Simulation Study on the Effect of Fuel Preheating Temperature on Temperature Field and NOx Emission of 130kW Natural Gas Heater

2019 ◽  
Author(s):  
Zhongwei Zhou ◽  
Yun Guo
Keyword(s):  
Temperature Field ◽  
Natural Gas ◽  
Simulation Study ◽  
Nox Emission ◽  
Preheating Temperature

Application of Noncircular Primary-Air Inlet Geometries in the Inshot Burners of Residential Gas Furnaces

1996 ◽  
Vol 118 (1) ◽  
pp. 58-64 ◽  
Author(s):  
P. Kolluri ◽  
A. Kamal ◽  
S. R. Gollahalli
Keyword(s):  
Temperature Field ◽  
Natural Gas ◽  
Combustion Chamber ◽  
Field Measurements ◽  
Air Entrainment ◽  
Combustion Products ◽  
Nox Emission ◽  
Air Inlet ◽  
Emission Index

Experiments with an inshot burner used in residential natural gas furnaces are presented. The concentrations of NOx, NO, and CO in the combustion products of partially aerated natural gas flames were measured in a laboratory combustion chamber. When the conventional circular venturi inlet of the inshot burner was replaced by elliptic venturi inlets, an increase of up to 30 percent in the primary-air entrainment and a decrease of up to 20 percent in the NOx emission index were observed. Temperature field measurements in the flames were in conformity with the emission index measurements.

scholarly journals Research on Preheating Temperature Field Test of Natural Gas Pipeline in Service Welding under Extreme Condition

2021 ◽  
Vol 353 ◽  
pp. 01001
Author(s):  
Yan Xu ◽  
Yinglai Liu ◽  
Zhenjun Feng ◽  
Xianghui Nie ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Natural Gas ◽  
Gas Flow ◽  
Gas Pipeline ◽  
Heating Power ◽  
Measured Temperature ◽  
Gas Flow Rate ◽  
Natural Gas Pipeline ◽  
Preheating Temperature ◽  
Frequency Heating

When the natural gas pipeline is welding in service, the fast flowing medium with pressure in the pipe will take away a lot of heat, and the preheating temperature is not easy to be guaranteed, so it is easy to appear hydrogen-induced crack. In this paper, the in-service welding preheating temperature field of natural gas pipeline under the limit condition of unreduced volume was studied, and the pre-welding preheating test was carried out by using the medium frequency heating method. It is found that the temperature below the heating belt increases gradually with the increase of the intermediate frequency heating power, and the fitting shows a quadratic polynomial gradient. There are differences in preheating temperatures on the same circumference. The highest temperature mostly appears in the direction of 3 point of the pipeline, while the lowest temperature mostly appears in the direction of 0 point, which is related to the tightness of the heating belt, sunshine, blowing and other factors. In addition, the preheating temperature field of the pipeline in service is related to the gas flow in the pipeline. At the same heating power, the downstream temperature of the heating belt is higher than the upstream temperature at the same location, and the closer to the heating belt, the higher the temperature is. When the gas flow rate reaches 9.37m/s and the heating power is 160kW, the average measured temperature at 50mm upstream and downstream of the heating belt of Φ1016 pipeline is 107℃, and the average measured temperature at 50mm upstream of the heating belt is 71℃. When the gas flow rate reaches 8.91m/s and the heating power is 200kW, the average measured temperature at the downstream 50mm of the heating belt of Φ1219 pipeline is 72℃, the average measured temperature at the upstream 50mm of the heating belt is 52℃and the average measured temperature at the upstream 30mm of the heating belt is 71℃..

