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Working Principle of Cast Iron Finned Economizer
- By Alex Hu
- 08/08/2026
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Counter-flow Heat Exchange Logic It adopts a counter-flow heat exchange structure and is installed in the flue at the boiler tail. High-temperature flue gas flows downward to scour the outer fins, while low-temperature boiler feedwater flows upward inside cast iron tubes. Opposite flow direction maintains the maximum temperature difference for stable heat transfer. Internal Water Circulation Process Cold softened feedwater enters the bottom flange header, then flows upward layer by layer through integrally cast curved elbows of each finned tube. Heat transfers continuously from cast iron wa..
Introduction to Cast Iron Finned Economizer Tubes
- By Alex Hu
- 08/08/2026
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1. Product Definition & Structure This equipment is a modular cast iron finned economizer, assembled by multiple independently cast curved finned economizer tubes into an integrated heat exchange box. It is an energy-saving tail heat exchange device specially for coal-fired & biomass chain / reciprocating industrial boilers. Single unit: The second picture displays a single cast iron finned economizer tube, integrally cast with dense radiating fins to expand flue gas heat exchange area. Curved connecting elbows on both ends enable multiple tubes to form a complete water circuit in se..
what is boiler chain grate?
-1140x380.png "what is boiler chain grate?")
- By Alex Hu
- 01/08/2026
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A boiler chain grate is a moving, conveyor-belt-like metal floor inside an industrial furnace that feeds solid fuel, moves it through active combustion zones, and drops out the remaining ash. It is widely used for burning coal and biomass pellets in factories and power plants. How It WorksFuel feed: Solid fuel drops from a storage hopper onto the front of the moving metal chain link belt.Combustion zones: The continuous loop carries the fuel slowly past a hot brick arch that dries and ignites it.Air control: Fans blow air up through tiny gaps in the moving metal grate bars to feed oxygen to..
Technical Analysis of Active and Driven Grate Bars for Travelling Chain Grate
- By Alex Hu
- 01/08/2026
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The travelling chain grate is the core fuel conveying and combustion equipment for medium and small coal-fired and biomass stoker boilers. The complete grate system is assembled by active grate bars (drive bars) and driven grate bars (follower bars) arranged alternately in series. The two types of bars differ completely in structure, stress principle and operational functions. With clear division of labor and coordinated operation, they jointly realize the full-process functions of fuel conveying, ventilation combustion, sealing, anti-leakage and slag removal. Their material selection, m..
Detailed Performance of Silicon-5 Heat-Resistant Cast Iron (RTSi5) Grate Bars Under High-Temperature Conditions
-1140x380.png "Detailed Performance of Silicon-5 Heat-Resistant Cast Iron (RTSi5) Grate Bars Under High-Temperature Conditions")
- By Alex Hu
- 01/08/2026
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1. Basic Material Parameters Grade: RTSi5, national standard heat-resistant cast iron; silicon content ranges from 4.5% to 5.5%, with ferrite as the main matrix structure. Designed long-term safe operating temperature: 750℃ ~ 850℃; short-term peak temperature tolerance: within 880℃. 2. Comprehensive Performance Within the Optimal Temperature Range (750–850℃, Conventional Boiler Operating Conditions) This is its peak service condition: (1) High-Temperature Oxidation Resistance (Primary Core Advantage) A dense, intact silicon dioxide (SiO₂) protective film automatically forms on the heated..
What is the applicable moisture range of fuels for biomass reciprocating grates?
- By Alex Hu
- 01/08/2026
- 0 comments
1. Optimal High-Efficiency Moisture Range Loose conventional biomass fuels (wood chips, chopped straw, etc.): as-received moisture content 15%~25%. This range balances drying rate, stable combustion performance and thermal efficiency, and perfectly matches the structural design of the pre-drying zone of reciprocating grates. Molded biomass pellet fuels: as-received moisture content ≤15% (ideal range: 8%~15%), delivering the most stable combustion and maximum thermal efficiency. 2. Maximum Allowable Limit (Extreme Adaptation Range) Reciprocating grates equipped with optimized drying zo..
Reciprocating Biomass Grates: Core Differences Between S-Type, Wide Flat & T-Type Grate Bars
- By Alex Hu
- 01/08/2026
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These three most widely used reciprocating grate bars differ entirely in interlocking profile structure, air throughput, ash leakage performance, fuel stirring & pushing effect, and applicable fuels. Detailed breakdowns and selection guidelines are listed below for your presentation to overseas customers. 1. S-Type Grate Bars Structural Features Curved S-shaped surfaces on both sides interlock with adjacent pieces. When movable and fixed grate bars slide alternately, the overlapping surfaces form a continuous labyrinth seal. Advantages The lowest material leakage rate; ideal for f..
Classification of Commonly Used Boiler Doors Matched with Boiler Grates
- By Alex Hu
- 01/08/2026
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I. Overall Classification Overview Standard supporting doors for biomass chain grates and reciprocating grates are mainly divided into five categories: manhole doors, fire observation doors, ash cleaning doors, fuel charging doors and explosion relief doors. Fire observation doors, ash cleaning doors and manhole doors are the most frequently purchased items by field engineers. Standard Materials Grey cast iron HT200, heat-resistant ductile cast iron for general service conditions; RTCr series heat-resistant cast iron is adopted for high-temperature working environments. 1. Fire Observa..
Differences Between Travelling Chain Grate and Reciprocating Grate
- By Alex Hu +86 15382281005
- 01/08/2026
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Travelling chain grate is commonly referred to as chain grate, the most widely adopted grate for stoker-fired boilers. Reciprocating grate is categorized into inclined reciprocating grate and horizontal reciprocating grate. Both fall under the moving stoker grate type. The core distinction lies in: fuels move synchronously together with the grate on a chain grate; while grate bars shift alternately on a reciprocating grate, continuously turning and pushing fuels forward. 1. Differences in Core Structure & Working Principle 1. Travelling Chain Grate Chain Grate Boiler Structure: Spr..
How to Choose Between Travelling Chain Grate and Reciprocating Grate Based on Fuel Characteristics
- By Alex Hu
- 01/08/2026
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Fuels Prioritized for Travelling Chain Grate (Chain Belt Grate) Applicable Features Uniform particle size, low moisture content, stable calorific value, low caking tendency Coal Fuels Class II high-quality bituminous coal; particle size: 6~50 mm; as-received moisture (Mar) ＜ 20%; ash fusion temperature ＞ 1200℃; weakly caking coal. Unsuitable fuels: strongly caking coal, high-ash inferior coal, lignite (excessively high moisture), raw coal with excessive pulverized coal. Biomass Fuels (Molded) Biomass pellets, briquettes, regularly sized wood chips (uniform particle size, moisture co..