Evaporation Dryer Steam Recirculation and Pressure Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Industrial evaporation dryers face challenges in balancing steam requirements between turbines and drying processes, leading to inefficiencies and high costs due to the need for constant steam pressure and limited flexibility in heat exchanger designs.
Innovation Solution
The implementation of a steam jet pump system that recirculates expansion steam from the condensate back into the heating steam, combined with a multi-stage heat exchanger, allows for adjustable steam pressure and increased drying efficiency by utilizing the energy in condensate, reducing the overall steam requirement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If steam pressure is increased in the steam generation unit to meet both turbine and dryer demands, then steam supply quantity is improved, but construction costs increase due to requiring a new boiler house
Solution Approach 1:
The patent changes the pressure parameter of steam by introducing a pressure reduction device that reduces high-pressure steam from the steam generation unit to lower pressure suitable for the evaporative dryer. This allows the existing boiler house to operate at optimal high pressure for turbine generation while the dryer receives appropriately reduced pressure steam, eliminating the need for expensive boiler house upgrades.
2Reliability
If steam pressure is kept constant to feed the turbine, then turbine operation stability is improved, but drying efficiency decreases due to throttling losses
Solution Approach 1:
The patent segments the steam distribution system into two separate pathways: one pathway maintains constant high-pressure steam for the turbine to ensure operational stability, while another pathway introduces a pressure reduction device that creates variable lower-pressure steam for the evaporative dryer. This segmentation allows each system to operate at its optimal pressure without compromising the other, eliminating throttling losses in the drying process.
3Device complexity
If a single heat exchanger is used without condensate recirculation, then device complexity is reduced, but energy utilization efficiency decreases due to wasted condensate heat
Solution Approach 1:
The patent implements a feedback mechanism where condensate from the heat exchanger is recirculated back into the evaporative dryer process chamber. The condensate, which contains significant thermal energy, is pumped back and evaporated again, creating a closed-loop system that continuously recovers and reuses heat energy. This feedback loop dramatically reduces energy loss and improves overall energy utilization efficiency.
Solution Approach 2:
Instead of discarding the condensate from the heat exchanger as waste, the patent recovers its thermal energy by recirculating it back into the process chamber. The condensate is pumped back and used as a heat source for further evaporation of moisture from the material being dried. This recovery process extracts useful energy from what would otherwise be wasted condensate, improving energy efficiency without requiring complex additional heating systems.
4Loss of energy
If a two-stage heat exchanger with recuperator is used, then energy recovery is improved, but device complexity increases due to additional pumps and heat exchanger sections
Solution Approach 1:
The patent employs a self-service approach where the condensate from the heat exchanger serves its own heating function by being recirculated back into the process chamber. Rather than requiring a separate recuperator system with additional pumps and heat exchange surfaces, the condensate itself is pumped back and directly evaporated in the process chamber, providing self-heating and eliminating the need for complex two-stage heat exchanger systems.
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 solution enhances the flexibility and efficiency of the evaporation dryer by optimizing steam usage, reducing the required steam input from the steam generating device and allowing for variable operation based on drying demands, thereby minimizing energy waste and operational costs.
Implementation Method 1
a steam jet pump system that recirculates expansion steam from the condensate back into the heating steam
Implementation Method 2
a heat exchanger arranged within the process chamber with at least one inlet into the heat exchanger for high-pressure steam as heating steam
Implementation Method 3
the energy in condensate... condenses at a comparatively high temperature level due to the relatively high pressure
Data Source
AI summary
The invention relates to an evaporation dryer (1) for drying particles, having - a process chamber (10) with at least one product inlet (11) for supplying the particles to be dried into the process chamber (10) and a product outlet (12) for discharging dried particles from the process chamber (10), - a heat exchanger (20) arranged within the process chamber (10), - having at least one inlet (21, 211) into the heat exchanger (20) for pressurized steam as process steam and at least one condensate outlet (22, 222) from the heat exchanger (20), wherein - the at least one condensate outlet (22, 222) is connected to an expansion tank (30), wherein at least one pump (40) is connected to the expansion tank (30), and the expanding steam is pumped out of the expansion tank (30) and supplied to the process steam.