Coal Gasifier
Coal Gasifier
May 11, 2026
Coal Gasifier
A coal gasifier converts various types of coal into clean synthesis gas — a proven solution for coal compliance and high-efficiency utilization.Coal remains the backbone of global power generation, yet tightening emission regulations and carbon pressures are making direct coal combustion increasingly unsustainable.If you control coal resources and need a cleaner, more compliant, and more cost-effective alternative to direct burning — now is the time to invest in a Coalwatt gasification system.
What Is Coal Gasification？ — Fuel Conversion Process
Coal gasification is a thermochemical conversion process, typically carried out in a coal gasifier. Here's how it works: at high temperatures, coal reacts with controlled amounts of oxygen and steam, transforming this solid fuel into a combustible gas mixture known as synthesis gas, or syngas.
The fuel conversion process is as follows:
The fuel conversion process is as follows:
Raw Material： Coal
Coal is the most abundant fossil fuel on Earth. It remains the backbone of global power generation. Common coal types suitable for gasification include:
Anthracite: The highest-rank coal, with high fixed carbon and very low volatile matter. Produces clean, high-calorific-value syngas.
Bituminous Coal: A medium-rank coal with a balanced ratio of fixed carbon to volatile matter. It is the most widely used feedstock in industrial gasification.
Lignite: A lower-rank coal with higher moisture and volatile content. Economical for mine-mouth gasification projects.
The Gasification Process
Coal gasification achieves fuel conversion through two essential core conditions:
Condition 1: High Temperature. When temperatures exceed 700°C, volatile compounds in coal are released, and the carbon skeleton is exposed for the reactions that follow.
Condition 2: Controlled Oxidant and Steam Supply. A measured amount of air or oxygen is introduced — just enough to sustain the reaction, but not enough to burn the coal completely. Steam is added to promote the conversion of carbon and water into hydrogen and carbon monoxide.
The result: a fuel gas that is cleaner than raw coal combustion. Sulfur and other impurities can be removed before the gas is burned.
End Product： Syngas
Syngas is the combustible gas mixture produced by coal gasification. Its main components are carbon monoxide (CO) and hydrogen (H₂), with smaller amounts of methane (CH₄). Syngas offers two key advantages over raw coal:
Cleaner Combustion: Sulfur, particulates, and other impurities are removed in the gas phase — before the fuel enters an engine or boiler.
Multi-Purpose Utilization: Syngas can be burned for power generation, used as industrial fuel for kilns and boilers, or serve as a chemical feedstock for producing methanol, ammonia, and hydrogen.
Powermax Coal Gasification Technology — Engineered for Power Plant Reliability
Emissions Meet International Standards
Powermax downdraft fixed-bed gasifiers comply with EU and international emission standards. The high-temperature self-cracking design achieves near-zero phenolic wastewater discharge. Projects gain faster environmental approval.
Syngas Quality Verified by Power Plant Performance
Tar content ≤20mg/Nm³ after purification — validated across multiple operating plants. Low-speed 600 rpm generator sets, purpose-built for syngas, exceed 20 years of service life in continuous 24/7 operation.
Technology Proven Across Global Projects
From South Africa to Southeast Asia, Powermax plants operate under diverse coals, climates, and load profiles — providing investors with confidence in technology maturity and project bankability.
CoalWatt Series: Modular, Rapid-Deployment Gasification Power Plant
500 kW | 1 MW | 2 MW
power range
power range
≤ 1 Month
on-site deployment
on-site deployment
20+ Years
generator lifespan
generator lifespan
Near Zero
wastewater discharge
wastewater discharge
Syngas Purification System — Clean Gas from Source to Engine
Our downdraft design thermally cracks tar at its source in the high-temperature zone (1,000–1,200°C), eliminating phenolic wastewater entirely. Downstream, dual-stage electrostatic precipitators (ESP) with cyclone pre-filters remove residual tar aerosols and particulates.
Tar cracked at source — ≤0.5% in gas stream, protecting downstream engines
Near-zero phenolic wastewater — no secondary pollution
Dual ESP + cyclone pre-filters — tar aerosols ≤20mg/Nm³
Seasonal gas cooler adapts to ambient temperature, field-proven in South Africa
Clean, dry gas extends engine life beyond 20 years
Low-Speed Generator Set — Purpose-Built for Syngas
Standard 1,500 rpm gas engines are not designed for low-calorific-value syngas. Our 600 rpm units are engineered specifically for this fuel.
