Thermodynamic system for bog compressor
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Solution Overview
Problem
The high manufacturing costs and design challenges of BOG compressors due to the use of low-temperature materials and significant temperature fluctuations during the compression of ultra-low-temperature BOG are not adequately addressed by existing technologies.
Innovation Solution
A thermodynamic system for a BOG compressor comprising an inlet preheater, first-stage and second-stage compressors, interstage and end coolers, with a heat exchange network that utilizes high-temperature exhaust gas to preheat low-temperature BOG and reduces the temperature range, thereby simplifying material selection and structure design, and minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-temperature materials are used to match the compressor for ultra-low temperature working environments, then the compressor can operate at ultra-low temperatures, but the manufacturing cost increases significantly
Solution Approach 1:
The patent applies preliminary action by preheating the ultra-low temperature BOG gas before it enters the compressor using a preheater. This preheating process raises the gas temperature to a range that standard materials can withstand, eliminating the need for expensive low-temperature materials in the compressor while maintaining the ability to handle ultra-low temperature BOG.
Solution Approach 2:
The preheater acts as an intermediary device between the ultra-low temperature BOG source and the compressor. It mediates the temperature mismatch by heating the gas to an intermediate temperature level that is compatible with standard compressor materials, thus resolving the contradiction without requiring the compressor itself to be made of special low-temperature materials.
2Productivity
If the compressor is designed to handle large temperature fluctuations during compression, then it can process BOG effectively, but the design and manufacture become significantly more difficult
Solution Approach 1:
The preheater performs preliminary heating of the BOG gas before compression, reducing the temperature swing that the compressor must endure. This preliminary action simplifies the compressor design by ensuring the gas enters at a more stable temperature, reducing thermal stress on components.
Solution Approach 2:
The system changes the temperature parameter of the BOG gas through preheating and intercooling processes. By adjusting the temperature parameters at different stages (preheating before compression, intercooling between stages, aftercooling after compression), the compressor operates within a narrower and more manageable temperature range, simplifying its design and manufacture.
3Ease of manufacture
If the temperature range during compression is reduced through preheating and cooling, then material selection and structure design are simplified, but the system complexity increases due to additional components
Solution Approach 1:
The patent merges multiple cooling functions into a single intercooler unit that performs both interstage cooling and aftercooling. This consolidation reduces the number of separate components while still achieving the necessary temperature reduction to simplify compressor design and material selection.
Solution Approach 2:
The intercooler is designed to serve multiple functions: it cools the gas between compression stages and also provides aftercooling. This multi-functionality reduces the overall system complexity by eliminating the need for separate cooling devices, while still achieving the temperature control benefits that simplify compressor manufacturing.
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 reduces manufacturing costs, simplifies the compressor structure, and enhances operational stability by adapting to large temperature fluctuations, while minimizing the use of low-temperature materials and reducing energy consumption.
Implementation Method 1
an inlet preheater, a first-stage compressor, an interstage cooler, a second-stage compressor, and an end cooler arranged in sequence; the preheater comprises a first inlet and a first outlet connected to each other, and a second inlet and a second outlet connected to each other
Implementation Method 2
a first-stage compressor, an interstage cooler, a second-stage compressor arranged in sequence
Implementation Method 3
an interstage cooler, a second-stage compressor, and an end cooler arranged in sequence
Data Source
Figure 1~2
AI summary
A thermodynamic system for a BOG compressor. A gas outlet end of a second-stage compressor (5) or a first-stage compressor (3) is communicated with a second gas inlet (23) of a preheater (2). A second gas outlet (24) of the preheater (2) is communicated with a gas inlet of an end cooler (6) or an interstage cooler (4). High-temperature exhaust gas at the gas outlet end of the second-stage compressor (5) or the first-stage compressor (3) serves as a heat source to preheat low-temperature BOG at a first gas inlet (21) of the preheater (2), such that the temperature of BOG entering the gas inlet end of the first-stage compressor (3) reaches a room temperature range.