Adjusting device and method for injection flow rate of evaporative cooling tower during dry converter dedusting

Abstract

The invention discloses an adjusting device and an adjusting method for the injection flow rate of an evaporative cooling tower during dry converter dedusting and especially relates to control of the injection flow rate of an evaporative cooling tower during dry converter dedusting in the industries of metallurgy steel-making. The device comprises an electromagnetic flowmeter, a cooling water pressure detector, a cooling water pressure alarm instrument, a shut-off valve, a flow control valve, an evaporative cooling tower, an inlet temperature detector and an outlet temperature detector. The adjusting method comprises open loop control in an initial stage of converting and closed loop PID control when the temperature of flue gas tends to be stable. Open loop control realizes signal transmission mainly through connection of control signals of the electromagnetic flowmeter, the shut-off valve, the flow control valve and the outlet temperature detector with a PLC system to so as to allow water flow to vary with the temperature of flue gas, and therefore, water supply in the whole control process is balanced and the purpose of automatic control and adjustment of the injection flow rate is achieved.

Description

technical field [0001] The invention relates to a device and a method for adjusting the water spray volume of a converter dry dedusting evaporative cooling tower, in particular to the control of the water spray volume of a converter dry dedusting evaporative cooling tower in the metallurgical steelmaking industry. Background technique [0002] In the metallurgical and steelmaking industry, the core of dry dust removal is temperature control. There is a flow regulating valve on the water supply pipe of the converter dry dedusting evaporative cooler, and it starts to be put into operation after the converter blows oxygen. The general control method is to first set the regulating valve to a preset opening, and then wait for a period of time. Switch to PID control. However, since the amount of sprayed water is related to the temperature of the converter flue gas, in the early stage of blowing, the temperature of the flue gas is rising rapidly, so the corresponding cooling water...

AI Technical Summary

Problems solved by technology

However, since the amount of sprayed water is related to the temperature of the converter flue gas, in the early stage of blowing, the temperature of the flue gas is rising rapidly, so the corresponding cooling water flow setting value is also increasing, but if the regulating valve is put into PID automatic control too early , because the set value changes too fast, the valve action cannot keep up with the changing temperature, and if the open-loop control is adopted in the initial stage and set at a fixed valve position, there may be too much water in the initial stage, but not enough water in the later stage Happening

[0003] If there is too much water in the initial stage and the temperature of the airflow is low, the generated dust will be compacted, which will affect the dust removal efficiency of the dust collector. What is more serious is to aggravate the corrosion of the equipment in the electric field and reduce the service life of the equipment; , causing additional burning loss of the equipment and reducing the dust removal effect of the electric field

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