Gases maximum operating temperature

This simulation can be achieved in terms of a source—sink relationship. Rather than use the gas concentration around the test object as a target parameter, the test object can be surrounded by a sink of ca 2-7T soHd angle. The solar panel is then maintained at its maximum operating temperature and irradiated by appropriate fluxes, such as those of photons. Molecules leaving the solar panel strike the sink and are not likely to come back to the panel. If some molecules return to the panel, proper instmmentation can determine this return as well as their departure rates from the panel as a function of location. The system may be considered in terms of sets of probabiUties associated with rates of change on surfaces and in bulk materials. [Pg.368]

In both the OSHA PSM Standard and the EPA RMP regulation, the PHA element does not currently specify the factors that must be considered to effectively manage reactive hazards. Present requirements should be augmented to explicitly require an evaluation of such factors as rate and quantity of heat generated maximum operating temperature to avoid decomposition thermostability of reactants, reaction mixtures, byproduct waste streams, and products effect of charging rates, catalyst addition, and possible contaminants and understanding the consequences of runaway reactions or toxic gas evolution. [Pg.355]

Screening techniques are relatively cost-effective and require only a small chemical sample however, they do not measure gas evolution or maximum pressure rise. A material is generally considered to be thermally stable if the temperature at which energy from reaction is first observed is at least 100 degrees Celsius (°C) above the maximum operating temperature of a process event under upset conditions (CCPS 1995b p. 93). [Pg.405]

Germani et al. [82] wash-coated Cu/ZnO catalyst on to micro channels and compared their performance with that of conventional monoliths for the low-temperature water-gas shift. Up to six plates could be put into a stack-like reactor heated by cartridges, which had a maximum operation temperature of600 °C (see Figure 2.47). The reactor had capabilities for measuring the inlet and outlet temperature of the gases via thermocouples. [Pg.337]

Gas permeance through the membranes was measured in the pressure-controlled dead-end mode [18], The disc-shaped membranes were placed in the commercially permeance cells, K250 and K500 as mentioned before. Maximum operation temperatures were 300 and 600°C respectively. The membrane was fitted in the cell with the microporous top-layer at the gas feed side. The pressure difference over the membrane was adjusted by an electronic pressure controller. The gas flow through the membrane was measured by electronic mass flow meters. A schematic representation of the permeance set-up is given in Figure 5. [Pg.94]

Desirable properties of the immobilized liquid phase in a gas-liquid chromatographic column include (1) low volatility (ideally, the boiling point of the liquid should be at least 100°C higher than the maximum operating temperature for the column) (2) thermal stability (3) chemical inertness and (4) solvent characteristics such that k and a (see Section 30E-4) values for the solutes to be resolved fall within a suitable range. [Pg.961]

One of the advantages of mixed potential sensors is that it is possible for both electrodes to be exposed to the same gas. The elimination of a need to separate the two electrodes simplifies the sensor design, which in turn reduces fabrication costs. Although this simpler planar design is often used, the electrodes are sometimes separated to provide a more stable reference potential. As with equilibrium potentiometric sensors, the minimum operating temperature is often limited by electrolyte conductivity. However, the maximum operation temperatures for nonequilibrium sensors are typically lower than those of equilibrium sensors, because the electrode reactions tend towards equilibrium as the temperature increases. This operating temperature window depends on the electrode materials, as will be discussed later in the chapter. [Pg.434]

The disadvantage of metallic monoliths is that their maximum operating temperatures are substantially below the 1300 °C combustor outlet temperature required for current gas turbines. They can therefore only be used in combustor designs that limit the catalyst wall temperature in some way, such as the hybrid combustors described above in Section 3.4. [Pg.191]

The furnace is 200 kg, has a maximum operating temperature of 1875 K, and at full power, consumes 13.5 kW. The heating elements are silicon carbide and the heated region of the furnace is divided into three zones. The temperature is controlled in each zone to 2 K as measured by thermocouples on the outside of the flow tube. Measurements on a movable injector have confirmed that the temperature inside the flow tube is the same as the furnace temperature. The downstream sampling region is sealed by abutting the furnace to the sampling structure, which is water-cooled. The entire furnace is in a vacuum box to reduce gas leaks into the flow tube. [Pg.92]

The specifications of commercial BF3 counters consist of sensitivity, dimensions, composition of the filling gas, operating voltage, and maximum operating temperature. [Pg.472]

Operating at temperatures below the flashpoint of a liquid will avoid the formation of a flammable atmosphere as the vapour concentration will be below the lower flammable limit. It is also possible to work at temperatures where vapour concentrations exceed the upper flammable limit, but in this case it is necessary to pass through the flammable region when the plant is started up and shut down. Additional measures such as inert gas blanketing may be neees-sary at these times. When safety is based on temperature control a margin of at least 5°C should be allowed between the maximum operating temperature and the flashpoint of the liquid. [Pg.132]

Figure 6.18 Maximum operation temperatures of supported [EMiM][NTf2] and [EMiMjfEtSOg] for a fixed bed with throughput of gas (initial filling degree = 20%, 1 bar, d = 1 mm, Ug = 1 ms", assumption of = 0.2p ).

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