Methane (coalbed methane) generator set is a gas generator set that uses low concentration gas and high concentration gas for power generation. The gas generator set produced by Jinan Watt can generate electricity using gas with a concentration greater than 12%, mainly used for coal mine gas and mine gas power generation. The unit adopts a new gas engine design concept, independently developed, and utilizes advanced whole machine development systems, matched with world-class boosting, speed regulation, voltage stabilization, ignition, and operation management systems. It integrates cutting-edge patented combustion control, electronic control mixer and other technologies in the industry, and can automatically control the air-fuel ratio to adapt to changes in gas concentration, which is suitable for the characteristics coal mines with multiple points and small quantities. The unit has the characteristics of high safety, high reliability, high thermal efficiency, high cost-effectiveness, and fully automated operation and management.

Low-Concentration Methane Power Generation Technology

Coal mine methane is categorized into high-concentration and low-concentration methane. High-concentration methane refers to methane (methane) with a concentration exceeding 25%, while low-concentration methane denotes methane with a concentration below 25%. Over 60% of coal mine gas is low-concentration gas containing less than 25% methane. According to coal mine safety regulations, gas concentrations below 25% cannot be stored or transported.

Low-concentration gas power generation must address two challenges: First, each coal mine’s conditions vary significantly and constantly change, making it difficult for traditional power generation units to adapt to diverse scenarios. Second, ensuring the safe transportation of low-concentration gas poses a critical issue.

Leveraging the leading gas engine technologies of Shengdong and Jichai, Wate shandong energy technology Co., ООО. pioneered the development of high-performance high-concentration methane power generation units. Subsequently, the company advanced its capabilities by creating medium-to-high-power low-concentration methane power generation units suitable for such applications, establishing itself as one of the earliest manufacturers to master this technology. Among these, the 500KW and 600KW dual-concentration methane generator sets demonstrate the most outstanding performance and high cost-effectiveness. The units employ electronically controlled gas mixing technology to automatically regulate the air-fuel ratio, adapting to variations in methane concentration. This aligns with the characteristics of coal mines, which are numerous but small in scale. Additionally, the company has invented low-concentration methane safety transportation technology, utilizing fine water mist technology to resolve the challenge of safely transporting low-concentration methane above ground.

Requirements for Gas Supply to the Unit:

Within 1 meter of the gas inlet valve of the gas-fired unit:

1. Gas temperature ≤40°C;
2. Gas pressure 3–20 kPa, pressure change rate ≤1 kPa/min;

3. H₂S ≤ 200 mg/Nm³;

4. For CH₄ volume content: High-concentration gas generators require methane content ≥25%; low-concentration gas generators require methane content between 12%–25% for normal startup.

5. Water content in gas ≤40g/Nm³

6. Particle size of impurities ≤μm, impurity content ≤30mg/Nm³.

If combustible gases contain high levels of sulfur and ammonia, they not only severely corrode spark plug electrodes but also increase acid value in engine oil, corroding internal components. These gases also readily form deposits, accelerating engine wear and corrosion.

Our company can configure gas generator sets with single-unit power ranging from 100KW to 800kW based on customer requirements. For projects exceeding 1MW installed capacity, we recommend using multiple 500KW units in parallel grid connection for the highest overall cost-effectiveness. This approach ensures more stable power plant operation, easier maintenance, and lower upkeep costs.