Paper machine control method, control device, program and storage medium

Abstract

A paper machine control device capable of preventing by means of a simple and low-cost configuration problems such as hunting by mutual interference between a retention control and an in-paper ash content control even when the both controls are performed at a short control frequency in a paper machine, and controlling a retention and an ash content with a good accuracy A retention and an in-paper ash content in at least wet part (2a) are controlled by an automatic control system (3) in a papermachine (1). This automatic control system (3) comprises a feedback loop for automatically controlling the retention, a feedback loop for automatically controlling the in-paper ash content, and a non-interference control unit (30) incorporated between the both feedback loops so as to cancel out effects by the mutual interference between the both feedback loops.

Description

technical field [0001] The present invention relates to a control method of a paper machine and a control device of a paper machine, in particular to improvement of retention in the wet end of a paper machine and control of ash content in paper. Background technique [0002] In recent years, there has been such a technical trend that, during the operation of the paper machine in the pulp industry, retention control is added to the wet part process (wet part process) that has a great influence on product quality, and through The stabilization of the wet end of the paper machine leads to improved operability and improved product quality. [0003] The retention in the wet end process of the paper machine refers to the pulp raw material (mainly pulp, including ash) sprayed from the head box of the paper machine to the filter screen of the wire part (wire part). Ratio of raw material utilized on the screen, available concentration of raw material supplied to the headbox (C HB )...

AI Technical Summary

Problems solved by technology

[0021] However, as mentioned above, when the retention control and the ash content control are implemented at the same time, the following problems will occur: the two kinds of control will interfere with each other, and hunting occurs in the control end in the ash content control, resulting in a change in the ash content. Larger, but reduces the stability

The reason is that in the past, the increase and decrease of the addition rate of the utilization rate accelerator was controlled by using a PID controller in a short cycle, and there was concern about whether the quality of paper products (changes in unit paper weight) would deteriorate.

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