Method for realizing three-position type limit value control of ash pipe pressure pulse quantity

Abstract

The invention belongs to the technical field of engineering control, and particularly relates to a method for realizing ash pipe pressure pulse quantity three-position type limit value control, after the ash pipe pressure pulse quantity three-position type limit value control method is implemented, the ash pipe pressure control effect is good, and by adopting the ash pipe pressure pulse quantity three-position type limit value control method, the ash pipe pressure control effect is good. The three-position limit value control of the pressure pulse of the ash pipe is accurately realized, and the pressure of the ash pipe is well controlled, so that the pipe blockage fault is completely eliminated, the pipe leakage fault is obviously reduced, and the problems of pipe blockage and pipe leakage of the ash conveying pipeline in the ash removal production process are well solved. The method has good energy-saving, consumption-reducing and environment-protecting effects, and gains considerable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of engineering control, and in particular relates to a method for realizing three-position limit control of the pressure pulse amount of an ash pipe. Background technique [0002] In the positive pressure pneumatic ash removal production system of coal-fired boilers at home and abroad, the pressure of the ash conveying pipeline is the key control variable in the ash removal production process. The ash removal process adopts a cyclic working mode. There are five stages: pressurization stage, conveying stage, cleaning stage and waiting stage, and the process is controlled by timing sequence control method. In the timing sequence control mode, the waiting time of the waiting stage is set to a fixed value, and each process control is executed in sequence according to the sequence of the waiting process, the feeding process, the pressurization process, the conveying process and the cleaning process. The ash pipe...

AI Technical Summary

Problems solved by technology

Because the gray pipe pressure variable is a pulse quantity, there is an upward change process starting from zero value and a downward change process ending at zero value in the pulse quantity change, using this existing three-position limit value control method for continuous variables to control the The ash tube pressure implements limit value control. When the ash tube pressure is zero and its up and down changes, the DCS controller will output the corresponding control amount in real time according to the limit value range of the real-time measured value of the ash tube pressure, and the control The amount will also be continuously manipulated to change the timing value of the waiting time. Obviously, this existing three-position limit value control method cannot meet the principle requirements of the three-position limit value control of the gray pipe pressure pulse volume. Therefore, using the existing three-position limit value control method The limit value control method cannot realize the three-position limit value control of the ash pipe pressure pulse volume, and it is difficult to solve the frequent blockage and leakage of the ash conveying pipeline.

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