600 rpm design enables 20+ year service life — double that of converted high-speed engines
Optimized for syngas (≥1,200 Kcal/Nm³), not a modified natural gas engine
Stable combustion under fluctuating gas quality
Lower total cost of ownership through reduced wear and maintenance
Rapid Deployment & Intelligent Automation
Factory pre-assembled, containerized modules replace months of on-site construction. Siemens-based PLC control reduces reliance on specialized operators — critical for remote industrial sites.
On-site work limited to positioning, interconnecting, and commissioning — ≤ 1 month
No heavy civil works — only a level reinforced concrete pad required
Plug-and-play expansion: start at 500 kW and scale to 1 MW or 2 MW
One-click start/stop with multi-language graphical interface
Pre-diagnosis alarm system identifies faults before they escalate
Optional cloud-based remote monitoring for multi-site operations
One-stop turnkey delivery under one contract, one warranty
CoalWatt Series: Modular Coal Gasification Power Plant
Single-Stage Gasifier — SS Series Optimized for anthracite and coke.
Maximum efficiency from high-grade coal.
500 kW | 1000 kW | 2000 kW power range
1250–1450 Kcal/Nm³ net heating value
3 Configurations to match your site
Double-Fire Gasifier — DF Series Engineered for lower-grade coals.
Accepts lignite, brown coal, long flame coal, and bituminous varieties.
500 kW | 1000 kW | 2000 kW power range
5000–6000 KJ/Nm³ net heating value
3 Configurations to match your site
Successful Project Delivery: Coal Gasification Projects Worldwide
Coal-to-Syngas Project for Ceramic Kiln Heating — Vietnam
Background:
A major tile manufacturer in Vietnam relied on imported fuels for its kiln heating, facing rising costs and supply chain volatility. The company sought a stable, cost-controllable energy source that could maintain the strict temperature profiles required for high-quality tile production. Powermax was selected to provide a coal gasification solution that would convert locally sourced coal into clean syngas, directly replacing the customer's dependence on volatile fuel markets.
Project Information
Item：Detail
Project Location：Vietnam
Raw Material：Coal
Capacity：8,000 Nm³/h Syngas
Industry：Tile Kiln Heating
Solution：Coal gasifier + syngas purification+ automated control system
Project Achievements
Production Continuity: Reliable, stable, and controllable thermal energy supply replaced imported fuels, eliminating production stoppages caused by fuel shortages.
Process Controllability: Precise temperature control enabled by clean syngas combustion improved tile quality consistency.
Cost Certainty: Switched from volatile imported fuel prices to locally sourced coal, significantly reducing energy cost per square meter of tile produced.
2 MW Double-Fire Coal Gasification Power Plant — China
Background:
An industrial facility in China required a reliable on-site power generation solution to reduce dependence on grid electricity. With access to locally available low-grade coal, the customer needed a gasification system that could handle lower-quality feedstock without sacrificing power output. Powermax deployed a Double-Fire (DF) gasifier, specifically engineered to accept a wide range of coal types, including lower-grade varieties that single-stage gasifiers cannot process.
Project Information
Item：Detail
Project Location：China
Rated Power：2 MW
Gasifier Type ：Double-Fire (DF Series)
Raw Material ： Low-grade coal
Project Achievements
Fuel Flexibility: DF gasifier successfully processed low-grade coal that single-stage alternatives could not use, reducing fuel procurement costs.
Grid Independence: On-site power generation reduced reliance on grid electricity, providing energy security for continuous industrial operations.
Proven DF Technology: This project validated the Double-Fire design for lower-grade coal applications, paving the way for similar projects worldwide.
Coal Gasification Projects Spread Worldwide
Gasification Power Plant — Kenya
Raw Material: Coal
Capacity: 2 × 3.6m Gasifier ≈ 10 MW
Application: Off-grid power generation
Key Benefit: Reliable power in grid-limited region
Multi-Country Deployment — Southeast Asia
Indonesia & Philippines: Off-grid/microgrid solutions for industrial parks and mines, replacing high-cost diesel generation with coal gasification.
