Pressure release control method and system for vaporization cooling deaerator

Abstract

The invention provides a method and a system for controlling pressure release of a novel evaporative cooling deaerator. The control system comprises the deaerator, wherein a pressure transmitter, a PLC (Programmable Logic Controller) and a release valve are arranged on the deaerator; the pressure transmitter and the release valve are respectively connected with the PLC; the pressure transmitter is used for measuring pressure of the deaerator; the release valve on the deaerator adopts two pneumatic cut-off valves; and the PLC is used for controlling the on and the off of the two pneumatic cut-off valves through the pressure measured by the pressure transmitter. A nominal diameter of one pneumatic cut-off valve is large, and a nominal diameter of the other pneumatic cut-off valve is small. The method and the system for controlling pressure release of the novel evaporative cooling deaerator have the beneficial effects that the characteristic of quick on and off actions of the pneumatic cut-off valves is utilized, and the two pneumatic cut-off valves are adopted to control the release of the pressure of the deaerator in stage, so that the problems of fast pressure drop and unstable pressure control after the evaporative cooling deaerator is released are solved, the deoxidizing effect is enhanced, and meanwhile, the vapor recovery time and the vaporization flue life are increased.

Description

technical field [0001] The invention relates to a steelmaking process in the metallurgical industry, in particular to a pressure release control method and system for a vaporization cooling deaerator. Background technique [0002] In the converter steelmaking process, the vaporization cooling system is an important link to ensure the cooling of the fume hood. It can also recover heat to generate steam during the converter steelmaking process, reducing the production cost of the enterprise. The life of the vaporization flue is one of the important indicators for the assessment of the vaporization cooling system. To ensure the life of the vaporization flue, the oxygen content of the flue circulating cooling water must be reduced, and the deaerator is the key equipment for the flue circulating cooling water. The deaerator relies on steam to heat the circulating cooling water. Generally, it is advisable to control the pressure inside the deaerator at 0.2MPa~0.3MPa, and control ...

AI Technical Summary

Problems solved by technology

Since the action of the electric relief valve 6 is slow, when the electric relief valve 6 is opened initially, the pressure drop of the deaerator 1 is not obvious. The pressure of the oxygen tank 1 drops too fast, the water temperature in the oxygen tank 1 drops, the oxygen removal effect is not good, and the oxygen removal efficiency is affected

Since the opening and closing range of the electric relief valve 6 of the deaerator is too small, the electric relief valve 6 moves frequently, and the valve is easily damaged, causing a great burden on production and maintenance.

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