Optimal parameter adjustment of catalytic combustion heaters for oil shale in-situ conversion of low calorific value gases

Shui, Haoche; Wang, Yuan; Liu, Zhao; Guo, Wei

doi:10.1016/j.jclepro.2023.139020

Cited by 7 publications

(2 citation statements)

References 107 publications

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“…Due to the low combustible gas content and the presence of inert gases such as CO 2 and N 2 in low-and medium-calorific-value gas, combustion issues such as difficulties with ignition, low combustion stability, and incomplete combustion often occur [5][6][7]. The substantial reserves of low-and medium-calorific-value gas for comprehensive recycling hold significant importance in energy conservation, emission reduction, and ecological protection [8,9].…”

Section: Introductionmentioning

confidence: 99%

The Structural Design of and Experimental Research on a Coke Oven Gas Burner

Geng,

Jin,

Wang

2024

Sustainability

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A novel low-NOx burner was proposed in this study to achieve the stable and clean combustion of low- and medium-calorific-value gas and promote energy sustainability, and the influence of the gas pipe structure on the burner’s characteristics was studied with coke oven gas as a fuel. A 40 kW burner test bench was established to conduct cold-state experiments to investigate the influences of the gas pipe structure on the aerodynamic characteristics of the burner. We performed numerical simulations on both a 40 kW burner and a 14 MW prototype burner to investigate the thermal performance of the burners and their impact on low NOx emissions. The experimental results showed that increasing the deflection angle of the gas pipe nozzle direction relative to the circumferential tangent direction, the high-velocity zone and the high-concentration zone of the flow field move towards the central axis. Increasing the bending angle of gas pipe nozzle direction relative to the axis direction caused the high-velocity zone and the high-concentration zone to move upstream direction of the jet. The simulation reveals that the NO concentration at the exit cross-section of the combustion chamber of the 14 MW prototype burner is 17.00 mg/m3 (with 3.5% oxygen content). A recommended design structure of the burner was proposed, with a deflection angle of 0°and a bending angle of 0° for the No. 3 gas pipe, and a deflection angle of 15° and a bending angle of 30° for the No. 4 gas pipe.

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Section: Introductionmentioning

confidence: 99%

The Structural Design of and Experimental Research on a Coke Oven Gas Burner

Geng,

Jin,

Wang

2024

Sustainability

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“…Downhole heaters are categorized into two types based on their heat generation mechanisms: combustion heaters and electric heaters [10][11][12][13]. Concerning downhole stability, combustion heaters significantly lag behind electric heaters [14,15]. Consequently, electric heaters are the more prevalent choice in the in situ conversion process [16,17].…”

Section: Introductionmentioning

confidence: 99%

Numerical Heat Transfer Simulation of Oil Shale Large-Size Downhole Heater

Bu,

Li,

2024

Applied Sciences

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Downhole heaters are critical for effectively achieving in situ oil shale cracking. In this study, we simulate the heat transfer performance of a large-scale helical baffle downhole heater under various operational conditions. The findings indicate that at 160 m3/h and 6 kW the outlet temperature can reach 280 °C. Controlling heating power or increasing the injected gas flow effectively mitigates heat accumulation on the heating rod’s surface. The outlet temperature curve exhibits two phases. Simultaneously, a balance in energy exchange between the injected gas and heating power occurs, mitigating high-temperature hotspots. Consequently, the outlet temperature cannot attain the theoretical maximum temperature, referred to as the actual maximum temperature. Employing h/∆p13 as the indicator to evaluate heat transfer performance, optimal performance occurs at 100 m3/h. Heat transfer performance at 200 m3/h is significantly impacted by heating power, with the former being approximately 6% superior to the latter. Additionally, heat transfer performance is most stable below 160 m3/h. The gas heating process is categorized into three stages based on temperature distribution characteristics within the heater: rapid warming, stable warming, and excessive heating. The simulation findings suggest that the large-size heater can inject a higher flow rate of heat-carrying gas into the subsurface, enabling efficient oil shale in situ cracking.

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Flame Propagation of Premixed Gas with Enhanced Heat Recirculation: Dynamic Characteristics of Lean and Rich Combustion

Dai,

Zou,

Wang

et al. 2024

Energy Tech

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Porous media combustion greatly improves the combustion of low calorific value gas (LCG), and appropriate heat control contributes to optimizing the flame evolution. To obtain the dynamic characteristics of lean‐rich combustion, an enhanced heat‐recirculating burner is built by embedding the cylindrical rod with high thermal conductivity. The temperature distribution and gas products are investigated under different rod parameters and operating conditions. The results indicate that the reduction of the equivalence ratio and inlet velocity are both beneficial for the upstream propagation of rich‐methane flame, which has an opposite trend to lean combustion. Regardless of the direction in which the rich‐methane flame propagates, the flame propagates the fastest as the diameter of the cylindrical rod is 8 mm. When the 8–120 cylindrical rod is embedded in the burner, the downstream propagation time is shortened by 73.40%. The appropriate embedment of the cylindrical rods in porous media not only accelerates the rich‐methane flame propagation but also promotes the conversion of methane to syngas. Moreover, the decrease in pellet diameter is also conducive to increasing syngas production. The above conclusions provide theoretical support for the efficient and clean utilization of LCG in the porous media.

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Optimal parameter adjustment of catalytic combustion heaters for oil shale in-situ conversion of low calorific value gases

Cited by 7 publications

References 107 publications

The Structural Design of and Experimental Research on a Coke Oven Gas Burner

The Structural Design of and Experimental Research on a Coke Oven Gas Burner

Numerical Heat Transfer Simulation of Oil Shale Large-Size Downhole Heater

Flame Propagation of Premixed Gas with Enhanced Heat Recirculation: Dynamic Characteristics of Lean and Rich Combustion

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