Online monitoring method for energy efficiency of drying part of paper machine

A drying section and paper machine technology, applied in the field of paper industry, can solve problems such as difficult online monitoring

CN111926606AActive Publication Date: 2020-11-13QUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-11-13

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Abstract

The invention discloses an online monitoring method for the energy efficiency of a drying part of a paper machine. The method comprises the following steps: based on material and energy conservation in the process of drying, establishing a quaternary partial differential equation set process model with paper temperature (Tp) and humidity (u) at a monitoring part of the drying part and temperature(Ta) and humidity (AHa) of air in a bag area at the monitoring part as unknown quantities; then using process data which are easily acquired in real time in the actual papermaking drying production process as known quantities, initial values and boundary conditions; and solving the quaternary partial differential equation set process model established in the invention to obtain real-time data of key technological parameters of the papermaking drying part, and then calculating the energy efficiency of the papermaking drying part so as to realize online monitoring of energy efficiency of the paper drying process. Thus, black-box operation is avoided, the operation condition of the papermaking drying part can be accurately mastered, and the method has important significance in guiding production adjustment and achieving energy conservation and emission reduction.
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Description

technical field

[0001] The invention relates to an online monitoring method for the energy efficiency of a drying section of a paper machine, and belongs to the technical field of paper making industry. Background technique

[0002] Papermaking is an energy-intensive industry and one of the four major energy-intensive industries in the world. In my country, the energy consumption of the papermaking industry ranks first in light industry energy consumption, and the task of energy conservation is very urgent. The drying section is the process with the highest energy consumption of the paper machine, accounting for about 60% of the total energy consumption of the paper machine, and is the focus of energy-saving work in the paper industry. The drying section is a complex system involving multiple materials (steam, air, paper, etc.) and multiple processes (heat transfer process and mass transfer process). Help enterprises achieve more efficient production management.

[0003] ...

Examples

Embodiment

[0131] 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 quantity is 105-145g / m 2 corrugated paper. The paper machine adopts a double-row multi-dryer drying section, with a total of 48 drying cylinders (see attached Figure 6 ), the drying cylinder with a diameter of 1.5m is equipped with a spoiler bar and a fixed siphon. The steam condensate subsystem adopts a typical three-stage decompression type, #23~#48 dryers are the main steam section (I section), #10~#22 dryers are the intermediate steam section (II section), #1~# 9 is the wet section steam section (III section). The ventilation and waste heat recovery subsystem adopts a closed air hood.

[0132] The types of drying cylinders are shown in the table below:

[0133]

[0134]

[0135] Online collection of paper machine speed (V), paper weight (BW o ), paper mois...