Showing papers on "Spray tower published in 1998"

Aqueous absorption of nitric oxide induced by sodium chlorite oxidation in the presence of sulfur dioxide

Abstract: The absorption of NO from a gas stream containing SO{sub 2} by aqueous solution of NaClO{sub 2} was studied in a bench scale scrubber. NO{sub x} removal of up to 95% was obtained using a packed bed scrubber. The corresponding SO{sub 2} removals were 100%. Experiments were also conducted in a bubble column and a spray chamber scrubber in order to obtain engineering data for scale-up and process design. A novel UV/Vis photodiode array (PDA) method was developed for real-time monitoring of oxychlorine compounds in the scrubbing solutions. As a consequence of the data obtained with the PDA system, a much better understanding of the chemistry of the scrubbing system has led to a simpler mass transfer model than is available in the literature. Absorption rates are reported in terms of overall reaction rates for a spray chamber scrubber and height of transfer units for a packed bed scrubber.

Dehumidification of Air by Aqueous Triethylene Glycol Solution in a Spray Tower

Abstract: A spray tower in the absorber-stripper system has been designed to study the absorption of water vapor from moist air by contact with aqueous solutions that contained from 87.7 to 95.2% triethylene glycol (TEG). The design of a “U-shape” air tunnel with eliminators in the absorber and stripper is to prevent the carryover of the solution and to increase the absorption rate and the regeneration rate. This spray tower was capable of handling air flow rates from 1.94 to 3.77 kg/min and liquid flow rates from 2.17 to 3.31 kg/min. Under the operating conditions of this study, the overall mass transfer coefficients calculated from the experimental data of 95.2% TEG solution varied from 1.78 to 2.95 mol/m3s. These corresponded to the heights of a transfer unit of 0.63 to 0.38 m, respectively. The efficiencies of the spray tower typically varied from 64 to 86/.

Gas-liquid contactor with liquid redistribution device

Abstract: A gas-liquid contactor for removing gases and particulate matter from flue gases produced by processing operations of the type carried out in utility and industrial plants The contactor is generally an open spray absorber having a spray tower (110) whose walls (114) form a passage within the tower (110) Flue gases are introduced into the tower (110) so as to flow vertically upward or downward through the passage Disposed within the passage are heads (116) for introducing a liquid (118) into the passage such that the liquid (118) contacts the flue gases A portion of the liquid (118) contacts the wall (114) of the tower (110), such that the portion of the liquid (118) flows downwardly along the wall (114) The tower (110) is equipped with a deflecting device (122) disposed on the wall (114) for deflecting the portion of the liquid (118) away from the wall (114), and thereafter reintroducing the portion of the liquid (118) into the passage so as to contact the gases flowing through the passage The deflecting device (122) is also preferably configured to obstruct the flow of gases along the wall (114) in order to reduce gas penetration at the wall (114) and divert the gases toward the center of the passage where more efficient contact with the liquid (118) is made

Purifying method of waste gas at incinerator and device therefor

Abstract: PROBLEM TO BE SOLVED: To surely remove and adsorb a harmful component in a waste gas generated by incinerating various wastes to discharge the waste gas to the atmosphere in a clean state and to convert the adsorbed harmful component to a harmless slug and to reuse the harmless slug as a civil/building material, etc. SOLUTION: In a spray tower 40 to which the waste gas is introduced, the waste gas is washed with a shower liq. to which an adsorbent is incorporated, and the harmful component is adsorbed onto the adsorbent by passing the shower liq. through in order each falling hole 52, (55), 57 and (59) of plural weir plates 51, 53, 56 and 58, and the harmful component is separated and removed by filtering. A shower pipe 47 spraying the shower liq. and the plural weir plates 51, 53, 56 and 58 in which many falling holes 52, (55), 57 and (59) which become gradually small size in accordance to reach a lower direction are bored and which are arranged in steps are provided respectively in the spray tower 40, and a blower 65 discharging a pure waste gas in the spray tower 40 to outside and a filter device 66 filtering the shower waste liq. discharged from a discharge port 45 and separating and removing the harmful component are provided.

The influence of spraying angle on aerodynamic characteristics of FGD spray towers

Abstract: A model for aerodynamic characteristics predictions of flue gas desulfurization scrubber was developed. Droplets motion was considered as two-dimensional and initial droplets velocity and spraying angle were assumed as parameters. The presented model is able to predict pressure drop caused by the presence of spray, local dispersed phase concentration and droplets residence time for co- or counter-current apparatus. The results obtained for constant initial, vertical component of droplets velocity were compared to those evaluated for constant initial drops velocity (module). A range of applicability of one-dimensional model developed only for vertical drops motion is given.

Design of a spray-cycle bioreactor and its application for riboflavin production

Abstract: A highly efficient spray-cycle reactor for oxygen supply was developed. A typical arrangement of the reactor consists of a spray column fitted with a nozzle and a coaxal tube, and a reservoir vessel. The culture broth was circulated between the column and vessel by a peristaltic pump. The volumetric oxygen-transfer coefficient, k1a was evaluated as a parameter for oxygen supply. The liquid circulation rate in the spraycycle reactor was represented in terms of the number of circulations. The k1a value increased as the number of circulations increased, reaching 208 h-1 at 4.4 min-1 of circulation numbers. This value was 1.8 times higher than that in a 1500-mL stirred-tank reactor under the agitation of 20.7g and the aeration of 1.0 volume per min.

Unit for treating exhaust gas

Abstract: The utility model relates to a unit for treating exhaust gas. The utility model uses liquid for removing harmful ingredients in exhaust gas. The unit for treating exhaust gas comprises a spray tower, a water reservoir used for providing aqueous alkali for the spray tower, a circulating pump, and a filter corresponding to the bottom of the spray tower. A refrigeration system is cancelled. The utility model has the advantages of simple structure and low cost.