SZL Biomass-Fired Hot Water Boiler

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  SZL series boiler is the horizontal dual cylinder arranged,chain grating,pipe steam and hot water boiler designed by our technical personnel according to advanced technology and experiences from home and abroad.The technology performance and environmental protective index of this series of products reach the international advanced level,and this product is the mainstay one in boiler industry.

  The boiler uses quick fitting or assembly structure.The 4-6 t/h boiler is of quick fitting pipe structure,exit shop after completely assembled,the boiler of 6-35 t/h is composed of 2 main components: The upper assembled components is the body heat accepting part, and the lower assembled component is of combustion equipment. The former part of the boiler body is arranged an water cooling wall,the upper part of it is connected to boiler cylinder, and its lower part is connected to collective chest,so as to form a combustion room and absorb the radiated heat from the furnace;its rear part is arranged with dense convection pipe bundle between upper and lower boiler cylinders; the high temperature smog after combustion shall stand for twice returning flushing transversely to the heat accepting surfaces, and shall be introduced to coal saver singly arranged,and flow into duster and exhausted from chimney in the end.The 20 t/h assembled water pipe boiler is composed of front furnace, rear furnace, convection pipe bundle,coal saver and chain grating,and which are assembled in big components respectively for delivery.

  This series of boiler absorbs the merits from quick fitting boiler, features compact in structure,the boiler's shop is of one storey arranged,convenient for site installation,short in construction period, cheap in cost, simple in operation and etc.This series of steam boiler is suitable for isustrial and living steam consumption,the correspondent capacity hot water boiler is applied for industrial and civil heating purpose.

  • Parameter
  • Characteristics
  • System flow chart
  • Related Case

Rated thermal power(MW) 4.2 5.6 7.0 14 21
Rated working pressure(MPa) 1.0 1.0/ 1.25 1.0/ 1.25 1.0/ 1.25 1.0/ 1.25
Rated output water temperature(℃) 115 115/130 115/130 115/130 115/130
Return water temperature(℃) 70 70 70 70 70
Biomass Biomass particle fuel
Low heating value(KJ/kg) 16240
Fuel consumption(kg/h) 1122 1488 1860 3600 4340
Thermal efficiency(%) 82.8 83.2 83.2 85.8 86.0


CNC manufacturing technology
  • The key processing technologies such as steel plate blanking, circling, drilling of drum and pipe plate are all adopt advanced CNC processing to reduce the assembly stress and prolong the service life of the boiler.
  • Steel pipe cutting, thread pipe pressing and convection pipe processing adopt advanced CNC process.
  • Automatic production line.
  • CNC manufacturing technology


    Advanced welding process
  • The welding of important parts like the vertical and circular seams of the boiler, the pipes, the inside of boiler and the flange are all adopted automated welding processes such as submerged arc welding or gas shielded welding to ensure the welding quality. All the vertical and circular seams will be done 100% radiographic inspection.
  • Tube flange weld adopts robot welding.
  • The chain grate panel, front and rear smoke chamber panel adopts CNC plasma cutting machine to cut orderly and beautifully.
  • Advanced welding process


    Unique structural design
  • According to different capacity, different numbers of independent wind bins are set from front to back of the grate.
  • The user can reasonably distribute the air according to different combustion conditions to ensure that the fuel is fully burned.
  • Intake air secondary, disturb fuel gas in the furnace, to ensure the fuel fired totally. The independent secondary draft fan make it easy to control and adjust the wind and wind pressure.
  • The spreader feeds evenly to prevent tempering.
  • Unique structural design


    Low NOx emissions
  • Graded air supply and special furnace arch structure make the NOx emissions down to 100mg/m³.
  • We have taken numerical simulations on different biomasses, we find the thermal efficiency is more than 90%.
  • Low NOx emissions


    Spring full lift safety valve
  • The safety valve discharge capacity is calculated strickly.
  • When the system pressure exceed rated value,safety value will open decompression automatically to make sure that no accident will occur because of high system pressure.
  • Spring full lift safety valve


    Overhaul platform
  • Overhaul platform is safe and reliable,arranged reasonably and overhauled conveniently.
  • Platform ladder will be fixed by bolt and nut.
  • Safe and convenient and primer will not be damaged.
  • Overhaul platform



    SZL Biomass-Fired Hot Water Boiler-System flow chart

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