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Author:Mäki, Johanna
Title:Kaasukombivoimalaitoksen höyryprosessin tehonkorotusmahdollisuudet
Steam process power increase possibilities in combined cycle power plant
Publication type:Master's thesis
Publication year:2013
Pages:56 s. + liitt. 11      Language:   fin
Department/School:Energiatekniikan laitos
Main subject:Energiatalous ja voimalaitostekniikka   (Ene-59)
Supervisor:Ahtila, Pekka
Instructor:Hanioja, Jyrki
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201609083482
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  5787   | Archive
Keywords:gas turbine
steam turbine
steam process
power increase
district heat
pressure reduction
kaasuturbiini
höyryturbiini
tehonkorotus
kaukolämpö
reduktioajo
Abstract (eng): This thesis is made for Helsingin Energia Vuosaari B power plant.
The purpose for this thesis is to study and model the combined cycle power plant and its steam process after power and efficiency increase of gas turbines.

It has been noted that steam process limits, when the steam flow is high while the power plant is at 100 % load.
Situations like these are examined with help of measurement data.
In addition, it is studied which equipment and operating values affect steam process limitation.

There are two options pointed out to solve the limitation problem and also to increase steam process power: re-dimensioning steam turbine high-pressure control valves or renewing district heat pressure reduction control valves.
The changes of heat and power production are calculated for these possibilities for the share of excess steam.
The costs of investments are estimated, and on the basis of all information viability calculations are made.

As a result of the calculations, it is primarily recommended to renew the district heat reduction valves.
Although both possibilities are profitable if prices of separate heat production and electricity is high.
Abstract (fin): Tämän diplomityön kohteena on Helsingin Energian Vuosaaren B-voimalaitos.
Työssä tutkitaan ja mallinnetaan kaasukombivoimalaitoksen ja sen höyryprosessin toimintaa kaasuturbiinien tehonkorotuksen ja hyötysuhteen noston jälkeen.

Höyryprosessin on havaittu rajoittavan suurilla höyryvirtauksilla laitoksen ollessa 100 % kuormalla.
Tämänkaltaiset rajoitustilanteet selvitetään laitoksen mittausdatan perusteella.
Lisäksi selvitetään laskennan avulla, mitkä laitteet ja toiminta-arvot vaikuttavat höyryprosessin läpäisyyn.

Selvityksen perusteella höyryprosessin läpäisyn ja tehon nostamiseksi esitetään kaksi vaihtoehtoa: höyryturbiinin korkeapainesäätöventtiileiden uudelleen mitoitus tai kaukolämpöreduktion säätöventtiileiden uusiminen.
Näille vaihtoehdoille lasketaan höyryprosessin lämpö- ja sähkötehon muutokset ylimäärähöyryn osalta.
Investoinneille arvioidaan kustannukset, ja tietojen pohjalta laaditaan molempien vaihtoehtojen kannattavuustarkastelu.

Diplomityön tuloksena suositellaan ensisijaisesti kaukosamporeduktion säätöventtiileiden uusimista, vaikka molempien vaihtoehtojen investoinnit kannattavat, jos erillistuotantolämmön ja sähkön hinta ovat korkealla.
ED:2013-10-16
INSSI record number: 47316
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