Paper Drying Steam Recovery With Dual Separation and One Pump
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Solution Overview
Problem
Existing paper drying systems face issues with low-quality steam recovery due to the presence of condensate, leading to unstable steam supply and decreased desiccating capacity, and require complex pump systems for condensate management.
Innovation Solution
A paper drying plant with a simplified design using a single pump system and two separating tanks to separate and purify steam from condensate, allowing high-pressure and high-temperature steam to be reused, and an adjustment system to control steam temperature and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If steam is generated from biphasic products in existing recovery systems, then energy recovery is achieved, but the steam quality is low and the system complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for the second pump from the system by redesigning the fluid circulation path. The pump is removed from the second circuit while maintaining its functional equivalent through the redesigned flow path, thereby reducing device complexity while preserving energy recovery capabilities.
Solution Approach 2:
The system segments the steam generation and separation processes into distinct functional zones within the heat exchanger and separating tanks. This segmentation allows for optimized steam quality production without requiring additional pumping equipment, resolving the contradiction between energy recovery efficiency and plant complexity.
2Quantity of substance
If a second pump is added to send condensate to the heat exchanger, then steam production is enabled, but the plant complexity increases
Solution Approach 1:
The invention merges the functions of condensate circulation and steam generation into a unified system where the first pump serves both circuits through a redesigned flow path. This consolidation eliminates the need for a second pump while maintaining adequate steam production, thereby reducing device complexity.
Solution Approach 2:
The first pump is designed to perform multiple functions by circulating fluid through both the first and second circuits sequentially. This multi-functionality allows the system to maintain steam production capabilities without adding a dedicated second pump, resolving the contradiction between quantity of substance and device complexity.
3Loss of energy
If steam is separated from biphasic product, then steam recovery is achieved, but the steam quality is low due to liquid content
Solution Approach 1:
The system performs preliminary separation of steam from condensate in the first separating tank before the heat exchanger. This preliminary action ensures that only vapor phase enters the heat exchanger for heating, and the condensed liquid is separately managed, thereby producing high-quality steam without liquid contamination while maintaining efficient heat recovery.
Solution Approach 2:
The heat exchanger acts as an intermediary device that heats the condensed liquid from the first separating tank, causing it to vaporize and mix with the separated steam in the second separating tank. This intermediary heating process ensures complete vaporization and high-quality steam production while maintaining energy recovery efficiency.
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
The system produces high-quality steam efficiently, stabilizes steam supply, and simplifies the plant structure by eliminating the need for additional pumps, enhancing energy recovery and desiccating capacity.
Implementation Method 1
a heat exchanger (104) which heats the condensate from the first tank (101)
Implementation Method 2
with a bypass system to adjust temperature and pressure, producing high-quality, high-temperature steam
Implementation Method 3
a first and second separating tank, where steam is separated from condensate
Data Source
Figure 1
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AI summary
The present invention relates to a drying plant for desiccating paper material, preferably in the form of a tape, the said drying plant comprising: - At least one drying roll (112) fed with steam in such a way as to heat up and on which the paper material to be dried is arranged in use; - At least one hood (114) arranged in such a way as to wrap, at least partially, the said drying roll, the said hood being configured in such a way as to send onto the said drying roll a drying airflow which hits the said drying roll and being further configured to suck in the damp drying flow going up in use from the paper material under drying positioned on the said drying roll; - At least one first separating tank (101) configured to separate the steam from the condensate and placed into fluid communication with the said drying roll in such a way as to receive the fluid coming from the said drying roll and separate steam from condensate; - and wherein a heat exchanger (104) is comprised; - said heat exchanger being placed into fluid communication with said first separating tank through a first part of a conduit (103) which connects said first separating tank with said heat exchanger; - and wherein a pump (102) arranged along the said first part of conduit is comprised, the pump being therefore interposed between said heat exchanger and the first tank and with the said pump configured to push the condensate contained into said tank towards the heat exchanger; - Characterized by the fact of comprising a second tank (108), said second tank being a second separating tank configured to separate steam from condensate and placed into fluid communication with the said heat exchanger through a second part of a conduit (107), said second part of conduit being without pump, the said pump arranged in the first part being configured in such a way as to push the condensate coming from the first separating tank into the heat exchanger (104) and contextually push the consequent fluid obtained from said heat exchanger towards the second separating tank (108), the said second tank being connected to a third part of a conduit (109) configured to send the steam, separated from the condensate, in outlet from said second separating tank, said third part of conduit connecting to the said drying roll (112) in such a way that the drying roll can receive the obtained steam and coming from said second separating tank and wherein, further, the said second separating tank provides an outlet for discharging condensate.