Metric tons per hour

Pusher centrifuges require high feed concentrations to enable the formation of a sufficiently rigid cake to transmit the thmst of the piston. The diameters vary from 150 to 1400 mm, the stroke frequency from 20 to 100 strokes per minute, and the soHds handling capacities up to 40 metric tons per hour or more. 

Generally, as the product size becomes finer, the capacity of the separating device decreases. Thus, there are devices that can be fed hundreds of metric tons per hour (MTPH) and produce a 95% passing 50-p.m product but a device that produces 95% passing 5 p.m may have a capacity of ca 1 MTPH or less. 

Fig. 9. Schematic steam balance where the numbers represent steam flows in metric tons per hour. See Table 3.

Table 3. Steam Balance, Flows in Metric Tons per Hour ...

Objective Determine the filter size and vacuum system capacity required to dewater 15 mtph (metric tons per hour) of dry sohds and produce a cake containing an average moisture content of 25 wt %. 

T pe of particle charging Feed Separation T pe of separator Feed temperature, °C Feed. size, mm Feed rate, metric tons per hour per start d No. of stages of separation... 

To convert metric tons per hour per start to kilograms per second per start, miiltiplv l)v 0.2778. 

Fairfield Engineering Co. data in U.S. customary system. To convert cubic feet per hour to cubic meters per hour, multiply by 0.02832 to convert tons per hour to metric tons per hour, multiply by 0.9078 and to convert screw size in inches to the nearest screw size in centimeters, multiply by 2.5. 

Currently, a small pilot-scale study is under way, and a 2-ton (1.8-metric ton) per hour commercial demonstration is under design for treating soils contaminated with hydrocarbons or hazardous organic residues. This technology is not yet commercially available, and Recol Engineering, Ltd., is interested in pursuing joint ventures or demonstration projects. 

Mobilization and demobilization costs for the 10-ton (9-metric-ton) per hour SoilTech system range from 700,000 to 1.5 million (D12494H, p. 216). 

An example of a modem, tangentially fired, supercritical, lignite-fuel furnace is shown in Figure 5. This unit, at maximum continuous ratings, supplies 2450 metric tons per hour superheat steam at 26.6 MPa (3850 psi) and 544°C, and 2160 t/h reheat steam at 5.32 MPa (772 psi) and 541°C. These are the values at the superheater and reheater outlet, respectively. Supercritical fluid-pressure installations are, however, only rarely needed. Most power plants operate at subcritical pressures in the range of 12.4—19.3 MPa (1800—2800 psi). 

As an example, a process with 1000 1/h (equal to approximately 1 metric ton per hour) and a speed of 400/min would result in a minimum extruder diameter of 60 mm. 

Determine the minimum increment weight for a powder falling from a belt conveyer at a rate of 3 metric tons per hour if the size of the largest particle is 1.0 mm and the sampling cutter speed is 6 cm s . 

Optimize the design of a distillation column to separate 225 metric tons per hour of an equimolar mixture of benzene, toluene, ethylbenzene, paraxylene, and orthoxylene with minimum total annualized cost. The feed is a saturated liquid at 330 kPa. The recovery of toluene in the distillate should be greater than 99%, and the recovery of ethylbenzene in the bottoms should be greater than 99%. 

The first step is to determine the design factor. If we assume a design factor of 10%, then the equipment should be designed for a flow rate of 248 metric tons per hour... 

Since we are now sizing the column, the first step is to increase the flow rate to allow for a design factor. The process design basis is 225 metric tons per hour of feed. The equipment design should include at least a 10% safety factor, so the equipment design basis was set at 250 metric tons per hour of feed (rounding up from 247.5 for convenience). 

A 5 HP hammermill rated at 9 kg/hr was used to shred recycled newsprint. The shredded newspaper was densified with a John Deere Model 390 stationary Cuber rated at 4.3 metric tons per hour. Since the gasifier and shredder used in the experiments only have a capacity of 23kg/hr and 9kg/hr., respectively, an obvious mismatch exists in the... 

Storage, handling, blending, and coal blend plastification Figures 403(a) to (e) show the layout of a typical coal briquetting system for a production capacity of 60-70 metric tons per hour with two roller presses. A plant using pitch or similar thermoplastic binder is depicted. 

Steam production is shown in pounds per hour as well as metric tons per hour. The price is shown per unit of steam production in U.S. dollars. The curves are based on an operating pressure of 650 psig. Correction factors are shown in Table 1-3 for other steam pressures. Also included in Table 1-3 is a factor for the use of an air preheater and a two boiler cost factor. 

Price curves show that the package boiler has an obvious price advantage. Up to boiler outputs of 220,000 Ibs./hr. (100 metric tons per hour) the price difference is significant between a package and a field-erected boiler of equal capacity. This is a major reason why the package boiler is finding an expanding market. 

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