Temperature inlet gas

Efficiency increases with an increase in the inlet-gas temperature for a constant exhaust temperature. 

Countercurrent flow of gas and sohds gives greater heat-transfer efficiency with a given inlet-gas temperature. But cocurrent flow can be used more frequently to diy heat-sensitive materials at higher inlet-gas temperatures because of the rapid coohng of the gas during initial evaporation of surface moisture. 

The conveyor and collector parts are thoroughly insulated to reduce heat losses in diying and other heating operations. Operating control is maintained usually by control of the exit-gas temperature, with the inlet-gas temperature varied to compensate for changing feed conditions. A constant solids feed rate must be maintained. 

The proposed advanced PFBC cycle will permit a turbine inlet gas temperature of over 1535 K (2300°F) by burning a fuel gas produced by pyrolysis of the coal feed. Because the turbine fuel gas must be practicaUy particulate free, it passes through HTHP filters before combustion. The char residue from the pyrolyzer may be burned in a circulating AFBC or PFBC to produce steam for power or heating. The efficiency attainable in an advanced PFBC plant may be as hi as 50 percent (HHV basis). 

Consider the sensitivity of TTE to four process gas normal design condition parameters inlet gas pressure (P ), inlet gas temperature (Tj), gas mass flow (M), and gas molecular weight (MW). 

The temperature of the lean amine solution entering the absorber should be about 10°F higher than the inlet gas temperature to prevent hydrocarbon condensation and subsequent foaming. 

If the outlet gas temperature from the absorber exceeds the inlet gas temperature more than 20 to 30°F, the lean glycol entering the top of the absorber may be too hot. This could indicate a heat exchanger problem or an excessive glycol circulation rate. 

If I ever have to design an amine plant I will know, for example, that the temperature of the lean amine solution entering the absorber should be about 10°F higher than the inlet gas temperature to prevent hydrocarbon condensation and subsequent foaming, that the reboiler tube bundle should be placed on a slide about six inches above the bottom of the shell to provide good circulation, that about two percent of the total circulating flow should pass through the carbon towers, and many other necessary requirements. 

Difference is defined as inlet gas temperature minus inlet cooling water temperature. Soiirt, [I] Reprinted by permission of the American Society of Mechanical Engineer ... 

Temperature-. Inlet gas temperatures are only limited by the materials of construction of the settling chamber, and have been operated at temperatures as high as 540°C (1000°F) (Wark, 1981 Perry, 1984). 

Temperature and Humidity When adsorption, absorption, or condensation is employed, the lowest inlet gas temperature is desirable. Adsorbent and absorbent capacities generally increase with the decreasing gas temperature. High waste-gas temperatures may preclude the use of adsorption or condensatit)n due to the cost of chilling. Thermal and catalytic oxidation benefit from a hot effluent gas stream, as that reduces the supplementary fuel requirement. In biological treatment, a waste-gas temperature of near 37 °C is ideal. 

In any particular cycle calculation, with the inlet gas temperature known together with the inlet coolant temperature Tcj, and with an assumed allowable metal temperature Tb), E() was determined from Eq. (A7). W" was then obtained from Eq. (A 18) and the cooling flow fraction i/ from Eq. (A16). 

The hot lean amine proceeds to the rich/lean amine exchanger and then to additional coolers to lower its temperature to no less than 10°F above the inlet gas temperature. This prevents hydrocarbons from con-... 

At constant pressure, the water content of the inlet gas increases as the inlet gas temperature increases. For example, at 1.000 psia and SO F gas holds about 34 Ib/MMscf, while at 1,000 psia and 120 it will hold about 104 Ib/MMscf. At the higher temperature, the glycol will have to... 

Inlet gas temperatures above 120°F result in high triethylene glscol losses. At higher gas temperatures tetraethylene glycol can be used, but it is more common to cool the gas below 120 F before entering the contactor. The more the gas is cooled, while staying above the hydrate formation temperature, the smaller the glycol unit required. 

Gas cooler (67°F HjO) 17.6 13.3 14.6 Lower heat duty inlet gas temperature than used in calculations. 

In calculating the smoke tube inlet gas temperature of a shell boiler, A includes the effective water-cooled surface in the reversal chamber. In coal-fired boilers, any water-cooled surface below the grate is excluded from A. 

L15 For a two-stage adiabatic compressor where the gas is cooled to the inlet gas temperature between stages, the theoretical work is given by... 

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