Full-automatic back flushing fiber bundle filter of slag flushing water of blast furnace and back flushing control method

Abstract

The invention provides a full-automatic back flushing fiber bundle filter of slag flushing water of a blast furnace and a back flushing control method, solving the problems that the conventional fiber bundle filter can not effectively remove slag wool suspended substances, back flushing can not be controlled automatically, and the effect is poor. The full-automatic back flushing fiber bundle filter comprises a tank body, a slag flushing water inlet, a slag flushing water outlet, a back flushing water inlet, a back flushing water outlet, a fiber bundle filtering layer, an upper fixed filter plate and a lower movable filter plate, wherein the top end at the upper part of the tank body is communicated with a floating slag discharge pipeline and connected with a differential pressure transmission, the differential pressure transmission is connected with a control system, and an electric regulating valve is arranged on each of all the water inlets and the water outlets. A control program and a set value of differential pressure between the upper part and the lower part of the fiber bundle filtering layer are inputted in the control system, the differential pressure transmitter is used for detecting the differential pressure between the upper part and the lower part of the fiber bundle filtering layer, transmitting a detected differential pressure signal to the control system for real-time treatment and comparing with the set value, and the control system is used for controlling the water inlets and the water outlets to interchange to realize back flushing when the set value is reached. Through adoption of the full-automatic back flushing fiber bundle filter and the back flushing control method, disclosed by the invention, self-discharge of floating slag and constant pressure full-automatic back flushing can be realized.

Description

technical field

[0001] The invention belongs to the technical field of sewage filtration, and in particular relates to a fully automatic backwashing fiber bundle filter and a backwashing control method for filtering blast furnace slag washing water. Background technique

[0002] During the ironmaking process, coke is burned inside the blast furnace, which melts the iron ore and undergoes a reduction reaction to produce molten iron and blast furnace slag at a temperature of about 1450 °C. After the blast furnace slag and molten iron are separated, the molten iron enters the next production process such as steelmaking; blast furnace slag is the main by-product, which needs to flow out of the blast furnace and be processed. Slag is a good material for making cement. If the slag is not rapidly cooled by water washing, the waste like stone will be obtained. Therefore, iron and steel enterprises generally adopt the water flushing slag process to cool the 1450°C blast furnace slag...

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