Standard cubic feet per hour

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... 

MMBtu/hr = million British thermal units per hour, scfli = standard cubic feet per hour. 

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

Standard cubic feet per minute 60.00 Standard cubic feet per hour... 

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... 

Standard cubic feet per hour of reactable CO converted per lb Fe in reactor 10 12... 

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. 

Abbreviations for standard cubic meters per hour [m (STP)/h], standard liters per hour [L(STP)/h], and standard cubic feet per hour [ t (STP)/h], respectively the volumetric flow rate of a gas stream if the stream were brought from its actual temperature and pressure to standard temperature and pressure (0°C and 1 atm). 

The patentees condua severi experiments to test the feasibility of the process. A continuous process is described in which the catalyst with approximately 40 wt% is placed in a 1" X 12 cylindrical cell and the fatty acid is extracted with supercritical CO2. The extractor is brought to a temperature of 50 to 65 °C, and pressurized to between 2,000 and 4,000 psi. The caiix>n dioxide is allowed to flow through the system at a rate of 8 standard cubic feet per hour until about 60 liters of carbon dioxide passes through the system. At a temperature of 50 °C and a pressure of 2,500 psi, approximately 65 % of the fatty acid was removed from the catalyst. When the temperature was increased to 65 °C at a pressure of 2,500 psi, about 90% of the acid was removed. The use of pressures greater than 2,500 psi did not cause a significant increase in the total percent acid recovered. A separate experiment was conducted in which the catalyst was pretreated with sulfuric acid and subsequently treated with carbon dioxide at 2,500 psi and 65 °C. With this method, about 95 to 97% of the acid could be removed. 

Pi P - The resulting equations for flow in the US units of standard cubic feet per hour are ... 

The historical dominance of US valve manufacturers has led to valve characteristics often being given in standard US units (US gallons, standard cubic feet per hour, etc.). A particularly important influence because of its extensive research into and testing of control valves was the Fisher Controls Company of Marshalltown, Iowa (now part of Fisher-Rosemount Ltd.) This appendix converts the basic liquid-flow equation from US to SI units. The appendix then goes on to derive Fisher s Universal Gas-Sizing Equation ( FUGSE ) from the basic liquid-flow equation and shows how this may be converted into SI units. 

Manufacturers found that equation (A3.1) served well for gas flow at high-pressure ratios as well as for liquid flow. The equation is often quoted with the flow units of standard cubic feet per hour, with the specific gravity standard changed from water to air, which requires the somewhat involved conversion route set down below. The specific gravity with respect to water is related to the specific gravity with respect to air by ... 

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... 

Standard Cubic Feet per Day Standard Cubic Feet per Hour TGC... 

Q = is the volumetric flow rate in dry standard cubic feet per hour (dscf/hr)... 

Temperature = 1326°F, flow rate = 15,000 standard cubic feet per hour (424.75/hr, or 0.089kg/s). 

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