Avtomatski sistem za generiranje ogljičnih aerosolov

BASTARDI, FRANC (author), Žemva, Andrej (mentor)

V okviru diplomskega dela smo razvili generator črnega ogljika za lažje in preprostejše testiranje inštrumentov, ki jih proizvaja podjetje Aerosol d.o.o.- Aethalometrov. Dosegli smo, da se vsi inštrumenti testirajo z velikim razponom koncentracij črnega ogljika, pri enakih pogojih, ne glede na zunanje vplive, možna pa je tudi regulacija količine izpusta ogljičnih aerosolov iz generatorja v testirno komoro. Generator za gorivo uporablja kerozin, ki v njem zagori. Z impulzno črpalko kapne generator na kvarčni filter kapljico kerozina z znanim volumnom, nato pa uporovna žica zaneti kerozin. Ob vžigu se takoj opazi črn dim, ki je viden indikator ogljičnih aerosolov. Ker gre za relativno nevaren sistem (odprti ogenj), ki se avtomatsko aktivira, je bilo potrebno poskrbeti za visoko stopnjo varnosti, kar sem dosegel s štirimi različnimi ločenimi varnostnimi sistemi (termostat z uporom NTC, krmiljen dovod kisika, programska oprema in zunanje varovalo). Za krmiljenje sem izbral Siemensov LOGO! krmilnik s pripadajočo programsko opremo LOGO! Soft Comfort. Krmilnik ima osem 12/24V vhodov ter 4 izhode, ki so zmožni krmiliti napetosti do 220 V in tokovnih obremenitev do 10 A.

• Language: Slovenian
• Keywords: generator črnega ogljika, Aethalometer, testirna komora, kerozin, NTC termostat, odprti ogenj, Siemens LOGO!
• Work type: Undergraduate thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2015
• PID: 20.500.12556/RUL-30551
• Publication date in RUL: 10.02.2015

Secondary language

• Language: English
• Title: Automatic system for black carbon generation

Abstract

The diploma work contains a description of a black carbon generator. The instrument was developed for easier and more effective testing the Aethalometer instruments, manufactured by Aerosol d.o.o. company. The black carbon generator enables us to control the BC concentration in our test chamber. All of the instruments are now tested with the same method and with wide range of BC concentrations, independently of outdoor influences. The instrument works by combusting kerosene. A drop of kerosene is pumped on a quartz filter, and then burned with a resistance wire. While burning, we can clearly see a large amount of black smoke, which is an indicator of a black carbon. We have implemented a fairly sophisticated safety system since the instrument presents a high risk (open flame). Four different seperate techniques were used: a NTC thermostat, controlled oxygen supply, software safety regulations and an external fire extinguisher. Siemens LOGO! controller, with the LOGO! Soft Comfort software to control the whole system was used. The Controller has 8 different 12/24V inputs and 4 outputs with maximum of 220 V and current of 10 A.

• Keywords: black carbon generator, Aeathalometer, test chamber, kerosene, NTC thermostat, open flame, Siemens LOGO!