winter hot water boiler


  • Production capacity: 7-70 MW
  • Work pressure: 1.0-1.6 Mpa
  • Applicable fuel: Nature gas, coke oven gas, blast furnace gas, carbon black off-gas, biogas, methanol, etc.
  • Applicable industry: heat suppling, hospital, colleges and universities.

Product introduction

  SZS Series Boiler is double drums, longitudinal arranged, "D" type chamber structure. Furnace is on right side and convection tube bundle is on the left. The body is fixed on the basement by middle and both end flexible supports and make the boiler to expand horizontally to sideways. Around furnace is membrane water cooling tube wall. Furnace and tube bundle is totally separated by the membrane water tube cooling wall at the left side of the furnace. The back part of bundle is sparse shift structure, front part is aligned structure. Smoke from furnace outlet enters re-burning chamber, bundle area, and then from left front part enters spiral fin coil economizer and condenser, finally discharged to atmosphere through chimney.


  Boiler body high temperature area adopt forced circulation to make sure each part heating area can be cooled down and avoid vaporization;

  Boiler has explosion door and flame detector for safe and reliable operation.

  comb plates are used as the sealing between both sides of boiler and tube bundle all use to avoid leakage of condensate and gas which is caused by refractory concrete sealing.

  air tightness test is done before leaving the factory to ensure no leakage of gas.

environmental protection

  Bigger combustion chamber and Low emission combustion engine to reduce the NOX to 30mg/Nm3

  Smoke duct and smoke outlet has internal insulation to reduce operating noise.

  Combustion chamber use full membrane water cooling wall structure, pressurized firing without smoke mixture.

energy conservation

  Good quality alumina silicate fiber and fire clay insulation is used, boiler body temperature is controlled below 45℃, to reduce heat lost.

  Combustion chamber use narrow distance tube membrane water cooling wall which has good air tightness, and reduce heat lost and increase boiler thermal efficiency.

  Inside of Inspection holes use high-alumina refractory and man hole cover sealing devices, it solved the high temperature of this part by using refractory brick


  Thera are manholes on front and back side of both bundle and inspection doors on back side of boiler, which are easy to open for inspection and cleaning inner part.

longer lifespan

  Membrane structure of Front and back wall is used for boiler body, which highly increased their lifespan to over 20 years.

  The key part such as material cutting, rolling, drilling are proceeded by advanced CNC machining process to reduce the assemble stress and extend boiler working lifetime.

  flutter prevention fastener is used for high temperature part convection tube, which avoid bundle tube cracking problem.

  Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint will have 100% radiographic inspection.

SZS7-1.0/115/70-Q SZS10.5-1.0/115/70-Q SZS14-1.25/115/70-Q SZS17.5-1.25/115/70-Q SZS21-1.25/130/70-Q SZS29-1.25/130/70-Q SZS46-1.6/130/70-Q SZS58-1.6/130/70-Q SZS70-1.6/130/70-Q SZS116-1.6/130/70-Q
Rated thermal power(MW) 7.0 10.5 14.0 17.5 21.0 29 46 58 70 116
Rated working pressure(MPa) 1.0 1.0 1.25 1.25 1.25 1.25 1.6 1.6 1.6 1.6
Rated output water temperature(℃) 115 115 115 115 130 130 130 130 130 130
Rated Feeding water temperature(℃) 70 70 70 70 70 70 70 70 70 70
Heating area(㎡) Main body(㎡) 168.0 220.0 245.30 284.40 394.75 428.1 1065.9 1225.7 1408.4 6164.8
Condenser (㎡) 164.0 306.0 527.0 645.1 738.3 990.8 985.3 1292.5 1642.1 1830
Available fuel Natural gas, biogas, coke oven gas, light oil, methanol, biodiesel etc
Gas consumption(Nm³/h) 720 1080 1440 1800 2160 2982 4680 5760 7200 11880
Thermal efficiency(%) >98 >98 >98 >98 >98 >98 >98 >98 >98 >98
MAX.transportation weight(t) 42.0 48.0 52.5 57.5 65.0 72.5 散件12.6 散件13.8 散件16 散件20
MAX. transportation dimension LxWxH(m) 7.87x3.40x3.34 8.85x3.85x3.93 8.51x3.85x3.75 9.31x3.77x3.75 10.10x4.13x4.15 10.90x4.13x4.15 11.00xΦ1.45 11.10xΦ1.46 12.00xΦ1.66 12.50xΦ1.66


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