After the explosion in a confined space aluminum aerosol particle size spectrum and its produce changes over time

Plutonium oxidation at different temperatures size particles varies with temperature . Generally produce plutonium wire explosion PM2.5 ( particle size less than 2.5μm) particles , the particle size for the safety assessment and environmental protection is important. Existing chemical nanoscale aluminum powder explosives and explosion in a confined space generated aerosol particle size spectrum and its changes over time for  2 way manifold  reports . Studies conducted in our laboratory showed that , despite the size spectrum with specific  Valve manifolds  vary, but nanoscale particle number concentrations are high. Agglomeration and sedimentation of collision and other reasons , the particle number concentration change with time approximately exponential decay law , " half-life " in the range of 30 ~ 90min . To avoid inhaling plutonium irradiation damage caused by  Stainless steel needle valve  plutonium experiments exhaust general subject of nuclear grade HEPA filter processing, in which plutonium concentrations below the national standard limit to emissions. Of radiation protection regulations , 239PuO2 derived air concentration 0.2Bq/m3. Currently, the widespread use of plutonium aerosol α continuous monitor for continuous online monitoring of plutonium aerosol , the principle is: membrane aerosol particles collected online , the emission of α particles with α detectors measure , according to the judgment particle energy spectrum nuclide composition and content .

With the continuous development of industrial technology, samples of materials have become increasingly demanding

In the blast furnace industry, in order to ensure the quality and efficiency of iron, scientific, rational and efficient use of materials into the furnace, steel companies into the furnace for all materials needed for real-time particle size measurement, and particle  5 way manifolds  results are accurate or not the key technologies one is that the level of sampling accuracy. With the continuous development of industrial technology, samples of materials have become increasingly demanding. However, at  Valve manifolds  our country there are few specialized sampling equipment, most of the iron and steel enterprises are manual sampling, sample representativeness poor, which directly affect the iron product quality. In order to  2 way manifold  and economic efficiency of enterprises, iron and steel enterprises need according to their own choice and design requirements suitable sampling device.

In selected siphon tube diameter and quantities, generally flow control

When the channel or channels with channel intersects with the road, and the two drains or water channels at the same level  Instrument valve manifolds almost the height of the aqueduct inconvenient to use, you can set the siphon tube. Inverted siphon arrangement, its axis shall be the intersection of the river, ditch, road perpendicular to narrow the length of the building; their embedment depth, the tube should be below the top  2 way manifold  riverbed scouring lines of at least 0.5m, or below the channel bottom, roads road 1.0m. In selected siphon tube diameter and number, generally at a flow rate control. Flow rate is too large, head loss increases, channels available head relative decrease; taking into account through a small flow, the flow rate is too small will not occur due to siltation.

Valve controlled protection system with high reliability and long-running sexual

Axial fan to blast valve as research object, the check valve controlled protection system , aimed at the check valve itself does not affect the work of the case , in the blast when the normal flow of ventilation ducts , improve valve valves, reducing valve head loss , improve blast furnace steel production . Valve controlled  2 way manifold  parts protection system using electromagnets and three-phase AC motor as the driving force to enhance the valves, electric control part adopts PLC as the main control device to control the movement of the mechanical structure ;  Instrument manifold  ​​redundant monitoring module , to improve the system reliability ; prepared using the graphical programming software remote monitoring program to facilitate the operator to operate the control system and view historical data ; serial communication and the use of CAN bus technology to connect PLC  Instrument valve manifold , redundant monitoring module and a remote monitoring system. Valve controlled protection system with high reliability and long-running nature , and has expansion capability. The greatest feature of this system is the mechanical moving parts with our own security, which can be electrically controlled in the case of partial failure of the check valve can still ensure the work ; Meanwhile , PLC and redundant monitoring module via two communication systems simultaneously, improving reliability ; preparation RMON program good user interface , making the system easier for the operator to accept.