Circulating Fluidized Bed Boiler Layout for Compact Exhaust Routing
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Solution Overview
Problem
Existing circulating fluidized bed boilers have a cumbersome and long arrangement of components due to their in-line layout, which occupies excessive space and complicates the design.
Innovation Solution
The boiler design incorporates a vertically extending furnace, a separator unit, and a cross over duct with a unique exhaust gas channel configuration, including a first and second vertically extending pass and a horizontally extending pass, arranged in succession, minimizing the boiler's footprint and optimizing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an in-line layout of boiler components is used, then the exhaust gas flow path is simplified, but the boiler occupies excessive floor space and becomes cumbersome
Solution Approach 1:
The patent transitions from a horizontal in-line arrangement to a vertical three-dimensional configuration. The exhaust gas channel includes a first vertically extending pass, a horizontally extending pass, and a second vertically extending pass, utilizing vertical space to reduce floor footprint while maintaining flow path efficiency
Solution Approach 2:
The horizontally extending pass is positioned below the separator unit, with the separator unit arranged between the two vertically extending passes. This nested arrangement allows components to be stacked vertically, minimizing the horizontal footprint of the boiler system
2Productivity
If components are arranged laterally one after the other in the course of exhaust gas flow, then the gas flow path is direct, but the boiler becomes cumbersome and requires more space
Solution Approach 1:
The patent reorganizes components from a lateral sequence to a vertical arrangement. The exhaust gas channel alternates between vertical and horizontal directions, allowing multiple passes through the system in a compact vertical footprint, thereby reducing the horizontal spread of the boiler
Solution Approach 2:
The exhaust gas channel is divided into distinct segments: a first vertically extending pass, a horizontally extending pass, and a second vertically extending pass. This segmentation allows each component to be positioned optimally in three-dimensional space while maintaining efficient gas flow through the system
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 required floor space and enhances the compactness of the boiler, allowing for efficient steam generation and simplified maintenance, while minimizing the need for additional support structures and reducing the length of steam piping.
Implementation Method 1
fluidized bed boilers, and, particularly, circulating fluidized bed boilers are known to be advantageous for combustion of great variety of solid fuels
Implementation Method 2
circulating fluidized bed reactor having a vertical combustion chamber
Implementation Method 3
a vertical cyclone separator, the gas inlet channel of which is connected to the upper part of the combustion chamber
Implementation Method 4
a convection part that at least partly are formed by tube walls
Data Source
AI summary
A circulating fluidized bed boiler includes a vertically extending furnace, a separator unit, and an exhaust gas channel connected to the separator unit via a cross over duct. The exhaust gas channel includes a first vertically extending pass, a horizontally extending pass, and a second vertically extending pass. The first vertically extending pass, the horizontally extending pass, and the second vertically extending pass are arranged successively in the gas flow direction such that the horizontally extending pass is configured to connect the first vertically extending pass and the second vertically extending pass with each other. The horizontally extending pass is arranged below the separator unit, which is arranged between the first vertically extending pass and the second vertically extending pass.