DZL Series Coal Fired Hot Water Boiler

Introduction

DZL series coal fired hot water 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 coal fired hot water 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 in reasonable arrangement and high efficiency. This series boiler adopts several environmental protect measures (bag dust collector, double towers desulfurization, etc.) to meet the national emission requirement
This 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. 



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 repaired 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

.     Reliable boiler auxiliaries and multiple safety protection devices, such as water level alarm, and safety valve, etc.


.     Full automatic interlock protection program, has the protection function of water shortage, over pressure, over temperature, gas leakage, flame out, electric leakage, and phrase-lacking or overloading of motor, etc.

.     Excellent and complete instrument system and PLC full automatic intelligent control system. The boiler could operate automatically after starting, the whole system could be controlled by the touch screen, operate conveniently. The internal wiring and elements are installed clean and tidy, to ensure the safe operation.




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 repaired 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 fuels drop down at the front of grate from coal hopper, move with the grate. After dry distillation, combustion, and burnout, the slags fall into slag hopper, and then they are removed outside the boiler. Smoke gas and air form a vortex between the front arch and back arch, at the same time, heat the front arch and improve the ignition condition. The exhaust gas flows through smoke window, convection bank, the front smoke chamber, thread smoke tubes, economizer, dust remover in order, and finally discharged into the atmosphere by induced draft fan through chimney.

Parameter

Model	Rated power (MW)	Rated pressure (Mpa)	Supply water Temperature (℃)	Return water temperature (℃)	Fuel consumption (kg/h)	Thermal Efficiency (%)	Overall Dimension   L*W*H（m）	Weight (t)
DZL0.7	0.7	1.0	95	70	151	82	5.1x2.2x3	17
DZL1.4	1.4	1.0	95	70	302	82	5.5x2.3x3.3	23
DZL2.8	2.8	1.0	95	70	600	82	6.6x2.6x3.6	25
DZL4.2	4.2	0.7	95	70	880	82	7.5x2.9x3.8	35
DZL5.6	5.6	0.7	95	70	1150	82	8.1x3.1x3.8	45
Note: 1. Parameter is for reference only, if any changes should follow the factory technical data. 2. Available fuel: coal, lower heating value: Q≈21,000 KJ/Kg

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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