44 results about "Gravitational sedimentation" patented technology

Subject matter of the invention is the procedure and plant for industrial wastewater and/or drinking water treatment by means of electrochemical methods and advanced oxidation processes. The preparatory phase of gravitational sedimentation is followed by main treatment consisting of electrocoagulation, electrooxidation and electroflotation through action of metal electrode sets made of inox, steel and aluminium respectively, with parallel disinfection/oxidation with ozone, UV irradiation and ultrasonic treatment, as well as recirculation in the electromagnetic field. At the end of the main treatment, the mixture of floccule and water is subject to coagulation/flocculation by electrochemically generated steel and aluminium floccule with slow infusion of ozone. The next phase is separation of sediment from clean water which is discharged through sand and activated charcoal filters for the purpose of removal of light floating floccule in the collection tank. If required, the water is subject to oxidation with simultaneous action of UV irradiation and ozone for the purpose of final destruction of organic matter and ammonia, and potential residues of microbiological contamination.

In the washing process of the invention, the solid particles in a high-concentration zone, which is formed in a washing tank by a gravitational sedimentation of solid particles, are continuously washed by a counter-current contact with upward flow of a washing liquid which is fed from the bottom portion of the washing tank. With this process, the impurities in the solid particles are sufficiently removed by a simple apparatus. Since the used washing liquid can be recycled as the disperse medium for feeding the solid particles and as the washing liquid, the amount of used washing liquid to be discharged as the waste from the system is reduced.

The invention discloses a method and a device for preparing microballoons by bi-dispersible inverse suspension polymerization. The first dispersion is carried out in an agitating manner; the particle sizes of the microballoons are determined by the volume ratio of a water phase and an oil phase and the agitating speed; second dispersion is carried out by a gravity sedimentation method; adhesion generated by collision of the microballoons caused by agitation at middle and later periods of the reaction can be effectively avoided without adding a dispersing agent; and the instability of a reaction system is solved from the process and equipment.

The invention provides a biomass incineration tail gas treatment method. The biomass incineration tail gas treatment method mainly comprises the following steps: enabling biomass incineration tail gasto pass through a high-temperature region and melting ash residues; then enabling the biomass incineration tail gas to pass through a low-temperature region and condensing into a block; then carryingout gravitational sedimentation to remove large-particle ash residues; then carrying out heat exchange and cooling the temperature of the tail gas to 130 to 170 DEG C; then removing dust through a ceramic filter and a cloth bag to remove micron dust; treating the tail gas through a heat exchanger and reducing the temperature, so as to condense water steam into liquid-state water; then recycling the liquid-state water into a liquid storage tank; after drying residual water steam through a drying tank, raising the temperature of the tail has to 110 to 140 DEG C through heat exchange of a hearthand directly introducing the tail gas into a catalysis tank 1; taking carbon monoxide in the tail gas as a reducing agent and removing nitrogen oxide; then enabling the tail gas to pass through a catalysis tank 2; removing the residual carbon monoxide and volatile organic pollutants by utilizing excessive oxygen in the tail gas; after an instrument monitors that the tail gas is qualified, discharging the tail gas through an activated carbon security tank. The biomass incineration tail gas treatment method provided by the invention has the advantages of simple and feasible procedure and relatively low energy consumption and material consumption; the biomass incineration tail gas treatment method is especially suitable for biomass incineration tail gas treatment in a controlled ecological life-support system.

A vertical electrical dust collector integrating gravity and cyclone dust removal is provided. Cyclones in the dust collector are arranged in a first-level gravity sedimentation chamber, and the central axis of each cyclone is in a vertical-state arrangement; a dust-containing gas inlet of each cyclone is located in the first-level gravity sedimentation chamber, and the center line of each dust-containing gas inlet is parallel to an upper tube sheet of the cyclones; the center line of a separated gas outlet of the upper end of each cyclone is coincident with the central axis of each cyclone; the separated gas outlet of the upper end of each cyclone and a dedusting port of the lower end of each cyclone are both communicated with a second-level gravity sedimentation chamber. By improving a structure of a gravity cyclone dust collector, the device described in the invention changes the structure of the cyclones and allows the dust-containing gas inlets of the cyclones to be parallel to the upper tube sheet of the cyclones, in the case, the center line and the central axis of the dust-containing gas inlet of each cyclone form an included angle which is an acute angle, a screw pitch of dust in the cyclones is small, the friction is mall, and the individual working efficiency of the mounted cyclones is improved with the connection way.

The invention discloses a method and device for detecting fine dust electrical agglomeration. Through gravity settlement characteristics of aerosol particles, mass distribution and a particle size distribution rule of dust subjected to electrical agglomeration in a settling chamber of the device under the action of gravity and gas flows are tested. Several slide glasses arranged on a settlement plate is used as sampling units, when charged and agglomerate dust of dust-containing gas flows going through a charged electrode is blown into the settlement chamber, under the action of gravity, the dust is settled on the slide glasses arranged along a gas flow direction so that a sampling process is finished. The slide glasses are taken and weighed so that dust mass distribution of all settling sections is obtained. Through granularity analysis based on a biological microscope, particle size distribution of the settling sections is obtained. Based on charged performances of dust, through a contrast test after change of electric field intensity and frequency alternation, mass distribution and particle size distribution are tested and effects of electric field intensity and alternate frequency on dust electrical agglomeration are determined.

The invention discloses a dust removing device of a protective self-propelled straw granulator. The dust removing device comprises a straw channel, and the head end of the straw channel communicates with a cutting device of the protective self-propelled straw granulator. The tail end of the straw channel is inclined upwards and communicates with the inner wall of the top of a diffusion area. The bottom inner wall of the diffusion area communicates with one end of a gravity slope, and the other end of the gravity slope communicates with a straw granulator feeding port of the protective self-propelled straw granulator. The bottom of the diffusion area communicates with the top end of a deceleration area through a dust removing filtering screen, and the bottom end of the deceleration area communicates with a dust discharging channel. According to the dust removing device, based on the gravity sedimentation theory, the incoming speed of straw is reduced through the diffusion area, and thestraw passes through a gravity channel and slides into the feeding port through mass differences and the gravity action; and raising dust low in mass and small in particle passes through the dust removing filtering screen, enters the deceleration area, and is discharged to the ground.