Evaporator Liquid Drain Piping for Vertical Vessel Level Control
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Solution Overview
Problem
Conventional evaporator systems for industrial boilers face issues with increased water level in the vertical vessel due to friction pressure loss, leading to water carryover with dried steam, which reduces drying capacity.
Innovation Solution
The evaporator system employs a liquid drain piping to return separated liquid from the vertical vessel to the evaporator heat transfer section, allowing the liquid level in the vertical vessel to be below the horizontal vessel, thereby reducing friction pressure loss and preventing water carryover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid is transported back to the horizontal vessel, then the liquid level in the vertical vessel can be maintained above the horizontal vessel water level, but friction pressure loss increases causing water carryover
Solution Approach 1:
The invention extracts the liquid transport function from the traditional return path to horizontal vessel and redirects it to the heat transfer section inlet. This separates the liquid drainage function from the steam separation function, allowing the vertical vessel liquid level to drop below the horizontal vessel level without causing water carryover, thereby eliminating the friction pressure loss problem while maintaining steam purity.
2Quantity of substance
If the liquid level in the vertical vessel is kept high, then sufficient liquid is available for separation, but water carryover increases reducing drying capacity
Solution Approach 1:
The invention introduces liquid drain piping as an intermediary pathway that directly connects the vertical vessel bottom to the heat transfer section inlet. This intermediary system allows liquid to be efficiently removed from the vertical vessel without passing through the steam separation zone, enabling the liquid level to be maintained at an optimal height for separation while preventing water carryover into the steam system.
3Device complexity
If a common liquid drain pipe is used for multiple vertical separator vessels, then system complexity is reduced, but pipe diameter must be large enough to maintain negligible friction pressure loss
Solution Approach 1:
The invention merges the liquid drainage function of multiple vertical separator vessels into a single common liquid drain pipe that connects to the heat transfer section inlet. By combining the drainage paths and utilizing the large diameter of the heat transfer section inlet connection, the system achieves efficient liquid removal from multiple vessels through one pipe without incurring significant friction pressure losses, thus reducing device complexity while maintaining performance.
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 configuration reduces the risk of water carryover and maintains steam purity by ensuring the liquid level in the vertical vessel drops, enhancing the drying capacity of the vertical vessel.
Implementation Method 1
use is made of the driving force exerted by the circulating evaporative heat transfer section
Implementation Method 2
the liquid level in the vertical vessel needs not be above the water level in a horizontal vessel to create the necessary pressure to force the separated liquid to flow back
Implementation Method 3
Water from the drum is transported to the evaporator heat transfer section where it is partly evaporated
Implementation Method 4
evaporator heat transfer section
Implementation Method 5
a vertical vessel is designed for drying this wet-steam
Data Source
AI summary
An evaporator system for an industrial boiler, containing a heat transfer system, a separator for separating water and steam and a dryer for drying the separated wet steam. A horizontal vessel contains a required minimum amount of water, a relatively small steam volume and internals for the separation of water and wet-steam. A vertical vessel contains internals for drying the wet steam to predetermined values by separating liquid from the wet-steam. The horizontal vessel and the vertical vessel are connected to each other by wet-steam piping through which separated wet-steam is transported from the horizontal vessel to the vertical vessel. The vertical vessel has a connection to dry-steam piping for discharging dried steam. The vertical vessel has a connection to a liquid drain piping for transporting liquid from the vertical vessel back to the inlet conduits of the evaporator heat transfer section.