Vietnam & Myanmar: Modular, rapidly deployable distributed power stations for manufacturing plants and emerging towns, with surplus power grid connection models creating additional revenue.
Available Feedstocks for Coal Gasification
Anthracite and Coke
High-grade, low-volatility coals. Maximum heating value and cleanest syngas output.
Bituminous and Sub-bituminous Coals
Bituminous coal, Lean coal, Gas coal, Long flame coal
Medium-grade coals. Broad availability, balanced performance.
Lignite, Brown Coal, and Low-Grade Coals
Lignite, Brown coal, High-sulfur coal, High-ash coal
Low-grade coals. Higher moisture and ash content, requiring gasifiers with wider feedstock tolerance.
Suitable coal feedstock should follow the following criteria:
Appropriate particle size:
Coal size should be 13–25 mm or 25–50 mm depending on gasifier type. Oversized coal can jam the feed system, while overly fine coal increases dust and reduces gas permeability.
Sufficient heating value:
Net heating value (low) should be ≥ 5,200 KJ/Nm³ for single-stage gasifiers and ≥ 5,000 KJ/Nm³ for double-fire gasifiers. Lower heating value coal can still be processed, but gas output per ton will decrease proportionally.
Sufficient heating value:
Net heating value (low) should be ≥ 5,200 KJ/Nm³ for single-stage gasifiers and ≥ 5,000 KJ/Nm³ for double-fire gasifiers. Lower heating value coal can still be processed, but gas output per ton will decrease proportionally.
Applications of Syngas from Coal Gasification
Syngas for Power Generation
Baseload Electricity
Clean syngas fuels high-efficiency gas engine generator sets to produce stable, 24/7 electricity.
Unlike solar or wind, coal gasification power generation delivers on-demand baseload power — independent of weather, season, or time of day.
For industrial operators and remote communities, this means energy independence and significantly lower electricity costs compared to diesel generation.
Applications:
Ideal for industrial parks, mining operations, remote communities, and any facility requiring reliable off-grid or grid-parallel power.
Sygas for Industrial Kiln and Boiler Heating
Process Heat
Sygas directly replaces coal combustion or imported fuels for heating ceramic kilns, chemical reactors, metallurgical furnaces, and industrial boilers.
Combustion temperature is controllable and stable, meeting the strict thermal profiles required for high-quality tile, magnesium, aluminum, and chemical production.
The result: higher product yield, lower defect rates, and production cost certainty — no longer exposed to volatile imported fuel markets.
Applications: Proven across ceramic manufacturing, magnesium and aluminum processing, and chemical product heating.
Syngas for Combined Heat and Power (CHP)
Total Energy Utilization
Waste heat recovered from engine exhaust and cooling systems produces steam or hot water for industrial processes, space heating, or feedstock drying. Total system efficiency exceeds 74%, significantly outperforming standalone power generation or standalone combustion. For factories with simultaneous power and heat demand, CHP reduces total energy cost by utilizing a single fuel source for two outputs.
Applications: Suitable for factories, mines, and industrial sites with simultaneous power and heat demand.
Sygas for Methanol Production
Methanol Synthesis Feedstock
Purified syngas — a mixture of CO and H₂ — serves as the primary feedstock for methanol synthesis.
Methanol is a platform chemical used across fuel, solvent, and olefin production value chains.
For coal-rich regions, coal-to-methanol via gasification offers a lower-cost production route compared to imported methanol or natural gas-based alternatives.
Syngas-to-Hydrogen:
Your Independent H₂ Supply
Convert on-site syngas into a captive, investment-grade hydrogen stream. By routing syngas through a water-gas shift (WGS) reactor, we maximize hydrogen yield before extracting ultra-high-purity H₂ via Pressure Swing Adsorption (PSA).
For ammonia producers and refineries, this means cutting the cord from delivered hydrogen. You eliminate recurring transportation costs, remove the operational risk of supply disruptions, and gain complete control over a critical feedstock—insulating your production from volatile third-party markets.
Syngas for Ammonia and Urea Production
Fertilizer Feedstock
Hydrogen from syngas combined with nitrogen produces ammonia, the foundational input for nitrogen fertilizers. In regions with abundant coal but limited access to natural gas, coal-to-ammonia via gasification provides a domestic fertilizer supply chain — reducing dependence on imported fertilizers and stabilizing agricultural input costs.
