Viscosity Control for Low-Grade Fuel Atomization
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Solution Overview
Problem
Current boilers face inefficiencies in combusting low-grade fuels like Oil Heavy Residue due to their coking temperatures being close to optimal atomization temperatures, leading to coke formation and decreased combustion performance, which is exacerbated by the need to dilute fuels to lower viscosity, further reducing efficiency.
Innovation Solution
A system and method utilizing a temperature controller and sensor to adjust the viscosity of the fluid prior to atomization, based on measured viscosity, target atomization-viscosity, and coking temperature, using a heat-transfer medium to maintain the fluid at optimal atomization temperatures without exceeding coking temperatures, thereby preventing coke formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the temperature of low-grade fuel is increased to reduce viscosity for better atomization, then the atomization quality improves, but the fuel approaches its coking temperature which causes coke formation and clogs the atomizer
Solution Approach 1:
The system employs a temperature sensor to continuously monitor the fuel temperature and provides feedback to the temperature controller. This closed-loop feedback mechanism allows the system to adjust the heating power in real-time to maintain the fuel temperature within the optimal range for atomization while preventing it from reaching the coking temperature, thus resolving the contradiction between achieving good atomization and preventing coke formation.
Solution Approach 2:
The system dynamically adjusts the temperature parameter of the fuel based on the specific requirements of different low-grade fuels. By precisely controlling the temperature to be above the optimal atomization temperature but below the coking temperature, the system changes the thermal state of the fuel to achieve both good atomization quality and prevent harmful coke formation.
2Duration of action of moving object
If dilution with kerosene and/or water is used to decrease the viscosity of low-grade fuels, then the viscosity reduces and atomization becomes easier, but the combustion performance of the boiler decreases
Solution Approach 1:
Instead of changing the chemical composition of the fuel through dilution, the system changes the physical parameter (temperature) of the pure low-grade fuel. By heating the fuel to reduce its viscosity while maintaining its original composition, the system achieves both reduced viscosity for better atomization and preserved combustion performance, eliminating the need for dilution.
3Reliability
If the boiler is designed to combust fuels with optimal atomization temperatures much lower than coking temperatures, then coke formation is prevented, but the ability to efficiently combust low-grade fuels is hindered
Solution Approach 1:
The system introduces dynamic temperature control to the fuel supply process, allowing the operating temperature to be adjusted in real-time. This enables the boiler to efficiently combust low-grade fuels by maintaining their temperature above the optimal atomization point while dynamically preventing it from reaching the coking temperature, thus achieving both high combustion efficiency and reliable coke prevention.
Solution Approach 2:
The system performs preliminary heating of the low-grade fuel before it reaches the combustion chamber and atomizer. By pre-heating the fuel to the optimal temperature range, the system ensures that the fuel has reduced viscosity for good atomization while still being below the coking temperature, thus preventing coke formation before it can occur in the atomizer or combustion chamber.
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 approach allows for efficient combustion of low-grade fuels by maintaining the fluid at optimal viscosity for atomization while preventing coke formation, enhancing boiler efficiency and extending the lifespan of atomizers and boiler components.
Implementation Method 1
a temperature controller for adjusting the temperature of a fluid prior to atomization. The temperature controller includes a body configured to exchange heat between the fluid flowing in a conduit and a heat-transfer medium
Implementation Method 2
The viscosity of many fuels decreases as temperature increases. Thus, many fuels have an optimal atomization temperature that corresponds to their optimal atomization viscosity
Data Source
AI summary
A system for regulating the viscosity of a fluid prior to atomization includes a temperature controller configured to adjust a temperature of a fluid flowing in a conduit prior to atomization of the fluid by an atomizer fluidly connected to the conduit and a sensor in communication with the temperature controller such that the sensor can provide an indicator to the temperature controller of a viscosity of the fluid flowing in the conduit prior to atomization. An adjustment to the temperature of the fluid by the temperature controller is based at least in part on the measured viscosity indicator of the fluid, a target atomization-viscosity of the fluid, and a coking temperature of the fluid.