Circulating Fluidized-Bed Reformer for Stable Hydrocarbon Processing
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Solution Overview
Problem
Existing reforming technologies face challenges in balancing the supply of raw materials with the heat required for reformation, leading to inefficient and costly processes, particularly in using expensive fuel gases and complex structural designs.
Innovation Solution
A circulating fluidized-bed reformer system that includes a fluidized-bed reforming furnace, a combustion furnace, and a separator, with a raw material feeder, fuel feeder, and controllers to regulate the heating fuel and air flow, allowing for precise balancing of raw material and heat supply using inexpensive heating fuels like waste or sludge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional reforming furnace with multiple reaction pipes and burners is used for uniform heating, then uniform heating is achieved, but the structure becomes much more complex and running cost increases due to expensive fuel gas consumption
Solution Approach 1:
The reforming process is segmented into two separate fluidized-bed chambers: a gasification chamber for raw material decomposition and a combustion chamber for heating circulating particles. This segmentation allows independent optimization of each chamber's function, achieving uniform heating through circulating particles while simplifying the overall structure compared to conventional multi-pipe furnaces
Solution Approach 2:
Circulating particles act as an intermediary heat transfer medium between the combustion chamber and the gasification chamber. The particles are heated in the combustion chamber using inexpensive fuel and then circulated to the gasification chamber to provide uniform heating, eliminating the need for direct flame heating and complex burner systems
2Stability of the object's composition
If expensive fuel gas is used in conventional burners to achieve uniform burning, then uniform heating is maintained, but running cost increases
Solution Approach 1:
The circulating particles serve multiple functions: they are heated in the combustion chamber using inexpensive fuel (such as coal, biomass, or waste materials), then circulated to the gasification chamber to provide uniform heating. This multi-functional use of circulating particles enables uniform burning while dramatically reducing running costs by replacing expensive fuel gas with cheaper fuel sources
Solution Approach 2:
The system uses inexpensive fuel materials (coal, biomass, waste) in the combustion chamber to generate heat, which is then transferred via circulating particles to the gasification chamber. This self-service approach allows the system to produce its own heating requirement using low-cost fuel, eliminating dependence on expensive fuel gas
3Use of energy by moving object
If residue and circulating particles are moved between heat decomposition gasification furnace and fluidized-bed combustion furnace, then heat transfer is achieved, but it becomes difficult to balance raw material supply with heat required for reformation
Solution Approach 1:
The system employs dynamic control of fluidizing air supply to independently regulate the circulation rate of particles between chambers. By adjusting the fluidizing air flow in each chamber, the system can dynamically balance the heat transfer rate with the raw material supply rate, ensuring optimal reformation conditions without complex mechanical linkages
Solution Approach 2:
The system uses feedback control through fluidizing air regulation to balance heat supply with raw material supply. By monitoring the reformation process and adjusting the fluidizing air flow accordingly, the system maintains optimal particle circulation rates that match the heat requirements of the reformation process
4Use of energy by moving object
If part of raw material is used as fuel for heat generation, then heat for reformation is obtained, but the amount of reformed gas produced is substantially reduced
Solution Approach 1:
The system segments the fuel function from the raw material function by using a separate combustion chamber dedicated to fuel combustion. Inexpensive fuel materials are combusted in the combustion chamber to generate heat, while the gasification chamber processes raw materials for reformed gas production. This segmentation ensures that raw materials are not consumed as fuel, maximizing reformed gas production while meeting heat requirements
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 system enables the stable and economic reformation of hydrocarbon gas, heavy oil, and oil refining pitch, increasing the production of reformed gas while reducing operational costs by utilizing inexpensive heating fuels and simplifying the control of heat and material supply.
Implementation Method 1
a fluidized-bed combustion furnace for heating the circulating particles guided from the fluidized-bed reforming furnace through combustion of heating fuel
Implementation Method 2
a fluidized-bed reforming furnace for heating, through circulating particles, a raw material to be reformed fed together with steam to reform the raw material into reformed gas
Implementation Method 3
a separator for separating high-temperature fluid discharged and guided from the fluidized-bed combustion furnace into exhaust combustion gas and the circulating particles
Data Source
AI summary
Inexpensive heating fuel is used to generate heat required for completion of reformation of raw material to be reformed such as hydrocarbon gas, heavy oil or oil refining pitch so that the raw material may be reformed economically and stably. A reformer has a raw material feeder that feeds a predetermined amount of raw material to be reformed to a fluidized-bed reforming furnace; a fuel feeder feeds heating fuel to a fluidized-bed combustion furnace; and a controller regulates the fuel to be fed to the combustion furnace so as to impart heat to the circulating particles in the combustion furnace such that the raw material fed to the reforming furnace can be completely reformed in the reforming furnace.