SZL Series Chain Grate Boiler

Water tube boilers are designed for larger, high-pressure, and superheated steam applications. SZL series coal fired chain grate boiler is a good example. Membrane water cooling wall structure in combustion chamber, good sealing to prevent heat loss. It is widely used in textile factory, paper factory, food industry, generating steam in industry process. SZS series water tube boilers were sold to Iran, Mongolia and Vietnam.

SZL Series Chain Grate Boiler

    6-25 t/4.2-17.5MW

  • Pressure


  • Fuel

    Bituminous Coal, Lignite Coal

  • Application

    Food Industry, Heating Supply

DZL chain grate boiler1.jpg

Lower fuel costs

More combustion heat was being transferred into the boiler water. Combustion chamber airtightness and thermal conductivity directly influence thermal efficiency as well as boiler economical benefits. Because each 40°F reduction in the boiler flue gas temperature results in a 1% boiler-efficiency improvement. Fuel costs have decreased by approximately 4%.

Available to burn low grade fuel

a. Longer Fuel Combustion Period. Front arch is higher and shorter than rear arch, 45° angle between the two arches, which can extend the time of flue gas combustion time, and enhance thermal transferring efficiency.

b. It can burn low calorific value coal such as brown coal, lean coal, and flue coal.

DZL chain grate boiler2.jpg
DZL chain grate boiler3.jpg

The overload ability strengthened

The length of the front and back shaft is longer than the other ones, which prolongs the time of fuel combustion in the furnace and lower the carbon content in the furnace slag. Thus, the overload ability of the boiler is strengthened with the increased effect area of furnace grate.

Burning effect is good

Wind is feed from both sides of the boiler. There are six independent air chambers, each of them has independent air adjustment device which can respectively adjust the air volume so as to achieve the best combustion effect.

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SZL Series Coal Steam Boiler
Model Rated Steam Capacity Rated Steam Pressure
Rated Steam Temperature
Rated Water Temperature
Fuel Type
t/h BHP
SZL4-2.5-AII 4 306 25 226 20 Biomass fuel,
Bituminous coal, 
Anthracite coal
SZL6-1.25-WIII 6 460 12.5 194 20
SZL8-1.25-AII 8 613 12.5 194 20
SZL10-1.25-AII 10 766 12.5 194 20
SZL12-1.25-AII 12 919.2 12.5 194 20
SZL15-1.25-AII 15 1149 12.5 194 105
SZL20-1.25-AII 20 1532 12.5 194 105
SZL25-1.25-AII 25 1915 12.5 194 105
SZL30-1.25-WIII 30 2298 12.5 194 105
SZL30-2.5-AII 30 2298 25 226 105
SZL Coal Hot Water Boiler
Model Thermal power Outlet Water Pressure
Outlet Water Temperature
Raturn Water Temperature
Fuel Type
SZL7-1.0/95/70-AII 7 714 10 95 70 Biomass fuel,Bituminous coal, Anthracite coa
SZL7-1.0/115/70-AII 7 714 10 115 70
SZL14-1.0/95/70-AII 14 1428 10 95 70
SZL14-1.25/115/70-AII 14 1428 12.5 115 70
SZL14-1.25/115/70-AIII 14 1428 12.5 115 70
SZL17.5-1.25/115/70-AII 17.5 1785 12.5 115 70

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