Single nozzle head

The vapor outlet is usually a vertical nozzle located on the top head of the tower. It is usually a single nozzle, but in certain cases (e.g., towers with very large diameters), more than one nozzle is specified. On large-diameter vapor lines, the vessel connection could be butt-welded instead of flanged. In addition, the vent and relief valve could be located on the top head instead of attached to the overhead piping. Exhibit 10-32 shows a typical top head arrangement. 

Another important feature of nozzles for the manufacture of engineering plastics is the homogeneity of the temperature profile across the nozzle length. Particular value must be placed on this requirement when processing melts with a small process window. In the single-nozzle variant, an optimal temperature profile is achieved by additional heat conduction in the nozzle head. 

Fig. 6.14 Left. Sketch of the HiDrip droplet generator nozzle head (a) servomotor drive, (b) adjusting thread for sealing between (c) and (d), (c) multiple-hole cutter disc, and (d) single-hole nozzle plate. Right. Sketch of the experimental setup for binary drop collision. The colUsion velocities are varied by adjusting the angle between the two streams of drops...

Figure 3.25 shows the process flow. Before being coated, the substrate is abraded by a laser, a jet of sand, or a pulverized metal abrasive to structure the surface. In the Flamecon process as such, metal particles of the preferred coating material are injected into a hot chamber by a high-precision metering unit. The particles are melted and jetted under computer control in a stream of carrier gas to the nozzle head, which applies the plasma to the substrate. Both processes can be integrated in a single step. Width and thickness of the conductive structures can be parameterized [170]. 

In these equations, C is the humidifier solids concentration in ppm, Q is the total air-conditioned flow rate in CFM, F is the total, single path penetration efficiency of the air-handling equipment, p is the density of water (= Igm/cm ), GPM is the humidifier flow rate in gallons per minute, N is the number of humidifier nozzles or heads, W is the weight rate in pounds per hour emitted by each humidifier unit, and x, as above in Equation 3, is the humidifier on-time fraction. 

Dtisen-Schlick, GmbH, Dresden, Germany). The 970 series is typically found in laboratory inserts, the 940 series, also a single-headed nozzle, is used in pilot scale machines, and the 937 is a three-headed nozzle, typically fitted in production equipment. In very large machines, multiple wands may be used with several multi-headed nozzles to spread the liquid over as much of the fluidizing product bed surface area as possible (typically to improve productivity). 

Increased number of spray guns (or change from a single- to a multiple-head nozzle)... 

They do allow single-tube pass design if fitted with a rear head tnbe-side nozzle and flexible piping. Individual tube replacement is possible. 

Held in place by the head assembly is an adapter, which guides the melt stream from the barrel exit into the die entrance. There may be a fixed nozzle in the head, which can be fitted with a custom adapter for each die employed. For the best temperature control, the nozzle and adapter should each have their own heater band. Usually a single temperature control circuit is used for the nozzle/adapter zone, but for a long transfer pipe to the die, multiple circuits maybe necessary. 

The reactor vessel is a pressure vessel with a single full-diameter removable head. The base material of the vessel is low alloy steel, which is clad on the interior except for nozzles with stainless steel weld overlay to provide the necessary resistance to corrosion. Since the vessel head is exposed to a saturated steam environment throughout its operating lifetime, stainless steel cladding is not used over its interior surfaces. 

Hot sodium enters the SG vessel through four, vertical, sodium inlet nozzles on the upper head into four distributors. The sodium flows past the partially shielded steam outlet tubes and into the free flow area around the helical coil tube bundle. The colder sodium leaves the bottom of the tube bundle, then flows through a single sodium outlet nozzle located in the center of the lower ellipsoidal head, beyond which the two cold leg pipes attach laterally and still downstream is the SWRPRS. 

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