Oil-Injection Temperature Control for Gas Compression Stability
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Solution Overview
Problem
Existing methods for controlling reference temperatures in gas compression devices using thermostat control valves and variable-speed fans are inefficient and prone to interference, leading to energy wastage, condensate formation, and mechanical damage due to oscillatory behavior.
Innovation Solution
A method using a non-fuzzy logic algorithm to control the apportioning proportion and fan speed in an oil-injected gas compression device, employing a PID controller or ON/OFF controller to minimize interference and stabilize temperature control, with adjustments based on current values and desired temperature limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermostat control valve with fixed temperature setpoint and fixed-speed fan is used, then the reference temperature can be controlled to a desired value, but the fan causes energy wastage and oscillatory behavior leading to mechanical damage
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed-speed fan to a variable-speed fan that dynamically adjusts its rotation speed based on real-time temperature feedback. The control unit continuously monitors the reference temperature and modulates the fan speed accordingly, enabling the system to adapt to changing thermal conditions and reduce energy consumption during partial cooling requirements.
Solution Approach 2:
The patent implements feedback control through a closed-loop system where the control unit receives temperature signals from sensors, compares them with the desired setpoint, and adjusts the fan speed response accordingly. This feedback mechanism eliminates the oscillatory behavior of fixed-speed systems by providing continuous correction, thereby reducing energy wastage while maintaining stable temperature control.
2Loss of energy
If a thermostat control valve with fixed temperature setpoint and variable-speed fan is used, then energy efficiency improves, but interference between control circuits causes oscillatory behavior and mechanical damage
Solution Approach 1:
The patent applies segmentation by dividing the control system into functionally independent modules: a thermostat control valve for temperature regulation and a separately controlled variable-speed fan for cooling. Each component has its own control logic, preventing interference between circuits. The control unit coordinates both components through independent control channels, eliminating oscillatory behavior while maintaining energy efficiency.
Solution Approach 2:
The patent uses dynamics by implementing a variable-speed fan that smoothly adjusts its rotation speed based on temperature requirements, avoiding abrupt on/off cycling. This dynamic adjustment, combined with independent control circuits, prevents mechanical shock and reduces wear on components, thereby improving system reliability while maintaining energy efficiency.
3Temperature
If the fan operates at fixed speed to control reference temperature, then temperature control is achieved, but rapid temperature decrease below minimum level causes condensate formation
Solution Approach 1:
The patent applies dynamics by using a variable-speed fan that can modulate its rotation speed to precisely control the cooling rate. The control unit monitors the reference temperature in real-time and adjusts the fan speed to prevent excessive temperature decrease, thereby avoiding condensate formation while maintaining effective temperature control above the minimum level.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the reference temperature and adjusting the fan speed response based on the temperature deviation from the setpoint. This feedback mechanism prevents the temperature from dropping below the minimum level by providing corrective control, thereby eliminating the risk of condensate formation while maintaining stable temperature control.
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
Stabilizes temperature control, reduces energy consumption, and prevents condensate formation by minimizing interference between control circuits, ensuring safe and efficient operation of the gas compression device.
Implementation Method 1
an oil cooler cooled by a fan, for cooling the first part
Data Source
AI summary
A method for controlling a first reference temperature in a device (1) for compressing gas, the device (1) including an oil-injected element (2) for compressing the gas; an oil injection pipe network (6) for injecting oil into the oil-injected element (2), including: an apportioning means (8) for apportioning the oil into a first part and into a second part; an oil cooler (10) cooled by a fan (9), for cooling the first part; and a bypass (11) for diverting the second part past the oil cooler (10). An apportioning proportion of the first part is controlled to a required apportioning proportion, and subsequently a speed of the fan (9) is controlled to a required speed optionally on the basis of the apportioning proportion, wherein the apportioning proportion is controlled by a control unit (15) on the basis of a non-fuzzy logic algorithm.