Method and control system for controlling supply of desulfurizing agent for flue gas

Abstract

The invention discloses a method for controlling the supply of a desulfurizing agent for a flue gas. The desulfurizing agent is used for generating a chemical reaction with sulfur dioxide in the flue gas for desulfurization. The method comprises the following steps of S100, measuring the instantaneous flow rate of the flue gas and the concentration of the sulfur dioxide in the flue gas through a gas analyzer, multiplying two measured values to obtain the content of the sulfur dioxide in an instantaneous flue gas; S210, calculating the use level of an effective component of the desulfurizing agent, which is needed by an instantaneous chemical reaction, through a desulfurization chemical equation of the desulfurizing agent; S220, calculating the needed use level of the actually used desulfurizing agent by combining the proportion of the effective component of the actually used desulfurizing agent; S310, comparing the use level, which is obtained through calculation and is needed instantaneously, of the desulfurizing agent with the flow rate of the desulfurizing agent supplied in real time by a slurry supply pipeline, and calculating a difference value; S320, controlling the opening of a valve on the desulfurizing agent slurry supply pipeline according to the difference value. The accurate and high-efficiency control of the desulfurizing agent for the flue gas is realized. The invention also discloses a system for controlling the supply of the desulfurizing agent for the flue gas.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a method for controlling the supply of flue gas desulfurization agents. The invention also discloses a control system for the supply of flue gas desulfurization agents. Background technique [0002] Wet flue gas desulfurization technology is currently widely used in the flue gas treatment system of coal-fired boilers to remove sulfur dioxide, which is harmful to the environment, in flue gas. In this technology, limestone (or lime, the same below) is used as the desulfurizer, and the limestone slurry that meets certain fineness requirements is pumped into the paddle pool at the bottom of the absorption tower (that is, the desulfurization tower). The pipes outside the desulfurization tower are connected to the multi-layer spray pipes arranged in the middle and upper areas of the desulfurization tower. There are many atomizing nozzles arranged on each layer of spray...

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Problems solved by technology

[0004] However, this method is increasingly showing its shortcomings. On the one hand, the volume of the paddle pool of the absorption tower is also relatively large, and the time required from the addition of the desulfurizer to the corresponding change in the adjusted pH value is too long, that is, the target The adjustment characteristics of the desulfurization device are very poor, and over-adjustment often occurs, resulting in unstable desulfurization efficiency, lower limestone utilization rate and lower gypsum purity; the second reason is that with the improvement of emission standards, desulfurization devices are required to have higher desulfurization efficiency. The upper and lower parts of the paddle pool have two different pH values, and any pH value can no longer be used as the basis for judging the amount of paddle supply, so a more accurate and efficient control method must be found

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