Control method of humidification water ratio in semi-dry flue gas desulfurization process
A technology of desulfurization process and control method, applied in the direction of separation method, self-adaptive control, general control system, etc., can solve the problems of unable to humidify water and desulfurization dose maintenance, fluctuation, etc., to improve tracking performance, improve economy, reduce small pulsation effect
Active Publication Date: 2020-12-25
河北众源环保科技有限公司
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[0006] The traditional method is to control the desulfurization agent-humidification water ratio, but the ratio control has a fatal flaw, that is, it cannot maintain the optimal ratio of humidification water and desulfurization dosage. The main reason is that during the reaction process, the desulfurization agent The quality is not consistent, there will be more or less fluctuations
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[0055] like figure 1 and figure 2 As shown, the control method of the humidification water ratio in the semi-dry flue gas desulfurization process of the present invention comprises the following steps: the control method of the humidification water ratio in the semi-dry flue gas desulfurization process is characterized in that it includes the following steps Steps: 1. Use the flue gas temperature at the outlet of the absorption tower as the correction signal of the self-optimization control system for the desulfurizer-humidifying water ratio control to form a feedback system; The agent flow signal is added to the control scheme as a feedforward link to form a feedforward-feedback cascade control system; 3. In order to improve the response speed of the control system, an adaptive filter is designed using the RLS least squares algorithm, based on the heat signal Filter the radiant energy signal; 4. Add the filtered radiant energy signal as another feedforward link to the contr...
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The invention provides a control method of humidification water ratio in a semi-dry method flue gas desulfurization process. The method comprises the following steps of 1, using the temperature of absorption tower outlet flue gas as a control signal of a desulfurizer-humidification water ratio controlling self-optimizing control system, thereby forming a feedback system; 2, simultaneously, in consideration of influence of desulfurizer fluctuation, adding a desulfurizer flow signal as a feedback element into a control solution, thereby forming a feedforward-feedback cascade control step; 3, forimproving control system reaction speed, designing an adaptive filter by means of an RLS least square algorithm, filtering a radiation energy signal based on heat signal; and 4, adding the filtered radiation energy signal as another feedforward element into the control solution, wherein the radiation energy signal is obtained through performing calculation on a flame image which is acquired by means of a hearth flame image detector of a boiler field detecting system according to a colorimetric temperature measurement principle. According to the control method of the invention, the hearth radiation energy signal and the desulfurizer flow signal after filtering are used as the feedforward-feedback cascade control system which is composed of the feedforwawrd elements, thereby realizing advantages of high control quality, high economic performance, small pulsation and no mis-action.
Description
technical field [0001] The invention relates to a method for controlling the ratio of humidifying water, in particular to a method for controlling the ratio of humidifying water in a semi-dry flue gas desulfurization process with high quality, high economy, small pulsation and no malfunction. Background technique [0002] The reduction of AAST (near adiabatic saturation temperature) can promote the improvement of desulfurization efficiency, mainly because the lower the AAST, the greater the moisture content of flue gas, which creates favorable conditions for the progress of desulfurization reaction. increases, the droplet drying time is long, prolonging the SO in the flue gas 2 The reaction time with the desulfurizer in the liquid phase ion state, the liquid phase ion reaction rate is thousands of times faster than the gas-solid adsorption reaction after drying. [0003] However, from the perspective of process flow, AAST is not as low as possible. Low AAST means that the h...
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IPC IPC(8): G05B13/04B01D53/50B01D53/80
CPCB01D53/50B01D53/80G05B13/042
Inventor 程亮
Owner 河北众源环保科技有限公司