Coal/Biomass Fired Boiler

Estimated EXW reference prices vary by capacity and structural configuration (DZH, DZL, or SZL):

• Small packaged units (1–2 t/h / 0.7–1.4 MW):USD 8,000 – 25,000
• Standard chain-grate boilers (3–5 t/h / 2.1–3.5 MW):USD 25,000 – 55,000
• Medium industrial units (6–10 t/h / 4.2–7 MW):USD 55,000 – 110,000
• Large water-tube systems (>10 t/h / >7 MW): Starting from USD 110,000+

Quotes cover the boiler body and basic controls only (excluding freight). Final pricing depends on technical configuration, fuel feeding systems, and dust collection requirements.

Coal/biomass boilers are classified by fuel type (coal, wood pellets, briquettes, rice husks, or palm shells) and combustion design (manual firing or automatic chain grate).

The three standard industrial models are selected based on capacity and operating requirements:

• DZH Series (Single-Drum Water-Fire Tube / Manual or Fixed Grate):Compact design with lower initial cost, suitable for small-capacity or intermittent operation (<2 t/h).
• DZL Series (Horizontal Package / Automatic Chain Grate):Water-fire tube hybrid design with reliable operation and easy installation, suitable for small-to-medium continuous steam demands (2–10 t/h).
• SZL Series (Double-Drum Water-Tube / Heavy Chain Grate):Water-tube structure designed for medium-to-large capacity applications, especially where higher pressure and continuous operation are required.

Common auxiliary equipment includes bucket elevators, fuel conveyors, chain grate drive systems, forced draft (FD) and induced draft (ID) fans, scraper and screw ash discharge systems, economizers, high-pressure feedwater pumps, deaerators (for higher-pressure systems), and pulse-jet baghouse dust collectors.

SNCR/SCR denitrification systems can also be integrated to meet strict local emission regulations.

Coal/biomass boilers offer low fuel costs and wide fuel flexibility, making them suitable for coal, biomass pellets, sawdust, rice husks, and various agricultural and forestry residues.

Biomass fuels may qualify for renewable energy incentives, carbon credits, or local tax benefits depending on regional policies and carbon accounting frameworks.

Standard DZH, DZL, and SZL boilers typically require 35–50 days.

Large-capacity SZL boilers and projects including baghouse dust collection systems generally require 60–90 days.

Final lead time depends on boiler specifications and project scope.

Key operating points include maintaining proper water levels, preventing fuel backfire and slagging, and keeping the furnace under slight negative pressure according to boiler design requirements.

Regular soot blowing helps maintain heat transfer efficiency.

Avoid prolonged positive-pressure operation to prevent furnace door damage, flue gas leakage, and safety risks.

Coal and biomass fuels have different characteristics in terms of energy value, storage, and operating requirements.

Coal fuel:

– Higher calorific value and more stable combustion characteristics

– Easier long-term storage with lower moisture variation

– Suitable for applications requiring continuous high-load operation

Biomass fuel:

– Renewable fuel option with lower net carbon impact when sustainably sourced

– Widely available in agricultural and forestry regions

– Requires proper fuel feeding and combustion control due to higher moisture and variable fuel properties

For plants with unstable fuel supply or seasonal price changes, dual-fuel boilers can provide additional flexibility by allowing operators to switch between coal and biomass fuels.

Many compatible coal chain grate boilers can be converted to biomass firing after technical evaluation.

Typical upgrades include specialized biomass feeding systems, secondary air optimization for high volatile fuels, and enhanced baghouse dust collection.