Mixing venturi system

In these burners gas flow depends on the underpressure created in a venturi system by the air flow. Fuel and air control is not good and a high excess of air is required. The 6% of CO2 contents means that less than double air compared to stechiometric condition is required. Figure 34.8 gives a rough indication of CO and NO, level reached with this technology. Atmospheric burners are premixed burners because air and fuel are mixed before burning, but "premixed burners" for... 

Each technique has advantages and disadvantages. Packed columns are flexible as the packing can be easily modified for optimisation of each recovery process, but they are best suited to small scale operations. Tray columns are used for large scale, low to medium flow rate applications involving non-corrosive materials. Spray systems are used almost entirely for applications where pressure drop is critical such as flue gas treatment. Types of equipment classified as spray columns include cyclone and venturi systems. Bubble column equipment is a low cost, low maintenance option however back mixing can occur which reduces the counter-current flows required for optimum absorption. 

Venturi Cyclonic. — This system consists of a venturi followed by a cyclonic spray scrubber. A low-pressure pamp circulates scrubber liquid to the venturi where it becomes atomized and thoroughly mixed with the gas by the extremely high velocity in the throat. Gas from the venturi enters the cyclonic scrubber... 

Fig. 5.67 is a view (in direction A-A) of such a mixing chamber which was opened after conveying fine zinc oxide. Opposite the nozzle a deposit in a Venturi-like shape has built up which defines the most effective flow channel at this point. Similar deposits can be found along the line in pneumatic systems that were not optimally designed and/or arranged. 

Venturi scrubbers Water is sprayed into the gases as they pass through a venturi. The acceleration of the gas flow in the venturi throat causes an intensive mixing of both media. The dust particles are damped, making them heavier, so that they can be separated in a cyclone or other system placed downstream. If the gas flow drops, the venturi throat is adjusted to maintain the collection efficiency... 

A majority of applications of venturi loop systems (Table 8.1) pertain to situations in which the gas-phase reactant is a pure gas. Further, the operating pressures are also high ( 1 MPa and above) therefore, partial pressure of the liquid under saturation conditions is also negligible. As a result, back mixing of the gas phase is inconsequential. 

Besides factors that affect the induction rate, the other major factors that affect the gas holdup in venturi loop system are the interaction between the liquid jet and induced gas in the mixing tube and the diverging cone. The effects of the geometries of the individual components of a venturi loop system are discussed in the following. 

DESI), Venturi easy ambient spray ionization (V-EASI), electron ionization (El), and photoionization. These canonical ion sources were adapted for specific purposes in TRMS. Much emphasis was put on mixing reactants, exposing reaction mixtures to fight (in the case of photochemical processes) or electric potentials (in the case of electrochemical processes) (cf. [10]). However, there also exist examples of more exotic systems constracted to enable measurements in the specific niche applications (see, e.g., [11]). Implementation of various interfaces in TRMS systems will be summarized in the following sections. Examples of their applications in different areas of chemistry and biochemistry will be discussed in Chapters 10-13. 

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