izpis_h1_title_alt

Avtomatizacija zmanjševanja emisij dušikovih oksidov pri proizvodnji klinkerja
PRINČIČ, TADEJ (Author), Nedeljković, David (Mentor) More about this mentor... This link opens in a new window

.pdfPDF - Presentation file, Download (8,18 MB)
MD5: 59B4F74614384305466C3BDB331034B5

Abstract
V magistrskem delu je opisan sistem za avtomatsko zmanjševanje emisij dušikovih oksidov (NOX) pri proizvodnji klinkerja, ki je osnovna surovina cementa. Mejna vrednost emisij NOX v zrak je predpisana v okoljevarstvenem dovoljenju [1], ki sledi zakonskim zahtevam in konceptu najboljših razpoložljivih tehnologij (BAT – angl. Best Available Technology) [2, 3, 4]. Zahteve za mejne vrednosti emisij snovi v zrak se z razvojem teh tehnologij znižujejo. Zavoljo spremenjene mejne vrednosti za dušikove okside [3] smo se odločili za uporabo ene od najboljših razpoložljivih tehnologij (BAT 19 in 20 za cementno industrijo) [2], in sicer za proces selektivne nekatalitske redukcije (SNCR), ki z uporabo sečnine (CH4N2O) zmanjšuje emisije NOX iz rotacijske peči za proizvodnjo klinkerja. Sistem za pripravo raztopine in njen vbrizg v predel izmenjevalnika toplote - kalcinator sta zasnovana tako, da delujeta popolnoma avtomatsko. Proces lahko delimo na dva dela, in sicer na pripravo raztopine po predhodno določenem postopku ter na vbrizg sečnine v kalcinator glede na potrebe procesa. Za av¬tomatizacijo procesa redukcije NOX smo nadgradili obstoječi krmilnik tipa Siemens S7-416-2DP in obstoječi nadzorni sistem iFix 5.8. V sistem smo dodali dve ločeni elektro omari s pripadajočimi vhodno/izhodnimi moduli, ki smo jih priklopili v že obstoječe Profibus omrežje. Odločili smo se za uporabo že obstoječega nadzornega sistema SCADA (angl. Supervisory Control And Data Acquisition) in programsko opremo iFix 5.8. Sistem SCADA omogoča, da prek krmilnika priključene naprave nadzorujemo in vodimo s komandnega pulta, torej na daljavo. Ravno tako oprema iFix 5.8 omogoča povezavo do krmilnika ter risanje grafičnega prikaza za nadzor in vodenje procesa ter shranjevanje in analizo vrednosti, ki jih pridobi iz naprav. Cilj magistrskega dela je izdelava avtomatsko vodenega sistema na računalniku za nadzor. Na virtualnem strežniku z bazo podatkov smo najprej namestili gonilnik za krmilnik. Krmilnik smo preko TCP/IP protokola povezali na strežnik, tega pa preko Ethernet mreže na fizične računalnike z grafičnimi prikazi. Virtualni strežnik omogoča shranjevanje podatkov, ki jih lahko prenašamo na druge strežnike. Strežniki, ki jih uporabljamo, so naslednji: za arhiviranje podatkov s programsko opremo Proficy Historian 7.0, terminal SCADA, ki omogoča vpogled v podatke ter njihovo analizo več uporabnikom, strežnik za bazo podatkov, kjer se podatki osvežujejo, in strežnik SQL (angl. Structured Query Language), ki povezuje vse naštete strežnike in beleži spremembe nastavitev konfiguracij, spremembe parametrov do katerih pride na vsakem od strežnikov, in računalnikov, ki so povezani nanj. Upravljalne računalnike za nadzor smo morali povezati z omenjenimi strežniki, saj se brez njih podatki ne bi prikazovali. Ko je bila vzpostavljena komunikacija med naštetimi strežniki, smo lahko začeli z ustvarjanjem grafičnega prikaza procesa vbrizgavanja sečnine. Običajno se proces zriše kot v elektro načrtu in kakor so dejansko naprave postavljene. Za lažjo realizacijo slike si pomagamo z orodjem iFix. Delovno okolje Workspace se uporablja za konstruiranje grafičnega prikaza z animacijami, VBA (angl. Visual Basic for Aplication) programski jezik omogoča, da lahko grafični element pošilja ukaz za spremembo na krmilniku ali spremembo na SCADA in Database Manager, ki upravlja s podatkovno bazo, povezano na virtualnem strežniku. Sistem je bilo potrebno postaviti dvakrat, saj je testiranje potekalo na testnem strežniku, šele nato pa se je zaradi testiranja med delovanjem proizvodnje prestavilo na produkcijskega. Emisije NOX v zrak so se s pomočjo SNCR po pričakovanjih zmanjšale tako, da so bile zagotovljene vrednosti pod 500 mg/Nm3. Avtomatski sistem deluje brezhibno, operaterji nimajo težav z vodenjem in upravljanjem, sistem pa je pregleden in uporaben tudi za tehnologe. Ker želimo bolj optimizirati delovanje sistema za zmanjševanje emisij NOX, že uvajamo nove izboljšave, tako da bomo regulirali pretok sečnine ter montirali dodatno razpršilno šobo.

