Automatic control method of desulfurization wastewater spray evaporator

Abstract

The invention discloses an automatic control method of a desulfurization wastewater spray evaporator. The automatic control method comprises the following steps: 1) determining an evaporator flue gasflow-spray water volume curve; 2) according to the current unit operation load, setting the spray water quantity Q and the initial values Q0 and T0 of the evaporator body temperature T, according to the evaporator flue gas flow-spray water quantity curve determined in the step 1), calculating to obtain flue gas flow rate Y0, and adjusting an evaporator inlet flue gas gate to enable the flue gas flow Y to be equal to Y0; 3) when the temperature T of the flue gas in the evaporator body is greater than or equal to T0, reducing the opening degree of a flue gas gate at an evaporator inlet so as toreduce the flow rate of the flue gas entering the evaporator body; and 4) when the temperature T of the flue gas in the evaporator body is lower than T0, increasing the opening degree of the flue gasgate at the evaporator inlet to increase the flow of the flue gas entering the evaporator body, thereby stabilizing the temperature of the flue gas in the evaporator body to be close to an initial value T0 through the measurement-adjustment circulation, and realizing the automatic control of the evaporator.

Description

technical field [0001] The invention belongs to the field of waste water treatment and relates to an automatic control method for a desulfurization waste water spray evaporator. Background technique [0002] Thermal power plants usually use limestone-gypsum wet flue gas desulfurization, and the slurry in the desulfurization absorption tower is recycled repeatedly, and is continuously concentrated during this process. In order to ensure desulfurization performance and maintain the balance of chloride ions in the system, it is necessary to continuously replenish water and discharge a certain amount of slurry , while producing desulfurization wastewater containing heavy metal ions. The composition of desulfurization wastewater is complex, mainly containing high-concentration suspended solids, supersaturated sulfate and various heavy metal impurities, many of which are the first type of pollutants that are strictly controlled in the national environmental protection standards. ...

AI Technical Summary

Problems solved by technology

However, in the practical application of this technology, there are problems such as fouling and corrosion in the flue or equipment to varying degrees. The spray drying process has a great impact, and the spray water volume cannot be adjusted accurately in time, resulting in problems such as incomplete evaporation and wall adhesion of the system, which affect the normal operation of the process