Multi-Chamber MVC Compressor for Independent Stage Compression Control
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Solution Overview
Problem
Current Mechanical Vapor re-Compression (MVC) systems face challenges such as high entropy, difficulty in controlling and maintaining thermodynamic conditions, bulky and inefficient heat-exchangers, reduced vapor production, and increased energy consumption due to the use of a single compressor for multiple stages, which limits the number of stages that can be effectively served and increases costs.
Innovation Solution
The implementation of reciprocating positive displacement compressors with multiple independent dual-action chambers, allowing each stage to adjust its own flow rate and compression ratio independently, and featuring rotary-radial or linear motion configurations, enables more precise control and efficient operation of multi-stage heat-pump systems like desalination processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single centrifugal compressor is used for multi-stage MVC systems, then the system structure is simplified, but the entropy increases significantly and the number of stages that can be effectively served is limited
Solution Approach 1:
The patent divides the single compressor into multiple independent compression chambers (first, second, third chambers) that operate in parallel. Each chamber serves specific stages independently, reducing the compression ratio per chamber and thereby minimizing entropy generation. The first chamber serves first and second stages, the second chamber serves third and fourth stages, and the third chamber serves fifth and sixth stages.
2Device complexity
If a single compressor serves multiple stages, then device complexity is reduced, but control precision of thermodynamic conditions deteriorates
Solution Approach 1:
The compressor is segmented into multiple independent chambers with separate suction and discharge connections for different stages. This allows independent control of pressure and temperature conditions in each chamber, enabling precise thermodynamic control for each stage while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent employs variable speed drives for the compressors and adjustable throttling valves at the discharge of each compression chamber to dynamically adjust operating parameters. This enables real-time optimization of thermodynamic conditions for each stage according to varying process requirements.
3Device complexity
If a single compressor is used for the entire system, then the number of components is reduced, but the heat-exchanger surface area increases and efficiency decreases
Solution Approach 1:
The patent divides the vapor compression system into multiple independent chambers, each with its own optimized heat-exchanger surfaces. This segmentation allows each heat-exchanger to be sized appropriately for its specific load, reducing the total heat-exchanger surface area required compared to a single large heat-exchanger serving all stages.
4Device complexity
If a single compressor serves all stages, then device complexity is reduced, but the number of stages that can be effectively operated is limited
Solution Approach 1:
The patent segments the compression system into multiple chambers that can operate independently or in combination, enabling the system to effectively serve six stages across three compression chambers. This segmentation allows each chamber to handle a manageable number of stages, increasing the total number of stages that can be operated compared to a single compressor.
5Device complexity
If a single compressor is used, then device complexity is reduced, but energy consumption increases
Solution Approach 1:
The patent divides the compression system into multiple independent chambers, each optimized for specific stage ranges. This segmentation reduces the compression ratio in each chamber, improving compression efficiency and reducing energy consumption. Additionally, each chamber can be independently controlled to match actual process demands, avoiding energy waste from compressing vapor beyond what is needed.
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 production efficiency, reduces energy costs, and allows for more precise control of thermodynamic conditions, enabling a greater number of stages to be effectively operated while minimizing entropy and heat-exchanger surface area, leading to improved overall system efficiency and reduced unit volume.
Implementation Method 1
reciprocating positive displacement compressors with multiple independent dual-action chambers
Implementation Method 2
the vapor runs externally around the entire system and is fed to the heat-exchanger of the first and warmest stage, where it is condensed to desalinated water, transferring sensible and latent heat
Implementation Method 3
evaporation and condensers/heat-exchangers chambers with a brine spray system
Implementation Method 4
the vapor produced at the last and coldest stage is sucked and compressed by, the single mechanical compressor, becomes superheated, its temperature rises to the system's highest temperature
Data Source
AI summary
Multi-chamber Compressor (6, 206, 506) of Mechanical Vapor re-Compression (MVC) and water treatment methods, the compressor bearing independent compression chambers of positive displacement, for heat-pumps, of two main variants: a) reciprocating-rotary motion (6, 206) wherein the compression chambers (7V) are radially arranged cylindrical sectors based on concentric circular sectors of the same angle, with, pistons of radially arranged vanes (20, 220) of respective surface and with the plane of the vanes passing through the axis of the common rotor (14) and the shaft (16) and b) reciprocating-linear motion (506) wherein the compression chambers (52v) are in series arranged cylinders with pistons/vanes (50v) of corresponding circular surfaces and with the plane of the vanes perpendicular to the common shaft (51). In both cases, the shaft (16, 51) and the motor are common to all the vanes (20v, 50v), which follow identical strokes. The surfaces of the vanes (20v, 50v), as well as of the compression chambers (7V, 52v), differ from each other, since each compression chamber (7V, 52v) has its own and independent pair of evaporation (ev, dv, Lv, by) and heat-exchanger chambers/areas (Cv/eCv, 32v/33v, 132v, 54v/53v), said compression chamber exclusively sucks from, compresses and discharges to, and the fluids/vapors being dispensed, are under different thermodynamic state conditions. The stages are independent from each other, the medium-vapor providing the energy of evaporation is produced in the stage itself, and flow rate and compression ratio CR are independently controlled and adjusted in each stage.