Cellulose Pulp Dryer Blow Box Opening Design

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Solution Overview

Problem

Existing cellulose pulp drying systems face challenges in increasing drying capacity without expanding their size, necessitating more efficient heat transfer and web fixation mechanisms.

Innovation Solution

The cellulose pulp drying box incorporates blow boxes with non-inclined openings of 1.8 to 3.1 mm, constituting at least 20% of the total degree of perforation, to enhance heat transfer and web fixation, allowing for more efficient drying of cellulose pulp while maintaining a compact design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the size of the cellulose pulp dryer is increased to increase drying capacity, then the drying capacity increases, but the space efficiency deteriorates

Engineering Contradiction:

Improvedrying capacityVSAvoiddryer size

Core Design Contradiction:

ProductivityVSVolume of stationary object

Solution Approach 1:

The invention changes the parameters of the blow box openings by introducing a specific size range (1.8 to 3.1 mm) and a minimum proportion (20% of total perforation area). This parameter optimization improves heat transfer efficiency, allowing increased drying capacity within the same dryer volume without requiring physical expansion of the equipment.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If conventional blow box openings are used, then the structure is simple, but the heat transfer efficiency is insufficient

Engineering Contradiction:

Improvestructural simplicityVSAvoidheat transfer efficiency

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The invention optimizes the opening parameters within the blow box face by specifying a characteristic size range (1.8 to 3.1 mm) and minimum area proportion (20%). These parameter changes enhance heat transfer efficiency while maintaining the basic blow box structure, avoiding complex design modifications.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration improves heat transfer efficiency, enabling a larger amount of cellulose pulp to be dried within a given size, with reduced stretching forces on the web and improved fixation, leading to enhanced drying performance.

Implementation Method 1

Hot air is blown onto a web of cellulose pulp by means of upper blow boxes and lower blow boxes. The air blown by the blow boxes transfer heat to the web to dry it.

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 2

at least 10% of the total number of blow boxes of the drying box are provided, in their respective face, with openings having a characteristic measure of 1.8 to 3.1 mm and constituting at least 20% of the total degree of perforation of the face of the respective blow box

Methodology Applied

Scientific EffectForced Convection: Forced Convection

Data Source

PatentUS9057559B2Cellulose pulp dryer having blow boxes, and a method of drying a web of cellulose pulp

Publication Date: 2015.06.16 ANDRITZ TECH & ASSET MANAGEMENT GMBH

AI summary

A cellulose pulp drying box for drying a web of cellulose pulp having blow boxes that are operative for blowing gas towards the web of cellulose pulp for drying the pulp. At least 10% of the total number of blow boxes of the drying box are provided, in their respective face, with openings having a characteristic measure of 1.8 to 3. mm and constituting at least 20% of the total degree of perforation of the face of the respective blow box.