Powder Fuel Combustion Apparatus with Inclined Bottom Air Nozzle
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Solution Overview
Problem
Existing combustion apparatuses for pulverized coal in boilers require complex configurations and high maintenance costs due to the need for unburned combustibles measurement and air direction adjustment devices, which are not feasible for small-scale plants.
Innovation Solution
A combustion apparatus with a primary and secondary combustion chamber, where air is supplied through a bottom portion air injection nozzle to efficiently combust powder fuel without the need for unburned combustibles measurement devices, allowing for complete combustion and ashing without white smoke occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unburned combustibles measurement devices and air direction adjustment devices are installed to improve combustion efficiency, then combustion efficiency is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The combustion system uses self-service principles by allowing the combustion process itself to provide the necessary information for control. The inclined bottom portion naturally accumulates unburned matter, and the combustion state self-indicates the need for air supply adjustment, eliminating the need for external measurement devices.
Solution Approach 2:
The invention extracts and removes the complex measurement and control devices from the system. Instead of installing sensors and adjustment mechanisms, the patent simplifies the system by taking out these unnecessary components and relying on the inherent combustion dynamics and simple structural features.
2Productivity
If air direction adjustment devices are installed to improve combustion efficiency, then combustion efficiency is improved, but ease of operation deteriorates due to required adjustments
Solution Approach 1:
The invention applies dynamics by making the air supply system adaptable without requiring manual adjustment. The system dynamically responds to combustion needs through the inclined bottom structure that naturally guides air flow and accumulates unburned matter in a controlled manner, allowing the system to self-adjust during operation.
3Reliability
If complex measurement and control systems are installed to reduce unburned combustibles, then combustion completeness is improved, but maintenance costs increase
Solution Approach 1:
The invention replaces expensive, complex measurement and control systems with simple, inexpensive structural features. The inclined bottom portion is a passive, maintenance-free structural element that permanently solves the unburned combustibles problem without requiring costly sensors, actuators, or control systems that would need maintenance.
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 enables efficient combustion of powder fuels like carbonized synthetic resin and waste plastic, reducing maintenance and operational costs by eliminating the need for complex measurement devices and air direction adjustments, while preventing white smoke and ensuring complete combustion.
Implementation Method 1
a primary combustion chamber (20) configured to combust the powder fuel in an interior thereof
Implementation Method 2
a secondary combustion chamber (50) configured to combust a combustion gas discharged from the primary combustion chamber (20)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention provides a combustion apparatus and a combustion method capable of ashing matter to be combusted inside a combustion chamber efficiently without providing a device such as an unburned combustibles measurement device and without varying the direction of injection of air into the combustion chamber. The powder fuel combustion apparatus 1 includes a fuel supply device 10, a primary combustion chamber 20, a secondary combustion chamber 50, an air supply/ash discharge device 32, and a cyclone dust collector 60. An inclined portion 23a is formed at a bottom portion 23 of the primary combustion chamber 20, and the inclined portion 23a includes bottom portion air supply ports 31 and an air supply/ash discharge device 32. The air supply/ash discharge device 32 includes a bottom portion air injection nozzle 34 and an ash delivery device 35. The bottom portion air injection nozzle 34 has upper and lower ends opened, and a plurality of injection ports 34a through which air is injected are formed on a side surface. During combustion of the powder fuel F, air having a strong wind pressure is injected through the bottom portion air injection nozzle 34 either regularly or irregularly to agitate the powder fuel F and achieve a good combustion state.