A cyclonic chiller-separator, including a vertically oriented treatment tower defining an interior space and having an exhaust inlet disposed in an upper portion, and a chimney with an exhaust outlet; an exhaust stream conduit in fluid communication with said interior volume of said treatment tower through said exhaust inlet, wherein said exhaust inlet is configured to induce cyclonic fluid motion in an exhaust stream entering said interior volume; a coolant water source; and a plurality of nozzles disposed about interior walls of said treatment tower and in fluid communication with said coolant water source for spraying cooling water into said interior volume above and into an exhaust stream introduced into said interior volume so as to cool, condense, and precipitate volatile organic compounds and organic acids, and to entrain and remove particulates from the exhaust stream.

A swirl air/liquid air purifier comprises: a liquid accommodating disk, having a liquid accommodating space formed in a recessed status for accommodating a liquid; an air discharging pipe, disposed at a top end of the liquid accommodating disk and upwardly extended so as to be formed as a hollow body, wherein a bottom end thereof has a bottom base which is sealed at the top end of the liquid accommodating disk, the bottom base is formed with a plurality of air inlet holes arranged adjacent to a periphery of the air discharging pipe, one side of the air inlet hole is downwardly extended and obliquely inclined thereby forming an inclined guiding plate/pipe allowing a swirl airflow to be generated; and an air suction fan, disposed in the air discharging pipe.

An improved air scrubber has an improved, more efficient, more robust impeller and impeller housing for mixing incoming air with water, scrubbing the air with increased efficiency and lower mean time between failures. Also water flow through the system is improved to prevent loss of scrubbing performance and to reduce user workload. In addition to these improvements, the water intake system has been redesigned to use less water, prevent using too much water, and to prevent previously common errors that require users to drain water from the impeller housing.

The device (1) for bringing a gas and a liquid into contact includes an enclosure (E), first means (5) for introducing into the enclosure and circulating therein a gas stream (G), second means (6) for introducing into the enclosure and circulating therein a liquid stream (L) that circulates inside the enclosure (E) in the same direction as the gas stream (G), and means (4A) for mixing the gas stream (G) and the liquid stream (L). These mixing means (4A) are positioned inside the enclosure (E) in the path of the gas stream and liquid stream and are capable of locally deflecting upward, and/or of locally causing to rise, at least one portion of the gas stream and liquid stream, so as to locally create turbulences in the gas stream and in the liquid stream.

A multi-mechanism wet dust removal apparatus that circulates water and removes ambient dust, and a dust removal method. The multi-mechanism wet dust removal apparatus includes a dust collecting device, a dust settling and air-water separation device, a water circulating device, and a dust discharging device. The dust removal is achieved by dust collecting, dust settling, air-water separation and dust discharging. Water can be recycled and the dust removal method integrates multiple dust removal mechanisms.

Embodiments of a system and a method for preparing mold-resistant paper comprising a wet scrubber assembly in fluid communication with at least one collection plenum disposed at an operational area of a paper manufacturing line. The wet scrubber assembly can be operated to draw a stream of exhaust air from the operational area of the paper manufacturing line through the wet scrubber assembly to remove particulate from the exhaust stream. Such systems and methods can be used to produce mold-resistant paper by coating a paper with an antimicrobial composition including at least one antimicrobial additive at the calendering stage. The collection plenum can be placed in proximate relationship with the calendering stack such that the amount of antimicrobial additive particulate in the air at the calendering stage is reduced. The mold-resistant paper can be used in a gypsum panel.

A filtering module includes a cyclone having a contaminated air inlet part into which external contaminated air and cleaning water cleaning the contaminated air are each introduced, and a cleaned air outlet part through which air cleaned by bringing the cleaning water into contact with the contaminated air is discharged; a water tank coupled to the cyclone, to which the cleaning water cleaning the contaminated air is introduced, and storing mixed water in which a pre-stored fluid and the cleaning water are mixed; and a fluid circulating part providing the mixed water stored in the water tank to the contaminated air inlet part.

A swirl air/liquid air purifier comprises: a liquid accommodating disk, having a liquid accommodating space formed in a recessed status for accommodating a liquid; an air discharging pipe, disposed at a top end of the liquid accommodating disk and upwardly extended so as to be formed as a hollow body, wherein a bottom end thereof has a bottom base which is sealed at the top end of the liquid accommodating disk, the bottom base is formed with a plurality of air inlet holes arranged adjacent to a periphery of the air discharging pipe, one side of the air inlet hole is downwardly extended and obliquely inclined thereby forming an inclined guiding plate/pipe allowing a swirl airflow to be generated; and an air suction fan, disposed in the air discharging pipe.

A clean-air filtration system has a main pipe with an entry for attaching to an exhaust source and an exit. The main pipe has a plurality of openings for dispersing water within the main pipe. A water source is connected to the main pipe and supplying water to the openings. A particulate interceptor is connected to the main pipe for removing particulates from an exhaust flow. A particulate storage unit is connected to the particulate interceptor.

An integrated process for production of urea and urea-ammonium sulphate (UAS) comprises: a urea synthesis step carried out in a urea synthesis reactor; a recovery and concentration step, wherein a urea solution produced in the urea synthesis step is progressively concentrated in at least one recovery section and in a concentration section, recovering unreacted ammonia and carbon dioxide and water from said urea solution; a step of producing ammonium sulphate by reaction of sulphuric acid and ammonia in an ammonium sulphate production apparatus; a step of mixing said ammonium sulphate with concentrated urea coming from the concentration section to produce a UAS mixture; in the ammonium sulphate production step, at least a part of the ammonia is provided by at least one off-gas containing ammonia and recovered from the recovery and concentration step.