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Shand & Jurs 97311 Enclosed Waste Gas Burner

Enclosed High-Efficiency Biogas Burner

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Shand & Jurs 97311 Enclosed Waste Gas Burner

For landfill gas compliance engineers, wastewater plant operators, and biogas processing managers, the Shand & Jurs 97311 Enclosed Waste Gas Burner destroys excess methane in a vertical combustion chamber — eliminating visible flame and reducing light and odor impact for installations near populated or sensitive receptors.

Unlike open atmospheric candlestick flares that rely on dispersion and depend on visual flame monitoring, the 97311 encloses the combustion zone, achieves ≥99% destruction efficiency, and delivers measured low NOx and CO emissions suitable for permit-sensitive sites.

Natural draft combustion maintains stable air-to-gas mixing and residence time inside the chamber, while a tiered burner design gives a significantly higher turndown than conventional enclosed burners. The natural-draft architecture eliminates the need for refractory lining and mechanical air supply.

A ground-level inspirating venturi pilot with optional UV flame verification initiates combustion on remote contact or pressure-permissive signal. The 97311 suits anaerobic digesters, landfill gas systems, fermentation off-gas, municipal wastewater treatment, food & beverage, and odor-sensitive sites — aligned with NFPA 820 and fitting within EPA 40 CFR Part 60 Subpart WWW / Cf and 40 CFR Part 63 MACT programs.

Shand & Jurs 97311
Shand & Jurs 97311 Enclosed Waste Gas Burner
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Features

Enclosed Combustion Chamber

Eliminates visible flame and reduces light nuisance, supporting siting near populated or odor-sensitive receptors with fewer community complaints.

High Destruction Efficiency

Natural-draft combustion achieves ≥99% methane destruction with measured low NOx (0.06 lb/MMBTU) and CO (0.2 lb/MMBTU) emission levels.

Natural Draft Combustion

Stable air-to-gas mixing without mechanical blowers or refractory lining, reducing installed cost and eliminating a powered auxiliary failure point.

Tiered Burner Design

Delivers significantly higher turndown than conventional enclosed burners, maintaining stable combustion across fluctuating digester gas flow rates.

Ground-Level Venturi Pilot

Inspirating venturi ignition at grade simplifies maintenance access and improves ignition reliability across fluctuating methane and saturated gas.

Automatic Ignition Sequencing

Pressure-permissive or remote-contact activation supports unattended operation, with flame verification preventing unburned methane release during startup.

Applications

  • Anaerobic Digesters: Destroys surplus digester gas with rated efficiency, supporting emissions reporting and reducing permitting exposure at municipal and industrial sites.
  • Landfill Gas Systems: Handles collected landfill gas with measured NOx and CO emissions, fitting within Subpart WWW/Cf monitoring and destruction programs.
  • Fermentation Off-Gas: Destroys off-gas streams from industrial fermentation processes where rated destruction efficiency and suppressed flame visibility are both required.
  • Municipal Wastewater Treatment: Disposes of sludge-digester biogas at POTW sites where permit and community-siting constraints require enclosed combustion and rated emissions.
  • Odor-Sensitive Installations: Suits sites adjacent to neighborhoods, schools, or commercial districts where open-flame candlestick flares would generate light, odor, or nuisance complaints.
  • Food & Beverage: Destroys off-gas from process fermentation, wastewater treatment, and anaerobic digestion at food and beverage plants with community or permit visibility constraints.
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Specifications

Parameter

Specification

Device Type

Enclosed biogas waste gas burner (enclosed flare)

Sizes

3″, 4″, 6″, 8″, 10″, 12″

Manifold Connection

ANSI 150 lb. Raised Face Flange

Destruction Efficiency

≥ 99%

Operating Temperature

1400°F to 1800°F

Max NOx (1-hour average)

0.06 lb/MMBTU

Max CO (1-hour average)

0.2 lb/MMBTU

Max VOC (1-hour average)

0.08 lb/MMBTU

Turndown

10:1 (typical; tiered burner supports higher turndown than conventional enclosed designs)

Mounting

ANSI 150 RF flange. Standard mounting flange is one size larger than nominal pipe size.

