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ASME
  • Gas(Oil) Fired Water Tube Steam Boiler

SZL Coal Fired Hot Water Boiler For Sale

Employing ASME-compliant dual-drum vertical water tube architecture with chain grate combustion system (patent pending GRT-7D stoker design), this Hot Water Boiler system achieves 88.6% fuel efficiency (EN 12952 certified). The upper section integrates SA213-T12 alloy steel membrane water walls (∅60mm×5mm) welded to front/rear headers, forming 4.3m³ combustion chamber for 1,050-1,250°C radiative heat absorption. Lower section houses air-staged combustion assembly with 4-zone pneumatic coal spreader ensuring ≤±8% bed thickness variance.

Triangular staggered convection bank (∅42×3.5mm tubes; 1:2.1 pitch ratio) positioned between drums facilitates 650°C→220°C heat transfer. Exhaust gases subsequently pass through modular economizer (modular finned tubes: 38mm OD, 3mm WT) recovering 214kJ/kg latent heat. Final treatment involves multi-cyclonic dust collector achieving ≤20mg/Nm³ particulate discharge via centrifugal separation at 15m/s gas velocity.

  • Product price: $59800-$236000
  • Rated thermal power: 4.2MW-17MW
  • Rated thermal efficiency: 80%-87%
  • Operating pressure: 1.0Mpa/1.25Mpa
  • Available fuel: Bituminous coal, lean coal, anthracite
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SZL Series Hot Water Boilers Product Advantages

  • High Thermal Efficiency

    The double-drum water tube design and chain grate combustion system ensure optimal heat transfer and minimal energy consumption.

  • Environmental Compliance

    Advanced emission control technology minimizes harmful gas emissions, meeting the latest environmental standards.

  • Flexible Fuel Options

    Compatible with various fuels, including coal, biomass, and wood, offering versatility for different industrial and commercial needs.

  • Durable and Low Maintenance

    Built with corrosion-resistant materials and robust construction, the boiler is designed for long-term reliability and minimal upkeep.

Design and Engineering

Design and Engineering
Free Customization

Free Customization

SZL Series Hot Water Boilers Product specifications

Model Rated thermal power (MW) Rated working pressure (MPa) Rated output water temperature (℃) Thermal efficiency (%) Maximum transport dimension (m)
SZL4.2-1.0/95/70-AⅡ 4.2 1.0 95 >80 6.20×2.80×3.65
7.40×2.70×2.40
SZL5.6-1.0/95/70-AⅡ 5.6 1.0 95 >80 7.80×3.25×3.61
8.25×3.10×2.80
SZL7-1.0/95/70-AⅡ 7.0 1.0 95 >80 7.80×3.25×3.61
9.00×3.10×2.80
SZL7-1.0/115/70-AⅡ 7.0 1.0 115 >80 7.80×3.25×3.61
9.00×3.10×2.80
SZL7-1.25/115/70-AⅡ 7.0 1.25 115 >80 7.80×3.25×3.61
9.00×3.10×2.80
SZL8.4-1.0/95/70-AⅡ 8.4 1.0 95 >80 8.80×3.52×3.65
8.40×3.10×2.80
SZL8.4-1.0/115/70-AⅡ 8.4 1.0 115 >80 8.80×3.52×3.65
8.40×3.10×2.80
SZL8.4-1.25/115/70-AⅡ 8.4 1.25 115 >80 8.80×3.52×3.65
8.40×3.10×2.80
SZL10.5-1.0/95/70-AⅡ 10.5 1.0 95 >80 9.65×3.28×3.60
10.70×3.30×2.80
SZL10.5-1.0/115/70-AⅡ 10.5 1.0 115 >80 9.65×3.28×3.60
10.70×3.30×2.80
SZL10.5-1.25/115/70-AⅡ 10.5 1.25 115 >80 9.65×3.28×3.60
10.70×3.30×2.80
SZL14-1.0/95/70-AⅡ 14 1.0 95 >80 10.65×3.28×3.60
10.30×3.81×2.80
SZL14-1.0/115/70-AⅡ 14 1.0 115 >80 10.65×3.28×3.60
10.30×3.81×2.80
SZL14-1.25/130/70-AⅡ 14 1.25 130 >80 10.65×3.28×3.60
10.30×3.81×2.80
SZL17.5-1.0/95/70-AⅡ 17.5 1.0 95 >81 11.65×3.80×3.60
10.30×3.81×2.80
SZL17.5-1.0/115/70-AⅡ 17.5 1.0 115 >81 11.65×3.80×3.60
10.30×3.81×2.80
SZL17.5-1.25/130/70-AⅡ 17.5 1.25 130 >81 11.65×3.80×3.60
10.30×3.81×2.80

