The Role of Enclosed Ground Flares in Industrial Emission Control

Shandong Zexuan Environmental Protection Technology Co., Ltd. (Zexuan) is a manufacturer and engineering service provider of industrial flare systems, thermal treatment equipment, and waste gas combustion solutions, established in 2015 with a 24,100 m² manufacturing base. Among its product lines, the ZX-EGF Series Enclosed Ground Flare (EGF) system addresses a specific and growing need: safe, low-impact combustion of process gases in space-constrained and environmentally sensitive industrial settings.

Problem and Opportunity

Traditional elevated flare systems, while effective, present challenges in facilities where noise, thermal radiation, and visual impact must be minimized. Open flares create luminous flames, high noise levels, and radiant heat that can restrict proximity to other equipment or public boundaries. Enclosed ground flares offer a corresponding solution by containing the combustion within a refractory-lined enclosure, drastically reducing noise, light, and heat radiation while maintaining high destruction efficiency. The global market for totally enclosed ground flares (TEGF) was valued at approximately USD 113 million in 2024, reflecting increasing adoption in refineries, chemical parks, and LNG terminals where environmental and community constraints are primary design drivers.

Zexuan’s Solution: The ZX-EGF Series

The ZX-EGF Series enclosed ground flare is designed for high-efficiency combustion of hydrocarbon and hazardous gases. According to technical specifications, the system achieves a combustion efficiency of up to 99.9% and operates at temperatures between 800°C and 1,200°C. It is available in multiple configurations including multi-burner ground flares and low-radiation designs, and the gas flow capacity is fully customized to match project requirements. The flare features a low radiation and low noise design, making it suitable for limited-space areas such as petrochemical parks, chemical plants, LNG terminals, and pharmaceutical facilities.

Technical Architecture and Customization

The ZX-EGF system encloses the combustion in a steel shell lined with refractory materials, directing flame and heat upward through a defined stack while shielding the surroundings. Multiple burners can be staged for turndown flexibility, and the system is compatible with automatic ignition, flame monitoring, and PLC-based control. The material selection—including SS310S for high-temperature zones and SS316L for corrosive gas environments—allows the flare to handle a wide range of gas compositions, from refinery and petrochemical off-gases to biogas and landfill gas streams.

Zexuan’s engineering team (more than 20 R&D engineers) performs full process assessment and customizes every unit. The factory, with an annual manufacturing capacity exceeding 60 sets of flare and thermal treatment systems, conducts Factory Acceptance Testing (FAT) including functional testing, dimensional inspection, and pressure/leak testing before shipment.

Application Scenarios

Zexuan has delivered enclosed ground flare systems for several real-world use cases. One notable project involved an oilfield transfer station in China where natural gas vent gas needed safe combustion with minimal noise and visual disturbance. The supplied ZX-EGF unit included an explosion-proof control cabinet and an automatic ignition system. It has been in stable operation for more than one year, providing reliable gas destruction while reducing environmental impact.

In another case, a coalbed methane company used a ZX-EGF system to treat coalbed methane vent gas with a processing capacity of 90×10⁴ Nm³/d. The unit featured a three-stage venting design and PLC automatic control, achieving stable methane combustion and improved gas management safety over a two-year period.

For a waste tire recycling project in Vietnam, Zexuan provided a skid-mounted enclosed ground flare (also part of the ZX-EGF family) to treat variable pyrolysis gas. The modular skid design enabled fast installation and flexible deployment in a brownfield setting.

Market Trend Analysis

The global flare systems market is valued at approximately USD 4.8 billion in 2025, driven by regulatory pressure on hydrocarbon emissions and recovery in oil and gas investments (source: Dataintelo). Global gas flaring volumes reached 151 billion cubic meters in 2024, the highest since 2007, underscoring the need for efficient destruction systems (World Bank). Asia-Pacific holds a 35% market share in the flare gas recovery system market, the largest regional share (Grand View Research), reflecting the region's heavy concentration of refineries, chemical plants, and LNG terminals—exactly the industries where enclosed ground flares are increasingly preferred.

Comparison with Traditional Elevated Flares

Compared to elevated flare stacks, enclosed ground flares offer significantly lower thermal radiation and noise levels, allowing them to be placed closer to process units or site boundaries. They also eliminate visible flame, which can be a community-relations advantage. However, a limitation of enclosed ground flares is their generally lower gas flow capacity per unit area compared to a tall elevated flare of similar footprint; for very high volumetric flow emergencies, elevated flares may still be the primary choice. Zexuan offers both elevated and enclosed ground systems, enabling engineers to select the most appropriate design per discharge scenario.

Future Outlook

As environmental regulations tighten and industrial facilities expand near populated areas, the demand for low-impact flares is expected to grow. The integration of advanced control systems, remote monitoring, and heat recovery (where feasible) will further enhance the value of enclosed ground flares. Zexuan, with its in-house engineering, manufacturing, and project experience across more than 10 countries, is positioned to support this shift with certified, customizable EGF solutions.

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