Shell-and-Tube Heat Exchanger with Dynamic Flow Baffles
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Solution Overview
Problem
Existing process heat recovery systems with shell-and-tube heat exchangers have complex piping and valve configurations due to separate circuits for boiler and preheater operations, leading to increased engineering, manufacturing, and operational complexity.
Innovation Solution
A process heat recovery system with a shell-and-tube heat exchanger featuring shell-side baffles that direct water flow differently based on boiler or preheating operations, using a single set of downcomer and riser piping for both functions, eliminating the need for distinct piping circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate piping circuits are used for boiler and preheater operations, then functional reliability is improved, but device complexity increases
Solution Approach 1:
The heat exchanger shell is designed to perform multiple functions: it can operate as a boiler when boiler water is circulated through it, and as a preheater when feedwater is circulated through it. This multi-functionality is achieved through a single shell structure that can handle different fluid circuits, eliminating the need for separate heat exchanger shells for each function and thereby reducing device complexity while maintaining functional reliability
Solution Approach 2:
The system employs dynamic switching of fluid circuits through intercepting valves that can redirect flow paths. The shell can dynamically switch between receiving boiler water from the downcomer circuit or feedwater from the preheater circuit, allowing the same shell to adapt to different operational modes (boiler or preheater) without requiring separate fixed infrastructure for each function
2Reliability
If distinct piping circuits are implemented for boiler and preheater, then operational reliability is improved, but ease of operation deteriorates
Solution Approach 1:
Intercepting valves are introduced as intermediary control elements that simplify operation by providing a single control point for switching between operational modes. Instead of managing multiple separate circuits, the operator can switch between boiler and preheater modes by operating the intercepting valve, which automatically redirects the fluid flow to the appropriate circuit, thereby improving ease of operation while maintaining operational reliability
3Device complexity
If a single heat exchanger shell is used for both boiler and preheater functions, then device complexity is reduced, but adaptability must be maintained
Solution Approach 1:
The system achieves adaptability through dynamic flow control using intercepting valves that can redirect water circulation between different paths. The single heat exchanger shell can adapt to different functional requirements (boiler or preheater) by changing the flow configuration, maintaining versatility while reducing device complexity
Solution Approach 2:
The water circulation system is segmented into distinct controllable circuits: a downcomer circuit for boiler operation and a preheater circuit for preheating operation. The intercepting valve provides segmentation control, allowing independent management of each circuit while using a single shell, thereby maintaining functional adaptability with simplified piping configuration
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
Simplifies the piping and valve configuration, reducing complexity and enhancing practicality from both engineering and operational standpoints while maintaining efficient heat recovery capabilities.
Implementation Method 1
a shell-and-tube heat exchanger, which cools a hot process fluid flowing on tube-side by means of either shell-side water vaporization or shell-side boiler feedwater preheating
Implementation Method 2
shell-side water vaporization
Implementation Method 3
a steam drum for water-steam separation
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A process heat recovery system (1) wherein a heat exchanger (2) of shell- and-tube type works either as a boiler or as a boiler feedwater preheater, with boiler water or boiler feedwater circulating on shell-side, so as to cool a hot process fluid circulating on tube-side. The heat exchanger (2) is connected to a steam drum (3) by downcomer piping (12) and riser piping (14) for water circulation between the heat exchanger (2) and the steam drum (3). The heat exchanger (2) receives either the boiler water from the steam drum (3) by the downcomer piping (12), when the heat exchanger (2) works as a boiler, or the boiler feedwater by a boiler feedwater piping (27), when the heat exchanger (2) works as a boiler feedwater preheater. The heat exchanger (2) delivers by the riser piping (14) to the steam drum (3) either boiler water, when the heat exchanger (2) works as a boiler, or preheated boiler feedwater, when the heat exchanger (2) works as a boiler feedwater preheater. The heat exchanger (2) is provided with shell-side plates or baffles (29) for imparting prevailing flow directions to circulating water so that, when the heat exchanger (2) works as a boiler, the shell-side water flow, crosswise the tubes, has a prevailing vertical direction, whereas, when the heat exchanger (2) works as a boiler feedwater preheater, the shell-side water flow, crosswise the tubes, has a prevailing horizontal direction.