Blast furnace fan outlet check valve opening test loop

Abstract

The invention discloses a blast furnace fan outlet check valve opening test loop, and belongs to the technical field of metallurgical blast furnace blast. The device comprises a first fan, a standby fan and a blast furnace, the output end of the first fan is connected with a first air outlet pipeline, the first air outlet pipeline is sequentially provided with a first check valve, a first air outlet valve and a first air supply valve, and a first test pipeline is arranged between the first check valve and the first air outlet valve; the output end of the standby fan is connected with a second air outlet pipeline, the second air outlet pipeline is sequentially provided with a second check valve, a second air outlet valve and a second air supply valve, and a second test pipeline is arranged between the second check valve and the second air outlet valve. The device is simple in structure, convenient to operate, safe and reliable, the opening test can be performed on the fan outlet check valve off line after the fan is started, the blast furnace production is not influenced, and the problem that the check valve cannot be opened during air supply or fan switching is avoided.

Description

technical field [0001] The invention relates to the technical field of blast furnace blasting in metallurgy, and more particularly, to a test loop for opening a check valve at the outlet of a blast furnace fan. Background technique [0002] The blast furnace fan outlet air duct is provided with a check valve to prevent the fan from reversing and damaging the unit when the air supply is interrupted by the fan failure. It is an important safety protection device for the blast furnace fan. The check valve generally adopts an eccentric butterfly valve with a pneumatic closing function. The offset between the rotation center of the valve and the horizontal center line of the valve shell is to meet the requirement that the valve plate can automatically rotate (open) when the fluid flows forward. The sealing surface on the valve shell and the sealing ring on the valve plate are processed into a conical shape, which is equivalent to the chamfered part of the cone frustum, and the co...

AI Technical Summary

Problems solved by technology

[0003] After the check valve is closed, it may be difficult to open it in some cases, especially when the fan is reversed, the pressure difference between the front and rear of the check valve is generally only 0.01MPa, and if the check valve cannot be opened, the fan cannot supply air normally after starting

Reasons why the check valve cannot be opened: First, when the fan trips, the check valve closes quickly under the high wind pressure of the pipe network, which will cause the valve to close too tightly; second, in the air supply system of multiple fans, The backup fan is mainly isolated from the main air supply pipe by the check valve. The check valve bears the reaction force of the pressure of the air supply pipe network and the force of the closing cylinder for a long time, causing the valve to close t

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