A temperature control system for converter dry dedusting evaporative cooling tower

Abstract

The invention discloses a temperature control system for converter dry dedusting evaporative cooling towers. By adjusting the water spray volume and spray particle diameter of the dual-medium sprayer in the evaporative cooling tower, the outlet temperature of the evaporative cooling tower is controlled to reach the set temperature. Among them, the cascade PID adjustment can eliminate the influence of external interference on the evaporative cooling tower system and the cooling water flow control valve; the self-learning ability of the neural network is used to optimize the water volume correction coefficient, which solves the problem of fixed PID parameters that cannot be adjusted The problem of using the fuzzy controller and according to the difference between the outlet temperature and the set temperature and the rate of change of the difference, the corresponding compensation is made to the calculated water volume, which solves the problem of PID controller adjustment lag; the present invention is for dual-medium sprayers The control precision of the water spray volume is very high, so that the outlet temperature of the evaporative cooling tower is basically kept within a reasonable range of the set temperature fluctuations, which can adapt to various working conditions and improve the dust removal efficiency and dust removal effect.

Description

technical field [0001] The invention relates to the technical field of converter dry dust removal, in particular to a temperature control system for an evaporative cooling tower for converter dry dust removal. Background technique [0002] The furnace gas produced by converter steelmaking is mainly composed of carbon monoxide, and the temperature is generally in the range of 1400°C to 1600°C. Dry dust removal uses a gas-liquid mixed dual-medium sprayer to contact water mist with high-temperature flue gas for heat and mass transfer, so that the temperature quickly drops to the temperature required for electrostatic dust removal (about 200 ℃) in a short time, while the flue gas 30% to 50% of the coarse dust particles gather at the bottom of the evaporative cooling tower and are discharged by the chain conveyor. The cooled flue gas is then passed through an electrostatic precipitator for fine dust removal. [0003] The core of dry dust removal is temperature control, especial...

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Problems solved by technology

[0004] In the industry, the traditional way of regulating the outlet temperature of the evaporative cooling tower by only using the PID controller to control the temperature often has the following deficiencies: 1. The external interference on the opening of the regulating valve cannot be effectively resolved, resulting in excessive water spraying or If it is too low, it will affect the outlet temperature; 2. It cannot adapt to every working condition. In the oxygen-on stage of blowing, the inlet temperature and flue gas flow fluctuate sharply, and the PID adjustment has a certain hysteresis. Water spraying in the early stage of blowing The volume is difficult to meet the control requirements, and the outlet temperature fluctuates greatly

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