DZL Biomass-Fired Steam Boiler

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  DZL New type water tube boiler is co-produced by Wuxi Zozen Boilers Co,Ltd and Beijing Zhiguang Boiler Research Institute based on full aspects of technical cooperation. The technology of new type water tube boiler of Beijing Zhiguang Boiler Research Institute is adopted and Professor Li Zhiguang is invited to hold technology Supervision.

  DZL New type water tube boiler integrates all advantages of water and fireboiler in home and abroad. As the industrial boilers in China covers wide fields of big quantity with a behindhand technology,thus,this new type is a new generation product and a scientific fruit of domestic colleges and research institutes.It features in high technology content,which is lo items of new technology increased comparing with current industrial boiler,therefore,it intensify the burning and heat conducting Water cycling is safe and reliable with enough output force and high efficiency.The output force and efficiency will not change in the whole operation life time.New type indicates that there is no reported boiler type in home and abroad.It has good environment protection and energy conservation effect;It has great economic and social benefits.

  • Parameter
  • Characteristics
  • System flow chart
  • Related Case


Rated thermal power(t/h/MW) 1/0.7 2/1.4 4/2.8 6/4.2
Rated working pressure(MPa) 0.7/1.0/ 1.0/1.25/1.57/2.45 1.25/1.57/2.45 1.25/1.6
Steam temperature/Rated output water temperature(℃) 170/184 184/194/204/225 914/204/225 194/205
Heating area(㎡) Body 32.4 46.0 106.89 126.7
Economizer(㎡) 12.51 35.2 38.5 78.5
Effective area of grate(㎡) 2.05 3.70 5.30 8.32
Available fuel
Biomass                            Biomass granule
Low heating value(KJ/kg) 16400
Fuel consumption(kg/h) 196 392 784 1176
Thermal efficiency(%) 79.00 79.00 79.00 79.00
Weight of biggest part for transportation(t)
13 22 30 23
Overall dimension of boiler assembled LxWxH(m) 5.2x2.0x2.9 5.7x2.5x3.5 6.6x2.6x3.6 7.3x3.2x3.6
Overall dimension of boiler assembled LxWxh(m)
6.0x3.5x4.1 6.0x3.9x5.0 7.2x4.0x4.9 8.0x5.1x6.0


CNC manufacturing technology:
  • The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced numerical control processing to reduce the assembly stress and prolong the service life of the boiler.
  • Steel pipe cutting, thread pipe pressing and convection pipe processing all adopt advanced numerical control technology.
  • The use of arched tube sheets and threaded fire tube was first adopted in China to increase heat transfer and completely solve the problem of cracking of the rear tube sheet.
  • The layout of chain grate is neat and beautiful, result in front and rear smoke box panel using CNC plasma cutting machine.
  • CNC manufacturing technology:


    Advanced welding process
  • The vertical and circumferential seam welding of the boiler adopts advanced automatic submerged arc welding technology to ensure the welding quality. All vertical and circumferential welds are subjected to 100% ray detection.
  • The welding of smoke pipe and the tube plate adopts pre-expansion to eliminate the gap between the tube and tube plate, then be welded by automatic argon arc. Which effectively eliminate stress and prolong boiler life.
  • The flange of the socket is welded by robots.
  • The chain grate is manufactured by our factory, and it is tested for 72 hours before leaving the factory to ensure that the tightness is moderate and won’t go wrong.
  • Advanced welding process


    Precision parts processing
  • Advanced manufacturing technology, using assembly line automatic spinning operation.
  • Enhance heat transfer and raise boiler thermal efficiency.
  • Threaded fire pipes are highly efficient heat transfer elements for many years of research by our company. After continuous optimization, the heat transfer coefficient is 1.8 times higher than that of conventional fire pipes when the selection of thread groove depth and pitch.
  • Precision parts processing


    Unique structural design
  • Disturbed flue gas to ensure complete combustion of volatiles.
  • The air volume accounts for about 30% of the total, and the wind speed is about 50m³.
  • The independent secondary draft fan makes it easy to control and adjust the wind volume and pressure.
  • The high-temperature smoke generated by the combustion first enters the eight-character flue on both sides of the body from the tail (in this case, the water pipe type), and the flue gas flows outside the pipe.
  • The flue gas cooled by the eight-character flue then enters the threaded tube (in this case the fire tube type) arranged in the drum from the front smoke box.
  • The flue gas will be exhausted from the rear smoke box finally, this design fundamentally solves the problem of cracking of the tube sheet of a pure fire tube boiler.
  • Unique structural design


    Cold rolling pressed film concave-convex panel has great strength and is beautiful.Panel


    Extreme low water electrode
    Prevent boiler water shortage caused by extreme low water being operated in manual mode and reinforce the safety protectioon of water level control.Extreme low water electrode



    DZL Biomass-Fired Steam Boiler-System flow chart

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