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Online monitoring method for key process parameters of drying cylinder of paper machine

A technology of process parameters and paper machines, which is applied in the field of paper industry, can solve problems such as difficult online monitoring, achieve accurate operating conditions, and avoid the effect of "black box" operation

Active Publication Date: 2021-06-04
QUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that it is difficult to monitor online during the paper drying process in the drying section of the paper machine, the purpose of the present invention is to provide an online monitoring method for the key process parameters of the drying cylinder of the paper machine

Method used

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  • Online monitoring method for key process parameters of drying cylinder of paper machine
  • Online monitoring method for key process parameters of drying cylinder of paper machine
  • Online monitoring method for key process parameters of drying cylinder of paper machine

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Embodiment

[0119] The test object is the drying section of a paper machine that produces corrugated paper. The design capacity is 100,000 tons / year, the design speed is 500m / min, the width is 4m, and the main production weight is 105-145g / m 2 corrugated paper. The paper machine adopts a double-row multi-drying cylinder drying section, with a total of 48 drying cylinders (see appendix for details). Image 6 ), the dryers with a diameter of 1.5m are equipped with spoilers and fixed siphons. The steam condensate subsystem adopts a typical three-stage pressure reduction type, #23~#48 dryer is the main steam section (I section), #10~#22 dryer is the middle steam section (II section), #1~# 9 is the wet-stage steam section (section III). The ventilation and waste heat recovery subsystem adopts a closed air hood.

[0120] The types of dryers are shown in the table below:

[0121]

[0122]

[0123] Online collection of paper machine speed (V), paper basis weight (BW) o ), paper moistur...

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Abstract

The invention relates to a divisional application of an invention with the application number being 202010752659.8. The invention discloses an online monitoring method for key process parameters of a drying cylinder of a paper machine, which comprises the steps of establishing a quaternary partial differential equation set process model which takes the temperature (Tp) and the humidity (u) of paper at a monitoring part of a drying part and the temperature (Ta) and the humidity (AHa) of air in a bag area at the monitoring part as unknown quantities through conservation of materials and energy in the drying process, then taking process data which is easily acquired in real time in the actual papermaking drying production process as a known quantity, an initial value and a boundary condition, and solving the quaternary partial differential equation set process model established in the invention to obtain real-time data of key process parameters of a papermaking drying part, thereby achieving online monitoring of the paper drying process, avoiding black box operation, being capable of accurately mastering the operation condition of the drying part of the paper machine, and providing possibility for evaluation of the drying capacity and the energy efficiency level of the drying part of the paper machine.

Description

[0001] The present invention is a divisional application of the Chinese application with the application number of 202010752659.8 and the application date of July 30, 2020. The invention and creation name is "an online monitoring method for the energy efficiency of the drying section of a paper machine", and the applicant is "Quzhou University". technical field [0002] The invention relates to an on-line monitoring method for key process parameters of a drying cylinder of a paper machine, and belongs to the technical field of the papermaking industry. Background technique [0003] Papermaking is an energy-intensive industry and is one of the four major energy-intensive industries in the world. In my country, the energy consumption of the paper industry ranks first in the energy consumption of the light industry, and the task of energy saving is very urgent. The drying section is the process with the highest energy consumption in the paper machine, accounting for about 60% o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F5/04D21G9/00G06F30/20G06F17/11
CPCD21F5/04D21G9/0054G06F30/20G06F17/11Y02P70/10
Inventor 陈晓彬董云渊郑启富
Owner QUZHOU UNIV
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