Solid-Fuel Boiler With Belt Conveyor Flame-Spread Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing boilers face challenges in efficiently applying flame to a steam drum and water pipes due to limited flame spread and difficulty in adjusting vapor output, leading to energy inefficiency and inability to match vapor demand.
Innovation Solution
A boiler design featuring a belt conveyor system with a movable loader and fuel supplier that allows direct introduction of solid fuel into the combustion chamber, enabling adjustable flame spread and thickness control, along with partitioned combustion chambers and forced draft fans for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a burner is used to supply fuel through a fuel supply passage to the primary combustion chamber, then the combustion efficiency is improved, but the flame spread area is limited and cannot effectively heat the steam drum and water pipes over a wide area
Solution Approach 1:
The invention extracts the fuel supply mechanism from the traditional burner configuration and introduces solid fuel directly into the combustion chamber through a fuel supply port. This allows the fuel to be distributed over a wider area directly on the combustion chamber floor, enabling the flame to spread across a larger surface area and effectively heat the steam drum and water pipes throughout the combustion chamber.
2Device complexity
If the flame spreads from a single opening point in the combustion chamber, then the combustion process is simplified, but it is difficult to adjust the vapor output to match the variation in vapor demand
Solution Approach 1:
The invention introduces a movable loader on a belt conveyor system that can dynamically adjust the position, thickness, and distribution of solid fuel across the combustion chamber. This dynamic adjustment capability allows the system to adapt vapor output to varying demand while maintaining a relatively simple combustion process structure.
Solution Approach 2:
The invention changes the physical parameters of fuel supply by controlling the thickness of the solid fuel layer on the movable loader and the speed of the belt conveyor. By adjusting these parameters, the system can control the rate of fuel combustion and consequently adjust the vapor output to match varying demand without complex control mechanisms.
3Device complexity
If solid fuel is supplied through a burner's fuel supply passage, then the fuel delivery mechanism is compact, but the fuel cannot be directly introduced into the combustion chamber for efficient thermal energy transfer
Solution Approach 1:
The invention introduces a belt conveyor with a movable loader as an intermediary mechanism between the fuel supply port and the combustion chamber. This intermediary system enables solid fuel to be directly introduced into the combustion chamber and positioned optimally for efficient thermal energy transfer to the steam drum and water pipes, while maintaining a compact overall structure.
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 design enables easy adjustment of vapor output to match demand, enhances energy efficiency, and allows for the direct application of thermal energy to steam drums and water pipes, improving overall boiler performance.
Implementation Method 1
a belt conveyor (120) including a movable loader (120a), disposed on a bottom of the combustion chamber (100F), and configured to move solid fuel on the movable loader (120a) in the combustion chamber (100F)
Implementation Method 2
The fuel supplier (130) includes a thickness adjuster (131) for adjusting a thickness of the solid fuel on the movable loader (120a) of the belt conveyor (120)
Implementation Method 3
a heat exchanger (140) configured to transfer, to water, thermal energy obtained by burning solid fuel in the combustion chamber (100F)
Implementation Method 4
a forced draft fan (160) connected to the combustion air inlet (114a) via an air intake duct (161)
Data Source
AI summary
A boiler 7 includes: a combustion furnace 100 having a combustion chamber 100F therein; a heat exchanger 140 configured to transfer, to water, thermal energy obtained by burning a solid fuel in the combustion chamber 100F; a belt conveyor 120 including a movable loader 120a, disposed on a bottom of the combustion chamber 100F, and configured to move the solid fuel on the movable loader 120a in the combustion chamber 100F; and a fuel supplier 130 connected to a fuel supply port 111a that communicates an inside and an outside of the combustion furnace 100. The belt conveyor 120 has a starting point below the fuel supply port 111alb . The fuel supplier 130 includes a thickness adjuster 131 that adjusts a thickness of the solid fuel on the movable loader 120a of the belt conveyor 120.