Gas/Oil Fired Boiler

Estimated EXW reference prices vary by capacity and structural configuration:

• Small packaged units (1–2 t/h / 0.7–1.4 MW):USD 12,000 – 22,000
• Standard horizontal boilers (3–5 t/h / 2.1–3.5 MW):USD 22,000 – 50,000
• Medium industrial units (6–10 t/h / 4.2–7 MW):USD 50,000 – 95,000
• Large systems (>10 t/h / >7 MW):Starting from USD 95,000+

Final pricing depends on pressure rating, burner configuration, emission requirements, and auxiliary equipment.

Standard quotations usually cover the boiler body and control panel only, excluding freight and port charges. Skid-mounted packages, turnkey systems, and final pricing are confirmed after technical drawing review.

A gas/oil boiler system mainly consists of the boiler body (combustion furnace and fire tubes), an integrated monoblock burner, electrical control panel, feedwater treatment system, and safety devices.

Safety devices include safety valves, dual-color level gauges, pressure controllers, and explosion doors where applicable.

Main auxiliary equipment depends on the boiler type and application.

For gas/oil steam boilers, common auxiliaries include:Monoblock burner with blower, servomotor, and fuel valve train;Feedwater pumps;Water softening or RO systems;Condensing economizers;Steam headers (when required by the steam distribution system).

For oil-fired models, additional equipment include:Gas pressure regulating trains;Daily service oil tanks and oil supply systems.

The final auxiliary configuration depends on fuel type, boiler capacity, operating conditions, and project requirements.

Gas/oil boilers are commonly classified by fuel type, structural design, and output medium.

Fuel type: Natural gas, LPG, biogas, diesel, and heavy oil.

Structural design: Vertical once-through boilers or horizontal three-pass wet-back WNS boilers.

Output medium: Saturated steam, superheated steam, or hot water.

Gas/oil boilers provide clean operation, high efficiency, fast response, and automatic control.

Key advantages include:Low emissions with minimal dust and SO₂;Low-NOx models can achieve emissions below 30 mg/m³ under specific test conditions;High thermal efficiency, with condensing systems reaching up to 100.9% efficiency based on LHV calculation;Fast steam generation during cold start;Automatic operation with one-touch start/stop and load modulation;No manual fuel feeding or ash removal system required.

Standard horizontal WNS boilers usually require 20–35 days for manufacturing.

Customized configurations, including low-NOx FGR systems, high-pressure designs, or skid-mounted packages, normally require 40–60 days.

Lead time includes fabrication and hydrostatic pressure testing.

Key safety points include preventing fuel leakage, avoiding dry firing, and maintaining proper water treatment.

Important measures include:Checking fuel supply systems regularly for leakage;Ensuring proper water level and feedwater quality;Performing routine blowdown to control water quality;Running the pre-purge cycle before ignition to prevent furnace explosions;Preventing scaling, overheating, and tube damage through proper water treatment.

Natural gas contains almost no ash and sulfur. When combined with low-NOx burners, gas boilers can meet many emission requirements without additional equipment such as flue gas desulfurization (FGD), selective catalytic reduction (SCR), or baghouse dust collectors.

This helps reduce initial investment in emission control systems.

Natural gas has an IPCC emission factor of 56.1 kg CO₂/GJ, which is typically lower than coal depending on fuel quality and combustion conditions.

Using natural gas can help reduce carbon emissions and lower potential carbon-related operating costs.

Dual-fuel boilers can automatically switch between gas and oil operation to maintain production continuity when fuel supply changes.

In some regions, cleaner fuel technologies may benefit from simpler approval procedures or available environmental incentives. Specific policies depend on local regulations.

Emergency operation usually uses Ultra-Low Sulfur Diesel (ULSD, sulfur content below 15 ppm).

Low-sulfur fuel helps reduce SOx emissions, while staged-combustion burners help control NOx emissions and meet applicable local emission requirements.