Device for measuring humidity

 

Usage: in the nuclear industry. The inventive device comprises a hopper drive, equipped with meters of the upper and lower levels, made in the form of two sources and two detectors of ionizing radiation, United with a unit acquisition and processing of the data source and the neutron detector, block multifunctional conversion, unit accumulation and processing of data, connected in series, and the hopper drive is made with an auger discharge, through which the transport container is connected with an electronic scale, and the control system consists of a drive unloading auger and industrial computer, which is electrically connected to the collection unit and the data processing and electronic scales. The technical result is the enhancement of nuclear safety and measurement accuracy. 1 Il.

The present invention relates to the nuclear industry and is designed to measure the moisture content of the powder of uranium dioxide with a small enrichment in its production.

The known device and method for measuring tocritical for U.S. patent No. 4.515 749, IPC G 21 017/00, 1985, containing two measuring channels, Oder channel registers the total flux of heat and nadalovih neutrons, as an indicator of the mass of material inspected and concentration of moderator (water), and then computing device determines the degree of tocritical mass humidity

The disadvantage of this device is an indirect determination of the density of material inspected and, consequently, high measurement error.

The closest in technical essence and the achieved result is a prototype that is moisture meter “FIELD-2”, (see Century, Novels. “Calibration of moisture meters solids”. Publishing standards, M, 1983, page 108) containing a source of fast neutrons and a detector of slow, a signal which is proportional to the moisture content of a substance.

This meter measures the volumetric moisture content and has a large error in the measurement of the mass of moisture, and to ensure nuclear safety in the production of powder of uranium dioxide it is necessary to know the percentage of the mass of water to mass of powder (mass humidity wt.%).

Since the bulk density of the powder may vary within ±50%, the measurement error can be ±30%.

In addition, to determine conditionnot powder it is necessary to measure the mass humidity with a relative error n the cha is solved by the device for measuring the moisture containing bunker drive, equipped with meters of the upper and lower levels, made in the form of two sources and two detectors of ionizing radiation, United with a unit acquisition and processing of the data source and the neutron detector, block multifunctional conversion, unit accumulation and processing of data, connected in series, according to the formula of the invention, the device is equipped with electronic scales, shipping container, the control system and the hopper drive is made with an auger discharge, through which the transport container is connected with an electronic scale, and the control system consists of a drive unloading auger and industrial computer which is electrically connected to the collection unit and the data processing and electronic scales.

This set of features is a new, unknown in the prior art and allows to solve tasks as mass humidity Wmpowder is determined from direct measurement of volumetric moisture content Wvthrough neutron channel and direct measurement of the mass m of the powder in the measured volume VBhopper by means of electronic scales. This Isen height hopper meters of the upper and lower level, the status signals which through the power of accumulation and processing of data transmitted in the industrial computer, managing portions unloading powder from a hopper drive, electronic scales through auger unloading and replacement of the transport container. Industrial computer receives the result of measurement of volumetric moisture content Wvfor a nominal density of pnfrom the collection unit and data and results of the measurement of the mass m of powder from electronic scales and, considering the transport delay in the volume of the screw, and calculates the mass of moisture by the formula: Wm=WvpnVB/m.

In addition, the communication lines between the industrial PC and block the accumulation and processing of information in real time is continuously monitoring the health of the neutron channel and a control system that increases the reliability in ensuring nuclear safety.

Thus, the implementation of the invention provides a new technical result consists in the direct measurement of the mass of the moisture content of the powder of uranium dioxide at a constant self-test health neutron measurement channel and the control system.

The drawing shows schema, equipped with 2 sources and detectors 3 gamma radiation meters of the upper and lower level, the fast neutron source 4 and the detection unit 5 neutron measuring channel block multifunctional conversion 6 neutron measuring channel unit accumulation and data processing 7 made based on industrial PC with blocks counters and blocks input/output discrete signals, the actuator 8 and the industrial computer 9 of the control system, unloading auger 10, the transport container 11, electronic scales 12, the secure container 13.

Device for humidity measurement works as follows.

In the production process, the storage hopper 1 is filled with a powder of uranium dioxide up to the trip meter top level, and then block the accumulation and processing of data 7 registration begins counting rate of pulses received from the detection unit 5 via the conversion unit multi-function 6 to the input of the pulse counter unit 7. The count rate of the neutron pulses of the measuring channel is proportional to volumetric moisture content Wvpowder is loaded into the storage hopper 1. Then the device acquisition and processing of data the data signal passes the volumetric moisture content at the entrance of the industrial computer 9, Industrial computer 9 reads the volumetric moisture content and the input discrete signal passes its value to the input device acquisition and processing of data 7 for checking. Then industrial computer 9 reads the weight value of P1transport container 11 from the output of electronic scales 12 and through the actuator 8 includes a rotating auger discharge 10. Unloaded to the powder in the transport container 11 mounted on the electronic scales. During unloading of the industrial computer 9 requests information on the status of the meter lower level line input discrete signals from the power accumulation and processing of data 7 and, at the time of actuation of the meter of the lower level, the discharge is terminated. Then industrial computer 9 reads the weight value of P2transport container 11 from the output of electronic scales 12 and calculates the weight loaded into a transport container 11 servings of powder m=P2-P1. The mass value t and volumetric moisture Wv including transportation delays industrial computer 9 calculates the value of the mass of moisture loaded portion of the powder Wm=WvpnVB/m and the average mass of moisture then the load and calculate the mass of moisture repeated.

If the value of the volumetric moisture content Wvexceeds the threshold of nuclear safety, industrial computer 9 through the actuator 8 includes reversing the direction of rotation of millet 10 and unloads the powder in a secure container 13.

In cycles of transmission and reception of information is a constant mutual performance monitoring neutron measurement channel and industrial computer time communication session and the code on lines I/o discrete signals.

Claims

Device for measuring the moisture containing bunker drive, equipped with meters of the upper and lower levels, made in the form of two sources and two detectors of ionizing radiation, United with a unit acquisition and processing of the data source and the neutron detector, block multifunctional conversion, unit accumulation and processing of data, connected in series, characterized in that the device is equipped with electronic scales, shipping container, the control system and the hopper drive is made with an auger discharge, through which the transport container is connected with an electronic scale, and the control system consists of electropathy data and electronic scales.



 

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