Standard cubic feet per hour SCFH

In general, the rate of deactivation was much lower at the lower fresh gas feed rate than at the higher feed rates. For example, the rate of deactivation was 0.022%/mscf/lb during the period between 600 and 800 hrs stream time at the lower feed rate of 206 standard cubic feet per hour (scfh) whereas it was 0.143%/mscf/lb for the period between 100 and 400 hrs when the fresh feed rate was about 386 scfh. 

Bench-Scale Reactor. The bench-scale reactor is 0.81 in. i.d. and 48 in. long. The nominal feed gas rate for this unit is 30 standard cubic feet per hour (scfh) the feed gas is supplied from premixed, high-pressure gas cylinders. Except for reaction temperature, the bench-scale unit is substantially manually operated and controlled. The catalysts used in these studies were standard commercial methanation catalysts ground to a 16-20 mesh size which is compatible with the small reactor diameter. 

For relatively low pressure drops, the effect of compressibility is negligible, and the general flow equation [Eq. (10-29)] applies. Introducing the conversion factors to give the flow rate in standard cubic feet per hour (scfh) and the density of air at standard conditions (1 atm, 520°R), this equation becomes... 

The number of moles of gas compressed or the standard cubic feet per hour (SCFH) is constant. 

Nitrogen usually is produced by cryogenic air separation, liquefaction of atmospheric air, and removal of the nitrogen by distillation, as described earlier. Noncryogenic adsorption technology, including PSA and VSA systems, economically provides nitrogen for requirements between 4,000 and 30,000 standard cubic feet per hour (SCFH).9... 

Figure 5 shows the step currents from the power supplies and the resulting hydrogen flow in standard cubic feet per hour (scfh) from the system. Hydrogen production ripple is caused by the internal hydrogen phase separator pumping down the... 

We transform this to units of standard cubic feet per hour (scfh) by noting that a mass that has volume V at (p, r ) will have volume V / at p = 14.7 psia, T = 520°R, where ... 

Perform a technoeconomic study for an on-site hydrogen production system for the transportation and industrial market (1,000 to 5,000 standard cubic feet per hour [scfh]). 

Further develop an existing small-scale (1,000 standard cubic feet per hour [scfh] H2) natural gas-based autothermal reformer (ATR) prototype and test in conjunction with pressure swing adsorption (PSA) for on-site production of hydrogen... 

Explain the meaning of 37.5 SCFH (37.5 standard cubic feet per hour) and what it means to say that the flow rate of a gas stream at 120°F and 2.8 atm is 37.5 SCFH. (Why doesn t this statement specify the impossible condition that the gas is at two sets of temperatures and pressures simultaneously ) Calculate the true volumetric flow rate of that gas. 

Saturated propane vapor at 2.00 x 10 psia is fed to a well-insulated heat exchanger at a rate of 3.00 X 10 SCFH (standard cubic feet per hour). The propane leaves the exchanger as a saturated liquid (i.e., a liquid at its boiling point) at the same pressure. Cooling water enters the exchanger at 70°F. flowing cocurrently in the same direction) with the propane. The temperature difference between the outlet streams (liquid propane and water) is 15°F. 

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