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SZL Series Biomass Water Tube Chain Grate Steam Boiler

Rated Capacity : 4~25 t/h
Pressure : 1.25~2.5 Mpa
Certificate : ISO9001, CE, BV, SGS, ASME
Fuel : Biomass fuel (wood chips, bamboo chips, straw, rice hull, peanut shell, bagasse, mustard stalk, cotton stalk, cotton seeds, coconut shell, corncob, waste cloth, etc.)
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Product Description
The new type SZL water-cooling sealing assembly chain grate series boiler is the new assembly boiler developed by Zhongding Boiler and Xi’an Jiaotong University. The boiler inherits the domestic current mature technique of SZL assembly chain grate boiler, gains technological breakthrough on the following five areas: furnace with water-cooling chamber, back-arch structure design, boiler design with low thermal inertia, seal structure on membrane wall, and contact side seal of the grate. This is the national patent, and the patent number is ZL 2009 2 0089355.7.
This SZL series steam boiler is widely used for school, textile mill, garment factory, printing and dyeing mill, restaurant, food &beverage factory, bean product factory, meat product plant, distillery, package plant, building materials factory, coating factory, swimming pool, etc.
1.The design of arch utilizes Xi’an Jiaotong University’s research achievement, which wins “Second Prize of National Scientific and Technological Progress”. The collection of arch structure and fore-and-aft arch outlet, forms a obvious inverted “ɑ” flue gas flue process, various kinds of biomass fuels are adaptable.
2.The structure of fore-and-aft arch is water-cooling “wet arch”. The arch tubes not only can improve the strength of arch, also keep the constant temperature in furnace, and protect the furnace arch.
3.The structure of double side air-intake and independent wind chamber guarantees the combustion efficiency, by adjusting the air capacity and pressure in air chamber flexibility.
4.Push-pull type damper ash removal device is employed, the damper uses the seal structure of heat resistant cast iron, effectively prevents deformation of secondary combustion and grate air leakage.
5.The rolling bearing is used for grate back bearing, avoid the sliding bearing’s disadvantages that overheating and seizing regularly.
6.The light railway I-column steel is used for the bottom rail of grate, it is wear-resisting and difficult deformation, increases the reliability of grate operation.
7.The length of grate is 500~1000mm longer than the other same typed products in domestic, extends coal combustion time, decreases carbon content in boiler slag, improves thermal efficiency of boiler.
8.The weight of furnace wall is light, the light thermal-insulated material is used, which decreases the heat absorption capacity of furnace wall itself. The boiler thermal inertia is small, furnace temperature increases quickly, boiler start and stop quickly.
1. Furnace with water-cooling chamber. The left and right membrane walls reach the upper surface of grate, constitute water-cooling chamber together with the front and back water-cooling arches, increases the furnace radiation heating area, improves the output efficiency and thermal efficiency.
2. Innovative back-arch structure. The tubes come from the bottom of boiler barrel constitute the back-arch together with the both sides headers, solves the problem that lift the boiler height when layout the water-cooling arch, which leads to the waste of boiler’s space.
3. Boiler design with low thermal inertia. Thanks to the innovative water-cooling sealing chamber and the artful back-arch structure, the structure is more compact, the furnace radiation heating area increases more than 50%. The thermal inertia decreases 70% with the use of light furnace wall. Not only the output improved, the combustion efficiency is higher, also the load regulation is more flexible.
4. Water cooling sealing structure on membrane wall. Good sealed and air tight, decrease the radiation loss and smoke heat loss, increase the thermal efficiency and improve the working environment.
5. Contact side seal structure of the grate.The left and right headers are anti-coking, remove the cast iron side sealing cast iron, solves the problem of grate stucked by cast iron seal, side seal burnout because of air leakage and air flows unevenly.

  Model Rated Evaporation Capacity (t/h) Rated Steam Temperature (℃) Working Pressure (Mpa) Feed Wate Temperature(℃) Design Efficiency (%) Exhaust Gas Temperature(℃)
SZL4-1.6/1.25-AII/WII 4 204/194 1.6/1.25 20 78.51/78.63 159.9
SZL6-1.6/1.25-AII 6 204/194 1.6/1.25 20 82.84/80.92 140/155
SZL8-1.25-AII 8 194 1.25 20 80.11 147
SZL10--1.25-AII/T 10 194 1.25 20 80.36/81.32 150/
SZL10-2.5-AII 10 226 2.5 20 80.92 155
SZL10-1.6-AII 10 204 1.6 20 80.25 150
SZL15-1.25-T/AII 15 194 1.25 105 80/79.71 170
SZL15-1.6/350-AII 15 350 1.6 104 82.21 132
SZL20-1.25-AII 20 194 1.25 105 82.68/80.90 145/168
SZL20-1.6-AII 20 204 1.6 105 83.20 139
SZL20-2.5-AII 20 226 2.5 105 82.77 143
SZL25-2.5-AII 25 226 2.5 105 78.40 160
SZL25-1.25/300-AII+Q 25 300 1.25 105 80.95 150
Note: Parameters is for reference only, if any change should follow actual drawings

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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