CO₂ Booster System Pressure Control for Rapid Partial-Load Response
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Solution Overview
Problem
Existing booster systems face challenges in quickly reducing and controlling final discharge pressure to target pressure during partial load operations due to slower temperature changes in heat exchangers compared to pressure changes, leading to increased discharge pressure.
Innovation Solution
A booster system with a first compression unit, a cooling unit, and a second compression unit, where the opening degree of a flow regulating valve is regulated based on pressure sensor detections to control the flow rate of the cooling medium and suction flow rate, allowing for quicker adjustment of discharge pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flow rate of cooling medium is reduced to increase pump inlet temperature and reduce final discharge pressure, then the final discharge pressure control is improved, but the discharge pressure of compression unit and final discharge pressure increase more likely, making it difficult to quickly reduce the final discharge pressure
Solution Approach 1:
The invention applies preliminary action by introducing a heating unit that pre-heats the intermediate supercritical pressure liquid before it enters the pump unit. This preliminary heating action allows the system to rapidly increase the pump inlet temperature and reduce the final discharge pressure without having to wait for the slow thermal response of the cooling unit. The heating unit acts in advance to counteract the pressure increase, enabling quick pressure reduction while maintaining precise final discharge pressure control.
Solution Approach 2:
The heating unit serves as an intermediary element between the cooling unit and the pump unit. It mediates the temperature control by providing a rapid heating function that complements the slow cooling function. This intermediary heating capability allows the system to quickly adjust the pump inlet temperature in response to pressure changes, resolving the contradiction between precise pressure control and fast response speed.
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
Enables rapid control of final discharge pressure to target pressure during partial load operations by prioritizing pressure changes over temperature changes, preventing increases in discharge pressure and ensuring stable operation.
Implementation Method 1
a compression unit that compresses the object gas to intermediate pressure equal to and higher than critical pressure and lower than target pressure to generate an intermediate supercritical fluid
Implementation Method 2
a cooling unit that extracts a part of the intermediate supercritical fluid generated by the compression unit and supplied into the pump unit and uses the part of the intermediate supercritical fluid as a cooling medium, and cools the intermediate supercritical fluid generated by the compression unit to generate an intermediate supercritical pressure liquid
Implementation Method 3
a pump unit that increases pressure of the intermediate supercritical pressure liquid generated by the cooling unit to target pressure or higher
Data Source
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AI summary
A booster system 1 for increasing pressure of carbon dioxide F to pressure equal to or higher than target pressure that is higher than critical pressure, including: a compression unit 2 that compresses the carbon dioxide F to intermediate pressure equal to or higher than the critical pressure and lower than the target pressure to generate an intermediate supercritical fluid; a cooling unit 3 that extracts a part of the intermediate supercritical fluid generated by the compression unit 2 and uses the part of the intermediate supercritical fluid as a cooling medium, and cools the intermediate supercritical fluid generated by the compression unit 2 to generate an intermediate supercritical pressure liquid; a pump unit that increases pressure of the intermediate supercritical pressure liquid generated by the cooling unit 3 to a pressure equal to or higher than the target pressure; a flow regulating valve 92 that regulates a flow rate of the intermediate supercritical fluid generated by the compression unit 2 into the cooling unit 3; and a pressure sensor 81 that detects pressure of the intermediate supercritical pressure liquid on an inlet side of the pump unit 3, wherein an opening degree of the flow regulating valve 92 is regulated based on a detection result of the pressure sensor 81.