Expression equipment

Additional equipment is sometimes integrated vvkth horizontal-belt filters to further devv ater the cake through expression. The addition of such equipment shouldn t be confused with expression equipment that utilizes filter medium belts. Belt type expression equipment is described later in the Expression subsection. 

One saw everywhere in Paris the placards about the "Releve." Three French workers, or two workers, would bring back one prisoner of war. There was a contract between Francolor and Farben about the use of these workers in Germany. The whole thing was absoiutely voluntary. Not only did all of Farben s statements and letters repeat the expression "Equipe de Volontaires" ("team of volunteers"), but the railroad cars carrying the workers were especially decorated. 

Cost Estimation. The capital costing equations used in the cogeneration problem have been designed to yield approximate capital and maintenance expenditures and to reflect the consequence of changing the system s variables on these costs. The form of these equations expresses equipment costs in terms of stream and performance variables. In all cases a capital recovery factor is used to account for the cost of capital (i = 15%) and estimated useful life (n = 40 years). 

Batch Expression Equipment In batch expression equipment, the cake is initially formed by pressure filtration just as in other pressure filters. After the filtration stage, a squeezing device such as a diaphragm is inflated with gas or liquid to compress the cake. Batch expression equipment allows longer compression time and higher compression pressure. The cake can be very dry. 

Tubular presses use the highest pressures among all expression equipment. The pressure can be as nigh as 1500 psi. With the high pressure, the cake can be very dry (> 95 percent dryness). This type of equipment normally has low capacity so multiple units are used. 

Continuous Expression Equipment Continuous ejqiression equipment has the advantage of large capacity and automatic operation. Compared to batch ejqiression equipment, lower pressure is used to squeeze the cake in the continuous ejmression equipment. As a result, the cakes are not as dry as those from the batch eq)ression devices. 

Expression. Both sedimentation and filtration are suitable separation techniques when the mixture of liquid and solids is sufficiently mobile to allow pumping, or similar method of motion, of the fluid to a barrier which retains the solid but not the liquid. If such movement is not possible then separation can be accomplished by compressing the mixture under conditions which permit the liquid to escape while retaining the solid between the compressing surfaces. This technique is called expression. Design of expression equipment is varied. Batch systems usually operate by the application of hydraulic pressure in units such as the box press, pot press, curb press and cage press. Continuous expression utilises equipment such as screw presses, roller mills, and belt presses [23]. 

General recipe A type of tecipe that expresses equipment and site-independent processing requirements (see Fig. VI/3.1.3-1). 

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