Engineered Fuel Feed Stock from Municipal Solid Waste
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Solution Overview
Problem
The increasing scarcity and cost of fossil fuels, along with environmental concerns from pollutant emissions, necessitate the development of alternative fuels that can efficiently and cleanly generate energy and reduce greenhouse gas emissions, particularly from combustion and gasification processes.
Innovation Solution
An engineered fuel feed stock derived from processed municipal solid waste, optimized for specific chemical molecular characteristics such as carbon, hydrogen, sulfur, and ash content, is developed to serve as a substitute for coal in combustion and gasification processes, minimizing harmful emissions and producing high-quality synthesis gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If combustion is used for energy generation, then energy production is efficient, but pollutant emissions (nitrogen oxides, sulfur dioxide, fine particles) increase
Solution Approach 1:
The patent changes the chemical composition parameters of the fuel by blending MSW with specific ratios of coal, petroleum coke, or biomass. This creates a customized fuel mixture that maintains high energy density while reducing sulfur and nitrogen content, thereby lowering pollutant emissions during combustion without sacrificing energy production efficiency
Solution Approach 2:
The invention creates a composite fuel material by combining multiple components (MSW, coal, petroleum coke, biomass) in specific proportions. This composite approach allows the fuel to exhibit both high calorific value from the energy-dense components and reduced emissions from the controlled composition, resolving the contradiction between efficiency and cleanliness
2Object-generated harmful factors
If gasification is used to produce synthesis gas, then pollutant emissions are reduced, but the process complexity and equipment requirements increase
Solution Approach 1:
The patent modifies the feedstock parameters (chemical composition, moisture content, calorific value) through controlled blending of MSW with other materials. This pre-conditioning of the fuel parameters enables it to be processed more efficiently in gasification systems, reducing the complexity of the gasification process while maintaining low emissions
Solution Approach 2:
The invention uses coal, petroleum coke, or biomass as intermediary materials that facilitate the gasification process. These materials have stable combustion characteristics and serve as a bridge between the variable MSW feedstock and the gasification process, simplifying equipment requirements and operational control
3Productivity
If MSW is used as fuel, then waste management is improved, but fuel consistency and quality control deteriorate
Solution Approach 1:
The patent applies parameter changes by adjusting the chemical composition of the fuel blend to compensate for the variability in MSW. By controlling the ratios of MSW to stabilizing materials (coal, petroleum coke, biomass), the final fuel product achieves consistent calorific value, moisture content, and combustion characteristics despite variations in the original MSW feedstock
Solution Approach 2:
The invention applies local quality by tailoring the fuel composition to specific operational requirements. Different blends can be created for different applications (combustion vs. gasification) by adjusting the local proportions of materials, allowing each fuel batch to have optimized properties for its intended use while maintaining overall consistency
4Use of energy by moving object
If sulfur content in fuel is high, then energy density is maintained, but sulfur dioxide emissions and environmental harm increase
Solution Approach 1:
The patent changes the sulfur content parameter of the fuel by selecting and blending materials with different sulfur characteristics. By controlling the proportion of high-sulfur materials (petroleum coke) versus low-sulfur materials (biomass, treated MSW), the final fuel achieves an optimal balance between energy density and sulfur emissions, reducing SO2 emissions while maintaining adequate calorific value
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
The engineered fuel feed stock provides a cost-effective, environmentally friendly alternative for energy production, reducing pollutant emissions and greenhouse gas footprints while maintaining energy efficiency and quality, suitable for various thermal conversion processes.
Implementation Method 1
Combustion takes place in a reactor in the presence of excess air, or excess oxygen
Implementation Method 2
Gasification also takes place in a reactor, although in the absence of air, or in the presence of substoichiometric amounts of oxygen
Implementation Method 3
In the first stage, pyrolysis releases the volatile components of the fuel at temperatures below 600° C. (1112° F.), a process known as devolatization
Data Source
AI summary
Disclosed are novel engineered fuel feed stocks, feed stocks produced by the described processes, and methods of making the fuel feed stocks. Components derived from processed MSW waste streams can be used to make such feed stocks which are substantially free of glass, metals, grit and noncombustibles. These feed stocks are useful for a variety of purposes including as gasification and combustion fuels.