Thermal Sleeve Structure for Hot-Wall Reactor Piping Reliability
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Solution Overview
Problem
Dehydrogenation reactors face issues with high temperatures, thermal cycling, and shock flow leading to piping and connector failures, which reduce reactor output and require inefficient heat management.
Innovation Solution
A sleeve is designed to insulate reactor components by allowing convective heat transfer behind the sleeve, reducing thermal cycling exposure and using a lip portion to couple the flange and reactor, thereby decreasing heat transfer to the flange, pipe, and connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a hot-wall design is used to maintain pipe wall temperature, then the reactor can operate at high temperatures for endothermic reactions, but the piping and connectors are subjected to large cyclic thermal stress that can create cracks and lead to failures
Solution Approach 1:
The system is divided into a hot-wall reactor section and a separately insulated piping section. The sleeve creates a thermal boundary that segments the thermal environment, allowing the reactor to operate at high temperature while the piping operates at a lower, more stable temperature.
Solution Approach 2:
The sleeve acts as an intermediary thermal barrier between the hot reactor and the piping system. It allows thermal energy to be maintained in the reactor while preventing excessive heat transfer to the piping and connectors, thereby reducing thermal stress cycles.
2Loss of energy
If conventional insulation is used on piping, then heat transfer to the pipe is reduced, but the piping still experiences thermal cycling and shock flow that can damage connectors and welds
Solution Approach 1:
The sleeve serves as a protective intermediary that not only reduces heat transfer but also isolates the piping and connectors from thermal oscillations and shock flows generated by the critical flow orifice, thereby protecting welds and connectors from thermal and mechanical damage.
3Reliability
If the inlet piping is designed to withstand high temperatures and shock flow, then the system can operate safely, but the complexity and cost of the piping system increases
Solution Approach 1:
Instead of designing the entire piping system to withstand high temperatures and shock flows, the sleeve applies localized thermal and mechanical protection only where needed - at the reactor inlet where thermal oscillations and shock flows are most severe. This reduces overall system complexity while maintaining safety.
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
The sleeve enhances safety, extends hot-wall pipe run length, and reduces maintenance by insulating against thermal oscillations, improving reactor operability and longevity.
Implementation Method 1
the sleeve is configured to be positioned in an inlet pipe of the reactor to allow convective heat transfer behind the sleeve
Implementation Method 2
the sleeve may enable longer run length for the hot-wall pipe, enhance safety and operability, and reduce maintenance work during turnarounds or from pipe failure
Data Source
AI summary
Systems, devices, and methods for transferring heat associated with an interface corresponding to a reactor. In some aspects, a system includes a sleeve having a body portion that defines a channel that extends from a first end to a second end of the body portion. The channel is configured to define a flow path that extends through a flange that is coupled to a pipe via a welding point a lip portion extending radially away from the first end and configured to be positioned between the flange and a reactor.