Raw material gas liquefying device and method of controlling this raw material gas liquefying device
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Solution Overview
Problem
The existing raw material gas liquefying devices face challenges in stabilizing the liquid level in the liquefied refrigerant storage tank and maintaining a good cycle balance due to changes in entrance temperature or pressure, leading to unstable liquefaction yields and disorder in the cycle balance.
Innovation Solution
A raw material gas liquefying device with a feed line and refrigerant circulation line, equipped with temperature and liquid level sensors, and a controller that adjusts the opening rate of the Joule-Thomson valves to control the refrigerant storage tank liquid level and temperature, ensuring it remains within predetermined ranges, thereby stabilizing the liquid level and maintaining a balanced cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the opening rate of the circulation system JT valve is adjusted to control refrigerant circulation, then the liquefaction yield changes, but the liquid level in the liquefied refrigerant storage tank becomes unstable and cycle balance is disrupted
Solution Approach 1:
The control device monitors the liquid level in the liquefied refrigerant storage tank in real-time and adjusts the opening rate of the circulation system JT valve based on feedback from the liquid level changes. This closed-loop control ensures that the liquid level remains stable while maintaining appropriate liquefaction yield by dynamically responding to system conditions.
2Productivity
If the entrance temperature or pressure of the circulation system JT valve changes, then the liquefaction yield changes, but the cycle balance becomes disordered
Solution Approach 1:
The control device monitors temperature and pressure at the entrance of the circulation system JT valve and adjusts the valve opening rate based on feedback from these parameter changes. This ensures that liquefaction yield is optimized while maintaining cycle balance by compensating for fluctuations in entrance conditions.
Solution Approach 2:
The system dynamically adjusts the opening rate parameter of the circulation system JT valve in response to changes in entrance temperature and pressure. By changing this control parameter based on actual operating conditions, the system maintains both high liquefaction yield and stable cycle balance.
3Manufacturing precision
If the opening rate of the feed system JT valve is adjusted to control raw material gas liquefaction, then the temperature control precision improves, but the refrigerant storage tank liquid level may fall outside allowable range
Solution Approach 1:
The control device simultaneously monitors both the temperature of the raw material gas and the liquid level in the refrigerant storage tank. It adjusts the opening rate of the feed system JT valve based on feedback from both parameters, ensuring that temperature control precision is maintained while the liquid level remains within the allowable range through coordinated 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
This solution stabilizes the production of liquefied raw material gas by maintaining a good cycle balance and stabilizing the liquid level in the liquefied refrigerant storage tank, ensuring efficient and consistent liquefaction.
Implementation Method 1
heat exchangers 81 to 86 which exchange heat between the raw material gas in the feed line 1 and the refrigerant in the refrigerant circulation line 3
Implementation Method 2
liquefied by Joule-Thomson (isenthalpic) expansion at the feed system JT valve 16
Implementation Method 3
the refrigerant is compressed by the compressors 32, 33
Implementation Method 4
the refrigerant flows through the expansion units 37, 38, and is changed into a low-temperature gas
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A raw material gas liquefying device includes a feed line in which a raw material gas flows through a heat exchanger, a liquefied refrigerant storage tank, and a feed system JT valve in this order; a refrigerant circulation line including a refrigerant liquefaction route and a cryogenic energy generation route, wherein in the refrigerant liquefaction route, a refrigerant flows through a compressor, the heat exchanger, a circulation system JT valve, the liquefied refrigerant storage tank, and the heat exchanger in this order, and returns to the compressor, while in the cryogenic energy generation route, the refrigerant flows through the compressor, the heat exchanger, an expansion unit, and the heat exchanger in this order, and returns to the compressor; and a controller. The controller determines whether or not a refrigerant storage tank liquid level is within a predetermined allowable range, manipulates an opening rate of the feed system JT valve to control a temperature of the refrigerant at the exit side of a high-temperature-side refrigerant flow path of the heat exchanger so that the temperature reaches a predetermined temperature set value in a case where the refrigerant storage tank liquid level is within the predetermined allowable range, and manipulates the opening rate of the feed system JT valve to control the refrigerant storage tank liquid level so that the refrigerant storage tank liquid level falls into the predetermined allowable range in a case where the refrigerant storage tank liquid level is outside the predetermined allowable range.