SZL Series Hot Water Boiler

SZL Series Hot Water Boiler

SZL series double-drum vertical chain furnace drainage tube hot water boiler adopts quick-installation or assembly structure.

  • Rated thermal power : 2.8 - 29 MW
  • Rated thermal efficiency : ≥88%
  • Rated pressure: ≤ 1.25MPa
  • introduction
  • Technical parameters
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SZL series double-drum vertical chain type water tube hot water boiler is designed with a quick-installation or assembly structure. The boiler is composed of upper and lower parts, where the upper part is the heating surface of the body and the lower part is the combustion equipment. The front end of the boiler body is a water-cooled wall arranged around, with the upper part connected to the drum and the lower part connected to the header to form a combustion chamber that absorbs the radiant heat of the furnace. The high-temperature flue gas is led to the separately arranged economizer after being horizontally scoured on the convective heating surface by the secondary return, and finally enters the dust collector and is discharged through the chimney.


  • Wide fuel adaptability: The boiler is applicable to various fuels, including bituminous coal, lean coal, anthracite, rice husk, wood chips, corncobs, and more.

  • Full combustion of fuel: The design of the chain grate and independent air chamber ensures complete fuel combustion.

  • Thermal efficiency ≥ 88%: The furnace features a water-cooled wall tube structure arranged in close proximity, resulting in a large radiation area that enhances thermal efficiency.

  • Easy to operate: The advanced control system offers a high degree of automation for fuel supply, ash discharge, and slag discharge.

  • Spring full lift safety valve: The safety valve is strictly calculated to ensure safe operation. When the system pressure exceeds the specified value, the safety valve automatically opens to release the pressure.

  • Maintenance platform: The platform escalator is bolted and nutted, ensuring safety and reliability.

  • Reasonable layout, convenient installation, and maintenance: The boiler is designed with manholes, inspection doors, and an inspection door in the furnace for easy access during maintenance and cleaning.

  • Feeder, speed control box: The spreader feeds the material evenly and prevents tempering, while the speed control box is designed with a reasonable speed according to the combustion rate of fuels.

  • Chain grate: The layer combustion method is adopted, and the fuel has wide adaptability. The grate bracket features double-layer brackets that prevent deviation or sticking.

  • Panels: The cold-rolled die forming ensures good rigidity and light weight, while the surface is coated with primer and topcoat for effective anti-corrosion.

  • Independent air warehouses: Different numbers of independent air bins are set according to the tonnage of the boiler. The air distribution can be adjusted according to combustion conditions to ensure full combustion of fuel.

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Technical parameters of SZL series hot water boiler(coal/biomass)

Model Rated thermal power(MW) Pressure(MPa) Rated water temperature(℃) Return water temperature (℃) Max transportation dimension(m) (LxWxH)
SZL2.8-0.7/95/70-SCII 2.8 0.7 95 70 7.4x2.7x5.3
SZL4.2-1.0/115/70-SCII 4.2 1 115 70 7.0×2.7×3.5
SZL5.6-1.0/115/70-SCII 5.6 1.0 115 70 6.9×3.2×3.5
SZL5.6-1.25/130/70-SCII 5.6 1.25 130 70 6.9×3.2×3.5
SZL7.0-1.0/115/70-SCII 7 1.0 115 70 7.9×3.3×3.5
SZL7.0-1.25/130/70-SCII 7 1.25 130 70 7.9×3.3×3.5
SZL14-1.0/115/70-SCII 14 1.0 115 70 11×3.2×3.5
SZL14-1.25/130/70-SCII 14 1.25 130 70 11×3.2×3.5
SZL21-1.0/115/70-SCII 21 1.0 115 70 9.9×3.3×3.6
SZL21-1.25/130/70-SCII 21 1.25 130 70 9.9×3.3×3.6
SZL29-1.0/115/70-SCII 29 1.0 115 70 8.0x3.8x3.8
SZL29-1.25/130/70-SCII 29 1.25 130 70 8.0x3.8x3.8

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Integrating R&D, production, distribution, and service-providing into one enterprise, EVERED attaches great importance to communication with customers. We have established an after sales visit team consisting of more than 56 persons. On the one hand, they timely solve the problems that our customers encounter; on the other hand, they collect feedback and improvement recommendations from our customers, to correctly orient our development and research.

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