Gases applications

Sealing of turboexpander and compressor process gas from die bearing housing differs for air separation and natural gas applications. The bearing housing is usually sealed in cold expanders and for cases when die process gas contains heavy hydrocarbon components, which may cause condensation in die bearing housing. 

Materials for Usual Construction of Components for Process Type Gas Applications... 

Evans, T. E., Mechanisms of Cathodic Protection in Seawater . In Cathodic Protection Theory and Practice, 2nd International Conference, Stratford-upon-Avon, June (1989) Choate, D. L., Kochanezyk, R. W. and Lunden, K. C., Developments in Cathodic Protection Design and Maintenance for Marine Struaures and Pipelines , NACE Conference on Engineering Solutions for Corrosion in Oil and Gas Applications, Milan, Italy, November (1989) not included in Proceedings... 

Biomass gasification offers the potential for producing a fuel gas that can be used for power generation system or synthesis gas applications. The volatile matter contains a considerable amount of tar which is a complex mixture of aromatics. Despite extensive research efforts tar formation which causes the pipe plugging and the reduction of conversion efficiency is still a major problem in biomass gasification systems [1-6]. 

The presence of alkali salts may create other problems even in systems where deposition of hot vapors is not an issue. Alkali salts can be corrosive to metal surfaces and can poison catalysts such as those in tar cracking and synthesis gas applications. 

Stripping with steam, air or under vacuum (followed by a further treatment of the stripping gas). Applicable to volatile pollutants... 

For each chromosome (variable subset), a so-called fitness (response, objective function) has to be determined, which in the case of variable selection is a performance measure of the model created from this variable subset. In most GA applications, only fit-criteria that consider the number of variables are used (AIC, BIC, adjusted R2, etc.) together with fast OLS regression and fast leave-one-out CV (see Section 4.3.2). Rarely, more powerful evaluation schemes are applied (Leardi 1994). 

Noninvasive glucose measurements can potentially be performed with phase-modulation fluorometry. The blood gas application described above requires drawing the blood, i.e., an invasive as well as an unpleasant procedure. Similarly, present measurements of blood glucose also require fresh blood. Insulin-dependent diabetics... 

Compressors in process gas applications suffer from many problems. The following are some of the major categories in which these problems... 

This vessel can remove 100% of all particles larger than about 2 microns and 99% of those down to about 0.5 micron. Filter separators are commonly used on compressor inlets in field compressor stations, as final scrubbers upstream of gylcol contact towers and in instrument. fuel gas applications. Design is proprietary and dependent upon type of filter element employed. 

One important class of point-of-use processes utilizes a porous polymer containing reactive metals. Variations in the metal and polymer chemistry are made to optimize the process for different gas applications. This is an active area of development and purifiers are available for most of the principal... 

This paper points out important criteria for an efficient mass transfer packing. Also described is a new PVC packing for use in water/air or water/gas applications such as cooling towers. 4 refs, cited. 

Types of SCR Catalysts. The catalysts used in the SCR were initially formed into spherical shapes that were placed either in fixed-bed reactors for clean gas applications or moving-bed reactors where dust was present. The moving-bed reactors added complexity to the design and in some applications resulted in unacceptable catalyst abrasion. As of 1993 most SCR catalysts are either supported on a ceramic or metallic honeycomb or are directly extruded as a honeycomb (1). A typical honeycomb block has face dimensions of 150 by 150 mm and can be as long as one meter. The number of cells per block varies... 

The benefits of GA applications to lemons are a more desirable seasonal harvest pattern in relation to market demands, a larger percentage of fruit with a long storage life, and a decrease in the number of small fruit (6). Applications of GA to Clementine mandarins significantly delayed fruit coloring, loss of acid, and an increase in soluble solids (40). 

The second type of hollow fiber module is the bore-side feed type illustrated in Figure 3.46(b). The fibers in this type of unit are open at both ends, and the feed fluid is circulated through the bore of the fibers. To minimize pressure drop inside the fibers, the diameters are usually larger than those of the fine fibers used in the shell-side feed system and are generally made by solution spinning. These so-called capillary fibers are used in ultrafiltration, pervaporation, and some low-to medium-pressure gas applications. Feed pressures are usually limited to below 150 psig in this type of module. 

Light hydrocarbons from nitrogen or hydrogen Reactor purge gas, petrochemical process streams, refinery waste gas Application is expanding rapidly... 

There is a coefficient for gas applications and one for liqub applications, whbh usually varies among valve types. 

Sour gas applications Here, NACE recommendations (see Section 4.4) should be followed. Most wrought grades are acceptable to NACE. Therefore, in general, duplex valves with bar stock nozzles and discs will meet NACE requirements. Some limited cast grades will generally comply also ... 

Test report valve could be tested on liquid and Test on correct medium, used in gas application ... 

The above relationship predicts a monotonic increase in p with increasing temperature as shown in Figure 3 for three different gases. Hence, the maximum amount of gas (by the Gibbs definition) adsorbed on the surface of the adsorbent can be attained at a lower pressure by operating close to the critical temperature of the adsorbed gas. Application of even higher pressures then p will result in a large increase in the... 

Bejan, A., "The Concept of Irreversibility in Heat Exchanger Design Counter-flow Heat Exchangers for Gas-to-Gas Applications," Trans. ASME J. Heat Transfer, 99, 374 (1977). 

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