A mixing device includes a mixing cavity having a partially open wall and a closed wall. In certain examples, the partially open wall and the closed wall are two separately formed pieces. A downstream side of the mixing device is shaped so as to define a helicoidal groove for circumferentially guiding gas from an outlet opening of the mixing cavity in a downstream direction. An injector sprays reactant into the mixing cavity.

A long-effect self-cleaning negative-pressure ejector at least comprises a suction chamber, a jet pipe and a flushing member. A side wall of the suction chamber has at least one suction port for communicating with a first fluid pipeline. An exit port of the jet pipe is disposed in the suction chamber and ejects a second fluid so that a negative pressure is generated in the suction chamber, a first fluid in the first fluid pipeline obliquely enters the suction chamber, and a first included angle is between a direction in which the first fluid being sucked into the suction chamber and an ejection direction of the second fluid. The flushing member optionally provides a third fluid to flush the suction chamber and/or the first fluid pipeline. At least one air jet nozzle is disposed on the first fluid pipeline to inject gas into the first fluid pipeline.

An atmospheric water generation system comprises water vapor consolidation systems configured to increase the relative humidity of a controlled air stream prior to condensing water from the controlled air stream. The water vapor consolidation system comprises a fluid-desiccant flow system configured to decrease the temperature of the desiccant to encourage water vapor to be absorbed by the desiccant from an atmospheric air flow. The desiccant flow is then heated to encourage water vapor evaporation from the desiccant flow into a controlled air stream that circulates within the system. The humidity of the controlled air stream is thereby increased above the relative humidity of the atmospheric air to facilitate condensation of the water vapor into usable liquid water.

Disclosed herein is a humidifier including an improved structure of a water collection tank. The humidifier includes a main body, a water supply tank provided in an upper portion of the main body, a humidifying fabric arranged in an inside of the main body and disposed below the water supply tank to receive water, a fan configured to move air through the humidifying fabric, a water collection tank configured to collect water from the humidifying fabric, a pump configured to pump water from the water collection tank to the water supply tank, and a humidifier lower cover coupleable to and decoupleable from a lower end of the main body. The water collection tank includes a water collection tank top cover provided in an upper portion of the water collection tank, and a water collection tank lower cover configured to be accessible through the lower end of the main body.

An exhaust aftertreatment system for an internal combustion engine includes an outer casing defining an exhaust flow path for exhaust gases from the internal combustion engine, a selective catalytic reduction unit provided in the exhaust flow path for reducing nitrogen oxides, a urea dosing device for adding urea to the exhaust flow upstream of the selective catalytic reduction unit, and a rotatable mixer device for mixing the urea with exhaust gases upstream of the selective catalytic reduction unit. The exhaust aftertreatment system further comprises an air inlet valve provided upstream of the mixer device for introducing air into the exhaust flow path, and an electric motor arranged for rotating the mixer device to create a suction of air into the exhaust flow path via the air inlet valve.

An exhaust aftertreatment system for an internal combustion engine includes an outer casing defining an exhaust flow path for exhaust gases from the internal combustion engine, a selective catalytic reduction unit provided in the exhaust flow path for reducing nitrogen oxides, a urea dosing device for adding urea to the exhaust flow upstream of the selective catalytic reduction unit, and a rotatable mixer device for mixing the urea with exhaust gases upstream of the selective catalytic reduction unit. The exhaust aftertreatment system further comprises an air inlet valve provided upstream of the mixer device for introducing air into the exhaust flow path, and an electric motor arranged for rotating the mixer device to create a suction of air into the exhaust flow path via the air inlet valve.

The description relates to methods and apparatus that enable the efficient introduction of gases like air, oxygen and ozone into aqueous liquids. Gases are introduced into liquids for making that gas chemically or biologically available at a minimum energy expenditure. Impinging jets of liquid are directed into a pressurized saturation vessel having a gas-filled headspace and a saturation zone below the surface of the liquid at a velocity sufficient to create a turbulent impact and plunge zone. The resulting turbulence and mixing of gas and liquid in that zone under pressure, causes the gas to be driven into the liquid in the vessel and breaks up the gas and the liquid into a churning flow and creates a large number of bubbles. The resulting gas-enriched liquid is discharged from the vessel at an outlet to ensure a minimum of bubbles in the gas-enriched liquid.

There is provided an ammonia gas removal system, including a fine bubble generation device which is configured to receive at least a portion of scrubber process water from a storage tank, and to generate fine bubbles containing carbon dioxide gas in the received scrubber process water, the storage tank being configured to store the scrubber process water to be provided to a gas scrubber, the gas scrubber being configured to spray the process water onto ammonia-containing gas.

A scent delivery system includes a housing that releases a volatile substance from a porous body into the air. The housing may be part of a scent dispersion device that includes volatilization as directed by a fan and a controller within the housing.

A humidifier obtains, based on detection values of a first and second temperature and humidity sensors, the amount of humidification, the amount of water evaporated by a humidifying material per preset time, controls the amount of water supplied by a water supply unit per the preset time to be smaller than a specific value when the amount of humidification obtained at the present time is increased compared to the amount of humidification obtained at the previous time, and controls the amount of water supplied by the water supply unit per the preset time to be equal to or greater than the specific value when the amount of humidification obtained at the present time is decreased compared to the amount of humidification obtained at the previous time or when the amount of humidification obtained at the present time is equal to the amount of humidification obtained at the previous time.