Compressor Bypass Valve Control for Cooling Pressure Loss
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Solution Overview
Problem
Existing gas compressors experience increased pressure loss and power consumption when compressed gas passes through both the waste heat recovery and cooling heat exchangers, leading to potential component failure due to elevated temperatures.
Innovation Solution
A gas compressor with a bypass path and control system that adjusts the flow of compressed gas based on motor current and temperature sensors to bypass the cooling heat exchanger when necessary, reducing pressure loss and maintaining optimal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the compressed gas passes through both the waste heat recovery heat exchanger and the cooling heat exchanger, then the compressed gas is cooled effectively, but the pressure loss of the compressed gas increases
Solution Approach 1:
The system dynamically switches between two cooling paths based on operating conditions. The control device opens or closes the first and second valves to route the compressed gas either through both heat exchangers (when cooling is needed) or bypass the cooling heat exchanger (when pressure loss should be minimized), making the cooling system adaptable to different operational states
Solution Approach 2:
The control device monitors parameters such as motor current, temperature of compressed gas, and ambient temperature to determine when to switch between cooling modes. By changing operational parameters (valve states) based on monitored conditions, the system optimizes the balance between cooling effectiveness and pressure loss
2Temperature
If the pressure loss increases, then the cooling effect is maintained, but the power required by the compressor body increases
Solution Approach 1:
The system dynamically adjusts the cooling path based on motor current and temperature conditions. When the motor current is high and cooling is needed, the gas passes through both heat exchangers. When the motor current is low or cooling is sufficient, the system bypasses the cooling heat exchanger to reduce pressure loss and power consumption
Solution Approach 2:
The control device uses feedback from the ammeter (motor current), temperature sensor (compressed gas temperature), and ambient temperature sensor to continuously monitor system state and adjust valve positions accordingly, optimizing the balance between cooling effect and power consumption
3Stress or pressure
If the compressor body increases the pressure to compensate for pressure loss, then the pressure requirement is met, but the temperature of the compressed gas rises
Solution Approach 1:
The system dynamically switches between two operational modes: when cooling is required, the gas passes through both heat exchangers to maintain low temperature while meeting pressure requirements; when cooling is sufficient or power consumption is high, the system bypasses the cooling heat exchanger to reduce pressure loss and prevent excessive temperature rise
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
Reduces pressure loss and power consumption, preventing component failure by optimizing the gas flow path based on real-time monitoring, thus ensuring safe and efficient operation.
Implementation Method 1
The waste heat recovery heat exchanger recovers compression heat from the compressed gas by exchanging heat between the compressed gas and circulating water, thereby heating the circulating water
Implementation Method 2
recovers compression heat from the compressed gas
Implementation Method 3
a cooling heat exchanger that cools the compressed gas after waste heat has been recovered by the waste heat recovery heat exchanger
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A technique capable of reducing pressure loss caused by cooling of compressed gas is provided. A gas compressor 100 includes: a bypass path 11 that bypasses an aftercooler 10; a bypass valve 13 provided in the bypass path 11; a cooler bypass valve 12 provided between a connection portion 19b and the aftercooler 10; an ammeter 16 that detects a current value of a motor 1; a temperature sensor 14 that detects a temperature of compressed gas after waste heat has been recovered by a high-pressure stage waste heat recovery heat exchanger 9; a temperature sensor 22 that detects an ambient temperature around the gas compressor 100; and a control device 17 that opens and closes the bypass valve 13 and the cooler bypass valve 12 based on the current value detected by the ammeter 16, the temperature detected by the temperature sensor 14, and the temperature detected by the temperature sensor 22.