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Wood Fired Chain Grate Water Tube Boiler

Rated Capacity : 2t/h~30t/h
Pressure : 0.7Mpa-3.8Mpa
Application : wood processing, food & beverage, textile plant, rice mill, paper industry, etc.
Certificate : ISO9001, CE, BV, SGS, ASME
Fuel : wood chips, wood block, wood batten, bamboo, bagasse, and other biomass fuels
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Product Description
New type SZL boiler is the national patent products of Zhongding Boiler, the patent No. is ZL 2009 2 0089355.7. Wood fired chain grate water tube steam boiler is horizontal type double drums boiler with high steam quality, the combustion equipment is chain grate. Zhongding boiler takes several breakthroughs on boiler design, such as membrane water cooling wall, low thermal inertia design, and water cooling combustion chamber. The convection heating area increase more than 50%, and by using the light furnace wall, the thermal inertia decrease 70%, to improve thermal efficiency. SZL series wood fired chain grate water tube boiler has the advantages of compact structure, high thermal efficiency, high steam quality, sufficient output, and convenient operation. 

Characteristics of Chain Grate

1) The chain grate is 500~1000mm longer than others, lengthen the fuel combustion time, improve combustion efficiency.
2) The grate adopts contact under-seal structure, the left and right header are anti-coking headers, resolves the problems of grate stuck and air leakage.
3) The small scale chain grate boiler could resist the temperature as high as 1200℃, long working life.
4) The chain grate has a low biomass fuel leakage because of the small gap.
5) Mechanized feed, high automatic degree, decrease labor cost.
6) Convenient for maintenance, it could be done without boiler shut down.
7) Based on customers’ requirement and fuel characteristics, the grate could be designed as reciprocal grate.

1. Boiler Customization

Zhongding Boiler owns a mature R&D and design team, and cooperates with multiple scientific research institutions for a long time, i.e. Tsinghua University and Xi’an Jiaotong University. Zhongding Boiler could customize the boiler based on the requirement of customers, water quality and fuel characteristics, to meet the operating requirement and maximum the boilers’ effectiveness.

1) Grate  ----  Based on the fuel characteristics (size, humidity, and volatility, etc.), equipped with different grate, such as fixed grate, chain grate, and moving grate, etc. The chain grate could divided into small flaker grate, chain belt grate, bar grate. 
2) Air Pre-heater  ----  For the fuel with high humility, could equipped with air preheater, uses the waste heat of flue gas to heat the air, and improve the combustion condition, decrease heat loss form incomplete combustion heat loss.
3) Water Treatment Equipment  ----  Based on the water quality, could equipped with different water treatment equipment, generally, there are soften water treatment and reverse osmosis water treatment equipment.
4) Secondary Air Device  ----  Based on the fuel characteristics, could equipped secondary air device, to decrease the heat loss of incomplete combustion, improve boiler thermal efficiency.
5) Electric Control Cabinet  ----  Customers could choose PLC or touch screen control cabinet, also, the brand of electric elements could be designated.
6) Variable Frequency Motor  ---- The boiler could adopt variable frequency water supply pump, blower fan and induced draft fan, etc., save energy and decrease operation cost.
7) Shell Color  ---- Customer could designate the color of boiler shell, elegant appearance.
2. High Quality 


1) Zhongding Boiler owns a professional design engineer team, before manufacturing, every boiler design drawing will be approved by boiler and pressure vessel experts of CSBTS ( State Bureau of Quality Technical Supervision ), and then the boiler could be produced only if qualified.
2) To ensure the raw materials quality, all the steel plates are special-used for boiler with the Inspection Certificates. The raw material materials are inspected when entering factory, and only the qualified material could be put in storage and used for production.
3) To ensure the welding quality, there a professional welding team, including more than 30 senior welders. The welding materials are stored under constant temperature and humidity, to ensure the welding material quality.
4) Nondestructive testing will be done to ensure the welding quality, by using x-ray detection, ultrasonic flaw detection, magnetic test, or penetration test, etc.
5) Hydrostatic test will be done to ensure the leakproofness and strength of boiler pressure parts, generally, the testing pressure is 12.5 times of rated working pressure.
6) All the raw materials and boilers are supervised and inspected by the experts of Inspection Institution for Boiler and Pressure Vessel. There are international quality certificates of ISO 9001 and CE, we can also offer the inspection report of SGS, BV, etc., Quality Certificates, Energy audit report, and Energy Efficiency Test Report, etc.

3. Advanced Technology and Structure

4. Professional Installation and After-sale Team

1) Professional engineer installation team offer the door to door installation and after sale service. The boilers will operate smoothly and safety, and you will get them without worries.
2) 24 hours hot-line to solve your problems, and offer the professional technical supports and after sale service in time to all over the world.
5. Convenient Maintenance

1) The chain grate is convenient for maintenance, it could be done without boiler shut down.
2) There are manhole, head hole, and special hand hole on the boiler, convenient for boiler internal installation, inspection and clean.
Structure and Combustion Process

The front boiler body is arranged around with water cooled wall, the upper part is connected with upper drum, the downpart is connected with header, to consist the combustion chamber. To absorb the furnace radiant heat sufficiently, there is intensive convection tube bundle between the upper drum and lower drum.

The bagasse fuel drops down at the front of grate from fuel hopper, move with the chain grate, after preheat dry distillation, combustion, and burnout, the slag fall into slag hopper, and then removed outside the boiler. The high temperature smoke gas flow through the convection heating surface, economizer, dust remover in order, and finally discharged into the atmosphere by induced draft fan through chimney.
Model Steam Capacity (t/h) Working Pressure (MPa) Thermal Efficiency (%) Body Heating Area (m2) Overall Dimension
L×W×H (m)
Weight (t)
SZL4-1.20/1.6/2.5-T 4 1.25/1.6/2.5 81 99.5 7.46×2.65×3.52 32
SZL6-1.20/1.6/2.5-T 6 1.25/1.6/2.5 81 134 7×2.7×3.5 21
SZL10-1.20/1.6/2.5-T 10 1.25/1.6/2.5 81 233.6 7.89×3.26×3.53 28
SZL15-1.20/1.6/2.5-T 15 1.25/1.6/2.5 82 310.5 10×3.2×3.5 30
SZL20-1.20/1.6/2.5-T 20 1.25/1.6/2.5 82 478 11×3.2×3.5 35
Note: 1. Parameter is for reference only, if any changes should follow the factory technical data.
2. Our company can design boiler products based on customers’ requirement and different biomass pellet fuels.

Transaction Process
Customer Inquiry -- Offer Professional Consulting Service -- Place Order -- Customize Boiler Based on Customers’ needs --Production-manufacturing -- Payment -- Impeccable After Sale Service (installation and debugging, periodic maintenance, etc.)

Offered Technical Documents
Installment and Operation Instruction Quality Certificate
Inspection Certificate of Boiler Quality General Drawing of Boiler
Foundation Drawing Boiler Body Drawing
Boiler Room Design Drawing Drawing of Valves, Instruments and Accessories

Company Strength
Zhongding Boiler is the industrial boiler professor of China, it is referred as technical innovated enterprise. The manufacturer base is located in Zhengzhou Airport Economy Zone, and covers an area of 130 thousands m2. The company owns about 800 employees, including 110 technical engineers, and about 700 sets advanced manufacturing equipment. Zhongding Boiler concentrates on the invention of high-tech and energy saving boilers, has owned more than 20 sorts national patent technologies. 


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