Flame Ignition Device Using Impulse Discharge for Low Reactive Fuel
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Solution Overview
Problem
Existing methods for igniting and stabilizing the combustion of low reactive fuels like coal dust in thermal power plants face challenges due to high electric energy consumption and unreliable ignition, leading to torch extinction and inefficient combustion.
Innovation Solution
A device with an ignition chamber, alternating current source, and rod electrodes connected to both AC and DC sources, which creates a diffuse electric discharge and maintains a highly ionized pre-flame zone for efficient combustion, using a secondary air port to optimize torch formation and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric arc discharge is used to ignite low reactive fuels like coal dust, then ignition can be achieved, but electric energy consumption increases to 2-3% of thermal power
Solution Approach 1:
The patent changes the electrical parameters by using impulse voltage (10-50 kV) at low frequency (0.5-5 Hz) instead of continuous high-frequency discharge. This parameter transformation reduces energy consumption while maintaining ignition effectiveness for low reactive fuels like coal dust.
Solution Approach 2:
The invention employs periodic impulse discharges instead of continuous discharge. The low-frequency periodic operation (0.5-5 Hz) allows the system to accumulate energy efficiently and maintain reliable ignition with minimal energy input, directly addressing the energy consumption problem.
2Stability of the object's composition
If continuous electric discharge is used to maintain burning, then combustion stability improves, but device operation resource decreases to tens of hours
Solution Approach 1:
The periodic impulse discharge system allows electrodes to rest between impulses, reducing thermal accumulation and wear. This periodic operation mode extends electrode life to thousands of hours while maintaining combustion stability through controlled energy input at optimal intervals.
Solution Approach 2:
The system prepares the combustion zone by creating a stable ionized environment during each impulse, which facilitates subsequent combustion without requiring continuous high-energy discharge. This preliminary ionization action reduces overall energy requirements and extends device operation.
3Productivity
If secondary air is supplied directly to ignition chamber, then combustion intensity increases, but torch separation and extinction risk increases
Solution Approach 1:
The air supply system is segmented into primary air (for ignition zone) and secondary air (for combustion zone). This spatial segmentation allows controlled introduction of oxygen at different stages, intensifying combustion while preventing premature torch separation through staged air-fuel mixing.
Solution Approach 2:
Primary air is supplied beforehand to create a stable ignition environment, and secondary air is introduced afterward to intensify combustion. This preliminary preparation of the ignition zone ensures torch stability before combustion intensity is increased.
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
Ensures stable ignition and efficient combustion of low reactive fuels with minimal electrical energy consumption, reducing torch extinction and increasing the reliability and efficiency of fuel burning.
Implementation Method 1
creating a diffuse electric discharge, and applying the diffuse electric discharge to a border zone of the flame formation of the burning fuel torch
Implementation Method 2
an electric arc discharge is created in the ignition zone
Implementation Method 3
maintains a highly ionized pre-flame zone for efficient combustion
Data Source
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AI summary
The invention "Device and method for fuel flaring" relates to the field of energetics and can be used in thermal power plants, boiler houses, etc. to optimize and control the combustion process and ensure the ignition of boilers and stabilize the fuel burning, for example, coal dust, in the process of flaring thereof, without the use of additional highly reactive fuel. The claimed invention provides stable ignition, burning and efficient combustion of fuel, including the low reactive one, due to the fact that a constant voltage source is connected to at least one of the rod electrodes, relative to the shell of an ignition chamber, and a torch formation chamber with a secondary air port connected thereto is mounted at the outlet of the ignition chamber.