Double Cyclone CFB Boiler Used in Thermal Power Plant

Rated Capacity : 25-130 t/h
Pressure : 3.82Mpa-5.29Mpa
Application : Thermal power plant
Certificate : ISO 9001, CE, BV, SGS, ASME
Fuel : different coals and biomass fuels
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Product Description
Zhongding biomass fired double cyclone circulating fluidized bed boiler with low speed is a new generation CFB boiler, it is the national patent product of Zhongding Boiler. Circulating fluidized bed boiler is consisting of combustion chamber, separator, fly ash circulating system, superheater, convection bank, economizer, and air preheater. The boiler inherits the original technology advantages, at the same time, makes big breakthrough on the technology of cyclone fluidized combustion, cyclone separator, and loop seal device. The thermal efficiency of biomass power plant boiler is about 5% higher than the other CFB boilers.

Technical Breakthroughs


Other Technical Advantages
1. High Thermal Efficiency

A. Integrate furnace, separator and loop seal system by using membrane water wall, compact structure.
B. The water cooling separator skeleton is membrane wall, prevents the low efficiency caused by air leakage.
C. The membrane wall could abort the heat of inner wall, allowing the residual carbon to burn in the separator (do not cause coking).
D. The wear resistance material of the separator liner is only 80 mm, low thermal inertia, quick start up and shut down, and achieve safe operation.
E. The external temperature of the membrane wall is low, low heat loss.
2. Advanced loop seal device

The loop seal device is composed of two membrane water walls, and the heat of fly ash could absorbed by the water wall tubes.

3. Anti wear design

A. The boiler uses low flow rate design, the area of the furnace is large and the smoke speed is low.
B. The buried pipe adopts anti-wear steel with the special size and angle, and reduce the flidization velocity, to reduce the abrasion.
C. The separator is at the outlet of combustion chamber, the large particles of the flue gas are separated, reduce the abrasion of heating surface.
D. The high temperature resistant material is deposited on the water cooling wall of the separator, avoiding the abrasion of membrane wall.

4. Various kinds of biomass fuels are adaptable.

The boiler could burn different coal and biomass fuels. The coal could be anthracite, bituminous and brown coal, lean coal, and combustible with coal gangue, gasifier slag, chain slag and other low-grade fuel, also, the slag can be used comprehensively, and the carbon content of the slag is generally below 2%. The biomass fuel could be wood, bagasse, paper products, bamboo, cotton shell, peanut shell, straw, sawdust, coconut shell, etc.

5. Low failure rate

The failure rate is extremely low, the boiler could run for a long time continually.

6. Environment Protection

The product uses low-temperature combustion technology, reduce the generation of noxious gas, also, the limestone can be added to the furnace for desulfuration, could meet the requirement of environmental protection.

High Quality Assurance


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.
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.

Rated Evaporation (t/h) Rated Steam Pressure
Rated Steam Temperature(℃) Feed Water Temperature
Coal Consumption (kg/h) Design Thermal Efficiency η Exhaust Gas Temperature (℃)
ZDG-20/3.8-M 20 3.8 450 105 2180 85% 165
ZDG-25/3.82-M 25 3.82 450 105 2860 85% 165
ZDG-30/3.82-M 30 3.82 450 105 4010 86% 150
ZDG-35/3.82-M 35 3.82 450 105 4176 85% 150
ZDG-40/3.82-M 40 3.82 450 105 5347 86% 150
ZDG-45/3.82-M 45 3.82 450 150 5611 85% 150
ZDG-75/3.82-M 75 3.82 450 150 8064 88.5% 135
ZDG-75/5.29-M 75 5.29 490 150 8064 88.5% 135
ZDG-130/3.82-M 130 3.82 450 150 13744 90% 140
ZDG-130/5.29-M 130 5.29 490 150 13744 90% 140
ZDG-220/9.8-M 220 9.8 540 150 23003 91% 140
Note: Parameter is for reference only, the specific should follow the design institution.

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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