Gas Composition

50–70% CH₄ with CO₂ balance and trace gases

Moisture Content

Saturated (100% humidity)

Pilot Gas

Natural gas, propane, or dual (≥500 BTU/ft³)

Pilot Gas Pressure

4″–30″ W.C. (low pressure) or 1–30 PSIG (high pressure)

Pilot Operation

Continuous while burning, intermittent, or 24/7 standing pilot

Power Requirements

120 VAC standard; 220 VAC optional

Controller Temperature Range

−20°F to 150°F

Control Functions

Manual start, Remote start, Automatic sequencing

Contact Outputs

Alarm SPDT; Flame proven SPDT

Optional Outputs

Pilot failure; Main gas open status

Venturi Material

347 Stainless Steel

Thermocouple

Inconel with Type K wiring

Control Box

NEMA 4, NEMA 4X Stainless Steel, or NEMA 7 Aluminum – UL508A available

Stack Assembly

304L Stainless Steel (316L optional)

Burner Assembly

304L Stainless Steel (316L optional)

Manifold / Pilot Assembly

304L Stainless Steel (316L optional)

Variant

97311T adds touchscreen panel; identical combustion performance

Options

Touchscreen (97311T); pilot and main gas flame detection (UV); explosion-proof NEMA 7 enclosure; 316 SS gas piping; pressure-switch start; weather hood and equipment stand

Contact Support
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Contact Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

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When should I specify the 97311 Enclosed Burner instead of the open 97300 or 97301?

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Specify the 97311 when rated destruction efficiency is required, when visible flame must be suppressed, or when the site is near populated or odor-sensitive receptors. The 97311 is rated at ≥99% methane destruction with published low-NOx and low-CO emission limits and encloses the combustion zone within a vertical chamber. Choose the open 97300 or 97301 where a rated destruction efficiency is not required and atmospheric flare construction is acceptable.

What destruction efficiency does the 97311 achieve?

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The 97311 achieves ≥99% destruction efficiency at operating temperatures of 1400–1800°F. Maximum one-hour-average emissions are 0.06 lb/MMBTU NOx, 0.2 lb/MMBTU CO, and 0.08 lb/MMBTU VOC, measured during rated operation. Final emission compliance is determined at the site by the owner-operator and the permitting authority.

Why natural draft rather than forced-air combustion?

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Natural-draft combustion maintains stable air-to-gas mixing without a mechanical blower, which eliminates a powered auxiliary that could fail and reduces installed complexity. It also allows the chamber to operate without refractory lining. The tiered burner design preserves combustion stability across fluctuating digester gas flow rates, giving significantly higher turndown than conventional enclosed-burner designs.

How is the burner ignited?

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A ground-level inspirating venturi pilot provides ignition, with optional UV flame verification confirming that the main flame is established before gas is admitted. Automatic ignition is initiated through a remote contact or pressure-permissive signal, so the burner can operate unattended and respond to upstream pressure conditions. Flame-proven contact outputs feedback to plant SCADA.

What methane and moisture ranges are supported?

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The 97311 is designed for 50–70% CH₄ gas saturated at 100% humidity, typical of anaerobic digester and landfill gas. The stoichiometric pilot and natural-draft chamber sustain combustion across that BTU and moisture range without requiring upstream gas drying or conditioning.

Is the 97311 suitable for hazardous-area installations?

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Yes. An explosion-proof NEMA 7 control enclosure is available as an option, with UL508A panels available on request. Standard enclosures are NEMA 4 or NEMA 4X stainless steel. 316 stainless gas piping is available for aggressive biogas service.

Where does the 97311 fit regulatory-wise?

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The 97311 supports biogas-handling architecture aligned with NFPA 820 expectations for wastewater and digester facilities and fits within monitoring and destruction programs that reference EPA 40 CFR Part 60 Subpart WWW/Cf and 40 CFR Part 63 MACT. For MCERTS-aligned emissions reporting, the 97311 pairs with Sonitus Systems monitoring instrumentation. Final compliance is determined at the site by the owner-operator and the permitting authority.

Summary

With over a century of tank-safety heritage inside Cognesense, the Shand & Jurs 97311 Enclosed Waste Gas Burner is chosen when biogas must be destroyed with rated efficiency and without visible flame. Its natural-draft combustion chamber, tiered burner design, and ground-level venturi pilot deliver ≥99% methane destruction with measured low NOx and CO emissions at digesters, landfill gas sites, fermentation off-gas, and odor-sensitive installations. For permit-driven biogas facilities, it is trusted wherever you need to measure, monitor, and protect what matters most.

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