The Experimental Study on High Temperature Air Combustion and CF4 Decomposition

2005 ◽  
Author(s):  
L. Jia ◽  
S. Ma
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
High Temperature ◽  
Air Temperature ◽  
Waste Heat ◽  
Exhaust Gas ◽  
High Temperature Air Combustion ◽  
Factors Influencing ◽  
Regenerative Burner ◽  
Ceramic Honeycomb

For the purpose of decomposing the processing gases CF4 from semiconductor manufacturers, ceramic honeycomb regenerative burner system is suggested by using the principle of HTAC. A simulated high temperature air combustion furnace has been used to determine the features of HTAC flames and the results of the decomposition of CF4. The preheat air temperature of it is above 900 °C. The exhaust gas released into the atmosphere is lower than 150 °C. Moreover, the efficiency of recovery of waste heat is higher than 70%, the NOx level in exhaust gas is less than 300 mg/m3 and the distribution of temperature in the furnace is nearly uniform. The factors influencing heat transfer, temperature profile in chamber and NOx emission were discussed. Also some CF4 can be decomposed in this system. Experimental results indicated that the destruction removal efficiency (DRE) of CF4 increases with the increasing of concentration of H2O in some scale, and will not keep climbing when the concentration reach a point. DRE of CF4 decreases with the decreasing of concentration of CF4 under condition of other factors unchanged.

Studies on a High-Temperature Air Combustion Burner for a Compact Fuel-Cell Reformer

2007 ◽  
Vol 120 ◽  
pp. 135-140 ◽  
Author(s):  
K.H. Lee ◽  
Oh Chae Kwon
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Exhaust Gas ◽  
High Temperature Air Combustion ◽  
Fuel Processor ◽  
Temperature Distributions ◽  
Present Design ◽  
Regenerative Burner ◽  
Gas Recirculation ◽  
Minimum Heat

A new burner configuration for a compact fuel-cell reformer with a high-temperature air combustion concept was studied. The burner was computationally designed for a 40 Nm3/hr hydrogen-generating reformer using natural gas-steam reforming method. In order to satisfy the primary requirements for designing a reformer burner (uniform distribution of temperature along the fuel processor walls and minimum heat losses from the reformer), the features of the present burner configuration included 1) a self-regenerative burner for an exhaust-gas-recirculation to apply for the high-temperature air combustion concept, and 2) an annular-type shield for protecting direct contact of flame with the processor walls. For the present design conditions, the predicted temperature distributions along the processor walls were found uniform within 100 K variation. Thus, the present burner configuration satisfied the requirement for reducing temperature gradients along the processor walls, and consequently demonstrated that the high-temperature air combustion concept could be applied to the practical fuel reformers for use of fuel cells. The predicted uniform temperature distributions along the processor walls were experimentally demonstrated for a test burner.

Experimental study of operating characteristics of compression/absorption high-temperature hybrid heat pump using waste heat

2013 ◽  
Vol 54 ◽  
pp. 13-19 ◽  
Author(s):  
Jiyoung Kim ◽  
Seong-Ryong Park ◽  
Young-Jin Baik ◽  
Ki-Chang Chang ◽  
Ho-Sang Ra ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Heat Pump ◽  
Waste Heat ◽  
Operating Characteristics ◽  
Hybrid Heat Pump

Experimental study on heat transfer limit of high temperature potassium heat pipe for advanced reactors

2021 ◽  
Vol 151 ◽  
pp. 107935
Author(s):  
Chenglong Wang ◽  
Xiao Liu ◽  
Minghao Liu ◽  
Simiao Tang ◽  
Zhixing Tian ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
High Temperature ◽  
Heat Pipe ◽  
Heat Transfer Limit

scholarly journals Experimental Study on a Hydrogen Stratification Induced by PARs Installed in a Containment

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5552
Author(s):  
Jongtae Kim ◽  
Seongho Hong ◽  
Ki Han Park ◽  
Jin Heok Kim ◽  
Jeong Yun Oh
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Power Supply ◽  
Nuclear Power ◽  
Severe Accident ◽  
Experimental Simulation ◽  
Exhaust Gas ◽  
Metal Oxidation ◽  
Fuel Cladding ◽  
Analysis Model

Hydrogen can be produced in undesired ways such as a high temperature metal oxidation during an accident. In this case, the hydrogen must be carefully managed. A hydrogen mitigation system (HMS) should be installed to protect a containment of a nuclear power plant (NPP) from hazards of hydrogen produced by an oxidation of the fuel cladding during a severe accident in an NPP. Among hydrogen removal devices, passive auto-catalytic recombiners (PARs) are currently applied to many NPPs because of passive characteristics, such as not requiring a power supply nor an operators’ manipulations. However, they offer several disadvantages, resulting in issues related to hydrogen control by PARs. One of the issues is a hydrogen stratification in which hydrogen is not well-mixed in a compartment due to the high temperature exhaust gas of PARs and accumulation in the lower part. Therefore, experimental simulation on hydrogen stratification phenomenon by PARs is required. When the hydrogen stratification by PARs is observed in the experiment, the verification and improvement of a PAR analysis model using the experimental results can be performed, and the hydrogen removal characteristics by PARs installed in an NPP can be evaluated using the improved PAR model.

Experimental study of small scale and high expansion ratio ORC for recovering high temperature waste heat

Energy ◽  
2020 ◽  
Vol 208 ◽  
pp. 118321 ◽  
Author(s):  
Antti Uusitalo ◽  
Teemu Turunen-Saaresti ◽  
Juha Honkatukia ◽  
Radheesh Dhanasegaran
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Waste Heat ◽  
Expansion Ratio ◽  
Small Scale

scholarly journals Fluid Selection of Transcritical Rankine Cycle for Engine Waste Heat Recovery Based on Temperature Match Method

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1830
Author(s):  
Zhijian Wang ◽  
Hua Tian ◽  
Lingfeng Shi ◽  
Gequn Shu ◽  
Xianghua Kong ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Specific Heat ◽  
Waste Heat ◽  
Working Fluid ◽  
Exhaust Gas ◽  
Match Method ◽  
Working Fluids ◽  
Cold Source ◽  
Working Fluid Selection ◽  
Transfer Zone

Engines waste a major part of their fuel energy in the jacket water and exhaust gas. Transcritical Rankine cycles are a promising technology to recover the waste heat efficiently. The working fluid selection seems to be a key factor that determines the system performances. However, most of the studies are mainly devoted to compare their thermodynamic performances of various fluids and to decide what kind of properties the best-working fluid shows. In this work, an active working fluid selection instruction is proposed to deal with the temperature match between the bottoming system and cold source. The characters of ideal working fluids are summarized firstly when the temperature match method of a pinch analysis is combined. Various selected fluids are compared in thermodynamic and economic performances to verify the fluid selection instruction. It is found that when the ratio of the average specific heat in the heat transfer zone of exhaust gas to the average specific heat in the heat transfer zone of jacket water becomes higher, the irreversibility loss between the working fluid and cold source is improved. The ethanol shows the highest net power output of 25.52 kW and lowest electricity production cost of $1.97/(kWh) among candidate working fluids.

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