On average Detroit's firefighters, police officers and other city employees receive pension checks that are similar or slightly smaller in size than the national average of $30,000 a year, according to pension experts.
Steam-Methane Reforming. Most hydrogen produced today in the United States is made via steam-methane reforming, a mature production process in which high-temperature steam (700Â°Câ1,000Â°C) is used to produce hydrogen from a methane source, such as natural gas.
The principle of energy conservation states that the total energy in the lower-pressure state must equal the total energy in the higher-pressure state. 1  Therefore, the amount of heat in the flash steam and condensate must equal that in the initial condensate of 671 kJ. Steam tables give the following information: 1  Total enthalpy of saturated water at atmospheric pressure (hf) = 419 kJ/kg. 2  Total enthalpy in saturated steam at atmospheric pressure (hg) = 2 675 kJ/kg. 3  Therefore, at the lower pressure state of 0 bar g. 4  Total enthalpy in the water = 0.888 kg x 419 kJ / kg = 372 kJ (A)