Online switching process for blast furnace blowers

Abstract

The invention discloses an online switching process for blast furnace blowers. The online switching process comprises the following steps that (1) when molten iron is output from a blast furnace, a standby blower is started, and the wind outlet pressure of the standby blower is regulated to F+(4-6) kPa, wherein F is equal to 70-75% of the wind outlet pressure of a main blower before the molten iron is output from the blast furnace; (2) after the molten iron is output from the blast furnace, the wind outlet pressure of the main blower is regulated to the value of F selected in the first step, and a wind supply valve and a communication valve in a standby wind supply pipe network are opened; and (3) under the condition that wind outlet pressure fluctuation of the main and standby blowers iscontrolled at + / -5 kPa, a valve on a diffusion pipeline in the standby wind supply pipe network is gradually closed, a valve on a diffusion pipeline in a main wind supply pipe network is gradually opened at the same time until a check valve on a wind supply pipeline in the main wind supply pipe network is automatically closed due to the decreased wind volume, and then a wind supply valve and a communication valve in the main wind supply pipe network are closed. By means of the online switching process, the main and standby blowers can be switched online in stable, rapid and safe modes.

Description

technical field [0001] The invention relates to the field of blast furnace ironmaking, in particular to an online switching process of a blast furnace blower. Background technique [0002] In the blast furnace smelting process, the blast furnace blower is the main equipment that provides air and pressure for the blast furnace smelting. If the blower has a major safety hazard, the blast furnace will face the danger of blown air and slag filling. The usual practice is to shut down the blast furnace's unplanned wind, shut down the main blower of the blast furnace, and prepare the standby blower for start-up 2 hours before the re-airing of the blast furnace. Blast furnace blower shutdown switching requires blast furnace shutdown, which takes a long time, affects the smooth operation of the blast furnace, increases the operating cost of the blast furnace, and reduces the output of molten iron of the blast furnace. In the case of unfavorable conditions of the blast furnace, if th...

AI Technical Summary

Problems solved by technology

Blast furnace blower shut down switch, need to shut down the blast furnace, which takes a long time, affects the smooth running of the blast furnace, increases the operating cost of the blast furnace, and reduces the molten iron output of the blast furnace

In the case of unfavorable conditions of the blast furnace, if the blast furnace is not allowed to shut down, the main blower will not be able to stop and go offline for processing, which increases the hidden danger of hidden unit failure

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