Operation method of nitrogen interlocking control system for detection of upper and lower furnace pressure in hot-dip galvanizing vertical annealing furnace

Abstract

The present invention proposes the operation method of the nitrogen interlocking control system for the upper and lower furnace pressure detection of the hot-dip galvanizing vertical annealing furnace. Two furnace pressure detection instruments are arranged in each of the preheating section, heating section, slow cooling section and rapid cooling section of the annealing furnace. A furnace pressure detection instrument is installed in the horizontal steering section; each section detects changes in the furnace pressure and the nitrogen pressure of the inlet sealing roller, and the actual pressure is lower than the set value pressure in one section, triggering the alarm unit and the opening of the nitrogen flow regulating valve Make remedial adjustments to ensure that the furnace pressure is normal. Adjusting the nitrogen flow rate to the maximum value affects production or can affect the nitrogen pressure and flow limit threshold of the main pipe and cannot meet the production conditions, trigger the shutdown cooling mode. Beneficial effects: the furnace pressure detection arranged up and down can more accurately monitor the distribution of the annealing furnace pressure, and can deal with existing problems in time.

Description

technical field [0001] The invention belongs to steel annealing equipment, and relates to an operation method of a nitrogen interlocking control system for detection of upper and lower furnace pressures of a hot-dip galvanizing vertical annealing furnace. Background technique [0002] The detection of the furnace pressure of the hot-dip galvanizing continuous vertical annealing furnace usually uses a fixed point at the top or bottom of an area to set a furnace pressure detection point to detect the atmosphere inside the furnace, but the leakage at the bottom or top of the furnace cannot be detected in the shortest time. It is necessary to judge where the leakage actually occurs within a short period of time, and the inspection time is prolonged, which greatly increases the safety risk of the annealing furnace. If necessary, it needs to be shut down to deal with the leakage point before the problem is solved. Shutdown treatment is very harmful to the annealing furnace. When t...

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Problems solved by technology

[0002] The detection of the furnace pressure of the hot-dip galvanizing continuous vertical annealing furnace usually uses a fixed point at the top or bottom of an area to set a furnace pressure detection point to detect the atmosphere inside the furnace, but the leakage at the bottom or top of the furnace cannot be detected in the shortest time. Judging where the leakage actually occurs within a short period of time, the inspection time is prolonged, and the safety risk to the annealing furnace is greatly increased. If necessary, it needs to be shut down to deal with the leakage point before the problem is solved.

Shutdown treatment is very harmful to the annealing furnace. When the external cold air enters the annealing furnace, the first impact is the refractory material, inner lining and furnace rolls of the annealing furnace. The secondary impact of the roller surface and the inspection sensor will permanently damage the equipment in the annealing furnace. The cost of repairing and maintaining the equipment is high, and the maintenance cost is often higher than the purchase of new equipment. The construction time is long, and the function of the equipment drops below the normal value. Overhaul has a greater impact

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