An assembly that includes a particle collecting container and a cyclone pre-separator placed on the particle collecting container, where the particle collecting container has a rectangular container bottom and four container peripheral walls which extend upwards from the container bottom and define a horizontal outer contour of the particle collecting container, and where the cyclone pre-separator has a particle outlet which is designed to dispense particles which have been separated in the cyclone pre-separator into the particle collecting container. The horizontal outer contour defined by the container peripheral walls tapers towards the container bottom and the particle collecting container can be stacked into an identical particle collecting container.

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.

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.

An assembly that includes a particle collecting container and a cyclone pre-separator placed on the particle collecting container, where the particle collecting container has a rectangular container bottom and four container peripheral walls which extend upwards from the container bottom and define a horizontal outer contour of the particle collecting container, and where the cyclone pre-separator has a particle outlet which is designed to dispense particles which have been separated in the cyclone pre-separator into the particle collecting container. The horizontal outer contour defined by the container peripheral walls tapers towards the container bottom and the particle collecting container can he stacked into an identical particle collecting container.

A system for treating a fluid used for cleaning exhaust gas from pollutants including particulate matter comprises a circulation tank for accommodating the fluid, the circulation tank comprising an outlet for bleeding off part of the fluid. A first device is provided for adding a first chemical to the part of the fluid, wherein the first chemical comprises a coagulant. A separation device receives a mixture comprising the part of the fluid and the first chemical, and separates the mixture into a first fraction and a second fraction, which first fraction contains more particulate matter than the second fraction. A flocculation arrangement comprising a first flocculator device is arranged between the separation device and the first device to retain the part of the fluid and the first chemical to promote agglomeration of particulate matter comprised in the part of the fluid before the mixture is received by the separation device.

A multi-mechanism wet dust removal apparatus achieving water circulation use 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, and dust removal is achieved by dust collecting, dust settling, air-water separation and dust discharging. The multi-mechanism wet dust removal apparatus achieving water circulation use and the dust removal method integrate multiple dust removal mechanisms, and the dust removal efficiency and effect are obvious.

Provided is a wet cyclone apparatus including a body, an inlet installed in the body, and having a passage through which air including airborne particles is sucked in, a wet cyclone connected to the inlet to wet and collect the airborne particles introduced from the inlet, and a water storage installed in the body to store water, wherein the wet cyclone includes an air suction port into which the air introduced from the inlet is sucked, a water inlet through which water is supplied from the water storage, and a sample outlet through which the collected wetted sample is extracted and discharged.

The present disclosure relates to methodologies, systems, and devices for discretely collecting extracts from an extract collection container of a CO.sub.2-based extraction system. A removable liner can be placed within the extract collection container such that the extract is collected within the removable liner, which can be removed or collected at discrete times. The removable liner can be hung from an extract fluid inlet tube or attached to an internal sidewall of the extract collection container.

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.

A system and method for removing gas bubbles from fluid. An active filter apparatus forces the bubbles to the center of the filter, while a pump supplies fluid to the filter.