Language:Slovenian
Keywords:SCADA, iFIX, SNCR, nadzorni sistem, avtomatsko vodenje
Work type:Master's thesis/paper (mb22)
Organization:FE - Faculty of Electrical Engineering
Year:2019
Views:454
Downloads:190
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Secondary language

Language:English
Title:Automation of Nitrogen Oxides Emission Reduction in Clinker Production
Abstract:
This master's thesis describes a system for the automated nitrogen oxide (NOx) emissions reduction during the production of clinker, the main raw material of cement. Air emissions upper limit values are determined by the environmental permit [1], which follows law demands and concepts of the Best Available Techniques (BAT) [2, 3, 4]. Demands for upper limit values of air emissions are getting lower along with the development of these technologies. Given the changed limit value for nitrogen oxides [3] we decided to utilise one of the best existing technologies (BAT 20 for cement industry) [2], the process of selective non-catalytic reduction (SNCR), which reduces the amount of NOx emitted from the rotary furnace by using urea (CH4N2O). The systems for preparing the solution and injecting it into the calciner are designed to operate automatically, without additional burden to the operator. The process is divided into two parts; the preparation of the solution according to recipe and the injection of the urea into the calcinator as the process demands. To automate the NOx reduction process, we updated the existing Siemens S7-416-2DP controller and its iFix 5.8 control system. Two independent cabinets with corresponding input/output modules were added to the system and connected to the existing profibus network. We decided to utilise the existing SCADA (Supervisory Control And Data Acquisition) control system and the iFix 5.8 software. The SCADA system allows for remote supervision and operation of connected devices from the command desk. In congruence, the iFix 5.8 software enables a link to the controller and the drawing of a graphic representation for control and supervision of the process, as well as storage and analysis of values accumulated from the devices. The aim of the thesis was to implement the automatically controlled system on the control computer. First, the controller driver was installed on a virtual database server. Using the TCP/IP protocol, the controller was connected to the server, which was linked through the ethernet network to physical computers with graphic display. The virtual server facilitates data storage and transfer to other servers. The servers used are the SCADA terminal for data archiving with the Proficy Historian 7.0 software, as it allows for data insight and analysis from multiple users; a database server on which data is refreshed; and the SQL (Structured Query Language) server, which connects the aforementioned servers and records all events across all servers and the computers connected to it. The physical computers intended for management must have all the aforementioned server connections configured, or the data will not be displayed. When the connection between the servers was established, we began to create the graphic display of the process of urea injection. Usually, the process is displayed like in an electrical plan and as the actual devices are positioned. To facilitate image realisation, we use the iFix tool. Designer tool Workspace is utilised to construct the graphic display with animation, the VBA (Visual Basic for Application) programming language enables the graphic display to be used as a command for alterations in either the controller or the SCADA and Database Manager, which operate with the database connected to the virtual server. The system had to be set up twice, since it was tested on the test server, and was only moved to the production server due to testing during operating production. As expected, the NOX emissions to the air have been reduced as expected by means of SNCR so that values under 500 mg/Nm3 were guaranteed. Automatic system works impeccably. The operators do not have problems with controlling and managing, while the system is also clear and useful to supervisors. We strive to optimise this system and reduce NOx emissions by initiating improvements, that is why we will regulate urea flow and install an additional spraying nozzle.

Keywords:SCADA, iFIX, SNCR, control system, automated control

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back