Pegasor Oy

Kvaerner Pulping Oy

Other

Wallac Oy

Dekati Oy

Environics Oy

Liekki Oy

Kauko Janka

Jorma Keskinen

Tuomo Ruohola

Erkka Saukko

Antti Rostedt

Matti Ylitalo

Markku Rajala

Mikko Moisio

Juha Tikkanen

Kimmo Pietarinen

Matti Putkiranta

Sampo Saari

Ari Laitinen

Katja Bengtsson

The invention relates to a method and an apparatus for measuring particle concentrations in an aerosol. The apparatus comprises means () for driving flow () into apparatus (), means () for electrically charging particles () to become electrically charged particles () by ions () produced by a charger, means () for removing free ions () which are not attached to the electrically charged particles (), and means () for measuring electrical current carried by the electrically charged particles (). The means () for charging the particles and the means () for measuring electrical current carried by the electrically charged particles () are dimensioned such that the means () for measuring electrical current carried by the electrically charged particles () only measures a part of a total current carried by the particles.

Method and apparatus for monitoring particles

The present invention relates to an apparatus () and process for measuring characteristics of a particle flow. The measuring is done with two different cut-off diameters of a particle trap () of which one cut-off diameter is adjusted based on the measured particle characteristics.

Apparatus and process for measuring characteristics of particle flow

The present invention relates to an apparatus () for particle measurement. The apparatus () comprising a mixing chamber () having a sample inlet (), an ionized gas outlet () for feeding ionized clean gas into the mixing chamber (), and a mixing chamber outlet () for discharging mixed sample aerosol formed in the mixing chamber (). The apparatus further comprises a sample channel () connected to the sample inlet () and extending in a first supply direction, a sample supply connection () arranged to supply sample aerosol to the sample channel () and a sample supply channel () connected to the sample supply connection () in a second supply direction transverse to the first supply direction. The sample supply connection () is arranged to supply the sample aerosol from the sample supply channel () to the sample channel () as a swirling sample aerosol flow.

Apparatus and method for particle measurement

The present invention relates to an apparatus () for monitoring particles in a channel () or a space comprising aerosol and to an ion trap arrangement in the apparatus. The apparatus () comprises an ejector (), gas supply () arranged to feed an essentially particle free ionized gas flow (C) to the ejector (), a sample-inlet arrangement () arranged to provide a sample aerosol flow (A) from the channel () into the ejector () by means of suction provided by the gas supply () and the ejector () for charging at least a fraction of the particles of the sample aerosol flow (A), and an ion trap () extending at least partly into ejector () for removing ions not attached to the particles. According to the invention the ion trap () is a provided as a metal trap wire.

Apparatus for monitoring particles in an aerosol

Apparatus () for generating acknowledged flow (Q), comprising a first passage () with ends () for acknowledged flow (Q) inlet and outlet, a discharge electrode () for generating airborne unipolar ions () positioned inside the first passage (), a counter electrode () adapted to attract said airborne ions (), thereby being adapted to cause a net flow () of airborne ions () and thereby generating an airflow (Q) in the direction of the net flow of airborne ions (), sensing element (), the output of which is a function of the concentration of the airborne electric charge (), means () for switching or modulating a parameter which affects the output of the sensing element () and means for determining the volumetric flow (Q) on the basis of the time response which switching or modulation creates to the sensing element () output.. Use of apparatus () as described in the previous claims for determining ultrafine particle concentration. Process for generating acknowledged flow.

Apparatus and process for producing acknowledged air flow and the use of such apparatus in measuring particle concentration in acknowledged air flow

A method for separating particles from particle-laden gas. Charged particles are formed by charging particles of a particle-laden gas. A gas jet is provided by guiding the particle-laden gas by a flow guide. Particles from the gas jet are collected to a collecting electrode by an electric field. An effective collecting area of the collecting electrode is positioned such that gas velocity gradient at each point of the effective collecting area is smaller than 10% of the maximum gas velocity in the gas jet divided by the height dimension of the jet.

Method and device for gas cleaning

The invention relates to a method for detecting biological material in an airstream, in which method the airstream is fed with the aid of sampling devices, a light beam is emitted towards the airstream, a fluorescence signal depicting the fluorescence of the particle is created, a scattering signal depicting the scattering of the light of the particle is created, the fluorescence signal and the scattering signal are converted into discrete values, and an alarm value is defined. The discrete values are recorded cumulatively as hit points in an at least 2-dimensional measurement space equipped with selected dimensions, at least one index area is preselected from the measurement space, a cumulative index is calculated at an index frequency from the hit points accumulated on the each preselected index area, and an alarm value, showing the presence of a selected biological material, is defined from the indices by using a preselected criterion.

Method and device for detecting biological material

A method for preparing doped oxide material, in which method substantially all the reactants forming the oxide material are brought to a vaporous reduced form in the gas phase and after this to react with each other in order to form oxide particles. The reactants in vaporous and reduced form are mixed together to a gas flow of reactants, which gas flow is further condensated fast in such a manner that substantially all the component parts of the reactants reach a supersaturated state substantially simultaneously by forming oxide particles in such a manner that there is no time to reach chemical phase balances.

Method for the preparation of doped oxide material

A method and a sensor device for determining particle emissions from exhaust gases of a combustion engine substantially during the use in an exhaust pipe system or a corresponding exhaust gas duct, in which method emitted particles contained in the exhaust gases are charged and the particle emissions are determined by measuring the electric charge carried by the emitted particles in the exhaust gas duct. The emitted particles are charged by varying the way of charging or the charging power with respect to time in such a manner that as a result of the charging, emitted particles brought into at least two different electrical charge states are present, wherein the charge of the emitted particles is further determined as a difference value/values measured from the emitted particles brought into said at least two different electrical charge states.

Method and a sensor device for measuring particle emissions from the exhaust gases of a combustion engine

A method and an arrangement for supplying air to a fluidized bed boiler are disclosed. In the method, the air is supplied from all comers of the fluidized bed boiler substantially parallel to two opposite walls and from the middle of said walls toward the center of the fluidized bed boiler whereby the air flows cause the formation of four vortexes in the fluidized bed boiler. The arrangement comprises nozzles that blow air jets towards each other parallel to the opposite walls of the fluidized bed boiler and nozzles in the middle of the walls arranged to blow air toward the center of the fluidized bed boiler.

Method and arrangement for supplying air to a fluidized bed boiler

A method and an arrangement for supplying air to a recovery boiler. In the method, the air is supplied to the recovery boiler at at least one air supply level so that four vortices are formed therein, the vortices spinning, in pairs, in opposite directions to one another so that any two adjacent vortices always spin in opposite directions to one another. The arrangement comprises nozzles that are arranged to blow air so that four vortices are formed in the recovery boiler, any two adjacent vortices always spinning in opposite directions to one another.

Method and arrangement for supplying air to recovery boiler

A method and apparatus for measuring the flow rate of gases comprises the placing of a small radioactive source material in the path of the gas flow, establishing an electrical potential between one electrode and two other electrodes disposed transversely of the gas flow path from the first electrode and in the direction of gas flow from each other, and comparing the currents generated between the electrodes as a function of the rate of gas flow.

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Tampere, Finland

Kauko Janka