Circulating Dry Scrubber Hopper Gas Flow Path
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Solution Overview
Problem
Conventional circulating dry scrubber systems require recirculation of scrubbed flue gas to maintain the fluidized bed, which can adversely affect performance and create operational difficulties due to high particulate concentrations, especially during reduced load conditions.
Innovation Solution
A modular circulating dry scrubber system that directs the scrubbed gas stream around an internal hopper to recirculate excess particulates back to the reactor without the need for gas recirculation, using a housing with a filter array and internal hopper to collect and return particulates to the fluidized bed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If scrubbed flue gas is recirculated to maintain the fluidized bed, then the fluidized bed can be maintained, but system performance is adversely affected and operational difficulties arise due to high particulate concentrations
Solution Approach 1:
The patent extracts the harmful recirculated gas stream from the system by introducing it into the hopper where particulates are collected. This separates the fluidized bed maintenance function from the harmful recirculation path, allowing the bed to be maintained while preventing recirculated gas from adversely affecting system performance.
Solution Approach 2:
The hopper acts as an intermediary device that receives recirculated scrubbed flue gas and facilitates the collection and return of particulates to the fluidized bed. This intermediary structure enables maintenance of the fluidized bed without directly recirculating the harmful gas stream back to the reactor inlet.
2Stability of the object's composition
If gas recirculation ducts are used to maintain the fluidized bed, then the fluidized bed can be maintained, but device complexity increases
Solution Approach 1:
The patent merges the functions of gas recirculation and particulate collection into a single integrated hopper structure. The recirculated gas is introduced into the hopper where it simultaneously facilitates particulate collection and their subsequent return to the fluidized bed, eliminating the need for separate gas recirculation ducts.
Solution Approach 2:
The hopper serves multiple functions: it collects particulates from the scrubbed gas stream, facilitates their return to the fluidized bed, and can receive recirculated gas. This multi-functional design eliminates the need for dedicated gas recirculation ducts, reducing overall device complexity.
3Stability of the object's composition
If recirculated scrubbed flue gas is used to maintain the fluidized bed, then the fluidized bed can be maintained, but operational difficulties are created due to high particulate concentrations
Solution Approach 1:
The patent extracts the operational difficulties associated with high particulate concentrations by collecting particulates in the hopper and returning them to the fluidized bed separately from the recirculated gas stream. This separation eliminates the operational difficulties caused by high particulate concentrations in the recirculated gas.
Solution Approach 2:
The system uses the recirculated scrubbed flue gas itself to facilitate particulate collection in the hopper, which then automatically returns particulates to the fluidized bed. This self-service mechanism maintains the fluidized bed without requiring additional operational intervention to manage high particulate concentrations.
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 solution eliminates the need for gas recirculation ducts, reduces operational difficulties, and enhances system performance by maintaining the fluidized bed without recirculated gas, allowing for improved control during load fluctuations and reduced maintenance costs.
Implementation Method 1
contact between the flue gas and humid sorbent results in a high removal efficiency of pollutants from the flue gas
Implementation Method 2
Pollutants such as SO2, SO3, HCl and HF can be removed with hydrated lime to form compounds such as CaSO4, CaSO3, CaCl2, CaF2, etc.
Implementation Method 3
a filter array within the housing and adapted to remove the particulates from the scrubbed gas stream
Implementation Method 4
an internal hopper within the housing and adapted to receive the particulates from the scrubbed gas stream and return at least some of the particulates to the fluidized bed
Implementation Method 5
The scrubbed gas stream exits the circulating dry scrubber reactor and flows upward between an interior of the housing and an exterior of the internal hopper
Data Source
AI summary
A system and method suitable for the removal of pollutants from gases with a circulating dry scrubber system having a circulating dry scrubber reactor containing a fluidized bed adapted to contact the gas with a dry reagent within the fluidized bed. The system includes a housing fluidically coupled to the reactor, a filter array within the housing, and an internal hopper within the housing and adapted to return at least some of the particulates to the fluidized bed within the circulating dry scrubber reactor. The scrubbed gas stream exits the circulating dry scrubber reactor and flows upward between an interior of the housing and an exterior of the internal hopper before contacting the filter array. The exterior of the internal hopper is exposed to the scrubbed gas stream, and the scrubbed gas stream is not recirculated to the circulating dry scrubber reactor to maintain the fluidized bed therein.