Solid Fuel Fired Steam Boiler

Introduction
Solid fuel fired chain grate boiler is single drum water tube and fire tube boiler, combustion equipment is chain grate. Water wall tubes at left and right sides of furnace are the radiated heating area. the two wings at furnace and screw fire tube in the drum are convection heating area. This boiler uses the upper drum, water wall tube and head are in symmetrical arrangement mode. The drum is welded assembly by cylinder and front back tube plate. This furnace structure is in reasonable arrangement and high efficiency, also, it adopts unique double secondary air design to improve the high combustion efficiency.
The solid fuel fired steam boiler uses the new scientific achievement, such as arch tube plate, screw fire tube to solve the problem of tube plate flaw, water wall tube explosion, low efficiency, insufficient output, poor adaptability of coal, improve the heat transfer.

The solid fuel fired steam boiler is wide adaptability of different fuels, such as coal, biomass fuel, wood pellet, bagasse, rice husk, straw, coconut shell, cotton seeds, corncob, peanut shell, waste cloth, etc. To avoid coking and improve combustion efficiency, adopts unique double secondary air design, to improve conditions of biomass fuel.

Characteristics of Chain Grate

1) The small scale chain grate boiler could resist the temperature as high as 1200℃, long working life.
2) The chain grate has a low coal leakage because of the small gap.
3) High automatic degree, decrease labor cost.
4) Convenient for maintenance, it could be done without boiler shut down.
5) Based on customers’ requirement and fuel characteristics, the grate could be designed as reciprocal grate.

Products Advantages
1. High Quality Assurance

1) There is a professional design engineer team, before manufacturing, every boiler design drawing have to 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) The welding quality will be further examined during boiler manufacturing, by using x-ray detection, ultrasonic flaw detection, magnetic test, or penetration test, etc.
5) To ensure the boiler quality, the leakproofness and strength of pressure parts will be tested. The hydrostatic test is done to make sure there are no water drop or water mist leakage appear on steal wall or welding joint, no water leakage appear at the place of expansion, and no obvious residual deformation and abnormal situation.
6) To ensure no problems before boiler delivery, all the raw materials and boilers are supervised and inspected by the experts of Inspection Institution for Boiler and Pressure Vessel. There are international uality 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.
2. Safety Assurance

3. High Efficiency Assurance

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.
Combustion Process


The solid fuel drops down at the front of grate from coal hopper, move with the grate, after preheat dry distillation, combustion, and burnout, the slag fall into slag hopper, and then removed outside the boiler. Smoke gas mix with air sufficient and form a vortex between the front arch and back arch, at the same time, it heats the front arch and improve the ignition condition. The exhaust gas enter into the convection bank through the smoke window at the upper of arch, then enter into thread smoke tube through the front smoke chamber, finally discharged into the atmosphere by induced draft fan through chimney after passing economizer and dust remover.

Parameter

Model	Steam capacity(t/h)	Rated pressure (MPa)	Thermal efficiency (%)	Available fuel	Fuel consumption   (kg/h)	Overall Dimension L×W×H (m)	Weight (ton)
DZL1-0.7/1.0/1.25-T	1	0.7/1.0/1.25	82	Coal, biomass pellet	~200	5.1×2.2×3	17
DZL2-0.7/1.0/1.25-T	2	0.7/1.0/1.25	82		~400	5.5×2.3×3.3	23
DZL4-1.25/1.6-T	4	1.25/1.6	82		~800	6.6×2.6×3.6	25
DZL6-1.25/1.6-T	6	1.25/1.6	82		~1200	8.2×2.9×3.8	35
DZL8-1.25/1.6-T	8	1.25/1.6	82		~1600	8.1×3.1×3.8	45
DZL10-1.25/1.6-T	10	1.25/1.6	82		~2010	Up 7.7×3.2×3.6 Down 8.6×3×2.6	Up 23 Down 28
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 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 Documentations
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
Sitong boiler is a national approved and designated enterprise, with design and manufacture license permits of Class A boiler and D1, D2 pressure vessel. The company has passed ISO 9001 international quality system certification, and gained the international certificates of CE, SGS, and BV, etc. The boiler products are exported to more than 60 countries. The factory covers an area of 120 thousands㎡, equipped with plenty of international advanced manufacture equipment, such as CNC cutting machine, automatic submerged arc welding machine, X-ray detection machine, etc.

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