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.

The present invention relates to a method for conditioning a soot-containing syngas stream in a single integrated apparatus containing a scrubbing vessel wherein particulate matter is decoupled from the waste water stream.

A liquid filter apparatus for gas/solid separation includes a housing with a filter chamber, a semiconductor process gas inlet, and a process gas outlet. The filter chamber forms a liquid reservoir, and the semiconductor process gas inlet and the process gas outlet are in communication with the filter chamber. The housing further includes a filter liquid inlet and a filter liquid outlet, which are in communication with the liquid reservoir for delivering and removing filter fluid, respectively, to and from the liquid reservoir.

In an example, a filtration apparatus includes a cyclonic particle separation chamber having an inner surface and a liquid source. The liquid source may be to supply liquid to provide a flow of liquid on the inner surface.

The present invention provides a dust removal system for a chimney of a mixer. The system includes a dust removal water tank and a first pipeline. One end of the first pipeline is communicated with an outlet of the chimney at a tail of the mixer, and the other end is inserted into the dust removal water tank. A water inlet and a water outlet are provided in the dust removal water tank. An exhaust port for discharging filtered gas is provided in an upper part of the dust removal water tank. The system does not need additional power, and is energy-saving and environmentally friendly. Water vapor discharged facilitates the sedimentation of dust particles in the mixer, thereby reducing loss of raw material mixture, making sintering quality more stable and solving a problem that gas discharged in prior arts contains more powder and pollutes the environment.

The present invention relates to a method for conditioning a soot-containing syngas stream in a single integrated apparatus containing a scrubbing vessel wherein particulate matter is decoupled from the waste water stream.

Provided is a dust collection method using a dust collection device. The dust collection method includes: a step of forming a rotating airflow by means of suction with a suction device, the rotating airflow progressing while spiraling along an inner wall surface of a main body; a step of supplying liquid from a supply nozzle; a step of spreading out the liquid with the rotating airflow on the inner wall surface thereby to continuously form a liquid catcher, the liquid catcher rotating as a film of the liquid; and a step of separating smoke and/or dust to outside by centrifugal force due to the rotating airflow and capturing the smoke and/or dust with the liquid catcher, the smoke and/or dust being contained in air introduced to the inside of the main body.

A contaminant reducing device is provided. The contaminant reducing device comprises: an exhaust gas tube for supplying exhaust gas from a combustion engine; a cleaning water supply tube for supplying cleaning water; a scrubber for spraying cleaning water, which is supplied through the cleaning water supply tube, to exhaust gas supplied through the exhaust gas tube; an oxidation unit connected to the exhaust gas tube so as to oxidize the exhaust gas by discharging electricity, emitting ultraviolent rays, or spraying an oxidizer; and a cleaning water discharge tube for discharging cleaning water from inside the scrubber.

A liquid film dust arrester is installed to face a gas flow containing dust and flowing out from a gas discharge pipe. The arrester includes a gas flow blocking unit arranged vis--vis the gas flow, a liquid dispersion unit having a dispersion section arranged at a position near the center of the gas flow blocking unit and upstream relative to the gas flow blocking unit as viewed in the flowing direction of the gas flow so as to face the gas flow blocking unit, a liquid ejection unit having an ejection port disposed vis--vis the dispersion section and configured to eject liquid from the ejection port, and a liquid film forming unit. The dispersion section comprises a smooth surface that causes the ejected liquid to flow and disperse on the smooth surface, and the liquid film is formed to face the gas flow flowing through the flow path.

A method for processing a chemical stream includes contacting a feed stream with a catalyst in an upstream reactor section of a reactor having the upstream reactor section and a downstream reactor section, passing an intermediate product stream to the downstream reactor section, and introducing a riser quench fluid into the downstream reactor section, upstream reactor section, or transition section and into contact with the intermediate product stream and the catalyst to slow or stop the reaction. The method includes separating at least a portion of the catalyst from the product stream, passing the product stream to a product processing section, cooling the product stream, and separating a portion of the riser quench fluid from the product stream. The riser quench fluid separated from the product stream may be recycled back to the downstream reactor section, upstream reactor section, or transition section as the riser quench fluid.