Showing papers on "Spray tower published in 1981"

Removing method for sulfur dioxide in waste gas

Abstract: PURPOSE: To remove the sulfur dioxide in waste gases effectively with combination of a tray tower and a spray tower in the stage of removing the sulfur dioxide from the waste gases by using the tray tower first then the spray tower. CONSTITUTION: Waste gases contg. sulfur dioxide are first conducted through a line 3 into a tray tower 1, where the gases are brought into contact with the absorbing liquid from a line 11, whereby 60W90% the sulfur dioxide to be removed is removed. Then the waste gases are conducted through a line 5 into a spray tower 2, where the flow of the gases is regulated with flow regulating plates 6 and the gases are brought into counter current contact with the absorbing liquid from spray nozzles 7, whereby the sulfur dioxide is removed. Thus the tray tower is used when the concn. is high and said tower is used in combination with the spray when the concn. is low, whereby the short paths in the spray tower are prevented and the sulfur dioxide is removed effectively in high yields. COPYRIGHT: (C)1983,JPO&Japio

Method and apparatus for removal of heat from an olefin polymerization reactor

Abstract: In polymerizing a C2 to C8 olefin, in a polymerization reactor with a reflux condenser, a gas mixture withdrawn from the polymerization reactor is first washed before it reaches the heat transfer surface of the reflux condenser to remove active catalyst particles and polymer particles entrained therein and then condensed to obtain a condensed liquid, and the condensed liquid is returned to the polymerization reactor whereby the heat generated in the polymerization reactor is efficiently removed without causing any clogging of pipes. The washing means is a gas-liquid contacter such as a sieve tray, turbogrid tray, ripple tray, pibo disc scrubber, cyclone scrubber or spray tower and can be in the lower portion of the condenser. The washing is preferably by countercurrent contact of the gas mixture with condensed liquid obtained in the condenser and/or solvent.

Minnesota Power’s Operating Experience with Integrated Particulate and SO2 Scrubbing

Abstract: Minnesota Power currently has in commercial operation a 500 MW gas cleaning system consisting of a venturi particulate scrubber, integrated with a spray tower SO2 absorber. The system was designed to achieve 99.7% particulate removal and 90% SO2 removal based upon burning a 2.8 % sulfur coal. Initially the concept of using a venturi for wet particulate collection was selected based upon a significant cost saving of $25 million compared to dry particulate collection devices. Subsequently, the Interaction of particulate collection with SO2 removal provided additional operating cost benefits. Prior to start-up of the commercial system, a pilot plant was used to evaluate various modes of operation. Results showed that alkali contained in the fly ash removed with the venturi was sufficient to meet the alkali requirement for SO2 removal. Clay Boswell Station Unit No. 4 was started up during March 1980. Since initial start-up the system has exhibited almost 100% availability. EPA compliance testing has confirmed...

Treatment of waste gas from incinerator

Abstract: PURPOSE:To remove hydrogen chloride of any concentration without producing waste water by a method wherein waste gas is subjected to a specific treatment with an aqueous alkaline solution, then an electric dust precipitator is used to remove alkali chlorides from the waste gas. CONSTITUTION:Hot waste gas 1 containing hydrogen chloride is guided in the spray tower 2, and an aqueous alkaline solution 3 is sprayed from th top of the tower 2. After removing the specified amount of hydrogen chloride in the spray tower 2, the waste gas is guided to the wet-wall tower 5 and brought into contact with an aqueous alkaline solution 7 so that the gas is treated until the concentration of hydrogen chloride in the waste gas reaches the specified value. Next, the waste gas is introduced into the electric dust precipitator 6 so as to remove alkali chlorides and dust contained in the gas, and dust-free gas is discharged to the air. Preferably, the alkaline solution used in the wet-wall tower is adjusted in its concentration and used for spraying in the spray tower.