Turbine mixing heads

A turbine mixing head patented by ICI in 1955 [1, 2] enabled polyethylene pipe manufacturers to meet appropriate pipe standards when feeding pellet blends of natural polyethylene and carbon black masterbatch into the pipe extruder. Until then it was necessary to use the more expensive pre-compounded material. The turbine mixers were used by at least two large polyethylene pipe producers until being superseded by CTM, and at a later date, becoming unnecessary in some cases when price distortions and the polymer supply situation produced a switch back to extrusion of pre-compounded materials. 

The turbine mixing heads consisted of alternate sets of fixed and moving teeth made by machining slots around the periphery of round discs externally for the rotor and internally for the stator. The rotor formed a screw extension and the stator a matching barrel extension. 

Turbine Pumps The term Turbine pump is applied to units with mixed-flow (part axial and part centrihigal) impellers. Such units are available in capacities from 20 mVh (100 gal/min) upward for heads up to about 30 m (100 ft) per stage. Turbine pumps are usually vertical. 

Impeller types usually used with mixing and listed in decreasing order of high volume ability (hence in increasing order of high head ability or requirement) are paddle, turbine, propeller, sawtooth impeller or propeller, cut-out impeller disc (no blades), colloid mill. 

Figure 5-5F. Lifter turbine is efficient for pumping large volumes against static heads of less than 36 inches. As shown, It Is used below a draft tube. Inverted, It is used above an orifice plane In tank bottom. Courtesy of Lightnin (formerly Mixing Equipment Co.), a unit of General Signal.

Turbine pumps mix features of a simple propeller (axial flow) pump with a centrifugal pump and are often referred to as units with mixed flow. A simple turbine pump carries curved vanes on a central rotating spindle. Such pumps are often immersed in the liquid and find use in closed-loop circulation systems, in condenser circulating water, and in sumps and wells. Turbine pumps have noteworthy pumping capacity, and like positive displacements pumps are often used for heads up to about 100 ft/stage with capacities of up to several hundred gallons/minute. 

The Vamamo gas turbine is an almost standard ALSTOM Power Typhoon gas turbine, with modified combustors and burners. In brief, the combustor design is based on the conventional diffusion flame principle. The combustor has contra-rotating primary air and fuel addition to promote good shear layer mixing. In addition, a portion of the fuel is injected through plain holes in the burner head to avoid excessive swirl momentum of the fuel gas. 

Design a baffled mixing vessel and a horizontal setder for extraction of benzoic acid from water (diluent) into toluene (solvent). The tank fFigure 13-311 should have H/d ank 1-0 and there should be a 1-inch (0.0254 m) head space (vapor space at top). The flow rate of the aqueous feed is 0.006 m /s, and the volumetric solvent-to-feed ratio = 0.2. A 6-blade flat turbine inpeller with impeller diameter d = 0.25dtank and impeller width w = d/5 is operated at 1000 rpm Sinple setding experiments show that this is a type I (rapid setding) system,... 

The filtered hot and cold tap water was mixed to the desired temperature in a thermostat. For the measurements in the present report the temperature was 20 0. The pure water was led to a constant head overflow tank, which ensures a steady head. The flow rate was measured with a turbine flow rate meter. 

The steam drum is a cylindrical vessel closed at both ends by the hemispherical heads. It incorporates longitudinal partition plates to prevent the mixing of the incoming steam with the sub-cooled feed water. The steam-water mixture (two phases) produced in the reactor core enters the steam drum through the tail pipes at its bottom. The steam separated from the steam-water mixture in four steam drums emerges out through two pipes, each pipe collecting steam from two steam drums. These pipes are connected to the steam chest of the turbine. 

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