Fuel gas injection and distribution device and control method thereof

Abstract

The invention relates to a gas injection and distribution device and a control method thereof, and belongs to the technical field of sintering equipment. The fuel gas injection and distribution devicecomprises an injection cover, an injection branch pipe, multiple layers of injection pipe rows, a charge level negative pressure detector and a control system. One end of the injection branch pipe isconnected with an air source, and the other end of the injection branch pipe is provided with a plurality of branch pipes; The multiple layers of injection pipe rows are in one-to-one correspondencewith the multiple branch pipes respectively, the multiple layers of injection pipe rows are distributed at intervals in the Z direction, and each layer of injection pipe row is connected with one branch pipe through a flow control valve; the charge level negative pressure detector is arranged at the upstream of the injection cover and is used for detecting the charge level negative pressure of thesintering charge of a sintering machine trolley to enter the injection cover; and the control system is electrically connected with the charge level negative pressure detector and the flow control valves, and the control system is used for controlling the flow control valves to work in response to a charge level negative pressure value detected by the charge level negative pressure detector so asto realize fuel gas injection of at least one layer of injection pipe row. The fuel gas injection and distribution device is good in auxiliary effect and high in safety coefficient.

Description

technical field [0001] The present application relates to the technical field of sintering equipment, in particular, to a gas injection and distribution device and a control method thereof. Background technique [0002] The sintering process is a key link in the ironmaking process. Its principle is to mix various powdery iron-containing raw materials with an appropriate amount of fuel and flux, add an appropriate amount of water, mix and pelletize the material on the sintering equipment to make the material A series of physical and chemical changes, sintered into blocks, which are sent to the blast furnace for the next step. [0003] In order to reduce the coke ratio and smelting cost of blast furnace ironmaking, blast furnaces often require high strength and high reducibility for sintered ore. Therefore, during the sintering process, it is generally necessary to inject fuel on the surface of the sintered material to improve the strength and reducibility of the sintered mat...

AI Technical Summary

Problems solved by technology

[0005] The gas injection device under the existing technology, due to the frequent fluctuation of the negative pressure value of the material surface in the hood due to various factors of the working conditions of the sintering machine, can easily cause the mismatch between the negative pressure value of the material surface and the height of the injection pipe row, so in the long-term production There are two problems in the following:

[0006] 1. The negative pressure on the material surface is too high: the injected gas will be sucked into the material layer by the excessively high negative pressure on the material surface as soon as it exits the nozzle hole, and there is not enough time to mix and dilute with the atmosphere in the hood, resulting in the gas entering the material layer The concentration is not the design concentration and is extremely uneven, which will cause uncontrollable multi-position combustion of gas in the material layer, which will not only affect the auxiliary effect of gas injection, but also have a negative impact on the quality of sintered finished ore;

[0007] 2. Negative pressure on the material surface is too low: the ejected gas will scatter and escape due to insufficient downward suction to pull it, not only cannot form a stable and orderly flow field in the hood, but will easily cause gas overflow or gas Enrichment of explosion accidents greatly reduces production safety factor

Images