Experimental and simulation study on high-pressure V-L-S cryogenic hybrid network for CO2 capture from highly sour natural gas

2021 ◽  
Author(s):  
Khuram Maqsood ◽  
Abulhassan Ali ◽  
Rizwan Nasir ◽  
Aymn Abdul Rehman ◽  
Abdullah. S. Bin Mahfouz ◽  
...  
Keyword(s):  
High Pressure ◽  
Natural Gas ◽  
Co2 Capture ◽  
Simulation Study ◽  
Hybrid Network

Application of Reburning for NOx Control to a Firetube Package Boiler

1985 ◽  
Vol 107 (3) ◽  
pp. 739-743 ◽  
Author(s):  
J. A. Mulholland ◽  
W. S. Lanier
Keyword(s):  
Natural Gas ◽  
Reaction Order ◽  
Nox Reduction ◽  
Process Variable ◽  
Nox Emission ◽  
Boiler Load ◽  
Second Stage ◽  
Primary Zone ◽  
Dominant Process ◽  
Nox Control

A 730 kW (2.5 × 106 Btu/hr) firetube package boiler was used to demonstrate the application of reburning for NOx emission control. An overall reduction of 50 percent from an uncontrolled NOx emission of 200 ppm was realized by diverting 15 percent of the total boiler load to a natural-gas-fired second stage burner. Tests indicate that the overall reaction order of destruction with respect to initial NOx is greater than one; thus, larger reductions can be expected from reburning applications to systems with higher initial NOx. Rich zone stoichiometry has been identified as the dominant process variable. Primary zone stoichiometry and rich zone residence time are parameters that can be adjusted to maximize NOx reduction. Reburning applied to firetube package boilers requires minimal facility modification. Natural gas would appear to be an ideal reburning fuel as nitrogen in the reburning fuel has been shown to inhibit NOx reduction.

FEM Modeling and Validation of the Temperature Field in the Plasma Arc Bending of Laminated Clad Metal Sheets

2012 ◽  
Vol 602-604 ◽  
pp. 468-471
Author(s):  
Wen Qing Song ◽  
Jing Fu Chai ◽  
Wen Ji Xu
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Partial Melting ◽  
Energy Input ◽  
Mechanical Force ◽  
Plasma Arc ◽  
Fem Modeling ◽  
Temperature Variations ◽  
Preheating Temperature ◽  
Metal Sheets

Plasma arc bending of laminated clad metal sheets (LCMS) is a newly developed technique that produces deformation in the LCMS by thermal stress instead of external mechanical force. Since the temperature field leads to the thermal stress, a FEM mode was developed to study the temperature variations in the plasma arc bending of the LCMS which was validated robustness by the experiments. The results show that the temperature variations of the LCMS include the preheating, temperature dramatically changing and cooling stages. The lowest temperature is in the inlet whereas the highest temperature is in the outlet along the heating line. It needs to regulate the energy input of the plasma arc to avoid the possible partial melting of the LCMS.

scholarly journals Simulation Study on Temperature Field and Cold Plate Melting of Cold Storage Refrigerator Car

2017 ◽  
Vol 142 ◽  
pp. 3394-3400 ◽  
Author(s):  
Xu Xiaofeng ◽  
Zhang Xuelai ◽  
Jotham Muthoka Munyalo
Keyword(s):  
Temperature Field ◽  
Cold Storage ◽  
Simulation Study ◽  
Cold Plate

Operating Characteristics of Natural Gas Fueled Homogeneous Charge Compression Ignition Engine

1999 ◽  
Author(s):  
Y. Kawabata ◽  
K. Nakagawa ◽  
F. Shoji
Keyword(s):  
Natural Gas ◽  
Homogeneous Charge Compression Ignition ◽  
Nox Emission ◽  
Compression Ignition ◽  
Operating Characteristics ◽  
Compression Ignition Engine ◽  
Gas Engine ◽  
Engine Combustion ◽  
Gas Fueled ◽  
Homogeneous Charge

Abstract Recently, a new design of engine combustion that achieves higher efficiency and less NOx emission has been proposed. Some researchers have started studying the concept, which is called Homogeneous Charge Compression Ignition (HCCI), but there have been few reports on investigations using a future prospective alternative fuel, natural gas. In this study, natural gas fueled operation of HCCI using a single cylinder gas engine was conducted. Operating and exhaust characteristics were obtained. Experimental data confirmed the potential of higher efficiency and less NOx emission, though THC and CO were higher. Based on these data, the feasibility of this concept for gas engines is also examined.

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