EXPERIMENTAL RESEARCH INSIDE A GAS HEATER WITH DIFFERENT INTERMEDIATE HEAT CARRIER MEDIUM
The gas heater is one of the key equipments in gas industry, which plays the role of heating natural gas to the required processing temperature, and the application of gas heater shows a promising prospect. The cylindertype heating device with an intermediate heat carrier medium is most widely employed. Apparently, the selection of intermediate heat carrier medium and the form of heat transfer process of the intermediate heat carrier medium, i.e. the flow field organization in the large capacity cylinder, is the key elements that greatly affect the thermal efficiency of gas heater. A real gas heater experimental system, which is the only one in China, is built. The present paper characterizes water and ethylene glycol as the intermediate heat carrier medium. Experimental measurements and analysis on the flow condition and temperature distribution between the water and ethylene glycol in the cylinder were carried out. The results shown that using ethylene glycol as the heat carrier media can widen the application range of gas heater. The efficiency of the heater with ethylene glycol as the heat carrier medium is at least 3.8% higher than that with water as the heat carrier medium under the same working conditions. The thermal efficiency of gas heater is usually less than 87%.
Structure and heat transfer analysis on natural gas heater
As a special type of heater,natural gas heater is indispensable equipment in natural gas application system.According to the structure of natural gas heater,its heating surface and cooling surface are all eccentrically-oriented.The mathematic analysis of natural convection in eccentric cylinder was conducted,the medium flow and temperature field were numerically simulated in the bipolar coordinate system.The result indicates that the flow and heat transfer would perform the best when the heating surface is in the lower half of the cylinder.
Laminar heat or mass transfer in rectangular channels and in cylindrical tubes for fully developed flow: comparison of solutions obtained for various boundary conditions
Abstract A comparison is made of results obtained with various boundary conditions at the wall of the channels. By comparing blood Sherwood numbers for finite wall resistance with those for constant concentration boundary condition only a small variation is found for various points along the blood channel.