Evaporation System Vapor Compression Dew Point Control
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Solution Overview
Problem
Conventional multistage evaporation systems have limited efficiency due to reduced condensation capacity and number of evaporator stages when using low-pressure process waste steam, and struggle to evaporate products with high boiling points to sufficient concentrations.
Innovation Solution
A vapor compression stage is connected to the product vapor exit of the evaporator, lowering the dew point and increasing the temperature of the product vapor to enhance its heating capacity for subsequent evaporator stages, utilizing mechanical vapor compression to optimize energy use from process waste steam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If process waste steam at low pressure is used to heat the evaporator, then energy utilization is improved, but the condensation capacity of the evaporator is reduced
Solution Approach 1:
The invention changes the operating parameters of the evaporator by adjusting the dew point to a value below the heating temperature in the downstream evaporator. This parameter change enables the evaporator to operate effectively with low-pressure process waste steam while maintaining high condensation capacity through the vapor compression stage that raises product vapor temperature.
2Productivity
If the number of evaporator stages is increased to improve evaporation efficiency, then productivity is improved, but the system complexity increases
Solution Approach 1:
The invention combines the vapor compression function with the evaporator system by connecting the vapor compression stage to the product vapor exit of the evaporator. This merging allows the compressed product vapor to heat downstream evaporator stages, effectively increasing evaporation efficiency without proportionally increasing system complexity.
3Temperature
If mechanical compressors with pressure ratio up to 2.5 are used to compress product vapor, then vapor temperature is increased, but the number of evaporator stages that can be heated is still greatly limited
Solution Approach 1:
The invention performs preliminary action by lowering the dew point of the first evaporator below the heating temperature in the downstream second evaporator before the compression process. This preliminary adjustment of the dew point, combined with vapor compression, enables the product vapor to reach a temperature sufficient for heating multiple downstream evaporator stages.
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 approach significantly increases the condensation power of the first evaporator and allows for more effective evaporation of high-boiling-point products by reusing the product vapor for heating subsequent stages, improving overall evaporation system efficiency.
Implementation Method 1
a vapor compression stage is connected to the product vapor exit of the evaporator, which compression stage lowers the dew point of the evaporator below the temperature value required for heating the process stage and, by compression of the product vapor, raises the temperature of the product vapor to the temperature value required for heating the process stage
Implementation Method 2
The condensation capacity of the evaporators heated with such process waste steams is as a rule reduced
Implementation Method 3
an evaporation system comprising an evaporator heated by process waste steam and a process stage heated by product vapors of the evaporator
Data Source
AI summary
A multistage evaporation system is proposed in which the first evaporator is heated via a jet wet washer with superheated, air-containing waste steam, for example of a drier. The product vapor of the first evaporator stage is fed via a mechanical compressor to a second evaporator stage for heating. The compressor ensures firstly a lowering of the dew point in the evaporator space of the first evaporator stage and secondly a temperature increase of the product vapor fed to the second evaporator stage for heating.