Not sure which application matches your project requirements?
Tell us your target output — electricity, process heat, methanol, or hydrogen — our engineers will recommend the optimal system configuration within 24 hours.
Economic Feasibility of Coal Gasification Power Plant Investment
Investing in a coal gasification power plant offers compelling financial returns. Key factors influencing profitability include coal costs, electricity prices, system efficiency, and waste heat utilization. Customers can benefit from:
Revenue from Electricity Sales
A coal gasification power plant generates baseload electricity 24/7, suitable for self-consumption or grid sales.
With coal costs significantly lower than diesel or natural gas per unit of energy, the cost per kWh can be reduced to 0.04 – 0.04–0.09 — a fraction of the 0.30 – 0.30–0.45 typical of diesel generation.This provides a stable, long-term revenue stream.
Revenue from Process Heat (CHP)
Waste heat recovered from engine exhaust and cooling systems produces steam or hot water for industrial processes, space heating, or feedstock drying.
Total system efficiency exceeds 74%, generating additional value from the same fuel input without additional fuel cost.
Savings on Diesel and Grid Electricity Costs
For industrial sites relying on diesel generators or unstable grid power, coal gasification provides a lower-cost alternative at 0.04 – 0.04–0.09 per kWh versus 0.30 – 0.30–0.45 per kWh for diesel. This reduces operating expenses and protects against diesel price volatility.
Savings on Waste Disposal and Environmental Compliance
Save on coal ash disposal and landfill fees by repurposing ash as brick or construction material.
Reduced environmental compliance costs due to lower emissions compared to direct coal combustion.
Compare Coal Utilization Methods: Why Gasification is Better？
Coal Gasification Solution
Coal Gasification — Advantages
Controlled emissions: SO₂, NOx, and particulate emissions captured through syngas purification, meeting international emission standards.
High total efficiency: Combined Heat and Power mode exceeds 74% total efficiency — electricity plus usable heat from the same fuel.
Multi-path utilization: Syngas fuels power generation, industrial heating, or chemical production — ammonia, methanol, hydrogen.
Near-zero waste: No phenolic wastewater discharge. Ash repurposed as brick or construction material.
Direct Coal Combustion Solution
Direct Combustion — Limitations
High pollutant emissions: SO₂, NOx, and dust released during combustion.
Lower thermal efficiency: Typical boiler efficiency of 30–50%, comparable gasification CHP exceeds 74%.
Single-use energy: Coal burned once for heat or steam only.
Large ash waste volume: Ash requires ongoing landfill disposal.
Selling Coal / Buying Grid Power Solution
Selling Coal / Buying Grid Power — Limitations
Lost value capture: Raw coal sold at low commodity prices, while imported electricity or gas is purchased at premium rates.
Grid dependency: Power supply subject to price volatility and infrastructure constraints outside the operator's control.
No resource autonomy: Domestic coal reserves remain untapped as an energy asset, leaving the facility exposed to external energy markets.
How to Convert Coal into Syngas？
01 Coal Crushing and Screening: Feedstock Preparation
Powermax coal gasifiers require coal with a particle size of 13–25 mm or 25–50 mm, depending on the gasifier type. Crushing and screening ensure coal meets these specifications before entering the gasifier. To meet these specifications, configure crusher and vibrating screen at the front of the system.
02 Coal Gasification: Thermal Conversion
After preheating the gasifier with external fuel, a screw conveyor feeds the crushed coal into the reactor. At high temperatures (1,000–1,200°C) and under controlled oxygen conditions, coal undergoes partial oxidation and reduction — converting solid coal into combustible syngas, a gas mixture primarily omposed of CO, H₂, and CH₄. After gasification, water-cooled ash discharge systems remove ash from the gasifier, with dry or wet ash discharge options available.
03 Syngas Purification: Gas Cleaning and Cooling
After gasification, raw syngas passes through cyclone dust collectors and electrostatic precipitators (ESP) to remove dust, tar aerosols, and impurities. A gas cooler condenses residual moisture and liquid tar, delivering clean, dry, engine-grade fuel gas. Purified syngas is then fed into gas engine generator sets for baseload electricity, or directly supplied to kilns and boilers for industrial heating — providing stable, long-term revenue or cost savings for the operator.
