Axial Piston Control for Full-Range Process Gas Temperature
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Solution Overview
Problem
Existing heat exchanger temperature control devices have limited control ranges, leading to inefficient operation, leakage flows, and potential unsafe temperature fluctuations due to malfunction, necessitating larger designs and compromised heat transfer efficiency.
Innovation Solution
A control device with an inner housing and movable piston that allows for complete control over the flow of hot and cooled gases, enabling full range temperature adjustment and minimizing leakage through precise cross-sectional area manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flap-based temperature control devices are used in the bypass tube, then the device complexity is reduced and ease of manufacture is improved, but the control range is limited and leakage flows occur
Solution Approach 1:
The invention extracts the control element (piston) from the traditional flap mechanism and places it inside the bypass tube. This allows the control device to achieve complete closure of the bypass tube, eliminating leakage flows while maintaining ease of manufacture through a relatively simple piston-cylinder arrangement.
Solution Approach 2:
Instead of using flaps that partially obstruct flow, the invention uses a piston that can completely close the bypass tube. This inverted approach (from partial obstruction to complete closure) enables full control range from 0% to 100% bypass flow, resolving the limitation of flap-based systems.
2Reliability
If the main cooling surface is designed larger to compensate for bypass flow, then the reliability of temperature control is improved, but the device complexity and space requirements increase
Solution Approach 1:
The invention introduces a dynamically adjustable bypass flow control mechanism that can adapt the bypass flow rate according to operating conditions. This dynamic control allows the main cooling surface to be optimized for its intended function without needing excessive area to compensate for uncontrolled bypass leaks, thereby improving temperature control reliability while reducing overall heat exchanger size.
3Adaptability or versatility
If complete closure of the bypass tube is achieved, then the control range is improved and leakage is eliminated, but the device complexity increases
Solution Approach 1:
The invention replaces complex flap mechanisms with a simpler piston-cylinder arrangement. The piston, controlled by an actuator, provides complete closure of the bypass tube through a straightforward linear motion mechanism, reducing device complexity while achieving full control range.
4Productivity
If the bypass tube is completely opened to interrupt flow from main cooling surface, then the productivity at low utilization is improved, but the temperature control precision deteriorates
Solution Approach 1:
The dynamically adjustable bypass flow control mechanism enables precise regulation of bypass flow rates across the entire operating range. This allows the system to maintain accurate temperature control even when the bypass is fully open, while also enabling optimal adaptation to low utilization conditions, thereby improving both productivity and temperature control precision simultaneously.
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 full control over process gas temperature from fully cooled to fully uncooled states, reduces leakage, and ensures safe operation by preventing excessive temperatures, enhancing heat exchanger efficiency and reliability.
Implementation Method 1
the second housing inlet opening and the second piston inlet opening are arranged in such a way relative to one another that a free-flow cross-sectional area of the second piston inlet opening can be changed by the movement of the piston in the axial direction, thereby making it possible to control a quantity of cooled process gas which can flow into the piston interior
Implementation Method 2
In the piston interior, mixing of the hot process gas and the cooled process gas takes place. By means of this mixing, the temperature-controlled process gas can be obtained.
Implementation Method 3
In the heat exchanger tubes, the hot process gas is cooled by cooling medium conducted in a shell chamber of the heat exchanger.
Data Source
AI summary
The invention relates to a device for controlling the temperature of a process gas and a heat exchanger having such a control device. The control device has an outer housing with an inflow and outflow chamber. Cooled process gas can flow into the inflow chamber, while temperature-controlled process gas can flow out of the control device via the outflow chamber. An inner housing, which is fluidically connected to a hot gas line, extends from the inflow chamber through an element that mechanically separates the chambers into the outflow chamber. An axially movable piston, through which flow can take place, is arranged within the inner housing. The inner housing and the piston have openings which allow fluidic connections to the hot gas line, the inflow chamber and the outflow chamber.