Parallel Settling Vessels for Fluidized Bed Discharge
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Solution Overview
Problem
Existing discharge systems for fluidized bed pressure vessels result in excessive gas loss during the removal of solids, leading to wastage of raw materials and increased energy consumption, with limitations in discharge capacity, maintenance downtime, and efficiency.
Innovation Solution
A discharge system comprising multiple settling vessels arranged in parallel, connected through discharge, vent, and crosstie lines with controlled valves, eliminating the need for a transfer tank and filter elements, allowing for efficient gas retention and independent operation of each vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If existing discharge systems are used to remove solids from fluidized bed pressure vessels, then solids can be discharged from the vessel, but excessive gas loss occurs during the discharge process
Solution Approach 1:
The discharge system is segmented into multiple settling vessels operating in parallel, each capable of independent operation. This segmentation allows the system to maintain high discharge capacity while minimizing gas loss, as each vessel can be optimized for gas retention and the system can switch between vessels to maintain continuous operation.
Solution Approach 2:
Settling vessels serve as intermediary components between the fluidized bed pressure vessel and downstream equipment. These intermediaries allow for pressure equalization and gas retention, enabling solids to be discharged while minimizing gas loss through controlled pressure management and gas recycling.
2Loss of substance
If multiple settling vessels arranged in parallel are used, then gas loss is minimized and discharge capacity is enhanced, but system complexity increases
Solution Approach 1:
Each settling vessel is designed to perform multiple functions: gas retention, pressure equalization, and solids settling. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in system complexity despite the parallel configuration.
Solution Approach 2:
The system merges gas retention, pressure equalization, and solids discharge functions into a unified parallel vessel configuration. By combining these functions within each settling vessel and coordinating their operation, the system achieves high efficiency without proportionally increasing complexity.
3Loss of substance
If settling vessels operate in series with transfer tanks, then gas loss is reduced, but maintenance downtime increases and efficiency decreases
Solution Approach 1:
The system segments the settling function across multiple parallel vessels, allowing one vessel to undergo maintenance while others continue operation. This segmentation eliminates the downtime penalty associated with series configurations, where maintenance of one component stops the entire process.
Solution Approach 2:
The system changes the operational parameter from sequential (series) to parallel operation, enabling continuous gas retention while allowing individual vessels to be taken offline for maintenance without affecting overall system performance or gas loss reduction.
4Productivity
If conventional dilute phase conveying systems are used, then solids can be transferred downstream, but significant gas and energy are lost
Solution Approach 1:
Settling vessels act as intermediaries that separate solids from gas before downstream transfer. This intermediary function allows solids to be conveyed with minimal gas, reducing the energy required for dilute phase conveying while maintaining effective solids transfer capability.
Solution Approach 2:
The system extracts gas from the solid-gas mixture in the settling vessels before downstream conveyance. By removing excess gas prior to transfer, the system reduces energy consumption in the conveying system while maintaining full solids transfer capability.
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 minimizes gas loss, enhances discharge capacity, reduces maintenance downtime, and improves processing efficiency by ensuring that each vessel can operate independently, thereby reducing raw material wastage and energy consumption.
Implementation Method 1
pressure equalization between each
Implementation Method 2
solids settle out to essentially fill settling vessel 4
Data Source
AI summary
A discharge system for removing a solid/gas mixture from a fluidized bed pressure vessel is provided. The system includes a fluidized bed pressure vessel, settling vessels, discharge lines, primary discharge valves, vent lines, primary vent valves, crosstie lines, crosstie valves, and primary exit valves wherein the system is absent a transfer tank, and absent a filter element. The method provides for transferring a solid/gas mixture via a discharge line from the pressure vessel to a settling vessel, wherein gas is separated from the mixture, and the gas is transferred to at least one other settling vessel via a crosstie line. After the solids are transferred out of the settling vessel, the empty vessel then receives gas from other settling vessels in the system.