Method for controlling water jet capacity of once dry-method dedusting evaporation cooling tower in converter steelmaking

Abstract

The invention provides a method for controlling water jet capacity of a once dry-method dedusting evaporation cooling tower in converter steelmaking. According to the converter blowing process, the outlet fume temperature of the evaporation cooling tower is measured in real time; the outlet fume temperature of the evaporation cooling tower is divided into a plurality of continuous and equant temperature ranges; and water is respectively jetted within each temperature range according to preset fixed water jet capacities through a dry-method dedusting main PLC (Programmable Logic Controller) through a water jet capacity adjusting system. The method has the beneficial effects that firstly, the control scheme is simplified, the regulation is simple, and the on-site regulation personnel are not highly required; secondly, the water jet capacity control logic in the once dry-method dedusting system in converter steelmaking is simplified, and the investment on devices such as a heavy caliber flow measuring instrument, an evaporation cooling tower inlet fume temperature tester and the like at a static deduster outlet is saved; and thirdly, the problem that a closed loop control system is not accurate in water capacity calculation at the early blowing period and at the end blowing period is avoided.

Description

technical field [0001] The invention relates to a method for controlling the water spray volume of a primary dry dedusting evaporative cooling tower in a converter furnace in the metallurgical industry. Background technique [0002] In the converter steelmaking primary dry dedusting system, the control of the water spray volume of the evaporative cooling tower has always been an important and difficult point. The main purpose of the evaporative cooling tower spray system for primary dust removal is to reduce the temperature of the flue gas to ensure that the temperature of the flue gas when passing through the electrostatic precipitator cannot be too high (not exceeding 250°C, otherwise it will affect the life of the electrostatic precipitator), nor can it be too low ( If the temperature is too low, the water vapor contained in the flue gas will condense into water, causing the dust in the dust collector to agglomerate). At present, the commonly used control scheme is the c...

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Problems solved by technology

However, this control scheme has the problem of large project investment: the price of the large-diameter flowmeter installed at the outlet of the electrostatic precipitator is relatively high. For some projects that are short of project investment, especially for projects that do not need gas recovery to measure flue gas There is no need to design a flue gas flow meter; and this cascade PID adjustment mode also has unstable control of the initial and final water spraying of the evaporative cooling tower (the amount of water converted according to the flue gas flow and the temperature difference between the inlet and outlet of the evaporative cooling tower In the early stage of debugging, it is often not allowed, and the technical level and experience of the on-site debugging personnel are often required to be relatively high) and the difficulty of debugging is relatively high.