following two modes according to the traditional process:

[0003] The first method is to install a vibrating feeder under the manual plug-in valve of the lower material port of the silo, and the vibrating feeder feeds the sieve below. The advantage of this method is that it can ensure that no material accumulates on the sieve, thus better The screening effect is guaranteed, but the disadvantage is that the initial investment of the project is huge, the equipment is complicated, and the cost is high. During the fal...