Central station plant

Water need not be stored within the unit this is often the case where the equipment used for humidification forms part of a central station plant or where a suitable source of steam is available. 

In the committee s analysis, central station plants are assumed to produce hydrogen on average 1,080,000 kilograms per day (kg/d) midsize plants, 21,600 kg/d and distributed facilities, 432 kg/d. (See Chapter 5.)... 

The estimates presented here are developed at three different scales of hydrogen generation, referred to as central station (CS), midsize (MS), and distributed (Dist). Central station plants are assumed to have a production capacity of... 

These production capacities correspond to 497,400,000 standard cubic feet per day (scf/d) for the central station plants and 9,948,000 scf/d for the midsize plants. 

Central station plant Midsize plant Distributed Steam reforming Steam reforming Steam reforming Gasifier Thermal splitting of water Gasifier or direct conversion Electrolysis Electrolysis Electrolysis... 

Finding 5-1. Hydrogen from central station plant natural gas or coal, used in fuel cell vehicles, can be roughly cost-equivalent to gasoline in a hybrid electric vehicle, on a gasoline-efficiency-adjusted (GEA) basis. For natural gas and coal, the differences between current and possible future technologies are relatively small, in comparison to the committee s estimation accuracy. 

Because of its small size, the reactor containment structure is located within a reactor service building. The general layout of systems and equipment within the reactor service building is as shown in Figures 1,2, and 3 with critical reactor auxiliary equipment placed near the reactor. Radwaste systems and equipment are situated at one end of the reactor service building away from the reactor. Large, heavy equipment is placed on the bottom floor elevation, while lighter equipment is located on the upper elevations. The system layouts are based on past experience with central station plants. 

For central station power generation the open cycle system using electrically conducting coal combustion products as the working fluid is employed. The fuel typically is pulverized coal burned directly in the MHD combustor, although in some plant designs cleaner fuels made from coal by gasification or by beneficiation have been considered (8—10) (see Fuels, synthetic). 

FIG. 17-69 Design curves for electrostatic precipitators for fly ash. Collection efficiency for various levels of percent sulfur in coal versus a) specific collecting surface, and (h) bus sections per 100,000 ftVmin (4.7 mVs). °C = (°F — 32) X (Ramsdell, Design Criteria for Precipitators for Modern Central Station Power Plants, Amen c m Power Conference, Chicago, III., 1968. )... 

In all vacuum processes the pressure in the system must be constantly checked and, if necessary, regulated. Modern plant control additionally requires that all measured values w/hich are important for monitoring a plant are transmitted to central stations, monitoring and control centers and compiled in a clear manner. Pressure changes are frequently recorded over time by recording equipment. This means that additional demands are placed on vacuum gauges ... 

There are two product lines leaving each GC -the oil transit line which supplies the Trans Alaska Pipeline System (TAPS) Pump Station II, and the gas transit line which sends gas to the Central Compression Plant for reinjection to the reservoir gas cap. 

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