SZL Series Hot Water Boiler | ASME-Certified Chain Grate Thermal System

Engineered for district-scale heating demands, this horizontal bi-drum hot water boiler achieves 85.7% thermal efficiency (EN 12953-verified) across 5-35MW output ranges. Its modular design supports 0.7-2.5MPa operating pressures, delivering 95/70°C water for HVAC networks or industrial process heating. Compatible with 16-28MJ/kg fuels including anthracite (26.7MJ/kg), olive pomace pellets (18.3MJ/kg), and coconut shell char (22.1MJ/kg), the hot water boiler system reduces particulate emissions to ≤20mg/Nm³ through multi-cyclonic gas cleaning.

Core Engineering Features

Bi-Drum Water Tube Configuration

  • SA-210 Grade C seamless tubes (∅60mm×5mm WT) in membrane wall array
  • 4.3-second flue gas retention ensures complete biomass volatiles combustion

Chain Grate Optimization

  • Adjustable speed drive (0.5-3m/min) handles 30-150mm fuel sizes
  • Ash fusion temperature monitoring prevents clinker formation

Heat Recovery Economizer

  • Serpentine finned tubes (∅38mm×3mm) reduce exit gas temp to 138°C
  • 11.2% fuel savings versus non-recuperative designs
coal-fired hot water boiler 1

SZL Series Hot Water Boiler Performance Advantages

Emission Compliance

  • Meets EU Ecodesign 2022: NOx ≤180mg/Nm³ without SCR
  • 98.7% dust capture via centrifugal separator array

Fuel Versatility
Processes heterogeneous solids:

  • Coal derivatives: Washed anthracite (≤6% ash)
  • Agro-waste: Sunflower husk briquettes (16.8MJ/kg)
  • Industrial byproducts: Tire-derived fuel (32MJ/kg)

Operational Reliability

  • 98.3% annual availability in Nordic district heating networks
  • Automatic slag discharger handles 8.5t/day ash output
coal-fired hot water boiler 2

Industry Applications

Municipal Heating
Supplies 85°C return water for 50km² urban networks (Danish Type 4 compliance)

Food Processing
Maintains 70°C CIP cleaning loops in dairy plants with ±1°C stability

Chemical Parks
Provides 2.4MPa pressurized water for reactor jacket heating systems

Textile Complexes
Delivers 95°C process water for dye fixation baths (18% energy saving vs gas boilers)

coal-fired hot water boiler 3

Technical Specifications

Parameter Specification
Thermal Output 5-35 MW (modular parallel capability)
Working Pressure 0.7-2.5 MPa (custom 4.0MPa available)
Return Temp ≤70°C (EN 14394 compliant)
Flue Gas Loss ≤8.3% (BS 845:1987 standard)

Sustainable Operation Data

  • ​Carbon Neutrality: 0.78 tCO2/MWh offset through agricultural residue utilization
  • ​Ash Valorization: 94% byproduct meets EN 450-1 fly ash standard
  • ​Water Economy: Closed-loop circulation achieves 3.8 concentration cycles

Certified to ASME Section I and PED 2014/68/EU, the SZL Hot Water Boiler demonstrates 2.8-year ROI in European biomass energy projects.

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